Motor shaft with good heat dissipation

Abstract

This utility model discloses a motor shaft with good heat dissipation, relating to the field of motor shafts. The key technical points are: it includes a motor shaft body, with a through cavity formed along its axial direction inside the motor shaft body. The inner wall of the cavity has an integrally formed spiral groove extending along the cavity's axial direction. Several protrusions are spaced apart on the side wall of the motor shaft body, evenly distributed along the circumference of the motor shaft body, and each protrusion has an air inlet hole on the side facing the rotation direction of the motor shaft body. Several air outlets communicating with the interior of the cavity are formed on the side of the motor shaft body away from the air inlet holes. This utility model, by forming a complete heat dissipation airflow channel of "air inlet-heat exchange-exhaust," not only shortens the heat dissipation path but also solves the defects of airflow vortices and poor heat dissipation in straight channels of hollow motor shafts through the combination of the spiral airflow channel and the curved air inlet holes, fully meeting the heat dissipation requirements of high-speed, high-load motors.

Description

Technical Field

[0001] This utility model relates to the field of motor shafts, and more specifically, to a motor shaft with good heat dissipation. Background Technology

[0002] During motor operation, the motor shaft, as the core component for power transmission, generates heat due to bearing friction and electromagnetic losses. If this heat cannot be dissipated in time, the motor shaft temperature will rise, which will not only reduce the mechanical properties of the motor shaft (such as decreased strength and hardness), but may also cause bearing lubrication failure, accelerated aging of internal motor components, and other problems, seriously affecting the motor's operational stability and service life. Therefore, the heat dissipation performance of the motor shaft has become one of the key indicators for evaluating the overall performance of the motor. Currently, most motor shafts on the market are solid structures. Their heat dissipation mainly relies on passive cooling from the motor housing or forced air cooling from an internal fan. Heat must be conducted to the surface of the motor shaft itself before exchanging heat with the air. This heat dissipation path is long and inefficient, making it difficult to meet the heat dissipation requirements of high-speed, high-load motors. Although some improved motor shafts have heat dissipation grooves on their surfaces or adopt a hollow structure, the heat dissipation grooves only increase the surface heat dissipation area of ​​the shaft. The hollow structure lacks a design to guide airflow and cannot form a directional heat dissipation channel. Airflow is prone to eddies within the hollow cavity, resulting in limited heat dissipation effect. In addition, the few motor shafts with internal air ducts often have straight channel structures, resulting in poor heat dissipation efficiency.

[0003] In summary, there is still room for improvement in the existing motor shaft design, heat dissipation efficiency, and processing feasibility. There is an urgent need for a motor shaft design that can balance efficient heat dissipation, structural strength, and ease of processing. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a motor shaft with better heat dissipation.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a motor shaft with good heat dissipation, including a motor shaft body, wherein a through cavity is opened inside the motor shaft body along its axial direction, and a spiral pattern ridge extending along the cavity axial direction is integrally formed on the inner wall of the cavity, and the spiral pattern ridge and the inner wall of the cavity enclose a spiral air duct for airflow. The side wall of the motor shaft body is provided with a number of protrusions at intervals. The protrusions are evenly distributed along the circumference of the motor shaft body, and each protrusion has an air inlet hole on the side facing the rotation direction of the motor shaft body. One end of the air inlet hole passes through the protrusion and communicates with the outside, while the other end extends toward the inside of the motor shaft body and communicates with the inside of the cavity. The motor shaft body has several air outlets on the side away from the air inlet at one end, which are connected to the interior of the cavity. The air inlet, spiral air duct, and air outlet are connected in sequence to form a heat dissipation airflow channel.

[0006] The present invention is further configured such that: the air inlet is a curved structure, and the end of the air inlet near the cavity is bent toward the rotation direction of the motor shaft body to form a flow-guiding curved air duct.

[0007] The present invention is further configured such that the outer surface of the protrusion has an arc-shaped structure.

[0008] The present invention is further configured such that: the motor shaft body includes a heat dissipation section with the aforementioned cavity and protrusion, a first solid section located at one end of the heat dissipation section, and a second solid section located at the other end of the heat dissipation section; the heat dissipation section and the first solid section are integrally formed, and the second solid section is fixedly assembled to the end of the heat dissipation section by welding.

