High-rotating-speed stable new energy vehicle driving motor shaft

Abstract

The utility model relates to new energy automobile drive motor part technical field provides a high -speed stable new energy automobile drive motor axle, including heat conduction inner layer and fixed connection in heat conduction inner layer outer ring's high hardness outer layer, high hardness outer layer both ends are equipped with front balance ring and rear balance ring respectively, inside passes through the oil -guide thread drive lubricating oil circulation heat dissipation, heat conduction inner layer extension end is equipped with rear gear and rear thread, high hardness outer layer end part is equipped with front gear and front thread, the utility model discloses through heat conduction inner layer and high hardness outer layer double -deck composite structure, solved the problem that single material cannot give consideration to heat dissipation and wear -resisting, oil -guide thread realizes active oil cooling circulation, effectively reduces the axle core temperature, double balance ring design has improved the dynamic balance stability when high -speed operation significantly, thereby prolongs the service life of motor axle and has improved the running stability.

Description

Technical Field

[0001] This utility model relates to the technical field of drive motor components for new energy vehicles, and in particular to a high-speed stable drive motor shaft for new energy vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the drive motor, as the core power source of the vehicle, has increasingly higher requirements for power density and operating efficiency. In order to meet the power demand of high-speed driving and instantaneous acceleration, the drive motor needs to maintain extremely high speed. However, as a key component for transmitting torque and supporting the rotor, the motor shaft not only has to withstand severe mechanical friction and alternating stress under high-speed conditions, but also generates a lot of heat due to high-speed rotation.

[0003] Existing drive motor shafts are made of a single alloy steel material. This single-material design, with its solid and hollow structures, makes it difficult to simultaneously meet the dual requirements of high surface hardness and wear resistance, as well as high thermal conductivity in the core. Specifically, if a high-hardness material is selected to ensure wear resistance at the journal and gear connection, the thermal conductivity of the material will be low. This makes it difficult for the heat generated inside the motor to be quickly conducted away through the shaft during high-speed operation, causing heat to accumulate in the shaft core and leading to excessive temperature rise. This not only reduces the performance of the motor magnets, but in severe cases, it can even lead to bearing failure and shaft seizure. In addition, the existing motor shaft structure lacks an active internal cooling circulation mechanism and a dynamic balance adjustment structure specifically designed for ultra-high speeds. This results in slight vibrations during high-speed operation, further affecting the stability and lifespan of the motor.

[0004] Therefore, this utility model proposes a high-speed stable new energy vehicle drive motor shaft to overcome the shortcomings of the prior art. Utility Model Content

[0005] In view of the problems existing in the new energy vehicle drive motor shaft, such as the difficulty in simultaneously achieving high surface hardness and wear resistance with efficient heat dissipation of the core using a single material, the tendency for internal heat accumulation during high-speed rotation to lead to excessive temperature rise, and the lack of an active dynamic balancing adjustment structure resulting in large operating vibration and poor stability, this utility model aims to provide a high-speed stable new energy vehicle drive motor shaft with an improved structure that can effectively solve the above problems.

[0006] This utility model provides a high-speed stable new energy vehicle drive motor shaft, including a heat-conducting inner layer and a high-hardness outer layer fixedly connected to the outer ring of the heat-conducting inner layer.

[0007] The high-hardness outer layer has a front thread fixedly connected to one end, a front gear fixedly connected to one end, an inner ring of a front balance ring fixedly connected to the end of the high-hardness outer layer near the front gear, and a rear balance ring fixedly connected to the end of the high-hardness outer layer away from the front gear. With this structural layout, the balance rings connected to both ends of the high-hardness outer layer effectively counteract the eccentric torque when the shaft rotates at high speed, thereby ensuring the smooth operation of the motor shaft.

[0008] Furthermore, the high-hardness outer layer extends from the end of the heat-conducting inner layer away from the front gear and is fixedly connected to the rear gear. One end of the heat-conducting inner layer is fixedly connected to the rear thread. An oil guide hole is opened inside the heat-conducting inner layer, and an oil guide thread is provided inside the oil guide hole. An installation groove is opened at one end of the heat-conducting inner layer, and a sealing ring is installed in the installation groove. When the motor shaft rotates at high speed, the oil guide thread can drive the internal fluid to flow in a specific direction by utilizing the spiral pumping effect, thereby realizing active oil cooling circulation heat dissipation.

