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After its founding in 1970, ROLLVIS SA soon began to focus on the manufactureand marketing of satellite roller screws under the trademark « Rollvis swiss ».
Now a benchmark in this highly specialised field, ROLLVIS SA has investedin the most powerful machines for the production of screws with low tolerancemargins designed to individual specifications.
A fast-growing company with a young and highly qualified workforce, ROLLVIS SA recently moved into new ultra-modern premises near to Geneva.
It is structured to preserve its human scale and its capacity to listen and adaptperfectly to its customers’ requirements.
Three decades and more of skills and experience combined with the latesthigh-end techniques ensure its products comply with the most stringent anddemanding standards, notably in the following applications:
To ensure its satellite roller screws always gain by the latest progress in technologyto make them ever more reliable, ROLLVIS SA has set up its own « Researchand Development » department where its highly qualified engineers andtechnicians use the most recent and most powerful design software availablein their unceasing quest for the control of avant-garde technologies. New processes are constantly reviewed to optimise the product, productionsystem, quality control, tests and trials for individual requirements.
Even the most exacting customers swear by the outstanding reliability andquality of ROLLVIS products.
Present on all the continents, over time ROLLVIS SA has built up an excellentsales network, so that wherever you are in the world, there are experts to giveyou answers and advice.
Who is ROLLVIS ?
aeronautics, space
defence, car industry
moulding, injection(plastics and metal)
optical, graphics
special machine tools
medical
electrical cylinders
measuring machinesand laser machines
robotics, chemicals,
and all other fields of high technology
- 1 -
Introduction - Satellite roller screws compared to ball screws 2
Types of roller screws 3 and 4
Identification system 5
Accuracy - Efficiency 6
Geometry 7
Preloading 8
Preloading examples 9
Mean speed and axial load 10
Nominal lifespan 11
Rigidity 12
Rotation speed 13
Driving torque 14 and 15
Calculation example 16 and 17
Lubrication 18 and 19
Handling advice 20 and 21
Type RV ........ diameters of 3.5 to 12 22
Type RV ......... diameters of 15 to 23 23
Type RV ......... diameters of 25 to 36 24
Type RV ......... diameters of 39 to 48 25
Type RV ......... diameters of 51 to 75 26
Type RV ...... diameters of 80 to 150 27
Type BRV ......... diameters of 8 to 44 28
Type RVR ...... diameters of 8 to 125 29
Applications 30 to 32
contents
Preference program
No liability can be accepted for any errors or omissions. We reserve the right to make changes in the interest of technical progress.
- 2 -
ROLLVIS satellite roller screws are used to transform rotary movementsinto linear movements and vice versa. The bearing elements are threaded rollers between the screw and the nut. The high number of points of contactenables satellite roller screws to support very heavy loads.
The ROLLVIS manufacturing programme comprises satellite roller screwswithout roller recycling (types RV and BRV) and with roller recycling (type RVR),in a range of accuracy classes.
The ROLLVIS range also includes other types such as the reverse roller screw(type RVI) and the differential screw (type RVD).
Introduction
Satellite roller screws compared to ball screws
The satellite roller screw is similar to the ball screw with the differencethat the load transfer elements are threaded rollers.
The main advantage of satellite roller screws is that they have a highnumber of points of contact to support the load.
Load capacity and lifespanThe main advantage of roller screws compared to ball screws is that theiradmissible static and dynamic load capacities are higher.
The bearing function is ensured by threaded rollers instead of balls andthe load is spread over a higher number of points of contact.
Satellite roller screws like ball screws use Hertz’s law.The admissible Hertz pressure is the same for satellite roller screws andball screws. Satellite roller screws thus have a static load 3 times greaterthan that of ball screws and their lifespan is 15 times longer.
Speed & accelerationSatellite roller screws can rotate much faster and support much greateracceleration.
RV and BRV satellite roller screws are designed so that the rollers are notrecycled. This means the mechanism can support twice the rotation speedof a ball screw. Acceleration can reach up to 3g.
Lead & pitchPlanetary roller screw can be achieved with smaller leads comparedto ball screws.As the lead is a function of the pitch of the planetary roller screw, the leadcan be very small (0.5mm and even less).Planetary roller screws can be achieved with entire or real numbers (i.e. lead of 3.32mm per revolution), which avoid reduction gears. This is an advantage compared to ball screws. The lead can be chosen andrealised without any geometrical changes of both the screw shaft and thenut body, which allows updates with minor changes.In a ball screw the lead is limited by the dimension (OD) of the bearingball, which is a standard feature.
Rigidity & strengthThe many points of contact give a satellite roller screw greater rigidity andshock tolerance than a ball screw.
- 3 -
Types of roller screws
RVR satellite roller screws have very fine threads and are used whenvery great positioning accuracy is required along with high rigidity andload-carrying capacity.
The main elements of RVR satellite roller screws are the screw, the nutand the rollers which are guided and maintained at the correct distancein a cage.
The screw has a single- or two-start thread with a triangular profile. Theangle between the flanks is 90°. The nut has the same internal thread asthe screw. The rollers are not threaded but have grooves perpendicular
to the screw axis. The distance between the grooves matches the exposedthread of the screw and nut. The flanks are convex and the angle between them is 90°.
When the screw or nut rotates, the rollers are axially displaced in the nut.After a complete revolution, each roller is returned to its initial position bytwo cams at the end of each nut. They can be recycled this way becausethere is a groove the length of the nut.
The cage pockets are slightly longer than the rollers to enable them to move axially within the nut.
RVR screws
The main elements of RV and BRV satellite roller screws are thescrew, the nut and satellite rollers.
The screw has a multiple-start thread. The angle between the flanks is90° and the profile is triangular. The nut has an internal thread identicalto that of the screw. The rollers have a single-start thread with an anglethe same as that of the nut. This ensures there is no axial movement between the nut and the rollers. The rollers do not therefore need to be recycled.
The flanks of the roller thread are convex. At each end of the rollers thereis a cylindrical pivot and gear teeth. The pivots are mounted in the holesof the end rings, thus ensuring the rollers are equidistant. The end ringsare floated in the nut body and axially secured with circlips.
The gear teeth engage in gear wheels fixed in the nut. This guides therollers parallel to the axis to ensure perfect functioning.
RV and BRV screws
RV and
BRV
RVR
- 4 -
Types of roller screws (ctd.)
RVI satellite roller screws work on the same principle as RV and BRV screws except that theirnut system is reversed.
This means the rollers themselves rotate around the screw (instead of the nut in RV and BRVscrews) and move axially within the nut.
Apart from the screw threading where the rollers orbit, the journal is smooth and can have a specialshape (e.g.: antirotation).
The nut is threaded along its entire length and is much longer than on RV and BRV screws. It governs the overall travel of the complete screw and therefore limits it if needed.
RVI screws
The RVD differential screw is actually a variant of the RV and BRV screws.
Its components, expertly calculated and adjusted, are used to produce extremely fine threads(less than 0.02 mm).
The movement of the rollers in this somewhat complex mechanism does however prevent a wide range of travel.
The nuts are larger than on the RV and BRV types.
