JP4153382B2 - Portable brush cutter - Google Patents

Portable brush cutter Download PDF

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JP4153382B2
JP4153382B2 JP2003292017A JP2003292017A JP4153382B2 JP 4153382 B2 JP4153382 B2 JP 4153382B2 JP 2003292017 A JP2003292017 A JP 2003292017A JP 2003292017 A JP2003292017 A JP 2003292017A JP 4153382 B2 JP4153382 B2 JP 4153382B2
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cutting blade
brush cutter
shaft
portable brush
handle
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JP2005058080A (en
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光雄 島田
彬 長島
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Kyoritsu Co Ltd
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Kyoritsu Co Ltd
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Description

本発明は、操作桿の前端部に刈刃、歯車ケース、安全カバー等からなる刈刃機構部が設けられ、前記操作桿の後端部に、前記刈刃を前記操作桿に内装された伝動軸を介して駆動するための２サイクル内燃エンジン等の原動機が取り付けられてなる携帯型刈払機に関する。   According to the present invention, a cutting blade mechanism portion including a cutting blade, a gear case, a safety cover, and the like is provided at a front end portion of the operating rod, and the cutting blade is housed in the operating rod at a rear end portion of the operating rod. The present invention relates to a portable brush cutter to which a prime mover such as a two-cycle internal combustion engine for driving through a shaft is attached.

一般に、携帯型刈払機は、直線状の操作桿の前端部に刈刃、歯車ケース、安全カバー等からなる刈刃機構部が設けられ、前記操作桿の後端部に、前記刈刃を前記操作桿に内装された伝動軸を介して駆動するための原動機（例えば、小型空冷２サイクル内燃エンジン）が取り付けられる。また、前記操作桿には、刈払作業を行うべく前記刈刃機構部を左右に振ったり上下動させるためのハンドル（又はグリップ）が設けられる。このハンドルとして現在主流となっているのは、下記特許文献１等に所載の如くのＵ形ハンドルであるが、他に、下記特許文献２に所載の如くに、前記操作桿に前後一対のグリップを設ける場合もあり、さらに、下記特許文献３に所載のように、前記操作桿の後端部に外嵌される外嵌部及び把持部を有する側面視横倒しＶ字状ないしアイロン形のハンドル（以下、Ｖ形ハンドルと称す）が知られている。該Ｖ形ハンドルを備えた携帯型刈払機においては、通常、前記操作桿における前記Ｖ形ハンドルの前側に側方に突出する副ハンドルが配備される。   In general, a portable brush cutter is provided with a cutting blade mechanism portion including a cutting blade, a gear case, a safety cover, and the like at a front end portion of a linear operation rod, and the cutting blade is disposed at a rear end portion of the operation rod. A prime mover (for example, a small air-cooled two-cycle internal combustion engine) for driving through a transmission shaft built in the operating rod is attached. Further, the operating rod is provided with a handle (or grip) for swinging the moving blade mechanism part to the left or right or moving it up and down in order to perform a brushing operation. A U-shaped handle as described in the following Patent Document 1 and the like is currently mainstream as this handle, but in addition, as described in Patent Document 2 below, In addition, as described in Patent Document 3 below, the grip has a fitting portion and a gripping portion that are fitted on the rear end portion of the operation rod. Are known (hereinafter referred to as V-shaped handles). In a portable brush cutter provided with the V-shaped handle, a sub handle that protrudes laterally is usually provided on the front side of the V-shaped handle in the operating rod.

このＶ形ハンドルを備えた携帯型刈払機では、前記把持部を手で握って機体を吊持したとき、前記刈刃機構部が下で前記内燃エンジンが上の傾斜姿勢となるとともに、機体長さ方向の重心位置がちょうど前記把持部辺りとなり、さらに、前記把持部及び前記刈刃が略水平となるので、そのままの楽な姿勢で刈払作業を行うことができ、操作性、作業性に優れる。   In the portable brush cutter provided with the V-shaped handle, when the body is suspended by grasping the grip portion with a hand, the internal combustion engine is in an inclined posture with the cutting blade mechanism portion down, and the length of the body The position of the center of gravity in the vertical direction is just around the gripping part, and the gripping part and the cutting blade are substantially horizontal, so that the mowing work can be performed in an easy posture as it is, and operability and workability are improved. Excellent.

また、前記携帯型刈払機においては、前記内燃エンジンから前記ハンドルに振動が伝播すると、操作性が低下するため、通常、前記ハンドルと前記内燃エンジン又は前記操作桿との間に防振部材を介装してハンドル防振を行っている。   In the portable brush cutter, when vibration propagates from the internal combustion engine to the handle, the operability deteriorates. Therefore, a vibration isolating member is usually interposed between the handle and the internal combustion engine or the operating rod. The handle is vibration-proof.

一方、前記操作桿は、前記特許文献１、２にも見られるように、真っ直ぐ（直桿）のものが用いられるのが普通である。この場合、前記刈刃は地面に平行な面内で回転させる必要があるため、前記刈刃の回転軸と前記操作桿に内装された伝動軸とは所定の交差角度を持つことになる。そのため、前記伝動軸から前記刈刃への動力伝達には、従来、一対の傘歯車を収容した歯車ケースが用いられ、前記刈刃の回転方向が前記伝動軸の回転方向とは逆（刈刃が上から見て左回り）になっている。   On the other hand, as described in Patent Documents 1 and 2, the operation rod is usually a straight one. In this case, since the cutting blade needs to be rotated in a plane parallel to the ground, the rotating shaft of the cutting blade and the transmission shaft built in the operating rod have a predetermined crossing angle. Therefore, a gear case that accommodates a pair of bevel gears is conventionally used for power transmission from the transmission shaft to the cutting blade, and the rotation direction of the cutting blade is opposite to the rotation direction of the transmission shaft (cutting blade). Is counterclockwise when viewed from above.

