Double-shell brushless motor structure

Abstract

The utility model relates to a double-shell brushless motor structure, which at least comprises an outer shell, an inner shell, a rear shell and a mounting flange, a rotor assembly and a motor stator are arranged in the inner shell; the outer shell sleeves the outer side of the inner shell, one end of the mounting flange is connected with a tool, and the other end of the mounting flange is connected with one end of the inner shell of the motor; the rear shell is fixed at the other end of the inner shell; one end of the mounting flange is provided with a convex outer positioning table, and the other end of the mounting flange is provided with an inner positioning table; the structural design is exquisite, the size is compact, a double-layer shell protection mechanism is adopted, and the durability and safety of the device are remarkably improved. The brushless motor shows many significant advantages, such as small space occupation, low heat productivity, low noise level and small vibration, and brings more convenient use experience and carrying mode for users. In addition, the structure is excellent in controllability and convenient and fast to install and maintain, and the use satisfaction degree of the user is further enhanced.

Description

Technical Field

[0001] The utility model belongs to a portable brushless electric tool, is applied to the field of brushless motors, and specifically relates to a double-shell brushless motor structure. Background Art

[0002] In the prior art, brushless motors usually adopt a single-shell design, equipped with both internal and external ventilation cooling systems. The ventilation design in the single shell makes the rotor cooling efficiency high. However, under high-load operation, the heat generated by the stator will gradually accumulate on the surface of the shell, and the temperature will increase significantly. If directly applied to small and compact power tools, the high temperature of the motor shell may cause the risk of skin burns.

[0003] In addition, single-shell motors have limitations in terms of air inlet filtration and air outlet protection. Large particles of foreign matter can easily enter the motor through the air inlet or outlet, causing damage to the motor during operation. Especially at high speeds, the vibration of the motor will be directly transmitted to the surface of the shell, which can easily cause resonance between the shell and the rotor, which may cause damage to the bearings and related transmission components due to mechanical fatigue.

[0004] On the other hand, although brushless motors with external ventilation designs exist, they are large in size and have low cooling efficiency, so they are not suitable for handheld tools that have high requirements for size and compactness.

[0005] The stator of a traditional brushless motor is usually directly and tightly installed in the motor housing. In a high-speed and high-temperature working environment, a gap may appear between the stator and the housing due to the principle of thermal expansion and contraction. As the motor runs longer, this gap will cause the noise to gradually increase, and eventually the stator may become loose, causing the motor to malfunction and be damaged.

[0006] It is worth noting that since bearings are installed at both ends of the single-shell motor, there is usually not enough space to install switches and bending limit devices for lead wires. Therefore, this type of motor often cannot be used alone and needs to be integrated with other auxiliary devices or systems for application. Utility Model Content

[0007] In view of the above situation, the utility model aims to solve the deficiencies of the existing related technologies. In particular, the utility model provides a double-shell brushless motor structure that can be used alone in a handheld power tool. The structure is compact in design and small in size. Through the protection of the double-layer shell, it achieves higher durability and safety. The brushless motor has significant advantages, such as small footprint, low heat generation, low noise level, and low vibration, thereby providing users with a more convenient use experience and carrying method. At the same time, the structure also has good controllability and installation and maintenance convenience, further improving the user's satisfaction.

[0008] In order to achieve the above-mentioned object, the utility model provides a double-shell brushless motor structure, which at least includes an outer shell, an inner shell, a rear shell and a mounting flange; wherein,

[0009] The inner housing is provided with a rotor assembly and a motor stator;

[0010] The outer shell is sleeved on the outside of the inner shell, one end of the mounting flange is connected to the tool, and the other end of the mounting flange is connected to one end of the inner shell of the motor; the rear shell is fixed to the other end of the inner shell;

[0011] One end of the mounting flange has a protruding outer positioning platform, and the other end of the mounting flange has an inner positioning platform; a positioning hole is provided in the middle of the mounting flange, and a plurality of screw holes are provided around the positioning hole;

[0012] The outer shell is provided with an air outlet, and a filter is installed on the air outlet; the rear shell is provided with a plurality of air inlets; the rear shell is also provided with a switch and a sheath for protecting a power line.

[0013] Furthermore, a circle of slots is provided on the outer positioning platform.

[0014] Furthermore, the rotor assembly at least includes a motor rotor, a motor shaft, a front bearing, a rear bearing and a fan; wherein

[0015] The front bearing is arranged at one end of the motor shaft, the rear bearing is arranged at the other end of the motor shaft, the motor rotor is arranged on the motor shaft, and the fan is arranged at the outside of the motor shaft.

