Autoleveling device for a vehicle with a hydro-pneumatic suspens

Details Autoleveling device for a vehicle with a hydro-pneumatic suspens Autoleveling device for a vehicle with a hydro-pneumatic suspens

1979-11-15

1983-03-22

Peters, Jr., Joseph F.

Land vehicles

Wheeled

Running gear

267 6428, 280714, B60G 1126

Patent

active

043772994

ABSTRACT:
An autoleveling device for a vehicle having hydro-pneumatic suspension units including a housing fixed to a vehicle body the housing having an oil supply port, an oil exhaust port and a cylinder port commonly connected to the hydro-pneumatic suspension units, a cam rotatable in response to variations in vehicle height, a first piston movably following the profile of the cam, a second piston in opposition to the first piston, a first spring interposed between the first and second pistons, a second spring interposed between the second piston and an end of the housing to balancingly support the second piston with the first spring, an oil supply valve adapted to be opened by a displacement of the second piston in excess of a determined value in one direction to communicate the cylinder port with the oil supply port, an oil exhaust valve opened by a displacement of the second piston in excess of a determined value in the other direction to communicate the cylinder port with the oil exhaust port, a first oil chamber enclosing the first spring and second oil chamber enclosing the second spring on both sides of the second piston being communicated with each other through an orifice, thereby performing the autoleveling function with high accuracies by selecting the cam profile for moving the first piston, but preventing the autoleveling function when wheels of the vehicle momentarily hop due to uneveness of roads owing to a time delay constant resulting from the flow resistance of oil flowing through the orifice.

REFERENCES:
patent: 3659870 (1972-05-01), Okuyama
patent: 3831968 (1974-08-01), Shaffer

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