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Safety couplings
For direct and indirect drives..........................
Modular System... ..........................................
Working method and function principle..........
Adjusting the disengagement torque .............
For indirect drives
Series SK.......................................................
SKG................................................................
SKL................................................................
With bellows attachment
Series SB.......................................................
SBA................................................................
SBB................................................................
SBC................................................................
with elastomer attachment
Series SE.......................................................
SEA................................................................
SEB................................................................
SEC................................................................
Special couplings............................................
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
Safe
ty c
ou
plin
gs
Safetycouplings
1 www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
Safety couplings for direct and indirect drives
Due to the constantly increasing automation and dyna-
mics of modern work processes, the devices which
protect the complex and expensive units against resul-
ting damages in case of errors are increasing in impor-
tance. JAKOB safety couplings reduce expensive
machine damages, repairs and down time by acting as
torque limiters and overload protection, absolutely reli-
ably. JAKOB safety couplings are the life insurance for
your machines, no matter whether the error is due to
incorrect operation, programming error, material over-
load or tool breakage.
indirect drives:
direct drives:
series SK
series SB / SE
JAKOB- safety couplings are the result of decades of
continuous research and development as well as the
experience gained from thousands of different applica-
tions worldwide.
Unique design aspects, high quality materials, precision
machining of the individual components are some of the
factors which make JAKOB couplings one of the leading
couplings today. The safety couplings are used in all
areas of the machine tool industry, ranging from critical
servo drive applications to overload protection in convey-
or systems.
Output characteristics
+ optimal overload protection
+ backlash free torque transfer
+ stepless disengagement torque adjustment
+ fixed point reengagement (360° synchronised position)
+ automatic re-engaging
+ degressive spring characteristic
+ excellent dynamic functional characteristics
+ large selection of types (modular system)
+ compensation of shaft misalignments
+ integral fitting of pulleys
bell housing Proximity switch AC - servo motor
Safety coupling Series SB
AC - servo motor
Toothed belt drive
Spindle bearing
Safety coupling
Series SKProximity switch
Safetycouplings
2www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
Safety couplings Modular system
The modular safety coupling system consists of four stan-
dard series, each of which when combined with different
attachments result in customized solutions for the specific
requirements.
For indirect drives, pulleys, gears etc. can be mounted on
the couplings to customize it for the application. For direct
drives the safety coupling unit can be attached to metal
bellows, elastomer spider or membrane hubs to obtain
a safety coupling capable of compensating shaft misalign-
ments also. The main selection criteria for safety
couplings are the torque to be transmitted, required
torsional stiffness, existing shaft diameters the installation
environment as well as the operating factors, temperature
and shaft misalignments.
Note
Summary
Safety mechanism attachments Series2 Nm - 1.500 Nm
- pulleys
- gears
- flange
- metal bellows
- straight
- corrugated
- elastomer spider
- oscillation dampening
- plug in
SK
SB
SE
- To reduce the wear of the safety coupling mecha-
nism the drive should be stopped as soon as possi-
ble after disengagement. The switching signal of
the limit switch can be used for this (emergency-
OFF function) purpose
- In vertical drive axis the slide or the table can drop
upon disengagement of the safety coupling due to its
own weight and also the low residual torque of the
safety coupling. To counter this effect it is suggested
that either a compensating weight or an additional
brake be provided.
- During the coupling selection the linear measuring
system (positioning) must also be considered. When
fitting a encoder on the drive motor a torsionally stiff
coupling should be used to get the best result.
- To minimise surface impact and to prevent a possi-
ble jamming, care is to be taken when tightening the
conical connection of series SK.
- The safety coupling is maintenance free under nor-
mal operating conditions.
- For mountening instructions and explanations about the shaft - hub - connection, please look
at >Servo couplings< page 6-8.
Safetycouplings
3 www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
Safety coupling Working method and function principle
The backlash free ball locking mechanism
balls
thrust plate
feed motion
cup spring
adjusting nut
conical bush
hub
flange ring
The clutch series SBE and SKD are equipped with an
additional control mechanism, which prevents a reenga-
ging i.e. allows the balls to ratched over until standstill.
The drive train is thereby put in a “stand by” state and the
residual torque reduced to a minimum. The reengage-
ment takes place automatically in either direction upon
reversal of the rotation direction at low speeds as and
when the reference position is reached.
JAKOB safety couplings are designed as nominal break points
or as overload protection in a direct or indirect drive train.
The heart of the safety coupling is a highly precise, sturdy
declutching mechanism with steel balls as spring loaded
positive locking elements.
