TWI746665B - Driver and driving device of electric nail gun - Google Patents

Abstract

A driver and a driving device for an electric nail gun. The electric nail gun has a frame. The driver includes an impact unit and a driving device. The impact unit is arranged on the frame. The driving device is used to drive the impact unit to produce a nail-driving action. The driving device includes a spindle extending along an axis, a rotor unit rotatably sleeved on the spindle, and a rotor unit for driving the rotor unit to rotate The stator unit, the rotor unit has a flywheel exposed and used to make frictional contact with the impact unit, a magnet mounting ring extending from the flywheel toward the stator unit and penetrating the stator unit, and a surrounding set on the magnet The stator unit includes a coil group surrounding the magnetic group and used to generate a magnetic field that drives the rotor unit to rotate.

Description

Driver and driving device of electric nail gun

The invention relates to an electric hand tool, in particular to a driver and a driving device of an electric nail gun.

Referring to Figures 1 and 2, a conventional electric nail gun drive device disclosed in the US Patent No. 8132702 is taken as an example. The drive device is used to transfer kinetic energy to an electric nail gun (not shown). The striking member 10 includes two brushless motors 1 arranged in parallel and sandwiching the striking member 10. Each brushless motor 1 has a central shaft 11, a central stator 12 fixed on the central shaft 11, and a An outer rotor 13 rotatably sleeved on the central shaft 11 and surrounding the central stator 12. The central stator 12 has a plurality of coils (not shown). The outer rotor 13 has a flywheel portion 131 and a flywheel portion 131 A mounting portion 132 extending outward along the direction of the central axis 11, two bearings 133 sleeved on the central axis 11 and connected to the flywheel portion 131, and an inner ring surface of the mounting portion 132 and surrounding the center The magnet group 134 of the stator 12. As a result, when the coils of the central stator 12 are turned on to drive the outer rotor 13 to rotate, kinetic energy can be transferred to the striking member 10 so that the striking member 10 can move at a high speed to complete the nailing action.

However, when the manufacturer wants to change the output kinetic energy of the brushless motor 1 to change the number of the coils of the central stator 12, it is limited that the central stator 12 is surrounded by the mounting portion 132 of the outer rotor 13, and it is necessary At the same time, the size of the outer rotor 13 and the size of the central stator 12 are changed, so the applicability is poor. In addition, since the central stator 12 is located between the mounting portion 132 of the outer rotor 13 and the central shaft 11, and occupies the space between the mounting portion 132 of the outer rotor 13 and the central shaft 11, the bearings 133 only The flywheel portion 131 that can be provided on the outer rotor 13 is suspended without any supporting point. Therefore, when the outer rotor 13 rotates, the center of gravity is easily shifted and the rotation becomes unstable.

Therefore, the object of the present invention is to provide a driver and a driving device for an electric nail gun that can rotate stably and has good applicability.

Therefore, in the driver of the electric nail gun of the present invention, the electric nail gun has a frame, and the driver includes an impact unit and a driving device, and the impact unit is arranged on the frame.

The driving device is arranged between the frame and the impact unit, and is used to drive the impact unit to produce a nailing action. The driving device includes a spindle extending along an axis and arranged on the frame, and a rotatable sleeve A rotor unit arranged on the spindle, and a stator unit arranged on the spindle and used to drive the rotor unit to rotate. The rotor unit has a flywheel that surrounds the spindle and is exposed and used for frictional contact with the impact unit, a magnet mounting ring extending from the flywheel along the axis toward the stator unit and penetrating the stator unit, and a surrounding A magnetic group arranged on an outer ring surface of the magnetic part mounting ring. The stator unit includes a coil group that surrounds and is spaced from the magnetic group and is used to generate a magnetic field for driving the rotor unit to rotate.

The driving device of the present invention is suitable for an electric nail gun, and is used to drive an impact unit to produce a nailing action. The electric nail gun has a frame, the impact unit is arranged on the frame, and the driving device includes a spindle, a Rotor unit, and certain sub-unit.

The mandrel extends along an axis and is arranged on the frame. The rotor unit is rotatably sleeved on the mandrel, and has a flywheel surrounding the mandrel and exposed outside and used for frictional contact with the impact unit, and a flywheel extending from the flywheel along the axis toward the stator unit and penetrating into the stator unit. The magnetic part mounting ring of the stator unit, and a magnetic group arranged around an outer ring surface of the magnetic part mounting ring, the flywheel is used for frictional contact with the impact unit and causes the impact unit to produce a nailing action. The stator unit is arranged on the spindle and used to drive the rotor unit to rotate. The stator unit includes a coil group surrounding the magnetic group and spaced from the magnetic group and used to generate a magnetic field for driving the rotor unit to rotate.

