JP4489645B2 - General-purpose engine muffler - Google Patents

General-purpose engine muffler Download PDF

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JP4489645B2
JP4489645B2 JP2005182770A JP2005182770A JP4489645B2 JP 4489645 B2 JP4489645 B2 JP 4489645B2 JP 2005182770 A JP2005182770 A JP 2005182770A JP 2005182770 A JP2005182770 A JP 2005182770A JP 4489645 B2 JP4489645 B2 JP 4489645B2
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muffler
pipe
exhaust
housing
general
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JP2007002712A (en
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義一 佐藤
一弘 坂本
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2005182770A priority Critical patent/JP4489645B2/en
Priority to MYPI2010003224A priority patent/MY148994A/en
Priority to MYPI20062777A priority patent/MY149983A/en
Priority to ES09178550T priority patent/ES2374697T3/en
Priority to KR1020077027735A priority patent/KR100964592B1/en
Priority to CA2607271A priority patent/CA2607271C/en
Priority to CA2807474A priority patent/CA2807474C/en
Priority to ES06767214T priority patent/ES2396433T3/en
Priority to CN200680022435XA priority patent/CN101203663B/en
Priority to PCT/JP2006/312564 priority patent/WO2006137506A2/en
Priority to US11/913,144 priority patent/US7896127B2/en
Priority to EP09178550A priority patent/EP2177727B1/en
Priority to EP06767214A priority patent/EP1891308B1/en
Priority to TW095121615A priority patent/TWI359899B/en
Priority to PE2006000706A priority patent/PE20070258A1/en
Priority to ARP060102694A priority patent/AR053932A1/en
Priority to PE2010000981A priority patent/PE20100831A1/en
Priority to PA20068681601A priority patent/PA8681601A1/en
Publication of JP2007002712A publication Critical patent/JP2007002712A/en
Priority to CL2008003935A priority patent/CL2008003935A1/en
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Description

本発明は、エンジンの排気ポートに排気管を介して取付ける汎用エンジンのマフラに関するものである。   The present invention relates to a muffler for a general-purpose engine that is attached to an exhaust port of an engine via an exhaust pipe.

汎用エンジンのマフラとして、エンジンのシリンダブロックの上方若しくは側方にマフラを設けたものが実用に供されている。
実用の汎用エンジンのマフラは、エンジンの使用用途に応じてマフラ使用を適宜設計変更をすれば実用上十分であった。 As a muffler of a general-purpose engine, a muffler provided with a muffler above or on the side of a cylinder block of the engine is put into practical use.
A practical general-purpose engine muffler was practically sufficient if the design of the muffler was appropriately changed according to the intended use of the engine.

このような汎用エンジンのマフラとして、シリンダブロックの側面にマフラを直接的に取付けたものが知られている（例えば、特許文献１参照。）。
実開平２−９９２１４号公報（第１頁、第１図） As such a general-purpose engine muffler, one in which a muffler is directly attached to a side surface of a cylinder block is known (for example, see Patent Document 1).
Japanese Utility Model Publication No. 2-99214 (first page, FIG. 1)

図１３は従来の基本構成を説明する図であり、汎用エンジンのマフラ３００は、下側ハウジング３０１及び上側ハウジング３０２と、これらのハウジング３０１，３０２を仕切る仕切り壁３０３と、から構成したものであって、下側ハウジング３０１及び仕切り壁３０３で第１の消音室３０４を形成し、上側ハウジング３０２及び仕切り壁３０３で第２の消音室３０５を形成するものである。   FIG. 13 is a diagram for explaining a conventional basic configuration, and a muffler 300 of a general-purpose engine includes a lower housing 301 and an upper housing 302, and a partition wall 303 that partitions the housings 301 and 302. The lower housing 301 and the partition wall 303 form a first silencing chamber 304, and the upper housing 302 and the partition wall 303 form a second silencing chamber 305.

さらに、下側ハウジング３０１に、シリンダブロック３０６の排気ポート３０７から排気ガスを導入する導入口３０８を設け、上側ハウジング３０２に排気ガスを放出する排気口３０９を設け、仕切り壁３０３にドーム状の凹部３１１を設けるとともに、第１の消音室３０４から第２の消音室３０５に排気ガスを流す排気連通口３１２，３１２を設けたものである。   Further, the lower housing 301 is provided with an introduction port 308 for introducing exhaust gas from the exhaust port 307 of the cylinder block 306, the upper housing 302 is provided with an exhaust port 309 for discharging exhaust gas, and the partition wall 303 has a dome-shaped recess. 311 and exhaust communication ports 312 and 312 through which exhaust gas flows from the first silencing chamber 304 to the second silencing chamber 305 are provided.

しかし、汎用エンジンのマフラ３００では、シリンダブロック３０６の側面に排気ポート３０７を設け、この排気ポート３０７から第１の消音室３０４に排気ガスを放出させ、
この排気ガスを第１の消音室３０４に形成したドーム状の凹部３１１に当てるようにしたものであり、ドーム状の凹部３１１を第１・第２の消音室３０４，３０５を仕切る仕切り壁３０３に形成したものなので、例えば、ドーム状の凹部３１１に排気ガスを当てるときに、排気ガスを冷却して熱エネルギーを減らすことはできない。 However, in the muffler 300 of the general-purpose engine, an exhaust port 307 is provided on the side surface of the cylinder block 306, and exhaust gas is discharged from the exhaust port 307 to the first silencing chamber 304,
This exhaust gas is applied to the dome-shaped recess 311 formed in the first silencing chamber 304, and the dome-shaped recess 311 is applied to the partition wall 303 that partitions the first and second silencing chambers 304 and 305. For example, when the exhaust gas is applied to the dome-shaped recess 311, the exhaust gas cannot be cooled to reduce thermal energy.

従って、汎用エンジンのマフラ３００では、排気ガスをマフラ３００内で冷却することは難しく、排気ガスを冷やして熱エネルギーを減らすことによる排気音の低減を望むことはできない。   Therefore, in the muffler 300 of the general-purpose engine, it is difficult to cool the exhaust gas in the muffler 300, and it is impossible to reduce the exhaust noise by cooling the exhaust gas and reducing the thermal energy.

すなわち、排気ガスをマフラ内で冷却することで、排気音の低減を図ることができる汎用エンジンのマフラが望まれる。   That is, a muffler for a general-purpose engine that can reduce exhaust noise by cooling the exhaust gas in the muffler is desired.