それに対し、前記特許文献３に所載のＶ形ハンドルを持つ携帯型刈払機では、前記伝動軸としてフレキシブルシャフトが用いられるとともに、前記操作桿の前端側が湾曲せしめられた曲桿状にして前記伝動軸が前記刈刃の回転軸に直結されているので、逆回転する内燃エンジンが必要となる。   On the other hand, in the portable brush cutter having the V-shaped handle described in Patent Document 3, a flexible shaft is used as the transmission shaft, and the transmission shaft has a curved shape in which the front end side of the operation rod is curved. Is directly connected to the rotary shaft of the cutting blade, an internal combustion engine that rotates in reverse is required.

さらに、前記特許文献１に所載の携帯型刈払機では、前記刈刃の回転軸を両持ち支持するようにされている。
特許第３１７６５７９号公報（第１〜４頁、図１〜図４） 特開平９−２１５４２１号公報（第１〜６頁、図１〜図１５） 実開昭５３−１０７５３１号公報（第１〜２頁、図１〜図６） Furthermore, in the portable brush cutter described in Patent Document 1, the rotary shaft of the cutting blade is supported at both ends.
Japanese Patent No. 3176579 (pages 1 to 4, FIGS. 1 to 4) Japanese Patent Laid-Open No. 9-215421 (pages 1 to 6, FIGS. 1 to 15) Japanese Utility Model Publication No. 53-107531 (pages 1 and 2, FIGS. 1 to 6)

前記した特許文献１、２に所載の如くの、現在一般的に用いられている直桿状操作桿にＵ形ハンドル又は前後一対のグリップを設けている携帯型刈払機用の内燃エンジンをそのまま使用して、ハンドルとして前記Ｕ形ハンドル（又は前後一対のグリップ）に代えて、前記Ｖ形ハンドルを使うことが考えられている。この場合、従来のＶ形ハンドル及び内燃エンジンをそのまま組み付けることはできず、その形状等に格別の配慮が要求され、また、ハンドル防振にも工夫が必要とされる。   As described in Patent Documents 1 and 2 above, an internal combustion engine for a portable brush cutter in which a U-shaped handle or a pair of front and rear grips are provided on a straight rod-like operation rod that is generally used at present is used as it is. Then, it is considered to use the V-shaped handle instead of the U-shaped handle (or a pair of front and rear grips) as a handle. In this case, the conventional V-shaped handle and the internal combustion engine cannot be assembled as they are, and special consideration is required for the shape and the like, and a device is also required for vibration isolation of the handle.

さらに、従来の携帯型刈払機では、刈刃機構部に、高価な傘歯車が対にして用いられていることや、前記刈刃の回転軸を両持ち支持していること等もあって、歯車ケースを含む重量や容積が大きく、製造コストが高いという問題があった。   Furthermore, in the conventional portable brush cutter, there are a pair of expensive bevel gears used in the cutting blade mechanism, and the support of the rotary shaft of the cutting blade. There was a problem that the weight and volume including the gear case were large and the manufacturing cost was high.

本発明の目的とするところは、一般的に用いられている刈払機用内燃エンジンを共用できるようにせしめるとともに、ハンドル及び防振部材が合理的に組み付けられて、操作性、作業性に優れた携帯型刈払機を提供することにある。
本発明の他の目的は、刈刃機構部の重量軽減化、コンパクト化、低コスト化等を図ることにある。 The object of the present invention is to make it possible to share a commonly used internal combustion engine for a brush cutter, and because a handle and a vibration isolating member are rationally assembled, it is excellent in operability and workability. It is to provide a portable brush cutter.
Another object of the present invention is to reduce the weight, size and cost of the cutting blade mechanism.

前記の目的を達成すべく、本発明に係る携帯型刈払機は、基本的には、操作桿の前端部に刈刃、歯車ケース、安全カバー等からなる刈刃機構部が設けられ、前記操作桿の後端部に、前記刈刃を前記操作桿に内装された伝動軸を介して駆動するための原動機が取り付けられる。 In order to achieve the above object, the portable brush cutter according to the present invention is basically provided with a cutting blade mechanism portion including a cutting blade , a gear case, a safety cover, and the like at the front end portion of the operation rod. A prime mover for driving the cutting blade via a transmission shaft built in the operating rod is attached to the rear end of the rod.

そして、前記操作桿の後端部に、前記原動機に隣接して、前記後端部に外嵌される外嵌部及び把持部を有するハンドルが取り付けられ、該ハンドルに、前記原動機の出力伝動連結部、及び、前記原動機と前記ハンドルとの間に配在される防振部材を収納し得る収納部が設けられている。 A handle having an outer fitting portion and a gripping portion fitted to the rear end portion is attached to the rear end portion of the operating rod adjacent to the prime mover, and the output transmission connection of the prime mover is attached to the handle. parts and, housing part is provided, can hold the vibration isolating member Zaisa distribution between the motor and the handle.

