Oil cooling rotor structure, motor and vehicle

Abstract

The invention relates to an oil cooling rotor structure, a motor and a vehicle, and belongs to the technical field of new energy vehicles. The oil cooling rotor structure comprises a rotating shaft and multiple sections of rotor iron cores, a first oil duct is arranged in the rotating shaft and is suitable for cooling oil to flow in, the multiple sections of rotor iron cores sequentially sleeve the rotating shaft in the axial direction of the rotating shaft, and each section of rotor iron core is provided with multiple second oil ducts and multiple third oil ducts. The plurality of second oil ducts and the plurality of third oil ducts are distributed around the rotating shaft, the mutually corresponding second oil ducts are mutually communicated, the mutually corresponding third oil ducts are mutually communicated, the third oil ducts are communicated with the second oil ducts, and the distance between the second oil ducts and the rotating shaft is smaller than the distance between the third oil ducts and the rotating shaft; and the plurality of second oil ducts of at least one rotor iron core are communicated with the first oil duct. According to the invention, effective cooling and heat dissipation of the oil cooling rotor structure can be realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of new energy vehicles, and in particular to an oil-cooled rotor structure, a motor and a vehicle. Background Art

[0002] The drive motor is one of the core components of new energy electric vehicles and some hybrid vehicles. The motor generates a lot of heat during operation, and the motor rotor is one of the main heat sources during the operation of the motor. In particular, the drive motors of new energy vehicles are mostly permanent magnet synchronous motors. When the motor runs in the high-speed zone, the heat generated by the motor rotor components increases sharply. If the rotor of the drive motor cannot be effectively cooled and cooled, it is easy to cause the motor to overheat, resulting in a decrease in the working efficiency of the motor, and may even cause the motor to burn out due to overheating. Summary of the invention

[0003] In view of this, the embodiments of the present disclosure provide an oil-cooled rotor structure, a motor and a vehicle, which can improve the efficiency of cooling and heat dissipation of the oil-cooled rotor structure. The technical solution is as follows:

[0004] In a first aspect, an oil-cooled rotor structure is provided, the oil-cooled rotor structure comprising a rotating shaft and a multi-section rotor core;

[0005] The rotating shaft has a first oil passage inside, and the first oil passage is suitable for cooling oil to flow into;

[0006] The multiple sections of the rotor core are sequentially sleeved on the rotating shaft along the axial direction of the rotating shaft, each section of the rotor core has a plurality of second oil passages and a plurality of third oil passages, the plurality of second oil passages and the plurality of third oil passages are distributed around the rotating shaft, and the second oil passages and the third oil passages penetrate the corresponding rotor core in a direction parallel to the axial direction of the rotating shaft;

[0007] The second oil passages of two adjacent sections of the rotor core correspond to each other, and the corresponding second oil passages are connected to each other; the third oil passages of two adjacent sections of the rotor core correspond to each other, and the corresponding third oil passages are connected to each other;

[0008] Among them, the third oil channel is connected to the second oil channel, and the distance between the second oil channel and the rotating shaft is smaller than the distance between the third oil channel and the rotating shaft, and multiple second oil channels of at least one of the rotor cores are connected to the first oil channel.

[0009] In a possible implementation, the oil-cooled rotor structure further includes a plurality of magnetic steels;

[0010] Each section of the rotor core has a plurality of magnetic steel slots, the magnetic steel slots penetrate the corresponding rotor core in a direction parallel to the axial direction of the rotating shaft, the plurality of magnetic steels are distributed around the rotating shaft, the magnetic steels correspond to the magnetic steel slots one by one, and are installed in the corresponding magnetic steel slots;

[0011] The magnetic steel groove corresponds to the second oil channel or the third oil channel one by one, and the gap between the groove wall of the magnetic steel groove and the magnetic steel becomes the corresponding second oil channel or the third oil channel.

[0012] In a possible implementation, the oil-cooled rotor structure further includes a carbon fiber wrapping layer;

[0013] The carbon fiber wrapping layer is wrapped around the circumferential surface of the multi-segment rotor core, and the carbon fiber wrapping layer becomes part of the slot wall of the magnetic steel slot;

[0014] The gap between the carbon fiber wrapping layer and the magnetic steel becomes the corresponding third oil channel.

[0015] In a possible implementation, each section of the rotor core has a plurality of weight-reducing holes, the weight-reducing holes penetrate the corresponding rotor core in a direction parallel to the axial direction of the rotating shaft, and the plurality of weight-reducing holes are distributed around the rotating shaft;

[0016] The weight-reducing holes of two adjacent sections of the rotor core correspond to each other, and the corresponding weight-reducing holes are connected to each other to form the second oil passage or the third oil passage.