本発明は、排気ガスをマフラ内で冷却することは難しい点を解決し、排気ガスをマフラ内で冷却することで、排気音の低減を図ることができる汎用エンジンのマフラを提供することを課題とする。   It is an object of the present invention to provide a general-purpose engine muffler that can solve the difficulty of cooling the exhaust gas in the muffler and can reduce exhaust noise by cooling the exhaust gas in the muffler. And

請求項１に係る発明は、エンジンの排気ポートに排気管を介して接続する汎用エンジンのマフラにおいて、このマフラを、排気管から排気ガスを導入する導入管と、この導入管から排気ガスを送込む消音室と、この消音室から排気ガスを外界に放出する排出管と、これらの排出管及び導入管を収納するとともに消音室を形成するハウジングと、から構成し、ハウジングを、排気管側に形成される下部ハウジングと、この下部ハウジングに被せられる上部ハウジングと、から構成し、下部ハウジングに、エンジンを水平状態にしたときの水平面に対して傾斜させた傾斜面が形成され、この傾斜面と上部ハウジングとの間に導入管が貫通され、導入管の傾斜面側を排気管に接続するとともに、導入管の上部ハウジング側を蓋部材で塞ぎ、この蓋部材をハウジングから外界に臨ませたことを特徴とする。 The invention according to claim 1 is a general-purpose engine muffler connected to an exhaust port of an engine via an exhaust pipe. The muffler includes an introduction pipe for introducing exhaust gas from the exhaust pipe, and an exhaust gas sent from the introduction pipe. A silencing chamber, a discharge pipe that discharges exhaust gas from the silencing chamber to the outside, and a housing that houses the discharge pipe and the introduction pipe and forms the silencing chamber, and the housing is disposed on the exhaust pipe side. The lower housing is formed, and the upper housing is placed on the lower housing, and the lower housing is formed with an inclined surface inclined with respect to a horizontal plane when the engine is in a horizontal state. the introduction tube is penetrating between the upper housing, with connecting inclined surface of the inlet pipe to the exhaust pipe, closing the upper housing side of the introduction tube with a lid member, the lid The is characterized in that to face the outside from the housing.

例えば、マフラの中で排気ガスの冷却を図ることができるとすれば、マフラ中で排気ガスの熱エネルギーを消失させることができるので、排気音を低減する上で好ましいことである。   For example, if the exhaust gas can be cooled in the muffler, the thermal energy of the exhaust gas can be lost in the muffler, which is preferable in reducing exhaust noise.

そこで、マフラを、排気管から排気ガスを導入する導入管と、この導入管から排気ガスを送込む消音室と、この消音室から排気ガスを外界に放出する排出管と、これらの排出管及び導入管を収納するとともに消音室を形成するハウジングと、から構成し、ハウジングを、排気管側に形成される下部ハウジングと、この下部ハウジングに被せられる上部ハウジングと、から構成し、下部ハウジングに、エンジンを水平状態にしたときの水平面に対して傾斜させた傾斜面が形成され、この傾斜面と上部ハウジングとの間に導入管が貫通され、導入管の傾斜面側を排気管に接続するとともに、導入管の上部ハウジング側を蓋部材で塞ぎ、この蓋部材をハウジングから外界に臨ませた。 Therefore, the muffler has an introduction pipe for introducing the exhaust gas from the exhaust pipe, a silencer chamber for sending the exhaust gas from the introduction pipe, a discharge pipe for releasing the exhaust gas from the silencer chamber to the outside, and these discharge pipes and A housing that houses the introduction pipe and forms a silencing chamber, and a housing that includes a lower housing formed on the exhaust pipe side and an upper housing that covers the lower housing. An inclined surface that is inclined with respect to a horizontal plane when the engine is leveled is formed, an introduction pipe is passed between the inclined surface and the upper housing, and the inclined surface side of the introduction pipe is connected to the exhaust pipe. The upper housing side of the introduction tube was closed with a lid member , and this lid member was exposed to the outside from the housing.

すなわち、下部ハウジングに、エンジンを水平状態にしたときの水平面に対して傾斜させた傾斜面が形成され、この傾斜面と上部ハウジングとの間に導入管が貫通され、導入管の傾斜面側を排気管に接続するとともに、導入管の上部ハウジング側を蓋部材で塞ぎ、この蓋部材をハウジングから外界に臨ませることで、蓋部材に排気ガスを当てるときに排気ガスを冷却することができる。 That is, the lower housing, the inclined surface is inclined relative to a horizontal plane when the engine in a horizontal state is formed, introduction pipe between the inclined surface and the upper housing are through, the inclined surface of the inlet tube The exhaust gas can be cooled when exhaust gas is applied to the lid member by connecting to the exhaust pipe , closing the upper housing side of the introduction pipe with the lid member , and facing this lid member from the housing to the outside.

請求項２に係る発明は、蓋部材を、ハウジングから突出させたことを特徴とする。
蓋部材を、ハウジングから突出させることで、冷却効果の促進を図ることができる。 The invention according to claim 2 is characterized in that the lid member protrudes from the housing.
The cooling effect can be promoted by protruding the lid member from the housing.

請求項３に係る発明は、排気管に、導入管側近傍にて導入管へ同軸に沿わすための屈曲部を備えたことを特徴とする。
排気管に、導入管側近傍にて導入管へ同軸に沿わすための屈曲部を備えることで、導入管の中で導入管の一端から他端に向かわす排気ガスの流れと、他端でＵターンさせ一端に向かわす排気ガスの流れとを円滑に作り出すことができる。 The invention according to claim 3 is characterized in that the exhaust pipe is provided with a bent portion to be coaxial with the introduction pipe in the vicinity of the introduction pipe.
By providing the exhaust pipe with a bent portion to be coaxial with the introduction pipe in the vicinity of the introduction pipe, the flow of the exhaust gas from one end of the introduction pipe to the other end in the introduction pipe and the other end It is possible to smoothly create a flow of exhaust gas that makes a U-turn and travels toward one end.

請求項４に係る発明は、導入管を、排出管に対して略直交させたことを特徴とする。
導入管を、排出管に対して略直交させることで、導入管及び排出管のそれぞれの長さを長く形成することができる。 The invention according to claim 4 is characterized in that the introduction pipe is substantially orthogonal to the discharge pipe.
By making the introduction pipe substantially orthogonal to the discharge pipe, the length of each of the introduction pipe and the discharge pipe can be increased.

請求項１に係る発明では、下部ハウジングに、エンジンを水平状態にしたときの水平面に対して傾斜させた傾斜面が形成され、この傾斜面と上部ハウジングとの間に導入管が貫通され、導入管の傾斜面側を排気管に接続するとともに、導入管の上部ハウジング側を蓋部材で塞ぎ、この蓋部材をハウジングから外界に臨ませたので、排気管から導入された排気ガスを一旦蓋部材に当てることができ、蓋部材をハウジングから外界に臨ませたので、蓋部材に排気ガスを当てるときに排気ガスを冷却することができる。この結果、排気ガスの熱エネルギーを低減させることができ、排気音の低減を図ることができるという利点がある。 In the invention according to claim 1, the lower housing is formed with an inclined surface which is inclined with respect to a horizontal plane when the engine is in a horizontal state, and an introduction pipe is inserted between the inclined surface and the upper housing, The inclined surface side of the pipe is connected to the exhaust pipe, the upper housing side of the introduction pipe is closed with a lid member , and this lid member is exposed to the outside from the housing, so the exhaust gas introduced from the exhaust pipe is temporarily covered with the lid member Since the lid member is exposed to the outside from the housing, the exhaust gas can be cooled when the exhaust gas is applied to the lid member. As a result, there is an advantage that the heat energy of the exhaust gas can be reduced and the exhaust noise can be reduced.

請求項２に係る発明では、蓋部材を、ハウジングから突出させたので、冷却効果の促進を図ることができる。この結果、さらなる排気ガスの熱エネルギーを低減を図ることができ、さらなる排気音の低減をすることができるという利点がある。   In the invention according to claim 2, since the lid member protrudes from the housing, the cooling effect can be promoted. As a result, there is an advantage that the heat energy of the exhaust gas can be further reduced and the exhaust noise can be further reduced.

