200400317 玖、發明說明 【發明所屬之技術領域】 本發明係關於一強制空冷式引擎之吸氣連接構造，其在 由圍板覆蓋的汽缸頭上設有使吸氣口開口的安裝面，該安 裝面上介裝著絕緣體而固緊著輸入管。 【先前技術】 以往，周知如在日本特開平1 1 -1 〇 8 1 8 7號公報等中已揭 示有上述構造。 【發明內容】 (發明所欲解決之問題） 在上述習知構造中，設有使輸入管插穿於圍板的插穿 孔，輸入管係利用保持該輸入管及絕緣體，同時拴緊插穿 於輸入管的凸緣及絕緣體的螺栓，而固緊於汽缸頭的安裝 面。爲此，在將螺栓插穿於上述凸緣及絕緣體時，安裝面 側的螺絲孔將由上述凸緣及絕緣體所遮蔽，從而較難稱其 組裝性優良。 本發明係鑒於上述情況而提出之發明，其目的在於提供 可提高組裝性之強制空冷式引擎之吸氣連接構造。 (解決問題之手段） 爲達成上述目的，申請專利範圍第1項之發明，係在由 圍板覆蓋的汽缸頭上設有使吸氣口開口的安裝面，該安裝 面上介設絕緣體而固緊著輸入管之強制空冷式引擎之吸氣 連接構造中，其特徵爲：在上述圍板設有嵌合、定位上述 絕緣體的開口部。 5 312/發明說明書(補件)/92-06/92107264 200400317 根據如上述之申請專利範圍第1項發明之構成，因爲利 用嵌合於開口部使得絕緣體被定位保持於圍板，而且，絕 緣體發揮引導螺合於汽缸頭的安裝面所設的螺絲孔之螺栓 的功能，因此，可容易進行螺栓的對於上述螺絲孔的螺合、 固緊，從而可提高組裝性。 此外，申請專利範圍第2項之發明，係加上上述申請專 利範圍第1項之發明的構成，其特徵爲：於合成樹脂製的 上述圍板上所設的上述開口部的局部內側面及上述絕緣體 的局部側面間形成排風口，根據如上述的構成，利用從排 風口排出的溫風用以暖和輸入管，可提升暖機性能，而且， 將圍板的成型時形成開口部用的模具部分，以包含對應於 上述排風口的部分的方式設置爲較爲大型化以便提高強 度，即可提高模具的壽命度。 又，申請專利範圍第3項之發明，係加上上述申請專利 範圍第2項之發明的構成，其特徵爲：上述絕緣體的厚度 T係設定爲較上述安裝面及上述圍板間的間隔大，根據如 上述的構成，以壓抵於安裝面的方式將絕緣體嵌合於開口 部，即可於組裝時防止絕緣體從圍板脫落，可進一步提升 組裝性。 【實施方式】 以下，參照所附圖式所示本發明之一實施例，說明本發 明之實施形態。 圖1〜圖17爲顯示本發明之一實施例者，圖1爲摩托車 型機車的側視圖，圖2爲省略車體罩殼及收納箱的狀態時 6 312/發明說明書(補件)/92-06/92107264 200400317 的摩托車型機車的中間部的立體圖，圖3爲沿者圖1中之 3 -3線所作的放大剖面圖，圖4爲沿著圖3中之則頭4所 作的箭視圖，目5爲沿著圖3中之箭頭5所作的箭視圖， 圖6爲沿著圖3中之ό - 6線所作的剖面圖，圖7爲從汽缸 頭側看頭蓋時的圖，圖8爲沿著圖7中之8 -8線所作的°[J 面圖，圖9爲沿著圖ό中之9 -9線所作的放大剖面圖，圖 1 〇爲沿著圖9中之1 0 - 1 〇線所作的剖面圖’圖1 1爲Α者 圖4中之1 1 - 1 1線所作的剖面圖，圖1 2爲沿著圖5中之 1 2 -1 2線所作的放大剖面圖，圖1 3爲沿著圖5中之1 3 -1 3 線所作的剖面圖，圖1 4爲沿著圖2中之1 4 -1 4線所作的放 大剖面圖，圖1 5爲沿著圖1 4中之1 5 - 1 5線所作的剖面圖’ 圖1 6爲沿著圖1 4中之1 6 - 1 6線所作的剖面圖’圖1 7爲沿 著圖1 4中之1 7 -1 7線所作的剖面圖。 首先，於圖1及圖2中，摩托車型機車之車體框架25 包括：前端固接於頭管26的主架管27、呈直角固接於該 主架管2 7的後端的橫跨管2 8、及前端分別連設於橫跨管 28的兩端部的左右一對作爲後框架構件的後架管29、30 ° 主架管27係一體連設著從頭管26向著後下方傾斜的下 降框架部27a、及從下降框架部27a的後端呈大致水平向 著後方延伸的低框架部27b而構成。此外，左右一對的後 架管29、30，係一體連設著從上述橫跨管28的兩端部向 著後上方延伸的斜升框架部2 9 a、3 0 a，及從斜升框架部 2 9 a、3 0 a的後端呈大致水平向著後方延伸、同時以後端部 開口相互面對的方式在水平面內彎曲的上部框架部2 9b、 7 312/發明說明書(補件)/92-06/92107264 200400317 3 〇b而成。 上述頭管26上支持著可操縱方向的跨於前輪WF上的前 叉3 1，前叉3 1的上端連結著方向操縱把手3 2。 在車體框架25的兩後架管29、30的前部，介由連桿機 構3 3支持著可上下搖動的動力單元P的前部，配置於該 動力單元P的後部右側的後輪WR係軸支於動力單元P的 後部。 圖3〜圖6中，動力單元P係由配置於後輪WR的前方 的強制空冷式單氣筒的4行程的引擎E、及設於該引擎E 及上述後輪WR間,的無段變速機Μ所構成。 引擎Ε之引擎本體34係爲具備曲柄箱35、結合於曲柄 箱3 5的汽缸塊3 6、在曲柄箱3 5的相反側與汽缸塊3 6結 合的汽缸頭3 7及在汽缸塊3 6的相反側與汽缸頭3 7結合的 頭蓋3 8，且配置於車體框架2 5的兩後架管2 9、3 0間者， 汽缸頭3 7係配置於兩後架管2 9、3 0前部的斜升框架部 2 9 a、3 0 a的下部間。 汽缸塊3 6係爲以沿著設於汽缸塊3 6的汽缸腔3 9的軸 線、亦即汽缸軸線C沿著機車的前後方向成略微前上傾而 成爲大致水平的方式所配置者，在汽缸頭3 7及可滑動自如 地嵌合於上述汽缸腔39的活塞40之間形成燃燒室41。此 外，活塞4 0係介由連桿4 2及曲柄銷4 3，連結於具有與後 輪WR的旋轉軸線平行的旋轉軸線的曲柄軸44。 