阅读说明：本技术 转子组件、电机及新能源汽车 (Rotor subassembly, motor and new energy automobile ) 是由 华磊 刘平 陈兴 刘志贤 于 2019-10-12 设计创作，主要内容包括：本发明涉及一种转子组件、电机及新能源汽车。转子组件包括电机轴、套筒及转子。电机轴呈中空结构,具有进液腔。电机轴的端部开设有进液口,电机轴的外壁开设有溢流孔。套筒为两端开口的中空结构,套筒套设并固定于电机轴,并在套筒与电机轴的外壁之间形成导流腔。套筒的外壁开设有导流槽及位于导流槽内并与导流腔连通的出液孔。导流腔及导流槽沿套筒的轴向延伸至套筒的端部,溢流孔与导流腔连通。转子套设并固定于套筒上。本发明提供的转子组件、电机及新能源汽车内的转子可进行有效的散热,具有较佳的散热效果。(The invention relates to a rotor assembly, a motor and a new energy automobile. The rotor subassembly includes motor shaft, sleeve and rotor. The motor shaft is of a hollow structure and is provided with a liquid inlet cavity. The inlet has been seted up to the tip of motor shaft, and the overflow hole has been seted up to the outer wall of motor shaft. The sleeve is a hollow structure with openings at two ends, the sleeve is sleeved and fixed on the motor shaft, and a flow guide cavity is formed between the sleeve and the outer wall of the motor shaft. The outer wall of the sleeve is provided with a diversion trench and a liquid outlet hole which is positioned in the diversion trench and communicated with the diversion cavity. The guide cavity and the guide groove extend to the end part of the sleeve along the axial direction of the sleeve, and the overflow hole is communicated with the guide cavity. The rotor is sleeved and fixed on the sleeve. The rotor assembly, the motor and the rotor in the new energy automobile can effectively dissipate heat, and have a good heat dissipation effect.)

1. A rotor assembly, comprising:

the motor shaft is of a hollow structure and is provided with a liquid inlet cavity, a liquid inlet is formed in the end part of the motor shaft, and an overflow hole is formed in the outer wall of the motor shaft;

the sleeve is of a hollow structure with openings at two ends, the sleeve is sleeved and fixed on the motor shaft, a flow guide cavity is formed between the sleeve and the outer wall of the motor shaft, the outer wall of the sleeve is provided with a flow guide groove and a liquid outlet hole which is positioned in the flow guide groove and communicated with the flow guide cavity, the flow guide cavity and the flow guide groove extend to the end part of the sleeve along the axial direction of the sleeve, and the overflow hole is communicated with the flow guide cavity; and

and the rotor is sleeved and fixed on the sleeve.

2. The rotor assembly of claim 1, wherein the wall of the sleeve is a single-layer structure, and the inner wall of the sleeve and the outer wall of the motor shaft are surrounded to form the flow guiding cavity.

3. The rotor assembly of claim 1 wherein the sleeve comprises an inner layer, an outer layer and ribs, the outer layer and the inner layer are spaced apart to form the flow guide cavity, the ribs are received in the flow guide cavity and are configured to support the inner layer and the outer layer, the inner layer defines flow holes that communicate the flow guide cavity with the overflow holes, and the outer layer defines liquid outlet holes.

4. The rotor assembly of claim 3 wherein the exit aperture, the through-flow aperture and the overflow aperture are aligned.

5. The rotor assembly of claim 1, further comprising a stop member mounted to the motor shaft and abutting an end of the sleeve, the stop member being recessed toward a surface of the sleeve to form a flow guide slot in communication with the flow guide cavity.

6. The rotor assembly of claim 1 further comprising an annular end cap, said end cap being sleeved and secured to said sleeve and abutting an end of said rotor.

7. The rotor assembly of claim 6 wherein the inner surface of the end cap is raised to form a protrusion that is captured within the flow guide slot.

8. The rotor assembly of claim 6 wherein the outer wall of the sleeve protrudes to form a convex hull, the convex hull is spaced apart from the end of the rotor to form a limiting portion, and the end cap is limited by the limiting portion.

9. An electric machine, comprising:

a housing;

a stator mounted within the housing; and

a rotor assembly as claimed in any one of claims 1 to 8, mounted within the housing, the rotor assembly being arranged concentrically with the stator.

