Oil ring assembly and oil cooling motor

Abstract

The invention belongs to the technical field of oil-cooled motors, and discloses an oil ring assembly and an oil-cooled motor. The oil ring assembly comprises a first annular plate and a second annular plate, the first annular plate, the second annular plate and the stator core are configured to be coaxially connected in sequence, and the first annular plate, the stator core and the motor shell define an oil cavity on the outer wall of the second annular plate; an oil gathering groove is formed in the outer wall of the second annular plate, the oil gathering groove and an oil outlet channel of the stator iron core are arranged oppositely in the axial direction of the second annular plate, and the oil outlet channel is communicated with the oil cavity; oil separation protrusions are arranged in the oil gathering grooves, the oil separation protrusions extend in the axial direction of the second annular plate to divide the oil gathering grooves into a plurality of separated injection grooves, the sectional areas of the separated injection grooves are gradually reduced in the direction close to the axis of the second annular plate, and top spraying holes are formed in the bottoms of the separated injection grooves. The oil ring assembly can fully utilize the gravity and pressure of the cooling oil to spray and cool the winding, thereby improving the cooling effect of the internal winding, and guaranteeing the normal operation of the oil-cooled motor.

Description

Technical Field

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

[0002] Oil-cooled motors are widely used in new energy vehicles due to their high power density and high torque density, and have become a hot topic in today's automotive industry. In order to enhance the heat dissipation capacity of the motor and improve the motor performance, direct oil cooling has gradually become a common cooling method for oil-cooled motors. Commonly used oil-cooled motors mostly use the structure of the stator core outer circle oil outlet channel and the end oil ring to form an oil circuit. There are multiple spray holes distributed axially on the oil ring. The cooling oil flows from the oil outlet channel at the end of the stator core to the oil ring, and is sprayed onto the winding through the oil holes of the oil ring, thereby cooling the winding.

[0003] During the actual operation of the vehicle, the temperature of the cooling oil in the oil tank changes with the external environment and the driving conditions of the vehicle. When the temperature of the cooling oil is low, the viscosity of the oil increases and the fluidity becomes worse. Even at the highest spray hole on the oil ring where the spray oil column is most likely to be formed, the flow rate and flow velocity will be greatly reduced, resulting in the phenomenon of cooling oil hanging on the surface of the oil ring, which makes it impossible for the cooling oil to be sprayed onto the copper wire, thereby affecting the cooling effect. Summary of the invention

[0004] The object of the present invention is to provide an oil ring assembly and an oil-cooled motor, which can effectively spray-cool the internal winding of the stator core.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides an oil ring assembly, comprising a first annular plate and a second annular plate, wherein the first annular plate, the second annular plate and a stator core are configured to be coaxially connected in sequence, and the first annular plate, the stator core and a motor housing enclose an oil cavity on the outer wall of the second annular plate;

[0007] The outer wall of the second annular plate is provided with an oil collecting groove, and along the axial direction of the second annular plate, the oil collecting groove and the oil outlet channel of the stator core are arranged opposite to each other, and the oil outlet channel is communicated with the oil cavity;

[0008] An oil separation protrusion is arranged in the oil collecting groove, and the oil separation protrusion extends along the axial direction of the second annular plate to divide the oil collecting groove into a plurality of separation grooves. The cross-sectional area of ​​the separation groove gradually decreases along the direction close to the axis of the second annular plate, and a top spray hole is arranged at the bottom of the separation groove.

[0009] Preferably, the inner wall of the second annular plate forms an inward convex structure corresponding to the oil collecting groove, the top spray hole is connected to the top of the inward convex structure, and the distance between the top of the inward convex structure and the axis of the second annular plate is smaller than the inner diameter of the second annular plate.

[0010] Preferably, one oil separation protrusion is provided, and the oil separation protrusion is arranged at the middle position of the oil collecting groove.

[0011] Preferably, the height of the oil separation protrusion is not greater than the depth of the oil collecting groove.

[0012] Preferably, the top surface of the oil-separating protrusion is an arc-shaped surface, and the arc-shaped surface has the axis of the second annular plate as its axis.

