JP2003129840A - Muffler thermal insulation construction in engine - Google Patents
Muffler thermal insulation construction in engineInfo
- Publication number
- JP2003129840A JP2003129840A JP2001322502A JP2001322502A JP2003129840A JP 2003129840 A JP2003129840 A JP 2003129840A JP 2001322502 A JP2001322502 A JP 2001322502A JP 2001322502 A JP2001322502 A JP 2001322502A JP 2003129840 A JP2003129840 A JP 2003129840A
- Authority
- JP
- Japan
- Prior art keywords
- muffler
- shroud
- engine
- cover
- locking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Exhaust Silencers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、例えば刈払機や清
掃用ブロワのような携帯型作業機の動力源として用いら
れる小型汎用エンジンのマフラ遮熱構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler heat shield structure for a small general-purpose engine used as a power source for a portable work machine such as a brush cutter or a cleaning blower.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】この種の
エンジンは、空冷用の冷却ファンを備えるとともに、複
数の放熱孔を有するシュラウドでマフラの周囲が覆われ
ており、そのシュラウドは軽量化および遮熱のために一
般的に樹脂製とされている。ところが、このようなマフ
ラ放熱構造では、エンジン運転中は前記冷却ファンによ
りある程度冷却されているが、エンジンが停止すると冷
却ファンも停止して空冷効果がなくなるので、この停止
直後にマフラの温度が上昇して、シュラウドの上部の温
度が上昇する。特に、マフラ内に触媒が入っている場合
は、温度上昇が顕著になる。そこで、マフラの遮熱対策
として、遮熱用カバーをボルト・ナットにより直接マフ
ラに取り付けることが考えられる。2. Description of the Related Art An engine of this type is equipped with a cooling fan for air cooling, and a shroud having a plurality of heat radiation holes covers the periphery of a muffler. It is generally made of resin for heat shielding. However, in such a muffler heat dissipation structure, while the engine is operating, it is cooled to some extent by the cooling fan, but when the engine stops, the cooling fan also stops and the air cooling effect disappears, so the temperature of the muffler rises immediately after this stop. Then, the temperature of the upper part of the shroud rises. Especially when the catalyst is contained in the muffler, the temperature rise becomes remarkable. Therefore, as a heat shield measure for the muffler, it is possible to attach the heat shield cover directly to the muffler with bolts and nuts.
【０００３】しかし、上記した遮熱対策では、マフラに
取り付けられた遮熱用カバーにマフラの熱が熱伝導によ
って伝わって、遮熱用カバー自身が加熱されるので、シ
ュラウドの温度上昇の抑制にさほど有効とはいえない。However, in the above heat shield measures, the heat of the muffler is transferred to the heat shield cover attached to the muffler by heat conduction and the heat shield cover itself is heated, so that the temperature rise of the shroud is suppressed. Not very effective.
【０００４】本発明は、以上の事情に鑑みてなされたも
ので、マフラの熱がシュラウドに及ぶのを低減できるエ
ンジンのマフラ遮熱構造を提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a muffler heat shield structure for an engine that can reduce the heat of the muffler from reaching the shroud.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、本発明に係るエンジンのマフラ遮熱構造は、エンジ
ンの少なくともマフラを覆うシュラウドに、前記シュラ
ウドの内側に位置してマフラの上面を覆うマフラカバー
が、マフラとの間に隙間を有して取り付けられている。In order to achieve the above object, a muffler heat shield structure for an engine according to the present invention has a shroud that covers at least the muffler of the engine, and has an upper surface of the muffler located inside the shroud. A muffler cover for covering is attached with a gap between the muffler cover and the muffler.
【０００６】前記エンジンのマフラ遮熱構造によれば、
マフラの熱がマフラカバーで遮熱されると共に、マフラ
からマフラカバー１４への直接的な熱伝導が無いので、
高い遮熱効果が得られ、マフラの熱でシュラウド上壁が
温度上昇するのを抑制することができる。According to the muffler heat shield structure of the engine,
Since the heat of the muffler is shielded by the muffler cover and there is no direct heat conduction from the muffler to the muffler cover 14,
A high heat shield effect is obtained, and it is possible to suppress the temperature rise of the shroud upper wall due to the heat of the muffler.
【０００７】本発明の好ましい実施形態では、前記マフ
ラカバーの両端の係止部が前記シュラウドに設けた係止
孔に係止されている。In a preferred embodiment of the present invention, locking portions at both ends of the muffler cover are locked in locking holes provided in the shroud.
