Shift control system for automatic transmission

Details Shift control system for automatic transmission Shift control system for automatic transmission

1991-06-20

1992-09-08

Bonck, Rodney H.

Machine element or mechanism

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

Preselected indexed position

F16H 560

Patent

active

051448661

ABSTRACT:
A shift control system for an automatic transmission is disclosed, which comprises, in the first embodiment for example, an orifice bypass valve including a spool, a spring and a pilot port. The spool is movable between an interrupting position where a first hydraulic passage is interrupted from a third hydraulic passage, and a connecting position where a first passage is connected with a third passage, and it is pressed to the interrupting position by the spring. The pilot port induces a force by which the spool is pressed in the direction opposite to a force of the spring when the hydraulic fluid is supplied, and it is connected with a fourth hydraulic passage for receiving the hydraulic fluid for operating an overrunning clutch.

REFERENCES:
patent: 4331046 (1982-05-01), Leonard et al.
patent: 4700591 (1987-10-01), Yasue et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4843920 (1989-07-01), Hayasaki et al.
patent: 5022284 (1991-06-01), Shimei
patent: 5050460 (1991-09-01), Sugano

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