Retention pin having foot for holding spring in disc brake pack reaction plate during assembly and for operating stator disc

Abstract

The invention relates to a retention pin having a foot for holding a spring in a disc brake pack reaction plate during assembly and for operating a stator disc. A friction drive arrangement includes a plurality of interleaved rotor and stator discs. An end stator disc is adjacent a reaction plate containing a plurality of cylindrical, stepped bores defining spring receptacles opening toward the end stator disc and pin guide holes opening in an opposite direction. Each receptacle contains a coil compression spring located between a bottom of the receptacle and a spring retention pin having a first end section reciprocably received in the guide hole and having a second end section defined by a large diameter foot located between an end of the spring and the end stator disc, with the foot being configured for directly engaging the end stator disc. A tool is used to retract the pins and associated springs into the associated receptacles so as to retain the springs during assembly. Excess retraction of the pins is prevented for preventing over-compression of the springs.

Description

technical field [0001] The present application generally contemplates disc clutches or brakes. Background technique [0002] Friction drive devices sometimes include helical compression springs mounted in cylindrical spring housings provided in the reaction plate of the device and having ends that bear directly against the stator discs of a disc clutch or brake. One current design of such an assembly, disclosed in U.S. Patent No. 8,500,591, issued August 6, 2013, has the disadvantage that the springs cause wear to the engaged stator disks and that the springs tend to dislodge from the springs of the reaction plates during assembly. Falling off in the receiver (currently use grease or petroleum jelly to keep the spring in the receiver). [0003] What is needed, therefore, is a disc clutch or brake assembly of the type described that does not suffer from the disadvantages noted above. Contents of the invention [0004] According to a first aspect there is provided a brake ...

AI Technical Summary

Problems solved by technology

One current design of such an assembly, disclosed in U.S. Patent No. 8,500,591, issued August 6, 2013, has the disadvantage that the springs cause wear to the engaged stator disks and that the springs tend to dislodge from the springs of the reaction plates during assembly. Falling off in the receiver (currently using grease or petroleum jelly to keep the spring in the receiver)

Images