Pure Rolling Contact Fatigue Life Tester for Balls with Three Point Contact

A new pure rolling fatigue life tester of balls with three point contact is developed,which mainly consists of driving device,driven device and loading device,and the temperature,vibration and the running times are respectively measured by thermal couple,acceleration transducer and counter in additive device.The tested ball is endured by circle loads which are of equal intension,but not equal spacing at the maximal same cross-section,and it is pure rolling at the circle,the maximum speed of the ball is 23 000 r/min,maximum hertz' contact stress is 7 GPa.The tester may be used to evaluate contact fatigue performances of balls made of various materials.