そして、前記伝動軸としてフレキシブルシャフトが用いられるとともに、前記操作桿の前端側が湾曲せしめられて前記伝動軸の前端部と前記刈刃の回転軸とが平行に配在されていることを特徴としている。   In addition, a flexible shaft is used as the transmission shaft, and the front end side of the operating rod is curved, and the front end portion of the transmission shaft and the rotary shaft of the cutting blade are arranged in parallel. .

好ましい態様では、前記操作桿の前端部に前記歯車ケースが取り付けられ、該歯車ケース内に、前記伝動軸の前端部が駆動上連結される駆動歯車と、該駆動歯車に噛合する前記刈刃の回転軸となる従動歯車と、が配在されていることを特徴としている。   In a preferred aspect, the gear case is attached to the front end portion of the operating rod, and a driving gear in which the front end portion of the transmission shaft is connected for driving in the gear case, and the cutting blade meshing with the driving gear. A driven gear serving as a rotation shaft is arranged.

前記刈刃の回転軸は、好ましくは、前記歯車ケースに片持ち支持され、また、前記安全カバーは、好ましくは、前記刈刃の上面及び外周部を覆うように配在されて、前記歯車ケースに下面側から螺合せしめられるねじ類により固定される。   The rotating shaft of the cutting blade is preferably cantilevered by the gear case, and the safety cover is preferably arranged so as to cover the upper surface and the outer periphery of the cutting blade, It is fixed by screws that are screwed together from the lower surface side.

前記の如くの構成とされた本発明に係る携帯型刈払機においては、操作桿の後端部に外嵌される外嵌部及び把持部を有するハンドルに、前記原動機の出力伝動連結部、及び、前記原動機と前記ハンドルとの間に配在される防振部材を収納し得る収納部が設けられているので、前記ハンドル及び防振部材を、前記操作桿に合理的に組み付けることができ、その結果、操作性、作業性が向上する。   In the portable brush cutter according to the present invention configured as described above, an output transmission connecting portion of the prime mover is attached to a handle having an outer fitting portion and a grip portion that are fitted to the rear end portion of the operating rod, and In addition, since a storage portion is provided that can store a vibration isolating member disposed between the prime mover and the handle, the handle and the vibration isolating member can be reasonably assembled to the operating rod. As a result, operability and workability are improved.

また、前記伝動軸としてフレキシブルシャフトが用いられるとともに、前記操作桿の前端側が湾曲せしめられて前記伝動軸の前端部と前記刈刃の回転軸とが平行に配在されていることにより、歯車として高価な傘歯車に代えて安価な平歯車を用いることができるとともに、直桿型用内燃エンジンの流用が可能となる。このため、前記刈刃の回転軸が前記歯車ケースに片持ち支持されていることと相まって、前記刈刃機構部の重量軽減化、コンパクト化、低コスト化等を図ることができる。   In addition, a flexible shaft is used as the transmission shaft, and the front end side of the operating rod is curved so that the front end portion of the transmission shaft and the rotation shaft of the cutting blade are arranged in parallel, thereby providing a gear. An inexpensive spur gear can be used in place of an expensive bevel gear, and a straight-line internal combustion engine can be used. For this reason, coupled with the fact that the rotating shaft of the cutting blade is cantilevered by the gear case, the cutting blade mechanism can be reduced in weight, reduced in size, reduced in cost, and the like.

さらに、前記安全カバーが前記刈刃の上面及び外周部を覆うように配在されて、前記歯車ケースに下面側から螺合せしめられるねじ類により固定されていることにより、前記ねじ類は、前記刈刃を取り外さないと緩めることができなくなるので、前記安全カバーを容易には取り外すことができない。このため、作業者は、常時安全カバーを付けたまま刈払作業を行わざるを得ず、これによって作業の安全性を確保できる。   Further, the safety cover is disposed so as to cover the upper surface and the outer peripheral portion of the cutting blade, and is fixed by screws that are screwed into the gear case from the lower surface side. The safety cover cannot be removed easily because it cannot be loosened unless the cutting blade is removed. For this reason, the operator is forced to perform the mowing work with the safety cover always attached, thereby ensuring the safety of the work.

以下、本発明の実施の形態を図面を参照しながら説明する。
図１は、本発明に係る携帯型刈払機の第一実施形態を示す全体概略側面図である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall schematic side view showing a first embodiment of a portable brush cutter according to the present invention.

図示の携帯型刈払機１は、前端側が湾曲せしめられた曲桿型操作桿３を有し、該操作桿３の前端部３ａに、回転鋸刃等の刈刃６、歯車ケース７、安全カバー８等からなる刈刃機構部５が設けられ、前記操作桿３の後端部３ｂに、前記刈刃６を前記操作桿３に内装されたフレキシブルシャフトからなる伝動軸４（図２、図３参照）を介して駆動するための原動機としての小型空冷２サイクル内燃エンジン１０が取り付けられている。   The illustrated portable brush cutter 1 has a curved operation rod 3 whose front end is bent, and a cutting blade 6 such as a rotary saw blade, a gear case 7, a safety cover are provided on the front end 3 a of the operation rod 3. 8 and the like, and a transmission shaft 4 (FIGS. 2 and 3) including a flexible shaft in which the cutting blade 6 is housed in the operation rod 3 is provided at the rear end portion 3b of the operation rod 3. A small air-cooled two-cycle internal combustion engine 10 is mounted as a prime mover for driving through a reference.

