公开(公告)号：US5052991A

公开(公告)日：1991-10-01

申请号：US510190

申请日：1990-04-17

申请人： Kozo Yamaguchi ,  Toyoji Negi ,  Tadashi Kondo ,  Kunihiro Iwatuki

发明人： Kozo Yamaguchi ,  Toyoji Negi ,  Tadashi Kondo ,  Kunihiro Iwatuki

IPC分类号： F16H1/28 ,  F16H3/44 ,  F16H57/08

CPC分类号： F16H57/0025 ,  F16H57/082 ,  Y10T74/19628

摘要： In an overdrive planetary gear unit of an automatic transmission, a helical planetary pinion has its front portion cut to form an cutout portion and to have an axial-direction cross section asymmetrical in the direction of its rotation axis in order to uniformize, in the axial direction, the load imposed upon a bearing disposed around the circumference of the pinion shaft.In a front planetary gear unit of a main transmission of the automatic transmission, a helical planetary pinion has its rear portion cut to form an cutout portion and to have an axial-direction cross section asymmetrical in the direction of its rotation axis in order to uniformize the load imposed upon a bearing disposed around the circumference of the pinion shaft.It is thereby possible to reduce the weight of each planetary pinion and, hence, the centrifugal force acting on the pinion. In the overdrive planetary gear unit, the center of gravity of the planetary pinion is shifted toward the rear end of the pinion, and the centrifugal force acting on this pinion is therefore smaller at the front end, thereby reducing the load imposed on the bearing at the front end. In the front planetary pinion gear unit of the main transmission unit, the center of gravity of the planetary pinion is shifted toward the front end, and the centrifugal force is therefore smaller at the rear end, thereby reducing the load imposed on the bearing at the rear end. The non-uniformity of the load on each bearing in the axial direction is thereby reduced.

摘要翻译： 在自动变速器的超速行星齿轮单元中，螺旋行星小齿轮的前部被切割以形成切口部分，并且在其旋转轴线的方向上具有不对称的轴向横截面，以便在轴向上均匀化 方向，施加在设置在小齿轮轴的圆周周围的轴承上的负载。 在自动变速器的主变速器的前行星齿轮单元中，螺旋行星齿轮的后部被切割以形成切口部分，并且在其旋转轴线的方向上具有不对称的轴向横截面，以使其均匀化 施加在设置在小齿轮轴的圆周周围的轴承上的负载。 从而可以减小每个行星齿轮的重量，并因此减小作用在小齿轮上的离心力。 在过驱动行星齿轮单元中，行星齿轮的重心朝向小齿轮的后端移动，因此作用在该小齿轮上的离心力在前端较小，从而减小了对轴承的负载 前端 在主传动单元的前行星小齿轮单元中，行星齿轮的重心朝向前端移动，因此离心力在后端较小，从而减小了在 后端。 因此，轴承上的每个轴承上的负载的不均匀性降低。