200422513 玖、發明說明： 【發明所屬之技術領域】 本發明係關於一強制氣冷式引擎，該引擎$ ^ 于°又夏有一言蔓 罩，該護罩覆蓋一曲柄軸箱和一汽缸至少其中之_， 點火線圈位於該護罩外面。 【先前技術】 / Η >Ί、 下面專利文獻1中 ▼-,丨"I 手、〈一 種。據揭示之該專利文獻1所稱，該引擎用於一摩耗車中之 一旋轉驅動單元’且該引擎包括··一引擎體，該弓丨擎體2 有一曲柄軸箱，該曲柄軸箱支撐一曲柄軸，該引擎體還具 有一從該曲柄軸箱延伸之汽缸，一安裝到該汽缸之火星 塞，一與該曲柄軸連接之離心風扇，一護罩，其用於從= 面覆蓋該引擎體、火星塞和風扇且可從該風扇將風導：汽 缸和火星塞，以及一點火線圈，該線圈可供應電流給該火 星塞，其中來自該引擎之驅動力傳向後輪，以使摩托 夠行進。 犯 專利文獻 1 JP-A-Hei 9-126109 【發明内容】 本發明要解決之問題 專利文IU之圖15戈2所描述之引擎中，其點火線圈位於卢 缸凸出方向之前部，所以其引擎之外部尺寸趨大。另外， 由於該點火線圈與火星塞接觸，該火星塞係藉由一螺㈣ 入汽所以該引擎體之振動傾向於直接傳向該點火讀 圈’這會導致該點火線圈之使用期限問題。200422513 发明, Description of the invention: [Technical field to which the invention belongs] The present invention relates to a forced air-cooled engine. The engine has a cover on the side, and the cover covers at least one of the crankcase and a cylinder. Among them, the ignition coil is located outside the shield. [Prior art] / Η > Ί, the following patent document 1 ▼-, 丨 " I hand, <one kind. According to the disclosed Patent Document 1, the engine is used in a rotary drive unit of a friction car, and the engine includes an engine body, the bow 2 and the engine body 2 having a crank shaft box which is supported by the crank shaft box. A crankshaft, the engine block also has a cylinder extending from the crankshaft box, a spark plug mounted to the cylinder, a centrifugal fan connected to the crankshaft, and a shroud for covering the The engine block, the spark plug and the fan, and the wind can be guided from the fan: the cylinder and the spark plug, and an ignition coil that can supply electric current to the spark plug, in which the driving force from the engine is transmitted to the rear wheels to make the motorcycle Enough to march. Patent Document 1 JP-A-Hei 9-126109 [Summary of the Problem] In the engine described in Figure 15 and 2 of Patent Document IU, the ignition coil is located in the front of the cylinder in the protruding direction, so its The external dimensions of the engine are getting larger. In addition, since the ignition coil is in contact with the spark plug, the spark plug is fed into the steam by a screw, so the vibration of the engine body tends to be transmitted directly to the ignition read coil ', which will cause the life of the ignition coil.
O:\91\91117.DOC 200422513 在專利文獻1之圖3或4所示之引擎中，將其點火線圈連接 到一曲柄軸箱之外面。然而，該曲柄軸箱一般比一汽缸具 有一較大之外形尺寸。因故，這種情況下，該引擎之外形 尺寸就趨於變大。另外，由於點火線圈係直接連接到該曲 柄軸箱的，所以，引擎體之振動更直接地傳向該點火線圈， 這就增加了產生該點火線圈使用期限問題之可能性。 解決問題之方案 本發明已考慮這種情況，本發明之一目的係使包括一引 擎體和一火星塞之引擎部件相互定位緊湊以使該引擎變得 較小，並且防止該引擎體之振動傳向該點火線圈，以增加 该點火線圈之使用期限。 本發明之申請專利範圍第1項之強制氣冷式引擎包括：一 引擎體15，該引擎體具有一支撐一曲柄軸17之曲柄軸箱 1 8，該引擎體15還具有一從該曲柄軸箱丨8延伸之汽缸丨9 ; 一與該汽缸19連接之火星塞34 ; —與該曲柄軸17連接之風 扇37 ; —護罩38，其用於從其外部覆蓋該引擎體15、火星 塞34和風扇37且用於將風B從該風扇37導向該汽缸19和火 星塞34 ;以及一用於供應電流給該火星塞34之點火線圈43， 其中’ a亥點火線圈4 3位於該護罩3 8中在徑向方向覆蓋該 汽缸19之外表面之一部分5 5之附近。 申請專利範圍第2項之發明為根據申請專利範圍第丨項之 發明’其中该遵罩3 8具有一導引部分5 6，其從該風扇3 7之 徑向外面附近向著該火星塞34大體成直線地延伸，以將來 自該風扇37之風B導引向該火星塞34，且其中該點火線圈43 O:\91\91117.DOC -9- 200422513 位於該導引部分5 6之外面附近。 申請專利範圍第3項之發明為根據中請專利範圍第！或2 項之發明，其巾點线㈣位於護㈣之上端附近。 申請專利範圍第4項之發明為根據申請專利範圍第】至3 項之任-項之發明’其中護罩38藉由—彈性體Μ由料體 15支撐，並且藉由一電纜49卓 見^運接到火星塞34之點火線圈43 由護罩38支撐。 上述部分中附屬於每-項之參考數字和符號不應當被認 為係將本發明之技術範圍限制於下面所述之[實施 分中内容。 本發明之效果 本發明之效果如下。 根據本發明之申請專利_第1項之發明係一強制氣冷 式引擎，該引擎包括：—引擎體，該引擎體具有—支撐二 曲柄軸之曲柄軸箱，該引擎體還具有—從該曲柄軸箱延伸 之汽缸；一連接至該汽缸之火星塞；一連接到該曲柄軸之風 扇；一護罩，其用於從其外部覆蓋該引擎體、火星塞和風扇 且可用於從該風扇將風導向該汽缸和火星塞；以及一用於 向。亥火星基供應電流之點火線圈， —其中該點火線圈之位置靠近該護罩中在徑向方向覆蓋該 紅之外表面之一部分。 對於該汽缸之徑向尺寸而言，汽缸之外部尺寸一般小於 曲柄軸相之外部尺寸。所以，將該點火線圈設置在於徑向 方向覆蓋該汽缸之外面之護罩中的該部分之外面p付近，藉 O:\91\91U7.doc 200422513 此防止該點火線圈向外延伸過大，並且該引擎體、護罩和 點火線圈能在一緊凑條件下設置。因而，可使該引擎變的 較小。 根據申請專利範圍第2項之發明中，該護罩具有一導引部 刀"亥$引邛分從風扇之徑向外面附近大體成直線地向火 生基延伸，從而將來自風扇之風導向火星塞，且點火線圈 位於該導引部分之外面附近。 假如該導引部分位於該護罩之内側或外側，此與上述一 般成直線地延伸之位置相對比，則來自風扇之風就不大可 能被直線地導向該火星塞，這對於用空氣有效地冷卻該火 生塞就不疋優選的。因此就上述之功能而言，將該導引部 分設計成可滿足該護罩較小之需要，並且傾向於在該護罩 外表面中之凹部。 所以，如上所述，將該點火線圈設置在該導引部分之外 面附近，並且更有把握地防止該點火線圈從該引擎體向外 延伸過多，並且可將該引擎體、護罩和點火線圈在一緊湊 條件下設置。於是，更有把握使該引擎變得較小。 根據申請專利範圍第3項之發明中，該點火線圈位於該護 罩之上面附近。 所以，如果將該引擎用作車輛中一驅動裝置，在該車輛 行進時，該護罩能防止從該車輛之行進面上濺起之泥漿或 水進入該點火線圈，也就是說，該護罩保護了該點火線圈。 根據申請專利範圍第4項之發明中，該護罩藉由一彈性體 由忒引擎體支撐，並且藉由一電纜連接到該火星塞之點火 O:\91\91117.DOC -11 - 200422513 線圈由該護罩支樓。 所以，虽该引擎體之振動向該點火線圈之方向傳輸時， 該振動藉由該彈性體和電、€分別具有之緩衝仙吸收。所 以’阻止3亥引擎體之振動傳向該點火線圈H更可增加該 點火線圈之使用期限。 實現本發明之最佳方式 為了達到本發明之強制氣冷式引擎之目的，亦即，使包 括-引擎體、-火星塞等在㈣引擎部件相互定位緊凑， 以使該引擎變的較小，實施本發明之最佳方式如下。 