Elevationally adjustable fluid suspension system for a wheel tra

Details Elevationally adjustable fluid suspension system for a wheel tra Elevationally adjustable fluid suspension system for a wheel tra

1981-12-22

1984-05-22

Butler, Douglas C.

Land vehicles

Wheeled

Running gear

37126A, 37DIG1, B60G 1126

Patent

active

044497334

ABSTRACT:
In a tractor-scraper combination having a single-axle two-wheel tractor and an earthmoving scraper articulately joined together, one or two hydraulic suspension jacks are operatively connected between the axle and main frame of the tractor for varying the distance therebetween in accordance with the loaded or empty state of the scraper. Connected between each suspension jack and a pump, a leveling valve normally communicates the pump with some other hydraulic system of the vehicle and, on actuation, selectively communicates the suspension jack with the pump and with a fluid drain. When the bowl of the scraper becomes loaded or unloaded, a pressure sensor connected to a bowl jack actuates a timer, causing same to allow energization of an elevation sensor connected between the axle and main frame of the tractor. The energized elevation sensor puts out a signal representative of the elevation of the tractor main frame above the axle. A solenoid valve responds to the elevation sensor signal by causing a double-acting air cylinder to actuate the leveling valve, with the consequent leveling of the vehicle by the suspension jack. An accumulator in communication with the suspension jack absorbs the normal dynamic motion of the vehicle during travel.

REFERENCES:
patent: 3118686 (1964-01-01), McAdams
patent: 3299547 (1967-01-01), Gee
patent: 3524634 (1970-08-01), Schmidt
patent: 3549168 (1970-12-01), Swanson
patent: 3992039 (1976-11-01), Hiruma
patent: 4050704 (1977-03-01), Duca
patent: 4105216 (1978-08-01), Graham
patent: 4279319 (1981-07-01), Joyce

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