JP5311276B2 - Electric tool - Google Patents

Electric tool Download PDF

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JP5311276B2
JP5311276B2 JP2008186214A JP2008186214A JP5311276B2 JP 5311276 B2 JP5311276 B2 JP 5311276B2 JP 2008186214 A JP2008186214 A JP 2008186214A JP 2008186214 A JP2008186214 A JP 2008186214A JP 5311276 B2 JP5311276 B2 JP 5311276B2
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locking
stator
restraining
locked
tool
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JP2010028959A (en
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眞一 坂本
英之 谷本
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Koki Holdings Co Ltd
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Hitachi Koki Co Ltd
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本発明は電動工具に関し、特に電動工具を駆動するモータに関する。   The present invention relates to a power tool, and more particularly to a motor that drives the power tool.

電動工具は高負荷で使用されることが多く、過負荷作業によりモータのコイルに大電流が流れて発熱し、コイルが焼損する場合がある。この発熱を抑制するために、コイルに用いられる導線の線径を大きくしてコイルの抵抗値を低くするという方法がある。しかし、モータによってコイルの巻線スペースは限られているため、巻線可能な導線の線径は限りがある。   Electric tools are often used with a high load, and a large current flows through a motor coil due to an overload operation, and the coil may burn out. In order to suppress this heat generation, there is a method in which the resistance value of the coil is lowered by increasing the diameter of the conducting wire used in the coil. However, since the winding space of the coil is limited by the motor, the diameter of the wire that can be wound is limited.

そこで、例えば固定子においては、固定子を構成するコアを分割することによってコイルの巻線スペースを向上させると共に巻線工程を容易にする等により、コイルの占積率を向上させ、更に太い導線を巻線してコイルを形成し発熱を抑制する方法が施されてきた。   Therefore, for example, in the stator, the coil space is improved by dividing the core that constitutes the stator, and the winding process is facilitated. A method for suppressing heat generation by winding a wire to form a coil has been applied.

前述したように固定子を構成するコアを複数の分割コアに分割した際は、コイルを分割コアに巻線した後に、分割コアを一体化する必要がある。この一体化に関しては、複数のコアのそれぞれの接合部を溶接により結合させて一体化する方法や、特許文献1に示されるように、コアの接合部形状を鈎状にして嵌合させ一体化する方法がある。
特許第3264329号公報
As described above, when the core constituting the stator is divided into a plurality of divided cores, it is necessary to integrate the divided cores after winding the coils around the divided cores. With regard to this integration, a method for integrating the respective joints of a plurality of cores by welding, and as shown in Patent Document 1, the joints of the cores are fitted in a bowl shape to be integrated. There is a way to do it.
Japanese Patent No. 3264329

接合部を溶接により接合する場合は、溶接によりコアが変質して磁気性能が悪化するおそれがあった。また接合部を嵌合させる場合は、分割コアの形状が複雑になり、生産性が劣っていた。また鈎状部分を嵌合する際には高い圧入力を必要とし、一体化工程が容易ではなかった。   When joining a joint part by welding, there was a possibility that the core may be altered by welding and the magnetic performance may be deteriorated. Moreover, when fitting a junction part, the shape of the division | segmentation core became complicated and productivity was inferior. Further, when fitting the hook-shaped portion, a high pressure input is required, and the integration process is not easy.

よって本発明は、固定子を構成するコアの性能低減を抑制すると共に容易に一体化できるモータを備えた電動工具を提供することを目的とする。   Therefore, an object of this invention is to provide the electric tool provided with the motor which suppresses the performance reduction of the core which comprises a stator and can be integrated easily.

上記課題を解決するために本発明は、ハウジングと、該ハウジング内に配置されて先端工具を駆動するモータと、を備え、該モータは、該ハウジングに保持される固定子と、該固定子に装着される複数のコイル部と、該固定子内に回転可能に配置され回転軸と直交する断面が略円形の回転子とを備えて構成され、該固定子は該回転軸と平行に延びる分割面で付き合わされた複数の分割コアが組みあわされて構成される枠体から構成され、該枠体には複数の分割コアを繋ぎ合わせる複数の拘束具が設けられ、該複数の分割コアは、該枠体構成時に外周面の一部に被係止部がそれぞれ形成されると共に、該拘束具の装着箇所であって該拘束具が該枠体に装着された状態で内方に該拘束具を収容する収容溝部がそれぞれ形成され、該複数の拘束具は、第一の該分割コアの該被係止部に係止される第一係止部と、該第一の分割コアに隣り合う第二の該分割コアの該被係止部に係止される第二係止部と、該第一係止部と該第二係止部とを連結する連結部と、をそれぞれ備え、該収容溝部は、該枠体の周方向に延び、該分割コアは、複数の鋼板が該回転軸の軸方向に積層されて構成され、該複数の鋼板は、周縁の一部が該収容溝部の底面を成して該外周面の一部となるとともに該被係止部を提供する底面形成板と、周縁の一部が該外周面の他部を成す周面形成板と、を備え、該拘束具は、該枠体の外周形状に沿った略円弧状に形成され、若しくは該枠体の外周形状に沿った略円弧形状を備えた略U字形状に形成され、該第一係止部と該第二係止部とは、該拘束具の該枠体の周方向一端と他端とにそれぞれ設けられ、該被係止部は該軸方向に延び該枠体の周方向において該周面の略中央に一本形成される係止溝部により提供され、該拘束具は該周方向を長尺とする板状部材から構成され、該第一係止部と該第二係止部とは、該板状部材の長尺方向両端部がそれぞれ鈎状に折り曲げられて構成され、該複数の拘束具の内、第一の該拘束具の該第一係止部は該第一の該分割コアにおける該係止溝部の他側内面に掛止して係止され、該第一の該拘束具に隣り合う第二の該拘束具の該第二係止部は該第一の該分割コアにおける該係止溝部の一側内面に掛止して係止される電動工具を提供する。 In order to solve the above problems, the present invention includes a housing and a motor that is disposed in the housing and drives a tip tool, and the motor includes a stator that is held in the housing, and a stator. a plurality of coil portions to be mounted, the cross-sectional surface that is rotatably disposed within the stator perpendicular to the rotary shaft is constituted by a substantially circular rotor, stator extending parallel to said rotation axis It is composed of a frame that is formed by combining a plurality of divided cores associated with each other on a dividing surface, and the frame is provided with a plurality of restraining tools that connect the plurality of divided cores. some of the outer peripheral surface when the frame body structure with the engaged portions are formed respectively, said restraint toward the inner an installation position of the restraint in a state in which said restraint is attached to the frame body Receiving grooves are respectively formed, and the plurality of restraining tools are The first locking portion locked to the locked portion of the first split core and the locked portion of the second split core adjacent to the first split core are locked. A second locking part, and a connecting part that connects the first locking part and the second locking part , the receiving groove part extending in the circumferential direction of the frame body, A plurality of steel plates are laminated in the axial direction of the rotating shaft, and the plurality of steel plates are part of the outer peripheral surface with a part of the peripheral edge forming the bottom surface of the receiving groove portion A bottom surface forming plate that provides a stop, and a peripheral surface forming plate in which a part of the periphery forms the other part of the outer peripheral surface, and the restraining tool has a substantially arc shape along the outer peripheral shape of the frame body The first locking portion and the second locking portion are formed in a substantially U shape having a substantially arc shape along the outer peripheral shape of the frame body. At one end and the other end in the circumferential direction Each of the locked portions is provided by a locking groove portion that extends in the axial direction and is formed at a substantially center of the peripheral surface in the circumferential direction of the frame body, and the restraining tool is provided in the circumferential direction. The first locking portion and the second locking portion are configured by bending both end portions in the lengthwise direction of the plate-like member in a hook shape, Of the plurality of restraining tools, the first locking portion of the first restraining device is hooked and locked to the other inner surface of the locking groove in the first split core, The second locking portion of the second restraining tool adjacent to the restraining tool provides an electric tool that is hooked and locked to one inner surface of the locking groove in the first split core. .

