Oil ring assembly and oil cooling motor

Abstract

The utility model 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; top spraying holes are formed in the groove bottom of the oil gathering groove, and the sectional area of the oil gathering groove is gradually reduced in the direction close to the axis of the second annular plate. 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 utility model relates to the technical field of oil-cooled motors, in particular to an oil ring assembly and an oil-cooled motor. Background Art

[0002] Oil-cooled motors, due to their high power density and torque density, are widely used in new energy vehicles and have become a hot topic of research in the automotive industry. To enhance the motor's heat dissipation capacity and improve its performance, direct oil cooling has gradually become a common cooling method for oil-cooled motors. Commonly used oil-cooled motors often utilize an oil circuit composed of an oil outlet channel on the outer diameter of the stator core and an oil ring at the end. The oil ring is equipped with multiple spray holes distributed axially. Cooling oil flows from the oil outlet channel at the end of the stator core to the oil ring, where it is sprayed onto the windings through the oil holes in the oil ring, thereby cooling the windings.

[0003] During the actual operation of the vehicle, the temperature of the cooling oil in the oil tank changes with the external environment and vehicle driving conditions. 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 form, 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, resulting in the cooling oil being unable to spray onto the copper wire, thereby affecting the cooling effect. Utility Model Content

[0004] The purpose of the utility model 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 purpose, the present invention adopts the following technical solutions:

[0006] The utility model 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 the stator core are configured to be coaxially connected in sequence, and the first annular plate, the stator core and the motor housing enclose an oil cavity on the outer wall of the second annular plate;

[0007] An oil collecting groove is provided on the outer wall of the second annular plate. 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 each other, and the oil outlet channel is communicated with the oil cavity.

[0008] A top spray hole is provided at the bottom of the oil collecting groove, and the cross-sectional area of ​​the oil collecting groove gradually decreases along the direction approaching the axis of the second annular plate.

[0009] Preferably, an oil separation protrusion is provided in the oil collecting groove, and the oil separation protrusion extends axially along the second annular plate to divide the oil collecting groove into multiple separation grooves. Along the direction close to the axis of the second annular plate, the cross-sectional area of ​​the separation groove gradually decreases, and the top spray hole is provided at the bottom of the separation groove.

[0010] Preferably, there is one oil-separating protrusion, which is arranged in the middle of the oil-collecting groove, and the height of the oil-separating protrusion is not greater than the depth of the oil-collecting groove.

[0011] 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.

[0012] Preferably, the inner wall of the second annular plate forms a bulge corresponding to the oil collecting groove, the top spray hole is connected to the top of the bulge, and the distance between the top of the bulge and the axis of the second annular plate is smaller than the inner diameter of the second annular plate.

[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 oil injection holes are sequentially arranged along the circumferential direction on the second annular plate, and the diameters of the plurality of 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] The oil ring assembly provided by the utility model comprises a first annular plate, a second annular plate and a stator core which 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, the oil outlet channel of the stator core is connected to the oil cavity. Therefore, 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 cooling of the winding. 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 be quickly discharged through the oil cavity. The cooling oil quickly enters the oil collecting groove and accumulates in the oil collecting groove. The cooling oil accumulated in the oil collecting groove forms a certain oil pressure at the bottom of the oil collecting groove. Since the cross-sectional area of ​​the oil collecting groove gradually decreases in the direction close to the axis of the second annular plate, and the bottom of the oil collecting groove is provided with a top spray hole, the cooling oil entering the oil collecting groove will form an oil column through the top spray hole under the combined action of its own gravity and oil pressure and spray downward, thereby avoiding the cooling oil from hanging on the wall or adhering due to 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 utility model 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 windings, can effectively overcome the problem of poor cooling oil spraying under low temperature conditions, and ensure the normal operation of the oil-cooled motor. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is a structural diagram of the oil ring assembly provided by a specific embodiment of the utility model;

[0023] Figure 3 It is a front view of the oil ring assembly provided by a specific embodiment of the utility model.

[0024] In the picture:

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

[0026] 1-first annular plate;

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

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0029] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

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

[0031] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0032] like Figures 1 to 2As shown, the utility model 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. The first annular plate 1, the stator core 100 and the motor housing form an oil chamber on the 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, 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 each other, and the oil outlet channel 110 is connected to the oil chamber; the bottom of the oil collecting groove 21 is provided with a top spray hole 211, and the cross-sectional area of ​​the oil collecting groove 21 gradually decreases along the direction close to the axis of the second annular plate 2. 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, the oil outlet channel 110 of the stator core 100 is connected to the oil cavity. Therefore, 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 an oil collecting groove 21 is provided on the outer wall of the second annular plate 2, 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 pass through the oil cooling channel 110. The oil cavity quickly enters the oil collecting groove 21 and accumulates in the oil collecting groove 21. The cooling oil accumulated in the oil collecting groove 21 will form a certain oil pressure at the bottom of the oil collecting groove 21. Since the cross-sectional area of ​​the oil collecting groove 21 gradually decreases in the direction close to the axis of the second annular plate 2, and the bottom of the oil collecting groove 21 is provided with a top spray hole 211, the cooling oil entering the oil collecting groove 21 will form an oil column through the top spray hole 211 under the combined action of its own gravity and oil pressure and spray downward, thereby avoiding the cooling oil from hanging on the wall or adhering 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. 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 formed in one piece; 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, and the two side walls of the oil collecting groove 21 gradually approach each other in the direction close to the axis of the second annular plate 2, and the top spray hole 211 is opened at the bottom of the oil collecting groove 21 to ensure that the cooling oil flowing into the oil collecting groove 21 can completely flow out through the top spray hole 211, thereby avoiding the cooling oil from being retained and accumulated in the oil collecting groove 21.

