Rotor shaft, motor and vehicle

Abstract

The invention provides a rotor shaft, a motor and a vehicle, the rotor shaft comprises a rotating shaft body and a drainage core, one end of the rotating shaft body is provided with an oil inlet, the rotating shaft body is internally provided with a cooling oil hole channel extending along the axial direction, one end, close to the oil inlet, of the hole wall of the rotating shaft body is provided with a first oil outlet, and one end, far away from the oil inlet, of the hole wall of the rotating shaft body is provided with a second oil outlet; the drainage core is located in the cooling oil hole channel and comprises a core body main section and a drainage section formed by extending from the core body main section, the drainage section is arranged at the end close to the oil inlet, a first containing cavity is formed between the drainage section and the oil inlet, and the drainage section is provided with a first flow channel and a second flow channel which are arranged at intervals in the circumferential direction. The first flow channel extends from the drainage section to the first oil outlet, and the second flow channel extends from the drainage section to the second oil outlet. The cooling efficiency of the vehicle gearbox motor can be improved, and the fault rate of the motor can be reduced.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a rotor shaft, a motor and a vehicle. Background Art

[0002] With the rapid development of new energy vehicles, hybrid transmissions are also developing towards high power, high speed and low noise. The maximum speed of the hybrid transmission motor can reach 20,000 rpm+. In order to match the high speed and high power requirements of the hybrid transmission, the speed of the motor, gears and bearings must also be designed and used for efficient cooling, which makes the cooling structure of the motor rotor shaft particularly critical.

[0003] The cooling structure of the existing motor rotor shaft is mostly a hollow main oil channel inside the motor rotor shaft. One end of the hollow main oil channel is open as an oil inlet, and the other end of the hollow main oil channel is an open or closed structure counter-position end. One or several circles of oil-slinging holes are respectively provided at both ends of the hollow main oil channel. The oil-slinging holes penetrate the inside and outside of the rotor shaft, and the number is 2n or 3n, and the oil-slinging holes at both ends are staggered on the circumference. The cooling oil is injected into the hollow main oil channel axially along the oil inlet. With the initial injection velocity, it flows from the oil inlet to the counter-position end. With the high-speed rotation of the rotor shaft, due to the action of centrifugal force, the cooling oil will be thrown onto the inner wall of the hollow main oil channel. The movement trajectory of the cooling oil is a unidirectional spiral. When the cooling oil flows to the oil-slinging hole, it is thrown out of the rotor shaft by the centrifugal force for stator winding cooling or rotor core cooling. Therefore, the cooling structure of the existing motor rotor shaft will have the following two undesirable conditions: First, when the cooling oil injection flow is low and the motor speed is high, due to the low cooling oil injection flow and low linear speed, the cooling oil falls on the inner wall of the hollow main oil channel close to the oil inlet oil-slinging hole. At the same time, with the high motor speed, the amount of cooling oil thrown out is large, and the hollow main oil channel will not be filled. As a result, more cooling oil is thrown out by the oil inlet oil-slinging hole, and less cooling oil flows to the oil-slinging hole at the positioning end, causing rotation imbalance at both ends of the motor rotor and cooling imbalance at both ends of the motor.

[0004] Second, when the cooling oil injection flow rate is high and the motor speed is high, the cooling oil injection flow rate is high, the linear speed is high, and the cooling oil falls on the inner wall of the hollow main oil channel behind the oil-slinging hole at the oil inlet. At the same time, with the high motor speed, the amount of cooling oil thrown out is large, and the hollow main oil channel will not be filled. As a result, more cooling oil is thrown out by the oil-slinging hole at the positioning end, and less or no cooling oil flows to the oil-slinging hole position at the oil inlet, causing rotation imbalance at both ends of the motor rotor and cooling imbalance at both ends of the motor. Summary of the invention

[0005] The present application provides a rotor shaft, a motor and a vehicle, which can solve the problems of rotation imbalance at both ends of the motor rotor and cooling imbalance at both ends of the motor of a new energy vehicle, improve the cooling efficiency of the vehicle gearbox motor and reduce the motor failure rate.

