JP2009039844A - Cutter - Google Patents

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Publication number
JP2009039844A
JP2009039844A JP2007209918A JP2007209918A JP2009039844A JP 2009039844 A JP2009039844 A JP 2009039844A JP 2007209918 A JP2007209918 A JP 2007209918A JP 2007209918 A JP2007209918 A JP 2007209918A JP 2009039844 A JP2009039844 A JP 2009039844A
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gear housing
motor
wind window
housing
cover
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JP2007209918A
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Japanese (ja)
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Fumitoshi Numata
文年 沼田
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Makita Corp
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Makita Corp
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Priority to JP2007209918A priority Critical patent/JP2009039844A/en
Priority to CN2008101323796A priority patent/CN101362363B/en
Publication of JP2009039844A publication Critical patent/JP2009039844A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To favorably maintain cooling efficiency by an axial fan. <P>SOLUTION: This cutter 1 is provided with: a wind window 27 to exhaust air for cooling delivered forward from the axial fan 21 fastened on an output shaft 9 between a cylindrical motor housing 5 and a gear housing 6; and an integrally molded blade case 7 in front of the gear housing 6. A cover 29 to close an opening of the gear housing 6 in front of the wind window 27 is provided in the opening of the gear housing 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、モータ駆動する回転刃を備えたカッタに関する。   The present invention relates to a cutter provided with a rotary blade driven by a motor.

カッタは、モータを内蔵した筒状のモータハウジングに、モータの出力軸と、出力軸から回転伝達されるスピンドルとを軸支するギヤハウジングを連結し、ギヤハウジングの前方に設けたブレードケース内にスピンドルを突出させて、円盤状の回転刃を装着可能としている。このブレードケースは、切断方向の前端が、ベース上で上下方向へ回転可能に軸着される一方、切断方向の後端が、ベース上に立設した円弧状のガイド部材に沿った任意の位置で固定可能となっており、モータハウジングに設けたハンドルを把持して被切断材上でベースをスライドさせることで、回転刃によるＡＬＣやレンガ等の被切断材の切断が可能となる。（例えば特許文献１参照）。   The cutter connects a gear housing that supports a motor output shaft and a spindle that is rotated and transmitted from the output shaft to a cylindrical motor housing with a built-in motor. The spindle protrudes and a disc-shaped rotary blade can be mounted. The blade case has a front end in the cutting direction pivotally mounted on the base so as to be vertically rotatable, while a rear end in the cutting direction is at an arbitrary position along an arcuate guide member standing on the base. It is possible to fix the cutting material such as ALC or brick by the rotary blade by holding the handle provided on the motor housing and sliding the base on the cutting material. (For example, refer to Patent Document 1).

上記カッタにおいては、モータハウジングは合成樹脂で、ギヤハウジングとブレードケースとはアルミダイカスト等で夫々一体成型されて、モータハウジングとギヤハウジングとがボルト等で連結される場合が多い。この場合、成型上ギヤハウジングとブレードケースとの間に形成される仕切壁は両者の間に位置し、ギヤハウジングは、略中央にモータの出力軸の軸受部を突設して後方に開口する筒状となる。また、ギヤハウジングとモータハウジングとの間には、モータの出力軸に設けた軸流ファンからギヤハウジング側に流れるモータの冷却用空気を排出するための風窓が形成されている。   In the above cutter, the motor housing is made of synthetic resin, and the gear housing and the blade case are integrally formed by aluminum die casting or the like, and the motor housing and the gear housing are often connected by bolts or the like. In this case, the partition wall formed between the molded upper gear housing and the blade case is located between the two, and the gear housing projects rearward by projecting a bearing portion of the output shaft of the motor substantially at the center. It becomes cylindrical. In addition, a wind window is formed between the gear housing and the motor housing for discharging motor cooling air flowing from the axial fan provided on the output shaft of the motor to the gear housing side.

