Oil-cooled motor and automobile

Abstract

The present invention discloses an oil-cooled motor and a vehicle. The oil-cooled motor includes an oil drum and a stator. The stator includes a stator pressure ring and a stator core. A first groove is provided on the surface of the stator core, and the stator pressure ring is connected to both ends of the first groove. A second groove is provided on the outer surface of the stator pressure ring, and the stator pressure ring is sleeved over the end of the stator, with the first and second grooves communicating. The oil drum includes an L-shaped oil drum wall and a shell. The L-shaped oil drum wall and the shell form an annular cavity. The stator is accommodated in the annular cavity, and the outer surface of the stator pressure ring is connected to the shell. The present invention can effectively solve the problem of localized excessive temperature of the stator due to uneven heat dissipation of oil cooling.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an oil-cooled motor and a car. Background Art

[0002] With the development of permanent magnet synchronous motors and the increase in power density, the motor has gradually evolved from water cooling to oil cooling, which mainly cools the heat generated by the stator electromagnetic wire. The treatment method is to cool the stator core, electromagnetic wire, and end winding as much as possible to take away the heat.

[0003] For example: Patent US20190006914A1 Electric drive unit cooling system and method, stator rotor shaft jet ring stator cooling ring first stator cooling channel second stator cooling channel stator first end surface stator second end surface oil hole side first oil storage space first end winding second oil storage space second end winding first middle area housing second middle area first jet ring jet hole second jet ring jet hole first pressurized jet second pressurized jet

[0004] A powertrain cooling system and method includes providing oil to a stator cooling ring through holes defined in a housing. The oil enters a stator cooling channel through the stator cooling ring, enters an oil reservoir and an oil injection ring at each end through the stator cooling channel, and cools the end windings through holes in the oil injection ring. The stator cooling ring and the oil injection ring at least partially surround the stator and the end windings.

[0005] Oil is sprayed onto the end windings from different angles through the holes in the injection ring. In particular, the middle ring seal on the injection ring can be used between the injection ring and the housing. The seal between the injection ring and the stator end can be compressed to form an interference fit between the injection ring and the housing or stator end, but it does not cool the stator evenly. Summary of the Invention

[0006] In order to solve the above problems, embodiments of the present invention provide an oil-cooled motor and a vehicle, which can effectively solve the problem of excessively high local temperature of the stator caused by uneven oil cooling.

[0007] An embodiment of the present invention provides an oil-cooled motor, comprising an oil barrel and a stator, the stator comprising a stator pressure ring and a stator iron core, a first groove being provided on the surface of the stator iron core, the stator pressure ring being connected to both ends of the first groove, a second groove being provided on the outer surface of the stator pressure ring, the stator pressure ring being sleeved on the end portion of the stator, the first groove being communicated with the second groove, the oil barrel comprising an L-shaped oil barrel wall and a shell, the L-shaped oil barrel wall and the shell forming an annular cavity, the stator being accommodated in the annular cavity, and the outer surface of the stator pressure ring being connected to the shell.

[0008] Furthermore, the oil-cooled motor also includes a stator oil barrel cover plate, which is an annular cover plate having an outer end surface and an inner end surface, the outer end surface being connected to the shell, and the inner end surface being connected to the L-shaped oil barrel wall.

[0009] Furthermore, the L-shaped oil barrel wall includes an oil barrel bottom surface and an oil barrel side surface, the oil barrel side surface is connected to the stator oil barrel cover plate, and the oil barrel side surface protrudes from the surface where the stator oil barrel cover plate is located.

[0010] Furthermore, the stator pressing ring is interference fit with the housing.

[0011] Furthermore, the housing is provided with a limiting groove, and the stator pressure ring is partially inserted into the limiting groove.

[0012] Furthermore, the housing is provided with an oil inlet and an oil outlet, the oil inlet is provided at one end of the stator core, and the oil outlet is provided at the other end of the stator core.

[0013] Furthermore, the stator further includes a stator welding rib, which is arranged in the first groove and connected to the stator pressure ring.