[0017] In a possible implementation, the oil-cooled rotor structure also includes two annular baffles, which are fixedly mounted on the rotating shaft and respectively abut against the end surfaces of two sections of the rotor core located at both ends of the oil-cooled rotor structure that are away from each other, and the annular baffles overlap with the weight-reducing holes along the axial portion of the rotating shaft.

[0018] In a possible implementation, the overlapping area of ​​the annular baffle and the weight-reducing hole along the axial direction of the rotating shaft is smaller than two-thirds of the cross-sectional area of ​​the weight-reducing hole.

[0019] In a possible implementation, the oil-cooled rotor structure further includes a plurality of inter-segment baffles, the plurality of inter-segment baffles are sleeved on the rotating shaft, and the plurality of inter-segment baffles are respectively located between every two adjacent segments of the rotor core;

[0020] Each of the third oil passages of each section of the rotor core corresponds to the second oil passage;

[0021] The inter-segment baffle has a plurality of fourth oil passages, the plurality of fourth oil passages are distributed around the rotating shaft, the fourth oil passages correspond to the second oil passages of two adjacent segments of the rotor core one by one, the fourth oil passages are connected to the corresponding two second oil passages, and are connected to the third oil passages corresponding to the corresponding two second oil passages;

[0022] The plurality of fourth oil passages of at least one of the inter-segment baffles are all in communication with the first oil passage.

[0023] In a possible implementation, a first mounting hole is provided in the middle of the inter-segment baffle, and the inter-segment baffle is sleeved on the rotating shaft through the first mounting hole;

[0024] The first end of the fourth oil passage is connected to the first mounting hole, and the second end of the fourth oil passage extends in a direction away from the center of the first mounting hole and is connected to the corresponding two second oil passages, and is connected to the third oil passages corresponding to the corresponding two second oil passages;

[0025] The rotating shaft has a plurality of oil-swinging holes, each of which corresponds one-to-one to the fourth oil passage of at least one of the inter-segment baffles, a first end of each of the oil-swinging holes being connected to the first oil passage, and a second end of each of the oil-swinging holes being opposite to the first end of the corresponding fourth oil passage.

[0026] In a second aspect, a motor is provided, comprising an oil-cooled rotor structure as described in any one of the first aspects.

[0027] According to a third aspect, a vehicle is provided, comprising the motor as described in the second aspect.

[0028] In the scheme shown in the present disclosure, the cooling oil flowing in from the first oil channel can cool the rotating shaft. Moreover, since the multiple second oil channels of at least one rotor core are connected to the first oil channel, the cooling oil can flow into each second oil channel after flowing into the first oil channel, and after passing through each second oil channel of the multi-section rotor core in sequence, it flows out from both ends of the oil-cooled rotor structure. At the same time, since the third oil channel is connected to the second oil channel, and the distance between the second oil channel and the axis of the rotating shaft is less than the distance between the third oil channel and the axis of the rotating shaft. Therefore, during the high-speed rotation of the rotor, the cooling oil in the second oil channel can be thrown into the corresponding third oil channel, and after passing through each third oil channel of the multi-section rotor core in sequence, the cooling oil flows out from both ends of the oil-cooled rotor structure. In this way, by the flow of the cooling oil in the first oil channel, the second oil channel and the third oil channel, the heat in the rotating shaft and the rotor core can be taken away in time, thereby improving the efficiency of cooling and heat dissipation of the oil-cooled rotor structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a structural schematic diagram of an oil-cooled rotor structure provided by an embodiment of the present disclosure;

[0031] Figure 2 is a structural schematic diagram of an inter-segment baffle provided by an embodiment of the present disclosure;

[0032] Figure 3 is a schematic structural diagram of a rotor core provided by an embodiment of the present disclosure;

[0033] Figure 4 It is a structural schematic diagram of a rotating shaft provided in an embodiment of the present disclosure.

[0034] Description of Reference Numerals

[0035] 1. Rotating shaft; 11. First oil channel; 111. Oil inlet; 112. Oil outlet; 113. Oil collecting groove; 12. Oil throwing hole; 13. Shaft shoulder; 2. Rotor core; 21. Second oil channel; 22. Third oil channel; 23. Magnetic steel groove; 24. Second mounting hole; 3. Inter-segment baffle; 31. Fourth oil channel; 32. First mounting hole; 33. Fifth oil channel; 4. Magnetic steel; 5. Carbon fiber wrapping layer; 6. Annular baffle. DETAILED DESCRIPTION

[0036] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0037] This embodiment relates to an oil-cooled rotor structure, such as Figure 1 The diagram shows the structure of the oil-cooled rotor. Figure 2 The structure diagram of the inter-stage baffle 3 is shown in FIG. Figure 3 The structure diagram of the rotor core 2 is shown in FIG. Figure 4 Shown is a schematic structural diagram of the rotating shaft 1.

