WO2011074404A1 - 作業機用エンジン - Google Patents
作業機用エンジン Download PDFInfo
- Publication number
- WO2011074404A1 WO2011074404A1 PCT/JP2010/071403 JP2010071403W WO2011074404A1 WO 2011074404 A1 WO2011074404 A1 WO 2011074404A1 JP 2010071403 W JP2010071403 W JP 2010071403W WO 2011074404 A1 WO2011074404 A1 WO 2011074404A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fuel
- fuel tank
- secondary filter
- air
- chamber
- Prior art date
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Classifications
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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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0064—Layout or arrangement of systems for feeding fuel for engines being fed with multiple fuels or fuels having special properties, e.g. bio-fuels; varying the fuel composition
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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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/08—Plants characterised by the engines using gaseous fuel generated in the plant from solid fuel, e.g. wood
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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
- F02B43/00—Engines characterised by operating on gaseous fuels; Plants including such engines
- F02B43/10—Engines or plants characterised by use of other specific gases, e.g. acetylene, oxyhydrogen
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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
- F02M17/00—Carburettors having pertinent characteristics not provided for in, or of interest apart from, the apparatus of preceding main groups F02M1/00 - F02M15/00
- F02M17/02—Floatless carburettors
- F02M17/04—Floatless carburettors having fuel inlet valve controlled by diaphragm
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Definitions
- the present invention relates to an engine used in a working machine such as a brush cutter.
- biomass ethanol production technology has a short history, and substances that were not decomposed during the production process may remain in the biomass ethanol.
- biomass ethanol that uses cellulosic biomass which is waste biomass such as wood and waste paper, as a raw material for agricultural crops has attracted attention.
- a different treatment from that using saccharide-based or starch-based biomass as a raw material is required, for example, separation and removal of lignin is required as a pretreatment.
- An object of the present invention is to provide an engine for a working machine in which no particular problem occurs due to a specific substance remaining in biomass ethanol.
- the invention according to claim 1 is a combustion chamber for inhaling and exploding an air-fuel mixture, a piston that reciprocates by an explosion pressure generated in the combustion chamber, and a reciprocating motion of the piston linked to the piston.
- the at least secondary filter is configured to be able to remove substances remaining without being decomposed during the biomass ethanol production process.
- the secondary filter is formed so as to be able to remove celluloses remaining in biomass ethanol.
- the secondary filter is formed of a metal steel wire.
- the secondary filter is formed of a stainless steel wire.
- the vaporizer and the fuel tank are connected to each other, and one end is positioned in the fuel tank, and the other end is connected to the vaporizer outside the fuel tank.
- the secondary filter is provided in a portion of the suction passage that is located outside the fuel tank.
- FIG. 1 is a sectional view of a front side of a four-cycle engine used in a brush cutter
- FIG. 2 is a sectional view of a side surface side.
- the four-cycle engine 1 accommodates a piston 4 in a cylinder block 2 so as to be capable of reciprocating.
- a cylinder head 6 is integrally provided on one end side in the longitudinal direction of the cylinder block 2 (upward in the drawing), and a combustion chamber 8 is formed by the upper surface of the cylinder block 2, the cylinder head 6 and the piston 4.
- An oil pan 10 is fixed to the other end side (downward in the drawing) of the cylinder block 2 in the longitudinal direction, and the crankcase 12 is constituted by the cylinder block 2 and the oil pan 10.
- a crank chamber 14 is formed inside the crankcase 12, and a crankshaft 16 is rotatably supported so that both ends protrude from the crank chamber 14.
- the crankshaft 16 is connected to the piston 4 by a connecting rod 18, and the reciprocating motion of the piston 4 is converted into the rotational motion of the crankshaft 16 through the connecting rod 18.
- An oil reservoir chamber 20 is provided in the crankcase 12 for storing lubricating oil for lubricating each engine.
- the oil reservoir chamber 20 is partitioned from the crank chamber 14 by a partition wall 2a formed in the cylinder block 2 as shown in the figure, and is a sealed space. Thereby, in a portable working machine such as a brush cutter, the lubricating oil does not scatter from the oil reservoir chamber 20 even when the top and bottom is turned upside down or turned sideways during use.
- a communication path 22 is formed in the crankcase 12.