【０００８】このように構成した場合には、取付け用の
ボルト・ナットが不要になるから、少ない部品点数によ
り容易にマフラカバー１４を取り付けることができるの
で、重量増を抑制でき、コストも低減することができ
る。With this structure, the bolts and nuts for mounting are unnecessary, so that the muffler cover 14 can be easily mounted with a small number of parts, so that the weight increase can be suppressed and the cost can be reduced. be able to.
【０００９】本発明の好ましい実施形態では、前記マフ
ラカバーの一端の係止部が係止される係止孔として、前
記シュラウドの上壁に貫通して形成された放熱孔を利用
している。In a preferred embodiment of the present invention, a heat dissipation hole formed through the upper wall of the shroud is used as a locking hole for locking the locking portion at one end of the muffler cover.
【００１０】このように構成した場合には、係止のため
の特別な加工をシュラウドに施す必要がなく、この点で
もコストをより低減できる。With this structure, it is not necessary to perform special processing for locking the shroud, and the cost can be further reduced in this respect.
【００１１】本発明の好ましい実施形態では、前記シュ
ラウドの上壁と側壁に前記マフラカバーの一端と他端の
係止部をそれぞれ係止させる係止孔が設けられ、少なく
とも前記他端の係止部が前記係止孔にほぼ水平方向に侵
入して係止される円弧部を有している。In a preferred embodiment of the present invention, locking holes for locking the locking portions at one end and the other end of the muffler cover are provided on the upper wall and the side wall of the shroud, and at least the locking at the other end. The portion has an arcuate portion which enters the locking hole in a substantially horizontal direction and is locked.
【００１２】このように構成した場合には、簡単な円弧
部によって係止部が形成されるので、加工が容易にな
る。ここで、円弧部は、水平方向に係止孔に侵入して係
止されるので、マフラカバーに作用する重力によって係
止孔から下方に抜け出ることはなく、安定して係止孔に
係止される。また、円弧部は高い強度を持つので、この
点からも、マフラカバーが安定してシュラウドに保持さ
れる。In the case of such a construction, the engaging portion is formed by a simple arcuate portion, which facilitates the processing. Here, since the arc portion horizontally enters the locking hole and is locked, it does not come out of the locking hole downward due to gravity acting on the muffler cover, and is stably locked in the locking hole. To be done. Further, since the circular arc portion has high strength, the muffler cover is stably held on the shroud from this point as well.
【００１３】本発明の好ましい実施形態では、前記マフ
ラとエンジン本体との間を遮断する遮熱板に、前記マフ
ラカバーとマフラの上面の隙間にエンジンの冷却ファン
からの冷却空気を導入する空気導入用の切欠部が形成さ
れている。In a preferred embodiment of the present invention, an air introduction plate for introducing cooling air from an engine cooling fan into a gap between the muffler cover and the upper surface of the muffler is provided on a heat shield plate which isolates the muffler from the engine body. Is formed with a notch.
【００１４】このように構成した場合には、冷却ファン
からの冷却空気をマフラカバーとマフラの上面の隙間に
導入できるので、マフラおよびマフラカバーが冷却空気
で冷却され、エンジン運動中のマフラの冷却効果が向上
する。With this structure, the cooling air from the cooling fan can be introduced into the gap between the muffler cover and the upper surface of the muffler, so that the muffler and the muffler cover are cooled by the cooling air, and the muffler is cooled during engine operation. The effect is improved.
【００１５】[0015]
【発明の実施の形態】以下、本発明の好ましい実施形態
について図面を参照しながら詳述する。図１および図２
は本発明のマフラ遮熱構造を備える刈払機の動力源とし
て用いられる小型汎用エンジンを後方および上方から見
た一部破断背面図および平面図である。これら両図にお
いて、エンジン本体１は、クランクケース２の上方にシ
リンダ３を設けてなり、クランクケース２には前後方向
に延びるクランク軸２１が回転自在に支持されている。
前記シリンダ３の後側から見て左側方にはキャブレタ４
およびエアクリーナ５が、右側方には本発明のマフラ遮
熱構造を備えた金属製のマフラ６が、それぞれ配置され
ている。マフラ６には排気ガスを再燃焼させて浄化する
触媒が内蔵されている。また、前記シリンダ３の頂部に
は点火プラグ７が設けられ、前記クランクケース２の下
部には燃料タンク８が設けられている。前記シリンダ３
およびマフラ６は、樹脂製のシュラウド３０により覆わ
れている。Preferred embodiments of the present invention will be described in detail below with reference to the drawings. 1 and 2
FIG. 2A is a partially cutaway rear view and a plan view of a small general-purpose engine used as a power source of a brush cutter having the muffler heat shield structure of the present invention, as viewed from the rear and from above. In both of these drawings, the engine body 1 is provided with a cylinder 3 above a crankcase 2, and a crankshaft 21 extending in the front-rear direction is rotatably supported by the crankcase 2.
