FUEL INJECTION PUMP

摘要

The present invention provides a fuel injection pump which pressurizes and discharges fuel that is drawn in a low-pressure state, the fuel injection pump including a pump housing having a valve holder in which an inlet valve, an outlet valve, and a relief valve are arranged in an interior and a pump chamber is formed between the inlet valve and the outlet valve and a plunger that pressurizes or depressurizes the pump chamber, in which the relief valve is provided on a downstream side of the outlet valve and is configured as a valve for returning the fuel to an upstream side of the outlet valve, and a portion of a passage on the upstream side of the outlet valve and a passage from the downstream side of the outlet valve to an upstream side of the relief valve are separately formed in a same space in the valve holder. The present invention can reduce the number of components of the fuel injection pump and reduce cost.

主权项

1. A fuel injection pump which pressurizes and discharges fuel that is drawn in a low-pressure state, the fuel injection pump comprising:
an inlet valve arranged in an interior of the fuel injection pump; an outlet valve arranged in the interior of the fuel injection pump; a relief valve arranged in the interior of the fuel injection pump; and a pump housing having a valve a plunger, the valve holder having a pump chamber formed between the inlet valve and the outlet valve and the plumber pressurizing or depressurizing the pump chamber, wherein the relief valve is provided on a downstream side of the outlet valve and is configured as a valve for returning the fuel to an upstream side of the outlet valve, the valve holder includes a seat having a portion of a passage on the upstream side of the outlet valve and a passage from the downstream side of the outlet valve to an upstream side of the relief valve as separate passages, and the portion of the passage on the upstream side of the outlet valve and the passage from the downstream side of the outlet valve to the upstream side of the relief valve are formed offset from each other in the seat.