JP6211388B2 - Intake device for engine working machine - Google Patents
Intake device for engine working machine Download PDFInfo
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- JP6211388B2 JP6211388B2 JP2013220966A JP2013220966A JP6211388B2 JP 6211388 B2 JP6211388 B2 JP 6211388B2 JP 2013220966 A JP2013220966 A JP 2013220966A JP 2013220966 A JP2013220966 A JP 2013220966A JP 6211388 B2 JP6211388 B2 JP 6211388B2
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/02—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for hand-held tools
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/04—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices
- F02M35/06—Air cleaners specially arranged with respect to engine, to intake system or specially adapted to vehicle; Mounting thereon ; Combinations with other devices combined or associated with engine's cooling blower or fan, or with flywheel
Description
本発明は、チェンソーなど作業時に切削屑等のダストを発生する作業機であって、エンジンを動力源とするエンジン作業機に関する。 The present invention relates to a working machine that generates dust such as cutting waste during work, such as a chain saw, and relates to an engine working machine that uses an engine as a power source.
チェンソー等においては、作業時に本体の周辺に木材の切削屑（ダスト）が大量に発生し、エンジン吸気系のエアクリーナのフィルタがダストによる目詰まりを生じやすく、清掃作業やフィルタの交換作業を頻繁に行う必要がある。 In chain saws, a large amount of wood cutting dust (dust) is generated around the main body during work, and the air cleaner filter of the engine intake system tends to be clogged with dust, so cleaning and filter replacement work are frequent. There is a need to do.
このため、特許文献１では、エンジンの冷却ファン５により送風される冷却用空気の中からダストの少ないファンケース内周側の空気の一部をエアクリーナの吸入口に導いて、フィルタの目詰まり抑制を図っている。 For this reason, in Patent Document 1, a part of the air on the inner peripheral side of the fan case with less dust out of the cooling air blown by the cooling fan 5 of the engine is guided to the air cleaner inlet to suppress clogging of the filter. I am trying.
特許文献１に記載のものでは、冷却空気の一部を取り入れる取入口を覆って遮蔽部材が突出して配設されている。このため、空気流が遮蔽部材に当たり、また、空気流と逆向きに空気を取り入れるので空気流に乱れを生じやすく、該乱れによって切削屑が拡散して取入口から進入し、ダスト分離機能が損なわれていた。
また、冷却空気の流動抵抗が増大して冷却性能が損なわれることもあった。
In the thing of patent document 1, the shielding member protrudes and is arrange | positioned covering the intake port which takes in some cooling air. For this reason, the air flow hits the shielding member, and the air is taken in the opposite direction to the air flow, so that the air flow is likely to be turbulent. It was.
In addition, the flow resistance of the cooling air is increased and the cooling performance is sometimes impaired.
本発明は、このような従来の課題に着目してなされたもので、冷却用空気流の乱れを抑制しつつ冷却空気の一部をエンジン吸入空気として取り入れることにより、冷却性能を損なうことなくダスト分離機能を向上させることを目的とする。 The present invention has been made by paying attention to such a conventional problem, and by incorporating a part of the cooling air as engine intake air while suppressing the disturbance of the cooling air flow, the dust can be collected without impairing the cooling performance. The purpose is to improve the separation function.
このため本発明は、本体ケース内に駆動用のエンジンを備え、前記本体ケースに連結されたファンカバーに、前記エンジンに連結された冷却ファンの回転で生じる冷却空気流を前記エンジンの被冷却部に導く冷却空気通路が形成されたエンジン作業機であって、
前記ファンカバーの冷却空気通路壁に前記冷却空気流の進行方向と略直交する方向に冷却空気の一部を取り入れる吸気取入口を前記エンジンに相対するように開口し、前記吸気取入口からエンジン吸気系のエアクリーナ吸入口に導く吸気導入通路を配設し、
前記吸気取入口の冷却空気上流側に隣接する冷却空気通路壁部分に、前記エンジンの被冷却部に冷却空気流を指向させるように前記冷却ファンの径方向外側に向かうほど前記エンジンに近づくように滑らかに湾曲させたガイド面を形成したことを特徴とする。
Therefore the present invention includes a engine for dynamic driving in the body case, the linked fan cover to the main case, the cooling airflow generated by rotation of connected cooling fan in the engine of the engine to be An engine working machine in which a cooling air passage leading to a cooling unit is formed,
Wherein the traveling direction and the intake inlet taking in some of the cooling air in a direction substantially perpendicular to the cooling air flow in the cooling air passage wall of the fan cover and the opening so as to face to the engine, the intake inlet or Lae An intake intake passage leading to the air cleaner intake of the engine intake system is arranged ,
A cooling air passage wall adjacent to the intake air upstream side of the intake air inlet is directed closer to the engine as it goes radially outward of the cooling fan so as to direct the cooling air flow toward the cooled portion of the engine. A guide surface that is smoothly curved is formed .
