Motor rotor assembly and motor

Abstract

This utility model relates to the field of motor technology and discloses a motor rotor assembly and a motor. The motor rotor assembly includes: a motor shaft, which is hollow and has an oil guiding channel formed therein; an oil inlet is formed at one end of the motor shaft along the axial direction; a rotor core is sleeved on the outer peripheral wall of the motor shaft, and a rotor cooling oil channel is formed inside the rotor core; at least one end of the rotor core along the axial direction forms a component receiving area, which is suitable for accommodating at least one of a bearing, an end ring, or an end plate; a first oil passage is formed through the circumferential wall of the motor shaft, which is suitable for connecting the oil guiding channel and the rotor cooling oil channel; at least one second oil passage is also formed through the circumferential wall of the motor shaft, which is suitable for connecting the oil guiding channel and the component receiving area. The motor rotor assembly provided by this utility model can simultaneously cool the rotor core and the component receiving area, ensuring uniform cooling of key components.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a motor rotor assembly and a motor. Background Technology

[0002] The efficiency limit of a drive motor is typically constrained by its thermal limit. Among related technologies, air cooling has low efficiency and is only suitable for low-power motors; water cooling requires indirect heat dissipation through the casing, which has limited effectiveness in cooling directly heated areas such as windings and magnets inside the motor; and traditional oil cooling is mostly limited to spraying from the outer casing or circulating oil in the oil channels, unable to reach the core heat-generating parts of the rotor. Therefore, none of the above solutions can meet the requirements for efficient heat dissipation in the high-temperature areas inside the rotor.

[0003] In addition, the heat dissipation effect of the front and rear bearings of the motor, the front and rear end rings of the rotor, etc., also affects the overall performance of the motor. Utility Model Content

[0004] In view of this, the present invention provides a motor rotor assembly and a motor to solve the problem of poor overall heat dissipation performance of the motor rotor.

[0005] In a first aspect, this utility model provides a motor rotor assembly, comprising:

[0006] The motor shaft is hollow inside and has an oil guide channel. One end of the motor shaft has an oil inlet.

[0007] The rotor core is sleeved on the outer peripheral wall of the motor shaft, and a rotor cooling oil channel is formed inside the rotor core; at least one end of the rotor core along the axial direction forms a component receiving area, which is suitable for accommodating at least one of a bearing, an end ring, or an end plate.

[0008] The circumferential wall of the motor shaft is formed by a first oil passage suitable for connecting the oil guide channel with the rotor cooling oil passage; the circumferential wall of the motor shaft is also formed by at least one second oil passage suitable for connecting the oil guide channel with the accessory receiving area.

[0009] Beneficial Effects: The hollow interior of the motor shaft forms an oil guiding channel. Cooling medium is introduced through the shaft oil inlet and flows directly into the rotor cooling oil passage through the first oil passage, effectively reducing the internal temperature of the rotor. Simultaneously, the cooling medium flows into the component receiving area through the second oil passage, ensuring that critical components such as bearings, end rings, or end plates are adequately cooled, thereby improving the overall heat dissipation efficiency and operational stability of the motor. By rationally designing the oil passages on the motor shaft, the cooling medium flows into the guiding channel through the shaft oil inlet, cooling the rotor core and component receiving area separately, ensuring uniform cooling of all critical parts and preventing localized high temperatures in bearings, end rings, or end plates, effectively preventing localized overheating. This achieves efficient internal heat dissipation, significantly improving the stability and lifespan of the motor under high loads. Furthermore, under harsh operating conditions such as motor tilting, ensuring uniform flow of the cooling medium throughout the motor prevents uneven distribution of cooling medium to both ends of the rotor.

[0010] In one alternative embodiment, the motor rotor assembly further includes: a first end ring disposed at one end of the rotor core along the axial direction;

[0011] The second end ring is located at the other end of the rotor core along the axial direction.

[0012] The second oil passage includes a second shaft hole and a fifth shaft hole. The second shaft hole is adapted to spray cooling medium toward the first end ring, and the fifth shaft hole is adapted to spray cooling medium toward the second end ring.

[0013] Beneficial effects: By setting the second and fifth shaft holes, cooling medium can be sprayed toward the first and second end rings respectively, effectively reducing the temperature of the two end rings, preventing performance degradation due to overheating, and further improving the overall heat dissipation efficiency and operational stability of the motor.

[0014] In one alternative embodiment, the motor rotor assembly further includes: a first bearing, sleeved on the motor shaft and located at one end of the rotor core along the axial direction;

[0015] The second oil passage includes a first shaft hole, which is adapted to spray cooling medium toward the first bearing;

[0016] And / or, the motor rotor assembly further includes: a second bearing, sleeved on the motor shaft and located at the other end of the rotor core along the axial direction;

[0017] The second oil passage includes a sixth shaft hole and a seventh shaft hole, which are adapted to spray cooling medium toward the second bearing.

[0018] Beneficial effects: The bearings of the motor provide support and reduce friction, but they are prone to overheating during prolonged operation. By spraying cooling media into the first and second bearings through the first, sixth, and seventh shaft holes respectively, the bearing temperature is effectively reduced, service life is extended, and the motor's efficient and stable operation is ensured.

