Dual acting hydraulic actuator for active suspension system

Details Dual acting hydraulic actuator for active suspension system Dual acting hydraulic actuator for active suspension system

1988-04-26

1989-05-09

Kashnikow, Andres

Spring devices

Vehicle

Comprising compressible fluid

267 6413, 267 6417, 267 6426, 267 6428, 2671402, F16F 500

Patent

active

048282308

ABSTRACT:
Active suspension for vehicles with a dual acting hydraulic actuator providing foreshortened overall length for a given amount of stroke. A conventional suspension unit when designed to give appropriate wheel travel protruded through the hood. The cylinder tube of the actuator of this invention makes use of concentric tubes proportioned to provide the same pressure-force relationship in both directions and to be no larger than the conventional unit. This actuator also incorporates a trapped air volume that is separate from the oil volumes. This air volume can be appropriately sized so that an air-spring is created by the moving piston. The air spring is of approximately the correct load an rate for the vehicle. This removes the requirement for carrying static vehicle load from the hydraulic portion of the device, which reduces power consumption. This eliminates the requirement for a coil spring around the actuator to carry these static loads and provides a "limp-home" capability in the event that the hydraulic system becomes damaged.

REFERENCES:
patent: 3041062 (1962-06-01), Bliven
patent: 3149830 (1964-09-01), Broadwell
patent: 3524658 (1970-08-01), Carbon
patent: 3687483 (1972-08-01), Gull et al.
patent: 3836166 (1974-09-01), Bainbridge et al.
patent: 3945300 (1976-03-01), Bourges
patent: 3970292 (1976-07-01), Dachicourt et al.
patent: 4655440 (1987-04-01), Eckert

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