[0038] refer to Figure 1 As shown, the oil-cooled rotor structure includes a rotating shaft 1 and a rotor core 2. The rotating shaft 1 has a first oil passage 11 inside, and the first oil passage 11 is suitable for cooling oil to flow in. In addition, the rotor core 2 may include multiple sections, and the multiple sections of the rotor core 2 are sequentially sleeved on the rotating shaft 1 along the axial direction of the rotating shaft 1.

[0039] For example, the rotor core 2 may include Figure 1The six sections shown may also include four sections, or eight sections, etc. In this embodiment, the oil-cooled rotor structure includes six sections of rotor cores 2 as an example. The six sections of rotor cores 2 are sequentially sleeved on the rotating shaft 1 along the axial direction of the rotating shaft 1.

[0040] refer to Figure 3 As shown, each section of the rotor core 2 has a plurality of second oil passages 21 and a plurality of third oil passages 22 , and the plurality of second oil passages 21 and the plurality of third oil passages 22 are distributed around the rotating shaft 1 .

[0041] For example, each rotor core 2 may have Figure 3 The eight second oil passages 21 and thirty-two third oil passages 22 are shown. However, the number of second oil passages 21 in each rotor core section 2 may be ten, twelve, fourteen, etc., and the number of second oil passages 21 in each rotor core section 2 may be forty, sixteen, twenty, etc.

[0042] Furthermore, the number of the second oil passages 21 and the number of the third oil passages 22 in each section of the rotor core 2 may be the same. For example, the number of the second oil passages 21 and the number of the third oil passages 22 in each section of the rotor core 2 may be sixteen, twenty, twenty-four, or the like.

[0043] The number of the second oil passages 21 and the third oil passages 22 of each section of the rotor core 2 may also be different. For example, the number of the third oil passages 22 may be twice, four times, or half of the number of the second oil passages 21. Figure 3 As an example, the number of the second oil passages 21 is eight, and the number of the third oil passages 22 is thirty-two. Thus, the number of the third oil passages 22 is four times that of the second oil passages 21 .

[0044] Continue to refer Figure 1 As shown, the second oil passage 21 and the third oil passage 22 both penetrate the corresponding rotor core 2 in a direction parallel to the axial direction of the rotating shaft 1 .

[0045] The second oil passages 21 of two adjacent sections of the rotor core 2 correspond to each other, and the corresponding second oil passages 21 are connected to each other. The third oil passages 22 of two adjacent sections of the rotor core 2 correspond to each other, and the corresponding third oil passages 22 are connected to each other.

[0046] Among them, continue to refer to Figure 1 As shown, the third oil passage 22 is connected to the second oil passage 21, and the distance between the second oil passage 21 and the shaft 1 is smaller than the distance between the third oil passage 22 and the shaft 1. In addition, the plurality of second oil passages 21 of at least one rotor core 2 are all connected to the first oil passage 11.

[0047] For example, Figure 1In the embodiment, the multiple second oil passages 21 of the third rotor core 2 and the multiple second oil passages 21 of the fourth rotor core 2 from left to right may be connected to the first oil passage 11, but the multiple second oil passages 21 of the second rotor core 2 from left to right may be connected to the first oil passage 11, or the multiple second oil passages 21 of the first rotor core 2 and the multiple second oil passages 21 of the fourth rotor core 2 from left to right may be connected to the first oil passage 11.

[0048] As can be seen from the above, the cooling oil flowing in from the first oil passage 11 can cool the rotating shaft 1. Moreover, since the multiple second oil passages 21 of at least one rotor core 2 are connected to the first oil passage 11, the cooling oil can flow into each second oil passage 21 after flowing into the first oil passage 11, and after passing through each second oil passage 21 of the multiple sections of the rotor core 2 in sequence, it flows out from both ends of the oil-cooled rotor structure.

[0049] At the same time, since the third oil passage 22 is connected to the second oil passage 21, and the distance between the second oil passage 21 and the axis of the rotating shaft 1 is smaller than the distance between the third oil passage 22 and the axis of the rotating shaft 1, during the high-speed rotation of the rotor, the cooling oil in the second oil passage 21 can be thrown into the corresponding third oil passage 22, and after passing through the third oil passages 22 of the multi-section rotor core 2 in sequence, the cooling oil flows out from both ends of the oil-cooled rotor structure.

[0050] In this way, the heat in the shaft 1 and the rotor core 2 can be promptly removed by the cooling oil flowing in the first oil channel 11, the second oil channel 21 and the third oil channel 22, thereby improving the cooling and heat dissipation efficiency of the oil-cooled rotor structure.

