CN218678589U

CN218678589U - Rotor structure and oil-cooled motor

Info

Publication number: CN218678589U
Application number: CN202222589375.9U
Authority: CN
Inventors: 何玉林
Original assignee: Chongqing Jinkang Power New Energy Co Ltd
Current assignee: Chongqing Jinkang Power New Energy Co Ltd
Priority date: 2022-09-29
Filing date: 2022-09-29
Publication date: 2023-03-21
Anticipated expiration: 2032-09-29

Abstract

The application relates to a rotor structure and oil-cooled motor, the rotor structure includes: the rotating shaft is provided with a first oil duct and a second oil duct, and the second oil duct is provided with two groups; a rotor core provided on the rotating shaft; the two rotor end plates are arranged on the rotating shaft and are respectively abutted against two ends of the rotor core, oil grooves and oil throwing holes are respectively formed in one sides, close to the rotor core, of the two rotor end plates, the oil grooves of the two rotor end plates are respectively communicated with the two groups of second oil ducts, and the oil throwing holes are obliquely arranged and penetrate through the outer side walls of the rotor end plates; and the cooling oil pipe penetrates through the rotor core along the axial direction, one end of the cooling oil pipe is communicated with the oil groove of one rotor end plate, and the other end of the cooling oil pipe is communicated with the oil throwing hole of the other rotor end plate. The application provides a rotor structure can avoid the cooling oil to get rid of between rotor structure and the stator structure from between rotor core's the towards piece when cooling rotor core, and then in order to reach the purpose that reduces the mechanical loss of motor, reduces the efficiency of motor.

Description

Rotor structure and oil-cooled motor

Technical Field

The application relates to the technical field of motors, in particular to a rotor structure and an oil-cooled motor.

Background

Because oil has the characteristics of insulation and non-magnetic conductivity, the motor in the prior art mostly adopts an internal direct oil cooling mode, namely cooling oil directly circulates in the motor so as to cool a rotor structure, a stator structure, a bearing structure and the like of the motor. The cooling method of the oil-cooled motor for the rotor core comprises the following steps: an oil passage is formed in the rotor core in the axial direction, and cooling oil can pass through the oil passage by arranging the oil passage.

However, the cooling method easily causes the cooling oil to be thrown out from between the rotor sheets of the rotor core and to be thrown to between the rotor structure and the stator structure of the oil-cooled motor, so that the friction resistance between the rotor structure and the stator structure is increased, the mechanical loss of the motor is increased, and the efficiency of the motor is reduced.

SUMMERY OF THE UTILITY MODEL

Based on this, the present application provides a rotor structure and an oil-cooled motor to improve the problem that the rotor structure of the oil-cooled motor in the prior art increases the mechanical loss of the motor and reduces the efficiency of the motor when cooling the rotor core thereof.

In a first aspect, the present application provides a rotor structure comprising:

the oil pump comprises a rotating shaft, a first oil duct and a second oil duct, wherein the first oil duct is arranged along the axial direction of the rotating shaft, the second oil duct is communicated with the first oil duct along the radial direction of the rotating shaft, and the second oil ducts are arranged in two groups along the axial direction of the rotating shaft;

a rotor core provided on the rotating shaft;

the two rotor end plates are arranged on the rotating shaft and are respectively abutted against two ends of the rotor iron core, one sides of the two rotor end plates, which are close to the rotor iron core, are respectively provided with an oil groove and an oil throwing hole, the oil grooves of the two rotor end plates are respectively communicated with the two groups of second oil ducts, and the oil throwing holes are obliquely arranged and penetrate through the outer side wall of the rotor end plate; and

and the cooling oil pipe axially penetrates through the rotor iron core, one end of the cooling oil pipe is communicated with the oil groove of one rotor end plate, and the other end of the cooling oil pipe is communicated with the oil throwing hole of the other rotor end plate.

In one embodiment, an oil collecting counter bore is further formed in one side, close to the rotor core, of the rotor end plate, two ends of the cooling oil pipe respectively extend into the oil collecting counter bores of the two rotor end plates and keep a gap with the bottom walls of the oil collecting counter bores, and the oil groove and the oil throwing hole are respectively communicated with one oil collecting counter bore.

In one embodiment, iron core pressing plates are arranged at two ends of the rotor iron core and between the two rotor end plates, two ends of the cooling oil pipe respectively penetrate through the two iron core pressing plates and are provided with limiting tables which are abutted against one sides of the iron core pressing plates far away from the rotor iron core, and the limiting tables extend into the oil gathering sunken holes.

