Regulatable fan drive
First Claim
1. A regulatable drive for the cooling fan (1) of an internal combustion engine/14 comprising a tank (7) for holding a fluid, a pump (5) and a fluid motor (3) in sequential connection whereby fluid from said tank is pumped to said fluid motor for driving said fan, said pump having a suction side connecting to said tank and said fluid motor having a suction side connecting to the pressure outlet of said pump;
- the improvement which comprises;
pump suction passage means (8A, 8B) from said tank to the suction side of said pump, and a regulatable valve means (9) in said pump suction passage means;
a fluid motor suction passage means (4) from the pressure outlet of said pump to the suction side of said fluid motor;
a bypass passage (10) connecting said latter passage means (4) to said regulatable valve means (9);
said regulatable valve means comprising movable control means (16) movable from a position to effect flow from said tank to the suction side of said pump and thence to said fluid motor to drive said fan, and in another position to bypass flow through said bypass passage from the pressure outlet of said pump to therethrough via said regulatable valve means to regulate fan speed.
1 Assignment
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Accused Products
Abstract
A regulatable drive for speed control of the cooling fan of an internal combustion engine comprises fluid feed from a tank to the suction side of a pump via a suction passage wherein flow is controlled by a regulatable multi-position valve. The pump provides pressure feed to the suction side of a fluid motor that operates the fan. A bypass passage connects the suction passage of the fluid pump through the regulatable valve to the suction side of the fluid motor. The regulatable valve is actuated for control of suction feed to the pump responsive to fan speed via control circuitry which may also be responsive to engine temperature.
18 Citations
14 Claims
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1. A regulatable drive for the cooling fan (1) of an internal combustion engine/14 comprising a tank (7) for holding a fluid, a pump (5) and a fluid motor (3) in sequential connection whereby fluid from said tank is pumped to said fluid motor for driving said fan, said pump having a suction side connecting to said tank and said fluid motor having a suction side connecting to the pressure outlet of said pump;
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the improvement which comprises; pump suction passage means (8A, 8B) from said tank to the suction side of said pump, and a regulatable valve means (9) in said pump suction passage means; a fluid motor suction passage means (4) from the pressure outlet of said pump to the suction side of said fluid motor; a bypass passage (10) connecting said latter passage means (4) to said regulatable valve means (9); said regulatable valve means comprising movable control means (16) movable from a position to effect flow from said tank to the suction side of said pump and thence to said fluid motor to drive said fan, and in another position to bypass flow through said bypass passage from the pressure outlet of said pump to therethrough via said regulatable valve means to regulate fan speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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- 11. A method of regulating the speed of a cooling fan for an internal combustion engine wherein said fan is driven by a fluid motor in turn driven by a pump, which method comprises regulating suction feed to said pump responsive to fan speed so that suction feed is always sufficient to effect lubrication of said pump but during pump idling is insufficient to effect pressure to operate said fluid motor.
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14. A method of regulating speed of a cooling fan for an internal combustion engine, wherein said fan is driven by a fluid motor driven by a pump, which method comprises regulating suction feed to said pump responsive to temperature of said internal combustion engine so that suction feed is always sufficient to effect lubrication of said pump but during pump idling is insufficient to effect pressure to operate said fluid motor.
Specification