6 Options and Additional Features - SEW-EURODRIVEFlange couplings with cylindrical interference fit /FC Options and Additional Features 6.3 Flange couplings with cylindrical interference

116 Catalog – X.. Series Helical and Bevel-Helical Gear Units

6 Torque arm /TOptions and Additional Features

6 Options and Additional Features6.1 Torque arm /T

A torque arm is available as an option to support the force from the reaction torque (fordimensions, see page 448). The torque arm can bear tensile stress as well as thrustloads. Its length can be adjusted within a certain range.The torque arm consists of a yoke with bolt [1], a threaded bolt [2], a maintenance-freejoint head [3], and a yoke plate with bolt [4]. The joint head design compensates forassembly tolerances and operational displacements to avoid putting constraining forceson the output shaft.

To keep the bending torques on the machine shaft to a minimum, always mount thetorque arm on the same side as the machine that is driven.The torque arm can be mounted on the top or bottom of the gear unit.

60983AXX

[1][2]

Yoke with boltThreaded bolt with nut

[3][4]

Joint headYoke plate with bolt

0°

1°±1°

90°+5

°

-5°

[3][4]

[2]

[1]

INFORMATIONDo not deform the torque arm during installation. Deformation leads to constrainingforces on the output shaft, which may lower the service life of the bearings on theoutput shaft.

INFORMATIONA torque arm cannot be used together with the fan X.K.. Advanced because the fanguard mounts to the attachment point of the torque arm.

Catalog – X.. Series Helical and Bevel-Helical Gear Units 117

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Mounting flange /FOptions and Additional Features

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6.2 Mounting flange /FA mounting flange is available for gear units up to size 210 as an alternative to footmounting.A B14 flange is standard, which is fitted with external centering and retaining threads forconnection to the customer machine.

62522AXX

INFORMATION• The mounting flange can be combined with all output shaft types.

• The mounting flange cannot be used with the standard sealing system.

• Observe the limitations for hollow-shaft gear units in chapter "Gear unit mountingfor hollow shaft gear units" on page 23.

• With flange-mounted gear units, note the maximum permitted weight of the motorthat can be mounted via a motor adapter, see page 121.

• A combination of foot and flange mounting is not permitted.

• For dimensions of the mounting flange, see page 450.


6 Flange couplings with cylindrical interference fit /FCOptions and Additional Features

6.3 Flange couplings with cylindrical interference fit /FCFlange couplings [1] are rigid couplings for connecting two solid shafts [2]. They are suitable for operation in both directions of rotation, but cannot compensate forany shaft misalignment. Torque between shaft and coupling is transmitted via a cylindrical interference fit.The two coupling halves are mounted together at their flanges. The couplings areequipped with several disassembly bores [3] for removing the interference fithydraulically.

64015AXX

[2] [2][1]

[3]

INFORMATIONFor more information on the flange coupling and dimensioning for the machine shaft,see page 452.


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Backstop /BSOptions and Additional Features

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6.4 Backstop /BS

6.4.1 UseThe purpose of a backstop is to prevent undesirable reverse rotation. During operation,the backstop permits rotation in only one specified direction.

6.4.2 DescriptionThe backstop operates with centrifugal lift-off sprags. Once the lift-off speed is reached,the sprags completely lift off from the contact surface of the outer ring. The backstop islubricated with gear oil.

6.4.3 Direction of rotation

SEW-EURODRIVE installs backstops according to the specifications given with theorder. It is absolutely necessary to specify the direction of rotation for the output shaft.The customer must check that the connected electric motor rotates in the correctdirection. If not, the electric motor might damage the backstop. If the motor rotates in thewrong direction, swapping two of the motor leads changes its direction.

The direction of rotation is specified as viewed onto the output shaft (LSS):• CW = Clockwise • CCW = Counterclockwise The permissible direction of rotation [1] is indicated on the housing.

INFORMATIONFor information on the exact position, direction of rotation, and dimensions of thebackstop, see page 453

60357AXX

[1]

[1]

CWCCW

INFORMATIONIf the drive has a solid output shaft with extensions on both sides of the gear unit, thedirection of rotation should be given as viewed towards shaft position 3.