請求項３に係る発明では、排気管に、導入管側近傍にて導入管へ同軸に沿わすための屈曲部を備えたので、導入管の中で導入管の一端から他端に向かわす排気ガスの流れと、他端でＵターンさせ一端に向かわす排気ガスの流れとを円滑に作り出すことができる。この結果、さらなる排気ガスの冷却効果を促進することができるという利点がある。   In the invention according to claim 3, since the exhaust pipe is provided with a bent portion in the vicinity of the introduction pipe in the vicinity of the introduction pipe, the exhaust pipe is directed from one end of the introduction pipe to the other end in the introduction pipe. A gas flow and an exhaust gas flow that is U-turned at the other end and directed toward one end can be smoothly produced. As a result, there is an advantage that a further exhaust gas cooling effect can be promoted.

請求項４に係る発明では、導入管を、排出管に対して略直交させたので、導入管及び排出管のそれぞれの長さを長く形成することができる。この結果、排気音の低減を図ることができるという利点がある。   In the invention which concerns on Claim 4, since the introduction pipe was made substantially orthogonal with respect to the discharge pipe, each length of an introduction pipe and a discharge pipe can be formed long. As a result, there is an advantage that exhaust noise can be reduced.

本発明を実施するための最良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は本発明に係るマフラを採用した汎用エンジン正面図であり、内燃機関としてのエンジン（汎用エンジン）１０は、オイル（潤滑油）１２を貯留するクランクケース１３と、このクランクケース１３に水平に且つ回転自在に取付けた出力軸としてのクランク軸１４と、クランクケース１３に一体的に且つ傾斜させて形成した１個のシリンダブロック１５と、このシリンダブロック１５のシリンダ１６にスライド可能に取付けたピストン１７と、これらのピストン１７及びクランク軸１４を連結するコンロッド１８と、シリンダブロック１５の開口１９に取付けたシリンダヘッド２１と、このシリンダヘッド２１の吸気ポート２２に昇降自在に取付けた吸気弁２４と、シリンダヘッド２１の排気ポート２３に取付けた昇降自在に排気弁２５と、を主要構成とする単気筒且つ傾斜シリンダ型のＯＨＣ（overhead camshaft）式空冷エンジンである。 The best mode for carrying out 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 front view of a general-purpose engine that employs a muffler according to the present invention. An engine (general-purpose engine) 10 as an internal combustion engine includes a crankcase 13 that stores oil (lubricating oil) 12 and a horizontal position on the crankcase 13. And a crankshaft 14 as an output shaft mounted rotatably, a single cylinder block 15 formed integrally with the crankcase 13 and inclined, and a cylinder 16 of the cylinder block 15 slidably mounted. The piston 17, the connecting rod 18 connecting the piston 17 and the crankshaft 14, the cylinder head 21 attached to the opening 19 of the cylinder block 15, and the intake valve 24 attached to the intake port 22 of the cylinder head 21 so as to be movable up and down. And an exhaust valve 25 attached to the exhaust port 23 of the cylinder head 21 so as to be movable up and down. A single cylinder and inclined-cylinder OHC (overhead camshaft) type air-cooled engine using as a main configuration.

なお、２６はグランド面（水平面）を示し、シリンダブロック１５はグランド面（水平面）に対して傾斜させたものである。   Reference numeral 26 denotes a ground plane (horizontal plane), and the cylinder block 15 is inclined with respect to the ground plane (horizontal plane).

また、エンジン本体２７を、クランクケース１３、シリンダブロック１５、シリンダヘッド２１、クランク軸１４、コンロッド１８、ピストン１７、吸気弁２４及び排気弁２５で構成し、クランクケース１３、シリンダブロック１５、シリンダヘッド２１でエンジン本体２７のケーシング２８を構成し、シリンダブロック１５及びシリンダヘッド２１で燃焼室２９を構成する。   The engine body 27 includes a crankcase 13, a cylinder block 15, a cylinder head 21, a crankshaft 14, a connecting rod 18, a piston 17, an intake valve 24, and an exhaust valve 25. The crankcase 13, the cylinder block 15, and the cylinder head. 21 constitutes a casing 28 of the engine body 27, and the cylinder block 15 and the cylinder head 21 constitute a combustion chamber 29.

また、クランク軸１４は、動力取出しのための軸でもあり、一端に動力取出し部３１を形成し、この動力取出し部３１をＰＴＯ（power take-off）と呼ぶことがある。
シリンダヘッド２１は、吸気弁２４及び排気弁２５をクランク軸１４の回転で駆動するための動弁室３２を備える。図中、３３はオイルレベルゲージ、４１はマフラカバー、４５はマフラカバー４１に取付けた排気ガスの出口である排出パイプを示す。 The crankshaft 14 is also a shaft for taking out power, and a power take-out portion 31 is formed at one end, and the power take-out portion 31 is sometimes called PTO (power take-off).
The cylinder head 21 includes a valve operating chamber 32 for driving the intake valve 24 and the exhaust valve 25 by the rotation of the crankshaft 14. In the figure, 33 is an oil level gauge, 41 is a muffler cover, and 45 is a discharge pipe that is an outlet of exhaust gas attached to the muffler cover 41.

図２は本発明に係るマフラを採用した汎用エンジン側面図であり、エンジン１０は、エンジン本体２７に、エンジン１０作動のための付属品である補機類を備え、その主なものとして、外気を引込むエアクリーナ３５と、燃料（ガソリン）を気化させ燃焼室２９（図１参照）に送込むキャブレタ３６と、燃料を貯留する燃料タンク３７と、排気ガスの排気音の低減を図るマフラ４０（図１参照）と、エンジン１０を始動するリコイルスタータ３９と、オイルレベル（潤滑油レベル）を検知するオイルレベル検知装置（オイルアラート）５０と、点火のためのイグニッション部（不図示）を内蔵したプラグキャップ６０と、を付設したものである。   FIG. 2 is a side view of a general-purpose engine that employs a muffler according to the present invention. The engine 10 includes auxiliary equipment, which is an accessory for operating the engine 10, in the engine body 27. An air cleaner 35 that draws in fuel, a carburetor 36 that vaporizes fuel (gasoline) and sends it to the combustion chamber 29 (see FIG. 1), a fuel tank 37 that stores fuel, and a muffler 40 that reduces exhaust noise of the exhaust gas (see FIG. 1), a recoil starter 39 for starting the engine 10, an oil level detection device (oil alert) 50 for detecting the oil level (lubricating oil level), and a plug incorporating an ignition unit (not shown) for ignition. A cap 60 is attached.

図中、４２はオイルを補給するオイル供給口、４３は一端をシリンダヘッド２１から延出し他端にマフラ４０を取付けた排気管、４４はリコイルスタータ３９の始動ノブ（グリップ）を示す。   In the figure, 42 is an oil supply port for supplying oil, 43 is an exhaust pipe having one end extending from the cylinder head 21 and having a muffler 40 attached to the other end, and 44 is a starting knob (grip) of the recoil starter 39.

