| 摘要 |
PURPOSE:To offset a pressurizing amount, increased due to expansion of an inner ring by dint of a rotary centrifugal force and to prevent the generation of a heat and an increase in a friction moment, by a method wherein the coefficient of linear expansion of a hollow shaft is decreased over those of the inner ring, an outer ring, and a housing. CONSTITUTION:A pressurized bearing device consists of a hollow shaft 10, a housing 20, and 2 angular ball bearings 30. The coefficient of linear expansion of the hollow shaft 10 is decreased over those of an inner ring 31, and an outer ring 32, and the housing 20 by an amount by which an increase in a pressurizing amount due to expansion of the inner ring 31 and the hollow shaft 10 by dint of a rotary centrifugal force during rotation at a high speed is offset by a decrease in fit clearance due to a difference in an expansion amount between the inner ring 31 and the hollow shaft 10. As a result, utilization of a decrease in fit clearance caused along with an increase in temperature during rotation at a high speed causes prevention of an increase in pressurization due to expansion of the inner ring 31 increased along with rotation. |
