Patent ID: 8333007
Filing Date: 2012-12-18
Classification: F02M,F04D,H02K,Y10T

Abstract:
1. A method for manufacturing a motor device for driving a pump portion of a fuel pump by being magnetized using a permanent magnet circumferentially surrounding the motor device, the method comprising: assembling a rotation axis to a rotor core, which is provided with a coil, to construct an armature; assembling the armature to a commutator to construct a structural assembly, the commutator being substantially in a flat disc shape and having an axial end surface configured to be in contact with a brush to rectify a driving current supplied to the coil; locating the structural assembly between an upper molding die and a lower molding die, the lower molding die having a molding cavity smaller in diameter than a molding cavity of the upper molding die, to thereby define a step having a contact surface, at the contact surface between the upper molding die and the lower molding die; and charging a resin material in a direction parallel to said rotation axis from a first axial end of the rotor core, which is at an opposite end of the rotor core from the commutator, into the molding dies to mold a resin member with the armature and the commutator in a condition where a second axial end of the rotor core, on an end side of the commutator, is in contact with the contact surface of the step.