초록 ▼

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 th

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.

대표청구항 ▼

1. A V belt type automatic transmission comprising:a driving shaft; a driving sheave mounted on the driving shaft; a driven shaft; a driven sheave mounted on the driven shaft; a V belt wound around the driving sheave and the driven sheave; and a driving sheave thrusting mechanism for moving the driv

1. A V belt type automatic transmission comprising:a driving shaft; a driving sheave mounted on the driving shaft; a driven shaft; a driven sheave mounted on the driven shaft; a V belt wound around the driving sheave and the driven sheave; and a driving sheave thrusting mechanism for moving the driving sheave on the driving shaft; said driving sheave including a fixed sheave part mounted on the driving shaft and restrained from axial movement and rotation relative to the driving shaft, and a movable sheave part axially movably put on the driving shaft; said driving sheave thrusting mechanism including flyweights supported for turning on the movable sheave part, and a spider having parts in contact with the flyweights, fixedly mounted on the driving shaft, restrained from axial movement and rotation relative to the driving shaft and capable of transmitting torque of the driving shaft to the movable sheave part; and guide shoes being placed in circumferential gaps between the spider and engaging parts of the movable sheave part, respectively, to guide the movable sheave part for axial movement relative to the spider, and the guide shoes include a wedge-shaped guide shoe.