[0009] Preferably, a front protective pad is provided on the side of the front thread away from the high-hardness outer layer, and a groove matching the shape of one end of the motor shaft is formed in the front protective pad. A rear protective pad is provided on the side of the rear thread away from the heat-conducting inner layer, and a groove matching the shape of the other end of the motor shaft is formed in the rear protective pad. The front and rear protective pads can tightly cover and wrap the precision structure at both ends of the motor shaft, absorb external impact during transportation, and prevent the gears and threads from being damaged by bumps.

[0010] Preferably, the inner ring of the high-hardness outer layer and the outer ring of the heat-conducting inner layer are fixedly connected by an interference fit. This tight connection ensures that there is no relative slippage between the inner and outer layers under high speed and high torque conditions, thus guaranteeing the overall rigidity of the double-layer composite structure and the reliability of power transmission.

[0011] Preferably, the front thread, the front gear, and the high-hardness outer layer are integrally formed. This integral structural design eliminates stress concentration at the connection interface and significantly improves the mechanical strength and fatigue resistance of the transmission part at the front end of the motor shaft.

[0012] Preferably, the rear gear, the rear thread, and the heat-conducting inner layer are integrally formed. Similarly, this design ensures the structural integrity and durability of the power output part at the rear end of the motor shaft.

[0013] Preferably, the front balance ring and the high-hardness outer layer are fixedly connected by welding, and the rear balance ring and the high-hardness outer layer are fixedly connected by welding. The welding process can provide a strong bonding force, prevent the balance ring from loosening or falling off under the action of high-speed centrifugal force, and ensure the long-term effectiveness of dynamic balance adjustment.

[0014] Preferably, the oil guide thread is spirally distributed along the axial direction of the oil guide hole, and the direction of the oil guide thread is configured to drive the internal fluid to flow axially when the motor shaft rotates. Through this structural design, the rotational motion of the motor shaft itself is cleverly utilized as a power source, and the internal cooling oil can be circulated without the need for an additional pumping device, thereby improving the system's integration and heat dissipation efficiency.

[0015] Preferably, the heat-conducting inner layer is made of a high thermal conductivity copper alloy or aluminum alloy. The excellent thermal conductivity of these materials can quickly dissipate heat from the shaft core, preventing high temperatures from affecting the motor performance.

[0016] Preferably, the high-hardness outer layer is made of wear-resistant alloy steel. The extremely high surface hardness of this material can effectively resist mechanical friction and wear caused by long-term operation, thus extending the service life of the motor shaft.

[0017] This utility model has the following beneficial effects:

[0018] 1. This utility model solves the problem that existing single-material motor shafts cannot simultaneously achieve efficient heat dissipation of the core and high wear resistance of the surface by setting a double-layer composite structure in which a heat-conducting inner layer and a high-hardness outer layer are tightly fitted. It achieves the effect of using the high thermal conductivity material of the inner layer to quickly conduct heat and avoid heat accumulation, and using the high-hardness material of the outer layer to withstand long-term mechanical friction without affecting dimensional accuracy, thereby significantly extending the service life of the motor shaft under high load conditions.

[0019] 2. This utility model solves the problem of excessively high temperature caused by the difficulty of dissipating the core heat of the motor shaft through natural conduction when it rotates at high speed by opening an oil guide hole with an oil guide thread inside the heat-conducting inner layer. It achieves the effect of using the spiral pumping effect generated by the rotation of the motor shaft itself to drive the internal lubricating oil to flow and circulate in a specific direction, actively carrying the core heat out of the shaft, and ensuring that the motor shaft can maintain the normal operating temperature range for a long time.

[0020] 3. This utility model solves the problem of centrifugal vibration and instability of the motor shaft when it runs at extremely high speed by fixing the front balance ring and the rear balance ring to both ends of the high-hardness outer layer. It effectively counteracts the eccentric torque during rotation, significantly improves the dynamic balance performance of the motor shaft, and enables it to adapt to higher speed requirements while maintaining smooth and low-noise operation. Attached Figure Description

[0021] Figure 1 A perspective view of a high-speed stable new energy vehicle drive motor shaft proposed in this utility model;

[0022] Figure 2This is a schematic diagram of the structure of a high-speed stable new energy vehicle drive motor shaft proposed in this utility model;

[0023] Figure 3 This is a cross-sectional view of the high-hardness outer layer in a high-speed stable new energy vehicle drive motor shaft proposed in this utility model.

