Power plants – Pressure fluid source and motor – Condition responsive control of pump or motor displacement
Patent
1976-07-29
1977-08-09
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Condition responsive control of pump or motor displacement
60448, 60462, F16H 3946
Patent
active
040402550
ABSTRACT:
For automatically terminating the operation of the vibrator in a self-propelled roller compactor when the vehicle is at rest or travelling slowly, a variable displacement pump driving the hydraulic motor of the vibrator is provided with a servo control mechanism including a spring-neutralized linear actuator capable of adjustably varying the per-cycle displacement of the pump by receiving hydraulic fluid pressure from another pump. Provided between the servo control mechanism and the said other pump is an on-off valve which is closed when the vehicle speed becomes less than a predetermined value, with the result that the actuator is neutralized to zero the displacement of the variable displacement pump. The on-off valve can be operated from an operator controlled shift lever, so as to be closed when the lever is in or adjacent a neutral position.
REFERENCES:
patent: 2443345 (1948-06-01), Ernst
patent: 2466604 (1949-04-01), MacMillin et al.
patent: 3214911 (1965-11-01), Kempson
patent: 3932993 (1976-01-01), Riedhammer
patent: 3986358 (1976-10-01), Hoffmann
Geoghegan Edgar W.
Kabushiki Kaisha Komatsu Seisakusho
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