| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently maintain thrust between a disc and a power roller by surely preventing leakage from an oil pressure chamber even in the case of the elastic deformation of an input disc. SOLUTION: Two-stage outer periphery side seal portions 40, 42 separated from each other in the axial direction are provided between the inner periphery face of a peripheral wall 21a of a hydraulic cylinder 21 and the outer periphery of a first input disc 2a. The outer periphery side seal portions 40, 42 are constructed by forming two-streak circular grooves in the inner periphery face of the peripheral wall 21a and mounting seal members such as O-rings in the circular grooves. An inner periphery side seal portion 44 is provided between a fitting cylinder 26 of the hydraulic cylinder 21 and the inner periphery of the first input disc 2a. The inner periphery side seal portion 44 is constructed by forming a one-streak circular groove in the outer periphery face of the fitting cylinder 26 and mounting a seal member such as an O-ring in the circular groove. |