該エンジン１０は、例えばＵ形ハンドルが用いられた直桿型刈払機に使用されているもので、その前面側は、図２に示される如くに、外装ケース１２の前面中央部１２Ａが前方に若干突出せしめられるとともに、出力伝動連結部とされる出力軸１１が遠心クラッチドラム１１ａから前方に突出せしめられており、該出力軸１１には前記伝動軸４が一体回動可能に駆動上連結されている。前記外装ケース１２の前記前面中央部１２Ａには、前記出力軸１１をベアリング１６を介して回動自在に支持する円環状の支持隔壁１５が設けられている。前記前面中央部１２Ａにおける前記支持隔壁１５より前側は、ゴム等からなるドーナツ状の防振部材１７の後半部が嵌め込まれる収納部１８となっている。   The engine 10 is used in, for example, a straight type brush cutter using a U-shaped handle. As shown in FIG. 2, the front center portion 12A of the outer case 12 is located on the front side. An output shaft 11 that is slightly protruded and serves as an output transmission connecting portion is protruded forward from the centrifugal clutch drum 11a, and the transmission shaft 4 is connected to the output shaft 11 so as to be integrally rotatable. ing. An annular support partition 15 that rotatably supports the output shaft 11 via a bearing 16 is provided at the front central portion 12A of the outer case 12. A front side of the front center portion 12A from the support partition wall 15 is a storage portion 18 into which a rear half portion of a donut-shaped vibration isolating member 17 made of rubber or the like is fitted.

一方、前記操作桿３の前記後端部３ｂには、前記エンジン１０に隣接して、前記後端部３ｂに外嵌される外嵌部２１及び把持部２２を有する、側面視横倒しＶ字状ないしアイロン形のハンドル（Ｖ形ハンドル）２０が取り付けられている。また、前記操作桿３における前記Ｖ形ハンドル２０の前側において左側方に突出する副ハンドル２８が配備されている。   On the other hand, the rear end portion 3b of the operating rod 3 has an outer fitting portion 21 and a grip portion 22 that are fitted to the rear end portion 3b adjacent to the engine 10, and is laterally laid down in a V shape. Or an iron-shaped handle (V-shaped handle) 20 is attached. In addition, a sub handle 28 protruding leftward is provided on the front side of the V-shaped handle 20 in the operation rod 3.

前記Ｖ形ハンドル２０は、左右二つ割り構造となっており、前記外嵌部２１の前端部２１ａは、ボルト２９、２９により前記操作桿３に締め付け固定されている。斜上方へ立ち上がった前記把持部２２には、前記内燃エンジン１０に備えられる図示しない気化器スロットル弁の開度を制御するためのスロットルレバー２６やエンジン停止スイッチ２７等が組み込まれている。   The V-shaped handle 20 has a left and right split structure, and the front end 21 a of the outer fitting portion 21 is fastened and fixed to the operating rod 3 by bolts 29 and 29. A throttle lever 26, an engine stop switch 27, and the like for controlling the opening degree of a carburetor throttle valve (not shown) provided in the internal combustion engine 10 are incorporated in the grip portion 22 that rises obliquely upward.

そして、前記Ｖ形ハンドル２０の後端部２１ｂには、前記出力伝動連結部とされる前記出力軸１１及び前記防振部材１７の前半部を収納し得る収納部２５が設けられている。この収納部２５には、ボルト穴２５ａ、２５ａが設けられた支持隔壁２５Ａが設けられており、該収納部２５における前記ボルト穴２５ａ、２５ａより後側に前記防振部材１７の前半部が嵌め込まれている。   The rear end portion 21b of the V-shaped handle 20 is provided with a storage portion 25 that can store the output shaft 11 serving as the output transmission connecting portion and the front half portion of the vibration isolation member 17. The storage portion 25 is provided with a support partition wall 25A provided with bolt holes 25a, 25a, and the front half of the vibration isolation member 17 is fitted behind the bolt holes 25a, 25a in the storage portion 25. It is.

前記防振部材１７は、前記ボルト穴２５ａから該防振部材１７を貫通して前記外装ケース１２側の収納部１５に設けられた雌ねじ部１５ａに螺合せしめられた複数本のボルト２４、２４、・・・により、前記エンジン１０と前記Ｖ形ハンドル２０とに跨って、適度に締め付けられて介装されている。言い換えれば、前記Ｖ形ハンドル２０は、前記防振部材１７を介して前記エンジン１０にボルト２４、２４、・・・で連結されており、前記Ｖ形ハンドル２０の後端面と前記外装ケース１２（の前記前面中央部）の前端面との間には、適度の相対変位を許容する隙間Ｓが形成されている。   The anti-vibration member 17 passes through the anti-vibration member 17 from the bolt hole 25a and is screwed into a plurality of bolts 24, 24 screwed into a female screw portion 15a provided in the storage portion 15 on the exterior case 12 side. ,... Are interposed between the engine 10 and the V-shaped handle 20 by being appropriately tightened. In other words, the V-shaped handle 20 is connected to the engine 10 by the bolts 24, 24,... Via the vibration isolation member 17, and the rear end surface of the V-shaped handle 20 and the outer case 12 ( A gap S that allows a moderate relative displacement is formed between the front end surface of the front central portion).

このように前記Ｖ形ハンドル２０と前記エンジン１０との間に前記防振部材１７を介装することにより、前記エンジン１０から前記Ｖ形ハンドル２０に振動が伝播し難くなり、操作性、作業性が向上する。   As described above, the vibration isolating member 17 is interposed between the V-shaped handle 20 and the engine 10, so that vibration is difficult to propagate from the engine 10 to the V-shaped handle 20, and operability and workability are improved. Will improve.

