A safe motor that is easy to maintain inside

Abstract

The present invention discloses a safe motor that is easy to maintain inside, and relates to the technical field of motors. The present invention includes a frame, an inner wall of the frame is fixedly mounted with a shell through a group of connecting parts, a main engine component is mounted at the axial position of the shell, a transmission shaft is mounted at the axial position of the main engine component, the peripheral side of the transmission shaft is rotatably connected to the shell through a connecting bearing, a quick lock component that cooperates with the shell is mounted at the tail of the main engine component, a water-cooling ring cavity is fixedly opened inside the shell, a drainage swivel driven by the transmission shaft is rotatably connected to the inner wall of the water-cooling ring cavity, a spiral drainage sheet is fixedly mounted on the surface of the drainage swivel, and the peripheral side of the spiral drainage sheet is rotatably fitted with the water-cooling ring cavity. The present invention adds a quick-release structure of motor components on the basis of traditional motors through the structural setting of the motor. When working, an external operator only needs to rotate the pin lock ring to achieve rapid separation of the components inside the motor from the shell.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a safe motor which is convenient for internal maintenance. Background Art

[0002] A motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. It is represented by the letter M in the circuit. Its main function is to generate driving torque as a power source for electrical appliances or various machines.

[0003] When the existing motor is in use, because the motor itself does not have the function of easy disassembly, once the motor is damaged, it will lead to an increase in maintenance time, thereby reducing the working efficiency of the device. In order to solve the problems raised in the above background technology, the patent document with publication number CN215772750U discloses a motor that is easy to maintain. The motor utilizes the mutual cooperation between the mounting frame, the first connecting groove, the second connecting groove, the connecting block, the connecting rod and the connecting through hole to facilitate the maintenance of the motor, avoiding the problem that because the motor itself does not have the function of easy disassembly, once the motor is damaged, it will lead to an increase in maintenance time, thereby reducing the working efficiency of the device. However, the quick-release structure of the motor in the above device is not easy to operate, which leads to a low maintenance efficiency of the motor. In addition, the heat dissipation method of the existing motor heat dissipation device is relatively single, and the heat dissipation area cannot be effectively improved. Therefore, the temperature safety of the motor during operation is difficult to ensure. Based on this, the present invention provides a safe motor that is easy to maintain internally to solve the problems raised in the above background technology. Summary of the invention

[0004] The purpose of the present invention is to provide a safe motor which is easy to maintain inside. By setting a quick lock component, an air cooling component and a water cooling component, the problems of the existing motor housing quick release structure being inconvenient to operate and having low disassembly efficiency and the difficulty in ensuring temperature safety during motor heat dissipation are solved.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0006] The present invention is a safe motor that is easy to maintain inside, comprising a frame, an outer shell fixedly installed on the inner wall of the frame through a group of connecting parts, a main engine component installed at the axial position of the outer shell, a transmission shaft installed at the axial position of the main engine component, the peripheral side of the transmission shaft is rotatably connected to the outer shell through a connecting bearing, a quick lock component matched with the outer shell is installed at the tail of the main engine component, a water-cooling ring cavity is fixedly opened inside the outer shell, a drainage swivel driven by the transmission shaft is rotatably connected to the inner wall of the water-cooling ring cavity, a spiral drainage sheet is fixedly installed on the surface of the drainage swivel, the peripheral side of the spiral drainage sheet is rotatably fitted with the water-cooling ring cavity, a water-cooling component linked to the transmission shaft is fixedly installed on the surface of the water-cooling ring cavity, and air-cooling components linked to the transmission shaft are installed on both side surfaces of the frame.

[0007] Preferably, the main engine assembly includes a stator mounted on the inner wall of the housing and a rotor arranged inside the stator, and the circumferential side surface of the transmission shaft is fixedly connected to the rotor.

[0008] Preferably, the quick lock assembly includes a lock plate rotatably connected to the tail of the rotor, the circumferential side of the lock plate is slidably connected to the shell, the tail of the lock plate is fixedly connected to a threaded sleeve, the circumferential side of the threaded sleeve is threadedly connected to a pin lock ring, the circumferential side of the pin lock ring is rotatably connected to a transmission ring, the inside of the lock plate is slidably connected to a group of slides distributed in a circular array, the top of each slide is fixedly mounted with a pin rod, a connecting rod is hinged between the relative surfaces of each slide and the transmission ring, and a pin hole is fixedly opened on the inner wall of the shell corresponding to the position of each pin rod, and the axis of the pin hole is perpendicular to the axis of the shell.

