JP2007136607A - Power tool - Google Patents

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Publication number
JP2007136607A
JP2007136607A JP2005333286A JP2005333286A JP2007136607A JP 2007136607 A JP2007136607 A JP 2007136607A JP 2005333286 A JP2005333286 A JP 2005333286A JP 2005333286 A JP2005333286 A JP 2005333286A JP 2007136607 A JP2007136607 A JP 2007136607A
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Prior art keywords
housing
motor
brush
brush holder
heat radiating
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JP2005333286A
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JP4631663B2 (en
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Fumiaki Sekino
文昭 関野
Naotake Tanaka
尚武 田中
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Panasonic Electric Works Co Ltd
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Matsushita Electric Works Ltd
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Priority to JP2005333286A priority Critical patent/JP4631663B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/008—Cooling means

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)
  • Motor Or Generator Frames (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact power tool, having superior usability and reducing the total length of a housing by disposing a brush motor and a motor control electronic parts, in the direction orthogonal to the longitudinal direction of the housing. <P>SOLUTION: In this power tool, a built-in brush motor 2 mounted internally in a housing 1 is constructed by arraying a magnetic field part and a rectifying part 22 in the longitudinal direction E, F of the housing 1; the rectifying part 22 is provided with a plate-like brush holder 7 for positioning a brush 5; the end part away from the positioning part for the brush 5 in the brush holder 7 is cutout into a D-shape; a new space part 26 is formed, in a direction orthogonal to the longitudinal direction E, F of the housing 1 between the D-cut end part of the brush holder 7 and the inner surface of the housing 1; and the motor control electronic component 14 is disposed in the new space part 26. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、例えば、穴あけ作業や切断作業等に用いられる手持ち式電動工具に関し、詳しくはハウジング内に内装されるモータが、モータケースを省略したビルトイン式ブラシモータである電動工具に関するものである。   The present invention relates to a hand-held electric tool used for, for example, a drilling operation or a cutting operation, and more particularly to an electric tool in which a motor built in a housing is a built-in brush motor in which a motor case is omitted.

従来から、電車工具の軽量化のためにモータケースを排除して、モータの構成要素をハウジングに直接組み付けるビルトイン式ブラシモータが知られている（例えば、特許文献１参照）。   Conventionally, a built-in brush motor in which a motor case is eliminated to reduce the weight of a train tool and a motor component is directly assembled to a housing is known (for example, see Patent Document 1).

従来のモータ２は、図６、図７に示すように、ロータ３ａ及び界磁磁石３ｂから成る界磁部３と、ブラシ５及び整流子８から成る整流部２２とを別体にしたブラシモータで構成されており、整流部２２をハウジング１の本体部１ａの基端側Ｆに配置すると共に界磁部３を本体部１ａの先端側Ｅに配置している。なお図６中の９は充電式電池、２１はチャックである。ここで、整流部２２にはブラシ５の位置決めを行う円形状のブラシホルダ７が備えられているが、このブラシホルダ７の端縁部分をハウジング１に形成された１対の突起２５によって扶持させることで、ブラシホルダ７をハウジング１に保持している。またハウジング１は内装品を収納するために２つ割りになっており、内装品を組み込んだあとにこれらをねじ止めするが、ねじ止めのためハウジング１に形成されるボス状のねじ止め部のうち、従来では本体部１ａの後部における上下のねじ止め部１１，１２を円形状のブラシホルダ７と干渉しないようにブラシホルダ７よりも後ろ側（基端側Ｆ）に張り出して配設しなければならず、そのためにハウジング１の本体部１ａの全長が長くなってしまうという問題があった。   As shown in FIGS. 6 and 7, the conventional motor 2 is a brush motor in which a field unit 3 composed of a rotor 3 a and a field magnet 3 b and a rectification unit 22 composed of a brush 5 and a commutator 8 are separated. The rectifying unit 22 is disposed on the base end side F of the main body 1a of the housing 1 and the field unit 3 is disposed on the front end E of the main body 1a. In FIG. 6, 9 is a rechargeable battery and 21 is a chuck. Here, the rectifying unit 22 is provided with a circular brush holder 7 for positioning the brush 5, and the edge portion of the brush holder 7 is held by a pair of protrusions 25 formed on the housing 1. Thus, the brush holder 7 is held in the housing 1. Further, the housing 1 is divided into two parts for accommodating the interior parts, and these are screwed after the interior parts are assembled. The boss-like screwing part formed on the housing 1 is used for screwing. Among them, conventionally, the upper and lower screwing portions 11 and 12 at the rear portion of the main body portion 1 a should be arranged so as to protrude rearward (base end side F) from the brush holder 7 so as not to interfere with the circular brush holder 7. For this reason, there has been a problem that the entire length of the main body 1a of the housing 1 becomes long.