冷却空気通路壁に開口された吸気取入口から前記冷却空気流の進行方向と略直交する方向に冷却空気の一部を取り入れるため、冷却空気流に生じる乱れが抑制される。
したがって、冷却空気に含まれるダストの流れも乱れにくく吸気取入口への侵入が抑制されるため、エンジン吸入空気からのダスト分離機能が向上し、エアクリーナのフィルタの目詰まりが抑制され、清掃作業やフィルタの交換作業の頻度を低減できる。
また、冷却空気流の乱れの抑制により流動抵抗の増大が抑制され、冷却性能を良好に維持できる。
Since a part of the cooling air is taken in from the intake air inlet opened in the cooling air passage wall in a direction substantially orthogonal to the traveling direction of the cooling air flow, turbulence generated in the cooling air flow is suppressed.
Therefore, the flow of dust contained in the cooling air is not easily disturbed, and entry into the intake air intake is suppressed, so that the function of separating dust from the engine intake air is improved, clogging of the air cleaner filter is suppressed, and cleaning work and The frequency of filter replacement work can be reduced.
Moreover, the increase in flow resistance is suppressed by suppressing the disturbance of the cooling air flow, and the cooling performance can be maintained satisfactorily.
以下に図面を参照して、本発明をチェンソーに適用した実施の形態について説明する。
図１は、本発明に関わる部分を断面で示したチェンソーの概要構成を示す。
チェンソー１は、本体ケース２内部に収納されたエンジン３によってスプロケットを駆動することにより、該スプロケットとガイドバーの周縁部に巻回されたソーチェーンを走行させて、木材等の切削作業を行うようになっている。
Embodiments in which the present invention is applied to a chain saw will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a chain saw in which a portion related to the present invention is shown in cross section.
The chain saw 1 drives the sprocket by the engine 3 housed in the main body case 2 so that the sprocket and the saw chain wound around the peripheral portion of the guide bar are driven to perform cutting work of wood or the like. It has become.
エンジン３は、本体ケース２の上壁に連結されたハンドル（トップハンドル）４に配設されたレバーを操作することにより駆動を制御される。
エンジン３の駆動軸は、ソーチェーンが配設される前後方向と直交する左右方向に延び、一方の端部（左端部）には、エンジン３を冷却する冷却ファン５が連結され、冷却ファン５はエンジン３によって回転駆動される。冷却ファン５は、図２に示すように、周方向一定間隔で渦巻状に傾斜するように複数個のフィン５ａを有する。
The drive of the engine 3 is controlled by operating a lever disposed on a handle (top handle) 4 connected to the upper wall of the main body case 2.
The drive shaft of the engine 3 extends in the left-right direction perpendicular to the front-rear direction in which the saw chain is disposed, and a cooling fan 5 for cooling the engine 3 is connected to one end (left end). Is rotated by the engine 3. As shown in FIG. 2, the cooling fan 5 has a plurality of fins 5a so as to incline in a spiral shape at regular intervals in the circumferential direction.
冷却ファン５外側には、中央部が円形状に開口され、冷却ファン５の周縁部を覆うファンカバー６が配設される。図３及び図４は、ファンカバー６の内側と外側とを示す。ファンカバー６の外側には、図９に示すように、冷却空気取入口７ａが多数開口されたスタータケース７が配設され、ファンカバー６及びスタータケース７は、本体ケース２の側壁（左側側壁）に連結される。 On the outside of the cooling fan 5, a fan cover 6 is provided that has a circular opening at the center and covers the peripheral edge of the cooling fan 5. 3 and 4 show the inside and the outside of the fan cover 6. As shown in FIG. 9, a starter case 7 having a large number of cooling air inlets 7 a is provided outside the fan cover 6. The fan cover 6 and the starter case 7 are arranged on the side wall (the left side wall) of the main body case 2. ).