[0019] In one optional embodiment, the motor shaft further includes: an oil pipe disposed inside the motor shaft, one end of the oil pipe being connected to the shaft oil inlet, and the oil pipe being adapted to divide the oil guiding channel into a delivery sub-channel located inside the oil pipe and a flow equalization sub-channel located outside the oil pipe.

[0020] The circumferential wall of the oil pipe is formed with at least one oil pipe outlet hole, which is suitable for connecting the delivery sub-channel and the flow equalization sub-channel.

[0021] Beneficial effects: This embodiment divides the oil guide channel into a delivery sub-channel and a flow equalization sub-channel by setting up an oil pipe and its oil outlet. This allows more oil to be guided to the side away from the shaft oil inlet and then sprayed out from the oil pipe outlet. This ensures that the cooling medium is more evenly distributed in the flow equalization sub-channel, thereby effectively improving the cooling effect, avoiding local overheating, ensuring the temperature of each component of the motor is balanced, further extending the service life of the motor, and improving the overall operational reliability.

[0022] In one optional embodiment, the oil pipe outlet includes at least a first oil pipe outlet and a second oil pipe outlet;

[0023] The first oil passage includes a third shaft hole and a fourth shaft hole. The third shaft hole is adapted to communicate with the annular oil passage groove of the first oil inlet plate, and the fourth shaft hole is adapted to communicate with the annular oil passage groove of the second oil inlet plate.

[0024] The first oil outlet hole of the oil pipe is set radially to correspond to the third shaft hole, and the second oil outlet hole of the oil pipe is set radially to correspond to the fourth shaft hole.

[0025] In one alternative embodiment, the rotor core includes: at least one oil passage plate, the oil passage plate having a plurality of oil passage plate oil holes suitable for the flow of cooling medium;

[0026] The oil inlet plate includes a first oil inlet plate and a second oil inlet plate, which are respectively disposed on both sides of the oil passage plate along the axial direction. The oil inlet plate has multiple oil inlet through holes. The oil inlet through holes of the first oil inlet plate are connected to the oil holes of the first part of the oil passage plate, and the oil inlet through holes of the second oil inlet plate are connected to the oil holes of the second part of the oil passage plate. The oil inlet plate also has multiple radially extending oil inlet plate distribution channels, which are adapted to serve as oil inlets of the first oil passage. The oil inlet distribution channels of the second oil inlet plate are connected to the oil holes of the first part of the oil passage plate, and the oil inlet distribution channels of the first oil inlet plate are connected to the oil holes of the second part of the oil passage plate.

[0027] The fuel injector includes a first fuel injector disposed along the axial direction on the side of the first fuel inlet plate away from the fuel channel plate, and a second fuel injector disposed on the side of the second fuel inlet plate away from the fuel channel plate. The fuel injector has a plurality of fuel injection holes. The fuel injection holes of the first fuel injector are connected to the fuel inlet plate through holes of the first fuel inlet plate, and the fuel injection holes of the second fuel injector are connected to the fuel inlet plate through holes of the second fuel inlet plate.

[0028] Beneficial effects: In this embodiment, the rotor core, through the combination of three types of rotor laminations, achieves an oil flow pattern where the oil enters from both ends and is ejected from opposite end faces under oil pressure. This fully cools the rotor core, achieving a deep oil cooling effect, minimizing the temperature rise of the rotor core, thereby effectively improving the motor's thermal load and electrical density, greatly improving cooling efficiency, and increasing the motor's power density.

[0029] In one optional embodiment, a first mounting shaft hole is formed through the axial position of the oil passage plate, and the first mounting shaft hole is sleeved on the outer periphery of the motor shaft.

[0030] A second mounting shaft hole is formed through the axial position of the oil inlet plate. The second mounting shaft hole is sleeved on the outer circumference of the motor shaft and spaced apart from the motor shaft. The spaced area between the oil inlet plate and the motor shaft, together with the oil passage plate and the oil injection plate, forms an annular oil passage groove.

[0031] The annular oil passage is connected to the oil distribution channel of the oil inlet plate.

[0032] Beneficial effects: This embodiment, by fitting the second mounting shaft hole onto the outer circumference of the motor shaft and spaced apart from it, creates a gap between the motor shaft and the second mounting shaft hole, forming an annular oil passage groove to ensure smooth flow of the cooling medium. When the rotor core and motor shaft are press-fitted into a rotor assembly, the oil holes of the rotor core and motor shaft do not need to be precisely positioned. This ensures that the cooling medium passes through the annular oil passage groove and then enters the rotor core for cooling via the oil distribution channel of the oil inlet plate, preventing oil passage blockage. It eliminates the need for precise positioning of the motor shaft oil holes, resulting in higher reliability, improved assembly efficiency, and reduced time spent on repeated alignment.

[0033] In one optional embodiment, a third mounting shaft hole is formed through the axial position of the oil injection blade, and the third mounting shaft hole is sleeved on the outer periphery of the motor shaft.

[0034] Along the axial direction, the first oil spray blade is adapted to block the oil distribution channel of the first oil inlet blade, and the second oil spray blade is adapted to block the oil distribution channel of the second oil inlet blade.

