Large-torque brushless outer rotor casing assembly

Abstract

The utility model relates to the technical field of brushless motor design, in particular to a large-torque brushless outer rotor casing assembly, which is technically characterized by comprising a casing, a shaft core and a belt pulley, the shaft core is inserted into the casing, one end of the shaft core extends outwards to extend out of the casing, and the other end of the shaft core extends outwards to extend out of the belt pulley. The belt pulley is arranged on the portion, extending on the outer side of the machine shell, of the shaft core in a sleeving mode, the machine shell comprises an end cover, a plurality of kidney-shaped holes are formed in the end cover, the shaft core is cylindrical, and the shaft core and the machine shell are fixed through welding. The casing and the shaft core as well as the shaft core and the belt pulley are fixed in a welding manner, so that the torsion of 30kgf and the thrust of 50kgf between the casing and the shaft core in the prior art are improved to be more than 100kgf, the requirement of large torque is met, the application field of the brushless outer rotor motor, such as sports equipment and the like, is enlarged, and the market share is greatly improved; and through the arrangement of the waist-shaped holes, the motor can form good ventilation and heat dissipation effects.

Description

TECHNICAL FIELD

[0001] The utility model relates to brushless motor design technical field, concretely relates to a big torque brushless outer rotor casing assembly. BACKGROUND

[0002] With the continuous innovation and leap of motor manufacturing technology, modern industry and consumer have put forward more stringent requirements on motor performance. This not only reflects the pursuit of small size and light weight of motor to facilitate integration and carrying, but also emphasizes high efficiency to reduce energy consumption, realizes high-speed constant power operation to adapt to complex working conditions, and has a wide speed regulation range to meet the diversified application requirements. Permanent magnet DC brushless motor, with its excellent performance, outstanding energy efficiency ratio and high reliability, has shown great application potential and value in many fields, especially in high-end household appliances.

[0003] However, under the current technical system, although part of the large torque brushless inner rotor motor is applied in specific fields, its starting torque is relatively small, which is difficult to meet the occasion of some instantaneous large torque output. And for the DC brushless outer rotor motor, although its design can theoretically provide greater torque output, there is no perfect matching large torque casing assembly on the market, which limits the application and promotion of the outer rotor motor in a wider field.

[0004] Under this background, developing a casing assembly that not only has large torque characteristics, but also is perfectly compatible with brushless outer rotor motor, has become a key problem to be solved in the field of motor manufacturing. UTILITY MODEL CONTENTS

[0005] Therefore, the technical problem to be solved by the utility model is that there is a lack of casing assembly that not only has large torque characteristics, but also is perfectly compatible with brushless outer rotor motor in the prior art.

[0006] The above technical purpose of the utility model is realized by the following technical scheme:

[0007] A large torque brushless outer rotor casing assembly, comprising a casing, a shaft core and a belt pulley, the shaft core is inserted into the casing, one end of the shaft core extends out of the casing, the belt pulley is sleeved on the part of the shaft core extending outside the casing, the casing comprises an end cover, a plurality of waist-shaped holes are arranged on the end cover, the shaft core is cylindrical, and the shaft core and the casing are fixed by welding.

[0008] Preferably, the waist-shaped holes extend along the radial direction of the end cover, and the waist-shaped holes are arrayed along the circumferential direction of the end cover.

[0009] Preferably, the shell is a cylindrical shell with one end open, the shell comprises a peripheral side shell and an end cover, the side shell is a cylindrical shell with both ends open, and the end cover is a circular plate arranged, and the end cover is fixed at one end of the side shell in the axial direction.

[0010] Preferably, the end cover is integrally formed with the side shell.

[0011] Preferably, the middle part of the end cover is concave to form a positioning part, and a positioning hole is arranged at the middle position of the positioning part, and the positioning hole is used for positioning the axis.

[0012] Preferably, the positioning hole comprises a positioning wall at the middle position, the positioning wall is arranged in a cylindrical shell, and the positioning wall is sleeved on the outer periphery of the shaft core.