6 Backstop /BSOptions and Additional Features

6.4.4 SelectionThe backstop is selected according to the following rules:• Speed of the input shaft of the gear unit: 0... 1800 rpm• The maximum permissible torque of the backstop in relation to the output shaft

should be at least 1.8 times the nominal gear unit torque except in the cases shownin the following table.

Contact SEW-EURODRIVE for differing requirements.The backstop might wear off during operation below lift-off speed.

In the following cases always contact SEW-EURODRIVE for specifying themaintenance intervals:• Input speed rates n1 < 950 rpm• For any of the gear unit designs shown in the following table:

Size Nominal gear unit ratio iNX2F140 6.3 / 7

X2F150 8 / 9

X2F260 8

X2F280 10

X2K220 8 / 10

X2K230 9 / 11.2 / 12.5

X3F180 20

X3F230 45

X3F260 20

X3F270 22.4

X3F280 25 / 28

X3F300 56

X4F120 100

X4F130 125

X4F290 100

X4F300 112

n1 [rpm]Size

X2K.. X3K.. / X3T.. X4K.. / X4T..

950...1149 X2K100...230 iN ≥ 10X100...130X140...170X180...320

all iNiN ≥ 31.5iN ≥ 50

X120...190X200...320

all iNiN ≥ 200

1150...1400 -

X100...110X120...130X140...170X180...320

iN ≥ 25iN ≥ 40iN ≥ 50iN ≥ 63

X120...170X180...320

all iNiN ≥ 200

> 1400 - X100...130X140...170

iN ≥ 35.5iN ≥ 63

X120...130X140...250

all iNiN ≥ 200

n1 = Input speed (HSS) iN = Nominal gear unit ratio

INFORMATIONFor information on torque limiting backstops, for example for dual drives, contactSEW-EURODRIVE.


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Motor adapter /MAOptions and Additional Features

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6.5 Motor adapter /MAMotor adapters are available up to gear unit size 270.• IEC (B5) motors size 100 to 355• NEMA (C-Face) motors size 182 to 449

An elastic jaw coupling is included in the shipment of the motor adapter.All motor adapters can be equipped with a fan for two or three-stage gear units.

The diagrams below show the basic structure of the motor adapter:

INFORMATION• With sizes 260 and 270, the motor adapter is only possible in combination with the

universal housing /HU.• For dimension sheets of the motor adapters, refer to page 461.

65672AXX

[1] Motor adapter

X.K..

X.F..[1]

[1]

X.T..[1]


6 Motor adapter /MAOptions and Additional Features

6.5.1 Maximum permissible motor weight The maximum motor weight depends on the following factors. 1. Gear unit design2. Mounting position3. Motor adapter size

1. Maximum motor weight depends on gear unit design and mounting position

The following applies to all tables:GM = Motor weightGG = Gear unit weight

Horizontal gear units

Vertical gear unit

INFORMATIONThe motor weight must not exceed the GM values shown in the following tables.

INFORMATION• The following tables only apply to stationary applications. For mobile applications

(e.g. travel drives), consult SEW-EURODRIVE.• Contact SEW-EURODRIVE in case of deviating mounting conditions.

Type of mounting

Mounting position/mounting surface

M1 / F1 and M3 / F2

XF.. X.K.. X.T..

Foot-mounted version X../ B GM ≤ 1.5 GG GM ≤ 1.75 GG GM ≤ 2.0 GG

Shaft-mounted version X../ T GM ≤ 0.5 GG GM ≤ 1.5 GG GM ≤ 1.5 GG

Flange-mounted version X../ F GM ≤ 0.5 GG GM ≤ 0.5 GG GM ≤ 0.5 GG

INFORMATION• When using the shaft-mounted version, please consult SEW-EURODRIVE.• For gear units with M5 / F4 and M6 / F3, please contact SEW-EURODRIVE.

