CN216162561U - Oil-cooled stator structure, motor and vehicle - Google Patents

Abstract

The utility model discloses an oil-cooled stator structure, a motor and a vehicle, wherein the oil-cooled stator structure comprises a shell, wherein the inner wall of the shell is provided with a plurality of radially sunken oil grooves; the outer wall of the stator core is matched with the inner wall of the shell to form an oil path, and two ends of the stator core are respectively provided with an end winding extending out of the shell; the end pressing plates are pressed into the shell from two ends of the shell respectively to seal the oil circuit, a plurality of oil injection holes communicated with the oil circuit are formed in at least part of the outer side surface of each end pressing plate at intervals along the circumferential direction, and oil blocking parts are arranged on the outer sides of the oil injection holes and are positioned on the peripheries of the corresponding end windings; the side wall of the shell is provided with an oil duct, one end of the shell is provided with an oil inlet communicated with the oil duct, the other end of the shell is provided with an oil outlet, and the oil duct is communicated with the oil duct. One part of oil is sprayed on the corresponding end winding, one part of oil enters the rotor oil way through the oil outlet, and the other part of oil is sprayed on the stator iron core. The oil spraying coverage of the stator structure is sufficient, and the cooling efficiency of the stator structure is improved.

Description

Oil-cooled stator structure, motor and vehicle

Technical Field

The utility model relates to the technical field of motor cooling, in particular to an oil-cooled stator structure, a motor with the oil-cooled stator structure and a vehicle with the motor.

Background

The electric automobile industry is developing at a high speed, and the market of electric automobiles in the future will be further expanded as environmental protection measures and environmental policies of various countries become stricter. The permanent magnet synchronous motor is used as a core component in the electric automobile, and the characteristics of the permanent magnet synchronous motor determine the main performance indexes of the automobile.

With the increase of the power of the motor, the requirement of the field of new energy automobiles on the motor is higher and higher, and the heat dissipation of the motor directly restricts the improvement of the power of the electric automobile and the electrical and mechanical properties of the motor.

At present, the motor is mainly cooled by adopting a water cooling or oil cooling mode. The cooling oil can directly act on the internal heating part for cooling, thereby greatly improving the cooling efficiency. However, in the existing design, a mode that cooling oil falls to the end part of the stator and a winding is adopted for cooling is adopted, and the mode has the problems of insufficient oil spraying coverage and low cooling efficiency.

SUMMERY OF THE UTILITY MODEL

In view of the above technical problems, the present invention aims to: the utility model provides a cold stator structure of oil, motor and vehicle, through set up on the tip clamp plate at both ends and keep off oil portion, the setting of cooperation oil groove and oil duct, make partly spout oil spout hole injection on through the tip clamp plate through the oil groove and go out, be kept off oil portion and block, oil drenches under the action of gravity and falls on end winding, partly oil drenches in stator core's periphery through the oil circuit entering casing, partly oil gets into the rotor oil circuit through the oil-out in addition, stator structure drenches the oil and covers fully, improve stator structure's cooling efficiency.

The technical scheme of the utility model is as follows:

one of the objects of the present invention is to provide an oil-cooled stator structure, comprising:

the inner wall of the shell is provided with a plurality of radially sunken oil grooves;

the outer wall of the stator core is matched with the inner wall of the shell, so that the oil grooves form oil passages, and end windings are arranged at two ends of the stator core respectively;

the end pressing plates are pressed into the shell from two ends of the shell respectively to seal the oil way, a plurality of oil injection holes communicated with the oil way are formed in at least part of the outer side surface of any end pressing plate at intervals along the circumferential direction, and oil blocking parts are arranged on the outer sides of the oil injection holes and are positioned on the peripheries of the corresponding end windings so as to spray oil sprayed from the oil injection holes onto the corresponding end windings;

the side wall of the shell is provided with an oil duct, one end of the shell is provided with an oil inlet communicated with the oil duct, the other end of the shell is provided with an oil outlet communicated with the rotor oil duct and the oil duct, and the oil duct is communicated with the oil duct.

