CN221354022U

CN221354022U - Rotor support assembly

Info

Publication number: CN221354022U
Application number: CN202322906562.XU
Authority: CN
Inventors: 廖勇; 喻春光; 冯志远
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2023-10-27
Filing date: 2023-10-27
Publication date: 2024-07-16
Anticipated expiration: 2033-10-27

Abstract

The utility model relates to a rotor bracket assembly, which comprises a motor shaft and a rotor bracket, wherein the motor shaft is arranged on the rotor bracket in a penetrating way, a closed oil storage cavity is formed between the rotor bracket and the motor shaft, an oil duct is arranged on the motor shaft and is communicated with the oil storage cavity, an oil hole is arranged on at least one side surface connected with the motor shaft of the rotor bracket, and the oil hole is communicated with the oil storage cavity. The motor rotor is arranged on the excircle of the rotor bracket, and heat generated by the motor rotor in the working process is transmitted to transmission lubricating oil in the oil storage cavity through the rotor bracket and taken away by the transmission lubricating oil, so that the aim of cooling the motor rotor is fulfilled. The transmission lubricating oil in the oil storage cavity is thrown out to the inner wall of the motor stator winding through the oil hole on the rotor support, so that the motor stator can be cooled, and the cooling efficiency of the motor stator is improved. Because the oil storage cavity is formed between the rotor support and the motor shaft, the structure is simple, and the tightness is easy to improve.

Description

Rotor support assembly

Technical Field

The utility model relates to the technical field of automobile hybrid power transmissions, in particular to a rotor bracket assembly.

Background

The motor rotor can generate heat in the working process, and the service life of the motor rotor can be influenced by heat accumulation, so that the motor rotor needs to be cooled by designing a corresponding cooling structure. The Chinese patent application, publication number CN 208433819U, has disclosed the cooling structure of a kind of electric motor rotor, including motor body, stator, rotor core, motor shaft and front and back end caps, there are water-cooling mechanisms in the said motor body, there is a rotor support between motor shaft and the said rotor core; a plurality of through holes are formed in the axial direction of the rotor bracket; a closed cooling oil cavity is formed between the front end part and the rear end part of the stator and the rotor core and the front end cover and the rear end cover, and cooling oil is arranged in the closed cooling oil cavity; during operation, heat generated by the rotor core is transferred to the rotor support, the rotor core rotates to drive cooling oil to splash, so that the cooling oil flows through the through holes in the rotor support, the heat on the rotor support is transferred to the motor shell, and the heat is transferred out through the water cooling mechanism in the motor shell. In the technical scheme, the closed cooling oil cavity is formed by the front end part, the rear end part and the front end cover and the rear end cover of the stator and the rotor iron core, so that the structure for forming the closed cooling oil cavity is complex and has the problem of poor tightness.

Disclosure of utility model

The utility model aims to provide a rotor bracket assembly which solves the problems of complex structure and poor tightness of a closed cooling oil cavity in the prior art.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

The utility model provides a rotor support assembly, includes motor shaft and rotor support, the motor shaft wears to establish on the rotor support, the inside cavity of rotor support, the rotor support with be formed with confined oil storage chamber between the motor shaft, be provided with the oil duct on the motor shaft, the oil duct with the oil storage chamber is linked together, the rotor support with be provided with the oilhole on the at least one side that the motor shaft links to each other, the oilhole with the oil storage chamber is linked together.

According to the technical means, the motor rotor is arranged on the outer circle of the rotor support, heat generated by the motor rotor in the working process is transmitted to the transmission lubricating oil in the oil storage cavity through the rotor support, and the heat is taken away by the transmission lubricating oil, so that the purpose of cooling the motor rotor is achieved. The transmission lubricating oil in the oil storage cavity is thrown out to the inner wall of the motor stator winding through the oil hole on the rotor support, so that the motor stator can be cooled, and the cooling efficiency of the motor stator is improved. Because the oil storage cavity is formed between the rotor support and the motor shaft, the structure is simple, and the tightness is easy to improve.

Further, the rotor bracket is provided with the oil holes on both side surfaces connected with the motor shaft; the oil holes are distributed on two side surfaces of the rotor support in an equal diameter mode.

