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Planetary roller screw assembly

A planetary roller and screw pair technology, applied in the direction of belts/chains/gears, mechanical equipment, transmission devices, etc., can solve the problem that the axial gap between the roller and the screw cannot be completely eliminated, and achieve the goal of eliminating the axial gap Effect

Inactive Publication Date: 2012-09-19
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the existing roller screw pair cannot completely eliminate the axial gap between the roller and the screw during the gap adjustment process, the present invention provides a planetary roller screw pair

Method used

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  • Planetary roller screw assembly
  • Planetary roller screw assembly
  • Planetary roller screw assembly

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Embodiment Construction

[0022] refer to Figure 1~5 , The planetary roller screw pair of the present invention includes a screw 1, a roller 2, a nut 3, a cage 4, a gap adjustment ring 6 and a gap adjustment screw 7. Among them, the lead screw 1, the roller 2 and the nut 3 have the same pitch, and the nut 3 has multi-thread threads, the tooth shape is triangular, and the tooth angle is 90°; the external thread of the lead screw 1 is the same as the internal thread of the nut 3. The number of heads and tooth type; the roller 2 is a single-start thread, and the side surface of the thread is designed to be arc-shaped, so that the contact between the roller, the nut and the screw is a point contact. The cage 4 is an annular structure with a thickness of 3-5mm, and has the same number of holes as the rollers 2 to fix the shaft ends of the rollers 2. The nut 3 is made of high-strength alloy steel, and the pre-processing technology is consistent with the traditional structure. After the thread of the nut 3...

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Abstract

The invention discloses a planetary roller screw assembly which is used for solving the technical problem that the axial clearance between a roller and the screw in the existing roller screw assembly cannot be eliminated thoroughly in the clearance regulating process. The technical scheme is as follow: a nut (3) is provided with a straight groove in an axial direction and is provided with a clearance regulating ring (6) and a clearance regulating screw (7); the clearance regulating ring (6) is in an opening ring-shaped structure of which the inner diameter is the same as the outer diameter of the nut (3); the clearance regulating ring (6) is arranged on the middle part of the nut (3), and the openings of the clearance regulating ring and the nut (3) correspond; and the clearance regulating screw (7) is inserted from the side of an unthreaded hole of a lug of the clearance regulating ring (6) and is screwed in the side of the screw hole of the lug. By adopting the design of the clearance adjusting ring and the axial straight groove of the nut, the outer diameter of the nut is changed by adjusting the screw-in depth of the clearance adjusting screw on the clearance adjusting ring, so that the engaged position between the nut and the roller and the engaged position between the roller and the screw are changed, thereby the axial clearance between the roller and the screw is eliminated thoroughly.

Description

technical field [0001] The invention relates to a roller screw pair, in particular to a planetary roller screw pair. Background technique [0002] refer to Figure 6-9 , the document "Roller Screw, "Modern Manufacturing", No. 25, 2003, No. 286 P62-63 in total" discloses a roller screw pair, which includes a screw 1, a roller 2. Nut 3, cage 4 and elastic element 5, lead screw 1, roller 2 and nut 3 have the same pitch, nut 3 has multi-threaded teeth, the tooth shape is triangular, and the tooth angle is 90°; the lead screw The external thread of 1 and the internal thread of nut 3 have the same number of starts and tooth type; the roller 2 is a single-start thread, and the flank of the thread is designed to be arc-shaped, so that the contact between the roller, the nut and the screw is point contact. During assembly, the roller 2 surrounds the lead screw 1 evenly, and the two ends of the roller 2 are restrained by the cage 4 . The threads of the two symmetrical split nuts 3 c...

Claims

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Application Information

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IPC IPC(8): F16H25/22F16H25/24
Inventor 刘更关栋杨小辉佟瑞庭马尚君刘岚吴立言王海伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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