- One end of the communication passage 22 opens into the oil reservoir chamber 20 and the other end faces the periphery of the crankshaft 16 in the crank chamber 14.
- a pipe 24 having flexibility is connected to the opening on the oil reservoir chamber 20 side in the communication passage 22.
- a weight 26 is provided at the tip of the pipe 24, and even if the four-cycle engine 1 is tilted, the pipe 24 follows the displacement of the liquid level of the lubricating oil, so that the lubricating oil in the oil reservoir chamber 20 is surely secured. Can be inhaled.
- crankshaft 16 is formed with a lubricating oil passage 16a that communicates the communication passage 22 and the crank chamber 14 during the rotation thereof, and lubrication in the oil reservoir chamber 20 is caused by the negative pressure action generated in the crank chamber 14.
- Oil is guided to the crank chamber 14 through the pipe 24, the communication passage 22 and the lubricating oil passage 16a.
- the lubricating oil introduced into the crank chamber 14 is scattered mainly from the crank web or the like by the rotation of the crankshaft 16 and lubricates the piston 4 and various components in the crank chamber 14.
- a part of the lubricating oil scattered in the crank chamber 14 is misted and guided to a side chamber 50 or a valve operating chamber 52 described later via a passage (not shown), whereby the side chamber 50 or the valve operating chamber is Various components provided in 52 are also lubricated.
- the lubricating oil guided to the side chamber 50 and the valve operating chamber 52 is returned again into the crank chamber 14 from a return passage (not shown) by a negative pressure effect generated by the lifting and lowering action of the piston 4.
- the partition wall 2 a is provided with a one-way valve 28 that allows only the lubricating oil to flow from the crank chamber 14 to the oil reservoir chamber 20.
- the one-way valve 28 is opened by the pressurizing action in the crank chamber 14 and returns the lubricating oil lubricated with various components to the oil reservoir chamber 20.
- the cylinder head 6 includes an intake port 30 for guiding an air-fuel mixture generated in a carburetor 100 described later to the combustion chamber 8 and an exhaust gas for guiding exhaust gas generated in the combustion chamber 8 to the exhaust muffler 32.
- a port 34 is formed.
- the cylinder head 6 is provided with an intake valve 36 for opening and closing the intake port 30 with respect to the combustion chamber 8 and an exhaust valve 38 for opening and closing the combustion chamber 8 with respect to the exhaust port 34.
- the intake valve 36 and the exhaust valve 38 are opened and closed by a valve operating mechanism 40.
- the valve mechanism 40 is a so-called OHV type valve mechanism.
- the valve mechanism 40 has a crankshaft gear 42, a camshaft 44, rocker arms 46, 48, and the like as main components.
- the crankshaft gear 42 and the camshaft 44 are provided in a side chamber 50 formed along the cylinder block 2 and the crankcase 12, and the rocker arms 46 and 48 are formed further upward in the drawing than the cylinder head 6.
- the crankshaft gear 42 rotates integrally with the crankshaft 16 in the side chamber 50.
- the camshaft 44 is provided with a camshaft gear 44 a that meshes with the crankshaft gear 42 in the side chamber 50 and rotates the camshaft 44 by 1 ⁇ 2 rotation of the crankshaft 16. Further, the camshaft 44 is provided with a cam 44 b that rotates integrally with the camshaft 44.
- One end of the push rod 54 is in contact with the cam 44b, and the push rod 54 moves in the longitudinal direction by the rotation of the cam 44b.
- the other end of the push rod 54 is connected to the rocker arms 46 and 48 described above, and the rocker arms 46 and 48 swing as the push rod 54 moves. Then, the rocking of the rocker arms 46 and 48 pushes down the intake valve 36 and the exhaust valve 38, thereby opening and closing the intake port 30 and the exhaust port 34.
- the intake valve 36 opens in the intake process in which the piston 4 moves from the top dead center to the bottom dead center.
- the air-fuel mixture is sucked into the combustion chamber 8 from the intake port 30 by the action of the negative pressure generated as the volume increases in the combustion chamber 8.
- the vaporizer 100 generates the air-fuel mixture sucked into the combustion chamber 8.
- the carburetor 100 mixes the fuel guided from the fuel tank 56 with the air that has passed through the air cleaner to generate an air-fuel mixture.