他の従来例を図８に示す。この従来例では上記図６、図７のモータ２と同様の構成をとりつつ、モータ２の後方にモータ制御用のＦＥＴ１４ａ（電界効果トランジスタ）とＦＥＴ１４ａの熱を逃がすための放熱板１３とを配置したものであり、この場合も、ハウジング１の本体部１ａの全長が長くなってしまうという問題がある。   Another conventional example is shown in FIG. In this conventional example, a motor control FET 14a (field effect transistor) and a heat dissipation plate 13 for releasing the heat of the FET 14a are arranged behind the motor 2 while adopting the same configuration as the motor 2 of FIGS. In this case as well, there is a problem that the entire length of the main body 1a of the housing 1 becomes long.

さらに他の従来例を図９、図１０に示す。なお図中の１５はベアリング、１７はＦＥＴリード線、１８はモータリード線である。この電動工具３０のブラシホルダ７においても図１０のように円形状をしており、そのうえ図９のようにＦＥＴ１４ａと放熱板１３とがブラシホルダ７の後方（基端側Ｆ）に配置されているため、ハウジング１の本体部１ａの全長が長くなってしまうという問題がある。なお、全長を短くするためにＦＥＴ１４ａと放熱板１３をグリップ部１ｂのスイッチケースに配設しているものもあるが、この場合、放熱板１３を通る風の流れがなく、グリップ部１ｂが熱くなるという別の問題が生じる。
特開２００３−０２５２５５号公報 Still another conventional example is shown in FIGS. In the figure, 15 is a bearing, 17 is an FET lead, and 18 is a motor lead. The brush holder 7 of the electric power tool 30 is also circular as shown in FIG. 10, and the FET 14 a and the heat radiating plate 13 are arranged behind the brush holder 7 (base end side F) as shown in FIG. 9. Therefore, there exists a problem that the full length of the main-body part 1a of the housing 1 will become long. In some cases, the FET 14a and the heat radiating plate 13 are disposed in the switch case of the grip portion 1b in order to shorten the overall length. In this case, there is no flow of wind through the heat radiating plate 13, and the grip portion 1b is hot. Another problem arises.
JP 2003-025255 A

本発明は上記の従来の問題点に鑑みて発明したものであって、ブラシホルダとモータ制御用の電子部品とをハウジングの長さ方向と直交する方向にコンパクトに配設可能とし、これによりハウジングの全長を短くでき、小型で且つ使用性に優れた電動工具を提供することを課題とするものである。   The present invention has been invented in view of the above-described conventional problems, and allows the brush holder and the electronic component for motor control to be disposed compactly in a direction perpendicular to the length direction of the housing, whereby the housing It is an object of the present invention to provide a power tool that can shorten the overall length, is small, and has excellent usability.

前記課題を解決するために本発明は、ハウジング１に内装されるモータ２が、モータケースを省略したビルトイン式ブラシモータである電動工具において、上記モータ２は、ロータ及び界磁磁石から成る界磁部３と、ブラシ５及び整流子８から成る整流部２２とが別体に構成されてハウジング１の長さ方向Ｅ，Ｆに配列されており、上記整流部２２にブラシ５を位置決めする板状のブラシホルダ７を設けると共に、ブラシホルダ７におけるブラシ５の位置決め部分から離れた端部をＤカット状に切欠することで、ブラシホルダ７のＤカットされた端部とハウジング１内面との間に、ハウジング１の長さ方向Ｅ，Ｆと直交する方向に新規空間部２６を形成し、該新規空間部２６にモータ制御用の電子部品１４を配設したことを特徴としている。   In order to solve the above-described problems, the present invention provides a power tool in which the motor 2 housed in the housing 1 is a built-in brush motor in which the motor case is omitted. The motor 2 includes a field magnet including a rotor and a field magnet. The plate 3 for positioning the brush 5 on the rectifying unit 22 is configured separately from the rectifying unit 22 composed of the brush 3 and the commutator 8 and arranged in the length direction E, F of the housing 1. The brush holder 7 is provided, and the end of the brush holder 7 away from the positioning portion of the brush 5 is cut into a D-cut shape so that the D-cut end of the brush holder 7 and the inner surface of the housing 1 are interposed. A new space portion 26 is formed in a direction orthogonal to the length directions E and F of the housing 1, and the motor control electronic component 14 is disposed in the new space portion 26.

