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BM series

Product catalog summary

Overview
Complete Freewheels BM are mechanical components used in various applications such as backstops, overrunning clutches, and indexing freewheels. They are designed for keyway connections on the outer ring and are available with rollers or with sprag lift-off X for wear-free operation at high speeds.

Specifications
These freewheels are sealed units with ball bearings, supplied oil-filled and ready for installation. They support nominal torques up to 57,500 Nm and bores up to 150 mm. A variety of standardized bore diameters are available with short delivery times.

Features
The standard type is suitable for universal use, while the type with sprag lift-off X is designed for extended service life by allowing sprags to lift off at high-speed rotating inner rings, reducing wear.

Application Example
An example application is the use of a Complete Freewheel BM 60 SX as a backstop in a spur gearbox. It is lubricated by gearbox oil and uses a radial holding pin to engage the keyway of the outer ring, supporting backdriving torque in the stationary housing.

Technical Data
The document provides a detailed table listing various freewheel sizes, types, nominal torques, and maximum speeds for both inner and outer ring operations. It also includes dimensions and weights for each size.

Mounting Instructions
The customer must connect the attachment part via a keyway connection with the outer ring, providing the necessary key. Shaft tolerance must be ISO h6 or j6, and the pilot diameter D tolerance must be ISO H7 or J7.

Ordering Information
For ordering, specify the freewheel size, type, and bore diameter. Freewheels with bore diameters highlighted in blue in the table are available with short delivery times. The maximum transmissible torque is twice the specified nominal torque.

Catalog excerpts

Complete Freewheels BM for keyway connection on the outer ring with rollers or with sprag lift-off X Application as ➧ Backstop ➧ Overrunning Clutch ➧ Indexing Freewheel Features Complete Freewheels BM are sealed freewheels with ball bearings. They are supplied oil-filled and ready for installation. Besides the standard type, the type with sprag lift-off X is available for wearfree freewheeling operation at high speed rotating inner ring. Nominal torques up to 57 500 Nm. Bores up to 150 mm. A multitude of standardized bore diameters are available with short delivery times. 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.

Open the catalog to page 1

Complete Freewheels Overrunning Clutch ■ Freewheels with bore diameters highlighted blue in the table are available with short delivery times. 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. Mounting The customer attachment part is connected via a keyway connection with the outer ring. The customer must provide the key required for assembling the attachment part. The tolerance of the shaft must be ISO h6 or j6 and the tolerance of the pilot diameter...

Open the catalog to page 2

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.

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