該取佳方式係，一引擎設置有：一引擎體，該引擎體具 有-支撐-曲柄軸之曲柄軸箱和一從該曲柄軸箱延伸之汽 缸’-安裝到該汽缸之火星塞，一連接到該曲柄軸並與該 曲柄軸互鎖之風扇’-護罩，用於從該引擎體、火星塞和 風扇之外側覆蓋該引擎體、火星塞和風扇且用於從該風扇 將風導向該汽缸和火星塞，以及—點火線圈，1用於供應 電流給該火星塞。該點火線圈之位置靠近在徑向方向覆蓋 該汽缸外表面之護罩中的一部分。 【實施方式】 為了進-步詳細地描述本發明之目的，將參考附圖來描 述其一實施例。 在該等圖中，參考數字i代表-由一小型摩托車實施之鞍 式車輛。圖中的Fr表示該車輛1之行進方向。 該車輛i具有：一車體2叫立於該車體2之前端之前輪3, 該前端由前叉支撐而可以自由地操作，—由位於該車體2 O:\91\91in.DOC •12- 200422513 之後部之-懸掛裝置4支撐之後輪5, 一由該柳之後上部 切之座6,以及-能夠驅動該後輪5之驅動裝置7，其中該 前輪3和後輪5位於該車體2之橫向方向之中心部分，且該車 體2由在該車輛的一行進面8上的該前輪3和後輪$支撐。 該懸掛裝置4包括··-驅動單仙和一振動吸收器12，該 驅動單元設置在該車體2横向中心部分之—側（右側），其前 端由-枢軸9軸向地支撐到該車體2,其後端能夠上下搖擺 並藉由-軸H)來支撐該後輪5,該振動吸收器則係將該驅動 單元U支撐在該車體2上。驅動單元7之__部分由該驅動單 元11構成，且該驅動單元U包括—諸如—内燃機之四衝程 引擎13 ’該引擎13構成該驅動單元^ 一前部，以及一減 速政置14，其δ又置成與该引擎丨3相連且使該後輪5連接到引 擎13。該減速裝置14具有一速度可調之ν型帶減速機構和一 減速齒輪機構，此等在圖中未示出。 口亥引擎13包括-引擎體i 5，該引擎體具有_曲柄轴箱 18,該曲柄軸箱支撐一曲柄軸17以繞一中心軸線“自由旋 轉，該中心軸線16沿該車體2之橫向方向延伸，以及一汽缸 19，該汽缸19從該曲柄軸箱18沿一大體平行之方向向前和 向上延伸，且於該汽缸19之一中心線2〇上方形成一汽缸孔 21 〇 一進口孔24形成在該汽缸19之一延伸端上表面，該進口 孔24使該汽缸19之上外侧與汽缸孔21相通，一作為一燃料 供應I置且與進氣孔24相通之化油器25設置在該引擎體15 之上方附近，並且設置一與該化油器25相通之空氣慮清器 O:\91\91117.DOC •13· 200422513 2 6 〇 ^排氣口28形成在該汽缸以―延伸端下表面，該排氣 ^口 “紅孔21與該汽缸19之下外側相通，並且設置一與 該排氣口 28相通之排氣管29。該排氣管29向下延伸出該^ 缸19之延伸端’經過該引擎體15之底部附近，向後和向上 延伸出該引擎體15。-支架板31由位在該引擎㈣中的該 曲：軸箱18的後側之一對上下緊固件3〇、3〇所支撐，該排 氣管29在縱向之一半部分由該支架板31支撐。 將一桿狀火星塞34連接到該汽缸19之延伸端，將在該火 星塞34之一端之一放電部分35設置在該汽缸孔21之—燃燒 腔中，該火星塞34之另-端從該汽缸19之延伸端向外向前 延伸。 將一離心風扇37設置在該曲柄軸17之一中心線16之上 方，並設置在該曲柄軸箱18之一側附近，並由該曲柄軸” 之一端支撐且繞該中心線16隨該曲柄軸17沿一方向八旋 轉，該一方向Α在引擎體2之侧視圖（圖丨）中成順時鐘方向， 該視圖係從該曲柄軸箱1 8之一側觀看的。 由樹脂製成之一護罩3 8可拆除地從引擎體、火星塞和風 扇之外面分別覆蓋引擎體15、該火星塞34之一端和風扇37 全部，並且可從風扇37將風Β導向汽缸19和該火星塞34之一 端，藉此用空氣冷卻該汽缸和火星塞。該護罩38由緊固件 39可拆開地支撐於引擎體15，並且在曲柄軸17之中心線16 上形成一空氣導引口 40 ’該導引口之外側與該風扇37之中 心部分相通。在該引擎體1 5和面對該引擎體之護罩3 $外側 O:\91\91117.DOC -14 - 200422513 之間設置一彈性體41，該彈性體一般具有密封作用和吸震 作用，且該護罩38藉由該彈性體41由引擎體15支撐。在該 汽缸19之延伸端形成一空氣導引通道42，該導引通道使該 護罩38之内部空間與該汽缸19之底端外側相通，且該空氣 導引通道42相對於該火星塞34而設置成與該風扇37相對。 設置一能夠向該火星塞34供應電流之點火線圈43和平板 支架44，該平板支架使該點火線圈43由該護罩38支撐。該 支架44由一緊固件47分別支撐於一對支撐件45、46，該對 支撐件延伸地形成於該護罩38。該點火線圈43由另一緊固 件48支撐於該平板支架44，並且用一柔性電纜49將該點火 線圈43電連接到該火星塞34之另一端。 為了使該護罩38對該引擎體15等構件的覆蓋係可拆除 的，該護罩38設置有各自分離之第一至第三護罩件51至 53。更明確地說，該護罩38設置有：第一護罩件5丨，該護 罩件從侧可拆地覆蓋該曲柄軸箱1 8和風扇3 7之外部，第 一濩罩件5 2其能夠從一侧可拆式地套合該汽缸丨9之外側以 更可刀開地覆蓋该汽缸i 9之外側，且該第二護罩件之橫截 面從後面看如同一馬蹄形，第三護罩件”其能夠從另二侧 (内側）可拆式地套合該汽缸19之内侧以便覆蓋該汽紅Η之 :側該第三護罩件之橫截面從前面看如同一馬蹄形 地靠Ϊ 第三護罩件51到53之每—相對端可彼此充分 該 定0 第一護罩件51和第 兩支撐件45及46之 二護罩件52由一緊固件54相互固 一支撐件45係在該第二護罩件52上O: \ 91 \ 91117.DOC 200422513 In the engine shown in Fig. 3 or 4 of Patent Document 1, its ignition coil is connected to the outer surface of a crankcase. However, the crankcase generally has a larger outer dimension than a cylinder. For this reason, the external dimensions of the engine tend to become larger in this case. In addition, since the ignition coil is directly connected to the crankcase, the vibration of the engine body is more directly transmitted to the ignition coil, which increases the possibility of causing the life of the ignition coil. Solution to Problem The present invention has considered such a situation, and an object of the present invention is to make the engine parts including an engine block and a spark plug compactly positioned with each other to make the engine smaller, and to prevent vibration transmission of the engine block. To the ignition coil to increase the life of the ignition coil. The forced air-cooled engine of item 1 of the present invention includes: an engine block 15 having a crankshaft box 18 supporting a crankshaft 17; the engine block 15 also having a crankshaft Box 丨 8 extended cylinder 丨 9; a spark plug 34 connected to the cylinder 19;-a fan 37 connected to the crankshaft 17;-a shroud 38 for covering the engine block 15, the spark plug from the outside 34 and a fan 37 for directing wind B from the fan 37 to the cylinder 19 and the spark plug 34; and an ignition coil 43 for supplying an electric current to the spark plug 34, wherein the 'a hai ignition coil 43 is located in the guard The cover 38 covers the vicinity of a portion 55 of the outer surface of the cylinder 19 in the radial direction. The invention according to the second patent application scope is the invention according to the first patent application scope, wherein the compliance cover 3 8 has a guide portion 5 6 which is generally directed toward the Mars plug 34 from the