JP2005024009A - Bearing structure of bush cutter - Google Patents

Bearing structure of bush cutter Download PDF

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Publication number
JP2005024009A
JP2005024009A JP2003190288A JP2003190288A JP2005024009A JP 2005024009 A JP2005024009 A JP 2005024009A JP 2003190288 A JP2003190288 A JP 2003190288A JP 2003190288 A JP2003190288 A JP 2003190288A JP 2005024009 A JP2005024009 A JP 2005024009A
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Japan
Prior art keywords
bearing
output shaft
bevel gear
oil
bearings
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JP2003190288A
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JP4341815B2 (en
Inventor
Makoto Warashina
誠 藁科
Hideshi Sasaki
英志 佐々木
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2003190288A priority Critical patent/JP4341815B2/en
Priority to EP04013637A priority patent/EP1493317B1/en
Priority to DE602004002038T priority patent/DE602004002038T2/en
Priority to US10/867,866 priority patent/US7360312B2/en
Publication of JP2005024009A publication Critical patent/JP2005024009A/en
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Publication of JP4341815B2 publication Critical patent/JP4341815B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2310/00—Agricultural machines

Abstract

<P>PROBLEM TO BE SOLVED: To provide the bearing structure of a bush cutter of which lubricity of a slide bearing is improved. <P>SOLUTION: A second bearing 73 comprises an output shaft journal bearing 84 engaging with an output shaft 67, and an oil feeding hole 91 penetrating to front and rear surfaces 86 and 87 of the main body of the second bearing. The output shaft 67 comprises an oil transportation path 98 which penetrates from an upper end surface 95 where the second bearing 73 exists to the outer peripheral surfaces 96 and 97 contacting to the second and third bearings 73 and 74. If the fluidity of a grease improves due to rotation, it passes through the oil feeding hole of the second bearing, and reaches the end surface of the output shaft. The grease is guided through the oil transportation path, and reaches the outer peripheral surface contacting the second and third bearings. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は刈払機の刈払機の軸受構造に関する。
【０００２】
【従来の技術】
従来の刈払機の軸受構造は、刈刃を回転させる軸に対して、交差するように駆動源からの軸を配置し、この軸に嵌合したベベルギヤをすべり軸受で支持した（例えば、特許文献１参照。）。
【０００３】