[0024] Figure 4 This is a cross-sectional view of the heat-conducting inner layer in the shaft of a high-speed stable new energy vehicle drive motor proposed in this utility model.

[0025] Legend:

[0026] 1. Front protective pad; 2. Front thread; 3. Front gear; 4. Front balance ring; 5. High-hardness outer layer; 6. Rear balance ring; 7. Rear gear; 8. Rear thread; 9. Rear protective pad; 10. Oil guide hole; 11. Sealing ring; 12. Oil guide thread; 13. Mounting groove; 14. Heat-conducting inner layer. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0028] Example:

[0029] Please refer to Figures 1 to 4 This utility model provides a high-speed stable new energy vehicle drive motor shaft, which aims to solve the structural defects of existing new energy vehicle drive motor shafts that are difficult to balance high surface wear resistance and efficient heat dissipation of the core under high-speed conditions, as well as the structural defects that easily generate vibration and heat accumulation during high-speed rotation, thus affecting the service life and stability of the motor.

[0030] like Figure 1 and Figure 2As shown, the main structure of the high-speed stable new energy vehicle drive motor shaft includes a heat-conducting inner layer 14 and a high-hardness outer layer 5 fixedly sleeved on the outer circumference of the heat-conducting inner layer 14 by an interference fit. The heat-conducting inner layer 14, as the core body of the motor shaft, is used to quickly conduct heat and support the overall structure. It is made of materials with excellent thermal conductivity, such as high thermal conductivity copper alloy or aluminum alloy, which can ensure that the heat generated by the motor shaft during operation is dissipated in time, avoiding the accumulation of heat inside the motor shaft and affecting the normal operation of the device. The high-hardness outer layer 5, as the outer sheath of the motor shaft, is used to withstand mechanical friction and install external components. It is made of materials with high surface hardness, such as wear-resistant alloy steel, which can withstand long-term friction without affecting normal use, thereby ensuring the dimensional accuracy and durability of the motor shaft under high load.

[0031] The thermally conductive inner layer 14 and the high-hardness outer layer 5 are combined to form a double-layer composite structure shaft. The inner ring of the high-hardness outer layer 5 is tightly fitted and fixed to the outer ring of the thermally conductive inner layer 14. Through this structural layout of soft inner and hard outer, thermally conductive inner and wear-resistant outer, the motor shaft has both the rigidity and hardness required to cope with external mechanical stress and excellent internal thermal management capabilities. The axial length of the thermally conductive inner layer 14 is designed to be greater than the axial length of the high-hardness outer layer 5, so that one end of the thermally conductive inner layer 14 can extend out to the high-hardness outer layer 5 for the installation of subsequent transmission components. This layered design constitutes the basic technical platform for this device to achieve stable high-speed operation.

[0032] To address the heat dissipation and stability issues of new energy vehicle motor shafts at high speeds, the core of this embodiment's technical solution lies in the active oil-cooling circulation structure constructed within the heat-conducting inner layer 14 to stabilize the high-speed new energy vehicle drive motor shaft. Furthermore, dynamic balancing components are configured at both ends of the high-hardness outer layer 5. One end of the high-hardness outer layer 5 is fixedly connected to a front thread 2, and a front gear 3 is fixedly connected to the same end of the high-hardness outer layer 5, located inside the front thread 2. The front thread 2 and the front gear 3 facilitate the installation of the motor shaft's front end onto the motor system and the transmission of power. The front thread 2, the front gear 3, and the high-hardness outer layer 5 are preferably integrally formed to ensure connection strength. The inner ring of a front balance ring 4 is fixedly connected to the outer circumference of the high-hardness outer layer 5, adjacent to the front gear 3. The front balance ring 4 is fixedly connected to the high-hardness outer layer 5 by welding. The function of the front balance ring 4 is to provide dynamic balance counterweight at the front end during motor shaft rotation, making the motor shaft more stable during rotation and capable of adapting to higher speed requirements.