[0035] Beneficial effects: In this embodiment, the oil spray blades not only function as oil sprayers but also as sealing plates. The first oil spray blade is suitable for blocking the oil distribution channel of the first oil inlet blade, and the second oil spray blade is suitable for blocking the oil distribution channel of the second oil inlet blade, thereby ensuring that the cooling medium, after entering through the oil distribution channel of the oil inlet blade, can flow towards the opposite end face so that after passing through the oil holes of the oil channel plate, it can be sprayed out from the oil spray holes on the opposite side.

[0036] In one optional embodiment, the first oil passage includes a third shaft hole and a fourth shaft hole, the third shaft hole being adapted to communicate with the annular oil passage groove of the first oil inlet plate, and the fourth shaft hole being adapted to communicate with the annular oil passage groove of the second oil inlet plate.

[0037] Beneficial effects: By adapting the third shaft hole to connect with the annular oil passage groove of the first oil inlet plate and the fourth shaft hole to connect with the annular oil passage groove of the second oil inlet plate, it is ensured that the cooling medium can enter the motor shaft on both sides, thereby effectively balancing the oil pressure distribution inside the motor and reducing uneven heat dissipation caused by uneven oil pressure.

[0038] Secondly, this utility model also provides an electric motor, comprising:

[0039] Stator structure;

[0040] And the motor rotor assembly as described above.

[0041] Since the motor includes a motor rotor assembly, it has the same effect as the motor rotor assembly, so it will not be elaborated here. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is an isometric view of the motor rotor assembly of this utility model;

[0044] Figure 2 This is a cross-sectional schematic diagram of the motor rotor assembly of this utility model at the first position;

[0045] Figure 3 This is a cross-sectional schematic diagram of the motor rotor assembly of this utility model at the second position;

[0046] Figure 4 This is a schematic diagram of the motor shaft of this utility model;

[0047] Figure 5 for Figure 4 Schematic diagram of section AA;

[0048] Figure 6 This is an exploded view of the rotor core of this utility model;

[0049] Figure 7 This is a schematic diagram of the oil passage plate of this utility model;

[0050] Figure 8 This is a schematic diagram of the oil inlet plate of this utility model;

[0051] Figure 9 This is a schematic diagram of the oil spray blade of this utility model;

[0052] Figure 10 This is a schematic diagram of the stacked oil passage plate and oil inlet plate of this utility model.

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Rotor core; 11. Oil passage plate; 111. Oil hole in oil passage plate; 112. First mounting shaft hole;

[0055] 12. Oil inlet plate; 1201. First oil inlet plate; 1202. Second oil inlet plate;

[0056] 121. Oil inlet plate oil passage hole; 122. Oil inlet plate oil distribution channel; 123. Annular oil groove; 124. Second mounting shaft hole;

[0057] 13. Fuel injection plate; 1301. First fuel injection plate; 1302. Second fuel injection plate;

[0058] 131. Oil injection hole; 132. Third mounting shaft hole;

[0059] 2. Motor shaft; 201. First shaft hole; 202. Second shaft hole; 203. Third shaft hole; 204. Fourth shaft hole; 205. Fifth shaft hole; 206. Sixth shaft hole; 207. Seventh shaft hole;

[0060] 21. Shaft oil inlet; 22. Oil pipe; 221. First oil outlet of oil pipe; 222. Second oil outlet of oil pipe; 23. Oil guide channel; 231. Conveying sub-channel; 232. Flow equalization sub-channel;

[0061] 3. First end ring; 4. Second end ring. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, 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 protection scope of this utility model.

[0063] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical 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 according to the specific circumstances.

[0065] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0066] With the increasing demands for miniaturization and lightweight motors in fields such as electric vehicles and aerospace, motor power density (output power per unit volume / mass) is constantly improving, leading to a surge in heat generation. The efficiency limit of drive motors is usually constrained by their thermal limit capability. Under high-temperature conditions, rotor eddy current losses, windage losses, aluminum losses, and iron losses in high-speed motors increase significantly. Localized high temperatures can easily lead to demagnetization of permanent magnets and weakening of the core, aluminum rings, and conductor bars, directly affecting motor lifespan and reliability under harsh conditions such as high speed and high current. Among related technologies, air cooling has low heat dissipation efficiency and is only suitable for low-power motors; water cooling requires indirect heat dissipation through the casing, and its cooling effect on directly heated areas such as windings and magnets inside the motor is limited; while traditional oil cooling is mostly limited to outer casing spraying or oil channel circulation, and cannot penetrate deep into the core heat-generating parts of the rotor. Some solutions that use oil inlet in the middle of the core section and distribute it to both ends of the core for cooling are prone to localized high-temperature points in the end rings and core, and the uneven distribution of cooling medium to both ends of the rotor is further aggravated under harsh conditions such as motor tilting. Therefore, the above solutions are insufficient to meet the requirements for efficient heat dissipation in the high-temperature areas inside the rotor.

[0067] In addition, the heat dissipation effect of the front and rear bearings of the motor, the front and rear end rings of the rotor, etc., also affects the overall performance of the motor.

[0068] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0069] According to an embodiment of the present invention, in one aspect, a motor rotor assembly is provided, comprising:

[0070] The motor shaft 2 is hollow inside and has an oil guide channel 23. One end of the motor shaft 2 has an oil inlet 21.

[0071] The rotor core 1 is sleeved on the outer peripheral wall of the motor shaft 2, and a rotor cooling oil channel is formed inside the rotor core 1; at least one end of the rotor core 1 along the axial direction forms a component receiving area, which is suitable for accommodating at least one of a bearing, an end ring, or an end plate.