10. A new energy automobile, characterized by comprising the motor according to claim 9.

Technical Field

The invention relates to the technical field of new energy automobiles, in particular to a rotor assembly, a motor and a new energy automobile.

Background

A rotor is arranged in a motor of the new energy automobile. The rotor can constantly produce heat energy at the in-process of operation to pile up in the inside of motor, lead to the inside temperature rise of motor, the insulating nature reduces, and the work efficiency of motor descends.

Disclosure of Invention

Accordingly, it is necessary to provide a rotor assembly, a motor, and a new energy vehicle capable of effectively dissipating heat from a rotor in order to solve the problem of heat accumulation inside the motor.

A rotor assembly, comprising:

the motor shaft is of a hollow structure and is provided with a liquid inlet cavity, a liquid inlet is formed in the end part of the motor shaft, and an overflow hole is formed in the outer wall of the motor shaft;

the sleeve is of a hollow structure with openings at two ends, the sleeve is sleeved and fixed on the motor shaft, a flow guide cavity is formed between the sleeve and the outer wall of the motor shaft, the outer wall of the sleeve is provided with a flow guide groove and a liquid outlet hole which is positioned in the flow guide groove and communicated with the flow guide cavity, the flow guide cavity and the flow guide groove extend to the end part of the sleeve along the axial direction of the sleeve, and the overflow hole is communicated with the flow guide cavity; and

and the rotor is sleeved and fixed on the sleeve.

In one embodiment, the wall of the sleeve is a single-layer structure, and the inner wall of the sleeve and the outer wall of the motor shaft are surrounded to form the flow guide cavity.

In one embodiment, the sleeve includes an inner layer, an outer layer and a reinforcing rib, the outer layer and the inner layer are spaced to form the diversion cavity, the reinforcing rib is contained in the diversion cavity and used for supporting the inner layer and the outer layer, the inner layer is provided with a through hole communicating the diversion cavity and the overflow hole, and the outer layer is provided with a liquid outlet hole.

In one embodiment, the liquid outlet hole, the through flow hole and the overflow hole are aligned.

In one embodiment, the motor shaft further comprises a stop piece, the stop piece is mounted on the motor shaft and is abutted against the end part of the sleeve, and the stop piece is recessed towards the surface of the sleeve to form a drainage groove communicated with the drainage cavity.

In one embodiment, the rotor further comprises an annular end cover, and the end cover is sleeved and fixed on the sleeve and abuts against the end part of the rotor.

In one embodiment, the inner surface of the end cover protrudes to form a protrusion, and the protrusion is clamped in the diversion groove.

In one embodiment, the outer wall of the sleeve protrudes to form a convex hull, the convex hull and the end of the rotor are arranged at intervals to form a limiting part, and the end cover is limited at the limiting part.

An electric machine comprising:

a housing;

a stator mounted within the housing; and

the rotor assembly is arranged in the shell and is concentrically arranged with the stator.

A new energy automobile comprises the motor.

Above-mentioned rotor subassembly, motor and new energy automobile, the motor during operation, the rotor rotates, can drive sleeve and motor shaft and rotate. And the rotor is sleeved on the sleeve, part of heat on the rotor can be radiated through the surface of the rotor, and the rest part of heat is transferred to the sleeve, so that the temperature of the sleeve is increased. And the cooling liquid is input from the liquid inlet of the motor shaft, and can be thrown out from the overflow hole and enter the flow guide cavity under the action of centrifugal force. Part of the cooling liquid input into the diversion cavity can flow out from the end part of the sleeve under the guidance of the diversion cavity so as to take heat away from the inner part of the sleeve. The rest part of cooling liquid can enter the surface between the rotor and the sleeve through the liquid outlet holes and flow out from the end part of the sleeve under the action of the flow guide grooves so as to take away heat on the sleeve and the rotor from the outside of the sleeve, and the temperature of the sleeve and the rotor is reduced. Therefore, rotor subassembly, motor and the rotor in the new energy automobile can carry out effectual heat dissipation, have the radiating effect of preferred.