The drive torque is guided into the centrally arranged hub via
a frictional, backlash free radial clamping hub or conical bush
connection. The hub is designed as a ball cage and serves for
fitting the flange ring and the thrust plate with the cup springs
press the balls over a thrust plate into hardened detents
(calotte) of the flange ring. In normal operation the drive torque
is transferred, backlash free, into the flange ring. For the further
transfer of the torque and speed, a choice of compensation
elements (metal bellows, elastomer spider, membrane hubs), a
gear or pulley or an appropriate connection flange is fitted to
the flange ring. If the set disengagement torque is exceeded in
the case of a crash or collision, the flange ring turns in relation
to the cage hub and the balls are abruptly pushed out of the
detents. The drive train is cut-off within a few milliseconds.
The axial stroke of the indexing plate can be
used with a proximity or mechanical limit switch
for the immediate stop (emergency-OFF) of the
drive.
The degressive spring characteristic
The dynamic disengagement characteristics
The patented preloading principal of the hardened and
polished steel balls between the ball cage, the hub, and
the detents of the flange ring ensure a backlash free
torque and angular motion transfer with high torsional
stiffness. The mechanism is effective in reverse direction
also i.e. for clockwise or counter-clockwise operation.
The function of the safety coupling is influenced substan-
tially by the cup springs, developed specifically for this
application. Due to its operation in degressive characteri-
stic range, the spring force drops with increasing spring
stroke (switching path), whereby the torque drops
immediately on response. With conventional spring
loaded torque limiters on the other hand, springs are
stressed even further and the spring force as well the
disengagement torque increase considerably before the
actual disengagement takes place, leading to additional
damage, This results in undesirable functional characteri-
stics between response and disengagement.
JAKOB safety clutches are distinguished by their excel-
lent dynamic disengagement characteristics. The reason
for this is the degressive spring characteristic, as well as
the minimised masses (ball and indexing plate), which
must be accelerated, axialy during disengagement.
The product of mass and acceleration (F=m* a) results in
a force which must be added to the spring force. In con-
ventional couplings where large masses have to be
moved, the static disengagement torque and the swit-
ching time can increase by several times.
The re - engagingThe balls, the cage bores and detents are distributed
asymmetric on the circumference, so that every 360° only
one synchronized location is possible. Until then the balls
ratchet over with a low residual torque (max. 5% of
TN). After elimination of the breakdown cause, the
coupling re-engages during operation at low speed
(<60r.p.m) automatically again into the synchronized posi-
tion and is ready for function. The relocation time for the
reference point location is reduced considerably due to the
synchronous reengagement.
The release mechanism
angle of twist
responce
disengagement
residual torque
angle of twist
respose
disengagementresidual torque
spring path
spring forc
e
Customary spring loaded JAKOB-safety coupling
Nm
Nm
working range response
Safetycouplings
4www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
Safety couplings Adjusting the disengagement torque
Series SK
Caution!
Series SB/SE
Release retaining screw. Turn adjusting nut with pin wrench (note reference mark); tightening retaining screw on
hub after setting the required disengagement torque. Setting can be done by turning the hub with scale till the
torque value to be set is in line with the reference mark; with Series SEA and SBC the two
radial clamping screws must be released in addition and retightened with the specified tightening torque after
adjustment.
The disengagement torque is generally between approximately 40% and 100% of the nominal torque of
the coupling and is steplessly adjustable. If the customer does not specify a setting value, the setting is
done at the maximum torque (nominal torque). The set, static disengagement torque can be adjusted (on the
machine) if necessary at a later date by turning the adjusting nut with a pin wrench. Adjusting nuts in the series
SB and SE are provided with a user friendly scale; with series SK the disengagement torque, and the
reference marks for Tmin and Tmax, are engraved on the face side of the adjusting nut to facilitate setting.
Due to the degressive spring characteristic within the setting range, a turning back (counter
clockwise) of the adjusting nut means an increase, or a turning in clockwise direction means a
reduction of the disengagement torque!
Unscrew retaining screw (see detail Z) completely; turn adjusting nut with pin wrench; after adjustment secure
the adjustment nut against turning by drilling and tightening the self tapping screw.
Detail Z
reference markon the hub(setting thread)
setting range betweenMin - Max - mark
=TA 70Nm
+
JAn rt iebstechnik
BOKA
Min
--
Max
retainingscrew
Z
Setting marking for disengagement torque
referencemark
retaining screw Clamping screw
retainingscrew
hole forpin wrench
referencemark
Series SBA / SBB / SEB / SEC Series SBC / SEA
Setting scale for disengagement torque:
Safetycouplings
5 www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
Safety coupling Series SK
Safetycoupling
6www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
• for the attachment of toothed belt pulleys, gear wheels, chain wheels, flanges ...