【特許文献１】
実開昭５９−１５７１１６号公報 （第３頁、第２図）
【０００４】
特許文献１を、図面を参照の上、詳しく説明する。
図９は従来の芝刈機等の軸受装置の説明図であり、特許文献１の第２図である。
従来の軸受装置８は、パイプ製操作杆１内にベベルギヤ４を取り付けるもので、焼結含有軸受８１にニードルベアリング８３を嵌め、また、焼結含有軸受８１に軸受孔８２を形成することで、ニードルベアリング８３でラジアル荷重を受け、軸受孔８２側の端部でスラスト荷重を受けることができるというものである。
【０００５】
【発明が解決しようとする課題】
しかし、上記図９に示す特許文献１の軸受装置８では、軸受装置８に対する潤滑油の不足が起きやすい。特に、焼結含有軸受８１の軸受孔８２やスラスト荷重を受ける端部では、下方に較べ上方は油膜が無くなりやすい。
【０００６】
そこで、本発明の目的は、すべり軸受の潤滑性の向上を図れる刈払機の軸受構造を提供することにある。
【０００７】
【課題を解決するための手段】
上記目的を達成するために請求項１は、操作杆の先端に刈刃を設け、操作杆の内部に駆動軸を通し、この駆動軸で刈刃を回転させる刈払機において、駆動源に接続した駆動軸によって回転するとともにギヤボックス内に配置した主動ベベルギヤと、この主動ベベルギヤに噛合わせる従動ベベルギヤと、主動ベベルギヤを受ける第１軸受と、従動ベベルギヤで回転する出力軸の両端を受ける第２・第３軸受と、を備え、出力軸に刈刃を取り付けたものであって、第２軸受は、出力軸に嵌合するジャーナル軸受と、第２軸受の本体の表裏面に貫通させた油送通孔とを備え、出力軸は、第２軸受が位置する端面から第２・第３軸受が接触する外周面に貫通させた油搬送通路を備えたことを特徴とする。
【０００８】
ギヤボックス内の主動ベベルギヤ、従動ベベルギヤや出力軸の回転により、グリースの流動性がよくなると、流動性がよくなったグリースは第２軸受の本体の表裏面に貫通させた油送通孔を通り抜け、出力軸の端面に達する。端面に達したグリースは油搬送通路に導かれて、第２・第３軸受が接触する外周面に達する。上方ではジャーナル軸受に開けた孔によってジャーナル軸受の外周面に供給することができる。
【０００９】
【発明の実施の形態】
本発明の実施の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る刈払機の側面図であり、刈払機１０は、パイプ状の操作杆１１の内部１２に駆動軸１３を通し、この駆動軸１３を操作杆１１の端１４に設けた駆動源１５で回転させることで、操作杆１１の先端１６に設けた刈刃１７を回転させる形式のもので、操作杆１１の長手（矢印ａの方向）の中央部２１にハンドル２２を十文字を呈するようにハンドルホルダー２３で固定したものである。２４はギヤボックスを示す。
駆動源１５はエンジン又は電動モータである。
【００１０】
図２は図１の２矢視図であり、ギヤボックス２４を示すとともに、ギヤボックス２４内に駆動軸１３で回転を伝え、刈刃１７を回転させることを示す。ギヤボックス２４には、グリース注入口２６を形成し、グリース注入口２６にグリースポンプを接続してギヤボックス２４内にグリースを圧入することで、軸受に供給する。
【００１１】
図３は図２の３−３線断面図である。
刈払機１０は、主動機構２８と、従動機構２９を備える。主動機構２８は第１軸受としての軸受手段３１を備え、軸受手段３１は、ジャーナル軸受３４と、ねじ込式支持部材３５とからなる。すなわち、刈払機１０は、駆動軸１３と刈刃１７とを主動ベベルギヤ３２を内蔵したギヤボックス２４で連結し、主動ベベルギヤ３２のボス３３はジャーナル軸受３４で支持させ、ギヤボックス２４内部にねじ嵌合し回転（ｂ軸方向）させることで軸方向（矢印ｄの方向）の位置を調整することができるねじ込式支持部材３５を取り付け、この支持部材３５にジャーナル軸受３４を支持させたものである。
【００１２】
ギヤボックス２４は、操作杆１１に嵌合する第１ボックス部３６に第２ボックス部３７を一体に成形したもので、第１ボックス部３６に嵌合穴３８及び第１めねじ３９を形成し、第２ボックス部３７に第２めねじ４１、上述したグリース注入口２６を形成した。
【００１３】
主動ベベルギヤ３２は、中央にボス３３を形成し、ボス３３にスプライン４３を形成した。
図中、４４，４５は第１・第２リング部材、４７，４８は第３・第４リング部材、５１は止め輪を示す。
【００１４】
ジャーナル軸受３４は、油孔５２と内周面５６を有する。
ねじ込式支持部材３５は、ギヤボックス２４に嵌合する嵌合部５３と、おねじ５４と、主動ベベルギヤ３２が位置する端面５５から内周面５６、詳しくはジャーナル軸受３４の内周面５６へ貫通する第１流路５７と、操作杆１１が位置する側の周端部５８に形成した掛合部５９とを備える。６１はゆるみ止め部材を示す。
第１流路５７は、環状に形成した流路部６２と、流路部６２に連通させた孔部６３と、油孔５２とからなる。
【００１５】
従動機構２９は、主動ベベルギヤ３２に噛合わせる従動ベベルギヤ６６と、従動ベベルギヤ６６を支持するとともに従動ベベルギヤ６６で回転する出力軸６７と、出力軸６７の両端７１、７２を受ける第２・第３軸受７３、７４と、を備えた。
【００１６】
第２軸受７３は、出力軸６７に嵌合する出力軸ジャーナル軸受８４と、第２軸受７３の本体８５の表裏面８６、８７に貫通させた油送通孔９１とを備える。
第３軸受７４は、ジャーナル軸受９２を備える。
【００１７】
