JP5297646B2 - Transmission shaft support structure for portable work machines - Google Patents

Transmission shaft support structure for portable work machines Download PDF

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JP5297646B2
JP5297646B2 JP2007321200A JP2007321200A JP5297646B2 JP 5297646 B2 JP5297646 B2 JP 5297646B2 JP 2007321200 A JP2007321200 A JP 2007321200A JP 2007321200 A JP2007321200 A JP 2007321200A JP 5297646 B2 JP5297646 B2 JP 5297646B2
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transmission shaft
shape
movement
support structure
bearing member
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JP2009142178A (en
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俊介 中舘
智樹 伊藤
雅 千葉
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Yamabiko Corp
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Description

本発明は、内燃エンジン等の駆動源の動力を、操作桿内に内挿されて複数の軸受部材により支持された伝動軸を介して刈刃等からなる作業部に伝達するようにされた携帯型作業機の伝動軸支持構造に関する。   The present invention relates to a portable device configured to transmit the power of a drive source such as an internal combustion engine to a working unit composed of a cutting blade or the like via a transmission shaft that is inserted into an operating rod and supported by a plurality of bearing members. The present invention relates to a transmission shaft support structure for a type work machine.

この種の携帯型作業機の一つである携帯型刈払機の一例を、図６を参照しながら簡単に説明する。   An example of a portable brush cutter which is one of this type of portable work machine will be briefly described with reference to FIG.

図示例の携帯型刈払機１は、操作桿２の前端に、丸鋸刃状の刈刃４、ギアボックス１９、安全カバー５等からなる作業部としての刈刃機構部３が設けられ、その後端に、駆動源としての、リコイルスタータ８や燃料タンク９が付設された内燃エンジン（小型空冷２サイクルガソリンエンジン）６が取り付けられている。この内燃エンジンの動力は、遠心クラッチ１８や前記操作桿２に内装された伝動軸７を介して前記作業部としての刈刃機構部３に伝達される。   In the illustrated example, the portable brush cutter 1 is provided with a cutting blade mechanism unit 3 as a working unit including a circular saw blade-shaped cutting blade 4, a gear box 19, a safety cover 5 and the like at the front end of the operation rod 2. An internal combustion engine (small air-cooled two-cycle gasoline engine) 6 provided with a recoil starter 8 and a fuel tank 9 as a drive source is attached to the end. The power of the internal combustion engine is transmitted to the cutting blade mechanism unit 3 as the working unit via the centrifugal clutch 18 and the transmission shaft 7 built in the operation rod 2.

また、前記操作桿２おける中央部付近には、刈払作業を行うべく前記刈刃機構部３を左右に振ったり上下動させるためのＵ形ハンドル１０が取り付けられ、このＵ形ハンドル１０の左右両端部にそれぞれ左グリップ１１、右グリップ１２が装着されている。   Further, a U-shaped handle 10 is attached near the central portion of the operation rod 2 for swinging the cutting blade mechanism unit 3 to the left and right and moving it up and down to perform the brushing operation. A left grip 11 and a right grip 12 are attached to both ends.

このような構成を有する携帯型刈払機１においては、前記内燃エンジン６の加減速時等におけるトルク変動、回転数変動や前記刈刃４に加えられる負荷の変動により、前記伝動軸７にねじり振動が生じる。また、急に負荷低減状態になると、前記伝動軸７がスプリングバック現象を起こし、回転方向にオーバーランしてねじれる。このようにエンジンの加減速時等におけるトルク変動、回転数変動や負荷変動、スプリングバック現象等により、前記伝動軸７が回転方向及びその逆方向にねじれたり戻ったりしてねじり振動が生じる。   In the portable brush cutter 1 having such a configuration, the transmission shaft 7 is subjected to torsional vibration due to torque fluctuation, rotation speed fluctuation or load fluctuation applied to the cutting blade 4 during acceleration / deceleration of the internal combustion engine 6. Occurs. Further, when the load is suddenly reduced, the transmission shaft 7 causes a springback phenomenon, overruns in the rotational direction and twists. In this way, torque transmission, rotational speed fluctuation, load fluctuation, springback phenomenon, etc. during acceleration / deceleration of the engine cause the transmission shaft 7 to twist or return in the rotational direction and the opposite direction, resulting in torsional vibration.

かかるねじり振動が、操作桿２や前記ハンドル１０を介して作業者の手に伝播し、操作性の低下や疲労の増大を招く。   Such torsional vibration propagates to the operator's hand through the operating rod 2 and the handle 10, thereby causing a decrease in operability and an increase in fatigue.

