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Pre-tightening force adjusting mechanism of double-nut ball screw and double-nut ball screw

A technology of pre-tightening force adjustment and ball screw, which is applied to mechanical equipment, belts/chains/gears, transmission devices, etc. It can solve problems such as unsmooth operation, uncontrollable pressing force of pre-tightening blocks, and small contact surface. It achieves the effect of simple and reliable adjustment of pretightening force, avoiding stress concentration and large contact area

Pending Publication Date: 2022-04-19
NSK CHINA RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in Patent Document 1, there are still the following problems: (1) The contact surface between the wedge-shaped preload block and the nut is small, and the stress concentration on the contact part between the preload block and the nut in actual use will cause damage to the preload block; (2) When the compression strip squeezes the pretension block inward, the compression force acting on each pretension block is uncontrollable, and it is difficult to ensure that the radial movement of each pretension block is consistent, which will cause the two nuts to be deflected , the operation is not smooth; (3) There is a gap between the two nuts, and the inner cavity of the two nuts is exposed to the outside through the gap, and the dustproof performance is poor; (4) The structure between the two nuts protrudes from the outer diameter surface of the nut, and it will be in contact with the nut during installation. The nut seat will interfere, which is not conducive to installation and use

Method used

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  • Pre-tightening force adjusting mechanism of double-nut ball screw and double-nut ball screw
  • Pre-tightening force adjusting mechanism of double-nut ball screw and double-nut ball screw
  • Pre-tightening force adjusting mechanism of double-nut ball screw and double-nut ball screw

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no. 1 Embodiment approach

[0045] First, the double-nut ball screw according to the first embodiment of the present invention will be described. figure 1 It is a schematic diagram which shows the basic structure of the double nut ball screw which concerns on 1st Embodiment of this invention. like figure 1 As shown, the double-nut ball screw 100 mainly includes a screw shaft 1, a main nut 2 and an auxiliary nut 3 sleeved on the screw shaft 1, and a main nut 2, an auxiliary nut 3 and a screw shaft 1 arranged between the main nut 2 and the auxiliary nut 3. Multiple balls not shown.

[0046] In order to adjust the preload force of the double nut ball screw 100, a preload force adjustment mechanism is provided. The pre-tightening force adjustment mechanism of this embodiment does not need to replace the steel balls during the pre-compression adjustment process, and the pre-tightening force can be adjusted by directly adjusting the gap between the main nut and the auxiliary nut by using the feeding mechanis...

no. 2 Embodiment approach

[0063] Next, refer to Figure 7 and Figure 8 A double nut ball screw according to a second embodiment of the present invention will be described. Figure 7 It is a figure which shows the basic structure of the double nut ball screw of 2nd Embodiment of this invention, Figure 8 Yes Figure 7 Sectional view of the W section.

[0064] In the second embodiment, as in the first embodiment, the preload can be adjusted by directly adjusting the gap (relative axial distance) between the main nut and the auxiliary nut by using the feed mechanism without replacing the steel balls during the adjustment of the preload. Here, about the same structure as 1st Embodiment, the same code|symbol is attached|subjected and description is abbreviate|omitted.

[0065] In the second embodiment, as the preload adjustment mechanism of the double nut ball screw, such as Figure 7 , Figure 8 As shown, a threaded portion 10 is provided at the end of the sub nut 3 opposite to the main nut 2 . In ...

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Abstract

The pretightening force adjusting mechanism is simple and reliable in pretightening force adjusting mode, the double-nut ball screw comprises a screw shaft, a main nut, an auxiliary nut and a plurality of balls, the main nut and the auxiliary nut are arranged on the screw shaft in a sleeving mode, and the balls are arranged between the main nut and the screw shaft and between the auxiliary nut and the screw shaft. A pretightening force adjusting mechanism for a double-nut ball screw is provided with: a pretightening part provided between a primary nut and a secondary nut so as to surround a screw shaft, the pretightening part having a first end surface and a second end surface; and a feed mechanism which is rotatably operated, and which, by operating the feed mechanism, causes the pre-tightening part to generate a displacement in which at least one of the first end surface and the second end surface pushes against at least one of the main nut and the sub-nut to increase the distance between the main nut and the sub-nut.

Description

technical field [0001] The invention relates to a double-nut ball screw, more particularly, to a pre-tightening force adjusting mechanism of the double-nut ball screw. Background technique [0002] At present, for precision ball screw pair transmission, in addition to a certain one-way feed accuracy, the axial clearance should also be strictly controlled, otherwise, backlash error will occur when reverse rotation occurs. In order to eliminate the backlash error caused by the axial play, a double-nut ball screw is usually used and the preload is adjusted. [0003] As a commonly used method for adjusting the preload, there is a method of adjusting the size of steel balls (balls). Specifically, first, the size of the steel balls is preselected based on experience to adjust both nuts (hereinafter also referred to as main and auxiliary nuts) , and then assemble. The preload of the double nut ball screw is determined indirectly by the friction torque. After the assembly is comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22F16H25/24
CPCF16H25/2209F16H25/24F16H2025/2445
Inventor 王耀玮张俊孙金辉张凤霞
Owner NSK CHINA RES & DEV CO LTD
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