[0033] Please refer to Figure 2 and Figure 3A rear balance ring 6 is fixedly connected to the outer circumference of the high-hardness outer layer 5 away from the front gear 3. The rear balance ring 6 is also fixedly connected to the high-hardness outer layer 5 by welding. The rear balance ring 6 and the front balance ring 4 together form a double-sided balance system of the motor shaft. The two balance rings connected to both ends of the high-hardness outer layer 5 can effectively counteract the eccentric torque generated when the shaft rotates at high speed, ensuring the smooth operation of the motor shaft. The end of the heat-conducting inner layer 14 away from the front gear 3 extends out of the outside of the high-hardness outer layer 5 and is fixedly connected to the rear gear 7. The end of the heat-conducting inner layer 14 located outside the rear gear 7 is fixedly connected to the rear thread 8. The rear gear 7 and the rear thread 8 are used for power output and installation and fixation at the rear end of the motor shaft. The rear gear 7, the rear thread 8 and the heat-conducting inner layer 14 are preferably integrally formed.

[0034] Please refer to Figure 2 and Figure 4 To achieve efficient active heat dissipation, an oil guide hole 10 is provided through the interior of the heat-conducting inner layer 14 along the axial direction. An oil guide thread 12 is provided on the inner peripheral wall of the oil guide hole 10. The oil guide thread 12 is continuously spirally distributed along the axial direction of the oil guide hole 10, and the direction of rotation of the oil guide thread 12 is configured to drive the internal cooling lubricating oil to move in one direction by means of the spiral pumping effect when the motor shaft rotates at high speed, thereby driving the heat out of the motor shaft, so that the motor shaft can work normally for a long time. An installation groove 13 is provided on the end face of the heat-conducting inner layer 14 away from the front gear 3. A sealing ring 11 is installed inside the installation groove 13. The sealing ring 11 is fixed in the installation groove 13 by embedding to seal the circulating lubricating oil, prevent lubricating oil leakage, and ensure the reliable operation of the oil cooling system.

[0035] In a preferred embodiment, to enhance the protection of the motor shaft during transportation and prevent damage to the precision threads and gear structure, a front protective pad 1 is provided on the side of the front thread 2 away from the high-hardness outer layer 5. The side of the front protective pad 1 facing the front thread 2 has a groove that matches the shape of the front thread 2 and the front gear 3, so that the front protective pad 1 can tightly cover and wrap the key front part of the motor shaft. A rear protective pad 9 is provided on the side of the rear thread 8 away from the heat-conducting inner layer 14. The side of the rear protective pad 9 facing the rear thread 8 has a groove that matches the shape of the rear thread 8 and the rear gear 7, so that the rear protective pad 9 can tightly cover and wrap the key rear part of the motor shaft. The front protective pad 1 and the rear protective pad 9 can effectively absorb impact during transportation and protect the gears and threads on both sides of the motor shaft from being bumped.

[0036] As a preferred embodiment, in order to ensure the high thermal conductivity of the inner layer and the high wear resistance of the outer layer, the material of the thermally conductive inner layer 14 is preferably a high thermal conductivity copper alloy or aluminum alloy. These materials have excellent thermal conductivity coefficients and can quickly conduct the heat of the shaft core to the cooling oil circuit and external structure. The material of the high hardness outer layer 5 is preferably a wear-resistant alloy steel that has undergone heat treatment. After quenching or carburizing, this material has extremely high surface hardness, which can significantly improve the fatigue life and wear resistance of the motor shaft.

[0037] As a preferred embodiment, in order to ensure the reliability of the connection of the double-layer structure, the inner ring of the high-hardness outer layer 5 and the outer ring of the heat-conducting inner layer 14 are fixedly connected by interference fit or heat fitting process. This connection method can generate huge radial contact pressure, ensuring that there will be no relative slippage between the inner and outer layers under high speed and high torque conditions, thus ensuring the synchronization of power transmission and the rigidity of the overall structure.