According to the technical means, as the rotor bracket is provided with the oil holes on the two side surfaces connected with the motor shaft, the transmission lubricating oil can be thrown out to the inner walls of windings at the two ends of the motor stator respectively from the oil holes on the two side surfaces, and the cooling efficiency of the motor stator can be improved. The oil holes are distributed on the two side surfaces of the rotor support in an equal diameter mode, so that oil can be uniformly discharged from the oil holes, and the purpose of uniformly cooling windings at two ends of the stator is achieved.

Further, the oil holes on the two side surfaces are arranged in a staggered manner.

According to the technical means, the oil holes on the two side surfaces are arranged in a staggered mode, so that the oil holes on one side surface cannot overlap with the oil holes on the projected surface when being projected on the other side surface, and the oil outlet balance can be improved.

Further, each oil hole is uniformly arranged on two side surfaces along the circumferential direction, the two side surfaces are a first side surface and a second side surface, the oil hole on the first side surface is a first oil hole, the oil hole on the second side surface is a second oil hole, the number of the first oil holes is the same as that of the second oil holes, and the central angle between the first oil hole projected on the second side surface and the adjacent second oil hole is half of the central angle between the adjacent two first oil holes.

According to the technical means, the central angle between the first oil hole projected on the second side surface and the adjacent second oil hole is half of the central angle between the two adjacent first oil holes, so that the first oil hole of the first side surface and the second oil hole of the second side surface of the rotor bracket can be further ensured to uniformly discharge oil, and the effect of uniformly cooling windings at two ends of the stator is further ensured.

Further, a first step for mounting a rotor of the rotary transformer is arranged on the motor shaft, and the first step is located on one side of the rotor support.

According to the technical means, the rotary transformer rotor is arranged on the motor shaft through the first step, the motor rotor is arranged on the outer circle of the rotor support, and the rotor support is arranged on the motor shaft, so that the motor rotor and the rotary transformer rotor can be integrally arranged on the motor shaft, the structure is compact, and the size of the hybrid transmission can be reduced.

Further, two second steps are further arranged on the motor shaft, one second step is located on one side, away from the rotor support, of the first step, the other second step is located on one side, away from the first step, of the rotor support, a third step is further arranged on the motor shaft, and the third step is located on the side, away from the rotor support, of the second step, away from the first step.

According to the technical means, the bearing is arranged on the second step, the bracket assembly is positioned and supported on the transmission assembly through the bearing on the second step on the motor shaft, and the sealing is completed through the matching of the third step and the oil seal.

Further, the oil duct is axially arranged along the motor shaft, a through hole is formed in the motor shaft, and the through hole is communicated with the oil duct and the oil storage cavity.

According to the technical means, the transmission lubricating oil enters from the oil duct on the motor shaft and enters into the oil storage cavity through the through hole on the motor shaft, heat generated by the motor rotor during operation is transferred to the transmission lubricating oil in the oil storage cavity through the rotor support, and the transmission lubricating oil takes away heat generated by the motor rotor during operation and plays a role in cooling the motor rotor.

Further, the rotor bracket comprises a bracket body and a supporting disc, wherein the bracket body is provided with an open structure, the supporting disc is arranged on the inner wall surface of the open structure, the bracket body and the supporting disc are arranged on the motor shaft, and the oil storage cavity is formed among the bracket body, the supporting disc and the motor shaft; the oil holes are arranged on the side surfaces of the support disc or/and the support body opposite to the support disc.

According to the technical means, the supporting disc is arranged on the inner wall surface of the open structure, the supporting disc needs to be kept sealed with the inner wall surface of the open structure, the support body and the supporting disc are arranged on the motor shaft and kept sealed with the contact surface of the motor shaft, and the oil storage cavity is formed among the support body, the supporting disc and the motor shaft, so that the structure is simpler, and the tightness can be improved. Because the oil hole is arranged on the side surface of the support disc or/and the support body opposite to the support disc, transmission lubricating oil in the oil storage cavity can be thrown out from the oil hole to the inner wall of the motor stator winding, and therefore the motor stator can be cooled.

Further, the support body is formed with the outward flange along radial extension in the outward flange side of open structure, the support body extends along axial direction to be formed with the flange, the edge of supporting disk extends along axial to be formed with the inward flange, the inward flange with open structure's internal wall face links to each other.

According to the technical means, the arrangement of the outward flange and the flange can improve the dynamic balance precision requirement of the rotor bracket after the motor rotor is additionally arranged, and improve the running stability of the motor.