一方、前端側が湾曲せしめられた前記操作桿３の前端部には、前記刈刃機構部５が取着されており、前記操作桿３に内装された前記フレキシブルシャフトからなる伝動軸４の前端側も、前記操作桿３のカーブに沿うように湾曲せしめられている。そして、図３に示される如くに、前記伝動軸４の前端部４ａ（の回転軸線Ｏａ）と前記刈刃６の回転軸線Ｏｂとが平行に配在されている。   On the other hand, the cutting blade mechanism portion 5 is attached to the front end portion of the operation rod 3 whose front end side is bent, and the front end side of the transmission shaft 4 composed of the flexible shaft housed in the operation rod 3. Is also curved along the curve of the operating rod 3. As shown in FIG. 3, the front end portion 4 a (rotational axis Oa) of the transmission shaft 4 and the rotational axis Ob of the cutting blade 6 are arranged in parallel.

詳細には、前記歯車ケース７は、上側筒状部７Ａと、該上側筒状部７Ａに対して前方へ偏心せしめられた下側筒状部７Ｂと、からなっており、前記操作桿３の前記前端部３ａに前記上側筒状部７Ａが外嵌されて、止めねじ３９で取付固定されている。前記上側筒状部７Ａには、前記伝動軸４の前記前端部４ａが挿入されて一体回動可能に取り付けられた駆動歯車３１（の軸部３１Ａ）が、ベアリング３３、３３を介して回動自在に収納されている。また、前記下側筒状部７Ｂには、前記駆動歯車３１に噛合する前記刈刃６の回転軸となる従動歯車３２（の軸部３２Ａ）が、ベアリング３４、３４を介して片持ち支持されて、回動自在に収納されている。   Specifically, the gear case 7 includes an upper cylindrical portion 7A and a lower cylindrical portion 7B that is eccentric to the front with respect to the upper cylindrical portion 7A. The upper cylindrical portion 7A is externally fitted to the front end portion 3a, and is fixed by a set screw 39. A drive gear 31 (the shaft portion 31A) attached to the upper cylindrical portion 7A so as to be integrally rotatable with the front end portion 4a of the transmission shaft 4 being pivoted through bearings 33, 33. It is stored freely. The lower cylindrical portion 7B is cantilevered via bearings 34 and 34 with a driven gear 32 (a shaft portion 32A) serving as a rotation shaft of the cutting blade 6 meshing with the drive gear 31. And is rotatably stored.

前記刈刃６は、前記従動歯車３２の前記軸部３２Ａにスプライン嵌合せしめられた上側押さえ部材３６と下側押さえ部材３７とで上下から挟持された状態で、前記軸部３２Ａの下端部から形成された雌ねじ部３２ａに螺合せしめられたボルト３５により、前記従動歯車３２に一体回動可能に取り付けられている。従って、前記刈刃６の回転軸とされる前記従動歯車３２は、前記歯車ケース７に片持ち支持されている。   The cutting blade 6 is sandwiched from above and below by an upper pressing member 36 and a lower pressing member 37 that are spline-fitted to the shaft portion 32A of the driven gear 32, from the lower end portion of the shaft portion 32A. A bolt 35 screwed into the formed female screw portion 32a is attached to the driven gear 32 so as to be integrally rotatable. Accordingly, the driven gear 32 that is the rotational axis of the cutting blade 6 is cantilevered by the gear case 7.

なお、前記ベアリング３４、３４間には、それぞれ前記ベアリング３４、３４のインナレース及びアウタレースに当接するように、インナカラー４１及びアウタカラー４２が介装されている。また、前記下側のベアリング３４（のインナレース）は前記上押さえ部材３６より係止され、前記アウタカラー４２は、止めねじ４４により前記下側筒状部７Ａに係止されている。前記インナカラー４１及び前記アウタカラー４２を介装しているのは、前記ベアリング３４、３４間の距離を適宜広げて、前記軸部３２Ａの支持をより確実なものとせしめるとともに、前記ボルト３５の螺合量を増やして前記従動歯車３７を抜け落ち難くするためである。   An inner collar 41 and an outer collar 42 are interposed between the bearings 34 and 34 so as to contact the inner race and the outer race of the bearings 34 and 34, respectively. The lower bearing 34 (the inner race thereof) is locked by the upper pressing member 36, and the outer collar 42 is locked to the lower cylindrical portion 7 </ b> A by a set screw 44. The inner collar 41 and the outer collar 42 are interposed so that the distance between the bearings 34 and 34 is appropriately increased to make the support of the shaft portion 32A more reliable, and the bolt 35 This is because the amount of screwing is increased to make it difficult for the driven gear 37 to fall off.

前記安全カバー８は、平面視扇形状で断面逆皿形とされ、前記刈刃６の一部（後側）の上面及び外周部を覆うように配在されて、前記歯車ケース７の前記上側筒状部７Ａの底面側に設けられた鍔状部７Ｃに、下面側から螺合せしめられる止めねじ４６により固定されている。   The safety cover 8 has a fan shape in plan view and has an inverted dish shape in cross section, and is disposed so as to cover the upper surface and outer periphery of a part (rear side) of the cutting blade 6, and the upper side of the gear case 7. It is fixed to a collar portion 7C provided on the bottom side of the cylindrical portion 7A by a set screw 46 screwed from the lower surface side.

