Planetary gear of automatic transmission

Details Planetary gear of automatic transmission Planetary gear of automatic transmission

1990-04-17

1991-10-01

Herrmann, Allan D.

Planetary gear transmission systems or components

Planetary gearing or element

Particular gear tooth feature

74410, 475255, F16H 128

Patent

active

050529919

ABSTRACT:
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.

REFERENCES:
patent: 1388897 (1921-08-01), Schmidt
patent: 3655021 (1972-04-01), Froio
patent: 4222289 (1980-09-01), Watanabe

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