Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2005-08-09
2005-08-09
Michalsky, Gerald A. (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C137S625640
Reexamination Certificate
active
06926033
ABSTRACT:
This invention generally concerns electronically controlled hydraulic valves for use in electro-hydraulically controlled transmissions. The proportional pressure control valve20includes a hollow cage42pierced by cage tank ports52, cage clutch ports54, and cage pump ports56. The cage pump ports56receive fluid from a pump. The cage clutch ports54supply fluid to a hydraulic actuator. The cage tank ports52return fluid from the valve20to a tank from where fluid circulates back to the pump. Main spool112controls fluid flow between cage clutch ports54and cage pump ports56or cage tank ports52. An electro-magnetically operated pilot valve regulates fluid pressure applied to a control pressure surface138. A feedback pressure passage126, having feedback restriction orifice128, restrains the rate fluid flows between the cage clutch ports54and the feedback pressure surface114.
REFERENCES:
patent: 3029830 (1962-04-01), Klover
patent: 3286734 (1966-11-01), Hartshorne
patent: 3443594 (1969-05-01), Frayer
patent: 3537467 (1970-11-01), Marshall
patent: 3856047 (1974-12-01), Takayama
patent: 4313468 (1982-02-01), Patel
patent: 4527592 (1985-07-01), Dotti et al.
patent: 4567914 (1986-02-01), Coppola et al.
patent: 4674613 (1987-06-01), Sikorski
patent: 4741364 (1988-05-01), Stoss et al.
patent: 4785849 (1988-11-01), Masuda
patent: 4875501 (1989-10-01), Ichihashi et al.
patent: 4911469 (1990-03-01), Kawarasaki
patent: 4922964 (1990-05-01), Buscher
patent: 4966195 (1990-10-01), McCabe
patent: 5024459 (1991-06-01), Kokubo et al.
patent: 5031663 (1991-07-01), Fukuta et al.
patent: 5042832 (1991-08-01), Takahashi et al.
patent: 5051631 (1991-09-01), Anderson
patent: 5054599 (1991-10-01), Marcott
patent: 5062454 (1991-11-01), Ichihashi et al.
patent: 5174338 (1992-12-01), Yokota et al.
patent: 5836335 (1998-11-01), Harms et al.
patent: 6286535 (2001-09-01), Harms et al.
patent: 2102158 (1983-01-01), None
patent: 1-199081 (1989-08-01), None
Harms Louis C.
Liberfarb Zilek
Michalsky Gerald A.
Oberhardt William P.
Parker-Hannifin Corp.
LandOfFree
Proportional pressure control valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Proportional pressure control valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Proportional pressure control valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3479720