200831774 九、發明說明： 【發明所屬之技術領域】 、、本發明係關於-種引擎散熱結構，尤指於增加引擎燃燒室附 近汽缸頭及汽缸本體之散熱片厚度之結構。 【先前技術】 按’一般車輛之作動’如機車、全地型車•.等，乃係將外 界導入之轉线和齡為油紐，再將喊輸人引擎燃爆 產生動力，而推紐塞做往復運動，經㈣軸帶動皮帶變速機構 來進行傳動，以達到行進之目的。 而針對車辅引擎運轉時所產生之高溫，因散熱方式不同，大 致可分為氣冷式㈣及水冷式引擎二種，其中，—般氣冷式引擎， 如圖一、二所示，主要係由引擎動力系統以及-通過弓丨擎動力系 統之冷卻風罩顺成，刻擎動力系…包树峰箱i丄、與 曲軸相1 1連結之曲柄轴i 2、架設於曲軸箱工工上之汽缸本體 1 y伸置於、ΓΙ缸本體1 3中之活塞丄4、設於汽缸本體工3上 ^缸頭15，至於冷卻風罩則係由蓋設於引擎動力系統1周緣 紅體1 3與汽缸頭；[5上之導風罩i 6所形成，如箭頭所 厂、且在$風罩1 6較低處形成冷卻風人口 1 6 1、在導風罩1 6之-側形成冷卻風出σ}6 2，又，曲柄軸i 2之輸出端直接 ^動、冷贱扇！ 7㈣，且該冷卻風扇1 7並對應於導風罩1 士之冷部風人口161;當曲柄轴12帶動冷卻風扇17運轉 、、部風將由入口16丄進入，並通過導風罩丄6與汽缸本體 200831774 1 3、4頭χ 5之間的冷卻風通路，使冷卻風將汽紅本體1 3 與頭15上之散熱片丄3丄、丄5丄上的熱量帶走，而達到 冷部π缸體13與汽缸則5之目的，使引擎動力系統丨可在正 常工2溫度運轉，最後冷卻風由出口162排出。 w觸—所不’該汽林體！ 3及汽缸犯5為了增加散 熱之面f貝’會於汽缸本體工3及汽紅頭丄5上設置複數個間隔排 列之=片131、151，其中，當油氣進入燃燒室19後， =火生基1 8點火轉’其舰之氣顏力則會產生推力推動活 土乍上下之往復運動，當活塞14下降時，進氣閥開啟， 引導混合油氣進人_室19缝燒，燃燒後之廢_由排氣闕 迅速排出並經由排氣埠15 3排出至排氣管（财未示出）中； 而當車輛於行進時’冷卻風會沿著汽缸本體13及汽缸頭15四 周流動’並帶走散熱片1 3 1、1 5 U之熱量（即轉熱空氣）， 並由導風罩16之出口16 2排出。 習知藉由於汽缸頭！5及汽缸本體：3之周緣設置散熱片丄 f1、131來予以散熱，由於燃燒室19於引擎中係屬溫度最 高的地方，因此通常位於燃燒室i 9附近之汽紅頭i 5或汽叙本 體13之散熱片151、131之長度較長，而越遠離燃燒室之 散熱片1 5 1、1 3 1則長度越短，藉此來達到引擎散熱之目的， 然而由於燃燒室之溫度是最高❺’因此在汽缸頭15與汽虹本 體13之接合面位置溫度同樣最高，而習知之散熱片丄5丄、工 200831774 31之厚度皆為均勻等厚，因此容易造成汽缸頭15及汽缸本體 13之溫差過大且散熱不均勻，一旦溫差過大即容易產生下列缺 失： 1 ·八缸本體13及汽缸頭15之熱變形率較大，如圖三所 示’由圖式中之熱變形率曲線L可看出，由於該燃燒室19之溫 度相當馬’該汽缸頭15及汽缸本體13接近燃燒室19之熱變 形曲率，係遠大於離燃燒室i 9較遠之熱變形曲率，進而會該處 使產生熱變形，導致元件變形或磨損，嚴重者會影響或活塞14 作動之真圓度差，並與汽缸本體13之間的配合造成卡缸、磨損 汽缸壁，縮短引擎壽命。 2 ·活塞14與活塞環在汽缸本體13内運動，由於汽缸本 體13熱變形不均，導致密封不良刮油性差，造成汽缸本體工3 内之機油消耗。 3 ·增加吹漏氣，且機油會遇熱燃燒揮發，使車輛排出 黑 煙’造成環境污染。 有繁於習知之引擎冷卻機構在使用上具有上述之缺失，而仍 有未臻完善之處，發明人乃憑藉其多年從事相關行業之經驗，針 對叾知引擎冷卻機構作一研究改良，再經過多次的試驗與修正 後，終獲致本發明。 【發明内容】 本發明之主要目的，乃在提供一種引擎散熱結構，其主要係 200831774 於引擎之八缸頭及>%红本體之周緣設有複數個呈間隔設置之散熱 片，其中，該汽缸頭及汽缸本體之散熱片厚度係呈非等厚狀，越 接近燃燒室其散熱片之厚度越大於遠離燃燒室之散熱片厚度，藉 此可降低引擎位於燃燒室附近之熱變形率，以避免引擎汽缸頭及 汽缸本體散熱不均之缺失，進而提昇引擎冷卻散熱之功效，來達 到汽缸頭整體的散熱效果，以避免散熱溫度倘造成機#之變形。 【實施方式】 為使貴審查員能更易於了解本發明之結構及所能達成之功 效，茲配合圖式說明如後： 百先，本發明之引擎散熱結構，主要係由引擎動力系統以及 一通過引擎動力系統之冷卻風罩所組成，此_部份與習知相同， 故不再贅述。 請參閱_所示，本發明之汽_2之周緣做有複數個散 熱片2 1，該汽缸頭2内具有-燃燒t22，散熱片2i係呈間 隔平行湖之方式設置於汽缸頭2之外周緣；該汽缸本體3之周 緣亦設有複數個散熱片31，而汽缸本體3内設有一活塞3 2， 其中，該汽缸頭2及汽缸本體3之散熱片21、3i係呈非等厚 狀’該散熱片2 1、31係呈越接近燃燒室2 2其散熱片2丄Z 31A之厚度越大於遠離燃燒室2 2之散熱片2丄B、3丄b的 厚度，且該散熱片21、31之厚度係呈漸進式之變化。 次請參閱圖五所示，本發明於實施時，係可令汽叙頭2及汽 200831774 缸本體3之散熱片21、31，於接近燃燒室2 2之散熱片21 A、 31A之總數有—半以上係較遠離燃燒室2 2之散熱片2工 B、 31B之厚度為厚。藉由增加散熱片21 A、31A之厚产， 來增加散熱片2 1 A、3 i a之散熱表面積，藉此可令汽缸^ j林體3_近燃燒室2 2之位置能得夠均勻的散熱，今而 提昇汽缸頭2及汽缸本體3整體的散熱效果。 再請參_六所示，本發明於實施時，亦可令汽缸頭2及汽 缸本體3近於雜室2 2之散熱片2 1 A、3 1 At片或前三 片中之任-片散刻21 A、31A之厚度大於較遠離燃燒室2 2之政熱片21B、31B之厚度’藉此來令該汽缸頭2及汽缸 本體3能得夠均勻的散熱。 〜本發明之功效在於’藉由汽红頭2及汽缸本體3於接近燃燒 至2 2之散熱片21 A、31A係大於遠離燃燒室2 2之散熱片 _ 21B、31B的厚度，散熱片2 i A、3 i a之散熱表面積及 熱當量得以增加’而可使及汽缸頭2錢缸本體3之熱變形率變 小，如圖七所示’由圖式中之熱變形率曲線L1可看出，由於汽 紅頭2及汽細本體3於接近燃燒室2 2之散熱片21 a、31 A •之厚度較厚’該汽_2及汽缸本體3接近燃燒室2 2之熱變形 • 醇並無較大之變化’進而可避免汽缸頭2或汽缸本體3產生熱 變形’導致元件變形員，延長引擎壽命；而燃燒室2 2產生 之熱里會由散熱片21 A、31A予以散熱，使接近燃燒室2 2 200831774 之溫度可以較快速冷卻，使狂頭2及汽缸本體3之溫度較為均 勻’而不會鮮形不轉致汽缸與活塞_合不良，進而可減少 汽缸本體3内之機油雜，防止機油遇趣顧發，避免使車辅 排出黑煙，造成魏污染並避免產生增加吹漏氣。 