[0006] The present application provides a rotor shaft, comprising a shaft body and a guide core, wherein an oil inlet is provided at one end of the shaft body, a cooling oil channel extending in an axial direction is provided in the shaft body, a first oil outlet is provided at one end of a hole wall of the shaft body close to the oil inlet, and a second oil outlet is provided at one end of the hole wall of the shaft body away from the oil inlet; The guide core is located in the cooling oil channel, and the guide core includes a core main section and a guide section extending from the core main section. The guide section is arranged at one end close to the oil inlet, and a first accommodating cavity is formed between the guide section and the oil inlet; The drainage section is provided with a first flow channel and a second flow channel spaced apart along the circumferential direction, wherein the first flow channel extends from the drainage section to the first oil outlet; and the second flow channel extends from the drainage section to the second oil outlet.

[0007] In one embodiment, the first accommodating cavity is formed by interference fit between a portion of the drainage section and the cooling oil channel.

[0008] In one embodiment, the core main section includes a clearance section and an interference fit section which are sequentially connected to the drainage section, and the interference fit section is interference-mounted at one end of the cooling oil channel close to the second oil outlet.

[0009] In one embodiment, the air avoidance section is arranged in the middle portion of the core main section; the length of the air avoidance section is greater than the sum of the interference fit section and the drainage section.

[0010] In one embodiment, the first flow channel and the second flow channel are groove structures arranged on the surface of the guide core; the cross-sectional dimensions of the first flow channel and the second flow channel are consistent.

[0011] In one embodiment, the drainage section is a conical structure with a taper of 30° to 80°.

[0012] In one embodiment, the first oil outlet and the second oil outlet vertically penetrate the shaft body and are connected to the cooling oil channel.

[0013] In one embodiment, the first oil outlet and the second oil outlet are spaced apart in the axial direction of the shaft body and intersect each other in the radial projection of the shaft body; The shaft body is provided with at least two first oil outlets and at least two second oil outlets; the diversion section is provided with at least two first flow channels and the second flow channels; the first flow channel corresponds to the first oil outlet; the second flow channel corresponds to the second oil outlet.

[0014] The present application also provides a motor, which includes the above-mentioned rotor shaft.

[0015] The present application also provides a vehicle, wherein the vehicle comprises the above-mentioned motor.

[0016] After adopting the above technical solution, the beneficial effects are: The present application provides a rotor shaft, a motor and a vehicle, wherein a cooling oil channel provided inside the rotor shaft structure is provided with a flow guide core, so that the cooling oil can flow to the first oil outlet and the second oil outlet correspondingly along the first flow channel and the second flow channel provided on the surface of the flow guide section at the front end of the flow guide core. During the flow of the cooling oil, the first flow channel and the second flow channel formed by extending from the flow guide section are arranged at intervals, which forms the prerequisite for limiting and distributing the cooling oil flowing in from the flow guide section and the oil inlet of the cooling oil channel. At the same time, the matching structural state of the drainage section and the cooling oil channel makes the drainage section of the drainage core and the cooling oil channel form a local closed state condition, that is, the first flow channel and the second flow channel located in the drainage section can be isolated from each other and form a closed cavity with the cooling oil channel, which also makes the cooling oil flowing out of the first oil outlet and the second oil outlet generate negative pressure in the process of flowing in the first flow channel and the second flow channel. This negative pressure forms a suction force to continuously lead the cooling oil to flow out of the first oil outlet and the second oil outlet, and a first accommodating chamber is formed between the drainage section and the oil inlet, and the cooling oil entering the first accommodating chamber can accumulate and accumulate potential, so that under the joint action of the negative pressure and the cooling oil injection pressure, the cooling oil continuously flows, and finally the amount of cooling oil flowing out of the first oil outlet and the second oil outlet is consistent, ensuring the balanced rotation of the motor rotor, thereby solving the problems of rotation imbalance at both ends of the existing motor rotor and cooling imbalance at both ends of the motor, which can improve the cooling efficiency of the vehicle gearbox motor and reduce the motor failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a rotor shaft provided in an embodiment of the present application.