実開平４−５４６２５号公報Japanese Utility Model Publication No. 4-54625

このようなギヤハウジングの構造では、軸流ファンによる冷却用空気の排出側に深い凹部が形成されるため、ギヤハウジング内に冷却用空気が滞留して風窓からスムーズに排出されなくなり、必要な風量が確保されず、冷却効率の低下に繋がってしまう。また、風窓を介して小石等の異物がギヤハウジング内に侵入して不快な音を発生させたり、内部機構に損傷を与えたりするおそれもある。   In such a gear housing structure, since a deep recess is formed on the cooling air discharge side by the axial fan, the cooling air stays in the gear housing and is not smoothly discharged from the wind window, and the required air volume Is not secured, leading to a decrease in cooling efficiency. In addition, foreign objects such as pebbles may enter the gear housing through the wind window and generate unpleasant sounds, or damage internal mechanisms.

そこで、本発明は、上記のようにギヤハウジングとブレードケースとを一体成型したものであっても、軸流ファンによる冷却効率を好適に維持でき、異物による不具合も低減できるカッタを提供することを目的としたものである。   Therefore, the present invention provides a cutter that can suitably maintain the cooling efficiency by the axial fan and reduce defects due to foreign matter even when the gear housing and the blade case are integrally molded as described above. It is intended.

上記目的を達成するために、請求項１に記載の発明は、ギヤハウジングの開口に、風窓よりも前方位置でギヤハウジングの開口を閉塞するカバーを設けたことを特徴とするものである。
請求項２に記載の発明は、請求項１の構成において、侵入した異物をスムーズに排出するために、風窓を、少なくともギヤハウジングとモータハウジングとの下面側に設けたことを特徴とするものである。
請求項３に記載の発明は、請求項１又は２の構成において、風窓からの水等の吸込を防止するために、カバーの後面に、風窓における軸流ファンの回転方向上流側の端部に位置し、カバーの中心から周縁へ行くに従って風窓の周方向の長さを徐々に短くする突起を設けたことを特徴とするものである。 In order to achieve the above object, the invention described in claim 1 is characterized in that a cover that closes the opening of the gear housing at a position ahead of the wind window is provided at the opening of the gear housing.
According to a second aspect of the present invention, in the configuration of the first aspect, an air window is provided at least on a lower surface side of the gear housing and the motor housing in order to smoothly discharge the invading foreign matter. is there.
According to a third aspect of the present invention, in the configuration of the first or second aspect, in order to prevent inhalation of water or the like from the wind window, on the rear surface of the cover, on the upstream end of the axial flow fan in the wind window. A protrusion is provided which is positioned and gradually shortens the length of the wind window in the circumferential direction from the center of the cover to the periphery.