そこで、このようなねじり振動を抑制すべく、下記特許文献１等にも見られるように、エンジン６と伝動軸７との間に、伝動軸７のねじり振動を圧縮コイルばねの伸縮運動に変換して吸収する振動吸収継手等のねじり緩衝手段を設けることが提案されている。   Therefore, in order to suppress such torsional vibration, the torsional vibration of the transmission shaft 7 is converted into the expansion and contraction motion of the compression coil spring between the engine 6 and the transmission shaft 7 as seen in Patent Document 1 below. It has been proposed to provide a torsional buffer means such as a vibration absorbing joint that absorbs.

特開2007-61031号公報JP 2007-61031 A

ところで、前記した如くの刈払機１においては、前記操作桿２内には、伝動軸７を支持するため、所要数の軸受部材２０が所定の間隔をあけて配置されている。この軸受部材２０は、通常、メタルブッシュとゴム等の弾性材料で作製されたホルダとからなっていて、操作桿２内に圧入されるとともに、その際の操作桿２に対する圧入緊度のみで保持されている。   By the way, in the brush cutter 1 as described above, a required number of bearing members 20 are arranged in the operating rod 2 with a predetermined interval in order to support the transmission shaft 7. The bearing member 20 is usually composed of a metal bush and a holder made of an elastic material such as rubber. The bearing member 20 is press-fitted into the operation rod 2 and is held only by the press-fitting tension with respect to the operation rod 2 at that time. Has been.

そのため、伝動軸７の曲がりや摩耗等により伝動軸７の振れが大きくなってくると、軸受部材部材２０が駆動源であるエンジン６から遠ざかる方向（反駆動源側）に移動してしまうという問題があった。この場合、移動することで伝動軸７の振れがさらに増幅されるため、伝動軸７ひいては操作桿２の振動が大きくなり、甚だしくは、伝動軸７が操作桿２に接触する等して損傷してしまうおそれがあった。   Therefore, when the deflection of the transmission shaft 7 increases due to bending or wear of the transmission shaft 7, the bearing member member 20 moves in the direction away from the engine 6 that is the drive source (on the non-drive source side). was there. In this case, since the movement of the transmission shaft 7 is further amplified by the movement, the transmission shaft 7 and thus the vibration of the operation rod 2 are increased, and the transmission shaft 7 is damaged due to contact with the operation rod 2 or the like. There was a risk of it.

このような、軸受部材が反駆動源側に移動してしまうという問題は、特に、前記ねじり緩衝手段等を設けた場合に発生しやすくなる。また、操作桿内に配置された所要数の軸受部材のうち、最も駆動源側に配置されたものが最も移動しやすい。これは、前記ねじり緩衝手段等は、回転振動要因ともなり、その振れは振動源に近いほど大きくなるので、近傍の軸受部材は振動源から遠ざかる方向の力を受けるからであると考えられる。   Such a problem that the bearing member moves to the counter drive source side is likely to occur particularly when the torsional buffering means is provided. Of the required number of bearing members arranged in the operating rod, the one arranged closest to the drive source is most easily moved. This is presumably because the torsional buffer means or the like also becomes a cause of rotational vibration, and the vibration becomes larger as it is closer to the vibration source, so that the nearby bearing member receives a force in a direction away from the vibration source.

本発明は、上述した如くの従来の問題を解消すべくなされたもので、その目的とするところは、操作桿内で保持された軸受部材の反駆動源側への移動を確実に阻止でき、伝動軸や操作桿の振動や損傷を効果的に抑えることのできる携帯型作業機の伝動軸支持構造を提供することにある。   The present invention was made to solve the conventional problems as described above, and the object of the present invention is to reliably prevent the movement of the bearing member held in the operating rod to the side opposite to the driving source, An object of the present invention is to provide a transmission shaft support structure for a portable work machine that can effectively suppress vibration and damage to the transmission shaft and operation rod.

前記の目的を達成すべく、本発明に係る伝動軸支持構造は、内燃エンジン等の駆動源の動力を、操作桿に内挿されて複数の軸受部材により支持された伝動軸を介して刈刃等からなる作業部に伝達するようにされた携帯型作業機に適用されるもので、前記軸受部材は、前記操作桿に対する圧入緊度のみで保持されており、該操作桿内で保持された軸受部材の反駆動源側への移動を阻止すべく、前記操作桿内又はその外周側に移動阻止手段が設けられ、前記移動阻止手段は、前記操作桿内において前記駆動源に最も近い位置に配置されている前記軸受部材の反駆動源側への移動を阻止するようにされていることを特徴としている。 In order to achieve the above-described object, the transmission shaft support structure according to the present invention includes a cutting blade that is inserted into an operating rod and supported by a plurality of bearing members with power from a drive source such as an internal combustion engine. The bearing member is held only by the press-fitting tightness with respect to the operating rod, and is held in the operating rod. In order to prevent the bearing member from moving to the side opposite to the driving source, movement blocking means is provided in the operating rod or on the outer peripheral side thereof, and the movement blocking means is located at a position closest to the driving source in the operating rod. The bearing member is arranged to be prevented from moving toward the counter drive source side .

