Rotor shaft and motor

Abstract

The invention relates to a rotor shaft and a motor, and the rotor shaft comprises a shaft body which is provided with a shaft liquid outlet hole; the liquid supply pipeline is connected with the shaft body and is provided with a fitting position, a first cavity is formed adjacent to the fitting position, the first cavity is communicated with the shaft liquid outlet hole, a circulation channel is formed in the liquid supply pipeline, a pipe liquid outlet hole and a liquid inlet are formed in the liquid supply pipeline, and the circulation channel is communicated with the first cavity through the pipe liquid outlet hole; and the throttling mechanism is arranged in the circulation channel and connected with the liquid supply pipeline, the throttling mechanism is located between the pipe liquid outlet hole and the liquid inlet, the throttling mechanism is provided with a throttling opening, and the circulation area of the throttling opening is adjustable. The flow area of the throttling opening can be adjusted according to the rotating speed of the motor, the situation that the cooling performance of a motor rotor is excessive due to the fact that the amount of oil entering a motor rotor shaft is sharply increased at the high rotating speed of the motor is avoided, meanwhile, the amount of oil entering a motor stator and other oil ways of an electric drive system is guaranteed, and the service life of the motor is prolonged. And the cooling performance of the motor stator and other oil ways of the electric drive system is ensured.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, the demand for high-speed, high-power motors is increasing. High-speed, high-power motors generate significant heat, creating serious cooling challenges. Failure to promptly and effectively cool the motors and reduce their temperature can lead to demagnetization of the permanent magnets and insulation failure of the windings, resulting in reduced motor performance or even failure, and serious quality issues.

[0003] In the prior art, the motor and other components of the electric drive system (such as the reducer) share a common oil circuit system, and the motor has two internal cooling oil circuits: the motor stator cooling circuit and the motor rotor cooling circuit. When the motor speed is high, the high speed significantly increases the negative pressure of the oil inside the motor rotor shaft, causing the amount of oil entering the motor rotor shaft to increase sharply, far exceeding the required oil volume. This leads to a serious shortage of oil entering the motor stator and other oil circuits of the electric drive system, resulting in excessive cooling performance of the motor rotor and insufficient cooling performance of the motor stator and other components of the electric drive system. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a rotor shaft to solve the problem in the prior art that when the motor speed is high, the amount of oil entering the motor rotor shaft increases sharply, resulting in excessive cooling performance of the motor rotor and insufficient cooling performance of the motor stator; the second purpose is to provide a motor.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A rotor shaft comprises: a shaft body, wherein a central cavity is formed inside, and the shaft body is provided with a shaft liquid outlet; a liquid supply pipeline, at least partially located in the central cavity and connected to the shaft body, the outer wall of the liquid supply pipeline and the inner wall of the shaft body having a fitting position, the outer wall of the liquid supply pipeline and the inner wall of the shaft body adjacent to the fitting position are spaced apart to form a first cavity, the first cavity is communicated with the shaft liquid outlet, a circulation channel is formed in the liquid supply pipeline, the liquid supply pipeline is provided with a tube liquid outlet and a liquid inlet spaced apart along the axial direction, and the circulation channel is communicated with the first cavity through the tube liquid outlet; a throttling mechanism is arranged in the circulation channel and connected to the liquid supply pipeline, the throttling mechanism is located between the tube liquid outlet and the liquid inlet, the throttling mechanism has a throttling port, and the flow area of the throttling port is adjustable.

[0007] According to the above technical means, a throttling mechanism is provided, and a throttling port capable of adjusting the flow area is formed in the throttling mechanism, so that the flow area of the throttling port can be adjusted according to the rotational speed of the motor, thereby avoiding a sharp increase in the amount of oil entering the motor rotor shaft at high motor speeds, which would result in excessive cooling performance of the motor rotor. At the same time, the amount of oil entering the motor stator and other oil circuits of the electric drive system is guaranteed, thereby ensuring the cooling performance of the motor stator and other oil circuits of the electric drive system.

[0008] Furthermore, the throttling mechanism includes a mounting seat and a slider, the outer periphery of the mounting seat is fitted with the inner wall of the liquid supply pipeline, the mounting seat is provided with a notch arranged along the axial direction, the slider and the mounting seat are slidably connected to adjust the covering area of the notch by the slider, and the mounting seat, the slider and the liquid supply pipeline jointly define the throttling port.

[0009] According to the above technical means, by adjusting the sliding position of the slider, the flow area of the throttle port is adjusted, thereby adjusting the amount of oil entering the rotor shaft. The adjustment structure and adjustment method are relatively simple and easy to operate.

[0010] Furthermore, the mounting seat is provided with at least two notches that are relatively spaced apart, and at least two sliders are provided, and at least two sliders are provided in a one-to-one correspondence with at least two notches; the throttling mechanism also includes an elastic member, and the two ends of the elastic member are respectively connected to the two sliders that are relatively arranged.