曲柄軸44係由含有上述汽缸軸線C、同時與該曲柄軸 44的軸線垂直的平面所結合的一對箱體部3 5 a、3 5b所構 8 312/發明說明書(補件)/92-06/92107264 200400317 成的曲柄箱3 5支持爲可旋轉自如’曲柄軸44係於一端的 箱構件3 5 a及曲柄軸4 4之間介裝著第1滾珠軸承4 5，及 在另一端的箱構件3 5 b及曲柄軸4 4之間介裝著第2滾珠軸 承4 6 〇 在汽缸頭3 7的上部側面設有可連通上述燃燒室4 1的吸 氣口 47，在汽缸頭3 7的下部側面設有可連通上述燃燒室 4 1的排氣口 4 8。分別用以開閉吸氣口 4 7及排氣口 4 8的吸 氣閥49及排氣閥50，係以在與曲柄軸44的旋轉軸線垂直 的平面的投影圖上排列爲略V字狀的方式配設於汽缸頭 37上，在關閉吸氣口 47及排氣口 48的方向分別受到加勢 能。此外，面向著燃燒室4 1的火星塞5 1係安裝於汽缸頭 3 7上的左右至少一端側，在本實施例中係以向著機車的行 進方向前方的狀態安裝在右側的側面。 在汽缸頭3 7及頭蓋3 8之間，收容著開閉驅動上述吸氣 閥49及排氣閥50的動閥機構52，該動閥機構52包括： 具有與曲柄軸44的軸線平行的軸線且可旋轉自如地被支 持於汽缸頭37、同時具有吸氣用及排氣用凸輪54、53的 凸輪軸5 5 ;具有與凸輪軸5 5平行的軸線，且被支持於汽 缸頭3 7的吸氣側及排氣側的搖軸5 6、5 7 ;以隨動於上述 吸氣用凸輪54而驅動吸氣閥49的方式可搖動自如地支持 於吸氣側搖軸5 6的吸氣側搖臂5 8 ;及以隨動於上述排氣 用凸輪5 3而開閉驅動排氣閥5 0的方式可搖動自如地支持 於排氣側搖軸5 7的排氣側搖臂5 9。 於凸輪軸55的一端部固定著被動鏈輪60。另一方面， 9 312/發明說明書(補件)/92-06/92107264 200400317 在曲柄軸4 4上較第2滾珠軸承4 6的外端側，在對應於上 述被動鏈輪6 0的位置固定著驅動鏈輪6 1，驅動及被動鏈 輪6 1、6 0上卷掛著無接縫的凸輪鏈條6 2，凸輪鏈條6 2係 被收納爲可沿著通過汽缸塊3 6、汽缸頭3 7及頭蓋3 8而形 成的收納室6 3內行走。藉由如此的驅動鏈輪6 1、被動鏈 輪6 0及凸輪鏈條6 2，以曲柄軸4 4的旋轉數的一半旋轉數 旋轉驅動著凸輪軸5 5。 在較第1滾珠軸承4 5的外端側，曲柄軸4 4上固定著驅 動齒輪64，以從形成於曲柄箱3 5內的下部的潤滑油儲積 部6 5介由潤滑油過濾器7 9吸起潤滑油的方式安裝於曲柄 箱3 5的油栗6 6 ’係藉由上述驅動齒輪6 4所驅動。 從該油泵66吐出的潤滑油的一部分係用於潤滑動閥機 構52者，在曲柄箱35、汽缸塊36、汽缸頭37及頭蓋38 設有將來自油泵66的潤滑油導向動閥機構52用的潤滑油 供給路67。而且，在汽缸頭37，且在較排氣口 48更接近 於吸氣口 47的位置配置著潤滑油供給路67，本實施例中， 在與曲柄軸44的軸線垂直的平面的投影圖上，在與吸氣口 47交叉的位置配置著潤滑油供給路67。 一倂參照圖7及圖8，上述潤滑油供給路67的下游端 部，係由以將來自汽缸頭3 7側的潤滑油供給一端的方式設 於頭蓋3 8的與汽缸頭3 7的結合面的流通溝6 8，及連通該 流通溝6 8的另一端且設於頭蓋3 8的側壁的有底流通孔6 9 所構成，連通流通孔69的內端部的噴出孔70 ’係以向著 動閥機構5 2噴出潤滑油的方式設於頭蓋3 8的側壁內面。 10 312/發明說明書(補件)/92-06/92107264 200400317 此外，在頭蓋3 8設有連通上述流通溝6 8的一端的有底 檢測孔7 1，同時，在對應於該檢測孔7丨的位置一體突設 著從頭蓋3 8的外面向著外側突出的安裝轂72，該安裝轂 7 2上以使檢測元件部7 3 a突入上述檢測孔7 1的方式安裝 著溫度檢測器7 3。也就是說，溫度檢測器7 3係以使檢測 元件部73a面向著潤滑油供給路67的方式安裝於引擎本體 3 4的頭蓋3 8上。 注意圖3，在較上述驅動齒輪64的外端側，配設著具備 固定於曲柄箱35上的定子74、以圍繞著該定子74的方式 固定於曲柄軸44上的外部轉子75的發電機76，在較該發 電機76的外端，曲柄軸44上固定著風扇77。該風扇77 係由一體設於由多個例如藉4個螺栓7 8、7 8…固緊於發電 機76的外部轉子75的基部77a的外周部的多個葉片77b、 7 7 b…所構成者。 引擎本體34中至少汽缸塊36及汽缸頭37、本實施例中 曲柄箱3 5的局部、汽缸塊3 6、汽缸頭3 7係由圍板8 2所 覆蓋，將引擎本體34及圍板82間形成的流通路81，流通 從風扇7 7吐出的強制空冷用的空氣。而且，在汽缸塊3 6 及汽缸頭3 7的外面，爲了可進行藉由流過上述流通路8 1 的冷卻空氣的有效冷卻，分別突設著多個冷卻鰭片 36a··· 、37a··· 〇 上述圍板82係由以協動且覆蓋汽缸塊36及汽缸頭37 的方式相互結合的上下一對的上部及下部罩體構件8 3、8 4 及覆蓋曲柄箱35的局部且結合於上述兩罩體構件83、84 11 312/發明說明書(補件)/92-06/92107264 200400317 的風扇罩85所構成，上述上部罩體構件83、下部I 件84及風扇罩85，係分別由合成樹脂所形成。 上部罩體構件83上突設著從與下部罩體構件84 面86突出於下部罩體構件84側的多個繫合爪87… 部罩體構件8 4設有彈性繫合著上述各繫合爪8 7…庄 部88···。此外，在上部及下部罩體構件83、84分另 設置著由接合面8 6相互頂接的多個被固緊部8 9…、 相互頂接的被固緊部89···、90…係由螺絲零件91… 緊。 如此，對於繫合爪8 7…的繫止部8 8…的彈性繫合 藉由被固緊部89···、90···的螺絲零件91…的固緊， 下部罩體構件83、84相互結合，於是，頭蓋38從_ 下部罩體構件83、84向著前方側突出。 風扇罩8 5係以覆蓋曲柄箱3 5的局部的箱構件3 5 扇77的方式固緊於箱構件35a上者，且藉由多個螺 92…固緊於上述上部及下部罩體構件83、84。 