[0016] Furthermore, a stator bracket is also provided inside the inner shell;

[0017] One end of the stator bracket has a plurality of outwardly extending positioning brackets, and the other end of the stator bracket has a plurality of inwardly concave positioning grooves;

[0018] A bearing mounting hole is arranged at the center of the stator bracket; and a plurality of motor wiring screws are arranged around the bearing mounting hole.

[0019] Furthermore, a positioning platform protruding outward and a bearing hole are provided in the middle of the inner housing of the motor, and a plurality of air outlets are opened on the outer circle of the motor housing.

[0020] Furthermore, a first mounting hole is also provided on the motor housing.

[0021] Furthermore, the rear shell is directly or indirectly provided with a fixing boss; a switch mounting hole for mounting a switch; a motor wire sheath mounting hole for protecting the wires; and an air inlet filter hole for filtering the air.

[0022] The utility model adopts the above technical solution and has the following significant beneficial effects:

[0023] The double-shell brushless motor structure provided by the utility model significantly improves the convenience of assembly with other tools by designing a unique detachable mounting flange.

[0024] The motor consists of an inner shell and an outer shell, in which the stator and rotor are carefully installed. To prevent the stator from loosening and rotating with the reaction force of the rotor, a stator anti-rotation bracket is specially equipped at one end of the stator. In addition, the outer shell not only enhances the overall structural stability of the motor, but also effectively reduces the vibration and resonance of the motor through the gap design between the flange and the rear shell, further improving the running stability of the motor.

[0025] It is worth mentioning that a filter is installed at the air outlet of the outer shell to effectively prevent large particles from entering the motor, thereby ensuring the safe operation of the motor. A switch is integrated on the rear shell to facilitate the user to control the start and stop operation of the motor. At the same time, the rear shell is also designed with a bending limit structure for the power cord, which effectively extends the service life of the power cord. For a motor used alone, this is undoubtedly a very practical protection measure.

[0026] In addition, three screws are set on the stator anti-rotation bracket to connect the motor wiring and the external power supply. This design is more convenient than the traditional brushless motor wiring method. Users do not need to go through complicated welding or directly lead the power line from the inside, but directly install the wiring screws on the stator anti-rotation bracket, which greatly simplifies the maintenance and disassembly process of the motor. At the same time, the protective design of the rear shell also ensures the safety of user operation.

[0027] In summary, the application of the dual-shell brushless motor of the utility model in handheld power tools can significantly increase service life, accelerate cooling speed, enhance structural strength, reduce vibration and noise levels, control temperature rise, and reduce space occupation. Therefore, the motor structure is particularly suitable for single use in handheld power tools with high volume requirements, showing a wide range of application prospects and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 This is a schematic diagram of the appearance structure of the motor of the utility model;

[0030] Figure 2 This is a schematic diagram of the internal structure of the motor of the utility model;

[0031] Figure 3 This is a schematic diagram of the rotor assembly structure of the motor of the utility model;

[0032] Figure 4 This is a schematic diagram of the mounting flange structure of the motor of the utility model;

[0033] Figure 5 This is a schematic diagram of the stator support structure inside the motor of the utility model;

[0034] Figure 6 This is a schematic diagram of the rear housing structure of the motor of the utility model;

[0035] Figure 7 This is a schematic diagram of the inner housing structure of the motor of the utility model;

[0036] Figure 8 It is a schematic diagram of the outer shell structure of the motor of the utility model.

[0037] In the figure: 1. outer shell; 2. inner shell; 3. rear shell; 4. mounting flange; 5. outer positioning platform; 6. inner positioning platform; 7. positioning hole; 8. screw hole; 9. filter; 10. switch; 11. sheath; 12. slot; 13. motor rotor; 14. motor shaft; 15. front bearing; 16. rear bearing; 17. fan; 18. stator bracket; 19. positioning bracket; 20. positioning slot; 21. bearing mounting hole; 22. motor wiring screw; 23. outwardly protruding positioning platform; 24. bearing hole; 25. air outlet; 26. first mounting hole; 27. motor stator; 28. fixing boss; 29. ​​switch mounting hole; 30. motor wire sheath mounting hole; 31. air inlet filter hole; 32. second mounting hole. DETAILED DESCRIPTION

[0038] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of devices and methods consistent with some aspects of the utility model as detailed in the attached claims.