請求項１に記載の発明によれば、ギヤハウジングとブレードケースとを一体成型したものであっても、ギヤハウジングの開口がカバーによって閉塞されるため、冷却用空気が風窓からスムーズに排出可能となり、風量が増加して軸流ファンによる好適な冷却効率が維持できる。また、小石等の異物がギヤハウジング内に侵入して不快な音を発生させたり、内部機構に損傷を与えたりするおそれもない。
請求項２に記載の発明によれば、請求項１の効果に加えて、下面側に風窓を設けているので、異物が侵入しても下面側の風窓からスムーズに排出可能となる。
請求項３に記載の発明によれば、請求項１又は２の効果に加えて、突起によって風窓から排出される冷却用空気の流れを整流でき、風窓からの水等の吸込を効果的に防止可能となる。
According to the first aspect of the present invention, even if the gear housing and the blade case are integrally molded, since the opening of the gear housing is closed by the cover, the cooling air can be discharged smoothly from the wind window. As a result, the air volume is increased and a suitable cooling efficiency by the axial fan can be maintained. Further, there is no possibility that foreign matter such as pebbles will enter the gear housing and generate unpleasant noise, or damage the internal mechanism.
According to the second aspect of the invention, in addition to the effect of the first aspect, since the wind window is provided on the lower surface side, even if a foreign object enters, the air can be smoothly discharged from the wind window on the lower surface side.
According to the third aspect of the invention, in addition to the effect of the first or second aspect, the flow of the cooling air discharged from the wind window can be rectified by the protrusion, and the suction of water or the like from the wind window can be effectively prevented. It becomes possible.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、カッタの一例を示す正面図、図２はＡ−Ａ線、Ｂ−Ｂ線の夫々の断面図で、カッタ１は、平面視矩形状のベース２上に、ダイヤモンドホイール等の円盤状の回転刃４を装着した本体３を備えている。この本体３は、モータ８を内蔵した筒状のモータハウジング５の前方（図２の左側を前方とする。）に、後方へ開口する筒状に形成され、モータ８の出力軸９と、出力軸９から回転伝達されるスピンドル１０とを軸支するギヤハウジング６をボルト１１で連結してハウジングを形成している。このギヤハウジング６の前方には、ブレードケース７が一体に形成され、ブレードケース７内に突出したスピンドル１０の前端に回転刃４が直交状に装着されている。
１２は、モータハウジング５の側面で上方に形成されたハンドルで、トリガー１４を備えたスイッチ１３が内蔵されている。ここではモータハウジング５やハンドル１２はナイロン等の合成樹脂製で、ギヤハウジング６及びブレードケース７はアルミダイカスト製となっている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a cutter, FIG. 2 is a cross-sectional view of each of lines AA and BB, and the cutter 1 is a disk 2 such as a diamond wheel on a base 2 having a rectangular shape in plan view. A main body 3 on which a rotating blade 4 is mounted is provided. The main body 3 is formed in a cylindrical shape that opens rearward in the front of the cylindrical motor housing 5 in which the motor 8 is built (the left side in FIG. 2 is the front). A gear housing 6 that pivotally supports a spindle 10 that is rotationally transmitted from a shaft 9 is connected by a bolt 11 to form a housing. A blade case 7 is integrally formed in front of the gear housing 6, and the rotary blade 4 is mounted orthogonally on the front end of the spindle 10 protruding into the blade case 7.
A handle 12 is formed on the side of the motor housing 5 and includes a switch 13 including a trigger 14. Here, the motor housing 5 and the handle 12 are made of synthetic resin such as nylon, and the gear housing 6 and the blade case 7 are made of aluminum die casting.

また、ブレードケース７における切断方向前端（図１の左側）は、前後方向の軸１５によってベース２上で上下方向へ回転可能に連結される一方、ブレードケース７の切断方向後端は、ベース２上に立設した円弧状のガイド部材１６に沿った任意の位置でツマミネジ１７によって固定可能となっている。このツマミネジ１７による固定位置の調整で、ベース２から下方への回転刃４の突出量（切込量）が調整可能となる。   The blade case 7 has a front end in the cutting direction (left side in FIG. 1) connected to the base 2 so as to be rotatable in the vertical direction on the base 2, while the rear end in the cutting direction of the blade case 7 is the base 2. It can be fixed by a knob screw 17 at an arbitrary position along the arcuate guide member 16 standing on the top. By adjusting the fixing position with the knob screw 17, the protruding amount (cutting amount) of the rotary blade 4 from the base 2 downward can be adjusted.

