Failsafe hydraulic circuit

Details Failsafe hydraulic circuit Failsafe hydraulic circuit

2006-10-31

2006-10-31

Wright, Dirk (Department: 3681)

Planetary gear transmission systems or components

Input from independent power sources

Including electric motor input

C475S119000

Reexamination Certificate

active

07128676

ABSTRACT:
A failsafe hydraulic circuit designed to avoid simultaneous engagement of two friction engagement elements (e.g., clutches, brakes, etc.) incorporated in a speed change apparatus of a motor vehicle or the like. If a first failsafe valve is in the open position state and a first engaging pressure is supplied to a first hydraulic servo via the first failsafe valve, the first engaging pressure is also input to a first oil pressure switch via a second failsafe valve being in the closed position state. Therefore, using the first oil pressure switch, it can be detected that the first engaging pressure is supplied to the first hydraulic servo. Furthermore, if the first engaging pressure is, for example, greater than the set pressure of the first oil pressure switch, this situation can also be detected. Such detections provide confirmation of normal operation of the first failsafe valve and the second failsafe valve.

REFERENCES:
patent: 3623568 (1971-11-01), Mori
patent: 6055876 (2000-05-01), Kato
patent: 6375591 (2002-04-01), Wakahara et al.
patent: 6554736 (2003-04-01), Takano et al.
patent: 2003/0064849 (2003-04-01), Saitou et al.
patent: 2003/0064854 (2003-04-01), Kotani
patent: 2003/0078134 (2003-04-01), Kojima et al.
patent: 2004/0084233 (2004-05-01), Wakuta et al.
patent: 47-31773 (1972-08-01), None
patent: 2002-225578 (2002-08-01), None
patent: 2003-49937 (2003-02-01), None
patent: 2003-16433 (2003-04-01), None
patent: 2003-106433 (2003-04-01), None

Affiliated with

Also associated with

Rating

Failsafe hydraulic circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Failsafe hydraulic circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Failsafe hydraulic circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3695651