The effect of the present invention is that by setting the magnetic assembly on the outer ring surface of the magnet mounting ring, the space between the rotor unit and the spindle is reserved, so the rotor unit can be stably relative to the spindle When the number of coils in the coil group of the stator unit changes, only the size of the stator unit needs to be changed, and the size design of the rotor unit is not changed, which has good applicability.

Referring to FIGS. 3 and 4, the driver of the present invention is suitable for an electric nail gun 9 with a frame 2, and the driver includes an impact unit 3 and a driving device 4.

The impact unit 3 is disposed on the frame 2, and includes a swing arm 31 pivotally connected to the frame 2, and an impact member 32 movably disposed on the swing arm 31. In this embodiment, the impact The member 32 is magnetically attracted to the swing arm 31, and the impact member 32 has a plurality of protruding ribs 33.

The driving device 4 is arranged between the frame 2 and the impact unit 3, and is used to drive the impact unit 3 to generate nail-driving actions. The driving device 4 is essentially a brushless motor and includes a motor that extends along an axis L And a spindle 5 arranged on the frame 2, a rotor unit 6 rotatably sleeved on the spindle 5, and a stator unit 7 fixedly arranged on the spindle 5 and used to drive the rotor unit 6 to rotate .

Referring to FIGS. 3, 5 and 6, the rotor unit 6 includes a rotor housing 61, a magnetic group 62, a first bearing 63, a second bearing 64, and a fan 65. The rotor housing 61 is rotatably sleeved on the spindle 5 and has a flywheel 611 that surrounds the spindle 5 and is exposed, and a flywheel 611 extends along the axis L toward the stator unit 7 and penetrates the The magnetic part mounting ring 612 of the stator unit 7, the flywheel 611 is used to frictionally contact the impact part 32 and move the impact part 32 relative to the swing arm 31, the magnetic part mounting ring 612 has an outer ring surface 613, Preferably, the flywheel 611 and the magnet mounting ring 612 of the rotor unit 6 are integrally formed. In this embodiment, the outer ring surface of the flywheel 611 has a plurality of grooves 614 for sliding the protruding ribs 33 of the impact member 32. The magnetic assembly 62 is arranged around the outer ring surface 613 of the magnet mounting ring 612, and has a magnet base 621 set into the magnet mounting ring 612, and a plurality of magnet bases 621 surrounding the spindle 5 and penetrating through the magnet base 621 And fixed to the magnet 622 of the magnet base 621. The first bearing 63 is arranged on the rotor housing 61 and sleeved on the spindle 5 between the spindle 5 and the flywheel 611, and the second bearing 64 is arranged on the rotor housing 61 and sleeved on the core The shaft 5 is located between the spindle 5 and the magnet mounting ring 612, and the fan 65 is installed in the flywheel 611 for heat dissipation.

The stator unit 7 includes a stator housing 71, a magnetic conductive group 72, a coil group 73, a control board 74, and several sensors 75. The stator housing 71 has a seat portion 711 disposed on the spindle 5, and an electromagnetic positioning portion 712 extending from the seat portion 711 in the direction of the flywheel 611 along the axis L. The electromagnetic positioning portion 712 and the flywheel 611 is spaced apart on the axis L, and at least a part of the magnet mounting ring 612 is located in the electromagnetic positioning portion 712. Preferably, the outer diameter of the flywheel 611 is larger than the outer diameter of the stator housing 71. The magnetically permeable group 72 surrounds the spindle 5 and penetrates the electromagnetic positioning portion 712 and is fixed to the electromagnetic locating portion 712. The magnetically permeable group 72 is used to form a magnetic circuit. In this embodiment, the magnetically permeable group 72 is A kind of silicon steel sheet. The coil group 73 penetrates the magnetic group 72 and is fixed to the magnetic group 72. At the same time, the magnetic group 72 and the coil group 73 surround the magnetic group 62 and are spaced apart from the magnetic group 62 and are used to generate driving The magnetic field generated by the rotation of the rotor unit 6, the coil group 73 has a plurality of coils 731 surrounding the axis L, and each coil 731 increases the number of coil turns in a direction perpendicular to the axis L. The control board 74 is disposed on the seat 711, and the sensors 75 are disposed on the control board 74 and are electrically connected to the control board 74 to detect the rotation position of the rotor unit 6.

When the stator unit 7 is energized, the control board 74 will sense the rotation position of the rotor unit 6 according to the sensors 75 to determine the direction of the current. Then, the control current flows through the coils 731 in order to generate The rotating magnetic field interacts with the magnetic group 62 of the rotor unit 6 to drive the rotor unit 6 to start rotating.

