JP2005344574A - Fuel tank support structure in forced air cooling engine - Google Patents

Fuel tank support structure in forced air cooling engine Download PDF

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Publication number
JP2005344574A
JP2005344574A JP2004163723A JP2004163723A JP2005344574A JP 2005344574 A JP2005344574 A JP 2005344574A JP 2004163723 A JP2004163723 A JP 2004163723A JP 2004163723 A JP2004163723 A JP 2004163723A JP 2005344574 A JP2005344574 A JP 2005344574A
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shroud
fuel tank
engine
forced air
crankcase
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JP4466998B2 (en
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Sohei Honda
宗平 本田
Keita Ito
慶太 伊藤
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To damp vibration transmission from an engine main body to a fuel tank and prevent noise generation from the fuel tank, in a fuel tank support structure in a forced air cooling engine. <P>SOLUTION: The fuel tank T is arranged above a crankcase 2 of the engine main body 1, and a cooling fan 9 is provided in one end of a crankshaft 6 supported by the crankcase 2. A shroud 12 for guiding cooling air generated by the cooling fan 9 to a cylinder part 3 is fixed to the engine main body 1. The shroud 12 is made of synthetic resin, and a plurality of tank stays 33 supporting the fuel tank T are formed integrally with the shroud 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は，クランクケースと，このクランクケースから一側方に突出したシリンダ部とを備えたエンジン本体の上方に燃料タンクを配設し，クランクケースに支承されたクランク軸の一端に冷却ファンを付設し，この冷却ファンにより生起された冷却風をシリンダ部へ誘導するシュラウドをエンジン本体に取り付けた強制空冷エンジンにおける燃料タンク支持構造に関する。   In the present invention, a fuel tank is disposed above an engine body having a crankcase and a cylinder portion protruding from the crankcase to one side, and a cooling fan is provided at one end of a crankshaft supported by the crankcase. The present invention also relates to a fuel tank support structure in a forced air-cooled engine in which a shroud for guiding cooling air generated by the cooling fan to a cylinder portion is attached to an engine body.

かゝる強制空冷エンジンは，例えば下記特許文献１に開示されるように知られている。
実用新案登録第２５１０８１１号公報 Such a forced air cooling engine is known, for example, as disclosed in Patent Document 1 below.
Utility Model Registration No. 2510811

従来の強制空冷エンジンでは，エンジン本体にボルト結合される鋼板製のタンクステーに燃料タンクをボルト結合する燃料タンク支持構造が広く採用されている。   In a conventional forced air-cooled engine, a fuel tank support structure in which a fuel tank is bolted to a steel plate tank stay bolted to the engine body is widely used.

こうした燃料タンク支持構造では，鋼板製タンクブラケットの防振性が低いため，エンジンの振動が燃料タンクに伝達し易く，燃料タンクの広い表面から放射音が発生し，商品性を損なう虞がある。   In such a fuel tank support structure, the vibration proofing of the steel tank bracket is low, so that the vibration of the engine is easily transmitted to the fuel tank, and there is a possibility that radiated sound is generated from the wide surface of the fuel tank and the merchantability is impaired.

本発明は，かゝる事情に鑑みてなされたもので，エンジン本体から燃料タンクへの振動伝達を効果的に減衰させて，燃料タンクからの騒音の発生を防ぐことができ，しかも構造が簡単な，強制空冷エンジンにおける燃料タンク支持構造を提供することを目的とする。   The present invention has been made in view of such circumstances, and can effectively attenuate vibration transmission from the engine body to the fuel tank to prevent noise from the fuel tank, and has a simple structure. Another object of the present invention is to provide a fuel tank support structure for a forced air cooling engine.

上記目的を達成するために，本発明は，クランクケースと，このクランクケースから一側方に突出したシリンダ部とを備えたエンジン本体の上方に燃料タンクを配設し，クランクケースに支承されたクランク軸の一端に冷却ファンを付設し，この冷却ファンにより生起された冷却風をシリンダ部へ誘導するシュラウドをエンジン本体に固着した強制空冷エンジンにおいて，前記シュラウドを合成樹脂製とすると共に，このシュラウドに，燃料タンクを支持する複数のタンクステーを一体に成形したことを第１の特徴とする。   In order to achieve the above object, the present invention provides a fuel tank disposed above a main body of an engine having a crankcase and a cylinder projecting sideways from the crankcase, and is supported by the crankcase. In a forced air cooling engine in which a cooling fan is attached to one end of the crankshaft and a shroud for guiding cooling air generated by the cooling fan to the cylinder portion is fixed to the engine body, the shroud is made of synthetic resin, and the shroud Further, the first feature is that a plurality of tank stays for supporting the fuel tank are integrally formed.