前記移動阻止手段は、好ましくは、前記操作桿内において前記駆動源に最も近い位置に配置されている軸受部材より反駆動源側に圧入されてその内周面に弾発的に圧接する形状復元力を持つライナーで構成される。 It said movement preventing means preferably resiliently pressed against the inner peripheral surface thereof is pressed from the bearing member disposed closest to the driving source have you on the operation桿内the non-drive-source side Consists of a liner with shape restoring force.

前記移動阻止手段を構成するライナーは、好ましくは、自然状態ではその断面外形が、楕円、Ｄ形、Ｃ形、花丸形、歯車形等の非円形とされる。   The cross section of the liner constituting the movement preventing means is preferably non-circular such as an ellipse, a D shape, a C shape, a flower round shape, and a gear shape in a natural state.

前記移動阻止手段を構成するライナーは、好ましくは、自然状態ではその断面外形が、複数の突条を有する星形、スクリュー形、プロペラ形等とされる。   Preferably, the liner constituting the movement preventing means has a star shape, a screw shape, a propeller shape or the like having a plurality of protrusions in a cross-sectional outer shape in a natural state.

この場合、前記非円形ライナー又は前記突条は、好ましくは、前記伝動軸の回転方向には回り難くなるように、前記回転方向とは逆向きに撚られるか、あるいは、渦流状に形成される。
他の好ましい態様では、前記移動阻止手段の長さは、隣り合う軸受部材の離隔距離に設定される。 In this case, the non-circular liner or the protrusion is preferably twisted in a direction opposite to the rotation direction or formed in a vortex shape so as to be difficult to rotate in the rotation direction of the transmission shaft. .
In another preferred embodiment, the length of the movement preventing means is set to a separation distance between adjacent bearing members.

前記移動阻止手段は、好ましくは、前記操作桿内における軸受部材より反駆動源側に挿
入される外形縮小可能でかつ形状復元力を持つ、断面外形がハット形の操作桿内周面形
状と相似しない形状で所定の長さを持つ板ばね状部材で構成される。 The movement preventing means is preferably similar to the shape of the inner peripheral surface of the operating rod with a hat-shaped cross-sectional outer shape that can be reduced in outer shape and has a shape restoring force that is inserted on the side opposite to the driving source from the bearing member in the operating rod. It is constituted by a leaf spring-like member having a predetermined length and a shape that does not.

他の好ましい態様では、前記移動阻止手段の反駆動源側への移動を阻止する係止手段が設けられる。   In another preferred aspect, a locking means for preventing the movement blocking means from moving toward the counter drive source is provided.

前記移動阻止手段は、好ましくは、前記操作桿の外側から内方に向けて形成されたカシメ突起、前記操作桿の外側からねじ込まれるねじ部材、前記操作桿の一部を外側から縮径してなる縮径部等で構成される。   Preferably, the movement preventing means preferably has a caulking projection formed from the outside to the inside of the operating rod, a screw member screwed from the outside of the operating rod, and a diameter of a part of the operating rod reduced from the outside. It consists of a reduced diameter part.

上記の如くの構成とされた本発明に係る携帯型作業機の伝動軸支持構造では、例えば、操作桿内における軸受部材より反駆動源側に圧入されてその内周面に弾発的に圧接する形状復元力を持つライナー等で構成される移動阻止手段が設けられるので、操作桿内で保持された軸受部材の反駆動源側への移動を確実に阻止でき、伝動軸や操作桿等の振動や損傷を効果的に抑えることができる。   In the transmission shaft support structure of the portable work machine according to the present invention configured as described above, for example, the bearing member in the operating rod is press-fitted to the counter drive source side and is elastically pressed to the inner peripheral surface thereof. Movement prevention means composed of a liner or the like having a shape restoring force to prevent the movement of the bearing member held in the operation rod to the non-drive source side can be reliably prevented, such as the transmission shaft and the operation rod. Vibration and damage can be effectively suppressed.

以下、本発明の携帯型作業機の伝動軸支持構造の実施の形態を図面を参照しながら説明する。   Embodiments of a transmission shaft support structure for a portable work machine according to the present invention will be described below with reference to the drawings.