Type of mounting


M5 / F3 and M6 / F4

XF.. X.K.. X.T..




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Motor adapter /MAOptions and Additional Features

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. Upright gear units

2. Maximum motor weight depending on motor adapter size

The maximum permitted weight GM must be linearly reduced if the distance from thecenter of gravity distance X is increased. However, GM cannot be increased if thedistance is reduced.


M4 / F6

Type of mounting X.F.. X.K.. X.T..


Shaft-mounted version X../ T GM ≤ 0.75 GG GM ≤ 1.0 GG GM ≤ 0.75 GG


61569AXX

[1] Center of gravity of the motor X = Distance from the center of gravity

[2] Motor adapter GM = Weight of the motor

X

GM

[1]

[2]

INFORMATIONThe table only applies to stationary applications. For mobile applications (e.g. traveldrives), consult SEW-EURODRIVE.

Motor adapter GM X

IEC NEMA [lb] [inches]

100/112 182/184 132 7.5

132 213/215 242 9.1

160/180 254/286 484 12.2

200 324 616 13.4

225 326 880 16.5

250/280 364 - 405 1804 18.9

315S-L 444 - 449 3190 26.8

315 4400 29.1

355 5500 29.1


6 V-belt drives /VBDOptions and Additional Features

6.6 V-belt drives /VBDV-belt drives are used to adjust the total ratio or whenever the spacial constraints requirethe motor to be located above the gear unit.The standard delivery contains the following items shipped loosely: motor bracket, beltpulleys, V-belt, and a protective cover for the V-belt. As an alternative, the drive can besupplied with a motor plus all components preassembled.The following figures show the basic design of a gear unit with V-belt drive.

64014AXX

X.K..X.F..

INFORMATION• In standard design, V-belt drives cannot be combined with a fan or a mounting

flange since these options would collide with the V-belt drive.• For dimensions of the V-belt drives, refer to page 286 and page 316. More sizes

are available from SEW-EURODRIVE upon request.


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Drive packages on a steel frameOptions and Additional Features

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6.7 Drive packages on a steel frameFor gear units in a horizontal mounting position, complete preassembled drive packageson a steel frame (swing base or base frame) are available from SEW-EURODRIVE.

6.7.1 Swing base /SBA swing base is a steel frame [1] that accommodates the gear unit, (hydro) coupling,motor, brake (if required), and protection devices such as a guard, etc. A swing base isnormally used for the following:• Hollow shaft gear units• Solid shaft gear units with flange coupling on the output shaftThe steel frame [1] is supported by a torque arm [2].

Example: Swing base with coupling

INFORMATIONThe dimensions of the swing base and base frame on the dimension sheets from page514 serve for information purposes only. The final dimensions are defined by SEW-EURODRIVE for the specific order.

INFORMATION• Ensure that the steel frame is adequately designed to absorb the torque.• Ensure that the swing base is not deformed during installation to prevent damage

to gear unit and coupling.

60797AXX

[1] Swing base [4] Coupling with protection cover

[2] Torque arm (optional) [5] Motor

[3] Bevel-helical gear unit

[1]

[2]

[4] [3][5]


6 Drive packages on a steel frameOptions and Additional Features

6.7.2 Base frame /BFA base frame is typically used for solid shaft gear units with elastic coupling on theoutput shaft. It consists of a steel frame [1] that accommodates the gear unit, (hydro)coupling, motor, brake (if required), and protection devices such as guards, etc. Severalfeet [2] support the steel frame.

Example: Base frame with coupling

INFORMATION• Ensure that the support structure beneath the feet is rigid and adequately sized. • Ensure that the base frame is not deformed during installation to prevent damage

to gear unit and coupling.

60798AXX

[1] Base frame

[2] Feet

[3] Bevel-helical gear unit

[4] Coupling with protection cover

[5] Motor

[1][2]

[4] [3][5]

Documents

6 Options and Additional Features - SEW-EURODRIVEFlange couplings with cylindrical interference fit /FC Options and Additional Features 6.3 Flange couplings with cylindrical interference