Freewheels

An NBS freewheel is conceptually similar to a roller bearing, except that the rotational motion between the two composing rings occurs exclusively in one direction, i.e. it is one-way.

This type of function is made possible due to the special design of the rolling elements themselves, or the raceways in which they reside, which in the predetermined "free" rotational direction do not oppose the relative motion between the outer and inner rings; on the other hand, as soon as the rotational direction of these elements is inverted, the rolling elements oppose this variation and lock the system. When the system is "locked", the freewheels work as a friction element, allowing the transmission of drive/breaking torque between the shaft and the housing. 

There are essentially two types of freewheels: sprag type (DC, RSBW) and roller type (HF, HFL, NSS, NFS, AE, NFR, etc....). NBS freewheels, both sprag and roller type, have three main uses: overrunning, indexing and backstop.

Freewheels

Freewheels Range

Complete Freewheels

Complete Freewheels

  • With bearing support between inner and outer ring
  • Completely enclosed
  • With own lubrication

Low Speed Backstops

low speed backstops

  • For installations with low speeds
  • Designed for the use in inclined conveyor-belts‚ elevators or pumps

Housing Freewheels

Housing Freewheels

  • With bearing support between inner and outer ring
  • Completely enclosed by its own housing
  • With own lubrication

Basic Freewheels

Basic Freewheels

  • With bearing support between inner and outer ring
  • For assembly with connecting parts
  • Lubrication by the customer

Integrated Freewheels

Integrated Freewheels

  • Without bearing support
  • Integrating the outer ring on the customer part by bolting to the face
  • Lubrication by the customer

Internal Freewheels

Internal Freewheels
  • Series both with and without bearing support
  • Installing the outer ring in the customer’s housing with press fit or keyway connection

Cage Freewheels

Cage Freewheels

For installation between customer-supplied inner and outer rings

Irreversible Locks

Irreversible Locks

Bidirectional acting roller freewheels with bearing support

Resources

Asahi Rollway KRW RBC Bearings Shorlube koyo ubcISBTimken

Contact us about Freewheels