図３は本発明に係るマフラを採用した汎用エンジン背面図であり、エンジン１０は、クランク軸１４の動力取出し部３１（図１参照）の対向側に発電機（不図示）及び冷却ファン４７を内側からこの順に取付け、この冷却ファン４７をファンカバー４８で囲み、始動時にクランク軸１４（図１参照）に噛合わせて回転させるリコイルスタータ３９を設け、このリコイルスタータ３９をリコイルスタータカバー４９で覆い、このリコイルスタータカバー４９の側方上部にメインパネル５２を配置し、このメインパネル５２に連続させるとともに燃料タンク３７及びリコイルスタータカバー４９の間に内部を覆うカバーパネル５３を設けたものである。   FIG. 3 is a rear view of a general-purpose engine that employs a muffler according to the present invention. The engine 10 includes a generator (not shown) and a cooling fan 47 on the opposite side of the power take-out portion 31 (see FIG. 1) of the crankshaft 14. The cooling fan 47 is mounted in this order from the inside, the cooling fan 47 is surrounded by a fan cover 48, and a recoil starter 39 is provided that meshes with and rotates with the crankshaft 14 (see FIG. 1) at the start. A main panel 52 is arranged on the upper side of the recoil starter cover 49, and a cover panel 53 is provided between the fuel tank 37 and the recoil starter cover 49 so as to be continuous with the main panel 52.

なお、メインパネル５２及びカバーパネル５３で操作パネルを構成し、メインパネル５２は、エンジン１０をＯＮ状態に設定する操作部材としてのスイッチノブ５４と、キャブレタ３６（図２参照）に備えたガバナモータ（不図示）の特性を調整する操作部材としての調整ツマミ５５と、を配置したものである。   The main panel 52 and the cover panel 53 constitute an operation panel. The main panel 52 includes a switch knob 54 as an operation member for setting the engine 10 to an ON state, and a governor motor (see FIG. 2) provided in the carburetor 36 (see FIG. 2). And an adjustment knob 55 as an operation member for adjusting the characteristic (not shown).

図４は本発明に係る汎用エンジンのマフラの取付状態を示す側面図であり、マフラ４０は、シリンダヘッド２１の排気ポート２３に排気管４３の一端を取付けた排気管４３の他端に取付けるとともに、マフラ４０側から支持ブラケット（ステー）８１を延ばし、この支持ブラケット８１をシリンダヘッド２１（エンジン本体２７側）に設けたマフラ支持部８２に取付けたものである。すなわち、マフラ４０は、排気管４３の他端に２点支持し且つマフラ支持部８２に１点支持することで、エンジン本体２７側に３点支持したものである。   FIG. 4 is a side view showing the attachment state of the muffler of the general-purpose engine according to the present invention. The muffler 40 is attached to the other end of the exhaust pipe 43 in which one end of the exhaust pipe 43 is attached to the exhaust port 23 of the cylinder head 21. A support bracket (stay) 81 is extended from the muffler 40 side, and this support bracket 81 is attached to a muffler support portion 82 provided on the cylinder head 21 (engine body 27 side). That is, the muffler 40 is supported at three points on the engine body 27 side by supporting two points on the other end of the exhaust pipe 43 and supporting one point on the muffler support portion 82.

排気管４３は、排気ポート２３に一端を取付けるために、一端に排気管４３の中心を挟んで左右の排気ポート側取付部８３，８３（一方の８３は不図示）を形成し、マフラ４０に他端を連結するために、他端に排気管４３の中心を挟んで左右のマフラ側連結部８４，８４（一方の８４は不図示）を形成したものであって、マフラ４０の導入管（入口管）８５側近傍にて排気ガスを導入管８５へ同軸に沿わすための屈曲部８６を形成したものである。図中、８７はシリンダヘッド２１側のスタッドボルト、８８はガスケット、８９はスタッドボルト８７にねじ込むナット、９１はマフラ４０側のスタッドボルト、９２はスタッドボルト９１にねじ込むナット、１１８はマフラ支持部８２に支持ブラケットを止めるボルトである。   In order to attach one end to the exhaust port 23, the exhaust pipe 43 forms left and right exhaust port side attachment portions 83, 83 (one 83 is not shown) sandwiching the center of the exhaust pipe 43 at one end. In order to connect the other end, left and right muffler side connecting portions 84 and 84 (one 84 is not shown) are formed at the other end with the center of the exhaust pipe 43 interposed therebetween. In the vicinity of the inlet pipe) 85 side, a bent portion 86 is formed for the exhaust gas to be coaxial with the introduction pipe 85. In the figure, 87 is a stud bolt on the cylinder head 21 side, 88 is a gasket, 89 is a nut screwed into the stud bolt 87, 91 is a stud bolt on the muffler 40 side, 92 is a nut screwed into the stud bolt 91, 118 is a muffler support portion 82 It is a bolt that stops the support bracket.

なお、排気管４３に屈曲部８６を形成することで、エンジン１０振動を抑制する効果も持ち合わせる。   In addition, by forming the bent portion 86 in the exhaust pipe 43, it also has the effect of suppressing the vibration of the engine 10.

図５は本発明に係る汎用エンジンのマフラを取付ける排気ポートの平面図であり、図６は図５の６−６線断面図であり、図５に示す排気ポート２３は、図６に示す排気管４３の左右の排気ポート側取付部８３，８３を取付けるためにスタッドボルト（排気ポート側スタッドボルト）８７，８７を埋込んだものであり、排気管４３は、スタッドボルト８７，８７にガスケット８８を載置して左右の排気ポート側取付部８３，８３を嵌合させ、これらの排気ポート側取付部８３，８３を上方からナット８９，８９（図６参照）で排気ポート２３に固定するものである。   5 is a plan view of an exhaust port for mounting a muffler of a general-purpose engine according to the present invention, FIG. 6 is a sectional view taken along line 6-6 of FIG. 5, and the exhaust port 23 shown in FIG. Stud bolts (exhaust port side stud bolts) 87 and 87 are embedded in order to attach the left and right exhaust port side mounting portions 83 and 83 of the pipe 43. The exhaust pipe 43 is provided with a gasket 88 on the stud bolts 87 and 87. Are fitted to the left and right exhaust port side mounting portions 83, 83, and these exhaust port side mounting portions 83, 83 are fixed to the exhaust port 23 with nuts 89, 89 (see FIG. 6) from above. It is.

図４に示すように、排気ポート２３側のスタッドボルト８７，８７の延出方向を、後述するマフラ４０側のスタッドボルト（マフラ側スタッドボルト）９１，９１の延出方向を異ならせることで、マフラ４０の組付け性若しくは取外し性を向上させることができるものである。   As shown in FIG. 4, the extension direction of stud bolts 87 and 87 on the exhaust port 23 side is made different from the extension direction of stud bolts (muffler side stud bolts) 91 and 91 on the muffler 40 side described later. The assembling property or the detaching property of the muffler 40 can be improved.

