Motor-driven compressor and mounting method for motor-driven compressor

A method for mounting a stator core in a motor-driven compressor with a cluster block attached to the stator core, the motor-driven compressor including:

• a housing;
• a compressing portion accommodated in the housing;
• an electric motor that is accommodated in the housing and serves as a drive source for the compressing portion;
• a drive circuit for actuating the electric motor;
• a conductive member through which the drive circuit and the electric motor are electrically connected to each other;
• a lead wire extended from the electric motor;
• a cluster block accommodated in the housing;
• a connection terminal that is arranged in the cluster block and electrically connects the conductive member and the lead wire to each other;
• a stator core that is a component of the electric motor and has an outer peripheral surface, the stator core having an insertion hole that has an opening in the outer peripheral surface of the stator core and a cornered portion in the stator core;
• an insertion piece that is formed with the cluster block and inserted into the insertion hole via the bent portion;
• the cluster block being attached to the stator core through engagement between the insertion hole and the insertion piece;
• a rotor that is accommodated in the housing and is a component of the electric motor;
• a rotary shaft that is accommodated in the housing and rotates integrally with the rotor, wherein
• the compressing portion, the electric motor, and the drive circuit are arranged sequentially in this order along the axial direction of the rotary shaft, the lead wire being extended from a side of the electric motor facing the compressing portion,
• the housing includes a motor housing member for accommodating the electric motor,
• the motor housing member has a tubular shape including an opening at one end, the motor housing member including a space forming portion that defines a space for accommodating the cluster block in the motor housing member at a position between the space forming portion and the outer peripheral surface of the stator core,
• the method comprising:
• heating the motor housing member to expand the whole motor housing radially outward;
• arranging the cluster block in the space by positioning the cluster block attached to the stator core at a position for inserting the cluster block into the space and then inserting the stator core into the motor housing member via the opening;
• and
• mounting the stator core in the motor housing member by decreasing the temperature of the motor housing member to contract the motor housing member radially inward and cause the motor housing member to contact the stator core in a pressed manner.