RVD screws
RVI
- 5 -
Identification system
RV 210 / 30. 5. R3. 6-- ---
Design RV = ground thread, non-recycling rollersBRV = rolled thread, non-recycling rollersRVR = ground thread, recycling rollersRVI = ground thread – reverse systemRVD = ground thread – differential screw
Nut types 1 = single nut2 = split nut3 = double nut
Seal 0 = without wipers1 = with wipers
Thread direction R = rightB = right/leftL = left
Thread accuracy G1 = 6 µm/300 mmG3 = 12 µm/300 mmG5 = 23 µm/300 mmG9 = 200 µm/1000 mm (BRV only)
Screw diameter d0 in mm
Nominal lead P in mm
6-digit number to identify customer’s specification
Nut design 1 = cylindrical nut6 = nut with flange at one end7 = nut with central flange8 = special nut design
Example
- 6 -
Accuracy
Efficiency
AdvantagesHigh axial load capacityLong lifespanHigh efficiencyNo backlashExtremely high rigidity
Accuracy greater than 6 µm/300 mmHigh rotation speed (RV and BRV systems)Small leads (from 0.25 mm)with wide diameters (system RVR)Fast acceleration and deceleration
Rollvis satellite roller screws achieve high rates of mechanical efficiency. The figure opposite shows efficiency rates η1 for the ascent and η2 for the descent,according to the helix angle. The efficiency of a trapezoidal thread screw is shownfor comparison. Satellite roller screws, unlike friction screws, are not self-locking.
Machine toolsMeasuring machinesSpecific machines (benders)RoboticsAeronautics (aeroplanes and helicopters)Space (rockets and satellites)
Defence (tanks, cannons, missiles, etc.)Oil industryNuclear industryMedicalChemical industryOptical
TelescopesGraphicsLaser machinesInjection moulding machinesCar industry
Positioning satellite roller screws are supplied in tolerance classes G1, G3and G5 and transport satellite roller screws (type BRV) in tolerance class G9.
Satellite roller screws are divided into tolerance classes based on DIN69051, part 3 (ball screws). The determining factor is the lead error V300p
referred to a thread length of 300 mm.
The table oppositeshows the tolerance classes:
Tolerance Cl
G1G3G5G9
V300p
6 µm/300 mm
12 µm/300 mm
23 µm/300 mm
200 µm/1000 mm
Lead errorThe lead error ep relative to effective travel Lu is calculated for the transportsatellite roller screw by the following formula:
Lead errors ep for positioning satellite roller screws are shown in the tableopposite. For tolerance classes G1 and G3, the lead and torque diagramsare supplied with the screws.
Lead is checked by a 3D measuring machine or on a measuring benchequipped with a laser interferometer.
ep = 2 . Lu . V300p1000
more than
315 mm400 mm500 mm630 mm800 mm1000 mm1250 mm1600 mm2000 mm2500 mm
315 mm400 mm500 mm630 mm800 mm1000 mm1250 mm1600 mm2000 mm2500 mm3150 mm
G1 G3 G5
LuEp in microns
for tolerance class up to
678910111315
1213151618212429
2325273035404654657793
Lead accuracy symbols according to DIN 69051/3
P nominal lead
e0 difference between required lead and nominal lead
V300p difference between actual and nominal lead over 300 mm
ep difference between actual and nominal lead over a length Lu
Vup travel variation over a length Lu
V2πp travel variation over one revolution
Lu effective travel
ApplicationsRollvis satellite roller screws have proved their superior worth in many fields of applications such as:
100
90
80
70
60
50
40
30
20
10
1 2 3 4 5 6 7 8 9 10
η1
η2
Satellite roller screw
Trapezoidal thread screw
Effic
ienc
y in
%
Helix angle ϕ in deg.
- 7 -
Geometry
Nut geometry and shape
SINGLE NUTS
• Nuts in one piece with axial backlash
• Wipers (if requested by the customer)
SPLIT NUTS:• Nuts in two pieces, preloaded,
without backlash• Same dimensions as single nuts• Reduced load capacities• Wipers
(if requested by the customer)
DOUBLE NUTS:• Two single nuts, preloaded,
without backlash• Same load capacities as single nuts• About twice as long as single nuts• Wipers
(if requested by the customer)
Shape A Shape B
60° 60°45° 30°
FLANGE SHAPES
Standard satellite roller screws are available with 3 nut designs:• single nut (ES)• split nut (EF)• double nut (ED)
Single nuts have low axial backlash of 0.01 to 0.03 mm. The split cylindrical nut is preloaded by clamping the two halves of the nut in a housing. A precision spacer ring is mounted between the two halves to maintainthe required level of preloading. Split nuts with a flange at one end have a spacer ring designed to hold thehalves apart. The halves are aligned by a parallel key. Double nuts are preloaded in the same way as split nuts.
- 8 -
Preloaded nuts are used to eliminate backlash and increase rigidity.
Preloading should be carefully calculated to achieve the highest rate of efficiency and thelongest possible lifespan (see figure above).
For preloaded nuts, in addition to the individual loads F1…Fn, preload Fv must also be taken into account to determine the mean load Fm. This yields new individual loads F1v…Fnv.
If for example an absence of backlash is required for all operational loads, preload Fv mustbe selected according to the maximum load Fmax.
If a satellite roller screw only needs to be backlash-free for a specific load, preload Fv
should be selected according to the corresponding load Fn.
Resulting load depending on preload Fv
An axial load on a preloaded nut system increases the load of one of the halves and relieves the other fromthe preloading force. The resulting load can be estimatedby the following equations:
Loaded half of nut:
Fnv(1) = Fv + 0.65 . Fn [N] if Fn < 2.83 . Fv [N]Fnv(1) = Fn [N] if Fn ≥ 2.83 . Fv [N]
Relieved half of nut:
Fnv(2) = Fv - 0.35 . Fn [N] if Fn < 2.83 . Fv [N]Fnv(2) = 0 [N] if Fn ≥ 2.83 . Fv [N]
Unless the customer otherwise requests, split and double nuts are preloaded in the standardversion to a maximum of 5% of the dynamic load capacity.
Fv =Fmax [N]2.83
Fv = Fn [N]2.83
Preloading
F1…Fn [N] : individual loadsFv [N] : preloading forceFnv [N] : load resulting from the individual load and preloadingFma [N] : mean load taking into account preloading
F1
FV
F2
- 9 -
Preloading examples
Flange nut Cylindrical nut
Preloading with rigid spacer (thickness calibrated by Rollvis SA)
Flange nut Cylindrical nut
Preloading with elastic washers
Elastic washers
- 10 -
Mean speed and axial load
For variable speed and load, lifespan should be calculated with meanvalues nm and Fm.
For variable speed and constant load with speed n, the mean speednm is used (figure below).
For a variable load at constant speed, the mean load Fm is used (figure below).
For a variable load at variable speed, the mean load Fm is used.
nm =q1 .n1 + q2 .n2 + …[min-1]
100 100
Fm = F13. q1 + F2
3. q2 + …[N]
100 100
3
Fm = F13. q1 . n1 + F2
3. q2 . n2 + …[N]
100 nm 100 nm
3
For a variable linear load at constant speed, the mean load Fm is used(figure below).