次にマフラの構造を説明する。
図７は本発明に係る汎用エンジンのマフラの側面断面図であり、マフラ４０は、排気管４３側に形成することで下部を構成するハウジングとしての下部ハウジング９４と、この下部ハウジング９４に被せたハウジングとしての上部ハウジング９３と、これらの上部・下部ハウジング９３，９４を仕切るために二層に設けた仕切り壁としてのの上の仕切り壁９５及び仕切り壁としての下の仕切り壁９６と、これらの上部・下部ハウジング９３，９４及び上・下の仕切り壁９５，９６に貫通させる導入管（入口管）８５と、上の仕切り壁９５及び下の仕切り壁９６で挟み込んだ排出管（出口管）９７と、上・下の仕切り壁９５，９６及び排出管９７の間に介在させた音のエネルギーの吸収を図る吸音材（グラスウール）９８と、下部ハウジング９４を補強する補強プレート９９と、から構成する。 Next, the structure of the muffler will be described.
FIG. 7 is a side sectional view of the muffler of the general-purpose engine according to the present invention. The muffler 40 is formed on the exhaust pipe 43 side, and the lower housing 94 as a housing constituting the lower portion is covered with the lower housing 94. An upper housing 93 as a housing, an upper partition wall 95 as a partition wall provided in two layers for partitioning these upper and lower housings 93, 94, and a lower partition wall 96 as a partition wall; An introduction pipe (inlet pipe) 85 penetrating the upper and lower housings 93, 94 and the upper and lower partition walls 95, 96, and a discharge pipe (outlet pipe) 97 sandwiched between the upper partition wall 95 and the lower partition wall 96. A sound absorbing material (glass wool) 98 for absorbing sound energy interposed between the upper and lower partition walls 95 and 96 and the discharge pipe 97; and the lower housing 9 A reinforcing plate 99 for reinforcing the, consist.

さらに、マフラ４０は、下部ハウジング９４及び下の仕切り壁９６で消音室としての第１の消音室１０１を形成し、上部ハウジング９３及び上の仕切り壁９５で消音室としての第２の消音室１０２を形成し、上の仕切り壁９５及び下の仕切り壁９６で消音室としての第３の消音室１０３を形成するとともに、上の仕切り壁９５及び下の仕切り壁９６で吸音材９８を収納する吸音材収納部１０４を形成する。図中、１０５はマフラ４０の底面を示す。   Further, in the muffler 40, a first silencing chamber 101 as a silencing chamber is formed by the lower housing 94 and the lower partition wall 96, and a second silencing chamber 102 as a silencing chamber is formed by the upper housing 93 and the upper partition wall 95. And the upper partition wall 95 and the lower partition wall 96 form the third sound deadening chamber 103 as a sound deadening chamber, and the upper partition wall 95 and the lower partition wall 96 store the sound absorbing material 98. The material storage portion 104 is formed. In the figure, reference numeral 105 denotes the bottom surface of the muffler 40.

導入管８５は、一端を排気管４３に接続するために開口させた開口部としての導入管開口部１０６と、他端を塞ぐために他端に設けた蓋部材１０７と、排気ガスを導入管８５から第１の消音室１０１に導くために一端寄り（排気管４３側）に設けた複数の導入管側ガス孔１０８・・・（・・・は複数個を示す。以下同じ）と、からなる。   The introduction pipe 85 has an introduction pipe opening 106 as an opening opened at one end to connect to the exhaust pipe 43, a lid member 107 provided at the other end to close the other end, and an exhaust gas through the introduction pipe 85. A plurality of introduction pipe side gas holes 108 (... indicate a plurality, the same shall apply hereinafter) provided near one end (exhaust pipe 43 side) to lead to the first muffler chamber 101. .

下部ハウジング９４は、図１に示すグランド面（水平面）２６に対して傾斜させた傾斜面１１１と、この傾斜面１１１に形成することで導入管８５の導入管開口部１０６に合わせる（かしめる）合わせ口１１２と、この合わせ口１１２の廻りに形成することで排気管４３を取付けるスタッドボルト９１と、シリンダヘッド２１のマフラ支持部８２（図４参照）に取付ける先に示した支持ブラケット８１と、を備える。図中、１１７は支持ブラケット８１に形成したボルト貫通孔である。   The lower housing 94 is inclined with respect to the ground surface (horizontal plane) 26 shown in FIG. 1 and is formed on the inclined surface 111 so as to be fitted (caulked) to the introduction pipe opening 106 of the introduction pipe 85. A mating port 112, a stud bolt 91 for mounting the exhaust pipe 43 by being formed around the mating port 112, a support bracket 81 shown above to be attached to the muffler support portion 82 (see FIG. 4) of the cylinder head 21, Is provided. In the figure, 117 is a bolt through hole formed in the support bracket 81.

上部ハウジング９３は、外周に下部ハウジング９４及び上・下の仕切り壁９５，９６を一体的に固定するかしめ部１１４と、導入管８５の一端を排気管４３側とするときに導入管の他端（蓋部材１０７）を外界に臨ませる上部ハウジング孔１１５と、マフラカバー４１を止めるための止め金具１１６と、を備える。   The upper housing 93 includes a caulking portion 114 that integrally fixes the lower housing 94 and the upper and lower partition walls 95 and 96 to the outer periphery, and the other end of the introduction pipe when one end of the introduction pipe 85 is the exhaust pipe 43 side. An upper housing hole 115 that allows the (cover member 107) to face the outside, and a stopper 116 for stopping the muffler cover 41 are provided.

すなわち、汎用エンジンのマフラ４０は、エンジン１０（図１参照）の排気ポート２３に排気管４３を介して接続する汎用エンジンのマフラ４０において、このマフラ４０を、排気管４３から排気ガスを導入する導入管８５と、この導入管８５から排気ガスを送込む消音室１０１〜１０３と、消音室１０１〜１０３から排気ガスを外界に放出する排出管（出口管）９７と、これらの排出管９７及び導入管８５を収納するとともに消音室１０１〜１０３を形成する上部・下部ハウジング（ハウジング）９３，９４と、から構成し、導入管８５の一端を排気管４３に接続するとともに、導入管４３の他端に他端を塞ぐ蓋部材１０７を設け、この蓋部材１０７を上部・下部ハウジング（ハウジング）９３，９４から外界に臨ませたものと言える。   That is, the muffler 40 of the general-purpose engine introduces exhaust gas from the exhaust pipe 43 into the muffler 40 of the general-purpose engine connected to the exhaust port 23 of the engine 10 (see FIG. 1) via the exhaust pipe 43. An introduction pipe 85, silencer chambers 101 to 103 for sending exhaust gas from the introduction pipe 85, discharge pipes (exit pipes) 97 for discharging the exhaust gas from the silencer chambers 101 to 103 to the outside, The upper and lower housings (housings) 93 and 94 that house the introduction pipe 85 and form the silencing chambers 101 to 103 are connected to one end of the introduction pipe 85 to the exhaust pipe 43 and the introduction pipe 43. It can be said that a lid member 107 for closing the other end is provided at the end, and the lid member 107 is exposed to the outside from the upper and lower housings (housings) 93 and 94.

図８は本発明に係る汎用エンジンのマフラの平面図であり、排気管４３は、排気ポート２３（図５参照）に一端を取付けるために、一端に排気管４３の中心を挟んで左右の排気ポート側取付部８３，８３を形成し、且つマフラ４０に他端を連結するために、他端に排気管４３の中心を挟んで左右のマフラ側連結部８４を形成したものであり、マフラ４０は、シリンダヘッド２１側のマフラ支持部８２に取付ける支持ブラケット８１を設けたものである。   FIG. 8 is a plan view of a muffler for a general-purpose engine according to the present invention. The exhaust pipe 43 has left and right exhausts sandwiching the center of the exhaust pipe 43 at one end in order to attach one end to the exhaust port 23 (see FIG. 5). In order to form the port side attachment portions 83 and 83 and to connect the other end to the muffler 40, the left and right muffler side connecting portions 84 are formed at the other end with the center of the exhaust pipe 43 interposed therebetween. Is provided with a support bracket 81 attached to the muffler support portion 82 on the cylinder head 21 side.

