Suma Precision Machinery

Features

Complete Freewheels BM… X are sealed sprag

freewheels with ball bearings and sprag lift-off

X. They are supplied oil-filled and ready for

installation.

The sprag lift-off X ensures wear-free freewheel-

ing operation when the inner ring rotates at

high speed.

The freewheels BM … X are used as:

➧ Backstops

➧ Overrunning Clutches

for applications with high speed freewheeling

operation and when used as overrunning clutch

with low speed driving operation.

Nominal torques up to 42 500 Nm.

Bores up to 150 mm.

Application example

Complete Freewheel BM 60 SX as a backstop, arranged at the end of the intermediate shaft of a spur gearbox. The freewheel is used without the radial seal rings on each side, and is lubricated by the gearbox oil. A radial holding pin engages in the keyway of the outer ring. The backdriving torque is supported by the holding pin in the stationary housing. By removing the radial holding pin, the installation can be turned in both directions in order to carry out maintenance work. With the high shaft speed in normal operation (freewheeling operation), the type with sprag lift-off X is used; the sprags work in freewheeling operation without contact and hence are wear-free.

The maximum transmissible torque is 2 times the specified nominal torque. See page 14 for determination of selection torque.

Keyway according to DIN 6885, page 1 • Tolerance of keyway width JS10.