Fuel injection pump with metering valve controlled cooling
AssigneeStanadyne, Inc.
InventorsDaniel Salzgeber, Robert Raufeisen, Charles W. Davis
Life of this patent
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Abstract
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.
Claims5
A liquid fuel injection pump comprising a supply tank, a low pressure supply pump having an inlet connected to said supply tank, a rotor mounting a high pressure pump which pressurizes measured charges of fuel for sequential delivery to the cylinders of an associated engine in timed relation therewith, a first passage connecting the outlet of said supply pump and said high pressure pump, a movable metering valve in said passage for controlling the restriction offered by a metering port to control the fuel delivered to said high pressure pump, and a bypass passage connecting said first passage to said supply tank and having a normally closed bypass port opened by said metering valve as said metering valve approaches its closed position to continue the circulation of new fuel from said tank through the fuel injection pump whenever said metering valve is closed.
Dependencies are inferred from the claim text.