Differential gear

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

Patent

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Details

F16H 48/20 (2006.01) F16D 7/00 (2006.01)

Patent

CA 2202925

The present invention provides a differential gear capable of constantly ensuring a stable differential motion restricting force even in the case of a low rotational speed. In the present invention, when there occurs a difference in rotational speed between output side rotary elements, rollers are allowed to roll while being in contact with the confronting faces of the input side and output side rotary elements. The rollers move along rotational trajectories of the output side rotary elements while being restricted by a holder element from rolling toward the direction inclined by a predetermined angle relative to the rotational trajectories of the output side rotary elements. Thus, there occurs a frictional force between the rollers and the contact faces therewith, which results in a resistance to restrict the differential motion, At that time, the rollers generate a sliding friction in the course of rolling, thereby always ensuring a stable frictional force based on a dynamic friction even at a low rotational speed.

Engrenage différentiel muni d'un dispositif de résistance au mouvement qui permet d'assurer un mouvement différentiel constant et stable, et ce, même à une basse vitesse de rotation. Lorsqu'il y a une différence entre la vitesse de rotation du côté extérieur des éléments rotatifs, les rouleaux peuvent tourner, mais des surfaces de frottement touchent leurs côtés intérieur et extérieur. Un élément de retenue empêche les rouleaux, lesquels se déplacent selon la trajectoire de rotation du côté extérieur des éléments de rotation, de suivre la direction imposée par un angle prédéterminé par rapport aux trajectoires de rotation du côté extérieur des éléments de rotation. La force de frottement, qui est causée par le contact des rouleaux et des surfaces de frottement, occasionne une résistance qui a pour effet de restreindre le mouvement différentiel. Ainsi, les rouleaux génèrent une force de frottement de glissement qui permet d'assurer, même à basse vitesse de rotation, une force de frottement stable reposant sur un frottement dynamique.

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