Fuel pump and fuel supply system of internal combustion engine

摘要

A fuel pump which can suppress fuel bubbles from being sucked into a fuel pressure chamber, and can achieve a stable fuel pressure property. The fuel pump has a pump body formed with a suction passage and a pump operation chamber, and a pressure pump mechanism to pressurize and discharge fuel. The pump body has a lower side wall portion and an upper side wall portion respectively at the vertically lower and upper sides of the inner wall portion forming a suction gallery chamber partly forming the suction passage. The pressure pump mechanism has a valve retaining member having an insertion portion inserted into the suction gallery chamber. The insertion portion has internal suction inlets through which the fuel is sucked from the suction gallery chamber into the pump operation chamber, the internal suction inlets being positioned in the intermediate height area in the suction gallery chamber.

主权项

1. A fuel pump provided with a pump body and a pressure pump mechanism, the pump body being formed with a fuel introduction passage to introduce fuel from the outside and a pump operation chamber to introduce the fuel through the fuel introduction passage, and the pressure pump mechanism having an input portion having power inputted from the outside and discharging the fuel pressurized in a fuel pressure chamber formed in the pump operation chamber when the power is inputted to the input portion,
the pump body having a fuel storage chamber forming part of the fuel introduction passage, a lower side wall portion positioned at a vertically lower side of an inner wall portion partly forming the fuel storage chamber, and an upper side wall portion positioned at a vertically upper side of the inner wall portion partly forming the fuel storage chamber, the pressure pump mechanism having an insertion portion inserted in the fuel storage chamber of the pump body to be positioned vertically between the lower side wall portion and the upper side wall portion of the pump body, the insertion portion having an internal suction inlet in the vertically intermediate height area in the fuel storage chamber to suck the fuel into the pump operation chamber from the fuel storage chamber.