Hydraulic control circuit for a continuously variable...

Details Hydraulic control circuit for a continuously variable... Hydraulic control circuit for a continuously variable...

2006-06-06

2006-06-06

Lewis, Tisha (Department: 3681)

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

C477S050000, C476S010000

Reexamination Certificate

active

07056261

ABSTRACT:
A hydraulic circuit for a continuously variable transmission having a continuously variable ratio unit that is controlled by at least one hydraulic actuator acting on a movable torque transmission element. The actuator has opposed first and second working chambers. The circuit includes first and second flow lines that are connected to two respective actuator working chambers. The lines feed fluid thereto and therefrom A pressurized supply of fluid urges fluid flow through the flow lines. A variable control valve is incorporated in both flow lines. Each valve generates an adjustable back pressure therein. A further valve is connected between the two flow lines. The further valve has a variable opening and is located upstream of the variable control valve. Opening of the further valve enables flow fluid from one flow line to the other to reduce pressure difference between the lines.

REFERENCES:
patent: 4524641 (1985-06-01), Greenwood
patent: 5090951 (1992-02-01), Greenwood
patent: 5099710 (1992-03-01), Nakano
patent: 5938557 (1999-08-01), Greenwood
patent: 2 312 258 (1997-10-01), None
patent: WO 95/17621 (1995-06-01), None
patent: WO 99/58883 (1999-11-01), None

Affiliated with

Also associated with

Rating

Hydraulic control circuit for a continuously variable... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydraulic control circuit for a continuously variable..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control circuit for a continuously variable... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3631781