| 摘要 |
PROBLEM TO BE SOLVED: To prevent the lowering of shift control precision and lowering of control performance due to leakage of a control fluid pressure even when a piston slide part is widely inclined simultaneously with deformation of a trunnion. SOLUTION: A lower part 78c1of a piston boss part 78c is formed in a state to be decreased in diameter compared with the outside diameter of an upper piston boss part 78c. The lower part 78c1 is loosely inserted with a given gap (t) between the lower part and the lower inner peripheral surface of a lower boss part insertion hole 60d. A trunnion to support a power roller is deformed around a position, serving as a fulcrum, where it is coupled to an upper link and a lower link 52 as a result of a thrust force F being applied. Even when the lower end 78c2 of the piston boss part 78c is widely inclined therealong, since the lower part of the piston boss part is loosely inserted with a given gap (t) being provided between the lower part of the piston boss part and the lower inner peripheral surface of the lower boss part insertion hole, the lower part 78c1 is prevented from interference with the inner peripheral surface of the lower boss part insertion hole 60d.
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