Structural support of ball screw assembly

Abstract

The invention discloses a structural support of a ball screw assembly, which can ensure that the ball screw assembly is pre-stretched and a supporting bearing has a preload. The structural support comprises a base. The base is fixedly provided with a motor supporting seat and a bearing holder; the motor supporting seat is arranged at the left side of the bearing holder; the motor supporting seat is internally fixedly provided with a left end supporting bearing; the bearing holder is internally fixedly provided with a right end supporting bearing; the left end supporting bearing and the right end supporting bearing are both rotatably provided with ball screw assemblies; the ball screw assemblies are provided with left steps and right steps; the left steps are positioned at the left side of the right steps; the left ends of the ball screw assemblies extend to the left side of the left end supporting bearing; the right ends of the ball screw assemblies extend to the right side of the right end supporting bearing; the left ends of the ball screw assemblies are in transmission connection with a servo motor through a coupler; the left end of the motor supporting seat is fixedly provided with a left end cover; the left end of the external circle of the left end supporting bearing supports against the right end of the left end cover; the right end of the external circle of the left end supporting bearing supports against the motor supporting seat.

Description

technical field [0001] The invention relates to a supporting structure of a ball screw pair. Background technique [0002] As we all know, the ball screw pair is one of the key functional components of CNC machine tools. It is a mechanical element composed of screw, nut, ball and other parts. Its function is to convert rotary motion into linear motion or convert linear motion into rotary motion. . The ball screw pair is a further extension of the traditional sliding screw. The profound significance of this development is the same as the change brought by the rolling bearing to the sliding bearing. The ball screw pair is widely used in industrial equipment due to its excellent friction characteristics. , precision instruments, precision CNC machine tools and other fields. In the manufacturing process of CNC machine tools, in order to compensate for the elongation of the ball screw caused by the increase in working temperature, eliminate the axial clearance, and increase the...

AI Technical Summary

Problems solved by technology

The common feature of the above two patents is that the gap is reserved by the inner shoulder at the rear end of the screw, and the pre-tensioning amount of the screw is controlled by the rotation degree of the tightening lock nut. The disadvantage is that the inner and outer rings of the bearing at the rear end of the ball screw cannot At the same time, the axial compression will cause uneven force on the inner and outer rings of the bearing, no preload, and excessive force on the bearing, which will accelerate bearing wear, generate noise, reduce the service life of the bearing and affect the motion accuracy of the machine tool

[0004] The document "Research on the Installation Method of Ball Screws" published in "Manufacturing Technology and Machine Tools" in the 08th issue of 2007 proposed the structural installation diagram of the pre-stretching of the ball screw. The principle is that the end directly connected to the servo motor adopts a fixed installation structure. The axial clearance of the ball screw is almost zero, and the other end is compensated by an adjusting gasket. The pre-tension value is obtained through theoretical calculation of the pre-tension and deformation. It is proposed in the literature that excessive pre-tension will burn Bad support bearing, but did not propose how to preload the inner and outer rings of the bearing at the same time, its structure still uses the positioning and compression of the inner ring of the support bearing

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