Patent ID: 6938508
Filing Date: 2005-09-06
Classification: F16H

Abstract:
1. A continuously variable transmission comprising: a drive clutch rotatable about a central axis and having an input shaft; a driven clutch rotatable about a central axis and having an output shaft; an endless belt disposed about the drive and driven clutches, the drive and driven clutches each being comprised of opposing sheaves including an axially stationary sheave and an axially movable sheave, each sheave having an inner face and an outer face; and a clutch ventilation system comprising, for one sheave: a central hub extending axially from the inner face of the one sheave towards the opposing sheave, the central hub including a bore that provides an air path from the outer face of the one sheave through the one sheave to the inner face of the one sheave, the bore being positioned such that the bore is progressively uncovered by the opposing sheave as the axially moveable sheave slides from a first axial position to a second axial position.