図１〜図５は、本発明に係る携帯型作業機の伝動軸支持構造の実施の形態の具体的な実施例１〜５を示している。以下、各実施例について、前述した図６に示される如くの、内燃エンジン６等の駆動源の動力を、操作桿２に内挿されて複数の軸受部材２０（２１、２２、２３、…）により支持された伝動軸７を介して刈刃４等からなる作業部に伝達するようにされた携帯型刈払機１に適用した場合を説明する。   1 to 5 show specific examples 1 to 5 of the embodiment of the transmission shaft support structure of the portable work machine according to the present invention. Hereinafter, for each of the embodiments, as shown in FIG. 6 described above, the power of the driving source such as the internal combustion engine 6 is inserted into the operating rod 2 to be a plurality of bearing members 20 (21, 22, 23,...). A case will be described in which the present invention is applied to a portable brush cutter 1 that is configured to transmit to a working unit composed of a cutting blade 4 or the like via a transmission shaft 7 supported by the above.

各実施例で共通しているのは、操作桿２内に、駆動源側から順次、第１軸受部材２１、第２軸受部材２２、第３軸受部材２３、…が配置されている。各軸受部材２１、２２、２３、…は、メタルブッシュ２１ａ、２２ａ、２３ａ、…とゴム等の弾性材料で作製されたホルダ２１ｂ、２２ｂ、２３ｂとからなっていて、操作桿２に対する圧入緊度のみで保持されており、操作桿２内において内燃エンジン６等の駆動源に最も近い位置に配置されて保持された軸受部材２１の反駆動源側への移動を阻止すべく、前記操作桿２内又はその外周側に移動阻止手段が設けられていることである。   In each of the embodiments, the first bearing member 21, the second bearing member 22, the third bearing member 23,... Are arranged in the operation rod 2 sequentially from the drive source side. Each bearing member 21, 22, 23,... Is composed of metal bushes 21 a, 22 a, 23 a,... And holders 21 b, 22 b, 23 b made of an elastic material such as rubber. In order to prevent the movement of the bearing member 21 disposed and held at the position closest to the driving source of the internal combustion engine 6 or the like in the operating rod 2 to the counter driving source side, the operating rod 2 The movement preventing means is provided on the inner side or on the outer peripheral side thereof.

［実施例１］
図１に示される伝動軸支持構造の実施例１では、軸受部材２１の移動阻止手段として、操作桿２内における第１軸受部材２１と第２軸受部材２２との間（第１軸受部材２１の反駆動源側）に圧入されてその内周面に弾発的に圧接する形状復元力を持つライナー３１が使用されている。 [Example 1]
In the first embodiment of the transmission shaft support structure shown in FIG. 1, the movement preventing means for the bearing member 21 is provided between the first bearing member 21 and the second bearing member 22 in the operating rod 2 (of the first bearing member 21). A liner 31 having a shape restoring force that is press-fitted into the counter-drive source side and elastically presses against the inner peripheral surface thereof is used.

詳細には、このライナー３１は、合成樹脂を素材として作製され、断面外形が自然状態では楕円の管状材とされ、その長径Ｄｂが操作桿２の内径Ｄａより大きくされており、その長さは、第１軸受部材２１と第２軸受部材２２との離隔距離に設定されていて、その両端面がそれぞれ第１軸受部材２１の反駆動源側の端面と第２軸受部材２２の駆動源側の端面に当接せしめられている。   Specifically, the liner 31 is made of synthetic resin, and the cross-sectional outer shape is an oval tubular material in a natural state. The major axis Db is larger than the inner diameter Da of the operation rod 2, and the length is The first bearing member 21 and the second bearing member 22 are set to be separated from each other, and both end surfaces of the first bearing member 21 and the second bearing member 22 are on the side opposite to the driving source side and the driving source side of the second bearing member 22, respectively. It is brought into contact with the end face.

かかる構成の楕円ライナー３１は、操作桿２内に圧入する際、その断面外形が円形となるように弾性変形せしめられ、圧入後はその形状復元力により操作桿２の内周面に圧接する。そのため、操作桿２の内周面との間に強い摩擦抵抗が生じ、ライナー３１は操作桿２にしっかりと保持されるので、第１軸受部材２１の反駆動源側への移動を確実に阻止できる。   When the elliptical liner 31 having such a configuration is press-fitted into the operation rod 2, the elliptical liner 31 is elastically deformed so as to have a circular cross-sectional outer shape, and after the press-fitting, is pressed against the inner peripheral surface of the operation rod 2 by its shape restoring force. Therefore, a strong frictional resistance is generated between the inner surface of the operating rod 2 and the liner 31 is firmly held by the operating rod 2, so that the movement of the first bearing member 21 to the counter drive source side is surely prevented. it can.