尚，前記シュラウドは，後述する本発明の実施例中の外側シュラウド１２に対応する。   The shroud corresponds to the outer shroud 12 in the embodiment of the present invention described later.

また本発明は，第１の特徴に加えて，前記シュラウドを，エンジン本体の，燃料タンクに対向する上面を覆うように形成し，その上面を覆う部分に前記タンクステーを一体に形成したことを第２の特徴とする。   According to the present invention, in addition to the first feature, the shroud is formed so as to cover an upper surface of the engine body facing the fuel tank, and the tank stay is integrally formed in a portion covering the upper surface. The second feature.

本発明の第１の特徴によれば，燃料タンクは，エンジン本体に固着される合成樹脂製のシュラウドに一体成形された複数のタンクステーに支持されるので，合成樹脂製のシュラウド及びタンクステーが制振機能を発揮して，エンジンの振動を吸収し，燃料タンクへの振動伝達を抑えることができる。したがって，燃料タンクの振動を効果的に防ぐことができ，しかも燃料タンクを支持する専用の支持部材をエンジン本体に設ける必要がないから，その支持構造の簡素化を図ることができる。   According to the first aspect of the present invention, the fuel tank is supported by a plurality of tank stays integrally formed with a synthetic resin shroud fixed to the engine body, so that the synthetic resin shroud and the tank stay are The vibration control function can be demonstrated to absorb engine vibration and suppress vibration transmission to the fuel tank. Therefore, the vibration of the fuel tank can be effectively prevented, and it is not necessary to provide a dedicated support member for supporting the fuel tank in the engine body, so that the support structure can be simplified.

また本発明の第２の特徴によれば，シュラウドは，エンジン本体からの放射熱を遮断する遮熱板の役割をも果たして，燃料タンクの加熱を防ぐことができ，しかもタンクステーの長さを最短に形成することができて，燃料タンクを強固に支持することができる。   Further, according to the second feature of the present invention, the shroud can also serve as a heat shield to block radiant heat from the engine body, thereby preventing the fuel tank from being heated, and further reducing the length of the tank stay. It can be formed in the shortest distance and can firmly support the fuel tank.

本発明の実施の形態を，添付図面に示す本発明の好適な実施例に基づいて説明する。   Embodiments of the present invention will be described based on preferred embodiments of the present invention shown in the accompanying drawings.

図１は本発明に係る強制空冷エンジンの正面図，図２は同エンジンの平面図，図３は同エンジンの側面図，図４は図１の４−４線断面図，図５は同エンジンの外側シュラウドの分解状態正面図，図６は外側シュラウドの組立状態平面図，図７は同エンジンを，外側シュラウドの取り外し状態で示す，図１との対応図，図８は同エンジンを，燃料タンク，エアクリーナ及び排気マフラの取り外し状態で示す，図２との対応図，図９は図７の９−９線断面図，図１０は図７の１０−１０線断面図，図１１は図７の１１−１１線断面図である。   1 is a front view of a forced air cooling engine according to the present invention, FIG. 2 is a plan view of the engine, FIG. 3 is a side view of the engine, FIG. 4 is a sectional view taken along line 4-4 of FIG. 6 is a front view of the outer shroud in an exploded state, FIG. 6 is a plan view of the outer shroud in an assembled state, FIG. 7 is a view corresponding to FIG. 1 showing the engine in a state where the outer shroud is removed, and FIG. FIG. 9 is a view corresponding to FIG. 2 with the tank, air cleaner and exhaust muffler removed, FIG. 9 is a sectional view taken along line 9-9 of FIG. 7, FIG. 10 is a sectional view taken along line 10-10 of FIG. FIG. 11 is a sectional view taken along line 11-11.