vicinity of the radial outside of the fan 37. It extends in a straight line to guide the wind B from the fan 37 to the spark plug 34, and the ignition coil 43 O: \ 91 \ 91117.DOC -9- 200422513 is located near the outer surface of the guide portion 5 6 . The invention claimed in the scope of patent application No. 3 is based on the patent application scope No.! Or the invention of item 2, the towel dot line is located near the upper end of the guard. The invention in item 4 of the patent application scope is an invention according to any one of the items in the scope of patent application] to 3 in which the shield 38 is supported by the material 15 through the elastomer M, and is seen through a cable 49. The ignition coil 43 connected to the spark plug 34 is supported by a shield 38. The reference numerals and symbols attached to each item in the above section should not be considered as limiting the technical scope of the present invention to the content of the [implementation points] described below. Effects of the present invention The effects of the present invention are as follows. According to the application patent of the present invention_the first invention is a forced air-cooled engine, the engine includes:-an engine body, the engine body has-a crank shaft box supporting two crank shafts, and the engine body also has-from the A cylinder extending from a crankshaft box; a spark plug connected to the cylinder; a fan connected to the crank shaft; a shroud for covering the engine block, the spark plug, and the fan from the outside and for being used from the fan Directs wind to the cylinder and spark plug; and one to direct. The igniting coil supplying the electric current of the helium-based planet, wherein the ignition coil is located near a part of the shield covering the outer surface of the red in a radial direction. For the radial dimension of the cylinder, the outer dimension of the cylinder is generally smaller than the outer dimension of the crankshaft phase. Therefore, the ignition coil is arranged near the outer surface p of the part in the shield covering the outer surface of the cylinder in the radial direction. By using O: \ 91 \ 91U7.doc 200422513, this prevents the ignition coil from extending excessively outward, and the The engine block, shroud and ignition coil can be placed in a compact condition. Therefore, the engine can be made smaller. According to the invention in the scope of the patent application No. 2, the shield has a guide knife " Haiyuan 邛 points extending from the vicinity of the radial outside of the fan to the fire base in a substantially straight line, so that the wind from the fan The spark plug is guided, and the ignition coil is located near the outer surface of the guide portion. If the guide portion is located inside or outside the shroud, which is in contrast to the above-mentioned position that extends generally in a straight line, the wind from the fan is unlikely to be directed straight to the spark plug, which is effective for using air It is not preferable to cool the fire plug. For the above functions, therefore, the guide portion is designed to meet the needs of the shroud being smaller, and tends to be a recess in the outer surface of the shroud. Therefore, as described above, the ignition coil is disposed near the outer surface of the guide portion, and the ignition coil is more surely prevented from extending outward from the engine body, and the engine body, the shroud, and the ignition coil can be prevented. Set in a compact condition. As a result, there is more certainty to make the engine smaller. According to the invention of claim 3, the ignition coil is located near the upper surface of the shield. Therefore, if the engine is used as a driving device in a vehicle, the shield can prevent mud or water splashing from the running surface of the vehicle from entering the ignition coil when the vehicle is traveling, that is, the shield The ignition coil is protected. According to the invention in item 4 of the scope of patent application, the shroud is supported by the plutonium engine body by an elastomer, and is connected to the ignition plug of the spark plug by a cable O: \ 91 \ 91117.DOC -11-200422513 coil Supported by the shroud. Therefore, although the vibration of the engine body is transmitted in the direction of the ignition coil, the vibration is absorbed by the elastic body and the buffering sensations which are separately provided by electricity and electricity. Therefore, 'blocking the vibration of the engine body to the ignition coil H can further increase the life of the ignition coil. The best way to implement the present invention is to achieve the purpose of the forced air-cooled engine of the present invention, that is, to make the engine components including the -engine body, -the spark plug, etc. compact in each other, so that the engine becomes smaller. The best way to implement the present invention is as follows. The preferred method is that an engine is provided with: an engine body having a support-crank shaft crankshaft box and a cylinder extending from the crankshaft box-a spark plug installed to the cylinder, a connection Fan'-shield to the crankshaft and interlocked with the crankshaft, for covering the engine block, the spark plug and the fan from the outside of the engine block, the spark plug and the fan, and for directing wind from the fan to the The cylinder and the spark plug, and-the ignition coil, 1 are used to supply current to the spark plug. The ignition coil is positioned near a portion of a shield covering the outer surface of the cylinder in a radial direction. [Embodiment] In order to further describe the purpose of the present invention in detail, an embodiment thereof will be described with reference to the drawings. In these figures, the reference number i represents a saddle vehicle implemented by a scooter. Fr in the figure indicates the traveling direction of the vehicle 1. The vehicle i has: a vehicle body 2 called a front wheel 3 standing at the front end of the vehicle body 2, the front end is supported by a front fork and can be freely operated, and is located at the vehicle body 2 O: \ 91 \ 91in.DOC • 12- 200422513 rear-suspension device 4 supports rear wheel 5, a seat 6 cut by the rear upper part of the willow, and-driving device 7 capable of driving the rear wheel 5, wherein the front wheel 3 and the rear wheel 5 are located in the vehicle The central part of the body 2 in the lateral direction, and the body 2 is supported by the front wheels 3 and the rear wheels $ on the traveling surface 8 of the vehicle. The suspension device 4 includes a driving single cent and a vibration absorber 12. The driving unit is disposed on one side (right side) of the transverse center portion of the vehicle body 2, and its front end is axially supported by the pivot 9 to the vehicle. The rear end of the body 2 can swing up and down and support the rear wheel 5 through the -axis H), and the vibration absorber supports the driving unit U on the vehicle body 2. The __ part of the drive unit 7 is constituted by the drive unit 11, and the drive unit U includes, for example, a four-stroke engine 13 of an internal combustion engine. The engine 13 constitutes the drive unit ^ a front part, and a speed reduction mechanism 14, which δ is again connected to the engine 3 and the rear wheel 5 is connected to the engine 13. The speed reducing device 14 has a v-shaped belt speed reducing mechanism and a speed reducing gear mechanism, which are not shown in the figure. Kouhai engine 13 includes an engine block i 5 which has a crankshaft box 18 which supports a crankshaft 17 to "freely rotate around a central axis, which central axis 16 is transverse to the body 2 Extending in a direction, and a cylinder 19 extending forward and upward from the crankshaft box 18 in a substantially parallel direction, and forming a cylinder hole 21 and an inlet hole above a center line 20 of the cylinder 19 24 is formed on the upper surface of an extended end of the cylinder 19, and the inlet hole 24 communicates with the cylinder hole 21 above and outside the cylinder 19, and a carburetor 25 is provided as a fuel supply I and communicates with the intake hole 24. An air cleaner O: \ 91 \ 91117.DOC communicating with the carburetor 25 is provided near the upper part of the engine block 15 and an exhaust port 28 is formed in