前記した如くのＶ形ハンドル２０を備えた携帯型刈払機１では、前記把持部２２を右手で握って機体を吊持したとき、前記刈刃機構部５が下で前記エンジン１０が上の傾斜姿勢となるとともに、機体長さ方向の重心位置がちょうど前記把持部２２辺りとなり、さらに、前記把持部２２及び前記刈刃６が略水平となる（図１参照）ので、そのままの楽な姿勢で刈払作業を行うことができ、操作性、作業性に優れる。   In the portable brush cutter 1 having the V-shaped handle 20 as described above, when the gripping portion 22 is gripped with a right hand and the machine body is suspended, the cutting blade mechanism portion 5 is lowered and the engine 10 is inclined upward. In addition to the posture, the center of gravity in the machine body length direction is just around the gripping portion 22, and the gripping portion 22 and the cutting blade 6 are substantially horizontal (see FIG. 1). The mowing operation can be performed, and the operability and workability are excellent.

前記の如くの構成とされた本実施形態の携帯型刈払機１においては、操作桿３の後端部３ｂに外嵌される外嵌部２１及び把持部２２を有する側面視横倒しＶ字状ないしアイロン形のハンドル（Ｖ形ハンドル２０）に、前記エンジン１０の出力伝動連結部とされる出力軸１１、及び、前記防振部材１７を収納し得る収納部２５が設けられているので、Ｖ形ハンドル２０及び防振部材１７を、前記操作桿３に合理的に組み付けることができ、その結果、操作性、作業性が向上する。   In the portable brush cutter 1 according to the present embodiment configured as described above, the V-shaped sideways or side view is provided with the outer fitting portion 21 and the grip portion 22 that are fitted on the rear end portion 3b of the operation rod 3. Since the iron-shaped handle (V-shaped handle 20) is provided with the output shaft 11 serving as the output transmission connecting portion of the engine 10 and the storage portion 25 that can store the vibration isolating member 17, the V-shape handle is provided. The handle 20 and the vibration isolating member 17 can be reasonably assembled to the operation rod 3, and as a result, operability and workability are improved.

また、前記伝動軸４としてフレキシブルシャフトが用いられるとともに、前記操作桿３の前端側が湾曲せしめられて前記伝動軸４の前端部４ａの回転軸線Ｏａと前記刈刃６の回転軸線Ｏｂとが平行に配在されていることにより、歯車として高価な傘歯車に代えて安価な平歯車３１、３２を用いることができるとともに、直桿型用内燃エンジンの流用が可能となる。このため、前記刈刃６の回転軸が前記歯車ケース７に片持ち支持されていることと相まって、前記刈刃機構部５の重量軽減化、コンパクト化、低コスト化等を図ることができる。   In addition, a flexible shaft is used as the transmission shaft 4, and the front end side of the operating rod 3 is curved so that the rotation axis Oa of the front end 4 a of the transmission shaft 4 and the rotation axis Ob of the cutting blade 6 are parallel to each other. By being distributed, inexpensive spur gears 31 and 32 can be used as gears instead of expensive bevel gears, and a straight-line internal combustion engine can be used. For this reason, coupled with the fact that the rotary shaft of the cutting blade 6 is cantilevered by the gear case 7, it is possible to reduce the weight of the cutting blade mechanism section 5, make it compact, and reduce the cost.

さらに、前記安全カバー８が、前記歯車ケース７に下面側から螺合せしめられる止めねじ４６により固定されていることにより、前記止めねじ４６は、前記刈刃６を取り外さないと緩めることができなくなるので、前記安全カバー８を容易には取り外すことができない。このため、作業者は、常時安全カバー８を付けたまま刈払作業を行わざるを得ず、これによって作業の安全性を確保できる。   Further, since the safety cover 8 is fixed by a set screw 46 screwed to the gear case 7 from the lower surface side, the set screw 46 cannot be loosened unless the cutting blade 6 is removed. Therefore, the safety cover 8 cannot be easily removed. For this reason, the operator is forced to perform the mowing work with the safety cover 8 always attached, thereby ensuring the safety of the work.

図４は、本発明に係る携帯型刈払機の第二実施形態を示している。図４において、前述した図１〜図３に示される第一実施形態と同様構成の各部に対応する部分には同一の符号を付して重複説明を省略し、以下においては相違点を重点的に説明する。   FIG. 4 shows a second embodiment of the portable brush cutter according to the present invention. In FIG. 4, the same reference numerals are given to the portions corresponding to the same components as those in the first embodiment shown in FIGS. 1 to 3 described above, and a duplicate description will be omitted. Explained.

図４に示される携帯型刈払機１’も、第一実施形態のものと同様な、前端側が湾曲せしめられた操作桿３及び刈刃機構部５を有し、前記操作桿３の後端部３ｂに、前記刈刃６を前記操作桿３に内装されたフレキシブルシャフトからなる伝動軸４を介して駆動するための原動機としての小型空冷２サイクル内燃エンジン１０’が、Ｖ形ハンドル２０’を介して取り付けられている。   The portable brush cutter 1 ′ shown in FIG. 4 also has an operating rod 3 and a cutting blade mechanism portion 5 having a curved front end side, similar to the first embodiment, and a rear end portion of the operating rod 3 3b, a small air-cooled two-cycle internal combustion engine 10 ′ as a prime mover for driving the cutting blade 6 through a transmission shaft 4 comprising a flexible shaft built in the operation rod 3 is provided via a V-shaped handle 20 ′. Attached.