図１〜図３において，図示例の強制空冷エンジンＥは，単気筒汎用エンジンである。そのエンジン本体１は，下面に据え付けフランジ２ａを有してクランク軸４を水平に支承するクランクケース２と，このクランクケース２の一側から斜め上向きに突出するシリンダ部３とからなっており，シリンダ部３の外周面には多数の放熱フィン３ａ，３ａ…が突設されている。クランクケース２の上方には燃料タンクＴが，またシリンダ部３の上方にはエアクリーナＡ及びカバー付き排気マフラＭがそれぞれ配設される。シリンダ部３の側面には，そこに開口する吸気ポートに連通する気化器４が取り付けられ，この気化器４に吸気ダクト５を介して前記エアクリーナＡが接続される。またシリンダ部３の上面には，そこに開口する排気ポートに連通する前記排気マフラＭが取り付けられる。このように，エンジン本体１の上方に燃料タンクＴ，エアクリーナＡ及び排気マフラＭを集中的に水平配置することにより，シリンダ部３の側方への突出物を少なくして，エンジンＥのコンパクト化を図ることができる。   1 to 3, the forced air cooling engine E in the illustrated example is a single cylinder general purpose engine. The engine body 1 includes a crankcase 2 having a mounting flange 2a on the lower surface and supporting the crankshaft 4 horizontally, and a cylinder portion 3 protruding obliquely upward from one side of the crankcase 2. A large number of radiating fins 3 a, 3 a... Protrude from the outer peripheral surface of the cylinder portion 3. A fuel tank T is disposed above the crankcase 2, and an air cleaner A and an exhaust muffler M with a cover are disposed above the cylinder portion 3. A carburetor 4 communicating with an intake port opened there is attached to a side surface of the cylinder portion 3, and the air cleaner A is connected to the carburetor 4 via an intake duct 5. Further, the exhaust muffler M communicating with the exhaust port opened there is attached to the upper surface of the cylinder portion 3. As described above, the fuel tank T, the air cleaner A, and the exhaust muffler M are intensively arranged horizontally above the engine body 1 to reduce the protrusions to the side of the cylinder portion 3 and to make the engine E compact. Can be achieved.

図４に示すように，前記クランクケース２に支承されるクランク軸６の一端部にはフライホイール７がボルト８により固着され，このフライホイール７の外端面に遠心式の冷却ファン９が付設される。そして，この冷却ファン９により生起された冷却風をシリンダ部３等に誘導するシュラウド１０がエンジン本体１に取り付けられる。   As shown in FIG. 4, a flywheel 7 is fixed to one end portion of the crankshaft 6 supported by the crankcase 2 with bolts 8, and a centrifugal cooling fan 9 is attached to the outer end surface of the flywheel 7. The A shroud 10 that guides the cooling air generated by the cooling fan 9 to the cylinder portion 3 or the like is attached to the engine body 1.

このシュラウド１０について，図４〜図１１により説明する。   The shroud 10 will be described with reference to FIGS.

先ず図４〜図７において，シュラウド１０は，冷却ファン９を囲繞する鋼板製の内側シュラウド１１と，この内側シュラウド１１を収容すると共に，エンジン本体１の各部を覆う合成樹脂製の外側シュラウド１２とから構成される。   4 to 7, a shroud 10 includes a steel plate inner shroud 11 surrounding the cooling fan 9, and a synthetic resin outer shroud 12 that accommodates the inner shroud 11 and covers each part of the engine body 1. Consists of

内側シュラウド１１は，図４及び図７に示すように，遠心型冷却ファン９による吸入空気の昇圧を効率良く行い得るよう，スクロール型に形成されており，その外端壁には，冷却ファン９の吸入面が臨む円形の吸入口１１ａが，またその周壁には，シリンダ部３側に向かって開口する吐出口１１ｂがそれぞれ開口している。またこの内側シュラウド１１の，エンジン本体１に対向する内側端に取り付けフランジ１１ｃが形成されており，これが複数本のボルト１３，１３…によりエンジン本体１に固着される。こうして内側シュラウド１１はエンジン本体１に支持される。   As shown in FIGS. 4 and 7, the inner shroud 11 is formed in a scroll type so that the suction air can be efficiently boosted by the centrifugal cooling fan 9, and the cooling fan 9 is provided on the outer end wall thereof. A circular suction port 11a facing the suction surface and a discharge port 11b opening toward the cylinder part 3 are opened on the peripheral wall. Further, a mounting flange 11c is formed at the inner end of the inner shroud 11 facing the engine body 1, and this is fixed to the engine body 1 by a plurality of bolts 13, 13,. Thus, the inner shroud 11 is supported by the engine body 1.

