| 摘要 |
PROBLEM TO BE SOLVED: To prevent damage of a cage 31 and respective inner race-outer race tracks 27 and 29 for constituting a thrust ball bearing 26 for supporting a power roller without reducing transmission efficiency. SOLUTION: When density of a cage material fore constituting this cage 31 is set to p<SB>d</SB>, an elastic modulus of this cage material is set to E<SB>d</SB>, density of a rolling body material for constituting respective balls (a rolling body) 30 and 30 is set to p<SB>c</SB>, and an elastic modulus of this rolling body material is set to E<SB>c</SB>, ä(p<SB>d</SB>x E<SB>d</SB>)/(p<SB>c</SB>x E<SB>c</SB>)}<SP>1/2</SP>≤0.6 is satisfied. This constitution prevents damage of respective parts by restraining collision force generated between the balls 30 and the cage 31 even when increasing clearance between an inside surface of a pocket 36 of the cage 31 and a rolling surface of the balls 30. COPYRIGHT: (C)2004,JPO
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