JP2014054080A - Electrical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the waterproofness of an opening portion for brush replacement in a housing of an electrical device.SOLUTION: In an electrical device according to this invention, a motor with a brush serving as a drive source is housed in a housing and the housing is provided with an opening 28 for replacing the brush of the motor and a lid 60 which closes the opening 28. A watertight member 66, which prevents water from intruding from a space between the lid 60 and the opening 28 in a state where the lid 60 closes the opening 28, is provided between the opening 28 of the housing and the lid 60.

Description

  The present invention relates to an electric device in which a motor with a brush as a driving source is accommodated in a housing, and an opening for brush replacement of the motor and a lid for closing the opening are provided in the housing. .

A conventional electric device related to this is described in Patent Document 1.
The electric device in Patent Document 1 is an impact driver 100 using a motor with a brush as a drive source, and a motor 104 with a brush is coaxially accommodated in a rear portion of a cylindrical housing 102 as shown in FIG. A commutator 104c is provided at the rear part of the rotor 104r of the motor 104, and the tips of the pair of carbon brushes 105 are in sliding contact with the commutator 104c from the outside in the radial direction. The carbon brush 105 is disposed so as to sandwich the commutator 104c from both sides via a brush holder 106 attached to the rear portion of the housing 102.
Both carbon brushes 105 are detachably attached to the brush holder 106, and can be taken out of the housing 102 through brush replacement openings 102h provided on both sides of the rear portion of the housing 102. Further, caps 107 are attached to the heads of the carbon brushes 105, and the caps 107 are fixed to the brush holder 106 by a screw action in a state where the caps 107 are inserted into the brush replacement openings 102 h of the housing 102. It is like that.
For this reason, by removing the cap 107 from the brush holder 106, the carbon brush 105 can be taken out of the housing 102 with the cap 107.

JP 2002-018747 A

The impact driver 100 described above has a configuration in which the cap 102 of the carbon brush 105 fixed to the brush holder 106 is inserted into the brush replacement opening 102h of the housing 102 to close the opening 102h.
For this reason, for example, when water splashes on the housing 102, water may enter the housing 102 from a gap (not shown) between the brush replacement opening 102 h of the housing 102 and the cap 107 of the carbon brush 105. .

  The present invention has been made to solve the above-described problems, and an object of the present invention is to improve the waterproofness of the opening portion for brush replacement in the housing of the electric device.

The above-described problems are solved by the inventions of the claims.
According to the first aspect of the present invention, a motor with a brush as a drive source is accommodated in a housing, and an opening for brush replacement of the motor and a lid for closing the opening are provided in the housing. It is an electric device, and an anti-soaking member is provided between the opening of the housing and the lid so as to prevent water from entering between the lid and the opening while the lid closes the opening. Is provided.

According to the present invention, since the water-proof member is provided between the opening portion and the lid portion of the housing, intrusion of water from between the lid portion and the opening portion with the lid portion closing the opening portion. Can be prevented.
For this reason, the waterproofness improvement of the opening part for brush replacement | exchange in the housing of an electric equipment can be aimed at.

According to the invention of claim 2, a brush holder having a brush housing hole formed coaxially with the opening is provided inside the opening of the housing in a state of being supported by the housing, and the lid is The housing is configured to close the opening of the housing in a state where the brush housing hole of the brush holder housing the shaft-shaped brush is closed.
Thus, since the lid is configured to simultaneously close the opening of the housing while the brush housing hole of the brush holder is closed, the number of parts can be reduced.

According to the invention of claim 3, the opening portion of the housing extends in the axial direction of the opening portion at the peripheral position of the opening portion, and protrudes inward of the housing, and the axial center of the cylindrical portion. And an inner flange portion projecting radially inward at the tip end in the direction, and the lid portion is coaxially housed in the cylindrical portion of the opening portion, and a water-proof member is disposed on the outer periphery of the lid portion The lid portion is coaxially accommodated in the cylindrical portion of the opening portion, and the water-proof member contacts the inner flange portion over the entire circumference, so that the gap between the opening portion and the lid portion is It is the structure which is intended to seal.
As described above, since the anti-soaking member is disposed on the outer periphery of the lid portion and the lid portion is coaxially accommodated in the cylindrical portion of the opening of the housing, the lid portion can be made compact. Furthermore, since the lid portion does not protrude to the outside of the housing, the lid portion does not get in the way when using an electric device.