Further, be provided with first shaft hole on the support body, be provided with the second shaft hole on the supporting disk, be provided with first boss and second boss on the motor shaft, first boss is close to one side of second boss is provided with first spacing step, the second boss is close to one side of first boss is provided with the spacing step of second, first boss is installed in the first shaft hole, first spacing step with the support body is connected, the second boss is installed in the second shaft hole, the spacing step of second with the supporting disk is connected.

According to the technical means, the first boss is arranged in the first shaft hole, the first limiting step is connected with the support body, the second boss is arranged in the second shaft hole, and the second limiting step is connected with the support disc, so that the support body and the support disc can be arranged on the motor shaft.

The utility model has the beneficial effects that: in the utility model, the motor rotor is arranged on the outer circle of the rotor bracket, and the heat generated by the motor rotor in the working process is transferred to the transmission lubricating oil in the oil storage cavity through the rotor bracket and is taken away by the transmission lubricating oil, so that the aim of cooling the motor rotor is fulfilled. The transmission lubricating oil in the oil storage cavity is thrown out to the inner wall of the motor stator winding through the oil hole on the rotor support, so that the motor stator can be cooled, and the cooling efficiency of the motor stator is improved. Because the oil storage cavity is formed between the rotor support and the motor shaft, the structure is simple, and the tightness is easy to improve. In addition, because the rotor bracket is hollow, the weight of the motor rotor is reduced, and the power economy of the transmission assembly is improved.

Drawings

FIG. 1 is a schematic view of a rotor support assembly of the present utility model;

FIG. 2 is a structural view of a bracket body of the rotor bracket assembly of the present utility model;

FIG. 3 is a structural view of a support disk in the rotor bracket assembly of the present utility model;

FIG. 4 is a structural view of a motor shaft in the rotor support assembly of the present utility model;

FIG. 5 is a schematic view of a rotor frame assembly according to the present utility model with a first oil hole on a first side projected onto a second side.

Wherein: 1. a motor shaft; 2. a rotor bracket; 3. an oil storage chamber; 4. an oil passage; 5. an oil hole; 51. a first oil hole; 52. a second oil hole; 11. a first step; 12. a second step; 13. a third step; 14. a through hole; 21. a bracket body; 22. a support plate; 211. an open structure; 212. a flanging; 213. a flange; 214. a first shaft hole; 215. an outer circle; 221. an inner flanging; 222. a second shaft hole; 223. a convex ring; 15. a first boss; 16. a second boss; 17. a first limit step; 18. a second limit step; 19. and (3) a spline.

Detailed Description

Further advantages and effects of the present utility model will become readily apparent to those skilled in the art from the disclosure herein, by referring to the accompanying drawings and the preferred embodiments. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be understood that the preferred embodiments are presented by way of illustration only and not by way of limitation.

It should be noted that the illustrations provided in the following embodiments merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.

As shown in fig. 1, a rotor support assembly comprises a motor shaft 1 and a rotor support 2, wherein the motor shaft 1 is arranged on the rotor support 2 in a penetrating manner, the rotor support 2 is hollow, a closed oil storage cavity 3 is formed between the rotor support 2 and the motor shaft 1, an oil duct 4 is arranged on the motor shaft 1, the oil duct 4 is communicated with the oil storage cavity 3, an oil hole 5 is formed in at least one side surface of the rotor support 2 connected with the motor shaft 1, and the oil hole 5 is communicated with the oil storage cavity 3. In this embodiment, the motor rotor is mounted on the outer circle 215 of the rotor support 2, and heat generated by the motor rotor in the working process is transferred to the transmission lubricating oil in the oil storage cavity 3 through the rotor support 2, and is taken away by the transmission lubricating oil, so as to achieve the purpose of cooling the motor rotor. The transmission lubricating oil in the oil storage cavity 3 is thrown out to the inner wall of the motor stator winding through the oil hole 5 on the rotor bracket 2, so that the motor stator can be cooled, and the cooling efficiency of the motor stator is improved. Because the oil storage cavity 3 is formed between the rotor bracket 2 and the motor shaft 1, the structure is simple and the tightness is easy to improve. It should be noted that, the rotor support 2 is provided with a shaft hole, the rotor support 2 is installed on the motor shaft 1 through the shaft hole, the rotor support 1 and the motor shaft 1 can be in interference fit, and then the rotor support 2 and the motor shaft 1 are welded and fixed. The rotor support 2 is arranged on the motor shaft 1, two side surfaces of the rotor support 2 are connected with the motor shaft 1, and an oil hole 5 is arranged on at least one side surface, so that transmission lubricating oil in the oil storage cavity 3 can be thrown out to the inner wall of a motor stator winding. It should also be noted that this embodiment takes advantage of the cooling effect of the transmission oil, but does not exclude the cooling by means of a cooling fluid.

