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Wave gear device

A technology of wave gear device and external gear, applied in the direction of transmission device, transmission device parts, hoisting device, etc., can solve problems such as offset

Pending Publication Date: 2020-11-10
NABLESCO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, there is a problem that the flexible external gear deforms in the radial direction due to an excessive load and skips teeth relative to the rigid internal gear (the meshing position between the internal teeth and the external teeth deviates unexpectedly)

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0043] Such as Figure 1 ~ Figure 3 As shown, the wave gear device 1 of the first embodiment includes a rigid internal gear 2 , a flexible external gear 3 meshing with the rigid internal gear 2 , and a wave generator 4 that flexibly deforms the flexible external gear 3 . In addition, the wave gear device 1 of the first embodiment includes a bearing 5 .

[0044] The rigid internal gear 2 is formed in a ring shape. The rigid internal gear 2 has internal teeth 21 on its inner peripheral surface. A plurality of internal teeth 21 are arranged along the circumferential direction. The rigidity of the rigid internal gear 2 is higher than the rigidity of the flexible external gear 3 described later. The rigid internal gear 2 has, for example, such rigidity that it does not deform even if it receives an external force.

[0045] The flexible external gear 3 is formed in a cylindrical shape. The flexible external gear 3 is disposed inside the rigid internal gear 2 . The flexible exter...

no. 2 approach 〕

[0071] Next, refer to Figure 4 A second embodiment of the present invention will be described. In the second embodiment, the same reference numerals are attached to the same components as those in the first embodiment, and descriptions thereof are omitted.

[0072] Such as Figure 4 As shown, a wave gear device 1A of the second embodiment includes a rigid internal gear 2 , a flexible external gear 3 , a wave generator 4 , and a bearing 5A similarly to the first embodiment. The number of wave generators 4 may be plural as in the first embodiment, but may be one, for example.

[0073] A bearing 5A of the second embodiment includes a plurality of rolling elements 51 and a cage 52A. Similar to the first embodiment, a plurality of rolling elements 51 are arranged along the circumferential direction between the inner circumference of the flexible external gear 3 and the outer circumference of the wave generator 4 . The cage 52A maintains a gap in the radial direction between th...

no. 3 approach 〕

[0095] Next, refer to Figure 5 A third embodiment of the present invention will be described. In the third embodiment, the same reference numerals and the like are assigned to the same constituent elements as those in the first embodiment, and description thereof will be omitted.

[0096] The wave gear device of the third embodiment includes the same rigid internal gear 2, flexible external gear 3, and wave generator 4 as those of the first embodiment (see Figure 1 ~ Figure 3 ), and includes Figure 5 Bearing 5B is shown. The number of wave generators 4 may be plural as in the first embodiment, but may be one, for example.

[0097] The bearing 5B is provided between the inner circumference of the flexible external gear 3 and the outer circumference of the wave generator 4 similarly to the bearing 5 of the first embodiment.

[0098] The bearing 5B of this embodiment includes a first rolling element group 501 and a second rolling element group 502 . The first rolling elem...

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Abstract

The invention provides a wave gear device. The strain wave gear device includes: an annular rigid internal gear having internal teeth on an inner circumferential surface thereof; a flexible external gear which is disposed on the inside of the rigid internal gear and has external teeth capable of meshing with the internal teeth on the outer peripheral surface thereof; a first wave generator that engages the outer teeth with the inner teeth by bending the flexible outer gear in the radial direction, and that moves the engagement position between the outer teeth and the inner teeth in the circumferential direction; and a second wave generator that engages the outer teeth with the inner teeth by bending the flexible outer gear in the radial direction, and that moves the engagement position between the outer teeth and the inner teeth in the circumferential direction.

Description

technical field [0001] The present invention relates to a wave gear device. Background technique [0002] A wave gear device may be used as a speed reduction device in a drive mechanism of a transfer robot or the like (for example, refer to Patent Document 1). [0003] The wave gear device includes a ring-shaped rigid internal gear (rigid gear) having internal teeth on the inner peripheral surface, a flexible external gear (flex gear) having external teeth on the outer peripheral surface, and a wave generator (wave generator). The number of external teeth of the flexible external gear is less than the number of internal teeth of the rigid internal gear. The wave generator bends the flexible external gear disposed inside the rigid internal gear into an elliptical shape, so that the external teeth of the flexible external gear mesh with the internal teeth of the rigid internal gear. In addition, the rotation of the wave generator moves the meshing position between the extern...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H49/00F16H55/17F16H55/08F16H57/021
CPCF16H49/001F16H55/17F16H55/0833F16H57/021F16H2055/176
Inventor 镰形州一三好洋之
Owner NABLESCO CORP