According to invention of Claim 4, a cover part is formed in the cap shape covered on a brush holder, and is the structure fixed to the said brush holder by the effect | action of a screw, The said cover part is tightened by the said screw | thread. The water-proof member arranged on the outer periphery of the housing is configured to be pressed against the inner flange portion of the opening of the housing.
According to invention of Claim 5, the recessed part by which a water-proof member is fitted is formed in the outer peripheral surface of a cover part, It is characterized by the above-mentioned.
For this reason, when the lid is attached to or removed from the opening of the housing, the water-proof member does not fall off from the lid, and workability is improved.

According to a sixth aspect of the present invention, the inner flange portion is formed such that a surface with which the water-proof member contacts is a tapered concave surface.
For this reason, a water-proof member comes to be simultaneously pressed from an axial direction and a radial direction outer side, and a sealing performance improves.

  ADVANTAGE OF THE INVENTION According to this invention, the waterproofness improvement of the opening part for brush replacement | exchange in the housing of an electric equipment can be aimed at.

It is a side view of the electric driver which concerns on Embodiment 1 of this invention. It is an II arrow enlarged view of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. 4 is an enlarged view taken along arrow IV in FIG. 3. It is sectional drawing showing the brush structure of the conventional impact driver.

[Embodiment 1]
Hereinafter, the electric apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. The electrical device according to the present embodiment is a rechargeable electric driver 10 and includes a driver main body 20 and a battery pack 30 configured to be connected to and disconnected from the driver main body 20.
Here, front and rear, right and left, and up and down in the figure correspond to front and rear, right and left and up and down in the electric driver 10.

<About the outline of the electric driver 10>
A driver main body 20 of the electric driver 10 is a handy type electric tool used for screw tightening or the like. As shown in FIG. 1, a cylindrical housing main body 22 and a lower side from the lower end surface of the housing main body 22 are provided. It is formed in the side surface substantially T shape from the grip part 24 which protrudes in a direction.
The housing main body 22 accommodates a brush motor 40 (see FIG. 3), a gear mechanism (not shown), and the like, which are driving sources of the driver main body 20, so as to be substantially coaxial with the housing main body 22. An output shaft (not shown) projects in the axial direction from the front end portion of the housing main body 22, and a chuck portion 27 for mounting a tip tool (not shown) such as a driver bit on the tip portion of the output shaft. Is provided.

As shown in FIG. 1, the grip portion 24 of the driver main body 20 includes a grip main body 24m and a battery mounting portion 24b provided on the lower side of the grip main body 24m. A trigger-type shift switch 25 is provided on the front side of the boundary position between the grip body 24 m and the housing body 22 of the grip portion 24. Moreover, the battery mounting part 24b of the grip part 24 is configured such that the battery pack 30 is connected by the battery pack 30 being inserted from the axial direction.
The battery pack 30 is a power source for the driver main body 20, and includes an insertion portion (not shown) that is inserted into the battery mounting portion 24b of the driver main body 20, a decorative lid portion 34 that closes the opening of the battery mounting portion 24b, and a battery. The connection part (illustration omitted) connected with the mounting part 24b, and the connection cancellation | release operation part 36 are comprised.

<About the brush structure of the motor 40>
Next, the outline of the brush structure of the motor 40 that is the drive source of the driver body 20 will be described.
The motor 40 is a motor with a brush as described above, and is coaxially accommodated in the rear part of the housing body 22 as shown in FIG. At the rear of the rotor 43 of the motor 40, a cylindrical commutator 45 is provided coaxially with the rotor 43, and the tips of a pair of carbon brushes 47 are in sliding contact with the commutator 45 from the outside in the radial direction. ing. The carbon brush 47 is formed in a shaft shape, and each carbon brush 47 is attached to the inside of the housing main body 22 in a state where the carbon brush 47 is supported by the brush holder 50. That is, the carbon brushes 47 are arranged on both the left and right sides of the center of the commutator 45 of the motor 40 and are positioned so that the axis of the carbon brushes 47 is orthogonal to the axis of the motor 40. Yes.
The left and right brush holders 50 are formed symmetrically and are fixed inside the housing main body 22. Further, the housing main body portion 22 is provided with a brush replacement opening portion 28 used when the carbon brush 47 is replaced at a position corresponding to the left and right brush holders 50. The brush replacement opening 28 is blocked by the cap 60.