このような構成とすることで、ブラシホルダ７のＤカット状に切欠された端部とハウジング１内面との間に、ハウジング１の長さ方向Ｅ，Ｆと直交する方向に新たな新規空間部２６を生じさせることができ、この新規空間部２６を利用してモータ制御用の電子部品１４を収納できるので、ブラシホルダ７とモータ制御用の電子部品１４とをハウジング１の長さ方向Ｅ，Ｆと直交する方向にコンパクトに配設できるようになる。しかもブラシ５の位置決め部分から離れた端部をＤカットするので、ブラシホルダ７によるブラシ５の位置決め機能が従来通り発揮されると共に、モータ制御用の電子部品１４を従来のようにグリップ部１ｂ側に配設する必要もなくなる。   By adopting such a configuration, a new new space portion is formed in a direction orthogonal to the length directions E and F of the housing 1 between the end portion of the brush holder 7 cut into a D-cut shape and the inner surface of the housing 1. 26, and the motor control electronic component 14 can be accommodated using the new space 26, so that the brush holder 7 and the motor control electronic component 14 are connected in the longitudinal direction E, It becomes possible to arrange compactly in the direction orthogonal to F. In addition, since the end of the brush 5 away from the positioning portion is D-cut, the positioning function of the brush 5 by the brush holder 7 is exhibited as before, and the motor control electronic component 14 is mounted on the grip portion 1b side as in the prior art. There is no need to dispose it.

また、上記ハウジング１内部に、モータ２により回転する通風ファン４と、モータ制御用の電子部品１４の熱を逃がすための放熱板１３とを収納すると共に、ハウジング１における放熱板１３の近傍位置に外気を導入する吸気口１９を形成するのが好ましく、この場合、電子部品１４又は放熱板１３を通風ファン４による冷却風の通路に配置することができるので、電子部品１４の冷却効果を高めることができ、電子部品１４がモータ２の発熱の影響を受けにくくなる。   The housing 1 houses a ventilation fan 4 that is rotated by the motor 2 and a heat radiating plate 13 for releasing heat from the motor control electronic component 14, and is located near the heat radiating plate 13 in the housing 1. It is preferable to form an air inlet 19 for introducing outside air. In this case, the electronic component 14 or the heat radiating plate 13 can be disposed in the passage of the cooling air by the ventilation fan 4, so that the cooling effect of the electronic component 14 is enhanced. Thus, the electronic component 14 is less susceptible to the heat generated by the motor 2.

また、上記ハウジング１における通風ファン４の近傍位置に排気口２０を設け、通風ファン４と放熱板１３とを仕切るリブ２３に吸気口１９から排気口２０まで通風するための通風孔２３ａを設けるのが好ましく、この場合、通風孔２３ａを通して放熱板１３からの排気口２０への放熱が良好となり、放熱板１３の体積を小さくできて、軽量化を図ることができる。   Further, an exhaust port 20 is provided in the housing 1 in the vicinity of the ventilation fan 4, and a ventilation hole 23 a for ventilating the ventilation fan 4 and the heat radiating plate 13 from the intake port 19 to the exhaust port 20 is provided in the rib 23. In this case, heat radiation from the heat radiating plate 13 to the exhaust port 20 becomes good through the ventilation holes 23a, the volume of the heat radiating plate 13 can be reduced, and the weight can be reduced.

また、上記ブラシホルダ７の下端部７ａをＤカット状に形成すると共に、ブラシホルダ７の下方に生じる新規空間部２６に、一対の半割れハウジング１ｃ，１ｄの下部同士を互いに固定するための下側ねじ止め部１２を配設するのが好ましく、また、上記ブラシホルダ７の上端部７ｂ近傍位置に、一対の半割れハウジング１ｃ，１ｄの上部同士を互いに固定するための上側ねじ止め部１１を配設するのが好ましく、この場合、上下のねじ止め部１１，１２をブラシホルダ７の後ろに張り出して配置する必要がなくなり、ハウジング１の全長をより一層短くできる。   Further, the lower end portion 7a of the brush holder 7 is formed in a D-cut shape, and a lower portion for fixing the lower portions of the pair of half-cracked housings 1c and 1d to each other in a new space portion 26 formed below the brush holder 7. A side screwing portion 12 is preferably provided, and an upper screwing portion 11 for fixing the upper portions of the pair of half-cracked housings 1c and 1d to each other is provided near the upper end portion 7b of the brush holder 7. In this case, it is not necessary to place the upper and lower screwing portions 11 and 12 so as to protrude behind the brush holder 7, and the overall length of the housing 1 can be further shortened.

また、上記放熱板１３に、モータ２の駆動軸を回転自在に軸支するベアリング１５を接触させるのが好ましく、この場合、電子部品１４の冷却のための放熱板１３を利用して、ベアリング１５の熱を除去でき、ベアリング１５の長寿命化を図ることができる。   In addition, it is preferable to contact the heat sink 13 with a bearing 15 that rotatably supports the drive shaft of the motor 2. In this case, the heat sink 13 for cooling the electronic component 14 is used to make the bearing 15. Thus, the life of the bearing 15 can be extended.