Drawings

FIG. 1 is a schematic view of a rotor assembly according to an embodiment of the present invention;

FIG. 2 is an exploded view of the rotor assembly shown in FIG. 1;

FIG. 3 is a schematic view of the structure of the rotor assembly shown in FIG. 1, showing the motor shaft and the stopping member engaged with each other;

fig. 4 is a structural view illustrating the rotor assembly shown in fig. 3 with a sleeve added.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present invention provides a new energy vehicle (not shown). The new energy automobile includes a motor (not shown). The motor can convert the electric energy into mechanical energy to drive the new energy automobile to run on the road surface.

The motor includes a housing (not shown), a stator (not shown), and a rotor assembly 100.

The housing is hollow and can be used to house the stator and rotor assembly 100.

The stator is of a cylindrical structure and is arranged in the shell.

The rotor assembly 100 is mounted within the housing, and the rotor assembly 100 is concentrically disposed with the stator. When the magnetic field generated by the stator of the motor interacts with the magnetic field generated by the rotor assembly 100, the rotor assembly 100 rotates, so that the motor realizes the conversion of electrical energy and mechanical energy. The rotor assembly 100 includes a motor shaft 110, a sleeve 120, and a rotor 130.

Referring to fig. 3, the motor shaft 110 can be used for supporting and fixing. Generally, the motor shaft 110 is made of a material having a relatively high strength, such as stainless steel or alloy steel, so that the motor shaft 110 has a relatively high bearing capacity.

The motor shaft 110 has a hollow structure and an inlet chamber 122. A liquid inlet 111 is formed at the end of the motor shaft 110, and an overflow hole 113 is formed on the outer wall of the motor shaft 110. The liquid inlet 111 and the overflow hole 113 are both communicated with the liquid inlet cavity 122.

Specifically, the liquid inlet 111 may be disposed on an end surface of one end of the motor shaft 110, or may be disposed on end surfaces of two ends of the motor shaft 110, or may be disposed on an outer wall of one end of the motor shaft 110, or on outer walls of two ends. In this embodiment, to reduce the workload of opening the liquid inlet 111, the liquid inlet 111 is disposed only on one end surface of the motor shaft 110.

The new energy automobile is also internally provided with a pump body which is communicated with the liquid inlet 111. When the pump body works, cooling liquid can be input into the liquid inlet cavity 122 from the liquid inlet 111. The outer wall of the motor shaft 110 is provided with an overflow hole 113. When the motor shaft 110 rotates, the cooling liquid in the liquid inlet cavity 122 can be thrown out from the overflow hole 113 under the action of centrifugal force.

Referring to fig. 4, the sleeve 120 is a hollow structure with two open ends. The sleeve 120 is sleeved and fixed on the motor shaft 110, and a flow guiding cavity 121 is formed between the sleeve 120 and the outer wall of the motor shaft 110. The outer wall of the sleeve 120 is provided with a diversion trench 123 and a liquid outlet hole 124 located in the diversion trench 123. The guide cavity 121 and the guide groove 123 both extend to the end of the sleeve 120 along the axial direction of the sleeve 120. The liquid outlet 124 and the overflow hole 113 are communicated with the diversion cavity 121.

Specifically, the diversion cavity 121 may be formed by the sleeve 120 and the motor shaft 110 being enclosed together. Alternatively, the baffle cavity 121 may be formed only on the sleeve 120. In the present embodiment, the sleeve 120 includes an inner layer 125, an outer layer 127, and a rib 126. The outer layer 127 and the inner layer 125 are spaced apart to form the diversion cavity 121. The reinforcing ribs 126 are accommodated in the diversion cavity 121 and are used for supporting the inner layer 125 and the outer layer 127, the inner layer 125 is provided with a through hole (not visible) communicating the diversion cavity 121 and the overflow hole 113, and the outer layer 127 is provided with a liquid outlet 124.

Specifically, the inner layer 125 and the outer layer 127 are open at both ends. The outer layer 127 is disposed on the inner layer 125 and spaced apart from the inner layer 125 to form a flow guiding cavity 121 with an opening between an inner side of the outer layer 127 and an outer side of the inner layer 125. Specifically, the diversion cavity 121 may extend to one end of the sleeve 120 and may also extend to both ends of the sleeve 120. In this embodiment, the diversion cavity 121 extends to the end portions of the two ends of the sleeve 120, and the opening of the diversion cavity 121 is formed by disposing end surfaces of the same end of the inner layer 125 and the outer layer 127 at intervals.

