FUEL PUMP AND FUEL SUPPLY SYSTEM OF INTERNAL COMBUSTION ENGINE

摘要

In order to provide a fuel pump capable of effectively suppressing a generation of fuel vapor by reducing heat which is transferred from the pump body to the fuel therein, the fuel pump includes a pump body in which a fuel introduction passage and a fuel pressurizing chamber are formed, and a pressurizing pump mechanism having an outer end lubricated by oil and operative to pressurize and discharge the fuel in the pressurizing chamber by a power inputted to the outer end. The pump body includes a fuel accommodation portion formed with at least part of the fuel introduction passage, and a barrier wall portion for regulating the oil from being introduced into the fuel accommodation portion. The fuel accommodation portion and the barrier wall portion are connected with each other through a heat transmission path which is provided therein with a heat transmission member having a higher heat transfer performance than that of a material forming the pump body, the heat transmission member includes a connecting part exposed to the outside of the pump body.

主权项

1. A fuel pump comprising:
a pump body in which a fuel introduction passage for introducing fuel from an outside and a pump operation chamber for introducing the fuel through the fuel introduction passage are formed; and a pressurizing pump mechanism having an input part lubricated by oil from the outside and operative to pressurize and discharge the fuel in the pump operation chamber by a power inputted to the input part, wherein the pump body includes a fuel accommodation portion formed with at least part of the fuel introduction passage, and a barrier wall portion for regulating the oil from being introduced into a fuel accommodation portion, and wherein the fuel accommodation portion and the barrier wall portion are connected with each other through a heat transmission path which is provided therein with a heat transmission member having a higher heat transfer performance than that of a material forming the pump body, the heat transmission member includes a connecting part exposed to the outside of the pump body.