Outer rotor type motor and electric tool using the same

Abstract

To provide an outer rotor type motor and an electric tool to which the motor is applied. [Solution] An outer rotor type motor 100 includes a frame 10, a stator module 20, a rotating shaft 30, a support member 40, and a rotor module 50. The frame has a side stand 11, a hollow tube 13, and a hollow cylinder 15. The side stand is connected to the hollow tube. The hollow tube has a passage 131. An open space 17 is formed between the side stand and the hollow tube, which is connected to the passage. The stator module is connected to the hollow tube and placed in the open space to rotate the rotor module. The rotating shaft is inserted into the passage, both ends of which protrude into the hollow tube, and one of the both ends is exposed to the outside of the hollow cylinder. The support member is connected to the rotating shaft and placed in the passage. The rotor module is inserted into the open space and has a side cap 51. The side cap is connected to the rotating shaft and exposed to the outside of the open space.

Description

[Technical field]

[0001] This invention relates to a motor for an electric tool, and more particularly to an outer rotor type motor and an electric tool to which the motor is applied. [Background technology]

[0002] The outer rotor type motor and the electric tool disclosed in Patent Document 1 improve the heat dissipation effect by using blades formed on the annular wall surface of the housing of the outer rotor. Since there are gaps or slits between the blades, foreign matter or dust often enters through the gaps or slits and accumulates on the surface of the magnet, affecting the rotational motion of the motor.

[0003] In the pulse-type power tool transmission and trigger-type stopping device disclosed in Patent Document 2, the driving mechanism is an outer rotor type motor. The rotor of the outer rotor type motor is exposed to the outside and is relatively long, so it is fixed inside the housing of the power tool. However, Patent Document 2 suppresses the outer rotor type motor from generating strong vibrations by supporting the second extension part of the outer rotor with a bearing, which not only makes the assembly process difficult but also increases costs. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] China Patent Publication No. 116094276A [Patent Document 2] Taiwan Patent No. I781070 Summary of the Invention [Problem to be solved by the invention]

[0005] The main object of the present invention is to provide an outer rotor type motor that is easy to install on an electric tool and can be easily connected to the head of the electric tool.

[0006] Another object of the present invention is to provide an electric tool that uses the above-mentioned outer rotor type motor. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the outer rotor type motor includes a frame, a stator module, a rotating shaft, a support member, and a rotor module. The frame has a side stand, a hollow tube, and a hollow cylinder. The side stand is connected to the hollow tube. The hollow tube has a passage. The hollow cylinder is connected to the side stand to form an open space between the side stand and the hollow tube. The open space is connected to the passage. The stator module is connected to the hollow tube and placed in the open space. The rotating shaft is inserted into the passage, both ends protrude into the hollow tube, and one of the both ends is exposed to the outside of the hollow cylinder. The support member is connected to the rotating shaft and placed in the passage. The rotor module is inserted into the open space and has a side cap. The side cap is connected to the rotating shaft and exposed to the outside of the open space. The stator module faces the frame to drive and rotate the rotor module. The hollow cylinder has a number of connecting parts.

[0008] In detail, the outer rotor motor of the present invention is connected to the outside by the connection part of the hollow cylinder of the frame, which simplifies the assembly work of the outer rotor motor. The hollow cylinder not only increases the heat dissipation area, but also prevents foreign objects from entering the rotor module, thereby improving the reliability of the outer rotor motor.

[0009] In order to achieve the above object, the power tool includes a housing, a tool head, a fan, and the outer rotor type motor. The housing has a plurality of positioning portions. The tool head and the fan are mounted in the housing. The outer rotor type motor is mounted in the housing and between the tool head and the fan. The connecting portion of the hollow cylinder is coupled with the positioning portions. The tool head is connected to the rotor module.

[0010] The above-mentioned structural features allow the outer rotor motor and the positioning portion of the housing to be fitted together, which not only simplifies the assembly work and reduces the number of parts used, but also improves the efficiency of the assembly work.