[0011] According to the above technical means, when the rotor shaft rotates, the slider slides under the combined action of centrifugal force and the elastic force of the elastic member. That is, during the rotation of the rotor shaft, the position of the slider is automatically adjusted by utilizing the action of centrifugal force and the elastic force of the elastic member, so that the flow area of the throttle port is adapted to the rotational speed of the rotor shaft, thereby ensuring the cooling effect of the rotor while avoiding excessive cooling performance.

[0012] Furthermore, the slider includes a main body and a guide boss, the main body is used to cover the gap, and the guide boss is connected to the main body and is slidably connected to the mounting seat.

[0013] According to the above technical means, the guide boss is slidably connected to the mounting seat to improve the stability and position accuracy of the slider during sliding.

[0014] Furthermore, the guide boss is protruding from the main body at one end close to the liquid supply pipeline; and / or the main body includes a baffle and a connecting portion, two baffles are arranged at intervals along the axial direction, the connecting portion connects the two baffles, and the mounting seat is clamped between the two baffles.

[0015] According to the above technical means, the extreme position of the slider can be limited by using the guide boss close to one end of the liquid supply pipeline. When the rotor shaft reaches a certain speed, the flow area of the throttle port is at the minimum flow area and remains unchanged, thereby ensuring that sufficient oil can still enter the rotor shaft at a high speed of the rotor shaft to ensure the cooling effect of the rotor; and / or, two baffles are used to clamp the mounting seat to form a sealing structure, thereby blocking the oil from passing through other positions of the notch except the throttle port, ensuring the blocking effect of the throttle mechanism on the oil, and improving the control accuracy of the throttle mechanism on the amount of oil passing through.

[0016] Furthermore, the liquid supply pipeline includes: a first tube body, which is arranged in the central cavity, and the two ends of the first tube body are arranged to fit the inner wall of the shaft body to form two fitting positions, the first end of the first tube body is closed, and the second end of the first tube body is set to be through to form a connecting port, and the liquid outlet is opened in the first tube body; a second tube body, the first end of the second tube body is connected to the first tube body and communicated with the connecting port, and the second end of the second tube body forms the liquid inlet.

[0017] According to the above technical means, the liquid supply pipeline is provided as the first tube body and the second tube body, which is convenient for assembly with the throttling mechanism and for maintenance of the rotor shaft and replacement of various components.

[0018] Furthermore, the first end of the second tube is sleeved on the second end of the first tube and connected.

[0019] According to the above technical means, the connection stability and sealing effect of the first tube body and the second tube body are guaranteed.

[0020] Furthermore, a first limiting surface facing the second tube body is formed in the first tube body, a second limiting surface facing the first tube body is formed in the second tube body, and the throttling mechanism is sandwiched between the first limiting surface and the second limiting surface.

[0021] According to the above technical means, the first limiting surface and the second limiting surface are used to limit the throttling mechanism on two opposite sides along the axial direction, which facilitates the positioning and installation of the throttling mechanism.

[0022] Furthermore, two shaft liquid outlet holes are spaced apart on an axis of the surface of the shaft body, and the two shaft liquid outlet holes are at the same distance from the tube liquid outlet hole along the axial direction.

[0023] According to the above technical means, the oil entering the liquid supply pipeline passes through the same path and structure, and then flows out from the two shaft outlet holes, forming an equal flow resistance structure, ensuring the uniformity of cooling along the axial direction of the rotor and avoiding local overheating of the rotor and causing failure.

[0024] A motor comprises the above-mentioned rotor shaft.

[0025] According to the above technical means, while ensuring the cooling performance of the motor rotor, excessive cooling performance of the motor rotor is avoided, and at the same time, the cooling performance of the motor stator and other oil circuits of the electric drive system is guaranteed.

[0026] Beneficial effects of the present invention:

[0027] (1) The present invention provides a throttling mechanism and forms a throttling port capable of adjusting the flow area in the throttling mechanism, thereby being able to adjust the flow area of the throttling port according to the rotational speed of the motor, thereby avoiding a sharp increase in the amount of oil entering the motor rotor shaft at high motor speeds, which would result in excessive cooling performance of the motor rotor. At the same time, the amount of oil entering the motor stator and other oil circuits of the electric drive system is ensured, thereby ensuring the cooling performance of the motor stator and other oil circuits of the electric drive system.

[0028] (2) The present invention adjusts the flow area of the throttle port by adjusting the sliding position of the slider, thereby adjusting the amount of oil entering the rotor shaft. The adjustment structure and adjustment method are relatively simple and easy to operate;

[0029] (3) When the rotor shaft rotates, the slider slides under the combined action of centrifugal force and the elastic force of the elastic member. That is, during the rotation of the rotor shaft, the position of the slider is automatically adjusted by the action of centrifugal force and the elastic force of the elastic member, so that the flow area of the throttle port is adapted to the rotation speed of the rotor shaft, thereby ensuring the cooling effect of the rotor while avoiding excessive cooling performance.

