Sliding wedge gear that achieves high meshing efficiency

摘要

Sliding wedge gear (10) comprising: a circular spline (20) having an inner annular portion with teeth (22), a flexspline (30) rotatably disposed in the circular spline (20) and an outer annular portion with teeth (32) which engages the inner annular portion with teeth (22) of the circular spline (20), and a wave generator (40) rotatably disposed in the flexspline (30) and comprising an elliptical outer periphery (42), which abuts against an inner circumference of the flexspline (30), the radius of curvature of the elliptical outer circumference (42) being defined as where the ratio between x and y is the elliptic parameter equation x = {a + Ca x (sin (4θ - (π / 2)) + 1)} · sinθ, y = {b + Cb * (sin (4θ - (π / 2)) + 1)} · cosθ, satisfying 0 ≤ θ ≤ 2π, where a is the major half-axis of the elliptical outer periphery (42) of the Wave Generator (40), Ca is the correction factor for the big Ha lbachse, b is the small semiaxis of the elliptical outer circumference (42) of the wave generator (40), Cb is the correction factor for the small semiaxis, and θ is the eccentric angle of the elliptical outer circumference (42) of the wave generator (40).