Mechanical automatic transmission directly responsive to torque

Details Mechanical automatic transmission directly responsive to torque Mechanical automatic transmission directly responsive to torque

1991-10-18

1993-11-23

Braun, Leslie A.

Planetary gear transmission systems or components

Condition responsive control

Speed responsive control adjusted or opposed by torque

74336R, 74337, 475258, 475261, 475262, 475264, 475266, 475269, 475293, 475298, 475300, 475320, 475330, F16H 5914, F16H 5938, F16H 146, B60K 1708

Patent

active

052639061

ABSTRACT:
A multi-speed mechanical automatic transmission has two planetary gear trains, each including a sun gear, planet gears mounted in a planet carrier, and a ring gear. The first planetary gear train provides low gear and direct drive; the second train modifies low gear operation of the first train to provide an intermediate gear operation. The first sun gear is fixed to an input shaft, and the first planet carrier drives an output shaft. The second planet carrier is coupled to rotate the first ring gear in one direction, and free wheels or selectively actuated friction brakes prevent rotation of the first and second ring gears in the opposite direction. The first planetary train has helical gears, and a direct drive clutch selectively couples the first ring gear to the first planet carrier. This clutch is urged toward disengagement, so as to shift the transmission into low gear, by axial movement between the first ring gear and first planet gears in response to a driving torque applied between the gears; it is urged by centrifugal weights toward engagement so as to shift the transmission into direct drive. A second clutch selectively couples the second sun gear to the input shaft or, in the alternative, the second ring gear to the transmission housing. When the second clutch is disengaged, the second planetary train is idle and does not influence low gear operation of the first planetary train. When the second clutch is engaged, the second planetary train drives the first ring gear forward at a reduced speed to provide an overall ratio intermediate between low gear and direct drive.

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