この様な構成によると、拘束具で分割コアを接続するため、溶接等の手段を用いずとも、分割コアを一体化することができる。また分割コアには拘束具の第一、第二係止部が係止する被係止部を形成する必要があるが、この被係止部においては、拘束具により第一の分割コアに対する第二の分割コアの、第一の分割コアから隣り合う第二の分割コアに向かう方向における動きを規制可能な構成が採れればよく、複雑な形状を採る必要がない。また拘束具は、分割コアの収容溝部内に配置されて周面内方に位置するため、枠体を形成した状態で、枠体の外周部分から拘束具が突出することが抑制される。   According to such a configuration, since the split core is connected by the restraining tool, the split core can be integrated without using means such as welding. In addition, the split core needs to be formed with locked portions that are locked by the first and second locking portions of the restraining tool. It is only necessary to adopt a configuration that can regulate the movement of the second divided core in the direction from the first divided core toward the adjacent second divided core, and it is not necessary to adopt a complicated shape. Moreover, since a restraint tool is arrange | positioned in the accommodation groove part of a division | segmentation core, and is located in a circumferential surface inner side, it is suppressed that a restraint tool protrudes from the outer peripheral part of a frame body in the state which formed the frame body.

の様な構成によると、容易に収容溝部を形成することができる。 According to such configuration of this, it is possible to easily form the receiving groove.

この様な構成によると、係止溝部内に係止した拘束具が係止溝部から外れ難くなる。よって拘束具を枠体に装着後に拘束具が枠体から外れることが抑制される。   According to such a configuration, the restraining tool locked in the locking groove is difficult to come off from the locking groove. Therefore, it is suppressed that a restraint tool remove | deviates from a frame after mounting a restraint tool to a frame.

本発明の電動工具によれば、固定子を構成するコアの性能低減を抑制すると共にこれらのコアを容易に一体化できる。   According to the electric tool of the present invention, it is possible to suppress the performance reduction of the cores constituting the stator and to easily integrate these cores.

以下、本発明の実施の形態に係る電動工具について図1乃至図9に基づき説明する。図1に示される電動工具であるディスクグラインダ1は、ハウジング2と、モータ3と、ギヤ機構6と、先端工具である砥石7とから主に構成されている。   Hereinafter, a power tool according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9. A disc grinder 1 that is an electric tool shown in FIG. 1 mainly includes a housing 2, a motor 3, a gear mechanism 6, and a grindstone 7 that is a tip tool.

ハウジング2は、内部にモータ3を収容しており、後端にモータ3に電力を供給する図示せぬ電源スイッチを収納するテールカバー21を有している。また先端にはギヤ機構6を内蔵するギヤカバー22を有している。テールカバー21にはハウジング2内に外気を取り入れる空気吸入孔21aが形成されており、ギヤカバー22にはハウジング2内の空気を外気中に排出する空気排出孔22aが形成されている。モータ3は、主に固定子3Aと回転子3Bとから構成されており、回転子3Bの先端部分に出力軸31が設けられている。出力軸31の根本部分には、ファン32が設けられており、出力軸31が回転することによりファン32が回転し、ハウジング2内に空気吸入孔21aから空気排出孔22aへ向かう気流を発生させてモータ3を冷却している。   The housing 2 accommodates the motor 3 therein, and has a tail cover 21 that accommodates a power switch (not shown) that supplies power to the motor 3 at the rear end. A gear cover 22 incorporating the gear mechanism 6 is provided at the tip. The tail cover 21 is formed with an air suction hole 21a for taking in the outside air into the housing 2, and the gear cover 22 is formed with an air discharge hole 22a for discharging the air inside the housing 2 into the outside air. The motor 3 is mainly composed of a stator 3A and a rotor 3B, and an output shaft 31 is provided at a tip portion of the rotor 3B. A fan 32 is provided at the root portion of the output shaft 31, and the fan 32 rotates as the output shaft 31 rotates to generate an air flow from the air suction hole 21 a to the air discharge hole 22 a in the housing 2. The motor 3 is cooled.

