Electric oil pump

Abstract

An electric oil pump includes a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly and an electric control board, the pump housing defining a pump cavity including first cavity and second cavities, the pump rotor assembly arranged in the first cavity, and the stator assembly, the motor rotor assembly and the electric control board arranged in the second cavity. The pump housing includes a first housing having a side wall with inner and outer surfaces, at least a part of the inner surface is in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, at least a part of the first heat dissipating portion covers at least a part of an outer circumference of the stator assembly in a circumferential direction of the electric oil pump.

1 . An electric oil pump, comprising a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly and an electric control board, the pump housing defining a pump cavity, the pump cavity comprising a first cavity and a second cavity, the pump rotor assembly being arranged in the first cavity, and the stator assembly, the motor rotor assembly and the electric control board being arranged in the second cavity,
 wherein the pump housing comprises a first housing, the first housing comprises a side wall, the side wall comprises an inner surface and an outer surface, at least a part of the inner surface is arranged in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, at least a part of the first heat dissipating portion covers at least a part of an outer circumference of the stator assembly in a circumferential direction of the electric oil pump.   
     
     
         2 . An electric oil pump, comprising a pump housing, a pump rotor assembly, a stator assembly, a motor rotor assembly and an electric control board, the pump housing defining a pump cavity, the pump cavity comprising a first cavity and a second cavity, the pump rotor assembly being arranged in the first cavity, and the stator assembly, the motor rotor assembly and the electric control board being arranged in the second cavity,
 wherein the pump housing comprises a first housing, the first housing comprises a side wall, the side wall comprises an inner surface and an outer surface, at least a part of the inner surface is arranged in contact with at least a part of an outer wall of the stator assembly, the outer surface is provided with or shaped with a first heat dissipating portion, the first housing comprises a hollow portion, a hollow cavity is formed in the hollow portion, the stator assembly and the motor rotor assembly are arranged in the hollow cavity, the stator assembly comprises a coil, the coil comprises a first top and a first bottom, the first top is closer to the pump rotor assembly than the first bottom, the first heat dissipating portion comprises a start portion and an end portion along a central axis direction of the electric oil pump, the start portion is closer to the pump rotor assembly than the end portion, and the first top is closer to the pump rotor assembly than the end portion of the first heat dissipating portion along the central axis direction of the electric oil pump.   
     
     
         3 . The electric oil pump according to  claim 1 , wherein:
 the first heat dissipating portion comprises a start portion and an end portion along an axial direction of the first housing, and the start portion is closer to the pump rotor assembly than the end portion; and   the stator assembly comprises a stator core, along the axial direction of the first housing, the start portion of the first heat dissipating portion is located above the stator core and the end portion of the first heat dissipating portion is located below two thirds of the stator core in the context that a side of the stator core closer to the pump rotor assembly is defined as an upper side and a side of the stator core closer to the electric control board is defined as a lower side.   
     
     
         4 . The electric oil pump according to  claim 1 , wherein: an area of a projection of the first heat dissipating portion onto the outer surface of the side wall is a first area, a surface area of the first heat dissipating portion is a second area, and the second area is larger than or equal to the first area. 
     
     
         5 . The electric oil pump according to  claim 4 , wherein the first heat dissipating portion comprises a plurality of convex portions, the plurality of convex portions are arranged protruding away from the outer surface, and the plurality of convex portions are continuously distributed or spaced apart along an axial direction of the electric oil pump. 
     
     
         6 . The electric oil pump according to  claim 4 , wherein the first heat dissipating portion comprises a plurality of concave portions, the plurality of concave portions are concaved from the outer surface toward a central axis of the first housing, and the plurality of concave portions are continuously distributed or spaced apart along an axial direction of the first housing. 
     
     
         7 . The electric oil pump according to  claim 4 , wherein the first heat dissipating portion comprises a plurality of convex portions, the plurality of convex portions are arranged protruding away from the outer surface, the first heat dissipating portion further comprises a plurality of concave portions, the plurality of concave portions are concaved from the outer surface toward a central axis of the first housing, and the plurality of convex portions and the plurality of concave portions are distributed along an axial direction of the first housing. 
     