[0019] Figure 2 A schematic diagram of the exploded structure of a rotating shaft body of a rotor shaft provided in an embodiment of the present application.

[0020] Figure 3 A schematic diagram of the cross-sectional structure of a rotating shaft body of a rotor shaft provided in an embodiment of the present application.

[0021] Figure 4 A schematic diagram of the structure of a flow guide core of a rotor shaft provided in an embodiment of the present application.

[0022] Figure 5 A schematic diagram of the cross-sectional structure of a flow guide core of a rotor shaft provided in an embodiment of the present application.

[0023] Figure 6 A schematic diagram of the structure of a motor rotor of a rotor shaft provided in an embodiment of the present application.

[0024] Figure 7 A schematic diagram of a cooling oil flow path of a rotating shaft body of a rotor shaft provided in an embodiment of the present application.

[0025] Reference numerals: 100- rotor shaft; 10-shaft body; 11-oil inlet; 12-cooling oil channel; 122-alignment end; 13-first oil outlet; 15-second oil outlet; 20- drainage core; 21- core main section; 211- air avoidance section; 212- interference fit section; 22- drainage section; 23- first flow channel; 25- second flow channel; 30- first accommodating chamber; 50- Second accommodating chamber. DETAILED DESCRIPTION

[0026] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0027] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0028] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0029] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0030] With the rapid development of new energy vehicles, the cooling structure of the motor rotor has become particularly critical. In order to solve the problem of rotation imbalance at both ends of the motor rotor and cooling imbalance at both ends of the motor, the present application provides a rotor shaft 100, Figure 1 A schematic diagram of the structure of a rotor shaft provided in an embodiment of the present application, Figure 2 A schematic diagram of the exploded structure of a rotating shaft body of a rotor shaft provided in an embodiment of the present application is shown in FIG. Figure 1 and Figure 2 As shown, it comprises a shaft body 10 and a guide core 20, wherein an oil inlet 11 is provided at one end of the shaft body 10, a cooling oil channel 12 extending in the axial direction is provided in the shaft body 10, a first oil outlet 13 is provided at one end of the hole wall of the shaft body 10 close to the oil inlet 11, and a second oil outlet 15 is provided at one end of the hole wall of the shaft body 10 away from the oil inlet 11; The guide core 20 is located in the cooling oil channel 12. The guide core 20 includes a core main section 21 and a guide section 22 extending from the core main section 21. The guide section 22 is arranged at one end close to the oil inlet 11. A first accommodating cavity 30 is formed between the guide section 22 and the oil inlet 11. The drainage section 22 is provided with a first flow channel 23 and a second flow channel 25 spaced apart along the circumferential direction. The first flow channel 23 extends from the drainage section 22 to the first oil outlet 13 ; the second flow channel 25 extends from the drainage section 22 to the second oil outlet 15 .

[0031] In the technical solution of this application, Figure 3 This is a schematic diagram of the cross-sectional structure of a rotating shaft body of a rotor shaft provided in an embodiment of the present application. Please refer to Figure 2 and Figure 3The cooling oil channel 12 inside the rotating shaft body 10 is equipped with a guide core 20, so that the cooling oil can flow to the first oil outlet 13 and the second oil outlet 15 along the first flow channel 23 and the second flow channel 25 provided on the surface of the guide section 22 at the front end of the guide core 20. In the process of the cooling oil flowing, the first flow channel 23 and the second flow channel 25 extending from the guide section 22 are arranged at intervals, thereby forming the prerequisite for limiting and distributing the cooling oil flowing in from the guide section 22 and the oil inlet 11 of the cooling oil channel 12. At the same time, the matching structural state of the drainage section 22 and the cooling oil channel 12 enables the drainage section 22 of the drainage core 20 and the cooling oil channel 12 to form a partially closed state, that is, the first flow channel 23 and the second flow channel 25 located in the drainage section 22 can be isolated from each other and form a closed cavity with the cooling oil channel 12, which also makes the cooling oil flowing out of the first oil outlet 13 and the second oil outlet 15 generate negative pressure in the process of flowing in the first flow channel 23 and the second flow channel 25. This negative pressure forms a suction force to continuously lead the cooling oil to flow out of the first oil outlet 13. , and the second oil outlet 15, and a first accommodating chamber 30 is formed between the drainage section 22 and the oil inlet 11, and the cooling oil entering the first accommodating chamber 30 can accumulate and accumulate, so that under the combined effect of the negative pressure and the cooling oil injection pressure, the cooling oil continuously flows, and finally the amount of cooling oil flowing out from the first oil outlet 13 and the second oil outlet 15 is consistent, ensuring the balanced rotation of the motor rotor, thereby solving the problems of rotation imbalance at both ends of the existing motor rotor and cooling imbalance at both ends of the motor, and can improve the cooling efficiency of the vehicle gearbox motor and reduce the motor failure rate.

