Electric oil pump

Abstract

An electric oil pump includes a motor part having a shaft, a pump part located on a front side of the motor part and driven via the shaft, and a control part which controls the motor part. The motor part includes a rotor, a stator, and a motor housing having a cylindrical portion which accommodates the rotor and the stator. The pump part includes a pump rotor, and a pump housing which accommodates the pump rotor. The control part includes a substrate having a surface on which a plurality of electronic components are mounted. The surface of the substrate is disposed to face the cylindrical portion and extends in the axial direction. A coil, which is provided on the stator, and the substrate are electrically connected via a connecting bus bar assembly. The connecting bus bar assembly is disposed between the cylindrical portion and the substrate.

What is claimed is: 
     
         1 . An electric oil pump comprising:
 a motor part having a shaft disposed along a central axis extending in an axial direction;   a pump part located on one side of the motor part in the axial direction and driven by the motor part via the shaft to discharge oil; and   a control part which controls an operation of the motor part,   wherein the motor part includes a rotor fixed to the other side of the shaft in the axial direction, a stator disposed to face the rotor, and a motor housing having a cylindrical portion which accommodates the rotor and the stator,   the pump part includes a pump rotor mounted on the shaft which protrudes from the motor part to one side in the axial direction and a pump housing having an accommodating portion which accommodates the pump rotor,   the control part includes a plurality of electronic components and a substrate having a surface on which the plurality of electronic components are mounted,   the surface of the substrate is disposed radially outward from the cylindrical portion of the motor housing to face the motor housing and extends in the axial direction,   the stator has a coil,   the coil and the substrate are electrically connected via a connecting bus bar assembly, and   the connecting bus bar assembly is disposed between the cylindrical portion of the motor part and the substrate.   
     
     
         2 . The electric oil pump according to  claim 1 , wherein:
 the motor housing has a case which extends from an outer surface of the cylindrical portion in a direction orthogonal to the axial direction,   the case has a hole portion which extends between the other side of the cylindrical portion in the axial direction and the substrate, and   the connecting bus bar assembly passes through the hole portion.   
     
     
         3 . The electric oil pump according to  claim 2 , wherein:
 the connecting bus bar assembly includes a connecting bus bar connected to the coil, and a connecting assembly main body portion in which the connecting bus bar is disposed, and   the connecting bus bar and the connecting assembly main body portion are an integrally molded product formed of a resin.   
     
     
         4 . The electric oil pump according to  claim 3 , wherein the connecting bus bar assembly extends from the coil toward the substrate in a direction orthogonal to the central axis of the shaft. 
     
     
         5 . The electric oil pump according to  claim 3 , wherein:
 a substrate-side terminal portion of the connecting bus bar is connected to an end of the substrate on the other side in the axial direction, and   a circuit is disposed on one side of the substrate in the axial direction.   
     
     
         6 . The electric oil pump according to  claim 3 , wherein a motor-side terminal portion connected to the coil of the motor part of the connecting bus bar and a substrate-side terminal portion of the connecting bus bar are disposed at different positions in the axial direction. 
     
     
         7 . The electric oil pump according to  claim 6 , wherein:
 the motor part has a motor-side connection terminal which connects the coil on the other side in the axial direction, and   the motor-side terminal portion of the connecting bus bar is in contact with the motor-side connection terminal, and a bolt passes therethrough and is connected thereto.   
     
     
         8 . The electric oil pump according to  claim 6 , wherein:
 a through hole portion connected to the connecting bus bar is provided on the other side of the substrate in the axial direction, and   the substrate-side terminal portion of the connecting bus bar passes through the through hole portion and is connected to the substrate.   
     
     
         9 . The electric oil pump according to  claim 8 , wherein:
 the substrate-side terminal portion of the connecting bus bar has a bent portion which is bent in a direction intersecting a direction in which the connecting bus bar extends from the motor-side terminal portion toward the substrate,   the substrate-side terminal portion is connected to a substrate-side end of the bent portion, and   the substrate-side terminal portion passes through the through hole portion of the substrate and is connected to the substrate via a solder.   
     
     
         10 . The electric oil pump according to  claim 8 , wherein:
 the motor part and the substrate are electrically connected via a plurality of connecting bus bars,   a plurality of through hole portions which connect the respective substrate-side terminal portions of the plurality of connecting bus bars are provided on the other side of the substrate in the axial direction, and   the plurality of through hole portions are disposed linearly.   
     
     
         11 . The electric oil pump according to  claim 3 , wherein:
 the case has a substrate accommodating portion which is located radially outside of the cylindrical portion and extends in the axial direction to accommodate the substrate,   the substrate accommodating portion has a placing surface portion which faces the cylindrical portion and on which the substrate is placed,   the hole portion is open in the placing surface portion, and   a substrate-side end of the connecting assembly main body portion of the connecting bus bar assembly passes through the hole portion and is connected to the substrate.   
     
     
         12 . The electric oil pump according to  claim 1 , wherein the substrate has an axial length shorter than an axial length of an assembly formed by combining the motor part and the pump part and is disposed within an axial range of the assembly.