In this embodiment, the inner layer 125 and the outer layer 127 may extend the same length. Alternatively, the extension length of the inner layer 125 may be greater than the extension length of the outer layer 127, and when the outer layer 127 is sleeved on the inner layer 125, the inner layer 125 protrudes from both ends of the outer layer 127. In this embodiment, the length of the inner layer 125 is the same as the length of the outer layer 127, and when the outer layer 127 is sleeved on the inner layer 125, the end surfaces of the same ends of the outer layer 127 and the inner layer 125 are flush, so that the sleeve 120 has better aesthetic property.

When the motor shaft 110 and the sleeve 120 are installed, the inner layer 125 is sleeved on and fixed to the motor shaft 110. The inner diameter of the inner layer 125 is sized to match the outer diameter of the motor shaft 110 such that the inner layer 125 can be clamped to the motor shaft 110 to achieve a secure fit of the entire sleeve 120. The inner layer 125 and the outer layer 127 extend in the axial direction of the motor shaft 110, so that the sleeve 120 and the motor shaft 110 have a large contact area, which can enhance the installation stability of the sleeve 120.

By arranging the inner layer 125 and the outer layer 127, the inner layer 125 and the outer layer 127 are sleeved with each other to form the diversion cavity 121, so that the diversion cavity 121 can be formed simply. Moreover, the inner layer 125 is directly sleeved on the motor shaft 110 to fix the entire sleeve 120, so that the sleeve 120 has a simpler installation method.

The outer layer 127 and the inner layer 125 are fixedly connected through a reinforcing rib 126. The reinforcing rib 126 is supported between the inner side of the outer layer 127 and the outer side of the inner layer 125, and is fixedly connected with the inner layer 125 and the outer layer 127 to fix the inner layer 125 and the outer layer 127.

In this embodiment, the ribs 126 are elongated and extend in the axial direction of the sleeve 120. The reinforcing ribs 126 have a length corresponding to the length of the inner layer 125 and the outer layer 127, and both ends of the reinforcing ribs 126 are flush with both ends of the inner layer 125. By providing the reinforcing ribs 126 extending along the axial direction of the sleeve 120, the reinforcing ribs 126 can fix and connect the inner layer 125 and the outer layer 127 along the axial direction of the sleeve 120, so that the support stability between the inner layer 125 and the outer layer 127 is stronger.

Further, in the present embodiment, the reinforcing rib 126 is plural, and the plural reinforcing ribs 126 are provided at intervals in the circumferential direction of the inner layer 125. Therefore, the reinforcing ribs 126 can also fix the inner layer 125 and the outer layer 127 from the circumferential direction of the inner layer 125 and the outer layer 127, so that the connection stability of the inner layer 125 and the outer layer 127 is stronger.

Any two adjacent reinforcing ribs 126 partition the diversion cavity 121 to form a plurality of diversion cavity units. The number of the diversion cavity units is equal to the number of the reinforcing ribs 126.

The inner layer 125 is provided with a through hole, and the outer layer 127 is provided with a liquid outlet 124. Specifically, the through holes are disposed in a staggered manner with the liquid outlet holes 124 and the overflow holes 113 on the motor shaft 110, or may be aligned with each other. It is only necessary to ensure that the cooling liquid in the liquid inlet cavity 122 can enter the diversion cavity 121 through the overflow hole 113 and the through-flow hole, and enter the diversion trench 123 through the liquid outlet hole 124. In this embodiment, the exit aperture 124, the through-flow aperture and the overflow aperture 113 are aligned. The number of the overflow holes 113, the through holes, the liquid outlet holes 124 and the diversion trenches 123 is the same as that of the diversion cavity units, and corresponds to one another.

It should be noted that, in other embodiments, the structure of the sleeve 120 is not limited to the above one. In another embodiment, the wall of the sleeve 120 is a single layer. The inner wall of the sleeve 120 and the outer wall of the motor shaft 110 are surrounded to form a flow guide cavity 121.

