Automatic transmission

Details Automatic transmission Automatic transmission

1991-01-30

1993-09-21

Bonck, Rodney H.

Planetary gear transmission systems or components

With means to vary drive ratio or disconnect drive

Plural elements selectively braked

74867, F16H 5900

Patent

active

052464091

ABSTRACT:
A reverse bypass check valve is removed from the hydraulic control system of Allison MT 653 truck transmission while simultaneously raising the rate of increase of the main hydraulic pressure which occurs upon increasing the radial speed of the oil pump. Premature failure of the transmission will be avoided without reducing transmission performance.

REFERENCES:
patent: 4263822 (1981-04-01), Harmon
patent: 4416358 (1983-11-01), Kapp
patent: 4493228 (1985-01-01), Vukovich
patent: 4513640 (1985-04-01), Stevenson
patent: 4653350 (1987-03-01), Downs et al.
patent: 4653351 (1987-03-01), Downs et al.
patent: 4672862 (1987-06-01), Chana
patent: 4680959 (1987-07-01), Henry et al.
patent: 4719812 (1988-01-01), Machida et al.
Detroit Diesel Allison, Service Information Letter, 10-TR-80, Feb. 20, 1988.
Allison Transmission, Service Information Letter, 5-TR-90, Feb., 1990.

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