Fm =Fmin + 2 . Fmax [N]
3
nm [min-1] : mean speed n1…nn [min-1] : individual speedsq1…qn [%] : time percentageFm [N] : mean loadF ; F1…Fn ; Fmin; Fmax [N] : actual forces
- 11 -
Nominal lifespan
The nominal lifespan L10 or Lh of a satellite roller screw is attained with a probability of 90%.
If greater reliability is required, the nominal lifespan L10 or Lh must be multiplied by the reliability factor fr(table opposite).
Modified lifespan Ln = L10 . fr [revolutions]
or Lhn = Lh . fr [h]
Reliability %
909596979899
fr
10.620.530.440.330.21
Nominal lifespan of single nuts (with backlash)
The nominal lifespan of single nuts is calculated by the following formula:
or
L10 = (C )3.106 [revolutions]
fm
Lh =L10 [h]
nm . 60
If the lifespan is predetermined, the dynamic load capacity is calculated as follows: C = Fm . L10 [N]106
3
The lifespan in actual hours LhN is calculated by the following formula:
FN = Lifespan of satellite roller screwsExpected lifespan of the machine
The utilisation factor fN is calculated as follows:
LhN =Lh [h]fN
Ln [revolutions] : modified lifespan (revolutions)Lhn [h] : modified lifespan (hours)L10 [revolutions] : nominal lifespan (revolutions)Lh [h] : nominal lifespan (hours)LhN [h] : lifetime in actual hoursfr [-] : reliability factor
C [N] : dynamic load capacityFm [N] : mean load (single nut with backlash)Fma [N] : mean load (preloaded nut)nm [min-1] : mean speedfN [-] : utilisation factor
L10(1) = ( C )3.106 [revolutions]
Nominal lifespan of preloaded nutsFor preloaded nuts, it is first necessary to calculate the lifespan of each half of the nutwith the corresponding dynamic load capacity C and the mean axial load Fma
(including preload). The total lifespan L10 of the preloaded nut is obtained with the two lifespan values L10(1) and L10(2) (in revolutions).
Fma(1)
L10(2) = ( C )3.106 [revolutions]
Fma(2)
L10 = (L10(1)-10/9 + L10(2)
-10/9)-9/10
[revolutions]
- 12 -
Rigidity
Case 1 : fkn = 0.25 Case 3 : fkn = 2.0
Case 2 : fkn = 1.0 Case 4 : fkn = 4.0
Satellite roller screw rigidityThe overall rigidity Cges of a satellite roller screw is made up of thefollowing individual rigidity values:Cme nut rigidityCSp screw rigidity
CL bearing rigidityCu rigidity of the surrounding
construction
Nut rigidity Cme
The rigidity Cme of a complete satellite roller screw nut can be approximatedwith the following formula:
Cme = fm . fK . Fn1/3 [N/µm]
fm for single nut ES = 0.75fm for split nut EF = 1fm for double nut ED = 1.5
The following condition is set for Fn for the Cme values shown in thetable for standard preloading:
Fn = 2.83 . FV [N]
Nut rigidity CS
Nut rigidity CS can be determined by the following simplified formula:
CS = 164 . d02
[N/µm]L
Permissible buckling force Fknzul at rotation speed n = 0Permissible buckling force can be calculated by the following formula:
Fknzul = 0.8 . 101.6 . fkn . d04
[kN]L2
Fv [N] : preloading forceFn [N] : axial loadCme [N/µm] : nut rigidityCs [N/µm] : screw rigidity fk [N2/3/µm] : rigidity factor
fm [-] : correction factorL [mm] : free screw lengthd0 [mm] : nominal diameter of screwFknzul [N] : permissible buckling force fkn [-] : correction factor for bearing type
- 13 -
Rotation speed
Case 1 : fkr = 0,32 Case 3 : fkr = 1,55
Case 2 : fkr = 1,0 Case 4 : fkr = 2,24
Permissible rotation speed and axial load Satellite roller screws are restricted by the inter-nal configuration of the nut, the bearings at theend of the screw and the critical number of revo-lutions nkr due to flexural vibration.
The value of the permissible speed applied can be:
RV : d0 . n ≤ 140'000RVR : d0 . n ≤ 32'000
Critical speed nkr with axial load Fn = 0Critical speed is influenced by the axial load. It can be calculated on request for every satellite roller screw configuration.
When the correct screw end bearings are chosen, their maximum speed will have no effect on thedesired speed. All that needs to be determined is the critical speed nkr for flexural vibration.
The critical speed nkr for flexural vibration can be calculated by the formula below. The correctionfactor fkr depends on the type of bearing and the clamping conditions (figure above).
The calculation is based on the assumption that satellite roller screw nuts provide no guidanceand the bearings at the screw end are considered rigid in the radial direction.
n [min-1] : rotation speednkr [min-1] : critical rotation speednkrzul [min-1] : permissible critical rotation speedL [mm] : free screw length
d0 [mm] : nominal diameter of screw fkr [-] : correction factor for bearing type0,8 [-] : safety factor
The permissible critical speed can be calculated by taking the bearing type into account:
nkrzul = 0.8 . nkr . fkr [min-1]
nkr = 108 . 106 . d0 . 1 [min-1]L2
L L
L L
- 14 -
Driving torqueAll the values for motor rating can be calculated by the formulas below.Note that the load-free torque Mv must be taken into account for preloaded nuts (based on preloading Fv). For single nuts with backlash, the formula is: Mv = 0 [Nm]
Load-free torque
Motor driving torque MM at constant speed
Mv = Fv . P . i . c [Nm]2000 . π
« Ascent » load torque ML1 = P . i . F [Nm]2000 . π . η1
Motor driving torque MM = (MV + ML1,2 + MR . i) [Nm]
« Descent » load torque ML2 = P . i . F . η2 [Nm]2000 . π
Motor driving power PM = MM . nM [W]9.55
The frictional forces of the guide slideway must be taken into account in feed force F.
If, as is possible in « Descent » mode, the motor driving torque is negative, the motor must have a brake.
Driving torque
d [mm] : external diameter of screwd2 [mm] : core diameter of screwP [mm] : screw leadL [mm] : length of satellite roller screwmT [kg] : mass to moveD1 [mm] : diameter of driving wheelD2 [mm] : diameter of driven wheeli [-] : reduction ratioF [N] : feed forceFv [N] : preloading force
Fa [N] : acceleration forceMv [Nm] : load-free torqueML1 [Nm] : « ascent » load torque at constant speedML2 [Nm] : « descent » load torque at constant speedMM [Nm] : motor driving torqueMLa [Nm] : load torque on acceleration MB [Nm] : acceleration torqueMMa [Nm] : motor driving torque on accelerationMR [Nm] : frictional torque of screw bearingsJM [kgm2] : moment of inertia of motor
nM
JM
J1
MM
v
F
J2
i = D1D2
Screw lead P
- 15 -
JR [kgm2] : rotary moment of inertia of screwJT [kgm2] : translatory moment of inertia of screwJ [kgm2] : moment of inertia J1 [kgm2] : moment of inertia of driving wheelJ2 [kgm2] : moment of inertia of driven wheelPM [W] : driving power of motor at constant speedPMa [W] : driving power of motor on accelerationsB [mm] : acceleration pathtB [s] : acceleration timev [m/s] : speed rate
nM [min-1] : rotation speed of motorη [-] : mechanical efficiency of gearingη1 [-] : mechanical efficiency of satellite roller screw
for « ascent » η1 = 0,71…0,89η2 [-] : mechanical efficiency of satellite roller screw
for « descent » η2 = 0,61…0,85c [-] : coefficient of friction referred to preloading
c = 0,1…0,5(for efficiencies η1 + η1 see page 6)
The rotary moment of inertia of screw JR is a rough estimate.We shall be happy to calculate the exact value on request.