ギヤ機構6は、第一ベベルギヤ61と、第二ベベルギヤ62と回転軸63とから主に構成され、ギヤカバー22内に収容されている。第一ベベルギヤ61は出力軸31に設けられており、第二ベベルギヤ62は、回転軸が出力軸31と直行するように配置されて第一ベベルギヤ61と噛合している。回転軸63は、第二ベベルギヤ62に同軸回転可能に固定されており、ギヤカバー22に軸受を介して支持され、第二ベベルギヤ62の回転軸として作用している。   The gear mechanism 6 mainly includes a first bevel gear 61, a second bevel gear 62, and a rotating shaft 63, and is accommodated in the gear cover 22. The first bevel gear 61 is provided on the output shaft 31, and the second bevel gear 62 is disposed so that the rotation shaft is orthogonal to the output shaft 31 and meshes with the first bevel gear 61. The rotating shaft 63 is fixed to the second bevel gear 62 so as to be coaxially rotatable, is supported by the gear cover 22 via a bearing, and functions as a rotating shaft of the second bevel gear 62.

砥石7は回転軸63の先端に固定され、回転軸63と同軸回転可能に構成されている。砥石7の周辺には、ギヤカバー22に固定されて砥石7を保護するカバー7Aが設けられている。砥石7は回転軸63に同軸回転可能に固定されているため、モータ3の出力軸31の回転により、砥石7が回転して、被加工物を切削・研磨等することができる。   The grindstone 7 is fixed to the tip of the rotary shaft 63 and is configured to be rotatable coaxially with the rotary shaft 63. A cover 7 </ b> A that is fixed to the gear cover 22 and protects the grindstone 7 is provided around the grindstone 7. Since the grindstone 7 is fixed to the rotary shaft 63 so as to be coaxially rotatable, the grindstone 7 is rotated by the rotation of the output shaft 31 of the motor 3 so that the workpiece can be cut and polished.

次にモータ3について説明する。モータ3は磁極を二つ備える二極整流子モータであり、固定子3Aの内部空間内に回転子3Bが収容される形態を採っている。固定子3Aは金属材料を基材とし、半割に分割された対称形状の第一、第二固定子コア4、4から主に構成されており、導線が巻回されて構成され各の固定子コア4に装着される第一、第二固定子コイル束3C、3Cが後述の磁極部41に巻回されており、対称形状の第一、第二固定子コア4、4が複数の拘束具8により拘束されて接続され、外周部分となる後述の第一、第二ヨーク部42A、42Bでハウジング2に保持されている。図2に示されるように第一、第二固定子コア4、4は組合わされて固定子3Aを構成する枠体を形成しており、枠体の外周方向と直行する方向に貫通する貫通孔を形成する。   Next, the motor 3 will be described. The motor 3 is a two-pole commutator motor having two magnetic poles, and takes a form in which the rotor 3B is accommodated in the internal space of the stator 3A. The stator 3A is mainly composed of symmetrical first and second stator cores 4 and 4 which are divided into halves using a metal material as a base material. The first and second stator coil bundles 3C and 3C attached to the child core 4 are wound around a magnetic pole portion 41 described later, and the symmetrical first and second stator cores 4 and 4 have a plurality of restraints. It is restrained and connected by the tool 8 and is held in the housing 2 by first and second yoke portions 42A and 42B, which will be described later, serving as outer peripheral portions. As shown in FIG. 2, the first and second stator cores 4, 4 are combined to form a frame that constitutes the stator 3 </ b> A, and a through hole that penetrates in a direction perpendicular to the outer peripheral direction of the frame Form.

回転子3Bは、円柱状に構成されて円柱の軸部分に回転軸となる出力軸31が配置され、出力軸31の軸方向が枠体内の貫通孔の方向と同一になるように配置されている。第一、第二固定子コア4、4における貫通孔の方向を以下軸方向と定義し、軸方向と直交し第一、第二固定子コア4、4から構成される枠体の外周に沿った方向を外周方向と定義する。また第一、第二固定子コア4、4から構成される枠体の外周となる部分を第一、第二固定子コア4、4それぞれの外周と定義する。   The rotor 3B is configured in a columnar shape, and an output shaft 31 serving as a rotation shaft is disposed in a shaft portion of the column. Yes. The direction of the through hole in the first and second stator cores 4 and 4 is hereinafter defined as the axial direction, and is orthogonal to the axial direction along the outer periphery of the frame configured by the first and second stator cores 4 and 4. This direction is defined as the outer circumferential direction. Moreover, the part used as the outer periphery of the frame comprised from the 1st, 2nd stator cores 4 and 4 is defined as the outer periphery of each of the 1st and 2nd stator cores 4 and 4. FIG.

