An oil-cooled electric machine

Abstract

The utility model discloses an oil cooling motor, include: casing, stator core, seal is located in the inside of casing, and stator core includes: first core part, and the inner wall of casing is defined with first oil inlet channel together with the outer surface, second core part is equipped with a plurality of second oil inlet channel who sets up interval along the circumference, and each second oil inlet channel is linked together with first oil inlet channel, third core part is equipped with a plurality of oil passage who sets up interval along the circumference, and the one end of each oil passage along the axial direction corresponds and links together a plurality of second oil inlet channel, fourth core part is equipped with a plurality of oil injection part, and the other end of each oil passage along the axial direction corresponds and links together a plurality of oil injection part, cooling oil can flow through first oil inlet channel a plurality of second oil inlet channel, a plurality of oil passage and a plurality of oil injection part in proper order, and is sprayed by a plurality of oil injection part. The oil passage of the utility model can mix the cooling oil that flows from different oil inlet channels, effectively reduces the flow resistance, guarantees the even oil temperature.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially a kind of oil-cooled motor. BACKGROUND

[0002] Market for new energy three electric systems power density and system speed requirement is higher and higher, in order to achieve this purpose, the cooling system of three electric systems is improved from original water cooling to oil cooling, so that reducer and motor share oil liquid.Under such premise, motor needs to have a relatively closed oil cavity to let oil liquid cool stator core and winding, to obtain higher sustained power.

[0003] For this, the current mainstream motor cooling scheme is usually to adopt sealed plastic part to cooperate with stator core to form sealed oil cavity, and oil liquid flowing through sealed oil cavity will eventually drip or spray to winding, to complete the cooling of stator core and winding.

[0004] However, in actual production, the manufacturing requirement of plastic part, the assembly requirement between plastic part and stator core are relatively strict, so the above scheme will increase higher design cost, material cost and assembly process cost, and the assembly defects between the two will also increase certain failure risk.

[0005] More importantly, the oil passage design of sealed oil cavity is also critical to motor performance.Considering the limited space of motor, the oil passage is usually designed to be relatively narrow, which will increase the flow resistance of cooling oil, resulting in that motor system needs greater pumping pressure, improves the cost of motor system, that is, when motor is running, the pumping capacity of oil pump can cause the phenomenon of uneven oil temperature of cooling oil in the direction of gravity, which will cause local high temperature point, cause the bucket effect, cannot guarantee the sustained or peak capacity of motor, improves the overall cost of motor system. SUMMARY

[0006] The utility model discloses a kind of oil-cooled motors, the oil passage in the inside can be mixed with cooling oil flowing from different oil inlet channels, effectively reduce flow resistance, guarantee oil temperature uniform, and the oil-cooled motor of the utility model does not need to configure extra cooling structure, saves material cost, assembly cost and process cost.

[0007] To solve the above technical problems, the embodiment of the utility model discloses an oil-cooled motor, comprising:

[0008] Shell;

[0009] Stator core, sealing is arranged in the inside of the shell, and the stator core comprises:

[0010] The first iron core part has an outer surface that cooperates with an inner wall of the shell to define a first oil inlet channel;

[0011] The second iron core part has a plurality of second oil inlet channels arranged at intervals in a circumferential direction, each of the second oil inlet channels being in communication with the first oil inlet channel;

[0012] The third iron core part has a plurality of oil passing channels arranged at intervals in the circumferential direction, each of the oil passing channels having one end in communication with a plurality of the second oil inlet channels in the axial direction;

[0013] The fourth iron core part has a plurality of oil injection portions, each of the oil passing channels having another end in communication with a plurality of the oil injection portions in the axial direction;

[0014] The external cooling oil can sequentially flow through the first oil inlet channel, the plurality of second oil inlet channels, the plurality of oil passing channels and the plurality of oil injection portions, and be sprayed out of the plurality of oil injection portions to the winding.

[0015] With the above technical solution, the oil-cooled motor of the embodiment of the present application adopts four different types of iron cores (i.e., the first iron core part, the second iron core part, the third iron core part and the fourth iron core part), and different cooling channels (i.e., the first oil inlet channel, the second oil inlet channel, the oil passing channel and the oil injection portion) are arranged in the four iron cores respectively, so that the external cooling oil flows through the cooling channels, thereby achieving effective cooling of the oil-cooled motor while maintaining moderate flow resistance and balanced oil temperature.