該風扇罩85上，以對應於風扇77的外側的方式 成向著上述風扇77側而從外部吸引空氣用的吸引口 吸引筒94，且在吸引口 93上設有散熱窗95。 該散熱窗95係由與吸引筒94同心配置的多個、 5個的環部95a〜95d，及呈放射狀延伸且連結吸引ΐ 及各環部95a〜95d間的多個連結部95e…所構成， 於此等連結部9 5 e…之1個位置，在風扇罩8 5的外 著對準曲柄軸44的相位用的例如爲三角形狀的定時 312/發明說明書(補件)/92-06/92107264 i體構 的接合 ，在下 )繫止 丨卜體 9 0···， 相互固 ，及 上部及 上部及 a及風 絲零件 設置形 93的 例如爲 奇94 在對應 面標示 標誌 12 200400317 9 6。該定時標誌9 6係爲如對準點火用的時間用者，利用將 風扇77固定於曲柄軸44用的多個、例如爲4個螺栓78… 中的一個，定位於上述散熱窗9 5中對應於定時標誌9 6的 連結部9 5 e，即可容易進行點火用的時間的相位配合。 又，上述定時標誌9 6不僅用於點火用之時間對準，而 且還可用於TDC及BDC的時間對準，此外，動閥機構52 在構成爲可改變吸氣閥4 9及排氣閥5 0的至少一方的作動 特性的情況，也可用於其作動特性改變的時間對準。 一倂參照圖9及圖1 0，在汽缸頭3 7的上部側面設有使 吸氣口 47開口的平坦的安裝面97，該安裝面97上介裝著 絕緣體99而固緊著輸入管98的下端。 輸入管98的下端一體設有凸緣部98a，具有連通吸氣口 47的吸氣孔100的絕緣體99及上述安裝面97，係形成爲 具有對應於上述凸緣部9 8 a的形狀。 在絕緣體99的兩面安裝著呈無接縫狀包圍上述吸氣孔 100的墊圈101、1〇2，其中，在絕緣體99及安裝面97間 安裝著一邊的墊圈101，而在絕緣體99及上述凸緣部98a 間安裝著墊圈102。而且，絕緣體99的厚度T係設定爲較 安裝面97及圍板82之上部罩體構件83間的間隔S大。 在吸氣口 4 7的兩側，其安裝面9 7上設置著有底的螺絲 孔103、103，插穿於凸緣部98a及絕緣體99的螺栓1〇4、 104被繫合於上述各螺絲孔103、103，藉由拴緊螺栓ι〇4、 104即可介由絕緣體99將輸入管98固緊於安裝面97。 但是，在覆蓋汽缸頭37的圍板82中，上部罩體構件83 13 312/發明說明書(補件)/92-06/92107264 200400317 上設有嵌合、定位上述絕緣體99用的開口部105。該開口 部1 05如圖1 0所示係形成爲較絕緣體99大，在該開口部 1 0 5的局部側面及絕緣體9 9的局部側面間，形成將流通經 過流通路8 1而來的冷卻用空氣排出至外部用的排風口 106 α 上述輸入管98的上游端係介由連接軟管107而連接配 置於較該輸入管9 8後側的氣化器1 〇 8的下游端，氣化器 1〇8的上游端係介由連接管109而連接配置於後輪WR的 左側面的空氣濾淨器1 1 0。 圖1 1中，氣化器1 〇 8上附設有基於上述溫度檢測器7 3 的檢測値而被通電控制的機車起動器1 1 1，該機車起動器 111係以迂迴具備氣化器108的節流閥（未圖示）的方式，且 開閉設於氣化器1 0 8的氣化器本體1 1 2的起動用混合氣通 路1 1 3的中間處的方式安裝於氣化器本體1 1 2上。 在上述起動用混合氣通路113，以介設於較機車起動器 1 1 1更上游側的部分的方式，在氣化器本體1 1 2上固定著 放氣管114，在氣化器本體112的下部固定著上部由該放 氣管1 1 4的下部突入的燃料噴嘴1 1 5。此外，在氣化器本 體1 1 2的下部固定著儲積燃料用的燃料箱1 1 6，上述燃料 噴嘴1 1 5的下部係突入燃料箱1 1 6內的燃料中。 機車起動器111具有可進退自如地插入較放氣管114的 下游側且設於起動用混合氣通路1 1 3的通路中段部的噴嘴 1 1 7的針閥1 1 8，針閥1 1 8之在噴嘴1 1 7內的位置係藉由機 車起動器1 1 1的通電控制所決定，藉以決定流通經過起動 14 312/發明說明書(補件)/92-06/92107264 200400317 用混合氣通路1 1 3的起動用混合氣的量。 在構成圍板8 2之局部的上部及下部罩體構件8 3、8 4的 配合面86間形成嵌合孔120。而且，連接火星塞51之栓 塞帽121在嵌合孔120的周圍具有頂接上部及下部罩體構 件83、84的外面的鍔部121a且嵌合於上述嵌合孔101。 此外，上述上部及下部罩體構件8 3、8 4中，上部罩體 構件83上一體設置著從上面覆蓋嵌入嵌合孔12〇的栓塞帽 1 2 1的嵌合部的庇護部1 2 2，在該庇護部1 2 2的前端部，如 圖1 2所示，形成頂接且繋合栓塞帽1 2 1以便阻止該栓塞帽 1 2 1繞火星塞5 1之軸線周圍旋轉的止旋定位部1 2 2 a。 上述庇護部1 22係爲以從上面覆蓋著形成爲從栓塞帽 121向著前方將連接於栓塞帽121 ·的高壓電纜線123的一 部分延伸的姿勢的栓塞帽1 2 1的嵌入嵌合孔1 20的嵌合部 的方式而形成者，止旋定位部122a係將利用來自高壓電纜 線1 23作用的彈性力而對於火星塞5 1的軸線周圍一端增勢 的栓塞帽1 2 1，以對抗並接受上述彈性力的方式形成於庇 護部122。 一倂參照圖1 3，上部罩體構件83上一體形成連續上述 庇護部122而連設的夾具安裝座125，利用彈性安裝於該 夾具安裝座125上的夾具124,保持連設於上述栓塞帽121 的筒壓電續線1 2 3。 另外，引擎本體34係以將汽缸頭37配置於左右一對的 後架管29、30前部的斜升框架部29a、30a的下部間的方 式而支持於車體框架25上，上述栓塞帽121也配置於兩斜 15 312/發明說明書(補件)/92-06/92107264 200400317 升框架部29a、30a的下部間，在兩斜升框择 一端的右側的斜升框架部3 0 a的上部’如圖 持著點火感應圈1 2 6。 