第二固定子コア4、4はいずれも対称形状であるので、特に言及しない限りは第一固定子コア4について説明する。第一固定子コア4は、それぞれ厚さ0.5mm程度である第一鋼板4Aと第二鋼板4Bとが軸方向に積層されて構成されている。第二鋼板4Bは、底面形成板として、第一固定子コア4の軸方向両端に四枚ずつ積層されており、両端に積層された第二鋼板4Bの間に第一鋼板4Aが周面形成板として複数枚積層されている。図4及び図5(a)(b)に示されるように第一鋼板4Aと第二鋼板4Bとは、それぞれ磁極部41と磁極部41の該周方向一端側及び他端側に位置する第一ヨーク部42A及び第二ヨーク部42Bとから構成されており、第一ヨーク部42A及び第二ヨーク部42Bにおける外周部分の構成が異なるように構成されている。 Since the second stator cores 4 and 4 are all symmetrical, the first stator core 4 will be described unless otherwise specified. The first stator core 4 is configured by laminating a first steel plate 4A and a second steel plate 4B each having a thickness of about 0.5 mm in the axial direction. The second steel plate 4B is laminated as a bottom surface forming plate at four axial ends of the first stator core 4, and the first steel plate 4A is formed between the second steel plates 4B stacked at both ends. A plurality of sheets are stacked as a plate . As shown in FIGS. 4 and 5 (a) and 5 (b), the first steel plate 4A and the second steel plate 4B are respectively positioned on one end side and the other end side in the circumferential direction of the magnetic pole portion 41 and the magnetic pole portion 41, respectively. The first yoke portion 42A and the second yoke portion 42B are configured so that the configurations of the outer peripheral portions of the first yoke portion 42A and the second yoke portion 42B are different.

第一鋼板4Aと第二鋼板4Bとのそれぞれの磁極部41は、図4に示されるように、回転子3B(図1)に近接する磁極41Cと、磁極41Cから該周方向一端側と他端側とに向けて回転子3B(図1)に近接した状態で延出される第一腕部41A及び第二腕部41Bとから構成されている。また第一腕部41Aと第一ヨーク部42Aとの間、第二腕部41Bと第二ヨーク部42Bとの間には、導線が巻回されて第一固定子コイル束3Cが構成される第一スロット41aと第二スロット41bとがそれぞれ形成されている。磁極部41の外周面であって磁極41Cの背面となる位置には、第一固定子コア4と第二固定子コア4とを接続した状態で第一固定子コア4から第二固定子コア4に向かう仮想の軸と直交する平面が形成されており、この平面の外周方向一方側に第一係止面4Cが規定され、外周方向他方側に第二係止面4Dが規定されており、第一係止面4Cと第二係止面4Dとから被係止部が構成される。また第一係止面4Cと第二係止面4Dとの間であって第一固定子コア4の外周において該周方向略中央となる位置には、軸方向に延びる一本の係止溝4aが形成されている。   As shown in FIG. 4, each magnetic pole portion 41 of the first steel plate 4 </ b> A and the second steel plate 4 </ b> B includes a magnetic pole 41 </ b> C adjacent to the rotor 3 </ b> B (FIG. 1), one end side in the circumferential direction from the magnetic pole 41 </ b> C, and the like. The first arm portion 41 </ b> A and the second arm portion 41 </ b> B extend toward the end side in a state of being close to the rotor 3 </ b> B (FIG. 1). Further, a conductive wire is wound between the first arm portion 41A and the first yoke portion 42A, and between the second arm portion 41B and the second yoke portion 42B, thereby forming the first stator coil bundle 3C. A first slot 41a and a second slot 41b are formed. The first stator core 4 to the second stator core are connected to the first stator core 4 and the second stator core 4 at a position on the outer peripheral surface of the magnetic pole portion 41 and the back surface of the magnetic pole 41C. A plane perpendicular to the virtual axis toward 4 is formed, a first locking surface 4C is defined on one side of the outer circumferential direction of this plane, and a second locking surface 4D is defined on the other side in the outer circumferential direction. The locked portion is configured by the first locking surface 4C and the second locking surface 4D. One locking groove extending in the axial direction is provided between the first locking surface 4C and the second locking surface 4D and at a position substantially at the center in the circumferential direction on the outer periphery of the first stator core 4. 4a is formed.

第一ヨーク部42Aの磁極部41からの延出方向先端には第二固定子コア4の第二ヨーク部42Bと付き合わされる分割面を構成する凸部43Aが設けられており、第二ヨーク部42Bの磁極部41からの延出方向先端には第二固定子コア4の第一ヨーク部42Aと付き合わされる分割面から画成される凹部43bが形成されている。よって第一固定子コア4の凸部43Aと凹部43bとが、第二固定子コア4の凹部43bと凸部43Aとにそれぞれ嵌合し、第一固定子コア4と第二固定子コア4とを確実に接合する。   At the front end of the first yoke portion 42A in the extending direction from the magnetic pole portion 41, a convex portion 43A that constitutes a split surface to be brought into contact with the second yoke portion 42B of the second stator core 4 is provided. A concave portion 43b defined by a split surface mated with the first yoke portion 42A of the second stator core 4 is formed at the front end of the portion 42B in the extending direction from the magnetic pole portion 41. Therefore, the convex portion 43A and the concave portion 43b of the first stator core 4 are fitted into the concave portion 43b and the convex portion 43A of the second stator core 4, respectively, so that the first stator core 4 and the second stator core 4 are fitted. And are securely joined.

また図5(a)に示される第一鋼板4Aの第一ヨーク部42A及び第二ヨーク部42B部分における周面4Eの曲率半径D1は、図5()に示される第2鋼板4Bの第一ヨーク部42A及び第二ヨーク部42B部分における周面4Fの曲率半径D2に比べて大きく成るように構成されている(図3)。よって図3及び図4に示されるように、第一鋼板4Aと第二鋼板4Bとを複数枚積層した際には、第一鋼板4A部分と第二鋼板4Bの周面4F部分に周面4Fを底面とする収容溝部である溝4bが形成される。この溝4bの深さΔD(=(D1−D2)/2)は、拘束具8を構成する後述の金属板の板厚と略同じか、僅かに大きくなるように構成されている。 Moreover, the curvature radius D1 of the peripheral surface 4E in the first yoke portion 42A and the second yoke portion 42B of the first steel plate 4A shown in FIG. 5A is the same as that of the second steel plate 4B shown in FIG. 5B . The one yoke portion 42A and the second yoke portion 42B are configured to be larger than the radius of curvature D2 of the peripheral surface 4F (FIG. 3). Therefore, as shown in FIGS. 3 and 4, when a plurality of the first steel plates 4A and the second steel plates 4B are stacked, the peripheral surface 4F is formed on the first steel plate 4A and the peripheral surface 4F of the second steel plate 4B. A groove 4b, which is a housing groove portion having a bottom surface as a bottom, is formed. The depth ΔD (= (D1−D2) / 2) of the groove 4b is configured to be substantially the same as or slightly larger than the plate thickness of a metal plate to be described later constituting the restraint 8.