Motor driving torque MMa with acceleration
Load torque MLa = P . i . (F + F2) [Nm]2000 . π . η1
Motor speed nM = v . 6 . 104
[Min-1]P . i
Rotation speed reached after acceleration nM = 120 . sB [Min-1]P . i . tB
Path travelled during acceleration sB = nM . tB . P . i [mm]120
Motor driving power PMa = Mma . nM [W]9.55
Acceleration torque MB = f (nM) MB = nM . J [Nm]9.55 . tB . η
Acceleration torque MB = f (sB) MB = 4 . π . sB . J [Nm]P . i . tB2 . η
Acceleration time tB = f (nM) tB = nM . J [s]9.55 . MB . η
Acceleration time tB = f (sB) tB = 4 . π . sB . J [s]P . i . MB . η
Rotary moment of inertia (screw) JR = 4.8 . (d1 + d2)4 . L . 10-14 [kgm2] (for steel)
Motor driving torque MMa = (Mv + MLa + MR . i + MB) [Nm]
Sum of reduced moments of inertia J = JM + J1 + i2 (JR + JT + J2) [kgm2]
Translatory moment of inertia JT = mT .( P )2
. 106 [kgm2]2 . π
- 16 -
Calculation example
Satellite roller screws RV 20 x 5
Nominal diameter : d0 = 20 mmLead : P = 5 mmNut : split nut (EF), preloadedMounting position : horizontalLoad direction : both sidesRapid mode : one side, opposite to working load
Operating mode
Peak load
Roughing feed
Finishing feed
Rapid
Time percentageq [%]
q1 = 5
q2 = 40
q3 = 50
q4 = 5
Rotation speedn [min-1]
n1 = 15
n2 = 110
n3 = 70
n4 = 1700
Axial load Fn [N]
F1 = 8300
F2 = 4500
F3 = 4200
F4 = 1150
N°
1
2
3
4
Mean speed nm = 5 . 15 + 40 . 110 + 50 . 70 + 5 . 1700 = 165 min-1
100 100 100 100
PreloadingPreloading is defined for the « finishing feed » operating mode (F3 = 4200 N).
Fv = 4200 = 1484 N2.83
Load on nut half 1Nut half 1 is loaded in operating modes 1, 2 and 3.
As F1, F2 eand F3 ≥ 2,83 Fv:
Nut half 1 is only partly loaded in operating mode 4.
As F4 = 1150 N < 2,83 FV:
Fnv = Fn hence F1V = 8300 NF2V = 4500 NF3V = 4200 N
F4v = 1484 - 0,35 . 1150 = 1082 N
Mean load
Nut 1
Nut 2
Load on nut half 2Half nut 2 is loaded in operating mode 4.Half nut 2 is not loaded in operating modes 1, 2 and 3.
As F4 < 2,83 . Fv:
F1v = F2v = F3v = 0
F4v = 1484 + 0.65 . 1150 = 2232 N
Fma(1) = 83003. 15 . 5 + 45003 . 110 . 40 + 42003. 70 . 50 + 10823 . 1700 . 5 = 3511 N165 100 165 100 165 100 165 100
3
Fma(2) = 22323. 1700 . 5 = 1789 N165 100
3
LifespanDynamic load capacity of a nut C = 23 400 NHalf nut 1
Half nut 2
L10(1) = (23400)3.106 = 296 . 106 revolutions
3511
L10(2) = (23400)3.106 = 2237 . 106 revolutions
1789
- 17 -
Nut rigidity Cme = 1 . 42.5 . 42001/3 = 686 N/µm
Bearing rigidity C1 = 850 N/µm (assumed value)
Driving torque MM is calculated for the peak load of F1 = 8300 N.The screw is directly driven by the motor (i = 1).
Load-free torque:
Load torque:
Frictional torque of bearings:
Peak driving torque of motor at constant speed:
Motor driving power reaches its peak in rapid mode with F4 = 1150 N.
Load torque:
Peak driving power of motor at constant speed:
Driving torque
Mv = 1484 . 5 . 1 . 0.43 = 0.5 Nm2000 . π
PMmax = (1.05 + 0,5 + 0.2) . 1700
= 312 W9.55
ML1 = 5 . 1 . 8300 = 7.6 Nm2000 . π . 0.87
ML4 = 5 . 1 . 1150 = 1,05 Nm2000 . π . 0.87
MR = 0.2 Nm (assumed)
MMmax = 0.5 + 7.6 + 0.2 = 8.3 Nm
Total lifespan
Lifespan in hours (with utilisation factor fN = 0,6)
L10 = [(296 . 106)-10/9 + (2237 . 106)-10/9)]-9/10
L10 = 270 . 106 revolutions
LhN = 270 . 106
= 45 450 h165 . 0.6 . 60
Satellite roller screw rigidity
Free length between fixed bearing and nut 1 = 1000 mmNominal diameter of screw d1 = 20 mm
CS = 164 . 202
= 66 N/µm1000
Total rigidity of satellite roller screw system 1 = 1 + 1 + 1 Cges = 56 N/µmCges 686 66 850
- 18 -
Lubrication
Circulating mineral oils with EP additives to enhance resistance to agingand corrosion in compliance with CL based on DIN 51517, part 2, areespecially suitable for the lubrication of satellite roller screws. Speed,ambient temperature and operating temperature are determining factorsin the choice of viscosity.
The amount of oil required depends on the screw diameter, the numberof supporting rollers and the amount of heat to dissipate. 1 cm3/h (for small screw diameters) to 30 cm3/h (for large screw diameters) canbe used as reference values.
The shortest possible lubrication intervals (…5 minutes) are recommendedfor high loads and longer intervals (5 minutes to 1 hr) for low loads.Automatic lubrication is recommended for high loads and speeds.
For immersion lubrication, the oil level should be such that the bottommostroller is completely submerged in the oil. The amount of oil and the oil-change intervals depend on the loading and installation.
The viscosity of the oil should be chosen to enable an adequate film oflubricant to form on the contact surfaces.
Figure a shows the operating viscosity νκ to achieve for the mean speedof the satellite roller screw and screw diameter.
Viscosity νκ ensures a state of lubrication to fulfil the nominal lifespanprovided the lubrication system is free of foreign bodies.
Nominal viscosity can be calculated on the basis of viscosity νκ with the viscosity-temperature diagram (diagram ν-t, figure b) and the operatingtemperature. Nominal viscosity is the viscosity of oil at 40°C. Viscosity classes ISO VG (DIN 51519) are plotted in diagram ν-t.
