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Planetary roller reduction gear

A technology of planetary rollers and reducers, which is applied in the direction of electromechanical devices, mechanical equipment, and control of mechanical energy, can solve problems such as micro wear and power loss, and achieve the effect of improving workability and reliability

Active Publication Date: 2010-12-29
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, bushings 104b, 104c are provided on the sun shaft 104a to suppress the lateral movement of the planetary rollers 113, but each contact portion is subjected to relative friction caused by a difference in peripheral speed, so useless power loss and micro-wear occur.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0078] The present invention describes a first embodiment of a planetary roller speed reducer according to the present invention with reference to FIGS. 1 to 6 .

[0079] The planetary roller reducer in this embodiment, as shown in Figure 1, is a reducer of the type that is directly connected (directly connected) to the output shaft 2 of the motor 1, and has a housing 6, an input shaft 3, an input side oil seal 7, an input Side ball bearing (bearing for input shaft) 20 , sun shaft 4 , bracket 8 , output side oil seal 9 , output side bearing (bearing for bracket) 23 , multiple planetary rollers 13 , and elastic ring body 5 .

[0080] The housing 6 is composed of an input side housing 6A that accommodates the input shaft 3 , and an output side housing 6 b that accommodates the planetary rollers 13 and the carrier 8 . The input shaft 3 is housed in the input side housing 6A, one end is directly connected to the output shaft 2 of the motor 1, and the other end is provided with a s...

no. 2 approach

[0107] A second embodiment of the planetary roller speed reducer according to the present invention will be described with reference to FIGS. 7 and 8 . In addition, in the first embodiment, the same reference numerals are used for the components already described, and the description thereof will be omitted.

[0108] In the planetary roller reducer of this embodiment, as shown in FIG. 7 , the input shaft 45 has an input shaft main body 46 to fix the sun shaft 4, a hub 47 connected to the output shaft 2 of the motor 1, and is flexible and connected to the input shaft. A metal bellows (connection portion) 48 of the shaft main body 46 and the hub 47 . That is, the input shaft 45 is arranged between the output shaft 2 of the motor 1 and the sun shaft 4, and connects the two bellows type shaft joints.

[0109] In this embodiment, only one input side ball bearing 20 is provided. In addition, no structure corresponding to the elastic body of the first embodiment is provided between...

no. 3 approach

[0115] According to the third embodiment of the planetary roller reducer of the present invention according to Fig. 9 and Figure 10 Be explained. In addition, the structural elements already described in the second embodiment are denoted by the same reference numerals, and descriptions thereof are omitted.

[0116] In the planetary roller speed reducer in this embodiment, as shown in FIG. 9 , the front end of the sun shaft 4 is rotatably supported by the bracket 8 . In detail, such as Figure 10 As shown, a circular hole 60 is formed in the center of the inner end surface of the bracket 8 , and an inner ball bearing (ball bearing for a sun shaft) 61 is fitted in the hole 60 so that its outer ring is connected to the inner peripheral surface of the hole 60 . And, the front end of the sun shaft 4 is fitted into the inner ring of the inner ball bearing 61 . In addition, an elastic body (second elastic member) 62 elastically supporting the sun shaft 4 with respect to the brack...

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Abstract

A planetary roller reduction gear of a type directly connected to a motor comprises a casing (6), an input shaft (3) received inside the casing and directly connected to an output shaft (2) of a motor (1), input shaft bearings (20) interposed between the casing and the input shaft and rotatably supporting the input shaft on the casing, a sun shaft (4) fitted to the input shaft, a carrier (8) received in the casing, planetary rollers (13) rotatably supported on the carrier and in external contact with the sun shaft, an elastic ring (5)received in the casing and in internal contact with the planetary rollers, and first elastic members (25a) installed between the input shaft bearings and the input shaft and elastically supporting the input shaft.

Description

technical field [0001] The invention relates to a planetary roller reducer. [0002] The present invention claims the priority of Japanese Patent (Japanese Patent Application) No. 2005-374801 filed on December 27, 2005, and is cited here but not limited to its content. Background technique [0003] A conventional planetary roller speed reducer in which rollers are driven by rolling will be described with reference to FIG. 11 . This speed reducer has: the input shaft 104 that is screwed and fitted on the output shaft 102 of the motor 101 at the same axis; the sun shaft 104a extended from the input shaft 104 and arranged at the rotation center of the speed reducer; A plurality of planetary rollers 113 arranged at equal intervals and spaced apart from each other and circumscribed to the sun shaft 104a; an elastic ring body 105 fixed on the casing 106 of the reducer and inscribed with a plurality of planetary rollers 113; fixed and rotatably supporting the planetary rollers 11...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C27/06F16C35/063F16C35/067F16D3/74F16H13/08F16H57/02H02K7/116
CPCF16C27/066F16D1/0835F16H13/06H02K7/116F16C35/073
Inventor 稻吉文雄
Owner MITSUBISHI HEAVY IND LTD
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