Stanadyne Corporation

Charles W Davis

Daniel E Salzgeber

Robert Raufeisen

Charles J Donahue

Gerald R Bouwkamp

Wesley B Gilbert

A fuel injection pump is provided with an improved spill control mechanism to accurately supply a desired fuel charge to an internal combustion engine. The fuel pump includes a rotor having a charge pump for pressurizing measured charges of fuel for delivery to the engine and a cam ring adapted to rotatably receive the rotor and to actuate the charge pump upon rotation of the rotor. The cam ring is angularly adjustable to control the timing of the pressurized fuel delivery to the engine. A spill collar mounted adjacent to the cam ring and adapted to rotatably receive the rotor includes a spill port for diverting fuel flow from the charge pump upon registration of a spill passage in the rotor with the spill port in the collar. A pivotal crank mounted on the cam ring and engageable with the spill collar is provided for adjusting the angular position of the spill collar relative to the cam ring to control the amount of fuel diverted from the charge pump. The fuel pump preferably includes a governor mechanism operable upon rotation of the rotor and operatively connected to the crank for automatically adjusting the angular position of the spill collar to maintain a desired engine speed.

Fuel injection pump with spill control mechanism

This invention relates to fuel injection pumps of the type employed for supplying measured charges of fuel to the nozzles of an associated internal combustion engine. More particularly, the invention relates to such fuel pumps of the rotary distributor type having pumping plungers which are slidably mounted in radial bores of a rotary distributor and are surrounded by a generally circular cam ring having pairs of inwardly directed cam lobes which actuate pairs of pumping plungers inwardly simultaneously for pressurizing the charge of fuel between the plungers to a high pressure. The subject invention overcomes the above problems by angularly spacing a pair of pumping plungers and the cooperating cam lobes as required for the specific engine application and avoids the undesired side loading by creating a hydraulic counterbalancing force which automatically changes as the side loading created by the reaction forces between the cam lobes and the pumping plungers changes with speed and rate of delivery of fuel. This is accomplished without introducing any added moving parts to the pump.

Fuel injection pump

Designs for variably controlling the maximum quantity of fuel which can be delivered by a pumping stroke of pumping plungers are disclosed. These include combinations of resilient and rigid leaf spring arrangements for controlling the maximum pumping stroke with and without speed responsive control valves or cams, to provide excess fuel for starting and for shaping the maximum fuel delivery curve according to speed.

Fuel injection pump and plunger control means therefor

A fuel injection pump having a mechanically adjustable servo valve for controlling the timing of the pumping event is disclosed. A pivoted lever has one end which engages the spring seat of a timing control plunger servo valve which is also subjected to a speed related hydraulic signal and another end which engages a cam clamped on the throttle shaft to pivot the lever according to the rotational position of the shaft. The profile of the cam is such as to retard the timing of the pumping stroke when the charge delivered by the pump is increased so that pressure built up in the pump is delayed and injection pressure is reached at a substantially constant crankshaft angle regardless of variations in speed and load on the engine. The mechanism is failsafe since it cannot interfere with the movement of the throttle shaft to reduce fuel delivery.

Timing control for fuel injection pump

A supply pump comprising a body having an inlet and an outlet both in fluid communication with an interior region of the body which contains two pistons positioned to reciprocate coaxially and which define three variable volume chambers, one between the two pistons and in fluid communication with the inlet, a second between one piston and the outlet and a third between the other piston and the outlet. The pistons have different working areas, and the piston of larger area carries a check valve which allows fluid flow from the chamber between the pistons to the chamber between the larger piston and the outlet. A regulating spring acts between the body and the smaller piston to urge both pistons against a mechanical drive means including a reciprocable rod carried by a tappet contacting a driven cam. During each forward and reverse stroke of the pistons in response to rotation of the cam, supply fluid is drawn into the pump through the inlet and forced out of the pump through the outlet.

Double-acting differential piston supply pump

A rotary distributor fuel injection pump is provided with a main high pressure pumping chamber and an auxiliary high pressure pumping chamber which have a common inlet and outlet passage. The pumping plungers in said pumping chambers operate in unison to generate simultaneous high pressure pulsed charges of fuel within the pumping chambers. Both pumping chambers are connected to deliver their high pressure outputs simultaneously to the output passage for delivery sequentially to each of the cylinders of an associated engine. A speed responsive valve controls the delivery of the output from the auxiliary pumping chamber to the common outlet passage and isolates the auxiliary chamber from the common inlet and outlet passage without impairing the connection of the main pumping chamber with the common inlet and outlet passage when engine speed reaches a predetermined level. A valving arrangement is provided to maintain the auxiliary pumping chamber in its isolated condition until the engine is essentially stopped.