[0051] In one example, reference Figure 3 As shown, the oil-cooled rotor structure also includes a plurality of magnetic steels 4. Each section of the rotor core 2 has a plurality of magnetic steel slots 23, for example Figure 3 In the embodiment, each rotor core 2 may have thirty-two magnetic steel slots 23, but may also have sixteen magnetic steel slots 23, or may also have twenty magnetic steel slots 23, etc.

[0052] The magnetic steel slot 23 penetrates the corresponding rotor core 2 in a direction parallel to the axial direction of the rotating shaft 1, and Figure 3 As shown, thirty-two magnetic steels 4 can be distributed around the rotating shaft 1, and the magnetic steels 4 correspond to the magnetic steel slots 23 one by one, and are installed in the corresponding magnetic steel slots 23. In this embodiment, taking each section of the rotor core 2 having thirty-two magnetic steel slots 23 as an example, the number of magnetic steels 4 can be thirty-two, and each steel 4 can be fixedly installed in the corresponding magnetic steel slot 23 by means of glue injection or injection molding.

[0053] The magnetic steel groove 23 corresponds to the second oil passage 21 or the third oil passage 22 one by one, and the gap between the groove wall of the magnetic steel groove 23 and the magnetic steel 4 becomes the corresponding second oil passage 21 or the third oil passage 22 .

[0054] For example, Figure 3 In the embodiment, the magnetic steel groove 23 corresponds to the third oil passage 22 one by one, and the gap between the groove wall of the magnetic steel groove 23 and the magnetic steel 4 becomes the corresponding third oil passage 22. However, it can also be that the magnetic steel groove 23 corresponds to the second oil passage 21 one by one, and the gap between the groove wall of the magnetic steel groove 23 and the magnetic steel 4 becomes the corresponding second oil passage 21.

[0055] In this way, the cooling oil flowing through the second oil passage 21 or the third oil passage 22 can directly contact the magnetic steel 4 and directly cool the magnetic steel 4, thereby greatly improving the efficiency of cooling and dissipating heat of the oil-cooled rotor structure.

[0056] In one example, reference Figure 1 and Figure 3 As shown, in order to prevent the oil-cooled rotor structure from being damaged due to centrifugal force when rotating at high speed, the oil-cooled rotor structure also includes a carbon fiber wrapping layer 5. The carbon fiber wrapping layer 5 is wrapped outside the circumferential surface of the multi-segment rotor core 2, and the carbon fiber wrapping layer 5 becomes part of the slot wall of the magnetic steel slot 23. The gap between the carbon fiber wrapping layer 5 and the magnetic steel 4 becomes the corresponding third oil passage 22. As shown in Example 1, the carbon fiber wrapping layer 5 can be wrapped outside the circumferential surface of the six-segment rotor core 2.

[0057] In this way, the carbon fiber wrapping layer 5 is used to wrap the circumferential surface of the rotor core 2, and the carbon fiber wrapping layer 5 can generate pre-pressure on the rotor core 2. When the rotor core 2 rotates at a high speed, the pre-pressure is balanced with the centrifugal force, which can prevent the deformation of the rotor core 2 and the swing of the magnetic steel 4 in the radial direction to resist the centrifugal force, and further, when the oil-cooled rotor structure rotates at a high speed, it can still avoid damage due to the centrifugal force, thereby increasing the maximum speed of the oil-cooled rotor structure.

[0058] At the same time, since the third oil channel 22 is in direct contact with the carbon fiber wrapping layer 5, the magnetic steel 4 and the rotor core 2, the carbon fiber wrapping layer 5, the magnetic steel 4 and the rotor core 2 can be directly cooled, thereby greatly improving the efficiency of cooling and heat dissipation of the oil-cooled rotor structure.

[0059] In one example, continue to refer to Figure 1 and Figure 3 As shown, each section of the rotor core 2 has a plurality of weight-reducing holes, for example, Figure 3 In the embodiment, the number of weight-reducing holes in each section of the rotor core 2 may be eight, but may also be six, ten, etc.

[0060] In this embodiment, each section of the rotor core 2 has a weight-reducing hole such as Figure 3The eight weight-reducing holes are shown as an example. The weight-reducing holes penetrate the corresponding rotor core 2 in a direction parallel to the axial direction of the rotating shaft 1. The eight weight-reducing holes are evenly distributed around the rotating shaft 1. The weight-reducing holes of two adjacent sections of the rotor core 2 correspond to each other, and the corresponding weight-reducing holes are connected to each other to form the second oil passage 21 or the third oil passage 22.

[0061] For example, Figure 3 In the embodiment, the corresponding lightening holes are connected to each other to form the second oil passage 21 , but the corresponding lightening holes may also be connected to each other to form the third oil passage 22 .

[0062] In this way, the second oil passage 21 or the third oil passage 22 is formed through the weight-reducing hole of the rotor core 2, which can reduce the difficulty of manufacturing the rotor core 2 and improve the cooling and heat dissipation effect on the rotor core 2 during manufacturing of the rotor core 2.