一方、モータ８の出力軸９は、ギヤハウジング６とブレードケース７との間に形成される仕切壁１８の略中央に突設された筒状の軸受部１９内に突出して、ボールベアリング２０で軸支され、モータハウジング５の開口際には、モータハウジング５後方の図示しない吸込口から冷却用空気を取り込み、モータ８を通過させて前方へ排出する軸流ファン２１が直交状に設けられている。
また、仕切壁１８における軸受部１９の下方には、スピンドル１０をボールベアリングで軸支して軸受部１９と連通する第２軸受部２２が形成されている。この第２軸受部２２内でスピンドル１０に設けたギヤ２３が出力軸９のピニオンと噛合し、出力軸９の回転をスピンドル１０に伝達するものである。さらに、仕切壁１８には、スピンドル１０の前方部を軸支するボールベアリング２５を保持したベアリングリテーナ２４がブレードケース７側から組み付けられている。 On the other hand, the output shaft 9 of the motor 8 projects into a cylindrical bearing portion 19 projecting substantially at the center of a partition wall 18 formed between the gear housing 6 and the blade case 7, and is When the motor housing 5 is opened, an axial fan 21 is provided in an orthogonal shape that takes in cooling air from a suction port (not shown) at the rear of the motor housing 5 and passes it through the motor 8 to discharge it forward. Yes.
In addition, a second bearing portion 22 is formed below the bearing portion 19 in the partition wall 18 so as to communicate with the bearing portion 19 by pivotally supporting the spindle 10 with a ball bearing. A gear 23 provided on the spindle 10 in the second bearing portion 22 meshes with a pinion of the output shaft 9 and transmits the rotation of the output shaft 9 to the spindle 10. Further, a bearing retainer 24 that holds a ball bearing 25 that pivotally supports the front portion of the spindle 10 is assembled to the partition wall 18 from the blade case 7 side.

そして、ギヤハウジング６の後端で上下及び右側には、図３，４にも示すように、周方向に伸びる３つの切欠２６，２６・・が形成されて、モータハウジング５の組み付け状態で両ハウジング間に、軸流ファン２１から送られる冷却用空気を排出する風窓２７，２７・・を形成している。２８，２８・・は、風窓２７を仕切る格好でギヤハウジング６の最後方に突出してモータハウジング５の開口を受ける当接部である。
また、ギヤハウジング６には、カバー２９がネジ３０，３０によって取り付けられている。このカバー２９は、図５，６にも示すように、中央から外周へ行くに従って徐々に低くなる傾斜を付与した皿状で、中央には、軸受部１９及び第２軸受部２２との外周に嵌合してその干渉を防ぐ大逃げ部３１が、外周縁には、ギヤハウジング６の当接部２８に嵌合する小逃げ部３２，３２・・が夫々形成され、ギヤハウジング６への取付状態で、外周縁が切欠２６の前端側に位置してギヤハウジング６の開口を閉塞可能となっている。さらに、カバー２９の外周縁で各小逃げ部３２に隣接する位置には、上下及び右側の風窓２７をカバー２９の中心から出口側へ行くに従って徐々に周方向へ狭くする三角形状の突起３３，３３・・が突設されている。この突起３３は、上方及び右側の風窓２７に対しては、軸流ファン２１の回転方向（図３での右回転方向）で上流側の端部に位置し、下方の風窓２７に対しては、両端部に位置するように設けられている。 As shown in FIGS. 3 and 4, three notches 26, 26... Extending in the circumferential direction are formed at the rear end of the gear housing 6 at the top, bottom, and right sides. Wind windows 27, 27... For discharging cooling air sent from the axial fan 21 are formed between the housings. 28, 28... Are contact portions that partition the wind window 27 and protrude toward the rear of the gear housing 6 to receive the opening of the motor housing 5.
A cover 29 is attached to the gear housing 6 with screws 30 and 30. As shown in FIGS. 5 and 6, the cover 29 has a dish-like shape with a slope that gradually decreases from the center to the outer periphery. In the center, the cover 29 has an outer periphery with the bearing portion 19 and the second bearing portion 22. A large relief portion 31 that is fitted to prevent interference is formed, and small relief portions 32, 32,... That are fitted to the contact portion 28 of the gear housing 6 are formed on the outer peripheral edge. In this state, the outer peripheral edge is located on the front end side of the notch 26 so that the opening of the gear housing 6 can be closed. Further, at the position adjacent to each small escape portion 32 on the outer peripheral edge of the cover 29, triangular projections 33 for gradually narrowing the upper and lower and right wind windows 27 in the circumferential direction from the center of the cover 29 toward the outlet side, 33 ... are projected. This protrusion 33 is located at the upstream end in the rotational direction of the axial fan 21 (the right rotational direction in FIG. 3) with respect to the upper and right wind windows 27, and with respect to the lower wind window 27. , So as to be located at both ends.

