Shift valve with an intermediate position during a 4-2 shift

Details Shift valve with an intermediate position during a 4-2 shift Shift valve with an intermediate position during a 4-2 shift

1985-11-07

1987-05-05

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74752A, B60K 4106

Patent

active

046622497

ABSTRACT:
A hydraulic control system for an automatic transmission of a motor vehicle, which is provided with a bleed valve in a fluid chamber of a particular shift valve for restricting pressure increase when line pressure is admitted thereinto for a jumping shift to a lower gear position by bleeding part of the admitted line pressure to limit the displacement of a spool of the shift valve and to hold same in an intermediate position until solenoid pressure turns from high to low level, causing the shift valve to retain temporarily an intermediate gear position to lessen the deceleration shock which would otherwise be imposed on the vehicle body.

REFERENCES:
patent: 3014383 (1961-12-01), Flinn
patent: 3776048 (1973-12-01), Enomoto et al.
patent: 3800629 (1974-04-01), Lentz
patent: 3823621 (1974-07-01), Kabo et al.
patent: 3938409 (1976-02-01), Uozumi
patent: 3952614 (1976-04-01), Iijma
patent: 4023444 (1977-05-01), Murakami
patent: 4050332 (1977-09-01), Taga
patent: 4258591 (1981-03-01), Eckert et al.
patent: 4308764 (1982-01-01), Kawamoto et al.
patent: 4406181 (1983-09-01), Kubo et al.

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