[0032] The rotor shaft is the rotor part of the generator and motor in the vehicle gearbox, usually a shaft-shaped structure made of steel. When the vehicle is running, the power is output to the transmission assembly through the high-speed operation of the rotor. Therefore, the rotor is the basic part of the motor. If the motor is running, the operation is unbalanced or the temperature at both ends is inconsistent due to its internal cooling structure, which may cause the motor's operating center of gravity to shift, thereby affecting the cooling efficiency of the vehicle gearbox motor and increasing the motor's failure rate. Therefore, the setting and improvement of the cooling oil channel of the shaft body 10 is the premise for solving the current motor rotor problem.

[0033] In some embodiments, please refer to Figure 2 The shaft body 10 is provided with a cooling oil channel 12 extending in the axial direction, an oil inlet 11 communicating with the cooling oil channel 12 is provided at one end of the shaft body 10, a first oil outlet 13 is provided at one end of the hole wall of the shaft body 10 close to the oil inlet 11, and a second oil outlet 15 is provided at one end of the hole wall of the shaft body 10 away from the oil inlet 11. It can be understood that the cooling oil flows into the cooling oil channel 12 from the oil inlet 11 and flows out from the first oil outlet 13 and the second oil outlet 15, forming an oil circulation.

[0034] Specifically, a cooling oil hole 12 with a circular cross section is provided inside the rotating shaft body 10. The cooling oil hole 12 is a blind hole structure. The bottom end of the blind hole of the cooling oil hole 12 is a positioning end 122, and the positioning end 122 is opposite to the oil inlet 11. The cooling oil flows into the cooling oil hole 12 from the oil inlet 11. A first oil outlet 13 is provided on the inner wall of the cooling oil hole 12 near the front end of the cooling oil hole 12, that is, near the end of the oil inlet 11, and a second oil outlet 15 is provided on the inner wall of the cooling oil hole 12 near the positioning end 122.

[0035] In order to facilitate the outflow of cooling oil and the symmetry of the oil output at both ends of the cooling oil channel 12, the first oil outlet 13 and the second oil outlet 15 vertically penetrate the shaft body 10 and communicate with the cooling oil channel 12. Specifically, the first oil outlet 13 and the second oil outlet 15 are both circular hole structures. In other embodiments, the first oil outlet 13 and the second oil outlet 15 can also be elliptical holes or holes of other shapes, which are not limited here.

[0036] In order to make the oil discharge of the rotor shaft more balanced and further improve the problems of rotation imbalance at both ends of the motor rotor and cooling imbalance at both ends of the motor, the first oil outlet 13 and the second oil outlet 15 are staggered at intervals of vertical projection on the shaft body 10. For example, along the circumference of the shaft body 10, the first oil outlet 13 and the second oil outlet 15 are staggered, so that the oil is more balanced during the oil discharge process.

[0037] In some embodiments, at least two first oil outlets 13 are symmetrically arranged along the circumference of the shaft body 10 , and similarly, at least two second oil outlets 15 are also symmetrically arranged.