なお、ライナーの断面外形としては、本実施例のように楕円のものの他、Ｄ形、Ｃ形、花丸形、歯車形等のものも使用することができ、また、前記伝動軸７の回転方向Ｐには回り難くなるように、ライナー自体を前記回転方向Ｐとは逆向きに撚りを加えて形成することもできる。   In addition, as the cross-sectional outline of the liner, in addition to an elliptical one as in the present embodiment, a D-shaped, C-shaped, flower-round, gear-shaped or the like can be used, and the rotation of the transmission shaft 7 can be used. The liner itself can be formed by twisting in the direction opposite to the rotation direction P so that it is difficult to rotate in the direction P.

［実施例２］
図２に示される伝動軸支持構造の実施例２では、軸受部材２１の移動阻止手段として、
実施例１の楕円ライナー３１が用いられ、さらに、このライナー３１の反駆動源側への移動を阻止すべく、係止手段として、操作桿２の外側からライナー３１にねじ込まれるねじ部材３２が付設されている。 [Example 2]
In the second embodiment of the transmission shaft support structure shown in FIG.
The oval liner 31 of the first embodiment is used, and a screw member 32 that is screwed into the liner 31 from the outside of the operation rod 2 is provided as a locking means in order to prevent the liner 31 from moving to the counter drive source side. Has been.

このように、移動阻止手段としてのライナー３１の移動を阻止する係止手段としてのねじ部材３２を付設することにより、第１軸受部材２１の反駆動源側への移動を一層確実に阻止できる。   In this way, by attaching the screw member 32 as the locking means for blocking the movement of the liner 31 as the movement blocking means, the movement of the first bearing member 21 toward the counter drive source can be more reliably blocked.

［実施例３］
図３に示される伝動軸支持構造の実施例３では、軸受部材２１の移動阻止手段として、
その断面外形が、複数（ここでは４つ）の突条３３ａを有する星形とされたライナー３３が用いられている。 [Example 3]
In Example 3 of the transmission shaft support structure shown in FIG.
A liner 33 whose cross-sectional outer shape is a star shape having a plurality (four in this case) of protrusions 33a is used.

前記突条３３ａは、前記伝動軸７の回転方向Ｐには回り難くなるように、前記回転方向Ｐとは逆向きに撚られた渦流状とされている。   The protrusion 33a has a vortex shape twisted in the opposite direction to the rotation direction P so that it is difficult to rotate in the rotation direction P of the transmission shaft 7.

この星形ライナー３３も、実施例１と同様に、操作桿２内における第１軸受部材２１と第２軸受部材２２との間に圧入（嵌挿）されてその内周面に突条３３ａ部分が弾発的に圧接する形状復元力を持つようになっている。そのため、操作桿２の内周面との間に生じる強い摩擦抵抗により操作桿２にしっかりと保持されるので、実施例１と同様に、第１軸受部材２１の反駆動源側への移動を確実に阻止できる。   Similarly to the first embodiment, the star liner 33 is also press-fitted (inserted) between the first bearing member 21 and the second bearing member 22 in the operating rod 2 and the protrusion 33a portion is formed on the inner peripheral surface thereof. Has a shape restoring force that presses elastically. For this reason, the strong frictional resistance generated between the inner surface of the operating rod 2 is firmly held by the operating rod 2, so that the first bearing member 21 is moved to the counter driving source side in the same manner as in the first embodiment. Can be surely stopped.

また、４つの突条３３ａは、前記回転方向Ｐとは逆向きに撚られた渦流状とされているので、伝動軸７の回転方向Ｐに対しては反駆動源側への移動抵抗が大きくなるばかりではなく、反回転方向への移動抵抗が小さくなって、嵌挿組み付けが容易となるという利点も得られる。   Further, since the four protrusions 33a are formed in a vortex shape twisted in the direction opposite to the rotation direction P, the movement resistance toward the counter drive source side is large with respect to the rotation direction P of the transmission shaft 7. In addition, the movement resistance in the counter-rotating direction is reduced, and the advantage that the fitting and insertion is facilitated is also obtained.

なお、ライナーの断面外形としては、本実施例のように星形のものの他、スクリュー形、プロペラ形等のものも使用することができる。   As the cross-sectional outer shape of the liner, a screw shape, a propeller shape, etc. can be used in addition to a star shape as in this embodiment.

［実施例４］
図４に示される伝動軸支持構造の実施例４では、軸受部材２１の移動阻止手段として、外形縮小可能でかつ形状復元力を持つ、断面外形がハット形で所定の長さを持つ板ばね状部材３４が用いられている。 [Example 4]
In the fourth embodiment of the transmission shaft support structure shown in FIG. 4, as a means for preventing movement of the bearing member 21, a leaf spring shape having a hat-shaped cross-sectional outer shape having a shape restoring force capable of reducing the outer shape and having a shape restoring force is provided. A member 34 is used.