[0063] In one example, reference Figure 1 and Figure 4 As shown, the oil-cooled rotor structure further includes two annular baffles 6, which are fixedly sleeved on the rotating shaft 1 and respectively abut against the end surfaces of two sections of the rotor core 2 located at both ends of the oil-cooled rotor structure that are away from each other.

[0064] For example, the first end of the rotating shaft 1 may have a shaft shoulder 13 , the first annular baffle 6 may be clearance-fitted with the rotating shaft 1 , the second annular baffle 6 may be interference-fitted with the rotating shaft 1 , and the rotor core 2 may have a second mounting hole 24 .

[0065] When assembling the oil-cooled rotor structure, the first annular baffle 6 can be sleeved and assembled on the rotating shaft 1 from the second end of the rotating shaft 1, and moved toward the first end of the rotating shaft 1 until the first pressing ring 5 abuts against the shaft shoulder 13. Then, each section of the rotor core 2 is sleeved and assembled on the rotating shaft 1 through the second mounting hole 24 in sequence, and moved toward the first end of the rotating shaft 1 until it cannot move. Then, the heated second annular baffle 6 is sleeved and assembled on the rotating shaft 1 from the second end of the rotating shaft 1, and moved toward the first end of the rotating shaft 1 until the annular baffle 6 abuts against the rotor core 2, and then the press is maintained for a period of time until the second annular baffle 6 cools and has an interference fit with the rotating shaft 1.

[0066] The annular baffle 6 partially overlaps the weight-reducing hole along the axial direction of the rotating shaft 1. For example, the outer diameter of the annular baffle 6 is smaller than the maximum distance between the weight-reducing hole and the axis of the rotating shaft 1, and larger than the minimum distance between the weight-reducing hole and the axis of the rotating shaft 1.

[0067] In this way, the annular baffle 6 can block the cooling oil flowing out of the weight reduction holes and limit the speed at which the cooling oil flows out of the oil-cooled rotor structure through the weight reduction holes to a certain extent, thereby helping the cooling oil to fill the weight reduction holes and fully contact the rotor core 2, thereby improving the efficiency of cooling and heat dissipation of the oil-cooled rotor structure.

[0068] In one example, the area where the annular baffle 6 overlaps with the axial portion of the weight-reducing hole along the rotating shaft 1 is less than two-thirds of the area of ​​the cross section of the weight-reducing hole. For example, the area where the annular baffle 6 overlaps with the axial portion of the weight-reducing hole along the rotating shaft 1 may be one-half, one-third, or two-fifths of the area of ​​the cross section of the weight-reducing hole. Thus, the annular baffle 6 can be prevented from affecting the normal outflow of cooling oil from the weight-reducing hole.

[0069] In one example, reference Figure 1 Combined with Figure 2 and Figure 3 As shown, the oil-cooled rotor structure further includes a plurality of inter-segment baffles 3, which are sleeved on the rotating shaft 1 and are respectively located between every two adjacent rotor cores 2. Figure 1 As shown, the rotor core 2 may have six sections, the number of the inter-segment baffles 3 may be five, and the five inter-segment baffles 3 may be respectively located between every two adjacent sections of the rotor core 2 .

[0070] Among them, each third oil channel 22 of each section of the rotor core 2 corresponds to the second oil channel 21, the inter-segment baffle 3 has a plurality of fourth oil channels 31, and the plurality of fourth oil channels 31 are distributed around the rotating shaft 1. The fourth oil channels 31 correspond one-to-one to the second oil channels 21 of two adjacent sections of the rotor core 2. The fourth oil channel 31 is connected to the corresponding two second oil channels 21, and is connected to the third oil channels 22 corresponding to the corresponding two second oil channels 21.

[0071] In this embodiment, Figure 2 Taking the example that each section of the rotor core 2 has eight second oil passages 21 , the inter-segment baffle 3 can have eight fourth oil passages 31 , and the eight fourth oil passages 31 are respectively connected to the corresponding two second oil passages 21 , and are connected to the third oil passages 22 corresponding to the corresponding two second oil passages 21 .

[0072] Furthermore, the plurality of fourth oil passages 31 of at least one inter-stage baffle 3 are all connected to the first oil passage 11. Figure 1 In the figure, the eight fourth oil passages 31 of the inter-segment baffle 3 located between the third rotor core 2 and the fourth rotor core 2 from left to right are all connected to the first oil passage 11. However, the eight fourth oil passages 31 of two, three, or all inter-segment baffles 3 may be connected to the first oil passage 11.