出力軸６７は、第２軸受７３が位置する上端面９５から第２・第３軸受７３、７４が接触する外周面９６、９７に貫通させた油搬送通路９８を備える。
【００１８】
図４は図３の４−４線断面図であり、ねじ込式支持部材３５の周端部５８に形成した掛合部５９と、ゆるみ止め部材６１に形成した工具を掛合するための凹部１０１を示す。
掛合部５９は、ねじ込式支持部材３５を取り付ける際にねじ込み工具を掛合する部位である。
【００１９】
図５は図３の５−５線断面図であり、ねじ込式支持部材３５に形成した第１流路５７の流路部６２並びに４個の孔部６３・・・（・・・は複数を示す。以下同様。）と、ジャーナル軸受３４に形成した４個の油孔５２・・・と、を示す。
【００２０】
図６は本発明に係る第１軸受のねじ込式支持部材及びジャーナル軸受の斜視図である。
ねじ込式支持部材３５は、既に説明したように、ギヤボックスに嵌合する嵌合部５３と、おねじ５４と、端面５５から内周面５６へ貫通する第１流路５７の流路部６２と、孔部６３・・・と、油孔５２と、周端部５８に形成した掛合部５９とを備える。
端面５５には、孔部６３に連通する溝１０２・・・及び位置決め凸部１０３，１０３を形成した。
溝１０２は、油を導く溝で、外周側に位置し、第２リング部材４５に干渉しない開口１０４から油が流入する。
【００２１】
第２リング部材４５は、位置決め凸部１０３，１０３に嵌合する位置決め孔１０５，１０５を有する。
なお、第１・第２リング部材４４，４５の２枚を用いたが、リング部材の枚数や厚さは任意である。
【００２２】
図７は本発明に係る第２軸受の取り付け要領説明図であり、要領を簡単に説明する。
まず、ギヤボックス２４に従動機構２９をセットする。すなわち、従動ベベルギヤ６６、出力軸６７及びその他を一体にして嵌め込んだ後、第２軸受７３をねじ込むことで、固定する。なお、出力軸６７に形成した油搬送通路９８で第２軸受７３に潤滑油を導く。
【００２３】
以上に述べた刈払機の軸受構造の作用を次に説明する。
図８は本発明に係る刈払機の軸受構造の作用図である。
ギヤボックス２４内にグリース注入口２６からグリースＧ（点で示す。）を規定量入れる。そして、刈払機１０で雑草を刈ると、主動ベベルギヤ３２、従動ベベルギヤ６６や出力軸６７の回転により、ギヤボックス２４内の温度が上昇し、ギヤボックス２４内のグリースＧは流動性がよくなる。流動性がよくなったグリースＧは、主動・従動ベベルギヤ３２，６６や出力軸６７の遠心力によって、第２ボックス部３７では、第２軸受７３の表裏面８６、８７に貫通させた油送通孔９１を伝って矢印▲１▼の如く通り抜け、出力軸６７の上端面９５に矢印▲２▼のように達する。上端面９５に達したグリースＧは油搬送通路９８に導かれて、第２・第３軸受７３、７４が接触する外周面９６、９７に矢印▲３▼，▲４▼のように達する。
【００２４】
一方、第１ボックス部３６では、流動性がよくなったグリースＧは、主動・従動ベベルギヤ３２，６６や出力軸６７の遠心力によって、溝１０２・・・の開口１０４・・・を矢印▲５▼，▲５▼の如く通り抜け、さらに、第１流路５７によって導かれ、ジャーナル軸受３４の内周面５６にグリースＧを矢印▲６▼，▲６▼のように供給することができる。
【００２５】
尚、本発明の実施の形態に示した構成部品の材質は任意である。
流路や孔や溝の数量や寸法は任意であり、所望の量の油（グリース）を導く形態であればよい。
本発明の実施の形態を刈払機以外の機械に用いることも可能である。
【００２６】
【発明の効果】
本発明は上記構成により次の効果を発揮する。
請求項１では、第２軸受は、出力軸に嵌合するジャーナル軸受と、第２軸受の本体の表裏面に貫通させた油送通孔とを備え、出力軸は、第２軸受が位置する端面から第２・第３軸受が接触する外周面に貫通させた油搬送通路を備えたので、主動ベベルギヤ、従動ベベルギヤや出力軸の回転により、グリースの流動性がよくなると、第２軸受の本体の表裏面に貫通させた油送通孔を通り抜け、出力軸の端面に達する。端面に達したグリースは油搬送通路に導かれて、第２・第３軸受が接触する外周面に達する。従って、すべり軸受の潤滑性の向上を図ることができる。
【図面の簡単な説明】
【図１】本発明に係る刈払機の側面図
【図２】図１の２矢視図
【図３】図２の３−３線断面図
【図４】図３の４−４線断面図
【図５】図３の５−５線断面図
【図６】本発明に係る第１軸受のねじ込式支持部材及びジャーナル軸受の斜視図
【図７】本発明に係る第２軸受の取り付け要領説明図
【図８】本発明に係る刈払機の軸受構造の作用図
【図９】従来の芝刈機等の軸受装置の説明図
【符号の説明】
１０…刈払機、１１…操作杆、１３…駆動軸、１５…駆動源、１６…先端、１７…刈刃、２４…ギヤボックス、６５…従動ベベルギヤ、６７…出力軸、７３…第２軸受、７４…第３軸受、８１…第２軸受のジャーナル軸受の内周面、８２…第２軸受のジャーナル軸受の外周面、８４…第２軸受のジャーナル軸受（出力軸ジャーナル軸受）、８５…本体、８６…本体の表面、８７…本体の裏面、９１…油送通孔、９５…出力軸の上端面、９６…第２軸受が接触する外周面、９７…第３軸受が接触する外周面、９８…油搬送通路。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brush cutter bearing structure of a brush cutter.
[0002]
[Prior art]