本発明は、ブラシホルダの端部をＤカット状に切欠して新規空間部を形成し、この新規空間部にモータ制御用の電子部品を配設することにより、ブラシホルダとモータ制御用の電子部品とをハウジングの長さ方向と直交する方向にコンパクトに配設でき、これによりハウジングの全長を短くできるものであり、また、ブラシホルダのＤカット位置をブラシの位置決め部分から離れた端部に設定することで、ブラシホルダによるブラシの位置決め機能が従来通り発揮されるものであり、さらに、モータ制御用の電子部品を従来のようにグリップ部側に配設する必要もないため、グリップ部が熱くなることもなくなり、結果、小型で且つ使用性に優れた電動工具が得られるものである。   In the present invention, the end of the brush holder is cut out in a D-cut shape to form a new space portion, and the motor control electronic components are disposed in the new space portion. The parts can be arranged compactly in the direction perpendicular to the length direction of the housing, and the overall length of the housing can be shortened, and the D-cut position of the brush holder is placed at the end portion away from the positioning portion of the brush. By setting, the positioning function of the brush by the brush holder is exhibited as usual, and furthermore, it is not necessary to arrange the motor control electronic parts on the grip part side as in the conventional case. As a result, the electric tool which is small and excellent in usability can be obtained.

以下、本発明を添付図面に示す実施形態に基いて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

図１乃至図４は本発明の一実施形態の電動工具３０を示す。この電動工具３０のハウジング１は、図２、図３に示すように、水平円筒状の本体部１ａと、この本体部１ａの下縁から下方に垂下するグリップ部１ｂとを備え、ハウジング１の本体部１ａにその先端側Ｅから基端側Ｆに向かって、チャック２１、図示しない駆動部、モータ２を内装している。ハウジング１のグリップ部１ｂには電動駆動するモータ２の通電をオンオフをするスイッチ（図示せず）を内装し、グリップ部１ｂの下端には充電式電池９が着脱自在に設けられている。ここで、チャック２１にはドリルやドライバー等の工具を装着させるチャック２１が備えられ、駆動部はモータ２の回転駆動をチャック２１に伝達させる減速機構で構成され、モータ２は電動式であり、スイッチを介して充電式電池９との電気的接続がなされている。また、上記ハウジング１に内装される内装品はハウジング１の内部空間を区切るようにハウジング１内面に形成されたリブ等で適所に位置決めされて内装されている。なお、上記モータ２の通電をオンオフをするスイッチはハウジング１の本体部１ａとグリップ部１ｂとの連結部分に設けたトリガー１６により操作されるようになっている。   1 to 4 show a power tool 30 according to an embodiment of the present invention. As shown in FIGS. 2 and 3, the housing 1 of the electric tool 30 includes a horizontal cylindrical main body 1 a and a grip 1 b that hangs downward from the lower edge of the main body 1 a. A chuck 21, a drive unit (not shown), and a motor 2 are housed in the main body 1 a from the distal end E toward the proximal end F. The grip portion 1b of the housing 1 is provided with a switch (not shown) for turning on and off energization of the motor 2 that is electrically driven, and a rechargeable battery 9 is detachably provided at the lower end of the grip portion 1b. Here, the chuck 21 is provided with a chuck 21 on which a tool such as a drill or a screwdriver is mounted, and the drive unit is constituted by a speed reduction mechanism that transmits the rotational drive of the motor 2 to the chuck 21, and the motor 2 is an electric type. Electrical connection with the rechargeable battery 9 is made through a switch. In addition, the interior product housed in the housing 1 is positioned at a suitable position by a rib or the like formed on the inner surface of the housing 1 so as to divide the internal space of the housing 1. The switch for turning on / off the energization of the motor 2 is operated by a trigger 16 provided at a connecting portion between the main body 1a and the grip 1b of the housing 1.

ここで、上記モータ２は、モータケースを省略してモータ２の構成要素をハウジング１に内装したビルトイン式ブラシモータであり、ロータ３ａ及び界磁磁石３ｂ（図７）から成る界磁部３と、ブラシ５及び整流子８から成る整流部２２とが別体に構成されると共に、界磁部３と整流部２２とがハウジング１の長さ方向Ｅ，Ｆに配列されている。本例では整流部２２をハウジング１の本体部１ａの基端側Ｆに配置し、界磁部３を本体部１ａの先端側Ｅに配置している。   Here, the motor 2 is a built-in brush motor in which the motor case is omitted and the components of the motor 2 are housed in the housing 1, and the field unit 3 including the rotor 3a and the field magnet 3b (FIG. 7) and The rectifying unit 22 including the brush 5 and the commutator 8 is configured separately, and the field magnet unit 3 and the rectifying unit 22 are arranged in the length directions E and F of the housing 1. In this example, the rectifying unit 22 is disposed on the base end side F of the main body 1a of the housing 1, and the field unit 3 is disposed on the front end E of the main body 1a.

