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Planetary roller screw pair contact point solving method

A planetary roller and contact point technology, which is applied in the field of contact point solution of space point contact transmission mechanism, can solve the problems of complex solution process and many unknown variables of equations, and achieves the effect of improving calculation efficiency and reducing complexity.

Pending Publication Date: 2022-03-04
BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing methods for solving contact points are mostly based on the surface equations established by the cross-sectional contours of the shafts of each part, and the solution is based on the same spatial coordinates of the screw and the roller at the contact point and the collinear conditions of the normal vectors, so that the unknown variables in the equations are relatively small. Many, the solution process is complicated

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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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Experimental program
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Embodiment 1

[0113] According to the structural parameters of the planetary roller screw pair listed in Table 1, the solution accuracy e=5 is set, and the theoretical pitch diameter of the lead screw and the side contact parameters of the roller screw screw calculated by the method of the present invention are listed in Table 2. .

[0114] Table 1 Structural parameters of planetary roller screw pair

[0115] parameter screw roller nut Nominal radius r i / mm

15 5 25 number of heads n i

5 1 5 Pitch p i / mm

1 1 1 Tooth half angle β i / °

45 45 45 Normal section profile radius r T / mm

- 7.0711 -

[0116] Table 2 Calculation results of contact parameters of planetary roller screw pair

[0117]

[0118] From the calculation results of the contact parameters, it can be seen that the unit normal vectors of the screw and the roller at the contact point are very close to collinear and reverse, and the contact gap (the...

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Abstract

The invention discloses a planetary roller lead screw pair contact point solving method, which comprises the following steps of: firstly, establishing a spiral curved surface equation of a lead screw and a roller based on a part thread method section profile, obtaining a unit normal vector of any point of a spiral curved surface, and secondly, establishing a constraint equation set according to a collinear condition of the unit normal vector at the lead screw and roller contact point, finally, a Newton-Raphson iterative algorithm with second-order convergence is used for accurately and efficiently solving the theoretical pitch diameter of the lead screw under the non-interference condition and the contact point position at the moment, and a foundation is laid for follow-up research.

Description

technical field [0001] The invention belongs to the technical field of mechanical transmission mechanisms, and relates to a method for solving contact points of space point contact transmission mechanisms such as planetary roller screw pairs. Background technique [0002] The planetary roller screw pair transmits the load through the contact between the thread surface. For the standard planetary roller screw, on the roller screw side, because the helix angle of the screw is inconsistent with the roller, the contact between the two Points can shift, causing interference problems during assembly. In the actual processing and assembly process, the axial distance between the screw and the roller is usually kept constant, and the interference is avoided by adjusting the pitch diameter of the screw. Therefore, the determination of the theoretical pitch diameter of the lead screw and the accurate solution of the contact point position are very important for subsequent research and...

Claims

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Application Information

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IPC IPC(8): G06F30/17F16H25/22G06F111/04
CPCG06F30/17F16H25/2247F16H25/2252G06F2111/04
Inventor 陈中郑继贵侍威黄玉平张兆晶郭亚星杨斌田青
Owner BEIJING RES INST OF PRECISE MECHATRONICS CONTROLS