In one embodiment, the oil groove comprises a plurality of radial grooves arranged at intervals in the circumferential direction and a circumferential groove communicated with the plurality of radial grooves, the oil gathering counter bores are communicated with the radial grooves, the number of the oil throwing holes is equal to that of the radial grooves, and the oil throwing holes and the radial grooves are staggered at intervals in the circumferential direction.

In one embodiment, the annular groove is formed in one side close to the axis of the rotor end plate, the second oil channels are communicated with the annular groove, the number of the second oil channels in each group is two, and the two second oil channels are arranged at equal intervals in the circumferential direction.

In one embodiment, the rotor structure further comprises magnetic steel, the rotor core is provided with a magnetic steel groove along the axial direction, and the magnetic steel is arranged in the magnetic steel groove.

In one embodiment, the magnetic steels are provided with a plurality of pairs at equal intervals along the circumferential direction, each pair of magnetic steels corresponds to each cooling oil pipe one by one, each pair of magnetic steels is arranged in a V shape and comprises a close end and a spread end, the close ends are close to each other, the spread ends are far away from each other, the spread ends of each pair of magnetic steels face the direction far away from the axis of the rotor core, and the cooling oil pipes are arranged between the spread ends of the pair of magnetic steels.

In one embodiment, one side of the rotor end plate close to the axis of the rotor end plate is provided with a first positioning key, one side of the rotating shaft far away from the axis of the rotating shaft is provided with a key groove, and the first positioning key is arranged in the key groove.

In one embodiment, a side of the rotor core near the axis thereof is provided with a second positioning key, which is also provided in the key groove.

In a second aspect, the present application provides an oil-cooled electric machine comprising any one of the rotor structures provided herein.

The application provides a rotor structure cools off rotor core through the coolant oil of circulation in the coolant oil pipe, can avoid the coolant oil to get rid of between rotor structure and the stator structure from between rotor core's the towards piece when cooling rotor core, and then in order to avoid the frictional resistance increase between rotor structure and the stator structure, in order to reach the purpose that reduces the mechanical loss of motor, reduces the efficiency of motor.

Drawings

Fig. 1 is a schematic structural diagram of a rotor structure according to an embodiment of the present disclosure;

FIG. 2 is a radial cross-sectional view of a rotor structure provided in accordance with an embodiment of the present application;

FIG. 3 is an axial cross-sectional view of a rotor structure provided in accordance with an embodiment of the present disclosure;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic structural diagram of a rotating shaft, a rotor end plate and cooling oil pipes of a rotor structure according to an embodiment of the present disclosure;

fig. 6 is an enlarged view of a portion B in fig. 5.

Reference numerals: 1. a rotating shaft; 2. a first oil passage; 3. a second oil passage; 4. a rotor core; 5. a rotor end plate; 6. an oil sump; 7. an oil throwing hole; 8. cooling the oil pipe; 9. rotor punching sheets; 10. a through hole; 11. oil gathering counter bores; 12. an iron core pressing plate; 13. a limiting table; 14. a radial slot; 15. a circumferential groove; 16. magnetic steel; 17. a magnetic steel groove; 18. a first positioning key; 19. a keyway; 20. limiting the shaft neck; 21. a second positioning key.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that the illustration provided in the present embodiment is only to illustrate the basic idea of the present invention in a schematic way.

The structure, proportion, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, and any structural modification, proportion relation change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the efficacy and the achievable purpose of the present invention.

References in this specification to orientations or positional relationships such as "upper," "lower," "left," "right," "middle," "longitudinal," "lateral," "horizontal," "inner," "outer," "radial," "circumferential," and the like are based on the orientations or positional relationships illustrated in the drawings and are intended to simplify the description, rather than to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Example one

The embodiment of the present application provides a rotor structure, and rotor structure includes:

the oil-gas separation device comprises a rotating shaft 1, a first oil duct 2 and second oil ducts 3, wherein the first oil duct 2 is arranged along the axial direction of the rotating shaft 1, the second oil ducts 3 are communicated with the first oil duct 2 along the radial direction of the rotating shaft, and two groups of the second oil ducts 3 are arranged along the axial direction of the rotating shaft 1;

a rotor core 4 provided on the rotating shaft 1;

the two rotor end plates 5 are arranged on the rotating shaft 1 and are respectively abutted against two ends of the rotor core 4, oil grooves 6 and oil throwing holes 7 are respectively formed in one sides, close to the rotor core 4, of the two rotor end plates 5, the oil grooves 6 of the two rotor end plates 5 are respectively communicated with the two groups of second oil ducts 3, and the oil throwing holes 7 are obliquely arranged and penetrate through the outer side walls of the rotor end plates 5; and

and the cooling oil pipe 8 is axially arranged on the rotor core 4 in a penetrating manner, one end of the cooling oil pipe is communicated with the oil groove 6 of one rotor end plate 5, and the other end of the cooling oil pipe is communicated with the oil throwing hole 7 of the other rotor end plate 5.