上記ブラシ５は、絶縁板からなるブラシホルダ７に設けたブラシケース６に挿入されている。図１に示す例では、一対のブラシケース６をブラシホルダ７の上半部において上向きＶ字形に配設しており、ブラシホルダ７の下端部７ａをＤカット状に形成して、ブラシホルダ７の外郭形状を従来の円形状からＤ形状に変更させている。このブラシホルダ７の上端部７ｂ側の端縁部分はハウジング１に形成された１対の突起２５（図４）によって扶持されている。またブラシホルダ７の端部をＤカットすることにより、ブラシホルダ７のＤカットされた端部とハウジング１内面との間に、ハウジング１の長さ方向Ｅ，Ｆと直交する方向に新規空間部２６が新たに生じ、この新規空間部２６にモータ制御用の電子部品１４が配設されている。ここでは、ブラシホルダ７の下端部７ａとハウジング１の本体部１ａの内周面との間に生じた新たな新規空間部２６内に納まるように、ＦＥＴ１４ａ（電界効果トランジスタ）及びこのＦＥＴ１４ａで発生した熱を取り除くための放熱板１３とがそれぞれ配設されている。なお、ＦＥＴ１４ａはモータ２の電流を制御する半導体スイッチング素子の一種で、ＦＥＴリード線１７を介して他のスイッチ部品と電気的につながっており、充電式電池９からモータ２に流れる電流を調節し、トリガー１６の引き込み量に応じてモータ２の回転遠度を調節するものである。勿論、モータ制御用の電子部品１４としてＦＥＴ１４ａに限定されるものではなく、モータ２の回転数制御を行なうスイッチング素子を広く含むものである。   The brush 5 is inserted into a brush case 6 provided in a brush holder 7 made of an insulating plate. In the example shown in FIG. 1, a pair of brush cases 6 are arranged in an upward V shape in the upper half of the brush holder 7, and the lower end portion 7 a of the brush holder 7 is formed in a D-cut shape. The outer shape is changed from a conventional circular shape to a D shape. The edge portion of the brush holder 7 on the upper end 7 b side is held by a pair of protrusions 25 (FIG. 4) formed on the housing 1. Further, by cutting the end portion of the brush holder 7 by D-cutting, a new space portion is formed in a direction orthogonal to the length directions E and F of the housing 1 between the D-cut end portion of the brush holder 7 and the inner surface of the housing 1. 26 is newly generated, and the electronic component 14 for motor control is disposed in the new space portion 26. Here, the FET 14a (field effect transistor) and the FET 14a are generated so as to be accommodated in a new new space 26 formed between the lower end 7a of the brush holder 7 and the inner peripheral surface of the main body 1a of the housing 1. A heat radiating plate 13 for removing the generated heat is provided. The FET 14a is a kind of semiconductor switching element that controls the current of the motor 2 and is electrically connected to other switch components via the FET lead wire 17 to adjust the current flowing from the rechargeable battery 9 to the motor 2. The rotational distance of the motor 2 is adjusted according to the pull-in amount of the trigger 16. Of course, the electronic component 14 for controlling the motor is not limited to the FET 14a, but includes a wide range of switching elements for controlling the rotational speed of the motor 2.

また上記モータ２の回転部（例えば駆動軸或いはロータ）に通風ファン４が取り付けられており、一方、ハウジング１における通風ファン４の外周位置に排気用の風穴である排気口２０が形成されており、他の部分に吸気用の風穴である吸気口１９（１９ａ〜１９ｃ）が形成されている。そして、図４に示すように、吸気口１９から外部の空気Ｍを吸い込み、経路にある部品（ＦＥＴ１４ａ、放熱板１３等）の熱を取り除いて排気口２０から加熱された空気Ｎを排出するようにしている。本例では、ハウジング１には通風ファン４の後方を仕切るリブ２３が突設されており、吸気口１９ａ，１９ｂより吸い込んだ空気Ｍがリブ２３に設けた円形の通風孔２３ａを通って排気口２０へと向かうようにしている。ここで、放熱板１３はフィン形状をしており、ハウジング１の吸気口１９ａは放熱板１３の外周部分に面して開口しており、吸気口１９ａから吸い込んだ空気Ｍが放熱板１３のフィン間の凹部１３ａを通って、ＦＥＴ１４ａの発熱を効率よく除去できるようになっている。   A ventilation fan 4 is attached to the rotating portion (for example, drive shaft or rotor) of the motor 2, while an exhaust port 20, which is an exhaust air hole, is formed at the outer peripheral position of the ventilation fan 4 in the housing 1. In other portions, intake ports 19 (19a to 19c), which are air holes for intake, are formed. Then, as shown in FIG. 4, external air M is sucked from the intake port 19, heat of components (FET 14 a, heat sink 13, etc.) in the path is removed, and heated air N is discharged from the exhaust port 20. I have to. In this example, a rib 23 that partitions the rear of the ventilation fan 4 protrudes from the housing 1, and the air M sucked from the intake ports 19 a and 19 b passes through the circular ventilation holes 23 a provided in the ribs 23 to the exhaust port. I am heading to 20. Here, the heat radiating plate 13 has a fin shape, the air inlet 19a of the housing 1 is opened facing the outer peripheral portion of the heat radiating plate 13, and the air M sucked from the air inlet 19a is the fin of the heat radiating plate 13. The heat generation of the FET 14a can be efficiently removed through the recess 13a.

