Motor vehicles – Motor-carrying attachments – Driven steering wheel type
Patent
1979-07-25
1981-07-21
Mitchell, David M.
Motor vehicles
Motor-carrying attachments
Driven steering wheel type
180 14R, 180266, 280 61, 280 6H, 280111, 280112R, 280483, 280484, 280492, 280702, B60D 702, B60G 1130, B60G 1706, B60G 1708
Patent
active
042793190
ABSTRACT:
A control circuit for controlling the hydraulic suspension system of an articulated vehicle having a first pair of hydraulic cylinders operatively connected between a drive axle and a tractor frame to control vertical bounce movement of the axle, and a second pair of hydraulic cylinders operatively connected between a tractor and a trailer portion of the articulated vehicle for controlling relative roll movement therebetween. A first valve system directs hydraulic fluid under a first pressure to the head ends of the hydraulic cylinders for supporting the weight of the vehicle and load, and to dampen the bounce motion of the drive wheels and the relative roll motion between the tractor and trailer portions of the articulated vehicle. A gas precharged accumulator and a plurality of flow restrictors disposed in this portion of the circuit, control and spring and viscous damping rates of the cylinders. A pressure reducer communicates hydraulic fluid under a second pressure, lower than the first pressure, to the rod ends of the hydraulic cylinders and to a second gas precharged accumulator. The second gas precharged accumulator functions to insure that the rod ends of the hydraulic cylinders remain oil filled, which allows double action of the cylinders and provides cushioning for the rebound portion of the system.
A sensor system maintains an oil pressure differential between the high and low pressure circuits effective to maintain a range of predetermined vertical positions of the portions of the vehicle regardless of the weight of the load being received, carried by, or discharged from the scraper bowl. A selectively activated lockout switch is controlled by the vehicle operator to actuate a second valve system for hydraulically fixing the bounce damping control cylinders in position to isolate them from the spring and viscous damping portions of the control system. Fluid flow between the roll damping hydraulic cylinders is uninterrupted to maintain control of the relative roll motion between the articulated vehicle members.
REFERENCES:
patent: 2720417 (1955-10-01), Kling
patent: 3118686 (1964-01-01), McAdams
patent: 3135529 (1964-06-01), Conrad
patent: 3549168 (1970-12-01), Swanson
patent: 3643970 (1972-02-01), Gauchet
patent: 3827518 (1974-08-01), Kuhl et al.
patent: 3869141 (1975-03-01), Ito et al.
patent: 3953040 (1976-04-01), Unruh et al.
patent: 4045050 (1977-08-01), Hawk
Brown Robert A.
Fiat-Allis Construction Machinery, Inc.
McGiehan Donn
Mitchell David M.
Roehrig, Jr. August E.
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