[0038] Specifically, at least two or more first oil outlets 13 and second oil outlets 15 are processed on the inner wall of the cooling oil hole 12 near the oil inlet 11 and the alignment end 122 of the cooling oil hole 12, and the number of the first oil outlets 13 and the second oil outlets 15 can be 2, 3, 4, 5 or more according to the diameter of the rotating shaft body 10, which is not limited here. At the same time, the first oil outlet 13 and the second oil outlet 15 can be connected to the cooling oil hole 12 vertically, obliquely or bent, which is not limited here; the cooling oil hole 12 can be a round hole structure, a square hole or other holes, which is not limited here.

[0039] In the above scheme, the cooling oil hole 12, the first oil outlet 13 and the second oil outlet 15 are all circular hole structures, which are convenient for processing and conducive to the discharge of cooling oil. At the same time, the first oil outlet 13 and the second oil outlet 15 arranged before and after the cooling oil hole 12 are staggered in the axial direction and staggered in the radial direction. This arrangement is beneficial to the rotation balance of the shaft body 10 not being affected, and is also beneficial to uniform cooling of the front and rear ends of the shaft body 10.

[0040] In the technical solution of the present application, the drainage core 20 arranged in the cooling oil channel 12 makes the original cooling oil channel 12 clearly structured and more functionally refined, thereby achieving the purpose of the present application of improving the cooling efficiency of the vehicle gearbox motor and reducing the motor failure rate.

[0041] Figure 4 A schematic diagram of the structure of a flow guide core of a rotor shaft provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the drainage core 20 is located in the cooling oil channel 12, and the drainage core 20 includes a core main section 21 and a drainage section 22 extending from the core main section 21. The drainage section 22 is interference fitted at one end of the cooling oil channel 12 close to the oil inlet 11, and the drainage section 22 is provided with a first flow channel 23 and a second flow channel 25 spaced apart along the circumferential direction.

[0042] In some embodiments, the drainage section 22 is a conical structure with a taper of 30° to 80°.

[0043] For details, please continue to see Figure 4 The appearance of the drainage core 20 is similar to the structure of a bullet. The straight body part is the main core section 21 of the drainage core 20, and the conical bullet head is divided into the drainage section 22 of the drainage core 20. The streamlined drainage core 20 is arranged in the cooling oil channel 12. Among them, the top of the drainage section 22 is a flattened end surface structure. The drainage section 22 is arranged near the oil inlet 11 of the cooling oil channel 12, and the tail end of the drainage core 20 abuts against the counter end 122 of the cooling oil channel 12.

[0044] In some embodiments, please refer to Figure 4 In order to ensure the stability of the connection between the drainage core 20 disposed in the cooling oil channel 12 and the inner wall of the cooling oil channel 12 and prevent the drainage core 20 from being displaced in the cooling oil channel 12, the core main section 21 includes a clearance section 211 and an interference fit section 212 which are sequentially connected to the drainage section 22. The interference fit section 212 is interference-installed at one end of the cooling oil channel 12 close to the second oil outlet 15, so that the rear end of the drainage core 20 is tightly connected to the cooling oil channel 12. At the same time, in order to strengthen the matching connection between the front end of the drainage core 20 and the cooling oil channel 12, the first accommodating cavity 30 is formed by the interference fit of part of the drainage section 22 and the cooling oil channel 12.

[0045] Specifically, the air avoidance section 211 is arranged in the middle part of the core main section 21, and the diameter of the middle part of the core main section 21 is smaller than the diameter of the interference fit section 212 at the tail end and the diversion section 22 at the front end, that is, the middle part of the core main section 21 is in a clearance fit state with the inner wall of the cooling oil channel 12; and the tail ends at both ends of the core main section 21 and the part of the diversion section 22 near the air avoidance section 211 are in an interference fit state with the inner wall of the cooling oil channel 12. Among them, the diversion section 22 is located at the oil inlet 11 of the cooling oil channel 12 and is recessed in the oil inlet 11, that is, the end face of the top of the diversion section 22 is lower than the end face of the oil inlet 11 of the cooling oil channel 12, and thus a first accommodating chamber 30 is formed between the diversion section 22 and the oil inlet 11 of the cooling oil channel 12, and a second accommodating chamber 50 is formed between the air avoidance section 211 and the inner wall of the cooling oil channel 12. The first accommodating chamber 30 and the second accommodating chamber 50 can accommodate cooling oil and store potential energy.