ファンカバー６の内側（裏側、本体３側）の周縁部には、冷却ファン５の回転で生じる冷却空気流を本体ケース２内のエンジン外壁（被冷却部）に導く環状の冷却空気通路８が形成される。
冷却空気通路８は、上端部の通路幅が狭く反時計回り方向に徐々に通路幅が増大し、後端部は、冷却空気の出口として本体ケース２の内部に向かって傾斜するように形成されている。
An annular cooling air passage 8 that guides the cooling air flow generated by the rotation of the cooling fan 5 to the engine outer wall (cooled portion) in the main body case 2 is provided at the periphery of the fan cover 6 (back side, main body 3 side). It is formed.
The cooling air passage 8 is formed so that the passage width of the upper end portion is narrow and the passage width gradually increases in the counterclockwise direction, and the rear end portion is inclined toward the inside of the main body case 2 as an outlet for the cooling air. ing.
そして、チェンソー１の作業時にエンジン３が駆動されて冷却ファン５が図１で反時計回りに回転すると、フィン５ａの回転による遠心作用で、冷却ファン５の中央部に負圧を生じる。これにより、図１及び図１０に実線矢印で示すように、外気が冷却空気取入口７ａを介してスタータケース７内に導入され、ファンカバー６の中央開口から冷却ファン５の中心部に導かれた後、渦巻状をなす複数個のフィン５ａの回転により、冷却空気通路８内を上部の幅狭な通路から反時計回りの旋回流を形成しつつ流動し、後端部の出口部から本体ケース２内部に向かって流出する。 When the engine 3 is driven during the operation of the chain saw 1 and the cooling fan 5 rotates counterclockwise in FIG. 1, a negative pressure is generated in the central portion of the cooling fan 5 due to the centrifugal action caused by the rotation of the fins 5a. As a result, as indicated by solid arrows in FIGS. 1 and 10, the outside air is introduced into the starter case 7 through the cooling air intake 7 a and is led from the central opening of the fan cover 6 to the center of the cooling fan 5. After that, the plurality of spiral fins 5a rotate to flow in the cooling air passage 8 while forming a counterclockwise swirling flow from the upper narrow passage, and from the outlet portion of the rear end portion to the main body It flows out toward the inside of the case 2.
これにより、冷却空気は、本体ケース２内に収納されたエンジン３のシリンダ外等の被冷却部に吹き付けられて該被冷却部を冷却し、さらに本体ケース２の内部を通って他の被冷却部（マフラ等）を冷却した後、図示しない出口から外部に放出される。 As a result, the cooling air is blown to a cooled portion outside the cylinder of the engine 3 housed in the main body case 2 to cool the cooled portion, and further passes through the inside of the main body case 2 to receive another cooled object. After cooling the part (muffler or the like), it is discharged to the outside from an outlet (not shown).
かかる冷却空気の中からダストの少ない空気を取り入れ、吸気としてエンジン３に供給する吸気装置が以下のように形成されている。
図３及び図４に示すように、冷却空気通路８壁の出口部分には、冷却空気の一部を取り入れる縦長スリット状の吸気取入口１０が開口され、その上方には、方形状の吸気出口１１が開口される。
ファンカバー６の外側（表側）には、吸気取入口１０及び吸気出口１１を囲んで突出する周壁１２が立設され、該周壁１２に図５、図６に示す形状を有したダクトカバー１３が図１０に示すように嵌合して密閉され、該周壁１２及びダクトカバー１３により、第１エアダクト１４（上流側の吸気導入通路）が形成される。
An intake device that takes in air with less dust from the cooling air and supplies it to the engine 3 as intake air is formed as follows.
As shown in FIGS. 3 and 4, a longitudinally slit-like intake air intake 10 for taking in a part of the cooling air is opened at the outlet portion of the cooling air passage 8 wall, and a rectangular intake air outlet is provided above the intake portion 10. 11 is opened.
On the outer side (front side) of the fan cover 6, a peripheral wall 12 that protrudes so as to surround the intake inlet 10 and the intake outlet 11 is erected, and a duct cover 13 having the shape shown in FIGS. 5 and 6 is formed on the peripheral wall 12. As shown in FIG. 10, they are fitted and sealed, and the peripheral wall 12 and the duct cover 13 form a first air duct 14 (upstream intake intake passage).