この板ばね状部材３４も、操作桿２内における第１軸受部材２１と第２軸受部材２２との間に圧入（嵌挿）されてその内周面に、３点３４ａ、３４ｂ、３４ｃが弾発的に強く圧接する。そのため、操作桿２の内周面との間に生じる強い摩擦抵抗により操作桿２にしっかりと保持されるので、実施例１、２と同様に、第１軸受部材２１の反駆動源側への移動を確実に阻止できる。   This leaf spring-shaped member 34 is also press-fitted (inserted) between the first bearing member 21 and the second bearing member 22 in the operating rod 2 and three points 34a, 34b, 34c are elastically formed on the inner peripheral surface thereof. It is strongly pressed. Therefore, since it is firmly held by the operating rod 2 by the strong frictional resistance generated between the inner peripheral surface of the operating rod 2, as in the first and second embodiments, the first bearing member 21 is moved toward the counter drive source side. The movement can be surely prevented.

［実施例５］
図５に示される伝動軸支持構造の実施例５では、軸受部材２１の移動阻止手段として、
操作桿の外側から第１軸受部材２１及び第２軸受部材２２にねじ込まれるねじ部材３５、３５が用いられている。 [Example 5]
In Example 5 of the transmission shaft support structure shown in FIG.
Screw members 35 and 35 screwed into the first bearing member 21 and the second bearing member 22 from the outside of the operating rod are used.

このように、軸受部材２１、２２をねじ部材３５、３５で直接係止するようにしても、軸受部材２１、２２の反駆動源側への移動を確実に阻止できる。   As described above, even when the bearing members 21 and 22 are directly locked by the screw members 35 and 35, the movement of the bearing members 21 and 22 to the counter drive source side can be reliably prevented.

なお、上記のようにねじ部材３５を用いる他、操作桿２の外側から内方に向けてカシメ突起を形成する、操作桿２の一部を外側から縮径する等の手法を採用することもできる。   In addition to using the screw member 35 as described above, a method of forming a caulking projection from the outside of the operation rod 2 to the inside or reducing a diameter of a part of the operation rod 2 from the outside may be employed. it can.

以上のように、本実施形態の携帯型作業機の伝動軸支持構造では、軸受部材２１の移動阻止手段３１、３２、３３、３４、３５が設けられるので、操作桿２内で保持された軸受部材２１の反駆動源側への移動を確実に阻止でき、伝動軸７や操作桿２等の振動や損傷を効果的に抑えることができる。   As described above, in the transmission shaft support structure of the portable work machine according to the present embodiment, since the movement preventing means 31, 32, 33, 34, 35 of the bearing member 21 are provided, the bearing held in the operation rod 2 is provided. The movement of the member 21 to the side opposite to the driving source can be reliably prevented, and vibration and damage of the transmission shaft 7 and the operating rod 2 can be effectively suppressed.

なお、以上の説明とは逆に、軸受部材が駆動源側に移動するケースとして、ねじり緩衝手段を刈刃側に配設する場合や、操作桿を分割式にして伝動軸の連結部が一定以上の重量となった場合等は想定し得る。前記背景技術で説明したように、軸受部材は回転振動要因から遠ざかる方向に力を受けるからであるが、ねじり緩衝手段を刈刃側に配設することは、操作桿先端の重量増加により作業性を悪化させることになって現実的ではなく、また、伝動軸中間部に連結部が形成される場合には、大きな回転振動要因となることは希なので通常は軸受部材を移動させるには至らず、仮に一定以上の回転振動要因になったとしても移動阻止手段は連結部の何れか一方側の軸受部材に対して設けるだけでよい。   Contrary to the above description, as a case where the bearing member moves to the drive source side, the torsional buffer means is arranged on the cutting blade side, or the operating rod is divided so that the transmission shaft coupling portion is constant. The case where it becomes the above weight etc. can be assumed. As described in the background art, the bearing member receives a force in a direction away from the rotational vibration factor. However, the arrangement of the torsional buffer means on the cutting blade side increases the workability due to an increase in the weight of the operating rod tip. It is not realistic to deteriorate, and when the connecting part is formed in the middle part of the transmission shaft, it is rare that it becomes a big rotational vibration factor, so it usually does not lead to moving the bearing member Even if the rotational vibration factor exceeds a certain level, the movement preventing means need only be provided for the bearing member on either side of the connecting portion.

