JP5840379B2 - Muffler cooling structure of walking-type mobile agricultural machine - Google Patents

Muffler cooling structure of walking-type mobile agricultural machine Download PDF

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JP5840379B2
JP5840379B2 JP2011098076A JP2011098076A JP5840379B2 JP 5840379 B2 JP5840379 B2 JP 5840379B2 JP 2011098076 A JP2011098076 A JP 2011098076A JP 2011098076 A JP2011098076 A JP 2011098076A JP 5840379 B2 JP5840379 B2 JP 5840379B2
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muffler
cooling air
engine
transmission mechanism
air passage
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JP2012228937A (en
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前田 良雄
良雄 前田
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Mitsubishi Mahindra Agricultural Machinery Co Ltd
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Description

本発明は、歩行型管理機などの歩行型移動農機のマフラ冷却構造に関する。   The present invention relates to a muffler cooling structure for a walking-type mobile agricultural machine such as a walking-type management machine.

一般に、歩行型管理機などの歩行型移動農機は、エンジンの排気音を消音するマフラを備えている。マフラは、エンジンの排気ガスが内部に充満し、その外側は高温になるので、通常はマフラカバーで覆われている(例えば、特許文献1参照)。   In general, a walking-type mobile agricultural machine such as a walking-type management machine is provided with a muffler that silences engine exhaust noise. The muffler is usually covered with a muffler cover because the exhaust gas of the engine fills the inside and the outside becomes high temperature (see, for example, Patent Document 1).

特開2007−302139号公報JP 2007-302139 A

しかしながら、外側が高温になるマフラを樹脂製のマフラカバーで覆っている歩行型移動農機では、マフラカバーがマフラの熱で変形したり破損する可能性があった。   However, in the walking type mobile farm machine in which the muffler whose outside is heated is covered with the resin muffler cover, the muffler cover may be deformed or damaged by the heat of the muffler.

本発明は、上記の如き実情に鑑みこれらの課題を解決することを目的として創作されたものであって、冷却ファンを左右方向一側方に備え、冷却風出口を左右方向他側方に備える空冷式のエンジンと、エンジンの動力をミッションケースに伝動するべくエンジンの左右方向他側方に配されていてエンジンの冷却風出口に対して左右方向外側方に対向するベルト伝動機構と、ベルト伝動機構の外側方を覆うベルトカバーと、ベルト伝動機構の上方に配置され、エンジンの排気音を消音するマフラと、マフラの外側方を覆うマフラカバーと、を備える歩行型移動農機において、所定の間隔を存してマフラの上面及び左右側面を覆い、マフラの上面及び左右側面との間に冷却風路を形成する正面視冂字状の冷却風路形成部材と、マフラの下方位置からベルト伝動機構とエンジンとのあいだに位置する状態でエンジンの冷却風出口よりも下方まで延出し上側ほど左右方向外側方に向けて傾斜状に偏倚していて、エンジンの冷却風出口からベルト伝動機構に向けて排出される冷却風をマフラと冷却風路形成部材との間の冷却風路に導く導風部材と、を備え、冷却風路内に導いた冷却風をマフラの前方及び/又は後方から排出させることを特徴とする歩行型移動農機のマフラ冷却構造である。 The present invention has been created in order to solve these problems in view of the above circumstances, and includes a cooling fan on one side in the left-right direction and a cooling air outlet on the other side in the left-right direction. An air-cooled engine, a belt transmission mechanism disposed on the other side in the left-right direction of the engine to transmit the engine power to the transmission case, and opposed to the engine cooling air outlet in the left-right direction, and a belt In a walking type mobile agricultural machine comprising: a belt cover that covers an outer side of the transmission mechanism; a muffler that is disposed above the belt transmission mechanism and that muffles engine exhaust sound; and a muffler cover that covers an outer side of the muffler. A cooling air passage forming member having a cross-sectional shape in front view that covers the upper surface and the left and right side surfaces of the muffler with a gap and forms a cooling air passage between the upper surface and the left and right side surfaces of the muffler, Optionally towards the left-right direction outer side as extending out above to below the cooling air outlet of the engine in a state located between the belt transmission mechanism and the engine biases the inclined, belt transmission mechanism from the cooling air outlet of the engine An air guide member that guides the cooling air discharged toward the cooling air passage to a cooling air passage between the muffler and the cooling air passage forming member, and the cooling air led into the cooling air passage is forward and / or rearward of the muffler. It is a muffler cooling structure of a walk-type mobile agricultural machine characterized by being discharged from the farm.

