Hydraulic control system for automatic transmission having torqu

Details Hydraulic control system for automatic transmission having torqu Hydraulic control system for automatic transmission having torqu

1983-10-03

1986-04-29

Bonck, Rodney H.

192 clutches and power-stop control

Vortex-flow drive and clutch

Including drive-lockup clutch

192 329, F16D 3300

Patent

active

045851000

ABSTRACT:
A lock-up valve includes a spool movable between a clutch engagement position wherein the lock-up clutch is engaged and a clutch release position wherein the engagement of the lock-up clutch is released. A spring biases the spool toward the clutch release position. The spool has a first pressure acting area and a second pressure acting area. A fluid pressure is applied to the first pressure acting area during operation in the m+th speed ratio (where: m is an integer) and the m+1th speed ratio to urge the spool against the spring toward the clutch engagement position. A lock-up timing valve is provided which allows the application of another fluid pressure to the second pressure acting area during shifting between the m th speed ratio and the m+1th speed ratio to urge said spool toward the clutch release position.

REFERENCES:
patent: 4095486 (1978-06-01), Ohnuma
patent: 4270636 (1981-06-01), Sunohara et al.
patent: 4294140 (1981-10-01), Iwanaga et al.
patent: 4305487 (1981-12-01), Sunohara
patent: 4428259 (1984-01-01), Kubo et al.

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