Hydraulic pressure control device for automatic transmission for

Details Hydraulic pressure control device for automatic transmission for Hydraulic pressure control device for automatic transmission for

1989-01-27

1990-05-01

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

74869, 74878, B60K 4106

Patent

active

049208292

ABSTRACT:
A hydraulic pressure control device for an automatic transmission for a vehicle, including a first, a second and a third hydraulic pressure control valve, wherein the third hydraulic pressure control valve cooperates with the first hydraulic pressure control valve to control switching over of a certain operation of the automatic transmission such as engagement and disengagement of a torque converter lock-up clutch during forward traveling of the vehicle, and also cooperates with the second hydraulic pressure control valve to selectively prevent setting up of the reverse stage when a manual shift valve is set to the reverse range while the vehicle is traveling forward.

REFERENCES:
patent: 3937107 (1976-02-01), Lentz
patent: 4033203 (1977-07-01), Hirosawa et al.
patent: 4136584 (1979-01-01), Ishikawa
patent: 4290325 (1981-09-01), Nishimura
patent: 4307631 (1981-12-01), Iwanaga et al.
patent: 4488457 (1984-12-01), Nishimura et al.
patent: 4545265 (1985-10-01), Abo et al.
patent: 4744269 (1988-05-01), Greene et al.
patent: 4827807 (1989-05-01), Hayakawa et al.

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