[0011] The detailed structure, features, assembly or usage of the external rotor motor and the power tool applied thereto according to the present invention will be clarified through the detailed description of the following embodiment. In addition, those with common sense in the field of the present invention should understand that the following detailed description and the embodiment presented by the present invention are merely examples for explaining the present invention and cannot limit the scope of the claims of the present invention. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view of an outer rotor motor in accordance with an embodiment of the present invention; FIG. [Diagram 2] FIG. 2 is a perspective view of an outer rotor motor according to an embodiment of the present invention viewed from another angle. [Diagram 3] FIG. 3 is an exploded perspective view of an outer rotor motor according to an embodiment of the present invention, taken from the same angle as FIG. 2. [Figure 4] 4 is a cross-sectional view showing a connector passing through the hollow cylinder of FIG. 3. [Diagram 5] 2 is a cross-sectional view showing a connection portion passing through the hollow cylinder of FIG. 1. [Figure 6] 2 is an exploded perspective view of a connecting holder of a rotary module of an outer rotor motor in accordance with an embodiment of the present invention; FIG. [Figure 7] FIG. 7 is a perspective view of an outer rotor type motor according to an embodiment of the present invention, viewed from the same angle as FIG. 6. [Figure 8] 1 is a side cross-sectional view of a power tool using an outer rotor type motor according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] (One embodiment) As shown in FIGS. 1 to 3 , an outer rotor type motor 100 according to an embodiment of the present invention includes a frame 10 , a stator module 20 , a rotating shaft 30 , a support member 40 and a rotor module 50 .

[0014] The frame 10 has a side stand 11, a hollow tube body 13, and a hollow cylinder body 15. The side stand 11 is connected to the hollow tube body 13. The hollow tube body 13 has a passage 131. The hollow cylinder body 15 is connected to the side stand 11, so that an open space 17 is formed between the side stand 11 and the hollow tube body 13. In this embodiment, the side stand 11 is disposed at one end of the hollow cylinder body 15, but is not limited to this. In another embodiment, the side stand 11 may be disposed inside the hollow cylinder body 15.

[0015] The side stand 11 has a number of heat dissipation ports 111 that are connected to the open space 17. The hollow cylinder 15 has a number of grooves 151 and four connecting parts 153. The grooves 151 are formed on the outside 157 of the hollow cylinder 15 and extend from the free end 155 of the hollow cylinder 15 to the side stand 11 to increase the heat transfer area. The free end 155 and the side stand 11 are located at opposite ends of the hollow cylinder 15. The entire inner wall surface 159 of the hollow cylinder 15 is an arc surface. In other words, the present invention does not have any openings on the inner wall surface 159 of the hollow cylinder 15, and limits the range of the open space 17, thereby preventing external dust or foreign objects from entering from the outside 157.

[0016] In this embodiment, the frame 10 is integrally molded from a metal such as aluminum or an aluminum alloy, so that the heat conduction effect and structural strength are relatively good. The concave groove 151 is connected to the heat dissipation port 111. The four connecting parts 153 are arranged in pairs and are symmetrically positioned. As shown in FIG. 1, the two sets of connecting parts 153 are arranged back to back. The connecting parts 153, i.e., the concave parts, are recessed into the outer side 157 of the hollow cylinder 15 and are connected to the adjacent concave grooves 151. In another embodiment, the connecting parts 153 may have different structures, such as protrusions or structures with the functions of fixing and positioning. The number of connecting parts 153 may be increased or decreased.

[0017] A stator module 20 is fixed to the hollow tube 13 and is located in the open space 17 and comprises a stator core 21 and a stator winding (not shown in the figure) distributed on the stator core 21 .

[0018] The rotating shaft 30 is a metal rod inserted into the passage 131 , with both ends protruding into the hollow tube 13 and exposed to the outside of the hollow cylinder 15 .

[0019] The support member 40 is connected to the rotating shaft 30 and seated in the passage 131. In this embodiment, the support member 40 has a bearing 41 and a locking unit 43. The rotating shaft 30 fits into the bearing 41 and is locked by the locking unit 43, so that the bearing 41 can be stabilized and the bearing 41 can be prevented from falling off the rotating shaft 30.

[0020] The rotor module 50 is inserted into the open space 17 and has a side cap 51. The side cap 51 is connected to the rotating shaft 30 and is exposed to the outside of the open space 17. The side cap 51 has eight vent holes 511 and four screw holes 513. The vent holes 511 are connected to the open space 17. The fastening members pass through the screw holes 513 and are fastened to the connecting member or the tool head to fasten the connecting member and the tool head.

[0021] As shown in Fig. 4, the connecting portion 153 of the hollow cylinder 15 is arranged symmetrically. The hollow cylinder 15 is perpendicular to the side stand 11. The hollow tube 13 is shorter than the hollow cylinder 15. The free end 133 of the hollow tube 13 is placed inside the open space 17. The passage 131 of the hollow tube 13 has a linear portion 135 and an expanded portion 137 connected together. The linear portion 135 extends from the free end 133 to the expanded portion 137. The expanded portion 137 is used to store the support member 40.