Oil lubricationFigure a shows the nominal diameters of RV satellite roller screws. Thediameters of RVR satellite roller screws are slightly different. The requisiteoperating viscosity values can be obtained by interpolation.
Intermediate values can be obtained from the steps. These must be roundedup to the nearest viscosity value.
The operating temperature must be known or estimated to calculatenominal viscosity. The operating temperature must be measured on thenut after stabilisation. A suitable oil can be found in oil suppliers’ lists withthe nominal viscosity at 40°C. In general, an operating temperature of30°C can be taken as a basis for selecting a lubricant.
Example: Satellite roller screw RV 39 x 10Mean operating speed: nm = 1400 min-1
Operating temperature (estimated): t = 25 °C
In figure a, for a number of revolutions nm = 1400 min-1 and a nominal diameter of 39mm, the nominal viscosity is νκ= 33 mm2/s. In diagram ν-t (figure b), the 25°C temperature and 34 mm2/s viscositylines intersect between ISO VG 15 and ISO VG 22. The oil to choose willbe in viscosity class VG 22.
A suitable CLP (DIN 51517) or HLP (DIN 51525) oil can be selectedfrom this class.
Grease lubricationThe best grease lubricants to use are KP (DIN 51825, part 3) with a consistency factor of 2.
Lubrication intervals depend on the screw arrangement, size and operating conditions. Rollvis can provide recommendations for any type of application.
As a general rule, the same lubricants are used for satellite roller screws as for roller bearings, i.e. either oil or grease. The type of lubricant used mostlydepends on operating and maintenance conditions. Unless the customer explicitly instructs otherwise, standard Rollvis grease is applied at the factory.
- 19 -
10
15
20
30
40
50
60708090
100
150
200
10 12 15 20 23 27 30 36 39 48 60 80 100 120
Nominal diameter d0 [mm]
νκ
oper
atin
g vi
scos
itym
m2
s[
]
Mean screw rotatio
n speed nm [min
-1 ] 300
200
150
100008000
6000
5000 4000
30002000
14001000
900800 700
600500
400
Figure a
10
20
30
40
50
60
70
80
90
100
110
120
4 6 8 10 20 30 40 60 100 200 300
Ope
ratin
g te
mpe
ratu
re t
[°C
]
mm2
s[ ]νκ operating viscosity
10006804603202201501006846
3222
15
10
1500
Figure b
- 20 -
AssemblyIf possible, the nut and screw should not be dismantled. However,should this be necessary, an assembly sleeve must be used.External diameter d3 of assembly sleeve:
0
d3 = d2- 0,05
(d2 = screw core diameter)
RV screws always have a multiple-start thread. If the friction torque is dif-ferent after the nut is reassembled, the nut must be taken off again andrefitted on the next thread start until friction torque is correct!
CAUTION
Screw assemblyThe following points must be followed when assembling the screw:1 • Align the screw and slide guideways axially parallel.2 • Fix the nut in housing.3 • Run the nut along the entire length of the thread and check the screw
for ease of movement.
HandlingPlease read the following handling instructions carefully.
To ensure optimal operation and a long lifespan for satellite roller screws, the following points must be scrupulously complied with.
If in doubt, please contact Rollvis.
Satellite roller screws are greased prior to shipment (unless oil lubrication is requested).
Do not remove this grease. Only use this type of grease for relubrication.
Handle screws with care: do not drop them or damage the thread.
Do not unscrew the nut (or only with an assembly sleeve).Carefully align satellite roller screws parallel to the guideways.Alignment errors will damage satellite roller screws.
Only remove satellite roller screws from their original packing just before installation.
Avoid applying radial forces to the nut.
Lubrication
Transport
Installation
Storage
Bending
Handling advice
- 21 -
Type RV ........ diameters of 3.5 to 12 22
Type RV ......... diameters of 15 to 23 23
Type RV ......... diameters of 25 to 36 24
Type RV ......... diameters of 39 to 48 25
Type RV ......... diameters of 51 to 75 26
Type RV ...... diameters of 80 to 150 27
Type BRV ......... diameters of 8 to 44 28
Type RVR ...... diameters of 8 to 125 29
Preferenceprogram
- 22 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type D X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
D1
[mm
]
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type RV - Ground screws
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
Terms used in tables
N
RVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRV
0.860.850.880.880.840.880.890.890.900.830.870.890.890.890.900.800.860.880.890.890.790.850.870.890.890.90
3.5 x 15 x 15 x 25 x 37 x 17 x 27 x 37 x 47 x 58 x 18 x 28 x 38 x 48 x 58 x 610 x 110 x 210 x 310 x 410 x 512 x 112 x 212 x 312 x 412 x 512 x 8
3.54.54.54.577777888888
10.510.510.510.510.5121212121212
3.624.624.714.787.097.167.237.287.338.098.178.248.308.358.3810.5910.6410.7010.7510.7912.0912.1412.2212.2512.3212.42
3.354.354.173.976.896.766.626.476.327.897.767.637.497.337.34
10.3810.3110.2110.109.9811.8911.8111.7411.6511.5611.13
5.26.54.53.47.45.94.84.23.47.25.84.74.23.73.211.88.37.16.66.012.08.17.16.36.65.2
3.23.93.93.75.55.75.65.55.05.45.75.55.65.35.18.89.19.09.19.08.69.09.18.99.17.8
20.520.814.511.829.220.316.514.412.427.619.115.213.511.910.834.829.223.320.518.332.527.422.018.817.212.8
1519191919191919192121212121212624242424302626262626
3539393941414141414141414141414846464646504646464646
3131313131313131313131313131313131313131313131313131
4141414141414141414141414141414141414141414141414141
16.020.320.320.320.320.320.320.320.322.322.322.322.322.322.327.325.325.325.325.331.327.327.327.327.327.3
1010101010101010101010101010101010101010101010101010
23333333333333333333333333
410520300210480300210170140570360260210170140600410300240200760520390310260170
3.04.04.04.04.04.04.04.04.05.05.05.05.05.05.06.06.06.06.06.08.08.08.08.08.08.0
8.310.37.25.311.79.37.66.65.411.59.27.56.75.85.018.713.111.310.59.619.012.811.210.010.58.3
6.57.87.87.5
10.911.411.111.010.010.711.411.011.110.710.217.618.117.918.217.917.218.018.117.818.115.7
32.633.023.018.846.332.326.222.919.643.830.424.121.418.917.155.346.436.932.629.151.643.534.929.927.320.4
33334444444444445555455555
- 23 -
Type RV - Ground screws
