Planetary roller and lead screw pair

A planetary roller and screw pair technology, which is applied in the direction of belts/chains/gears, mechanical equipment, transmission devices, etc., can solve problems such as stagnation, rollers and nuts coming out of the axial direction, and achieve smoothness and bearing capacity. Effect of improved meshing quality and high load carrying capacity

Active Publication Date: 2013-01-30
CHINA NORTH VEHICLE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a planetary roller screw pair, which solves the problem that the roller and the nut

Method used

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  • Planetary roller and lead screw pair
  • Planetary roller and lead screw pair
  • Planetary roller and lead screw pair

Examples

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Example Embodiment

[0028] Example: The planetary roller screw pair of the present invention is adopted, wherein the normal cross-sectional shape of the nut 3 and the screw 1 using the alveolar is an isosceles right-angled triangle thread, and the normal cross-section of the roller 2 using the tooth is an arc. The nominal pitch diameter of screw 1 is 30mm, the actual pitch diameter is 29.51mm, the nominal pitch diameter and actual pitch diameter of roller 2 are both 10mm, the nominal pitch diameter and actual pitch diameter of nut 3 are both 50mm, and the three-element threads are all right-handed. The arc radius of the arc section of the roller 2 is 7.071 mm. The above planetary roller screw pair has been tested and proved that the efficiency of the star roller screw pair is more than 90%, the forward and reverse transmission is flexible, the axial clearance is 0~0.03mm, and it is used in the servo system with good accuracy and life.

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Abstract

The invention belongs to linear kinetic pairs, and particularly relates to a planetary roller and lead screw pair. The planetary roller and lead screw pair solves problems of axial releasing and jamming of an existing roller and an existing nut, the meshing quality is improved, and the difficulty in machining process is lowered. Normal sections of a nut (3) and lead screws (1) in the planetary roller and lead screw pair are in shapes of isosceles right triangles and are provided with threaded grooves, normal sections of threads of rollers (2) are arc-shaped, and circle centers of arcs of the normal sections of the threads of the rollers (2) are positioned on axes of the rollers, and actual pitch diameters of threads of the lead screws (1) are smaller than nominal pitch diameters obtained from a computational formula.

Description

technical field [0001] The invention belongs to a linear motion pair, in particular to a planetary roller screw pair. Background technique [0002] At present, the three-element thread in the existing planetary roller screw pair is usually: the three-element thread has the same direction of rotation; the thread pitch is the same; the number of nuts and screw heads is the same; The thread lead angle is the same. Three rolling elements refer to screw, roller and nut. There are 2 types of tooth shapes for the three components: such as Figure 1a As shown, the tooth shape of the axial section of the three elements is a right triangle; Figure 1b As shown, the tooth shape of the axial section of the nut and the roller is a ring, and the screw is a thread. Among them, the circular ring is the simplest, but the screw pair must contain a pair of axial thrust bearings, and the force is transmitted by the axial thrust bearings, which has defects such as low bearing capacity and non...

Claims

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Application Information

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IPC IPC(8): F16H25/22
CPCF16H25/2252
Inventor 石岳江刘娇娜苏波刘文齐刘岩松门义双蒋明军任峰李万军
Owner CHINA NORTH VEHICLE RES INST
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