第一鋼板4A及び第二鋼板4Bのそれぞれには、第一鋼板4Aと第二鋼板4Bとを積層した状態で同位置となる様に、磁極部41と第一ヨーク部42Aと第二ヨーク部42Bとの三箇所にカシメ片44A〜44Cがそれぞれ打ち出されて構成されている。よって図6に示されるように、第一鋼板4Aと第二鋼板4Bとを積層すると、カシメ片44Aが打ち出された空間に隣り合う第一鋼板4A若しくは第二鋼板4Bのカシメ片44Aが嵌合する。カシメ片44B、44Cでも同様に嵌合するため、複数の第一鋼板4Aと第二鋼板4Bとが積層された状態で保たれることができる。尚、図6に示されるように、カシメ片44Aが突出する方向の端部となる二枚の第二鋼板4Bについては、カシメ片44Aの代わりにカシメ片44と同じ輪郭の孔44aがそれぞれ形成されている。これはカシメ片44B、44C部分でも同様の構成を採っている。これにより、複数の第一鋼板4Aと第二鋼板4Bとが積層されて第一固定子コア4が構成された際に、第一固定子コア4の軸方向端部からカシメ片44が突出することが抑制される。   In each of the first steel plate 4A and the second steel plate 4B, the magnetic pole portion 41, the first yoke portion 42A, and the second yoke portion are arranged in the same position in a state where the first steel plate 4A and the second steel plate 4B are laminated. Caulking pieces 44A to 44C are respectively formed at three locations with 42B. Therefore, as shown in FIG. 6, when the first steel plate 4A and the second steel plate 4B are laminated, the caulking piece 44A of the first steel plate 4A or the second steel plate 4B adjacent to the space where the caulking piece 44A is punched is fitted. To do. Since the crimping pieces 44B and 44C are similarly fitted, the plurality of first steel plates 4A and the second steel plates 4B can be maintained in a stacked state. In addition, as shown in FIG. 6, with respect to the two second steel plates 4B serving as the end portions in the direction in which the crimping piece 44A protrudes, holes 44a having the same contour as the crimping piece 44 are formed instead of the crimping piece 44A, respectively. Has been. This also adopts the same configuration in the caulking pieces 44B and 44C. Accordingly, when the first stator core 4 is configured by laminating the plurality of first steel plates 4A and the second steel plates 4B, the caulking pieces 44 protrude from the end portions in the axial direction of the first stator core 4. It is suppressed.

拘束具8はバネ特性を備えた長尺状の金属板が折り曲げられて製造され、図に示されるように長手方向の一端及び他端にそれぞれ位置する第一係止部8A及び第二係止部8Bと、第一係止部8Aとび第二係止部8Bとの間に位置する連結部8Cとから構成されている。第一係止部8Aと第二係止部8Bとは、それぞれ略平行な平板状に構成され、連結部8Cは、枠体の外周形状に沿った円弧状に構成されている。よって拘束具8は、第一係止部8A及び第二係止部8Bを腕部とする略U字状に形状化されている。また第一係止部8Aから第二係止部8Bまでの間の距離は、第一固定子コア4と第二固定子コア4とを接合した状態で第一固定子コア4の第一係止面4C及び第二係止面4Dを含む平面から第二固定子コア4の第一係止面4C及び第二係止面4Dを含む平面までの距離より僅かに短く構成されている。
The restraining tool 8 is manufactured by bending a long metal plate having spring characteristics, and as shown in FIG. 7 , the first locking portion 8A and the second engaging portion are located at one end and the other end in the longitudinal direction, respectively. It is comprised from the stop part 8B and the connection part 8C located between the 1st latching | locking part 8A and the 2nd latching | locking part 8B. 8 A of 1st latching | locking parts and the 2nd latching | locking part 8B are comprised by the substantially parallel flat form, respectively, and the connection part 8C is comprised by the circular arc shape along the outer periphery shape of a frame. Therefore, the restraint tool 8 is shaped into a substantially U shape with the first locking portion 8A and the second locking portion 8B as arms. The distance from the first locking portion 8A to the second locking portion 8B is such that the first stator core 4 and the second stator core 4 are joined together in the state where the first stator core 4 and the second stator core 4 are joined. The distance from the plane including the stop surface 4C and the second locking surface 4D to the plane including the first locking surface 4C and the second locking surface 4D of the second stator core 4 is slightly shorter.

複数の第一鋼板4Aと第二鋼板4Bとを積層して第一固定子コア4を形成した後に、その表面に絶縁塗装等を施し、図8(a)(b)に示されるように、第一スロット41a、第二スロット41b内に配線するように導線を磁極部41に巻回して第一固定子コイル束3Cを形成して装着する。第二固定子コア4にも同様に第二固定子コイル束3Cを装着し、その後に、第一固定子コア4の凸部43A及び凹部43bと第二固定子コア4の凹部43b及び凸部43Aとの嵌合により第一固定子コア4と第二固定子コア4とを接合する。   After forming the first stator core 4 by laminating the plurality of first steel plates 4A and the second steel plates 4B, the surface is subjected to insulation coating or the like, as shown in FIGS. 8 (a) and 8 (b), A conducting wire is wound around the magnetic pole portion 41 so as to be wired in the first slot 41a and the second slot 41b, and the first stator coil bundle 3C is formed and attached. Similarly, the second stator coil bundle 3C is mounted on the second stator core 4, and thereafter, the convex portions 43A and concave portions 43b of the first stator core 4 and the concave portions 43b and convex portions of the second stator core 4 are provided. The first stator core 4 and the second stator core 4 are joined by fitting with 43A.