• with integrated ball bearing or sliding bearing - optimal constructional adjustment
• frictional shaft-hub-connection with conical clamping bush resp. conical clamping ring
Series SKLSeries SKG
For overload protection resp. as collision protection for indirect drives, JAKOB's standard program presents
series SKG with integrated ball bearing, as well as series SKL with integrated sliding bearing. They enable the
adjustment of toothed belt pulleys, gear wheels or other units to the coupling flange rings with a concentricity -
resp. run-out exactness of a few hundredth of millimeters. During normal operation, the bearings must take up
the radial and axial forces and transfer them to the drive, resp. output shaft, only during uncoupling there is a
relative rotating movement between flange ring and hub for a short time. The chosen torque is transferred
backlash free and frictionally from the shaft to the coupling hub by a conical clamping ring resp. a conical
clamping bush. As the SKL coupling can be used for small pulleys and pinions because of the reference diame-
ter of the fastening threads, series SKG with its integrated ball bearing provides a good alternative for very com-
pact constructional solutions. In this cases, the coupling body can almost completely be fit into the pulley with
the result, that the forces can be led almost centrically to the bearing. Futhermore, the clamping ring is located
at the inside,at the side of the shaft, and therefore a subsequent mounting (modification) is possible, even when
available space is limited. Other safety coupling series for indirect drives, such as e.g. series SKM with
seperate sliding bearing or Series SKD with blocking mechanism can be delivered upon special request.
Application examples:
indirect ball- srew- drive:
Safety coupling series SKG with inte-
grated toothed belt pulley
indirect servo axis drive with SK
coupling as collision protection
Safety coupling Series SKGfor indirect drives
• with integral ball bearing - with conical clamping ring
• compact attachment - optimal system integration
SKG
static disengage- moment mass tightening torquement torque of inertia approx. of screws “ i ”
SizeTKA [Nm] [10-3kgm2] [kg] [Nm]
<setting range> <clamping ring>
4 2 - 4 0,2 0,5 4
9 4 - 9 0,2 0,5 4
18 9 - 18 0,2 0,5 4
23 9 - 23 0,7 1,1 8
35 18 - 35 0,7 1,1 8
75 25 - 75 0,7 1,1 8
100 50 - 100 1,8 1,9 12
170 65 - 170 3 2,4 12
270 100 - 270 10,4 5 34
550 200 - 550 10,7 5,3 34
1000 400 - 1000 65 16 115
1500 600 - 1500 67 16 115
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 mH
Ordering example: SKG 170 - 28 H7 - TA=140 Nm
n
Ø p
Ø k
Ø D
g
l
Ø c
f s Feed motion
i - DIN 912
h7
e
Material: heat - treated steel
SKG Ø c e f g 6x i Økh7 l n Ø p s Ø D
min. max.
4 27 11 8 27,3 M 4 60 40 4x M 4 53 1 12 18
9 27 11 8 27,3 M 4 60 40 4x M 4 53 1 12 18
18 27 11 8 27,9 M 4 60 40 4x M 4 53 1 12 18
23 37 17 12 39 M 5 77 54 4x M 6 69 1,4 18 25,5
35 37 17 12 39 M 5 77 54 4x M 6 69 1,4 18 25,5
75 37 17 12 39 M 5 77 54 4x M 6 69 1,4 18 25,5
100 54 17 10 36,7 M 6 92 55 4x M 6 83 1,4 22 39
170 54 17 12 51 M 6 105 66 4x M 6 94 1,7 22 39
270 66 26 15 63,5 M 8 135 85 6x M 8 120 2,2 29 44
550 66 26 15 63,5 M 8 135 85 6x M 8 120 2,2 29 44
1000 90 38 15 89,4 M 12 190 134 6x M 12 168 3,2 41 62
1500 90 38 15 89,4 M 12 190 134 6x M 12 168 3,2 41 62
Safetycouplings
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Safety coupling Series SKLfor indirect drives
• with integrated sliding bearing - with conical bush
• with small centric diameter for small size pulleys
SKL static disengagement moment mass tightening torquetorque TKA [Nm] of inertia approx. of screws “ i ”
Size <setting range> [10-3kgm2] [kg] “conical bush” [Nm]
4 2 - 4 0,2 0,5 4
9 4 - 9 0,2 0,5 4
18 9 - 18 0,2 0,5 4
23 9 - 23 0,7 1,1 12
35 18 - 35 0,7 1,1 12
75 25 - 75 0,7 1,1 12
100 50 - 100 1,8 1,9 12
170 65 - 170 3 2,4 12
270 100 - 270 10,4 5 34
550 200 - 550 10,7 5,3 34
1000 400 - 1000 65 16 115
1500 600 - 1500 67 16 115
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 mH
Ordering example: SKL 100 - 25 G7 - TA=80 Nm
Ø D
e2Ø m
n
Ø p
Ø k
f
Ø D
Ø c
g
l
h6
H7
H7
s Feed motion
i - DIN933Size 4 / 9 / 18 - DIN912
w
e1
Material: heat - treated steel
SKL Ø c e1 e2 f g 6x i Ø k l Ø m 6xn Ø p s w Ø D
min. max.
