Oil path structure of extended-range motor rotor

Abstract

The utility model discloses an oil path structure of a range-extended motor rotor, which comprises a rotor hub connected with the output end of an engine crankshaft, and the peripheral side of the rotor hub is sequentially connected with a front balance plate, an iron core assembly, a rear balance plate and a locking ring. An oil groove I is formed in the inner wall of the rotor hub, the oil groove I is connected with an oil passing hole, and the oil passing hole penetrates through the side wall of the rotor hub; a second oil groove and a third oil groove are formed in the end face of one side of the rear balance plate, the third oil groove is of an annular groove structure, one end of the second oil groove is connected with the third oil groove, and the other end of the second oil groove is connected with the oil passing hole; the iron core assembly is provided with an oil passing channel, the front balance plate is provided with a first oil outlet hole, one end of the oil passing channel is connected with the third oil groove, and the other end of the oil passing channel is connected with the first oil outlet hole. According to the utility model, the installation mode of the extended range motor rotor and the engine is fully adapted, the rotor core is fully covered, heat is taken away, the normal working temperature of the rotor core and the magnetic steel is ensured, and the performance and reliability of the motor are improved.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, specifically to an oil circuit structure for a range extender motor rotor. Background Technology

[0002] In the design of range-extended hybrid vehicles, the limited space of the vehicle layout places higher demands on the power density of the range extender motor. Increased power density means achieving higher power output within a limited installation space, which poses a significant challenge to the motor's cooling system. Traditional air cooling or simple water cooling methods are insufficient to meet the demand for efficient heat dissipation when faced with the enormous heat generated by high-power-density motors.

[0003] Therefore, in order to meet the heat dissipation requirements of high power and high power density motors in range-extended hybrid vehicles, more efficient cooling solutions are needed. Oil cooling technology, as a novel cooling method, is gradually gaining attention and being applied to the field of motor cooling.

[0004] While some existing motors utilize oil cooling technology, the specific oil circuit structure design for range extender motor rotors remains inadequate. On one hand, the oil circuit design in some oil-cooling structures is not reasonable enough, resulting in uneven flow of cooling oil inside the rotor, failing to adequately cover all heat-generating parts and affecting the cooling effect. On the other hand, some designs fail to fully consider the installation method of the range extender motor and engine, leading to a complex oil circuit structure, increased parts, and higher manufacturing costs. Utility Model Content

[0005] The purpose of this invention is to address the problems existing in the prior art by providing an oil circuit structure for a range extender motor rotor that is fully compatible with the installation method of the range extender motor rotor and the engine, fully covers the rotor core, removes heat, ensures the normal operating temperature of the rotor core and magnets, and improves motor performance and reliability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An oil circuit structure for a range extender motor rotor includes a rotor hub connected to the output end of an engine crankshaft. A front balance plate, a core assembly, a rear balance plate, and a locking ring are sequentially connected to the outer periphery of the rotor hub. The inner wall of the rotor hub has an oil groove, which connects to an oil passage hole that penetrates the side wall of the rotor hub. One end face of the rear balance plate has two oil grooves, the third being an annular groove structure. One end of the second oil groove connects to the third oil groove, and the other end connects to the oil passage hole. The core assembly has an oil passage channel, and the front balance plate has an oil outlet hole, one end of which connects to the third oil groove, and the other end connects to the first oil outlet hole.

[0008] Furthermore, the locking ring is fixed to the end face of the rotor hub, the inner diameter of the locking ring is smaller than the end face diameter of the rotor hub, the first oil groove is an axially extending strip groove, one end of the first oil groove is connected to the inner side of the end face of the locking ring, and the other end is connected to the oil passage hole.

[0009] Furthermore, the inner diameter of the rotor hub gradually increases towards the locking ring, and the inner wall of the rotor hub is an inclined surface.

[0010] Furthermore, the core assembly includes several stacked magnetic steel sheets, each of which is provided with a cooling hole, and all the cooling holes are aligned to form the oil passage.

[0011] Furthermore, the outer periphery of the rotor hub is provided with an axially extending guide groove, and the inner holes of the front balance plate, the core assembly, and the rear balance plate are all provided with guide blocks that cooperate with the guide groove.

[0012] Furthermore, the outer peripheral wall of the rotor hub is provided with a limiting protrusion ring, and the locking ring presses the front balance plate, the iron core assembly and the rear balance plate against the limiting protrusion ring; the locking ring is fixed to the rotor hub by a threaded connection or an interference fit.

