Radial air cooling motor casing, motor and vehicle

Abstract

The utility model discloses a radial air-cooled motor casing, which is applied to a vehicle-mounted motor and comprises a cylindrical casing, bosses arranged at two ends of the casing and radiating fins positioned on the outer wall surface of the casing, and the radiating fins are of circular ring structures, circular arc structures or elliptical arc structures. The plurality of radiating fins are arranged on the outer wall surface of the shell at intervals along the axis direction of the shell; the cross sections of the cooling fins are similar to trapezoids, and the cross sections of the cooling fins are gradually reduced from the side close to the machine shell to the side away from the machine shell. A plurality of radiating fins with circular ring structures, circular arc structures or elliptical arc structures are arranged on a casing at intervals along the length direction of the casing, and gaps among the radiating fins are in the same direction as air flow, so that the air flow generated in the running process of a vehicle flows along the gaps among the radiating fins and extends to a certain range of the leeside of the casing; the cooling effect brought by the wind speed generated by the new energy motor in the vehicle running process can be effectively utilized.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a radial air-cooled motor housing, a motor, and a vehicle. Background Technology

[0002] Electric motors are common industrial drive devices, and they need to continuously dissipate the heat generated inside during operation. To effectively dissipate heat from the internal components of the motor and extend its lifespan, numerous heat dissipation fins are installed on the outer side of the motor housing. Existing heat dissipation fins are mainly arranged along the motor's axial direction on the motor housing, which provides relatively good heat dissipation for motors in stationary operation.

[0003] However, many existing motors are used in new energy vehicles, where a significant airflow is generated around the motor during vehicle operation. If the aforementioned axially arranged heat dissipation fins on the motor housing are used to cool the motor, it is impossible to maximize the use of the airflow generated around the vehicle during driving. Furthermore, the casting efficiency, process difficulty, and cost of the motor housing must also be considered during casting. Utility Model Content

[0004] To address the aforementioned deficiencies in existing technologies, a radial air-cooled motor housing, motor, and vehicle are provided, which improves the heat dissipation capacity of the motor in the vehicle; and can be die-cast in one step, thereby improving the production efficiency of the motor housing.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] Firstly, a radial air-cooled motor housing, used in vehicle motors, is characterized by comprising a cylindrical housing, bosses at both ends of the housing, and heat dissipation fins on the outer wall of the housing. The heat dissipation fins are in the form of a ring structure, an arc structure, or an elliptical arc structure, and a plurality of heat dissipation fins are spaced apart on the outer wall of the housing along the axial direction of the housing.

[0007] The heat dissipation fins have a trapezoidal cross-section, with the cross-section gradually decreasing from the side closest to the casing to the side furthest from the casing.

[0008] According to the above technical solution, the housing, fins, and bosses are integrally pressure-cast.

[0009] According to the above technical solution, it also includes a stamped surface, which is set on the casing, and the two ends of the arc-shaped heat dissipation fins are respectively connected to the two sides of the stamped surface.

[0010] According to the above technical solution, the spacing between heat dissipation fins shall not be less than 4mm; the included angle between the two sides of the heat dissipation fin cross-section shall not be less than 3°.

[0011] According to the above technical solution, the thickness of the heat dissipation fin root and the height of the heat dissipation fin are determined based on the thickness of the casing.

[0012] If the thickness of the casing is 2mm to 4mm (excluding 4mm), the root of the heat dissipation fins is 1.5mm, and the height of the heat dissipation fins is not less than 6mm.

[0013] If the thickness of the casing is 4mm to 6mm (excluding 6mm), the root of the heat dissipation fins is 2mm, and the height of the heat dissipation fins is not less than 8mm.

[0014] If the thickness of the casing is 6mm to 8mm (excluding 8mm), the root of the heat dissipation fins is 2.5mm, and the height of the heat dissipation fins is not less than 8mm.

[0015] If the thickness of the casing is 8mm~10mm (excluding 10mm), the root of the heat dissipation fins is 3mm, and the height of the heat dissipation fins is not less than 10mm.

[0016] If the thickness of the casing is 10mm or more, the root of the heat dissipation fins should be 4mm, and the height of the heat dissipation fins should not be less than 10mm.

[0017] According to the above technical solution, the top of the heat dissipation fins is arc-shaped; there is a rounded corner between the heat dissipation fins and the outer wall of the casing, and the radius of the rounded corner is not less than 2mm.

[0018] According to the above technical solution, the boss is provided with mounting holes, positioning holes, and marking grooves. Several mounting holes are provided through the two end faces of the boss, and the positioning holes are provided between two of the mounting holes. The centers of all mounting holes and positioning holes fall on the same circle. The marking groove is provided on the circumferential outline of the boss and extends through the two end faces of the boss.