The carburetor 4 is on the left side when viewed from the rear side of the cylinder 3.
The air cleaner 5 and the metal muffler 6 having the muffler heat shield structure of the present invention are arranged on the right side. The muffler 6 has a built-in catalyst for reburning the exhaust gas to purify it. An ignition plug 7 is provided on the top of the cylinder 3, and a fuel tank 8 is provided on the lower part of the crankcase 2. The cylinder 3
The muffler 6 is covered with a resin shroud 30.
【００１６】また、図２の平面図で示すように、前記ク
ランクケース２の後部には、エンジン始動用のリコイル
スタータを収納したリコイルスタータケース９が、前部
には、先端にカッタが連結される回転伝達軸の基端をエ
ンジンに連結する連結部を覆う連結部ハウジング１０が
それぞれ設けられ、さらにクランクケースの前端に形成
されたファンケース２０内には、クランク軸２１に固定
されて回転し冷却空気を生成する冷却ファン１１が設け
られている。冷却空気ＣＡはシリンダ３に送られて、こ
れを冷却したのち、一部はシュラウド３０の後部から外
部へ排出され、他部はマフラ６に送られてこれを冷却し
たのち、外部に排出される。図１に示すシリンダ３とマ
フラ６との間に介挿されるガスケット１２は、マフラ６
とエンジン本体１との間を遮熱する遮熱板に兼用されて
いる。このガスケット１２と、シュラウド３０の上壁に
形成されて下方に延びる仕切壁１３とで、マフラ６とエ
ンジン本体１との間が仕切られている。As shown in the plan view of FIG. 2, a recoil starter case 9 accommodating a recoil starter for starting the engine is connected to the rear portion of the crankcase 2, and a cutter is connected to the front portion of the front portion. Connecting housings 10 are provided to cover the connecting portions that connect the base ends of the rotation transmitting shafts to the engine. Further, the fan housings 20 formed at the front ends of the crankcases are fixed to the crankshafts 21 to rotate. A cooling fan 11 that produces cooling air is provided. The cooling air CA is sent to the cylinder 3 to cool it, then a part thereof is discharged from the rear part of the shroud 30 to the outside, and the other part is sent to the muffler 6 to cool it and then discharged to the outside. . The gasket 12 inserted between the cylinder 3 and the muffler 6 shown in FIG.
It is also used as a heat shield plate that shields heat between the engine body 1 and the engine body 1. The muffler 6 and the engine body 1 are partitioned by the gasket 12 and a partition wall 13 formed on the upper wall of the shroud 30 and extending downward.
【００１７】前記シュラウド３０のうち、マフラ６を覆
う部分３０Ａには、その部分を破断して示す図３のよう
に、シュラウド３０の内側に位置してマフラ６の上面を
覆う金属製のマフラカバー１４が、マフラ６の上面との
間に隙間を有して取り付けられている。図４（Ａ），
（Ｂ），（Ｃ）は、そのマフラカバー１４の平面図、後
方から見た背面図、および図４（Ｂ）の矢印Ｐ方向から
見た側面図をそれぞれ示す。マフラカバー１４における
シリンダ３寄りの一端部は上側に円弧状に折り曲げて、
この折り曲げ部１４ａの端縁に、係止部となる複数の係
止爪１４ｂが形成されている。また、マフラカバー１４
の他端部は下側に折り曲げて、断面が円弧状の円弧部１
４ｃからなる係止部とされている。A portion 30A of the shroud 30 that covers the muffler 6 is a metal muffler cover that is located inside the shroud 30 and covers the upper surface of the muffler 6, as shown in FIG. 14 are attached with a gap between them and the upper surface of the muffler 6. FIG. 4 (A),
4B and 4C respectively show a plan view of the muffler cover 14, a rear view of the muffler cover 14, and a side view of the muffler cover 14 viewed from the direction of arrow P in FIG. 4B. One end of the muffler cover 14 near the cylinder 3 is bent upward in an arc shape,
A plurality of locking claws 14b serving as locking portions are formed on the edge of the bent portion 14a. Also, the muffler cover 14
The other end of the arc is bent downward to form an arc section 1 with an arc section.
