Cam for variable width pulley

Details Cam for variable width pulley Cam for variable width pulley

1994-03-29

1995-04-04

Buiz, Michael Powell

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

474 19, F16H 5900

Patent

active

054032407

ABSTRACT:
A cam for axially shifting the pulley faces of a variable width, torque sensing V-belt pulley in a variable speed, belt-type transmission system. The cam includes a plurality of cam lobes that extend in an axial direction at a predetermined radial distance from the pulley axis. Each cam lobe is triangular and is symmetrical about a cam lobe axis that is parallel with the pulley axis, and each cam lobe includes two cam surfaces that engage with respective cam followers to change the pulley face spacing as the load on the belt changes. The cam surfaces are convex and are in the form of circular arcs. The transmission system incorporating the cam structure is particularly suitable for vehicular use, and it provides improved performance by reducing engine overspeed upon initial acceleration and provides a smoother backshift when climbing hills.

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