本発明に係る伝動軸支持構造の実施例１を示す断面図。Sectional drawing which shows Example 1 of the transmission shaft support structure which concerns on this invention. 本発明に係る伝動軸支持構造の実施例２を示す断面図。Sectional drawing which shows Example 2 of the transmission shaft support structure which concerns on this invention. 本発明に係る伝動軸支持構造の実施例３を示す断面図。Sectional drawing which shows Example 3 of the transmission shaft support structure which concerns on this invention. 本発明に係る伝動軸支持構造の実施例４を示す断面図。Sectional drawing which shows Example 4 of the transmission shaft support structure which concerns on this invention. 本発明に係る伝動軸支持構造の実施例５を示す断面図。Sectional drawing which shows Example 5 of the transmission shaft support structure which concerns on this invention. 携帯型刈払機の一例を示す斜視図。The perspective view which shows an example of a portable brush cutter.

符号の説明Explanation of symbols

１ 携帯型刈払機
２ 操作桿
３ 刈刃機構部
４ 刈刃
６ 内燃エンジン（駆動源）
７ 伝動軸
２１〜２３ 軸受部材
３１ 楕円ライナー（移動阻止手段）
３２ ねじ部材（係止手段）
３３ 星形ライナー（移動阻止手段）
３３ａ 突条
３４ 板ばね状部材（移動阻止手段）
３５ ねじ部材（移動阻止手段）
Ｐ 伝動軸の回転方向 DESCRIPTION OF SYMBOLS 1 Portable brush cutter 2 Operating rod 3 Cutting blade mechanism 4 Cutting blade 6 Internal combustion engine (drive source)
7 Transmission shaft 21-23 Bearing member 31 Elliptical liner (movement prevention means)
32 Screw member (locking means)
33 Star Liner (Movement prevention means)
33a ridge 34 leaf spring-like member (movement blocking means)
35 Screw member (movement blocking means)
P Direction of rotation of transmission shaft

Claims (6)