4c is a locking portion.
【００１８】図２に示すように、シュラウド３０におけ
るマフラ被覆部３０Ａの上壁には、この上壁を貫通して
左右方向に延びるスリット状放熱孔１５が前後方向に並
んで複数形成され、図５に示すように、前記マフラ被覆
部３０Ａの側壁には、この側壁を貫通して前後方向に延
びるスリット状放熱孔１６が上下に並んで複数形成され
ている。図３に示すマフラカバー１４は、円弧状の折り
曲げ部１４ａが仕切壁１３に当てつけられ、一端の係止
爪１４ｂが、スリット状放熱孔１５の端縁に係止され、
マフラカバー１４の他端の円弧部１４ｃは、スリット状
放熱孔１６の一つにシュラウド３０の内方から押し込ま
れてほぼ水平方向に侵入することにより係止されてい
る。As shown in FIG. 2, in the upper wall of the muffler covering portion 30A of the shroud 30, a plurality of slit-shaped heat dissipation holes 15 penetrating the upper wall and extending in the left-right direction are formed side by side in the front-rear direction. As shown in FIG. 5, on the side wall of the muffler covering portion 30A, a plurality of slit-shaped heat dissipation holes 16 penetrating the side wall and extending in the front-rear direction are formed vertically side by side. In the muffler cover 14 shown in FIG. 3, the arc-shaped bent portion 14a is abutted against the partition wall 13, the locking claw 14b at one end is locked at the edge of the slit-shaped heat dissipation hole 15,
The arcuate portion 14c at the other end of the muffler cover 14 is locked by being pushed into one of the slit-shaped heat dissipation holes 16 from the inside of the shroud 30 and entering in a substantially horizontal direction.
【００１９】マフラカバー１４の係止爪１４ｂは、図４
（Ｂ）に示すように斜め上方に延びており、これを図３
の二点鎖線で示すように前記放熱孔１５に差し込むだけ
でも、係止爪１４ｂに連続する円弧部１４ａの弾性変形
により、放熱孔１５からシュラウド３０の外方に係止爪
１４ｂを突出させるような付勢力がマフラカバー１４に
働いて、係止爪１４ｂを放熱孔１５に係止させることが
できる。ここでは、係止をより強固にするために、図３
の実線（図４（Ｂ）の鎖線）で示すように、係止爪１４
ｂを折り曲げて放熱孔１５の縁部を抱持する状態で係止
させている。また、マフラカバー１４の他端の円弧部１
４ｃは、前記係止爪１４ｂを前記放熱孔１５に係止させ
た状態で、図４（Ｂ）に鎖線で示すように、マフラカバ
ー１４の円弧部１４ｃ側を放熱孔１６から離反する側に
弾性変形させてから図３の放熱孔１６に嵌め込むことに
より、放熱孔１６に係止させる。これにより、円弧部１
４ｃが放熱孔１６から外方に突出する側にマフラカバー
１４の復元力が働くので、円弧部１４ｃを放熱孔１６に
強固に係止させることができる。The locking claw 14b of the muffler cover 14 is shown in FIG.
As shown in (B), it extends obliquely upward, and this is shown in FIG.
As shown by the chain double-dashed line, the locking claw 14b can be projected from the heat dissipation hole 15 to the outside of the shroud 30 by elastically deforming the circular arc portion 14a which is continuous with the locking claw 14b. Such a biasing force acts on the muffler cover 14 to lock the locking claws 14 b in the heat dissipation holes 15. Here, in order to make the locking stronger, FIG.
As shown by the solid line (the chain line in FIG. 4B), the locking claw 14
B is bent and locked so as to hold the edge of the heat dissipation hole 15. In addition, the circular arc portion 1 at the other end of the muffler cover 14
4c is a state in which the locking claw 14b is locked in the heat dissipation hole 15, and the arc portion 14c side of the muffler cover 14 is separated from the heat dissipation hole 16 as shown by a chain line in FIG. 4 (B). It is elastically deformed and then fitted into the heat radiation hole 16 of FIG. As a result, the arc portion 1
Since the restoring force of the muffler cover 14 acts on the side where 4c projects outward from the heat dissipation hole 16, the arc portion 14c can be firmly locked to the heat dissipation hole 16.
