Patent ID: 9581164
Date: 2017-02-28
CPC Classifications: F04D,H02K,Y10T

Claim:
1. A manufacturing method for a fuel pump, the fuel pump comprising: a housing in a tubular shape; a pump cover equipped to one end of the housing, the pump cover having an inlet port for drawing fuel; a cover end equipped to an other end of the housing, the cover end having an outlet port for discharging fuel; a stator in a tubular shape, the stator equipped with a plurality of windings, the stator having a plurality of ribs, which are configured to make contact with an inner wall of the housing when accommodated in the housing; a rotor rotatable on a radially inside of the stator; a shaft coaxial with the rotor and rotatable integrally with the rotor; and an impeller equipped to an end of the shaft on a side of the pump cover, the impeller rotatable with the shaft to pressurize fuel flowing from the inlet port and to discharge fuel through the outlet port, the manufacturing method comprising: applying force from a radially outside to a plurality of first portions of a sidewall of the housing on a radially outside to elastically deform the housing in a deformation process, the housing being formed of a metallic material in an annular form in cross section perpendicular to a center axis; inserting the stator into the housing, such that the ribs, which are formed of resin, are enabled to make contact with second portions of the sidewall of the housing, the second portions being elastically deformed radially outward, in an insertion process subsequent to the deformation process; and releasing application of the force to cause the ribs to make contact with the inner wall of the housing, in an affixation process subsequent to the insertion process, wherein the sidewall of the housing, with which the ribs make contact, is in the annular form in cross section perpendicular to the center axis, wherein in the affixation process, each of the ribs makes contact with the inner wall to form a cover-end-side gap and a pump-cover-side gap with the inner wall at portions, which are adjacent to the rib in a direction of the center axis, the cover-end-side gap is located on a side of the cover end, the pump-cover-side gap is located on a side of the pump cover, in the affixation process, the stator makes contact with the inner wall at a contact portion, and the contact portion is located on an opposite side of the cover-end-side gap from the rib in the direction of the center axis.