ダクトカバー１３は、スタータケース７の内壁から突出する突部７ａによって押され、これにより、周壁１２からの離脱が防止される。
吸気出口１１のファンカバー６内側に突出する周縁フランジ部には、エンジン本体に形成された中間ポート３１の入口が接合される。
中間ポート３１は上方に方形状の出口が開口され、該出口には内周面に係合突起１５ａが形成されたアダプタ１５がネジ１６により締結される。
The duct cover 13 is pushed by a protrusion 7 a protruding from the inner wall of the starter case 7, thereby preventing the duct cover 13 from being detached from the peripheral wall 12.
An inlet of an intermediate port 31 formed in the engine body is joined to a peripheral flange portion that protrudes inside the fan cover 6 of the intake outlet 11.
The intermediate port 31 has a rectangular outlet opening upward, and an adapter 15 having an engagement protrusion 15 a formed on the inner peripheral surface is fastened to the outlet by a screw 16.
一方、下流側の吸気導入通路がゴム製の第２エアダクト１７によって形成される。第２エアダクト１７は、図７及び図８に示すように四角形断面形状で、内部通路が潰れない剛性、強度を有する一方、中間部の屈曲した部分の肉厚が他の部分より薄めに形成されて容易に変形する柔軟性も有している。
該第２エアダクト１７の下端部（上流端部）には、係合溝１７ａを有した下側フランジ部１７Ａが形成され、図９に示すように、該係合溝１７ａをアダプタ１５の係合突起１５ａに係合させて、第２エアダクト１７の下側フランジ部１７Ａを、アダプタ１５を介して中間ポート３１の出口に接続する。
On the other hand, a downstream intake passage is formed by the rubber second air duct 17. As shown in FIGS. 7 and 8, the second air duct 17 has a rectangular cross-sectional shape and has rigidity and strength that prevents the internal passage from being crushed, while the thickness of the bent portion of the intermediate portion is thinner than other portions. And has the flexibility to be easily deformed.
A lower flange portion 17A having an engagement groove 17a is formed at the lower end portion (upstream end portion) of the second air duct 17, and the engagement groove 17a is engaged with the adapter 15 as shown in FIG. The lower flange portion 17 </ b> A of the second air duct 17 is connected to the outlet of the intermediate port 31 through the adapter 15 by being engaged with the protrusion 15 a.
第２エアダクト１７の上端部（下流端部）は、外周壁を先細まり状に突出させた上側フランジ部１７Ｂが形成され、図９に示すように、上側フランジ部１７Ｂをエアクリーナ９に形成された係合孔に差し込んで係合させることにより、エアクリーナ９の吸入口９ａに接続する。
このようにして、吸気取入口１０から第１エアダクト１４、中間ポート３１及び第２エアダクト１７を経てエアクリーナ９の吸入口９ａに至る吸気導入通路が構成される。
The upper end portion (downstream end portion) of the second air duct 17 is formed with an upper flange portion 17B having an outer peripheral wall projecting in a tapered shape, and the upper flange portion 17B is formed on the air cleaner 9 as shown in FIG. The air cleaner 9 is connected to the suction port 9a by being inserted into the engagement hole and engaged therewith.
In this manner, an intake air introduction passage is formed from the intake air inlet 10 through the first air duct 14, the intermediate port 31 and the second air duct 17 to the intake port 9a of the air cleaner 9.
かかる吸気導入通路によるエンジン３の吸気作用を説明する。
チェンソー１の作業時にエンジン３が駆動されると、上述したように冷却空気流が生じる。ここで、図１及び図１０に点線矢印で示すように、冷却空気通路４の出口部から本体ケース２内部に向かって流出する冷却空気流から、一部の空気が吸気負圧により吸気取入口１０から該冷却空気流の流動方向と略直角な方向に第１エアダクト１４内に吸入される。該吸入された一部の空気は、中間ポート３１、第２エアダクト１７を経てエアクリーナ９の吸入口９ａに導入され、図１１に示すエアクリーナ９のフィルタ９ｂによって除塵された後、図１に示すように、気化器１８で燃料と混合され、混合気となって吸気通路１９を介してエンジン３のシリンダ（燃焼室）内に吸入される。
The intake action of the engine 3 by the intake intake passage will be described.
