Patent ID: 9470301
Filing Date: 2016-10-18
CPC Classification: F16H,Y10T

Claim Text:
1. A harmonic drive gear reduction mechanism, comprising: a rigid inner spline being hollow circular structure provided with 2(n+1) teeth and having a tooth module of m; a flexible outer spline being a hollow circular structure inserted in the rigid inner spline and provided with 2n teeth and the same tooth module of m as the rigid inner spline; a flexible bearing being a hollow structure inserted in the flexible outer spline; and a wave generator inserted in the flexible bearing; wherein a thickness between an inner diameter of the flexible bearing and a pitch diameter of the flexible outer spline is defined as t, a cross sectional profile of the wave generator consists of a first curve, a second curve, a third curve and a fourth curve, the first and third curves have a same radius of curvature R, it satisfies the equation: R=m (n+1)−t, a central angle of the first and third curves is k degrees, and 10<k<60, the second and fourth curves can be first-order differentiated, and conjunction points between the second and fourth curves and the first and third curves can also be first-order differentiated; the teeth of the flexible outer spline are involute teeth.