Thereby, when the rotor unit 6 starts to rotate, and the swing arm 31 links the impact member 32 to contact the flywheel 611 of the rotor unit 6, the grooves 614 of the flywheel 611 and the impact members 32 The protruding rib 33 is in frictional contact, and the flywheel 611 transfers rotational energy to the impact member 32, causing the impact member 32 to move at a high speed relative to the swing arm 31 to complete the nail driving action.

Through the above description, the advantages of the present invention can be summarized as follows:

1. In the present invention, the stator unit 7 and the rotor unit 6 are designed in a concave-convex configuration, and the magnetic assembly 62 is sleeved on the outer ring surface 613 of the magnet mounting ring 612, so that the magnet mounting ring 612 can be retained. The space between the rotor unit 6 and the spindle 5 enables the rotor unit 6 and the spindle 5 to be stably connected through the first bearing 63 and the second bearing 64, so that the rotor unit 6 can rotate stably.

2. In addition, since the stator unit 7 is sleeved outside the rotor unit 6, when the number of coils 731 of the coil group 73 is changed, the present invention only needs to change the size of the stator unit 7 without changing the The size of the rotor unit 6 is designed, therefore, the applicability is good.

3. In the present invention, by arranging the second bearing 64 between the spindle 5 and the magnet mounting ring 612, the magnet mounting ring 612 will not be suspended. Therefore, the rotor unit 6 can be relative to the spindle 5 Rotate smoothly.

4. In the present invention, the flywheel 611 and the magnet mounting ring 612 of the rotor unit 6 are integrally formed into one part, which can improve the output efficiency of the driving device 4.

In summary, the driver of the present invention has stable rotation, high output efficiency and good applicability, so it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

2‧‧‧Frame 3‧‧‧Impact Unit 31‧‧‧Swing Arm 32 ‧‧Rotor housing 611‧‧‧Flywheel 612‧‧‧Magnetic part mounting ring 613‧‧‧Outer ring surface 614‧‧‧Concave 62‧‧‧Magnetic group 621‧‧‧Magnet group 622‧‧‧Magnet 63‧ ‧‧First bearing 64‧‧‧Second bearing 65‧‧‧Fan 7‧‧‧Stator unit 71‧‧‧Stator housing 711‧‧‧Seat 712‧‧‧Electromagnetic positioning part 72‧‧‧Magnetic permeable group 73‧‧‧Coil group 731‧‧‧Coil 74‧‧‧Control board 75‧‧‧Sensor 9‧‧‧Electric nail gun L‧‧‧Axis

The other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a perspective view illustrating that the driving device of an electric nail gun in US Patent No. 8,132,702 includes two Brush motor; Figure 2 is a perspective view of the brushless motor of US Patent No. 8132702; Figure 3 is a perspective view illustrating an embodiment of the driver of the present invention installed in an electric nail gun with a frame; Figure 4 Fig. 5 is a three-dimensional exploded view of this embodiment; and Fig. 6 is a cross-sectional view taken along the line IV-IV of Fig. 4.

4‧‧‧Drive device

5‧‧‧Mandrel

6‧‧‧Rotor unit

61‧‧‧Rotor housing

611‧‧‧Flywheel

612‧‧‧Magnetic part mounting ring

613‧‧‧Outer Ring

614‧‧‧Ditch

64‧‧‧Second Bearing

65‧‧‧Fan

7‧‧‧Stator unit

71‧‧‧Stator housing

711‧‧‧Seat

712‧‧‧Electromagnetic Positioning Unit

72‧‧‧Magnetic permeable group

73‧‧‧Coil Set

62‧‧‧Magnetic Group

621‧‧‧Magnet Set

622‧‧‧Magnet

63‧‧‧First bearing

731‧‧‧Coil

74‧‧‧Control Panel

75‧‧‧Sensor

L‧‧‧Axis

Claims (19)