[0019] According to the above technical solution, a demolding angle is provided on the end face of the boss near the heat dissipation fins, and the demolding angle is not less than 1.5°; the thickness of the boss is not less than 20mm.

[0020] Secondly, the motor housing adopts the radial air-cooled motor housing as described above.

[0021] Thirdly, the vehicle is equipped with a motor, which uses a radial air-cooled motor housing as described above. If the motor housing has a stamped surface, the stamped surface faces the direction in which the vehicle is moving.

[0022] This utility model has the following beneficial effects:

[0023] 1. Multiple ring-shaped, arc-shaped, or elliptical arc-shaped heat dissipation fins are spaced along the length of the casing. Since the gaps between the fins are in the same direction as the airflow, the airflow generated during vehicle operation flows along these gaps and extends to a certain range on the leeward side of the casing. This effectively utilizes the cooling effect of the wind speed generated by the new energy motor during vehicle operation. Furthermore, simulation comparisons show that, compared to an air-cooled motor with axial heat dissipation fins, the airflow generated by vehicle operation covers a 25% larger area on the casing surface, effectively improving the motor's heat dissipation capacity. This increases the motor's power density (power per unit weight) while maintaining motor performance.

[0024] 2. The radial heat dissipation fins and bosses of the casing are integrally pressure-cast. Pressure casting has relatively high production efficiency and low mass production cost.

[0025] 3. Set up a steel stamp surface for engraving permanent steel stamp markings on new energy motors and affixing new energy motor barcodes, etc.

[0026] 4. Ensure a certain gap between the heat dissipation fins to ensure smooth natural convection; the heat dissipation fins are angled and the thickness gradually decreases from the root to the top, so that the heat dissipation fins can absorb enough heat from the heat source part and quickly transfer it to the surrounding thinner parts; at the same time, the heat dissipation fins are angled to facilitate demolding.

[0027] 5. The heat dissipation fins must have a certain height to ensure sufficient heat dissipation volume. The base of the heat dissipation fins must have a certain thickness to ensure the strength of the fins and prevent breakage at the base.

[0028] 6. The top of the heat dissipation fins is rounded, which improves the strength of the top of the heat dissipation fins and prevents the heat dissipation fins from being bumped and deformed during transportation and prevents injury from sharp metal corners; there are rounded corners between the heat dissipation fins and the outer wall of the casing to prevent stress concentration from causing the heat dissipation fins to crack. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment provided by this utility model;

[0030] Figure 2 This is a detailed view of the heat dissipation fins provided in an embodiment of this utility model;

[0031] Figure 3 This is a detailed drawing of the steel stamped surface of the casing according to an embodiment of this utility model;

[0032] Figure 4 This is a detailed view of the housing mounting boss provided in an embodiment of this utility model;

[0033] In the diagram, 1. Housing; 2. Boss; 2-1. Mounting hole; 2-2. Positioning hole; 2-3. Marking groove; 2-4. Demolding angle; 3. Heat sink fins; 4. Stamped surface; A. Heat sink fin height; B. Spacing between heat sink fins; C. Root thickness of heat sink fins; D. Rounded corner where the root of the heat sink fins contacts the housing; E. Rounded arc at the top of the heat sink fins; F. Angle between the two sides of the heat sink fins; G. Thickness of the housing. Detailed Implementation

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Reference Figures 1-4 As shown, this utility model provides a radial air-cooled motor housing.

[0036] Example 1

[0037] It is used in vehicle motors and includes a cylindrical housing 1, bosses 2 at both ends of the housing, and heat dissipation fins 3 on the outer wall of the housing. The heat dissipation fins are in the form of a ring structure, an arc structure, or an elliptical arc structure. Several heat dissipation fins are arranged at intervals along the axial direction of the housing on the outer wall of the housing.

[0038] The heat dissipation fins have a trapezoidal cross-section, with the cross-section gradually decreasing from the side closest to the casing to the side furthest from the casing.

[0039] In this embodiment, multiple ring-shaped, arc-shaped, or elliptical arc-shaped heat dissipation fins are spaced apart along the length of the housing. Since the gaps between the heat dissipation fins are in the same direction as the airflow, the airflow generated during vehicle operation flows along these gaps and extends to a certain range on the leeward side of the housing. This effectively utilizes the cooling effect of the wind speed generated by the new energy motor during vehicle operation. Furthermore, simulation comparisons show that, compared to an air-cooled motor with axial heat dissipation fins, the airflow generated by the vehicle's operation covers a 25% larger area on the housing surface, effectively improving the motor's heat dissipation capacity. This increases the motor's power density (power per unit weight) while maintaining motor performance.

