Land vehicles – Suspension modification enacted during travel – Riding or suspension height
Reexamination Certificate
2008-04-15
2008-04-15
Culbreth, Eric (Department: 3616)
Land vehicles
Suspension modification enacted during travel
Riding or suspension height
C280S124157, C280S005500, C280S006159
Reexamination Certificate
active
07357395
ABSTRACT:
A device for controlling suspension performance in a vehicle having variable loads on an axle, a level control system, and a hydropneumatic suspension apparatus between unsprung and sprung masses. The device includes at least one double-acting hydraulic cylinder having a cylinder chamber and a toroid chamber, a pump, a cylinder chamber inlet line connecting the pump to the cylinder chamber, a toroid chamber inlet line connecting the pump to the toroid chamber, and a cylinder chamber outlet line. Two 2/2 port directional control valves configured to regulate the level control system are disposed in the cylinder chamber inlet line and the cylinder chamber outlet line, respectively. A pilot valve is disposed in the toroid chamber inlet line and dependent on a pressure level in the cylinder chamber inlet line. A two-stage pressure control valve is disposed downstream of the pilot valve and configured to regulate a toroid pressure level in the toroid chamber as a function of a cylinder pressure level in the cylinder chamber so that the toroid pressure is increased when the cylinder pressure is low.
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Amores Karen Jane J.
Carl Freudenberg KG
Culbreth Eric
Davidson Davidson & Kappel LLC
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