【００２０】シリンダ３とマフラ６との間に介挿される
遮熱板兼用のガスケット１２の上端には、図６に斜視図
で示すように、空気導入用の切欠部１２ａが形成されて
いる。この切欠部１２ａを通って図３の前記マフラカバ
ー１４とマフラ６との間の隙間に前記冷却ファン１１
（図２）からの冷却空気ＣＡが導入されて、マフラ６お
よびマフラカバー１４が冷却される。As shown in a perspective view in FIG. 6, a notch 12a for introducing air is formed at the upper end of the gasket 12 which also serves as a heat shield plate and is inserted between the cylinder 3 and the muffler 6. The cooling fan 11 is inserted through the notch 12a into the gap between the muffler cover 14 and the muffler 6 shown in FIG.
Cooling air CA from (FIG. 2) is introduced to cool the muffler 6 and the muffler cover 14.
【００２１】上記構成のマフラ遮熱構造によると、エン
ジンが停止して図２の冷却ファン１１からの冷却空気Ｃ
Ａが停止しても、図３のマフラ６の上面を覆うマフラカ
バー１４が、マフラ６との間に隙間を有するようにシュ
ラウド３０の内側に位置して、シュラウド３０に取り付
けられているから、マフラ６の熱がマフラカバー１４で
遮熱される一方で、マフラ６からマフラカバー１４への
直接的な熱伝導が無くなるので、高い遮熱効果が得ら
れ、マフラ６の熱でシュラウド３０が高温化するのを防
止することができる。According to the muffler heat shield structure having the above construction, the engine is stopped and the cooling air C from the cooling fan 11 shown in FIG.
Even if A is stopped, the muffler cover 14 that covers the upper surface of the muffler 6 in FIG. 3 is attached to the shroud 30 because it is located inside the shroud 30 so that there is a gap between the muffler 6 and the muffler cover 14. While the heat of the muffler 6 is shielded by the muffler cover 14, there is no direct heat conduction from the muffler 6 to the muffler cover 14, so a high heat shield effect is obtained, and the heat of the muffler 6 raises the temperature of the shroud 30. Can be prevented.
【００２２】また、シュラウド３０の放熱孔１５，１６
を係止孔として、これら放熱孔１５，１６にマフラカバ
ー１４の両端の係止部を係止させているので、取付け用
の部品なしで簡単にマフラカバー１４をシュラウド３０
に取り付けることができ、重量増を招くことがなく、コ
ストも低減できる。特に、マフラカバー１４の一端に形
成された係止爪１４ａをシュラウド３０の上壁の放熱孔
１５に係止させ、他端に形成された円弧部１４ｃをシュ
ラウド３０の側壁の放熱孔１６に係止させることによ
り、マフラカバー１４をシュラウド３０に取り付けてい
るので、係止のための特別な加工をシュラウド３０に施
す必要がなく、この点でも製造コストをより低減でき
る。また、マフラカバー１４の他端の係止部は円弧部１
４ｃであるから、高い強度を持つので、シュラウド３０
に安定して係止される。また、マフラカバー１４の弾性
変形を利用してマフラカバー１４をシュラウド３０に取
り付けているので、同じマフラカバー１４を、幅方向
（図３の左右方向）の寸法の異なるシュラウド３０を持
つエンジンにも、弾性変形量を適切に設定することで使
用可能であり、汎用性が高まる。Further, the heat dissipation holes 15 and 16 of the shroud 30.
As the locking holes, the locking portions at both ends of the muffler cover 14 are locked to the heat dissipation holes 15 and 16. Therefore, the muffler cover 14 can be easily attached to the shroud 30 without any mounting parts.
It can be attached to the base plate, the weight is not increased, and the cost can be reduced. In particular, the locking claw 14a formed at one end of the muffler cover 14 is engaged with the heat dissipation hole 15 on the upper wall of the shroud 30, and the arcuate portion 14c formed at the other end is engaged with the heat dissipation hole 16 on the side wall of the shroud 30. Since the muffler cover 14 is attached to the shroud 30 by stopping, it is not necessary to perform a special process for locking the shroud 30, and the manufacturing cost can be further reduced in this respect as well. Further, the locking portion at the other end of the muffler cover 14 is the arc portion 1
Since it is 4c, it has high strength, so shroud 30
It is stably locked to. Further, since the muffler cover 14 is attached to the shroud 30 by utilizing the elastic deformation of the muffler cover 14, the same muffler cover 14 can be applied to an engine having a shroud 30 having different dimensions in the width direction (left and right direction in FIG. 3). It can be used by appropriately setting the elastic deformation amount, and versatility is enhanced.
