Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Reexamination Certificate
2005-12-06
2005-12-06
Lazo, Thomas E. (Department: 3745)
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
C251S030020, C251S043000
Reexamination Certificate
active
06971232
ABSTRACT:
A control valve assembly (43) for use in a system in which a pump-motor unit (35) can either receive drive torque from a drive-line (17) or transmit torque thereto. The system includes a high pressure accumulator (41) and the control valve assembly is disposed between the pump-motor unit and the accumulator, and includes a mode valve (45) normally biased closed by pressure in a control cavity (89), the fluid pressure in which is controlled by a pilot valve assembly (49) in response to an electrical signal (133). A step-orifice valve (47) associated with the mode valve poppet member (79) provides a relatively larger orifice (115) into the control cavity (89) when pressure therein is high, and a relatively smaller orifice (119) into the control cavity when pressure therein is low, i.e., when the pilot valve assembly (49) is open. Thus, a large volume of flow can occur from the accumulator to the unit (35) in a motoring mode, with a relatively low pressure drop, while the poppet member is able to have softer, relatively longer opening time, but a relatively faster closing time.
REFERENCES:
patent: 4553732 (1985-11-01), Brundage et al.
patent: 4813510 (1989-03-01), Lexen
patent: 5088041 (1992-02-01), Tanaka et al.
patent: 6719080 (2004-04-01), Gray, Jr.
Eaton Corporation
Kasper L. J.
Lazo Thomas E.
LandOfFree
Hydraulic drive system and improved control valve assembly... 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 drive system and improved control valve assembly..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic drive system and improved control valve assembly... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3473397