As shown in fig. 1 and fig. 2, in the present embodiment, it is exemplarily illustrated that the rotor core 4 is formed by press-fitting and fixing a plurality of rotor sheets 9, the rotor sheets 9 are arranged in a ring shape, and the rotor core 4 is provided with a plurality of through holes 10 along a circumferential direction. The formed rotor core 4 is cylindrical and is arranged in a hollow manner, and the through holes 10 of the rotor punching sheets 9 are used for the cooling oil pipes 8 to pass through. The through hole 10 may be provided as a circular hole and the cooling oil pipe 8 may be provided as a circular pipe, and the outer diameter of the cooling oil pipe 8 is equal to the inner diameter of the through hole 10.

The rotating shaft 1 is of a revolving body structure, and the rotor core 4 and the two rotor end plates 5 are sleeved on the rotating shaft 1 and are coaxial with the rotating shaft 1. Rotor core 4 is disposed in the middle of rotating shaft 1, and two rotor end plates 5 are disposed at two ends of rotor core 4. Rotor core 4 and two rotor end plates 5 are all fixed as integral structure with pivot 1 to rotate along with pivot 1 synchronization.

As shown in fig. 3 and 4, the first oil passage 2 and the second oil passage 3 are both provided as circular holes, wherein the first oil passage 2 is provided on the rotating shaft 1 in a non-penetrating manner, and extends from one end of the rotating shaft 1 to a position close to the other end of the rotating shaft 1. The two groups of second oil passages 3 are communicated with the first oil passage 2 along the radial direction and are respectively arranged at the positions close to the two ends of the rotating shaft 1. The oil groove 6 and the oil slinger hole 7 are both arranged on one side of the rotor end plate 5 close to the rotor iron core 4. The oil grooves 6 of the two rotor end plates 5 are respectively communicated with the two groups of second oil channels 3, and the two ends of the cooling oil pipe 8 are respectively communicated with the oil groove 6 of one rotor end plate 5 and the oil throwing hole 7 of the other rotor end plate 5.

As shown in fig. 3 and 4, in the present embodiment, the cooling oil enters from the first oil passage 2 and cools the rotary shaft 1; then the cooling oil is divided into two oil paths to enter the oil grooves 6 of the two rotor end plates 5 through the two groups of second oil passages 3 respectively, and the two rotor end plates 5 are cooled; after that, the two oil paths respectively enter different cooling oil pipes 8 from the oil grooves 6 of the two rotor end plates 5 in opposite directions, and cool the rotor iron core 4; finally, the two oil paths respectively enter oil throwing holes 7 of the two rotor end plates 5 and are thrown to two ends of the stator structure so as to cool the stator structure; and the cooling oil after cooling the stator structure is gathered in the shell of the motor again so as to enter the first oil duct 2 of the rotating shaft 1 again.

In other words, the cooling oil entering the first oil passage 2 enters the left and right rotor end plates 5 respectively in two ways, and the cooling oil entering the oil groove 6 of the left rotor end plate 5 can flow from left to right through the cooling oil pipe 8 to enter the oil slinging holes 7 of the right rotor end plate 5 and be thrown out of the oil slinging holes 7 of the right rotor end plate 5. And the cooling oil entering the oil groove 6 of the right rotor end plate 5 can flow from right to left through another cooling oil pipe 8 to enter the oil slinging holes 7 of the left rotor end plate 5 and be thrown out of the oil slinging holes 7 of the left rotor end plate 5.

It can be understood that the rotor structure that this embodiment provided cools off rotor core 4 through the coolant oil of circulation in coolant oil pipe 8, can avoid the coolant oil to get rid of to between rotor structure and the stator structure from between rotor core 4's the punching sheet when cooling rotor core 4, and then increases with the frictional resistance who avoids between rotor structure and the stator structure to reach the purpose that reduces the mechanical loss of motor, reduces the efficiency of motor.