[0016] Specifically, the external cooling oil first enters the first oil inlet channel of the first iron core part, and is branched to the plurality of second oil inlet channels in the second iron core part during the flow in the first oil inlet channel. Since each of the oil passing channels of the third iron core part can communicate with and cover a plurality of the second oil inlet channels, firstly, the cooling oil flowing out of the plurality of second oil inlet channels (for example, three) can flow into the same oil passing channel, and the oil mixing in the oil passing channel can ensure uniform oil mixing and reduce the possibility of vortex and turbulence of the oil flowing out of the second oil inlet channel, thereby reducing the flow resistance. Secondly, since each of the oil passing channels can communicate with a plurality of the second oil inlet channels, it also means that the size of each of the oil passing channels is relatively large, which can further reduce the flow resistance and effectively alleviate the pumping pressure of the external oil pump.

[0017] Therefore, the cooling channels (i.e., the first oil inlet channel, the second oil inlet channel, the oil passing channel and the oil injection portion) in the oil-cooled motor of the embodiment of the present application effectively reduce the flow resistance of the cooling oil and the pumping pressure of the external oil pump, thereby alleviating the phenomenon of uneven oil temperature and avoiding affecting the performance of the motor; at the same time, the pumping conditions (such as high pressure and high flow) of the external oil pump are also effectively reduced, and the design cost and manufacturing cost of the motor system are reduced.

[0018] In addition, compared with the traditional cooling scheme, the oil-cooled motor of the embodiment of the application can achieve effective cooling without configuring redundant cooling structures (such as plastic parts), thereby saving material cost, assembly cost and process cost, and reducing the failure risk of assembly between the oil-cooled motor and the traditional plastic part.

[0019] According to another specific embodiment of the utility model, the second core part includes a plurality of second core punches stacked along the axial direction, each of the second core punches is provided with a plurality of oil inlet holes, the plurality of oil inlet holes are arranged at intervals along the circumferential direction, and the plurality of oil inlet holes of the plurality of second core punches are stacked along the axial direction to form the plurality of second oil inlet channels.

[0020] According to another specific embodiment of the utility model, the third core part includes one third core punch or a plurality of third core punches stacked along the axial direction, each of the third core punches is provided with a plurality of oil passing openings, and the plurality of oil passing openings are arranged at intervals along the circumferential direction; the plurality of oil passing openings of the one third core punch form the plurality of oil passing channels, or the plurality of oil passing openings of the plurality of third core punches are stacked along the axial direction to form the plurality of oil passing channels; wherein along the axial direction, the projection of each of the oil passing openings covers the projections of a plurality of the oil inlet holes.

[0021] According to another specific embodiment of the utility model, each of the oil inlet holes does not penetrate the outer periphery of the corresponding second core punch.

[0022] According to another specific embodiment of the utility model, each of the oil passing openings does not penetrate the outer periphery of the corresponding third core punch.

[0023] According to another specific embodiment of the utility model, each of the oil inlet holes is in a rectangular shape.

[0024] According to another specific embodiment of the utility model, each of the oil passing openings is in an irregular rectangular shape.

[0025] According to another specific embodiment of the utility model, the first core part includes a plurality of first core parts, each of the first core parts includes a plurality of convex parts, the plurality of first core parts are stacked along the axial direction, and the plurality of convex parts are staggered and attached to the inner wall of the shell to define the first oil inlet channel between the plurality of convex parts of the adjacent first core parts.

[0026] According to another specific embodiment of the present application, each of the first core portions comprises a plurality of first core punching sheets stacked along the axial direction, each of the first core punching sheets is provided with a plurality of protrusions, the plurality of protrusions are arranged at intervals along the circumferential direction, and the plurality of protrusions of the plurality of first core punching sheets are stacked along the axial direction to form the plurality of protrusions.

[0027] According to another specific embodiment of the present application, the fourth core portion comprises one fourth core punching sheet or a plurality of fourth core punching sheets stacked along the axial direction, each of the fourth core punching sheets is provided with a plurality of oil injection holes, the plurality of oil injection holes are arranged at intervals along the circumferential direction, and the plurality of oil injection holes of the one fourth core punching sheet form the plurality of oil injection portions, or the plurality of oil injection holes of the plurality of fourth core punching sheets are stacked along the axial direction to form the plurality of oil injection portions.

[0028] According to another specific embodiment of the present application, the first core portion, the second core portion, the third core portion and the fourth core portion each comprise a plurality of,

[0029] Along the axial direction, the plurality of first core portions are located in the middle of the stator core, and the opposite sides of the plurality of first core portions are sequentially provided with the plurality of second core portions, the plurality of third core portions and the plurality of fourth core portions respectively. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1A An exploded view of the oil-cooled motor according to an embodiment of the present application is shown.