the cylinder to- On the lower surface of the extended end, the exhaust port “red hole 21” communicates with the outer side below the cylinder 19, and an exhaust pipe 29 that communicates with the exhaust port 28 is provided. The exhaust pipe 29 extends downward from the extended end of the cylinder 19 past the bottom of the engine body 15 and extends backward and upward from the engine body 15. -The bracket plate 31 is supported by the song located in the engine yoke: a pair of upper and lower fasteners 30 and 30 on the rear side of the axle box 18, and the exhaust pipe 29 is supported by the bracket plate 31 in one half of the longitudinal direction support. A rod-shaped spark plug 34 is connected to the extended end of the cylinder 19, and a discharge portion 35 at one end of the spark plug 34 is disposed in the combustion cavity of the cylinder hole 21, and the other end of the spark plug 34 is provided from The extended end of the cylinder 19 extends outward and forward. A centrifugal fan 37 is disposed above a center line 16 of the crank shaft 17 and is disposed near one side of the crank shaft box 18 and is supported by one end of the crank shaft 17 and follows the crank around the center line 16 The shaft 17 rotates in eight directions, the direction A is clockwise in the side view (Figure 丨) of the engine block 2, and the view is viewed from one side of the crankshaft case 18. It is made of resin. A shroud 3 8 removably covers the engine body 15, one end of the spark plug 34 and all of the fan 37 from the outside of the engine block, the spark plug, and the fan, and can direct the wind B to the cylinder 19 and the spark plug from the fan 37. 34, thereby cooling the cylinder and the spark plug with air. The shroud 38 is detachably supported by the engine block 15 by a fastener 39, and an air guide port 40 is formed on the center line 16 of the crank shaft 17. 'The outer side of the guide port is in communication with the central part of the fan 37. A space is provided between the engine block 15 and the outer cover 3 $ facing the engine block O: \ 91 \ 91117.DOC -14-200422513 An elastic body 41 which generally has a sealing effect and a shock absorbing effect, and the shield 38 The elastic body 41 is supported by the engine body 15. An air guide passage 42 is formed at the extended end of the cylinder 19, and the guide passage communicates the internal space of the shroud 38 with the outside of the bottom end of the cylinder 19, and The air guide channel 42 is disposed opposite to the fan 37 with respect to the spark plug 34. An ignition coil 43 and a plate support 44 capable of supplying an electric current to the spark plug 34 are provided. The shield 38 is supported. The bracket 44 is supported by a pair of support members 45, 46 respectively by a fastener 47, the pair of support members are extendedly formed on the shield 38. The ignition coil 43 is supported by the other fastener 48 A flat bracket 44 and a flexible cable 49 is used to electrically connect the ignition coil 43 to the other end of the spark plug 34. In order to make the shroud 38 covering the engine block 15 and other components removable, the shroud 38 There are provided separate first to third shroud members 51 to 53. More specifically, the shroud 38 is provided with a first shroud member 5 丨 which covers the crank shaft detachably from the side. Outside the box 18 and the fan 37, the first hood cover 5 2 can be opened from The outer side of the cylinder 9 is detachably fitted on the cylinder 9 to cover the outer side of the cylinder i 9 more detachably, and the cross section of the second shield member looks like the same horseshoe shape from the rear, and the third shield member. It can detachably fit the inner side of the cylinder 19 from the other two sides (inside) so as to cover the side of the steam red: the cross section of the third shroud member looks like a horseshoe from the front. Each of the cover members 51 to 53-the opposite ends can be sufficient with each other. The first cover member 51 and the second support members 45 and 46 bis. The cover member 52 is fastened to each other by a fastener 54 and a support member 45 is attached to the On the second shield member 52
