Lock-out suspension for an agricultural tractor

Details Lock-out suspension for an agricultural tractor Lock-out suspension for an agricultural tractor

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/04 (2006.01) B60G 17/00 (2006.01)

Patent

CA 2348362

A hydraulic circuit controls a doubling acting cylinder of a vehicle suspension to provide load leveling and shock absorption functions. A set of solenoid valves control the application of pressurized hydraulic fluid from a supply line to the cylinder and from the cylinder to a tank return line to raise and lower the vehicle for load leveling. The chambers of the cylinder are interconnected by a parallel arrangement of a check valve, orifice and a relief valve. Another parallel arrangement of a check valve, orifice and a relief valve couples the cylinder to an accumulator. These parallel arranged components enable the doubling acting cylinder to function as a passive shock absorber. A lock-out valve is provided in the preferred embodiment a to defeat the shock absorber operation and provide a very stiff suspension.

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