[0031] Figure 1B A sectional view of the oil-cooled motor according to an embodiment of the present application is shown.

[0032] Figure 2 A perspective view of the oil-cooled motor according to an embodiment of the present application is shown.

[0033] Figure 3 A perspective view of the oil-cooled motor according to an embodiment of the present application is shown. Figure 2 ; wherein the winding is not shown in the figure.

[0034] Figure 4 A perspective view of the first core portion according to an embodiment of the present application is shown.

[0035] Figure 5 A perspective view of the second core portion according to an embodiment of the present application is shown.

[0036] Figure 6 A perspective view of the third core portion and the fourth core portion according to an embodiment of the present application is shown.

[0037] Figure 7A fluid domain schematic view of an oil cooling motor oil cavity is shown in the embodiment of the utility model.

[0038] Figure 8 A front view of a first core punching sheet is shown in the embodiment of the utility model.

[0039] Figure 9 A front view of a second core punching sheet is shown in the embodiment of the utility model.

[0040] Figure 10 A partial enlarged view one of the oil cooling motor is shown in the embodiment of the utility model.

[0041] Figure 11 A front view of a third core punching sheet is shown in the embodiment of the utility model.

[0042] Figure 12 A front view of a fourth core punching sheet is shown in the embodiment of the utility model.

[0043] Figure 13 A partial enlarged view of the oil cooling motor is shown in the embodiment of the utility model Figure 2 . DETAILED DESCRIPTION

[0044] Other advantages and effects of the present application can be easily understood by those skilled in the art from the content disclosed in the present specification. Although the description of the present application will be introduced in combination with the preferred embodiments, this does not mean that the features of the present application are limited to the embodiments. On the contrary, the purpose of introducing the present application in combination with the embodiments is to cover other options or modifications which can be extended based on the claims of the present application. In order to provide a deep understanding of the present application, many specific details will be included in the following description. The present application can also be implemented without using these details. In addition, in order to avoid confusion or obscure the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0045] It should be noted that in the present specification, similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0046] In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0047] The terms "first", "second", and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arranged", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present embodiment can be understood according to the specific circumstances.

[0049] In order to make the purpose, technical scheme and advantages of the utility model more clear, the embodiments of the utility model will be further described in detail below with reference to the drawings.

[0050] Reference Figure 1A and Figure 1B The oil-cooled motor 100 provided by the present embodiment comprises a housing 110, a stator core 120 and a winding 130. As can be seen, the stator core 120 is sealingly arranged inside the housing 110 (as shown in Figure 1B ), the winding 130 is arranged in the stator core 120, and is exposed at the axial two ends of the stator core 120.

[0051] Reference Figure 2 and Figure 3 The stator core 120 of the present embodiment comprises a first core part 121, a second core part 122, a third core part 123 and a fourth core part 124. Among them, along the axial direction (as shown in the Z direction in Figure 2 and Figure 3 ), the first core part 121 is located in the middle of the stator core 120, the second core part 122 is connected with the first core part 121, the third core part 123 is connected with the second core part 122, and the fourth core part 124 is connected with the third core part 123.

[0052] Reference Figure 3In one possible implementation, the second core portion 122, the third core portion 123, and the fourth core portion 124 each include two portions, wherein, along the axial direction (e.g., Figure 3 (shown in the Z direction), the first core portion 121 is located in the middle of the stator core, and the opposite sides of the first core portion 121 (i.e., Figure 3 A second iron core 122, a third iron core 123, and a fourth iron core 124 are respectively provided on the side indicated by the Z1 direction and the side indicated by the Z2 direction. That is to say, with the first iron core 121 in the middle as the boundary, the second iron core 122, the third iron core 123, and the fourth iron core 124 are arranged symmetrically along the axial direction.

[0053] In another possible implementation, although Figure 4 Although not shown, the second core portion 122, the third core portion 123 and the fourth core portion 124 may be provided sequentially on only one side of the first core portion 121 (such as the side indicated by the Z1 direction or the side indicated by the Z2 direction). This application embodiment does not limit this.

[0054] Furthermore, the embodiments of this application do not limit the number of the second core portion 122, the third core portion 123, and the fourth core portion 124. Taking the second core portion 122 as an example (the third core portion 123 and the fourth core portion 124 can be arranged in the same way), two, three, or four second core portions 122 can be provided on one side of the first core portion 121 (such as the side indicated by the Z1 direction), and one, three, five, or six second core portions 122 can be provided on the other side of the first core portion 121 (such as the side indicated by the Z2 direction). That is to say, any number of second core portions 122 on either side of the first core portion 121 can be selected; the number of second core portions 122 on opposite sides of the first core portion 121 can be equal or unequal.