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
RVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRV
0.840.860.880.890.890.900.820.850.870.880.880.890.900.810.840.860.870.880.890.890.800.840.860.870.880.890.89
15 x 215 x 315 x 415 x 515 x 615 x 820 x 220 x 320 x 420 x 520 x 620 x 820 x 1021 x 221 x 321 x 421 x 521 x 621 x 821 x 1023 x 223 x 323 x 423 x 523 x 623 x 823 x 10
151515151515
19.519.519.519.519.519.519.521212121212121
22.522.522.522.522.522.522.5
15.1415.2215.2515.3215.3715.4619.6519.7119.8019.8319.9419.9820.0421.1421.2121.2821.3321.3921.4921.5822.6522.7222.7922.8722.8923.0023.12
14.8114.7414.6514.5614.4714.1619.3219.2219.1519.0218.9718.6918.6220.8220.7220.6220.5220.4220.1919.9622.3222.2422.1522.0621.9721.7121.62
12.210.910.09.49.68.730.127.625.323.424.224.127.032.229.627.225.226.126.129.434.331.529.126.928.028.131.7
13.213.613.813.913.612.629.831.732.232.032.032.030.931.833.834.534.434.534.633.633.636.036.836.836.937.236.2
32.226.122.520.318.415.450.640.935.131.028.224.721.951.441.435.631.428.625.022.152.141.936.131.828.925.322.4
D1
[mm
]
343434343434424242424242424545454545454545454545454545
565656565656646464646464646868686868686867676767676767
353535353535555555555555555454545454545455555555555555
515151515151656565656565656464646464646465656565656565
35.735.735.735.735.735.743.743.743.743.743.743.743.747474747474747
46.746.746.746.746.746.746.7
141414141414202020202020202020202020202020202020202020
444444444444455555554444444
600460370310270210107084070059052041034012901030850730630500420149012001000860750600500
101010101010202020202020202525252525252530303030303030
19.317.415.915.015.213.947.843.740.237.138.438.242.951.146.943.239.941.541.446.754.450.046.242.744.444.650.3
26.327.327.627.827.325.359.763.364.364.064.064.061.963.567.768.968.869.069.367.267.271.973.573.573.974.572.4
51.141.535.732.229.224.480.364.955.749.144.839.234.781.565.756.549.845.339.735.182.766.557.250.445.940.235.6
555555555555555555555555555
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm (can be reduced on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
Terms used in tables
- 24 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
D1
[mm
]
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type RV - Ground screws
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
Terms used in tables
RVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRV
0.800.850.870.870.890.890.780.850.860.870.880.890.770.840.850.860.880.890.900.900.900.750.820.840.850.870.880.890.90
25 x 225 x 425 x 525 x 625 x 825 x 1027 x 227 x 427 x 527 x 627 x 827 x 1030 x 230 x 430 x 530 x 630 x 830 x 1030 x 1530 x 2030 x 3036 x 236 x 436 x 536 x 636 x 836 x 1036 x 1536 x 20
2424242424242727272727273030303030303030303636363636363636
24.1424.2824.3424.4024.5124.6027.1427.2927.3727.4027.5127.6230.1530.2930.3730.4030.5230.6330.8731.0531.2736.1536.2836.3736.4136.5436.6536.8037.12
23.8223.6323.5323.4223.2122.9826.8226.6526.5626.4326.2226.0029.8229.6529.5629.4329.2229.0128.4427.8126.4135.8335.6335.5635.4435.2435.1234.4833.88
49.141.939.440.647.553.055.346.944.345.753.860.370.861.057.253.950.455.557.767.231.067.557.956.052.548.544.759.766.2
46.651.352.151.952.451.851.757.158.258.259.158.764.572.773.874.176.275.371.676.942.862.170.573.773.975.374.975.777.9
63.343.839.035.230.727.565.244.739.936.031.228.073.250.344.640.435.231.325.122.213.267.446.141.237.232.028.323.619.9
5353535353535353535353536262626262626262627474747474747474
848484848484838383838383929292929292929258110110110110110110110110
6464646464646565656565657171717171717171717070707070707070
7878787878787979797979798585858585858585858484848484848484
55.555.555.555.555.555.555.255.255.255.255.255.264.764.764.764.764.764.764.764.764.776.776.776.776.776.776.776.776.7
2525252525252020202020202020202020202020202828282828282828
66666655555566666666666666666
16901140980860690570181012501080950770640213015001300115094079056044029524901800158014101160980710560
3535353535354040404040405050505050505050506565656565656565
78.066.562.564.475.384.187.874.570.372.685.395.7112.496.990.785.580.088.191.6106.749.1107.291.988.983.376.970.994.8105.1
93.2102.6104.2103.9104.8103.6103.5114.2116.4116.4118.2117.4129.1145.4147.5148.2152.3150.6143.2153.885.5124.1140.9147.4147.8150.5149.8151.4155.8
100.569.561.955.948.743.6103.471.063.357.149.644.5116.279.870.964.155.849.639.935.220.9107.173.165.559.150.845.037.431.6
55555555555555555555555555555
- 25 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
RVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRV
0.730.820.840.850.870.880.890.900.900.840.880.890.900.900.820.870.880.890.900.890.820.840.860.870.880.880.890.890.90
39 x 239 x 439 x 539 x 639 x 839 x 1039 x 1539 x 2039 x 2544 x 644 x 1244 x 1844 x 2444 x 3048 x 548 x 1048 x 1548 x 2048 x 2548 x 3048 x 548 x 648 x 848 x 1048 x 1248 x 1548 x 1848 x 2048 x 24
3939393939393939394444444444484848484848484848484848484848
39.1539.2939.3539.4239.5439.7439.9240.1540.5044.3544.6544.9045.1245.2848.3548.6748.9949.2149.4349.6248.3048.3548.4648.5648.6648.7948.9249.0049.15
38.8238.6538.5438.4438.2438.1237.4936.9036.8043.5443.0342.4741.8841.2347.5447.0546.5345.9745.3844.7547.6347.5447.3847.2147.0446.7646.4946.3045.91
114.398.894.689.883.178.386.890.689.776.884.385.987.786.5155.6130.8138.1140.7151.5108.1153.5148.7139.0130.2137.1141.3142.0143.0164.1
98.5113.1117.6119.2121.8123.7120.5132.8125.9115.6120.3118.3114.9118.7191.9206.4207.9236.7224.2203.7209.2215.8221.4221.8224.0225.0219.2247.9242.5
89.561.554.549.542.738.130.827.024.055.739.031.827.624.570.348.839.635.231.027.289.581.670.261.956.650.745.844.340.5
D1
[mm
]
8080808080808080808080808080100100100100100100868686868686868686
116116116116116116116116116118118118118118150150150150150150122122122122122122122122122
9090909090909090908080808080113113113113113113113113113113113113113113113
1001001001001001001001001009090909090127127127127127127127127127127127127127127127
82.782.782.782.782.782.782.782.782.782.782.782.782.782.710310310310310310388.788.788.788.788.788.788.788.788.7
2828282828282828282828282828454545454545454545454545454545
66666666666666888888666666666
2910214018901690139011908606805502030127092072059025801680124098081069026002350197017001490126010901000850
