Patent ID: 8006673
Filing Date: 2011-08-30
Classification: F02M

Abstract:
1. A fuel injection pump comprising: a low-pressure pump portion configured to pump fuel from a fuel tank; a pressure regulating valve configured to control pressure of fuel discharged from the low-pressure pump portion; a high-pressure pump portion configured to pressurize fuel discharged from the low-pressure pump portion to press-feed the fuel; a valve cover having a mounting portion, which is configured to be mounted with the pressure regulating valve; and a fuel filter through which the high-pressure pump portion is configured to draw fuel discharged from the low-pressure pump portion, wherein the pressure regulating valve is configured to release fuel pressure applied to the fuel filter such that the fuel pressure applied to the fuel filter becomes less than predetermined pressure, wherein the high-pressure pump portion includes a cylinder, a movable member, and a camshaft, the cylinder defines a high-pressure pump chamber for compressing fuel, the movable member is configured to move to pressurize fuel in the high-pressure pump chamber to press-feed the fuel, the camshaft is configured to move the movable member, the low-pressure pump portion includes a rotatable member and a pump cover, the rotatable member is rotatable integrally with the camshaft, the pump cover accommodates the rotatable member, the pump cover is fixed to the pump housing, the valve cover is a separate component from the pump housing and the pump cover, the pressure regulating valve includes a valve element configured to open the pressure regulating valve in response to pressure of fuel, the valve cover has an outlet port and a communication passage, the outlet port is configured to discharge fuel, which is pressurized in the low-pressure pump portion, the communication passage is configured to communicate a pressure receiving side of the valve element with the outlet port, a longitudinal direction of the pressure regulating valve is at an angle with respect to an axial direction of the camshaft, the valve cover and the pump cover are fixed to the pump housing via a common fixing member, the valve cover is formed from a first material, the pump cover is formed from a second material, the first material is lower than the second material in hardness, the valve cover has a triangular shape when viewed in the axial direction of the camshaft, and the valve cover has a fuel outlet port located nearer to one of three corners of the triangular shape thereof than to the other two of those three corners.