一端連設於點火感應圈1 2 6的高壓電纜線 端，係從較繫合於止旋定位部122a的上述栓 方向著後方呈略U字狀折返而連接於栓塞帽 一倂參照圖1 4〜圖1 7，上述圍板8 2的上] 上一體設有，前端部具有相互面對著且向著 出的繫合突部128a、128a，同時，從上部罩 外面暨起的一*對夠1 2 8、1 2 8 ;及連結於上述 間，同時，相互面對著且從上部罩體構件8 3 一對連結壁1 2 9、1 3 0，同時還設有由此等鉤 連結壁1 2 9、1 3 0所包圍的直角四邊形的透孑[ 在兩鉤128、128之繫合突部128a、128a, 壁129、130之間，夾著相互重疊的同時被壓 128、128間的多個可彎曲長零件，本實施例 壁1 2 9、1 3 0支持的屬內側的可彎曲長零件& 及外面接觸著上述兩繫合突部l28a、128&的 曲長零件的管134，被夾著在繫合突部l28a 結壁1 2 9、1 3 0之間。 上述電纜線133具有軟質的塑膠皮層且連 器7 3，此外，由硬質的彈性材構成的上述管 引導通氣氣體而連接於頭蓋38 ° 而且，上述鉤128係由其基端部的全長連 312/發明說明書(補件)/92-06/92107264 部 29a、 30a 2所明示，支 1 23的另一 塞帽1 2 1的前 121 ° 部罩體構件8 3 相互接近側突 體構件83的 兩夠 128、12 8 的外面豎起的 128 、 128 及 ,13 1° 泛上述兩連結 :入上述兩鉤 中，由兩連結 J電纜線1 3 3， 屬外側的可彎 、1 28a及兩連 接於溫度檢測 1 3 4，係用以 設於上部罩體 16 200400317 構件83的基板部128b ;及在沿著電纜線133及管134的 長度方向隔開間隔的多個部位、例如2個部位連設於上述 基板部128b，同時，前端部突設著上述繫合突部128a的 多個、例如爲2個的分歧板部1 2 8 c、1 2 8 c所構成，在兩連 結壁1 2 9、1 3 0之間支持電纜線1 3 3的補強壁1 3 2，係在各 分歧板部1 2 8 c、1 2 8 c間連設於兩鉤1 2 8、1 2 8之間。 在未由上述圍板82所覆蓋的汽缸頭3 7的下部側面，以 將上游端連設於排氣口 48的方式連接著排氣管1 1 8，配設 於後輪WR的右側的排氣消音器1 1 9則連接著排氣管1 1 8 的下游端。 尤其注意圖3及圖4,在曲柄箱35上以向著機車的行進 方向前方的狀態連接著由後輪WR的左側延伸出的傳動箱 1 3 6。該傳動箱1 3 6係由一體連設於上述曲柄箱3 5的箱構 件3 5b且延設於後方的箱主體137 ;在與該箱主體137之 間形成第1傳動室140且從左側固緊於箱主體137的左側 蓋1 3 8 ;及在與該箱主體1 3 7之間形成第2傳動室1 4 1且 固緊於箱主體1 3 7的右側後部的右側蓋1 3 9所構成。 在傳動箱1 3 6之箱主體1 3 7的前部，以配置於引擎E的 汽缸塊3 6的側面的方式突設著支持腕部1 42，該支持腕部 142係介由連桿機構33而可搖動地被支持於車體框架25 上。 後輪WR的車軸1 4 3係由傳動箱1 3 6之箱主體1 3 7的後 部及右側蓋1 3 9可旋轉自如地支持著。此外，如圖1所示’ 在箱主體137的後部及車體框架25之後架管29的斜升框 17 312/發明說明書(補件)/92-06/92107264 200400317 架部2 9 a之間設有後緩衝器1 4 4。 無段變速機Μ係爲被收納於第1傳動室1 4 0之三角皮帶 式者，在無段變速機Μ及車軸1 4 3之間設置著減速齒輪組 145 ° 無段變速機Μ具備，在第2滾珠軸承4 6的外側連結於 曲柄軸44的端部的驅動側傳動皮帶輪1 46 ;具有與曲柄軸 44平行的軸線且介由離心離合器148而安裝於由箱主體 1 3 7的後部及右側蓋1 3 9所可旋轉自如地支持的被動軸1 47 上的被動側傳動皮帶輪1 4 9 ;及繞掛於兩傳動皮帶輪1 4 6、 149上的無接縫狀的三角皮帶150。 驅動側傳動皮帶輪146係由固定於曲柄軸44上的固定 皮帶輪半體146a;及可滑動地安裝於曲柄軸44上的可動 皮帶輪半體14 6b所構成。在兩皮帶輪半體146a、14 6b之 間形成V字狀的環狀溝1 5 1，該環狀溝1 5 1內插入有三角 皮帶150。此外，在可動皮帶輪半體146b的背面側，在曲 柄軸44上固裝著斜面板152，在可動皮帶輪半體146b及 斜面板1 5 2之間呈浮動狀態收容著多個重量輥1 5 3。當曲 柄軸44的旋轉數增大時，受到離心力作用的重量輥1 5 3 向著曲柄軸44的半徑方向外側移動，使得可動皮帶輪半體 14 6b接近於固定皮帶輪半體146a。藉此，三角皮帶150 之對於兩皮帶輪半體146a、146b的接觸半徑增大。 另一方面，被動側傳動皮帶輪1 49具備，介由離心離合 器148連結於被動軸147，且由被動軸147支持爲可旋轉 自如的支持筒154; —體形成於該支持筒154的固定皮帶 18 312/發明說明書(補件)/92-06/92107264 200400317 輪半體149a ;及可相對於該固定皮帶輪半體149a作接近 或離開動作，且被支持於支持筒154，同時，在向著接近 固定皮帶輪半體149a的方向賦予著彈性勢能的可動皮帶 輪半體149b，在形成於兩皮帶輪半體149a、149b間的V 字狀的環狀溝155內插入有三角皮帶150。而且，可動皮 帶輪半體149b隨著三角皮帶150對於驅動側傳動皮帶輪 146的接觸半徑的增大，可動皮帶輪半體149b以該三角皮 帶1 5 0對於從動側傳動皮帶輪i 49的接觸半徑減小的方式 沿軸方向移動，藉此，在曲柄軸44及被動軸147間進行響 應曲柄軸44的旋轉的無段變速。 在傳動箱1 3 6之左側蓋1 3 8可旋轉自如地支持著反衝軸 156，該反衝軸156的外端設有腳蹬起動踏板157(參照圖 1)。此外，在上述左側蓋1 3 8的內側，在反衝軸1 5 6及曲 柄軸44間設有可將響應腳蹬起動踏板1 5 7的踏入操作的反 衝軸156的動力傳輸給曲柄軸44的反衝式起動裝置158。 