Flexible meshing type gear device with a passing tooth profile

F - Mech Eng,Light,Heat,Weapons – 16 – H

Patent

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F16H 55/08 (2006.01) F16H 1/32 (2006.01)

Patent

CA 2165571

A meshing type gear device having improved strength and wear resistance and more particularly improved tooth surface wear resistance. Inca meshing type gear device (1), spur gears are used for both a rigid internal gear (2) and a flexible external gear (3), and the number of teeth of the flexible 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 made convex and the shape thereof is that of a curve AC obtained by subjecting a gear tooth portion (curve portion between A and B), which, at the moving path L that the external gear describes relative to the internal gear, as determined by rack approximation, is convex relative to the internal gear, to similarity transformation at a reduction ratio using the limiting point A of the contact between the two gears on the path as the origin, while the tooth profile of the rigid internal gear is made concave and the shape thereof is that of a curve AD obtained by subjecting the same portion convex relative to the internal gear at the moving path to similarity transformation at an enlargement ratio (1 + .lambda.) using the limiting point A as the origin, whereby the meshing of the two gears maintains continuous contact and is of the passing type. With this configuration, it is possible to greatly enhance the retention of a lubricating oil film between the tooth surfaces and to markedly improve the permissible delivered torque of the flexible meshing type gear device based on tooth surface wear.

Dispositif à engrenage du type à engrènement à solidité et à résistance à l'usure améliorées, et plus particulièrement à résistance à l'usure améliorée de la surface des dents. Dans un dispositif (1) à engrenage du type à engrènement, un engrenage droit est utilisé à la fois pour un engrenage interne rigide (2) et pour un engrenage externe souple (3) et le nombre de dents de l'engrenage externe souple (3) est supérieur de deux à celui de l'engrenage interne rigide (2). Le profil des dents de l'engrenage externe souple (3) est convexe, sous forme d'une courbe AC obtenue par transformation similaire à un taux de réduction lambda d'une partie convexe (une courbe entre A et B) par rapport à l'engrenage interne d'une trajectoire de déplacement L par approximation de crémaillère définie par le rapport engrenage externe/engrenage interne, un point limite A de contact entre les deux engrenages sur la trajectoire servant d'origine. Le profil des dents de l'engrenage interne rigide (2) est concave sous forme d'une courbe AD obtenue par transformation similaire à un taux d'agrandissement (1 + lambda ) de la même partie convexe par rapport à l'engrenage interne de la trajectoire de déplacement, le point de limite A de contact servant d'origine. Cette configuration permet de produire un engrènement continu et à contact permanent entre les deux profils de dents. Elle permet en outre d'augmenter considérablement la capacité de retenue d'un film d'huile de lubrification entre les surfaces de dents et d'augmenter considérablement le couple fourni possible du dispositif à engrenage du type à engrènement souple sur la base de l'usure de la surface des dents.

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