[0040] In Example 1, the housing, fins, and bosses are integrally pressure-cast. Preferably, the axis of the heat dissipation fins coincides with the axis of the housing. The radial heat dissipation fins of the housing are pressure-cast, which has relatively high production efficiency and low mass production cost. The pressure casting material is generally A380 or ADC12.

[0041] ADC12 is a Japanese alloy designation, also known as No. 12 aluminum alloy. It is an Al-Si-Cu alloy, a type of die-cast aluminum alloy, conforming to the standard JS H5302-2006 "Aluminum Alloy Die Castings". ADC12 is equivalent to the Chinese domestic alloy designation YL113, with the alloy grade YZAlSi11Cu3, conforming to the standard GBT 15115-2009. Its tensile strength is 230 MPa. A380 is an American alloy designation, also an Al-Si-Cu alloy, a type of die-cast aluminum alloy, conforming to the standard ASTM B85-3 "Aluminum Alloy Die Castings". A380 is equivalent to the Chinese domestic alloy designation YL112, with the alloy grade YZAISi9Cu4, conforming to the standard GBT 15115-2009. Its tensile strength is 320 MPa.

[0042] Example 2

[0043] The structure and principle of Example 2 are similar to those of Example 1, except that it also includes a steel stamp surface 4 for engraving permanent steel stamp markings on the new energy motor and affixing new energy motor barcodes, etc. The steel stamp surface is located on the housing, and the two ends of the arc-shaped heat dissipation fins are respectively connected to the two sides of the steel stamp surface. The steel stamp surface is formed in one piece by casting, without the need for additional processing, thus improving production efficiency.

[0044] In Examples 1-2, the spacing between the heat dissipation fins is not less than 4mm, and a certain spacing (as shown in dimension B in the figure) is ensured between the heat dissipation fins to ensure smooth natural convection; the included angle between the two sides of the heat dissipation fin cross-section is not less than 3° (as shown in dimension F in the figure), and the heat dissipation fins have an angle (as shown in angle F in the figure), and the thickness gradually decreases from the root to the top, so that the heat dissipation fins can absorb enough heat from the heat source part and quickly transfer it to the surrounding thinner parts; at the same time, the heat dissipation fins have a certain angle to facilitate demolding; the angle is recommended to be 6°.

[0045] Based on the thickness of the casing (as shown in dimension G in the figure), determine the thickness of the heat sink fin root and the height of the heat sink fins.

[0046] The heat sink fins need to maintain a certain height (as shown in dimension A in the figure) to ensure sufficient heat dissipation volume; however, the fin height cannot be too high, as this will hinder heat transfer at the front end, preventing efficiency gains even with increased volume. Furthermore, excessive height will lead to structural and manufacturing difficulties. The base of the heat sink fins must have a certain thickness (as shown in dimension C in the figure) to ensure sufficient strength and prevent breakage at the base. Based on this, and considering the thickness of the casing, an optimal range for the fin height and base thickness is provided.

[0047] If the thickness of the casing is 2mm to 4mm (inclusive of 2mm, exclusive of 4mm), the root of the heat dissipation fins is 1.5mm, and the height of the heat dissipation fins is not less than 6mm.

[0048] If the thickness of the casing is 4mm to 6mm (excluding 6mm), the root of the heat dissipation fins is 2mm, and the height of the heat dissipation fins is not less than 8mm.

[0049] If the thickness of the casing is 6mm to 8mm (excluding 8mm), the root of the heat dissipation fins is 2.5mm, and the height of the heat dissipation fins is not less than 8mm.

[0050] If the thickness of the casing is 8mm~10mm (excluding 10mm), the root of the heat dissipation fins is 3mm, and the height of the heat dissipation fins is not less than 10mm.

[0051] If the thickness of the casing is 10mm or more, the root of the heat dissipation fins should be 4mm, and the height of the heat dissipation fins should not be less than 10mm.

[0052] Example 3

[0053] The structure and principle of Example 3 are similar to those of Example 1, except that the top of the heat dissipation fins is rounded (as shown in dimension E in the figure), which improves the strength of the top of the heat dissipation fins and prevents the heat dissipation fins from being bumped and deformed during transportation and prevents injury from sharp metal corners; there is a rounded corner between the heat dissipation fins and the outer wall of the casing (as shown in dimension D in the figure), and the radius of the rounded corner is not less than 2mm, that is, the root of the heat dissipation fins is designed with a rounded corner to prevent stress concentration from causing the heat dissipation fins to crack.

[0054] Example 4

[0055] The structure and principle of Embodiment 4 are similar to those of Embodiment 1, except that: The boss has mounting holes 2-1, positioning holes 2-2, and marking grooves 2-3. Several mounting holes are provided through the two end faces of the boss, and the positioning holes are located between two of the mounting holes. The centers of all mounting holes and positioning holes fall on the same circle. The marking groove is located on the circumferential contour of the boss and extends through the two end faces of the boss. The mounting holes and positioning holes are used to connect or position the front and rear end covers, and the marking groove positions the machine housing.