又請參賴人所示’本發實施時，該引擎係可於汽紅頭 2上沿著火星塞2 3周邊設置-冷卻風通道2 4，藉由該冷卻風 通道2 4來令部份之冷卻顺入冷卻風通道2 4内，該冷卻風通 道24設有-冷卻風出口241，且該汽红頭2上設有複數個固 定孔2 5 ’該固定孔2 5可供_元件穿設，以將汽_2鎖固 於汽缸本體3上，其中，該冷卻風出口 2 4 i處之固定孔2 5， 係朝冷卻風出° 2 41之另侧偏移，藉此，可加大該冷卻風出口 2 4 1 ’使冷卻顺過冷卻顺道2 4時，能迅速的將汽缸頭2 的熱量帶 <’令汽_ 2能獲得有效之降溫。 請參閱圖九、十、十一所示，本發明於實施時，係可於引擎 之汽缸頭2及汽缸本體3處罩設-導風罩4，該導風料上且有 -冷卻風出口42 ’罩覆於汽紅頭2進氣痒26側之罩片4a， 開設有供進氣管㈤式中未讀）穿通之進氣穿制3，罩覆於 汽缸I2排氣埠27之罩片〇，開設有供排錄（赋中未示 出）牙I之排氣牙孔4 4。該導風罩4罩覆於汽缸頭2排氣埠.2 7側之罩片4 bJl，並係介於排氣穿孔4 4與冷卻風人口 4工之 間’凸設成具有傾斜面之導風機構5，料風機構5之截面係略 200831774 呈三角形或弧形，導風機構5之傾斜面係由冷卻風入口 4工向排 氣穿孔4 4傾斜，以及’於冷卻風出口 4 2相反側的側罩面4 5 上，凸設成具有傾斜面之第二導風機構6，該第二導風機構6之 截面係略呈三角型或弧形，第二導風機構6之傾斜面係由冷卻風 入口41向後傾斜該第—導風機構6係鄰接於導風機構$，藉 此使第二導風機削與導風機構5略呈_相對應狀設置。 當曲柄軸3 3帶動冷卻風扇3 4運轉時，外界的冷卻風將由 風扇罩4 6之冷卻風人口 4 1進人導風罩相，並通過導風罩4 與汽缸本體3、汽紅頭2之間的散熱片31、21，部分的外界 冷卻風會被導風機構5料，而可直接吹襲汽缸則之排氣料 7 ’進而可使將最高溫處燃燒室2 2旁的職埠2 了之溫度有 效的獲得降低；而藉由第二導風機構6可將冷卻風直接導入汽缸 頭2之冷卻風通道24内，以令引擎較高溫處之汽缸頭2，獲得 較佳之散熱效果，而當引擎汽缸頭2及排氣埠2 7處之高溫獲得 有效的降财，整刻擎藉由熱平衡效應，而可使引擎整體之溫 又^寻有A的降低’而其他的外界冷卻風則可同時將汽叙本體3 與>飞缸頭2上之散熱片3工、2丄上的熱量帶走，而達到冷卻汽 缸本體3與汽缸頭2之目的。 、丁、上所述本發明藉由上述之結構，可提昇引擎冷卻散熱之 功效，來達到汽紅頭整體的散熱效果，以避免散熱溫度不均造成 機件之變形，而可改善習知之缺失’已較習用者增進功效，顯已 200831774 貴 具有新穎性及進步性之要件，爰依法提出發明之申請，祈請 審查委員之詳鑑，惠賜為准予專利之審定，至感德便。 【圖式簡單說明】 圖一係習知氣冷式引擎之示意圖。 圖二係習知氣冷式引擎之局部剖視示意圖。 圖三係習知之汽缸頭及汽缸本體熱變形率示意圖。 圖四係本發明汽缸頭及汽缸本體之示意圖。 圖五係本明另一實施例之示意圖。 圖六係本發明又一實施例之示意圖。 圖七係本發明汽缸頭及汽缸本體熱變形率示意圖。 圖八係本發明汽缸頭冷卻風通道之示意圖。 圖九係本發明導風罩之示意圖。 圖十係本發明冷卻動作示意圖。 圖十一係本發明實施例示意圖。 【主要元件符號說明】 1 2曲柄轴 131散熱片 1 5汽缸頭 15 2進氣埠 1 6導風罩 1 6 2出曰 1引擎動力系統 11曲轴箱 13汽缸本體 1 4活塞 151散熱片 15 3排氣埠 1 6 1入口 12 200831774 1 7冷卻風扇 ' 19燃燒室 _ 2汽缸頭 21散熱片 2 2燃燒室 2 4冷卻風通道 2 5固定孔 2 7排氣璋 • 3汽缸本體 3 1散熱片 3 2活塞 3 4冷卻風扇 4導風罩 4 a、4b罩片 4 2冷卻風出口 44排氣#孔 4 6風扇罩 • 5導風機構 6第二導風機構 L、L1熱變形率曲線 1 8火星塞 21A散熱片 2 3火星塞 2 41冷卻風出口 2 6進氣埠 31A散熱片 3 3曲柄轴 41冷卻風入口 4 3進氣穿孔 4 5侧罩面 13200831774 IX. INSTRUCTIONS: [Technical field to which the invention pertains] The present invention relates to an engine heat dissipation structure, and more particularly to a structure for increasing the thickness of a heat sink of a cylinder head and a cylinder body near an engine combustion chamber. [Prior Art] According to the 'general vehicle's action, such as locomotives, all-terrain vehicles, etc., it is the introduction of the external line and the age of the oil, and then the engine will be ignited to generate power, and the push button The plug is reciprocated and driven by the (four) shaft to drive the belt shifting mechanism to achieve the purpose of travel. For the high temperature generated by the operation of the auxiliary engine, due to different heat dissipation methods, it can be roughly divided into air-cooled (four) and water-cooled engines. Among them, the general air-cooled engine, as shown in Figure 1 and Figure 2, is mainly It is composed of the engine power system and the cooling hood of the 丨 丨 动力 动力 , , , , , , , , , 刻 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 包 丄The upper cylinder body 1 y extends into the cylinder body 13 of the piston 丄 4, is disposed on the cylinder body 3, the cylinder head 15 , and the cooling hood is covered by the engine power system 1 peripheral red body 1 3 and the cylinder head; [5 on the windshield i 6 formed, as the arrow factory, and in the lower part of the windshield 16 6 to form a cooling wind population 161, on the side of the air hood 16 The cooling air exits σ}6 2, and the output end of the crankshaft i 2 is directly moved, and the fan is cooled! 