| 摘要 |
In a flexible meshing type gear device (1), the amount of radial flexing (w) in a basic section defined perpendicular to the axis of the flexible external gear (3) at a prescribed point on the tooth trace of the flexible external gear (3) is def fined to be an amount of negative deviation flexing smaller than the normal amount of flexing (W0) The rigid internal gear (2) and the flexible external gear (3) are both spur gears and the number of teeth of the flexible external gear (3) is 2n (n being a positive integer) fewer than that of the rigid internal gear (2). The working tooth profile of one of the gears (2, 3) is defined to be a convex curve whose shape is or approximates a convex curve (L2(O,B)) obtained by similarity transformation of a peak portion (L1(O,A) of the rack- approximated moving path (L1) of a tooth of the gear with respect to the other gear in the basic section of the tooth trace perpendicular to the axis, the portion being convex relative to the other gear, at an enlargement ratio (.lambda.) using the apex of the moving path as the origin. The working tooth profile of the other gear is defined to be a concave curve whose shape is a concave curve (L3(O,C)) obtained by similarity transformation of the same portion of the moving path at an enlargement ratio (.lambda. + 1) using the apex of the moving path as the origin. The meshing of the two tooth profiles is pass messing enabling continuous -28- contact in the basic sector perpendicular to the axis and the ability to retain a lubricating oil film between the tooth surfaces is enhanced. |