【００２３】さらに、図６のガスケット（遮熱板）１２
の切欠部１２ａにより、図２の冷却ファン１１からの冷
却空気を図３のマフラカバー１４とマフラ６の上面との
隙間に導入できるので、マフラ６およびマフラカバー１
４が冷却空気で冷却される。その結果、マフラ６の遮熱
効果がさらに向上する。Further, the gasket (heat shield) 12 shown in FIG.
2 can introduce the cooling air from the cooling fan 11 of FIG. 2 into the gap between the muffler cover 14 of FIG. 3 and the upper surface of the muffler 6, and thus the muffler 6 and the muffler cover 1 of FIG.
4 is cooled with cooling air. As a result, the heat shield effect of the muffler 6 is further improved.
【００２４】なお、触媒の無いマフラ６の場合には、エ
ンジン停止後のマフラ６からの放熱量はさほど大きくな
いので、前記マフラカバー１４を省略して、シュラウド
３０の放熱孔１５，１６からマフラ６の熱を逃がすよう
にすることができる。In the case of the muffler 6 without a catalyst, since the amount of heat radiation from the muffler 6 after the engine is stopped is not so large, the muffler cover 14 is omitted, and the muffler from the heat radiation holes 15 and 16 of the shroud 30 is omitted. The heat of 6 can be made to escape.
【００２５】図６は、本発明の他の実施形態に係るマフ
ラ遮熱構造を備えたエンジンの要部を示す一部破断背面
図である。この実施形態では、先の実施形態におけるマ
フラカバー１４をビス１７，１８によりシュラウド３０
に取り付けたものである。すなわち、金属製のマフラカ
バー１４の一端部および他端部にバーリング加工により
ねじ孔２５，２６を形成し、シュラウド３０の上壁に設
けたねじ挿通孔２７にシュラウド３０の外側から貫通さ
せたビス１７を、一端部のねじ孔２５に螺合させ、シュ
ラウド３０の側壁に設けたねじ挿通孔２８にシュラウド
３０の外側から貫通させたビス１８を、他端部のねじ孔
２６に螺合させることにより、マフラカバー１５をシュ
ラウド３０の内面に取り付けている。その他の構成は先
の実施形態の場合と同様であり、ここではその説明を省
略する。FIG. 6 is a partially cutaway rear view showing an essential part of an engine having a muffler heat shield structure according to another embodiment of the present invention. In this embodiment, the muffler cover 14 in the previous embodiment is shrouded 30 with screws 17 and 18.
It is attached to. That is, screw holes 25 and 26 are formed in one end and the other end of the metallic muffler cover 14 by burring, and a screw insertion hole 27 formed in the upper wall of the shroud 30 is penetrated from the outside of the shroud 30 with screws. Screwing 17 into a screw hole 25 at one end, and screwing a screw 18 through a screw insertion hole 28 provided in the side wall of the shroud 30 from the outside of the shroud 30 into a screw hole 26 at the other end. Thus, the muffler cover 15 is attached to the inner surface of the shroud 30. The other configurations are the same as those in the previous embodiment, and the description thereof is omitted here.
【００２６】この実施形態の場合にも、比較的容易にマ
フラカバー１４を組付けできると共に、マフラ６の熱で
シュラウド３０が高温化するのを防止することができ
る。Also in the case of this embodiment, the muffler cover 14 can be assembled relatively easily, and the heat of the muffler 6 can be prevented from raising the temperature of the shroud 30.
【００２７】なお、前記各実施形態において、シュラウ
ド３０はシリンダ３とマフラ６の両方を覆う一体物とし
たが、シリンダ３とマフラ６を別個に覆う２つの部品で
構成してもよい。In each of the above embodiments, the shroud 30 is an integral body that covers both the cylinder 3 and the muffler 6, but it may be composed of two parts that separately cover the cylinder 3 and the muffler 6.