[0056] Preferably, the boss has a demolding angle of 2-4 near the end face of the heat dissipation fins, and the demolding angle is not less than 1.5°; the thickness of the boss is not less than 20mm, so as to leave more axial dimensions to arrange more heat dissipation fins.

[0057] The housing cavity is also designed with front and rear end cover mating stops and stator core mating surfaces; because the stator core and housing adopt an interference fit, the housing cavity needs to have a certain thickness to prevent cracks from appearing in the housing cavity during the heat fitting process, which would make it impossible to guarantee the motor sealing requirements.

[0058] This utility model also provides a motor, the housing of which adopts the radial air-cooled motor housing as described above.

[0059] This utility model also provides a vehicle equipped with a motor. The motor uses a radial air-cooled motor housing as described in any of the claims. If the motor housing has a stamped surface, the stamped surface faces the direction in which the vehicle is moving. Considering that the heat dissipation effect of the leeward side of the housing is not as good as that of the windward side when the vehicle is running, the stamped surface of the housing needs to face the direction in which the vehicle is moving during motor installation to compensate for the lack of heat dissipation fins on the stamped surface, which results in poor heat dissipation.

[0060] The above are merely preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the protection scope of the present utility model.

Claims

1. A radially air-cooled motor housing, used in automotive motors, characterized in that: It includes a cylindrical housing, bosses at both ends of the housing, and heat dissipation fins on the outer wall of the housing. The heat dissipation fins are in the form of a ring structure, an arc structure, or an elliptical arc structure. Several heat dissipation fins are arranged at intervals along the axial direction of the housing on the outer wall of the housing. The heat dissipation fins have a trapezoidal cross-section, with the cross-section gradually decreasing from the side closest to the casing to the side furthest from the casing.

2. The radial air-cooled motor housing according to claim 1, characterized in that: The housing, fins, and bosses are formed by integral pressure casting.

3. The radial air-cooled motor housing according to claim 1, characterized in that: It also includes a stamped surface, which is located on the casing, with the two ends of the arc-shaped heat dissipation fins connected to both sides of the stamped surface.

4. The radial air-cooled motor housing according to claim 1, characterized in that: The spacing between heat dissipation fins shall not be less than 4mm; the included angle between the two sides of the heat dissipation fin cross-section shall not be less than 3°.

5. The radial air-cooled motor housing according to claim 1, characterized in that: Determine the thickness of the heat dissipation fins at the base and the height of the heat dissipation fins based on the thickness of the casing. If the thickness of the casing is 2mm to 4mm (excluding 4mm), the root of the heat dissipation fins is 1.5mm, and the height of the heat dissipation fins is not less than 6mm. If the thickness of the casing is 4mm to 6mm (excluding 6mm), the root of the heat dissipation fins is 2mm, and the height of the heat dissipation fins is not less than 8mm. If the thickness of the casing is 6mm to 8mm (excluding 8mm), the root of the heat dissipation fins is 2.5mm, and the height of the heat dissipation fins is not less than 8mm; If the thickness of the casing is 8mm to 10mm (excluding 10mm), the root of the heat dissipation fins is 3mm, and the height of the heat dissipation fins is not less than 10mm. If the thickness of the casing is 10mm or more, the root of the heat dissipation fins should be 4mm, and the height of the heat dissipation fins should not be less than 10mm.

6. The radial air-cooled motor housing according to claim 4, characterized in that: The top of the heat dissipation fins is rounded; there are rounded corners between the heat dissipation fins and the outer wall of the casing, and the radius of the rounded corners is not less than 2mm.

7. The radial air-cooled motor housing according to claim 1, characterized in that: The boss is provided with mounting holes, positioning holes, and marking grooves. Several mounting holes are provided through the two end faces of the boss, and positioning holes are provided between two of the mounting holes. The centers of all mounting holes and positioning holes fall on the same circle. The marking groove is provided on the circumferential outline of the boss and extends through the two end faces of the boss.

8. The radial air-cooled motor housing according to claim 1 or 7, characterized in that: The boss has a demolding angle near the end face of the heat sink fins, and the demolding angle is not less than 1.5°; the thickness of the boss is not less than 20mm.

9. An electric motor, characterized in that: The motor housing adopts the radial air-cooled motor housing as described in any one of claims 1-8.

10. A vehicle, characterized in that: The vehicle is equipped with a motor, which adopts a radial air-cooled motor housing as described in any one of claims 1-8. If the motor housing has a stamped surface, the stamped surface faces the direction in which the vehicle is moving.

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