該エンジン１０’は、例えばＵ形ハンドルが用いられた直桿型刈払機に使用されているもので、その外装ケース１２’の前面側には円筒状連接部１３が前方に大きく突出して設けられるとともに、出力伝動連結部とされる出力軸１１’が遠心クラッチドラム１１ａ’から前方に突出せしめられており、該出力軸１１には前記伝動軸４が一体回動可能に駆動上連結され、また、前記円筒状連接部１３内には、短桿３ｃが挿入されて、円筒状防振部材５５を介して保持されている。   The engine 10 'is used in, for example, a straight type brush cutter using a U-shaped handle, and a cylindrical connecting portion 13 is provided on the front side of the outer case 12' so as to protrude greatly forward. At the same time, an output shaft 11 ′, which is an output transmission connecting portion, protrudes forward from the centrifugal clutch drum 11 a ′. The transmission shaft 4 is connected to the output shaft 11 so as to be integrally rotatable. In the cylindrical connecting portion 13, a short rod 3 c is inserted and held via a cylindrical vibration isolating member 55.

一方、前記Ｖ形ハンドル２０’の後端部２１ｂ’には、前記出力伝動連結部とされる出力軸１１’及び前記円筒状連接部１３、並びに、前記短桿３ｃに外嵌されたゴム等からなる円筒状の防振部材５１を収納し得る収納部２５’が設けられている。この収納部２５’は、例えば図５に示される如くに、下面が開口したすり割り構造とされており、ボルト５３・ナット５４で適宜に締め付けることにより、前記防振部材５１を介して前記短桿３ｃ部を保持することにより、前記エンジン１０’を連結するようになっている。また、前記外嵌部２１の前端部２１ａ’においても、円筒状の防振部材５２が前記操作桿３に外嵌されており、前記前端部２１ａ’も、ボルト２９、２９を締め付けることにより、前記操作桿３に前記防振部材５２を介して締め付け固定される。
このような構成とされた本実施形態の携帯型刈払機においても、第一実施形態と略同様な作用効果を得られることは勿論のこと、より良好な防振性能も得られる。 On the other hand, on the rear end portion 21b ′ of the V-shaped handle 20 ′, the output shaft 11 ′ serving as the output transmission connecting portion, the cylindrical connecting portion 13, the rubber fitted on the short rod 3c, etc. A storage portion 25 ′ capable of storing a cylindrical vibration-proof member 51 made of is provided. For example, as shown in FIG. 5, the storage portion 25 ′ has a slit structure with an open bottom surface, and is tightened appropriately with bolts 53 and nuts 54, so that the short part is interposed via the vibration isolation member 51. The engine 10 'is connected by holding the flange 3c. Further, also in the front end portion 21a ′ of the outer fitting portion 21, a cylindrical vibration-proof member 52 is fitted on the operation rod 3, and the front end portion 21a ′ is also tightened with bolts 29 and 29. The operation rod 3 is fastened and fixed via the vibration isolating member 52.
Even in the portable brush cutter according to the present embodiment configured as described above, it is possible to obtain substantially the same vibration-proof performance as well as to obtain substantially the same operational effects as the first embodiment.

以上、本発明の実施形態について詳述したが、本発明は、前記実施形態に限定されるものではなく、特許請求の範囲に記載された発明の精神を逸脱しない範囲で、設計において、種々の変更ができるものである。   Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be used without departing from the spirit of the invention described in the claims. It can be changed.

例えば、図示例では、平歯の駆動歯車３１及び従動歯車３２を示したが、適宜の曲がり歯のものを用いれば、歯車ケース７内の軸部３１Ａ、３２Ａを、より安定的に支持せしめることができる。   For example, in the illustrated example, the spur drive gear 31 and the driven gear 32 are shown, but the shaft portions 31A and 32A in the gear case 7 can be supported more stably if an appropriate bent gear is used. Can do.

以上の説明から理解されるように、本発明によれば、一般に用いられている刈払機用内燃エンジンを共用できるようにせしめるとともに、ハンドル及び防振部材を合理的に組み付けることができ、さらに、刈刃機構部の重量軽減化、コンパクト化、低コスト化等を図ることができる。   As can be understood from the above description, according to the present invention, it is possible to share a commonly used internal combustion engine for a brush cutter, and it is possible to rationally assemble a handle and a vibration isolating member, The cutting blade mechanism can be reduced in weight, reduced in size, reduced in cost, and the like.

本発明に係る携帯型刈払機の第一実施形態を示す全体概略側面図。The whole schematic side view which shows 1st embodiment of the portable brush cutter which concerns on this invention. 図１に示される携帯型刈払機のＶ形ハンドル周辺を示す部分切欠拡大側面図。The partial notch expansion side view which shows the V-shaped handle periphery of the portable brush cutter shown by FIG. 図１に示される携帯型刈払機の刈刃機構部を示す部分切欠拡大側面図。The partial notch enlarged side view which shows the cutting blade mechanism part of the portable brush cutter shown by FIG. 本発明に係る携帯型刈払機の第二実施形態のＶ形ハンドル周辺を示す部分切欠拡大断面図。The partial notch enlarged sectional view which shows the V-shaped handle periphery of 2nd embodiment of the portable brush cutter which concerns on this invention. 図４のＶ−Ｖ矢視断面図。FIG. 5 is a cross-sectional view taken along line VV in FIG. 4.