Specifically, one side of the rotor end plate 5 close to the rotor core 4 is further provided with an oil gathering counterbore 11, two ends of the cooling oil pipe 8 extend into the oil gathering counterbores 11 of the two rotor end plates 5 respectively and keep an interval with the bottom wall of the oil gathering counterbores 11, and the oil groove 6 and the oil throwing hole 7 are communicated with one oil gathering counterbore 11 respectively.

As shown in fig. 3 to 5, in the present embodiment, it is exemplarily illustrated that the oil collecting counter bores 11 are provided as circular holes, and the number of the oil collecting counter bores 11 of each rotor end plate 5 is equal to the number of the cooling oil pipes 8, while the number of the cooling oil pipes 8 is the sum of the numbers of the oil slingers 7 of the two rotor end plates 5, and the numbers of the oil slingers 7 of the two rotor end plates 5 are equal, so that the numbers of the cooling oil pipes 8 and the oil collecting counter bores 11 of each rotor end plate 5 are always even.

In this embodiment, the oil collection counterbores 11 in each rotor end plate 5 are divided into two groups, one group for communication with the oil grooves 6 and the other group for communication with the oil slinger holes 7. And for each cooling oil pipe 8, one end of the cooling oil pipe is communicated with an oil gathering counter bore 11 of one rotor end plate 5 communicated with the oil groove 6, and the other end of the cooling oil pipe is communicated with an oil gathering counter bore 11 of the other rotor end plate 5 communicated with the oil throwing hole 7. At the communication position of the cooling oil pipe 8 and the oil gathering counterbore 11, the cooling oil pipe 8 and the bottom wall of the oil gathering counterbore 11 are arranged at intervals, so that the cooling oil can enter or flow out of the cooling oil pipe 8.

As shown in fig. 3 and 4, in the present embodiment, the cooling oil entering the oil groove 6 of one rotor end plate 5 from the first oil passage 2 and the second oil passage 3 of the rotating shaft 1 may further enter the oil collection counterbore 11 communicating with the oil groove 6, and then enter the cooling oil pipe 8 communicating with the oil collection counterbore 11; and then passes through the cooling oil pipe 8 and enters the oil collecting counter bore 11 of the other rotor end plate 5, finally enters the oil throwing hole 7 communicated with the oil collecting counter bore 11 and is thrown to the stator structure from the oil throwing hole 7.

It can be understood that, this embodiment is through setting up the oil collection counter bore 11 on two rotor end plates 5, and stretch into in the oil collection counter bore 11 with cooling oil pipe 8's both ends, to be linked together with oil groove 6 of a rotor end plate 5 and the oil slinging hole 7 of another rotor end plate 5 respectively through gathering oil counter bore 11, can avoid cooling oil to leak in advance between rotor end plate 5's oil groove 6 and cooling oil pipe 8's the tip and between oil slinging hole 7 and cooling oil pipe 8's the tip, with the circulation effect of effective promotion cooling oil in the rotor structure, and then with the cooling effect that improves cooling oil to rotor structure and stator structure.

More specifically, iron core pressing plates 12 are arranged between two ends of the rotor core 4 and the two rotor end plates 5, two ends of the cooling oil pipe 8 penetrate through the two iron core pressing plates 12 respectively and are provided with limiting tables 13 which are abutted to one sides, far away from the rotor core 4, of the iron core pressing plates 12, and the limiting tables 13 extend into the oil gathering counter bores 11.

As shown in fig. 3 and 4, in the present embodiment, it is exemplarily illustrated that the core pressing plates 12 are also provided in a ring shape, which is fitted over the rotating shaft 1, and are provided in two, and the two core pressing plates 12 are respectively provided between two ends of the rotor core 4 and the two rotor end plates 5. Two ends of the cooling oil pipe 8 respectively penetrate through the two iron core pressing plates 12 and are provided with limiting tables 13, and in the embodiment, the two limiting tables 13 are formed by riveting the end parts of the cooling oil pipe 8.

Two spacing platforms 13 respectively butt in two iron core clamp plates 12 keep away from rotor core 4's one side to fix iron core clamp plate 12 on rotor core 4. Two ends of the cooling oil pipe 8 respectively extend into the oil gathering counter bores 11 of the two rotor end plates 5 through two limiting tables 13 and are communicated with the oil gathering counter bores 11.

