Patent ID: 8911220

Claim:
An electric fluid pump, comprising: a casing; a rotor arranged in the casing; and a shaft member supported by the casing and including a shaft portion extending in the casing in a direction of an axis of the shaft member, having a first end portion arranged at one axial end of the shaft member and a second end portion arranged at the other axial end of the shaft member, and supporting the rotor, a collar portion arranged at the first end portion of the shaft portion and having an outer diameter larger than an outer diameter of the shaft portion, and a stepped section positioned closer to the second end portion of the shaft portion than the collar portion, and including an outer diameter smaller than the outer diameter of the collar portion and larger than the outer diameter of the shaft portion, the stepped section being configured to have an end face facing toward the second end portion of the shaft portion and serving as a bearing surface on which the rotor is rotatably supported, the collar portion possessing a first axial end face facing towards the first end portion of the shaft and a second axial end face facing towards the second end portion of the shaft portion, the collar portion being embedded in the casing so that material forming the casing contacts both the first axial end face and the second axial end face, wherein the casing includes a partial surface of an outer surface, the partial surface facing the first axial end face of the collar portion and being spaced apart from the first axial end face of the collar portion, the first end portion of the shaft portion includes an end surface facing the partial surface of the outer surface of the casing and being spaced apart from the partial surface of the outer surface of the casing, the end surface of the first end portion of the shaft portion contacts the material forming the casing and contacting both the first axial end face and the second axial end face of the collar portion, and the bearing surface of the stepped section is coplanar with an inner surface of the casing and serves as a standard for positioning the shaft member relative to the casing.