First-second gear shift valve of hydraulic transmission control

Details First-second gear shift valve of hydraulic transmission control First-second gear shift valve of hydraulic transmission control

1979-01-23

1981-02-03

Braun, Leslie

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74869, 74752C, B60K 4106

Patent

active

042481066

ABSTRACT:
In a hydraulic control system of an automatic power transmission is provided a first-second gear shift valve which is to be acted upon through only one fluid inlet port by a signal fluid pressure representative of a manual first forward drive range selected at the manually operated gear shift lever, the port being used not only as the port to receive the signal fluid pressure but as a switching port so that the shift valve is conditioned to produce the first gear in the transmission mechanism in the presence of the signal fluid pressure.

REFERENCES:
patent: 2788678 (1957-04-01), Sheppard
patent: 3136175 (1964-06-01), Ivey
patent: 3401581 (1968-09-01), Chana
patent: 3610070 (1971-10-01), Dach
patent: 3613484 (1971-10-01), Pierce et al.
patent: 3710638 (1973-01-01), Sakai
patent: 3747439 (1973-07-01), Uozumi et al.
patent: 3831465 (1974-08-01), Murakami
patent: 3886820 (1975-06-01), Lentz
patent: 3896685 (1975-07-01), Shellman
patent: 3938410 (1976-02-01), Dach et al.
patent: 4020718 (1977-05-01), Miyauchi
patent: 4111072 (1978-09-01), Harmon
patent: 4145937 (1979-05-01), Shindo et al.

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