第一固定子コア4と第二固定子コア4とを部43A及び凹部43bで接合した後に、拘束具8を第一固定子コア4と第二固定子コア4とに跨って装着する。拘束具8を第一固定子コア4の収容溝4aの他端側に装着する際は、図2に示されるように、第一係止部8Aが第一固定子コア4の第二係止面4Dに当接し、第二係止部8Bが第二固定子コア4の第一係止面4Cに当接し、連結部8Cが溝4b(図8)内に収容されるように装着する。また拘束具8を第一固定子コア4の収容溝4aの一端側に装着する際は、第一係止部8Aが第二固定子コア4の第二係止面4Dに当接し、第二係止部8Bが第一固定子コア4の第一係止面4Cに当接し、連結部8Cが溝4b(図8)内に収容されるように装着する。第一係止面4C及び第二係止面4Dは、それぞれ第一固定子コア4から第二固定子コア4に向かう方向と直交する平面であり、第一係止面4C及び第二係止面4Dに当接する第一係止部8A及び第二係止部8Bは、その間の距離が第一固定子コア4の第一係止面4C及び第二係止面4Dから第二固定子コア4の第一係止面4C及び第二係止面4Dまでの距離より小さいため、拘束具8で第一固定子コア4と第二固定子コア4とを挟持して拘束し、第一固定子コア4と第二固定子コア4とが互いに解離せず一体化する。   After the first stator core 4 and the second stator core 4 are joined by the portion 43 </ b> A and the recessed portion 43 b, the restraining tool 8 is mounted across the first stator core 4 and the second stator core 4. When the restraint 8 is mounted on the other end of the housing groove 4 a of the first stator core 4, the first locking portion 8 </ b> A is engaged with the second locking of the first stator core 4 as shown in FIG. 2. The second locking portion 8B is in contact with the surface 4D, the second locking portion 8B is in contact with the first locking surface 4C of the second stator core 4, and the connecting portion 8C is mounted so as to be accommodated in the groove 4b (FIG. 8). When the restraint 8 is mounted on one end side of the housing groove 4a of the first stator core 4, the first locking portion 8A comes into contact with the second locking surface 4D of the second stator core 4, and the second The engaging portion 8B is attached so as to abut on the first engaging surface 4C of the first stator core 4 and the connecting portion 8C is accommodated in the groove 4b (FIG. 8). The first locking surface 4C and the second locking surface 4D are planes orthogonal to the direction from the first stator core 4 toward the second stator core 4, respectively. The first locking portion 8A and the second locking portion 8B that are in contact with the surface 4D have a distance between the first locking surface 4C and the second locking surface 4D of the first stator core 4 and the second stator core. 4 is smaller than the distance to the first locking surface 4C and the second locking surface 4D, and the first stator core 4 and the second stator core 4 are clamped and restrained by the restraining tool 8, and the first fixing is performed. The child core 4 and the second stator core 4 are integrated without being separated from each other.

拘束具8は、溝4b内に収容されて装着されており、固定子3Aの外周となる第一鋼板4Aの周面4Eより内方に位置するため、固定子3Aが大型化することは抑制される。また拘束具8は金属製であるため、第一固定子コア4と第二固定子コア4とに装着された後は、磁束を通す磁路の一部になる。よって溝4bを形成したことによる第一固定子コア4と第二固定子コア4との磁気性能の低下を抑制することができる。   Since the restraining tool 8 is housed and mounted in the groove 4b and is located inward from the peripheral surface 4E of the first steel plate 4A serving as the outer periphery of the stator 3A, the increase in size of the stator 3A is suppressed. Is done. Further, since the restraint 8 is made of metal, after being attached to the first stator core 4 and the second stator core 4, it becomes a part of the magnetic path through which the magnetic flux passes. Therefore, it is possible to suppress a decrease in magnetic performance between the first stator core 4 and the second stator core 4 due to the formation of the grooves 4b.

また第一係止面4C及び第二係止面4Dは、第一固定子コア4から第二固定子コア4に向かう方向にのみ拘束具8と係止すればよいため、本実施の形態に示されるように平面状構成しても何ら不都合はなく、逆に平面状に構成することにより第一係止面4C及び第二係止面4Dを容易に構成することができる。また第一係止部8A、第二係止部8Bを第一係止面4C及び第二係止面4Dに装着する際は、第一係止部8A、第二係止部8Bが第一係止面4C及び第二係止面4Dの平面上を摺動して装着されるため、その装着が容易になる。   Further, the first locking surface 4C and the second locking surface 4D need only be locked with the restraining tool 8 in the direction from the first stator core 4 toward the second stator core 4, and therefore, in the present embodiment. As shown, there is no inconvenience even if it is configured in a planar shape. Conversely, the first locking surface 4C and the second locking surface 4D can be easily configured by configuring in a planar shape. Further, when the first locking portion 8A and the second locking portion 8B are mounted on the first locking surface 4C and the second locking surface 4D, the first locking portion 8A and the second locking portion 8B are the first. Since the mounting is performed by sliding on the flat surfaces of the locking surface 4C and the second locking surface 4D, the mounting becomes easy.

