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Wave gear device

A technology of wave gear device and external gear, applied in the direction of gear transmission device, transmission device, belt/chain/gear, etc., can solve the problem that the fatigue strength of the tooth bottom of the flexible external gear is reduced, the rigidity is increased, and the load on the tooth surface cannot be obtained. distribution and other problems, to achieve the effect of increasing the fatigue strength of the tooth bottom, increasing the load capacity and improving the fatigue strength of the tooth bottom

Active Publication Date: 2010-08-25
HARMONIC DRIVE SYST IND CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Even if the tooth width is excessively widened, not only cannot a good tooth surface load distribution throughout the entire tooth width be obtained, but also the rigidity of the flexible external gear becomes high so that it is not easy to deform into an ellipse, which in turn causes the flexible external gear to deform. Reduced tooth bottom fatigue strength

Method used

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Embodiment Construction

[0059] Hereinafter, embodiments of a cup-shaped or top hat-shaped wave gear device according to the present invention will be described with reference to the drawings. In addition, the overall structure of a cup-shaped or top hat-shaped wave gear device is the same as the general structure shown in FIGS. 1 and 2 .

[0060] (Flexible external gear rim wall thickness)

[0061] 3 is a conceptual diagram showing the rim thickness of a cup-shaped or top-hat-shaped flexible external gear in a cup-shaped or top-hat-shaped wave gear device. In this figure, the rim wall thickness is the thickness of the portion indicated by t. In addition, the radial deflection amount d of the flexible external gear 3 bent into an elliptical shape by the elliptical wave generator 4 is the axis perpendicular section set at an arbitrary position in the tooth line direction of the external teeth 35. Radius deflection at the location of the major axis of an ellipse bordering a neutral circle. If the too...

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Abstract

The invention provides a cup-type or ''silk hat''-type wave gear device capable of largely increasing load capacity. In the cup-type or ''silk hat''-type wave gear device (1), the rim thickness t of the flexible externally toothed gear (3) thereof satisfies the relations: (0.5237Ln(R)-1.32)d<=t<=(0.8728Ln(R)-2.2)d, if the reduction ratio R of the wave gear device is less than 80, and (1.5499Ln(R)-5.8099)d<=t<=(2.5832Ln(R)-9.6832)d, if the reduction ratio R is equal to or greater than 80, where d is the radial deflection, measured at the position of the major axis of the neutral circle of the rim, in a state in which the flexible externally toothed gear is bent into an elliptical shape. The effective face width L of the external teeth (35) is a value within the range of 21% to 30% of the pitch circle diameter. Such settings make it possible to increase the bottom fatigue strength of the flexible externally toothed gear and improve the load capacity of the wave gear device (1).

Description

technical field [0001] The present invention relates to a cup-type wave gear device including a cup-shaped flexible external gear or a top-hat type wave gear device including a top-hat-shaped flexible external gear, and more specifically, to a device for improving the flexibility of a flexible external gear. Improvement technology to realize high strength of wave gear device based on tooth bottom fatigue strength. Background technique [0002] Since the invention of the wave gear device by the founder C.W. Musser (Patent Document 1: US Patent No. 2906143), many inventions and designs have been carried out by many researchers. For example, wave gear devices are disclosed in Patent Document 2 (Japanese Patent Publication No. Sho 45-41171) and Patent Document 3 (Japanese Patent Laid-Open No. 7-167228). [0003] As a typical wave gear device, there is known a wave gear device in a form including a cup-shaped or hat-shaped flexible external gear. FIG. 1 is a perspective view of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H1/32
CPCF16H2049/003F16H49/001F16H55/0833Y10T74/19967Y10T74/19F16H1/28F16H1/32
Inventor 张新月
Owner HARMONIC DRIVE SYST IND CO LTD
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