When the engine 3 is driven during the operation of the chain saw 1, a cooling air flow is generated as described above. Here, as indicated by the dotted arrows in FIGS. 1 and 10, some of the air from the cooling air flow flowing out from the outlet portion of the cooling air passage 4 toward the inside of the main body case 2 is caused by the intake negative pressure. 10 is sucked into the first air duct 14 in a direction substantially perpendicular to the flow direction of the cooling air flow. The part of the sucked air is introduced into the suction port 9a of the air cleaner 9 through the intermediate port 31 and the second air duct 17, and is removed by the filter 9b of the air cleaner 9 shown in FIG. Then, the fuel is mixed with the fuel in the carburetor 18 and is mixed into the cylinder (combustion chamber) of the engine 3 through the intake passage 19.
ここで、チェンソー１の作業時は、チェンソー１の周辺にソーチェーンによって切削させた切削屑（ダスト）が多量に発生する。このため、スタータケース７内に取り込まれた冷却空気は、ダストを多く含んでいるが、冷却空気通路８を流動する際に、空気より質量の大きいダストの多くは遠心力によって冷却空気通路８の外周壁に当たり、該外周壁に沿って流下しつつ底部に溜まり、排出口から排出して除去される。このようにして、冷却空気中の切削屑を効率良く除去することができる。 Here, when the chain saw 1 is operated, a large amount of cutting waste (dust) cut by the saw chain is generated around the chain saw 1. Therefore, the cooling air taken into Sutatake scan within 7 is contains a large amount of dust, when flowing through the cooling air passage 8, many of the large dust mass from the air cooled by the centrifugal force air passage 8 It hits the outer peripheral wall, accumulates at the bottom while flowing down along the outer peripheral wall, and is discharged and removed from the outlet. In this way, the cutting waste in the cooling air can be efficiently removed.
そして、冷却空気通路８の出口部を流動する冷却空気中に残ったダストも、冷却空気の流動方向に沿った流動方向の慣性が大きいため、該流動方向とは空気取り入れ方向が略直角する吸気取入口１０から第１ダクト１４内への切削屑の進入が抑制される。 The dust remaining in the cooling air flowing through the outlet of the cooling air passage 8 also has a large inertia in the flow direction along the flow direction of the cooling air, and therefore the intake air whose air intake direction is substantially perpendicular to the flow direction. The entering of cutting waste from the intake 10 into the first duct 14 is suppressed.
また、吸気取入口１０が冷却通路面に開口され、特許文献１に開示されたような冷却空気の流動を妨げる障害物（段差を有した突起）も有しないため、冷却空気流の乱れ（ダスト流の乱れ）が抑制され、これにより、吸気取入口１０から第１ダクト１４内へのダスト進入の抑制効果をより高めることができる。 Further, since the intake air inlet 10 is opened in the cooling passage surface and does not have an obstacle (protrusion having a step) that hinders the flow of the cooling air as disclosed in Patent Document 1, the cooling air flow is disturbed (dust) (Turbulence in the flow) is suppressed, whereby the effect of suppressing dust entry from the intake port 10 into the first duct 14 can be further enhanced.
以上のように、吸気導入通路内へのダスト進入抑制効果を高められることにより、エンジン吸入空気からのダスト分離機能が向上し、エアクリーナ９のフィルタ９ｂのダストによる目詰まりが抑制され、清掃作業やフィルタの交換作業の頻度を大幅に低減でき、エンジンの耐久性も向上する。
また、上記のように、冷却空気の流動を妨げる障害物を有さず冷却空気流の乱れの抑制できることにより、流動抵抗の増大が抑制され、冷却性能を良好に維持できる。
As described above, the effect of suppressing dust intrusion into the intake air introduction passage is enhanced, so that the function of separating dust from engine intake air is improved, and clogging due to dust in the filter 9b of the air cleaner 9 is suppressed. The frequency of filter replacement work can be greatly reduced, and engine durability is improved.
In addition, as described above, since the disturbance of the cooling air flow can be suppressed without having an obstacle that hinders the flow of the cooling air, an increase in the flow resistance is suppressed, and the cooling performance can be favorably maintained.