Optionally, the oil passage includes:

the oil inlet channel extends along the axial direction and is connected with the oil inlet;

the oil outlet channel is connected to one end, far away from the oil inlet, of the oil inlet channel and is connected with the oil outlet;

one end of the branch oil duct is connected to the joint of the oil inlet duct and the oil outlet duct, the other end of the branch oil duct extends towards one of the oil grooves and is connected with the oil groove, and the oil groove is communicated with the oil spray holes at the two ends and the rest of the oil grooves;

the inner diameter of the branch oil duct is larger than that of the oil groove, and the inner diameter of the oil groove is larger than the aperture of the oil injection hole, so that part of oil enters the oil groove through the branch oil duct and is injected to the corresponding oil blocking part through the oil injection holes at two ends under the action of internal pressure to form an oil film, and the oil film is dripped on the corresponding end winding under the action of gravity to cool the end winding.

Optionally, the oil groove includes with the oil duct directly links to each other first oil groove and interval setting are in on the internal perisporium of casing a plurality of with the second oil groove that the oil duct is not linked to each other, first oil groove with the both ends opening of second oil groove and with be formed with the interval between the corresponding tip clamp plate so that the second oil groove with first oil groove intercommunication forms the oil circuit.

Optionally, the number of the branch oil ducts is two, and the two branch oil ducts are arranged in parallel at the position where the oil inlet duct is connected with the oil outlet duct;

the first oil groove comprises two sections of separated sub-grooves, and one ends of the two sections of sub-grooves, which are close to each other, are respectively connected with one of the branch oil passages.

Optionally, the diameter of the oil outlet passage is smaller than that of the branch oil passage, and the diameters of the oil outlet passage and the branch oil passage are both smaller than that of the oil inlet passage.

Optionally, the oil blocking portion is arc-shaped.

Optionally, the oil blocking portion is a minor arc with a central angle less than or equal to 90 °.

Optionally, the stator core is in interference fit with the housing.

It is another object of the present invention to provide an electric machine comprising an oil-cooled stator structure as defined in any of the above.

It is also an object of the utility model to provide a vehicle comprising an electric machine as described above.

Compared with the prior art, the utility model has the advantages that:

according to the oil-cooled stator structure, the oil blocking parts are arranged on the end pressing plates at two ends, and the oil grooves and the oil ducts are matched, so that a part of oil is sprayed out through the oil grooves through the oil spraying holes on the end pressing plates and is blocked by the oil blocking parts, the oil is sprayed on the end windings under the action of gravity, a part of oil enters the shell through the oil duct and is sprayed on the periphery of the stator core, a part of oil enters the rotor oil duct through the oil outlet, the oil spraying coverage of the stator structure is sufficient, and the cooling efficiency of the stator structure is improved.

Drawings

The utility model is further described with reference to the following figures and examples:

FIG. 1 is a schematic structural diagram of an oil-cooled stator structure according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of the oil-cooled stator structure of the embodiment of the present invention without the end pressing plate;

FIG. 3 is a schematic structural view of a housing of an oil-cooled stator structure according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an oil passage and an oil passage of the oil-cooled stator structure according to the embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of an oil-cooled stator structure taken along the axial direction according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an end pressing plate and an oil blocking portion of an oil-cooled stator structure according to an embodiment of the present invention;

fig. 7 is a structural schematic diagram of a cross section of the oil-cooled stator structure of the embodiment of the utility model, which is cut along a direction perpendicular to the axial direction.

Wherein: 1. a housing; 10. an oil inlet; 11. an oil inlet channel; 12. an oil outlet channel; 13. a branch oil passage; 14. an oil outlet; 15. an oil sump; 151. a first oil groove; 1511. a first sub-groove; 1512. a second sub-groove; 152. a second oil groove; 16. an oil path; 2. an end winding; 3. an end pressing plate; 31. an oil retaining portion; 32. an oil spray hole; 4. a stator core is provided.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

Example (b):

referring to fig. 1 to 7, an oil-cooled stator structure according to an embodiment of the present invention includes a housing 1, a stator core 4, an end winding 2, an end pressure plate 3, and an oil blocking portion 31.