[0013] Furthermore, the inner wall of the rotor hub is provided with a plurality of circumferentially spaced oil grooves, each of the oil grooves being provided with an oil passage hole, and the rear balance plate is provided with a plurality of oil grooves connected to the oil passage holes one by one, and all the oil grooves are connected to the oil grooves.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] Cooling oil pipes introduce cooling oil into the inner wall of the rotor hub. Utilizing the centrifugal force when the rotor rotates, the cooling oil flows through a series of oil passages, including oil groove one, oil passage hole, oil groove two, oil groove three, oil passage channel, and oil outlet hole one, fully covering the rotor core, carrying away heat, ensuring the normal operating temperature of the rotor core and magnets, and improving motor performance and reliability.

[0016] An oil groove and an oil passage hole are provided on the inner wall of the rotor hub. The inner diameter of the locking ring is smaller than the diameter of the rotor hub end face, which forms an axial obstruction to the cooling oil on the inner wall of the rotor hub. Under the action of centrifugal force, the cooling oil first flows into the axially extended oil groove along the inner side of the locking ring end face, and then flows into the oil passage hole. This structural design is fully compatible with the installation method of the range extender motor rotor and the engine, and achieves rotor oil cooling without adding parts, simplifying the motor structure, reducing costs, and improving the reliability and stability of the motor.

[0017] Cooling oil flows into the inner wall of the rotor hub and sprays to cool the rotor hub as the rotor rotates, which helps to further improve the heat dissipation efficiency of the entire rotor, enhance the cooling effect on the rotor core and magnets, and make the motor cooling more comprehensive and efficient. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the motor rotor in one embodiment of this application;

[0020] Figure 2 This is a cross-sectional view of the motor rotor in one embodiment of this application;

[0021] Figure 3 This is an exploded structural diagram of the motor rotor in one embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the rotor hub structure in one embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the structure of the rear balance plate in one embodiment of this application;

[0024] Figure 6 This is a schematic diagram of the front balance plate in one embodiment of this application;

[0025] Figure 7 This is a schematic diagram of the structure of the magnet sheet in one embodiment of this application;

[0026] In the diagram: 1. Rotor hub; 11. Oil groove one; 12. Oil passage hole; 13. Guide groove; 14. Limiting protrusion ring; 2. Front balance plate; 21. Oil outlet hole one; 3. Iron core assembly; 31. Oil passage channel; 32. Magnet plate; 321. Cooling hole; 4. Rear balance plate; 41. Oil groove two; 42. Oil groove three; 5. Locking ring. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] While some existing motors utilize oil cooling technology, the specific oil circuit structure design for range extender motor rotors remains inadequate. On one hand, the oil circuit design in some oil-cooling structures is not reasonable enough, resulting in uneven flow of cooling oil inside the rotor, failing to adequately cover all heat-generating parts and affecting the cooling effect. On the other hand, some designs fail to fully consider the installation method of the range extender motor and engine, leading to a complex oil circuit structure, increased parts, and higher manufacturing costs.

[0032] To address the above technical issues, such as Figures 1 to 7As shown, this application embodiment provides an oil circuit structure for a range extender motor rotor, including a rotor hub 1 connected to the output end of the engine crankshaft. A front balance plate 2, an iron core assembly 3, a rear balance plate 4, and a locking ring 5 are sequentially connected to the outer periphery of the rotor hub 1. An oil groove 11 is provided on the inner wall of the rotor hub 1, and the oil groove 11 is connected to an oil passage hole 12, which penetrates the side wall of the rotor hub 1. An oil groove 41 and an oil groove 42 are provided on one side end face of the rear balance plate 4. The oil groove 42 is an annular groove structure. One end of the oil groove 41 is connected to the oil groove 42, and the other end is connected to the oil passage hole 12. An oil passage channel 31 is provided on the iron core assembly 3, and an oil outlet hole 21 is provided on the front balance plate 2. One end of the oil passage channel 31 is connected to the oil groove 42, and the other end is connected to the oil outlet hole 21.

[0033] Cooling oil is introduced into the inner wall of rotor hub 1 through cooling oil pipes. When the rotor rotates, due to centrifugal force, the cooling oil is collected by oil groove 11 on the inner wall of rotor hub 1. Oil groove 11 allows the cooling oil to be gathered during rotor rotation. The cooling oil collected in oil groove 11 passes through oil passage hole 12 through the side wall of rotor hub 1 and flows into oil groove 41 of rear balance plate 4. Oil passage hole 12 serves as a channel connecting oil groove 11 and oil groove 41, ensuring that the cooling oil can be smoothly transferred from inside rotor hub 1 to rear balance plate 4. The cooling oil in oil groove 41 then flows into oil groove 42. Oil groove 42 has an annular groove structure, which can evenly distribute the cooling oil, allowing the cooling oil to more comprehensively cover the iron core assembly 3. The cooling oil flowing out of oil groove 42 enters the oil passage 31 of iron core assembly 3. The oil passage 31 allows the cooling oil to flow inside iron core assembly 3, thereby achieving cooling of iron core assembly 3. After being cooled by the iron core assembly 3, the cooling oil flows out from the oil outlet 21 of the front balance plate 2, completing the entire flow process inside the rotor and realizing the cooling of the rotor iron core.