7(4), and the cooling fan 17 corresponds to the cold portion wind population 161 of the air duct 1; when the crank shaft 12 drives the cooling fan 17 to operate, the wind will enter from the inlet 16 and pass through the air duct 丄6 and The cooling air passage between the cylinder body 200831774 1 3 and 4 head χ 5 causes the cooling air to take away the heat on the steam red body 1 3 and the heat sinks 3丄, 丄5丄 on the head 15 to reach the cold part. The purpose of the π cylinder 13 and the cylinder 5 is such that the engine power system 运转 can be operated at the normal temperature 2, and finally the cooling air is discharged from the outlet 162. w Touch - not the 'steam body! 3 and the cylinder commits 5 in order to increase the heat dissipation surface f will be placed on the cylinder body 3 and the steam red head 丄 5 on a plurality of intervals arranged by the slices 131, 151, wherein when the oil and gas enters the combustion chamber 19, = fire Base 1 8 ignition turn 'the air force of its ship will generate thrust to push the reciprocating motion of the live soil. When the piston 14 descends, the intake valve opens, guiding the mixed oil and gas into the _ room 19 to sew, after burning The waste_ is quickly exhausted by the exhaust port and discharged to the exhaust pipe (not shown) via the exhaust port 15 3; and the cooling air flows along the cylinder body 13 and the cylinder head 15 while the vehicle is traveling. The heat of the fins 1 3 1 , 1 5 U (i.e., the hot air) is taken away and discharged through the outlet 16 2 of the air duct 16 . Known by the cylinder head! 5 and the cylinder body: the periphery of the 3 is provided with fins 丄f1, 131 for heat dissipation. Since the combustion chamber 19 is the highest temperature in the engine, the steam head i 5 or the steam body is usually located near the combustion chamber i 9 . The length of the fins 151, 131 of the 13 is longer, and the fins 1 5 1 and 1 3 1 farther away from the combustion chamber are shorter in length, thereby achieving the purpose of heat dissipation of the engine, but since the temperature of the combustion chamber is the highest. Therefore, the temperature of the joint surface between the cylinder head 15 and the steam-fluid body 13 is also the highest, and the thicknesses of the conventional heat sinks 丄5丄 and gong 200831774 31 are uniform and equal, so that the cylinder head 15 and the cylinder body 13 are easily caused. If the temperature difference is too large and the heat dissipation is not uniform, the following defects are likely to occur if the temperature difference is too large: 1 · The thermal deformation rate of the eight-cylinder body 13 and the cylinder head 15 is large, as shown in Figure 3, 'the thermal deformation rate curve L in the figure can be It can be seen that since the temperature