4 27 22 10 6 9 M 4 60 46 30 M 5 40 1 19 10 16
9 27 22 10 6 9 M 4 60 46 30 M 5 40 1 19 10 16
18 27 22 10 6 9 M 4 60 46 30 M 5 40 1 19 10 16
23 36 28 15 6 16 M 6 77 61,5 36 M 6 50 1,4 22 18 24
35 36 28 15 6 16 M 6 77 61,5 36 M 6 50 1,4 22 18 24
75 36 28 15 6 16 M 6 77 61,5 36 M 6 50 1,4 22 18 24
100 50 31 20 6 22 M 6 92 71 48 M 6 65 1,4 22 22 35
170 50 31 20 8 22 M 6 105 74,4 48 M 6 65 2 22 22 35
270 62 37 20 12 31 M 8 135 99,5 58 M 8 76 2,2 34 28,5 41
550 62 37 20 12 31 M 8 135 99,5 58 M 8 76 2,2 34 28,5 41
1000 90 54 20 16 35 M 12 190 143,5 90 M 12 125 3,4 55 41,5 62
1500 90 54 20 16 35 M 12 190 143,5 90 M 12 125 3,4 55 41,5 62
Safetycouplings
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Safety coupling Series SB with bellow attacment
JAKOB's standard program offers three versions with different hubs:
Series SBA - with conical clamping bushing on both sides
Series SBB - with EASY-clamping hub on the side of the bellow
Series SBC - with EASY-clamping hub on both sides
bell housing proximity switch AC servo motor
safety coupling series SB
spindle bearing
The safety couplings of series SB are a combination of
the disengagement mechanism, which has proven
itself for decades, and a torsionally stiff four-corrugated
metal bellow of series KP (size 900, and size 1500 with
6-corrugated KM-bellow). In a big variety of
applications, particularly as collision protection in feed
axes of machine tools, they have proven their
effectiveness. Main characteristics of series SB are the
compact size, low moment of inertia, the compensation
of misalignment between drive shaft and output shaft
with low restoring forces, as well as an absolute
backlash free, conformal torque transfer because of
the very high torsional stiffness of the metal bellow and
the ball locking mechanism. For further technical
details and a description of the adjustment of the
torque, see page 4 resp. page 5.
Note: For speeds of more than 3600 rpm, please
contact us for technical examination.
The conical clamping bushing version is of rotation sym-
metrical design and is particularly suitable for smaller shaft
diameters. The versions with radial EASY-clamping hub
are much easier to fit, however, they are a little longer.
Further options, such as blocking mechanism, higher
torque, alternative bellow forms (e.g. 6-corrugated KM-bel-
low) or hub versions (e.g. with KPS conical expanding hub
on bellow side) are possible upon request.
• optimal overload and collision protection for direct drives• high torsional stiffness - exact torque transfer• whole metal version - low moment of inertia• compensation of misalignments - low restoring forces
Savetycouplings
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Safety coupling Series SBA with bellow attachment
• with conical bushing on both sides
• compact and short design
static disengagement moment torsional max. shaft axial lateral mass tighteningSBA torque TKA [Nm] of inertia stiffness misalignment [mm] spring rate spring rate approx. torque [Nm]Size <setting range> [10-3kgm2] [Nm/arcmin] axial ± lateral [N/mm] [N/mm] [kg] screws i / j
5 2 - 5 0,25 7 0,5 0,2 70 480 0,7 4 / 4
10 4 - 10 0,25 7 0,5 0,2 70 480 0,7 4 / 4
20 8 - 20 0,25 7 0,5 0,2 70 480 0,7 4 / 4
40 15 - 40 0,7 12 0,6 0,2 70 650 1,3 14 / 12
80 30 - 80 0,7 12 0,6 0,2 70 650 1,3 14 / 12
120 50 - 120 1,9 25 0,8 0,2 100 1000 2,2 14 / 12