また、本実施形態では、上記の他、以下の効果が得られる。
ダスト分離機能を有した吸気導入通路を形成するために、追加される主要部品は、ダストカバー１３及び第２エアダクト１７の２点で済み、製造及び組み立てコストを軽減できる。
また、ハンドル（トップハンドル）４はエンジン３からの振動伝達を軽減するため、エンジン本体に対して相対変位可能な構造とすることが一般的であるが、第２ダクト１７をゴム製としたため、該変位に対応できる柔軟性を有し、一方、四角形断面形状として内部通路が潰れなない剛性を容易に確保することができる。
In addition to the above, the present embodiment provides the following effects.
In order to form the intake air introduction passage having the dust separation function, two main parts are added, that is, the dust cover 13 and the second air duct 17, and the manufacturing and assembly costs can be reduced.
The handle (top handle) 4 is generally structured to be relatively displaceable with respect to the engine body in order to reduce vibration transmission from the engine 3, but the second duct 17 is made of rubber. It has flexibility to cope with the displacement, and on the other hand, it can easily ensure rigidity that the internal passage is not crushed as a square cross-sectional shape.
また、以上のように部品点数を少なくし、第２エアダクト１７を変形可能なゴム製としたこと等により、メンテナンスの回数・手間も大幅に減らすことができる。
また、ハンドル４は、気化器１８、エアクリーナ９とは一体で、エンジン本体とはゴム製の第２エアダクト１７で連結されているため、エンジン本体からの振動を遮断できる。
エアクリーナ９室を密閉できるので、吸気騒音を低減できる。
Further, by reducing the number of parts and making the second air duct 17 made of deformable rubber as described above, the number of maintenance operations and labor can be greatly reduced.
Further, since the handle 4 is integrated with the carburetor 18 and the air cleaner 9 and is connected to the engine body by a second air duct 17 made of rubber, vibration from the engine body can be blocked.
Since the air cleaner 9 can be sealed, intake noise can be reduced.
図１２〜図１４は、本発明の第２の実施形態の要部を示す。
本第２実施形態では、吸気取入口１０の冷却空気上流側に隣接するファンカバー６の冷却空気通路壁部分に、エンジンの被冷却部に冷却空気流を指向させるように冷却ファン５の径方向に沿って滑らかに湾曲させたガイド面６ａが形成される。
このようなガイド面６ａを形成したことにより、冷却空気流は、エンジン３の被冷却部、例えば、特に高温なシリンダ外壁上部の冷却フィン形成部に向かって強く吹き当たるため、冷却性能を向上できる。
12-14 shows the principal part of the 2nd Embodiment of this invention.
In the second embodiment, the radial direction of the cooling fan 5 directs the cooling air flow toward the cooled portion of the engine on the cooling air passage wall portion of the fan cover 6 adjacent to the cooling air upstream side of the intake air intake 10. A guide surface 6a that is smoothly curved is formed.
By forming such a guide surface 6a, the cooling air flow is strongly blown toward the cooled part of the engine 3, for example, the cooling fin forming part on the upper part of the outer wall of the cylinder that is particularly hot, so that the cooling performance can be improved. .
本実施形態においても、ガイド面６ａは滑らかに湾曲して形成されるため、冷却空気流の乱れは抑制され、さらに、冷却空気中のダストは吸気取入口１０からより離れる方向に流動するため、ダストの吸気取入口１０への進入抑制効果は良好に維持される。したがって、第１実施形態と同様、エアクリーナのフィルタの目詰まりが抑制され、清掃作業やフィルタの交換作業の頻度を低減でき、エンジン３の耐久性を向上できる。 Also in this embodiment, since the guide surface 6a is formed to be smoothly curved, the disturbance of the cooling air flow is suppressed, and further, dust in the cooling air flows in a direction further away from the intake air inlet 10, The effect of suppressing the entry of dust into the intake port 10 is maintained well. Therefore, as in the first embodiment, clogging of the air cleaner filter is suppressed, the frequency of cleaning work and filter replacement work can be reduced, and the durability of the engine 3 can be improved.
