JP6437370B2 - Electric tool - Google Patents

Description

  The present invention relates to an electric tool that uses the rotational force of a motor.

  Japanese Patent Application Laid-Open No. 2004-133867 discloses an electric tool that applies a rotational force to a tip tool by a motor and tightens a screw or a bolt. In this electric power tool 100, as shown in FIG. 13, a ferrite core 105 for noise prevention is housed sideways at the rear of the housing body 101 that houses the motor 102 coaxially. The ferrite core 105 is a cylindrical magnetic body, and a wiring 102m for the motor 102 is passed inside. The ferrite core 105 is constrained from the outside in the radial direction by a plurality of holding ribs 101r formed on the inner wall surface of the housing body 101 so that the ferrite core 105 does not break due to vibration or impact. Further, an axial rib 101j formed on the inner wall surface of the housing body 101 is passed through the ferrite core 105.

JP 2011-143499 A

  The power tool described above has a configuration in which the ferrite core 105 is constrained from the outside in the radial direction by a plurality of holding ribs 101r formed on the inner wall surface of the housing body 101. For this reason, a space for forming the holding rib 101r is required. Further, it is necessary to change the arrangement of the holding ribs 101r according to the outer diameter size of the ferrite core 105 and the like. Further, for example, when a plurality of ferrite cores are close to each other, it is necessary to take measures such as sandwiching a vibration absorbing sponge between the ferrite cores. For this reason, the support structure of the ferrite core 105 becomes complicated.

  The present invention has been made to solve the above-mentioned problems, and the problem to be solved by the present invention is to simplify the support structure of the ferrite core for noise prevention and to further save space. It is.

The above-described problems are solved by the inventions of the claims. The invention of claim 1 is an electric tool including an electric circuit board, and is in a state parallel to a bottom surface of a cylindrical ferrite core through which an electric wire electrically connecting the electric circuit board and an electric component is passed. A case for housing the electric circuit board, and a resin for integrating the electric circuit board and the case in a solidified state by filling the case in a molten state and filling the case. and, wherein the ferrite core is in a state in which the wire is passed, for the electric circuit board to which the electric wire is electrically connected, it is fixed through the resin covering the upper surface of the electric circuit board ing.

According to the present invention, the ferrite core is fixed to the electric circuit board to which the electric wire is electrically connected in a state where the electric wire is passed. For this reason, it is not necessary to provide a rib or the like for supporting the ferrite core in the housing of the electric tool. Further, even when a plurality of ferrite cores are close to each other, it is not necessary to sandwich a vibration absorbing sponge or the like between the ferrite cores. This simplifies the support structure of the ferrite core and saves space. In addition, when the electric circuit board is embedded in resin, the ferrite core can be fixed to the electric circuit board.

According to the invention of claim 2 , the electric circuit board is a board for controlling the motor.

According to the invention of claim 3 , the ferrite core is fixed to the electric circuit board by filling a part of the ferrite core with resin. For this reason, the space can be saved as much as the ferrite core is buried in the resin.

According to the invention of claim 4 , the ferrite core is buried in the resin in a non-contact state with the electric circuit board. For this reason, insulation between the electric circuit board and the ferrite core can be ensured.

According to the invention of claim 5 , the ferrite core is fixed to the electric circuit board by being bonded to the solidified resin. For this reason, even after the electric circuit board and the case are integrated with resin, the ferrite core can be fixed to the electric circuit board.

According to the invention of claim 6 , the ferrite core is fixed to the electric circuit board so that the axis of the ferrite core intersects the electric circuit board. According to the invention of claim 7 , the ferrite core is fixed to the electric circuit board in a state where the axis of the ferrite core is parallel to the electric circuit board.

According to the invention of claim 8 , the ferrite core passes the electric wire that electrically connects the motor, which is an electric component, and the electric circuit board. According to the ninth aspect of the present invention, the ferrite core is passed with the electric wire that electrically connects the voltage smoothing capacitor, which is an electric component, and the electric circuit board. According to the invention of claim 10 , the ferrite core is passed with the electric wire that electrically connects the battery or the power source as the electric component and the electric circuit board.

  According to the present invention, the structure for supporting a ferrite core for preventing noise can be simplified and space can be saved.

