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US 6,629,411 B2Granted
Dual displacement motor control
AssigneeValeo Electrical Systems, Inc.
InventorsJeffrey J. Buscher, John R. Gibson, John S. Hill, Hong Jiang, David F. Nickel, Daniel J. Schutte
Life of this patent
Estimating the term…
Abstract
A hydraulically operated fan for a cooling system in an automotive vehicle. Two hydraulic motors drive a common fan shaft. A control system provides means to bypass flow in parallel with both motors or direct flow to both or one of the motors dependent on inlet flow and cooling signal conditions.
Claims30
A valve for use in a hydraulic system comprising a first hydraulic load and a second hydraulic load:
- a valve body having a plunger biased by a spring to a home position;
- said plunger being seated in said valve body and having a first area on a first side of said plunger and a second area on a second side of said plunger;
- said valve body assembly comprising a passageway in communication with said first and second area and said valve body controlling fluid flow to said first and second hydraulic loads;
- said valve body controlling flow to said first and second hydraulic loads to drive a common load in response to a plurality of pressures and a single control input.
1 more element
A valve assembly comprising:
- a single valve housing for housing a first valve;
- a second valve responsive to a control input to control said first valve, thereby controlling an amount of flow to a plurality of loads, each of said plurality of loads being coupled to a common load;
- said single valve housing comprising a restrictor in order to restrict flow to a load bypass and at least one of said plurality of loads, said restrictor being responsive to a plurality of pressures and said second valve being responsive to said control input to control flow to said plurality of loads.
A valve assembly comprising:
- a single valve housing for housing a first valve;
- a second valve responsive to a control input to control said first valve, thereby controlling an amount of flow to a plurality of loads;
- said single valve housing comprising a restrictor in order to restrict flow to at least one of said plurality of loads;
- and
- a second restriction in parallel with one of the loads;
- wherein said second restriction is a check valve.
3 more elements
A valve assembly comprising:
- A valve assembly comprising:
- a single valve housing for housing a first valve;
- a second valve responsive to a control input to control said first valve, thereby controlling an amount of flow to a plurality of loads;
- said single valve housing comprising a restrictor in order to restrict flow to at least one of said plurality of loads;
- a first port coupled to a first load;
- a second port coupled to a second load;
- a third port coupled to a bypass:
- said second valve controlling flow to said first, second and third ports in response to said input control signal;
- a pilot valve;
- said restrictor operative to at least partially or fully restrict flow to each of said ports;
- and
- wherein said restrictor opens and closes flow to one of said first, second and third ports sequentially.
9 more elements
Dependencies are inferred from the claim text.