[0038] Working principle: The installation process is as follows: the front thread 2 is fixedly connected to one end of the high-hardness outer layer 5, the front gear 3 is fixedly connected to one end of the high-hardness outer layer 5, the inner ring of the front balance ring 4 is fixedly connected to the end of the high-hardness outer layer 5 near the front gear 3, the rear balance ring 6 is fixedly connected to the end of the high-hardness outer layer 5 away from the gear, the inner ring of the high-hardness outer layer 5 is fixedly connected to the outer ring of the heat-conducting inner layer 14, the rear gear 7 is fixedly connected to one end of the heat-conducting inner layer 14, the rear thread 8 is fixedly connected to one end of the heat-conducting inner layer 14, the mounting groove 13 is opened at one end of the heat-conducting inner layer 14, the sealing ring 11 is installed in the mounting groove 13, the heat-conducting inner layer 14 has an oil guide hole 10 inside, the oil guide hole 10 has an oil guide thread 12 inside, the front protective pad 1 and the rear protective pad 9 have grooves that match one end of the motor shaft, which can protect the gears and threads on both sides of the motor shaft from being bumped during transportation, thus completing the installation of the motor shaft;

[0039] When the motor shaft is in operation, the high-hardness outer layer 5 of the motor shaft has a high hardness and can withstand friction for a longer period of time without affecting normal use. The motor shaft generates heat during operation, causing the motor shaft temperature to rise. The heat-conducting inner layer 14 uses a material with good thermal conductivity to ensure that the heat generated by the motor shaft during operation can be dissipated in time, avoiding accumulation inside the motor shaft and thus affecting the normal operation of the device. The oil guide hole 10 has an oil guide thread 12. When the motor shaft rotates at high speed, it drives the internal cooling lubricating oil to move in one direction, driving the heat out of the motor shaft so that the motor shaft can work normally for a long time. The sealing ring 11 prevents lubricating oil leakage. The threads and gears on both sides facilitate the installation of the motor shaft on the motor. The two balance rings connected to the high-hardness outer layer 5 make the motor shaft more stable during rotation, allowing the motor shaft to adapt to higher speeds.

Claims

1. A high-speed stable new energy vehicle drive motor shaft, comprising a heat-conducting inner layer (14) and a high-hardness outer layer (5) fixedly connected to the outer ring of the heat-conducting inner layer (14); Its features are, One end of the high-hardness outer layer (5) is fixedly connected to a front thread (2), one end of the high-hardness outer layer (5) is fixedly connected to a front gear (3), one end of the high-hardness outer layer (5) near the front gear (3) is fixedly connected to the inner ring of the front balance ring (4), and one end of the high-hardness outer layer (5) away from the front gear (3) is fixedly connected to a rear balance ring (6). The high-hardness outer layer (5) extends from one end of the thermally conductive inner layer (14) away from the front gear (3) and is fixedly connected to the rear gear (7). The end of the thermally conductive inner layer (14) is fixedly connected to the rear thread (8). The inner heat-conducting layer (14) has an oil guide hole (10) inside, and an oil guide thread (12) is provided inside the oil guide hole (10). One end of the inner heat-conducting layer (14) has an installation groove (13) and a sealing ring (11) is installed in the installation groove (13).

2. The high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The front thread (2) is provided with a front protective pad (1) on the side away from the high hardness outer layer (5), and the front protective pad (1) has a groove that matches the shape of one end of the motor shaft; the rear thread (8) is provided with a rear protective pad (9) on the side away from the heat-conducting inner layer (14), and the rear protective pad (9) has a groove that matches the shape of the other end of the motor shaft.

3. The high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The inner ring of the high-hardness outer layer (5) and the outer ring of the thermally conductive inner layer (14) are fixedly connected by an interference fit.

4. The high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The front thread (2), the front gear (3), and the high-hardness outer layer (5) are integrally formed.

5. A high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The rear gear (7), the rear thread (8), and the heat-conducting inner layer (14) are integrally formed.

6. A high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The front balance ring (4) is fixedly connected to the high-hardness outer layer (5) by welding, and the rear balance ring (6) is fixedly connected to the high-hardness outer layer (5) by welding.

7. A high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The oil guide thread (12) is spirally distributed along the axial direction of the oil guide hole (10), and the direction of rotation of the oil guide thread (12) is configured to drive the internal fluid to flow axially when the motor shaft rotates.

8. A high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The thermally conductive inner layer (14) is made of a high thermal conductivity copper alloy or aluminum alloy.

9. A high-speed stable new energy vehicle drive motor shaft according to claim 1, characterized in that, The high-hardness outer layer (5) is made of wear-resistant alloy steel.

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