Title:
波動発生器、波動歯車装置および波動歯車装置の効率低下防止方法
Document Type and Number:
Japanese Patent JP4897610
Kind Code:
B2
Abstract:
A wave generator (4) of a wave gear device (1) is formed from a material in which only the minor axis-side portions (51, 52), which include the two end portions (51a, 52a) of an elliptical minor axis Lmin, has a larger coefficient of linear expansion than the other portions. When the temperature of a rigid cam plate (5) increases during high-speed rotational input, the minor axis-side portions (51, 52) thermally expand considerably more than the other portions do, and balls (10) other than several balls (10b) on a minor axis Lmin of a wave bearing (7) enter a tight state and form a locked state in which the wave bearing (7) rotates integrally with the rigid cam plate (5). Since the generation of agitation resistance of the lubricating agent due to the high-speed rolling movement of the balls (10) during high-speed rotational input can be avoided or reduced, a reduction of the torque transmission efficiency caused by the agitation resistance can be prevented or inhibited.
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Inventors:
Yu Kobayashi
Application Number:
JP2007206781A
Publication Date:
March 14, 2012
Filing Date:
August 08, 2007
Export Citation:
Assignee:
Harmonic Drive Systems Inc.
International Classes:
F16H1/32
Domestic Patent References:
| JP2002333055A | ||||
| JP2002349645A |
Attorney, Agent or Firm:
Shiro Yokozawa