外側シュラウド１２は，図４に示すように内側シュラウド１１を収容し，また図５〜図１０に示すようにエンジン本体１の，冷却ファン９側の側面を覆うシュラウド側部１４と，エンジン本体１の，燃料タンクＴ，エアクリーナＡ及び排気マフラＭに対向する上面を覆うと共に，シリンダ部３の冷却ファン９と反対側の側面の上半部を覆うシュラウド上部１５と，シリンダ部３の下面及び，シリンダ部３の冷却ファン９と反対側の側面の下半部を覆うシュラウド下部１６とに分割され，それぞれ合成樹脂により個別に成形される。   The outer shroud 12 houses the inner shroud 11 as shown in FIG. 4, and the shroud side portion 14 covering the side surface of the engine main body 1 on the cooling fan 9 side as shown in FIGS. A shroud upper portion 15 that covers an upper surface facing the fuel tank T, an air cleaner A, and an exhaust muffler M, and covers an upper half portion of the side surface of the cylinder portion 3 opposite to the cooling fan 9, a lower surface of the cylinder portion 3, and The cylinder portion 3 is divided into a shroud lower portion 16 that covers the lower half portion of the side surface opposite to the cooling fan 9 and is individually molded with a synthetic resin.

再び図４において，シュラウド側部１４の側面には，前記吸入口１１ａと並ぶ開口１４ａが設けられ，この開口１４ａを覆う，多数の通気孔１７ａ，１７ａ…を有するカップ状の吸気ルーバ１７がシュラウド側部１４の外側面に重ねて取り付けられる。吸気ルーバ１７は，シュラウド側部１４に重ねられる取り付けフランジ１７ｂを備えており，一方，内側シュラウド１１の内面には吸入口１１ａを囲む複数のウェルディングナット１９，１９…が設けられており，これらに螺合緊締する複数本のボルト２０，２０…により，前記取り付けフランジ１７ｂ及びシュラウド側部１４が内側シュラウド１１に固着される。したがって外側シュラウド１２及び吸気ルーバ１７は，高剛性の鋼板製内側シュラウド１１を介してエンジン本体１に強固に支持されることになる。   4, the side surface of the shroud side portion 14 is provided with an opening 14a aligned with the suction port 11a, and a cup-shaped intake louver 17 having a number of vent holes 17a, 17a,. It is attached to the outer surface of the side portion 14 so as to overlap. The intake louver 17 is provided with a mounting flange 17b that is overlapped with the shroud side portion 14. On the other hand, a plurality of welding nuts 19, 19,... Surrounding the intake port 11a are provided on the inner surface of the inner shroud 11. The mounting flange 17b and the shroud side portion 14 are fixed to the inner shroud 11 by a plurality of bolts 20, 20. Therefore, the outer shroud 12 and the intake louver 17 are firmly supported by the engine body 1 via the highly rigid steel plate inner shroud 11.

吸気ルーバ１７の内端壁の中心部には支軸２１が固設されており，この支軸２１に，スタータロープ２２を巻き込んだスタータプーリ２３を含む公知のリコイル式エンジンスタータ２４が取り付けられる。符号２２ａは，スタータロープ２２の外端に接続された，その牽引操作時に握るノブである。スタータプーリ２３には，吸気ルーバ１７を通過した空気の流れを許容する多数の透孔２３ａが設けられている。   A support shaft 21 is fixed at the center of the inner end wall of the intake louver 17, and a known recoil-type engine starter 24 including a starter pulley 23 around which a starter rope 22 is wound is attached to the support shaft 21. Reference numeral 22 a is a knob connected to the outer end of the starter rope 22 and gripped during the towing operation. The starter pulley 23 is provided with a number of through holes 23 a that allow the air flow that has passed through the intake louver 17.