808080808080808080100100100100100120120120120120120120120120120120120120120120
181.4156.8150.2142.5131.9124.4137.8143.7142.3122.0133.8136.3139.2137.3247.0207.6219.3223.3240.5171.7243.6236.1220.7206.6217.6224.2225.4226.9260.4
197.0226.2235.2238.4243.7247.4241.1265.5251.7231.2240.5236.7229.8237.4383.8412.7415.7473.4448.4407..5418.4431.7442.7443.6447.9450.1438.3495.7485.0
142.197.586.478.567.760.548.942.938.288.461.850.543.938.9111.677.562.955.949.243.1142.0129.5111.498.389.880.672.770.364.2
55555555566666555555666666666
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type RV - Ground screws
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
Terms used in tables
- 26 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
D1
[mm
]
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm for RV 51 and 0.04mm for RV 60 to RV 75 (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type RV - Ground screws
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
High capacity definition
Terms used in tables
RVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRV
0.810.860.880.890.900.870.880.890.890.820.860.870.880.890.900.900.810.860.880.890.900.900.800.860.880.890.770.840.860.860.880.870.880.89
51 x 551 x 1051 x 1551 x 2051 x 2560 x 1560 x 2060 x 2560 x 3060 x 660 x 1060 x 1260 x 1860 x 2060 x 3060 x 4264 x 664 x 1264 x 1864 x 2464 x 3064 x 3670 x 670 x 1270 x 1870 x 2475 x 575 x 1075 x 1575 x 1575 x 2075 x 2075 x 2575 x 30
51515151516060606060606060606060646464646464696969697575757575757575
51.3651.7451.9652.2352.4660.9961.2661.5161.7460.3760.6160.6760.9661.0461.4361.7864.3664.6864.9765.2365.4665.6569.3669.6869.9870.2575.3675.7076.0176.0176.3176.3176.5876.83
50.5550.1249.5348.9948.4158.5558.0257.4656.8759.5659.2759.0558.5358.3457.3856.1063.5563.0662.5461.9961.4160.7968.5568.0667.5567.0174.5574.0873.5873.5873.0773.0772.5371.97
172.0143.0153.9185.3186.5
----
162.3145.6139.4135.4167.2179.2154.5193.6166.8150.0169.9167.1174.3
------------
210.3224.6230.3252.9257.3
----
237.5252.3255.4253.6297.4265.3250.4279.3302.4306.1341.4329.2333.7
----------- -
73.250.341.135.632.7
----
80.061.355.644.844.134.429.387.260.649.142.938.235.9
------------
102102102102102122122122122110110110110110110110115115115115115115130130130130150150150150150150150150
147147147147147166166166166150150150150150150150180180180180180180172172172172210210210195195195195195
125125125125125
----
106106106106106106106118118118118118118140140140140175175175
-175
---
139139139139139189189189189124124124124124124124129129129129129129170170170170191191191233191233233233
105105105105105
----
113.2113.2113.2113.2113.2113.2113.2118118118118118118
133.7133.7133.7133.7153153153
-153
---
5050505050----
4040404040404045454545454550505050636363-
63---
88888----888888888888810101010101010-
10---
2930192014301140940
----
31902360209015501430102076034302280170013601130960
------------
140140140140140
----
180180180180180180180200200200200200200
------------
273.1227.0244.2294.1296.1497.3444.4402.3367.2257.7231.1221.3214.9265.4284.5245.2307.3264.7238.1269.6265.3276.7406.6347.6310.1338.1568.4525.3469.6643.8492.3569.8525.3481.1
420.6449.2460.6505.8514.61211.81191.01163.91134.5474.9504.7510.8507.3594.7530.5500.8558.6604.9612.3682.8658.5667.3724.0781.9786.9773.9918.01227.01261.01862.31265.01812.81798.91754.3
116.279.865.256.552.097.2
184.175.369.1127.097.288.371.270.054.646.4138.596.278.068.260.757.0
160.5110.589.076.5171.8121.097.9
115.384.698.788.580.6
5555555556666666666666666655555555
- 27 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]Single nut,
with backlashand double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque[k
N]
FK
[N2/
3 /µm
]
D1
[mm
]
Effi
cien
cy
Maximum backlash of single nuts: 0.04mm for RV 80 to RV 92 and 0.05mm for RV 100 to RV 150 (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type RV - Ground screws
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
High capacity definition
Terms used in tables
RVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRVRV
0.790.820.840.850.870.880.880.890.890.840.860.880.850.840.870.860.880.890.860.870.880.830.830.850.850.870.870.870.850.870.880.820.840.860.860.810.830.850.86
80 x 680 x 880 x 1080 x 1280 x 1880 x 2080 x 2480 x 3080 x 3692 x 1292 x 1892 x 24100 x 15100 x 15100 x 20100 x 20100 x 25100 x 35100 x 18100 x 24100 x 30120 x 15120 x 15120 x 20120 x 20120 x 25120 x 25120 x 30120 x 18120 x 24120 x 30135 x 15135 x 20135 x 25135 x 30150 x 15150 x 20150 x 25150 x 30
808080808080808080929292999999999999100100100120120120120120120120120120120135135135135150150150150
80.3780.4980.6180.7481.0081.0981.2881.5381.7792.6993.0193.30100.04100.04100.35100.35100.65101.23101.02101.32101.60121.00121.00121.37121.37121.68121.68121.98121.04121.30121.64136.06126.38136.70137.00151.06151.39151.71152.02
79.5679.4179.2779.1278.5678.3978.0477.4876.9191.0890.5890.0797.6197.6197.1197.1196.6095.5298.6098.0897.55
118.62118.62118.13118.13117.63117.63117.11118.61118.10117.59133.62133.14132.65132.14148.63148.15147.66147.10
---------------------------------------
---------------------------------------
---------------------------------------
138138138138138138138138138160160160200200200200200200185185185240240240240240240240220220220280280280280320320320320
180180180180180180180180180220220220245245245245245245260260260300300300300300300300260260260345345345345385385385385
130130130130130130130130130210210210260
-260
-260260230230230280
-280
-280
--
230230230
--------
158158158158158158158158158234234234281304281304281281260260260300354300354300354354260260260393393393393437437437437
141.7141.7141.7141.7141.7141.7141.7141.7141.7163.7163.7163.7203
-203
-203203188188188243
-243
-243
--
223223223
--------
50505050505050505063636363-
63-
6363636363100
-100
-100
--
100100100
--------
10101010101010101010101010-
10-
101010101010-
10-
10--
101010--------
---------------------------------------
---------------------------------------
399.8375.3384.8374.0394.5411.3423.1426.9399.4751.0817.0879.0904.0983.3829.0895.8858.0893.0751.0793.0814.01135.01172.01042.01071.0986.01011.0945.0778.0786.0818.0
1393.01284.01214.01122.01536.01426.01337.01263.0