従って、マフラ４０は、平面視で、左右の排気ポート側取付部８３，８３及びマフラ支持部８２で支持できるようにしたものであると言え、左右の排気ポート側取付部８３，８３及びマフラ支持部８２を結ぶ三角形の中にマフラ４０の重心Ｇ１を位置させるように、左右の排気ポート側取付部８３，８３及びマフラ支持部８２を配置するようにしたものと言える。これにより、マフラ４０を安定支持することができる。この結果、マフラ４０の振動を低減することができ、マフラ４０から発生する騒音を小さくすることができる。   Therefore, it can be said that the muffler 40 can be supported by the left and right exhaust port side mounting portions 83 and 83 and the muffler support portion 82 in plan view. It can be said that the left and right exhaust port side mounting portions 83 and 83 and the muffler support portion 82 are arranged so that the center of gravity G1 of the muffler 40 is positioned in the triangle connecting the portions 82. Thereby, the muffler 40 can be stably supported. As a result, the vibration of the muffler 40 can be reduced, and the noise generated from the muffler 40 can be reduced.

図９は本発明に係る汎用エンジンのマフラの下の仕切り壁の底面図であり、下の仕切り壁９６は、第１の消音室１０１（図７参照）から第２の消音室１０２に排気ガスを導入するガス孔１２１・・・と、導入管８５を貫通させる貫通孔１２２と、図７に示す第３消音室１０３の下部を形成するとともに排出管（出口管）９７を収納する下膨出部１２３と、排出管（出口管）９７を収納するとともに吸音材９８を収納する下凹部１２４と、を備えたプレートである。なお、図９は下の仕切り壁９６の底面図なので、下膨出部１２３及び下凹部１２４は凸面とし表示されている。   FIG. 9 is a bottom view of the partition wall under the muffler of the general-purpose engine according to the present invention. The lower partition wall 96 is exhaust gas from the first silencing chamber 101 (see FIG. 7) to the second silencing chamber 102. , A through hole 122 through which the introduction pipe 85 penetrates, and a lower bulge that forms the lower part of the third silencing chamber 103 shown in FIG. 7 and accommodates the discharge pipe (exit pipe) 97 It is a plate provided with a portion 123 and a lower recess 124 for housing a discharge pipe (outlet pipe) 97 and a sound absorbing material 98. Since FIG. 9 is a bottom view of the lower partition wall 96, the lower bulging portion 123 and the lower concave portion 124 are displayed as convex surfaces.

図１０は本発明に係る汎用エンジンのマフラの上の仕切り壁の平面図であり、上の仕切り壁９５は、図９に示す下の仕切り壁９６のガス孔１２１・・・を開放（開口）する長手開口１２６及び略角形開口１２７と、図７に示す導入管８５を貫通させる貫通孔１２８の上部を形成するとともに排出管（出口管）９７を収納する上膨出部１２９と、排出管（出口管）９７を収納するとともに吸音材９８を収納する上凹部１３１と、上膨出部１２９の第３の消音室１０３側に開けることで第２の消音室１０２（図７参照）から第３の消音室に排気ガスを導入するガス孔１３２・・・と、を備えたプレートである。   FIG. 10 is a plan view of the upper partition wall of the muffler of the general-purpose engine according to the present invention. The upper partition wall 95 opens (opens) the gas holes 121... Of the lower partition wall 96 shown in FIG. A longitudinal opening 126 and a substantially rectangular opening 127, an upper bulging portion 129 that forms an upper portion of the through-hole 128 that penetrates the introduction pipe 85 shown in FIG. 7 and accommodates a discharge pipe (outlet pipe) 97, and a discharge pipe ( (Outlet pipe) 97 and the upper concave portion 131 for accommodating the sound absorbing material 98 and the third portion from the second silencing chamber 102 (see FIG. 7) by opening the upper bulging portion 129 to the third silencing chamber 103 side. A gas hole 132 for introducing exhaust gas into the noise reduction chamber.

なお、図１０は上の仕切り壁９６の平面図なので、上膨出部１２９及び上凹部１３１は凸面とし表示されている。また、図７に示す第３の消音室１０３は、上膨出部１２９及び下膨出部１２３（図９参照）で構成し、図７に示す吸音材収納部１０４は、上凹部１３１及び下凹部１２４（図９参照）で構成するものである。   In addition, since FIG. 10 is a top view of the upper partition wall 96, the upper bulging part 129 and the upper recessed part 131 are displayed as a convex surface. Further, the third silencing chamber 103 shown in FIG. 7 includes an upper bulging portion 129 and a lower bulging portion 123 (see FIG. 9), and the sound absorbing material storage portion 104 shown in FIG. The concave portion 124 (see FIG. 9) is used.

図１１は本発明に係る汎用エンジンのマフラの正面断面図であり、排出管（出口管）９７は、一端を第３の消音室１０３に当てることで閉鎖するとともに他端（開放口１３５）を外界に開放したパイプであり、第３の消音室１０３から排気ガスを導入するために一端に形成したガス孔群１３３と、吸音材収納部１０４に収納した吸音材（グラスウール）９８に連通させて音のエネルギーの吸収を図るために他端寄りに形成した連通孔群１３４と、を備える。
また、スタッドボルト９１，９１は、補強プレート９９及び下部ハウジング９４に貫通させて下部ハウジング９４外方に突出させたものである。 FIG. 11 is a front sectional view of the muffler of the general-purpose engine according to the present invention. The discharge pipe (exit pipe) 97 is closed by applying one end to the third silencing chamber 103 and the other end (opening port 135). This pipe is open to the outside, and communicates with a gas hole group 133 formed at one end for introducing exhaust gas from the third silencing chamber 103 and a sound absorbing material (glass wool) 98 stored in the sound absorbing material storing portion 104. And a communication hole group 134 formed near the other end in order to absorb sound energy.
The stud bolts 91, 91 are made to penetrate the reinforcing plate 99 and the lower housing 94 and protrude outward from the lower housing 94.

図１２は本発明に係る汎用エンジンのマフラの透視図であり、排気ガスの流れを示す。
排気管４３（図７参照）から導入管開口部（一端）１０６に排気ガスを破線矢印ａ１の如く流入させ、導入管８５に流入した排気ガスを導入管８５の蓋部材（他端）１０７に当てる。 FIG. 12 is a perspective view of the muffler of the general-purpose engine according to the present invention, and shows the flow of exhaust gas.
Exhaust gas is caused to flow from the exhaust pipe 43 (see FIG. 7) into the inlet pipe opening (one end) 106 as indicated by a broken line arrow a1, and the exhaust gas flowing into the inlet pipe 85 is supplied to the lid member (other end) 107 of the inlet pipe 85. Hit it.

このときに、蓋部材１０７は上部ハウジング（ハウジング）９３から外界に臨ませたものなので、蓋部材１０７に排気ガスを当てるときに排気ガスを冷却することができる。この結果、排気ガスの熱エネルギーを低減させることができ、排気音の低減を図ることができる。   At this time, since the lid member 107 faces the outside from the upper housing (housing) 93, the exhaust gas can be cooled when the exhaust gas is applied to the lid member 107. As a result, the thermal energy of the exhaust gas can be reduced, and the exhaust noise can be reduced.