- the vaporizer 100 is a diaphragm type so that it can be used in any direction. It is configured. Below, the structure of the vaporizer
- the vaporizer 100 includes a vaporizer body 102.
- the carburetor main body 102 is formed with a pulse passage 104 communicating with the crank chamber 14, and this pulse passage 104 faces one side (upper surface in the drawing) of the pump diaphragm 106.
- a pump chamber 108 is formed on the other side (the lower surface in the drawing) of the pump diaphragm 106.
- a fuel inlet 112 communicates with the pump chamber 108 via an inlet valve 110, and a diaphragm chamber 118 communicates with an outlet valve 114 and a needle valve 116.
- the fuel inlet 112 is connected to the fuel tank 56 via a suction pipe 200 and a suction pipe 62 described later (see FIG. 1).
- the diaphragm chamber 118 is separated from the back pressure chamber 122 by the metal ring diaphragm 120.
- a negative pressure of the engine acts on the back pressure chamber 122, and the metering diaphragm 120 is operated by a pressure difference between the negative pressure of the engine and the diaphragm chamber 118.
- the metering diaphragm 120 is connected to the needle valve 116 via a control lever 124, and the needle valve 116 is opened and closed by the operation of the metering diaphragm 120.
- the diaphragm chamber 118 is filled with fuel
- the diaphragm chamber 118 is pressurized and the metering diaphragm 120 is operated toward the back pressure chamber 122 side.
- control lever 124 rotates so that one end (left side in the figure) is pushed down and the other end (right side in the figure) is pushed up.
- the needle valve 116 is pushed up by such a turning operation of the control lever 124, and the communication between the pump chamber 108 and the diaphragm chamber 118 is blocked.
- the vaporizer body 102 is formed with a passage 128 that connects the intake port 30 formed in the cylinder head 6 and an air cleaner (not shown).
- the passage 128 has an upstream side (air cleaner side) as a large-diameter portion 128a and a downstream side (intake port 30 side) as a venturi portion 128b having a smaller diameter than the large-diameter portion 128a.
- a throttle valve 130 is provided for displacing the valve.
- the throttle valve 130 has a rotational axis orthogonal to the passage 128, and rotates while sliding in the vertical direction in the figure by operating the rotation lever 130a.
- the opening degree of the venturi portion 128b is displaced by the amount of rotation. .
- this throttle valve 130 is provided with an adjust task screw 132.
- the adjust screw 132 is screwed to the throttle valve 130 and extends the screw tip 132a to the vicinity of the center of the passage 128.
- the adjustment screw 132 is rotated in one direction (tightening direction) with respect to the throttle valve 130, the screw tip 132a of the adjustment screw 132 moves downward in the figure to increase the amount of protrusion to the venturi portion 128b.
- the adjustment screw 132 is rotated in the other direction (return direction) with respect to the throttle valve 130, the screw tip 132a of the adjustment screw 132 moves upward in the figure, and the protrusion amount to the venturi portion 128b is increased. Reduce.
- the vaporizer body 102 is provided with a nozzle 134 so as to face the adjustment task screw 132, and the screw tip 132 a of the adjustment task screw 132 is inserted into the nozzle tip 134 a of the nozzle 134. Further, a hole 134 b that opens to the passage 128 is formed in the nozzle 134, and a base end 134 c that communicates with the hole 134 b faces the diaphragm chamber 118. A main jet 136 and a main check valve 138 are provided between the hole 134b and the diaphragm chamber 118.
- the adjustment screw 132 when the adjustment screw 132 is rotated in the returning direction, the screw tip 132a is retracted from the venturi portion 128b, and the opening degree of the hole 134b is increased. Therefore, the amount of fuel sucked out from the hole 134b increases, and the air-fuel mixture can be enriched. In this way, by adjusting the adjustment task 132, the concentration of the air-fuel mixture in the idle state can be adjusted.
- the vaporizer body 102 is provided with a primer pump 140 that can be manually compressed and expanded, and generates a negative pressure in the diaphragm chamber 118 by the operation.
- the primer pump 140 When the primer pump 140 is operated, the diaphragm chamber 118 becomes negative pressure, so that fuel is sucked up from the fuel tank 56 into the diaphragm chamber 118.