Of course, in some embodiments, the two limiting tables 13 may be configured as hollow circular tables, and may be connected with the cooling oil pipe 8 by using a connection manner such as an interference fit plug connection, a threaded connection, or a welding connection.

It can be understood that, this embodiment forms the spacing platform 13 with two iron core pressing plates 12 looks butt through the both ends at cooling oil pipe 8 to stretch into two spacing platforms 13 respectively in the oil collection counter bore 11 of two rotor end plates 5, can strengthen the steadiness of cooling oil pipe 8 on rotor core 4, and make cooling oil pipe 8 difficult production on rotor core 4 rock or the drunkenness, and then can carry out effectual intercommunication with oil collection counter bore 11 with the both ends of guarantee cooling oil pipe 8.

It can also be understood that, in this embodiment, by providing the iron core pressing plate 12 abutting against the two limit tables 13 of the cooling oil pipe 8, the iron core pressing plate 12 can be used as a protection structure of the rotor core 4, so as to prevent the limit tables 13 from extruding and deforming the rotor core 4 or causing wear.

Specifically, the oil groove 6 comprises a plurality of radial grooves 14 arranged at intervals in the circumferential direction and a circumferential groove 15 communicated with the plurality of radial grooves 14, the oil collecting counter bore 11 is communicated with the radial grooves 14, the oil throwing holes 7 are equal in number to the radial grooves 14, and the oil throwing holes and the radial grooves are arranged in a staggered mode at intervals in the circumferential direction.

As shown in fig. 3 and 5, in the present embodiment, it is exemplarily explained that the radial grooves 14 are provided at equal intervals in the circumferential direction by 5, and the circumferential groove 15 is provided in a ring shape to communicate with the 5 radial grooves 14. Similarly, 5 oil slinger holes 7 are provided at equal intervals in the circumferential direction. Since the number of the cooling oil pipes 8 is the sum of the number of the oil slinger holes 7 of the two

rotor end plates

5, 10 cooling oil pipes 8 are provided, and correspondingly, 10 oil gathering counter holes 11 on each rotor end plate 5 are also provided. The 10 oil gathering counter bores 11 on each rotor end plate 5 are divided into two groups, and the number of each oil gathering counter bore 11 is 5, so as to be respectively communicated with the 5 oil throwing holes 7 and the 5 radial grooves 14 on the rotor end plate 5.

In the present embodiment, 10 cooling

oil pipes

8 and 10 oil collecting counter bores 11 on each rotor end plate 5 are arranged at equal intervals in the circumferential direction, so that 5

oil slingers

7 and 5 radial grooves 14 are staggered at equal intervals in the circumferential direction. Of the 10

cooling oil pipes

8, 5 cooling oil pipes 8 flow from left to right to flow from the left rotor end plate 5 to the right rotor end plate 5 and are thrown out from the oil slinging holes 7 of the right rotor end plate 5; there are also 5 cooling oil pipes 8 flowing from right to left to flow from the right rotor end plate 5 to the left rotor end plate 5 and to be thrown out of the oil slingers 7 of the left rotor end plate 5.

Of course, in some embodiments, the radial slots 14 and the oil slingers 7 may also be provided with 4, 6, 7, etc. equally spaced in the circumferential direction, respectively.

It can be understood that, in the present embodiment, through the plurality of radial slots 14 and the oil slinging holes 7 which are arranged at equal intervals in the circumferential direction, the plurality of cooling oil pipes 8 which are arranged at equal intervals in the circumferential direction may be arranged in the rotor core 4, so that a plurality of staggered cooling oil circulation paths exist in the circumferential direction of the rotor core 4, so as to improve the cooling effect of the cooling oil on the rotor core 4.

More specifically, the circumferential groove 15 is provided at one side close to the axis of the rotor end plate 5, the second oil passages 3 are communicated with the circumferential groove 15, the number of each group of the second oil passages 3 is two, and the two second oil passages 3 are arranged at equal intervals in the circumferential direction.

As shown in fig. 3 and 5, in the present embodiment, it is exemplarily explained that the annular rotor end plate 5 has an inner side close to its axis and an outer side far from its axis, the circumferential groove 15 is provided at a position close to the inner side of the rotor end plate 5, and the circumferential groove 15 penetrates the rotor end plate 5 in a direction close to the axis of the rotor end plate 5.