O:\91\91117DOC -15- 200422513 面延伸而形成，並且另一支撐件46在該第三護罩件53上面 延伸而形成。該第二護罩件52和第三護罩件53藉由支架44 相互固定，如上所述，該支架44由各自支撐件45和46支撐。 所以，藉由使用該支架44便能夠以一簡單結構實現該第二 護罩件52和第三護罩件53之固定。 該點火線圈43設置在該護罩38中的一部分55之外面附 近’其中護罩3 8之該部分係沿徑向方向在汽缸外面附近覆 蓋該汽缸19之外面。更明確地，該點火線圈43之至少一部 分設置在該護罩38之第二護罩件52之部分55之外面附近 (外側），其中護罩38之該部分55係沿徑向方向覆蓋該汽缸19 之外面一側之外面。一引導部分56形成在該護罩38之第二 4罩件52之上面’該引導部分從外面附近和該風扇37之徑 向上方大體成直線地延伸到該火星塞3 4之放電部分3 5側， 並且從該風扇37向該火星塞34之一端導引風B，而且使該點 火線圈43之至少一部分設置在該引導部分56之外（上）面附 近。 該護罩38之部分55大體垂直地且前後平均地延伸。該護 罩38之引導部分56在車體2之橫向方向且前後平均地延 伸，並且使該部分55和引導部分56連接和設置得使其相互 垂直，並且將該點火線圈43之至少一部分設置在一凹部57 中，该凹部57形成在該部分55之外面和該引導部分56之外 面之間。 該凹部57位於車輛！之外側，並且開口朝向車輛之外側且 向上。所以，儘管該點火線圈43位於該凹部57中，從該車O: \ 91 \ 91117DOC -15- 200422513 is formed by extending the surface, and another supporting member 46 is formed by extending above the third shield member 53. The second shield member 52 and the third shield member 53 are fixed to each other by a bracket 44. As described above, the bracket 44 is supported by the respective support members 45 and 46. Therefore, by using the bracket 44, the fixing of the second shield member 52 and the third shield member 53 can be realized with a simple structure. The ignition coil 43 is provided near the outer surface of a part 55 of the shroud 38, wherein the part of the shroud 38 covers the outer surface of the cylinder 19 in the radial direction near the outer surface of the cylinder. More specifically, at least a part of the ignition coil 43 is disposed near the outer surface (outside) of the part 55 of the second shroud member 52 of the shroud 38, wherein the part 55 of the shroud 38 covers the cylinder in a radial direction. 19 Outer side. A guide portion 56 is formed above the second 4 cover member 52 of the shroud 38. The guide portion extends substantially straight from the vicinity of the outer side and the radial upward direction of the fan 37 to the discharge portion 3 of the spark plug 34. Side, and directs wind B from the fan 37 to one end of the spark plug 34, and at least a part of the ignition coil 43 is provided near the upper (outer) surface of the guide portion 56. The portion 55 of the shroud 38 extends substantially vertically and evenly back and forth. The guide portion 56 of the shroud 38 extends evenly in the lateral direction of the vehicle body 2 and forward and backward, and the portion 55 and the guide portion 56 are connected and arranged so that they are perpendicular to each other, and at least a part of the ignition coil 43 is provided at In a recessed portion 57, the recessed portion 57 is formed between an outer surface of the portion 55 and an outer surface of the guide portion 56. This recess 57 is located in the vehicle! Outside, with the opening facing the vehicle outside and up. Therefore, although the ignition coil 43 is located in the recess 57,
O:\91\91117.DOC -16- 200422513 輛1外側之一 之維護。 寬大空間 就能夠容易地完成對該點火線圈43 鏈之張緊#作部分6〇延伸且 該鏈用於將位於該汽缸19 :缸19之上面， 該曲柄軸17。在今第-罐^伸^之一動力閱機構連接到 …一 件53之上面形成-凹槽61，操 作邛为60可安裝在該凹槽61 ^ ,. T 並且§將该第三護罩件53 女I入/拆離開該汽缸19之 八…- 側時，该凹槽61防止該操作部 刀60對㈣三護罩件53形成阻滞而得以順利安裝。 一由橡膠板製成之-柔性隔絕材⑽和凹槽_置在化 ，和，氣渡清器26之下方，該柔性隔絕材料62覆蓋引 體15和4罩38之每—上面。該隔絕材料62藉由使用支架 44保持在特疋位置。也就是說，該隔絕材料_由該支 架44用壓力壓合在 在蔓罩38之上面，從而藉由利用支架44 使ίΓ持在—特定位置。所以’藉由利用該支架44能夠用 一簡單之結構完成對該隔絕材料62之保持。 田驅動引擎13 %，該引擎丨3之驅動力藉由減速裝置i惰 輸給後輪5,因此車輛丨能夠行進。隨著引擎13之驅動，風 扇3 7¼曲柄軸17沿一方向a旋轉，且使來自該風扇37之風b 向A缸19和火星塞34，從而能夠用空氣使它們得以冷 卻。特別地，風B係藉由該護罩38之引導部分56強制地導向 該火星塞34的，所以火星塞34由空氣有效地冷卻。用空氣 對該汽缸19和該火星塞34冷卻後，風b流過該空氣導引通道 42 ’並被排出該汽缸丨9下面之外部。當驅動該引擎丨3時， 該護罩38及隔絕材料62防止該化油器25及空氣濾清器26藉 O:\91\91117.DOC -17- 200422513 由該引擎13之引擎體15產生之熱量加熱。該隔絕材料62還 可防止風B由該凹槽61洩露出該護罩38。 根據上述之結構，將該點火線圈43設置在該護罩38在徑 向方向覆蓋該汽缸19外表面之部分55的外面附近。 在圖中所示之實施例中，在該汽缸19之徑向方向上，該 汽缸19之外部尺寸小於該曲柄軸箱18之外部尺寸。所以， 將該點火線圈43設置在該護罩38中的部分55之外面附近， 该濩罩38在徑向方向上覆蓋該汽缸19之外面，藉此防止該 點火線圈43從该引擎體15向外延伸過大，以及可使該引擎 體15、護罩38、點火線圈43在一緊湊條件下設置。所以， 可使該引擎13變得較小，這對於如一鞍式車輛就非常有 用，對鞍式車輛而言，車體之尺寸減小係絕對必要的。 如上所述，该濩罩38具有引導部分56，該引導部分56從 該風扇37之外面附近沿徑向方向幾乎直線地延伸，把風B 攸5亥風扇37導向該火星塞34，並且將該點火線圈43設置在 該引導部分56之外面附近。 假如該引導部分56位於該護罩38之内側或外側，此與上 述幾乎直線地延伸位置相比，來自該風扇37之風B就不大可 能被直線地導向該火星塞3 4之一端，這對於用空氣有效地 冷卻該火星塞3 4之一端就不是優選的。考慮到上述功用， 於是將該引導部分56設計成可滿足該護罩3 8較小之需要， 並且傾向於在該護罩3 8外面形成凹部。 所以，如上所述，該點火線圈43設置在該引導部分56之 外面附近，並且更有把握地防止該點火線圈43從該引擎體 O:\91\91117.DOC -18- 200422513 15向外延伸過多，並且可使該引擎體15、護罩38和點火線 圈43在一緊湊條件下設置。