[0013] Preferably, the outer wall of the second annular plate is further provided with an oil injection hole, and the oil injection hole is located outside the oil collecting groove.

[0014] Preferably, a plurality of the oil injection holes are provided, and the plurality of the oil injection holes are sequentially arranged along the circumferential direction on the second annular plate, and the diameters of the plurality of the oil injection holes gradually decrease in a direction away from the top injection hole.

[0015] Preferably, the flow area of ​​the top spray hole is larger than the flow area of ​​the oil spray hole.

[0016] Preferably, the top spray hole is in an elongated strip shape, and the length direction of the top spray hole is parallel to the axial direction of the second annular plate.

[0017] The oil-cooled motor comprises a stator core, a motor housing and the oil ring assembly. The first annular plate, the second annular plate and the stator core are coaxially connected in sequence and installed in the motor housing.

[0018] The beneficial effects of the present invention are:

[0019] In the oil ring assembly provided by the present invention, the first annular plate, the second annular plate and the stator core are coaxially connected in sequence. Since the first annular plate, the stator core and the motor housing enclose an oil cavity on the outer wall of the second annular plate, and the oil outlet channel of the stator core is connected to the oil cavity, the cooling oil circulating in the oil-cooled motor can flow into the oil cavity through the oil outlet channel, which is convenient for subsequent winding cooling. Since an oil collecting groove is provided on the outer wall of the second annular plate, and the oil collecting groove is arranged opposite to the oil outlet channel of the stator core, the cooling oil sprayed from the oil outlet channel can quickly enter the oil collecting groove through the oil cavity and accumulate in the oil collecting groove. The cooling oil accumulated in the oil collecting groove The cooling oil will form a certain oil pressure at the bottom of the oil gathering groove; since an oil dividing protrusion is provided in the oil gathering groove, the oil dividing protrusion extends along the axial direction of the second annular plate and divides the oil gathering groove into a plurality of dividing grooves, and the cross-sectional area of ​​the dividing groove gradually decreases in the direction close to the axis of the second annular plate. Therefore, the cooling oil entering the oil gathering groove will be separated by the oil dividing protrusion and flow quickly into the dividing groove. Finally, the cooling oil will form an oil column through the top spray hole at the bottom of the groove under the combined action of its own gravity and oil pressure and spray downward, avoiding the situation where the cooling oil hangs on the wall or adheres due to the small flow rate, thereby improving the cooling effect of the internal winding and ensuring the normal operation of the oil-cooled motor.

[0020] The oil-cooled motor provided by the present invention adopts the above-mentioned oil ring assembly, which can fully utilize the gravity and pressure of the cooling oil itself to spray and cool the winding, and can effectively overcome the problem of poor cooling oil spraying under low temperature conditions, thereby ensuring the normal operation of the oil-cooled motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is an assembly diagram of a stator core and an oil ring assembly provided in a specific embodiment of the present invention;

[0022] Figure 2 is a structural schematic diagram of an oil ring assembly provided in a specific embodiment of the present invention;

[0023] Figure 3 It is a front view of an oil ring assembly provided in a specific embodiment of the present invention.

[0024] In the figure:

[0025] 100-stator core; 110-oil outlet channel;

[0026] 1- first annular plate;