Along the axial of pivot 1, two sets of second oil ducts 3 set up in same position with two hoop grooves 15 respectively to make two sets of second oil ducts 3 can be linked together with two hoop grooves 15 respectively. The number of each group of the second oil passages 3 is two, that is, the two second oil passages 3 are symmetrically arranged along the axial section of the rotating shaft 1, and the axial section of the rotating shaft 1 is a section of the axis passing through the rotating shaft 1.

In this embodiment, after entering the first oil passage 2, the cooling oil enters the two annular grooves 15 from the two groups of second oil passages 3, and the cooling oil entering each group of second oil passages 3 can flow in the two second oil passages 3 of the group in opposite directions and is uniformly distributed in the annular grooves 15 so as to further flow to the 5 radial grooves 14.

It can be understood that, this embodiment sets up the circumferential groove 15 in the one side that is close to the axis of rotor end plate 5, can reach and carry out the purpose of shunting cooling oil along circumference evenly to can distribute uniformly in rotor core 4's radial when cooling oil flows to cooling oil pipe 8, and then improve the cooling effect of cooling oil to subsequent rotor core 4 and stator structure.

It can also be understood that the number of each group of the second oil passages 3 on the rotating shaft 1 is only two, and the number of the drilled holes is small, so that the structural strength and the rigidity of the rotating shaft 1 can be guaranteed.

Specifically, the rotor structure further includes magnetic steel 16, the rotor core 4 is provided with a magnetic steel slot 17 along the axial direction, and the magnetic steel 16 is disposed in the magnetic steel slot 17.

As shown in fig. 2, in the present embodiment, it is exemplarily explained that the magnetic steel slot 17 penetrates the rotor core 4 in the axial direction of the rotor core 4, the magnetic steel 16 is disposed in the magnetic steel slot 17, and the magnetic steel 16 may be fixed by bonding. The two iron core pressing plates 12 can limit the magnetic steel 16 at two ends of the rotor iron core 4 so as to prevent the magnetic steel 16 from generating axial movement. The magnetic steel 16 is used to form a magnetic field on the rotor structure.

More specifically, a plurality of pairs of magnetic steels 16 are arranged at equal intervals along the circumferential direction, each pair of magnetic steels corresponds to each cooling oil pipe 8 one by one, each pair of magnetic steels 16 is arranged in a V shape and comprises a close end close to each other and a diffusion end far away from each other, the diffusion end of each pair of magnetic steels 16 faces the direction far away from the axis of the rotor core 4, and the cooling oil pipes 8 are arranged between the diffusion ends of the pair of magnetic steels 16.

As shown in fig. 2, in the present embodiment, it is exemplarily explained that since 10 cooling oil pipes 8 are provided in the present embodiment, 10 pairs of magnetic steels 16 are provided at equal intervals in the circumferential direction on the magnetic steels 16. The number of each pair of magnetic steels 16 may be two, and the two magnetic steels 16 are symmetrically arranged along the axial section of the rotor core 4 and form a "V" shape. The converging end of each pair of magnetic steels 16 is the closed end of the V shape, and the diverging end is the open end of the V shape. The diffusion ends of each pair of magnetic steels 16 face in a direction away from the axis of rotor core 4, that is, in a direction toward the outside of rotor core 4.

And 10 cooling oil pipes 8 are respectively arranged between the diffusion ends of 10 pairs of magnetic steels 16, namely between two magnetic steels 16 forming a pair. In the present embodiment, the cooling oil pipe 8 is made of a non-magnetic material, such as stainless steel.

It can be understood that, in the present embodiment, the cooling oil pipe 8 is disposed between the diffusion ends of the pair of magnetic steels 16, so that each pair of magnetic steels 16 is disposed close to one cooling oil pipe 8, and further, the cooling oil in the cooling oil pipe 8 cools the rotor core 4 and also cools the magnetic steels 16.

Specifically, one side of the rotor end plate 5 close to the axis thereof is provided with a first positioning key 18, one side of the rotating shaft 1 far away from the axis thereof is provided with a key groove 19, and the first positioning key 18 is arranged in the key groove 19.

As shown in fig. 5 and 6, in the present embodiment, it is exemplarily illustrated that the first positioning key 18 is disposed inside the rotor end plate 5, and the first positioning key 18 is disposed in two in the circumferential direction, that is, the first positioning key 18 is disposed in two symmetrically in the axial section of the rotor end plate 5. And correspondingly, the key groove 19 is provided on the outer side of the rotating shaft 1. The key grooves 19 are equal in number to the first positioning keys 18 and correspond one to one.