上記ハウジング１は、内装品を収納するために一対の半割れハウジング１ｃ，１ｄ（図４）からなり、部品を組み込んだあとにこれらをねじ止めするため、半割れハウジング１ｃ，１ｄには複数のボス形状をしたねじ止め部１１，１２が突設されている。これらのねじ止め部１１，１２のうち、従来はブラシホルダ７よりも後方にあった下側のねじ止め部１２（図６）を、本発明では図３に示すブラシホルダ７及び放熱板１３の下方に配設しており、また従来はブラシホルダ７の後方にあった上側のねじ止め部１１（図６）を、本発明ではブラシホルダ７の上端部７ｂの近傍位置（例えば上端部７ｂの前方側）に配設している。   The housing 1 is composed of a pair of half-cracked housings 1c and 1d (FIG. 4) for housing the interior parts, and a plurality of half-cracked housings 1c and 1d have a plurality of half-cracked housings 1c and 1d. Boss-shaped screwing portions 11 and 12 are projected. Of these screwing portions 11 and 12, the lower screwing portion 12 (FIG. 6) that is conventionally rearward of the brush holder 7 is replaced with the brush holder 7 and the heat radiating plate 13 shown in FIG. 3 in the present invention. In the present invention, the upper screwing portion 11 (FIG. 6), which is disposed below and located behind the brush holder 7 in the past, is positioned near the upper end portion 7b of the brush holder 7 (for example, the upper end portion 7b). It is arranged on the front side.

しかして、ブラシホルダ７のＤカット状に切欠された下端部７ａとハウジング１内面との間に、ハウジング１の長さ方向Ｅ，Ｆと直交する方向に新たな新規空間部２６を生じさせたものであり、この新規空間部２６はモータ２の外径範囲内にあり、この新規空間部２６内にモータ制御用のＦＥＴ１４ａ及びその熱を逃がすための放熱板１３を収納することで、ブラシホルダ７とＦＥＴ１４ａと放熱板１３とをハウジング１の長さ方向Ｅ，Ｆと直交する方向にコンパクトに配設できるので、ハウジング１の本体部１ａの全長を短くできる。しかも、ブラシ５の位置決め部分から離れた端部をＤカットするので、ブラシホルダ７によるブラシ５の位置決め機能が従来通り発揮されると共に、ＦＥＴ１４ａを従来のようにグリップ部１ｂ側に配設する必要もなくなるため、グリップ部１ｂが熱くなることもなく、使い勝手が向上する利点がある。   Thus, a new new space 26 is formed in the direction perpendicular to the length directions E and F of the housing 1 between the lower end 7a of the brush holder 7 cut into a D-cut shape and the inner surface of the housing 1. The new space portion 26 is within the outer diameter range of the motor 2, and the brush holder is obtained by housing the FET 14a for motor control and the heat radiating plate 13 for releasing the heat in the new space portion 26. 7, the FET 14 a, and the heat radiating plate 13 can be compactly arranged in the direction orthogonal to the length directions E and F of the housing 1, so that the overall length of the main body 1 a of the housing 1 can be shortened. In addition, since the end of the brush 5 away from the positioning portion is D-cut, the positioning function of the brush 5 by the brush holder 7 is exhibited as before, and the FET 14a needs to be disposed on the grip portion 1b side as in the prior art. Therefore, there is an advantage that the grip portion 1b is not heated and the usability is improved.

