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Epicycle reduction gear

A technology of planetary gear reduction and external gear, which is applied in the direction of gear transmission, transmission, belt/chain/gear, etc., can solve the problems of reducing and increasing the overall radial size of the reduction device, and achieve the effect of improving strength

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

AI Technical Summary

Problems solved by technology

However, if the diameter 22d1 or the diameter 22R1 of the axis circle of the inner pin 22 is to be increased, the dimension L2 will inevitably tend to be further reduced.
[0010] Therefore, if it is necessary to ensure a sufficient size of the dimension L2 and at the same time ensure a high strength of the root portion 22A of the inner pin 22, as a result, the radial dimension of the reduction gear as a whole may have to be further increased.

Method used

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Examples

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Embodiment Construction

[0027] Hereinafter, an example of an embodiment of the present invention will be described in detail based on the drawings.

[0028] figure 1 Is a cross-sectional view showing a planetary gear reduction gear according to an example of the embodiment of the present invention, figure 2 Is along figure 1 A cross-sectional view along the line Ⅱ-Ⅱ.

[0029] The planetary gear reduction device 40 includes an input shaft 42, three eccentric bodies 44 to 46, three external gears 51 to 53 and an internal gear 56. The external gears 51 to 53 are oscillated to oscillate the external gears 51 to 53 and the internal gears. The relative rotation component of the gear 56 is extracted as an output. This structure is basically the same as the aforementioned conventional example.

[0030] However, as figure 2 As shown, in this embodiment, the internal teeth of the internal gear 56 are constituted by a cylindrical outer pin 56B assembled in a circular arc-shaped groove 56A with one interposing one...

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Abstract

The invention provides an epicycle reduction gear which improves degree of design freedom around a main bearing of a wheel carrier, meanwhile, needs not to reduce the intensity around the main bearing and further shorten the size of radius of the epicycle reduction gear. The provided epicycle reduction gear which takes relative rotation component of external gears (51-53) and a internal gear (56) as output is provided with a pair of first and second wheel carriers (62, 64) which are arranged on both sides on axial direction of the external gears (51-53); an inner pin (pillar part) (60) which penetrates through the external gears (51-53) and connects the first and second wheel carriers (62, 64). The inner pin (60) is provided with a main body part (60B) comprising an embedded end part (60E) which is embedded in and fixed on the second wheel carrier (64) and penetrates the external gears (51-53). The axis circle diameter (ER1) of an axis (O e) of the embedded end part (60E) of the inner pin (60) is smaller than the axis circle diameter (BR2) of an axis (O b) of the main body part.

Description

Technical field [0001] This application claims priority based on Japanese Patent Application No. 2009-152816 filed on June 26, 2009. The entire content of this application is used in this specification by reference. [0002] The invention relates to a planetary gear reduction device. Background technique [0003] For example, Patent Document 1 discloses Figure 8 Planetary gear reducer shown. [0004] The planetary gear reduction device 10 includes three external gears 11 to 13 and an internal gear 14 internally meshed with the external gears 11 to 13, and has a structure in which relative rotation components of the external gears 11 to 13 and the internal gear 14 are taken out as output. [0005] When the input shaft 16 is rotated by a motor not shown, the eccentric bodies 17 to 19 integrally formed on the outer circumference of the input shaft 16 rotate. Since the outer peripheries of the eccentric bodies 17-19 are eccentric with respect to the axis of the input shaft 16, if the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H1/32
CPCF16H1/32
Inventor 为永淳杉野隆刀
Owner SUMITOMO HEAVY IND LTD
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