[0072] The circumferential wall of the motor shaft 2 is formed with a first oil passage suitable for connecting the oil guide channel 23 with the rotor cooling oil passage; the circumferential wall of the motor shaft 2 is also formed with at least one second oil passage suitable for connecting the oil guide channel 23 with the accessory receiving area.

[0073] In this embodiment, the motor shaft 2 is hollow and has an oil guide channel 23. One end of the motor shaft 2 along the axial direction has a shaft oil inlet 21, and the other end of the motor shaft 2 along the axial direction is sealed. Cooling medium is introduced through the shaft oil inlet 21 and enters the rotor cooling oil passage directly through the first oil passage, effectively reducing the internal temperature of the rotor. At the same time, the cooling medium flows into the component receiving area through the second oil passage, ensuring that key components such as bearings, end rings or end plates are fully cooled, thereby improving the overall heat dissipation efficiency and operational stability of the motor.

[0074] The first and second oil passages are both formed by the circumferential wall of the motor shaft 2. By reasonably setting the opening position and number of the first and second oil passages, the cooling medium can be evenly distributed inside the rotor and in the component accommodating area, effectively avoiding local high temperature phenomena.

[0075] The motor rotor assembly provided in this embodiment of the invention, through the reasonable arrangement of oil passages on the motor shaft 2, allows the cooling medium to flow into the oil guide channel 23 via the shaft oil inlet 21, cooling the rotor core and the component housing area separately in two ways. This ensures uniform cooling of key components and avoids localized high-temperature points in bearings, end rings, or end plates, effectively preventing localized overheating. This achieves efficient internal heat dissipation, significantly improving the stability and lifespan of the motor under high loads. Furthermore, under harsh operating conditions such as motor tilting, ensuring uniform flow of the cooling medium throughout the motor prevents uneven distribution of the cooling medium to both ends of the rotor.

[0076] In some embodiments, the rotor core 1 includes at least one oil passage plate 11, the oil passage plate 11 having a plurality of oil passage plate oil holes 111 suitable for flowing cooling medium;

[0077] The oil inlet plate 12 includes a first oil inlet plate 1201 and a second oil inlet plate 1202, which are respectively disposed on both sides of the oil passage plate 11 along the axial direction. The oil inlet plate 12 has a plurality of oil inlet plate through holes 121. The oil inlet plate through holes 121 of the first oil inlet plate 1201 are connected to the oil passage plate oil holes 111 of the first part, and the oil inlet plate through holes 121 of the second oil inlet plate 1202 are connected to the first oil passage plate oil holes 111 of the first part. The oil passage holes 111 of the two parts are connected; the oil inlet plate 12 is also provided with a plurality of radially extending oil inlet plate distribution channels 122, which are adapted to serve as the oil inlet of the first oil passage; the oil inlet plate distribution channel 122 of the second oil inlet plate 1202 is connected to the oil passage hole 111 of the first part, and the oil inlet plate distribution channel 122 of the first oil inlet plate 1201 is connected to the oil passage hole 111 of the second part;

[0078] The fuel injector 13 includes a first fuel injector 1301 disposed along the axial direction on the side of the first fuel inlet 1201 away from the fuel channel 11, and a second fuel injector 1302 disposed on the side of the second fuel inlet 1202 away from the fuel channel 11. The fuel injector 13 has a plurality of fuel injection holes 131. The fuel injection holes 131 of the first fuel injector 1301 are connected to the fuel inlet through holes 121 of the first fuel inlet 1201, and the fuel injection holes 131 of the second fuel injector 1302 are connected to the fuel inlet through holes 121 of the second fuel inlet 1202.

[0079] In this embodiment, the rotor core 1 is composed of three types of rotor laminations: oil channel lamination 11, oil inlet lamination 12, and oil spraying lamination 13. Each type of lamination is stacked in a specific order to ensure precise connection of the oil channels and form a high-efficiency cooling system.

[0080] The following provides a detailed explanation of the three types of rotor laminations:

[0081]

Oilway Plate 11

[0082] The oil channel plate 11 is the main plate type and the most numerous. It can be composed of multiple oil channel plates 11 stacked together. The oil holes 111 of each layer of oil channel plates 11 are precisely aligned to ensure smooth flow of the cooling medium.

[0083] Combination Figure 7 As shown, multiple oil passage holes 111 are evenly distributed around the inner circumference of the oil passage plate 11. For example, each oil passage plate 11 has 2N oil passage holes 111, where N is a positive integer. The oil passage holes 111 serve as the main cooling channels inside the rotor core 1.

[0084] The oil passage holes 111 are designed with the principle of maximizing heat dissipation area. Therefore, under the premise of ensuring product strength and the feasibility of stamping manufacturing, the number of oil passage holes 111 on each oil passage 11 should be as large as possible. The shape of the oil passage holes 111 is not limited to circles, rectangles, etc., and can be any shape.

[0085] Specifically, the oil hole 111 of the oil channel plate is designed in the blank area of ​​the magnetic flux density of the oil channel plate 11, so as to make the flow channel cross section as large as possible and close to the groove without affecting the electromagnetic performance of the motor.