200 80 - 200 2,8 25 0,8 0,2 100 1000 2,5 14 / 14
300 100 - 300 9 40 0,8 0,2 95 1350 5 35 / 35
560 200 - 560 12 90 0,7 0,2 170 4200 6 65 / 35
1000 400 - 1000 63 95 1,0 0,3 145 1000 16 65 / 115
2000 800 - 2000 64 150 1,0 0,3 130 920 17 115 / 115
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 cH
Ordering example: SBA 120 - D1 = 28 G6 - D2 = 22 H6 - TKA= 100 Nm
ØD
1
Øc1
La
Øc2
Øa
ØD
2
s Feed motion
j - DIN 933
i - DIN 933
w
Øb
t1 t2
Material:
- bellows: stainless steel
- safety part /
conical bushing: heat-treated steel
- screws: nickel plated
SBA Ø a Ø b Øc1/Øc2 6 x i 6 x j La-2 s t1 / t2 w Ø D1/2 Ø D1/2
min max
5 64 56 30 / 27 M 4 * M 4 * 75 1,0 18 22 9 19 / 16
10 64 56 30 / 27 M 4 * M 4 * 75 1,0 18 22 9 19 / 16
20 64 56 30 / 27 M 4 * M 4 * 75 1,0 18 22 9 19 / 16
40 79 66 36 M 6 M 6 87 1,4 24 26,5 12 24
80 79 66 36 M 6 M 6 87 1,4 24 26,5 12 24
120 94 82 50 M 6 M 6 98 1,4 27 29 18 35
200 105 82 50 M 6 M 6 100 2,0 27 27 18 35
300 135 101 62 M 8 M 8 120 2,2 32 35 26 42
560 135 122 70 / 62 M 10 M 8 129 2,2 36 / 32 35 32 / 26 48 / 42
1000 190 132 83 / 95 M 10 M 12 190 3,4 46,5 55 40 60 / 67
2000 190 157 98 / 95 M 12 M 12 193 3,4 46,5 55 40 70 / 67
* DIN 912
Safetycouplings
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Safety coupling Series SBB with bellow attachment
• simple installation, radial EASY-clamping hub on bellow-side
• disengage part with conical hub for small bore diameters
static disengagement moment torsional max. shaft axiale laterale mass tighteningSBB torque TKA [Nm] of inertia stiffness misalignment [mm] spring rate spring rate approx. torque [Nm]
Size <setting range> [10-3kgm2] [Nm/arcmin] axial ± lateral [N/mm] [N/mm] [kg] screws f / j
5 2 - 5 0,25 7 0,5 0,2 70 480 0,7 14 / 4
10 4 - 10 0,25 7 0,5 0,2 70 480 0,7 14 / 4
20 8 - 20 0,25 7 0,5 0,2 70 480 0,7 14 / 4
40 15 - 40 0,7 12 0,6 0,2 70 650 1,2 35 / 12
80 30 - 80 0,7 12 0,6 0,2 70 650 1,2 35 / 12
120 50 - 120 1,8 25 0,8 0,2 100 1000 2,0 65 / 12
200 80 - 200 2,7 25 0,8 0,2 100 1000 2,3 65 / 14
300 100 - 300 8,5 40 0,8 0,2 95 1350 4,8 115 / 35
560 200 - 560 11 90 0,7 0,2 170 4200 5,6 115 / 35
1000 400 - 1000 62 95 1,0 0,3 145 1000 15 190 / 115
2000 800 - 2000 62 150 1,0 0,3 130 920 15 290 / 115
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 cH
Ordering example: SBB 40 - D1 = 32 G7 - D2 = 20 H7 - TKA= 30 Nm
Material:
- bellows: stainless steel
- clamping hub: high tensile aluminium
- safety part /
conical bushing: heat-treated steel
- screws: nickel plated
SBB Ø a Ø b f g1 h 6x j Lb-2 s t 1 t 2 w Ø D1 Ø D2
min/max min/max min/max
5 64 56 M 6 19 7,5 M 4 * 83 1,0 18 / 40 18 22 8 / 30 9 / 16
10 64 56 M 6 19 7,5 M 4 * 83 1,0 18 / 40 18 22 10 / 30 9 / 16
20 64 56 M 6 19 7,5 M 4 * 83 1,0 18 / 40 18 22 10 / 30 9 / 16
40 79 66 M 8 22 8,5 M 6 95 1,4 22 / 43 24 26,5 14 / 34 12 / 24
80 79 66 M 8 22 8,5 M 6 95 1,4 22 / 43 24 26,5 18 / 34 12 / 24
120 94 82 M 10 28 8,5 M 6 110 1,4 24 / 52 27 29 20 / 42 18 / 35
200 105 82 M 10 28 10,5 M 6 112 2,0 24 / 52 27 27 22 / 42 18 / 35
300 135 101 M 12 35 10,5 M 8 132 2,2 28 / 56 32 35 25 / 55 26 / 42
560 135 122 M 12 45 12,5 M 8 140 2,2 28 /64 32 35 40 / 75 26 / 42
1000 190 132 M 14 47 13,5 M 12 208 3,4 36 / 102 46,5 55 40 / 75 40 / 67
2000 190 157 M 16 54 19 M 12 211 3,4 40 / 102 46,5 54 60 / 85 45 / 67
* DIN 912
Safetycouplings
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Safety coupling Series SBC with bellow attachment