[0014] Furthermore, the oil-cooled motor further includes a sealing ring, the housing is provided with a sealing groove, and the sealing ring is provided in the sealing groove.

[0015] Furthermore, there is a gap between the housing and the stator core, and the gap is used to accommodate cooling oil.

[0016] An embodiment of the present invention further provides a car, comprising any of the above-described oil-cooled motors.

[0017] The implementation of the present invention has the following beneficial effects:

[0018] The oil-cooled motor of the present invention includes an oil barrel and a stator, the stator including a stator pressure ring and a stator core, the surface of the stator core is provided with a first groove, the stator pressure ring is connected to both ends of the first groove, the outer surface of the stator pressure ring is provided with a second groove, the stator pressure ring is sleeved on the end of the stator, the first groove is connected to the second groove, the oil barrel includes an L-shaped oil barrel wall and a shell, the L-shaped oil barrel wall and the shell form an annular cavity, the stator is accommodated in the annular cavity, the outer surface of the stator pressure ring is connected to the shell, the cooling oil enters the first groove connected to the second groove through the second groove, because the outer surface of the stator pressure ring is higher than the outer surface of the stator, and the outer surface of the stator pressure ring is connected to the shell, so the cooling oil will overflow after entering the first groove and be injected into the annular cavity formed by the L-shaped oil barrel wall and the shell. As a result, the stator surface of the oil-cooled motor will be placed in the cooling oil, thereby achieving uniform cooling of the stator and ensuring the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of a partial cross-sectional structure of an oil-cooled motor provided in one embodiment of the present invention.

[0021] Figure 2 A schematic diagram of the assembly structure of a stator core and a stator pressure ring provided in one embodiment of the present invention.

[0022] Figure 3 A schematic structural diagram of a stator pressure ring provided in one embodiment of the present invention.

[0023] Figure 4 A schematic diagram of the assembly structure of an L-shaped oil drum wall and a stator oil drum cover provided in one embodiment of the present invention.

[0024] Figure 5 This is a schematic cross-sectional structural diagram of a housing provided in one embodiment of the present invention.

[0025] Among them, the reference numerals in the figure correspond to: 1-shell, 11-oil outlet, 12-oil inlet, 13-stator oil barrel cover sealing groove 14-L-type oil barrel wall sealing groove, 2-stator, 21-stator electromagnetic wire, 22-stator iron core, 3-stator pressure ring, 31-second groove, 4-L-type oil barrel wall, 5-stator oil barrel sealing ring, 6-stator oil barrel cover, 7-stator welding rib. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. The features specified as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] Figure 1 A partial cross-sectional structural diagram of an oil-cooled motor provided in one embodiment of the present invention is shown in FIG. Figure 1 As shown, the oil-cooled motor includes an oil barrel and a stator 2, and the stator 2 includes a stator pressing ring 3 and a stator core 22. Figure 2 A schematic diagram of the assembly structure of the stator core and the stator pressure ring provided in one embodiment of the present invention is shown in FIG. Figure 2 As shown, a first groove is provided on the surface of the stator core 22, and the stator pressing ring 3 is connected to both ends of the first groove. Figure 3 A schematic structural diagram of a stator pressure ring according to an embodiment of the present invention is shown in FIG. Figure 3 As shown, the outer surface of the stator pressure ring 3 is provided with a second groove 31, and further reference is made to Figure 2 The stator pressing ring 3 is sleeved on the end of the stator 2, and the first groove is connected to the second groove 31, thereby forming a connected cooling oil channel.

[0030] In one embodiment of the invention, continue to refer to Figure 1The oil barrel includes an L-shaped oil barrel wall 4 and a shell 1. The L-shaped oil barrel wall 4 and the shell 1 form an annular cavity. The stator 2 is accommodated in the annular cavity. There is a gap between the outer edge of the stator 2 and the shell 1. The outer surface of the stator pressure ring 3 is connected to the shell 1. The cooling oil enters the first groove connected to the second groove 31 through the second groove 31. Since the outer surface of the stator pressure ring 3 is higher than the outer surface of the stator 2, and the outer surface of the stator pressure ring 3 is connected to the shell 1, the cooling oil will overflow after entering the first groove and be injected into the annular cavity formed by the L-shaped oil barrel wall 4 and the shell 1. As a result, the surface of the stator 2 of the oil-cooled motor will be placed in the cooling oil, thereby achieving uniform cooling of the stator 2 and ensuring the cooling effect.