[0055] At the same time, refer to Figure 4 , Figure 4 An exemplary perspective view of the first iron core portion 121 is shown.

[0056] The first core portion 121 includes eight, and the eight first core portions 121 are arranged axially (e.g., ...). Figure 4 The first iron core portion 121 is stacked in the Z direction shown in the figure. However, the number of first iron core portions 121 is not limited in the embodiments of this application. For example, two, three, seven or other numbers of first iron core portions 121 may be provided.

[0057] refer to Figure 1B and combined Figure 4 As can be seen, the outer surface of the first iron core portion 121 and the inner wall 111 of the housing 110 together define the first oil inlet channel 140.

[0058] As shown in Figure 4 , the first oil inlet channel 140 exemplarily includes an annular channel 141 (as shown by the dotted single arrow in Figure 4 ) and a plurality of oil inlet branches 142 (as shown by the dotted double arrows in Figure 4 ).

[0059] The annular channel 141 is arranged along the circumferential direction (as shown by the R direction in Figure 4 ) of the motor 100, and the plurality of oil inlet branches 142 extend along the axial direction (as shown by the Z direction in Figure 4 ) of the motor 100. Figure 5 Only a part of the number of oil inlet branches 142 is exemplarily shown in , but the number of oil inlet branches 142 is not specifically limited in the embodiments of the present application, and can be selected according to the actual cooling scheme of the motor 100.

[0060] In a possible implementation, it can be seen that each first core portion 121 includes a plurality of protrusions 180, and when the eight first core portions 121 are stacked along the axial direction, the plurality of protrusions 180 of each first core portion 121 are axially staggered, and when the stator core is assembled with the shell 110, the protrusions 180 of the first core portion 121 can be attached to the inner wall 111 of the shell 110, so that the plurality of protrusions 180 of the adjacent first core portions 121 can define the first oil inlet channel 140.

[0061] Figure 3 Referring to Figure 5 and in combination with Figure 5 , a perspective view of the second core portion 122 is exemplarily shown.

[0062] Although Figure 5 two second core portions 122 are shown, but the number of second core portions 122 is not specifically limited in the embodiments of the present application, for example, it can also be three, ten, twenty or more.

[0063] The inside of each second core portion 122 is provided with forty-eight second oil inlet channels 150, and each second oil inlet channel 150 is exemplarily rectangular, but the shape thereof is not limited in the embodiments of the present application. The forty-eight second oil inlet channels 150 are arranged at intervals along the circumferential direction (as shown by the R direction in Figure 5 ), and each second oil inlet channel 150 extends along the axial direction (as shown by the Z direction in Figure 3 ), and is in communication with the first oil inlet channel 140 (as shown in Figure 6 ).

[0064] For example, the number of second oil inlet channels 150 is not specifically limited in the embodiments of this application. For example, eighteen, twenty, thirty-five, thirty-seven, or other numbers of second oil inlet channels 150 can be set, which can be selected according to the actual application.

[0065] refer to Figure 3 and combined Figure 6 , Figure 6 An exemplary perspective view of the third core portion 123 and the fourth core portion 124 is shown.

[0066] The third core section 123 has twelve oil passages 160 inside. Exemplarily, each oil passage 160 is an irregular rectangle. It can be seen that this irregular rectangle is a closed quadrilateral formed by two short straight lines and two long arcs, but the shape is not limited in this embodiment. The twelve oil passages 160 are arranged circumferentially (e.g., ...). Figure 6 The R-direction interval is shown in the figure. Exemplarily, the number of oil passages 160 in this application embodiment is not specifically limited. For example, eight, ten, twenty-one, or other numbers of oil passages 160 can be set, which can be selected according to the actual application.

[0067] The fourth iron core section 124 is provided with forty-eight oil spray sections 170. Exemplarily, each oil spray section 170 is circular, but the shape is not limited in this embodiment. The forty-eight oil spray sections 170 are also circumferentially (e.g., ...). Figure 7 The R-direction spacing is shown in the figure. Exemplarily, the number of fuel injection units 170 in this application embodiment is not specifically limited. For example, seventeen, eighteen, nineteen, thirty-five, or other numbers of fuel injection units 170 can be provided, which can be selected according to the actual application.

