Threaded tooth profile design method for planetary roller screw
A technology of planetary rollers and design methods, applied in design optimization/simulation, calculation, mechanical equipment, etc., can solve problems such as edge meshing
Inactive Publication Date: 2017-05-10
BEIHANG UNIV
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Problems solved by technology
[0005] In order to reduce the problem of edge meshing between the roller and the lead screw with a circular thread profile, this patent provides a design method for the thread tooth shape of the planetary roller screw. In this design method, the roller The tooth shape of the thread is elliptical. Since the elliptical thread will make the meshing radius of the roller and the screw during the meshing process, the meshing radius is closest to the pitch diameter of the screw and the roller, and the meshing deflection angle of the screw and the roller is the smallest. The characteristic is better than that of arc thread, its meshing radius is stable, and the meshing area is concentrated near the lead circle, which can avoid edge meshing
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[0088] The present invention relates to a planetary roller screw and its thread tooth shape design method, such as Figure 14 As shown, its implementation steps are as follows:
[0089] Step 1: Create a coordinate system, such as figure 1 As shown in , draw the roller elliptical profile tooth profile curve, for the convenience of calculation, it is advisable to take the vertical axis as the roller central axis, that is, H cx =0. Then the expression of the elliptic contour curve is:
[0090]
[0091] Wherein, the "H" described in step 1 cx "is the distance from the center of the ellipse to the x coordinate axis; "H cz " is the distance from the center of the ellipse to the z coordinate axis; "a and b" are the semi-major and semi-minor axes of the ellipse, respectively.
[0092] Step 2: Establish the straight line equation y=x and the ellipse equation Liaison, such as figure 2 shown, and taking b=k*a, k as the proportional coefficient, and 0 Different values of k c...
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The invention provides a threaded tooth profile design method for a planetary roller screw. The method includes the following steps that (1), a roller elliptical figure tooth profile curve is drawn; (2), the relationship among a, b and r_mr is deduced; (3), meshing point calculation is performed through MATLAB software; (4), the optimal k value is sought, and meshing points of the screw and a roller are all made to be at the most ideal positions; (5), the value of the a, the value of the b and the thread-form half angle beta value are calculated out; (6), concepts of parameters of all parts and sizes of the roller tooth profile are solved; (7), a screw straight line figure tooth profile curve is drawn; (8), interference in the meshing process is eliminated; (9), contents of parameters of all parts and sizes of the screw tooth profile are solved. By means of the above steps, a planetary roller screw mechanism with the roller thread tooth profile curve being oval and a screw thread tooth profile curve being a straight line can be designed, the size of the meshing radius is stable, the meshing area is concentrated near a lead circle, the defect that a planetary roller screw mechanism with the roller being an arc thread generates edge meshing easily is overcome, meshing capacity can be improved, and bearing capacity is improved.
Description
technical field [0001] The invention relates to a thread tooth shape design method of a planetary roller screw and provides a preferred tooth shape, which belongs to the technical field of precision mechanical transmission. Background technique [0002] With the improvement of requirements for higher precision, faster speed and higher bearing capacity in modern mechanical transmission mechanisms, the traditional ball screw transmission mechanism can no longer meet the requirements. A new type of screw transmission mechanism has emerged in recent years. ——Planetary roller screw mechanism, including outer nut, multiple planetary rollers and lead screws, etc. The thread of the planetary roller screw is engaged with the internal thread of the nut at the same time, thereby converting the rotary motion into a linear motion. [0003] The screw shaft adopts a thread with a small lead angle, which is beneficial to achieve small lead and high lead accuracy, and can realize micro-feed...
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IPC IPC(8): F16H25/24G06F17/50
CPCF16H25/24G06F30/17G06F30/20
Inventor 刘艳强尚宇王建珅
Owner BEIHANG UNIV