[0009] Preferably, the inner wall of the shell is provided with a group of positioning guide grooves distributed in a circular array, and a guide block that slides with the positioning guide groove is fixedly installed on the circumferential side surface of the lock plate and corresponds to the position of each positioning guide groove, the tail of the pin lock ring is fixedly connected with a tail cover, and a group of sealing convex rings are fixedly installed on the tail cover relative to a surface of the shell, and a sealing ring groove is provided at the tail of the shell and corresponds to the position of each sealing convex ring.

[0010] Preferably, an output shaft is fixedly installed on the end of the transmission shaft, a differential shaft a is rotatably connected to the inner wall of the frame, a driving sprocket is fixedly installed on the circumferential side of the output shaft, a differential gear meshing with the driving sprocket is fixedly installed on the circumferential side of the differential shaft a, a driven gear ring meshing with the differential gear is fixedly installed on the inner wall of the drainage swivel ring, and the radius of the driven gear ring is 2 to 3 times the radius of the differential gear.

[0011] Preferably, the water cooling assembly comprises a water cooling inlet pipe installed on the upper part of the shell and connected with the water cooling ring cavity, a heat exchange exhaust pipe installed on the lower part of the shell and connected with the water cooling ring cavity, and a pump shell fixedly connected to the frame, the water cooling inlet pipe is internally threadedly connected with a filter element, one end of the water inlet of the water cooling inlet pipe and one end of the water outlet of the heat exchange exhaust pipe are fixedly connected to the pump shell through a heat dissipation coil, the surface of the heat dissipation coil is fixedly connected to the frame, the inner wall of the pump shell is rotatably connected with a pump shaft, a group of pump blades distributed in a circular array are fixedly installed on the circumferential side surface of the pump shaft, a pump gear is fixedly installed on the circumferential side surface of the pump shaft, the inner wall of the frame is rotatably connected with a coupling, the circumferential side surface of the coupling are respectively fixedly installed with an internal gear meshing with a driving gear disc and an external gear meshing with the pump gear, the radius of the driving gear disc is 0.9 times the radius of the transmission shaft.

[0012] Preferably, the heat dissipation coil is a continuous U-shaped structure, two heat dissipation coils are respectively arranged on both sides of the shell, and the heat dissipation coil is made of copper.

[0013] Preferably, the air cooling components respectively include a differential shaft b rotatably connected to the inside of the frame and a group of ventilation pipes regularly distributed and fixedly connected to the frame, the inner wall of the ventilation pipe is fixedly installed with a bracket, the inner wall of the bracket is rotatably connected with a rotating shaft, the circumferential side surface of the rotating shaft is fixedly installed with a group of heat dissipation blades distributed in a circular array, the tail end of the rotating shaft is fixedly installed with a driven bevel gear, the circumferential side surface of the differential shaft b and the position corresponding to each driven bevel gear are installed with an active bevel gear meshing with the driven bevel gear, and the circumferential side surface of the differential shaft b is transmission connected to the differential shaft a through a chain.

[0014] Preferably, the axis of the ventilation pipe is perpendicular to the axis of the transmission shaft, the axes of the differential shaft b and the coupling shaft are parallel to the axis of the transmission shaft, and the heat dissipation coil is arranged on the inner side of the heat dissipation blades.

[0015] The present invention has the following beneficial effects:

[0016] 1. The present invention adds a quick-release structure for motor components on the basis of traditional motors through the structural setting of the motor. When working, an external operator only needs to rotate the pin lock ring to quickly separate the components inside the motor from the outer shell. By achieving the above-mentioned quick separation effect, it is convenient to quickly maintain the components inside the motor.

