| 摘要 |
<P>PROBLEM TO BE SOLVED: To secure sealing performance by suppressing abrasion of a sealing member even when a gap between a movable sheave and a cylinder forming a hydraulic pressure chamber at the back surface of the movable sheave changes and the sealing member deforms periodically in a belt type continuously-variable transmission. <P>SOLUTION: A gap between the movable sheave and the cylinder is sealed by mounting a seal ring 50 having a rectangular cross section on the radially outward side and an O ring 52 having a circular cross section on the radially inward side. Of the four corners of the seal ring 50, the two corners on the side where it is in contact with the O ring 52 are chamfered. Due to this, even when the O ring 52 is periodically crushed accompanying the deformation of a pulley and the cylinder by the belt, it is possible to cause the O ring 52 to flow into a V-shaped groove formed between a sidewall of a ring groove 38a and a side surface of the seal ring 50 as a result of the chamfering, and therefore, it is possible to suppress the occurrence of dragging abrasion in the O ring 52. <P>COPYRIGHT: (C)2012,JPO&INPIT |