[0013] Preferably, the fixed position of the positioning wall and the shaft core is a first welding point, the first welding point is located at the end of the positioning wall pointing to the outward end and is arranged around the periphery of the positioning wall.

[0014] Preferably, the pulley is sleeved on the outer periphery of the shaft core, the pulley and the shaft core are tightly matched, and the pulley and the shaft core are fixedly connected.

[0015] Preferably, the pulley and the shaft core are fixed by welding, and the welding position of the pulley and the shaft core is a second welding point located at the end of the outwardly extending end cover of the shaft core, and the second welding point is arranged around the outer peripheral wall of the shaft core.

[0016] Preferably, the pulley is fixed on the shaft core by bolts.

[0017] Compared with the prior art, the present application at least has the following beneficial effects:

[0018] In the present application, by increasing the welding process, the torsion of 30kgf and the thrust of 50kgf between the shell and the shaft core on the market are increased to more than 100kgf, which meets the demand of large torque, increases the use field of brushless outer rotor motor, such as sports equipment, and greatly improves the market share;

[0019] In the present application, by increasing the waist-shaped hole, the motor can form good ventilation and heat dissipation effect, and when the motor is running, the internal structure of the motor can be clearly seen through the waist-shaped hole, and the visual comfort is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is an overall structure schematic view of a large-torque brushless outer rotor shell assembly in an embodiment of the present application.

[0021] Figure 2It is a cross section schematic view of a large torque brushless outer rotor shell assembly in one embodiment of the utility model.

[0022] Figure 3 It is a front view of a large torque brushless outer rotor shell assembly in one embodiment of the utility model.

[0023] In the drawing, 1, shell; 11, side shell; 12, end cover; 121, positioning portion; 122, positioning wall; 1221, first welding point; 123, waist-shaped hole; 2, shaft core; 21, second welding point; 3, belt pulley; Specific implementation

[0024] The utility model is further explained in detail in connection with the drawings and embodiments.

[0025] Please refer to Figure 1 、 Figure 2 and Figure 3 A large torque brushless outer rotor shell assembly, including shell 1, shaft core 2 and belt pulley 3, wherein the shaft core 2 is inserted in the shell 1, and one end of the shaft core 2 extends out of the shell 1, and the belt pulley 3 is sleeved on the shaft core 2 extending outside the shell 1.

[0026] Please refer to Figure 1 and Figure 2 , the shell 1 is a cylindrical shell with one end open, the shell 1 includes the side shell 11 of outer circumference and the end cover 12, the side shell 11 is a cylindrical shell with both ends open, the end cover 12 is a circular plate, the end cover 12 is fixed in the axial direction of the side shell 11 one end, and in one embodiment, the end cover 12 is integrally formed with the side shell 11.

[0027] The middle part of the end cover 12 is concave to form a positioning portion 121, the middle position of the positioning portion 121 is provided with a positioning hole, and the positioning hole is used for positioning the axis, and in one embodiment, the positioning hole includes a positioning wall 122 at the middle position, the positioning wall 122 is a cylindrical shell, and the positioning wall 122 is sleeved on the outer periphery of the shaft core 2.

[0028] In one embodiment, please refer to Figure 1 and Figure 3The end cover 12 is provided with a waist-shaped hole 123 extending along the radial direction of the end cover 12, and the waist-shaped hole 123 is arranged in an array along the circumferential direction of the end cover 12. The waist-shaped hole 123 can provide good ventilation for the motor, thereby effectively reducing the temperature of the motor. During operation of the motor, the internal structure of the motor can be seen through the waist-shaped hole 123, so that the user can observe the operation of the motor, and when a fault occurs, the user can promptly troubleshoot.

[0029] In an embodiment, referring to Figure 1 and Figure 2 The shaft core 2 is in a cylindrical shape, one end of the shaft core 2 is inserted into the inside of the casing 1, and the other end extends outwardly to the outer periphery of the end cover 12. The shaft core 2 is embedded in the inside of the positioning wall 122 and fixedly arranged with the positioning wall 122. In an embodiment, the shaft core 2 and the positioning wall 122 are fixed by welding. The fixed position of the positioning wall 122 and the shaft core 2 is a first welding point 1221, which is located at the end of the positioning wall 122 pointing outward and is arranged around the periphery of the positioning wall 122.