本発明によれば、エンジンから排出される冷却風を、マフラの周囲に形成した冷却風路に沿って排出することにより、マフラを効率良く冷却し、マフラカバーがマフラの熱で変形したり破損する可能性を低減できる。   According to the present invention, the cooling air discharged from the engine is discharged along the cooling air passage formed around the muffler to efficiently cool the muffler, and the muffler cover is deformed or damaged by the heat of the muffler. The possibility of doing so can be reduced.

歩行型管理機の左側面図である。It is a left view of a walk type management machine. 歩行型管理機の要部左側面図である。It is a principal part left view of a walk type management machine. マフラカバー及びベルトカバーを外した状態を示す歩行型管理機の要部左側面図である。It is a principal part left view of the walking type | mold management machine which shows the state which removed the muffler cover and the belt cover. ベルトカバーを外した状態を示す歩行型管理機の要部正面図である。It is a principal part front view of the walk type management machine which shows the state which removed the belt cover. マフラカバー及びベルトカバーを外した状態を示す歩行型管理機の要部正面図である。It is a principal part front view of the walking type management machine which shows the state which removed the muffler cover and the belt cover. マフラ冷却作用を示す歩行型管理機の要部概略左側面図である。It is a principal part schematic left view of the walk type management machine which shows a muffler cooling effect | action. マフラ冷却作用を示す歩行型管理機の要部概略正面図である。It is a principal part schematic front view of the walk type management machine which shows a muffler cooling effect | action.

以下、本発明の実施の形態について、図面に基づいて説明する。図面において、1は歩行型管理機(歩行型移動農機)であって、該歩行型管理機1は、機体フレームに兼用されるミッションケース2を備えている。ミッションケース2の左右両側方には、車軸(図示せず)を介して車輪3が取り付けられ、ミッションケース2の後方には、ロータリ式の耕耘部4が構成され、ミッションケース2の前方には、空冷式のエンジン5が搭載されている。エンジン5の動力は、ベルト伝動機構6を介してミッションケース2に入力され、ミッションケース2内の変速機構で変速された後、車輪3及び耕耘部4に伝動される。そして図5から明らかなように、冷却ファン用のファンケース5aが左右方向一側方に備えられ、図6に示される冷却風出口5cが、図5において同封部材16が設けられる側、つまりファンケース5aが設けられるとは反対側の左右方向他方側に設けられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a walking type management machine (walking type mobile farm machine), and the walking type management machine 1 includes a mission case 2 that is also used as a body frame. Wheels 3 are attached to the left and right sides of the mission case 2 via axles (not shown). A rotary tiller 4 is formed at the rear of the mission case 2. An air-cooled engine 5 is mounted. The power of the engine 5 is input to the transmission case 2 via the belt transmission mechanism 6, and after being shifted by the transmission mechanism in the transmission case 2, is transmitted to the wheels 3 and the tilling unit 4. As is apparent from FIG. 5, a fan case 5a for a cooling fan is provided on one side in the left-right direction, and the cooling air outlet 5c shown in FIG. 6 is on the side where the enclosing member 16 is provided in FIG. The case 5a is provided on the other side in the left-right direction opposite to the case 5a.

ミッションケース2の後部には、後方斜め上方に向かって突出するハンドル7が取り付けられている。ハンドル7には、クラッチ操作レバー8及びスロットル操作レバー9が設けられており、クラッチ操作レバー8の操作に応じて、ベルト伝動機構6に設けられるベルトテンション式のクラッチ機構6aが入り切りされ、スロットル操作レバー9の操作に応じて、エンジン5の回転数が変更されるようになっている。   A handle 7 is attached to the rear part of the mission case 2 so as to protrude rearward and obliquely upward. The handle 7 is provided with a clutch operating lever 8 and a throttle operating lever 9, and a belt tension type clutch mechanism 6 a provided in the belt transmission mechanism 6 is turned on and off in response to the operation of the clutch operating lever 8. The rotational speed of the engine 5 is changed according to the operation of the lever 9.