本発明の電動工具においては、上述の実施の形態に限定されず、特許請求の範囲に記載された範囲で種々の変形や改良が可能である。例えば図10に示されるように、拘束具108において、第一係止部108Aと第二係止部108Bとのそれぞれの先端を鈎状に折り曲げてもよい。そして図11に示されるように、第一係止部108Aに設けられた鈎状部を係止溝4aを画成する他端側面41Dに掛止し、第二係止部108Bに設けられた鈎状部を係止溝4aを画成する一端側面41Dに掛止することにより、装着された拘束具108が第一固定子コア4及び第二固定子コア4から脱落することが抑制される。   In the electric tool of this invention, it is not limited to the above-mentioned embodiment, A various deformation | transformation and improvement are possible in the range described in the claim. For example, as shown in FIG. 10, in the restraining tool 108, the respective leading ends of the first locking portion 108A and the second locking portion 108B may be bent in a hook shape. Then, as shown in FIG. 11, the hook-shaped portion provided in the first locking portion 108A is hooked to the other end side surface 41D that defines the locking groove 4a, and is provided in the second locking portion 108B. By hooking the hook-like portion on one end side surface 41D that defines the locking groove 4a, it is possible to prevent the attached restraining tool 108 from falling off from the first stator core 4 and the second stator core 4. .

また本実施の形態では、第一固定子コア4において軸方向両端の二箇所に拘束具を収容する溝を形成したが、これに限らず図12に示されるように軸方向略中間部分に溝4bを設けてもよい。この構成を採ることにより、第一固定子コア4と第二固定子コア4とを拘束具で拘束した後に、第一固定子コア4と第二固定子コア4との軸方向のずれを抑制することができる。   Further, in the present embodiment, the grooves for accommodating the restraining tool are formed at two positions on both ends in the axial direction in the first stator core 4. However, the present invention is not limited to this, and a groove is formed in the substantially intermediate portion in the axial direction as shown in FIG. 4b may be provided. By adopting this configuration, after the first stator core 4 and the second stator core 4 are constrained by a restraining tool, the axial displacement between the first stator core 4 and the second stator core 4 is suppressed. can do.

また本実施の形態では二分割のコアを用いたが、これに限らず三分割等の更なる多分割のコアでも適用することが可能である。また拘束具は、略U字形状に構成したがこれに限らず円弧形状でもよい。   In the present embodiment, a bipartite core is used. However, the present invention is not limited to this, and a multi-divided core such as a tripartite core can also be applied. Moreover, although the restraint tool was comprised in the substantially U shape, not only this but circular arc shape may be sufficient.

本発明の実施の形態にかかる電動工具の側面断面図。Side surface sectional drawing of the electric tool concerning embodiment of this invention. 本発明の実施の形態にかかる電動工具の固定子の正面図。The front view of the stator of the electric power tool concerning an embodiment of the invention. 本発明の実施の形態にかかる電動工具の固定子コアの平面図。The top view of the stator core of the electric tool concerning embodiment of this invention. 本発明の実施の形態にかかる電動工具の固定子コアの正面図。The front view of the stator core of the electric tool concerning embodiment of this invention. 本発明の実施の形態にかかる電動工具の固定子コアを構成する(a)第一鋼板(b)第二鋼板の正面図。The front view of (a) 1st steel plate (b) 2nd steel plate which comprises the stator core of the electric tool concerning embodiment of this invention. 本発明の実施の形態にかかる電動工具の固定子コアのカシメによる接合箇所を示す部分断面図。The fragmentary sectional view which shows the joining location by crimping of the stator core of the electric tool concerning embodiment of this invention. 本発明の実施の形態にかかる電動工具の拘束具の斜視図。The perspective view of the restraint tool of the electric tool concerning embodiment of this invention. 本発明の実施の形態にかかる電動工具の固定子に固定子コイル束を装着した状態の(a)平面図(b)正面図。The (a) top view (b) front view of the state which mounted | wore the stator of the electric tool concerning embodiment of this invention with the stator coil bundle mounted. 本発明の実施の形態にかかる電動工具の固定子の平面図。The top view of the stator of the electric tool concerning embodiment of this invention. 本発明の実施の形態の変形例にかかる電動工具の拘束具の斜視図。The perspective view of the restraint tool of the electric tool concerning the modification of embodiment of this invention. 本発明の実施の形態の変形例にかかる電動工具の固定子に拘束具を装着した状態での正面図。The front view in the state where the restraint tool was equipped to the stator of the electric tool concerning the modification of an embodiment of the invention. 本発明の実施の形態の変形例にかかる電動工具の固定子に固定子コイル束を装着した状態での平面図。The top view in the state which mounted | wore the stator coil bundle with the stator of the electric tool concerning the modification of embodiment of this invention.

符号の説明Explanation of symbols

1・・ディスクグラインダ 2・・ハウジング 3・・モータ 3A・・固定子
3B・・回転子 3C・・第一、二固定子コイル束 4・・第一、第二固定子コア
4A・・第一鋼板 4B・・第二鋼板 4C・・第一係止面 4D・・第二係止面
4E・・周面 4a・・係止溝 4b・・溝 6・・ギヤ機構 7・・砥石
7A・・カバー 8・・拘束具 8A・・第一係止部 8B・・第二係止部
8C・・連結部 21・・テールカバー 21a・・空気吸入孔 22・・ギヤカバー
22a・・空気排出孔 31・・出力軸 32・・ファン 41・・磁極部
41A・・第一腕部 41B・・第二腕部 41C・・磁極 41a・・第一スロット
41b・・第二スロット 42A・・第一ヨーク部 42B・・第二ヨーク部
43A・・凸部 43b・・凹部 44A〜44C・・カシメ片 44a・・孔
61・・第一ベベルギヤ 62・・第二ベベルギヤ 63・・回転軸
1. Disc grinder 2. Housing 3. Motor 3A. Stator 3B. Rotor 3C ... First, second stator coil bundle 4. First, second stator core 4A ... First Steel plate 4B ... Second steel plate 4C ... First locking surface 4D ... Second locking surface 4E ... Peripheral surface 4a ... Locking groove 4b ... Groove 6 ... Gear mechanism 7 ... Grinding wheel 7A ... Cover 8 ·· Restraining tool 8A ·· First locking portion 8B ·· Second locking portion 8C ·· Connecting portion 21 ·· Tail cover 21a ·· Air intake hole 22 ·· Gear cover 22a ·· Air discharge hole 31 · · Output shaft 32 · · Fan 41 · · Magnetic pole portion 41A · · First arm portion 41B · · Second arm portion 41C · · Magnetic pole 41a · · First slot 41b · · Second slot 42A · · First yoke portion 42B・ ・ Second yoke part 43A ・ ・ Convex part 43b ・ ・ Concave parts 44A to 44C ・ ・ Oak 44a · · · hole 61 · · first bevel gear 62 · · second bevel gear 63 · · rotating shaft

