Planetary differential screw-type rotational motion/linear motion converter

A differential thread, linear motion technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., can solve the problems of poor assembly performance, inability to reduce the linear displacement of the threaded shaft of the roller nut, etc. Excellent load performance

Inactive Publication Date: 2006-01-04
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional screw-type rotary-linear motion conversion device described in the above-mentioned Patent Document 1, since the planetary thread roller and the roller nut do not undergo thrust displacement relative to each other, it is not possible to reduce the number of threads corresponding to each rotation of the roller nut. The linear displacement of the axis, and the problem of poor assembly performance

Method used

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  • Planetary differential screw-type rotational motion/linear motion converter
  • Planetary differential screw-type rotational motion/linear motion converter
  • Planetary differential screw-type rotational motion/linear motion converter

Examples

Experimental program
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no. 1 example 1

[0108] Fig. 1 is a longitudinal sectional view showing a first embodiment of a planetary differential screw type rotation-linear motion conversion device of the present invention which converts the rotational motion of a roller nut into the linear motion of a threaded shaft, figure 2 It is a front sectional view showing the main part of the first embodiment with the screw shaft removed, image 3 It is a figure showing the right side (right half) and the longitudinal section (left half) perpendicular to the axis of the first embodiment, Figure 4 is the left side view of the first embodiment.

[0109] In these figures, 10 generally denotes a planetary differential screw type rotary-linear motion conversion device, and the rotary-linear motion conversion device 10 is supported by a base 16 via two columns 12 and 14 . The rotation-linear motion conversion device 10 includes a threaded shaft 20 extending along the axis 18. The threaded shaft 20 includes a threaded portion 20A wit...

no. 2 example

[0148] Fig. 7 is a longitudinal sectional view showing a second embodiment of the planetary differential screw type rotary-linear motion conversion device of the present invention which converts the rotational motion of the roller nut into the linear motion of the threaded shaft. In addition, in FIG. 7, the same components as those shown in FIG. 1 are given the same reference numerals as those in FIG.

[0149] In this second embodiment, in the large-diameter portion 20C corresponding to the threaded portion 20A of the first embodiment, the threaded portion 20A is provided only at the central portion opposite to the planetary thread roller 36 , and at both ends of the large-diameter portion 20C The external thread 22 is not provided at the top. In addition, the wheel frames 40 and 42 are the same as the case of the first embodiment, and the relative threaded shaft 20 and the roller nut 24 can rotate relatively, but they are respectively arranged to pass through the C-shaped rin...

no. 3 example

[0157] Fig. 8 is a longitudinal sectional view showing a third embodiment of the planetary differential screw type rotary-linear motion conversion device of the present invention constituted as a modified example of the first embodiment. In addition, in FIG. 7, the same components as those shown in FIG. 1 are marked with the same reference numerals as in FIG. 1, or L or R are added to the reference numerals in FIG.

[0158] The motion transforming device 10 of this third embodiment has a first motion transforming unit 10L and a second motion transforming unit 10R having the same structure as the motion transforming device 10 of the above-mentioned first embodiment, the first motion transforming unit 10L and the second motion transforming unit 10L The motion transformation units 10R are mated to each other along axis 18 while being in mirror image relationship to each other. The male screw 22L of the screw shaft 20L of the first motion conversion unit 10L, the male screw 34L of...

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Abstract

The object of the present invention is to convert a rotary motion into a linear motion more precisely than ever by utilizing the principles of a planetary gear mechanism and a differential screw. The rotary / linear motion conversion device of the present invention has a screw shaft 20, a plurality of planetary screw rollers 36 mating with the screw shaft therearound, and a roller nut 24, with the screw shaft 20 and the planetary screw rollers 36 mating with one another by threads of opposite winding directions, while the planetary screw rollers 36 and the roller nut 24 mate with one another by threads of a same winding direction, wherein the respective threads are of a common pitch, and the number of co-extending threads of either of the screw nut and the roller nut is varied from that which satisfies the condition that neither of the screw shaft nor the roller nut moves linearly relative to one another in spite of a relative rotation thereof along with rotation and revolving of the planetary screw rollers relative to the screw shaft and the roller nut with no slippage.

Description

technical field [0001] The present invention relates to a rotation-linear motion conversion device, in particular to a planetary differential thread type rotation-linear motion conversion device that converts rotation motion into linear motion. Background technique [0002] As one of screw-type rotary-linear motion conversion devices that convert rotary motion into linear motion, for example, as described in JP-A-10-196756, the following planetary screw type rotary-linear motion conversion devices are conventionally known: A shaft, a plurality of planetary threaded rollers arranged around the threaded shaft and threaded with the threaded shaft, and a roller nut surrounding the threaded shaft and the planetary threaded rollers and threaded with the planetary threaded rollers. [0003] According to such a thread type rotation-linear motion conversion device, when one of the thread shaft and the roller nut rotates, the planetary thread roller rotates, and the other of the threa...

Claims

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Application Information

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IPC IPC(8): F16H25/20F16H25/22
CPCF16H25/2252F16H25/20
Inventor 杉谷伸芳
Owner TOYOTA JIDOSHA KK
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