[0068] refer to Figure 2 and combined Figure 6 and Figure 7 It should be noted that, in order to facilitate the demonstration of the oil passages and the simulation of the flow of cooling oil, Figure 7 The inlet and outlet channels (fluid domains) are illustrated in physical form.

[0069] Taking the Z1 side as an example, the first oil inlet channel 140, the second oil inlet channel 150, the oil passage 160, and the oil injection section 170 on the Z2 side are arranged symmetrically with those on the Z1 side.

[0070] Along the axial direction (e.g.) Figure 7 (shown in the Z direction), one end of each oil passage 160 (i.e. Figure 7 The end indicated by the Z2 direction corresponds to and connects to three second oil inlet channels 150, and the other end of each oil passage 160 (i.e. Figure 1B The end pointed to in the Z1 direction corresponds to and connects to the three fuel injection sections 170.

[0071] For example, an external oil pump can be used to pump cooling oil into the interior of the housing 110 (as shown in Figure 2 The cooling oil flows along the annular channel 141 of the first oil inlet channel 140 (as shown by the circumferential arrow in Figure 7 and Figure 2 ). During the flow along the annular channel 141, a portion of the cooling oil flows into the axially extending oil inlet branch 142 (as shown by the double arrow in Figure 7 and Figure 2 ), and then flows along the oil inlet branch 142 into the forty-eight second oil inlet channels 150 of the second core portion 122, and then flows into the twelve oil passing channels 160 of the third core portion 123, and then mixes in the twelve oil passing channels 160, and then further flows to the forty-eight oil injection portions 170, and then is directly injected by the forty-eight oil injection portions 170 to the winding 130 (as shown in Figures 4 to 7 ).

[0072] With reference to Figure 8 , by using the above technical solutions, the oil-cooled motor of the embodiment of the present application uses four different types of cores (i.e., the first core portion 121, the second core portion 122, the third core portion 123, and the fourth core portion 124), and different cooling channels (i.e., the first oil inlet channel 140, the second oil inlet channel 150, the oil passing channel 160, and the oil injection portion 170) are arranged in the four cores respectively for the external cooling oil to flow through, so that the effective cooling of the oil-cooled motor 100 can be achieved while maintaining a moderate flow resistance and balancing the oil temperature.

[0073] Specifically, the external cooling oil first enters the first oil inlet channel 140 of the first core portion 121, and then is divided into a plurality of second oil inlet channels 150 in the second core portion 122. Since each oil passing channel 160 of the third core portion 123 can communicate with and cover a plurality of second oil inlet channels 150, firstly, the cooling oil flowing out of, for example, three second oil inlet channels 150 can flow into the same oil passing channel 160 and mix in the oil passing channel 160 to ensure uniform oil mixing and reduce the possibility of vortex and turbulent flow of the oil flowing out of the second oil inlet channel 150, thereby reducing the flow resistance. Secondly, since each oil passing channel 160 can communicate with a plurality of second oil inlet channels 150, it also means that the size of each oil passing channel 160 is relatively large, which can further reduce the flow resistance and effectively alleviate the pumping pressure of the external oil pump (not shown in the figure).

[0074] Therefore, the cooling channels (i.e., the first oil inlet channel 140, the second oil inlet channel 150, the oil passing channel 160, and the oil injection part 170) in the oil-cooled motor of the embodiment of the present application effectively reduce the flow resistance of the cooling oil and the pumping pressure of the external oil pump, so as to be able to alleviate the phenomenon of uneven oil temperature and avoid affecting the performance of the motor; at the same time, the pumping conditions (such as high pressure, high flow, etc.) of the external oil pump are also effectively reduced, and the design cost and manufacturing cost of the motor system are reduced.

[0075] In addition, compared with the traditional cooling scheme, the oil-cooled motor of the embodiment of the present application does not need to be configured with an extra cooling structure (such as a plastic part, not shown in the figure), and can achieve effective cooling, thereby saving material cost, assembly cost and process cost, and also reducing the failure risk of assembly between the oil-cooled motor and the traditional plastic part.

[0076] The structure of the first core part 121, the second core part 122, the third core part 123, and the second core part 124 will be described in detail below.

[0077] Reference Figure 4 and in combination Figure 8 Each of the first core parts 121 described above includes a plurality of first core punching sheets 1211. Figure 4 An elevational view of the first core punching sheet 1211 is exemplarily shown.

