Modification Method of Roller Thread in Planetary Roller Screw Pair

A planetary roller and thread technology, which is applied in the field of roller thread modification in planetary roller screw pairs, can solve the problems of uneven load bearing and short service life of thread teeth, and reduce adhesive wear and contact fatigue Abrasion and life-enhancing effect

Inactive Publication Date: 2018-08-21
NORTHWESTERN POLYTECHNICAL UNIV
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the short service life of the existing planetary roller screw pair due to the uneven bearing of the thread teeth, the present invention provides a method for modifying the roller thread teeth in the planetary roller screw pair

Method used

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  • Modification Method of Roller Thread in Planetary Roller Screw Pair
  • Modification Method of Roller Thread in Planetary Roller Screw Pair
  • Modification Method of Roller Thread in Planetary Roller Screw Pair

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Embodiment Construction

[0041] refer to Figure 4-6 . The specific steps of the method for modifying the shape of the roller thread teeth in the planetary roller screw pair of the present invention are as follows:

[0042] Step 1. Analysis of the contact characteristics of the threads of the planetary roller screw pair.

[0043] Using the finite element analysis method to analyze the thread contact of the planetary roller screw pair, the load distribution of each thread tooth at the contact point between the roller 1 and the screw 2 and the nut 3, the stress distribution of each contact point and the axial direction of the contact point displacement. The results show that the load and contact stress on each thread tooth increase or decrease sharply with the increase of the thread tooth number, and the maximum modification amount of the thread tooth of roller 1 can be obtained according to the axial displacement of the thread tooth contact point. Magnitude.

[0044] Step 2, the specific process of...

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Abstract

The invention discloses a profile modification method for thread profiles of pin rollers of planetary pin roller screw pairs. The profile modification method is used for solving the technical problem that the thread profiles of the existing planetary pin roller screw pairs are short in service life because of non-uniform bearing. According to the technical scheme, contact analysis is carried out on the planetary pin roller screw pairs through software of finite element analysis on the condition of a given load, the maximum profile modification amount of the thread profiles of the pin rollers is obtained through analysis results, and the pin rollers with the profiles modified are designed according to the maximum profile modification amount. Contact analysis of finite elements is carried out on pin roller screws with the profiles modified and nuts, then loads on the thread profiles on bearing sides of the pin rollers, the screws and the nuts are effectively lowered through the pin rollers with the profiles modified on the condition that the total load is fixed, and therefore adhesive wear and contact fatigue wear of the thread profiles caused by overloads can be reduced, and the service life of the planetary pin roller screw pairs can be prolonged.

Description

technical field [0001] The invention relates to a method for modifying the thread of a roller, in particular to a method for modifying the thread of a roller in a planetary roller screw pair. Background technique [0002] refer to Figure 1-3 . The planetary roller screw pair is a mechanical transmission device that can convert rotary motion and linear motion. The basic structure of the planetary roller screw pair includes roller 1, screw 2, nut 3, ring gear 4 and cage 5. Roller 1 is a single-line thread, and in order to reduce friction, its helicoid surface is usually processed with a circular convex profile with a large contact radius. The helix angles of the roller 1 and the nut 3 are the same to ensure that the roller 1 has no relative axial displacement when rolling in the nut 3 . At the same time, in order to eliminate the tilting moment of the roller 1 caused by the helix angle of the screw 2, straight teeth are processed at both ends of the roller 1, which mesh wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23G9/00F16H25/22
CPCB23G9/00F16H25/2252
Inventor 佟瑞庭郭辉刘更张文杰王海伟马尚君李晓风
Owner NORTHWESTERN POLYTECHNICAL UNIV
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