The Function of Torque Arm for Hollow shaft Gearbox

The torque arm is a connecting link between the reducer and a fixed point intended to resist the torque developed by the gearbox, transmitting the reaction torque produced by the gearbox, and preventing the counter-rotation of the gearbox during operation.

The function of torque arm is to support the reaction torque of hollow shaft gear units in the shaft-mounted version.

The torque can bear tensile stress as well as thrust loads. The length of the torque arm can be adjusted within a certain range.Do not place the torque arm under strain during installation. Strain leads to constraining forces on the output shaft, which may negatively influence the service lift of the output shaft bearings.
To keep the bending moment on the machine shaft as low as possible, the torque arm must always be mounted 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.
Gearboxes that are shaft mounted can use a torque arm, (or reaction arm) to maintain gearbox positioning.
torque arm gearbox

KAT series hollow shaft helical bevel geared motor with torque arm mounted

Torque Arm for KAT Hollow Shaft Helical Bevel gearbox

Torque Arm for KAT Hollow Shaft Helical Bevel gearbox

Torque arm for helical bevel gear unit

Torque arm for hollow shaft helical bevel gear unit

Helical Bevel Gear Unit Bolts Tightening Torque
KAT37 hollow shaft gearbox with torque arm mounted 4 x M10 x 25 -8.8 48 N.m (425 lb-in)
KAT47 hollow shaft gearbox with torque arm mounted 4 x M10 x 30 -8.8 48 N.m (425 lb-in)
KAT67 hollow shaft gearbox with torque arm mounted 4 x M12 x 35 – 8.8 86 N.m (761 lb-in)
KAT77 hollow shaft gearbox with torque arm mounted 4 x M16 x 40 – 8.8 210 N.m (1858 lb-in)
KAT87 hollow shaft gearbox with torque arm mounted 4 x M16 x 45 – 8.8 210 N.m (1858 lb-in)
KAT97 hollow shaft gearbox with torque arm mounted 4 x M20 x 50 – 8.8 410 N.m (3628 lb-in)
KAT 107 hollow shaft gearbox with torque arm mounted 4 x M24 x 60 – 8.8 710 N.m (6283 lb-in)
KA127 hollow shaft gearbox with torque arm mounted 4 x M36 x 130 – 8.8 2500 N.m (22125 lb-in)
KA157 hollow shaft gearbox with torque arm mounted 4 x M36 x 130 -8.8 2500 N.m (22125 lb-in)
SAT series Hollow Shaft Worm Gearmotor with Torque Arm

SAT series hollow shaft worm gearmotor with torque arm

Torque Arm for SAT worm gearbox

SAT series hollow shaft worm gearmotor with torque arm

Torque arm for worm helical geared motors

Torque arm for worm helical gearbox

Hollow Shaft Worm Helical Gear Unit Bolts Tightening Torque
SAT37 hollow shaft gearbox with torque arm mounted M6 x 16 – 8.8 11 N.m (97 lb-in)
SAT47 hollow shaft gearbox with torque arm mounted M8 x 20 – 8.8 25 N.m (222 lb-in)
SAT57 hollow shaft gearbox with torque arm mounted M8 x 30 – 8.8 25 N.m (222 lb-in)
SAT67 hollow shaft gearbox with torque arm mounted M12 x 25 – 8.8 86 N.m (761 lb-in)
SAT77 hollow shaft gearbox with torque arm mounted M12 x 35 – 8.8 86 N.m (761 lb-in)
SAT87 hollow shaft gearbox with torque arm mounted M16 x 35 – 8.8 210 N.m (1858 lb-in)
SAT97 hollow shaft gearbox with torque arm mounted M16 x 35 – 8.8 210 N.m (1858 lb-in)

The design of the torque arm mounted hollow shaft mounting system makes for simple assembly and significantly improves removal of the drive even after lengthy periods of operation. We deliver the drive with the bushing matching the respective diameter. The customer installs the clamping ring on the customer shaft and the drive can be mounted and fixed easily.