Patent ID: 6840118
Filing Date: 2005-01-11
Classification: G01L

Abstract:
1. A torque detection method for detecting transmission torque in a wave gear device in which a flexible, circular external gear is radially flexed into partial engagement with a rigid, internal gear and positions of engagement between the two gears are moved in a circumferential direction to generate a relative rotation arising from a difference in the number of teeth of the two gears, said method comprising: a step of adjusting gain of output signals of a plurality of strain gauges affixed to a surface of the flexible external gear, and a step of combining output signals of strain gauges after adjustment of output signal gain, wherein the step of adjusting the gain comprises adjusting output signal gain of each strain gauge to enable removal or control of rotational ripple included in output signals of strain gauges produced by distortion of the flexible external gear that is unrelated to transmission torque.