[0030] (4) The present invention utilizes a guide boss to be slidably connected to the mounting seat to improve the stability and position accuracy of the slider during sliding. In addition, the guide boss is close to the end of the liquid supply pipeline to limit the extreme position of the slider. When the rotor shaft reaches a certain speed, the flow area of the throttle port is at the minimum flow area and remains unchanged, thereby ensuring that sufficient oil can still enter the rotor shaft at a high speed of the rotor shaft, thereby ensuring the cooling effect of the rotor.

[0031] (5) The present invention utilizes two baffles to clamp the mounting seat to cooperate and form a sealing structure, thereby preventing the oil from passing through other positions of the notch except the throttle opening, thereby ensuring the blocking effect of the throttle mechanism on the oil and improving the control accuracy of the throttle mechanism on the amount of oil passing through;

[0032] (6) The present invention provides the liquid supply pipeline with a first tube body and a second tube body, which facilitates assembly with the throttling mechanism and facilitates maintenance of the rotor shaft and replacement of various components;

[0033] (7) The connection method of the first tube body and the second tube body of the present invention can ensure the connection stability and sealing effect of the first tube body and the second tube body;

[0034] (8) The present invention utilizes the first limiting surface and the second limiting surface to limit the throttling mechanism on two opposite sides along the axial direction, thereby facilitating the positioning and installation of the throttling mechanism;

[0035] (9) The present invention allows the oil entering the liquid supply pipeline to pass through the same path and structure and then flow out from the two shaft outlet holes, forming an equal flow resistance structure, ensuring the cooling uniformity of the rotor shaft along the axial direction and avoiding local overheating of the rotor shaft and causing failure;

[0036] (10) The present invention ensures the cooling performance of the motor rotor while avoiding excessive cooling performance of the motor rotor, and at the same time ensures the cooling performance of the motor stator and other oil circuits of the electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Schematic diagram of the overall structure of the rotor shaft of the present invention;

[0038] Figure 2 A top view of the rotor shaft of the present invention when the throttling mechanism is at a maximum flow area;

[0039] Figure 3 for Figure 2 Cross-sectional view in the AA direction;

[0040] Figure 4 for Figure 3 Cross-sectional view in the middle BB direction;

[0041] Figure 5 for Figure 2 A front view of the rotor shaft is shown;

[0042] Figure 6 It is a structural schematic diagram of the throttling mechanism of the present invention when it is at the maximum flow area;

[0043] Figure 7 for Figure 6 A front view of the throttle mechanism shown;

[0044] Figure 8 for Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0045] Figure 9 A top view of the rotor shaft of the present invention when the throttling mechanism is at a minimum flow area;

[0046] Figure 10 for Figure 9 Cross-sectional view in the middle DD direction;

[0047] Figure 11 for Figure 10 Cross-sectional view in the EE direction;

[0048] Figure 12 for Figure 9 A front view of the rotor shaft is shown;

[0049] Figure 13 It is a structural schematic diagram of the throttling mechanism of the present invention when it is at the minimum flow area;

[0050] Figure 14 for Figure 13 A front view of the throttle mechanism shown;

[0051] Figure 15 It is a structural schematic diagram of the mounting base of the present invention;

[0052] Figure 16 A schematic structural diagram of a slider according to the present invention at one angle;

[0053] Figure 17 It is a structural schematic diagram of another angle of the slider of the present invention.

[0054] Among them, 1-shaft body; 11-shaft liquid outlet; 2-liquid supply pipeline; 21-tube liquid outlet; 22-liquid inlet; 23-first tube body; 231-first limiting surface; 24-second tube body; 241-second limiting surface; 3-fitting position; 4-first cavity; 5-circulation channel; 51-first channel; 52-second channel; 6-throttling mechanism; 61-throttling port; 62-mounting seat; 621-notch; 622-first blocking part; 623-second blocking part; 624-third blocking part; 6241-mounting hole; 625-slide groove; 63-slider; 631-main body; 6311-baffle; 6312-connecting part; 63121-fixing hole; 63122-limiting part; 632-guide boss; 64-elastic part; 7-sealing ring; 8-clamping ring. DETAILED DESCRIPTION

[0055] The following describes the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art will readily appreciate the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the various details in this specification may be modified or altered based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are intended only to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0056] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0057] This embodiment proposes a rotor shaft, such as Figures 1 to 17 As shown, it includes: a shaft body 1, which has a central cavity formed therein, and the shaft body 1 is provided with a shaft liquid outlet 11; a liquid supply pipeline 2, which is at least partially located in the central cavity and connected to the shaft body 1, and the outer wall of the liquid supply pipeline 2 and the inner wall of the shaft body 1 have a fitting position 3, and the outer wall of the liquid supply pipeline 2 and the inner wall of the shaft body 1 adjacent to the fitting position 3 are spaced apart to form a first cavity 4, and the first cavity 4 is connected to the shaft liquid outlet 11, and a circulation channel 5 is formed in the liquid supply pipeline 2, and the liquid supply pipeline 2 is provided with a tube liquid outlet 21 and a liquid inlet 22 spaced apart along the axial direction, and the circulation channel 5 is connected to the first cavity 4 through the tube liquid outlet 21; a throttling mechanism 6 is arranged in the circulation channel 5 and connected to the liquid supply pipeline 2, and the throttling mechanism 6 is located between the tube liquid outlet 21 and the liquid inlet 22, and the throttling mechanism 6 has a throttling port 61, and the flow area of the throttling port 61 is adjustable.

