| 摘要 |
PROBLEM TO BE SOLVED: To provide a small size structure capable of providing appropriate propulsion force for a pressing device 28a for providing surface pressure at a contact part between inner side surface 2a, 4a of input side and output side disks 2A, 2B, 4 and circumference surfaces 9a, 9a of power rollers 9, 9. SOLUTION: A double piston type device including a first and second hydraulic pressure chamber 73, 74 is used for the pressing device 28a. A belleville spring 72 for applying preload is assembled in the second hydraulic pressure chamber 74 on the further side from the input disk 2A. Recess grooves 82a, 82b which the belleville spring 72 is rammed against are provided on inner side surface of the second hydraulic pressure chamber 74 to smooth supply and discharge of hydraulic fluid of the second hydraulic pressure chamber 74 regardless of existence of the Belleville spring 72.
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