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Ball circulating member and ball screw

A ball screw and ball technology, applied in the direction of belts/chains/gears, mechanical equipment, transmission devices, etc., can solve the problems of aggravating the wear of the ball circulation path, improve high-speed operation performance and durability, reduce the possibility, reduce The effect of small stress concentrations

Active Publication Date: 2008-12-10
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the ball circulation member 170p is made of resin, there is a concern that the wear inside the ball circulation passage will be increased.

Method used

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  • Ball circulating member and ball screw
  • Ball circulating member and ball screw
  • Ball circulating member and ball screw

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0061] First, a first embodiment of the present invention will be described.

[0062] figure 1 is an explanatory view of a side cap-type ball screw of the present invention, figure 2 yes figure 1Transverse sectional view of the important part of the ball screw, image 3 and 4 is according to figure 2 The resulting view from the direction of arrow E, image 3 shows the nuts on which the side cover has not been fastened, while Figure 4 It shows the nut after the side cover of the present invention is fixed thereon.

[0063] Such as figure 1 and 2 As shown, the ball screw 10 includes a threaded shaft 12 and a nut 14 .

[0064] The threaded shaft 12 has a spiral ball rolling groove 11 formed on its outer peripheral surface. The nut 14 has a helical ball rolling groove 13 formed on the inner peripheral surface, and the groove corresponds to the ball rolling groove 11 of the threaded shaft 12 . The nut 14 is fitted on the threaded shaft 12, and the ball rolling groo...

no. 2 example

[0085] Therefore, as a second embodiment of the present invention, a structure that can reduce stress concentration on the lifting proximal portion and can stabilize the ability to restrain the ball in the vicinity of the lifting proximal portion will be described.

[0086] The side cover 17 of the second embodiment differs from the side cover 17 of the first embodiment only in the structure of the peripheral wall extension 23f, and the other structures are the same as those of the first embodiment described above. Therefore, only the configuration of the outer peripheral wall extension 23f will be described, and descriptions of other parts and components will be omitted.

[0087] In the side cover 17 of the second embodiment, the peripheral wall extending portion 23f (the portion forming the peripheral wall) of each of the side cover forming members 23 and 23 (the parting line PL is shifted here) is extended to cover the mating The ball circulation member forms the opposite s...

no. 3 example

[0106] Next, the operations and advantages of the ball screw 10p and side cover 17p of the third embodiment will be described.

[0107] As described above, in this ball screw 10p, the side cover 17p is fixed on the side cover fixing surface 16p of the nut 14p, and each ball 15p rolling between the ball rolling grooves 11p and 13p is lifted by the ball of the side cover 17p The portion 24p is lifted in the direction of the lead-in angle of the ball rolling grooves 11p and 13p, and is smoothly led into the central passage 22p. Therefore, in this ball screw 10p, even when the lead of the ball rolling groove is as large as in the tubular recirculation type ball screw, it is difficult for the advancing direction of the ball 15p to suddenly change in the ball recirculation portion. Therefore, when the ball 15p is lifted, damage to the ball 15p and generation of noise can be suppressed. In addition, the number of ball circulation circuits is not limited to, for example, the number o...

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PUM

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Abstract

The present invention relates to a ball circulation member and a ball screw. A side cover 17 as a ball circulation member is formed by two ball circulation member forming members 23 and 23 which are divided from each other along a parting line PL along the inside of the side cover. The advancing direction of the ball 15 extends. The side cover 17 includes a ball lifter 24 for lifting the ball 15 from the passage at one end of the ball track passage 8, and a ball lifter 24 for returning the ball 15 lifted from the ball lifter 24 to the other end of the ball track passage 8. Circulation passage 27 (this passage is integral with the ball lifting portion). The side covers have notch portions 25 respectively formed at the lift-up proximal end portions 24 a and integrally connecting the ball lift-up portions 24 to the ball circulation passages 27 , respectively. The parting line PL is formed at a position where the line cuts the notch portions 25 on one side and the other side in advance.

Description

technical field [0001] The present invention relates to ball screws used in various industrial machines and the like. Background technique [0002] like Figure 10 As shown, such a ball screw 100 includes: a threaded shaft 12 having a helical ball rolling groove formed on an outer peripheral surface thereof and extending in an axial direction. A nut 14 having a helical ball rolling groove (corresponding to the ball rolling groove in the threaded shaft) formed in its inner circumference, and the nut 14 is fitted on the threaded shaft 12 . The ball rolling grooves of the nut 14 and the ball rolling grooves of the threaded shaft 12 are opposed to each other, thereby forming the ball track passage 8 therebetween. A plurality of balls 15 (serving as rolling members) are rotatably provided in the ball track passage 8 . [0003] In recent years, the ball screw of the above type has widely used a ball circulation member type, in which in order to ensure smooth circulation of the b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H25/22
CPCF16H25/2214
Inventor 大久保努林荣治梶田敏治
Owner NSK LTD