以上の如く構成されたカッタ１においては、ハンドル１２に設けられたトリガー１４を押し込んでスイッチ１３をＯＮさせると、モータ８が駆動して出力軸９が回転し、ギヤ２３を介してスピンドル１０及び回転刃４を回転させる。よって、ベース２をＡＬＣやレンガ等の被切断材上でスライドさせれば、回転刃４による切断が可能となる。
このとき、出力軸９の回転によって軸流ファン２１が回転し、モータハウジング５に冷却用空気を取り込んでモータ８を冷却した後、ギヤハウジング６側へ排出することになるが、軸流ファン２１の排出側近傍にカバー２９が位置するため、冷却用空気はカバー２９の外面に沿って滞留することなく外周側へ導かれ、上下及び右側の風窓２７から排出される。また、上方の風窓２７から小石等の異物が侵入しても、そのまま下方の風窓２７から落下し、本体３内にとどまることはない。 In the cutter 1 configured as described above, when the switch 14 is turned on by pushing the trigger 14 provided on the handle 12, the motor 8 is driven to rotate the output shaft 9, and the spindle 10 and the The rotary blade 4 is rotated. Therefore, if the base 2 is slid on a material to be cut such as ALC or brick, cutting with the rotary blade 4 becomes possible.
At this time, the axial fan 21 is rotated by the rotation of the output shaft 9, the cooling air is taken into the motor housing 5 to cool the motor 8, and then discharged to the gear housing 6 side. Since the cover 29 is positioned in the vicinity of the discharge side, the cooling air is guided along the outer surface of the cover 29 to the outer peripheral side and is discharged from the upper and lower and right wind windows 27. Further, even if a foreign object such as a pebble enters from the upper wind window 27, it falls from the lower wind window 27 as it is and does not stay in the main body 3.

そして、風窓２７からの排気の際、軸流ファン２１の回転方向上流側では、当接部２８の側面近傍で乱流が生じて負圧となりやすく、水を利用した切断を行う際には当該部位から水を吸い込んでしまうおそれがある。しかし、ここでは当該部位に突起３３が設けられているため、整流作用が発揮され、負圧を発生させることなくスムーズに冷却用空気の排出が可能となっている。なお、ここでは大逃げ部３１の形成により、下方の風窓２７においては軸流ファン２１の回転方向下流側の端部でも負圧が発生することから、当該部位にも突起３３を設けている。   When exhausting from the wind window 27, turbulent flow is likely to occur near the side surface of the contact portion 28 on the upstream side in the rotation direction of the axial fan 21, and negative pressure tends to occur. There is a risk of inhaling water from the site. However, since the protrusions 33 are provided at the portions here, the rectifying action is exhibited, and the cooling air can be discharged smoothly without generating a negative pressure. Here, since the large escape portion 31 is formed, a negative pressure is generated at the downstream end of the axial fan 21 in the rotation direction of the axial fan 21, so that the projection 33 is also provided at that portion.