減速齒輪組94係設於被動軸147及車軸143之間且收 容於第2傳動室1 4 1內，無段變速機Μ之被動軸1 4 7的旋 轉動力由減速齒輪組94在減速後被傳輸給後輪WR的車軸 143 ° 但是，在車體框架2 5的兩後架管2 9、3 0的前部間，以 配置於引擎Ε的上面的方式支持著可收納安全帽等的收納 箱160，在兩後架管29、30的後部間支持著燃料箱161。 此外，在兩後架管29、30中左側的後架管29的上部框 架部29b的前部支持著可淨化供給引擎Ε的排氣口 48的 19 312/發明說明書(補件)/92-06/92107264 200400317 二次空氣用的二次空氣用空氣濾淨器162。該二次空氣用 空氣濾淨器1 6 2的吸入口上連接著吸氣管1 6 3的下游端， 該吸氣管163的下游端係插入兩後架管29、30中右側的後 架管3 0的上部框架部3 Ob的後端部。 設於引擎E及二次空氣用空氣濾淨器1 62間的二次空氣 控制閥164,係由安裝於左側的後架管29的斜升框架部29a 的撐架165所支持。 此外，在左側的後架管2 9的斜升框架部2 9 a的下部設有 連通於該斜升框架部29a內的連接管部166，而從動力單 元P的無段變速機Μ內導出冷卻空氣用的通風管1 6 7則連 接於上述連接管部166。 車體框架25,係由合成樹脂製車體殼罩168所覆蓋，該 車體殼罩168具備：遮覆駕駛者的腳前方的護腳罩169 ; 用以放置騎乘者的腳部而連設於護腳罩1 69的下部的踏板 17 0;及連設於踏板170且從兩側覆蓋車體後部的側罩171。 側罩1 7 1上設有可從上面開閉收納箱1 60及燃料箱1 6 1 的座椅1 7 2。 以下，說明本實施例之作用，在引擎本體34之曲柄箱 35上，安裝著從曲柄箱35內的潤滑油儲積部65吸起潤滑 油的油泵6 6，而引導用以潤滑動閥機構5 2的潤滑油的潤 滑油供給通路67，係連通油泵66而設於曲柄箱3 5、汽缸 塊3 6、汽缸頭3 7及頭蓋3 8上，溫度檢測器7 3係以其檢 測元件部7 3 a面向著潤滑油供給通路6 7的狀態安裝於引擎 本體34上。 20 312/發明說明書(補件)/92-06/92107264 200400317 在引導潤滑動閥機構5 2用而從油泵6 6吐出的潤滑油的 潤滑油供給通路6 7之中，只要引擎進行運轉則與運轉狀態 及姿勢無關充滿著潤滑油，如上所述，藉由將溫度檢測器 73的檢測元件部73a配置爲面向著該潤滑油供給通路67, 即可極爲不易受到引擎E的運轉狀態及姿勢的變化的影 響，可經常良好且迅速地檢測出引擎溫度，而且，就溫度 檢測器7 3來說不需要檢測潤滑油溫度的其他複雜的構造。 而且，因爲將潤滑油供給通路67配置於汽缸頭37中較 排氣口 48更爲接近吸氣口 47的附近位置，因此，極爲不 易受到來自引擎本體34的外表面部的因環境引起的散熱 的影響，即使在引擎E起動後的低旋轉（空轉狀態）時，仍 可良好地檢測出引擎溫度，可經常良好且迅速地檢測出引 擎溫度。 因爲引擎E係爲以在上述汽缸塊36及汽缸頭37上設置 著空冷用之冷卻鰭片3 6a…、3 7a…的方式構成爲上強制空 冷式者，且，溫度檢測器73係安裝於未設置空冷風扇的頭 蓋38上，因此，即不會受到冷卻鰭片36a···、3 7a…的干 擾而可正確檢測引擎溫度，而且，安裝溫度檢測器7 3用的 構造也變得簡單。 此外，在連接上述吸氣口 4 7的氣化器1 0 8上，安裝著 用以開閉設於該氣化器1 〇8的起動用混合氣通路1 1 3的基 於溫度檢測器73的檢測値進行通電控制的機車起動器 1 1 1，因此，基於由溫度檢測器73正確檢測出的引擎溫度， 將起動時供給引擎E的混合氣最合適化，從而可提升引擎 21 312/發明說明書(補件)/92-06/92107264 200400317 E的暖機性能。 此外，汽缸塊3 6及汽缸頭3 7，係由使強制空冷用的空 熟流通的流通路8 1形成於汽缸塊3 6及汽缸頭3 7之間的圍 板8 2所覆蓋，藉由以不受強制性送風的冷卻風的影響的方 式而於頭蓋3 8安裝著溫度檢測器73，即使爲強制空冷引 擎之同時，還可正確檢測引擎溫度。 雖於汽缸頭3 7之上部側面，設有使吸氣口 4 7開口的平 坦的安裝面97，該安裝面97上介由絕緣體99而固緊著輸 入管98,但是，在圍板82的上部罩體構件83設有可嵌合、 定位絕緣體9 9的開口部1 〇 5。 據此，利用嵌合於開口部1 0 5使得絕緣體9 9被定位保 持於圍板8 2，而且，絕緣體9 9發揮引導螺合於汽缸頭3 7 的安裝面97所設的螺絲孔1 〇3…的螺栓1 04…的功能，因 此’可容易進行螺栓1 0 4…的對於螺絲孔1 〇 3…的螺合、固 緊，從而可提高組裝性。 此外，因爲於合成樹脂製的上部罩體構件83上所設的 開口部1 05的局部內側面及絕緣體99的局部側面間形成排 風口 1 06，因此，利用從排風口 1 06排出的溫風用以暖和 輸入管98，可提升暖機性能。而且，將上部罩體構件83 的成型時形成開口部1 05用的模具部分，以包含對應於上 述排風口 106的部分的方式設置爲較爲大型化以便提高強 度，即可提高模具的壽命度。 又，由於將絕緣體的厚度T係設定爲較安裝面97及圍 板8 2間的間隔S大，因此，以壓抵於安裝面9 7的方式將 22 312/發明說明書(補件)/92-06/92107264 200400317 絕緣體99嵌合於開口部105,即可於組裝時防止絕緣體99 從圍板82脫落，可進一步提升組裝性。 另外，連接於汽缸頭3 7的右側面所安裝的火星塞5 1的 栓塞帽1 2 1及點火感應圈1 2 6，係介由高壓電纜線1 2 3所 連接，但是，點火感應圈1 26係以位於較汽缸頭3 7後方的 方式而被支持於右側的後架管3 0，一端連接於該點火感應 圈1 2 6的上述高壓電纜線1 2 3的另一端，係從較栓塞帽1 2 1 的前方向著後方呈略U字狀折返而連接於該栓塞帽121。 