[0086]

Oil Inlet Plate 12

[0087] The oil inlet plate 12 is located at both ends of the oil passage plate 11 along the axial direction. The oil inlet plate 12 acts as an oil inlet channel, which can spread the cooling medium sprayed from the first oil passage of the motor shaft 2 along the circumference and evenly distribute it into the oil passage plate oil hole 111 on the oil passage plate 11.

[0088] The oil inlet plate 12 also has multiple radially extending oil inlet plate distribution channels 122, which are suitable as oil inlets for the first oil passage. The oil inlet plate distribution channels 122 of the second oil inlet plate 1202 are connected to the oil holes 111 of the first part of the oil passage plate, and the oil inlet plate distribution channels 122 of the first oil inlet plate 1201 are connected to the oil holes 111 of the second part of the oil passage plate. For example, the oil inlet plate distribution channels 122 of the second oil inlet plate 1202 are connected to N oil holes 111 of the oil passage plate, while the oil inlet plate distribution channels 122 of the first oil inlet plate 1201 are connected to the remaining N oil holes 111 of the oil passage plate, ensuring uniform distribution of the cooling medium. This facilitates the cooling medium to flow to both sides along the axial direction and then be sprayed out from both sides by the oil spray plate 13, forming a symmetrical cooling effect and improving the uniformity of the distribution of cooling medium at both ends.

[0089] It should be noted that the oil inlet channel 122 is suitable as the inlet of the first oil passage, specifically connected to the annular oil groove 123 and further connected to the oil guide channel 23. This allows the cooling medium to enter the rotor core 1 from the oil inlet channel 122 and form subsequent flow circulation. The connection path of the oil inlet channel 122 will be described in detail below.

[0090] In addition, the oil inlet hole 121 of the oil inlet plate 12 needs to correspond to the oil hole 111 of the oil channel plate to ensure that the cooling medium flows out normally and prevent the cooling medium from being unable to flow, which would cause the temperature to rise and affect the overall heat dissipation.

[0091] The end face of the oil inlet plate 12 is in close contact with the oil channel plate 11, ensuring that the oil flows evenly from the oil distribution channel 122 of the oil inlet plate into the oil hole 111 of the oil channel plate, forming a stable oil flow and improving the cooling effect.

[0092] In this embodiment, combined with Figure 8 As shown, the oil inlet plate 12 has an oil distribution channel 122 and an oil passage hole 121 alternately arranged. The oil passage hole 121 is connected to the oil passage hole 111 of the first part of the oil passage plate. Correspondingly, the oil distribution channel 122 is connected to the oil passage hole 111 of the second part of the adjacent hole position.

[0093] The first oil inlet plate 1201 and the second oil inlet plate 1202 on both sides are staggered to ensure that the cooling medium flows in an alternating manner within the oil channel plate.

[0094]

Spray Spray Plate 13

[0095] Oil spray plates 13 are located at both ends of the rotor core 1 along the axial direction. Their functions are, on the one hand, to connect with the oil inlet plate 12 to form a closed oil cavity, and on the other hand, to have oil spray holes 131 designed on them, which serve as oil outlets for the oil passages on one end face of the entire core. The oil spray holes 131 of the oil spray plates are staggered with the oil inlet plate oil distribution channels 122 of the oil inlet plate 12, which allows the oil in the rotor core 1 to form a certain pressure and then be sprayed out from the end face opposite to the oil inlet position to dissipate heat from the rotor core, thereby driving more heat inside the rotor core 1. At the same time, under the action of centrifugal force, the sprayed cooling medium can also cool the end rings or end plates of the rotor.

[0096] The fuel injection blade 13 includes a first fuel injection blade 1301 disposed along the axial direction on the side of the first fuel inlet blade 1201 away from the fuel passage blade 11, and a second fuel injection blade 1302 disposed on the side of the second fuel inlet blade 1202 away from the fuel passage blade 11, combined with Figure 9 As shown, each spray plate 13 has N spray holes 131. No spray holes 131 are located between two adjacent spray holes 131, and this area without spray holes 131 corresponds to the oil distribution channel 122 of the inlet plate. This ensures that the cooling medium, after entering through the oil distribution channel 122, flows towards the opposite end face, so that after passing through the oil holes 111 of the oil channel plate, it is sprayed out from the spray holes 131 on the opposite side, forming effective convection cooling. In other words, the spray plate 13 also acts as a sealing plate, effectively preventing oil leakage and ensuring maximum cooling effect. This rationally plans the flow path of the cooling medium.

[0097] It should be noted that the optimal number of oil injection holes 131 on each oil injection plate 13 is half the number of oil holes 111 on the oil channel plate. Of course, non-uniform distribution can also achieve this cooling effect, but it is easy to cause uneven oil channels at both ends.

[0098] In this embodiment, the rotor core 1, through the combination of three types of rotor laminations, achieves an oil flow pattern where the oil enters from both ends and is ejected from opposite end faces under oil pressure. This fully cools the rotor core 1, achieving a deep oil cooling effect, minimizing the temperature rise of the rotor core 1, thereby effectively improving the motor's thermal load and electrical density, greatly improving cooling efficiency, and increasing the motor's power density.