The sleeve 120 may be fixed to the motor shaft 110 by a fixing ring and a reinforcing rib 126. Specifically, the fixing ring is sleeved and fixed on the motor shaft 110, and the plurality of reinforcing ribs 126 are arranged at intervals along the circumferential direction of the fixing ring. Opposite ends of the reinforcing rib 126 are connected to the fixing ring and the reinforcing rib 126, respectively. A diversion cavity 121 is defined between the outer wall of the motor shaft 110 and the inner wall of the sleeve 120. When the rotor assembly 100 is in operation, the motor shaft 110 and the sleeve 120 rotate, and under the action of centrifugal force, the cooling liquid in the liquid inlet cavity 122 can be thrown out from the overflow holes 113 and enter the diversion cavity 121 through the through holes. Furthermore, the coolant in the diversion cavity 121 can also flow into the diversion trench 123 from the liquid outlet 124 under the action of centrifugal force.

In the new energy automobile, the pump body is also communicated with openings at two ends of the diversion cavity 121 and the diversion trench 123. Under the driving of the pump body, the coolant thrown into the diversion cavity 121 can flow out from openings at two ends of the diversion cavity 121 along the extending direction of the diversion cavity 121. Thus, heat inside the sleeve 120 can be carried out. The cooling liquid entering the guiding groove 123 from the liquid outlet 124 can also flow out from the openings at the two ends of the guiding groove 123 under the driving of the pump body, so as to take away the heat on the surface of the sleeve 120 from the outside. By radiating the sleeve 120 from the inside and the outside at the same time, the temperature of the sleeve 120 can be rapidly lowered, and the sleeve 120 can be cooled.

In the present embodiment, since the liquid outlet hole 124, the through hole and the overflow hole 113 are aligned, a portion of the cooling liquid thrown from the liquid inlet cavity 122 to the liquid outlet hole 124 can be directly thrown into the guiding groove 123 through the overflow hole 113, the through hole and the liquid outlet hole 124. Therefore, the sleeve 120 can dissipate heat from the inside and the outside almost simultaneously, so as to improve heat dissipation efficiency.

The diversion cavity 121 and the diversion trench 123 both extend to the end parts of the two ends of the sleeve 120, and the cooling liquid can be extracted from the two ends of the diversion cavity 121 and the diversion trench 123 to accelerate the circulation of the cooling liquid, so that the heat dissipation speed is higher, the heat dissipation efficiency is higher, and the heat dissipation effect is better.

The plurality of flow guide cavity units, the plurality of overflow holes 113, the plurality of through holes, the plurality of liquid outlet holes 124 and the plurality of flow guide grooves 123 are arranged, so that the flow of the cooling liquid into the flow guide cavities 121 and the flow guide grooves 123 can be accelerated, and the cooling liquid can be rapidly led out from the inside and the outside of the sleeve 120, thereby having higher heat dissipation speed and heat dissipation efficiency.

The rotor 130 has a hollow structure with both ends open. The rotor 130 is sleeved and fixed on the sleeve 120. Specifically, the rotor 130 is fixed to the sleeve 120 by means of a clamping. The length of the rotor 130 is smaller than that of the sleeve 120, and the sleeve 120 protrudes from opposite ends of the rotor 130.

The rotor 130 rotates under the interaction of the magnetic field generated by the stator and the magnetic field generated by the rotor 130, and the rotating rotor 130 drives the sleeve 120 and the motor shaft 110 to rotate so that the motor outputs mechanical energy.

However, the rotor 130 generates heat during rotation. Generally, the rotor 130, the sleeve 120, and the motor shaft 110 are made of metal materials. And the inner surface of the rotor 130 is in contact with the sleeve 120, a part of the heat on the rotor 130 will be transferred to the sleeve 120 to raise the temperature of the sleeve 120.

By providing the guiding cavities 121 and the guiding grooves 123, the sleeve 120 can be cooled from the inside and the outside of the sleeve 120, so as to reduce the temperature of the sleeve 120, and the temperature of the rotor 130 is also reduced by the heat transfer. On the other hand, the guide groove 123 is located between the outer wall of the sleeve 120 and the inner surface of the rotor 130, and the notch of the guide groove 123 faces the inner surface of the rotor 130. Under the action of centrifugal force, the cooling liquid in the guiding groove 123 will also be thrown against the inner surface of the rotor 130 and contact with the inner surface to carry part of the heat of the rotor 130. Further, under the action of the pump body, the cooling liquid may flow out from the guiding groove 123 after contacting the inner surface of the rotor 130, so as to further cool the rotor 130, and the heat dissipation effect of the rotor 130 is better.