[0027] 2-second annular plate; 21-oil collecting groove; 211-oil dividing protrusion; 212-top spray hole; 213-dividing groove; 22-oil spray hole. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0031] In the description of this embodiment, the terms "upper", "lower", "right", "left" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0032] like Figures 1 to 3As shown, the present invention provides an oil ring assembly, which includes a first annular plate 1 and a second annular plate 2. The first annular plate 1, the second annular plate 2 and the stator core 100 are configured to be coaxially connected in sequence, and the first annular plate 1, the stator core 100 and the motor housing are surrounded by the outer wall of the second annular plate 2 to form an oil cavity; the outer wall of the second annular plate 2 is provided with an oil collecting groove 21, along the axial direction of the second annular plate 2, the oil collecting groove 21 and the oil outlet channel 110 of the stator core 100 are arranged opposite to each other, and the oil outlet channel 110 is connected with the oil cavity; an oil separation protrusion 211 is provided in the oil collecting groove 21, and the oil separation protrusion 211 extends along the axial direction of the second annular plate 2 to separate the oil collecting groove 21 into a plurality of injection grooves 213, and the cross-sectional area of ​​the injection groove 213 gradually decreases along the direction close to the axis of the second annular plate 2, and the bottom of the injection groove 213 is provided with a top spray hole 212. In this embodiment, the first annular plate 1, the second annular plate 2 and the stator core 100 are coaxially connected in sequence. Since the first annular plate 1, the stator core 100 and the motor housing enclose an oil cavity on the outer wall of the second annular plate 2, and the oil outlet channel 110 of the stator core 100 is connected to the oil cavity, the cooling oil circulating in the oil-cooled motor can flow into the oil cavity through the oil outlet channel 110, which is convenient for subsequent winding cooling. Since the outer wall of the second annular plate 2 is provided with an oil collecting groove 21, the oil collecting groove 21 is arranged opposite to the oil outlet channel 110 of the stator core 100, the cooling oil sprayed from the oil outlet channel 110 will quickly enter the oil collecting groove 21 through the oil cavity and accumulate in the oil collecting groove 21. The cooling oil in the oil collecting groove 21 will form a certain oil pressure at the bottom of the oil collecting groove 21; since an oil dividing protrusion 211 is provided in the oil collecting groove 21, the oil dividing protrusion 211 extends along the axial direction of the second annular plate 2 and divides the oil collecting groove 21 into a plurality of dividing grooves 213, and the cross-sectional area of ​​the dividing groove 213 gradually decreases along the direction close to the axis of the second annular plate 2. Therefore, the cooling oil entering the oil collecting groove 21 will be separated by the oil dividing protrusion 211 and flow quickly into the dividing groove 213. Finally, the cooling oil will form an oil column through the top spray hole at the bottom of the groove under the combined action of its own gravity and oil pressure and spray downward, avoiding the situation where the cooling oil hangs on the wall or adheres due to the small flow rate, thereby improving the cooling effect of the internal winding and ensuring the normal operation of the oil-cooled motor.Specifically, the second annular plate 2 is provided with an axial end of the stator core 100, the first annular plate 1 is vertically connected to the axial end of the second annular plate 2, and the first annular plate 1 and the second annular plate 2 are integrally formed; the cooling oil circulating in the oil-cooled motor flows into the oil cavity through the oil outlet channel 110 of the stator core 100, and flows into the oil collecting groove 21; the oil collecting groove 21 is divided into a plurality of V-shaped distribution grooves 213 with a cross-section by the oil dividing protrusion 211, and the top spray hole 212 is opened at the bottom of the distribution groove 213 to ensure that the cooling oil flowing into the oil collecting groove 21 can enter the distribution groove 213 and completely flow out through the top spray hole 212, so as to avoid the cooling oil from being retained and accumulated in the distribution groove 213; and the cooling oil flowing into the distribution groove 213 can be sprayed downward in the form of an oil column under the action of its own gravity and oil pressure.

[0033] Furthermore, if Figure 2 and Figure 3 As shown, the inner wall of the second annular plate 2 forms an inner convex structure corresponding to the oil collecting groove, and the top spray hole 212 is connected to the top of the inner convex structure, and the distance between the top of the inner convex structure and the axis of the second annular plate 2 is smaller than the inner diameter of the second annular plate 2. In this embodiment, the oil collecting groove 21 forms an inner convex structure facing the axis on the inner wall of the second annular plate 2, and the distance between the top of the inner convex structure and the axis of the second annular plate 2 is smaller than the inner diameter of the second annular plate 2, that is, the top spray hole 212 is closer to the axis of the second annular plate 2 than the inner wall of the second annular plate 2, so the cooling oil in the oil collecting groove 21 can be sprayed onto the internal winding more accurately and powerfully.