In a conventional brush cutter bearing structure, a shaft from a drive source is arranged so as to intersect with a shaft for rotating a cutting blade, and a bevel gear fitted to the shaft is supported by a slide bearing (for example, Patent Documents). 1).
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 59-157116 (Page 3, Fig. 2)
[0004]
Patent Document 1 will be described in detail with reference to the drawings.
FIG. 9 is an explanatory view of a conventional bearing device such as a lawn mower and is a second view of Patent Document 1. FIG.
The conventional bearing device 8 is for attaching the bevel gear 4 in the pipe operating rod 1, and by fitting the needle bearing 83 to the sintered bearing 81 and forming the bearing hole 82 in the sintered bearing 81, A radial load can be received by the needle bearing 83 and a thrust load can be received by the end portion on the bearing hole 82 side.
[0005]
[Problems to be solved by the invention]
However, in the bearing device 8 of Patent Document 1 shown in FIG. In particular, in the bearing hole 82 of the sintered bearing 81 and the end receiving the thrust load, the oil film tends to disappear in the upper part as compared with the lower part.
[0006]
Accordingly, an object of the present invention is to provide a bearing structure for a brush cutter that can improve the lubricity of a slide bearing.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to a first aspect of the present invention, there is provided a cutting blade provided with a cutting blade at the tip of the operating rod, a driving shaft passing through the inside of the operating rod, and the cutting blade rotating with the driving shaft connected to a driving source A driven bevel gear that is rotated by the drive shaft and disposed in the gear box, a driven bevel gear that meshes with the driven bevel gear, a first bearing that receives the driven bevel gear, and second and second shafts that receive both ends of the output shaft rotated by the driven bevel gear. 3 bearings, with a cutting blade attached to the output shaft, the second bearing is a journal bearing fitted to the output shaft, and an oil feed penetrating the front and back surfaces of the main body of the second bearing The output shaft is provided with an oil conveyance passage that is penetrated from an end surface where the second bearing is located to an outer peripheral surface where the second and third bearings are in contact.