[0017] 2. The present invention integrates water cooling and air cooling functions when the motor is working by setting a water cooling component and an air cooling component. By realizing the above-mentioned integrated heat dissipation function, the heat dissipation efficiency of the device is effectively guaranteed. Moreover, by setting the heat dissipation coil, the heat dissipation surface area of ​​the motor when working can be effectively improved. By increasing the heat dissipation surface area, the heat dissipation effect of the motor when working can be effectively guaranteed. By ensuring the above-mentioned heat dissipation effect, the safety of the motor when working can be effectively improved.

[0018] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 A schematic diagram of the structure of a safe motor that is easy to maintain inside;

[0021] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of;

[0022] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0023] Figure 4 for Figure 2 A schematic diagram of the local enlarged structure at B in the middle;

[0024] Figure 5 for Figure 2 A schematic diagram of the local enlarged structure at C in the middle;

[0025] Figure 6 It is a structural schematic diagram of the differential gear and the heat dissipation coil;

[0026] Figure 7 It is a schematic diagram of the structure of the rotor and the transmission shaft;

[0027] Figure 8 Schematic diagram of the structure of the pump casing and external gear.

[0028] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0029] 1. Frame; 2. Casing; 3. Drive shaft; 4. Water-cooled ring cavity; 5. Drainage swirl ring; 6. Spiral drainage plate; 7. Stator; 8. Rotor; 9. Lock plate; 10. Threaded sleeve; 11. Pin lock ring; 12. Drive ring; 13. Slide seat; 14. Pin rod; 15. Connecting rod; 16. Tail cover; 17. Sealing convex ring; 18. Differential shaft a; 19. Driving gear plate; 20. Differential gear; 21. Driven gear ring; 22. Water-cooled inlet pipe; 23. Heat exchange exhaust pipe; 24. Pump housing; 25. Filter element; 26. Heat dissipation coil; 27. Pump gear; 28. Pump shaft; 29. ​​External gear; 30. Heat dissipation fan blade; 31. Ventilation pipe; 32. Rotating shaft; 33. Differential shaft b. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-8 The present invention is a safe motor that is easy to maintain inside, comprising a frame 1, a housing 2 is fixedly mounted on the inner wall of the frame 1 through a group of connecting bolts, a group of heat dissipation grooves distributed in a circumferential array are opened on the outer circumference of the housing 2, a main engine component is mounted on the axial position of the housing 2, a transmission shaft 3 is mounted on the axial position of the main engine component, and the peripheral side surface of the transmission shaft 3 is rotatably connected to the housing 2 through a connecting bearing;

[0032] The main engine assembly includes a stator 7 mounted on the inner wall of the housing 2 and a rotor 8 disposed inside the stator 7, and the peripheral side surface of the transmission shaft 3 is fixedly connected to the rotor 8;

[0033] A quick lock assembly that matches the housing 2 is installed at the rear of the host assembly;

[0034] The quick lock assembly includes a lock plate 9 rotatably connected to the tail of the rotor 8, the peripheral side of the lock plate 9 is slidably connected to the housing 2, the inner wall of the housing 2 is provided with a group of positioning guide grooves distributed in a circumferential array, and the peripheral side of the lock plate 9 and the position corresponding to each positioning guide groove are fixedly installed with a guide block that slides with the positioning guide groove;

[0035] The tail of the lock plate 9 is fixedly connected with a threaded sleeve 10, and the peripheral side of the threaded sleeve 10 is threadedly connected with a pin lock ring 11;

[0036] The tail of the pin lock ring 11 is fixedly connected with a tail cover 16, and a group of sealing convex rings 17 are fixedly installed on the tail cover 16 on a surface opposite to the housing 2. A sealing ring groove is provided at the tail of the housing 2 and at the position corresponding to each sealing convex ring 17. The sealing convex ring 17 and the sealing ring groove are arranged to effectively ensure the sealing performance of the connection between the sealing convex ring 17 and the sealing ring groove.