As shown in fig. 3, the housing 1 has a cylindrical structure with two open ends and a hollow middle part. A plurality of radially recessed oil grooves 15 are formed in the inner wall of the housing 1. Specifically, as shown in fig. 5, the oil groove 15 is divided into two parts, one part of the oil groove 15 is a first oil groove 151 including two separate grooves which are spaced apart from each other, that is, not communicated with each other, and the other part of the oil groove 15 is a plurality of second oil grooves 152 which are circumferentially arranged in parallel at intervals on the inner circumferential wall of the casing 1. The first oil groove 151 is divided into a first sub groove 1511 and a second sub groove 1512. The first sub-groove 1511 and the second sub-groove 1512 extend towards two ends of the housing 1 respectively, the end openings of the first sub-groove 1511 and the second sub-groove 1512 are communicated with the oil spray hole 32, and a space is formed between each of the first sub-groove 1511 and the second sub-groove 1512 and the end pressure plate 3 at the two ends, and similarly, a space is also formed between the two end openings of the second sub-groove 1512 and the end pressure plates 3 at the two ends, so that the first sub-groove 1511 and the second sub-groove 1512 can be communicated with the second sub-groove 1512 to form the oil path 16. So set up for partly oil is respectively through first minute groove 1511 and the blowout hole 32 blowout on the tip clamp plate 3 at both ends through second minute groove 1512, because the setting of keeping off oil portion 31, oil through blowout hole 32 blowout can drip on corresponding end winding 2 under the action of gravity, partly oil flows into in the second oil groove 152 through above-mentioned clearance in addition, also drench on the stator core 4 in casing 1 in getting into casing 1, make the oil that drenches of stator structure cover abundant, improved cooling efficiency greatly.

As shown in fig. 4, an oil passage is further provided in the side wall of the housing 1, one end of the oil passage, that is, the front end shown in fig. 4, is an oil inlet 10, the rear end is an oil outlet 14, the oil passage corresponding to the oil inlet 10 is an oil inlet passage 11, the oil passage corresponding to the oil outlet 14 is an oil outlet passage 12, and the oil inlet passage 11 and the oil outlet passage 12 extend in the axial direction. Wherein the oil outlet channel 12 is adapted to be connected to the rotor oil circuit such that part of the oil enters the rotor oil circuit via the oil outlet 14. In order to enable part of oil to enter the oil groove 15 to spray and cool the end winding 2 and the stator core 4, a branch oil passage 13 is arranged in parallel at the joint of the oil inlet passage 11 and the oil outlet passage 12. Specifically, the two branch oil passages 13 include two branch oil passages 13, the two branch oil passages 13 are arranged at the connecting position of the oil inlet passage 11 and the oil outlet passage 12 in parallel, one end of one branch oil passage 13 is connected with one end of the first branch groove 1511, one end of the other branch oil passage 13 is connected with one end of the second branch groove 1512, so that the oil in the oil inlet passage 11 is divided into three parts, one part enters the oil outlet passage 12 and enters the rotor oil passage through the oil outlet 14, one part enters the first branch groove 1511 through one branch oil passage 13, the other part enters the second branch groove 1512 through the other branch oil passage 13, the oil entering the first branch groove 1511 is divided into two parts, one part is sprayed out through the oil spray hole 32 on the end pressing plate 3 at one end under the effect of internal pressure to be sprinkled on the end winding 2 at the end, the other part flows into the second oil groove 152 through the gap between the first branch groove 1511 and the end pressing plate 3, similarly, the oil of second partial groove 1512 also divides into two the tunnel, wherein one kind is on the end winding 2 of this end in order to trickle down through the nozzle opening 32 blowout of the tip clamp plate 3 of the other end under the effect of internal pressure, in another part flows into second oil groove 152 through the clearance between second partial groove 1512 and the tip clamp plate 3 of this end, the oil that flows into in second oil groove 152 can trickle down on stator core 4 at last, because second oil groove 152 sets up along circumference interval, thereby make stator core 4's periphery all can trickle have the cooling oil. In some embodiments, the two branch oil passages 13 are arranged in parallel at intervals and extend inward in the radial direction of the casing 1, that is, downward as shown in fig. 4. As an alternative embodiment, the number of the branch oil channels 13 may be only one, the first oil grooves 151 may not be provided at intervals, the oil is directly divided into two paths after entering the first oil grooves 151 through the branch oil channels 13, the two paths flow to the end pressing plates 3 at the two ends respectively, and part of the oil is sprayed out through the oil spray holes 32 and falls on the corresponding end windings 2, and the other part of the oil flows into the second oil groove 152 through the gap and falls on the stator core 4. As a modified embodiment, the number of the branch oil passages 13 is one, and a partition plate is provided inside the branch oil passage 13 or only in an outlet of the branch oil passage 13, so that the oil is divided into two paths, and the first oil groove 151 may be provided at intervals of one or two, and is not particularly limited. As another alternative, there is no gap between the end of the oil groove and the corresponding end press plate, and correspondingly, there is a communication oil channel between adjacent oil grooves, so that all the oil grooves are communicated with each other to form a circulation oil channel.