[0008]
When the fluidity of the grease improves due to rotation of the main and driven bevel gears and the output shaft in the gear box, the improved fluidity passes through the oil feed holes that penetrate the front and back surfaces of the main body of the second bearing. Reach the end face of the output shaft. The grease that has reached the end surface is guided to the oil conveyance passage and reaches the outer peripheral surface where the second and third bearings come into contact. Above, it can be supplied to the outer peripheral surface of the journal bearing by a hole formed in the journal bearing.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a side view of a brush cutter according to the present invention. The brush cutter 10 passes a drive shaft 13 through an interior 12 of a pipe-shaped operating rod 11, and this driving shaft 13 is provided at an end 14 of the operating rod 11. By rotating it with the drive source 15, the type of the cutting blade 17 provided at the tip 16 of the operating rod 11 is rotated. A handle 22 is attached to the center portion 21 of the operating rod 11 in the longitudinal direction (in the direction of arrow a). It is fixed with the handle holder 23 as shown. Reference numeral 24 denotes a gear box.
The drive source 15 is an engine or an electric motor.
[0010]
FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1, showing the gear box 24 and transmitting the rotation by the drive shaft 13 into the gear box 24 to rotate the cutting blade 17. A grease injection port 26 is formed in the gear box 24, a grease pump is connected to the grease injection port 26, and grease is press-fitted into the gear box 24 to be supplied to the bearing.
[0011]
3 is a cross-sectional view taken along line 3-3 of FIG.
The brush cutter 10 includes a main driving mechanism 28 and a driven mechanism 29. The main driving mechanism 28 includes a bearing means 31 as a first bearing, and the bearing means 31 includes a journal bearing 34 and a screw-type support member 35. That is, the brush cutter 10 connects the drive shaft 13 and the cutting blade 17 with a gear box 24 containing a main driving bevel gear 32, the boss 33 of the main driving bevel gear 32 is supported by a journal bearing 34, and is screwed into the gear box 24. A screw-type support member 35 that can adjust the position in the axial direction (in the direction of the arrow d) by rotating (b-axis direction) is attached, and the journal bearing 34 is supported on the support member 35. is there.
[0012]
The gear box 24 is formed by integrally forming a second box portion 37 with a first box portion 36 that is fitted to the operation rod 11, and a fitting hole 38 and a first female screw 39 are formed in the first box portion 36. The second female screw 41 and the above-described grease injection port 26 are formed in the second box portion 37.
[0013]
The main bevel gear 32 has a boss 33 formed at the center and a spline 43 formed on the boss 33.
In the figure, 44 and 45 are first and second ring members, 47 and 48 are third and fourth ring members, and 51 is a retaining ring.
[0014]
The journal bearing 34 has an oil hole 52 and an inner peripheral surface 56.
The screw-in support member 35 includes an inner peripheral surface 56 from an end surface 55 where the fitting portion 53 that engages with the gear box 24, a male screw 54, and the main driving bevel gear 32 is located, specifically, an inner peripheral surface 56 of the journal bearing 34. A first flow path 57 penetrating through and a hooking portion 59 formed at the peripheral end 58 on the side where the operating rod 11 is located. Reference numeral 61 denotes a locking member.
The first flow path 57 includes a flow path portion 62 formed in an annular shape, a hole portion 63 communicated with the flow path portion 62, and an oil hole 52.
[0015]
The driven mechanism 29 includes a driven bevel gear 66 that meshes with the driven bevel gear 32, an output shaft 67 that supports the driven bevel gear 66 and rotates with the driven bevel gear 66, and second and third bearings that receive both ends 71 and 72 of the output shaft 67. 73, 74.
[0016]
The second bearing 73 includes an output shaft journal bearing 84 that is fitted to the output shaft 67, and an oil feed hole 91 that penetrates through the front and back surfaces 86 and 87 of the main body 85 of the second bearing 73.
The third bearing 74 includes a journal bearing 92.
[0017]
The output shaft 67 includes an oil conveyance passage 98 that penetrates from the upper end surface 95 where the second bearing 73 is located to the outer peripheral surfaces 96 and 97 that the second and third bearings 73 and 74 contact.
[0018]
4 is a cross-sectional view taken along line 4-4 of FIG. 3, and includes a hook 59 formed on the peripheral end 58 of the screw-type support member 35 and a recess 101 for hooking the tool formed on the locking member 61. Show.
The hooking portion 59 is a portion for hooking a screwing tool when the screwing type support member 35 is attached.