[0037] The inner wall of the pin lock ring 11 is fixedly provided with a threaded portion, and the outer surface of the threaded sleeve 10 is fixedly provided with a threaded groove matching the threaded portion;

[0038] The peripheral side surface of the pin lock ring 11 is rotatably connected to the transmission ring 12, and the interior of the lock plate 9 is slidably connected to a group of slide seats 13 distributed in a circumferential array, and a pin rod 14 is fixedly installed on the top of each slide seat 13, and the axis of the pin rod 14 is parallel to the axis of the transmission shaft 3. A connecting rod 15 is hinged between the opposite surfaces of each slide seat 13 and the transmission ring 12, and a pin hole is fixedly opened on the inner wall of the housing 2 and corresponding to the position of each pin rod 14, and the axis of the pin hole is perpendicular to the axis of the housing 2;

[0039] By setting the positioning guide groove and the guide block, it is ensured that after the lock plate 9 is installed, each pin rod 14 can correspond to the pin hole at the corresponding position;

[0040] A water-cooling annular cavity 4 is fixedly provided inside the housing 2, and a drainage rotating ring 5 driven by a transmission shaft 3 is rotatably connected to the inner wall of the water-cooling annular cavity 4;

[0041] An output shaft is fixedly installed at the end of the transmission shaft 3, a differential shaft a18 is rotatably connected to the inner wall of the frame 1, a driving toothed disc 19 is fixedly installed on the peripheral side of the output shaft, a differential gear 20 meshing with the driving toothed disc 19 is fixedly installed on the peripheral side of the differential shaft a18, and a driven gear ring 21 meshing with the differential gear 20 is fixedly installed on the inner wall of the drainage swivel ring 5, and the radius of the driven gear ring 21 is twice the radius of the differential gear 20;

[0042] By setting the radius difference between the driven ring gear 21 and the differential gear 20, the driven ring gear 21 can be differentially driven by the output shaft;

[0043] A spiral drainage sheet 6 is fixedly mounted on the surface of the drainage swirl ring 5. The peripheral side of the spiral drainage sheet 6 is rotationally fitted with the water-cooling ring cavity 4. The spiral drainage sheet 6 is made of engineering plastic.

[0044] A water cooling component linked to the transmission shaft 3 is fixedly installed on the surface of the water cooling ring cavity 4 , and air cooling components linked to the transmission shaft 3 are installed on both side surfaces of the frame 1 .

[0045] The water cooling assembly includes a water cooling inlet pipe 22 installed on the upper part of the housing 2 and communicating with the water cooling annular cavity 4, a heat exchanger exhaust pipe 23 installed on the lower part of the housing 2 and communicating with the water cooling annular cavity 4, and a pump housing 24 fixedly connected to the frame 1. The inner thread of the water cooling inlet pipe 22 is connected with a filter element 25, and the filter element 25 is used to filter and intercept impurities in the exchange water. The filter element 25 is connected to the water cooling inlet pipe 22 through a threaded connection, so that the filter element 25 can be quickly replaced;

[0046] One end of the water inlet of the water-cooling inlet pipe 22 and one end of the water outlet of the heat exchange exhaust pipe 23 are fixedly connected to the pump housing 24 through the heat dissipation coil 26. The heat dissipation coil 26 is a continuous U-shaped structure. The two heat dissipation coils 26 are respectively arranged on both sides of the housing 2. The heat dissipation coils 26 are made of copper;

[0047] The copper material setting of the heat dissipation coil 26 and the continuous U-shaped structure setting of the heat dissipation coil 26 effectively ensure the heat dissipation surface area and heat dissipation efficiency of the heat dissipation coil 26;

[0048] The surface of the heat dissipation coil 26 is fixedly connected to the frame 1, the inner wall of the pump housing 24 is rotatably connected to the pump shaft 28, a group of pump blades distributed in a circular array are fixedly installed on the circumferential side of the pump shaft 28, a pump gear 27 is fixedly installed on the circumferential side of the pump shaft 28, the inner wall of the frame 1 is rotatably connected to the coupling, the circumferential side of the coupling are respectively fixedly installed with an internal gear meshing with the driving gear plate 19 and an external gear 29 meshing with the pump gear 27, the radius of the driving gear plate 19 is 0.9 times the radius of the transmission shaft 3.

[0049] The air cooling assembly includes a differential shaft b33 rotatably connected to the inside of the frame 1 and a group of ventilation pipes 31 regularly distributed and fixedly connected to the frame 1. The axes of the differential shaft b33 and the coupling are parallel to the axis of the transmission shaft 3. The ventilation pipe 31 is a hollow tubular structure with openings at both ends. The axis of the ventilation pipe 31 is perpendicular to the axis of the transmission shaft 3.