It is a perspective view showing the electric tool which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the said electric tool. It is a wiring connection diagram of the control part (electric circuit board) of the electric power tool. It is a model perspective view showing the adhering state of the electric circuit board and ferrite core of the electric tool. It is a model longitudinal cross-sectional view showing the adhering state of the said electric circuit board | substrate and a ferrite core. It is a schematic longitudinal cross-sectional view showing the adhering state of the said electric circuit board | substrate and ferrite core which concern on the example of a change. It is a schematic longitudinal cross-sectional view showing the adhering state of the said electric circuit board | substrate and ferrite core which concern on the example of a change. It is a schematic longitudinal cross-sectional view showing the adhering state of the said electric circuit board | substrate and ferrite core which concern on the example of a change. It is a schematic longitudinal cross-sectional view showing the adhering state of the said electric circuit board | substrate and ferrite core which concern on the example of a change. 2 is a schematic perspective view of the ferrite core. FIG. It is a model perspective view of the ferrite core concerning a modification. It is a model perspective view of the ferrite core concerning a modification. It is a longitudinal cross-sectional view showing the support structure of the ferrite core in the conventional electric tool.

[Embodiment 1]
Hereinafter, based on FIGS. 1-12, the electric tool which concerns on Embodiment 1 of this invention is demonstrated. The electric tool according to the present embodiment is a battery-driven impact driver (hereinafter referred to as electric tool 10). Here, front and rear, right and left, and up and down shown in the figure correspond to front and rear, right and left, and up and down of the power tool 10.

<About the outline of the electric power tool 10>
As shown in FIGS. 1 and 2, the electric power tool 10 includes a cylindrical housing body 12 and a grip part 14 formed so as to protrude downward from the lower end surface of the housing body 12. It is configured in a T shape. As shown in FIG. 2, the housing main body 12 houses a motor 11m as a power source, a gear mechanism 11w, and a striking force generation mechanism 11p in order from the rear side so as to be substantially coaxial. An anvil 17 protrudes in the axial direction from the front end portion of the housing main body 12, and a chuck portion 17 t for mounting a driver bit, a socket bit or the like (not shown) is provided at the tip end portion of the anvil 17. .

  As shown in FIG. 2, the grip portion 14 includes a main switch 22 for driving the motor 11 m and a changeover switch 24 for switching the rotation direction of the motor in the vicinity of the boundary position with the housing main body portion 12 (upper end position). Is provided. The main switch 22 includes a switch body 22m housed in the grip 14 and a trigger 22t that protrudes forward from the grip 14 and can be pulled. The changeover switch 24 is provided above the switch body 22m of the main switch 22. Further, as shown in FIG. 1, a battery mounting portion 15 to which the battery pack 30 is connected is provided at the lower end position of the grip portion 14. The battery mounting portion 15 is formed in a rectangular lid shape that extends in the width direction (left-right direction) and forward with respect to the grip portion 14, and is connected by the battery pack 30 being relatively slid rearward in a horizontal state. It is configured as follows.

<About the control part 40 of the electric tool 10>
As shown in FIGS. 3 and 4, the control unit 40 of the electric tool 10 includes an electric circuit board 41 that controls the motor 11 m that is a power source, a case 45 that houses the electric circuit board 41, and the like. Yes. The electric circuit board 41 is configured to operate a switching element (not shown) based on output signals of the main switch 22 and the changeover switch 24 and to control the power supplied from the battery pack 30 to the motor 11m. For example, the electric circuit board 41 is configured to control the power supplied to the motor 11m in accordance with the increase / decrease of the pulling operation amount of the trigger 22t of the main switch 22 and to increase / decrease the rotation speed of the motor 11m. The electric circuit board 41 is configured to be able to switch the rotation direction of the motor 11m in accordance with the output signal of the changeover switch 24. The electric circuit board 41 is formed in a rectangular flat plate shape.

  As shown in FIG. 3, power supply lines L <b> 1 and L <b> 2 for supplying power from the battery pack 30 are electrically connected to the electric circuit board 41 in a state where the power supply lines L <b> 1 and L <b> 2 are passed through the ferrite core 50 for noise prevention. The ferrite core 50 is a ceramic magnetic body used as a filter for absorbing high-frequency noise, and is configured so as to allow the electric wire to pass through the inner through hole 51 as shown in FIG. ing. In addition, the power lines ML1 and ML2 of the motor 11m are electrically connected to the electric circuit board 41 in a state where the power lines ML1 and ML2 are also passed through the ferrite core 50.

  Furthermore, the lead wires SL1 and SL2 of the main switch 22 and the lead wires SL3 and SL4 of the changeover switch 24 are electrically connected to the electric circuit board 41 in a state where they are passed through the ferrite core 50, respectively. The electric circuit board 41 is electrically connected to a voltage smoothing capacitor 43 for suppressing fluctuations in the power supply voltage due to the operation of the switching element. The lead wires LC1 and LC2 of the voltage smoothing capacitor 43 are also connected to the electric circuit board 41 while being passed through the ferrite core 50.