據此，連接於該栓塞帽1 2 1之高壓電纜線1 2 3，成爲從 該栓塞帽121向著前方延伸，即使栓塞帽121與車體框架 2 5中配置於栓塞帽1 2 1的外側的框架構件、亦即與右側的 後架管30之間的間隔變窄，仍可避免與車體框架25的干 涉，而可增大配置高壓電纜線1 2 3的自由度，同時，較大 地設定高壓電纜線1 2 3的彎曲半徑，可提升高壓電纜線1 2 3 的耐久性。 圍板82係爲具備以協動且覆蓋汽缸塊36及汽缸頭37 的方式，而相互結合的上下一對的上部及下部罩體構件 8 3、8 4者，嵌合連接於汽缸頭3 7的右側面安裝的火星塞 5 1的栓塞帽1 2 1用的嵌合孔1 2 0，係形成於兩罩體構件 83、84的配合面86間。而且，上部罩體構件83上一體設 置著從上面覆蓋嵌入嵌合孔120的栓塞帽121的嵌合部的 庇護部1 22，利用來自高壓電纜線i 23作用的彈性力而對 於火星塞5 1的軸線周圍一端增勢的栓塞帽丨2 1，以對抗上 述彈性力而承受著栓塞帽1 2 1的方式頂接、繫合於庇護部 23 312/發明說明書(補件)/92-06/92107264 200400317 1 2 2上形成的止旋定位部1 2 2 a。 也就是說，栓塞帽1 2 1係利用來自高壓電纜線1 23 的彈性力頂接、繫合於庇護部1 22上形成的止旋定位 122a，因此，可防止在引擎運轉中栓塞帽121繞火星 之軸線周圍旋轉，藉此，以防止高壓電纜線1 2 3的振 可有效防止該高壓電纜線1 23與其他零件的接觸。 而且，藉由庇護部122從上面覆蓋著栓塞帽121的 嵌合孔1 20的嵌合部，因此，可防止碰觸且掉落於比 本體34較爲上面的構件、例如收納箱1 60的泥水等附 高壓電纜線1 23及栓塞帽1 2 1的連接部。 此外，保持高壓電纜線123的夾具124，係安裝於^ 上述庇護部122而形成於上部罩體構件83的夾具安参 1 2 5上，因此，以在栓塞帽1 2 1附近保持著高壓電纜竊 的方式，即可更爲有效地防止高壓電纜線1 23的振動 外，藉由夾具安裝座125可增加庇護部122的強度。 此外，圍板82的上部罩體構件83上一體設有，前 具有相互面對著且向著相互接近側突出的繫合突部 1 2 8 a、1 2 8 a，同時，從上部罩體構件8 3的外面豎起的 鉤1 2 8、1 2 8 ;及連結於上述兩鉤1 2 8、1 2 8間，同時 互面對著且從上部罩體構件83的外面豎起的一對連糸丨 129、130，同時還設有由此等鉤128、128及連結壁 1 3 0所包圍的直角四邊形的透孔1 3 1。 在兩鉤128、128之繫合突部128a、128a及上述兩 壁129、130之間，夾著相互重疊且被壓入上述兩鉤 312/發明說明書(補件)/92-06/92107264 作用 部 塞51 動， 嵌入 引擎 著於 婁續 I座 ^ 123 ，此 端部 一對 ，相 §壁 129、 連結 128、 24 200400317 1 2 8間的電纜線1 3 3及管1 3 4。 據此，在合成樹脂製的上部罩體構件8 3的成型時，可 以未採用脫模的簡單模具構造一體形成一對鉤128、128 及一對連結壁1 29、1 3 0，即使不使用機車所具備的上部罩 體構件8 3以外的零件，仍可由兩鉤1 2 8、1 2 8及兩連結壁 129、130穩定支持著電纜線133及管134，因而可減低零 件數及組裝作業工時，同時，可將電纜線1 3 3及管1 3 4穩 定支持於上部罩體構件8 3的平坦面。 而且，透孔1 3 1係由相互重疊的電纜線1 3 3及管1 3 4所 覆蓋，在支持著電纜線1 3 3及管1 3 4的狀態則無法從上述 透孔1 3 1看見上部罩體構件8 3內、亦即圍板8 2內。 也就是說，透孔1 3 1係爲由相互疊層的電纜線1 3 3及管 1 34所覆蓋，利用防止冷卻風從圍板82洩漏以穩定維持強 制空冷式引擎E的冷卻性能，同時可於圍板82支持著電 纜線1 3 3及管1 3 4，而且，可防止冷卻風從透孔1 3 1洩漏， 因此，以不致噴射灰塵於圍板8 2的外表面側的方式即可防 止外觀性的下降。 上述電纜線1 3 3具有軟質的塑膠皮層且連接於溫度檢測 器7 3，此外，上述管1 3 4由硬質的彈性材構成，用以引導 通氣氣體而連接於頭蓋3 8，使電纜線1 3 3外面的塑膠皮層 充分密接於兩連結壁1 2 9、1 3 0，同時，利用於管1 3 4的外 面確實繫合著兩鉤128、128之前端部的繋合突部128a、 128a，即可更爲確實地支持著電纜線133及管134。 而且，上述鉤1 2 8係由其基端部的全長連設於上部罩體 25 312/發明說明書(補件)/92-06/92107264 200400317 構件8 3的基板部1 2 8 b ;及在沿著電纜線1 3 3及管1 3 4的 長度方向隔開間隔的多個部位、例如2個部位連設於上述 基板部128b，同時，於前端部突設著上述繋合突部128a · 的多個、例如爲2個的分歧板部1 2 8 c、1 2 8 c所構成，在兩 、 連結壁1 2 9、1 3 0之間支持電纜線1 3 3的補強壁1 3 2，係在 各分歧板部1 2 8 c、1 2 8 c間連設於兩鉤1 2 8、1 2 8之間。 爲此，以藉由補強壁1 3 2支持內側的電纜線1 3 3的方 式，即可更爲穩定地支持著電纜線1 3 3及管1 3 4，同時， 藉由補強壁132可增加兩鉤128、128的強度。 修 以上，說明了本發明之實施形態，但是，本發明並不限 於上述實施形態，只要未超出申請專利範圍所記載之本發 明的範圍，即可作各式各樣的設計變更。 (發明效果） 如上述，根據申請專利範圍第1項的發明，利用使絕緣 體嵌合於開口部使得絕緣體被定位保持於圍板，而且，可 容易進行螺栓的對於上述螺絲孔的螺合、固緊，從而可提 高組裝性。 