| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely prevent the wear of mutual faces even if the positional displacement in a rotation direction is generated due to the switching or the like of forward rotation and reverse rotation between a variable sheave and a cylinder which face-contact with each other, in a pulley of a belt-type continuously variable transmission.SOLUTION: A cylinder 30 of a hydraulic actuator which changes a groove width of a pulley is coupled to a rear face of a variable sheave 10 by the pressure-insertion of a pressure-insertion engagement hole 33 and an engagement part 14 of the variable sheave 10, and a joining face 35 of the cylinder 30 and an abutting face 19 of the variable sheave 10 face-contact with each other at their entire peripheries. In the cylinder 30, a diameter-expanded part 38 is extended toward a face contact region S succeeding to an oil hole 37 which is opened at a hydraulic chamber R and forms a throttle, and a communication part 39 connects a ring groove 20 adjacent to the inside of the face contact region S and the diameter-expanded part 38 along the joining face 35. A high-accuracy and proper amount of oil is smoothly supplied over an entire periphery of the face contact region S via the ring groove 20, and the wear of the abutting face 19 and the joining face 35 is prevented.</p> |