[0078] In a possible implementation, the plurality of first core punching sheets 1211 are arranged in a stacked manner along an axial direction (such as the Z direction shown in the figure) so as to form each of the first core parts 121 described above. Figure 8

[0079] Exemplarily, the number of the first core punching sheets 1211 arranged in a stacked manner in each of the first core parts 121 is not limited in the embodiment of the present application and can be specifically arranged according to actual conditions. For example, the number of the first core punching sheets 1211 arranged in a stacked manner in each of the first core parts 121 can be the same. Or, the number of the first core punching sheets 1211 arranged in a stacked manner in each of the first core parts 121 can also be different. Or, the number of the first core punching sheets 1211 arranged in a stacked manner in any two of the first core parts 121 can also be different.

[0080] Specifically, as shown in the figure, each of the first core punching sheets 1211 is provided with a plurality of tabs 181 at intervals along a circumferential direction (such as the R direction shown in the figure). Figure 8 Figure 4 When the plurality of first core punching sheets 1211 are stacked along the axial direction, the corresponding plurality of tabs 181 also form a plurality of protrusions 180 (such as shown in the figure) along the axial direction. Figure 4

[0081] ​​​That is, the plurality of first core punching sheets 1211 are stacked along the axial direction (Z direction as shown in Figure 1B FIG. 1) to form one first core part 121, and correspondingly, the plurality of tabs 181 on the plurality of first core punching sheets 1211 can be stacked along the axial direction to form a plurality of corresponding protrusions 180.

[0082] Exemplarily, the number and thickness of the tabs 181 are configured to enable the protrusions 180 formed by the stacking to be sealingly connected with the shell 110 (as shown in Figure 9 FIG. 1), but are not limited thereto, and the number and thickness of the tabs 181 are not specifically limited in the embodiments of the present application, and can be selected according to actual application.

[0083] Referring to Figure 5 and in combination with Figure 9 , each of the second core parts 122 described above includes a plurality of second core punching sheets 1221. Figure 5 Exemplarily, a front view of the second core punching sheet 1221 is shown.

[0084] In one possible implementation, the plurality of second core punching sheets 1221 are arranged and stacked along the axial direction (Z direction as shown in Figure 9 FIG. 1) to form each of the second core parts 122 described above.

[0085] Exemplarily, the number of the second core punching sheets 1221 arranged and stacked in each of the second core parts 122 is not limited in the embodiments of the present application, and can be specifically arranged according to actual situation. For example, the number of the second core punching sheets 1221 arranged and stacked in each of the second core parts 122 can be the same. Or, the number of the second core punching sheets 1221 arranged and stacked in each of the second core parts 122 can also be different. Or, the number of the second core punching sheets 1221 arranged and stacked in any two of the second core parts 122 can also be different.

[0086] Specifically, as shown in Figure 9 , each of the second core punching sheets 1221 is provided with forty-eight oil inlet holes 151 at intervals along the circumferential direction (R direction as shown in Figure 5 FIG. 1), and in combination with the foregoing, the number of the oil inlet holes 151 is not specifically limited in the embodiments of the present application. Exemplarily, each of the oil inlet holes 151 is rectangular, but is not limited thereto. Exemplarily, each of the oil inlet holes 151 does not penetrate the outer periphery of the corresponding second core punching sheet 1221.

[0087] When the plurality of second core punching sheets 1221 are stacked along the axial direction, the corresponding oil inlet holes 151 also form forty-eight second oil inlet channels 150 (as shown in Figure 10 FIG. 1) along the axial direction.

[0088] Further in combination with Figure 10 ,Figure 5 A partially enlarged view of the second core section 122 is shown.

[0089] That is, when multiple second core laminations 1221 are along the axial direction (such as...) Figure 11 When stacked (in the Z direction shown), a second iron core portion 122 can be formed. Correspondingly, the oil inlet holes 151 on the plurality of second iron core laminations 1221 can be stacked axially to form forty-eight corresponding second oil inlet channels 150.

[0090] refer to Figure 6 and combined Figure 11 Each of the aforementioned third core portions 123 includes a plurality of third core laminations 1231. Figure 6 An exemplary front view of the third core lamination 1231 is shown.

[0091] In one possible implementation, at least one third core lamination 1231 is axially (e.g.) Figure 11 The stacking arrangement (shown in the Z direction) enables the formation of each of the aforementioned third core portions 123. That is, the third core portion 123 may include only one third core lamination 1231, or it may include multiple third core laminations 1231.