[0073] In this way, the first oil passage 11 , the second oil passage 21 and the third oil passage 22 can be connected through the fourth oil passage 31 of the inter-segment baffle 3 . The inter-segment baffle 3 is easy to produce and process, and no unnecessary processing is required on the rotor core 2 .

[0074] In one example, continue to refer to Figure 1 As shown, the end of the magnetic steel 4 abuts against the adjacent inter-segment baffle 3. Thus, the inter-segment baffle 3 can limit the possible axial movement of the magnetic steel 4, thereby effectively reducing the axial force.

[0075] In one example, continue to refer to Figure 3 As shown, the middle portion of the inter-segment baffle 3 has a first mounting hole 32 , the inter-segment baffle 3 is sleeved on the rotating shaft 1 through the first mounting hole 32 , and the first end of the fourth oil passage 31 is connected to the first mounting hole 32 .

[0076] Furthermore, the second end of the fourth oil passage 31 extends in a direction away from the center of the first mounting hole 32 and is connected to the corresponding two second oil passages 21 and to the third oil passages 22 corresponding to the corresponding two second oil passages 21 .

[0077] For example Figure 2 As shown, the second end of the fourth oil passage 31 has a fifth oil passage 33 connected to the fourth oil passage 31, and the fifth oil passage 33 extends along the circumference of the rotor core 2, so that the second end of the fourth oil passage 31 can be connected to the corresponding two second oil passages 21, and connected to the third oil passages 22 corresponding to the corresponding two second oil passages 21 through the fifth oil passage 33.

[0078] The rotating shaft 1 has multiple oil-swinging holes 12, which correspond one-to-one to the fourth oil passages 31 of the N inter-segment baffles 3. The first end of the oil-swinging hole 12 is connected to the first oil passage 11, and the second end of the oil-swinging hole 12 is opposite to the first end of the corresponding fourth oil passage 31, so that the cooling oil in the oil-swinging hole 12 can enter the fourth oil passage 31.

[0079] Furthermore, N is smaller than the number of the inter-segment baffles 3 . For example, when the number of the inter-segment baffles 3 is five, N may be one, two, three or four.

[0080] In this embodiment, Figure 1 Taking the example that the eight fourth oil passages 31 of the inter-segment baffle 3 located between the third rotor core 2 and the fourth rotor core 2 from left to right are all connected to the first oil passage 11, the rotating shaft 1 can have eight oil-slinging holes 12, which are respectively opposite to the eight corresponding fourth oil passages 31.

[0081] As described above, since N is less than the number of the inter-segment baffles 3, the first end of the fourth oil channel 31 of some of the inter-segment baffles 3 will be directly connected to the outer surface of the rotating shaft 1. Therefore, the oil in the fourth oil channel 31 can flow directly from the first end of the fourth oil channel 31 to the outer surface of the rotating shaft 1, and directly cool the outer surface of the rotating shaft 1, thereby further improving the efficiency of cooling and heat dissipation.

[0082] In one example, the first oil passage 11 extends along the axial direction of the rotating shaft 1, and the first end of the first oil passage 11 has an oil inlet 111, and the second end of the first oil passage 11 has an oil outlet 112, so that cooling oil can enter the first oil passage 11 from the oil inlet 111 and flow out of the first oil passage 11 from the oil outlet 112. In this way, the first oil passage 11 can flow along the axial interior of the entire rotating shaft 1 and realize cooling of the entire axial interior of the rotating shaft 1.

[0083] In one example, the cross-sectional area of ​​the oil outlet 112 is smaller than the cross-sectional area of ​​the oil inlet 111, so that after the cooling oil enters the first oil channel 11, it can fill the first oil channel 11, thereby achieving sufficient cooling of the interior of the rotating shaft 1, thereby improving the efficiency of cooling and heat dissipation of the oil-cooled rotor structure.

[0084] In an example, the oil outlet 112 extends to the rotor bearing, so that the cooling oil can flow from the oil outlet 112 to the rotor bearing, thereby cooling and lubricating the rotor bearing by the cooling oil.

[0085] In one example, the first oil channel 11 also has an annular oil collecting groove 113 surrounding the axis of the first oil channel 11, and the first end of the oil-slinging hole 12 is connected to the oil collecting groove 113, so as to be connected with the first oil channel 11 through the oil collecting groove 113. The cooling oil can be gathered in the oil collecting groove 113 through the oil collecting groove 113, which is beneficial for the cooling oil to flow from the first oil channel 11 to the oil-slinging hole 12.

[0086] In the disclosed embodiment, the cooling oil flowing in from the first oil passage 11 can cool the rotating shaft 1. Furthermore, since the plurality of second oil passages 21 of at least one rotor core 2 are connected to the first oil passage 11, the cooling oil can flow into each of the second oil passages 21 after flowing into the first oil passage 11, and after passing through each of the second oil passages 21 of the multi-section rotor core 2 in sequence, it flows out from both ends of the oil-cooled rotor structure.