[0034] The cooling oil flows through a series of oil passages, including oil trough 11, oil passage hole 12, oil trough 2 41, oil trough 3 42, oil passage channel 31, and oil outlet hole 21, achieving comprehensive cooling of the rotor core. This oil passage structure removes heat through the flow of cooling oil, thereby ensuring the normal operating temperature of the rotor core and magnets, and improving the performance and reliability of the motor.

[0035] By providing an oil groove 11 on the inner wall of the rotor hub 1, and an oil passage hole 12 in the oil groove 11, the cooling oil is collected during rotor rotation due to centrifugal force, and then passes through the side wall of the rotor hub 1 via the oil passage hole 12. This structure is well-suited to the installation method of the range extender motor rotor and the engine. Compared with a relatively water-cooled motor rotor, rotor oil cooling is achieved without adding parts, simplifying the motor structure, reducing costs, and improving the reliability and stability of the motor.

[0036] Cooling oil flows into the inner wall of rotor hub 1, achieving a spray cooling effect on rotor hub 1 as the rotor rotates. Since rotor hub 1 also generates heat during rotation, cooling it helps to further improve the overall heat dissipation efficiency of the rotor. Spray cooling of rotor hub 1 enhances the cooling of the rotor core, thereby enhancing the cooling effect on the magnets, making the cooling of the entire motor more comprehensive and efficient.

[0037] like Figure 2 As shown, in some embodiments, the locking ring 5 is fixed to the end face of the rotor hub 1. The inner diameter of the locking ring 5 is smaller than the end face diameter of the rotor hub 1. The oil groove 11 is an axially extending strip groove. One end of the oil groove 11 is connected to the inner side of the end face of the locking ring 5, and the other end is connected to the oil hole 12.

[0038] The inner diameter of the locking ring 5 is smaller than the end face diameter of the rotor hub 1. When cooling oil flows into the inner wall of the rotor hub 1, the difference between the inner diameter of the locking ring 5 and the end face diameter of the rotor hub 1 creates axial obstruction to the cooling oil on the inner wall of the rotor hub 1. At this time, under the centrifugal force generated by the rotor rotation, the cooling oil flows along the guide inside the end face of the locking ring 5 into the axially extending oil groove 11, making it easier for the cooling oil to converge in the oil groove 11. After collecting the cooling oil, the oil groove 11 transports it to the connected oil passage hole 12. By adjusting the size of the oil passage hole 12, the flow rate of cooling oil flowing through the oil passage hole 12 can be changed. In practical applications, the size of the oil passage hole 12 can be flexibly adjusted according to different working conditions and cooling requirements to achieve precise control of the cooling oil volume, thereby optimizing the cooling effect of the rotor.

[0039] like Figure 2 As shown, in some embodiments, the inner diameter of the rotor hub 1 gradually increases toward the locking ring 5, and the inner wall of the rotor hub 1 is an inclined surface.

[0040] When cooling oil flows into the rotor hub 1, due to the inclined design of the inner wall of the rotor hub 1, the cooling oil flows along the inclined direction under the centrifugal force generated by the rotor rotation, and is continuously collected in the area with a relatively large inner diameter, and then flows towards the oil trough 11. After the cooling oil is collected in the oil trough 11, under the blocking action of the locking ring 5, the cooling oil flows in the opposite direction along the oil trough 11 into the oil passage hole 12. This inclined design helps to guide the flow direction of the cooling oil and improves the efficiency of the cooling oil entering the oil trough 11.

[0041] like Figure 3 and Figure 7 As shown, in some embodiments, the core assembly 3 includes a plurality of stacked magnetic steel sheets 32, each magnetic steel sheet 32 ​​having a cooling hole 321, and all cooling holes 321 are aligned to form an oil passage 31.

[0042] The magnet 32 ​​generates heat during operation. The oil passage 31 allows the cooling oil to effectively remove the heat from the magnet 32, ensuring its normal operating temperature. The oil passage 31 structure makes full use of the space within the magnet 32, achieving cooling of the core assembly 3 without adding extra complex structures, simplifying the oil circuit structure and reducing manufacturing costs.

[0043] like Figure 4 As shown, in some embodiments, the outer periphery of the rotor hub 1 is provided with an axially extending guide groove 13, and the inner holes of the front balance plate 2, the iron core assembly 3 and the rear balance plate 4 are all provided with guide blocks that cooperate with the guide groove 13.

[0044] During the assembly of the range extender motor rotor, the front balance plate 2, the core assembly 3, and the rear balance plate 4 move axially along the guide groove 13 on the outer periphery of the rotor hub 1 via guide blocks in their inner holes, thereby achieving accurate positioning and installation of each component on the rotor hub 1. When the rotor rotates, the cooperation of the guide groove 13 and the guide block enables the front balance plate 2, the core assembly 3, and the rear balance plate 4 to rotate synchronously.