その他の、第１実施形態で得られる効果は、第２実施形態においても同様に得られる。
また、本発明は、チェンソーの他、ヘッジトリマー、ブロワなど、作業によってダストを発生するエンジン作業機、あるいは、外気中にダストの多い環境で使用されるあらゆるエンジン作業機に適用することができる。
出願当初の請求項は以下の通りであった。
［請求項１］
本体ケース内にエンジンを備え、前記本体ケースに連結されたファンカバーに、前記エンジンに連結された冷却用ファンの回転で生じる冷却空気流を前記エンジンの被冷却部に導く冷却空気通路が形成されたエンジン作業機であって、
前記ファンカバーの冷却空気通路壁に前記冷却空気流の進行方向と略直交する方向に冷却空気の一部を取り入れる吸気取入口を開口し、前記吸気取入口からエンジン吸気系のエアクリーナ吸入口に導く吸気導入通路を配設したことを特徴とするエンジン作業機の吸気装置。
［請求項２］
前記吸気取入口は、前記冷却空気通路壁の出口近傍に開口されることを特徴とする請求項１に記載のエンジン作業機の吸気装置。
［請求項３］
前記吸気取入口の冷却空気上流側に隣接する冷却空気通路壁部分に、エンジンの被冷却部に冷却空気流を指向させるように前記冷却ファンの径方向に沿って滑らかに湾曲させたガイド面を形成したことを特徴とする請求項１又は請求項２に記載のエンジン作業機の吸気装置。
［請求項４］
前記吸気導入通路は、前記吸気取入口に連通する上流側部分が、前記ファンカバーと一体に形成されることを特徴とする請求項１〜請求項３のいずれか１つに記載のエンジン作業機の吸気装置。
［請求項５］
前記吸気導入通路の上流側部分は、前記ファンカバーの外側に前記吸気取入口と該吸気取入口の上方に形成された吸気出口を囲んで突出する周壁と、該周壁に嵌合される蓋部材とで構成されることを特徴とする請求項４に記載のエンジン作業機の吸気装置。
［請求項６］
上流端部が前記吸気導入通路の上流側部分に接続され、下流端部が前記エアクリーナ吸入口に接続される吸気導入通路の下流側部分は、弾性部材で形成されていることを特徴とする請求項４又は請求項５に記載のエンジン作業機の吸気装置。
［請求項７］
前記吸気導入通路の下流側部分は、四角形状断面を有して形成されていることを特徴とする請求項６に記載のエンジン作業機の吸気装置。
［請求項８］
前記吸気導入通路の上流側部分と、下流側部分とは、エンジン本体に形成された中間ポートを介して接続されることを特徴とする請求項６又は請求項７に記載のエンジン作業機の吸気装置。
Other effects obtained in the first embodiment can be obtained in the second embodiment as well.
Further, the present invention can be applied to an engine working machine that generates dust by work, such as a hedge trimmer, a blower, or any engine working machine used in an environment with much dust in the outside air, in addition to a chain saw.
The claims originally filed were as follows.
[Claim 1]
An engine is provided in the main body case, and a cooling air passage is formed in the fan cover connected to the main body case for guiding the cooling air flow generated by the rotation of the cooling fan connected to the engine to the cooled portion of the engine. Engine working machine,
An intake air intake port for taking a part of the cooling air into the cooling air passage wall of the fan cover in a direction substantially orthogonal to the traveling direction of the cooling air flow is opened, and the intake air intake port is led to the air cleaner intake port of the engine intake system. An intake device for an engine working machine, wherein an intake air introduction passage is provided.
[Claim 2]
2. The intake device for an engine working machine according to claim 1, wherein the intake port is opened near an outlet of the cooling air passage wall.
[Claim 3]
A guide surface that is smoothly curved along the radial direction of the cooling fan so as to direct the cooling air flow toward the cooled portion of the engine on the cooling air passage wall portion adjacent to the cooling air upstream side of the intake air intake. The intake device for an engine working machine according to claim 1 or 2, wherein the intake device is formed.
[Claim 4]
The engine working machine according to any one of claims 1 to 3, wherein the intake air introduction passage is formed integrally with the fan cover at an upstream portion communicating with the intake air intake. Inhalation device.
[Claim 5]
The upstream side portion of the intake introduction passage includes a peripheral wall projecting around the intake inlet and the intake outlet formed above the intake inlet outside the fan cover, and a lid member fitted to the peripheral wall The intake device for an engine working machine according to claim 4, wherein
[Claim 6]
An upstream end portion is connected to an upstream portion of the intake air introduction passage, and a downstream portion of the intake air introduction passage whose downstream end portion is connected to the air cleaner suction port is formed of an elastic member. The intake device for an engine working machine according to claim 4 or 5.