In the present embodiment, the rotor assembly 100 further includes an abutment 140. The stopper 140 is mounted on the motor shaft 110 and abuts against the end of the sleeve 120, and the stopper 140 is recessed toward the surface of the sleeve 120 to form a drainage groove 141 communicating with the drainage cavity 121. One end of the drainage groove 141 is communicated with the opening of the drainage cavity 121, and the other end extends to the edge of the stopper 140.

Specifically, two abutting pieces 140 are provided, and the two abutting pieces 140 are respectively disposed at two opposite ends of the sleeve 120 and abut against end surfaces of two ends of the sleeve 120. Each stopper 140 may cover an opening of the diversion cavity 121 at an end corresponding to the stopper 140, so that the coolant in the diversion cavity 121 can only be led out from the diversion trench 123. The inner diameter of the drainage groove 141 is smaller than the opening caliber of the drainage cavity 121. For the pump body is communicated with the larger opening of the diversion cavity 121 and communicated with the diversion cavity 121, the speed of extracting the cooling liquid from the diversion cavity 121 is too fast, which causes too short retention time of the cooling liquid in the diversion cavity 121 and poor heat dissipation effect. And through setting up drainage groove 141, the opening that the one end of drainage groove 141 extended to the edge of keeping off piece 140 is connected with the pump body, and the internal diameter of drainage groove 141 is less, and then the coolant liquid flow that enters into the pump body through drainage groove 141 is also less. Therefore, the staying time of the cooling fluid in the diversion cavity 121 can be properly prolonged, so that the cooling fluid can carry more heat to achieve a better heat dissipation effect. In addition, the smaller inner diameter of drainage groove 141 also facilitates the communication of the pump body with drainage groove 141.

Specifically, the drainage groove 141 may be a plurality of grooves, and the plurality of drainage grooves 141 are arranged at intervals in the circumferential direction of the stopper 140. The plurality of drainage grooves 141 may circumferentially extract the coolant in the drainage cavity 121 from the sleeve 120 to achieve uniform heat dissipation of the sleeve 120.

When the number of the reinforcing ribs 126 is multiple, so that the diversion cavity 121 is partitioned into multiple diversion cavity units, the number of the diversion grooves 141 is the same as the number of the diversion cavity units and corresponds to one another. One end of the diversion trench 123 is communicated with the opening of the diversion cavity unit, and the other end extends to the edge of the stopper 140.

Therefore, the disposition of the stop member 140 can achieve uniform heat dissipation of the sleeve 120, so that the rotor assembly 100 has better heat dissipation effect.

The middle of the stopper 140 is provided with a mounting hole, and the motor shaft 110 penetrates through the mounting hole and is fixed to the mounting hole in a clamping manner. Therefore, by providing the stoppers 140 at both ends of the sleeve 120, the stoppers 140 can also limit the sleeve 120 in the axial direction of the motor shaft 110 to prevent the sleeve 120 from sliding in the axial direction of the motor shaft 110. Thus, the retaining members 140 may also enhance the security of the sleeve 120 installation.

Specifically, the blocking member 140 may be an annular structure, or the blocking member 140 may also be another structure with a mounting hole in the middle. In the embodiment, the blocking member 140 includes a blocking ring 142 and a fixing ring 143, and the fixing ring 143 is disposed at one end of the blocking ring 142 and connected to the blocking ring 142. The fixing ring 143 is fixed to the motor shaft 110, and an end surface of the stopper 142 opposite to the fixing ring 143 abuts against an end of the sleeve 120.

Specifically, the fixing rings 143 and the retaining rings 142 are connected to form mounting holes, and the retaining rings 142 and 143 are clamped to the motor shaft 110. The outer diameter of the fixing ring 143 is smaller than the outer diameter of the stopper ring 142. Drainage groove 141 is provided on retaining ring 142, and the one end of drainage groove 141 extends to the junction of fixed ring 143 and retaining ring 142, and the other end of drainage groove 141 extends to the outward edge of retaining ring 142.

By providing the fixing ring 143 and the blocking ring 142, the contact area between the blocking member 140 and the motor shaft 110 can be made larger than that of the blocking member 140 formed by the single blocking ring 142, so as to improve the installation stability of the blocking member 140.