Claims (1)

ハウジングと、
該ハウジング内に配置されて先端工具を駆動するモータと、を備え、
該モータは、該ハウジングに保持される固定子と、該固定子に装着される複数のコイル部と、該固定子内に回転可能に配置され回転軸と直交する断面が略円形の回転子とを備えて構成され、
該固定子は該回転軸と平行に延びる分割面で付き合わされた複数の分割コアが組みあわされて構成される枠体から構成され、
該枠体には複数の分割コアを繋ぎ合わせる複数の拘束具が設けられ、
該複数の分割コアは、該枠体構成時に外周面の一部に被係止部がそれぞれ形成されると共に、該拘束具の装着箇所であって該拘束具が該枠体に装着された状態で内方に該拘束具を収容する収容溝部がそれぞれ形成され、
該複数の拘束具は、第一の該分割コアの該被係止部に係止される第一係止部と、該第一の分割コアに隣り合う第二の該分割コアの該被係止部に係止される第二係止部と、該第一係止部と該第二係止部とを連結する連結部と、をそれぞれ備え
該収容溝部は、該枠体の周方向に延び、
該分割コアは、複数の鋼板が該回転軸の軸方向に積層されて構成され、
該複数の鋼板は、周縁の一部が該収容溝部の底面を成して該外周面の一部となるとともに該被係止部を提供する底面形成板と、周縁の一部が該外周面の他部を成す周面形成板と、を備え、
該拘束具は、該枠体の外周形状に沿った略円弧状に形成され、若しくは該枠体の外周形状に沿った略円弧形状を備えた略U字形状に形成され、
該第一係止部と該第二係止部とは、該拘束具の該枠体の周方向一端と他端とにそれぞれ設けられ、
該被係止部は該軸方向に延び該枠体の周方向において該周面の略中央に一本形成される係止溝部により提供され、
該拘束具は該周方向を長尺とする板状部材から構成され、該第一係止部と該第二係止部とは、該板状部材の長尺方向両端部がそれぞれ鈎状に折り曲げられて構成され、
該複数の拘束具の内、第一の該拘束具の該第一係止部は該第一の該分割コアにおける該係止溝部の他側内面に掛止して係止され、該第一の該拘束具に隣り合う第二の該拘束具の該第二係止部は該第一の該分割コアにおける該係止溝部の一側内面に掛止して係止されることを特徴とする電動工具。
A housing;
A motor disposed in the housing and driving a tip tool,
The motor comprises a stator that is held by the housing, a plurality of coil portions mounted on the stator, the cross-sectional surface that is rotatably disposed within the stator perpendicular to the rotation axis of the substantially circular rotor And configured with
The stator is composed of a frame configured by combining a plurality of split cores joined together by a split surface extending in parallel with the rotation axis,
The frame body is provided with a plurality of restraining tools for joining a plurality of divided cores,
The plurality of split cores have a locked portion formed on a part of the outer peripheral surface at the time of the frame structure, and the mounting position of the restraining tool and the restraining tool being mounted on the frame body accommodating groove accommodating the restraint is formed respectively on the inner side in,
The plurality of restraining tools include a first locking portion locked to the locked portion of the first split core and the locked portion of the second split core adjacent to the first split core. A second locking portion locked to the locking portion, and a connecting portion that connects the first locking portion and the second locking portion, respectively .
The housing groove extends in the circumferential direction of the frame,
The split core is configured by laminating a plurality of steel plates in the axial direction of the rotating shaft,
The plurality of steel plates include a bottom surface forming plate that provides a portion of the outer peripheral surface with a part of the peripheral edge forming the bottom surface of the housing groove and a part of the peripheral edge of the outer peripheral surface. A peripheral surface forming plate constituting the other part,
The restraining tool is formed in a substantially arc shape along the outer peripheral shape of the frame body, or formed in a substantially U shape with a substantially arc shape along the outer peripheral shape of the frame body,
The first locking part and the second locking part are respectively provided at one end and the other end of the frame body in the circumferential direction,
The locked portion is provided by a locking groove portion that extends in the axial direction and is formed at a substantially center of the peripheral surface in the circumferential direction of the frame,
The restraint device is composed of a plate-like member having a long length in the circumferential direction, and the first locking portion and the second locking portion are formed so that both end portions in the lengthwise direction of the plate-like member are bowl-shaped. Composed of folded,
Of the plurality of restraining tools, the first locking portion of the first restraining device is hooked and locked to the other inner surface of the locking groove in the first split core, The second locking portion of the second restraining tool adjacent to the restraining tool is hooked and locked to one inner surface of the locking groove in the first divided core. Electric tool to do.
JP2008186214A 2008-07-17 2008-07-17 Electric tool Expired - Fee Related JP5311276B2 (en)

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JPH0780768A (en) * 1993-09-16 1995-03-28 Shibaura Eng Works Co Ltd Power tool
JP2001045684A (en) * 1999-07-30 2001-02-16 Hitachi Ltd Manufacturing method of electric motor stator core
JP2002136002A (en) * 2000-10-20 2002-05-10 Matsushita Electric Ind Co Ltd Motor
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