<About the brush holder 50>
As shown in FIG. 3, each brush holder 50 extends from the position of the bearing-shaped holder main body 51 to the vicinity of the commutator 45 of the motor 40 and is coaxial with the holder main body 51. A cylindrical conductor 53 is included.
In the central axis direction of the holder main body 51 of the brush holder 50, as shown in FIG. 4, a central hole including a large diameter hole 51r, a tapered hole 51t, a medium diameter hole 51m, and a small diameter hole 51s is formed in this order from the front side. ing. The proximal end portion of the cylindrical conductor 53 is passed through the central hole of the holder body 51 from the small diameter hole 51s side.
Further, a small diameter portion 511, a stepped portion 512, and a large diameter portion 513 are formed coaxially on the outer peripheral surface of the holder main body 51 in order from the front side, and the female screw 62 of the cap 60 is screwed into the small diameter portion 511. A male screw 511n is formed.

The cylindrical conductor 53 is a part for storing the carbon brush 47, and the inside of the cylindrical conductor 53 is a brush storage hole 53 h for storing the carbon brush 47. Further, the outer diameter dimension of the cylindrical conductor 53 is set to a value substantially equal to the inner diameter dimension of the small diameter hole 51 s of the holder body 51. The cylindrical conductor 53 is formed with a stopper portion 53s that expands radially outward at a central position in the axial direction. The cylindrical conductor 53 is inserted into the central hole of the holder main body 51 from the small diameter hole 51 s of the holder main body 51 until the stopper portion 53 s contacts the back surface of the holder main body 51. A cap-shaped power supply terminal 48 that presses the proximal end of the cylindrical conductor 53 from the outside in the radial direction from the large-diameter hole 51r to the medium-diameter hole 51m is fitted into the center hole of the holder main body 51 from the front side of the holder main body 51. Yes.
Further, the tip side from the center of the cylindrical conductor 53 extends from the position of the holder body 51 to the vicinity of the commutator 45 of the motor 40. The carbon brush 47 housed in the cylindrical conductor 53 protrudes from the tip of the cylindrical conductor 53, and the protruding end of the carbon brush 47 is in contact with the commutator 45 of the motor 40.
Here, on the inner side of the base end portion (the portion inserted into the holder main body 51) of the cylindrical conductor 53, the carbon brush 47 is connected to the commutator 45 side between the power supply terminal 48 and the base end surface of the carbon brush 47. A coil spring 49 urged so as to be pressed is fitted.

<About Brush Replacement Opening 28 of Housing Body 22>
The brush replacement opening 28 of the housing main body 22 is provided on both the left and right sides of the rear portion of the housing main body 22 so as to be coaxial with the brush housing hole 53h of the brush holder 50 (see FIGS. 1 and 2). . Further, the inner diameter dimension of the brush replacement opening 28 is set to be larger than the outer diameter dimension of the holder main body 51 of the brush holder 50 as shown in FIG.
As shown in FIG. 4, the brush replacement opening 28 extends in the axial direction of the brush replacement opening 28 at the periphery of the opening and protrudes inside the housing main body 22. And an inner flange portion 283 that projects inward in the radial direction at the tip position of the shaped portion 281. A surface on the front side of the inner flange portion 283, that is, a surface adjacent to the inner peripheral surface 281w of the cylindrical portion 281 is a tapered concave surface 283t inclined with respect to the inner peripheral surface 281w of the cylindrical portion 281. .
Here, the inner flange portion 283 of the brush replacement opening portion 28 is provided at a position surrounding the small diameter portion 511 of the holder main body 51 of the brush holder 50.