[0058] The rotor shaft of this embodiment is applied, by providing a throttling mechanism 6, and forming a throttling port 61 capable of adjusting the flow area in the throttling mechanism 6, so that the flow area of the throttling port 61 can be adjusted according to the rotational speed of the motor, thereby avoiding a sharp increase in the amount of oil entering the motor rotor shaft at high motor speeds, which would lead to excessive cooling performance of the motor rotor. At the same time, the amount of oil entering the motor stator and other oil circuits of the electric drive system is guaranteed, thereby ensuring the cooling performance of the motor stator and other oil circuits of the electric drive system.

[0059] It's worth noting that in the relevant technologies for motor cooling, in the motor stator cooling oil circuit, oil flows from the motor housing to the back of the stator to cool the stator, then flows out from the stator end to the winding, cooling the outer winding ring. In the motor rotor cooling oil circuit, oil flows from the motor housing through the end of the motor rotor shaft into the rotor shaft. Under the action of oil pressure and centrifugal force, oil flows out of the front and rear oil outlet holes of the motor rotor shaft into the rotor interior, cooling the rotor and magnets. It then flows out from both ends of the rotor and is thrown onto the front and rear winding inner rings, cooling these two inner rings. This achieves cooling of the entire motor. However, when the motor is running at high speed, the high rotor shaft speed increases the negative pressure inside the rotor shaft, resulting in excessive oil entering the rotor shaft, resulting in excessive cooling of the motor rotor and insufficient cooling of the motor stator or other components of the electric drive system.

[0060] Specifically, in this embodiment, Figure 3 and Figure 10 As shown, the outer wall of the liquid supply pipeline 2 and the inner wall of the shaft body 1 have two fitting positions 3 spaced apart along the axial direction. Between the two fitting positions 3, the outer wall of the liquid supply pipeline 2 and the inner wall of the shaft body 1 are spaced apart to form a first cavity 4.

[0061] It should be noted that, in this embodiment, Figure 3 and Figure 10As shown, the liquid supply pipeline 2 forms a liquid inlet 22 at one end of the throttling mechanism 6 away from the liquid outlet hole 21 .

[0062] In this embodiment, if Figure 3 and Figure 10 As shown, the throttle mechanism 6 divides the flow channel 5 into a first channel 51 and a second channel 52. The liquid inlet 22 is connected to the second channel 52, which is then connected to the first channel 51 via the throttle opening 61. The first channel 51 is connected to the first cavity 4 via the pipe outlet 21, and the first cavity 4 is connected to the shaft outlet 11. Specifically, oil enters the second channel 52 through the liquid inlet 22, then enters the first channel 51 through the throttle opening 61, then enters the first cavity 4 through the pipe outlet 21, and finally flows out through the shaft outlet.

[0063] Therefore, in this embodiment, when the rotor shaft is at a lower speed, the negative pressure inside the rotor shaft is lower, and the amount of oil entering the second channel 52 is lower. At this time, the throttle port 61 has a larger flow area to ensure the amount of oil flowing from the throttle port 61 into the first channel 51 and into the first cavity 4; when the rotor shaft is at a higher speed, the negative pressure inside the rotor shaft is higher, and the amount of oil entering the second channel 52 increases. At this time, the throttle port 61 has a smaller flow area, thereby improving the blocking effect of the throttle mechanism 6 on the oil, and avoiding excessive oil flowing from the throttle port 61 into the first channel 51 and into the first cavity 4.

[0064] In this embodiment, if Figure 6 、 Figure 7 、 Figures 13 to 17 As shown, the throttling mechanism 6 includes a mounting seat 62 and a slider 63. The outer periphery of the mounting seat 62 is positioned in contact with the inner wall of the liquid supply pipeline 2. The mounting seat 62 defines an axially extending notch 621. The slider 63 is slidably connected to the mounting seat 62 to adjust the area covered by the slider 63 over the notch 621. The mounting seat 62, the slider 63, and the liquid supply pipeline 2 collectively define a throttle opening 61. This arrangement allows the flow area of the throttle opening 61 to be adjusted by adjusting the sliding position of the slider 63, thereby adjusting the amount of oil entering the rotor shaft. The adjustment structure and method are both relatively simple and easy to operate.

[0065] It should be noted that the slider 63 can cover the notch 621. In this case, the portion of the notch 621 not covered by the slider 63 serves as the throttle 61. It is understood that when the slider 63 does not cover the notch 621, the entire notch 621 serves as the throttle 61; when the slider 63 covers the entire notch 621, the flow area of the throttle 61 is zero.

[0066] It is worth noting that, please refer to Figures 2 to 7When the rotor shaft is at a lower speed, the slider 63 covers a smaller range of the gap 621, thereby making the flow area of the throttle 61 larger; please refer to Figures 9 to 14 When the rotor shaft is at a higher speed, the slider 63 covers a larger range of the gap 621, thereby reducing the flow area of the throttle port 61.