さらに、蓋部材１０７を、上部ハウジング（ハウジング）９３から突出させることで、冷却効果の促進を図ることができる。この結果、さらなる排気ガスの熱エネルギーを低減を図ることができ、さらなる排気音の低減をすることができる。   Further, the cooling effect can be promoted by projecting the lid member 107 from the upper housing (housing) 93. As a result, the thermal energy of the exhaust gas can be further reduced, and the exhaust noise can be further reduced.

予め温度を下げた排気ガスを蓋部材１０７で破線矢印ａ２の如くＵターンさせ、導入管側ガス孔１０８・・・から破線矢印ａ３，ａ３の如く第１の消音室１０１に流入させる。 なお、導入管８５における排気ガスを破線矢印ａ１から矢印ａ２の如く流すために排気管４３（図７参照）に、マフラ４０の導入管８５側近傍にて導入管８５へ同軸に沿わすための屈曲部８６を形成した。   The exhaust gas whose temperature has been lowered in advance is U-turned by the lid member 107 as indicated by a broken line arrow a2, and flows into the first muffler chamber 101 from the introduction pipe side gas holes 108 as indicated by broken line arrows a3 and a3. In order to flow the exhaust gas in the introduction pipe 85 as indicated by the broken arrow a1 to the arrow a2, the exhaust pipe 43 (see FIG. 7) is coaxially connected to the introduction pipe 85 in the vicinity of the introduction pipe 85 side of the muffler 40. A bent portion 86 was formed.

すなわち、導入管８５の中で導入管８５の一端（排気管４３側）から他端に向かわす排気ガスの流れと、他端（蓋部材１０７側）でＵターンさせ一端に向かわす排気ガスの流れとを円滑に作り出すことができる。この結果、さらなる排気ガスの冷却効果を促進することができる。   That is, in the introduction pipe 85, the flow of the exhaust gas directed from one end (exhaust pipe 43 side) to the other end of the introduction pipe 85, and the exhaust gas that is U-turned at the other end (lid member 107 side) and directed to one end. A flow can be created smoothly. As a result, a further exhaust gas cooling effect can be promoted.

第１の消音室１０１で排気ガスを破線矢印ａ４，ａ４及び破線矢印ａ５，ａ５の如く流して消音をした後に、排気ガスをガス孔１２１・・・から矢印ａ６，ａ６及び矢印ａ７，ａ７の如く第２の消音室１０２に流入させる。   After exhausting the exhaust gas in the first silencing chamber 101 as indicated by broken arrows a4 and a4 and broken arrows a5 and a5, the exhaust gas is passed through the gas holes 121... As indicated by arrows a6 and a6 and arrows a7 and a7. As shown in FIG.

次に、第２の消音室１０２から第３の消音室１０３に、排気ガスを矢印ａ８，ａ８及び矢印ａ９，ａ９の如く流入させる。   Next, exhaust gas flows from the second silencing chamber 102 into the third silencing chamber 103 as indicated by arrows a8 and a8 and arrows a9 and a9.

そして、第３の消音室１０３から排出管９７に破線矢印ａ１０，１０の如く流入させ、排出管９７に排気ガスを破線矢印ａ１１の如く流し、連通孔群１３４（図１０参照）から吸音材（グラスウール）９８に破線矢印ａ１２・・・の如く流しつつ（ぶつけつつ）、さらなる消音を図る。そして、十分に冷却及び消音を図った排気ガスを、排出管９７から矢印ａ１３，ａ１３の如く外界に排出する。   Then, the third silencer 103 is caused to flow into the discharge pipe 97 as indicated by broken line arrows a10 and 10, and the exhaust gas is caused to flow into the discharge pipe 97 as indicated by broken line arrows a11. The glass wool 98 is flown as indicated by the broken arrow a12. Then, exhaust gas sufficiently cooled and silenced is discharged from the discharge pipe 97 to the outside as indicated by arrows a13 and a13.

ところで、マフラ４０は、導入管８５を排出管（出口管）９７に対して略直交させたものであり、導入管８５を、排出管（出口管）９７に対して略直交させることで、導入管８５及び排出管（出口管）９７のそれぞれの長さを長く形成することができる。この結果、排気音の低減を図ることができる。   By the way, the muffler 40 is configured such that the introduction pipe 85 is substantially orthogonal to the discharge pipe (exit pipe) 97 and is introduced by making the introduction pipe 85 substantially orthogonal to the discharge pipe (exit pipe) 97. Each of the pipe 85 and the discharge pipe (exit pipe) 97 can be formed long. As a result, exhaust noise can be reduced.

尚、本発明に係る汎用エンジンのマフラは、図４に示すように、マフラ４０及び排気管４３を別体にて構成したが、これに限るものではなく、マフラ側から排気管を延ばしたものであってもよい。
本発明に係る汎用エンジンのマフラは、図７に示すように、上部ハウジング９３から導入管の他端（蓋部材１０７）を外界に臨ませたが、これに限るものではなく、上部ハウジングに導入管の他端（蓋部材）を接合若しくは当接させたものであってもよい。
したものであってもよい。 As shown in FIG. 4, the muffler of the general-purpose engine according to the present invention is configured with the muffler 40 and the exhaust pipe 43 as separate bodies. However, the present invention is not limited to this, and the exhaust pipe is extended from the muffler side. It may be.
As shown in FIG. 7, the muffler of the general-purpose engine according to the present invention has the other end (lid member 107) of the introduction pipe facing the outside from the upper housing 93. However, the present invention is not limited to this, and is introduced into the upper housing. The other end (lid member) of the tube may be joined or abutted.
It may be what you did.

本発明に係る汎用エンジンのマフラは、小型の空冷エンジンや自動車用エンジンに採用するのに好適である。   The general-purpose engine muffler according to the present invention is suitable for use in small air-cooled engines and automobile engines.

本発明に係るマフラを採用した汎用エンジン正面図である。It is a general purpose engine front view which adopted the muffler concerning the present invention. 本発明に係るマフラを採用した汎用エンジン側面図である。1 is a side view of a general-purpose engine that employs a muffler according to the present invention. 本発明に係るマフラを採用した汎用エンジン背面図である。It is a general purpose engine back view which adopted the muffler concerning the present invention. 本発明に係る汎用エンジンのマフラの取付状態を示す側面図である。It is a side view which shows the attachment state of the muffler of the general purpose engine which concerns on this invention. 本発明に係る汎用エンジンのマフラを取付ける排気ポートの平面図である。It is a top view of the exhaust port which attaches the muffler of the general purpose engine which concerns on this invention. 図５の６−６線断面図である。FIG. 6 is a sectional view taken along line 6-6 of FIG. 本発明に係る汎用エンジンのマフラの側面断面図である。It is side surface sectional drawing of the muffler of the general purpose engine which concerns on this invention. 本発明に係る汎用エンジンのマフラの平面図である。It is a top view of the muffler of the general purpose engine which concerns on this invention. 本発明に係る汎用エンジンのマフラの下の仕切り壁の底面図である。It is a bottom view of the partition wall under the muffler of the general purpose engine concerning the present invention. 本発明に係る汎用エンジンのマフラの上の仕切り壁の平面図である。It is a top view of the partition wall on the muffler of the general purpose engine which concerns on this invention. 本発明に係る汎用エンジンのマフラの正面断面図である。It is front sectional drawing of the muffler of the general purpose engine which concerns on this invention. 本発明に係る汎用エンジンのマフラの透視図である。It is a perspective view of the muffler of the general purpose engine which concerns on this invention. 従来の基本構成を説明する図である。It is a figure explaining the conventional basic composition.