In the present embodiment, as shown in fig. 2 and 3, the rotor frame 2 is provided with oil holes 5 on both side surfaces connected to the motor shaft 1. Because the rotor bracket 2 is provided with the oil holes 5 on the two side surfaces connected with the motor shaft 1, the transmission lubricating oil can be respectively thrown out from the oil holes 5 on the two side surfaces to the inner walls of windings at the two ends of the motor stator, and the efficiency of cooling the motor stator can be improved. The oil holes 5 are distributed on the two side surfaces of the rotor bracket 2 in equal diameter, and as the oil holes 5 are distributed on the two side surfaces of the rotor bracket 2 in equal diameter, the oil can be uniformly discharged from the oil holes 5, thereby achieving the purpose of uniformly cooling windings at the two ends of the stator. The equal diameter means that the distances between the oil holes 5 on both sides and the center of the side where the oil holes 5 are located are the same, that is, the distances between the centers of the oil holes 5 on both sides and the center line of the motor shaft 1 are the same.

In this embodiment, the oil holes 5 on both side surfaces are arranged in a staggered manner. The staggered arrangement of the oil holes 5 on the two side surfaces means that the oil holes 5 on one side surface are not overlapped with the positions of the oil holes 5 on the projected side surface when projected on the other side surface, so that the staggered arrangement of the oil holes 5 on the two side surfaces is realized, and the oil outlet balance can be improved.

In the present embodiment, as shown in fig. 2 and 3, the oil holes 5 are uniformly arranged on two side surfaces in the circumferential direction, the two side surfaces are a first side surface and a second side surface, the oil hole 5 on the first side surface is a first oil hole 51, the oil hole 5 on the second side surface is a second oil hole 52, the number of the first oil holes 51 is the same as the number of the second oil holes 52, and the central angle between the first oil hole 51 projected on the second side surface and the adjacent second oil hole 52 is half of the central angle between the adjacent two first oil holes 51. Because the central angle between the first oil hole 51 projected on the second side surface and the adjacent second oil hole 52 is half of the central angle between the two adjacent first oil holes 51, the arrangement can further ensure that the first oil hole 51 on the first side surface and the second oil hole 52 on the second side surface of the rotor bracket 2 evenly discharge oil, and further ensure the effect of evenly cooling windings at two ends of the stator. In one embodiment, the first side surface is uniformly provided with 6 first oil holes 51 along the circumferential direction, the central angle between two adjacent first oil holes 51 is 60 degrees, the second side surface is also uniformly provided with 6 second oil holes 52 along the circumferential direction, the central angle between two adjacent second oil holes 52 is also 60 degrees, and the central angle between the projection of the first oil hole 51 on the first side surface on the second side surface and the second oil hole 52 adjacent to the first oil hole is 30 degrees. In another embodiment, as shown in fig. 5, the first side surface is uniformly distributed with 4 first oil holes 51 along the circumferential direction, the central angle between two adjacent first oil holes 51 is a, a is 90 °, the second side surface is also uniformly distributed with 4 second oil holes 52 along the circumferential direction, the central angle between two adjacent second oil holes 52 is also 90 °, the central angle between the projection of the first oil hole 51 on the first side surface on the second side surface and the central angle between the second oil hole 52 adjacent thereto is B, and B is 45 °.

In the present embodiment, as shown in fig. 1 and 4, a first step 11 for mounting a rotor of a resolver is provided on a motor shaft 1, and the first step 11 is located on one side of a rotor bracket 2. The rotary transformer rotor is arranged on the motor shaft 1 through the first step 11, the motor rotor is arranged on the outer circle of the rotor support 2, and the rotor support 2 is arranged on the motor shaft 1, so that the motor rotor and the rotary transformer rotor can be integrally arranged on the motor shaft 1, the structure is compact, and the size of the hybrid transmission can be reduced. It should be noted that the resolver rotor and the first step 11 may be connected by interference fit.

