Hydraulic pump
AssigneeStanadyne, Inc.
InventorIlija Djordjevic
Life of this patent
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Abstract
A supply pump for continuously supplying pressurized fuel to an accumulator-type injector system employs an electrically controlled metering valve for regulating the supply of fuel to the pump chamber. The output pressure of the pressurized fuel from the pump is regulated by means of a relief valve assembly. The inlet metering valve also controls the operation of the relief valve assembly. The relief valve assembly comprises a hydraulically controlled piston which selectively controls the position of a valve member for releasing pressurized fuel from the outlet portion of the pump so that the pressurized fuel in the injection system may be regulated by controlling the fuel supply to the pump chamber and by also releasing pressurized fuel from the pressurized injection system.
Claims16
A hydraulic pump for pressurizing fluid comprising:
- a housing;
- stator means mounted in said housing in fixed position therewith to form a pump chamber, a delivery passage connecting said pump chamber and at least one plunger bore opening into said pump chamber;
- supply means including an inlet and a supply passage to transfer fluid from said inlet through said supply passage to said pump chamber;
- pump plunger means reciprocable in said at least one plunger bore to pressurize fluid in said pump chamber;
- rotor means rotatable in said housing to reciprocate said plunger means;
- output receiver means to receive pressurized fluid from said delivery passage;
- relief valve means comprising a variable pressure relief valve and a valve control passage to control the pressure in said output receiver means by selectively releasing fluid therefrom;
- and
- inlet metering means comprising a metering valve interposed in said supply passage and selectively positionable to meter the fluid supplied to said pump chamber and to control the operation of said relief valve means by selectively controlling the pressure in said control passage to thereby control the opening pressure of said relief valve wherein the metering valve is positionable to simultaneously decrease the fluid supplied to the pump chamber and to decrease the opening pressure of the release valve.
A supply pump for pressuring fuel for delivery to a fuel injection system of an associated internal combustion engine comprising;
- a housing;
- stator means mounted in said housing in fixed position therewith to form a pump chamber, a delivery passage connecting said pump chamber and at least one plunger bore opening into said pump chamber;
- fuel supply means including a fuel inlet, a supply passage and a transfer pump to transfer fuel from said fuel inlet through said supply passage to said pump chamber;
- pump plunger means reciprocable in said at least one plunger bore to pressurize fuel in said pump chamber;
- rotor means including an actuator means rotatable to actuate said plunger means to sequentially reciprocate said plunger means, said rotor means adapted for being driven by said associated engine;
- fuel outlet means to receive pressurized fuel from said pump chamber for delivery to the injection system of said associated engine;
- relief valve means comprising a variable pressure relief valve and a valve control passage to control the pressure in said fuel output means by selectively releasing fuel therefrom;
- and
- inlet metering means comprising a metering valve interposed in said supply passage and selectively positionable to meter the fuel supplied to said pump chamber and to control the operation of said relief valve means by selectively controlling the pressure in said control passage to thereby control the opening pressure of said relief valve wherein the metering valve is positionable to simultaneously decrease the fluid supplied to the pump chamber and to decrease the opening pressure of the release valve.
Dependencies are inferred from the claim text.