[0067] In this embodiment, if Figure 6 、 Figure 13 and Figure 15 As shown, the mounting seat 62 is provided with two gaps 621 spaced apart from each other, and two sliders 63 are provided, and the two sliders 63 are respectively provided corresponding to the two gaps 621; Figure 4 and Figure 11 As shown, the throttling mechanism 6 further includes an elastic member 64, the two ends of which are respectively connected to the two sliders 63. With this arrangement, when the rotor shaft rotates, the sliders 63 slide under the combined action of centrifugal force and the elastic force of the elastic member 64. That is, during the rotation of the rotor shaft, the position of the sliders 63 is automatically adjusted by the centrifugal force and the elastic force of the elastic member 64, so that the flow area of the throttling port 61 is adapted to the rotational speed of the rotor shaft, thereby ensuring the cooling effect of the rotor while avoiding excessive cooling performance.

[0068] It is worth noting that as the speed increases, the negative pressure within the rotor shaft increases, and the amount of oil entering the second channel 52 tends to increase. Furthermore, as the speed increases, the centrifugal force also gradually increases, causing the two sliders 63 to slide on the mounting seat 62 away from the axis (i.e., toward the inner wall of the liquid supply pipe), reducing the flow area of the throttle opening 61 and increasing the flow resistance of the oil. Therefore, due to the combined effect of increasing the amount of oil entering the second channel 52 and the enhanced oil blocking effect of the throttle mechanism 6, the amount of oil entering the first channel 51 can be controlled to increase slowly as needed, thereby ensuring the rotor cooling effect while avoiding excessive rotor cooling performance.

[0069] It should be noted that when the rotor shaft speed decreases, the negative pressure within the rotor shaft decreases, reducing the amount of oil entering the second channel 52. Furthermore, as the rotor shaft speed decreases, the centrifugal force also gradually decreases. Under the action of the spring force, the two sliders 63 slide on the mounting seat 62 toward the axis (i.e., away from the inner wall of the liquid supply pipe), increasing the flow area of the throttle 61 and ensuring the amount of oil entering the first channel 51. It is understandable that due to the low rotor shaft speed, less oil enters the second channel 52. Even if the flow area of the throttle 61 is increased, the amount of oil entering the first channel 51 will be reduced as needed.

[0070] Of course, as an alternative embodiment, the mounting base 62 may be provided with more (more than two) notches 621, such as four, six, or eight, wherein every two notches 621 are spaced apart from each other. In this case, a plurality of sliders 63 are also provided, and the plurality of sliders 63 are provided in a one-to-one correspondence with the plurality of notches 621. Accordingly, the two opposing sliders 63 are connected by an elastic member 64. Optionally, the plurality of notches 621 are arranged in a circular array on the mounting base 62.

[0071] Specifically, in this embodiment, Figure 15 As shown, the mounting base 62 includes a first blocking portion 622, a second blocking portion 623, and a third blocking portion 624. The first blocking portion 622 and the second blocking portion 623 are spaced apart from each other, and the third blocking portion 624 is connected between the first blocking portion 622 and the second blocking portion 623. The third blocking portion 624 separates the space between the first blocking portion 622 and the second blocking portion 623 to form two gaps 621. The outer wall surfaces of the first blocking portion 622 and the second blocking portion 623 away from the third blocking portion 624 are both arc-shaped to fit the inner wall of the liquid supply pipe and improve the sealing effect.

[0072] Furthermore, in this embodiment, Figure 15 As shown, the third blocking portion 624 is provided with a mounting hole 6241, and the elastic member 64 is arranged to pass through the mounting hole 6241 so that the two ends of the elastic member 64 are respectively connected to the two sliders 63. In addition, the mounting hole 6241 can guide and limit the elastic member 64.

[0073] In this embodiment, if Figure 16 and Figure 17 As shown, the slider 63 includes a main body 631 and a guide boss 632. The main body 631 is used to cover the notch 621. The guide boss 632 is connected to the main body 631 and is slidably connected to the mounting seat 62. The end of the guide boss 632 near the liquid supply pipeline 2 protrudes from the main body 631. This arrangement, utilizing the slidable connection between the guide boss 632 and the mounting seat 62, improves the stability and position accuracy of the slider 63 during sliding. Furthermore, the end of the guide boss 632 near the liquid supply pipeline 2 can limit the extreme position of the slider 63. When the rotor shaft reaches a certain speed, the flow area of the throttle port 61 is maintained at the minimum flow area, thereby ensuring that sufficient oil can enter the rotor shaft even at high rotor speeds, ensuring the cooling effect of the rotor.

[0074] Specifically, in this embodiment, Figure 15 As shown, the first blocking portion 622 and the second blocking portion 623 are both provided with a sliding groove 625 on one side facing the notch 621 , and the guide boss 632 is slidably disposed in the sliding groove 625 , and a corresponding guide boss 632 is disposed in each sliding groove 625 .