所以，可更有把握地使該引擎 13變得較小’這對於如一鞍式車輛1係比較有用的，對鞍式 車輛而言，引擎體之維護係有強烈之需求。 如上所述，將該點火線圈43設置在該護罩38之上面附近。 所以，如果該引擎13被用作車輛1中的一驅動裝置7，當 車輛1行進時，該護罩38防止從該車輛行進面8上濺起之泥 水或水進入该點火線圈43，也就是說，該護罩3 8保護了該 點火線圈4 3。 如上所述’該護罩3 8藉由該彈性體41由該引擎體1 5支 撐’用電纟覽49連接到該火星塞34之點火線圈43由該護罩38 支撐’該護罩由樹脂製成且整體上具有彈性。 所以，當該引擎體15之振動被傳向該點火線圈43之方向 時，振動由該樹脂護罩3 8、彈性體41和電纟覽4 9分別具有的 緩衝作用吸收。所以，阻止引擎體15之振動傳向該點火線 圈43，這就增加了該點火線圈43之使用期限。 上述之描述針對圖中之實施例而言，但該引擎13可以係 一雙衝程引擎，或是如在一發電機等中使用之引擎。該離 、風扇3 7也可以係一滿輪風扇。該護罩3 8可以用來覆蓋該 曲柄軸箱18或汽缸19之全部或一部分。該護罩38之部分55 及引導部分56可以結合在一起。 【圖式簡單說明】 圖1係沿圖2剖面線所取之一局部放大截面圖。 圖2係該車輛後部之側視圖。 〇A9l\9lll7.D〇C -19- 200422513 圖3係圖1之平面視圖。 圖4係沿圖1之剖面線4 一 4所取之局部截面圖。 圖5係沿圖1之剖面線5 — 5所取之截面圖。 【圖式代表符號說明】 1 車輛 2 車體 4 減速裝置 5 後輪 6 支撐之座 7 驅動裝置 8 車輛行進面 9 樞轉軸 10 軸 11 驅動單元 12 振動吸收器 13 引擎 14 懸掛裝置 15 引擎體 16 (曲柄軸）中心線 17 曲柄軸 18 曲柄軸箱 19 汽缸 20 中心線 21 汽缸孔 O:\91\91117.DOC -20- 200422513 25 4匕油器 28 排氣口 29 排氣管 30 上下緊固件 31 支架板 34 火星塞 35 放電部分 37 風扇 38 護罩 39 緊固件 40 空氣導引口 41 彈性體 43 點火線圈 44 支架 45 支撐件 46 支撐件 47 緊固件 48 緊固件 49 電纔 51 第一護罩件 52 第二護罩件 53 第三護罩件 55 部分 56 引導部分 O:\91\91117.DOC -21 200422513 57 凹槽部分 60 操作部份 61 凹槽 62 隔絕材料 A 方向 B 風 O:\91\91117.DOC -22O: \ 91 \ 91117.DOC -16- 200422513 Maintenance of one of the outer side of vehicle 1. The wide space can easily complete the extension of the tensioning part of the chain of the ignition coil 43 and the chain is used to be located above the cylinder 19: the cylinder 19, the crank shaft 17. One of the -tank ^ extension ^ power reading mechanism is connected to ... a 53 formed on the 53-groove 61, the operation 邛 is 60 can be installed in the groove 61 ^ ,. T and § the third shield When the female member 53 enters / removes from the eighth of the cylinder 19 ... side, the groove 61 prevents the operation section knife 60 from blocking the three shield members 53 and can be smoothly installed. A flexible insulation material made of a rubber sheet and grooves are disposed under the gas barrier 26, and the flexible insulation material 62 covers each of the lead 15 and the cover 38. The insulating material 62 is held in a special position by using a bracket 44. That is to say, the insulating material is press-fitted onto the cover 38 by the support 44 so as to hold Γ in a specific position by using the support 44. Therefore, by using the bracket 44, the holding of the insulating material 62 can be completed with a simple structure. The field-driven engine is 13%. The driving force of the engine 3 is transmitted to the rear wheel 5 through the reduction gear i, so the vehicle can travel. As the engine 13 is driven, the fan 3 7¼ crank shaft 17 rotates in a direction a, and the wind b from the fan 37 is directed to the A-cylinder 19 and the spark plug 34, so that they can be cooled by air. In particular, the wind B is forcibly guided to the spark plug 34 by the guide portion 56 of the shroud 38, so the spark plug 34 is effectively cooled by the air. After cooling the cylinder 19 and the spark plug 34 with air, the wind b flows through the air guide passage 42 'and is discharged out of the cylinder 9 below. When driving the engine 3, the shroud 38 and insulation material 62 prevent the carburetor 25 and air filter 26 from being generated by the engine block 15 of the engine 13 by O: \ 91 \ 91117.DOC -17- 200422513 Heat. The insulating material 62 also prevents the wind B from leaking out of the shield 38 from the groove 61. According to the above-mentioned structure, the ignition coil 43 is provided near the outside of the portion 55 of the shroud 38 that covers the outer surface of the cylinder 19 in the radial direction. In the embodiment shown in the figure, the outer dimension of the cylinder 19 is smaller than the outer dimension of the crankcase 18 in the radial direction of the cylinder 19. Therefore, the ignition coil 43 is disposed near the outer surface of the portion 55 in the shroud 38, and the shroud 38 covers the outer surface of the cylinder 19 in the radial direction, thereby preventing the ignition coil 43 from moving from the engine block 15 to The extension is too large, and the engine block 15, the shroud 38, and the ignition coil 43 can be arranged in a compact condition. Therefore, the engine 13 can be made smaller, which is very useful for a saddle-type