of the combustion chamber 19 is equivalent to the thermal deformation curvature of the cylinder head 15 and the cylinder body 13 close to the combustion chamber 19, it is much larger than the thermal deformation curvature far from the combustion chamber i9, and thus will be made there. Thermal deformation The component is deformed or worn. In severe cases, the true roundness difference of the piston 14 is affected, and the cooperation with the cylinder body 13 causes the cylinder to be worn and the cylinder wall to wear, shortening the engine life. 2. The piston 14 and the piston ring move in the cylinder body 13, and the thermal deformation of the cylinder body 13 is uneven, resulting in poor sealing and oily performance, resulting in oil consumption in the cylinder body 3 . 3 · Increase the blow-by gas, and the oil will be volatilized by heat, causing the vehicle to emit black smoke, causing environmental pollution. There are some well-known engine cooling mechanisms that have the above-mentioned shortcomings in use, and there are still unsatisfactory improvements. The inventors have made research and improvement on the cooling mechanism of the engine by virtue of their years of experience in related industries. After many trials and corrections, the invention was finally obtained. SUMMARY OF THE INVENTION The main object of the present invention is to provide an engine heat dissipation structure, which is mainly provided with a plurality of spaced-apart heat sinks on the periphery of an engine's eight-cylinder head and a >% red body, in 200831774, wherein The thickness of the fins of the cylinder head and the cylinder body is unequal thickness. The closer to the combustion chamber, the greater the thickness of the fins is than the thickness of the fins away from the combustion chamber, thereby reducing the thermal deformation rate of the engine near the combustion chamber. Avoid the lack of uneven heat dissipation of the engine cylinder head and the cylinder body, thereby improving the cooling and cooling effect of the engine to achieve the overall heat dissipation effect of the cylinder head, so as to avoid the deformation of the machine caused by the heat dissipation temperature. [Embodiment] In order to make it easier for the examiner to understand the structure of the present invention and the achievable effects, the following description is given with reference to the following: The first embodiment of the engine heat dissipation structure of the present invention is mainly composed of an engine power system and a It consists of a cooling hood of the engine power system. This part is the same as the prior art and will not be described again. Referring to _, the periphery of the steam 2 of the present invention has a plurality of fins 2 1, the cylinder head 2 has a combustion t22, and the fins 2i are disposed outside the cylinder head 2 in a manner of a parallel parallel lake. The periphery of the cylinder body 3 is also provided with a plurality of fins 31, and a piston 3 2 