Meanwhile, the fixing ring 143 is clamped with the motor shaft 110, and the baffle ring 142 can be positioned, so that the baffle ring 142 can be abutted against the end face of the sleeve 120 under the limit of the fixing ring 143, and the tightness of the contact between the baffle ring 142 and the end face of the sleeve 120 is improved, so that the cooling liquid is prevented from overflowing into the motor from the gap between the baffle ring 142 and the end face of the sleeve 120.

Specifically, the retainer ring 142 and the fixing ring 143 may be integrally formed by molding, or may be separately formed and connected by welding or the like.

In the present embodiment, the rotor assembly 100 further includes an annular end cap 150. The end cap 150 is sleeved and fixed on the sleeve 120 and abuts against an end of the rotor 130.

Specifically, a through hole is formed in the middle of the end cover 150, and the sleeve 120 is inserted through the through hole of the end cover 150 and is clamped with the end cover 150.

The two end covers 150 are spaced apart from each other to form a clamping portion, and the rotor 130 can be clamped between the two end covers 150 and limited by the two end covers 150, so as to prevent the rotor 130 from sliding along the axial direction of the sleeve 120 to cause motor failure. Thus, the end cap 150 provides a more stable and accurate mounting and positioning of the sleeve 120.

Further, in the present embodiment, the inner surface of the end cap 150 protrudes to form a protrusion 151, and the protrusion 151 is retained in the guiding groove 123.

Specifically, when the protrusion 151 is clamped in the guiding groove 123, it is required to ensure that the protrusion 151 is not in contact with the bottom of the guiding groove 123, so as to form a gap between the protrusion 151 and the guiding groove 123, and facilitate the flow of the cooling liquid in the guiding groove 123.

The protrusion 151 is clamped in the guiding groove 123, so that the reliability of installation between the end cover 150 and the sleeve 120 can be enhanced, the end cover 150 is prevented from sliding relative to the sleeve 120, and the installation reliability of the rotor 130 can be further enhanced.

Further, in the present embodiment, the outer wall of the sleeve 120 protrudes to form a convex hull 128, the convex hull 128 and the end of the rotor 130 are disposed at an interval to form a limiting portion, and the end cover 150 is limited at the limiting portion.

Specifically, the convex hull 128 may be disposed at one end of the sleeve 120, or may be disposed at two opposite ends of the sleeve 120 to limit the two end caps 150. When the end cap 150 is engaged with the motor shaft 110, one end surface of the end cap 150 abuts against the rotor 130, and the other end surface abuts against the convex hull 128. The convex hull 128 is configured to limit the position of the rotor 130 and the end cover 150, so as to further prevent the end cover 150 and the rotor 130 from sliding along the axial direction of the sleeve 120, so that the end cover 150 and the rotor 130 have better installation stability.

It should be noted that, in the present embodiment, it is preferable that there are two convex hulls 128, the two convex hulls 128 are spaced apart, and the distance between the two convex hulls 128 is equal to the thickness of the two end covers 150 and the length of the rotor 130, so that the end cover 150 and the rotor 130 can be clamped between the two convex hulls 128.

Above-mentioned rotor subassembly, motor and new energy automobile 100, when the motor worked, rotor 130 rotated, can drive sleeve 120 and motor shaft 110 and rotate. The rotor 130 is sleeved on the sleeve 120, a part of heat on the rotor 130 can be dissipated through the surface of the rotor 130, and the rest of heat is transferred to the sleeve 120, resulting in an increase in temperature of the sleeve 120. The cooling liquid is input from the liquid inlet 111 of the motor shaft 110, and under the action of centrifugal force, the cooling liquid can be thrown out from the overflow hole 113 and enter the flow guide cavity 121. Part of the coolant introduced into the guide cavity 121 may flow out from the end of the sleeve 120 under the guide of the guide cavity 121 to take heat away from the interior of the sleeve 120. The remaining portion of the cooling liquid may enter the surface between the rotor 130 and the sleeve 120 through the liquid outlet holes 124 and flow out from the end of the sleeve 120 under the action of the channels 123 to take away heat from the sleeve 120 and the rotor 130 from the outside of the sleeve 120, so that the temperature of the sleeve 120 and the rotor 130 is reduced. Therefore, the rotor assembly, the motor and the rotor 130 in the new energy vehicle 100 can perform effective heat dissipation, and have a better heat dissipation effect.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.