- the main check valve 138 functions to prevent air from flowing from the passage 128 into the diaphragm chamber 118 via the nozzle 134. The sucked fuel is returned from the diaphragm chamber 118 to the fuel tank 56 through the overflow pipe 142.
- the vaporizer 100 and the fuel tank 56 are connected by a suction pipe 200 and a return pipe 202.
- the fuel tank 56 has a substantially U-shaped cross section and is disposed so as to cover the crankcase 12.
- a cap fitting hole 58 is formed in a portion facing the vaporizer 100, and the cap 60 is fitted in the cap fitting hole 58.
- the cap 60 is inserted through the return pipe 202 in a press-fitted state.
- One end of the return pipe 202 is press-fitted and fixed to the overflow pipe 142 of the vaporizer 100, and the other end is positioned in the fuel tank 56.
- the fuel sucked into the diaphragm chamber 118 by the operation of the primer pump 140 is returned to the fuel tank 56 through the overflow pipe 142 and the return pipe 202.
- the cap 60 is penetrated with the suction pipe 62 being press-fitted and fixed.
- the suction pipe 62 has flexibility, one end 62 a is connected to the suction pipe 200 via a connecting member 204 described later, and the other end 62 b is located in the fuel tank 56. ing.
- the suction pipe 62 is longer than the return pipe 202, and can enter the fuel tank 56.
- a primary filter 64 for removing impurities in the fuel is provided at the end 62b of the suction pipe 62 so that the impurities do not enter the suction pipe 62 when the fuel is guided to the vaporizer 100. I have to.
- a weight 66 is provided around the primary filter 64 so that the suction pipe 62 follows the displacement of the fuel level even if the four-cycle engine 1 is tilted. As a result, the fuel in the fuel tank 56 is reliably sucked even when the four-cycle engine 1 is tilted in any direction.
- the suction pipe 62 and the suction pipe 200 are connected via a connection member 204 as shown in FIG.
- the connecting member 204 includes a hollow cylinder 204a and a lid 204b that is fixed to the cylinder 204a by screwing.
- the suction pipe 200 is fixed to the cylindrical body 204a by press-fitting, an adhesive, or the like.
- the end portion 62a of the suction pipe 62 is fixed to the lid body 204b.
- a through hole is formed in the lid 204b, and the suction pipe 62 and the suction pipe 200 communicate with each other by screwing the lid 204b to the cylinder 204a.
- a secondary filter 206 and a spring 208 for pressing the secondary filter 206 from the lid 204b side to the cylinder body 204a are provided in the cylinder body 204a.
- the area of the side surface of the secondary filter 206 is larger than the opening area of the suction pipe 200, and the secondary filter 206 is pressed against the entire opening of the suction pipe 200 by the elastic force of the spring 208, so that the fuel to be sucked in is reliably Pass through the secondary filter 206.
- the secondary filter 206 is intended to remove substances (for example, celluloses, hereinafter referred to as “non-decomposed substances”) that remain without being decomposed during the production process of biomass ethanol. That is, in the process in which the fuel is guided from the fuel tank 56 to the vaporizer 100, first, impurities such as dust mixed in the fuel are removed by the primary filter 64. The fuel from which impurities have been removed by the primary filter 64 will further pass through the secondary filter 206, but in the process of passing the fuel through the secondary filter 206, the non-decomposition contained in the fuel (biomass ethanol). Material is removed.
- substances for example, celluloses, hereinafter referred to as “non-decomposed substances”
- the secondary filter 206 a metal fiber having a property in which fine filter holes are formed and the fibrous body is three-dimensionally entangled in the fuel flow direction is used. In view of the above, it is more desirable to use stainless steel fibers.
- the flow of fuel to the vaporizer 100 is immediately obstructed, or the filter
- the impurities can be surely removed without inconvenience such as frequent replacement or cleaning. That is, non-degradable substances such as celluloses that could not be removed by the primary filter 64 can be removed by the secondary filter 206.
- the carburetor 100 it is necessary to design the diameters of the main jet 136 and the nozzle 134 in detail in order to realize the theoretical air-fuel consumption. However, if non-decomposing substances such as celluloses continue to adhere to these parts, the diameter becomes small. It becomes impossible to realize the theoretical air fuel consumption.