[0039] See also Figures 1 to 8 As shown, this embodiment provides a double-shell brushless motor structure, which at least includes an outer shell 1, an inner shell 2, a rear shell 3 and a mounting flange 4; wherein,

[0040] like Figure 1 and Figure 2 As shown, the inner housing 2 is provided with a rotor assembly and a motor stator 27; the outer housing 1 is sleeved on the outside of the inner housing 2, one end of the mounting flange 4 is connected to a tool, and the other end of the mounting flange 4 is connected to one end of the inner housing 2 of the motor; the rear housing 3 is fixed to the other end of the inner housing 2;

[0041] like Figure 4 As shown, in this embodiment, one end of the mounting flange 4 has a protruding outer positioning platform 5, and the other end of the mounting flange 4 has an inner positioning platform 6; a positioning hole 7 is provided in the middle of the mounting flange 4, and a plurality of screw holes 8 are provided around the positioning hole 7; and a second mounting hole 26 is also provided on the mounting flange 4.

[0042] like Figure 7 As shown, the outer shell 1 is provided with an air outlet (not shown in the figure), and a filter 9 is installed on the air outlet; the rear shell 3 is provided with a plurality of air inlets (not shown in the figure); the rear shell 3 is also provided with a switch 10 and a sheath 11 for protecting the power cord.

[0043] like Figure 4 As shown, as an implementation manner, a circle of clamping grooves 12 is provided on the outer positioning platform 5 in this embodiment.

[0044] like Figure 2 and Figure 3 As shown, as an implementation mode, the rotor assembly in this embodiment at least includes a motor rotor 13, a motor shaft 14, a front bearing 15, a rear bearing 16 and a fan 17; wherein the front bearing 15 is arranged at one end of the motor shaft 14, the rear bearing 16 is arranged at the other end of the motor shaft 14, the motor rotor 13 is arranged on the motor shaft 14, and the fan 17 is arranged on the outside of the motor shaft 14.

[0045] like Figure 2 and Figure 5 As shown, as an implementation mode, a stator bracket 18 is further provided inside the inner shell 2 in this embodiment; one end of the stator bracket 18 has a plurality of outwardly extending positioning brackets 19, and the other end of the stator bracket 18 has a plurality of inwardly concave positioning grooves 20; a bearing mounting hole 21 is provided at the center of the stator bracket 18; and a plurality of motor wiring screws 22 are provided around the bearing mounting hole 21.

[0046] like Figure 1 and Figure 6 As shown, in this embodiment, the rear shell is also directly or indirectly provided with a fixing boss 28; a switch mounting hole 29 for mounting a switch; a motor wire sheath mounting hole 30 for protecting the wires, and an air inlet filter hole 31 for filtering the air.

[0047] like Figure 7 As shown, as an implementation mode, in this embodiment, a positioning platform 23 protruding outward and a bearing hole 24 are provided in the middle on the inner housing 2 of the motor, and a plurality of air outlets 25 are opened on the outer circle of the motor housing.

[0048] like Figure 8 As shown, as an implementation manner, a first mounting hole 26 is further provided on the motor housing 1 in this embodiment.

[0049] The utility model relates to a portable brushless electric tool, which is applied to the field of brushless motors and belongs to a double-shell brushless motor structure. Its inner shell plays a role in fixing the stator coil and rotor assembly of the motor. The outer shell is fixed to the outside of the inner shell of the motor through a mounting flange at one end of the inner shell of the motor and a rear shell of the motor, so as to play a comprehensive protective role for the brushless motor. The front end can play a role in fixing the motor. A switch is installed on the rear shell of the motor to start and stop the operation of the brushless motor. A motor wire sheath installed on the rear shell of the motor can protect the motor power line and is not easy to be disassembled, so as to effectively protect the reliability of the operation of the brushless motor. A filter is installed on the rear shell of the motor to effectively filter the wind entering the brushless motor without large particles of dust and foreign matter, so as to avoid affecting the normal operation of the motor. The outer shell of the motor can strengthen the strength of the motor and reduce the heat on the surface of the motor, so as to avoid the impact and deformation caused by sudden overload shutdown during high-speed operation. The brushless motor with a double shell can effectively protect the safe operation of the motor and effectively reduce the increase of the surface temperature of the motor, so as to effectively avoid burns when the user touches the surface of the motor in the handheld electric tool.