このように、上記形態のカッタ１によれば、ギヤハウジング６の開口に、風窓２７よりも前方位置でギヤハウジング６の開口を閉塞するカバー２９を設けたことで、ギヤハウジング６とブレードケース７とを一体成型したものであっても、冷却用空気が風窓２７からスムーズに排出可能となり、風量が増加して軸流ファン２１による好適な冷却効率が維持できる。また、小石等の異物がギヤハウジング６内に侵入して不快な音を発生させたり、内部機構に損傷を与えたりするおそれもない。
特にここでは、風窓２７をギヤハウジング６の下面側に設けているので、上側の風窓２７から異物が侵入しても下面側の風窓２７からスムーズに排出可能となる。
さらに、カバー２９の後面に突起３３を設けたことで、風窓２７から排出される冷却用空気の流れを整流でき、風窓２７からの水等の吸込を効果的に防止可能となる。 Thus, according to the cutter 1 of the said form, by providing the cover 29 which obstruct | occludes the opening of the gear housing 6 in the opening of the gear housing 6 in the front position rather than the wind window 27, the gear housing 6 and the blade case 7 are provided. Can be discharged smoothly from the wind window 27, the air volume is increased, and a suitable cooling efficiency by the axial fan 21 can be maintained. Further, there is no possibility that foreign matter such as pebbles enter the gear housing 6 to generate an unpleasant sound or damage the internal mechanism.
In particular, here, since the wind window 27 is provided on the lower surface side of the gear housing 6, even if a foreign object enters from the upper wind window 27, it can be smoothly discharged from the lower wind window 27.
Furthermore, by providing the protrusion 33 on the rear surface of the cover 29, the flow of cooling air discharged from the wind window 27 can be rectified, and suction of water or the like from the wind window 27 can be effectively prevented.

なお、上記形態では、風窓を右側にも設けているが、これを省略して上下のみ或いは下方のみとしてもよい。また、下方の風窓では両端に突起を設けているが、軸流ファンの回転方向下流側に負圧の発生がなければ他の風窓と同様に上流側の端部のみに設ければよい。
さらに、突起の形状も三角形状に限らず、板状のリブを傾斜状に立設する等の変更は可能である。
その他、カバーの形状は、傾斜のない扁平な板状としたり、軸受部等の干渉がなければ逃げ部を省略したりできる。勿論ギヤハウジングへの取付構造も、ネジ止め以外に、カバーに設けた係止片をギヤハウジングに設けた凹部に係合させたり、ギヤハウジングとモータハウジングとの間で挟持させたり等の種々の設計変更が考えられる。 In addition, in the said form, although the wind window is provided also on the right side, this is abbreviate | omitted and it is good also as only upper and lower sides. Further, the lower wind window is provided with protrusions at both ends. However, as long as no negative pressure is generated on the downstream side in the rotational direction of the axial fan, it may be provided only at the upstream end as in the other wind windows.
Further, the shape of the protrusion is not limited to a triangular shape, and changes such as standing a plate-like rib in an inclined shape are possible.
In addition, the shape of the cover can be a flat plate with no inclination, or the escape portion can be omitted if there is no interference from the bearing portion or the like. Of course, the mounting structure to the gear housing is not limited to screwing, but a locking piece provided on the cover is engaged with a recess provided on the gear housing, or is sandwiched between the gear housing and the motor housing. A design change is possible.

そして、上記形態では、ギヤハウジングの端部に切欠を設けて風窓を形成しているが、透孔を設けて風窓を形成したものでも差し支えない。また、ギヤハウジング側に限らず、モータハウジングの端部に切欠や透孔を設けて風窓を形成した場合や、ギヤハウジングとモータハウジングとの双方の端部に切欠を設けて風窓を形成した場合でも、同様にカバーによる冷却用空気のガイドは可能である。
And in the said form, although the notch was provided in the edge part of the gear housing and the wind window was formed, what formed the through-hole and formed the wind window may be used. Also, not only on the gear housing side, but also when a notch or through hole is provided at the end of the motor housing, or when a notch is provided at both ends of the gear housing and the motor housing to form an air window However, the cooling air can be guided by the cover as well.

カッタの正面図である。It is a front view of a cutter. 上がＡ−Ａ線、下がＢ−Ｂ線の断面図である。The top is a cross-sectional view taken along line AA and the bottom is taken along line BB. ギヤハウジングを後方から見た説明図である。It is explanatory drawing which looked at the gear housing from back. ギヤハウジングの斜視図である。It is a perspective view of a gear housing. カバーの説明図で、左が正面、右が背面、下が断面を夫々示す。It is explanatory drawing of a cover, the left is a front, the right is a back, and the bottom shows a cross section, respectively. カバーの斜視図である。It is a perspective view of a cover.