[0030] The pulley 3 is sleeved on the outer periphery of the shaft core 2, and the pulley 3 and the shaft core 2 are tightly fitted and fixedly connected.

[0031] Specifically, in an embodiment, the pulley 3 and the shaft core 2 are fixed by welding. The welding method can achieve a thrust force and a torsional force of more than 100 kgf, meeting the requirement of large torque. The welding position of the pulley 3 and the shaft core 2 is a second welding point 21 located at the end of the shaft core 2 extending to the end cover 12, and the second welding point 21 is arranged around the outer peripheral wall of the shaft core 2.

[0032] In another embodiment, the pulley 3 is fixed on the shaft core 2 by bolts.

[0033] The present application provides a large-torque brushless outer rotor casing assembly. The welding method is used to fix the casing 1 and the shaft core 2, and the shaft core 2 and the pulley 3, thereby increasing the torsional force of 30 kgf and the thrust force of 50 kgf between the casing 1 and the shaft core in the prior art to more than 100 kgf, meeting the requirement of large torque, increasing the use field of the brushless outer rotor motor, such as sports equipment, and greatly improving the market share.

[0034] In addition, the waist-shaped hole 123 can provide good ventilation and heat dissipation for the motor. During operation of the motor, the internal structure of the motor can be clearly seen through the waist-shaped hole, thereby improving the visual comfort.

Claims

1. A large torque brushless external rotor housing assembly comprising a housing, a shaft core and a pulley, the shaft core is inserted into the housing, one end of the shaft core extends out of the housing, the pulley is sleeved on the shaft core extending outside the housing, characterized in that: The shell comprises an end cover, the end cover is provided with a plurality of waist-shaped holes, the shaft core is provided in a cylindrical shape, and the shaft core is fixed with the shell by welding. ​ 2. A large torque brushless external rotor motor housing assembly as defined in claim 1, wherein: The waist-shaped holes are arranged along the radial direction of the end cover, and the waist-shaped holes are arranged in an array along the circumferential direction of the end cover.

3. A large torque brushless external rotor motor housing assembly as defined in claim 2 wherein: The shell is an open-end cylindrical shell, the shell comprises a peripheral side shell and an end cover, the side shell is a two-end open cylindrical shell, the end cover is provided in a circular plate shape, and the end cover is fixed at one end of the side shell in the axial direction.

4. A large torque brushless external rotor motor housing assembly as defined in claim 3 wherein: The end cover is integrally formed with the side shell.

5. A large torque brushless external rotor motor housing assembly as defined in claim 4 wherein: The middle part of the end cover is concave to form a positioning part, a positioning hole is arranged at the middle position of the positioning part, and the positioning hole is used for positioning the axis.

6. A large torque brushless external rotor motor housing assembly as defined in claim 5 wherein: The positioning hole comprises a positioning wall at the middle position, the positioning wall is provided in a cylindrical shell shape, and the positioning wall is sleeved on the outer periphery of the shaft core.

7. A large torque brushless external rotor motor housing assembly as defined in claim 6 wherein: The fixed position of the positioning wall and the shaft core is a first welding point, the first welding point is arranged at the end of the positioning wall pointing outward and surrounds the periphery of the positioning wall.

8. A large torque brushless external rotor motor housing assembly as defined in claim 7, wherein: The pulley is sleeved on the outer periphery of the shaft core, the pulley and the shaft core are tightly matched by process, and the pulley and the shaft core are fixedly connected.

9. A large torque brushless external rotor motor housing assembly as defined in claim 8, wherein: The pulley and the shaft core are fixed by welding, the welding position of the pulley and the shaft core is a second welding point at the end of the end cover extending outward from the shaft core, and the second welding point surrounds the outer peripheral wall of the shaft core.

10. A large torque brushless external rotor motor housing assembly as defined in claim 8, wherein: The pulley is fixed on the shaft core by bolts.

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