Patent ID: 8257064

Claim:
A fuel supply pump comprising: a pump portion that pressurizes fuel sucked into a pump chamber and discharges the pressurized fuel; and a motor portion including an inner rotor that drives the pump portion, an outer stator that is disposed so as to surround an outer periphery of the inner rotor in a circumferential direction, and a housing that is disposed to surround an outer periphery of the outer stator in the circumferential direction, wherein at one end of the housing, there is arranged the pump portion, at the other end of the housing, there is arranged a synthetic resin-made end cover that has a discharge passage formed therein, wherein the outer stator includes a stator core, which is disposed with a gap formed between the stator core and the outer periphery of the inner rotor, and a stator coil wound on the stator core, the gap is used as a first fuel supply passage for passing the fuel discharged from the pump portion, the motor portion has, between the outer periphery of the outer stator and an inner periphery of the housing, a clearance that extends, at least, in an axial direction of a rotating shaft of the motor portion, the clearance is used as a second fuel supply passage for passing the fuel discharged from the pump portion, the end cover is integrally formed with a resin mold that covers the stator coil, and the resin mold has a plurality of axial portions that join and are interposed between outermost surfaces of the outer stator and an inner surface of the housing and divide the second fuel supply passage into a plurality of sections, each of the plurality of sections being defined between circumferentially adjacent pairs of the axial portions of the resin mold, and where the second fuel supply passage sections do not extend outward in a radial direction beyond a cylindrical surface defined by outer surfaces of the axial portions, and there is formed, around an end portion of the rotating shaft, a fuel converging portion on which all the fuel flowing out of the first and second fuel supply passages converge, the first fuel supply passage directly communicates with the fuel converging portion, the second fuel supply passage communicates with the fuel converging portion via a plurality of connection passages that are formed in the end cover, the connection passages each radially extend to fluidically connect the second fuel supply passage to the fuel converging portion and are spaced from one another in the circumferential direction, and the fuel converging portion also communicates with the discharge passage formed in the end cover so that the fuel discharged from the pump portion is led to the discharge passage through the first and second fuel supply passages, the connection passages and the converging portion.