Electric oil pump

Abstract

An electric oil pump includes a pump housing, a first rotor assembly, a pump shaft, a second rotor assembly, a stator assembly, and a circuit board assembly. The pump housing includes at least a first housing, a second housing, and a third housing. A first cavity is formed between the first housing and the second housing. A second cavity is formed between the second housing and the third housing. The first rotor assembly is accommodated in the first cavity. The second rotor assembly, the stator assembly, and the circuit board assembly are accommodated in the second cavity. The first cavity and the second cavity are isolated by an isolation portion, such that working media provided therein do not communicate with each other.

1 . An electric oil pump, comprising: a pump housing, a first rotor assembly, a pump shaft, a second rotor assembly, a stator assembly and a circuit board assembly, wherein
 the pump housing at least comprises a first housing, a second housing and a third housing, the electric oil pump has a pump inner chamber, the pump inner chamber comprises a first inner chamber and a second inner chamber, a sidewall forming the first inner chamber comprises part of the first housing and part of the second housing, a sidewall forming the second inner chamber comprises part of the third housing, and the third housing is configured to shield the circuit board assembly;   the first rotor assembly is accommodated in the first inner chamber, and the second rotor assembly, the stator assembly and the circuit board assembly are accommodated in the second inner chamber;   the electric oil pump comprises a partition portion, the partition portion is arranged between the first housing and the third housing, and the first inner chamber and the second inner chamber are located on two sides of the partition portion; and   the first inner chamber is isolated from the second inner chamber by the partition portion, or the electric oil pump further comprises a sealing portion, and the first inner chamber is isolated from the second inner chamber by the partition portion and the sealing portion.   
     
     
         2 . The electric oil pump according to  claim 1 , wherein the second housing is detachably connected with the first housing, the second housing is closer to the second rotor assembly than the first housing, the second housing comprises the partition portion, and the partition portion is configured to support the first rotor assembly. 
     
     
         3 . The electric oil pump according to  claim 1 , wherein the second housing is detachably connected with the first housing, the second housing is closer to the second rotor assembly than the first housing, the partition portion is detachably connected with the first housing and the second housing, the partition portion is configured to support the first rotor assembly, and the partition portion is closer to the second rotor assembly than the second housing. 
     
     
         4 . The electric oil pump according to  claim 1 , further comprising a fourth housing, wherein the fourth housing is detachably connected with the second housing, the fourth housing is detachably connected with the third housing, the fourth housing comprises the partition portion, and the partition portion is configured to support the first rotor assembly. 
     
     
         5 . The electric oil pump according to  claim 1 , wherein the partition portion comprises a first support portion, the first support portion is arranged protruding from a main body portion of the partition portion toward the second inner chamber, and the pump shaft is directly or indirectly supported on the first support portion. 
     
     
         6 . The electric oil pump according to  claim 5 , wherein
 the first support portion comprises a first accommodating portion, the first accommodating portion is formed with at least part of a first accommodating cavity, the first accommodating cavity is surrounded by at least part of an inner circumferential surface of the first accommodating portion, and   the pump shaft passes through the first accommodating cavity, and at least part of an outer circumferential surface of the pump shaft is in a clearance fit with the inner circumferential surface of the first accommodating portion; or the electric oil pump comprises a first bearing, the first bearing is provided in the first accommodating cavity, the pump shaft passes through the first bearing, and an outer circumferential surface of the first bearing is in an interference fit with the inner circumferential surface of the first accommodating portion.   
     
     
         7 . The electric oil pump according to  claim 6 , wherein the first support portion comprises a second accommodating portion, the second accommodating portion is formed with at least part of a second accommodating cavity, the second accommodating cavity is surrounded by at least part of an inner circumferential surface of the second accommodating portion, the sealing portion comprises an oil seal, the oil seal is provided in the second accommodating cavity, the pump shaft passes through the oil seal, and an outer circumferential surface of the oil seal is sealingly fitted to the second accommodating portion. 
     
     
         8 . The electric oil pump according to  claim 6 , wherein the first support portion comprises a second accommodating portion, at least part of the pump shaft passes through the second accommodating portion; and a clearance is formed between the inner circumferential surface of the second accommodating portion and at least part of the outer circumferential surface of the pump shaft, the clearance is smaller than a penetration distance of a working medium in the first inner chamber, and the clearance is configured to prevent the working medium in the first inner chamber from entering the second inner chamber through the clearance. 
     