[0034] Furthermore, if Figure 2 and Figure 3 As shown, one oil separation protrusion 211 is provided, and the oil separation protrusion 211 is provided at the middle position of the oil collecting groove 21. In this embodiment, the side walls on both sides of the oil collecting groove 21 gradually approach each other in the direction close to the axis of the second annular plate 2, thereby forming a tapered groove structure, and the oil separation protrusion 211 is provided at the middle position of the groove bottom of the oil collecting groove 21, and the oil separation protrusion 211 divides the oil collecting groove 21 into two injection grooves 213, so that the cooling oil in the oil collecting groove 213 is evenly dispersed and sprayed, thereby increasing the spraying area for the internal winding.

[0035] Specifically, the height of the oil separation protrusion 211 is not greater than the depth of the oil collecting groove 21. In this embodiment, the height of the oil separation protrusion 211 is not greater than the depth of the oil collecting groove 21, that is, the top of the oil separation protrusion 211 does not protrude from the outer wall surface of the second annular plate 2, so as to ensure that the cooling oil sprayed from the oil outlet channel 110 can flow freely and stably into the oil cavity.

[0036] Furthermore, the top surface of the oil separation protrusion 211 is an arc surface, and the arc surface takes the axis of the second annular plate 2 as its axis. In this embodiment, the arc-shaped top surface enables the cooling oil to always flow downward into the dispensing groove 213, preventing the cooling oil from adhering to the top surface of the oil separation protrusion 211; in another embodiment, the cross section of the oil separation protrusion 211 is a triangle, and its two side surfaces and the side wall of the oil collecting groove 21 form two dispensing grooves 213, ensuring that the cooling oil flows quickly and completely into the dispensing groove 213 along the side surface of the oil separation protrusion 211, and avoiding stagnation and accumulation at the top of the oil separation protrusion 211.

[0037] Furthermore, if Figure 1 and Figure 2 As shown, the outer wall of the second annular plate 2 is further provided with an oil injection hole 22, and the oil injection hole 22 is located outside the oil collecting groove 21. In this embodiment, the oil injection hole 22 penetrates the inner wall of the second annular plate 2 inwardly. Since the oil injection hole 22 is provided on the outer wall of the second annular plate 2, the cooling oil in the oil cavity can flow into the oil injection hole 22, thereby cooperating with the top injection hole 212 to realize the cooling of the copper wire at the end of the winding in the oil ring assembly, further improving the cooling effect.

[0038] Specifically, Figure 1 and Figure 2 As shown, a plurality of oil spray holes 22 are provided, and the plurality of oil spray holes 22 are sequentially arranged along the circumferential direction on the second annular plate 2, and the diameters of the plurality of oil spray holes 22 gradually decrease along the direction away from the top spray hole 212. In this embodiment, a plurality of oil spray holes 22 are provided, and the plurality of oil spray holes 22 are evenly spaced and arranged on the second annular plate 2 outside the oil collecting groove 21, and effective cooling is achieved at all parts of the winding; specifically, along the direction away from the top spray hole 212, the oil spray hole 22 gradually changes from a position above the winding to a position below the winding, and the greater the gravity that needs to be overcome by the cooling oil column sprayed from the oil spray hole 22, and the diameter of the oil spray hole 22 is reduced along the direction away from the top spray hole 212, according to the Bernoulli effect, the flow rate and pressure of the cooling oil sprayed from the oil spray hole 22 can be increased, thereby promoting the formation of a spray oil column from bottom to top, so as to effectively cool the winding.

[0039] Specifically, the flow area of ​​the top spray hole 212 is larger than the flow area of ​​the oil spray hole 22. In this embodiment, the flow area of ​​the top spray hole 212 is larger than the flow area of ​​the oil spray hole 22, so that the cooling oil can be sprayed onto the internal winding through the top spray hole 212 with the largest injection pressure to the greatest extent, thereby maximizing the cooling effect on the winding.

[0040] Furthermore, if Figure 2As shown, the top spray hole 212 is in the shape of an elongated strip, and the length direction of the top spray hole 212 is parallel to the axial direction of the second annular plate 2. In this embodiment, the top spray hole 212 is in the shape of an elongated strip, and its length direction is parallel to the axial direction of the second annular plate 2, and does not occupy the side wall of the dispensing groove 213, thereby increasing the flow area of ​​the top spray hole 212 while ensuring that there is always a large oil pressure at the top spray hole 212.

