V belt type automatic transmission

Abstract

In a V belt type automatic transmission, circumferential gaps between the movable sheave part of a driving sheave and a spider is maintained constant so that the backlash between the movable sheave part and the spider is substantially zero to prevent the generation of hammering noise or to reduce the abrasion of bushings, and to maintain the ability of the movable sheave part to move axially. Guide shoes (40, 45) for guiding the movable sheave part (11) for axial sliding movement are placed in circumferential gaps between the circumference side surfaces 36 and 37 of each of the arms of a spider (15) and the guiding surfaces (32a, 32b) of each of the guiding projections (32) of the movable sheave part (11). At least one guide shoe (45) among the guide shoes (40, 45) has the shape of a wedge. The wedge-shaped guide shoe (45) is turned radially outward by centrifugal force to reduce the circumferential gap substantially to a naught. Consequently, the V belt type automatic transmission does not generate hammering noise when torque varies.

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