| 摘要 |
PROBLEM TO BE SOLVED: To ensure power transmitting efficiency while preventing the reduction in durability of a metallic ring assembly owing to pitching of a metallic element. SOLUTION: A first clearance CLNH is formed between a project part 43f and a recess part 43r formed on back-and-forth surfaces of a metallic element 32, and a second clearance CLY is formed between an upper surface of a metallic ring assembly 31 and an ear portion bottom surface 45 of the metallic element 32. By establishing the condition of CLY>CLNH, at the time of pitching of the metallic element 32, the project part 43f and the recess part 43r are contacted first of all, thereby preventing reduction in durability caused by contacting the ear portion bottom surface 45 on the upper surface of the metallic ring assembly 31. When letting the thickness of the metallic ring assembly 31 as TL, and the vertical clearance of a ring slot 35 as D, power transmitting efficiency is decreased if the value of D/TL exceeds 11/8, so that the reduction in the power transmitting efficiency is prevented by establishing the value of D/TL less than 11/8.
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