[0087] At the same time, since the third oil passage 22 is connected to the second oil passage 21, and the distance between the second oil passage 21 and the axis of the rotating shaft 1 is smaller than the distance between the third oil passage 22 and the axis of the rotating shaft 1, during the high-speed rotation of the rotor, the cooling oil in the second oil passage 21 can be thrown into the corresponding third oil passage 22, and after passing through the third oil passages 22 of the multi-section rotor core 2 in sequence, the cooling oil flows out from both ends of the oil-cooled rotor structure.

[0088] In this way, the heat in the shaft 1 and the rotor core 2 can be promptly removed by the cooling oil flowing in the first oil channel 11, the second oil channel 21 and the third oil channel 22, thereby improving the cooling and heat dissipation efficiency of the oil-cooled rotor structure.

[0089] This embodiment also provides a motor, which includes an oil-cooled rotor structure as described in any one of the first aspects.

[0090] In the disclosed embodiment, the cooling oil flowing in from the first oil passage 11 can cool the rotating shaft 1. Furthermore, since the plurality of second oil passages 21 of at least one rotor core 2 are connected to the first oil passage 11, the cooling oil can flow into each of the second oil passages 21 after flowing into the first oil passage 11, and after passing through each of the second oil passages 21 of the multi-section rotor core 2 in sequence, it flows out from both ends of the oil-cooled rotor structure.

[0091] At the same time, since the third oil passage 22 is connected to the second oil passage 21, and the distance between the second oil passage 21 and the axis of the rotating shaft 1 is smaller than the distance between the third oil passage 22 and the axis of the rotating shaft 1, during the high-speed rotation of the rotor, the cooling oil in the second oil passage 21 can be thrown into the corresponding third oil passage 22, and after passing through the third oil passages 22 of the multi-section rotor core 2 in sequence, the cooling oil flows out from both ends of the oil-cooled rotor structure.

[0092] In this way, the heat in the shaft 1 and the rotor core 2 can be promptly removed by the cooling oil flowing in the first oil channel 11, the second oil channel 21 and the third oil channel 22, thereby improving the cooling and heat dissipation efficiency of the oil-cooled rotor structure.

[0093] This embodiment also provides a vehicle, the vehicle comprising the motor as described in the second aspect.

[0094] In the disclosed embodiment, the cooling oil flowing in from the first oil passage 11 can cool the rotating shaft 1. Furthermore, since the plurality of second oil passages 21 of at least one rotor core 2 are connected to the first oil passage 11, the cooling oil can flow into each of the second oil passages 21 after flowing into the first oil passage 11, and after passing through each of the second oil passages 21 of the multi-section rotor core 2 in sequence, it flows out from both ends of the oil-cooled rotor structure.

[0095] At the same time, since the third oil passage 22 is connected to the second oil passage 21, and the distance between the second oil passage 21 and the axis of the rotating shaft 1 is smaller than the distance between the third oil passage 22 and the axis of the rotating shaft 1, during the high-speed rotation of the rotor, the cooling oil in the second oil passage 21 can be thrown into the corresponding third oil passage 22, and after passing through the third oil passages 22 of the multi-section rotor core 2 in sequence, the cooling oil flows out from both ends of the oil-cooled rotor structure.

[0096] In this way, the heat in the shaft 1 and the rotor core 2 can be promptly removed by the cooling oil flowing in the first oil channel 11, the second oil channel 21 and the third oil channel 22, thereby improving the cooling and heat dissipation efficiency of the oil-cooled rotor structure.

[0097] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present disclosure can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0098] The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. An oil-cooled rotor structure, characterized in that: The oil-cooled rotor structure comprises a rotating shaft (1) and a multi-section rotor iron core (2); The rotating shaft (1) has a first oil passage (11) inside, and the first oil passage (11) is suitable for cooling oil to flow into; The multiple sections of the rotor core (2) are sequentially sleeved on the rotating shaft (1) along the axial direction of the rotating shaft (1), each section of the rotor core (2) has a plurality of second oil passages (21) and a plurality of third oil passages (22), the plurality of second oil passages (21) and the plurality of third oil passages (22) are both distributed around the rotating shaft (1), and the second oil passages (21) and the third oil passages (22) both penetrate the corresponding rotor core (2) in a direction parallel to the axial direction of the rotating shaft (1); The second oil passages (21) of two adjacent sections of the rotor core (2) correspond one to one, and the corresponding second oil passages (21) are connected to each other; the third oil passages (22) of two adjacent sections of the rotor core (2) correspond one to one, and the corresponding third oil passages (22) are connected to each other; The third oil passage (22) is connected to the second oil passage (21), and the distance between the second oil passage (21) and the rotating shaft (1) is smaller than the distance between the third oil passage (22) and the rotating shaft (1), and the plurality of second oil passages (21) of at least one of the rotor cores (2) are all connected to the first oil passage (11).

