Abstract: The present invention pertains to a ball circulating structure for linear guide assembly. The design of the invention is composed of loading grooves on rail, the connecting passage and directional guiding lip on sliding block. The objective of the invention is to reduce steel ball's angular acceleration when steel ball circulates between connecting passage and loading passage. In addition, this invention also intends to reduce the frictional resistance and noise of steel ball near the intersection between connecting passage and loading passage. In this invention, connecting passage is tangent to loading passage. There is quite a large radius of curvature near the tangent point. Especially, the radius of curvature of the tangent point is infinite. When the profile of the groove on trail rack is arc-shaped, there is one or two deep grooves on the sides of the groove.

Abstract: A linear ball guide assembly with four rows of steel balls having high radial load capacity includes two rows of steel balls on the top forming a 60 degrees' angle in the load directions. The load directions of one row of steel balls on the top and a lateral row of steel balls on the same side form an angle of 90 degrees. Because of the design mentioned above, this new type of guide assembly can increase both radial and lateral load capacity and rigidity for downward force. This present invention also includes protrusive flanges on the side plates and the guiding blocks. The protrusive flanges can perfectly match with the spot holes at both end of the ball grooves and circulating holes. Thus, the steel ball can move smoothly in the circulation system.