[0022] As shown in FIG. 5, the rotor module 50 further includes a plurality of magnets 53, a hollow sleeve 55, and a roller bearing 57. The hollow sleeve 55 is connected to the side cap 51 and disposed in the open space 17 between the hollow cylinder 15 and the stator module 20. The plurality of magnets 53 are connected to the hollow sleeve 55 so as to maintain a gap between the stator module 20. The plurality of magnets 53 are disposed in the hollow sleeve 55 at intervals, and adjacent magnets have different poles. The roller bearing 57 connects the rotating shaft 30 and the stator module 20, and is disposed between the side cap 51 and the hollow tube 13. Due to the above-mentioned structural features, the roller bearing 57 and the bearing 41 of the support member 40 can stabilize the rotating shaft 30 as two support points, thereby maintaining the rotation of the rotor module 50 in a stable state and preventing the rotor module 50 from vibrating.

[0023] In detail, the stator module 20 of the external rotor motor 100 according to the present invention is fixed to the hollow tube 13 of the frame 10 and is therefore immovable. The magnetic field generated by passing a current through the stator module 20 interacts with the magnetic field of the magnets 53 of the rotor module 50 to rotate the rotor module 50 and generate torque at the same time.

[0024] 6 and 7, the rotor module 50 further includes a connecting holder 59. The connecting holder 59 includes a disk 591, a plurality of fitting portions 593, a connecting tip portion 595, and four bolts 597. The disk 591 is disposed over the side cap 51.

[0025] A plurality of fitting portions 593 are formed on the disk 591 and fit into the position limiting portion of the side cap 51. In this embodiment, the fitting portion 593 is a tooth portion formed protruding from the right side of the disk 591. A part of the position limiting portion of the side cap 51 is the ventilation hole 511. In other words, as shown in Fig. 7, even if the tooth portion fits into the ventilation hole 511, it does not completely block the ventilation hole 511 and ensures a heat dissipation passage.

[0026] In another embodiment, the disk 591 and the fitting portion 593 have perforations 599 that are connected to the ventilation hole 511, and the perforations 599 dissipate heat. The number of fitting portions 593 and position limiting portions may be relatively increased or decreased, or there may be at least one. The fitting portion 593 and the position limiting portion are fitted together to improve the stability of the rotor during rotation. In other words, it is sufficient that the fitting portion 593 and the position limiting portion are fitted together. In the side cap 51, the position limiting portion is not limited to the ventilation hole 511, and may be another structure.

[0027] The connecting tip 595 protrudes from the disk 591 and is located on the left side of the disk 591. On the disk 591, the connecting tip 595 and the fitting portion 593 are arranged in positions facing away from each other. In this embodiment, the connecting tip 595 is a hollow hexagon facing the rotation shaft 30. A tool head of an electric tool can be connected via the connecting tip 595. A bolt 597 passes through the screw hole 592 of the disk 591 and is fastened to the screw hole 513 of the side cap 51 to fix the connecting holder 59 to the side cap 51.

[0028] (One embodiment) As shown in FIG. 8, the power tool 600 according to an embodiment of the present invention includes a housing 61, a tool head 63, a fan 65, and an outer rotor motor 100. The side of the housing 61 is omitted to clearly show the inside of the housing 61. The housing 61 has a number of positioning parts 611. The positioning parts 611 are formed by protruding into the housing 61, and correspond to the connecting parts 153, i.e., the recessed parts, to position the power tool 600. The outer rotor motor 100 is mounted in the housing 61 and between the tool head 63 and the fan 65. The connecting parts 153 of the hollow cylinder 15 are fitted into the positioning parts 611 to stabilize the outer rotor motor 100. The tool head 63 is connected to the connecting end part 595 of the connecting holder 59. The tool head 63 is a mechanism for transmitting and outputting torque by the rotational force of the outer rotor motor 100. The tool head 61 is a tool connector such as a hexagonal quick release connector, a screwdriver bit, a drill bit, a wrench, or the like.

[0029] The coupling holder 59 of the rotor module 50 of the outer rotor type motor 100 improves the stability of the entire structure by the fitting portion 593 and the position limiting portion of the side cap 51, and can prevent the bolt 597 from loosening and falling off due to the rotation torque. In another embodiment, when the torque is relatively small, the tool head 63 and the side cap 51 of the rotor module 50 may be coupled, or the coupling holder 59 may be omitted from the fitting portion 593.