[0075] It is worth noting that since the end of the guide boss 632 close to the liquid supply pipeline 2 protrudes from the main body 631, when the rotational speed of the rotor shaft increases to a certain value, the end of the guide boss 632 close to the liquid supply pipeline 2 can abut against the inner wall of the liquid supply pipeline 2, and the side of the main body 631 close to the liquid supply pipeline 2 does not abut against the inner wall of the liquid supply pipeline 2. Therefore, even if the rotor shaft is in a high-speed state, the notch 621 is not completely covered, and a throttle port 61 with a certain flow area is left to ensure the cooling effect of the rotor.

[0076] In this embodiment, if Figure 16 and Figure 17 As shown, the main body 631 includes a baffle 6311 and a connecting portion 6312. Two baffles 6311 are provided at intervals along the axial direction. The connecting portion 6312 connects the two baffles 6311, and the mounting seat 62 is clamped between the two baffles 6311. The two baffles 6311 clamp the mounting seat 62 to form a sealing structure, thereby preventing oil from passing through other positions of the notch 621 except the throttle port 61, ensuring the throttle mechanism 6's blocking effect on oil and improving the throttle mechanism 6's control accuracy over the amount of oil passing through.

[0077] It is worth noting that if Figure 16 and Figure 17 As shown, the connecting portion 6312 defines two fixing holes 63121, which are spaced apart so that the portion of the connecting portion 6312 between the two fixing holes 63121 forms a stopper 63122. The elastic member 64 is a spring having a hook at its end, which passes through the fixing holes 63121 and hooks onto the stopper 63122.

[0078] It should be noted that the throttle mechanism 6 of this embodiment has a simple structure, is easy to install, and has only two moving parts (sliders 63), resulting in high structural reliability. Furthermore, the throttle mechanism 6 can be independently installed in hollow shafts of various sizes and types, providing high applicability and reducing the weight of the motor rotor shaft and the number of processing steps.

[0079] In this embodiment, if Figure 3 and Figure 10As shown, the liquid supply pipeline 2 includes: a first tube body 23, disposed within the central cavity. The two ends of the first tube body 23 are aligned with the inner wall of the shaft body 1 to form two alignment locations 3. The first end of the first tube body 23 is sealed, while the second end of the first tube body 23 is through-connected to form a communication port. A liquid outlet 21 is provided in the first tube body 23. A second tube body 24, the first end of which is connected to the first tube body 23 and communicates with the communication port. The second end of the second tube body 24 forms a liquid inlet 22. The arrangement of the liquid supply pipeline 2 as a first tube body 23 and a second tube body 24 facilitates assembly with the throttling mechanism 6, as well as maintenance of the rotor shaft and replacement of various components.

[0080] It is worth noting that, please refer to Figure 3 The first end of the first tube 23 is Figure 3 The upper end of the first tube body 23 is correspondingly Figure 3 The lower end of the first tube 23; the first end of the second tube 24 is Figure 3 The upper end of the second tube body 24 is correspondingly Figure 3 The lower end of the second tube body 24.

[0081] Specifically, in this embodiment, Figure 3 and Figure 10 As shown, a sealing ring 7 is provided at the fitting position 3 between one end of the first tube 23 and the inner wall of the shaft body 1 to achieve a seal between the first tube 23 and the shaft body 1. Furthermore, a small process gap is formed between the fitting position 3 between the other end of the first tube 23 and the inner wall of the shaft body 1 to facilitate the discharge of oil during motor maintenance.

[0082] In this embodiment, if Figure 3 and Figure 10 As shown, the first end of the second tube body 24 is sleeved on the second end of the first tube body 23 and connected. This arrangement ensures the connection stability and sealing effect of the first tube body 23 and the second tube body 24.

[0083] Specifically, in this embodiment, the first tube body 23 and the second tube body 24 are fixed by bonding. Figure 3 and Figure 10 As shown, a clamping ring 8 is provided on the outer sides of the opposite ends of the first tube body 23 along the axial direction, and a groove is opened in the shaft body 1 at the position corresponding to the clamping ring 8. The clamping ring 8 is set in the groove and abuts against the end of the first tube body 23.

[0084] In this embodiment, if Figure 8As shown, a first limiting surface 231 facing the second tube body 24 is formed in the first tube body 23, and a second limiting surface 241 facing the first tube body 23 is formed in the second tube body 24. The throttle mechanism 6 is sandwiched between the first limiting surface 231 and the second limiting surface 241. The first limiting surface 231 and the second limiting surface 241 are used to limit the throttle mechanism 6 on opposite sides along the axial direction, thereby facilitating the positioning and installation of the throttle mechanism 6.

[0085] It is worth noting that the inner diameter of the first tube body 23 is increased near the second end to form an axial shoulder, and the axial shoulder of the first tube body 23 is facing the side of the second tube body 24 to form a first limiting surface 231; the inner diameter of the second tube body 24 is increased near the first end to form an axial shoulder, and the axial shoulder of the second tube body 24 is facing the side of the first tube body 23 to form a second limiting surface 241.