[0009] The present invention is further configured such that the second solid segment is provided with a keyway or spline structure.

[0010] The present invention is further configured such that: the motor shaft body is made of 6061-T6 aluminum alloy, and the spiral texture and protrusions are integrally formed from the same material as the motor shaft body.

[0011] In summary, this utility model has the following beneficial effects: by forming a complete heat dissipation airflow channel of "air intake-heat exchange-air exhaust", it not only shortens the heat dissipation path and avoids the problem of low heat dissipation efficiency of the long path of "shaft interior-shaft surface-outside" in traditional solid motor shafts, but also solves the defects of airflow vortex and poor heat dissipation of straight channels in hollow motor shafts through the combination of spiral air duct and curved air intake hole, thus fully meeting the heat dissipation requirements of high speed and high load motors. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention.

[0013] In the diagram: 1. Cavity; 2. Spiral textured edge; 3. Protrusion; 4. Air inlet; 5. Air outlet; 6. Heat dissipation section; 7. First solid section; 8. Second solid section; 9. Keyway. Detailed Implementation

[0014] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0015] A type of motor shaft with good heat dissipation, such as Figure 1As shown, the device includes a motor shaft body made of 6061-T6 aluminum alloy. This material not only possesses excellent mechanical properties, with a tensile strength exceeding 310 MPa and a yield strength exceeding 276 MPa, but also can stably withstand the torque and load during motor operation, avoiding shaft deformation due to insufficient strength and solving the problem of easy damage to some heat-dissipating motor shafts in the background technology. At the same time, its high thermal conductivity of 167 W / (m・K) can quickly conduct the heat generated by bearing friction and electromagnetic loss during motor shaft operation to the inside of the shaft, laying the foundation for subsequent airflow heat dissipation. like Figure 1 and Figure 2 As shown, the motor shaft body is divided into three sections: a heat dissipation section 6 with a cavity 1 and protrusions 3, a first solid section 7 located at the right end of the heat dissipation section 6, and a second solid section 8 located at the left end of the heat dissipation section 6. The heat dissipation section 6 and the first solid section 7 are integrally formed, and the second solid section 8 is fixedly assembled to the left end of the heat dissipation section 6 by welding. Compared with the traditional integrally formed motor shaft, this segmented design eliminates the need for deep hole machining from both ends of the shaft body. The internal cavity 1 can be directly machined from the open end of the left end of the heat dissipation section 6, which greatly reduces the machining difficulty and cost of the cavity 1 and the spiral groove ridge 2 on the inner wall. Furthermore, the welded connection is inspected to ensure that there are no false welds or cracks, ensuring the overall strength of the shaft body. At the same time, a keyway 9 is machined on the outer peripheral wall of the second solid section 8, which can precisely match the motor coupling to ensure the stability of power transmission and avoid additional friction and heat generation due to connection deviation. like Figure 1 and Figure 2 As shown, a through cavity 1 is formed inside the heat dissipation section 6 along its axial direction. Spiral grooves 2 extending axially are integrally formed on the inner wall of the cavity 1. These spiral grooves 2, together with the inner wall of the cavity 1, form a spiral air duct for airflow. Compared to the problems of eddy currents easily generated in the non-directional air ducts of hollow motor shafts and the low heat dissipation efficiency of straight-channel air ducts, the spiral air duct guides the airflow to flow spirally along the shaft axis. This not only prolongs the residence time of the airflow in the cavity 1, allowing the airflow to fully contact the inner wall of the cavity 1, but also avoids heat dissipation dead zones caused by airflow turbulence, significantly improving heat exchange efficiency.

[0016] like Figure 1 and Figure 2As shown, two protrusions 3 are spaced apart on the side wall of the heat dissipation section 6. These protrusions 3 are evenly distributed along the circumference of the motor shaft. Each protrusion 3 has an air inlet 4 on the side facing the rotation direction of the motor shaft. The air inlet 4 has a curved structure, with the end near the cavity 1 curving clockwise to form a guided curved air duct. When the motor shaft rotates at high speed, the external airflow can enter the air inlet 4 more smoothly under the guidance of centrifugal force and the curved air duct, reducing the resistance loss when the airflow enters. Compared with the traditional air intake method without a guided structure, the air intake efficiency is improved, providing sufficient airflow for the spiral air duct. At the same time, the outer surface of the protrusion 3 has an arc-shaped structure. The curvature of this arc matches the outer circumferential curvature of the motor shaft body, which can reduce the air resistance when the motor shaft rotates, reduce wind noise, and also guide the airflow smoothly to the air inlet 4, avoiding turbulence from affecting the air intake effect.

