Powershift transmission with direct drive and modulated torque c

Details Powershift transmission with direct drive and modulated torque c Powershift transmission with direct drive and modulated torque c

1979-09-14

1981-10-27

Krizmanich, George H.

Machine element or mechanism

Elements

Gear casings

74404, 74677, 74786, F16H 4708, F16H 5700

Patent

active

042966450

ABSTRACT:
A three speed powershift gear transmission includes a torque converter mounted on the input shaft and driven by a fluid actuated modulating clutch to provide fine speed control in two output speed ranges, direct drive in a higher speed range and a reversing drive provided by a duplex planetary gear set. A single countershaft mounts the driven gears of the three speed ranges. The first or lowest speed driven gear is mounted on an overrunning clutch and the second driven gear is connectable to the countershaft by a fluid actuated clutch. The direct drive or third gear is fixed to the countershaft and is drivingly engaged to the input shaft through a fluid actuated clutch. The duplex planetary gear includes a friction clutch responsive to axial gear reaction forces to lock the ring gear to the planet gear carrier in forward drive and a fluid actuated brake for arresting rotation of the ring gear to provide reverse rotation of the planet gear carrier and the transmission output shaft.

REFERENCES:
patent: 2870655 (1959-01-01), Rockwell
patent: 2926551 (1960-03-01), Howard
patent: 3256751 (1966-06-01), Tuck et al.
patent: 3359833 (1967-12-01), Flinn
patent: 3396610 (1968-08-01), Rich et al.
patent: 3426622 (1969-02-01), Tuck
patent: 3728913 (1973-04-01), Nagasaki
patent: 3916729 (1975-11-01), Herr

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