[0033] Furthermore, if Figure 2 and Figure 3As shown, an oil separation protrusion 212 is provided in the oil collecting groove 21. The oil separation protrusion 212 extends axially along the second annular plate 2 and divides the oil collecting groove 21 into a plurality of diversion grooves 213. The cross-sectional area of ​​the diversion grooves 213 gradually decreases as it approaches the axis of the second annular plate 2. Top spray holes 211 are provided at the bottom of the diversion grooves 213. In this embodiment, the oil collecting groove 21 is provided with an oil separation protrusion 212. The oil separation protrusion 212 extends axially along the second annular plate 2 and divides the oil collecting groove 21 into a plurality of diversion grooves 213. The cross-sectional area of ​​the diversion grooves 213 gradually decreases as it approaches the axis of the second annular plate 2. Therefore, the cooling oil entering the oil collecting groove 21 is separated by the oil separation protrusion 212 and flows rapidly into the diversion grooves 213. As a result, the cooling oil forms an oil column and sprays downward through the top spray holes 211 at the bottom of the plurality of diversion grooves 213, thereby improving the spraying effect on the internal windings. Specifically, the oil collecting groove 21 is divided into a plurality of dispensing grooves 213 with V-shaped cross sections by the oil dispensing protrusions 212, and the top spray hole 211 is opened at the bottom of the dispensing groove 213 to ensure that the cooling oil flowing into the oil collecting groove 21 can enter the dispensing groove 213 and completely flow out through the top spray hole 211, thereby avoiding the cooling oil from being retained and accumulated in the dispensing groove 213; and the cooling oil flowing into the dispensing groove 213 can be sprayed downward in the form of an oil column under the action of its own gravity and oil pressure.

[0034] Specifically, if Figure 2 and Figure 3 As shown, one oil-dividing protrusion 212 is provided, located in the middle of the oil collecting groove 21, and the height of the oil-dividing protrusion 212 is no greater than the depth of the oil collecting groove 21. In this embodiment, the sidewalls of the oil collecting groove 21 gradually converge toward the axis of the second annular plate 2, thereby forming a tapering groove structure. An oil-dividing protrusion 212 is provided in the middle of the bottom of the oil collecting groove 21. The oil-dividing protrusion 212 divides the oil collecting groove 21 into two diversion grooves 213, thereby evenly distributing and spraying the cooling oil within the oil collecting grooves 213, increasing the spraying area for the internal windings and improving the cooling effect on the windings. The top of the oil-dividing protrusion 212 does not protrude beyond the outer wall of the second annular plate 2, ensuring that the cooling oil sprayed from the oil outlet channel 110 can flow freely and stably into the oil cavity.

[0035] Specifically, the top surface of the oil-dividing protrusion 212 is an arc-shaped surface, with the arc-shaped surface centered on the axis of the second annular plate 2. In this embodiment, the arc-shaped top surface allows the cooling oil to consistently flow downward into the diverter groove 213, preventing the cooling oil from adhering to the top surface of the oil-dividing protrusion 212. In another embodiment, the cross-section of the oil-dividing protrusion 212 is triangular, with its two side surfaces and the sidewalls of the oil-collecting groove 21 forming two diverter grooves 213. This ensures that the cooling oil flows quickly and completely along the sides of the oil-dividing protrusion 212 into the diverter groove 213, preventing it from stagnating and accumulating on the top of the oil-dividing protrusion 212.

[0036] Furthermore, if Figure 3 As shown, a protrusion is formed on the inner wall of the second annular plate 2 corresponding to the oil collecting groove 21. The top spray hole 211 is connected to the top of the protrusion. The distance between the top of the protrusion and the axis of the second annular plate 2 is less than the inner diameter of the second annular plate 2. In this embodiment, the oil collecting groove 21 is formed on the inner wall of the second annular plate 2 as a protrusion facing the axis. The distance between the top of the protrusion and the axis of the second annular plate 2 is less than the inner diameter of the second annular plate 2. In other words, the top spray hole 211 is closer to the axis of the second annular plate 2 than the inner wall of the second annular plate 2. As a result, the cooling oil in the oil collecting groove 21 can be sprayed more accurately and effectively onto the internal windings.

