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US 4,083,345 AGranted
Fuel injection pump
AssigneeStanadyne, Inc.
InventorCharles W. Davis
Life of this patent
Estimating the term…
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AssigneeStanadyne, Inc.
InventorCharles W. Davis
Estimating the term…
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 rotary distributor fuel injection pump suited for the delivery of pulsed charges of high pressure fuel sequentially to the cylinders of an associated engine comprising a main high pressure pumping chamber and an auxiliary high pressure pumping chamber having a common outlet passage for the delivery of pressurized fuel generated in the pumping chambers to an associated engine, pumping plungers in said pumping chambers having simultaneous pumping strokes for generating high pressure pulsed charges of fuel therein, actuating means for powering said pumping plungers to generate the pulsed charges of fuel in the chambers simultaneously and deliver their combined pulsed output sequentially to each of the cylinders of the engine, and disabling means for rendering said auxiliary pumping chamber inoperative to delivery its output to said common outlet passage without impairing the connection of the main pumping chamber thereto after the enginer speed reaches a predetermined level.
The fuel injection pump of claim 11 including means for generating a hydraulic pressure correlated with engine speed and wherein said valve is biased toward a first position connecting the auxiliary pumping chamber to the common outlet passage, said valve further being subjected to the force of the speed correlated hydraulic pressure to move the valve to a second position wherein said auxiliary chamber is isolated from said common output passage when said predetermined speed is reached, said hydraulic pressure being first applied to one area to initiate the movement of said valve to its second position at said predetermined speed and then applied to a larger area to maintain said valve in said second position and prevent said valve from returning to said first position until engine speed decreases to a level substantially lower than said predetermined speed.
Dependencies are inferred from the claim text.