Φ 此外，根據申請專利範圍第2項的發明，利用從排風口 排出的溫風用以暖和輸入管，可提升暖機性能，而且，將 圍板的成型時形成開口部用的模具部分，以包含對應於上 述排風口的部分的方式設置爲較爲大型化以便提高強度， ^ 即可提高模具的壽命度。 · 此外，根據申請專利範圍第3項的發明，以壓抵於安裝 面的方式將絕緣體嵌合於開口部，即可於組裝時防止絕緣 26 312/發明說明書(補件)/92-06/92107264 200400317 體從圍板脫落，可進一步提升組裝性。 【圖式簡單說明】 圖1爲摩托車型機車的側視圖。 · 圖2爲省略車體罩殻及收納箱的狀態時的摩托車型機車 · 的中間部的立體圖。 圖3爲沿著圖1中之3 - 3線所作的放大剖面圖。 圖4爲沿著圖3中之箭頭4所作的箭視圖。 圖5爲沿著圖3中之箭頭5所作的箭視圖。 圖6爲沿著圖3中之6 - 6線所作的剖面圖。 鲁 圖7爲從汽缸頭側看頭蓋時的圖。 圖8爲沿著圖7中之8 - 8線所作的剖面圖。 圖9爲沿著圖6中之9 - 9線所作的放大剖面圖。 圖1 〇爲沿著圖9中之1 〇 -1 〇線所作的剖面圖。 圖1 1爲沿著圖4中之1 1 -1 1線所作的剖面圖。 圖1 2爲沿著圖5中之1 2 -1 2線所作的放大剖面圖。 圖1 3爲沿著圖5中之1 3 -1 3線所作的剖面圖。 圖1 4爲沿著圖2中之1 4 -1 4線所作的放大剖面圖。 鲁 圖1 5爲沿著圖1 4中之1 5 -1 5線所作的剖面圖。 圖1 6爲沿著圖1 4中之1 6 -1 6線所作的剖面圖。 圖1 7爲沿著圖1 4中之1 7 -1 7線所作的剖面圖。 (元件符號說明） C 汽缸軸線 ‘ E 引擎 Μ 無段變速機 27 312/發明說明書(補件)/92-06/92107264 200400317 p 動力單元 S 間隔 T 厚度 WR 後輪 WF 前輪 25 車體框架 26 頭管 27 主架管 27a 下降框架部 27b 低框架部 28 橫跨管 29 後架管 29a 斜升框架部 2 9b 上部框架部 30 後架管 3〇a 斜升框架部 3〇b 上部框架部 3 1 前叉 3 2 方向操縱把手 33 連桿機構 34 引擎本體 3 5 曲柄箱 35a 箱體部 35b 箱體部 28200400317 玖, Description of the invention [Technical field to which the invention belongs] The present invention relates to a suction connection structure of a forced air-cooled engine, The cylinder head covered by the surrounding board is provided with a mounting surface for opening the suction port, An insulation body is interposed on the mounting surface to fix the input pipe. [Prior art] In the past, Zhou Zhiru has disclosed the above-mentioned structure in Japanese Patent Application Laid-Open No. 1 1 to 08 8 187 and the like. [Summary] (Problems to be Solved by the Invention) In the above conventional structure, There are insertion holes through which the input tube is inserted into the enclosure board, The input pipe system holds the input pipe and the insulator, At the same time, fasten the bolts inserted into the flange of the input pipe and the insulator, It is fastened to the mounting surface of the cylinder head. to this end, When bolts are inserted through the flanges and insulators, The screw holes on the mounting surface side will be covered by the flanges and insulators. Therefore, it is difficult to say that it is excellent in assemblability. The present invention is made in view of the above circumstances, The object is to provide a suction connection structure of a forced air-cooled engine that can improve assemblability. (Means for solving the problem) To achieve the above purpose, Apply for an invention in the first scope of patents, The cylinder head covered by the surrounding board is provided with a mounting surface for opening the suction port, In the suction connection structure of the forced air-cooled engine in which an insulator is fixed on the mounting surface and the input pipe is fixed, Its characteristics are: Fitting, Position the opening of the insulator. 