さらに、ミッションケース2の後部には、後方斜め上方に向かって突出する変速操作レバー10が設けられている。変速操作レバー10は、ミッションケース2内の変速機構を変速操作するための操作具であり、変速操作レバー10の操作に応じて、車輪3及び耕耘部4の駆動速度や回転方向が変速されるようになっている。   Further, a transmission operation lever 10 is provided at the rear of the mission case 2 so as to protrude rearward and obliquely upward. The speed change lever 10 is an operating tool for speed changing the speed change mechanism in the mission case 2, and the driving speed and rotation direction of the wheels 3 and the tillage part 4 are changed according to the operation of the speed change lever 10. It is like that.

エンジン5は、クランク軸部が前側、シリンダ部が後側となるように前低後高状の傾斜姿勢で機体前部に搭載されている。また、クランク軸部の右側部には、リコイルスタータ5aやファンケース5bが設けられており、ファンケース5b内には、冷却風を起風する冷却ファン(図示せず)が内装されている。冷却ファンは、クランク軸の動力で回転駆動され、起風した冷却風は、エンジン5のシリンダ部などを冷却すべく、クランク軸部の冷却風出口5cから排出される。これにより、走行停止状態でも、冷却ファンからの冷却風によってエンジン5を冷却することが可能になる。   The engine 5 is mounted on the front part of the machine body in a leaning posture with a front, rear, and rear height so that the crankshaft part is on the front side and the cylinder part is on the rear side. A recoil starter 5a and a fan case 5b are provided on the right side of the crankshaft, and a cooling fan (not shown) for generating cooling air is provided in the fan case 5b. The cooling fan is rotationally driven by the power of the crankshaft, and the generated cooling air is discharged from the cooling air outlet 5c of the crankshaft to cool the cylinder portion of the engine 5 and the like. As a result, even when the vehicle is stopped, the engine 5 can be cooled by the cooling air from the cooling fan.

図8に示すように、エンジン5の近傍には、エンジン5の排気音を消音するマフラ11が設けられている。本実施形態のマフラ11は、エンジン5の左側上方に設けられており、エンジン5の排気ガスを、導入管11aを介して内部に導入し、前面部の排気管11bから排出する過程で排気音を消音するようになっている。このようなマフラ11は、内部に排気ガスが充満し、その外側は高温になるので、マフラカバー12で覆う必要がある。   As shown in FIG. 8, a muffler 11 that silences the exhaust sound of the engine 5 is provided in the vicinity of the engine 5. The muffler 11 of the present embodiment is provided on the upper left side of the engine 5, and exhaust gas in the process of introducing the exhaust gas of the engine 5 into the inside through the introduction pipe 11a and exhausting it from the exhaust pipe 11b in the front portion. Is supposed to mute. Such a muffler 11 is filled with exhaust gas and becomes hot at the outside, so it must be covered with a muffler cover 12.

本発明の実施形態に係る歩行型管理機1は、機体を覆うカバー類として、上記マフラカバー12の他に、エンジン5の上方を覆うボンネット13や、ベルト伝動機構6の側方を覆うベルトカバー14を備えている。本実施形態のボンネット13は、下方が開口した略半球形状の樹脂製カバーであり、エンジン5の上方を覆う位置に着脱自在又は回動自在(開閉自在)に設けられている。また、ベルトカバー14は、側面視略長円形状の樹脂製カバーであり、ベルト伝動機構6の側方を覆う位置に着脱自在に設けられている。そして、マフラ11は、側面視でボンネット13とベルトカバー14との間に配置され、その側方がマフラカバー12で覆われるようになっている。   The walking type management machine 1 according to the embodiment of the present invention includes a hood 13 that covers the upper side of the engine 5 and a belt cover that covers the side of the belt transmission mechanism 6 in addition to the muffler cover 12 as covers that cover the machine body. 14 is provided. The bonnet 13 of the present embodiment is a substantially hemispherical resin cover that opens downward, and is detachably or pivotably (openable and closable) provided at a position covering the upper side of the engine 5. The belt cover 14 is a resin cover that is substantially oval in side view, and is detachably provided at a position that covers the side of the belt transmission mechanism 6. The muffler 11 is disposed between the bonnet 13 and the belt cover 14 in a side view, and the side thereof is covered with the muffler cover 12.