vehicle. For a saddle-type vehicle, it is absolutely necessary to reduce the size of the vehicle body. As described above, the shroud 38 has a guide portion 56 that extends almost linearly in a radial direction from the vicinity of the outer surface of the fan 37, guides the wind fan 35 to the spark plug 34, and The ignition coil 43 is provided near the outer surface of the guide portion 56. If the guide portion 56 is located inside or outside the shroud 38, compared to the above-mentioned almost linearly extending position, the wind B from the fan 37 is unlikely to be directed straight to one end of the Mars plug 34. It is not preferable to effectively cool one end of the spark plug 34 with air. In view of the above functions, the guide portion 56 is designed to meet the requirement that the shroud 38 is smaller, and a recessed portion is tended to be formed outside the shroud 38. Therefore, as described above, the ignition coil 43 is provided near the outer surface of the guide portion 56 and the ignition coil 43 is more surely prevented from extending outward from the engine block O: \ 91 \ 91117.DOC -18- 200422513 15 It is too much, and the engine block 15, the shroud 38, and the ignition coil 43 can be arranged in a compact condition. Therefore, the engine 13 can be made smaller with greater certainty. This is useful for a saddle-type vehicle 1 series. For a saddle-type vehicle, there is a strong demand for the maintenance of the engine block. As described above, the ignition coil 43 is provided near the upper surface of the shield 38. Therefore, if the engine 13 is used as a driving device 7 in the vehicle 1, the shroud 38 prevents muddy water or water splashing from the running surface 8 of the vehicle 1 from entering the ignition coil 43 when the vehicle 1 is traveling, that is, Said that the shield 38 protects the ignition coil 43. As described above, 'the shroud 38 is supported by the engine body 15 through the elastic body 41', the ignition coil 43 connected to the spark plug 34 with the electric view 49 is supported by the shroud 38, and the shroud is made of resin. Made and elastic as a whole. Therefore, when the vibration of the engine body 15 is transmitted in the direction of the ignition coil 43, the vibration is absorbed by the cushioning effects of the resin shield 38, the elastic body 41, and the electric view 49 respectively. Therefore, the vibration of the engine block 15 is prevented from being transmitted to the ignition coil 43, which increases the life of the ignition coil 43. The above description is for the embodiment in the figure, but the engine 13 may be a two-stroke engine or an engine such as used in a generator or the like. The fan and fan 37 can also be a full-wheel fan. The shield 38 can be used to cover all or a part of the crankcase 18 or the cylinder 19. The portion 55 and the guide portion 56 of the shield 38 may be combined together. [Brief description of the drawings] FIG. 1 is a partially enlarged cross-sectional view taken along the section line of FIG. 2. Figure 2 is a side view of the rear of the vehicle. 〇A9l \ 9lll7.D〇C -19- 200422513 Figure 3 is a plan view of Figure 1. FIG. 4 is a partial cross-sectional view taken along section line 4-4 of FIG. 1. FIG. FIG. 5 is a sectional view taken along section line 5-5 of FIG. 1. FIG. [Illustration of representative symbols] 1 vehicle 2 body 4 reduction gear 5 rear wheel 6 support seat 7 driving device 8 vehicle running surface 9 pivot shaft 10 shaft 11 driving unit 12 vibration absorber 13 engine 14 suspension device 15 engine body 16 (Crankshaft) Centerline 17 Crankshaft 18 Crankshaft box 19 Cylinder 20 Centerline 21 Cylinder hole O: \ 91 \ 91117.DOC -20- 200422513 25 4 Dagger 28 Exhaust port 29 Exhaust pipe 30 Upper and lower fasteners 31 Bracket plate 34 Mars plug 35 Discharge part 37 Fan 38 Shield 39 Fastener 40 Air guide 41 Elastomer 43 Ignition coil 44 Bracket 45 Support 46 Support 47 Fastener 48 Fastener 49 Electricity 51 First shield Piece 52 second shroud piece 53 third shroud piece 55 part 56 guide part O: \ 91 \ 91117.DOC -21 200422513 57 groove part 60 operation part 61 groove 62 insulation material A direction B wind O: \ 91 \ 91117.DOC -22