[0046] In order to increase the volume of the second accommodating chamber 50 , the length of the air avoidance section 211 is greater than the sum of the interference fit section 212 and the drainage section 22 , so as to accommodate more cooling oil.

[0047] In the technical solution of the present application, the taper of the drainage section 22 can be 30°, 40°, 50°, 60°, 70°, 80° or any value therebetween, without limitation here; the drainage core 20 can be a cylinder, a square column or other structure matching the cooling oil channel 12, without limitation here; the drainage section 22 can be a cone, a square cone, or a multi-faceted cone structure; the top of the drainage section 22 can be a plane, an arc, a square or a triangle; the drainage section 22 and the cooling oil channel 12 can be connected by interference fit, a clamping connection or other means; the air avoidance section 211 can be a cylindrical structure, a flat structure or a square structure, without limitation here.

[0048] In the above scheme, the interference fit section 212 of the drainage core 20 and the drainage section 22 are connected to the cooling oil channel 12 by interference fit. This connection method is simple and practical, which can not only ensure that the drainage core 20 will not be displaced, but also effectively isolate the first accommodating cavity 30 from the second accommodating cavity 50.

[0049] Figure 5 A schematic cross-sectional structure diagram of a flow guide core of a rotor shaft provided in an embodiment of the present application is shown in FIG. Figure 5 As shown, in order to ensure the uniformity of the structure of the shaft body 10 and the accuracy of cooling oil distribution, the diversion section 22 is provided with a first flow channel 23 and a second flow channel 25 arranged at intervals along the circumferential direction, the first flow channel 23 extends from the diversion section 22 to the first oil outlet 13, and the second flow channel 25 extends from the diversion section 22 to the second oil outlet 15.

[0050] In order to make the cooling oil flow smoothly and the outflow amount from the first oil outlet 13 and the second oil outlet 15 consistent, the first flow channel 23 and the second flow channel 25 are groove structures arranged on the surface of the guide core 20, and the cross-sectional dimensions of the first flow channel 23 and the second flow channel 25 are consistent. At the same time, in order to increase the oil output and take into account the dynamic balance of the shaft body 10, the first oil outlet 13 and the second oil outlet 15 are arranged at intervals in the axial direction of the shaft body 10, and intersect in the radial projection of the shaft body 10. The shaft body 10 is provided with at least two first oil outlets 13 and at least two second oil outlets 15; the guide section 22 is provided with at least two first flow channels 23 and the second flow channels 25. This design makes full use of the spatial structure of the shaft body 10 and the guide core 20. In order to further strengthen the balance of the flow at both ends of the cooling oil channel 12, the first flow channel 23 corresponds to the first oil outlet 13, and the second flow channel 25 corresponds to the second oil outlet 15.

[0051] For details, please continue to see Figure 5 , in the radial projection direction of the flow section 22, a second flow channel 25 is provided at 1 / 2 between every two first flow channels 23, that is, the first flow channels 23 and the second flow channels 25 are evenly spaced on the circumferential surface; and the first oil outlet 13 is penetrated on the hole wall of the cooling oil hole 12 in the form of a pair of holes, that is, the axes of the two first oil outlets are consistent with the radial direction of the cooling oil hole 12 and intersect at the axis of the cooling oil hole 12. At the same time, the first oil outlet 13 and the second oil outlet 15 are arranged corresponding to the first flow channel 23 and the second flow channel 25, that is, the number of the first flow channels 23 and the first oil outlet 13 is the same, and each first flow channel 23 corresponds to each first oil outlet 13; similarly, the number of the second flow channels 25 and the second oil outlet 15 is the same, and each second flow channel 25 corresponds to each second oil outlet 15.