  The power lines L1, L2, power lines ML1, ML2, lead wires SL1, SL2, SL3, SL4, LC1, LC2, and the like are connected to the electric circuit board 41 at a substantially right angle (FIG. 5). Etc.). For this reason, the cylindrical ferrite core 50 through which the electric wire is passed is held by the electric wire so that the axis of the ferrite core 50 is substantially perpendicular to the electric circuit board 41. It is possible to make the axis of the ferrite core 50 substantially parallel to the electric circuit board 41 by bending the electric wire in the lateral direction.

<Fixing the electric circuit board 41 and the ferrite core 50>
The electric circuit board 41 has power lines L1, L2, power lines ML1, ML2, and lead lines SL1, SL2, SL3, SL4, LC1, LC2, etc. connected to each other as shown in FIGS. In addition, it is housed in a case 45 and integrated with the case 45 by a resin 44. The case 45 is a shallow rectangular open top aluminum container, and is used as a container for storing the molten resin 44 and also as a heat radiating plate for a heat generating component of the electric circuit board 41. When fixing the electric circuit board 41 to the case 45, first, the molten resin 44 is injected into the case 45 up to a predetermined amount (position of level H0 in FIG. 5). Next, the electric circuit board 41 is stored in a state parallel to the bottom surface of the case 45. In this state, the molten resin 44 is injected again to the level H1 position in the case 45 (see FIG. 5), and the electric circuit board 41 is filled with the molten resin 44 by a certain depth.

  Next, when the molten resin 44 is solidified, the ferrite core 50 through which the electric wire is passed is set on the upper surface (level H1 position) of the resin 44 in the case 45 in a state of being substantially perpendicular to the electric circuit board 41. The In this state, the molten resin 44 is again injected into the case 45 to a predetermined level position. As a result, as shown in FIG. 5, the lower portion of the ferrite core 50 is buried in the molten resin 44. Therefore, when the molten resin 44 is solidified in this state, the ferrite core 50 is fixed to the electric circuit board 41 by the resin 44 and the electric circuit board 41 is integrated with the case 45 by the resin 44. Here, as the resin 44, urethane resin or epoxy resin is preferably used.

  As described above, the ferrite core 50 is set on the upper surface (position of level H1) of the resin 44 in which the electric circuit board 41 is filled, and the ferrite core 50 is then injected into the electric circuit for the purpose of injecting the molten resin 44 again. The resin 44 can be buried in a non-contact state with the substrate 41. 4 and 5, the electric circuit board 41 and the ferrite core 50 are integrated with the case 45 by the resin 44, whereby the control unit 40 of the electric power tool 10 is completed. As shown in FIG. 2, the control unit 40 of the electric power tool 10 is attached to the ceiling portion of the battery mounting portion 15 provided at the lower end position of the grip portion 14.

<Advantages of the electric power tool 10 according to the present embodiment>
According to the electric tool 10 according to the present embodiment, the ferrite core 50 is fixed to the electric circuit board 41 to which the electric wire is electrically connected in a state where the electric wire is passed. For this reason, it is not necessary to provide a rib or the like for supporting the ferrite core 50 in the housing main body portion or the grip portion 14 of the electric power tool 10. Further, even when a plurality of ferrite cores 50 are close to each other, it is not necessary to sandwich a vibration absorbing sponge or the like between the ferrite cores 50. For this reason, the support structure of the ferrite core 50 is simplified and space can be saved.

  Further, when embedding the electric circuit board 41 in the resin 44, the ferrite core 50 can be fixed to the electric circuit board 41, so that it does not take time and effort. In addition, since a portion of the ferrite core 50 is embedded in the resin 44, the ferrite core 50 is fixed to the electric circuit board 41, so that space can be saved by the amount of the ferrite core 50 embedded in the resin 44. Furthermore, since the ferrite core 50 is buried in the resin in a non-contact state with the electric circuit board 41, insulation between the electric circuit board 41 and the ferrite core 50 can be ensured.