is disposed in the cylinder body 3, wherein the fins 21 and 3i of the cylinder head 2 and the cylinder body 3 are non-equal thickness. The fins 2 1 and 31 are closer to the combustion chamber 2 2, and the thickness of the fins 2丄Z 31A is larger than the thickness of the fins 2丄B, 3丄b away from the combustion chamber 2 2 , and the fins 21 The thickness of 31 is a gradual change. Referring to FIG. 5, the present invention can be used to make the heat sinks 21 and 31 of the steam head 2 and the steam of the 200831774 cylinder body 3, and the total number of the heat sinks 21 A and 31A close to the combustion chamber 2 2 . - The thickness of the heat sink 2, B, 31B, which is more than half of the distance from the combustion chamber 2, is thick. By increasing the heat dissipation of the fins 21 A, 31A, the heat dissipating surface area of the fins 2 1 A, 3 ia is increased, whereby the position of the cylinder body 3_ near the combustion chamber 2 2 can be made uniform. The heat dissipation improves the heat dissipation effect of the cylinder head 2 and the cylinder body 3 as a whole. In addition, as shown in FIG. 6 , in the implementation of the present invention, the cylinder head 2 and the cylinder body 3 can also be close to the heat sink 2 1 A, 3 1 At or any of the first three slices of the cavity 2 2 . The thickness of the swarf 21 A, 31A is greater than the thickness of the politic heat sheets 21B, 31B farther from the combustion chamber 2, thereby enabling the cylinder head 2 and the cylinder body 3 to dissipate heat uniformly. The effect of the present invention is that the heat sinks 21 A, 31A which are near the combustion to 22 by the steam red head 2 and the cylinder body 3 are larger than the thickness of the heat sinks _ 21B, 31B far from the combustion chamber 2 2 , the heat sink 2 The heat dissipation surface area and thermal equivalent of i A and 3 ia can be increased, and the thermal deformation rate of the cylinder head 2 can be made smaller, as shown in Fig. 7 'see the thermal deformation rate curve L1 in the figure. Out, because the steam red head 2 and the steam thin body 3 are close to the heat sink 21 a, 31 A of the combustion chamber 2 2, the thickness is thicker, and the steam and the cylinder body 3 are close to the heat distortion of the combustion chamber 2 2 There is no major change 'and thus avoiding thermal deformation of the cylinder head 2 or the cylinder body 3', resulting in a component deformer, extending the life of the engine; and the heat generated by the combustion chamber 22 is dissipated by the heat sinks 21 A, 31A, so that The temperature close to the combustion chamber 2 2 200831774 can be cooled relatively quickly, so that the temperature of the mad head 2 and the cylinder body 3 is relatively uniform, and the cylinder and the piston are not properly combined, thereby reducing the oil in the cylinder body 3. Miscellaneous, to prevent the oil from getting into the fun, to avoid making the car auxiliary black smoke, making Wei contamination and