2. The oil-cooled rotor structure according to claim 1, characterized in that: The oil-cooled rotor structure also includes a plurality of magnetic steels (4); Each section of the rotor core (2) has a plurality of magnetic steel slots (23), the magnetic steel slots (23) penetrate the corresponding rotor core (2) in a direction parallel to the axial direction of the rotating shaft (1), the plurality of magnetic steels (4) are distributed around the rotating shaft (1), the magnetic steels (4) correspond to the magnetic steel slots (23) one by one, and are installed in the corresponding magnetic steel slots (23); The magnetic steel groove (23) corresponds one-to-one to the second oil channel (21) or the third oil channel (22), and the gap between the groove wall of the magnetic steel groove (23) and the magnetic steel (4) becomes the corresponding second oil channel (21) or the third oil channel (22).

3. The oil-cooled rotor structure according to claim 2, characterized in that: The oil-cooled rotor structure also includes a carbon fiber wrapping layer (5); The carbon fiber wrapping layer (5) is wrapped around the circumferential surface of the multi-segment rotor core (2), and the carbon fiber wrapping layer (5) becomes part of the slot wall of the magnetic steel slot (23); The gap between the carbon fiber wrapping layer (5) and the magnetic steel (4) becomes the corresponding third oil passage (22).

4. The oil-cooled rotor structure according to claim 1, characterized in that: Each section of the rotor core (2) has a plurality of weight-reducing holes, the weight-reducing holes penetrate the corresponding rotor core (2) in a direction parallel to the axial direction of the rotating shaft (1), and the plurality of weight-reducing holes are distributed around the rotating shaft (1); The weight-reducing holes of two adjacent sections of the rotor core (2) correspond to each other, and the corresponding weight-reducing holes are interconnected to form the second oil passage (21) or the third oil passage (22).

5. The oil-cooled rotor structure according to claim 4, characterized in that: The oil-cooled rotor structure also includes two annular baffles (6), each of which is fixedly mounted on the rotating shaft (1) and respectively abuts against end surfaces of two sections of the rotor core (2) located at two ends of the oil-cooled rotor structure that are away from each other, and the annular baffles (6) overlap with the weight-reducing holes along the axial portion of the rotating shaft (1).

6. The oil-cooled rotor structure according to claim 5, characterized in that: The area of ​​the annular baffle (6) overlapping the axial portion of the weight-reducing hole along the rotating shaft (1) is less than two-thirds of the cross-sectional area of ​​the weight-reducing hole.

7. The oil-cooled rotor structure according to claim 1, characterized in that: The oil-cooled rotor structure further comprises a plurality of inter-segment baffles (3), wherein the plurality of inter-segment baffles (3) are sleeved on the rotating shaft (1), and the plurality of inter-segment baffles (3) are respectively located between each two adjacent segments of the rotor core (2); Each of the third oil passages (22) of each section of the rotor core (2) corresponds to the second oil passage (21); The inter-segment baffle (3) has a plurality of fourth oil passages (31), the plurality of fourth oil passages (31) are distributed around the rotating shaft (1), the fourth oil passages (31) correspond one-to-one to the second oil passages (21) of two adjacent segments of the rotor core (2), the fourth oil passage (31) is connected to the corresponding two second oil passages (21), and is connected to the third oil passages (22) corresponding to the corresponding two second oil passages (21); The plurality of fourth oil passages (31) of at least one of the inter-segment baffles (3) are all in communication with the first oil passage (11).

8. The oil-cooled rotor structure according to claim 7, characterized in that: The middle portion of the inter-segment baffle (3) is provided with a first mounting hole (32), and the inter-segment baffle (3) is sleeved on the rotating shaft (1) through the first mounting hole (32); The first end of the fourth oil passage (31) is connected to the first mounting hole (32), and the second end of the fourth oil passage (31) extends in a direction away from the center of the first mounting hole (32) and is connected to the corresponding two second oil passages (21), and is connected to the third oil passages (22) corresponding to the corresponding two second oil passages (21); The rotating shaft (1) has a plurality of oil-slinging holes (12), each of the oil-slinging holes (12) corresponding to the fourth oil passages (31) of the N inter-section baffles (3) one by one, a first end of each of the oil-slinging holes (12) being connected to the first oil passage (11), and a second end of each of the oil-slinging holes (12) being opposite to a first end of the corresponding fourth oil passage (31); Wherein, N is smaller than the number of inter-segment baffles (3).

9. A motor, characterized in that: The motor comprises an oil-cooled rotor structure as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle comprises the electric machine as claimed in claim 9.

Images