また本例では、ハウジング１における通風ファン４の近傍位置に排気口２０を設け、通風ファン４と放熱板１３とを仕切るリブ２３に吸気口１９から排気口２０まで通風するための通風孔２３ａを設けているので、放熱板１３から排気口２０の放熱が一層良くなるのに伴い放熱板１３の体積を小さく抑えることができ、コンパクト化に寄与できる。そのうえブラシホルダ７の下方に生じる新規空間部２６に、一対の半割れハウジング１ｃ，１ｄの下部同士を互いに固定するための下側ねじ止め部１２を配設し、且つブラシホルダ７の上端部７ｂ近傍位置に、半割れハウジング１ｃ，１ｄの上部同士を互いに固定するための上側ねじ止め部１１を配設したことで、従来のように上下のねじ止めボスをブラシホルダ７の後ろにそれぞれ張り出して配置する場合と比較して、ハウジング１の本体部１ａの全長を、より一層短くできる利点がある。   Further, in this example, an exhaust port 20 is provided in the housing 1 in the vicinity of the ventilation fan 4, and a ventilation hole 23 a for ventilating the ventilation fan 4 and the heat radiating plate 13 from the intake port 19 to the exhaust port 20 is provided in the rib 23. Since it is provided, as the heat radiation from the heat radiating plate 13 to the exhaust port 20 is further improved, the volume of the heat radiating plate 13 can be kept small, which contributes to downsizing. In addition, a lower screwing portion 12 for fixing the lower portions of the pair of half-cracked housings 1c and 1d to each other is disposed in a new space portion 26 formed below the brush holder 7, and the upper end portion 7b of the brush holder 7 is disposed. Since the upper screwing portions 11 for fixing the upper portions of the half-cracked housings 1c and 1d to each other are disposed in the vicinity, the upper and lower screwing bosses are projected behind the brush holder 7 as in the prior art. Compared with the case where it arrange | positions, there exists an advantage which can further shorten the full length of the main-body part 1a of the housing 1 further.

さらに本例では、モータ２の回転部に通風ファン４を取り付け、ＦＥＴ１４ａに熱を逃がすためのフィン状の放熱板１３を取り付け、ハウジング１における放熱板１３の近傍位置に吸気口１９を設けたことにより、ＦＥＴ１４ａ又は放熱板１３を通風ファン４による冷却風の通路内に配置でき、ＦＥＴ１４ａの冷却効果を高めることができるので、ＦＥＴ１４ａがモータ２の発熱の影響を受けにくくなり、ＦＥＴ１４ａの寿命を延ばすことができる利点もある。   Further, in this example, the ventilation fan 4 is attached to the rotating part of the motor 2, the fin-like heat radiation plate 13 for releasing heat is attached to the FET 14a, and the air inlet 19 is provided in the housing 1 in the vicinity of the heat radiation plate 13. Thus, the FET 14a or the heat radiating plate 13 can be arranged in the passage of the cooling air by the ventilation fan 4, and the cooling effect of the FET 14a can be enhanced. There are also advantages that can be made.

本発明の他の実施形態として、図５に示すように、ハウジング１の内面に、モータ２の駆動軸を回転自在に軸支するベアリング１５を設けると共に、ＦＥＴ１４ａの放熱板１３の端面部分１３ａをベアリング１５の外輪と接触させるのが望ましい。他の構成は図３と同様である。本例ではベアリング１５の発熱をＦＥＴ１４ａの熱を逃がすための放熱板１３を利用して除去できるので、ベアリング１５の寿命を大幅に延ばすことができる利点がある。   As another embodiment of the present invention, as shown in FIG. 5, a bearing 15 that rotatably supports the drive shaft of the motor 2 is provided on the inner surface of the housing 1, and an end surface portion 13a of the heat sink 13 of the FET 14a is provided. It is desirable to contact the outer ring of the bearing 15. Other configurations are the same as those in FIG. In this example, since the heat generated in the bearing 15 can be removed by using the heat radiating plate 13 for releasing the heat of the FET 14a, there is an advantage that the life of the bearing 15 can be greatly extended.

なお前記実施形態では、ブラシホルダ７のＤカット状に形成する位置をブラシホルダ７の下端部７ａに設定したが、これに限らず、例えばブラシホルダ７の側端或いは上端部７ｂをＤカット状に形成してもよいものである。   In addition, in the said embodiment, although the position formed in D cut shape of the brush holder 7 was set to the lower end part 7a of the brush holder 7, not only this but the side edge or upper end part 7b of the brush holder 7 is D cut shape, for example May be formed.

本発明の一実施形態に用いるＤカット状のブラシホルダを示し、図３のＡ―Ａ線及び図５のＢ―Ｂ線に沿う断面図である。FIG. 6 is a cross-sectional view taken along the line AA in FIG. 3 and the line BB in FIG. 5, showing a D-cut brush holder used in an embodiment of the present invention. 同上のモータがハウジングに内装された電動工具の側面図である。It is a side view of the electric tool by which the motor same as the above was built in the housing. 同上の電動工具を一部破断した側面図である。It is the side view which fractured partially the electric tool same as the above. 同上のモータ付近の一部破断した斜視図である。It is the perspective view which fractured | ruptured the vicinity of the motor vicinity same as the above. 本発明の他の実施形態の一部破断した側面図である。It is the side view which fractured | ruptured partially of other embodiment of this invention. 従来例の電動工具の内部構造の説明図である。It is explanatory drawing of the internal structure of the electric tool of a prior art example. 従来例のモータの内部構造の説明である。It is description of the internal structure of the motor of a prior art example. 他の従来例の電動工具の内部構造の説明図である。It is explanatory drawing of the internal structure of the electric tool of another prior art example. 更に他の従来例の電動工具の内部構造の説明図である。It is explanatory drawing of the internal structure of the electric tool of another prior art example. 従来の円形状のブラシホルダを示し、図９のＣ―Ｃ線に沿う断面図である。It is sectional drawing which shows the conventional circular brush holder and follows CC line of FIG.

