| 摘要 |
PROBLEM TO BE SOLVED: To implement a rotation support device for a turbocharger with reduced vibrations and excellent responsive characteristic. SOLUTION: A cage 14a is made of metal having density <=5×103 kg/m3, and is built in a ball bearing supporting a rotation shaft. The cage 14a has width w in an axial direction of 1.3 to 1.8 times of the width of an outer diameter d of a ball 13, and has thickness t in a diameter direction of 0.15 to 0.42 times of the thickness of the outer diameter of the ball 13. If necessary, heat conductivity of the cage 14a is regulated in a range of 5 to 220 W/(m. deg.C). As a result, lubricity and cooling performance of the ball bearing 25 are improved to attain the purpose, while reducing resistance against rotations of the ball bearing 25. |