[0031] Figure 4 Schematic diagram of the assembly structure of the L-shaped oil barrel wall and the stator oil barrel cover provided in one embodiment of the present invention. In one embodiment of the present invention, Figure 4 As shown, the oil-cooled motor also includes a stator oil barrel cover plate 6, which is an annular cover plate having an outer end face and an inner end face, and the inner end face is connected to the L-shaped oil barrel wall 4. During the assembly process, the stator 2 can be first sleeved on the L-shaped oil barrel wall 4, and then the annular cover plate can be assembled. Alternatively, a split stator 2 can be set. In this case, the L-shaped oil barrel wall 4 and the annular cover plate can be assembled, and then the split stator 2 can be assembled so that the L-shaped oil barrel wall 4 is sleeved in the inner cavity of the stator 2. The present invention does not limit the setting method of the stator 2. The outer end face of the stator oil barrel cover plate 6 is connected to the shell 1, thereby forming a closed cavity between the stator oil barrel cover plate 6, the shell 1 and the L-shaped oil barrel wall 4, and the stator 2 is located in the closed cavity.

[0032] In one embodiment of the invention, continue to refer to Figure 1 The L-shaped oil barrel wall 4 includes an oil barrel bottom and an oil barrel side. The oil barrel side is connected to the stator oil barrel cover 6. The oil barrel side protrudes from the surface where the stator oil barrel cover 6 is located, so as to play a directional role in the assembly process of the stator oil barrel cover 6, facilitate assembly, and at the same time improve the connection strength between the stator oil barrel cover 6 and the L-shaped oil barrel wall 4.

[0033] In one embodiment of the invention, the stator pressing ring 3 forms an interference fit with the housing 1, securing the stator 2 and stator pressing ring 3 assembly, facilitating the oil-cooling function of the motor. This ensures that cooling oil flowing through the surface of the stator 2 enters the annular cavity formed by the stator 2 and the housing 1 through the second groove 31. This facilitates control of the flow of cooling oil through the surface of the stator 2, ensuring effective cooling.

[0034] In one embodiment of the invention, the housing 1 is provided with a limiting groove, and the stator pressure ring 3 is partially inserted into the limiting groove, so that the fit between the stator pressure ring 3 and the housing 1 is more stable, thereby preventing the combination of the stator 2 and the stator pressure ring 3 from being displaced along the inner wall of the housing 1 under the fluid pressure of the cooling oil, thereby improving the functional stability of the oil-cooled motor.

[0035] Figure 5 A schematic cross-sectional view of a housing according to an embodiment of the present invention is provided. Figure 5 As shown, the housing 1 is provided with an oil inlet 12 and an oil outlet 11. The oil inlet 12 is provided at one end of the stator core 22, and the oil outlet 11 is provided at the other end of the stator core 22. The cooling oil enters one end of the closed annular cavity formed by the housing 1, the stator oil barrel cover 6, and the L-shaped oil barrel wall 4 through the oil inlet 12. The end of the stator 2 is immersed in the cooling oil to achieve uniform cooling. Furthermore, the cooling oil needs to enter the annular cavity formed by the stator 2 and the housing 1 through the second groove 31 on the stator pressure ring 3 near the end of the oil inlet 12, cooling the surface of the stator 2 located between the stator pressure ring 3. Subsequently, the cooling oil flows into the end of the annular cavity near the oil outlet 11 through the second groove 31 on the stator pressure ring 3 near the end of the oil outlet 11. This facilitates the control of the flow of cooling oil flowing through the surface of the stator 2, ensures the cooling effect, and improves the utilization efficiency of the cooling oil.