<About the cap 60>
The brush replacement opening 28 of the housing main body 22 has a cap 60 that closes the brush replacement opening 28 and covers the small diameter portion 511 of the holder main body 51 of the brush holder 50 to close the brush housing hole 53h and the like. It is inserted coaxially. As shown in FIG. 4, the cap 60 is formed in a shallow bottomed cylindrical shape, and is configured to cover a small diameter portion 511 formed on the outer peripheral surface of the holder main body 51 of the brush holder 50. That is, a female screw 62 is formed on the inner peripheral surface of the cap 60, and the female screw 62 is configured to be screwable with a male screw 511 n formed on the small diameter portion 511 of the outer peripheral surface of the holder body 51. ing.
Further, as shown in FIG. 4, a square groove 64 having a square cross section is formed in a ring shape on the outer peripheral surface of the cap 60 continuously in the circumferential direction. A ring-shaped water-proof member 66 that seals between the cap 60 and the brush replacement opening 28 is fitted into the square groove 64 of the cap 60.
The immersion preventing member 66 is a rubber O-ring, and the outer diameter is set to a value slightly larger than the inner diameter of the tubular portion 281 of the brush replacement opening 28.
Further, on the surface side of the cap 60, the female screw 62 of the cap 60 is attached to the brush holder 51 in a state where the cap 60 is housed in the brush replacement opening 28 of the housing body 22, as shown in FIG. When screwing into the male screw 511n, for example, a fitting groove 60k configured to be fitted with a tip of a driver or the like is formed.
That is, the cap 60 corresponds to the lid portion of the present invention, and the square groove 64 of the cap 60 corresponds to the concave portion in the lid portion of the present invention.

Next, a procedure for setting the cap 60 in the holder main body 51 of the brush holder 50 and the brush replacement opening 28 will be described.
First, the carbon brush 47 is inserted into the brush housing hole 53 h of the brush holder 50 from the brush replacement opening 28 with the cap 60 removed. Further, the coil spring 49 is inserted into the brush housing hole 53 h and the power supply terminal 48 is fitted into the center hole of the holder main body 51, thereby connecting the power supply terminal 48 to the proximal end portion of the cylindrical conductor 53. Next, the cap 60 is put on the small-diameter portion 511 of the holder main body 51 of the brush holder 50, and the female screw 62 of the cap 60 is screwed into the male screw 511n of the small-diameter portion 511 of the holder main body 51 using a tool such as a screwdriver. Let
When the female screw 62 of the cap 60 is screwed into the male screw 511n of the small diameter portion 511 of the holder main body 51, the cap 60 enters the back side in the axial direction in a state coaxial with the brush replacement opening 28. Thereby, the infiltration member 66 attached to the outer periphery of the cap 60 comes into contact with the tapered concave surface 283t of the inner flange portion 283 of the brush replacement opening 28 over the entire periphery.
Then, by using a tool such as a screwdriver, the female screw 62 of the cap 60 is fastened to the male screw 511n of the small diameter portion 511 of the holder main body 51, whereby the attachment of the cap 60 to the holder main body 51 is completed. As a result, the water-proof member 66 is pressed between the cap 60 and the tapered concave surface 283t of the brush replacement opening 28 from the outside in the axial direction and the radial direction, and sealing between the cap 60 and the brush replacement opening 28 is achieved. . Further, the seal between the cap 60 and the brush housing hole 53h of the brush holder 50 is also achieved.

<Advantages of Rechargeable Electric Driver 10 According to this Embodiment>
According to the rechargeable electric driver 10 according to the present embodiment, the anti-soaking member 66 is provided between the brush replacement opening 28 of the housing main body 22 and the cap 60 (lid portion). However, it is possible to prevent water from entering between the cap 60 and the brush replacement opening 28 while the brush replacement opening 28 is closed.
For this reason, the waterproofness of the brush replacement opening 28 in the housing main body 22 of the electric driver 10 (electrical device) can be improved.
Further, the cap 60 is configured to close the brush replacement opening 28 of the housing body 22 in a state where the brush housing hole 53h of the brush holder 50 is closed. For this reason, the number of parts can be reduced.
In addition, a permeation-proof member 66 is disposed on the outer periphery of the cap 60, and the cap 60 is compact in order to accommodate the cap 60 coaxially in the tubular portion 281 of the brush replacement opening 28 of the housing body 22. Can be. Furthermore, since the cap 60 does not protrude outside the housing body 22, the cap 60 does not get in the way when the electric driver 10 is used.
In addition, the outer peripheral surface of the cap 60 is formed with a square groove 64 (concave portion) into which the anti-soaking member 66 is fitted, so that when the cap 60 is attached to or removed from the brush replacement opening 28 of the housing body 22. In addition, the dipping-proof member 66 does not fall off from the cap 60, and workability is improved.
Further, the inner flange portion 283 has a tapered concave surface 283t on which the infiltration member 66 abuts, so that the infiltration member 66 is simultaneously pressed from the axial direction and the radially outer side, thereby improving the sealing performance. To do.