In this embodiment, as shown in fig. 1 and 4, two second steps 12 are further disposed on the motor shaft 1, one of the second steps 12 is located on a side of the first step 11 away from the rotor support 2, the other second step 12 is located on a side of the rotor support 2 away from the first step 11, a third step 13 is further disposed on the motor shaft 1, and the third step 13 is located on a side of the second step 12 away from the first step 11 away from the rotor support 2. The bracket assembly is positioned and supported on the transmission assembly by a bearing through a second step 12 on the motor shaft 1, and the sealing is completed through the matching of a third step 13 and an oil seal.

In this embodiment, as shown in fig. 4, the oil passage 4 is disposed along the axial direction of the motor shaft 1, and a through hole 14 is disposed on the motor shaft 1, and the through hole 14 communicates the oil passage 4 with the oil storage chamber 3. The transmission lubricating oil enters from the oil duct 4 on the motor shaft 1 through the oil pump and enters into the oil storage cavity 3 through the through hole 14 on the motor shaft 1, heat generated during the operation of the motor rotor is transferred to the lubricating oil in the oil storage cavity 3 through the rotor bracket 2, and the transmission lubricating oil takes away the heat generated during the operation of the motor rotor, so that the function of cooling the motor rotor is achieved. The transmission lubricating oil thrown from the oil hole 5 to the stator winding flows back into the transmission bottom shell, and is then conveyed to the oil duct 4 through the oil pump for circulation.

In the present embodiment, as shown in fig. 1 to 3, the rotor bracket 2 includes a bracket body 21 and a supporting plate 22, the bracket body 21 has an open structure 211, the supporting plate 22 is mounted on an inner wall surface of the open structure 211, the bracket body 21 and the supporting plate 22 are mounted on the motor shaft 1, and an oil storage chamber 3 is formed among the bracket body 21, the supporting plate 22 and the motor shaft 1. The supporting plate 22 is mounted on the inner wall surface of the open structure 211, the supporting plate 22 needs to be kept sealed with the inner wall surface of the open structure 211, and the supporting plate 22 can be connected with the inner wall surface of the open structure 211 in a welding mode. The bracket body 21 and the supporting disc 22 can be mounted on the motor shaft 1 in an interference fit manner and keep sealing with the contact surface of the motor shaft 1. The oil storage cavity 3 is formed among the bracket body 21, the supporting disc 22 and the motor shaft 1, so that the structure is simpler, and the tightness can be improved. The support plate 22 is formed with the convex ring 223, so that the rigidity of the support plate 22 can be increased. The oil holes 5 are provided on the support plate 22 or/and the side of the bracket body 21 opposite to the support plate 22. Since the oil hole 5 is provided on the side of the support plate 22 or/and the support body 21 opposite to the support plate 22, the transmission lubricating oil in the oil storage chamber 3 can be thrown out from the oil hole 5 to the inner wall of the motor stator winding, thereby cooling the motor stator.

In the present embodiment, as shown in fig. 2 and 3, the bracket body 21 is formed with an outward flange 212 extending in the radial direction on the outer edge side of the open structure 211, the bracket body 21 is formed with a flange 213 extending in the axial direction, and the edge of the support plate 22 is formed with an inward flange 221 extending in the axial direction, and the inward flange 221 is connected to the inner wall surface of the open structure 211. The outward flange 212 and the flange 213 are respectively positioned at two ends of the bracket body 21, the outward flange 212 and the flange 213 can be used for correcting dynamic balance after the motor rotor is additionally arranged, and the arrangement of the outward flange 212 and the flange 213 can improve the dynamic balance precision requirement of the rotor bracket 2 after the motor rotor is additionally arranged, and improve the running stability of the motor. Specifically, in the case of dynamic balance correction, the dynamic balance can be corrected by removing the material of the flange 212 or the flange 213.

In this embodiment, as shown in fig. 2 to 4, a first shaft hole 214 is provided on the bracket body 21, a second shaft hole 222 is provided on the support plate 22, a first boss 15 and a second boss 16 are provided on the motor shaft 1, a first limit step 17 is provided on one side of the first boss 15 near the second boss 16, a second limit step is provided on one side of the second boss 16 near the first boss 15, the first boss 15 is installed in the first shaft hole 214, the first limit step 17 is connected with the bracket body 21, the second boss 16 is installed in the second shaft hole 222, and the second limit step is connected with the support plate 22. The first boss 15 is installed in the first shaft hole 214, the first limiting step 17 is connected with the support body 21, the first boss 15 and the first shaft hole 214 are installed in interference fit, and the first limiting step 17 and the support body 21 can be connected in a welding mode. The second boss 16 is installed in the second shaft hole 222 and the second limiting step is connected with the supporting disc 22, the second boss 16 and the second shaft hole 222 are installed in interference fit, and the second limiting step and the supporting disc 22 can be connected in a welding mode, so that the bracket body 21 and the supporting disc 22 can be firmly installed on the motor shaft 1. The motor shaft 1 is further provided with a spline 19 for power transmission.