符号の説明Explanation of symbols

１０…エンジン、２３…排気ポート、４０…マフラ、４３…排気管、８５…導入管、８６…屈曲部、９３，９４…ハウジング（上部・下部ハウジング）、９７…排出管（出口管）、１０１〜１０３…消音室（第１〜第３の消音室）、１０７…蓋部材。
DESCRIPTION OF SYMBOLS 10 ... Engine, 23 ... Exhaust port, 40 ... Muffler, 43 ... Exhaust pipe, 85 ... Inlet pipe, 86 ... Bending part, 93, 94 ... Housing (upper / lower housing), 97 ... Exhaust pipe (outlet pipe), 101 -10 3 ... Silencer chamber (first to third silencer chambers) 107, a lid member.

Claims (4)

エンジンの排気ポートに排気管を介して接続する汎用エンジンのマフラにおいて、
このマフラは、前記排気管から排気ガスを導入する導入管と、この導入管から排気ガスを送込む消音室と、この消音室から排気ガスを外界に放出する排出管と、これらの排出管及び導入管を収納するとともに前記消音室を形成するハウジングと、からなり、
前記ハウジングは、前記排気管側に形成される下部ハウジングと、この下部ハウジングに被せられる上部ハウジングと、から構成され、
前記下部ハウジングに、前記エンジンを水平状態にしたときの水平面に対して傾斜させた傾斜面が形成され、この傾斜面と前記上部ハウジングとの間に前記導入管が貫通され、
前記導入管の前記傾斜面側を前記排気管に接続するとともに、前記導入管の前記上部ハウジング側を蓋部材で塞ぎ、この蓋部材を前記ハウジングから外界に臨ませたことを特徴とする汎用エンジンのマフラ。 In the muffler of a general-purpose engine connected to the exhaust port of the engine via an exhaust pipe,
The muffler includes an introduction pipe for introducing exhaust gas from the exhaust pipe, a silencer chamber for sending exhaust gas from the introduction pipe, a discharge pipe for discharging exhaust gas from the silencer chamber to the outside, and these discharge pipes and A housing that houses the introduction tube and forms the muffler chamber;
The housing includes a lower housing formed on the exhaust pipe side, and an upper housing that covers the lower housing.
The lower housing is formed with an inclined surface that is inclined with respect to a horizontal plane when the engine is in a horizontal state, and the introduction pipe penetrates between the inclined surface and the upper housing,
A general-purpose engine characterized in that the inclined pipe side of the introduction pipe is connected to the exhaust pipe, the upper housing side of the introduction pipe is closed with a lid member , and the lid member faces the outside from the housing. Muffler. 前記蓋部材を、前記ハウジングから突出させたことを特徴とする請求項１記載に汎用エンジンのマフラ。   The muffler for a general-purpose engine according to claim 1, wherein the lid member protrudes from the housing. 前記排気管は、前記導入管側近傍にて前記導入管へ同軸に沿わすための屈曲部を備えたことを特徴とする請求項１記載に汎用エンジンのマフラ。   2. The muffler for a general-purpose engine according to claim 1, wherein the exhaust pipe includes a bent portion to be coaxial with the introduction pipe in the vicinity of the introduction pipe. 前記導入管は、前記排出管に対して略直交させたことを特徴とする請求項１記載に汎用エンジンのマフラ。   The muffler for a general-purpose engine according to claim 1, wherein the introduction pipe is substantially orthogonal to the discharge pipe.
JP2005182770A 2005-06-23 2005-06-23 General-purpose engine muffler Active JP4489645B2 (en)

Priority Applications (19)

Application Number Priority Date Filing Date Title
JP2005182770A JP4489645B2 (en) 2005-06-23 2005-06-23 General-purpose engine muffler
MYPI20062777A MY149983A (en) 2005-06-23 2006-06-13 Muffler unit for general-purpose engine
MYPI2010003224A MY148994A (en) 2005-06-23 2006-06-13 Muffler unit for general-purpose engine
EP09178550A EP2177727B1 (en) 2005-06-23 2006-06-16 Muffler Unit for General Purpose Engine
CA2607271A CA2607271C (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
CA2807474A CA2807474C (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
ES06767214T ES2396433T3 (en) 2005-06-23 2006-06-16 Silencer unit for general purpose motor
CN200680022435XA CN101203663B (en) 2005-06-23 2006-06-16 Muffler of general-purpose engine
PCT/JP2006/312564 WO2006137506A2 (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
US11/913,144 US7896127B2 (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
ES09178550T ES2374697T3 (en) 2005-06-23 2006-06-16 SILENCER UNIT FOR GENERAL USE MOTOR.
EP06767214A EP1891308B1 (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
TW095121615A TWI359899B (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
KR1020077027735A KR100964592B1 (en) 2005-06-23 2006-06-16 Muffler unit for general-purpose engine
PE2006000706A PE20070258A1 (en) 2005-06-23 2006-06-22 SILENCER UNIT FOR A GENERAL PURPOSE ENGINE
ARP060102694A AR053932A1 (en) 2005-06-23 2006-06-22 SILENCER UNIT FOR GENERAL USE MOTOR
PE2010000981A PE20100831A1 (en) 2005-06-23 2006-06-22 SILENCER UNIT FOR A GENERAL PURPOSE ENGINE
PA20068681601A PA8681601A1 (en) 2005-06-23 2006-06-22 SILENCING UNIT FOR GENERAL PURPOSE MOTOR
CL2008003935A CL2008003935A1 (en) 2005-06-23 2008-12-30 Silencer unit for an engine, comprising a single first fixing point to be connected to the engine body, the first end of the exhaust pipe has a second and a third fixing point, where the fixing points are located in the respective vertices of a triangle (divisional application 1630-06)

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CN105507985B (en) * 2015-12-19 2018-03-23 李家森 Sound attenuation assembly for automobile engine
CN109252949B (en) * 2018-11-07 2024-03-15 河南柴油机重工有限责任公司 Arrangement structure of V-shaped diesel engine muffler

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JPS5960337U (en) * 1982-10-15 1984-04-20 本田技研工業株式会社 Mounting device for silencers in internal combustion engines
JPS6181524A (en) * 1984-09-27 1986-04-25 Honda Motor Co Ltd Vertical crankshaft type internal-combustion engine
US5373119A (en) * 1990-11-23 1994-12-13 Kioritz Corporation Exhaust muffler for internal combustion engine
JPH0861059A (en) * 1994-08-23 1996-03-05 Kubota Corp Muffler of working vehicle
JPH09303133A (en) * 1996-05-13 1997-11-25 Nisshin Kogyo Kk Muffler for engine
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JP2004124883A (en) * 2002-10-04 2004-04-22 Yanmar Co Ltd Resonance prevention structure of engine exhaust silencer

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