[Claim 7]
The intake device for an engine working machine according to claim 6, wherein a downstream portion of the intake air introduction passage has a quadrangular cross section.
[Claim 8]
The intake portion of the engine working machine according to claim 6 or 7, wherein the upstream portion and the downstream portion of the intake introduction passage are connected via an intermediate port formed in the engine body. apparatus.
１…チェンソー、２…本体ケース、３…エンジン、４…ハンドル、５…冷却ファン、５ａ…フィン、６…ファンカバー、７…スタータケース、７ａ…突部、８…冷却空気通路、９…エアクリーナ、９ａ…吸入口、９ｂ…フィルタ、１０…吸気取入口、１１…吸気出口、１２…周壁、１３…ダクトカバー、１４…第１エアダクト、１７…第２エアダクト、３１…中間ポート DESCRIPTION OF SYMBOLS 1 ... Chain saw, 2 ... Main body case, 3 ... Engine, 4 ... Handle, 5 ... Cooling fan, 5a ... Fin, 6 ... Fan cover, 7 ... Starter case, 7a ... Projection, 8 ... Cooling air passage, 9 ... Air cleaner , 9a ... suction port, 9b ... filter, 10 ... intake intake, 11 ... intake outlet, 12 ... peripheral wall, 13 ... duct cover, 14 ... first air duct, 17 ... second air duct, 31 ... intermediate port
Claims (7)
前記ファンカバーの冷却空気通路壁に前記冷却空気流の進行方向と略直交する方向に冷却空気の一部を取り入れる吸気取入口を前記エンジンに相対するように開口し、前記吸気取入口からエンジン吸気系のエアクリーナ吸入口に導く吸気導入通路を配設し、
前記吸気取入口の冷却空気上流側に隣接する冷却空気通路壁部分に、前記エンジンの被冷却部に冷却空気流を指向させるように前記冷却ファンの径方向外側に向かうほど前記エンジンに近づくように滑らかに湾曲させたガイド面を形成したことを特徴とするエンジン作業機の吸気装置。 An engine to the main body case, wherein the concatenated fan cover to the main body case, the cooling air passage for guiding the cooling air flow generated by rotation of connected cold 却Fu § on to the engine in the cooled portion of the engine Formed engine working machine,
An intake air intake port for taking a part of the cooling air into the cooling air passage wall of the fan cover in a direction substantially orthogonal to the traveling direction of the cooling air flow is opened so as to face the engine, and the engine intake air from the intake air intake port. An air intake passage that leads to the air cleaner intake of the system ,
A cooling air passage wall adjacent to the intake air upstream side of the intake air inlet is directed closer to the engine as it goes radially outward of the cooling fan so as to direct the cooling air flow toward the cooled portion of the engine. An intake device for an engine working machine, characterized in that a smoothly curved guide surface is formed .
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| JP2013220966A JP6211388B2 (en) | 2013-10-24 | 2013-10-24 | Intake device for engine working machine |
| CN201420611496.1U CN204212882U (en) | 2013-10-24 | 2014-10-21 | The suction means of engine operated machine |
| DE201420008438 DE202014008438U1 (en) | 2013-10-24 | 2014-10-22 | Intake device of a motor work machine |
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| JP6660477B2 (en) * | 2016-09-21 | 2020-03-11 | 本田技研工業株式会社 | Cooling structure of internal combustion engine for saddle type vehicle |
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| JPS59107969U (en) * | 1983-01-13 | 1984-07-20 | 三菱重工業株式会社 | overhead valve gasoline engine |
| JP3587825B2 (en) * | 2002-06-03 | 2004-11-10 | 株式会社共立 | Portable power working machine |
| JP4581801B2 (en) * | 2005-04-04 | 2010-11-17 | トヨタ自動車株式会社 | Internal combustion engine |
| JP4533296B2 (en) * | 2005-10-19 | 2010-09-01 | 株式会社日工タナカエンジニアリング | Engine working machine |
| JP2009287461A (en) * | 2008-05-29 | 2009-12-10 | Toyoda Gosei Co Ltd | Intake device and intake method |
| JP5527065B2 (en) * | 2010-07-09 | 2014-06-18 | 日立工機株式会社 | Portable engine work machine |
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