| 摘要 |
<p>A wave gear device (1), wherein a rigid internal gear (2) is formed in a conical gear and a flexible external gear (3) is formed in a spur gear with a module m. The number of the teeth of the external gear (3) is reduced by the quantity of 2n (n is a positive integer) less than that of the internal gear (2), and the amount of the deflection of the major axis of the elliptic rim neutral line of the external gear (3) in the cross section perpendicular to the axis of the external gear (3) in the tooth trance direction is set to 2 kappa mn (kappa > 1). In the cross section perpendicular to the axis at the intermediate part in the tooth trance direction, the engagement of the teeth of both gears (2, 3) is approximated by the engagement of a rack to obtain the moving route (M) of the teeth of the external gear (3) according to the rotation of a wave generator (4). The curved portion (AB) of the moving route (M) ranging from the deepest engaged position (A) of both gears where the inclination angle of the moving route (M) relative to the radius line of the internal gear (2) is 90º to a position (B) where the inclination angle is alpha is obtained in an area ranging from the major axis to a tooth departure side. Then, a first analogous curve obtained by multiplying the curved portion (AB) by lambda times is used as the tooth profile of the external gear (3), and a second analogous curve obtained by multiplying it by (lambda + 1) times is used as the tooth profile of the internal gear (2). The tooth crest of the internal gear (2) is formed so as to be positioned parallel with the bottom of the external gear (3) through a specified clearance on the axial section including the major axis after the deformation of the external gear (3).</p> |