[0041] This embodiment also provides an oil-cooled motor, which includes a stator core 100, a motor housing, and the above-mentioned oil ring assembly, wherein the first annular plate 1, the second annular plate 2 and the stator core 100 are coaxially connected in sequence and installed in the motor housing. In this embodiment, the outer peripheral surface of the first annular plate 1 is in contact with the motor housing, so that an oil cavity is formed between the motor housing, the outer wall of the second annular plate 2, the stator core 100 and the first annular plate 1, and the cooling oil sprayed from the oil outlet channel 110 of the stator core 100 will enter the oil cavity, and then sprayed to the internal winding through the oil spray hole 22 of the top spray hole 212 arranged on the second annular plate 2 for cooling. The oil-cooled motor can make full use of the gravity and pressure of the cooling oil itself to spray and cool the winding, avoiding the situation where the cooling oil hangs on the wall or adheres due to a small flow rate, thereby improving the cooling effect of the internal winding and ensuring the normal operation of the oil-cooled motor.

[0042] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Oil ring assembly, characterized in that: The motor comprises a first annular plate (1) and a second annular plate (2), wherein the first annular plate (1), the second annular plate (2) and a stator core (100) are configured to be coaxially connected in sequence, and the first annular plate (1), the stator core (100) and a motor housing enclose an oil chamber on an outer wall of the second annular plate (2); The outer wall of the second annular plate (2) is provided with an oil collecting groove (21), and along the axial direction of the second annular plate (2), the oil collecting groove (21) and the oil outlet channel (110) of the stator core (100) are arranged opposite to each other, and the oil outlet channel (110) is communicated with the oil cavity; An oil separation protrusion (211) is arranged in the oil collecting groove (21), and the oil separation protrusion (211) extends along the axial direction of the second annular plate (2) to divide the oil collecting groove (21) into a plurality of separation grooves (213). The cross-sectional area of ​​the separation grooves (213) gradually decreases along the direction close to the axis of the second annular plate (2), and a top spray hole (212) is arranged at the bottom of the separation groove (213).

2. The oil ring assembly according to claim 1, characterized in that: The inner wall of the second annular plate (2) forms an inner convex structure corresponding to the oil collecting groove (21), the top spray hole (212) is connected to the top of the inner convex structure, and the distance between the top of the inner convex structure and the axis of the second annular plate (2) is smaller than the inner diameter of the second annular plate (2).

3. The oil ring assembly according to claim 1, characterized in that: One oil separation protrusion (211) is provided, and the oil separation protrusion (211) is provided at a middle position of the oil collecting groove (21).

4. The oil ring assembly according to claim 3, characterized in that: The height of the oil separation protrusion (211) is not greater than the depth of the oil collecting groove (21).

5. The oil ring assembly according to claim 1, characterized in that: The top surface of the oil separation protrusion (211) is an arc-shaped surface, and the arc-shaped surface has the axis of the second annular plate (2) as its axis.

6. The oil ring assembly according to claim 1, characterized in that: The outer wall of the second annular plate (2) is also provided with an oil injection hole (22), and the oil injection hole (22) is located outside the oil collecting groove (21).

7. The oil ring assembly according to claim 6, characterized in that: A plurality of the oil injection holes (22) are provided, and the plurality of the oil injection holes (22) are sequentially arranged along the circumferential direction on the second annular plate (2), and the diameters of the plurality of the oil injection holes (22) gradually decrease in a direction away from the top injection hole (212).

8. The oil ring assembly according to claim 6, characterized in that: The flow area of ​​the top spray hole (212) is greater than the flow area of ​​the oil spray hole (22).

9. The oil ring assembly according to any one of claims 1 to 8, characterized in that: The top spray hole (212) is in the shape of an elongated strip, and the length direction of the top spray hole (212) is parallel to the axial direction of the second annular plate (2).

10. Oil-cooled motor, characterized in that: It comprises a stator core (100), a motor housing and an oil ring assembly according to any one of claims 1 to 9, wherein the first annular plate (1), the second annular plate (2) and the stator core (100) are coaxially connected in sequence and installed in the motor housing.

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