[0045] like Figure 3 and Figure 4 As shown, in some embodiments, the outer peripheral wall of the rotor hub 1 is provided with a limiting protrusion ring 14, and the locking ring 5 presses the front balance plate 2, the iron core assembly 3 and the rear balance plate 4 against the limiting protrusion ring 14; the locking ring 5 is fixed to the rotor hub 1 by a threaded connection or an interference fit.

[0046] During assembly, after the front balance plate 2, the core assembly 3, and the rear balance plate 4 are sequentially fitted onto the rotor hub 1, the locking ring 5 is fixed to the rotor hub 1 by rotation or by applying a certain pressure. The locking ring 5 applies an axial clamping force to the front balance plate 2, the core assembly 3, and the rear balance plate 4, ensuring that these components fit tightly against the limiting protrusion ring 14, guaranteeing the connection stability between the components, and preventing axial movement of the components when the rotor rotates at high speed.

[0047] like Figure 4 As shown, in some embodiments, the inner wall of the rotor hub 1 is provided with a number of circumferentially spaced oil grooves 11, each oil groove 11 is provided with an oil passage hole 12, and the rear balance plate 4 is provided with a number of oil grooves 41 that are connected to the oil passage holes 12 one by one, and all oil grooves 41 are connected to oil grooves 42.

[0048] When the cooling oil flows into the inner wall of the rotor hub 1, it is collected into each oil groove 11 by the centrifugal force generated by the rotor rotation. The cooling oil then flows out through the corresponding oil passage 12 in each oil groove 11. This design with multiple oil grooves and passages allows the cooling oil to flow more evenly through the core assembly 3.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil circuit structure for a range extender motor rotor, characterized in that, It includes a rotor hub (1) connected to the output end of the engine crankshaft, and the outer periphery of the rotor hub (1) is sequentially connected to a front balance plate (2), an iron core assembly (3), a rear balance plate (4) and a locking ring (5); The inner wall of the rotor hub (1) is provided with an oil groove (11), the oil groove (11) is connected to an oil passage hole (12), and the oil passage hole (12) penetrates the side wall of the rotor hub (1). The rear balance plate (4) has an oil groove two (41) and an oil groove three (42) on one side end face. The oil groove three (42) is an annular groove structure. One end of the oil groove two (41) is connected to the oil groove three (42), and the other end is connected to the oil passage hole (12). The core assembly (3) is provided with an oil passage (31), and the front balance plate (2) is provided with an oil outlet hole (21). One end of the oil passage (31) is connected to the oil tank (42), and the other end is connected to the oil outlet hole (21).

2. The oil circuit structure of a range extender motor rotor according to claim 1, characterized in that, The locking ring (5) is fixed to the end face of the rotor hub (1). The inner diameter of the locking ring (5) is smaller than the end face diameter of the rotor hub (1). The first oil groove (11) is an axially extending strip groove. One end of the first oil groove (11) is connected to the inner side of the end face of the locking ring (5), and the other end is connected to the oil passage hole (12).

3. The oil circuit structure of a range extender motor rotor according to claim 2, characterized in that, The inner diameter of the rotor hub (1) gradually increases toward the locking ring (5), and the inner wall of the rotor hub (1) is an inclined surface.

4. The oil circuit structure of a range extender motor rotor according to claim 1, characterized in that, The core assembly (3) includes a plurality of stacked magnetic steel sheets (32), each of the magnetic steel sheets (32) is provided with a cooling hole (321), and all the cooling holes (321) are aligned to form the oil passage (31).

5. The oil circuit structure of a range extender motor rotor according to claim 1, characterized in that, The outer periphery of the rotor hub (1) is provided with an axially extending guide groove (13), and the inner holes of the front balance plate (2), the iron core assembly (3) and the rear balance plate (4) are all provided with guide blocks that cooperate with the guide groove (13).

6. The oil circuit structure of a range extender motor rotor according to claim 1, characterized in that, The outer peripheral wall of the rotor hub (1) is provided with a limiting protrusion ring (14), and the locking ring (5) presses the front balance plate (2), the iron core assembly (3) and the rear balance plate (4) against the limiting protrusion ring (14); the locking ring (5) is fixed to the rotor hub (1) by threaded connection or interference fit.

7. The oil circuit structure of a range extender motor rotor according to claim 1, characterized in that, The inner wall of the rotor hub (1) is provided with a number of circumferentially spaced oil grooves (11), each of the oil grooves (11) is provided with an oil passage hole (12), the rear balance plate (4) is provided with a number of oil grooves (41) that are connected one-to-one with the oil passage holes (12), and all the oil grooves (41) are connected to the oil grooves (42).

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