図７及び図１０に示すように，シリンダ部３の周囲では，シュラウド上部１５，シュラウド上部１５及びシュラウド下部１６の三者により導風ダクト部２５（図１０参照）が構成され，内側シュラウド１１の吐出口１１ｂからの冷却風をシリンダ部３の周囲に誘導するようになっている。シュラウド上部１５には，導風ダクト部２５内を排気マフラＭに向けて開放する排風口２６が設けられる。シリンダ部３のヘッドカバー３ｂは上記導風ダクト部２５外に露出させてあり（図１参照），図６中の符号２７は，そのヘッドカバー３ｂを露出させる外側シュラウド１２の開口部を示す。   As shown in FIGS. 7 and 10, around the cylinder portion 3, an air guide duct portion 25 (see FIG. 10) is constituted by the shroud upper portion 15, the shroud upper portion 15 and the shroud lower portion 16, and the inner shroud 11. Cooling air from the discharge port 11 b is guided around the cylinder portion 3. The shroud upper portion 15 is provided with an exhaust port 26 that opens the air guide duct portion 25 toward the exhaust muffler M. The head cover 3b of the cylinder portion 3 is exposed to the outside of the air guide duct portion 25 (see FIG. 1), and reference numeral 27 in FIG. 6 indicates an opening portion of the outer shroud 12 that exposes the head cover 3b.

図１０に示すように，シュラウド上部１５及びシュラウド下部１６には，シリンダ部３に対向する部分に取り付けボス１５ａ，１６ａが設けられており，これらはシリンダ部３の外側面から冷却フィン３ａ，３ａ…より長く突出した支持ボス３０，３０にボルト３１，３１で固着される。また図７及び図１１に示すように，シュラウド上部１５にはクランクケース２に対向する部分に複数の取り付けボス１５ｂ，１５ｂ…が形成されており，これらはクランクケース２の上面に形成された複数の支持ボス４０，４０…にボルト３２，３２…により固着される。こうしてシュラウド上部１５及びシュラウド下部１６はエンジン本体１に支持される。   As shown in FIG. 10, the shroud upper portion 15 and the shroud lower portion 16 are provided with mounting bosses 15 a and 16 a at portions facing the cylinder portion 3, and these are provided on the cooling fins 3 a and 3 a from the outer surface of the cylinder portion 3. ... Are fixed to the longer-projecting support bosses 30, 30 with bolts 31, 31. As shown in FIGS. 7 and 11, the shroud upper portion 15 is formed with a plurality of mounting bosses 15 b, 15 b... At a portion facing the crankcase 2, and these are formed on the upper surface of the crankcase 2. Are fixed to the supporting bosses 40, 40... By bolts 32, 32. Thus, the shroud upper portion 15 and the shroud lower portion 16 are supported by the engine body 1.

さらにクランクケース２の直上において，シュラウド上部１５には複数のタンクステー３３，３３…が一体成形される。これらタンクステー３３，３３…のボルト孔に対応したウェルディングボルト３５，３５…及びウェルディングナット３６，３６…を有するブラケット３４が燃料タンクＴの底壁に固設されており，これらウェルディングボルト３５，３５…及びウェルディングナット３６，３６…に螺合緊締するナット３７，３７…及びボルト３８，３８…によりブラケット３４がタンクステー３３，３３…に固着される。こうして燃料タンクＴはシュラウド上部１５に支持される。   Further, a plurality of tank stays 33, 33... Are integrally formed in the shroud upper portion 15 immediately above the crankcase 2. A bracket 34 having welding bolts 35, 35,... Corresponding to the bolt holes of the tank stays 33, 33, and welding nuts 36, 36, is fixed to the bottom wall of the fuel tank T. The bracket 34 is fixed to the tank stays 33, 33 ... by nuts 37, 37 ... and bolts 38, 38 ... which are screwed and tightened to the 35, 35 ... and welding nuts 36, 36 .... Thus, the fuel tank T is supported by the shroud upper portion 15.

次に，この実施例の作用について説明する。   Next, the operation of this embodiment will be described.

エンジンＥの運転中，クランク軸６と共に回転する冷却ファン９によって，吸気ルーバ１７の多数の通気孔１７ａ，１７ａ…を通過した空気が吸入口１１ａから内側シュラウド１１内に吸入される。この内側シュラウド１１はスクロール型に形成されているから，上記吸入空気を効率良く昇圧して，多量の冷却風を吐出口１１ｂからシリンダ部３に向けて吐出することができる。特に，この鋼板製の内側シュラウド１１は，吸入口１１ａから吐出口１１ｂまでのスクロール部分のみを構成するものであるから，そのプレス成形は極めて容易であり，コストの低減及び重量増の抑制に寄与し得る。   During the operation of the engine E, the cooling fan 9 that rotates together with the crankshaft 6 sucks the air that has passed through the numerous air holes 17a, 17a... Of the intake louver 17 into the inner shroud 11 from the suction port 11a. Since the inner shroud 11 is formed in a scroll type, the intake air can be efficiently boosted and a large amount of cooling air can be discharged from the discharge port 11b toward the cylinder portion 3. In particular, since the inner shroud 11 made of steel plate constitutes only the scroll portion from the suction port 11a to the discharge port 11b, the press molding is extremely easy and contributes to cost reduction and suppression of weight increase. Can do.