The above embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model.

Claims

1. The utility model provides a rotor support assembly, includes motor shaft (1) and rotor support (2), motor shaft (1) wears to establish on rotor support (2), its characterized in that: the novel motor is characterized in that the rotor support (2) is hollow, a closed oil storage cavity (3) is formed between the rotor support (2) and the motor shaft (1), an oil duct (4) is arranged on the motor shaft (1), the oil duct (4) is communicated with the oil storage cavity (3), an oil hole (5) is formed in at least one side surface of the rotor support (2) connected with the motor shaft (1), and the oil hole (5) is communicated with the oil storage cavity (3).

2. The rotor bracket assembly of claim 1, wherein: the rotor support (2) is provided with oil holes (5) on two side surfaces connected with the motor shaft (1), and the oil holes (5) are distributed on the two side surfaces of the rotor support (2) in an equal diameter mode.

3. The rotor bracket assembly of claim 2, wherein: the oil holes (5) on the two side surfaces are arranged in a staggered way.

4. A rotor support assembly as set forth in claim 3 wherein: each oil hole (5) is evenly arranged on two side surfaces along the circumferential direction respectively, the two side surfaces are a first side surface and a second side surface, the oil hole (5) on the first side surface is a first oil hole (51), the oil hole (5) on the second side surface is a second oil hole (52), the number of the first oil holes (51) is the same as the number of the second oil holes (52), and the central angle between the first oil hole (51) projected on the second side surface and the adjacent second oil holes (52) is half of the central angle between the two adjacent first oil holes (51).

5. The rotor bracket assembly of claim 1, wherein: the motor shaft (1) is provided with a first step (11) for mounting a rotor of the rotary transformer, and the first step (11) is positioned on one side of the rotor support (2).

6. The rotor bracket assembly of claim 5, wherein: the motor shaft (1) is further provided with two second steps (12), one second step (12) is located one side, away from the rotor support (2), of the first step (11), the other second step (12) is located one side, away from the first step (11), of the rotor support (2), a third step (13) is further arranged on the motor shaft (1), and the third step (13) is located one side, away from the first step (11), of the second step (12), away from the rotor support (2).

7. The rotor bracket assembly of claim 1, wherein: the oil duct (4) is axially arranged along the motor shaft (1), a through hole (14) is formed in the motor shaft (1), and the through hole (14) is communicated with the oil duct (4) and the oil storage cavity (3).

8. The rotor support assembly of any one of claims 1 to 7, wherein: the rotor support (2) comprises a support body (21) and a support disc (22), wherein the support body (21) is provided with an open structure (211), the support disc (22) is installed on the inner wall surface of the open structure (211), the support body (21) and the support disc (22) are installed on the motor shaft (1), and an oil storage cavity (3) is formed among the support body (21), the support disc (22) and the motor shaft (1); the oil hole (5) is arranged on the side surface of the support disc (22) or/and the support body (21) opposite to the support disc (22).

9. The rotor bracket assembly of claim 8, wherein: the support body (21) is formed with an outward flange (212) along the radial extension of the outer edge side of the open structure (211), the support body (21) is formed with a flange (213) along the axial extension, the edge of the support disc (22) is formed with an inward flange (221) along the axial extension, and the inward flange (221) is connected with the inner wall surface of the open structure (211).

10. The rotor bracket assembly of claim 8, wherein: be provided with first shaft hole (214) on support body (21), be provided with second shaft hole (222) on supporting disk (22), be provided with first boss (15) and second boss (16) on motor shaft (1), one side that first boss (15) is close to second boss (16) is provided with first spacing step (17), one side that second boss (16) is close to first boss (15) is provided with second spacing step (18), first boss (15) are installed in first shaft hole (214), first spacing step (17) with support body (21) are connected, second boss (16) are installed in second shaft hole (222), second spacing step (18) with supporting disk (22) are connected.