[0086] When assembling the first tube body 23, the second tube body 24, and the throttle mechanism 6, first, the throttle mechanism 6 is installed in the first tube body 23, with one surface of the mounting seat 62 aligned with the first limiting surface 231. Then, the first end of the second tube body 24 is sleeved around the outer circumference of the second end of the first tube body 23, and the second tube body 24 and the first tube body 23 are bonded and fixed, with the second limiting surface 241 aligned with the other surface of the mounting seat 62. The two opposing surfaces of the mounting seat 62 along the axial direction form end face seals with the first limiting surface 231 and the second limiting surface 241, respectively.

[0087] In this embodiment, if Figure 3 and Figure 10 As shown, two shaft outlet holes 11 are spaced apart along an axis on the surface of shaft body 1. These two shaft outlet holes 11 are axially spaced equidistant from tube outlet hole 21. This arrangement ensures that oil entering liquid supply line 2 flows through the same path and structure before exiting through both shaft outlet holes 11, creating an equal flow resistance structure. This ensures uniform cooling of the rotor along the axial direction and prevents localized rotor overheating and failure.

[0088] Further, such as Figure 1 As shown, a plurality of shaft liquid outlet holes 11 are evenly spaced along the circumference of the shaft body 1 .

[0089] It is worth noting that in the relevant technologies related to motor cooling, under the action of high centrifugal force and high negative pressure, most of the oil entering the rotor shaft will flow out from the shaft outlet hole 11 near the liquid inlet 22, while the amount of oil flowing out of the shaft outlet hole 11 away from the liquid inlet 22 is greatly reduced or even eliminated, thereby causing uneven cooling of the front and rear end windings of the motor and excessive temperature differences, resulting in poor motor cooling performance and even local overheating leading to failure. Although in the relevant technologies, the problem of inconsistent oil output from the front and rear oil outlet holes of the motor rotor shaft can be solved to a certain extent by changing the number of front and rear oil outlet holes of the motor rotor shaft or changing the position of the oil inlet of the motor rotor shaft, these two methods are complex in processing and assembly, and the reliability of the components is low. These problems have become key factors that restrict the further improvement of the speed and power of the motor.

[0090] In this embodiment, an equal flow resistance structure is formed by the installation and cooperation of the liquid supply pipeline 2 and the shaft body 1, which can ensure that the oil output of the shaft liquid outlet 11 close to the liquid inlet 22 and the shaft liquid outlet away from the liquid inlet 22 are consistent. The processing and assembly methods are simple and reliable, and the cooling uniformity of the front and rear end windings of the motor is guaranteed, local overheating is avoided, and the overall cooling performance of the motor is guaranteed.

[0091] It is worth noting that in other alternative embodiments, by changing the relative positions of the shaft body 1 and the liquid supply pipeline 2, the shaft body 1 and the liquid supply pipeline 2 can form an unequal flow resistance structure, so that the oil output of the front and rear oil outlet holes of the motor rotor shaft can be in a specific proportion to meet different cooling requirements.

[0092] When assembling the rotor shaft of this embodiment, the throttle mechanism 6 is first assembled. Specifically, the guide boss 632 of one slider 63 is installed in the slide groove 625 of the mounting seat 62. The spring is passed through the mounting hole 6241, and the hook at one end is hooked on the limit portion 63122. The guide boss 632 of the other slider 63 is then installed in the slide groove 625 of the mounting seat 62, and the hook at the other end of the spring is hooked on the limit portion 63122 of the slider 63. Then, the throttle mechanism 6, the first tube 23, and the second tube 24 are assembled. Specifically, the throttle mechanism 6 is installed in the first tube 23, and one surface of the mounting seat 62 is aligned with the first limit surface 231. The first end of the second tube 24 is then sleeved onto the outer periphery of the second end of the first tube 23. The second tube 24 and the first tube 23 are then bonded and fixed, and the second limit surface 241 is aligned with the other surface of the mounting seat 62. Finally, the liquid supply pipeline 2 with the throttling mechanism 6 is assembled with the shaft body 1. Specifically, the liquid supply pipeline 2 is inserted into the shaft body 1, and clamping rings 8 are respectively installed at both ends of the first tube body 23, so as to fix the liquid supply pipeline 2 with the throttling mechanism 6 in the shaft body 1.

[0093] When the rotor shaft of this embodiment is not rotating, the throttle mechanism 6 is in its initial state. Under the tension of the spring, the two sliders 63 are both at their innermost limit positions within the chute 625. At this point, the throttle opening 61 has its maximum flow area. As the rotor shaft rotates, the two sliders 63 slide outward along the chute 625 under the combined action of centrifugal force and the tension of the spring, thereby reducing the flow area of the throttle opening 61. When the rotor shaft reaches a predetermined speed, the end of the guide boss 632 abuts the inner wall of the first tube 23, and the sliders 63 reach their outermost limit positions. At this point, the throttle opening 61 has its minimum flow area. Furthermore, when the rotor shaft speed exceeds the predetermined speed, the flow area of the throttle opening 61 no longer decreases, ensuring the passage of oil.

