Patent ID: 7731613
Filing Date: 2010-06-08
Classification: B62K,F16H

Abstract:
1. A V-belt type continuously variable transmission comprising: first and second sheave shafts; first and second sheaves rotating with the first and second sheave shafts; and a V-belt wound around the first and second sheaves, wherein the second sheave includes a first sheave half that rotates with the second sheave shaft and is axially stationary, a second sheave half that rotates with the second sheave shaft and is axially movable, and an elastic body that biases the second sheave half with an elastic force toward the first sheave half, the first sheave half includes a sheave body around which the V-belt is wound, and a boss portion that is separate from the sheave body, arranged to abut a side surface of the sheave body and to extend in an axial direction of the second sheave shaft from the side surface of the sheave body, and to which the elastic body is directly or indirectly mounted, and the sheave body and the boss portion are each splined-fitted to the second sheave shaft, the elastic body is mounted around the boss portion with a first end thereof engaged with the boss portion and with a second end thereof engaged with the second sheave half, the second sheave half is arranged to move with respect to the boss portion in axial directions along the second sheave shaft with and against the elastic force of the elastic body, and a lock nut is threaded on the second sheave shaft with the lock nut engaged with the boss portion so that the boss portion abuts the side surface of the sheave body of the first sheave half.