[0099] In some embodiments, a first mounting shaft hole 112 is formed through the axial center of the oil passage plate 11, and the first mounting shaft hole 112 is sleeved on the outer periphery of the motor shaft 2;

[0100] A second mounting shaft hole 124 is formed through the axial position of the oil inlet plate 12. The second mounting shaft hole 124 is sleeved on the outer periphery of the motor shaft 2 and spaced apart from the motor shaft 2. The spaced area between the oil inlet plate 12 and the motor shaft 2, together with the oil passage plate 11 and the oil spray plate 13, forms an annular oil passage groove 123.

[0101] The annular oil groove 123 is connected to the oil distribution channel 122 of the oil inlet plate.

[0102] In this embodiment, the radius of the first mounting shaft hole 112 is R1, and the radius from the center line of the motor shaft 2 to the outer peripheral wall is R0, satisfying: R1 = R0. The first mounting shaft hole 112 can be interference-fitted with the motor shaft 2 to ensure that the cooling medium will not flow out from the gap between the first mounting shaft hole 112 and the motor shaft 2, thus avoiding leakage.

[0103] In this embodiment, the radius of the second mounting shaft hole 124 is R2, and R2 > R1 = R0.

[0104] When R2 = R0, the oil hole of the motor shaft 2 and the oil distribution channel 122 of the oil inlet plate need to be precisely positioned to ensure that the cooling medium sprayed through the first oil passage of the motor shaft accurately enters the oil distribution channel 122 of the oil inlet plate; otherwise, the cooling medium will not be able to be sprayed out; the assembly precision requirement is extremely high.

[0105] This embodiment, by designing R2 to be greater than R0, creates a gap between the motor shaft 2 and the second mounting shaft hole 124, thereby forming an annular oil passage groove 123 to ensure smooth flow of the cooling medium. When the rotor core 1 and the motor shaft 2 are press-fitted into a rotor assembly, the oil holes of the rotor core 1 and the motor shaft 2 do not need to be precisely positioned. This ensures that the cooling medium passes through the annular oil passage groove 123 and then enters the rotor core for cooling through the oil distribution channel 122 of the oil inlet plate, without clogging the oil passage. Precise positioning of the motor shaft oil hole is unnecessary, resulting in higher reliability, improved assembly efficiency, and reduced time spent on repeated alignment.

[0106] In some embodiments, a third mounting shaft hole 132 is formed through the axial center of the oil spray blade 13, and the third mounting shaft hole 132 is sleeved on the outer periphery of the motor shaft 2;

[0107] Along the axial direction, the first fuel injector 1301 is adapted to block the fuel inlet channel 122 of the first fuel inlet 1201, and the second fuel injector 1302 is adapted to block the fuel inlet channel 122 of the second fuel inlet 1202.

[0108] In this embodiment, the oil spray plate 13 not only functions as an oil sprayer but also as a sealing plate. The first oil spray plate 1301 is adapted to block the oil inlet distribution channel 122 of the first oil inlet plate 1201, and the second oil spray plate 1302 is adapted to block the oil inlet distribution channel 122 of the second oil inlet plate 1202, thereby ensuring that after the cooling medium enters through the oil inlet distribution channel 122, it can flow towards the opposite end face so that after passing through the oil passage plate oil hole 111, it can be sprayed out from the oil spray hole 131 on the opposite side.

[0109] Meanwhile, because the oil spray plate 13 blocks part of the oil inlet plate distribution channel 122, the oil spray plate 13 also makes the cooling medium have a certain pressure. Even under harsh conditions such as motor tilting, it can still be sprayed evenly, avoiding the situation where the cooling medium cannot be evenly distributed under harsh conditions such as motor tilting, which would lead to the temperature imbalance between the left and right sides of the motor.

[0110] In some embodiments, the first oil passage includes a third shaft hole 203 and a fourth shaft hole 204. The third shaft hole 203 is adapted to communicate with the annular oil passage groove 123 of the first oil inlet plate 1201, and the fourth shaft hole 204 is adapted to communicate with the annular oil passage groove 123 of the second oil inlet plate 1202.

[0111] In this embodiment, the third shaft hole 203 and the fourth shaft hole 204 are located at the relative middle position of the motor shaft 2 along the axial direction. By adapting the third shaft hole 203 to communicate with the annular oil groove 123 of the first oil inlet plate 1201 and the fourth shaft hole 204 to communicate with the annular oil groove 123 of the second oil inlet plate 1202, it is ensured that the cooling medium can enter the motor shaft on both sides, thereby effectively balancing the oil pressure distribution inside the motor and reducing the uneven heat dissipation effect caused by uneven oil pressure.

[0112] In some embodiments, the motor rotor assembly further includes: a first end ring 3, disposed at one end of the rotor core 1 along the axial direction;

[0113] The second end ring 4 is located at the other end of the rotor core 1 along the axial direction;

[0114] The second oil passage includes a second shaft hole 202 and a fifth shaft hole 205. The second shaft hole 202 is adapted to spray cooling medium toward the first end ring 3, and the fifth shaft hole 205 is adapted to spray cooling medium toward the second end ring 4.

[0115] Since the rotor core 1 is also provided with a first end ring 3 and a second end ring 4 at both ends along the axial direction, and the first end ring 3 and the second end ring 4 are in close contact with the rotor core 1, they also generate heat during long-term operation.