[0094] This embodiment also provides a motor, including the above-mentioned rotor shaft.

[0095] The motor of this embodiment can ensure the cooling performance of the motor rotor while avoiding excessive cooling performance of the motor rotor, and at the same time ensure the cooling performance of the motor stator and other oil circuits of the electric drive system.

[0096] The present invention uses a throttling mechanism 6 and an equal flow resistance structure to ensure that the oil output of the rotor shaft is controllable as the motor speed increases, and can make the oil output of the front and rear oil outlet holes (shaft liquid outlet holes 11) of the rotor shaft consistent, so as to solve the problem of uneven cooling and ineffective cooling of the motor at high speed, and ensure that the motor can still maintain a uniform and effective cooling effect at high speed.

[0097] The above embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Any equivalent substitution or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention.

Claims

1. A rotor shaft, characterized in that: include: A shaft body (1) is formed with a central cavity therein, and the shaft body (1) is provided with a shaft liquid outlet hole (11); A liquid supply pipeline (2) is at least partially located in the central cavity and connected to the shaft body (1); the outer wall of the liquid supply pipeline (2) and the inner wall of the shaft body (1) have a fitting position (3); the outer wall of the liquid supply pipeline (2) and the inner wall of the shaft body (1) adjacent to the fitting position (3) are spaced apart to form a first cavity (4); the first cavity (4) is communicated with the shaft liquid outlet (11); a circulation channel (5) is formed in the liquid supply pipeline (2); the liquid supply pipeline (2) is provided with a tube liquid outlet (21) and a liquid inlet (22) spaced apart along the axial direction; the circulation channel (5) is communicated with the first cavity (4) through the tube liquid outlet (21); A throttling mechanism (6) is arranged in the circulation channel (5) and connected to the liquid supply pipeline (2). The throttling mechanism (6) is located between the tube liquid outlet (21) and the liquid inlet (22). The throttling mechanism (6) has a throttling port (61), and the flow area of the throttling port (61) is adjustable.

2. The rotor shaft according to claim 1, characterized in that: The throttling mechanism (6) comprises a mounting seat (62) and a slider (63); the outer periphery of the mounting seat (62) is arranged to fit the inner wall of the liquid supply pipeline (2); the mounting seat (62) is provided with a notch (621) extending through the mounting seat (62) in the axial direction; the slider (63) and the mounting seat (62) are slidably connected to adjust the covering area of the notch (621) by the slider (63); the mounting seat (62), the slider (63) and the liquid supply pipeline (2) jointly define and form the throttling port (61).

3. The rotor shaft according to claim 2, characterized in that: The mounting seat (62) is provided with at least two notches (621) spaced apart from each other, and at least two sliders (63) are provided, and at least two sliders (63) are provided in a one-to-one correspondence with at least two notches (621); the throttling mechanism (6) further comprises an elastic member (64), and both ends of the elastic member (64) are respectively connected to the two sliders (63) arranged opposite to each other.

4. The rotor shaft according to claim 2, characterized in that: The slider (63) comprises a main body (631) and a guide boss (632), wherein the main body (631) is used to cover the notch (621), and the guide boss (632) is connected to the main body (631) and is slidably connected to the mounting seat (62).

5. The rotor shaft according to claim 4, characterized in that: The guide boss (632) is provided at one end close to the liquid supply pipeline (2) and protrudes from the main body (631); and / or, The main body (631) includes a baffle (6311) and a connecting portion (6312), two baffles (6311) are arranged at intervals along the axial direction, the connecting portion (6312) connects the two baffles (6311), and the mounting seat (62) is clamped between the two baffles (6311).

6. The rotor shaft according to any one of claims 1 to 5, characterized in that: The liquid supply pipeline (2) comprises: A first tube body (23) is arranged in the central cavity, with both ends of the first tube body (23) being arranged in contact with the inner wall of the shaft body (1) to form two contact positions (3), a first end of the first tube body (23) being closed, and a second end of the first tube body (23) being arranged through to form a communication port, and the liquid outlet hole (21) being opened in the first tube body (23); A second tube body (24), wherein a first end of the second tube body (24) is connected to the first tube body (23) and communicates with the communication port, and a second end of the second tube body (24) forms the liquid inlet (22).

7. The rotor shaft according to claim 6, characterized in that: The first end of the second tube (24) is sleeved on the second end of the first tube (23) and connected thereto.

8. The rotor shaft according to claim 7, characterized in that: A first limiting surface (231) facing the second limiting surface (24) is formed in the first tube body (23), a second limiting surface (241) facing the first tube body (23) is formed in the second tube body (24), and the throttling mechanism (6) is sandwiched between the first limiting surface (231) and the second limiting surface (241).

9. The rotor shaft according to any one of claims 1 to 5, characterized in that: Two shaft liquid outlet holes (11) are spaced apart on an axis of the surface of the shaft body (1), and the two shaft liquid outlet holes (11) are at the same distance from the tube liquid outlet hole (21) along the axial direction.

10. A motor, characterized in that: Comprising the rotor shaft according to any one of claims 1-9.

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