Product Announcement from Formsprag Clutch

Backstopping Clutches-Image

In backstopping (or holdback) applications, one race is always fixed to a stationary ground member. The function of the clutch is to permit rotation of the mechanism connected to the other race, in one direction only, and to prevent any rotation in the reverse direction at all times. Although the clutch normally overruns most of the time, it is referred to as a holdback or backstop in conveyors, gear reducers and similar equipment because its function is to prevent reverse rotation.

Considerations

  • Motor breakdown torque
  • Maximum dynamic reverse torque due to elasticity of the locked parts: elastic belts, shafts of more than 9 feet (3 meters) long
  • Range of overrunning speed
  • Number of torque applications during service life
  • Shaft diameter

Applications

  • Inclined conveyors
  • Escalators
  • Pumps
  • Gear drives
  • Fans

Special Purpose Designs
Formsprag Clutch offers the LLH, HSB and RSBW Designs as complete holdback assemblies specially designed for the unique requirements of conveyor headshafts, bucket elevators, pumps, or any other machinery where reverse rotation must be positively prevented.

Ball Bearing Supported Designs
Ball Bearing Supported Designs are self contained clutches that include ball bearings to handle axial and radial loading, as well as, seals to hold integral lubrication. From small to large torque requirements, from low to high speeds, they have applications in many industries.

Sleeve Bearing Supported Designs
Sleeve Bearing Supported Designs rely on a bronze bushing to handle radial loading of the application. Generally they are applied in applications where the speeds are higher and the torques not as large.

Bearing Envelope Designs
The innovative Bearing Envelope Designs utilize an integral bearing and lubrication for a compact package that corresponds to metric bearing series 62, 60, and 59.

Building Block Designs
Models AL and GFR, and RIZ have a modular design that offers a wide range of mounting options. A variety of cover and torque arm designs that can be assembled to the base clutch, or specially fabricated customer covers, result in mounting flexibility to meet any application.

External Bearing Required Designs
Built-in clutches that must be integrated in a housing that provides bearing support are available in a number of styles allowing virtually any customer's specialty application to be met. These clutches generally have applications in the low to medium torque and speed range.

In-Line Mounting Ball Bearing Supported Designs
Special Overrunning Clutches with extended shafts are available for use where the application calls for in-line mounting. The clutches are ball bearing supported which means they are self contained clutches that include ball bearings to handle axial and radial loading, as well as, seals to hold integral lubrication. From small to large torque requirements, from low to high speeds, they have applications in many industries. The base overrunning clutch cannot accommodate misalignment, so a coupling is always required to be mounted on the extended shaft.

 
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