- the secondary filter 206 By providing the secondary filter 206 on the upstream side of the portion affected by the adhesion of impurities as in the present embodiment, it is possible to prevent such a special problem from occurring.
- the primary filter 64 may be made of the same material as that of the secondary filter 206, and non-decomposed substances may be removed also in the primary filter 64. However, if the primary filter 64 tries to remove non-decomposed substances such as cellulose and other substances together, the primary filter 64 may be easily clogged. Therefore, the filtering hole of the primary filter 64 is made coarser than the filtering hole of the secondary filter 206, and impurities larger than the non-decomposed substance are mainly removed by the primary filter 64. More preferably, it is removed by the next filter 206.
- the secondary filter 206 since the secondary filter 206 has finer filtration holes than the primary filter 64, the frequency of replacement and cleaning may increase. Therefore, according to the present embodiment, in consideration of the replacement frequency of the secondary filter 206 and the frequency of cleaning, the distribution process between the fuel tank 56 and the vaporizer 100, more specifically, outside the fuel tank 56. Moreover, a secondary filter 206 is provided on the outside of the vaporizer main body 102 so as to be easily attached and detached. That is, the arrangement and stage of the secondary filter 206 are not particularly limited as long as the secondary filter 206 is downstream of the primary filter 64 and can filter the fuel before the air-fuel mixture is generated. Therefore, the secondary filter 206 may be provided in the fuel tank 56 or in the vaporizer 100.
- the secondary filter 206 that may be frequently replaced or cleaned as described above is provided in other parts such as the vaporizer body 102 or the fuel tank 56, the replacement or cleaning work is performed. Becomes complicated. If the secondary filter 206 is provided outside the fuel tank 56 and outside the vaporizer body 102 as in the present embodiment, the replacement work and the cleaning work are facilitated. Such complications can be eliminated.
- the present invention in the present embodiment, the case where the present invention is applied to a four-cycle engine has been described. However, the present invention can also be applied to a two-cycle engine.
- working machines to which the present invention is applicable include all machines that are connected to the crankshaft 16 and are operated by the rotational power of the crankshaft 16.
- the shape and arrangement of the fuel tank 56, the carburetor 100, or the components such as the combustion system and the drive system such as the piston 4 and the crankshaft 16 in the present embodiment are merely examples, and are limited to the configuration of the present embodiment. Is not to be done.