• radial EASY-clamping hub on both sides
• simple installation, for large bore diameters
static disengagement moment torsional max. shaft axiale laterale mass tightening SBC torque TKA [Nm] of inertia stiffness misalignment [mm] spring rate spring rate approx. torque [Nm]Size <setting range> [10-3kgm2] [Nm/arcmin] axial ± lateral [N/mm] [N/mm] [kg] screw f
5 2 - 5 0,28 7 0,5 0,2 70 480 0,7 14
10 4 - 10 0,28 7 0,5 0,2 70 480 0,7 14
20 8 - 20 0,28 7 0,5 0,2 70 480 0,7 14
40 15 - 40 0,75 12 0,6 0,2 70 650 1,3 35
80 30 - 80 0,75 12 0,6 0,2 70 650 1,3 35
120 50 - 120 2,0 25 0,8 0,2 100 1000 2,1 65
200 80 - 200 3,0 25 0,8 0,2 100 1000 2,5 65
300 100 - 300 9,0 40 0,8 0,2 95 1350 5 115
560 200 - 560 12 90 0,7 0,2 170 4200 6 115
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 cH
Ordering example: SBC 300 - D1 = 48 G7 - D2 = 52 G7 - TKA= 250 Nm
ØD
1
g1
Øb
Øa
t2t1
h1 h2Lc
w
Feed motion
f- DIN912
f- DIN912
Ø k
Ø D
2
g2
s
Material:
- safety part: heat-treated steel
- clamping hub: high tensile aluminiunm
- bellows : stainless steel
- screws: nickel plated
SBC Ø a Ø b f g1 g2 h1 h2 Ø k Lc-2 s t 1 t 2 w Ø D1 Ø D2
min/max min/max min/max min/max
5 64 56 M 6 19 20 7,5 7,5 24 93 1,0 18/40 15/37 33 8/30 8/27
10 64 56 M 6 19 20 7,5 7,5 24 93 1,0 18/40 15/37 33 10/30 8/27
20 64 56 M 6 19 20 7,5 7,5 24 94 1,0 18/40 15/38 34 10/30 8/27
40 79 66 M 8 22 24 8,5 9 30 107 1,4 22/43 18/45 39 14/34 15/37
80 79 66 M 8 22 24 8,5 9 30 107 1,4 22/43 18/45 39 18/34 18/37
120 94 82 M 10 28 31 8,5 11 40 128 1,4 24/52 22/52 46 20/42 18/48
200 105 82 M 10 28 31 10,5 11 40 132 2,0 24/52 22/52 46 22/42 20/48
300 135 101 M 12 35 43 10,5 12 52 149 2,2 28/56 24/64 52 25/55 28/62
560 135 122 M12/14 45 43 12,5 12 52 159 2,2 28/64 24/64 54 40/75 35/62
Safetycouplings
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Safety coupling Series SEwith elastomer attachment
JAKOB's standard program consists of three series with backlash free, frictional shaft-hub-connection:
series SEA - with radial clamping hub on both sides
series SEB - with conical bushing and radial clamping hub
series SEC - with conical hub on both sides
proximity switch bell housing AC servo motor
safety coupling series SEA
spindle bearing
The large-scaled safety coupling program of JAKOB
has been extended and rounded up with the innovati-
ve series SE for direct drives. The SE types are a com-
bination of the proven safety coupling mechanism of
elastomer couplings of the series EKM and ESM-A.
They represent an alternative to series SB with bellow
attachment. Whereas the specific characteristic of the
metal bellows is the extremely high torsional stiffness,
the elastomer couplings are particularly characterised
by their rugged, excellent dampening characteristics
and the possibility of plug-in fitting. The admissible
max. operation temperature, however, should not
exceed 90°C.
The conical hubs are of rotation symmetrical design and are
appropriate especially for smaller shaft diameters. The
versions with radial clamping hubs are considerably easier to
fit, however, they are a little longer. Because of the plug-in
mounting, the user can change the hub on the side of the
spider without any problems; therefore this coupling is an ideal
and cost-effective solution e.g. for testing stands (see picture)
with different shaft sizes of the testing units.