The key groove 19 is provided on the rotating shaft 1 in a non-penetrating manner along the axial direction of the rotating shaft 1. The position of the rotating shaft 1 near the closed end of the keyway 19 along the axial direction of the rotating shaft 1 is provided with a limit journal 20, the rotor end plate 5 near the limit journal 20 abuts against the limit journal 20, and the rotor end plate 5 far from the limit journal 20 is fixed on the rotating shaft 1, for example, welded with the rotating shaft 1 or locked and fixed by a bolt in threaded connection with the rotating shaft 1.

It can be understood that, in the present embodiment, by matching the first positioning key 18 with the key slot 19, positioning can be performed when the rotor end plate 5 is assembled on the rotating shaft 1, so as to quickly position the two ends of the cooling oil pipe 8 in the oil collecting counter bores 11 of the two rotor end plates 5, respectively, and improve the assembly efficiency; and the rotor end plate 5 can be prevented from applying circumferential shearing force to the cooling oil pipe 8, so that the cooling oil pipe 8 is not easy to deform under pressure.

More specifically, the rotor core 4 is provided with a second positioning key 21 on a side near its axis, and the second positioning key 21 is also provided in the key groove 19.

As shown in fig. 2 and fig. 6, in the present embodiment, it is exemplarily illustrated that a protrusion is disposed on an inner side of the rotor sheet 9, and when a plurality of rotor sheets 9 are pressed and fixed to form the rotor core 4, the protrusion forms a second positioning key 21 located on the rotor core 4. The shape of the cross section of the second positioning key 21 in the axial direction of the rotating shaft 1 may be the same as that of the first positioning key 18, so that the second positioning key 21 is also disposed in the key groove 19.

It can be understood that, this embodiment is cooperated with the key groove 19 through the second positioning key 21, and it is also possible to form a limit between the rotor core 4 and the rotating shaft 1, so that the rotor core 4 is not easy to rotate relative to the rotating shaft 1, and further the cooling oil pipe 8 is not easy to deform under pressure, and the structural stability of the rotor structure is ensured.

The implementation principle of the rotor structure provided by the first embodiment of the application is as follows:

during assembly, the rotor punching sheets 9 are pressed and fixed to form the rotor core 4, then the cooling oil pipe 8 penetrates through the rotor core 4, the two iron core pressing plates 12 are sleeved at two ends of the cooling oil pipe 8 respectively, and the two iron core pressing plates 12 are abutted to two ends of the rotor core 4 respectively. Then, the two ends of the cooling oil pipe 8 are riveted to form a limit table 13. And then, a rotor end plate 5, a rotor core 4, two core pressing plates 12 and another rotor end plate 5 are sequentially sleeved on the rotating shaft 1, and then the rotor end plate 5 close to the limit journal 20 is abutted against the limit journal 20, so that the oil grooves 6 of the rotor end plate 5 are communicated with a group of second oil ducts 3. And the rotor end plate 5 far away from the limit journal 20 is fixed on the rotating shaft 1 so as to communicate the oil groove of the rotor end plate 5 with the other set of the second oil passages 3. And simultaneously, two limit platforms 13 of the cooling oil pipe 8 respectively extend into the oil collecting counter bores 11 of the two rotor end plates 5. And when the sleeve is set, the rotor end plate 5 is matched with the key slot 19 through the first positioning key 18, and the rotor core 4 is matched with the key slot 19 through the second positioning key 21.

In this embodiment, the cooling oil entering the first oil passage 2 enters the left and right rotor end plates 5 respectively in two ways, and the cooling oil entering the oil groove 6 of the left rotor end plate 5 can flow from left to right through a cooling oil pipe 8 to enter the oil throwing holes 7 of the right rotor end plate 5 and be thrown out of the oil throwing holes 7 of the right rotor end plate 5. And the cooling oil entering the oil groove 6 of the right rotor end plate 5 can flow from right to left through the other cooling oil pipe 8 to enter the oil slinging hole 7 of the left rotor end plate 5 and be thrown out of the oil slinging hole 7 of the left rotor end plate 5.

The rotor structure that this embodiment provided cools off rotor core 4 through the coolant oil of circulation in cooling oil pipe 8, can avoid the coolant oil to get rid of between rotor structure and the stator structure from between rotor core 4's the piece of punching when cooling rotor core 4, and then increases with the frictional resistance who avoids between rotor structure and the stator structure, in order to reach the purpose that reduces the mechanical loss of motor, reduces the efficiency of motor.