[0017] The spiral groove 2 and protrusion 3 of the motor shaft body are integrally formed with the shaft body using the same material to ensure structural stability and thermal conductivity consistency, and to avoid thermal conduction blockage caused by material differences.

[0018] like Figure 1 and Figure 2 As shown, at the end of the heat dissipation section 6 on the motor shaft body away from the air inlet 4, there are two air outlets 5 that communicate with the inside of the cavity 1. These air outlets 5 are evenly distributed along the circumference of the shaft body to ensure that the airflow can be discharged quickly. When the motor is running, the airflow enters from the air inlet 4 of the protrusion 3, is guided through the curved air duct to the spiral air duct inside the cavity 1, and fully exchanges heat with the inner wall of the cavity 1 along the spiral path. After absorbing the heat conducted to the cavity 1 by the motor shaft, it is discharged from the air outlet 5 at the right end, forming a complete heat dissipation airflow channel of "air inlet-heat exchange-exhaust". This channel not only shortens the heat dissipation path, avoiding the problem of low heat dissipation efficiency of the long path of traditional solid motor shafts ("shaft interior - shaft surface - outside"), but also solves the defects of airflow vortex and poor heat dissipation of hollow motor shafts through the combination of spiral air duct and curved air inlet 4. It fully meets the heat dissipation requirements of high speed and high load motors. At the same time, the high strength characteristics of 6061-T6 aluminum alloy ensure that the shaft does not deform during long-term operation, and the keyway 9 connection ensures stable power transmission, achieving a balance between efficient heat dissipation, structural strength and ease of processing.

[0019] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A motor shaft with good heat dissipation, characterized in that: Includes a motor shaft body, wherein a through cavity (1) is provided inside the motor shaft body along its axial direction, and a spiral groove ridge (2) extending along the axial direction of the cavity (1) is integrally formed on the inner wall of the cavity (1), and the spiral groove ridge (2) and the inner wall of the cavity (1) enclose to form a spiral air duct for airflow. The side wall of the motor shaft body is provided with a number of protrusions (3) at intervals. The protrusions (3) are evenly distributed along the circumference of the motor shaft body. Each protrusion (3) has an air inlet hole (4) on the side facing the rotation direction of the motor shaft body. One end of the air inlet hole (4) passes through the protrusion (3) and communicates with the outside, while the other end extends toward the inside of the motor shaft body and communicates with the inside of the cavity (1). The side of the motor shaft body away from the air inlet (4) is provided with several air outlets (5) that communicate with the interior of the cavity (1); The air inlet (4), spiral air duct, and air outlet (5) are connected in sequence to form a heat dissipation airflow channel.

2. The heat-dissipating motor shaft according to claim 1, characterized in that: The air inlet (4) is a curved structure. The end of the air inlet (4) near the cavity (1) is bent in the direction of rotation of the motor shaft body, forming a flow-guiding curved air duct.

3. The heat-dissipating motor shaft according to claim 1, characterized in that: The outer surface of the protrusion (3) has an arc-shaped structure.

4. The heat-dissipating motor shaft according to claim 1, characterized in that: The motor shaft body includes a heat dissipation section (6) with the cavity (1) and protrusion (3) provided, a first solid section (7) located at one end of the heat dissipation section (6) and a second solid section (8) located at the other end of the heat dissipation section (6); the heat dissipation section (6) and the first solid section (7) are integrally formed, and the second solid section (8) is fixedly assembled to the end of the heat dissipation section (6) by welding.

5. The heat-dissipating motor shaft according to claim 4, characterized in that: The second solid section (8) is provided with a keyway (9) or a spline structure.

6. The heat-dissipating motor shaft according to claim 1, characterized in that: The motor shaft body is made of 6061-T6 aluminum alloy, and the spiral groove (2) and protrusion (3) are integrally formed from the same material as the motor shaft body.

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