マフラカバー12は、側面視略長円形状の樹脂製カバーであり、側面視でベルトカバー14の上側に並列状に配置される。マフラカバー12の成形に用いられる樹脂材料としては、ボンネット13やベルトカバー14の樹脂材料に比べて耐熱温度が高いものが選択されるが、カバー内部にマフラ11の熱がこもると、限界温度を超えてマフラカバー12が熱で変形したり破損する可能性がある。尚、マフラカバー12は、ボンネット13に一体的に取り付けてもよいし、機体に着脱自在に取り付けてもよい。   The muffler cover 12 is a resin cover having a substantially oval shape in a side view, and is arranged in parallel on the upper side of the belt cover 14 in a side view. As the resin material used for molding the muffler cover 12, a material having a higher heat resistance temperature than the resin material of the bonnet 13 or the belt cover 14 is selected. However, if the heat of the muffler 11 is trapped inside the cover, the limit temperature is set. Beyond that, the muffler cover 12 may be deformed or damaged by heat. The muffler cover 12 may be integrally attached to the bonnet 13 or may be detachably attached to the airframe.

マフラカバー12の熱変形や熱破損を防止するために、本発明の実施形態に係る歩行型管理機1は、冷却風路形成部材15と導風部材16を備えている。冷却風路形成部材15は、金属板を曲げ加工して形成される正面視冂字状の部材であり、所定の間隔を存してマフラ11の上面及び左右側面を覆い、マフラ11の上面及び左右側面との間に冷却風路を形成している。   In order to prevent thermal deformation and thermal damage of the muffler cover 12, the walking management machine 1 according to the embodiment of the present invention includes a cooling air passage forming member 15 and an air guide member 16. The cooling air path forming member 15 is a member in a front view shape formed by bending a metal plate, covers the upper surface and the left and right side surfaces of the muffler 11 with a predetermined interval, and the upper surface of the muffler 11 and A cooling air passage is formed between the left and right side surfaces.

導風部材16は、金属板を曲げ加工して形成される正面視逆L字状の部材であり、所定の間隔を存してマフラ11の下面を覆い、マフラ11の下面との間に冷却風路を形成する冷却風路形成部16aと、冷却風路形成部16aの機体中心側端部からベルト伝動機構6の内側方に向けて傾斜状に延出する導風部16bとを備えている。しかも導風部材16は、図5から明らかなように、ベルト伝動機構6とエンジン5とのあいだに位置し、図6から明らかなように、冷却風出口5cよりも下方まで延出している。 The air guide member 16 is an inverted L-shaped member in front view formed by bending a metal plate, covers the lower surface of the muffler 11 with a predetermined interval, and cools between the lower surface of the muffler 11. A cooling air passage forming portion 16a that forms an air passage, and an air guide portion 16b that extends from the end of the cooling air passage forming portion 16a toward the inner side of the belt transmission mechanism 6 in an inclined manner. Yes. Moreover, the air guide member 16 is located between the belt transmission mechanism 6 and the engine 5 as is apparent from FIG. 5, and extends downward from the cooling air outlet 5c as is apparent from FIG.