[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 spray hole 22, located outside the oil collecting groove 21. In this embodiment, the oil spray hole 22 extends inward through the inner wall of the second annular plate 2. Since the oil spray 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 spray hole 22 and then flow through the oil spray hole 22 to the internal winding. This, in conjunction with the top spray hole 212, cools the copper wire at the end of the winding within the oil ring assembly, further enhancing the cooling effect.

[0038] Specifically, if Figure 1 and Figure 2 As shown, multiple oil spray holes 22 are provided, and the multiple oil spray holes 22 are sequentially arranged along the circumferential direction on the second annular plate 2. The diameters of the multiple oil spray holes 22 gradually decrease as they move away from the top spray hole 211. In this embodiment, multiple oil spray holes 22 are provided, and the multiple oil spray holes 22 are evenly spaced on the second annular plate 2 outside the oil collecting groove 21 to ensure effective cooling of all parts of the winding. Specifically, as the oil spray holes 22 gradually shift from a position above the winding to a position below the winding as they move away from the top spray hole 211, the greater the gravity that the cooling oil column sprayed from the oil spray holes 22 must overcome. As the diameter of the oil spray holes 22 decreases as they move away from the top spray hole 211, the Bernoulli effect increases the flow rate and pressure of the cooling oil sprayed from the oil spray holes 22, thereby promoting the formation of an oil column sprayed from bottom to top, effectively cooling the winding.

[0039] Specifically, the flow area of ​​the top spray hole 211 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, thereby allowing the cooling oil to be sprayed onto the internal winding through the top spray hole 212 with the highest injection pressure to the greatest extent, thereby maximizing the cooling effect on the winding.

[0040] Furthermore, if Figure 1 and Figure 2As shown, the top spray hole 211 is elongated, with its length parallel to the axial direction of the second annular plate 2. In this embodiment, the top spray hole 211 is elongated, with its length parallel to the axial direction of the second annular plate 2, and does not occupy the sidewall of the dispensing groove 213. This increases the flow area of ​​the top spray hole 211 while ensuring a high oil pressure at the top spray hole 211.

[0041] This embodiment also provides an oil-cooled motor, comprising a stator core 100, a motor housing, and the aforementioned oil ring assembly. A first annular plate 1, a second annular plate 2, and the stator core 100 are coaxially connected in sequence and mounted within the motor housing. In this embodiment, the outer circumferential surface of the first annular plate 1 abuts the motor housing, thereby forming an oil chamber enclosed by the motor housing, the outer wall of the second annular plate 2, the stator core 100, and the first annular plate 1. Cooling oil ejected from the oil outlet channel 110 of the stator core 100 enters the oil chamber and is then sprayed through the oil spray holes 22 of the top spray holes 211 disposed on the second annular plate 2 onto the internal windings for cooling. This oil-cooled motor fully utilizes the cooling oil's own gravity and pressure to form an oil column that sprays and cools the windings, preventing the cooling oil from clinging to the wall or adhering to the windings due to low flow rate, thereby improving the cooling effect on the internal windings and ensuring the normal operation of the oil-cooled motor.

[0042] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection 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 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 enclose an oil chamber on the outer wall of the second annular plate (2); An oil collecting groove (21) is provided on the outer wall of the second annular plate (2), 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 each other, and the oil outlet channel (110) is communicated with the oil cavity; A top spray hole (211) is provided at the bottom of the oil collecting groove (21), and the cross-sectional area of ​​the oil collecting groove (21) gradually decreases in a direction approaching the axis of the second annular plate (2).

2. The oil ring assembly according to claim 1, characterized in that: An oil separation protrusion (212) is provided in the oil collecting groove (21), and the oil separation protrusion (212) extends axially along the second annular plate (2) to separate 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 the top spray hole (211) is provided at the bottom of the separation groove (213).

3. The oil ring assembly according to claim 2, characterized in that: One oil separation protrusion (212) is provided, and the oil separation protrusion (212) is provided at the middle position of the oil collecting groove (21), and the height of the oil separation protrusion (212) is not greater than the depth of the oil collecting groove (21).

4. The oil ring assembly according to claim 3, characterized in that: The top surface of the oil-dividing protrusion (212) is an arc-shaped surface, and the arc-shaped surface has the axis of the second annular plate (2) as its axis.

5. The oil ring assembly according to claim 1, characterized in that: The inner wall of the second annular plate (2) forms a bulge corresponding to the oil collecting groove (21), the top spray hole (211) is connected to the top of the bulge, and the distance between the top of the bulge and the axis of the second annular plate (2) is smaller than the inner diameter of the second annular plate (2).

6. The oil ring assembly according to claim 1, characterized in that The outer wall of the second annular plate (2) is further provided with an oil spray hole (22), and the oil spray 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 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 in a direction away from the top spray hole (211).

8. The oil ring assembly according to claim 6, characterized in that: The flow area of ​​the top spray hole (211) 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 (211) is in the shape of an elongated strip, and the length direction of the top spray hole (211) is parallel to the axial direction of the second annular plate (2).

10. Oil-cooled motor, characterized in that, The invention 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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