avoid blow-by gas increases. Also, please refer to the person's display. In the implementation of this issue, the engine can be placed on the steam red head 2 along the periphery of the spark plug 2 3 - the cooling air passage 24, and the cooling air passage 24 is used to make part of it. The cooling air passage is provided in the cooling air passage 24, the cooling air passage 24 is provided with a cooling air outlet 241, and the steam red head 2 is provided with a plurality of fixing holes 2 5 '. To fix the steam 2 to the cylinder body 3, wherein the fixing hole 2 5 at the cooling air outlet 2 4 i is offset toward the other side of the cooling air outlet 22, thereby increasing When the cooling air outlet 2 4 1 'cools down the cooling channel 24, the heat of the cylinder head 2 can be quickly brought to 'effectively cool down'. Referring to Figures 9, 10, and 11, the present invention is implemented in the cylinder head 2 and the cylinder body 3 of the engine - an air hood 4 is provided, and the air guiding material has a cooling air outlet 42' covers the cover piece 4a on the side of the gas-inducing 26 of the steam red head 2, and is provided with an air intake through hole 3 for the air intake tube (5) unread), and covers the cover piece of the exhaust port 27 of the cylinder I2. 〇, there is an exhaust hole 44 for the recording of the tooth I (not shown). The air hood 4 covers the cover piece 4 bJ1 on the exhaust side of the cylinder head 2, and is disposed between the exhaust perforation 44 and the cooling air population. The wind mechanism 5, the section of the air-winding mechanism 5 is slightly triangular or curved in 200831774, and the inclined surface of the air guiding mechanism 5 is inclined by the cooling air inlet 4 to the exhaust perforation 44, and 'the opposite of the cooling air outlet 4 2 On the side cover surface 45 of the side, a second air guiding mechanism 6 having an inclined surface is protruded, and the cross section of the second air guiding mechanism 6 is slightly triangular or curved, and the inclined surface of the second air guiding mechanism 6 The first air guiding mechanism 6 is inclined rearwardly from the cooling air inlet 41 to be adjacent to the air guiding mechanism $, whereby the second air guiding device is disposed in a slightly corresponding manner with the air guiding mechanism 5. When the crankshaft 3 3 drives the cooling fan 34 to operate, the external cooling wind will enter the windshield phase by the cooling wind population 4 1 of the fan cover 46, and pass through the air guiding hood 4 and the cylinder body 3, the steam red head 2 Between the heat sinks 31, 21, part of the external cooling wind will be blown by the air guiding mechanism 5, and the exhaust material 7' can be directly blown into the cylinder, thereby enabling the job 2 next to the combustion chamber 2 2 at the highest temperature. The temperature is effectively reduced, and the cooling air can be directly introduced into the cooling air passage 24 of the cylinder head 