[0030] In another embodiment, the application of the outer rotor type motor 100 of the present invention is not limited to power tools, but may also be applied to any working environment requiring rotational torque.

[0031] As described above, the present invention is not limited to the above-described embodiment, and can be embodied in various forms without departing from the spirit of the invention. [Explanation of symbols]

[0032] 100: External rotor motor 10: Frame 11: Side stand 111: Heat vent 13: Hollow tube 131: Passage 133: Free end 135: Straight line part 137: Expansion area 15: Hollow cylinder 151: Concave groove 153:Connection part 155: Free end 157: Outside 159: Inner wall surface 17:Open space 20: Stator module 21: Stator core 30: Rotation axis 40: Support member 41: Bearing 43: Rock Unit 50: Rotor module 51: Side cap 511: Vent 513: Screw hole 53: Magnet 55: Hollow sleeve 57: Roller bearing 59: Connecting holder 591: Disk 592: Screw hole 593: Fitting part 595:Connection tip 597: Bolt 599: Perforation 600: Power tools 61: Housing 611: Positioning section 63: Tool head 65: Fan

Claims

1. The rotor module includes a frame, a stator module, a rotating shaft, a support member, and a rotor module. the frame has a side stand, a hollow tube and a hollow cylinder, the side stand is connected to the hollow tube, the hollow tube has a passage, the hollow cylinder is connected to the side stand to form an open space between the side stand and the hollow tube, and the passage is connected to the open space; the stator module is coupled to the hollow tube and positioned within the open space; The rotating shaft is inserted into the passage, both ends of the rotating shaft protrude into the hollow tube, and one of the both ends is exposed to the outside of the hollow cylinder; the support member is connected to the shaft and positioned within the passage; The rotor module is inserted into the open space and has a side cap, the side cap is connected to the rotating shaft and is exposed to the outside of the open space; The stator module faces the frame to drive and rotate the rotor module; 2. An outer rotor type motor, comprising: a hollow cylindrical body of the frame having a plurality of connecting portions.

2. 2. The outer rotor type motor according to claim 1, wherein the side stand has a plurality of heat dissipation ports connected to the open space, the hollow cylinder has a plurality of grooves, the plurality of grooves are formed on the outside of the hollow cylinder to extend from a free end of the hollow cylinder to the side stand, and the free end and the side stand are located at opposite ends of the hollow cylinder.

3. 3. The outer rotor type motor according to claim 2, wherein a plurality of the grooves are connected to a plurality of the heat dissipation holes.

4. 3. The outer rotor type motor according to claim 2, wherein each of the plurality of connecting portions is a recessed portion and connects to adjacent ones of the plurality of recessed grooves.

5. 3. The outer rotor type motor according to claim 2, wherein the hollow cylinder has an inner wall surface which is entirely an arcuate surface, and the open space is defined by the inner wall surface.

6. The side cap has a position limiting portion, 2. The outer rotor type motor according to claim 1, wherein the rotor module further comprises a connecting holder, the connecting holder is connected to the side cap, and has a disk, a fitting portion and a connecting tip portion, the fitting portion is formed on the disk to be mutually fitted with the position limiting portion, and the connecting tip portion protrudes from the disk and faces away from the fitting portion.

7. 7. The outer rotor type motor according to claim 6, wherein the side cap has a plurality of vent holes connected to the open space, the position limiting portion is one of the plurality of vent holes, and the fitting portion has a perforation connected to one of the vent holes.

8. 2. The outer rotor type motor according to claim 1, wherein the rotor module further comprises a plurality of magnets, a hollow sleeve and a roller bearing, the hollow sleeve is connected to the side cap and disposed within the open space and between the hollow cylinder and the stator module, the plurality of magnets are connected to the hollow sleeve to maintain a distance from the stator module, and the roller bearing connects the rotating shaft and the stator module and is disposed between the side cap and the hollow tube.

9. 2. The outer rotor type motor according to claim 1, wherein the support member is disposed near the side stand of the frame.

10. A housing, a tool head, a fan, and an outer rotor type motor according to any one of claims 1 to 9, The housing has a plurality of positioning portions, the tool head and the fan are mounted within the housing; the outer rotor type motor is mounted in the housing and between the tool head and the fan, the plurality of connecting portions of the hollow cylinder are fitted to the plurality of positioning portions, The power tool, wherein the tool head is coupled to the rotor module.

Images