【００２８】[0028]
【発明の効果】以上のように、本発明のエンジンのマフ
ラ遮熱構造によれば、エンジンの少なくともマフラを覆
うシュラウドに、前記シュラウドの内側に位置してマフ
ラの上面を覆うマフラカバーが、マフラとの間に隙間を
有して取り付けられているから、マフラの熱がマフラカ
バーで遮熱される一方で、マフラからマフラカバーへの
直接的な熱伝導が無くなるので、高い遮熱効果が得ら
れ、マフラの熱でシュラウドが高温化するのを防止する
ことができる。As described above, according to the muffler heat shield structure for an engine of the present invention, the muffler cover, which is located inside the shroud and covers the upper surface of the muffler, is disposed on the shroud that covers at least the muffler of the engine. Since there is a gap between the muffler and the muffler heat is shielded by the muffler cover, there is no direct heat conduction from the muffler to the muffler cover, so a high heat shield effect can be obtained. It is possible to prevent the shroud from becoming hot due to the heat of the muffler.
【図１】本発明の一実施形態に係るマフラ遮熱構造を備
えた小型汎用エンジンを示す背面図である。FIG. 1 is a rear view showing a small general-purpose engine provided with a muffler heat shield structure according to an embodiment of the present invention.
【図２】同エンジンの平面図である。FIG. 2 is a plan view of the engine.
【図３】同エンジンのマフラ部分を示す一部破断した背
面図である。FIG. 3 is a partially cutaway rear view showing a muffler portion of the engine.
【図４】（Ａ）は同エンジンにおけるマフラカバーの平
面図、（Ｂ）は同マフラカバーの背面図、（Ｃ）は同マ
フラカバーの側面図である。4A is a plan view of a muffler cover in the engine, FIG. 4B is a rear view of the muffler cover, and FIG. 4C is a side view of the muffler cover.
【図５】前記エンジンにおけるシュラウドの側面図であ
る。FIG. 5 is a side view of a shroud of the engine.
【図６】前記マフラ部分のガスケットの変形例を示す斜
視図である。FIG. 6 is a perspective view showing a modified example of the gasket of the muffler portion.
【図７】本発明の他の実施形態に係るマフラ遮熱構造を
備えた小型汎用エンジンのマフラ部分を示す一部破断し
た背面図である。FIG. 7 is a partially cutaway rear view showing a muffler portion of a small general-purpose engine including a muffler heat shield structure according to another embodiment of the present invention.
１…エンジン本体、６…マフラ、１１…冷却ファン、１
２…遮熱板兼用ガスケット、１２ａ…切欠部、１４…マ
フラカバー、１４ｂ…係止爪（一端の係止部）、１４ｃ
…円弧部（他端の係止部）、１５，１６…放熱孔（係止
孔）、３０…シュラウド1 ... Engine body, 6 ... Muffler, 11 ... Cooling fan, 1
2 ... Gasket also serving as heat shield plate, 12a ... Notch portion, 14 ... Muffler cover, 14b ... Locking claw (locking portion at one end), 14c
... Arc part (locking part at the other end), 15, 16 ... Heat dissipation hole (locking hole), 30 ... Shroud
フロントページの続き (72)発明者 山根 芳郎 兵庫県明石市川崎町１番１号 川崎重工業 株式会社明石工場内 Ｆターム(参考） 3G004 AA07 DA07 DA22 EA05 Continued front page (72) Inventor Yoshiro Yamane 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Akashi Factory Co., Ltd. F-term (reference) 3G004 AA07 DA07 DA22 EA05
Claims (5)
ラウドに、前記シュラウドの内側に位置してマフラの上
面を覆うマフラカバーが、マフラとの間に隙間を有して
取り付けられているエンジンのマフラ遮熱構造。1. A muffler heat shield for an engine, wherein a muffler cover, which is located inside the shroud and covers the upper surface of the muffler, is attached to a shroud that covers at least the muffler of the engine with a gap between the muffler and the muffler. Construction.
両端の係止部が前記シュラウドに設けた係止孔に係止さ
れているエンジンのマフラ遮熱構造。2. The muffler heat shield structure for an engine according to claim 1, wherein the engaging portions at both ends of the muffler cover are engaged with engaging holes provided in the shroud.
一端の係止部が係止される係止孔は、前記シュラウドの
上壁に貫通して形成された放熱孔であるエンジンのマフ
ラ遮熱構造。3. The muffler heat shield for an engine according to claim 2, wherein the locking hole for locking the locking portion at one end of the muffler cover is a heat dissipation hole formed through the upper wall of the shroud. Construction.