2 by the second air guiding mechanism 6, so that the cylinder head 2 at a higher temperature of the engine can obtain better heat dissipation effect. When the high temperature of the cylinder head 2 and the exhaust enthalpy of the engine is effectively reduced, the engine can be cooled by the heat balance effect, and the overall temperature of the engine can be lowered by A. Other external cooling winds At the same time, the heat on the heat sink 3 and the heat sink 3 on the flywheel body 3 and the flywheel head 2 can be taken away to achieve the purpose of cooling the cylinder body 3 and the cylinder head 2. According to the above structure, the invention can improve the cooling and heat dissipation effect of the engine, thereby achieving the overall heat dissipation effect of the steam red head, thereby avoiding deformation of the mechanical parts caused by uneven heat dissipation temperature, and improving the lack of conventional knowledge. It has improved the efficacy of the applicants. It has already become a novelty and progressive element of 200831774. It has filed an application for invention according to law, and prayed for the examination of the members. The gift is granted for the examination of patents. [Simple diagram of the diagram] Figure 1 is a schematic diagram of a conventional air-cooled engine. Figure 2 is a partial cross-sectional view of a conventional air-cooled engine. Figure 3 is a schematic diagram showing the thermal deformation rate of the cylinder head and cylinder body. Figure 4 is a schematic view of the cylinder head and cylinder body of the present invention. Figure 5 is a schematic view of another embodiment of the present invention. Figure 6 is a schematic view of still another embodiment of the present invention. Figure 7 is a schematic view showing the heat deformation rate of the cylinder head and the cylinder body of the present invention. Figure 8 is a schematic view of the cylinder head cooling air passage of the present invention. Figure 9 is a schematic view of the air deflector of the present invention. Figure 10 is a schematic diagram of the cooling action of the present invention. Figure 11 is a schematic view of an embodiment of the present invention. [Main component symbol description] 1 2 crankshaft 131 heat sink 1 5 cylinder head 15 2 intake 埠 1 6 air hood 1 6 2 output 引擎 1 engine power system 11 crankcase 13 cylinder body 1 4 piston 151 heat sink 15 3 Exhaust 埠1 6 1 inlet 12 200831774 1 7 cooling fan '19 combustion chamber _ 2 cylinder head 21 heat sink 2 2 combustion chamber 2 4 cooling air passage 2 5 fixing hole 2 7 exhaust 璋 • 3 cylinder body 3 1 heat sink 3 2 piston 3 4 cooling fan 4 air duct 4 a, 4b cover 4 2 cooling air outlet 44 exhaust # hole 4 6 fan cover • 5 air guiding mechanism 6 second air guiding mechanism L, L1 thermal deformation rate curve 1 8 Mars plug 21A heat sink 2 3 Mars plug 2 41 cooling air outlet 2 6 air intake 埠 31A heat sink 3 3 crank shaft 41 cooling air inlet 4 3 air intake perforation 4 5 side cover 13