In some preferred embodiments, the diameter of the oil outlet passage 12 is smaller than the diameter of the branch oil passage 13, and the diameters of both the oil outlet passage 12 and the branch oil passage 13 are smaller than the diameter of the oil inlet passage 11. The diameter of the oil outlet passage 12 is smaller than that of the branch oil passage 13, so that most of oil can be sprayed and covered on the stator structure including the stator core 4 and the end winding 2 through the branch oil passage 13, and the cooling efficiency of the stator structure is improved. Because the end pressing plate 3 is pressed into the housing 1 from two ends to close the oil path, the diameter of the branch oil path 13 is designed to be smaller than that of the oil inlet channel 11, the inner diameter of the oil groove 15, namely the width between two side walls along the circumferential direction, is smaller than that of the branch oil path 13, so that the oil pressure entering the oil groove 15 is increased, and the aperture of the oil injection hole 32 is much smaller than that of the oil groove 15, so that the oil has enough pressure to be injected to the oil blocking part 31 through the oil injection hole 32 to form an oil film, and then the oil film falls onto the end winding 2 under the action of gravity and cools the end winding 2.

In some embodiments, the oil dam 31 has an arc shape. In some preferred embodiments, the oil blocking portion 31 is a minor arc with a central angle less than or equal to 90 °, and the specific angle is not particularly limited, and one skilled in the art can select and design the minor arc according to specific requirements. As shown in fig. 1, 4 and 6, the pressing plate body of the end pressing plate 3 is annular, the oil blocking portion 31 is disposed outside the end pressing plate 3 and extends outward along the axial direction, the oil blocking portion 31 is arc-shaped and matched with the pressing plate body of the end pressing plate 3 in shape, a plurality of oil injection holes 32 are circumferentially arranged on the pressing plate body of the end pressing plate 3 corresponding to the oil blocking portion 31, and the diameter of each oil injection hole 32 is far smaller than that of the oil inlet 10, so that part of oil can be injected onto the oil blocking portion 31 along the circumferential direction through the oil injection holes 32 with small diameter under the pressure action of the internal oil pressure, it should be noted that the axial extending distance of the oil blocking portion 31 does not exceed the end winding 2, as shown in fig. 4, the oil blocking portion 31 is located above the periphery of the end winding 2, so that the oil sprayed onto the oil blocking portion 31 can be sprayed onto the peripheral surface of the end winding 2 under the action of gravity. The oil blocking portion 31 is arc-shaped, so that the processing cost of the oil blocking portion 31 can be reduced while the oil spraying effect is ensured, and if the oil blocking portion 31 is arc-shaped with the size of the end pressing plate 3 or the central angle is larger than 90 degrees or larger than 180 degrees, part of the oil blocking portion 31 below the end winding 2 can be oiled and can not be sprayed on the end winding 2. As an alternative embodiment, the oil blocking portion 31 of each end pressure plate 3 may be formed by a plurality of small arc-shaped segments arranged at intervals along the circumferential direction of the end pressure plate 3, and is not particularly limited. It should be noted that the end pressing plates at the two ends are symmetrical structures including the oil blocking parts, and the same die can be adopted for production and processing, so that the development cost is reduced.

The oil blocking part 31 is connected with the pressing plate body of the corresponding end pressing plate 3 through a plurality of connecting columns at intervals. In some preferred embodiments, the oil baffle 31 is of unitary construction with the end platen 3. The processing is convenient.

In some preferred embodiments, as shown in fig. 7, the stator core 4 is interference-fitted with the housing 1 such that the oil groove 15 between the outer wall of the stator core 4 and the inner wall of the housing 1 forms an oil path 16. That is, the stator core 4 and the housing 1 may be fitted with a gap therebetween.

The embodiment of the utility model also provides a motor which comprises the oil-cooled stator structure of the embodiment. Other structures in the motor, such as the rotor and the like, are not described or limited in detail and are conventional structures. Due to the adoption of the oil cooling stator structure, the oil cooling stator structure at least has the beneficial effects of the oil cooling stator structure.

