The three-dimensional contact dynamics models were established between balls and rings based on the geometric structural equations of ring races torus. Considering the three-dimensional dynamic models between balls and cage with clearance and impact

the multibody contact dynamics model of ball bearing-crank slider mechanism was constructed. The dynamic responses of ball bearing-mechanism

such as dynamic errors

relative motion trajectories of ring center and cage center

dynamic forces

were obtained. The motion accuracy and dynamics characteristics of ball bearing-mechanism were calculated by generalized-α algorithms under different rotating speeds

radial clearances of ball bearing and pocket guide clearances of cage. The calculated results show that the constraint force

dynamic errors

relative motion trajectories of ring center

cage and ring center

force of ball bearing

impact force between balls and cage all increase with the increasing of rotating speed and radial clearance. The relative motion trajectory between cage and ring

impact force between balls and cage

skidding of balls increase with the increasing of pocket guide clearance of cage.