Motors: expansible chamber type – With motive fluid valve – Independent control of bypass between opposed working chambers
Patent
1998-06-08
2000-05-09
Lopez, F. Daniel
Motors: expansible chamber type
With motive fluid valve
Independent control of bypass between opposed working chambers
60406, 92163, F15B 1310
Patent
active
060588268
ABSTRACT:
A power steering cylinder assembly including a cylinder divided by a piston into opposite chambers and a valve controlling flow between a pump, a tank and the chambers. Bypass passages selectively connects the opposite chambers when there is no flow from the pump. The bypass passages includes first and second sets of axial passageways in the wall of the cylinder. Each passageway of the first set of axial passageways having an inlet in the first operating chamber and a first outlet in the exterior of the cylinder. Each passageway of the second set of axial passageways having an inlet in the second operating chamber and a second outlet in the exterior surface of the cylinder. The first and second outlets being in two respective circumferential lines on the exterior surface of the cylinder. A tubular piston has a groove on an inside surface, which is positionable over the first and second outlets of the passageways to allow fluid communication between the two sets of passageways, and movable to prevent communication between the two sets of passageways.
REFERENCES:
patent: 875294 (1907-12-01), Siabloff
patent: 1605250 (1926-11-01), Mackenzie
patent: 2069214 (1937-02-01), Carlson
patent: 3924705 (1975-12-01), Sugisawa
patent: 5048630 (1991-09-01), Schaffer
patent: 5727444 (1998-03-01), Dietrich
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