Method of finishing gears, and gear

B - Operations – Transporting – 23 – F

Patent

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B23F 17/00 (2006.01) B23F 19/00 (2006.01) F16H 55/08 (2006.01)

Patent

CA 2344421

A method of machining at least one tooth flank of a gear with a finishing tool. The method comprises rotating the finishing tool, such as a grinding tool, and bringing the tool and the tooth flank into contact. Relative movement between the tool and the gear is provided to traverse the tool across the tooth flank along a path whereby the path produces a tooth flank geometry of a form which, when brought into mesh with a mating tooth flank to form a tooth pair under no load or light load, provides a motion graph curve (A) that intersects, at least two times, a motion graph curve of at least one of an immediately preceding tooth pair (P) and an immediately following tooth pair (F). The motion graph curve of the tooth pair describes contact between respective tooth flanks of said tooth pair from an initial entrance into mesh to a final exit from mesh as being over a gear rotation amount of greater than 1.0 pitch and preferably, about 1.5 pitch to about 3.0 pitch.

L'invention concerne un procédé permettant d'usiner au moins un flanc de dent à l'aide d'un outil à finition. Ce procédé consiste à faire tourner un outil à finition, tel qu'un outil de rectification, et à amener ledit outil et le flanc de la dent en contact. Un déplacement relatif entre l'outil et l'engrenage permet audit outil de traverser le flanc de dent en suivant un chemin, ledit chemin produisant une géométrie de flanc de dent présentant une forme qui, lorsque ladite géométrie vient s'engrener dans un flanc de dent correspondant, forme une paire de dents sous une charge nulle ou faible, ledit déplacement relatif produisant une courbe graphique (A) de déplacement qui coupe, au moins deux fois, la courbe graphique d'au moins la paire de dents qui précède (P) et la paire de dents qui suit (F). La courbe graphique de déplacement de ladite paire de dents décrit le contact entre les flancs de dent respectifs d'une paire de dents, du début à la fin de l'engrenage, ledit engrenage présentant un mouvement de rotation supérieur à 1,0 pas et de préférence, un pas se situant entre environ 1,5 et 3,0.

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