[0050] In the dual-shell brushless motor, the outer shell is tightly fixed to the outside of the inner shell of the motor through a removable flange and a rear shell. Its design is designed to enhance the structural stability of the motor and significantly reduce vibration. One end of the flange is connected to the tool, and the other end is tightly combined with the inner shell of the motor. This assembly structure is flexible to meet the installation requirements of various power tools and reducers. The outer shell is equipped with multiple air outlets and reserved space for installing filters to effectively prevent large particles from entering the motor, thereby protecting the internal fan from damage. The rear shell is firmly installed at the other end of the motor. There are multiple air inlets on the rear shell to ensure that the airflow entering the motor will not cause damage to the motor rotor, thereby extending the service life of the motor. A switch device is provided on the rear shell to facilitate the user to start and stop the motor. In addition, the rear shell is also equipped with a rubber sheath to protect the motor power cord and prevent it from breaking during use, ensuring stable and reliable operation of the motor.

[0051] The stator bracket is provided with a plurality of raised columns, which precisely correspond to the grooves on the outer diameter of the stator, and not only play a positioning role during the assembly process, but also effectively prevent the stator from rotating when the motor is running. A bearing is installed in the center of the stator bracket to support and fix the rotor. In addition, the stator bracket is also designed with a plurality of screw holes for convenient connection of the motor power cord. The content of the present invention not only improves the performance of the power tool, but also simplifies the overall structure, significantly reduces the size of the handheld power tool, is easy for users to carry, and is safe and reliable in operation.

[0052] The installation process of the motor is as follows: First, the mounting flange is accurately fixed according to the positioning boss on the motor inner housing, and then screws are passed through the screw holes on the mounting flange to achieve a fastening connection with the motor inner housing. Next, the motor outer housing is securely installed on the outside of the motor inner housing through the inner positioning platform on the mounting flange. In addition, a filter is also installed on the motor outer housing, and its other end is connected to the rear housing. Screws are also used during the connection process to fasten it to the rear housing through the screw holes on the housing.

[0053] A switch and a motor wire protection cover are installed on the rear housing of the motor to ensure convenient and safe operation. The motor stator bracket is firmly connected to the motor stator bracket through the positioning bracket and is installed as a whole in the inner housing of the motor. In addition, the front bearing, fan, motor rotor and rear bearing are installed on the motor shaft in sequence, and these components together constitute the motor rotor assembly.

[0054] During the assembly process, the bearing at one end of the rotor assembly is precisely fixed in the bearing hole of the motor inner housing, while the bearing at the other end is fixed in the bearing hole in the stator bracket. Through such a delicate installation process, a complete motor structure is finally assembled.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A double-shell brushless motor structure, characterized in that: It at least includes an outer shell, an inner shell, a rear shell and a mounting flange; wherein, The inner housing is provided with a rotor assembly and a motor stator; The outer shell is sleeved on the outside of the inner shell, one end of the mounting flange is connected to the tool, and the other end of the mounting flange is connected to one end of the inner shell of the motor; the rear shell is fixed to the other end of the inner shell; One end of the mounting flange has a protruding outer positioning platform, and the other end of the mounting flange has an inner positioning platform; a positioning hole is provided in the middle of the mounting flange, and a plurality of screw holes are provided around the positioning hole; The outer shell is provided with an air outlet, and a filter is installed on the air outlet; the rear shell is provided with a plurality of air inlets; the rear shell is also provided with a switch and a sheath for protecting a power line.

2. The double-shell brushless motor structure according to claim 1, characterized in that: The outer positioning platform is provided with a circle of slots.

3. The double-shell brushless motor structure according to claim 1, characterized in that: The rotor assembly at least includes a motor rotor, a motor shaft, a front bearing, a rear bearing and a fan; wherein The front bearing is arranged at one end of the motor shaft, the rear bearing is arranged at the other end of the motor shaft, the motor rotor is arranged on the motor shaft, and the fan is arranged at the outside of the motor shaft.

4. The double-shell brushless motor structure according to claim 3, characterized in that: A stator bracket is also provided inside the inner shell; One end of the stator bracket has a plurality of outwardly extending positioning brackets, and the other end of the stator bracket has a plurality of inwardly concave positioning grooves; A bearing mounting hole is arranged at the center of the stator bracket; and a plurality of motor wiring screws are arranged around the bearing mounting hole.

5. The double-shell brushless motor structure according to any one of claims 1 to 4, characterized in that: The inner shell of the motor is provided with a positioning platform protruding outwards and a bearing hole in the middle, and the outer circle of the motor shell is provided with a plurality of air outlets.

6. The double-shell brushless motor structure according to claim 5, characterized in that: The motor outer shell is also provided with a first mounting hole.

7. The double-shell brushless motor structure according to any one of claims 1 to 4, characterized in that: The rear housing is also directly or indirectly provided with a fixing boss; A switch mounting hole for mounting a switch is also provided; Motor wire guard mounting holes to protect wires, and Air inlet filter holes for filtering air.

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