[0036] In one embodiment of the invention, continue to refer to Figure 2 The stator 2 further includes a stator welding rib 7 disposed within the first groove and connected to the stator pressing ring 3, thereby enhancing the stability of the connection between the stator pressing ring 3 and the stator 2. The stator 2 is formed by welding together a stator core 22, a stator welding rib 7, and a stator pressing ring 3, with stator electromagnetic wires 21 placed within the slots. The stator electromagnetic wires 21 are connected in a specific sequence.

[0037] In one embodiment of the invention, continue to refer to Figure 1 The oil-cooled motor also includes a sealing ring. The housing 1 is provided with a stator oil barrel cover sealing groove 13 and an L-shaped oil barrel wall sealing groove 14. The sealing ring includes a stator oil barrel sealing ring 5. The stator oil barrel sealing ring 5 is arranged in the stator oil barrel cover sealing groove 13. Correspondingly, the L-shaped oil barrel wall sealing groove 14 is also provided with a sealing ring matching the L-shaped oil barrel wall sealing groove 14, thereby improving the sealing performance of the oil-cooled motor.

[0038] In one embodiment of the invention, continue to refer to Figure 1There is a gap between the housing 1 and the stator core 22, and the gap is used to accommodate cooling oil, facilitating the circulation and heat exchange of the cooling oil.

[0039] An embodiment of the present invention further provides an automobile comprising any of the above-described oil-cooled motors. In one embodiment of the present invention, the automobile is equipped with a reduction gearbox, and the cooling oil in the oil-cooled motor is connected to the oil in the reduction gearbox, facilitating installation. The advantages of the oil-cooled motor are described above and will not be further elaborated here.

[0040] The stator 2 of the oil-cooled motor of the present invention is completely convenient for evenly cooling the stator 2 and taking away more heat. The right cooling path of the stator 2 is completely closed, and the effective flow rate can be controlled.

[0041] The above disclosures are merely some preferred embodiments of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An oil-cooled motor, characterized in that: The stator comprises an oil barrel and a stator, wherein the stator comprises a stator pressing ring and a stator core, a first groove is provided on the surface of the stator core, the stator pressing ring is connected to both ends of the first groove, a second groove is provided on the outer surface of the stator pressing ring, the stator pressing ring is sleeved on the end of the stator, and the first groove is connected to the second groove. The oil barrel comprises an L-shaped oil barrel wall and a shell, wherein the L-shaped oil barrel wall and the shell form an annular cavity, the stator is accommodated in the annular cavity, and the outer surface of the stator pressure ring is connected to the shell; The oil-cooled motor further includes a stator oil barrel cover plate, which is an annular cover plate having an outer end surface and an inner end surface, wherein the outer end surface is connected to the housing, and the inner end surface is connected to the L-shaped oil barrel wall; The housing is provided with an oil inlet and an oil outlet. The oil inlet is arranged at one end of the stator core, and the oil outlet is arranged at the other end of the stator core.

2. The oil-cooled motor according to claim 1, characterized in that: The L-shaped oil barrel wall includes an oil barrel bottom surface and an oil barrel side surface. The oil barrel side surface is connected to the stator oil barrel cover plate, and the oil barrel side surface protrudes from the surface where the stator oil barrel cover plate is located.

3. The oil-cooled motor according to claim 1, characterized in that: The stator pressing ring is interference fit with the housing.

4. The oil-cooled motor according to claim 1, characterized in that: The housing is provided with a limiting groove, and the stator pressure ring is partially clamped in the limiting groove.

5. The oil-cooled motor according to claim 1, characterized in that: The stator further includes a stator welding rib, which is arranged in the first groove and connected to the stator pressure ring.

6. The oil-cooled motor according to claim 1, characterized in that: The oil-cooled motor further includes a sealing ring, the housing is provided with a sealing groove, and the sealing ring is arranged in the sealing groove.

7. The oil-cooled motor according to claim 1, characterized in that: A gap is defined between the housing and the stator core, and the gap is used to accommodate cooling oil.

8. An automobile, characterized in that: It comprises the oil-cooled motor as described in any one of claims 1-7.

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