[0092] By way of example, the number of third core laminations 1231 stacked in each third core section 123 is not limited in the embodiments of this application, and can be specifically set according to the actual situation. For example, the number of third core laminations 1231 stacked in each third core section 123 may be the same. Alternatively, the number of third core laminations 1231 stacked in each third core section 123 may be different. Alternatively, the number of third core laminations 1231 stacked in any two third core sections 123 may be different.

[0093] Specifically, such as Figure 11 As shown, each third core lamination 1231 is circumferentially (e.g., Figure 6 The embodiment shows twelve oil passage openings 161 spaced apart in the R direction. In conjunction with the foregoing, this application does not impose a specific limitation on the number of oil passage openings 161. Exemplarily, each oil passage opening 161 is a closed quadrilateral formed by straight lines and arcs, but is not limited thereto. Exemplarily, each oil passage opening 161 does not penetrate the outer periphery of the corresponding third core lamination 1231.

[0094] When multiple third core laminations 1231 are stacked axially, the corresponding oil passage openings 161 also form twelve oil passage channels 160 axially (e.g. Figure 6 (As shown).

[0095] In other words, when multiple third core laminations 1231 are along the axial direction (e.g.Figure 7 The third core portions 1231 can be formed by stacking the third core punching sheets 1231 along the axial direction (Z direction shown in the figure), and the oil passing holes 161 on the third core punching sheets 1231 can be stacked along the axial direction to form twelve corresponding oil passing channels 160.

[0096] Further, referring to Figure 7 It can be seen that each oil passing channel 160 can cover three second oil inlet channels 150 along the axial direction (Z direction shown in the figure), i.e., the projection size of each oil passing channel 160 along the axial direction is greater than the size of each second oil inlet channel 150. Figure 11 That is, as to the twelve oil passing holes 161 on the third core punching sheet 1231, the projection size of each oil passing hole 161 along the axial direction is greater than the axial projection size of each oil inlet hole 151. Figure 12

[0097] Exemplarily, only one third core punching sheet 1231 can be selected to form a third core portion 123 alone, and only one third core portion 123 can be selected to be connected with the second core portion 122, at this time, the one third core portion 123 can be used to flow the cooling oil flowed out of the three second oil inlet channels 150, and the oil mixing can be performed in the twelve oil passing channels 160 of the third core portion 123 to increase the flow area and reduce the flow resistance, and only one third core punching sheet 1231 can be used to reduce the magnetic leakage and ensure the electromagnetic efficiency of the oil-cooled motor.

[0098] Referring to Figure 6 and combining Figure 12 Each fourth core portion 124 can include a plurality of fourth core punching sheets 1241. Figure 6 Exemplarily, a front view of the fourth core punching sheet 1241 is shown.

[0099] In a possible implementation, at least one fourth core punching sheet 1241 can be arranged in a stacked manner along the axial direction (Z direction shown in the figure) to form each fourth core portion 124. Figure 12 That is, the fourth core portion 124 can include only one fourth core punching sheet 1241, or can include a plurality of fourth core punching sheets 1241.

[0100] ​Exemplarily, the number of the fourth core punching sheets 1241 stacked in each fourth core part 124 is not limited, and can be set according to actual conditions. For example, the number of the fourth core punching sheets 1241 stacked in each fourth core part 124 can be the same. Or, the number of the fourth core punching sheets 1241 stacked in each fourth core part 124 can be different. Or, the number of the fourth core punching sheets 1241 stacked in any two fourth core parts 124 can be different.

[0101] Specifically, as shown in Figure 12 , each fourth core punching sheet 1241 is provided with forty-eight oil injection holes 171 at intervals in the circumferential direction (e.g., the R direction shown in Figure 6 ). In combination with the foregoing, the number of the oil injection holes 171 is not limited in the embodiment of the application. Exemplarily, each oil injection hole 171 is a circular hole, but is not limited thereto.

[0102] When the plurality of fourth core punching sheets 1241 are stacked in the axial direction, the corresponding oil injection holes 171 also form forty-eight oil injection parts 170 (as shown in Figure 13 ) in the axial direction.

[0103] Further in combination with Figure 13 , Figure 6 , a partial enlarged view of the fourth core part 124 is shown.

[0104] That is, when the plurality of fourth core punching sheets 1241 are stacked in the axial direction (e.g., the Z direction shown in Figure 6 ), a fourth core part 124 can be formed, and correspondingly, the oil injection holes 171 on the plurality of fourth core punching sheets 1241 can be stacked in the axial direction to form forty-eight corresponding oil injection parts 170.

