Maintaining hydrostatic system control pressure

Details Maintaining hydrostatic system control pressure Maintaining hydrostatic system control pressure

1982-03-24

1984-01-17

Garrett, Robert E.

Power plants

Pressure fluid source and motor

Apparatus having means responsive to or ameliorating the...

60430, 60444, 60452, 60455, 138114, F16D 3900

Patent

active

044257589

ABSTRACT:
A hydrostatic transmission (10) includes a variable displacement pump (12) for driving a fluid motor (14) in first and second directions. First and second high pressure conduits (20,22) connects the pump (12) and motor (14) in a continuous fluid circuit. A control pump (40) supplies make-up fluid to the first and second high pressure conduits (20,22) and simultaneously provides pressurized control fluid to a system control (50) for controlling the operation of the hydrostatic transmission (10). First and second low pressure conduits (24,26) are respectively disposed about the first and second high pressure conduits (20,22) and defines first and second spaces (28,30) therebetween. A pressure control arrangement (32) is connected to the first and second spaces (28,30) to control the maximum pressure level in the spaces (28,30) upon the failure of one of the high pressure conduits (20,22). By controlling the pressure level in the spaces (28,30), pressurized control fluid is maintained for the system control (50).

REFERENCES:
patent: 2838074 (1958-06-01), Lauck
patent: 3299417 (1967-01-01), Sibthorpe
patent: 3528243 (1970-09-01), Cryder et al.
patent: 4149568 (1979-04-01), Kuntz et al.
patent: 4265235 (1981-05-01), Fukunaga

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