Planetary roller screw pair contact point solving method

A planetary roller, screw pair technology, applied in special data processing applications, geometric CAD, design optimization/simulation, etc., can solve the problem of difficulty in determining whether the contact points meet the contact conditions, collinearity, and the inability to determine the minimum axial spacing point And other issues

Pending Publication Date: 2021-01-01
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

This method is also difficult to determine the position of the contact point on the normal section
[0004] To sum up, the existing methods basically use the axial spacing between the screw and the roller as the gap and interference betwe

Method used

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  • Planetary roller screw pair contact point solving method
  • Planetary roller screw pair contact point solving method
  • Planetary roller screw pair contact point solving method

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Embodiment Construction

[0076] In order to make the object, technical solution and advantages of the present invention clearer, the embodiments disclosed in the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0077] Such as figure 1 , in this embodiment, the method for solving the contact point of the planetary roller screw pair includes:

[0078] Step 101 is to construct the unit normal vector equation of the lead screw and the unit normal vector equation of the stud.

[0079] In this example, a helix Г is drawn in the coordinate system O-XYZ:

[0080]

[0081] Among them, R—radius of rotation, P—lead, v—angle of rotation, It is also called the rotation parameter P0.

[0082] The section of the helicoid is made along the tangent direction at a certain point of the vertical helix, and the section is the normal section O'-X'Y'Z' of the helix, Y' is the tangent direction of the helix, and the angle between Z' and Z is Helix angle Th...

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Abstract

The invention discloses a planetary roller screw pair contact point solving method. The method comprises the following steps: constructing a unit normal vector equation of a screw and a unit normal vector equation of a stud; determining a parameter relationship between the independent variable of the normal section of the lead screw and the independent variable of the normal section of the stud; determining an overlapping area and an interference area of the lead screw and the stud, and reducing a search range; calculating a normal distance from each point of the curve to each point of the curved surface, and determining a minimum value corresponding to each point of the connecting curve; searching a maximum normal distance according to the determined minimum value corresponding to each point of the connection curve, and determining a unit normal vector corresponding to the maximum normal distance; and according to the maximum normal distance and the unit normal vector corresponding tothe maximum normal distance, calculating to obtain the actual contact center distance. According to the invention, human intervention is reduced, interference and gap results can be automatically given, the position of a contact point is analyzed, and the pitch diameter change distance of the lead screw or the adjustment distance of the center distance of the lead screw and the stud needing to beincreased or decreased is given.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission mechanisms, and in particular relates to a method for solving a contact point of a planetary roller screw pair. Background technique [0002] In the planetary roller screw pair, it is a very important problem to solve the contact point position between the screw and the stud, which directly affects the motion relationship and contact force between the screw and the stud, and affects the transmission accuracy of the planetary roller screw pair. , stiffness, efficiency and other related indicators and performance also have certain influences, which must be considered when designing a planetary roller screw pair. [0003] In order to study the position of the contact point, it is necessary to establish a mathematical model of the helical surface of the screw and the stud. According to the two conditions of the contact point position vectors being equal and the normal vectors collinear...

Claims

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Application Information

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IPC IPC(8): G06F30/17G06F30/20
CPCG06F30/17G06F30/20
Inventor 张兆晶侍威郑继贵黄玉平徐强
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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