Electric comprssor and method for assembling electric compressor

Abstract

An electric compressor and a method for assembling the same include: an electric motor unit including a stator fixed to a housing by a press-fitting to an inner peripheral wall of the housing and a rotor rotatably arranged inside the stator; a compression unit configured to be driven by a rotational drive force of the electric motor unit and compress a coolant; and a guide member attached to an outer periphery of the stator and having a guiding curved surface portion configured to guide the press-fitting of the stator to the inner peripheral wall of the housing.

1 . An electric compressor comprising:
 a cylindrical housing;   an electric motor unit fixed inside the housing and including a stator and a rotor, the stator being fixed to the housing by a press-fitting of the stator to an inner peripheral wall of the housing and configured to generate a magnetic force upon energization of the stator, the rotor being rotatably arranged inside the stator and configured to be rotated by the magnetic force generated by the stator;   a compression unit arranged in the housing and configured to be driven by a rotational drive force of the electric motor unit and compress a coolant; and   a guide member attached to an outer periphery of the stator and made of a thin plate material having a guiding curved surface portion configured to guide the press-fitting of the stator to the inner peripheral wall of the housing.   
     
     
         2 . The electric compressor according to  claim 1 , wherein the guiding curved surface portion has a curved surface extending in a direction toward a center of the stator from an end portion of the stator from which the stator is inserted into the housing. 
     
     
         3 . The electric compressor according to  claim 1 , wherein the guide member includes a displacement preventing portion extending from the guiding curved surface portion and configured to prevent a displacement of the guide member in an axial direction of the guide member in the press-fitting of the stator to the inner peripheral wall of the housing. 
     
     
         4 . The electric compressor according to  claim 1 , wherein the guide member includes:
 an interference portion formed in a shape elongated in an axial direction of the stator and press-fitted to the inner peripheral wall of the housing, the interference portion being connected to the guiding curved surface portion at an insertion-side end portion of the interference portion from which the interference portion is inserted into the inner peripheral wall of the housing; and   a locking-holding portion provided in an end portion of the interference portion on an opposite side to the insertion-side end portion and configured to hold the stator.   
     
     
         5 . The electric compressor according to  claim 1 , wherein
 a plurality of the guide members are provided, and   the guide members are attached at equal intervals along a circumferential direction of the stator.   
     
     
         6 . The electric compressor according to  claim 1 , wherein a section of the inner peripheral wall of the housing facing a non-attachment section of the outer periphery of the stator where no guide member is attached is offset toward an outer peripheral side of the housing with a gap from the non-attachment section of the stator. 
     
     
         7 . The electric compressor according to  claim 1 , wherein the guide member includes:
 a plurality of guide pieces each having the guiding curved surface portion, and   a connection piece connecting the guide pieces to each other in the guiding curved surface portions.   
     
     
         8 . The electric compressor according to  claim 7 , wherein the guide member has a curved surface shape along a circumferential direction of the stator and includes a slit formed in an axial direction of the guide member. 
     
     
         9 . A method for assembling an electric compressor, the electric compressor including: a cylindrical housing; an electric motor unit fixed inside the housing and including a stator and a rotor, the stator being fixed to the housing by a press-fitting of the stator to an inner peripheral wall of the housing and configured to generate a magnetic force upon energization of the stator, the rotor being rotatably arranged inside the stator and configured to be rotated by the magnetic force generated by the stator; and a compression unit arranged in the housing and configured to be driven by a rotational drive force of the electric motor unit and compress a coolant, the method comprising:
 attaching guide members made of a thin plate material to at least three positions of an outer periphery of the stator; and   guiding a press-fitting of the stator to the inner peripheral wall of the housing by using guiding curved surface portions of the guide members as attached.