内燃エンジン（６）等の駆動源の動力を、操作桿（２）に内挿されて複数の軸受部材（２１、２２、２３）により支持された伝動軸（７）を介して刈刃（４）等からなる作業部（３）に伝達するようにされた携帯型作業機の伝動軸支持構造であって、
前記軸受部材（２１、２２、２３）は、前記操作桿（２）に対する圧入緊度のみで保持されており、該操作桿（２）内で保持された軸受部材（２１、２２、２３）の反駆動源側への移動を阻止すべく、前記操作桿（２）内又はその外周側に移動阻止手段（３１〜３５）が設けられ、
前記移動阻止手段（３１〜３５）は、前記操作桿（２）内において前記駆動源（６）に最も近い位置に配置されている前記軸受部材（２１）の反駆動源側への移動を阻止するようにされていることを特徴とする携帯型作業機の伝動軸支持構造。 The power of a drive source such as an internal combustion engine (6) is inserted into the operating rod (2) and is then inserted into the cutting blade (4) via a transmission shaft (7) supported by a plurality of bearing members (21 , 22, 23 ). A transmission shaft support structure for a portable work machine that is adapted to transmit to a working part (3) comprising,
Said bearing member (21, 22, 23), said operating rod (2) is held only by the press-fitting bulk density for, the manipulation rod (2) in the bearing member (21, 22, 23) which is held in the In order to prevent movement toward the counter-drive source side, movement preventing means (31 to 35) are provided in the operation rod (2) or on the outer peripheral side thereof,
The movement blocking means (31-35) blocks the movement of the bearing member (21) disposed at the position closest to the drive source (6) in the operation rod (2) to the counter drive source side. A structure for supporting a transmission shaft of a portable work machine, characterized in that: 前記移動阻止手段は、前記操作桿（２）内において前記駆動源（６）に最も近い位置に配置されている軸受部材（２１）より反駆動源側に圧入されてその内周面に弾発的に圧接する形状復元力を持つライナー（３１）で構成され、
前記移動阻止手段を構成するライナー（３１）は、自然状態ではその断面外形が、楕円、Ｄ形、Ｃ形、花丸形、歯車形等の非円形であり、
前記移動阻止手段の長さは、隣り合う軸受部材（２１、２２）の離隔距離に設定されていることを特徴とする請求項１に記載の携帯型作業機の伝動軸支持構造。 Said movement preventing means is provided at its inner peripheral surface is pressed into the said operating rod (2) Contact have been the driving source non-drive-source side than the bearing member disposed at a position closest to (6) (21) in the Consists of a liner ( 31 ) with shape restoring force that is resiliently pressed,
The liner (31) constituting the movement preventing means has a non-circular outer shape in a natural state, such as an ellipse, a D shape, a C shape, a flower round shape, a gear shape,
The transmission shaft support structure for a portable work machine according to claim 1, wherein the length of the movement blocking means is set to be a separation distance between adjacent bearing members (21, 22). 前記移動阻止手段は、前記操作桿（２）内において前記駆動源（６）に最も近い位置に配置されている軸受部材（２１）より反駆動源側に圧入されてその内周面に弾発的に圧接する形状復元力を持つライナー（３３）で構成され、
前記移動阻止手段を構成するライナー（３３）は、自然状態ではその断面外形が、複数の突条（３３ａ）を有する星形、スクリュー形、プロペラ形等であり、
前記移動阻止手段の長さは、隣り合う軸受部材（２１、２２）の離隔距離に設定されていることを特徴とする請求項１に記載の携帯型作業機の伝動軸支持構造。 Said movement preventing means is provided at its inner peripheral surface is pressed into the said operating rod (2) Contact have been the driving source non-drive-source side than the bearing member disposed at a position closest to (6) (21) in the Consists of a liner ( 33 ) with shape restoring force that presses elastically,
The liner (33) constituting the movement preventing means has a star shape, a screw shape, a propeller shape, and the like having a plurality of protrusions (33a) in a cross-sectional outer shape in a natural state.
The transmission shaft support structure for a portable work machine according to claim 1, wherein the length of the movement blocking means is set to be a separation distance between adjacent bearing members (21, 22). 前記移動阻止手段は、前記操作桿（２）内において前記駆動源（６）に最も近い位置に配置されている軸受部材（２１）より反駆動源側に挿入される外形縮小可能でかつ形状復元力を持つ、断面外形がハット形の操作桿内周面形状と相似しない形状で所定の長さを持つ板ばね状部材（３４）で構成されていることを特徴とする請求項１に記載の携帯型作業機の伝動軸支持構造。 Said movement preventing means, said operating rod (2) and a contour reducible be inserted into non-drive-source side than the bearing member disposed closest to you have the driving source (6) (21) in the The plate spring-like member (34) having a predetermined length and having a shape restoring force and having a cross-sectional outer shape that is not similar to the shape of the inner peripheral surface of the hat-shaped operating rod. The transmission shaft support structure of the portable work machine as described. 前記移動阻止手段の反駆動源側への移動を阻止する係止手段（３２）が設けられていることを特徴とする請求項２又は４に記載の携帯型作業機の伝動軸支持構造。   The transmission shaft support structure for a portable work machine according to claim 2 or 4, further comprising a locking means (32) for preventing the movement blocking means from moving to the side opposite to the driving source. 前記移動阻止手段は、前記操作桿（２）の外側から内方に向けて形成されたカシメ突起、前記操作桿（２）の外側からねじ込まれるねじ部材（３５）、前記操作桿の一部を外側から縮径してなる縮径部等で構成されていることを特徴とする請求項１に記載の携帯型作業機の伝動軸支持構造。   The movement preventing means includes a caulking projection formed from the outside to the inside of the operation rod (2), a screw member (35) screwed from the outside of the operation rod (2), and a part of the operation rod. 2. The transmission shaft support structure for a portable work machine according to claim 1, wherein the transmission shaft support structure is constituted by a reduced diameter portion or the like that is reduced in diameter from the outside.
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US8620181B2 (en) 2010-05-19 2013-12-31 Canon Kabushiki Kaisha Process cartridge and electrophotographic image forming apparatus
DE112019007868T5 (en) 2019-10-31 2022-08-11 Honda Motor Co., Ltd. work machine
DE112019007867T5 (en) 2019-10-31 2022-08-11 Honda Motor Co., Ltd. PORTABLE WORK MACHINE

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JP5529213B2 (en) * 2012-06-27 2014-06-25 本田技研工業株式会社 Detent device
KR102032766B1 (en) * 2019-03-28 2019-10-16 신경조 Absorbing vibration apparatus for axis of rotation

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JPS5323739U (en) * 1976-08-09 1978-02-28
JPH0516896Y2 (en) * 1989-04-26 1993-05-07
JP2004081176A (en) * 2002-08-29 2004-03-18 Kioritz Corp Operation rod and bearing structure of the same
JP4188177B2 (en) * 2003-08-08 2008-11-26 株式会社共立 Portable brush cutter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8620181B2 (en) 2010-05-19 2013-12-31 Canon Kabushiki Kaisha Process cartridge and electrophotographic image forming apparatus
DE112019007868T5 (en) 2019-10-31 2022-08-11 Honda Motor Co., Ltd. work machine
DE112019007867T5 (en) 2019-10-31 2022-08-11 Honda Motor Co., Ltd. PORTABLE WORK MACHINE

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