<Example of change>
Here, the present invention is not limited to the above-described embodiment, and can be modified without departing from the gist of the present invention. For example, in the present embodiment, as shown in FIG. 5, the example in which the ferrite core 50 is buried in the resin 44 in a non-contact state with respect to the electric circuit board 41 is shown. However, depending on the type of the ferrite core 50, as shown in FIG. 6, the ferrite core 50 can be buried in the resin 44 up to a position in contact with the electric circuit board 41. Thereby, the ferrite core 50 can be deeply buried in the resin 44, and space can be saved. In the present embodiment, the ferrite core 50 is fixed to the electric circuit board 41 with the resin 44 in a state where the axis of the ferrite core 50 is substantially perpendicular to the electric circuit board 41. However, as shown in FIG. 7, it is possible to fix the ferrite core 50 to the electric circuit board 41 with the resin 44 in a state where the axis of the ferrite core 50 is parallel to the electric circuit board 41. In addition, in FIG. 6, FIG. 7, etc., the electric wire is abbreviate | omitted.

  Further, in the present embodiment, as shown in FIG. 5, the example in which the ferrite core 50 is fixed to the electric circuit board 41 using the resin 44 filling the electric circuit board 41 is shown. However, as shown in FIGS. 8 and 9, after the electric circuit board 41 is integrated with the case 45 by the resin 44, the ferrite core 50 can be fixed to the solidified resin 44 by the adhesive 47. . Accordingly, the step of integrating the electric circuit board 41 and the case 45 with the resin 44 and the step of fixing the ferrite core 50 to the electric circuit board 41 can be performed at different locations.

  In the present embodiment, the cylindrical ferrite core 50 is illustrated as shown in FIG. 10, but as shown in FIG. 11, the rectangular ferrite core 50 having the through hole 51 in the center is used. Is also possible. In the case of the rectangular cylindrical ferrite core 50, the fixing area between the ferrite core 50 and the resin 44 can be increased in a state where the axis is parallel to the electric circuit board 41. Moreover, in this embodiment, as shown in FIG. 10 etc., although the ferrite core 50 provided with the through-hole 51 in the center was illustrated, as shown in FIG. 12, the ferrite core 50 provided with the several through-hole 51 is used. It is also possible. In the present embodiment, an example in which an aluminum case is used as the case 45 has been described. However, for example, a resin case may be used instead of the aluminum case. In the present embodiment, a battery-driven impact driver is exemplified as the electric tool 10, but the present invention can also be applied to the electric tool 10 driven by an AC power source of an outlet. In addition to the impact driver, not only electric drills, electric drivers, etc., but also electric tools such as electric hedge trimmers, electric mowers, electric lawn mowers, electric chainsaws, electric reciprocating saws, electric grinders, etc. It is also possible to apply the present invention.

10 ... Electric tool 11m ... Motor 41 ... Electric circuit board 43 ... Voltage smoothing capacitor 44 ... Resin 45 ... Case 47 ... Adhesive 50 ... ···Ferrite core

Claims (10)

An electric tool including an electric circuit board,
A cylindrical ferrite core through which an electric wire electrically connecting the electrical circuit board and the electrical component is passed ;
A case for storing the electric circuit board in a state parallel to the bottom surface;
Filling the electrical circuit board by being filled in the case in a molten state, and having a resin that integrates the electrical circuit board and the case in a solidified state;
The ferrite core is in a state in which the wire is passed, for the electric circuit board to which the electric wire is electrically connected, they are fixed via the resin covering the upper surface of the electric circuit board electric tool. The electric tool according to claim 1,
The electric circuit board is a power tool which is a board for controlling a motor. The electric tool according to claim 1 or 2,
The ferrite core is a power tool that is fixed to the electric circuit board by filling a part of the ferrite core with resin . The electric tool according to claim 3 ,
The electric power tool in which the ferrite core is embedded in a resin in a non-contact state with the electric circuit board . The electric tool according to claim 1 or 2 ,
The power tool is fixed to the electric circuit board by bonding the ferrite core to the solidified resin . The electric tool according to any one of claims 1 to 5 ,
The power tool fixed to the electric circuit board so that the axis of the ferrite core intersects the electric circuit board . The electric tool according to any one of claims 1 to 5 ,
The ferrite core is an electric tool fixed to the electric circuit board in a state where the axis of the ferrite core is parallel to the electric circuit board . The electric tool according to any one of claims 1 to 7 ,
The electric power tool which the electric wire which electrically connects the motor and electric circuit board which are the said electrical components is passed through the said ferrite core . The electric tool according to any one of claims 1 to 7 ,
The electric power tool which the electric wire which electrically connects the capacitor | condenser for voltage smoothing which is the said electrical component, and an electric circuit board is passed through the said ferrite core . The electric tool according to any one of claims 1 to 7 ,
An electric tool in which an electric wire electrically connecting a battery or a power source as the electric component and an electric circuit board is passed through the ferrite core .

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