     
         9 . The electric oil pump according to  claim 1 , wherein
 the second rotor assembly is arranged between the first rotor assembly and the circuit board assembly; the first rotor assembly is arranged toward to one end of the pump shaft, the second rotor assembly is arranged close to another end of the pump shaft, the circuit board assembly is close to one end of the pump shaft mounted with the second rotor assembly; and   one end of the pump shaft close to the first rotor assembly extends into the first inner chamber, and another end of the pump shaft close to the second rotor assembly extends into the second inner chamber.   
     
     
         10 . The electric oil pump according to  claim 1 , further comprising a partition plate, wherein the partition plate is provided in the second inner chamber, the electric oil pump further comprises a second support portion, the second support portion is integrally formed with the partition plate, the second support portion is arranged protruding from the partition plate toward the second inner chamber, the electric oil pump comprises a second bearing, and the pump shaft is directly supported on the second support portion, or the pump shaft is supported on the second support portion through the second bearing. 
     
     
         11 . The electric oil pump according to  claim 10 , wherein
 the partition plate comprises a third accommodating portion, the third accommodating portion is formed with at least part of a third accommodating cavity, and the third accommodating cavity is surrounded by at least part of an inner circumferential surface of the third accommodating portion, and   the pump shaft passes through the third accommodating cavity, and at least part of the outer circumferential surface of the pump shaft is in a clearance fit with an inner circumferential surface of the third accommodating portion; or the electric oil pump comprises a second bearing, the second bearing is provided in the third accommodating cavity, the pump shaft passes through the second bearing, and an outer circumferential surface of the second bearing is in an interference fit with the inner circumferential surface of the third accommodating portion.   
     
     
         12 . The electric oil pump according to  claim 1 , wherein the first housing is detachably connected with the second housing through a first connection portion, the second housing is detachably connected with the third housing through a second connection portion, and the first connection portion and the second connection portion are not arranged in the first inner chamber or the second inner chamber. 
     
     
         13 . The electric oil pump according to  claim 12 , wherein the first connection portion comprises first screws, the first housing comprises a first flange portion, the first flange portion is arranged protruding from the first housing, the first flange portion is formed with first communication holes, the second housing is formed with first threaded holes, the first threaded holes are formed along a main body portion of the second housing, the first screws pass through the first communication holes and are mounted from a side close to the first housing, and the first screws are screwed to the second housing. 
     
     
         14 . The electric oil pump according to  claim 1 , wherein the electric oil pump comprises an outer sealing portion, the outer sealing portion comprises a first sealing ring and a second sealing ring which are sleeved on an outer circumferential surface of the second housing, the first sealing ring is arranged close to the first housing, and the second sealing ring is arranged close to the third housing. 
     
     
         15 . The electric oil pump according to  claim 14 , wherein
 the first rotor assembly comprises a first rotor and a second rotor, a hydraulic chamber with a variable volume is formed between the first rotor and the second rotor, the electric oil pump further comprises a first flow port and a second flow port, the working medium flows into the electric oil pump through the first flow port, and the working medium flows out of the electric oil pump through the second flow port; and   the electric oil pump further comprises a first communication cavity and a second communication cavity, the first communication cavity is arranged between the first flow port and the hydraulic chamber, the first communication cavity is in communication with the first flow port, the second communication cavity is arranged between the second flow port and the hydraulic chamber, and the second communication cavity is in communication with the second flow port.   
     
     
         16 . The electric oil pump according to  claim 2 , wherein the partition portion comprises a first support portion, the first support portion is arranged protruding from a main body portion of the partition portion toward the second inner chamber, and the pump shaft is directly or indirectly supported on the first support portion. 
     
     
         17 . The electric oil pump according to  claim 3 , wherein the partition portion comprises a first support portion, the first support portion is arranged protruding from a main body portion of the partition portion toward the second inner chamber, and the pump shaft is directly or indirectly supported on the first support portion. 
     
     
         18 . The electric oil pump according to  claim 4 , wherein the partition portion comprises a first support portion, the first support portion is arranged protruding from a main body portion of the partition portion toward the second inner chamber, and the pump shaft is directly or indirectly supported on the first support portion.