Ball screw rod composite set

Abstract

The present invention is a ball-screw combination device, which is mainly provided with an unmolded groove on the shoulder of the screw shaft, and a groove-shaped escape portion at the end of the screw shaft; One non-teething end of the teething groove communicates with each other, so that the nail part of the end plug can be screwed into the non-teething groove correspondingly with the axial movement of the nut; the invention can complete the assembly and cooperation of the nut, so that the nut When it is separated from the screw shaft or the nut is over-traveled, the balls are not screwed out and dropped, and there is no deflection and deformation in the running state, so as to avoid ensuring the service life of the ball screw.

Description

technical field [0001] The invention relates to a ball screw combination device, in particular to a screw shaft, which is mainly provided with an unextruded tooth groove on the shoulder of the screw shaft, and an escape cut part is provided at the end of the screw shaft, and the escape cut part and The tooth sockets communicate with each other, so that the nail portion of the end plug can be screwed into the tooth sockets correspondingly with the axial movement of the nut, so that the assembly and cooperation of the nut can be completed. Background technique [0002] At present, the rolling element return circulation of the ball screw is divided into internal circulation mode or end cover circulation mode, please refer to figure 1 As shown, it is a commonly used combination perspective view, that is, the structure in which the axial through hole of the nut is used as the return flow mode. The end plug 10 in the figure is fixed in the end plug fixing groove 201 on the end sur...

AI Technical Summary

Problems solved by technology

[0002] At present, the rolling element return circulation of the ball screw is divided into internal circulation mode or end cover circulation mode, please refer to figure 1 As shown, it is a commonly used combination perspective view, that is, the structure in which the axial through hole of the nut is used as the return flow mode. The end plug 10 in the figure is fixed in the end plug fixing groove 201 on the end surface of the nut 20, and the end plug 10 is provided with The turning path 101 of the ball 11 pushes the end plug 10 into the end plug fixing groove 201 along the axial direction of the nut 20 until the axial positioning part 102 on the end plug 10 is positioned in the end plug fixing groove 201 of the nut 20 , to limit the degree of freedom of the end plug 10 in the axial direction, and then pass the fixing screw 30 through the fixing hole 202 of the nut 20 and lock it through the locking hole 103 of the end plug 10 to limit the degree of freedom of the end plug 10 in the radial direction According to this assembly and matching method, a tooth groove 402 needs to be provided on the outer diameter of the screw shaft 40. The so-called tooth groove 402 refers to the area provided on the outer diameter of the screw shaft 40 for the rolling of the ball 11 and connected to the shoulder 401. The groove of the bearing surface 403 is used to avoid interference between the end plug 10 and the screw shaft 40, so when there is no tooth groove 402 on the outer diameter of the screw shaft 40, this assembly method is not suitable for use

[0003] The ball screw assembly method must first have teeth grooves 402 on the shoulder 401 of the screw shaft 40, so the teeth grooves 402 distributed on the outer diameter of the screw shaft 40 need to be produced by machining, which will make the screw shaft 40 The bearing surface 403 of the shoulder 401 leaves a tooth notch 404, and the structure of this tooth notch 404 will be affected by the following factors and cause the screw shaft 40 to be impractical:

[0004] One, the tooth groove 402 of the current screw shaft 40 will leave a tooth groove gap 404 on the bearing surface 403 of the screw shaft shoulder 401, causing the diameter of the bearing surface 403 to be incomplete. The two ends of 40 are installed on the bearing seat (not shown) of the machine table, and the motor of the machine table is activated to make the screw shaft 40 in a running state. The two ends of the screw shaft 40 will generate axial force load due to the rotational inertia, And this axial force load will present non-integrity factors because of the diameter of the bearing surface, resulting in the uneven distribution of the axial force load at both ends of the screw shaft 40, except that the end surface of the bearing installed on the bearing seat of the machine (not shown In addition to causing extrusion damage, the phenomenon of deflection and deformation of the screw shaft 40 during operation will directly affect the smoothness of the circulation of the return assembly, and will also reduce the service life of the ball screw, which is not in line with the economic benefits of use.

[0005] Second, when the two ends of the screw shaft 40 are installed on the bearing seat on the machine table, the nuts 20 are inserted into the screw shaft 40 and filled with balls in sequence, and are assembled manually as a ball screw, during which it is possible to The step of matching and adjustment is required. Due to the factors generated in this step, the nut 20 and the screw shaft 40 will separate or the nut 20 will over-travel, causing the ball to unscrew and drop.

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