738.9771.9942.1968.5962.3954.6957.0954.6860.21791.01844.01850.02581.03533.02609.03545.02646.02598.01921.01891.01923.03414.04645.03466.04683.03535.04764.04726.02534.02537.02577.06033.06145.06264.06154.07285.07481.07571.07601.0
154.2131.7119.3109.587.482.475.768.259.0169.8137.2118.0139.9155.5119.8133.5107.690.8124.8106.096.4155.2171.7133.1146.7119.1132.0120.4138.6118.4106.5194.3167.0149.8134.9210.5181.9161.7147.3
666666666666555555666555555566655555555
- 28 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]
C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv[N
]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
D1
[mm
]
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm for BRV 8 and 0.04mm for BRV 12 and BRV 44 (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type BRV - Rolled screws
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
Terms used in tables
BRVBRVBRVBRVBRVBRVBRVBRVBRVBRVBRVBRVBRVBRVBRVBRV
0.890.890.890.880.890.880.890.860.870.890.860.890.890.880.900.90
8 x 512 x 412 x 515 x 415 x 520 x 520 x 1023 x 423 x 523 x 1027 x 527 x 1030 x 1039 x 1039 x 2544 x 30
812121515
19.519.522.522.522.5272730393944
8.312.2512.3215.2515.3219.8320.0422.7922.8723.1227.3727.6230.6339.7440.5045.28
7.4511.6511.5615.6515.5619.0218.6222.1522.0621.6226.5626.0029.0138.1236.8041.23
2.64.44.67.06.616.312.620.318.814.730.942.2238.854.862.760.5
3.76.26.39.69.722.321.725.725.725.340.741.052.786.588.183.0
9.414.813.517.716.024.421.928.425.117.731.522.124.630.119.024.5
21262634344242454545535362808080
41464656566464676767838392116116118
31313135355555555555656571909080
4141415151656565656579798510010090
22.327.327.335.735.743.743.746.746.746.755.255.264.782.782.782.7
10101014142020202020202020282828
3334444444556666
170310260370310590340100086050010806407901190550590
588101020203030304040508080100
4.17.07.3
11.210.525.920.032.329.923.549.267.061.787.199.696.1
7.512.512.719.319.544.843.351.551.550.781.582.2105.4173.2176.2166.2
14,923.621.528.225.438.734.745.139.828.049.935.139.147.730.138.9
4555555555555556
- 29 -
D2 L4
[mm
]
[mm
]
L1
[mm
]W
itho
utw
iper
s
L1
[mm
]W
ith
wip
ers
L2
[mm
]
L3
[mm
]
Type ND X P d0 d1 d2
[mm
]
[mm
]
[mm
]
C Co FK
[kN
]
[kN
]
[N2/
3 /µm
]C Co
[kN
]
Single nut, with backlash
and double nut
Split nut,preloaded,
without backlash
Fv Mv
[N]
[Ncm
]
Split nuts,preloaded,preloading
torque
[kN
]
FK
[N2/
3 /µm
]
D1
[mm
]
Effi
cien
cy
Maximum backlash of single nuts: 0.03mm for RVR 8 to RVR 40 and 0.04mm for RVR 50 to RVR 125 (can be less on request).If possible, provide a lubrication hole in the nut (contact Rollvis for feasibility and position).
Type RVR - Ground screws - System with rollers’ recycling
P ---------- LeadD --------- Reference diameterN --------- Number of startsd0 ------- Nominal diameter
d1 ------- External diameterd2 ------- Thread bottom diameterC --------- Dynamic load capacityCo ------- Static load capacity
Fk -------- Rigidity factorFv -------- Preloading forceMv ------ Load-free torque due to preloading
Terms used in tables
RVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVRRVR
0.660.770.840.880.740.820.870.710.800.860.770.770.840.610.740.820.700.800.650.770.610.740.560.700.760.800.660.730.770.610.690.740.650.700.740.70
8 x 0.258 x 0.58 X 18 X 2
10 x 0.510 X 110 X 2
12 x 0.512 X 112 X 2
16 x 0.516 X 116 X 2
20 X 0.520 X 120 X 225 X 125 X 232 X 132 X 240 X 140 X 250 X 150 X 250 X 350 X 463 X 263 X 363 X 480 X 280 X 380 X 4100 X 3100 X 4100 X 5125 x 5
7.807.807.637.639.639.639.6311.9811.6311.6315.6616.0016.0019.3619.6319.6325.0025.0032.0032.0039.6339.6349.6349.6349.4549.2662.2662.0062.2679.2679.0078.5298.8998.5298.15123.15
8.008.008.008.0010.0010.0010.0012.0012.0012.0016.0316.3716.3719.5520.0020.0025.3725.3732.3732.3740.0040.0050.0050.0050.0050.0063.0063.0063.0080.0080.0080.00100.00100.00100.00125.00
7.697.587.197.199.419.199.1911.5811.1911.1915.2215.5615.5619.1419.1919.1924.5624.5631.5631.5639.1939.1949.1949.1948.7948.3861.3860.6861.3878.3877.6876.7697.5796.7695.95120.95
7.96.45.15.17.15.65.66.66.36.37.37.07.0
15.711.111.119.219.241.041.052.652.6102.0101.989.983.4124.6107.2124.6
-------
6.16.46.06.07.57.27.26.88.78.710.910.510.518.918.118.135.035.060.760.690.390.3163.0163.0165.6167.0243.1235.1243.0
-------
30.221.014.714.722.515.815.820.417.217.218.818.718.735.925.925.933.833.842.242.249.349.363.863.851.544.850.140.050.1
-------
1919202022222224242429292934343442425353707082828282105105105138138138170170170220
4242434343434346464653535356565667678383104104124124124124148148148195195195230230230260
3131313131313131313131313137373744445555666680808080110110110175175175180180195262
4141414141414141414141414147474754546767808094949494124124124189189189196196215282
19.819.820.820.822.822.822.825.325.325.332.732.732.735.735.735.743.743.755.255.272.772.784.784.784.784.7105.2105.2105.2141.7141.7141.7173.7173.7173.7223
1010121212121210101014141414141414142020282828282828404040505050565656100
2222222333444444445566666688810101012121212
12501000730460120088057013001000670127012508901800147010801870144026002080309025503320282024602180319028402540
-------
666688810101015151520202030305050707090909090120120120
-------
12.510.28.08.011.38.98.910.510.110.111.711.111.124.817.617.630.430.465.165.183.583.5161.8161.8142.7132.4197.8170.2197.8360.7320.7360.9492.0447.7485.6856
12.112.812.112.115.114.414.413.617.417.321.721.021.037.936.136.170.070.0121.3121.3180.7180.7326.1326.1331.1333.9486.2470.1486.1835.6844.2834.41276125814313102
47.933.323.323.335.725.025.032.327.427.429.929.629.657.041.241.253.653.667.067.078.378.3101.3101.381.871.079.563.579.5121.098.2121.0101.187.186.1126.2
111211211211211212121212221121121111
- 30 -
Applications
The great flexibility of Rollvis SA means it can make all types of screws and nuts as shown in the examples below:
RV 26 x 4,5
RV 8 x 2
RV 15 x 10
RV 30 x 2
- 31 -
RVR 17 x 2
RV 40 x 5
RV 14 x 2
RV 20 x 8,5
- 32 -
Applications (ctd.)
RV 17 x 9
RV 45 x 9
RVR 32 x 1
Quality assurance
ROLLVIS SA is certifiedISO 9001/2000and ASD-EASE
according to EN9100
ROLLVIS SA136, ch. du Pont-du-CentenaireCH-1228 Plan-les-OuatesGENEVA - SWITZERLANDCorrespondence: CP 590CH - 1212 Grand-Lancy 1GENEVA - SWITZERLANDPhone: +41 (0)22 706 90 40Fax: +41 (0)22 706 90 49E-mail: [email protected]: www.rollvis.com
Your nearest agent