[0050] A bracket is fixedly installed on the inner wall of the ventilation pipe 31, and a rotating shaft 32 is rotatably connected to the inner wall of the bracket. A group of heat dissipation blades 30 distributed in a circular array are fixedly installed on the circumferential side of the rotating shaft 32. The heat dissipation coil 26 is arranged on the inner side of the heat dissipation blades 30. A driven bevel gear is fixedly installed on the tail end of the rotating shaft 32. A driving bevel gear meshing with the driven bevel gear is installed on the circumferential side of the differential shaft B33 and at the position corresponding to each driven bevel gear. The circumferential side of the differential shaft B33 is transmission-connected to the differential shaft A18 through a chain.

[0051] When in use, the shell 2 and the stator 7 are assembled as one, and the stator 7 and the transmission shaft 3 are installed in the interior of the shell 2 through a quick lock assembly. After assembly, each pin rod 14 is respectively inserted into each pin hole at the corresponding position, and then the shell 2 is assembled with the stator 7 and the tail cover 16. When the transmission shaft 3 outputs a speed, on the one hand, it drives the heat dissipation fan blades 30 to perform air cooling and heat dissipation of the shell 2, and on the other hand, it drives the drainage swirl ring 5 and the pump shaft 28 to rotate. After the drainage swirl ring 5 rotates, it controls the flow rate of the water-cooling liquid in the water-cooling ring cavity 4. This motor is a unidirectional motor. When the transmission shaft 3 outputs a speed, under the action of the spiral drainage plate 6, the water-cooling liquid is transported from the water-cooling inlet pipe 22 to one side of the heat exchange exhaust pipe 23. After the pump shaft 28 rotates, it drives the pump blades to rotate. After the pump blades rotate, they provide flow power to the water-cooling liquid. When the water-cooling liquid flows through the heat dissipation coil 26, it is acted on by the heat dissipation fan blades 30 to achieve the heat dissipation purpose.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A safe motor that is easy to maintain inside, comprising a frame (1), characterized in that: The inner wall of the frame (1) is fixedly mounted with a housing (2) via a group of connecting parts; a main engine assembly is mounted at the axial position of the housing (2); a transmission shaft (3) is mounted at the axial position of the main engine assembly; the peripheral side surface of the transmission shaft (3) is rotatably connected to the housing (2) via a connecting bearing; a quick lock assembly that cooperates with the housing (2) is mounted at the rear of the main engine assembly; a water-cooling annular cavity (4) is fixedly provided inside the housing (2); a drainage swivel (5) driven by the transmission shaft (3) is rotatably connected to the inner wall of the water-cooling annular cavity (4); The surface of the drainage swirl ring (5) is fixedly mounted with a spiral drainage plate (6), the peripheral side surface of the spiral drainage plate (6) is rotationally fitted with the water-cooling ring cavity (4), the surface of the water-cooling ring cavity (4) is fixedly mounted with a water-cooling component linked to the transmission shaft (3), both sides of the frame (1) are mounted with an air-cooling component linked to the transmission shaft (3), the quick-locking component comprises a locking plate (9) rotatably connected to the tail of the rotor (8), the peripheral side surface of the locking plate (9) is slidably connected to the housing (2), and the tail of the locking plate (9) is fixedly connected with a threaded sleeve (1) 0), the circumferential side surface of the threaded sleeve (10) is threadedly connected to a pin lock ring (11), the circumferential side surface of the pin lock ring (11) is rotatably connected to a transmission ring (12), the interior of the lock plate (9) is slidably connected to a group of slide seats (13) distributed in a circumferential array, the top of each slide seat (13) is fixedly mounted with a pin rod (14), a connecting rod (15) is hinged between the opposing surfaces of each slide seat (13) and the transmission ring (12), and the inner wall of the housing (2) is fixedly provided with a pin hole corresponding to the position of each pin rod (14), The axis of the pin hole is perpendicular to the axis of the housing (2); a group of positioning guide grooves distributed in a circumferential array are provided on the inner wall of the housing (2); a guide block slidably matched with the positioning guide groove is fixedly installed on the peripheral side surface of the lock plate (9) and at a position corresponding to each positioning guide groove; a tail cover (16) is fixedly connected to the tail of the pin lock ring (11); a group of sealing convex rings (17) are fixedly installed on a surface of the tail cover (16) relative to the housing (2); and a sealing ring groove is provided at the tail of the housing (2) and at a position corresponding to each sealing convex ring (17).