[0052] In order to facilitate the processing of the drainage core 20 and reduce the process cost, the drainage core 20 is made of plastic. Among them, the core main section 21, the drainage section 22, the first flow channel 23 and the second flow channel 25 can all be processed by mechanical processing or injection molding.

[0053] In the present application, the drainage core 20 can be made of plastic or metal; the first flow channel 23 and the second flow channel 25 can be arranged on the surface of the drainage core 20 or inside the drainage core 20; the cross-section of the first flow channel 23 and the second flow channel 25 can be square, fan-shaped or semicircular; the number of the first flow channel 23 and the second flow channel 25 can be 2, 3, 4, 5 or more according to the diameter of the drainage core, and there is no limitation here.

[0054] In the above scheme, the first flow channel 23, the first accommodating chamber 30 and the first oil outlet 13 form an oil path combination at the front end of the rotating shaft body 10, so that the cooling oil entering the oil inlet 11 is gathered in the first accommodating chamber 30 under the action of the centrifugal force of the rotor and the cooling oil injection pressure, and then flows out from the first oil outlet 13 along the first flow channel 23, and the outflowing cooling oil generates negative pressure during the flow process. The cooling oil in the first accommodating chamber 30 is pulled by the negative pressure and combined with the centrifugal force and the injection pressure to quickly flow out from the first oil outlet 13. Similarly, the second flow channel 25, the second accommodating chamber 50, and the second oil outlet 15 form an oil circuit combination of the counter end 122 of the rotating shaft body 10. The cooling oil entering the second accommodating chamber 50 continuously flows out from the second oil outlet 15 under the combined action of the negative pressure traction, centrifugal force, and injection pressure. This structure is beneficial to the balance of oil output at the front and rear ends of the cooling oil channel 12, and makes the flow of the cooling oil entering the cooling oil channel 12 have a clear directionality. In addition, the structure of the drainage core 20 is simple and the processing cost is low, which is very conducive to promotion and application.

[0055] A rotor shaft 100 of the present application, Figure 6 A schematic diagram of the structure of a motor rotor of a rotor shaft provided in an embodiment of the present application, Figure 7 A schematic diagram of a cooling oil flow path of a rotating shaft body of a rotor shaft provided in an embodiment of the present application, such as Figure 6 and Figure 7 As shown, the cooling oil channel 12 is arranged inside the rotating shaft body 10 of the motor rotor shaft 100. During use, first use an alignment fixture to align the positions of the drainage core 20 and the cooling oil channel 12 to ensure that the first flow channel 23 is aligned with the first oil outlet 13 and the second flow channel 25 is aligned with the second oil outlet 15, and then use a pressure device to press the drainage core 20 into the cooling oil channel 12 so that the tail end of the drainage core 20 abuts against the alignment end 122 of the cooling oil channel 12.

[0056] The assembled rotating shaft body 10 is installed in the motor and then installed in the gearbox to communicate with the cooling system of the gearbox (not shown). After the cooling oil enters the cooling oil channel 12, it first enters the first accommodating chamber 30. After hitting the end surface of the drainage section 22, the cooling oil spreads in the circumferential direction, and the cooling oil directly contacts the inner wall of the cooling oil channel 12. When the motor rotor shaft 100 rotates, the cooling oil is thrown onto the inner wall of the cooling oil channel 12 under the action of centrifugal force after contacting the inner wall of the cooling oil channel 12. After the cooling oil flows along the first flow channel 23 to the first oil outlet 13, it will be immediately thrown out from the first oil outlet 13, and the thrown cooling oil forms a large negative pressure in the first flow channel 23. The generated negative pressure and the cooling oil injection pressure jointly pull the cooling oil to flow along the first flow channel 23. Then, when the motor speed is higher, the negative pressure generated by the centrifugal force plays a more dominant role, and the negative pressure pulls the cooling oil to be discharged continuously from the first oil outlet 13.