• optimal overload protection and collision protection for direct drives
• plug-in type - backlash free - flexible - compensation of misalignments
• robust - compact - electrically insulating - oscillation dampening
The elastomer spider's function is to compensate misalignments
between drive shaft and output shaft. By distortion of the
coupling spider (PUR-98 Shore-A) during the plug-in assembly, a
backlash free torque transfer is ensured. elastic deformation dueto axial mounting forces
backlash free due toelastic deformation
galternatespaces knobs
safety-couplings
13 www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
mounting procedure
Safety coupling Series SEA with elastomer attachment
• radial clamping hub on both sides
• simple installation, for large bore diameters
static disengagement moment torsional max. shaft mass tightening torqueSEA
torque TKA [Nm] of inertia stiffness misalignment [mm] approx. screw “f”
Size <setting range> [10-3kgm2] [Nm/arcmin] axial ± lateral [kg] [Nm]
5 2 - 5 0,3 0,37 0,5 0,1 0,7 10
10 4 - 10 0,3 0,37 0,5 0,1 0,7 12
20 8 - 20 0,3 0,37 0,5 0,1 0,7 14
40 15 - 40 0,9 0,93 1 0,1 1,3 30
80 30 - 80 0,9 0,93 1 0,1 1,3 35
120 50 - 120 2,6 1,95 1 0,1 2,4 60
200 80 - 200 3,3 1,95 1 0,1 2,7 67
300 100 - 300 10,5 5,5 1 0,15 5,1 115
550 200 - 550 13 6,7 1 0,15 5,7 115/185
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 mH
Ordering example: SEA 20 - D1 = 22 G7 - D2 = 24 G7 - TA = 15 Nm
h1
x
h2
La
t1 t2
Ø D
1
g1
Ø b
1
Ø D
2
g2
Ø aØ k
s Feed motion
f - DIN 912f - DIN 912
Material:
- safety part: heat-treated steel
- clamping hub: hugh tensile aluminium
- elastomerspider: polyurethane 98 Sh-A
- screws: nickel plated
SEA Øa Øb1 f g1 g2 h1 h2 Ø k La±1 s t 1* t 2* x±1 Ø D1 Ø D2
min/max min/max min/max min/max
5 64 50 M6 16,5 20 9 7,5 18 87 1,0 16 - 26 15 - 36 33 9 - 26 8 - 27
10 64 50 M6 16,5 20 9 7,5 18 87 1,0 16 - 26 15 - 36 33 9 - 26 8 - 27
20 64 50 M6 16,5 20 9 7,5 18 87 1,0 16 - 26 15 - 36 33 10 - 26 8 - 27
40 79 70 M8 25 24 12 9 25 105 1,4 22 - 30 18 - 43 37 15 - 38 15 - 37
80 79 70 M8 25 24 12 9 25 105 1,4 22 - 30 18 - 44 37 20 - 38 20 - 37
120 94 85 M10 30,5 31 14 11 32 123 1,4 24 - 34 22 - 49 44 20 - 46 18 - 48
200 105 85 M10 30,5 31 14 11 32 126 2,0 24 - 34 22 - 50 44 28 - 46 20 - 48
300 135 100 M12 36 43 16 12 40 146 2,2 28 - 36 25 - 60 50 28 - 56 28 - 62
550 135 120 M12/14 44 43 18 12 52 158 2,2 30 - 42 25 - 62 52 35 - 70 38 - 62
Safetycouplings
14www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
*DIN 912 ** if a longer plug in depth is required, please call JAKOB !
Safety coupling Series SEB with elastomer attachment
• simple installation, radial clamping hub
• disengagepart with conical hub for small bore diameters
disengagement moment torsional max. shaft mass tightening torqueSEB
torque TKA [Nm] of inertia stiffness misalignment [mm] approx. screws [Nm]
Size <setting range> [10-3kgm2] [Nm/arcmin] axial ± lateral [kg] “f” “i”
5 2 - 5 0,25 0,37 0,5 0,1 0,6 10 3
10 4 - 10 0,25 0,37 0,5 0,1 0,6 12 4
20 8 - 20 0,25 0,37 0,5 0,1 0,6 14 4
40 15 - 40 0,85 0,93 1 0,1 1,3 30 12
80 30 - 80 0,85 0,93 1 0,1 1,3 35 14
120 50 - 120 2,2 1,95 1 0,1 2, 3 60 14
200 80 - 200 3,1 1,95 1 0,1 2,7 65 14
300 100 - 300 9,5 5,5 1 0,15 5,0 115 3 5
550 200 - 550 12 6,7 1 0,15 5,8 115 35
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 mH
Ordering example: SEB 550 - D1 = 52 G7 - D2 = 38 G7 - TA = 450 Nm
h1
Lb
Ø D
1
g1
Ø b
1
Ø D
2
Ø c
Ø a
t1
Øk
s Feed motion
f - DIN 912 i
t2
Y
Material:
- safety part/
conical bushing: heat- treated steel
- clamping hub: high tensile aluminium
- elastomer spider: polyurethane 98 Sh-A
- screws: nickel plated
SEB Øa Øb1 Øc f g1 h1 i Ø k Lb s t 1** t 2** y Ø D1 Ø D2
min/max min/max min/max
5 64 50 52 M 6 16,5 9 6x M 4* 18 76 1,0 16 - 26 26 22 8 - 26 8 - 16
10 64 50 52 M 6 16,5 9 6x M 4* 18 76 1,0 16 - 26 26 22 10 - 26 8 - 16
20 64 50 52 M 6 16,5 9 6x M 4* 18 76 1,0 16 - 26 26 22 10 - 26 8 - 16
40 79 70 65 M 8 25 12 6x M 6 25 94 1,4 22 - 30 32 27 15 - 38 12 - 25
80 79 70 65 M 8 25 12 6x M 6 25 94 1,4 22 - 30 32 27 18 - 38 16 - 25
120 94 85 82 M 10 30,5 14 6x M 6 32 109 1,4 24 - 34 35 29 20 - 46 18 - 35
200 105 85 82 M 10 30,5 14 6x M 6 32 110 2,0 24 - 34 35 29 22 - 46 22 - 35
300 135 100 105 M 12 36 16 6x M 8 40 131 2,2 28 - 36 44 35 25 - 56 25 - 41
550 135 120 105 M 12 44 18 6x M 8 52 141 2,2 30 - 42 44 35 38 - 70 28 - 41
Safetycouplings
15 www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
*DIN 912 ** if a longer plug in depth is required, please call JAKOB !