[0116] This embodiment, by setting the second shaft hole 202 and the fifth shaft hole 205, can spray cooling medium toward the first end ring 3 and the second end ring 4 respectively, effectively reducing the temperature of the two end rings, preventing performance degradation due to overheating, and further improving the overall heat dissipation efficiency and operational stability of the motor.

[0117] In some embodiments, the motor rotor assembly further includes: a first bearing, sleeved on the motor shaft 2 and located at one end of the rotor core 1 along the axial direction; and a second oil passage including a first shaft hole 201, the first shaft hole 201 being adapted to spray cooling medium toward the first bearing.

[0118] And / or,

[0119] The motor rotor assembly also includes: a second bearing, which is sleeved on the motor shaft 2 and located at the other end of the rotor core 1 along the axial direction; and a second oil passage including a sixth shaft hole 206 and a seventh shaft hole 207, which are adapted to spray cooling medium toward the second bearing.

[0120] The bearings of the motor provide support and reduce friction, but they tend to overheat during prolonged operation. Cooling media is sprayed onto the first and second bearings through the first shaft hole 201, the sixth shaft hole 206, and the seventh shaft hole 207, respectively, effectively reducing bearing temperature, extending service life, and ensuring efficient and stable motor operation.

[0121] In some embodiments, the motor shaft 2 further includes: an oil pipe 22 disposed inside the motor shaft 2, one end of the oil pipe 22 being connected to the shaft oil inlet 21, and the oil pipe 22 being adapted to divide the oil guide channel 23 into a delivery sub-channel 231 located inside the oil pipe 22 and a flow equalization sub-channel 232 located outside the oil pipe 22;

[0122] At least one oil outlet hole is formed through the circumferential wall of the oil pipe 22, which is suitable for connecting the delivery sub-channel 231 and the flow equalization sub-channel 232.

[0123] In this embodiment, the motor shaft 2 is a hollow shaft, and an oil guide channel 23 is formed inside the hollow motor shaft 2. Since an oil inlet 21 is formed at one end of the motor shaft 2 along the axial direction, if oil is supplied only through the oil inlet 21, it may cause more oil to enter the first oil passage or the second oil passage on the side closer to the oil inlet 21 after entering the oil guide channel 23, thereby affecting the uniform distribution of the cooling medium.

[0124] This embodiment divides the oil guide channel 23 into a delivery sub-channel 231 and a flow equalization sub-channel 232 by setting up an oil pipe 22 and its oil outlet hole. This allows more oil to be guided to the side away from the shaft oil inlet 21 and then sprayed out from the oil pipe outlet hole. This ensures that the cooling medium is more evenly distributed in the flow equalization sub-channel 232, thereby effectively improving the cooling effect, avoiding local overheating, ensuring the temperature of each component of the motor is balanced, further extending the service life of the motor, and improving the overall operational reliability.

[0125] Combination Figure 5 As shown, through the proper guidance of the oil pipe 22, the cooling medium can flow evenly in the oil guide channel 23. The multiple oil passages formed by the circumferential wall of the motor shaft 2 can provide targeted cooling for bearings, end rings or end plates and iron cores at different positions, ensuring uniform temperature of each component, improving rotor reliability and enhancing overall motor performance.

[0126] In some embodiments, the oil pipe outlet includes at least a first oil pipe outlet 221 and a second oil pipe outlet 222;

[0127] The first oil passage includes a third shaft hole 203 and a fourth shaft hole 204. The third shaft hole 203 is adapted to communicate with the annular oil passage groove 123 of the first oil inlet plate 1201, and the fourth shaft hole 204 is adapted to communicate with the annular oil passage groove 123 of the second oil inlet plate 1202.

[0128] The first oil outlet hole 221 of the oil pipe is set radially to correspond to the third shaft hole 203, and the second oil outlet hole 222 of the oil pipe is set radially to correspond to the fourth shaft hole 204.

[0129] According to an embodiment of the present invention, another aspect provides a motor, comprising:

[0130] Stator structure;

[0131] And the motor rotor assembly as described above.

[0132] Obviously, the above embodiments are merely examples for clear illustration and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. A motor rotor assembly, characterized in that, include: The motor shaft (2) is hollow inside and has an oil guide channel (23). One end of the motor shaft (2) has an oil inlet (21). A rotor core (1) is sleeved on the outer peripheral wall of the motor shaft (2), and a rotor cooling oil passage is formed inside the rotor core (1); at least one end of the rotor core (1) along the axial direction forms a component receiving area, and the component receiving area is suitable for setting at least one of a bearing, an end ring or an end plate; The circumferential wall of the motor shaft (2) is formed with a first oil passage suitable for connecting the oil guide channel (23) with the rotor cooling oil passage; the circumferential wall of the motor shaft (2) is also formed with at least one second oil passage, which is suitable for connecting the oil guide channel (23) with the accessory receiving area.

2. The motor rotor assembly according to claim 1, characterized in that, The motor rotor assembly further includes: a first end ring (3), which is disposed at one end of the rotor core (1) along the axial direction; The second end ring (4) is disposed at the other end of the rotor core (1) along the axial direction; The second oil passage includes a second shaft hole (202) and a fifth shaft hole (205). The second shaft hole (202) is adapted to spray cooling medium toward the first end ring (3), and the fifth shaft hole (205) is adapted to spray cooling medium toward the second end ring (4).

