Patent ID: 6817838
Filing Date: 2004-11-16
Classification: F04B

Abstract:
A fuel injection pump comprising:a housing having a cylinder; a moving member slidably and reciprocatingly movable in the cylinder, an inner circumference of the cylinder and an axial end of the moving member forming a pressure chamber; a drive shaft which is rotatably disposed in the housing and whose axial end partly protrudes out of the housing, the drive shaft having a cam member slidably in contact with the moving member; a casing fixed to an outer surface of the housing, the casing being provided at a position adjacent to the housing with a first room into which the axial end of the drive shaft protrudes and at a position remote from the housing with a second room mostly separated from but partly communicating with the first room; a feed pump mechanism accommodated in the first room and connected to the axial end of the drive shaft so that a feed pump is constituted by the first room, the feed pump mechanism and the drive shaft; a filter element accommodated in the second room; a casing cover detachably fixed to so as to be readily detachable from the casing on a side axially opposite to the first room with respect to the filter element for covering the second room so that, when the casing cover is detached from the casing, the filter element may be readily replaced by being drawn out in an axial direction of the drive shaft, the casing cover having a fuel inlet port that extends in parallel to an axial direction of the drive shaft and through which fuel is sucked to the second room and, then, flows via the filter element into the first room where the fuel is pressurized according to rotation of the drive shaft; and a fuel flow-in passage provided in the housing for delivering fuel from the feed pump to the pressure chamber, wherein fuel introduced to the pressure chamber from the feed pump is further pressurized and discharged to outside by the moving member that is driven by the cam member according to rotation of the drive shaft.