導風部16bは、エンジン5の冷却風出口5cからベルト伝動機構6に向けて排出される冷却風をマフラ11と冷却風路形成部材15との間の冷却風路に導くことができる。換言すれば、エンジン5の冷却風出口5cからベルト伝動機構6に向けて排出される冷却風をマフラ11と冷却風路形成部材15との間の冷却風路に導くように導風部16bの傾斜が設定されている。そして、冷却風路内に導かれた冷却風は、マフラ11の表面に沿って流れ、マフラ11の前方及び後方(冷却風路形成部材15の前部開口及び後部開口)から排出される。   The air guide portion 16 b can guide the cooling air discharged from the cooling air outlet 5 c of the engine 5 toward the belt transmission mechanism 6 to the cooling air passage between the muffler 11 and the cooling air passage forming member 15. In other words, the cooling air outlet 16c of the engine 5 discharges the cooling air toward the belt transmission mechanism 6 to the cooling air passage between the muffler 11 and the cooling air passage forming member 15, so that the air guide portion 16b. The slope is set. Then, the cooling air introduced into the cooling air passage flows along the surface of the muffler 11 and is discharged from the front and rear of the muffler 11 (the front opening and the rear opening of the cooling air passage forming member 15).

このようにすると、エンジン5から排出される冷却風を利用してマフラ11を効率良く冷却できるので、マフラカバー12がマフラ11の熱で変形したり破損する可能性を低減できる。しかも、導風部材16の導風部16bは、ベルト伝動機構6の内側方を覆うように配置されるので、機体の右側から機体内部に手を入れた際に、ベルト伝動機構6との接触を防ぐ保護カバーとして機能するので、専用の保護カバーを別途設ける場合に比べてコストダウンが図れるという利点がある。   If it does in this way, since the muffler 11 can be efficiently cooled using the cooling air discharged from the engine 5, the possibility that the muffler cover 12 is deformed or damaged by the heat of the muffler 11 can be reduced. In addition, since the air guide portion 16b of the air guide member 16 is arranged so as to cover the inner side of the belt transmission mechanism 6, contact with the belt transmission mechanism 6 when the hand is put into the body from the right side of the body. Since it functions as a protective cover for preventing the above, there is an advantage that the cost can be reduced as compared with a case where a dedicated protective cover is separately provided.

叙述の如く構成されたものにおいて、冷却ファンを備える空冷式のエンジン5と、エンジン5の動力をミッションケース2に伝動するベルト伝動機構6と、ベルト伝動機構6の外側方を覆うベルトカバー14と、ベルト伝動機構6の上方に配置され、エンジン5の排気音を消音するマフラ11と、マフラ11の外側方を覆うマフラカバー12と、を備える歩行型管理機1において、所定の間隔を存してマフラ11の上面及び左右側面を覆い、マフラ11の上面及び左右側面との間に冷却風路を形成する正面視冂字状の冷却風路形成部材15と、マフラ11の下方位置からベルト伝動機構6の内側方に向けて傾斜状に延出し、エンジン5の冷却風出口5cからベルト伝動機構6に向けて排出される冷却風をマフラ11と冷却風路形成部材15との間の冷却風路に導く導風部材16と、を備え、冷却風路内に導いた冷却風をマフラ11の前方及び/又は後方から排出させるので、エンジン5から排出される冷却風を、マフラ11の周囲に形成した冷却風路に沿って排出することにより、マフラ11を効率良く冷却し、マフラカバー12がマフラ11の熱で変形したり破損する可能性を低減できる。   An air-cooled engine 5 having a cooling fan, a belt transmission mechanism 6 that transmits the power of the engine 5 to the transmission case 2, and a belt cover 14 that covers the outer side of the belt transmission mechanism 6 are configured as described above. In the walking type management machine 1 that is arranged above the belt transmission mechanism 6 and includes a muffler 11 that silences the exhaust sound of the engine 5 and a muffler cover 12 that covers the outer side of the muffler 11, there is a predetermined interval. The cooling air passage forming member 15 that covers the upper surface and the left and right side surfaces of the muffler 11 and forms a cooling air passage between the upper surface and the left and right side surfaces of the muffler 11, and belt transmission from the lower position of the muffler 11 The cooling air extending toward the inside of the mechanism 6 in an inclined manner and discharged from the cooling air outlet 5c of the engine 5 toward the belt transmission mechanism 6 is sent to the muffler 11 and the cooling air path forming member 15. An air guide member 16 that leads to the cooling air passage between them, and the cooling air led into the cooling air passage is discharged from the front and / or rear of the muffler 11, so that the cooling air discharged from the engine 5 is By discharging along the cooling air passage formed around 11, the muffler 11 is efficiently cooled, and the possibility that the muffler cover 12 is deformed or damaged by the heat of the muffler 11 can be reduced.