[0057] Similarly, the cooling oil flows along the second flow channel 25 to the second accommodation cavity 50 and accumulates there. The cooling oil is ejected from the second oil outlet 15. The ejected cooling oil forms a relatively large negative pressure in the second accommodation cavity 50 and the second flow channel 25. The generated negative pressure and the cooling oil injection pressure jointly draw the cooling oil to flow along the second flow channel 25. Furthermore, when the motor speed is higher, the negative pressure generated by the centrifugal force plays a more dominant role. The negative pressure draws the cooling oil to continuously discharge from the second oil outlet 15, forming a circulating flow of the cooling oil, and continuously taking away the heat generated by the motor rotor and stator.

[0058] In summary, the present application provides a rotor shaft 100. The hole walls at the front and rear ends of the cooling oil passage 12 inside the structure of the rotor shaft 100 are provided with a plurality of first oil outlets 13 and second oil outlets 15. And a drainage core 20 is installed in the cooling oil passage 12. The surface of the drainage core 20 is provided with a first flow channel 23 and a second flow channel 25 with different lengths corresponding to the first oil outlet 13 and the second oil outlet 15. Under the traction of the negative pressure, the amount of oil discharged from the first oil outlet 13 and the second oil outlet 15 is the same. Therefore, the present application solves the problems of rotational imbalance and uneven cooling at both ends of the motor caused by inconsistent cooling oil outflow at both ends of the cooling oil passage 12 of the motor rotor of the existing new energy vehicle. The rotor shaft 100 of the present application will not be eccentric during operation, nor will it cause temperature deviation at both ends of the motor. Therefore, it can improve the cooling efficiency of the vehicle transmission motor and reduce the motor failure rate.

[0059] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A rotor shaft, characterized in that: It comprises a shaft body and a guide core, wherein one end of the shaft body is provided with an oil inlet, the shaft body is provided with a cooling oil channel extending in the axial direction, an end of the hole wall of the shaft body close to the oil inlet is provided with a first oil outlet, and an end of the hole wall of the shaft body away from the oil inlet is provided with a second oil outlet; The guide core is located in the cooling oil channel, and the guide core includes a core main section and a guide section extending from the core main section. The guide section is arranged at one end close to the oil inlet, and a first accommodating cavity is formed between the guide section and the oil inlet; The drainage section is provided with a first flow channel and a second flow channel spaced apart along the circumferential direction, wherein the first flow channel extends from the drainage section to the first oil outlet; and the second flow channel extends from the drainage section to the second oil outlet.

2. A rotor shaft according to claim 1, characterized in that: The first accommodating cavity is formed by interference fit between a portion of the drainage section and the cooling oil channel.

3. A rotor shaft according to claim 1, characterized in that: The core main section comprises a clearance section and an interference fit section which are sequentially connected to the drainage section, and the interference fit section is interference-mounted at one end of the cooling oil channel close to the second oil outlet.

4. A rotor shaft according to claim 3, characterized in that: The air avoidance section is arranged in the middle part of the core main section; the length of the air avoidance section is greater than the sum of the interference fit section and the drainage section.

5. The rotor shaft according to claim 1, characterized in that: The first flow channel and the second flow channel are groove structures arranged on the surface of the guide core; the cross-sectional dimensions of the first flow channel and the second flow channel are consistent.

6. A rotor shaft according to claim 1, characterized in that: The drainage section is a conical structure with a taper of 30° to 80°.

7. A rotor shaft according to claim 1, characterized in that: The first oil outlet and the second oil outlet vertically penetrate the rotating shaft body and are connected to the cooling oil channel.

8. The rotor shaft according to claim 1, characterized in that: The first oil outlet and the second oil outlet are arranged at intervals in the axial direction of the rotating shaft body, and are arranged to intersect in the radial projection of the rotating shaft body; The shaft body is provided with at least two first oil outlets and at least two second oil outlets; the diversion section is provided with at least two first flow channels and the second flow channels; the first flow channel corresponds to the first oil outlet; the second flow channel corresponds to the second oil outlet.

9. A motor, characterized in that: Comprising a rotor shaft as claimed in any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the motor as claimed in claim 9.

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