- this embodiment brings about an especially advantageous effect when biomass ethanol is used as a fuel, and does not prevent the use of other fuels such as gasoline.
- the effect of this embodiment is not limited by the raw material of biomass ethanol.
- the secondary filter 206 was comprised with the metal steel wire, the thing which remains without being decomposed
- the relationship between the primary filter 64 and the secondary filter 206 has been particularly described.
- the number of filters is not limited to two, and three or more filters may be provided. In any case, in the case where filters are provided in multiple stages, it is sufficient that the non-decomposing substance can be removed by at least one or more filters after the second from the upstream side.
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Abstract
Description
また、近年では、環境問題や食糧問題の観点から、農作物の非食部分や、木材、古紙等の廃棄物系バイオマスであるセルロース系バイオマスを原料とするバイオマスエタノールが注目されている。こうしたセルロース系バイオマスを原料とするバイオマスエタノールの生成においては、前処理としてリグニンの分離除去が必要となる等、糖質系あるいはデンプン系バイオマスを原料とする場合と異なる処理が要求される。そのため、セルロース系バイオマスを原料とするバイオマスエタノールの生成には技術的課題もまだまだ多い。したがって、現在の生成技術により、セルロース系バイオマスを原料として生成されるバイオマスエタノール中には、その生成過程で分解されなかった物質、特にはセルロース類が見受けられる。
請求項3に記載の発明は、前記2次フィルタが、金属鋼線によって形成されている。
請求項4に記載の発明は、前記2次フィルタが、ステンレス鋼線によって形成されている。
請求項5に記載の発明は、前記気化器と前記フューエルタンクとを接続するとともに、一端を前記フューエルタンク内に位置させ他端を前記フューエルタンクの外方において前記気化器に接続される吸入通路を備え、前記2次フィルタは、前記吸入通路において前記フューエルタンクの外方に位置する部分に設けられている。
図1および図2に示すように、4サイクルエンジン1は、シリンダブロック2にピストン4を往復動自在に収容している。このシリンダブロック2の長手方向の一端側(図中上方)にはシリンダヘッド6が一体的に設けられており、これらシリンダブロック2、シリンダヘッド6およびピストン4の上面によって燃焼室8が形成される。
シリンダブロック2の長手方向の他端側(図中下方)には、オイルパン10が固定されており、シリンダブロック2とオイルパン10とによってクランクケース12が構成されている。
なお、クランクケース12の内部には、各機関を潤滑するための潤滑油を貯留するための油溜室20が設けられている。この油溜室20は、図示のようにシリンダブロック2に形成された仕切壁2aによってクランク室14から仕切られ、密閉された空間となっている。これにより、刈払機のような携帯式の作業機において、使用の際に天地が逆になったり横向きになったりしても、油溜室20から潤滑油が飛散しない。
すでに説明したように、使用中に天地が逆になったり横向きになったりするおそれがあることを考慮し、本実施形態においては、いずれの方向でも使用できるように、気化器100をダイヤフラム式の構成としている。以下に、図3を用いて気化器100の構成について説明する。
さらに、ノズル134には、通路128に開口する孔134bが形成されており、この孔134bに連通する基端134cを、ダイヤフラム室118に臨ませている。なお、孔134bとダイヤフラム室118との間には、メインジェット136およびメインチェックバルブ138が設けられている。
より具体的には、フューエルタンク56は、断面を略コ字形に形成されており、クランクケース12を覆うように配置されている。フューエルタンク56において、気化器100と対面する部分にはキャップ嵌め込み孔58が形成されており、このキャップ嵌め込み孔58にキャップ60が嵌め込まれている。キャップ60は、戻り管202を圧入固定した状態で貫通させている。戻り管202は、一端を気化器100のオーバーフローパイプ142に圧入固定され、他端をフューエルタンク56内に位置させている。これにより、プライマポンプ140の操作によってダイヤフラム室118に吸い上げられた燃料は、オーバーフローパイプ142および戻り管202を介してフューエルタンク56に戻される。
また、筒体204a内には、2次フィルタ206と、この2次フィルタ206を蓋体204b側から筒体204a側に押し付けるためのスプリング208とが設けられている。2次フィルタ206の側面の面積は、吸入管200の開口面積よりも大きく、スプリング208の弾性力によって2次フィルタ206が吸入管200の開口部全面に押し付けられることにより、吸入される燃料が確実に2次フィルタ206を通過する。
すなわち、1次フィルタ64によって除去することができなかったセルロース類等の非分解物質を、2次フィルタ206によって除去することができる。
気化器100においては、理論空燃費を実現するために、メインジェット136やノズル134の径を詳細に設計する必要があるが、こうした部位にセルロース類等の非分解物質が付着し続けると径が小さくなってしまい、理論空燃費を実現できなくなってしまう。本実施形態のように、不純物の付着によって影響が及ぼされる部位よりも上流側に2次フィルタ206を設けることにより、こうした特段の問題が生じるのを防ぐことが可能となる。
しかしながら、上記のように交換や洗浄の頻度が高くなるおそれがある2次フィルタ206を、気化器本体102やフューエルタンク56等、他の部品の内部に設けてしまうと、その交換作業や洗浄作業が煩雑になってしまう。本実施形態のように、フューエルタンク56の外方であって、しかも、気化器本体102の外方に着脱容易に2次フィルタ206を設ければ、交換作業や洗浄作業が容易となり、上記のような煩雑さを解消することができる。