符号の説明Explanation of symbols

１・・カッタ、２・・ベース、３・・本体、４・・回転刃、５・・モータハウジング、６・・ギヤハウジング、７・・ブレードケース、８・・モータ、９・・出力軸、１０・・スピンドル、１８・・仕切壁、１９・・軸受部、２１・・軸流ファン、２２・・第２軸受部、２６・・切欠、２７・・風窓、２８・・当接部、２９・・カバー、３３・・突起。   1 .... Cutter, 2 .... Base, 3 .... Main body, 4 .... Rotating blade, 5 .... Motor housing, 6 .... Gear housing, 7 .... Blade case, 8 .... Motor, 9 .... Output shaft, 10 .... Spindle, 18 .... Partition wall, 19 .... Bearing part, 21 ... Axial fan, 22 ... Second bearing part, 26 ... Notch, 27 ... Wind window, 28 ... Contact part, 29 ..Cover, 33..Protrusion.

Claims (3)

モータを内蔵した筒状のモータハウジングの前方に、後方へ開口する筒状に形成され、前記モータの出力軸と、前記出力軸から回転伝達されるスピンドルとを軸支するギヤハウジングを連結し、前記ギヤハウジングとモータハウジングとの間に、前記出力軸に固着された軸流ファンから前方へ送られる前記モータの冷却用空気を排出する風窓を設ける一方、前記ギヤハウジングの前方にブレードケースを一体成型して、前記ブレードケース内に突出させた前記スピンドルの前端に回転刃を装着してなるカッタであって、
前記ギヤハウジングの開口に、前記風窓よりも前方位置で前記開口を閉塞するカバーを設けたことを特徴とするカッタ。 A cylindrical motor housing with a built-in motor is formed in a cylindrical shape that opens rearward, and a gear housing that supports the output shaft of the motor and a spindle that is rotated and transmitted from the output shaft is connected. A wind window is provided between the gear housing and the motor housing to discharge the cooling air for the motor sent forward from an axial fan fixed to the output shaft, and a blade case is integrated with the front of the gear housing. A cutter comprising a rotary blade attached to the front end of the spindle that is molded and protruded into the blade case,
The cutter according to claim 1, wherein a cover for closing the opening at a position in front of the wind window is provided at the opening of the gear housing. 風窓を、少なくとも前記ギヤハウジングとモータハウジングとの下面側に設けたことを特徴とする請求項１に記載のカッタ。   The cutter according to claim 1, wherein an air window is provided at least on a lower surface side of the gear housing and the motor housing. カバーの後面に、風窓における軸流ファンの回転方向上流側の端部に位置し、前記カバーの中心から周縁へ行くに従って前記風窓の周方向の長さを徐々に短くする突起を設けたことを特徴とする請求項１又は２に記載のカッタ。   Provided on the rear surface of the cover is a projection that is located at the end of the wind window on the upstream side in the rotational direction of the axial fan and that gradually decreases the circumferential length of the wind window from the center of the cover to the periphery. The cutter according to claim 1 or 2, characterized in that:
JP2007209918A 2007-08-10 2007-08-10 Cutter Pending JP2009039844A (en)

Priority Applications (2)

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JP2007209918A JP2009039844A (en) 2007-08-10 2007-08-10 Cutter
CN2008101323796A CN101362363B (en) 2007-08-10 2008-07-16 Cutting tool

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JP2007209918A JP2009039844A (en) 2007-08-10 2007-08-10 Cutter

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JPH08336803A (en) * 1995-04-14 1996-12-24 Makita Corp Ventilating structure for power tool
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CN101362363B (en) 2011-08-17

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