壁と側壁に前記マフラカバーの一端と他端の係止部をそ
れぞれ係止させる係止孔が設けられ、少なくとも前記他
端の係止部が前記係止孔にほぼ水平方向に侵入して係止
される円弧部を有しているエンジンのマフラ遮熱構造。4. A locking hole according to claim 2, wherein a locking hole for locking one end and one end of the muffler cover is provided in the upper wall and the side wall of the shroud, and at least the other end of the muffler cover is provided. Is a muffler heat shield structure for an engine, which has an arc portion which is inserted into the locking hole in a substantially horizontal direction and is locked.
記マフラとエンジン本体との間を遮断する遮熱板に、前
記マフラカバーとマフラとの隙間にエンジンの冷却ファ
ンからの冷却空気を導入する空気導入用の切欠部が形成
されているエンジンのマフラ遮熱構造。5. The cooling air from the engine cooling fan is introduced into a gap between the muffler cover and the muffler on a heat shield plate for blocking between the muffler and the engine body according to any one of claims 1 to 4. A muffler heat shield structure for an engine in which a cutout for introducing air is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001322502A JP3621909B2 (en) | 2001-10-19 | 2001-10-19 | Engine muffler insulation structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001322502A JP3621909B2 (en) | 2001-10-19 | 2001-10-19 | Engine muffler insulation structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003129840A true JP2003129840A (en) | 2003-05-08 |
| JP3621909B2 JP3621909B2 (en) | 2005-02-23 |
Family
ID=19139542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001322502A Expired - Fee Related JP3621909B2 (en) | 2001-10-19 | 2001-10-19 | Engine muffler insulation structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3621909B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005337197A (en) * | 2004-05-31 | 2005-12-08 | Ishikawajima Shibaura Mach Co Ltd | Small size engine |
| WO2013042535A1 (en) | 2011-09-21 | 2013-03-28 | Hitachi Koki Co., Ltd. | Engine and engine-operated working machine |
| JP2014047740A (en) * | 2012-08-31 | 2014-03-17 | Hitachi Koki Co Ltd | Engine work machine |
| JP2015108319A (en) * | 2013-12-04 | 2015-06-11 | 日立工機株式会社 | Air-cooled engine and engine work machine |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632826U (en) * | 1986-06-24 | 1988-01-09 | ||
| JPH11324643A (en) * | 1998-05-07 | 1999-11-26 | Honda Motor Co Ltd | Exhaust muffler cooling device for engine |
-
2001
- 2001-10-19 JP JP2001322502A patent/JP3621909B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS632826U (en) * | 1986-06-24 | 1988-01-09 | ||
| JPH11324643A (en) * | 1998-05-07 | 1999-11-26 | Honda Motor Co Ltd | Exhaust muffler cooling device for engine |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005337197A (en) * | 2004-05-31 | 2005-12-08 | Ishikawajima Shibaura Mach Co Ltd | Small size engine |
| WO2013042535A1 (en) | 2011-09-21 | 2013-03-28 | Hitachi Koki Co., Ltd. | Engine and engine-operated working machine |
| JP2013068140A (en) * | 2011-09-21 | 2013-04-18 | Hitachi Koki Co Ltd | Engine and engine working machine |
| CN103748331A (en) * | 2011-09-21 | 2014-04-23 | 日立工机株式会社 | Engine and engine-operated working machine |
| US9140175B2 (en) | 2011-09-21 | 2015-09-22 | Hitachi Koki Co., Ltd. | Engine and engine-operated working machine |
| JP2014047740A (en) * | 2012-08-31 | 2014-03-17 | Hitachi Koki Co Ltd | Engine work machine |
| JP2015108319A (en) * | 2013-12-04 | 2015-06-11 | 日立工機株式会社 | Air-cooled engine and engine work machine |
| WO2015083380A1 (en) * | 2013-12-04 | 2015-06-11 | Hitachi Koki Co., Ltd. | air-cooled engine and engine working MACHINE |
| US20160237876A1 (en) * | 2013-12-04 | 2016-08-18 | Hitachi Koki Co., Ltd. | Air-cooled engine and engine working machine |
| CN106030070A (en) * | 2013-12-04 | 2016-10-12 | 日立工机株式会社 | Air-cooled engine and engine working machine |
| CN106030070B (en) * | 2013-12-04 | 2019-06-21 | 工机控股株式会社 | Air-cooled engine and engine working rig |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3621909B2 (en) | 2005-02-23 |
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