Example two

The second embodiment of the present application provides an oil-cooled motor, and the oil-cooled motor includes any one rotor structure that the present application provided.

All possible combinations of the technical features in the above embodiments may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure 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 application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A rotor structure, characterized in that the rotor structure comprises:

the oil pump comprises a rotating shaft (1), wherein a first oil channel (2) is arranged along the axial direction of the rotating shaft, second oil channels (3) communicated with the first oil channel (2) are arranged along the radial direction of the rotating shaft, and two groups of the second oil channels (3) are arranged along the axial direction of the rotating shaft (1);

a rotor core (4) provided on the rotating shaft (1);

the two rotor end plates (5) are arranged on the rotating shaft (1) and are respectively abutted against two ends of the rotor iron core (4), one sides, close to the rotor iron core (4), of the two rotor end plates (5) are respectively provided with an oil groove (6) and an oil throwing hole (7), the oil grooves (6) of the two rotor end plates (5) are respectively communicated with the two groups of second oil ducts (3), and the oil throwing hole (7) is obliquely arranged and penetrates through the outer side wall of the rotor end plate (5); and

and the cooling oil pipe (8) penetrates through the rotor iron core (4) along the axial direction, one end of the cooling oil pipe is communicated with the oil groove (6) of one rotor end plate (5), and the other end of the cooling oil pipe is communicated with the oil throwing hole (7) of the other rotor end plate (5).

2. The rotor structure of claim 1, characterized in that one side of the rotor end plate (5) close to the rotor core (4) is further provided with an oil gathering counterbore (11), two ends of the cooling oil pipe (8) respectively extend into the oil gathering counterbores (11) of the two rotor end plates (5) and keep a gap with the bottom walls of the oil gathering counterbores (11), and the oil groove (6) and the oil dump hole (7) are respectively communicated with one oil gathering counterbore (11).

3. The rotor structure according to claim 2, wherein an iron core pressure plate (12) is arranged between two ends of the rotor iron core (4) and two rotor end plates (5), two ends of the cooling oil pipe (8) respectively penetrate through the two iron core pressure plates (12) and are provided with a limiting table (13) which is abutted against one side of the iron core pressure plate (12) far away from the rotor iron core (4), and the limiting table (13) extends into the oil gathering counterbore (11).

4. The rotor structure according to claim 2, wherein the oil groove (6) comprises a plurality of radial grooves (14) arranged at intervals in the circumferential direction and a circumferential groove (15) communicating with the plurality of radial grooves (14), the oil gathering counter bore (11) is communicated with the radial grooves (14), and the oil slinger holes (7) are equal in number to the radial grooves (14) and are staggered at equal intervals in the circumferential direction.

5. The rotor structure according to claim 4, wherein the circumferential groove (15) is provided at a side close to the axis of the rotor end plate (5), the second oil passages (3) communicate with the circumferential groove (15), the number of the second oil passages (3) in each group is two, and the two second oil passages (3) are provided at equal intervals in the circumferential direction.

6. The rotor structure according to claim 4, characterized in that the rotor structure further comprises magnetic steel (16), the rotor core (4) is provided with magnetic steel slots (17) in the axial direction, and the magnetic steel (16) is arranged in the magnetic steel slots (17).

7. The rotor structure according to claim 6, characterized in that the magnetic steel (16) is provided with a plurality of pairs at equal intervals along the circumferential direction, each pair of the magnetic steel (16) corresponds to each cooling oil pipe (8) one by one, each pair of the magnetic steel (16) is arranged in a V shape and comprises a close end close to each other and a spread end far away from each other, the spread end of each pair of the magnetic steel (16) faces the direction far away from the axis of the rotor core (4), and the cooling oil pipe (8) is arranged between the spread ends of the pair of the magnetic steel (16).

8. The rotor structure according to claim 1, characterized in that the rotor end plate (5) is provided with a first positioning key (18) on the side close to the axis thereof, the shaft (1) is provided with a key groove (19) on the side away from the axis thereof, and the first positioning key (18) is arranged in the key groove (19).

9. A rotor structure according to claim 8, characterized in that the rotor core (4) is provided with a second positioning key (21) on the side near its axis, which second positioning key (21) is also provided in the key slot (19).

10. An oil-cooled electric machine, characterized in that the oil-cooled electric machine comprises a rotor structure as claimed in any one of claims 1 to 9.