     
         8 . The electric oil pump according to  claim 5 , wherein the plurality of convex portions have a same convex height, and a wall thickness of the first housing at the convex portion is larger than or equal to 1.5 times a convex height of the convex portion. 
     
     
         9 . The electric oil pump according to  claim 6 , wherein a wall thickness of the first housing at the concave portion of the first heat dissipating portion is larger than or equal to 0.5 times a concave depth of the concave portion, and the plurality of concave portions have a same concave depth. 
     
     
         10 . (canceled) 
     
     
         11 . The electric oil pump according to  claim 1 , wherein:
 the first housing is made of a metal material and further comprises a first groove and a second groove, and the first heat dissipating portion is located between the first groove and the second groove; and   the electric oil pump further comprises a first annular seal ring and a second annular seal ring, the first annular seal ring is sleeved on the first groove, the second annular seal ring is sleeved on the second groove, and the first heat dissipating portion is located between the first annular seal ring and the second annular seal ring.   
     
     
         12 . The electric oil pump according to  claim 1 , further comprising a second housing, wherein the second housing is fixedly connected to the first housing and comprises a plurality of convex ribs, and the plurality of convex ribs are integrally formed with the second housing by injection molding and are arranged protruding away from the first housing. 
     
     
         13 . (canceled) 
     
     
         14 . The electric oil pump according to  claim 2 , wherein:
 the first heat dissipating portion comprises a start portion and an end portion along an axial direction of the first housing, and the start portion is closer to the pump rotor assembly than the end portion; and   the stator assembly comprises a stator core, wherein along the axial direction of the first housing, the start portion of the first heat dissipating portion is located above the stator core and the end portion of the first heat dissipating portion is located below two thirds of the stator core in the context that a side of the stator core closer to the pump rotor assembly is defined as an upper side and a side of the stator core closer to the electric control board is defined as a lower side.   
     
     
         15 . The electric oil pump according to  claim 2 , wherein an area of a projection of the first heat dissipating portion onto the outer surface of the side wall is a first area, a surface area of the first heat dissipating portion is a second area, and the second area is larger than or equal to the first area. 
     
     
         16 . The electric oil pump according to  claim 15 , wherein the first heat dissipating portion comprises a plurality of convex portions, the plurality of convex portions are arranged protruding away from the outer surface, and the plurality of convex portions are continuously distributed or spaced apart along an axial direction of the electric oil pump. 
     
     
         17 . The electric oil pump according to  claim 15 , wherein the first heat dissipating portion comprises a plurality of concave portions, the plurality of concave portions are concaved from the outer surface toward a central axis of the first housing, and the plurality of concave portions are continuously distributed or spaced apart along an axial direction of the first housing. 
     
     
         18 . The electric oil pump according to  claim 15 , wherein the first heat dissipating portion comprises a plurality of convex portions, the plurality of convex portions are arranged protruding away from the outer surface, the first heat dissipating portion further comprises a plurality of concave portions, the plurality of concave portions are concaved from the outer surface toward a central axis of the first housing, and the plurality of convex portions and the plurality of concave portions are distributed along an axial direction of the first housing. 
     
     
         19 . The electric oil pump according to  claim 16 , wherein the plurality of convex portions have a same convex height, and a wall thickness of the first housing at the convex portion is larger than or equal to 1.5 times a convex height of the convex portion. 
     
     
         20 . The electric oil pump according to  claim 17 , wherein a wall thickness of the first housing at the concave portion of the first heat dissipating portion is larger than or equal to 0.5 times a concave depth of the concave portion, and the plurality of concave portions have a same concave depth. 
     
     
         21 . The electric oil pump according to  claim 2 , wherein:
 the first housing is made of a metal material and further comprises a first groove and a second groove, and the first heat dissipating portion is located between the first groove and the second groove; and   the electric oil pump further comprises a first annular seal ring and a second annular seal ring, the first annular seal ring is sleeved on the first groove, the second annular seal ring is sleeved on the second groove, and the first heat dissipating portion is located between the first annular seal ring and the second annular seal ring.   
     
     
         22 . The electric oil pump according to  claim 2 , further comprising a second housing, wherein the second housing is fixedly connected to the first housing and comprises a plurality of convex ribs, and the plurality of convex ribs are integrally formed with the second housing by injection molding and are arranged protruding away from the first housing.