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Dual-type wave gear device

A technology of wave gear device and gear, applied in the direction of gear transmission device, transmission device, hoisting device, etc., can solve the problems of low speed ratio and difficulty, and achieve the effect of improving the fatigue strength of the bottom of the tooth, improving the tooth contact and improving the service life.

Active Publication Date: 2017-05-10
HARMONIC DRIVE SYST IND CO LTD
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AI Technical Summary

Problems solved by technology

Considering the mechanical characteristics and mechanical performance of the wave gear reducer in which the external tooth gear is bent and deformed while meshing with the internal tooth gear, etc., the speed ratio of the wave gear reducer is usually more than 50, and it is difficult to obtain less than 30. For example, Low speed ratio around 20-15

Method used

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  • Dual-type wave gear device
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[0104] In addition, in the above-mentioned example, the first internal gear 2 is a stationary internal gear, and the second internal gear 3 is a driving internal gear. Conversely, it is also possible to make the first internal gear 2 a drive-side internal gear, and make the second internal gear 3 a stationary-side internal gear.

[0105] In addition, the externally toothed gear 4 can be bent and deformed by the wave generator 5 into a non-circular shape other than an ellipse, for example, a non-circular shape such as a three-lobe shape. When the number of meshing parts between the externally toothed gear and the internally toothed gear deformed into a non-circular shape is h (h: a positive integer greater than 2), the difference in the number of teeth of the two gears only needs to be set as h*p (p: positive integer) is fine.

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Abstract

An external gear (4) of a dual-type wave gear device (1) is provided with first and second external teeth (7, 8), the numbers of which differ, and gaps (9) formed therebetween that serve as the cutter clearance areas for a tooth-cutting cutter. The maximum width (L1) of the gaps (9) is 0.1-0.3 times the width (L) of the external gear. The depth from the tooth crests of the first external teeth (7) to the deepest area (9a) of the gaps (9) is 0.9-1.3 times the tooth depth of the first external teeth. The depth from the tooth crests of the second external teeth (8) to the deepest area (9a) is 0.9-1.3 times the tooth depth of the second external teeth. The tooth root fatigue strength of the external gear provided with differing numbers of first and second external teeth is increased, making it possible to achieve a wave gear device with high load capacity and small speed ratio.

Description

technical field [0001] The present invention relates to a wave gear device including a pair of internal gears, a cylindrical external gear capable of bending deformation in the radial direction, and a wave generator. Background technique [0002] A wave gear device equipped with a cylindrical external gear generally includes: a stationary side internal gear that is fixed and does not rotate, a wave generator as a rotation input element, a driving side internal gear as a deceleration rotation output element, and a A cylindrical external gear that meshes with the stationary internal gear and the drive internal gear and is capable of bending deformation in the radial direction. In a typical wave gear device, an externally toothed gear is bent and deformed into an elliptical shape, and meshes with stationary and driving side internally toothed gears at both ends of the major axis of the ellipse. [0003] Patent Document 1 describes a general wave gear device in which the statio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H1/32F16H55/08
CPCF16H1/32F16H55/08F16H55/0833F16H49/001F16H55/16
Inventor 半田纯清泽芳秀泷泽登张新月
Owner HARMONIC DRIVE SYST IND CO LTD
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