2. A safe motor that is easy to maintain inside according to claim 1, characterized in that: The main engine assembly comprises a stator (7) mounted on the inner wall of the housing (2) and a rotor (8) arranged on the inner side of the stator (7), and the circumferential side surface of the transmission shaft (3) is fixedly connected to the rotor (8).

3. A safe motor that is easy to maintain inside according to claim 1, characterized in that: An output shaft is fixedly mounted on the end of the transmission shaft (3); a differential shaft a (18) is rotatably connected to the inner wall of the frame (1); a driving toothed disc (19) is fixedly mounted on the peripheral side of the output shaft; a differential gear (20) meshing with the driving toothed disc (19) is fixedly mounted on the peripheral side of the differential shaft a (18); a driven gear ring (21) meshing with the differential gear (20) is fixedly mounted on the inner wall of the drainage swivel ring (5); and a radius of the driven gear ring (21) is 2 to 3 times the radius of the differential gear (20).

4. A safe motor that is easy to maintain inside according to claim 3, characterized in that: The water cooling assembly comprises a water cooling inlet pipe (22) mounted on the upper part of the housing (2) and connected to the water cooling annular cavity (4), a heat exchange exhaust pipe (23) mounted on the lower part of the housing (2) and connected to the water cooling annular cavity (4), and a pump housing (24) fixedly connected to the frame (1); a filter element (25) is connected to the inner thread of the water cooling inlet pipe (22); one end of the water inlet of the water cooling inlet pipe (22) and one end of the water outlet of the heat exchange exhaust pipe (23) are fixedly connected to the pump housing (24) via a heat dissipation coil (26); the surface of the heat dissipation coil (26) is connected to the pump housing (24); The frame (1) is fixedly connected, the inner wall of the pump housing (24) is rotatably connected to a pump shaft (28), a group of pump blades distributed in a circumferential array are fixedly mounted on the circumferential side surface of the pump shaft (28), a pump gear (27) is fixedly mounted on the circumferential side surface of the pump shaft (28), the inner wall of the frame (1) is rotatably connected to a coupling, an inner gear meshing with a driving gear plate (19) and an outer gear (29) meshing with the pump gear (27) are respectively fixedly mounted on the circumferential side surface of the coupling, and the radius of the driving gear plate (19) is 0.9 times the radius of the transmission shaft (3).

5. A safe motor that is easy to maintain inside according to claim 4, characterized in that: The heat dissipation coil (26) is a continuous U-shaped structure, and two heat dissipation coils (26) are respectively arranged on two sides of the outer shell (2), and the heat dissipation coil (26) is made of copper.

6. A safe motor that is easy to maintain inside according to claim 5, characterized in that: The air cooling assembly comprises a differential shaft b (33) rotatably connected to the inside of the frame (1) and a group of regularly distributed ventilation pipes (31) fixedly connected to the frame (1); a bracket is fixedly mounted on the inner wall of the ventilation pipe (31); a rotating shaft (32) is rotatably connected to the inner wall of the bracket; a group of heat dissipation blades (30) distributed in a circumferential array are fixedly mounted on the circumferential side surface of the rotating shaft (32); a driven bevel gear is fixedly mounted on the tail end of the rotating shaft (32); a driving bevel gear meshing with the driven bevel gear is mounted on the circumferential side surface of the differential shaft b (33) and at the position corresponding to each driven bevel gear; and the circumferential side surface of the differential shaft b (33) is transmission-connected to the differential shaft a (18) via a chain.

7. A safe motor that is easy to maintain inside according to claim 6, characterized in that: The axis of the ventilation pipe (31) is perpendicular to the axis of the transmission shaft (3), the axes of the differential shaft b (33) and the coupling shaft are parallel to the axis of the transmission shaft (3), and the heat dissipation coil (26) is arranged on the inner side of the heat dissipation fan blade (30).

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