Duplex type wave gear device
A wave gear device, gear technology, applied in the direction of gear transmission, transmission, hoisting device, etc., can solve the problems of difficult and low speed ratio, and achieve the effect of improving tooth contact, increasing the fatigue strength of the bottom of the tooth, and improving the service life
Active Publication Date: 2018-12-04
HARMONIC DRIVE SYST IND CO LTD
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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
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[0102] 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.
[0103] 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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The external tooth gear (4) of the duplex type wave gear device (1) includes: first and second external teeth (7, 8) having different numbers of teeth, and a tool retreat formed between these external teeth as a tool for cutting teeth. gap (9). The maximum width L1 of the gap (9) is 0.1 to 0.3 times the width L of the external gear. The depth from the tooth top tooth surface of the first external tooth (7) to the deepest part (9a) of the gap (9) is 0.9 to 1.3 times the tooth height of the first external tooth, and the tooth top of the second external tooth (8) The depth from the tooth surface to the deepest part (9a) is 0.9 to 1.3 times the tooth height of the second external teeth. The present invention can realize a wave gear device with improved tooth bottom fatigue strength of external gears having first and second external teeth with different numbers of teeth, large 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...
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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