<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, a square groove 64 is formed on the outer peripheral surface of the cap 60, and a ring-shaped water-proof member 66 is fitted into the square groove 64, so that the brush replacement opening 28 of the housing body 22 is water-proof. The example which forms the taper concave surface 283t with which the member 66 contact | abuts was shown. However, it is also possible to provide the square groove 64 and the ring-shaped water-proof member 66 in the brush replacement opening 28 of the housing body 22 and to form the tapered concave surface 283 t on the outer peripheral surface of the cap 60.
Further, in the present embodiment, the cap 60 and the separate water-proof member 66 are illustrated, but the cap 60 and the water-proof member 66 can also be integrated.
In this embodiment, the example in which the cap 60 and the brush holder 50 are coupled by the screwing action of the male screw 511n and the female screw 62 has been shown. However, screws or the like are used instead of the male screw 511n and the female screw 62. It is also possible to do.
Moreover, in this embodiment, the rechargeable electric driver 10 was illustrated as an example of an electric device. However, the present invention can be applied to a mower, a mower, and the like as an electric device in addition to an electric tool, and the present invention can also be applied to a cleaning device such as a polisher.

10 ... Electric screwdriver (electric equipment)
20... Driver body 22... Housing body 28... Brush replacement opening (opening)
281 ··· Tubular portion 283t ··· Tapered concave surface 283 ··· Inner flange portion 40 ··· Motor 45 ··· Commutator 47 ··· Carbon brush 53h ··· Brush storage hole 60 ... Cap (lid)
64 ... Square groove (recess)
66 ... Dipping-proof member

Claims (6)

A motor with a brush as a drive source is housed in a housing, and the housing is provided with an opening for brush replacement of the motor and a lid for closing the opening,
Between the opening and the lid of the housing, there is provided an immersion preventing member that prevents water from entering between the lid and the opening while the lid closes the opening. Electrical equipment characterized by The electrical device according to claim 1,
Inside the opening of the housing, a brush holder having a brush housing hole formed coaxially with the opening is provided in a state supported by the housing,
The electric device according to claim 1, wherein the lid portion is configured to close the opening portion of the housing in a state in which a brush housing hole of the brush holder housing the shaft-shaped brush is closed. An electrical device according to claim 1 or claim 2,
The opening of the housing extends in the axial direction of the opening at the peripheral position of the opening, and protrudes inward of the housing, and radially inward at the tip end in the axial direction of the cylindrical portion. With an inner flange part
The lid is configured to be coaxially housed in the cylindrical portion of the opening, and the water-proof member is disposed on the outer periphery of the lid.
The lid is accommodated coaxially in the cylindrical portion of the opening, and the seal member is in contact with the inner flange over the entire circumference, whereby a seal between the opening and the lid is shown. An electric device characterized by being configured. An electrical device according to claim 3,
The lid portion is formed in a cap shape that covers the brush holder, and is configured to be fixed to the brush holder by the action of a screw.
An electrical apparatus configured to be configured such that when the screw is tightened, a water-proof member disposed on an outer periphery of the lid portion is pressed against an inner flange portion of the opening of the housing. An electrical device according to claim 3 or claim 4,
An electric device, wherein a concave portion into which the water-proof member is fitted is formed on the outer peripheral surface of the lid portion. An electrical device according to any one of claims 3 to 5,
The electric device according to claim 1, wherein the inner flange portion is formed such that a surface on which the infiltration member contacts is a tapered concave surface.

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