A liquid fuel injection pump for supplying timed charges of fuel to an engine by timed pumping strokes includes an adjustable timing mechanism for changing the timing of the pumping strokes. The timing mechanism includes an advance piston which is variably positionable in response to two different hydraulic control pressures. A speed related control pressure operates a servo mechanism associated with the advance piston to provide a component of speed advance. The reference position of a servo spring associated with the servo mechanism is varied by the second control pressure acting against a piston which mounts the spring and which is biased to a position of relatively advanced timing, thereby to add a component of advance which modifies or supplements the speed advance. The second control pressure is correlated with engine load and/or acceleration and in one embodiment is derived from the positioning of the fuel metering means and in another embodiment is derived from the intake manifold air pressure such as that from a turbocharged engine so that the timing is relatively advanced at low loads and during acceleration, and is relatively retarded at higher loads. A gate controlled by the position of a fuel limiting plunger coacts with the advance piston's servo mechanism to prevent advance of the advance piston during engine cranking, and maximum fuel delivery per pumping stroke is controlled according to intake manifold air pressure.

Fuel injection pump and timing control therefor

The present invention provides a liquid fuel injection pump suited for the sequential delivery of measured charges of liquid fuel under high pressure to an associated engine in timed relationship therewith comprising pump chamber means wherein the charges are pressurized to high pressure, a passage for delivering the fuel to said pump chamber means, a metering valve in said passage for reglating the amount of fuel in said measured charges of fuel, said metering valve comprising a pair of relatively movable members respectively having ports in the adjacent surfaces thereof adapted for registry, means to vary the amount of overlap of said ports in a first direction to control the quantity of fuel in each measured charge of fuel in accordance with the load on the associated engine, and means for controlling the relative movement of said members in a second direction transverse to said first direction to vary the amount of overlap of said ports in said second direction in accordance with the speed of the associated engine whereby the amount of overlap in said second direction increases with increased engine speed thereby to maintain the quantity of fuel in sequential charges of fuel at a substantially constant level for a given setting of said means regardless of changes in engine speed.

Fuel injection pump and governor and timing control system therefor

This invention relates to improved fuel injection apparatus for compression-ignition engines and the like and more particularly to a novel and improved check valve arrangement for a rotary distributor fuel injection pump of the type employed for the delivery of a measured amount of fuel to each of the cylinders of an associated internal combustion engine.

Fuel injection pump and replaceable check valve therefor

A multiple plunger fuel injection pump includes a pair of axially positionable interconnected control sleeves encircling each plunger for controlling the quantity and timing of fuel delivered by the plunger. Speed and load response actuators are operative to control the axial positioning of each sleeve of each pair of control sleeves. Adjustment means are provided for separately adjusting, during operation of the injection pump, the axial positioning of each sleeve to balance the timing and quantity of fuel delivered by each plunger with respect to the other plungers.

Multiple plunger fuel injection pump

A fuel injection pump with a control system for regulating the quantity and timing of the delivery of fuel to an associated engine is disclosed. In the control system, three pistons, slidably mounted in parallel bores, are provided. One of the pistons is powered so that it assumes an axial position indicative of engine speed. A second piston is powered to assume an axial position indicative of the quantity of fuel being delivered by the pump. The first and second pistons are each provided with a cam surface, and cam followers controlled thereby interconnect these pistons with the third piston to control the axial position of the third piston and the timing of delivery of fuel by the pump. A second cam surface on the speed positioned piston is connected to a variable stop which varies the maximum amount of fuel which can be delivered by the pump in accordance with speed and a second cam surface on the fuel quantity positioned piston actuates a feedback control to adjust the amount of fuel delivered by the pump so as to maintain the selected engine speed. Various additional modifying or override controls are provided to selectively modify the operation of the pump in accordance with other parameters, such as manifold air pressure, or during starting, or in case of malfunction.

Fuel injection pump and injection control system therefor

There is disclosed a rotary distributor type liquid fuel injection pump for delivering measured charges of fuel under high pressure sequentially to the cylinders of an associated engine in timed relation therewith. The pump includes a movable metering valve for regulating the quantity of fuel in the charges. The metering valve also controls a normally closed bypass port which is opened by the metering valve as the metering valve approaches its closed position to continue the circulation of cool fuel from the supply tank through the pump whenever the metering valve is closed as during the downhill coasting of the vehicle on which the pump is mounted.

Growing community of inventors

Simsbury, CT, United States of America

Charles W Davis