符号の説明Explanation of symbols

１ 携帯型刈払機
３ 操作桿
３ａ 前端部
３ｂ 後端部
４ 伝動軸
４ａ 前端軸
５ 刈刃機構部
６ 刈刃
７ 歯車ケース
８ 安全カバー
１０ 内燃エンジン（原動機）
１１、１３ 出力伝動連結部
２０ Ｖ形ハンドル
１７、５１、５２、５５ 防振部材
２１ 外嵌部
２２ 把持部
２５ 収納部
３１ 駆動歯車
３２ 従動歯車
４６ 止めねじ DESCRIPTION OF SYMBOLS 1 Portable brush cutter 3 Operation rod 3a Front end 3b Rear end 4 Transmission shaft 4a Front end shaft 5 Cutting blade mechanism 6 Cutting blade 7 Gear case 8 Safety cover 10 Internal combustion engine (prime mover)
11, 13 Output transmission connecting part 20 V-shaped handle 17, 51, 52, 55 Anti-vibration member 21 External fitting part 22 Grasping part 25 Storage part 31 Drive gear 32 Driven gear 46 Set screw

Claims (4)

操作桿（３）の前端部（３ａ）に刈刃（６）、歯車ケース（７）、安全カバー（８）等からなる刈刃機構部（５）が設けられ、前記操作桿（３）の後端部（３ｂ）に、前記刈刃（６）を前記操作桿（３）に内装された伝動軸（４）を介して駆動するための原動機（１０）が取り付けられてなる携帯型刈払機（１）であって、
前記操作桿（３）の後端部（３ｂ）に、前記原動機（１０）に隣接して、前記後端部（３ｂ）に外嵌される外嵌部（２１）及び把持部（２２）を有するハンドル（２０）が取り付けられ、該ハンドル（２０）に、前記原動機（１０）の出力伝動連結部（１１、１３）、及び、前記原動機（１０）と前記ハンドル（２０）との間に配在される防振部材（１７、５１、５２）を収納し得る収納部（２５、２５’）が設けられており、
前記伝動軸（４）としてフレキシブルシャフトが用いられるとともに、前記操作桿（３）の前端側が湾曲せしめられて前記伝動軸（４）の前端部（４ａ）と前記刈刃（６）の回転軸（３２）とが平行に配在されていることを特徴とする携帯型刈払機。 A cutting blade mechanism (5) including a cutting blade (6) , a gear case (7), a safety cover (8), and the like is provided at the front end (3a) of the operating rod (3). A portable brush cutter in which a prime mover (10) for driving the cutting blade (6) via a transmission shaft (4) housed in the operating rod (3) is attached to the rear end (3b). a (1),
An outer fitting part (21) and a gripping part (22) fitted to the rear end part (3b) are adjacent to the prime mover (10) at the rear end part (3b) of the operating rod (3). The handle (20) is attached, and the handle (20) is connected to the output transmission connecting portion (11, 13) of the prime mover (10) and between the prime mover (10) and the handle (20). Storage portions (25, 25 ′) that can store the existing vibration isolation members (17, 51, 52) are provided ,
A flexible shaft is used as the transmission shaft (4), and the front end side of the operation shaft (3) is bent so that the front end portion (4a) of the transmission shaft (4) and the rotary shaft of the cutting blade (6) ( 32) and a portable brush cutter characterized by being arranged in parallel . 前記操作桿（３）の前端部（３ａ）に前記歯車ケース（７）が取り付けられ、該歯車ケース（７）内に、前記伝動軸（４）の前端部（４ａ）が駆動上連結される駆動歯車（３１）と、該駆動歯車（３１）に噛合する前記刈刃（６）の回転軸となる従動歯車（３２）と、が配在されていることを特徴とする請求項１に記載の携帯型刈払機。 The gear case (7) is attached to the front end (3a) of the operating rod (3), and the front end (4a) of the transmission shaft (4) is connected to the gear case (7) for driving. a drive gear (31), according to claim 1 in which the driven gear (32) serving as the rotary shaft of the cutting blade (6) meshing with said drive gear (31), characterized in that is Zaisa distribution Portable brush cutter. 前記刈刃（６）の回転軸（３２）は、前記歯車ケース（７）に片持ち支持されていることを特徴とする請求項１又は２に記載の携帯型刈払機。 The portable brush cutter according to claim 1 or 2 , wherein the rotary shaft (32) of the cutting blade (6) is cantilevered by the gear case (7). 前記安全カバー（８）は、前記刈刃（６）の上面及び外周部を覆うように配在されて、前記歯車ケース（７）に下面側から螺合せしめられるねじ類（４６）により固定されていることを特徴とする請求項１から３のいずれか一項に記載の携帯型刈払機。 The safety cover (8) is arranged so as to cover the upper surface and the outer periphery of the cutting blade (6), and is fixed by screws (46) screwed into the gear case (7) from the lower surface side. The portable brush cutter according to any one of claims 1 to 3 , wherein the portable brush cutter is provided.
JP2003292017A 2003-08-12 2003-08-12 Portable brush cutter Expired - Fee Related JP4153382B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010022235A (en) * 2008-07-16 2010-02-04 Starting Ind Co Ltd Bush cutter
JP5695201B2 (en) * 2010-09-13 2015-04-01 フスクバルナ アクティエボラーグ Handle device for power tools
US20160340849A1 (en) 2015-05-18 2016-11-24 M-B-W, Inc. Vibration isolator for a pneumatic pole or backfill tamper
US10053873B2 (en) 2016-08-17 2018-08-21 M-B-W, Inc. Handle assemblies with vibration dampening assemblies for concrete finishing machines
GB2553180B (en) * 2016-08-17 2021-08-11 Mbw Inc Power tool handle assemblies with vibration dampening assemblies

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