1 歩行型管理機
5 エンジン
5b ファンケース
5c 冷却風出口
6 ベルト伝動機構
11 マフラ
11a 導入管
11b 排気管
12 マフラカバー
14 ベルトカバー
15 冷却風路形成部材
16 導風部材
16a 冷却風路形成部
16b 導風部
DESCRIPTION OF SYMBOLS 1 Walk type management machine 5 Engine 5b Fan case 5c Cooling air outlet 6 Belt transmission mechanism 11 Muffler 11a Inlet pipe 11b Exhaust pipe 12 Muffler cover 14 Belt cover 15 Cooling air path forming member 16 Air guiding member 16a Cooling air path forming part 16b Kazebe

Claims (1)

冷却ファンを左右方向一側方に備え、冷却風出口を左右方向他側方に備える空冷式のエンジンと、
エンジンの動力をミッションケースに伝動するべくエンジンの左右方向他側方に配されていてエンジンの冷却風出口に対して左右方向外側方に対向するベルト伝動機構と、
ベルト伝動機構の外側方を覆うベルトカバーと、
ベルト伝動機構の上方に配置され、エンジンの排気音を消音するマフラと、
マフラの外側方を覆うマフラカバーと、を備える歩行型移動農機において、
所定の間隔を存してマフラの上面及び左右側面を覆い、マフラの上面及び左右側面との間に冷却風路を形成する正面視冂字状の冷却風路形成部材と、
マフラの下方位置からベルト伝動機構とエンジンとのあいだに位置する状態でエンジンの冷却風出口よりも下方まで延出し上側ほど左右方向外側方に向けて傾斜状に偏倚していて、エンジンの冷却風出口からベルト伝動機構に向けて排出される冷却風をマフラと冷却風路形成部材との間の冷却風路に導く導風部材と、を備え、
冷却風路内に導いた冷却風をマフラの前方及び/又は後方から排出させることを特徴とする歩行型移動農機のマフラ冷却構造。
A cooling fan in the left-right direction one side, the engine air-cooled to Ru with a cooling air outlet in the lateral direction other side,
A belt transmission mechanism that is arranged on the other side in the left-right direction of the engine to transmit the power of the engine to the transmission case and faces the cooling air outlet of the engine in the left-right direction ,
A belt cover covering the outside of the belt transmission mechanism;
A muffler disposed above the belt transmission mechanism to mute the exhaust sound of the engine;
In a walking-type mobile agricultural machine comprising a muffler cover that covers the outside of the muffler,
A cooling air passage forming member having a front view and covering the upper surface and the left and right side surfaces of the muffler with a predetermined interval and forming a cooling air passage between the upper surface and the left and right side surfaces of the muffler;
It is located below the muffler between the belt transmission mechanism and the engine, extends below the cooling air outlet of the engine and is biased in an inclined manner toward the outside in the left-right direction toward the upper side. An air guide member that guides the cooling air discharged from the outlet toward the belt transmission mechanism to the cooling air passage between the muffler and the cooling air passage forming member,
A muffler cooling structure for a walk-type mobile agricultural machine, characterized in that the cooling air guided into the cooling air passage is discharged from the front and / or rear of the muffler.
JP2011098076A 2011-04-26 2011-04-26 Muffler cooling structure of walking-type mobile agricultural machine Expired - Fee Related JP5840379B2 (en)

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Publication number Priority date Publication date Assignee Title
JPS61192922U (en) * 1985-05-25 1986-12-01
JP3218356B2 (en) * 1993-03-31 2001-10-15 ヤンマー農機株式会社 Management machine
JP3186515B2 (en) * 1995-05-31 2001-07-11 三菱農機株式会社 Protective cover for muffler in mobile farm equipment
JP4705514B2 (en) * 2006-05-12 2011-06-22 三菱農機株式会社 Mobile farm machine

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