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Wave gear device having tapered flexible external gear

A wave gear device, flexible technology, applied in the direction of gear transmission, transmission, components with teeth, etc., can solve the problem of insufficient consideration, and achieve the effect of increasing the transmission load torque

Active Publication Date: 2014-05-28
HARMONIC DRIVE SYST IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design method of a reasonable tooth profile for the deflection action (coning) of the flexible external gear caused by such a wave generator has not been fully considered so far.

Method used

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  • Wave gear device having tapered flexible external gear
  • Wave gear device having tapered flexible external gear
  • Wave gear device having tapered flexible external gear

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Effect test

Embodiment Construction

[0042] Next, a wave gear device to which the present invention is applied will be described with reference to the drawings.

[0043] (Structure of wave gear unit)

[0044] figure 1 It is a front view of the wave gear device which is the object of the present invention. figure 2 This is a cross-sectional view showing the state of bending the opening of the flexible external gear into an elliptical shape, including the shaft section, figure 2 (a) shows the state before deformation, figure 2 (b) shows the deformed section containing the major axis of the elliptic curve, figure 2 (c) shows a deformed section containing the minor axis of the elliptic curve. in addition, figure 2 In (a) to (c), the solid line shows a cup-shaped flexible external gear, and the dotted line shows a top-hat-shaped flexible external gear.

[0045] As shown in these figures, the wave gear device 1 has an annular rigid internal gear 2, a flexible external gear 3 arranged inside it, and a wave ge...

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Abstract

With a wave gear device (1), the gears (2, 3) employ homothetic curve tooth profiles AD, BE, which are derived from the movement locus M1 at the aperture end (34a) of the external teeth (34) of the non-deflecting (kappa = 1) flexible external gear (3) with respect to inner teeth (24). Furthermore, a transposition is applied to the external teeth (34) along the tooth trace such that the movement loci M2, M3 of the external teeth (34) in a section perpendicular to the axis, from the aperture end (34a) to the inner end (34b), share the movement locus M1 of the aperture end (34a) and bottom portion thereof, and a continuous meshing of the teeth in the tooth trace direction is achieved. Furthermore, the tooth bottom rim thickness of the aperture end (34a) of the external teeth (34) is optimized using a modified Goodman diagram, and a tooth bottom rim thickness which takes into account the relationship between the tooth profile and the transmitted torque from the aperture end (34a) to the inner end (34b) is employed for the flexible external gear (3). Thus, the transmission load torque of the flexible external gear (3) can be increased.

Description

technical field [0001] The present invention relates to a wave gear device having a conical flexible external gear having a tooth profile capable of continuous meshing over a wide range in the tooth line direction. In more detail, it also relates to a wave gear device having a conical flexible external gear capable of increasing the transmitted load torque by optimizing the ring thickness setting of the flexible external gear. Background technique [0002] Since the invention of the wave gear device by the founder C.W. Musser (Patent Document 1), many researchers including the founder and the present inventor have proposed various inventive designs of the device. There are many kinds of inventions related to its tooth profile. For example, in Patent Document 2, the inventor proposes to use an involute tooth profile as the basic tooth profile, and in Patent Documents 3 and 4, it is proposed to use a rack to align the teeth of the rigid internal gear and the flexible external...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H1/32
CPCF16H49/001F16H2049/003F16H1/32F16H55/0833Y10T74/19647
Inventor 石川昌一
Owner HARMONIC DRIVE SYST IND CO LTD
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