| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of suppressing preload changes caused by changes in temperature in the rotation of driving. SOLUTION: An outer ring seat 20 is provided between a pair of outer rings 8a and 8b. Materials constituting the respective members are so selected that a relation βh>βs>βo is formed among a coefficient of linear expansion βs of a pinion shaft 2 and an inner ring seat 17, a coefficient of linear expansion βh of a support cylinder 13a, and a coefficient of linear expansion βo of the outer ring seat 20. Irrelevant to the changes in the driving state, this constitution can mutually offset an increase of preload based on the generation of the thermal expansion between the respective outer rings 8a and 8b and the respective inner rings 9a and 9b and a decrease in the preload based on the generation of the axial thermal expansion between the pinion shaft 2 and the inner ring seat 17 and between the pinion shaft 2 and the outer ring seat 20. |
