| 摘要 |
<p>A meshing type gear device designed to improve further its strength and wear resistance, and more particularly to improve the wear resistance of the tooth surface. In a meshing type gear device (1), a spur gear is used both for a rigid internal gear (2) and a flexible external gear (3), and the number of teeth of the flexible external gear (3) is made greater by two than that of the rigid internal gear (2). The tooth profile of the flexible external gear (3) is formed into a convex tooth profile which is in the form of a curve AC that is to be obtained through similar transformation at a reduction ration lambda of a convex portion (a curve between A and B) relative to the internal gear of a moving path L by rack approximation drawn by the external gear relative to the internal gear with a limiting point A of the contact between the two gears on the path serving as an origin, while the tooth profile of the rigid internal gear (2) is formed into a concave tooth profile which is in the form of a curve AD that is to be obtained through similar transformation at an enlargement ratio (1 + lambda ) of the same convex portion relative to the internal gear of the moving path with the limiting point A of the contact serving as an origin, whereby a continuously contactable and passing meshing can be produced between the two tooth profiles. With this configuration, it is possible to remarkably increase the capability of maintaining a lubricating oil film between the tooth surfaces and remarkably improve the permissible delivered torque of the flexible meshing type gear device based on the tooth surface wear. <IMAGE></p> |
