N-R control valve of a hydraulic control system for automatic tr

Details N-R control valve of a hydraulic control system for automatic tr N-R control valve of a hydraulic control system for automatic tr

1997-08-27

2000-02-15

Michalsky, Gerald A.

192 clutches and power-stop control

Clutches

Operators

13762564, 13762566, 13762568, F15B 13042

Patent

active

060242000

ABSTRACT:
A control valve includes a valve body having a first, second and third port, and a valve spool disposed in the valve body. The valve spool has a first and second end, and includes a first, second and third land. The first land is disposed at the first end for receiving hydraulic pressure supplied via the first port to bias the valve spool in a first direction. The second land allows fluid communication between the second and third ports when the valve spool is biased in the first direction, and the third land is disposed between the first and second land. The third land includes a passage which allows fluid communication between each side of the third land. A spring biased the valve spool in a second direction, opposite the first direction.

REFERENCES:
patent: 3486801 (1969-12-01), Frayer
patent: 4052930 (1977-10-01), Hiramatsu et al.
patent: 5031663 (1991-07-01), Fukuta et al.

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