Abstract
In this paper, friction characteristics of the linear motion rolling bearing are analyzed with a locomotive multi-bristle model. The contact surface between the race and the ball are modeled with multi-bristle. Each bristles in the contact surface represents the stick and slip characteristics of the friction. The bristles locomote as the ball rotates and the state of the contact surface is updated. In the calculation of friction force, the contact surface is divided into stripes where slipping velocities between the race and the ball are constant. Firstly, distribution of the slipping velocity on the contact surface is calculated. Then, the friction forces in the each stripe are calculated with Soda's tangential force models of the contact surface. Finally, the friction force of the whole contact surface is obtained by summing the friction force of all stripes. With the suggested method, a hysterisis characteristic of the friction in the contact surface is simulated. When differential slipping is existing in the contact surface, the friction characteristics have a extreme value after the moving direction is changed. In addition, the saturation value of the friction force becomes smaller compared with the case without the differential slipping.
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