3. The motor rotor assembly according to claim 1, characterized in that, The motor rotor assembly further includes: a first bearing, which is sleeved on the motor shaft (2) and located at one end of the rotor core (1) along the axial direction; the second oil passage includes a first shaft hole (201), which is adapted to spray cooling medium toward the first bearing; And / or, The motor rotor assembly further includes: a second bearing, which is sleeved on the motor shaft (2) and located at the other end of the rotor core (1) along the axial direction; the second oil passage includes a sixth shaft hole (206) and a seventh shaft hole (207), which are adapted to spray cooling medium toward the second bearing.

4. The motor rotor assembly according to claim 1, characterized in that, The motor shaft (2) further includes: an oil pipe (22), which is disposed inside the motor shaft (2). One end of the oil pipe (22) is connected to the shaft oil inlet (21). The oil pipe (22) is adapted to divide the oil guide channel (23) into a conveying sub-channel (231) located inside the oil pipe (22) and a flow equalization sub-channel (232) located outside the oil pipe (22). At least one oil outlet hole is formed through the circumferential wall of the oil pipe (22), which is adapted to connect the delivery sub-channel (231) and the flow equalization sub-channel (232).

5. The motor rotor assembly according to claim 4, characterized in that, The oil pipe outlet includes at least a first oil pipe outlet (221) and a second oil pipe outlet (222); The first oil passage includes a third shaft hole (203) and a fourth shaft hole (204). The third shaft hole (203) is adapted to communicate with the annular oil passage groove (123) of the first oil inlet plate (1201), and the fourth shaft hole (204) is adapted to communicate with the annular oil passage groove (123) of the second oil inlet plate (1202). The first oil outlet hole (221) of the oil pipe is arranged radially corresponding to the third shaft hole (203), and the second oil outlet hole (222) of the oil pipe is arranged radially corresponding to the fourth shaft hole (204).

6. The motor rotor assembly according to claim 1, characterized in that, The rotor core (1) includes at least one oil passage plate (11), which has multiple oil passage plate oil holes (111) suitable for the flow of cooling medium. The oil inlet plate (12) includes a first oil inlet plate (1201) and a second oil inlet plate (1202). The first oil inlet plate (1201) and the second oil inlet plate (1202) are respectively disposed on both sides of the oil passage plate (11) along the axial direction. The oil inlet plate (12) has a plurality of oil inlet plate through holes (121). The oil inlet plate through holes (121) of the first oil inlet plate (1201) are connected to the oil passage plate oil holes (111) of the first part. The oil inlet plate through holes (121) of the second oil inlet plate (1202) are connected to the first oil passage plate oil holes (111) of the second part. The oil passage holes (111) of the two parts are connected; the oil inlet plate (12) is also provided with a plurality of radially extending oil inlet plate distribution channels (122), the oil inlet plate distribution channels (122) are adapted to serve as the oil inlet of the first oil passage; the oil inlet plate distribution channels (122) of the second oil inlet plate (1202) are connected to the oil passage holes (111) of the first part, and the oil inlet plate distribution channels (122) of the first oil inlet plate (1201) are connected to the oil passage holes (111) of the second part; The fuel injector (13) includes a first fuel injector (1301) disposed along the axial direction on the side of the first fuel inlet (1201) away from the fuel channel (11), and a second fuel injector (1302) disposed on the side of the second fuel inlet (1202) away from the fuel channel (11). The fuel injector (13) has a plurality of fuel injection holes (131). The fuel injection holes (131) of the first fuel injector (1301) are connected to the fuel inlet through hole (121) of the first fuel inlet (1201), and the fuel injection holes (131) of the second fuel injector (1302) are connected to the fuel inlet through hole (121) of the second fuel inlet (1202).

7. The motor rotor assembly according to claim 6, characterized in that, The oil passage plate (11) has a first mounting shaft hole (112) through its axial position, and the first mounting shaft hole (112) is sleeved on the outer periphery of the motor shaft (2); The oil inlet plate (12) has a second mounting shaft hole (124) through its axial center. The second mounting shaft hole (124) is sleeved on the outer periphery of the motor shaft (2) and spaced apart from the motor shaft (2). The spaced area between the oil inlet plate (12) and the motor shaft (2), together with the oil passage plate (11) and the oil spray plate (13), forms an annular oil passage groove (123). The annular oil passage (123) is connected to the oil distribution channel (122) of the oil inlet plate.

8. The motor rotor assembly according to claim 7, characterized in that, The oil spray blade (13) has a third mounting shaft hole (132) through its axial position, and the third mounting shaft hole (132) is sleeved on the outer periphery of the motor shaft (2); Along the axial direction, the first oil spray blade (1301) is adapted to block the oil inlet flow channel (122) of the first oil inlet blade (1201), and the second oil spray blade (1302) is adapted to block the oil inlet flow channel (122) of the second oil inlet blade (1202).

9. The motor rotor assembly according to claim 8, characterized in that, The first oil passage includes a third shaft hole (203) and a fourth shaft hole (204). The third shaft hole (203) is adapted to communicate with the annular oil passage groove (123) of the first oil inlet plate (1201), and the fourth shaft hole (204) is adapted to communicate with the annular oil passage groove (123) of the second oil inlet plate (1202).

10. An electric motor, characterized in that, include: Stator structure; And the motor rotor assembly as described in any one of claims 1 to 9 above.

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