The embodiment of the utility model also provides a vehicle, for example, the vehicle is a new energy automobile, and the motor comprises the motor of the embodiment. Due to the adoption of the motor, the oil-cooled stator structure and the motor have the beneficial effects at least.

It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.

Claims (10)

1. An oil-cooled stator structure, comprising:

the inner wall of the shell (1) is provided with a plurality of radially sunken oil grooves (15);

the outer wall of the stator core (4) is matched with the inner wall of the shell (1) so that the oil grooves (15) form an oil path (16), and end windings (2) are arranged at two ends of the stator core (4);

the end pressing plates (3) are pressed into the shell (1) from two ends of the shell (1) respectively to seal the oil passages (16), at least part of the outer side surface of any end pressing plate (3) is provided with a plurality of oil injection holes (32) communicated with the oil passages (16), the outer side of each oil injection hole (32) is provided with an oil blocking part (31), and the oil blocking parts (31) are positioned on the periphery of the corresponding end winding (2) to spray oil sprayed from the oil injection holes (32) onto the corresponding end winding (2);

the oil-cooled rotor is characterized in that an oil duct is formed in the side wall of the shell (1), an oil inlet (10) communicated with the oil duct is formed in one end of the shell (1), an oil outlet (14) communicated with a rotor oil duct (16) and the oil duct is formed in the other end of the shell (1), and the oil duct is communicated with the oil duct (16).

2. The oil-cooled stator structure of claim 1, wherein the oil passage comprises:

the oil inlet channel (11) extends along the axial direction and is connected with the oil inlet (10);

the oil outlet channel (12) is connected to one end, far away from the oil inlet (10), of the oil inlet channel (11) and is connected with the oil outlet (14);

one end of the branch oil channel (13) is connected to the joint of the oil inlet channel (11) and the oil outlet channel (12), the other end of the branch oil channel extends towards one of the oil grooves (15) and is connected with the oil groove (15), and the oil groove (15) is communicated with the oil spray holes at the two ends and the rest of the oil grooves (15);

the inner diameter of the branch oil duct (13) is larger than that of the oil groove (15), the inner diameter of the oil groove (15) is larger than the aperture of the oil spray hole (32), so that part of oil enters the oil groove (15) through the branch oil duct (13), is sprayed to the corresponding oil blocking part (31) through the oil spray holes (32) at two ends under the action of internal pressure to form an oil film, and the oil film is sprayed on the corresponding end winding (2) under the action of gravity to cool the end winding.

3. An oil-cooled stator structure according to claim 2, wherein the oil groove (15) comprises a first oil groove (151) directly connected with the oil passage and a plurality of second oil grooves (152) arranged on the inner peripheral wall of the housing (1) at intervals and not connected with the oil passage, and the first oil groove (151) and the second oil groove (152) are open at two ends and form an interval with the corresponding end pressing plate (3) so that the first oil groove (151) is communicated with the plurality of second oil grooves (152) to form the oil passage (16).

4. The oil-cooled stator structure according to claim 3, wherein the number of the branch oil passages (13) is two, and the two branch oil passages (13) are arranged in parallel at the position where the oil inlet passage (11) is connected with the oil outlet passage (12);

the first oil groove (151) comprises two sections of separated sub-grooves, and one ends of the two sections of sub-grooves, which are close to each other, are respectively connected with one of the branch oil passages (13).

5. An oil-cooled stator structure according to any one of claims 2-4, characterized in that the diameter of the oil outlet passage (12) is smaller than the diameter of the branch oil passage (13), and the diameters of the oil outlet passage (12) and the branch oil passage (13) are both smaller than the diameter of the oil inlet passage (11).

6. An oil-cooled stator structure according to claim 1, characterized in that the oil baffle (31) is curved.

7. An oil-cooled stator structure according to claim 6, characterized in that the oil dam (31) is a minor arc having a central angle of 90 ° or less.

8. An oil-cooled stator structure according to claim 1, characterized in that the stator core (4) is interference fitted with the housing (1).

9. An electrical machine comprising an oil-cooled stator structure according to any of claims 1-8.

10. A vehicle characterized by comprising the electric machine of claim 9.

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