A driver for an electric nail gun. The electric nail gun has a frame. The driver includes: an impact unit arranged on the frame; and a driving device arranged between the frame and the impact unit and used for driving The impact unit generates a nail-driving action, and the driving device includes a spindle extending along an axis and arranged on the frame, a rotor unit rotatably sleeved on the spindle, and a rotor unit arranged on the spindle and used A stator unit for driving the rotor unit to rotate. The rotor unit has a flywheel that surrounds the spindle and is exposed and used to make frictional contact with the impact unit, and a flywheel that extends along the axis toward the stator unit and penetrates into the stator. The magnetic part mounting ring of the unit, and a magnetic group arranged around an outer ring surface of the magnetic part mounting ring, the stator unit includes a surrounding and spaced apart from the magnetic group and used to generate and drive the rotor unit The coil group of the rotating magnetic field. The driver of the electric nail gun according to claim 1, wherein the stator unit further includes a magnetic permeable group that surrounds the mandrel and is used to form a magnetic circuit, and the coil group penetrates into the magnetic permeable group and is fixed to the magnetic permeable group. Magnetic group. The driver of the electric nail gun according to claim 2, wherein the stator unit further includes a stator housing, and the stator housing has a seat provided on the spindle, and a seat facing from the seat along the axis. At least a part of the magnetic part mounting ring is located in the electromagnetic positioning part that extends in the direction of the flywheel and allows the magnetic permeable group to penetrate and be fixed. The driver of the electric nail gun according to claim 3, wherein the coil group has a plurality of coils surrounding the axis, and each coil increases the number of coil turns in a direction perpendicular to the axis. The driver of the electric nail gun according to claim 1, wherein the rotor unit further includes a rotor housing rotatably sleeved on the spindle, a first bearing provided on the rotor housing, and a set On the second bearing of the rotor housing, the rotor housing has the flywheel and the magnet mounting ring, the first bearing is sleeved on the mandrel and located between the mandrel and the flywheel, and the second bearing is sleeved On the mandrel and between the mandrel and the magnet mounting ring. The driver of the electric nail gun according to claim 3, wherein the stator unit further includes a control board provided on the seat, and at least one control board provided on the control board and electrically connected to the control board and used for detecting the A sensor for the rotation position of the rotor unit. The driver of the electric nail gun according to claim 2, wherein the magnetic assembly of the rotor unit has a magnet holder set into the magnet mounting ring, and a plurality of magnet holders that surround the spindle and penetrate into the magnet holder and are fixed to The magnet of the magnet holder. The driver of the electric nail gun according to claim 1, wherein the rotor unit further includes a fan arranged on the flywheel and used for heat dissipation. The driver for an electric nail gun according to claim 1, wherein the impact unit includes a swing arm pivotally connected to the frame, and an impact member movably arranged on the swing arm, and the flywheel is used to interact with the swing arm. The impact member frictionally contacts and moves the impact member relative to the swing arm. The driver of the electric nail gun according to claim 1, wherein the flywheel and the magnet mounting ring of the rotor unit are integrally formed. A driving device is suitable for an electric nail gun, and is used to drive an impact unit to produce a nailing action. The electric nail gun has a frame, and the impact unit is arranged on the frame. The driving device includes: a spindle along a The axis extends and is arranged on the frame; a rotor unit is rotatably sleeved on the mandrel, has a flywheel surrounding the mandrel and exposed and used for frictional contact with the impact unit, and a flywheel along the axis A magnetic component mounting ring extending toward the stator unit and penetrating into the stator unit, and a magnetic assembly arranged around an outer ring surface of the magnetic component mounting ring, the flywheel is used to make frictional contact with the impact unit and make the impact The unit generates a nailing action; and a certain sub-unit is arranged on the spindle and used to drive the rotor unit to rotate. The stator unit includes a surrounding and spaced apart from the magnetic group and is used to generate and drive the rotor unit to rotate Coil group of the magnetic field. The driving device according to claim 11, wherein the stator unit further includes a magnetic permeable group surrounding the mandrel and used to form a magnetic circuit, and the coil group penetrates the magnetic permeable group and is fixed to the magnetic permeable group . The driving device according to claim 12, wherein the stator unit further includes a stator housing, the stator housing having a seat provided on the spindle, and a seat facing the flywheel along the axis from the seat At least a part of the magnetic part mounting ring is located in the electromagnetic positioning portion extending in the direction and allowing the magnetic conductive group to penetrate and be fixed. The driving device according to claim 13, wherein the coil group has a plurality of coils surrounding the axis, and each coil increases the number of coil turns in a direction perpendicular to the axis. The driving device according to claim 11, wherein the rotor unit further includes a rotor housing rotatably sleeved on the spindle, a first bearing provided on the rotor housing, and a first bearing provided on the rotor The second bearing of the housing, the rotor housing has the flywheel and the magnet mounting ring, the first bearing is sleeved on the mandrel and between the mandrel and the flywheel, and the second bearing is sleeved on the core The shaft is located between the mandrel and the magnet mounting ring. The driving device according to claim 13, wherein the stator unit further includes a control board provided on the seat, and at least one control board provided on the control board and electrically connected to the control board and used for detecting the rotor unit Sensors for rotating position. The driving device according to claim 12, wherein the magnetic assembly of the rotor unit has a magnet holder set in the magnet mounting ring, and a plurality of magnet holders that surround the spindle and penetrate into the magnet holder and are fixed to the magnet holder Magnet. The driving device according to claim 11, wherein the rotor unit further includes a fan arranged on the flywheel and used for heat dissipation. The driving device according to claim 11, wherein the flywheel of the rotor unit and the magnet mounting ring are integrally formed.

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