シリンダ部３の周囲には，外側シュラウド１２により導風ダクト部２５が構成されているので，上記冷却風はその導風ダクト部２５に誘導されてシリンダ部３の全周面を流れ，そのシリンダ部３を効果的に冷却することができ，のみならず合成樹脂製の導風ダクト部２５によりシリンダ部３からの放射音を吸収，遮断してエンジンＥの静粛性を高めることができる。   Since the outer shroud 12 forms an air guide duct portion 25 around the cylinder portion 3, the cooling air is guided to the air guide duct portion 25 and flows through the entire circumferential surface of the cylinder portion 3. The portion 3 can be effectively cooled, and not only the synthetic resin air guide duct portion 25 can absorb and block the radiated sound from the cylinder portion 3 to improve the silence of the engine E.

また上記導風ダクト部２５には，排気マフラＭに向かって開口する排風口２６が設けられているから，シリンダ部３を冷却し終えた冷却風は，この排風口２６を出たとき，必然的に排気マフラＭに当たり，これを効果的に冷却することができ，同時にその排風音を排気マフラＭにより減衰させることができる。   Further, since the wind guide duct portion 25 is provided with an exhaust port 26 that opens toward the exhaust muffler M, the cooling air that has cooled the cylinder portion 3 inevitably comes out from the exhaust port 26. Therefore, the exhaust muffler M hits the exhaust muffler M and can be effectively cooled. At the same time, the exhaust muffler M can attenuate the exhaust noise.

ところで，内側シュラウド１１は，合成樹脂製の外側シュラウド１２に収容されているから，冷却ファン９による送気騒音が内側シュラウド１１から放射されても，これを外側シュラウド１２により遮断して，エンジンＥの静粛性を高めることができる。   By the way, since the inner shroud 11 is accommodated in the outer shroud 12 made of synthetic resin, even if air supply noise from the cooling fan 9 is radiated from the inner shroud 11, this is blocked by the outer shroud 12, and the engine E Can improve the silence.

しかも合成樹脂製の外側シュラウド１２には，内側シュラウド１１の形状に拘束されることなく所望の形状を付与することができるから，デザインの自由度を広げることができる。   In addition, the outer shape of the outer shroud 12 made of synthetic resin can be given a desired shape without being constrained by the shape of the inner shroud 11, so that the degree of freedom in design can be expanded.

また合成樹脂製の外側シュラウド１２は鋼板製のものより軽量であり，しかも鋼板製の内側シュラウド１１は，冷却ファン９を囲繞するスクロール部分で外側シュラウド１２と重なるのみであるから，シュラウド１０全体としての重量は軽く，エンジンＥの軽量化に大いに寄与し得る。   Further, the outer shroud 12 made of synthetic resin is lighter than that made of steel plate, and the inner shroud 11 made of steel plate only overlaps with the outer shroud 12 at the scroll portion surrounding the cooling fan 9, so that the shroud 10 as a whole. Is light and can greatly contribute to the weight reduction of the engine E.