[0105] As shown in Figure 6 , it can be seen that each oil passing channel 160 of the above-mentioned third core part 123 can cover three oil injection parts 170 in the axial direction (e.g., the Z direction shown in Figure 9 ), that is, the projection size of each oil passing channel 160 in the axial direction is greater than the size of each oil injection part 170.

[0106] Exemplarily, referring to Figure 12 and ​ , in the axial direction, the forty-eight oil injection holes 171 of the fourth core punching sheet 1241 can correspond to the forty-eight oil injection holes 171 of the corresponding fourth core punching sheet 1241 one by one, but can also not correspond, which can be selected according to actual application requirements.

[0107] Although the utility model has been illustrated and described by referring to certain preferred embodiments of the utility model, it should be understood by those skilled in the art that the above content is the further detailed description of the utility model combined with the specific embodiments, and the specific implementation of the utility model cannot be limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple inferences or replacements, without departing from the spirit and scope of the utility model.

Claims

1. An oil-cooled electric machine characterized by, The application relates to a shell, a stator core sealed in the interior of the shell, the stator core comprising a first core part, an outer surface of the first core part and an inner wall of the shell jointly defining a first oil inlet channel, a second core part, a plurality of second oil inlet channels being arranged in the interior of the second core part and spaced apart along a circumferential direction, each of the second oil inlet channels being in communication with the first oil inlet channel, a third core part, a plurality of oil passing channels being arranged in the interior of the third core part and spaced apart along the circumferential direction, each of the oil passing channels being in communication with a plurality of the second oil inlet channels, and a fourth core part, a plurality of oil injection parts being arranged in the fourth core part and spaced apart along an axial direction, each of the oil passing channels being in communication with a plurality of the oil injection parts. The second core part comprises a plurality of second core laminations stacked along the axial direction, each of the second core laminations being provided with a plurality of oil inlet holes spaced apart along the circumferential direction, and the plurality of oil inlet holes of the second core laminations being stacked along the axial direction to form the plurality of second oil inlet channels. The third core part comprises one third core lamination or a plurality of third core laminations stacked along the axial direction, each of the third core laminations being provided with a plurality of oil passing openings spaced apart along the circumferential direction, the plurality of oil passing openings of the one third core lamination forming the plurality of oil passing channels, or the plurality of oil passing openings of the third core laminations being stacked along the axial direction to form the plurality of oil passing channels, and each of the oil passing openings being projected to cover a plurality of the oil inlet holes along the axial direction. Each of the oil inlet holes does not penetrate an outer periphery of the corresponding second core lamination. Each of the oil passing openings does not penetrate an outer periphery of the corresponding third core lamination. Each of the oil inlet holes is in a rectangular shape, and each of the oil passing openings is in an irregular rectangular shape. The first core part comprises a plurality of first core parts, each of the first core parts being provided with a plurality of protrusions, the first core parts being stacked along the axial direction, and the protrusions being staggered and attached to the inner wall of the shell to define the first oil inlet channel between the protrusions of the adjacent first core parts. Each of the first core parts comprises a plurality of first core laminations stacked along the axial direction, each of the first core laminations being provided with a plurality of tabs spaced apart along the circumferential direction, and the tabs of the first core laminations being stacked along the axial direction to form the protrusions.

2. The oil-cooled electric machine of claim 1, wherein, ​ 3. The oil-cooled electric machine of claim 2, wherein, ​ 4. The oil-cooled electric machine of claim 2, wherein, ​ 5. The oil-cooled electric machine of claim 3, wherein, ​ 6. The oil-cooled electric machine of claim 3, wherein, ​ 7. The electric machine of claim 1, wherein, ​ 8. The oil-cooled electric machine of claim 7, wherein, ​ 9. The oil-cooled electric machine of claim 1, wherein, The fourth core part comprises one fourth core punching sheet or a plurality of fourth core punching sheets stacked along the axial direction, each of the fourth core punching sheets is provided with a plurality of oil injection holes which are arranged at intervals along the circumferential direction; the plurality of oil injection holes of the one fourth core punching sheet form the plurality of oil injection parts, or the plurality of oil injection parts are formed by stacking the plurality of fourth core punching sheets along the axial direction.

10. The oil-cooled electric machine of any one of claims 1 to 9, wherein, The first core part, the second core part, the third core part and the fourth core part each comprise a plurality of, Along the axial direction, a plurality of the first core parts are located in the middle of the stator core, and opposite sides of the plurality of the first core parts are sequentially provided with a plurality of the second core parts, a plurality of the third core parts and a plurality of the fourth core parts respectively.

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