符号の説明Explanation of symbols

１ ハウジング
１ａ 本体部
１ｃ，１ｄ 半割れハウジング
２ モータ
３ 界磁部
４ 通風ファン
５ ブラシ
７ ブラシホルダ
７ａ 下端部
８ 整流子
１１，１２ ねじ止め部
１３ 放熱板
１４ 電子部品
１５ ベアリング
１９ 吸気口
２０ 排気口
２２ 整流部
２３ リブ
２３ａ 通風孔
２６ 新規空間部 DESCRIPTION OF SYMBOLS 1 Housing 1a Body part 1c, 1d Half-splitting housing 2 Motor 3 Field magnet part 4 Ventilation fan 5 Brush 7 Brush holder 7a Lower end part 8 Commutator 11, 12 Screwing part 13 Heat sink 14 Electronic component 15 Bearing 19 Inlet 20 Exhaust Port 22 Rectifier 23 Rib 23a Ventilation hole 26 New space

Claims (6)

ハウジングに内装されるモータが、モータケースを省略したビルトイン式ブラシモータである電動工具において、上記モータは、ロータ及び界磁磁石から成る界磁部と、ブラシ及び整流子から成る整流部とが別体に構成されてハウジングの長さ方向に配列されており、上記整流部にブラシを位置決めする板状のブラシホルダを設けると共に、ブラシホルダにおけるブラシの位置決め部分から離れた端部をＤカット状に切欠することで、ブラシホルダのＤカットされた端部とハウジング内面との間に、ハウジングの長さ方向と直交する方向に新規空間部を形成し、該新規空間部にモータ制御用の電子部品を配設してなることを特徴とする電動工具。   In the electric tool in which the motor incorporated in the housing is a built-in brush motor in which the motor case is omitted, the motor includes a field portion composed of a rotor and a field magnet and a rectification portion composed of a brush and a commutator. A plate-shaped brush holder for positioning the brush is provided in the rectifying portion, and an end portion of the brush holder away from the brush positioning portion is formed in a D-cut shape. By forming the notch, a new space is formed in the direction perpendicular to the length direction of the housing between the D-cut end of the brush holder and the inner surface of the housing, and an electronic component for motor control in the new space An electric tool characterized by comprising: 上記ハウジング内部に、モータにより回転する通風ファンと、モータ制御用の電子部品の熱を逃がすための放熱板とを収納すると共に、ハウジングにおける放熱板の近傍位置に外気を導入する吸気口を形成したことを特徴とする請求項１記載の電動工具。   Inside the housing, a ventilation fan rotated by a motor and a heat radiating plate for releasing heat of electronic components for motor control were housed, and an air inlet for introducing outside air was formed at a position near the heat radiating plate in the housing. The power tool according to claim 1. 上記ハウジングにおける通風ファンの近傍位置に排気口を設け、通風ファンと放熱板とを仕切るリブに吸気口から排気口まで通風するための通風孔を設けたことを特徴とする請求項２記載の電動工具。   3. The electric motor according to claim 2, wherein an exhaust port is provided near the ventilation fan in the housing, and a ventilation hole for ventilating from the intake port to the exhaust port is provided in a rib partitioning the ventilation fan and the heat radiating plate. tool. 上記ブラシホルダの下端部をＤカット状に形成すると共に、ブラシホルダの下方に生じる新規空間部に、一対の半割れハウジングの下部同士を互いに固定するための下側ねじ止め部を配設したことを特徴とする請求項１乃至３のいずれかに記載の電動工具。   The lower end portion of the brush holder is formed in a D-cut shape, and a lower screwing portion for fixing the lower portions of the pair of half-cracked housings to each other is provided in a new space portion formed below the brush holder. The electric tool according to any one of claims 1 to 3, wherein 上記ブラシホルダの上端部近傍位置に、一対の半割れハウジングの上部同士を互いに固定するための上側ねじ止め部を配設したことを特徴とする請求項１乃至４のいずれかに記載の電動工具。   5. The electric power tool according to claim 1, wherein an upper screwing portion for fixing the upper portions of the pair of half-cracked housings to each other is disposed in the vicinity of the upper end portion of the brush holder. . 上記放熱板に、モータの駆動軸を回転自在に軸支するベアリングを接触させたことを特徴とする請求項２又は３記載の電動工具。
4. The electric tool according to claim 2, wherein a bearing for rotatably supporting a motor drive shaft is brought into contact with the heat radiating plate.
JP2005333286A 2005-11-17 2005-11-17 Electric tool Expired - Fee Related JP4631663B2 (en)

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