Large-length-diameter-ratio nut inverted planetary roller screw

A planetary roller, large aspect ratio technology, used in belts/chains/gears, mechanical equipment, transmissions, etc., can solve the problem that the structural advantages of the reversed planetary roller screw cannot be fully utilized, and the reversed planetary The nut length, thread structure parameters, and accuracy grade of the roller screw are difficult to guarantee, so as to achieve the effect of high bearing capacity, lower production cost, and strong impact resistance.

Active Publication Date: 2019-08-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the limitations of the existing thread processing technology, when the length-to-diameter ratio of the planetary roller screw nut is large (generally, when the length-to-diameter ratio is greater than 6:1), it is very difficult for ordinary machine tools to process threads, and it is difficult for thread structure parameters and precision grades. Guarantee, thereby limiting the length of the nut of the reverse planetary roller screw, and then limiting the effective stroke of the planetary roller screw, which cannot give full play to the structural advantages of the reverse planetary roller screw

Method used

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  • Large-length-diameter-ratio nut inverted planetary roller screw
  • Large-length-diameter-ratio nut inverted planetary roller screw
  • Large-length-diameter-ratio nut inverted planetary roller screw

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment one: if Figure 1-5 As shown, a large length-to-diameter ratio nut reverse planetary roller screw involved in this embodiment includes a nut a, a hexagon socket head cap screw, a cylindrical pin, an adjusting washer, a planetary roller, and a roller cage , Shaft circlip, screw, nut b and nut c, rollers, roller cages, shaft circlips and screw are all set in nut a, nut b and nut c; planetary rollers along the circumference The direction is evenly set between nut a, nut b, nut c and the screw rod, and the two ends of the planetary roller are the roller cage and the elastic retaining ring for the shaft in turn; the screw rod is coaxially set between the nut a, nut b, nut In c, the screw rod is provided with multi-head external threads, and the two ends of the screw rod are provided with involute gears; one end of nut a and nut c has flanges, and both ends of thread b have flanges, and the flanges There are threaded holes equidistantly distributed along the circu...

Embodiment 2

[0025] Embodiment two: if figure 1 , 2 As shown in and 5, a large aspect ratio nut reverse planetary roller screw involved in this embodiment, the plurality of planetary rollers are evenly arranged on the screw rod and nut a, nut b, nut Between c, a planetary thread transmission mechanism is formed; the plurality of planetary rollers are all provided with single-threaded threads that mesh with the multi-headed external threads on the screw rod, and both ends of the planetary rollers have cylindrical optical axes and involutes Gears, the optical axes at both ends of the planetary rollers are respectively connected to the inner holes of the roller cages at both ends of the planetary rollers along the circumferential direction, the gears at both ends of the planetary rollers mesh with the upper gear of the screw, and the The gear transmission ratio is the same as the number of heads of the multi-start external thread of the screw rod and the number of heads of the planetary roll...

Embodiment 3

[0027] Embodiment three: as figure 1 and 3 As shown in the present embodiment, a large length-to-diameter ratio nut reverse type planetary roller screw, the nut a, nut b, and nut c are all provided with the same number of threads as the multi-head external threads on the screw rod. Multi-start internal threads, nut a, nut b, nut c cooperate with single-start external threads of a plurality of planetary rollers to form thread pair transmission.

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Abstract

The invention provides a large-length-diameter-ratio nut inverted planetary roller screw and belongs to the technical field of planetary roller screws. For the large-length-diameter-ratio nut invertedplanetary roller screw, multiple nuts are connected through screws, so that a stroke of the planetary roller screw can be effectively increased, and the processing difficulty of a large-length-diameter-ratio nut can be lowered; rollers are uniformly distributed in a circumferential direction of a screw, and convex arch-shaped outside threads of the rollers are engaged with triangular inside threads of the nuts and triangular outside threads of the screw in a point contact manner at the same time; and bare shafts at the two ends of the rollers are installed in holes which are distributed on aroller retainer in a circumferential direction at an equal interval respectively, and gears at the two ends of the rollers are engaged with a gear on the screw, and the ratio of tooth number of the gears is equal to the ratio of thread number of the gears. The large-length-diameter-ratio nut inverted planetary roller screw has the advantages of high bearing capability, long service life, good impact resistance and the like, reduces the processing difficulty and improves the production efficiency without processing the large-length-diameter-ratio nut, is suitable for the use working condition with relatively high requirements for some mounting spaces and is liable to realize a design of an electromechanical integrated linear actuator.

Description

technical field [0001] The invention relates to a large length-to-diameter ratio nut reverse planetary roller screw, which belongs to the field of planetary roller screws. Background technique [0002] The planetary roller screw is a new type of linear motion unit. Its function is to convert the rotary motion of the driving motor into the linear motion of the servo mechanism, and at the same time convert the input torque of the motor into the axial driving force of the output mechanism. Compared with the traditional ball screw, the planetary roller screw has more thread contact points and a larger contact radius, which greatly improves its rated dynamic load and static load. Due to its outstanding advantages such as large thrust, high precision, high frequency response, high efficiency, and long life, it is widely used in precision transmission occasions such as CNC machine tools, ultra-precision instruments, optoelectronic equipment, medical equipment, and aerospace. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H25/22
CPCF16H25/2204
Inventor 解志杰古乐张传伟郑德志王黎钦赵小力
Owner HARBIN INST OF TECH
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