[0019]
5 is a cross-sectional view taken along the line 5-5 in FIG. 3, and the flow path portion 62 of the first flow path 57 formed in the screw-type support member 35 and the four hole portions 63... The same applies hereinafter) and four oil holes 52 formed in the journal bearing 34.
[0020]
FIG. 6 is a perspective view of the screw-type support member of the first bearing and the journal bearing according to the present invention.
As described above, the screw-type support member 35 includes the fitting portion 53 that fits into the gear box, the male screw 54, and the flow passage portion of the first flow passage 57 that penetrates from the end surface 55 to the inner peripheral surface 56. 62, a hole 63..., An oil hole 52, and a hook 59 formed in the peripheral end 58.
On the end surface 55, grooves 102... Communicating with the hole 63 and positioning convex portions 103, 103 were formed.
The groove 102 is a groove that guides oil, is located on the outer peripheral side, and the oil flows from the opening 104 that does not interfere with the second ring member 45.
[0021]
The second ring member 45 has positioning holes 105 and 105 that fit into the positioning convex portions 103 and 103.
Although the first and second ring members 44 and 45 are used, the number and thickness of the ring members are arbitrary.
[0022]
FIG. 7 is an explanatory view of the installation procedure of the second bearing according to the present invention, and the procedure will be briefly described.
First, the driven mechanism 29 is set. That is, after the driven bevel gear 66, the output shaft 67, and others are fitted together, the second bearing 73 is screwed in and fixed. Note that the lubricating oil is guided to the second bearing 73 through the oil conveyance passage 98 formed in the output shaft 67.
[0023]
Next, the operation of the bushing bearing structure described above will be described.
FIG. 8 is an operational view of the bearing structure of the brush cutter according to the present invention.
A prescribed amount of grease G (shown by dots) is put into the gear box 24 from the grease inlet 26. When the weeder 10 cuts the weeds, the temperature in the gear box 24 increases due to the rotation of the main driving bevel gear 32, the driven bevel gear 66, and the output shaft 67, and the grease G in the gear box 24 is improved in fluidity. The grease G having improved fluidity is passed through the front and back surfaces 86 and 87 of the second bearing 73 in the second box portion 37 by the centrifugal force of the main and driven bevel gears 32 and 66 and the output shaft 67. It passes through the hole 91 as shown by arrow (1), and reaches the upper end surface 95 of the output shaft 67 as shown by arrow (2). The grease G reaching the upper end surface 95 is guided to the oil conveying passage 98 and reaches the outer peripheral surfaces 96 and 97 where the second and third bearings 73 and 74 come in contact as indicated by arrows (3) and (4).
[0024]
On the other hand, in the first box portion 36, the grease G having improved fluidity passes through the openings 104... Of the grooves 102. It passes through as indicated by ▼ and ▲ 5, and is further guided by the first flow path 57, so that the grease G can be supplied to the inner peripheral surface 56 of the journal bearing 34 as indicated by arrows ▲ 6 and ６6.
[0025]
In addition, the material of the component shown in the embodiment of the present invention is arbitrary.
The number and dimensions of the flow paths, holes, and grooves are arbitrary, and any form that guides a desired amount of oil (grease) may be used.
It is also possible to use the embodiment of the present invention for a machine other than a brush cutter.
[0026]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
According to a first aspect of the present invention, the second bearing includes a journal bearing that fits into the output shaft, and an oil feed hole that penetrates through the front and back surfaces of the main body of the second bearing, and the second shaft is positioned on the output shaft. Since the oil conveyance passage is made to penetrate from the end surface to the outer peripheral surface where the second and third bearings come into contact with each other, if the fluidity of the grease is improved by the rotation of the driven bevel gear, the driven bevel gear or the output shaft, the body of the second bearing Passes through the oil feed hole that penetrates the front and back surfaces of and reaches the end face of the output shaft. The grease that has reached the end surface is guided to the oil conveyance passage and reaches the outer peripheral surface where the second and third bearings come into contact. Therefore, the lubricity of the sliding bearing can be improved.