またエンジン本体１に固着された鋼板製で高剛性の内側シュラウド１１は，外側シュラウド１２のシュラウド側部１４と，エンジンスタータ２４を支持する吸気ルーバ１７とを取り付けるブラケットの役割を果たすので，シュラウド側部１４及び吸気ルーバ１７の支持専用のブラケットをエンジン本体１に設ける必要がなくなり，構造の簡素化を図ると共に，更なる軽量化をも図ることができる。しかも，この場合，内側シュラウド１１と吸気ルーバ１７との間に合成樹脂製のシュラウド側部１４が介在することになるから，シュラウド側部１４が制振機能を発揮して，エンジン振動の吸気ルーバ１７及びエンジンスタータ２４への伝達を抑え，エンジンスタータ２４の耐久性を高めることができる。   The inner shroud 11 made of steel plate and rigidly fixed to the engine body 1 serves as a bracket for attaching the shroud side portion 14 of the outer shroud 12 and the intake louver 17 that supports the engine starter 24, so that the shroud side It is no longer necessary to provide the engine body 1 with a bracket dedicated to supporting the portion 14 and the intake louver 17, thereby simplifying the structure and further reducing the weight. In addition, in this case, since the shroud side portion 14 made of synthetic resin is interposed between the inner shroud 11 and the intake louver 17, the shroud side portion 14 exhibits a vibration damping function, and the intake louver for engine vibrations. 17 and transmission to the engine starter 24 can be suppressed, and the durability of the engine starter 24 can be improved.

一方，外側シュラウド１２の，クランクケース２の上面に固着される合成樹脂製のシュラウド上部１５には複数のタンクステー３３，３３…が一体成形され，これらによって燃料タンクＴが支持されるので，合成樹脂製のシュラウド上部１５及びタンクステー３３，３３…が制振機能を発揮してエンジンＥの振動を吸収し，燃料タンクＴへの振動伝達を抑えることができる。   On the other hand, a plurality of tank stays 33, 33... Are integrally formed on a synthetic resin shroud upper portion 15 fixed to the upper surface of the crankcase 2 of the outer shroud 12, and the fuel tank T is supported by these tank stays. The resin shroud upper portion 15 and the tank stays 33, 33... Exhibit a vibration damping function to absorb vibrations of the engine E and suppress vibration transmission to the fuel tank T.

またシュラウド上部１５は，クランクケース２からの放射熱及び放射音を遮断する遮熱及び遮音板の役割をも果たし，燃料タンクＴの加熱及び共鳴を防ぐことができる。のみならず燃料タンクＴを支持する専用の支持部材をエンジン本体１に取り付ける必要がないから，その支持構造の簡素化を図ることができる。   Further, the shroud upper portion 15 also serves as a heat insulating and sound insulating plate for blocking the radiant heat and radiated sound from the crankcase 2 and can prevent the fuel tank T from being heated and resonated. In addition, since it is not necessary to attach a dedicated support member for supporting the fuel tank T to the engine body 1, the support structure can be simplified.

その際，タンクステー３３，３３…は，外側シュラウド１２中，特に，燃料タンクＴに対向するシュラウド上部１５に形成されるので，該タンクステー３３，３３…の長さを最短に形成することができて，燃料タンクＴを強固に支持することができる。   In this case, since the tank stays 33, 33... Are formed in the outer shroud 12, particularly in the shroud upper portion 15 facing the fuel tank T, the tank stays 33, 33. Thus, the fuel tank T can be firmly supported.

結局，エンジン騒音に関しては，冷却ファン９の送風音を内外二重に配置される内側シュラウド１０及びシュラウド側部１４により遮断し，クランクケース２からの放射音の燃料タンクＴへの伝達をシュラウド上部１５で遮断し，シリンダ部３からの放射音を導風ダクト部２５で遮断し，導風ダクト部２５の排風口２６からの排風音を排気マフラＭにより減衰させるので，エンジンＥの静粛性を効果的に高めることができる。   Eventually, the engine noise is blocked by the inner shroud 10 and the shroud side portion 14 which are arranged inside and outside the cooling fan 9, and the transmission of the radiated sound from the crankcase 2 to the fuel tank T is transmitted to the upper portion of the shroud. 15, the radiated sound from the cylinder portion 3 is blocked by the air guide duct portion 25, and the exhaust sound from the exhaust port 26 of the air guide duct portion 25 is attenuated by the exhaust muffler M. Can be effectively increased.

本発明は，上記実施例に限定されるものではなく，その要旨を逸脱しない範囲で種々の設計変更が可能である。   The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention.