Safety coupling Series SEC with elastomer attachment
• with conical bush on both sides
• compact and short design
static disengagement moment torsional max. shaft mass tightening torqueSEC torque TKA [Nm] of inertia stiffness misalignment [mm] approx. screws [Nm]
Size <setting range> [10-3kgm2] [Nm/arcmin] axial ± lateral [kg] “ i ” “ j ”
5 2 - 5 0,3 0,37 0,5 0,1 0,7 3 6
10 4 - 10 0,3 0,37 0,5 0,1 0,7 4 8
20 8 - 20 0,3 0,37 0,5 0,1 0,7 4 8
40 15 - 40 1,1 0,93 1 0,1 1,8 12 8
80 30 - 80 1,1 0,93 1 0,1 1,8 14 8
120 50 - 120 2,7 1,95 1 0,1 2,8 14 35
200 80 - 200 3,5 1,95 1 0,1 3,1 14 35
300 100 - 300 11,0 5,5 1 0,15 6,0 35 65
550 200 - 550 16,0 6,7 1 0,15 7,5 35 115
Technical data:
Dimensions: (mm) length dimensions according to DIN ISO 2768 mH
Ordering example: SEC 120 - D1 = 28 G6 - D2 = 22 G6 - TA = 100 Nm
Ø D
1
Ø e
YLc
t1 t2Ø
k
Ø D
2
Ø c
Ø a
s Feed motion
j - DIN 912
i - DIN 933
Material:
- safety part : heat-treated steel
- conical bush: heat-treated steel
- clamping hub: high tensile aluminium
- elastomer spider: polyurethane 98 Sh-A
- screws: nickel plated
SEC Øa Øc Øe i j Ø k Lc s t 1** t 2** y Ø D1 Ø D2
min/max min/max min/max
5 64 52 50 6 x M 4* 4x M5 18 86 1,0 20-36 26 22 10 - 24 8 - 16
10 64 52 50 6 x M 4* 4x M5 18 86 1,0 20-36 26 22 10 - 24 8 - 16
20 64 52 50 6 x M 4* 4 x M 5 18 83 1,0 20-36 26 22 10 - 24 8 - 16
40 79 65 65 6 x M 6 8 x M 5 25 103 1,4 22-38 32 27 12 - 35 12 - 25
80 79 65 65 6 x M 6 8 x M 5 25 103 1,4 22-38 32 27 16 - 35 16 - 25
120 94 82 80 6 x M 6 4 x M 8 32 123 1,4 28-44 35 29 18 - 40 18 - 35
200 105 82 80 6 x M 6 4 x M 8 32 124 2,0 28-44 35 29 22 - 40 22 - 35
300 135 105 100 6 x M 8 4 x M 10 40 153 2,2 32-58 44 35 20 - 48 25 - 41
550 135 105 120 6 x M 8 4 x M 12 52 164 2,2 35-65 44 35 24 - 60 28 - 41
Safetycouplings
16www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
* DIN 912 ** if a longer plug in depth is required, please call JAKOB !
Series SMA with membrane attachement
• high torsional stiffness
• whole metal version
• clamping hub on both sides
• easy installation
• disengagement mechanismcentrally placed
• 9 sizes from 5 upto 550 Nm
Safety couplings Special couplings
Series SKM for indirect drives
• low - cost - version
• with seperate sliding bearing(not included)
• automatically re- engagingper 360° - synchronous position
• with conical clamping hub
• 11 sizes from 4 upto 1.500 Nm
Series SKD / SKEwith special blocking mechanism
• re- engaging only by reverse rotation
• minimal residual torque
• with seperate sliding bearing (series SKD)or with bellow attachment (series SKE)
• with conical clamping hub
• 10 sizes from 4 upto 1.500 Nm
Special design
• high speed up to 8000 rpm
• high torque up to 3000 Nm
• customized hub versions
and dimensions
• stainless steel design
• special re- engaging functions,
e.g. for vertical drive axis
Safetycouplings
17 www.jakobantriebstechnik.de Tel. 06022 2208-0 Fax 06022 220822
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