[Brief description of the drawings]
FIG. 1 is a side view of a brush cutter according to the present invention. FIG. 2 is a sectional view taken along arrow 2 in FIG. 1. FIG. 3 is a sectional view taken along line 3-3 in FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 3. FIG. 6 is a perspective view of the screw-type support member and journal bearing of the first bearing according to the present invention. Explanatory diagram [FIG. 8] Operational diagram of the bearing structure of a brush cutter according to the present invention [FIG. 9] Explanatory diagram of a conventional bearing device such as a lawn mower [Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Brush cutter, 11 ... Operation rod, 13 ... Drive shaft, 15 ... Drive source, 16 ... Tip, 17 ... Cutting blade, 24 ... Gear box, 65 ... Driven bevel gear, 67 ... Output shaft, 73 ... Second bearing, 74 ... third bearing, 81 ... inner peripheral surface of journal bearing of second bearing, 82 ... outer peripheral surface of journal bearing of second bearing, 84 ... journal bearing of second bearing (output shaft journal bearing), 85 ... main body, 86... Main body surface 87. Main body rear surface 91. Oil passage hole 95. Upper end surface of output shaft 96. Outer peripheral surface in contact with second bearing 97 97 Outer peripheral surface in contact with third bearing 98 ... oil transport passage.

Claims (1)

操作杆の先端に刈刃を設け、操作杆の内部に駆動軸を通し、この駆動軸で前記刈刃を回転させる刈払機において、
駆動源に接続した前記駆動軸によって回転するとともにギヤボックス内に配置した主動ベベルギヤと、この主動ベベルギヤに噛合わせる従動ベベルギヤと、前記主動ベベルギヤを受ける第１軸受と、従動ベベルギヤで回転する出力軸の両端を受ける第２・第３軸受と、を備え、出力軸に前記刈刃を取り付けたものであって、
前記第２軸受は、前記出力軸に嵌合するジャーナル軸受と、第２軸受の本体の表裏面に貫通させた油送通孔とを備え、 前記出力軸は、第２軸受が位置する端面から前記第２・第３軸受が接触する外周面に貫通させた油搬送通路を備えたことを特徴とする刈払機の軸受構造。In a brush cutter that provides a cutting blade at the tip of the operating rod, passes a driving shaft through the operating rod, and rotates the cutting blade with the driving shaft.
A main drive bevel gear that is rotated by the drive shaft connected to the drive source and is disposed in the gear box, a driven bevel gear that meshes with the main drive bevel gear, a first bearing that receives the main drive bevel gear, and an output shaft that is rotated by the driven bevel gear. Second and third bearings for receiving both ends, wherein the cutting blade is attached to the output shaft,
The second bearing includes a journal bearing that fits into the output shaft, and an oil feed hole that penetrates through the front and back surfaces of the main body of the second bearing, and the output shaft extends from an end surface where the second bearing is located. 2. A brush cutter bearing structure comprising an oil conveyance passage that penetrates through an outer peripheral surface in contact with the second and third bearings.
JP2003190288A 2003-07-02 2003-07-02 Brush cutter bearing structure Expired - Fee Related JP4341815B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2003190288A JP4341815B2 (en) 2003-07-02 2003-07-02 Brush cutter bearing structure
EP04013637A EP1493317B1 (en) 2003-07-02 2004-06-09 Bush cutter
DE602004002038T DE602004002038T2 (en) 2003-07-02 2004-06-09 bush-cutting
US10/867,866 US7360312B2 (en) 2003-07-02 2004-06-15 Bush cutter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003190288A JP4341815B2 (en) 2003-07-02 2003-07-02 Brush cutter bearing structure

Publications (2)

Publication Number Publication Date
JP2005024009A true JP2005024009A (en) 2005-01-27
JP4341815B2 JP4341815B2 (en) 2009-10-14

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015128395A (en) * 2014-01-08 2015-07-16 株式会社クボタ Walk type mower
JP5985692B1 (en) * 2015-03-27 2016-09-06 本田技研工業株式会社 Shaft drive type vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015128395A (en) * 2014-01-08 2015-07-16 株式会社クボタ Walk type mower
JP5985692B1 (en) * 2015-03-27 2016-09-06 本田技研工業株式会社 Shaft drive type vehicle

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