本発明に係る強制空冷エンジンの正面図。1 is a front view of a forced air cooling engine according to the present invention. 同エンジンの平面図。The top view of the engine. 同エンジンの側面図。The side view of the engine. 図１の４−４線断面図。FIG. 4 is a sectional view taken along line 4-4 of FIG. 同エンジンの外側シュラウドの分解状態正面図。The disassembled state front view of the outer shroud of the engine. 外側シュラウドの組立状態平面図。The assembly state top view of an outer side shroud. 同エンジンを，外側シュラウドの取り外し状態で示す，図１との対応図。FIG. 2 is a view corresponding to FIG. 1 showing the engine with the outer shroud removed. 同エンジンを，燃料タンク，エアクリーナ及び排気マフラの取り外し状態で示す，図２との対応図。Fig. 3 is a view corresponding to Fig. 2 showing the engine with the fuel tank, air cleaner and exhaust muffler removed. 図７の９−９線断面図。FIG. 9 is a cross-sectional view taken along line 9-9 in FIG. 7. 図７の１０−１０線断面図。FIG. 10 is a sectional view taken along line 10-10 in FIG. 7; 図７の１１−１１線断面図。FIG. 11 is a sectional view taken along line 11-11 in FIG. 7.

符号の説明Explanation of symbols

Ｅ・・・・・エンジン
Ｔ・・・・・燃料タンク
１・・・・・エンジン本体
２・・・・・クランクケース
３・・・・・シリンダ部
６・・・・・クランク軸
９・・・・・冷却ファン
１２・・・・シュラウド（外側シュラウド）
３３・・・・タンクステー E ... Engine T ... Fuel tank 1 ... Engine body 2 ... Crankcase 3 ... Cylinder 6 ... Crankshaft 9 ... ... Cooling fan 12 ... Shroud (outside shroud)
33 ... Tank stay

Claims (2)

クランクケース（２）と，このクランクケース（２）から一側方に突出したシリンダ部（３）とを備えたエンジン本体（１）の上方に燃料タンク（Ｔ）を配設し，クランクケース（２）に支承されたクランク軸（６）の一端に冷却ファン（９）を付設し，この冷却ファン（９）により生起された冷却風をシリンダ部（３）へ誘導するシュラウド（１２）をエンジン本体（１）に固着した強制空冷エンジンにおいて，
前記シュラウド（１２）を合成樹脂製とすると共に，このシュラウド（１２）に，燃料タンク（Ｔ）を支持する複数のタンクステー（３３）を一体に成形したことを特徴とする，強制空冷エンジンにおける燃料タンク支持構造。 A fuel tank (T) is disposed above an engine body (1) having a crankcase (2) and a cylinder portion (3) protruding from the crankcase (2) to one side. 2) A cooling fan (9) is attached to one end of the crankshaft (6) supported by 2), and a shroud (12) for guiding the cooling air generated by the cooling fan (9) to the cylinder part (3) is provided in the engine. In the forced air cooling engine fixed to the main body (1),
In the forced air-cooled engine, the shroud (12) is made of synthetic resin, and a plurality of tank stays (33) supporting the fuel tank (T) are integrally formed on the shroud (12). Fuel tank support structure. 請求項１記載の強制空冷エンジンにおける燃料タンク支持構造において，
前記シュラウド（１２）を，エンジン本体（１）の，燃料タンク（Ｔ）に対向する上面を覆うように形成し，その上面を覆う部分に前記タンクステー（３３）を一体に形成したことを特徴とする，強制空冷エンジンにおける燃料タンク支持構造。
The fuel tank support structure for a forced air-cooled engine according to claim 1,
The shroud (12) is formed so as to cover an upper surface of the engine body (1) facing the fuel tank (T), and the tank stay (33) is integrally formed in a portion covering the upper surface. A fuel tank support structure for a forced air-cooled engine.
JP2004163723A 2004-06-01 2004-06-01 Fuel tank support structure for forced air cooling engine Expired - Fee Related JP4466998B2 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102797563A (en) * 2012-08-28 2012-11-28 力帆实业(集团)股份有限公司 Petrol engine with underneath type oil tank
JP2013151913A (en) * 2012-01-25 2013-08-08 Yanmar Co Ltd Engine
CN110552809A (en) * 2019-09-06 2019-12-10 四川千贻达机械有限责任公司 Small-size general gasoline engine crankcase with forced cooling air duct

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013151913A (en) * 2012-01-25 2013-08-08 Yanmar Co Ltd Engine
CN102797563A (en) * 2012-08-28 2012-11-28 力帆实业(集团)股份有限公司 Petrol engine with underneath type oil tank
CN110552809A (en) * 2019-09-06 2019-12-10 四川千贻达机械有限责任公司 Small-size general gasoline engine crankcase with forced cooling air duct

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