また、本発明を適用可能な作業機は、クランクシャフト16に接続されて、クランクシャフト16の回転動力によって作動するもの全てが含まれる。
また、本実施形態におけるフューエルタンク56や気化器100、あるいはピストン4やクランクシャフト16といった燃焼系や駆動系等の各構成部品の形状や配置等は一例に過ぎず、本実施形態の構成に限定されるものではない。
また、本実施形態は、バイオマスエタノールを燃料として用いた場合に特に有利な作用効果をもたらすものであって、ガソリン等の他の燃料を用いることを妨げるものではない。また、本実施形態の作用効果は、バイオマスエタノールの原料によって限定されることはない。
また、本実施形態においては、2次フィルタ206を金属鋼線によって構成したが、濾過孔の大きさ等、バイオエタノールの生成過程で分解されずに残留してしまう物質を除去することができるものであれば、その材質や形状等は特に限定されない。
また、本実施形態においては、特に1次フィルタ64と2次フィルタ206との関係について説明したが、フィルタは2つに限らず、3つ以上設けることとしても構わない。いずれにしても、多段階にフィルタを設けた場合には、非分解物質を、少なくとも上流側から2つ目以降の1つまたは2以上のフィルタによって除去することができればよい。
8 燃焼室
16 クランクシャフト
56 フューエルタンク
64 1次フィルタ
100 気化器
206 2次フィルタ
Claims (5)
- 混合気を吸入して爆発させるための燃焼室と、
前記燃焼室で発生する爆発圧力によって往復動するピストンと、
前記ピストンに連係され、前記ピストンの往復運動を回転運動に変換して出力するためのクランクシャフトと、
バイオマスエタノールが含まれる燃料を貯留するためのフューエルタンクと、
前記フューエルタンクから導かれた燃料を空気に混合して前記混合気を生成するための気化器と、
前記フューエルタンクから前記混合気が生成されるまでの燃料の流通過程に設けられ、燃料中に混入する不純物を段階的に除去するための1次フィルタおよび2次フィルタと、を備え、
少なくとも前記2次フィルタは、前記バイオマスエタノールの生成過程で分解されずに残留した物質を除去可能である作業機用エンジン。 - 前記2次フィルタは、バイオマスエタノールに残留するセルロース類を除去可能に形成された請求項1記載の作業機用エンジン。
- 前記2次フィルタは、金属鋼線によって形成された請求項2記載の作業機用エンジン。
- 前記2次フィルタは、ステンレス鋼線によって形成された請求項3記載の作業機用エンジン。
- 前記気化器と前記フューエルタンクとを接続するとともに、一端を前記フューエルタンク内に位置させ他端を前記フューエルタンクの外方において前記気化器に接続される吸入通路を備え、
前記2次フィルタは、前記吸入通路において前記フューエルタンクの外方に位置する部分に設けられた請求項1~4のいずれかに記載の作業機用エンジン。
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EP3584435A1 (de) * | 2018-06-19 | 2019-12-25 | Andreas Stihl AG & Co. KG | Vergaser und handgeführtes arbeitsgerät mit einem verbrennungsmotor mit einem vergaser |
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JP2004261696A (ja) * | 2003-02-28 | 2004-09-24 | Toshiba Corp | 排熱利用木質系バイオマス液化システムおよびエタノールの製造方法 |
JP2007255196A (ja) * | 2006-03-20 | 2007-10-04 | Mitsubishi Electric Corp | 燃料供給装置 |
JP2008248753A (ja) * | 2007-03-29 | 2008-10-16 | Honda Motor Co Ltd | 車両の燃料供給装置 |
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JP2004261696A (ja) * | 2003-02-28 | 2004-09-24 | Toshiba Corp | 排熱利用木質系バイオマス液化システムおよびエタノールの製造方法 |
JP2007255196A (ja) * | 2006-03-20 | 2007-10-04 | Mitsubishi Electric Corp | 燃料供給装置 |
JP2008248753A (ja) * | 2007-03-29 | 2008-10-16 | Honda Motor Co Ltd | 車両の燃料供給装置 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3584435A1 (de) * | 2018-06-19 | 2019-12-25 | Andreas Stihl AG & Co. KG | Vergaser und handgeführtes arbeitsgerät mit einem verbrennungsmotor mit einem vergaser |
CN110617161A (zh) * | 2018-06-19 | 2019-12-27 | 安德烈·斯蒂尔股份两合公司 | 汽化器和带有一具有汽化器的内燃机的手持式工作设备 |
US10801444B2 (en) | 2018-06-19 | 2020-10-13 | Andreas Stihl AG & Co. LG | Carburetor and handheld work apparatus including a combustion engine having said carburetor |
CN110617161B (zh) * | 2018-06-19 | 2022-10-04 | 安德烈·斯蒂尔股份两合公司 | 汽化器和带有一具有汽化器的内燃机的手持式工作设备 |
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JP2011127464A (ja) | 2011-06-30 |
BR112012011754A2 (pt) | 2016-03-01 |
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