5 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 According to the constitution of the first invention in the scope of patent application as mentioned above, Because the insulator is positioned and held on the enclosure board by fitting into the opening, and, The insulator functions to guide the bolts screwed into the screw holes provided on the mounting surface of the cylinder head. therefore, Easy screwing of bolts to the screw holes, Fasten, As a result, assemblability can be improved. In addition, Apply for an invention in the 2nd patent area, Adding the constitution of the invention in the first patent scope mentioned above, Its characteristics are: Forming an air outlet between a partial inner surface of the opening portion provided on the enclosure board made of synthetic resin and a partial side surface of the insulator, According to the constitution as described above, The warm air discharged from the exhaust port is used to warm the input pipe. Can improve warm-up performance, and, The mold part for forming the opening part when forming the panel, It is set to have a larger size so as to increase the strength so as to include a portion corresponding to the exhaust vent, This can increase the life of the mold. also, Apply for an invention in item 3 of the patent scope, The constitution of the invention in the second patent application range is added, Its characteristics are: The thickness T of the insulator is set to be larger than the interval between the mounting surface and the surrounding board. According to the constitution as described above, Fit the insulator to the opening so as to press against the mounting surface, It can prevent the insulator from falling off the enclosure during assembly, Can further improve assemblability. [Embodiment] The following, Referring to one embodiment of the present invention shown in the accompanying drawings, An embodiment of the present invention will be described. 1 to 17 show one embodiment of the present invention, Figure 1 is a side view of a motorcycle-type locomotive. FIG. 2 is a perspective view of a middle portion of a motorcycle-type locomotive when the body cover and the storage box are omitted. Figure 3 is an enlarged sectional view taken along line 3-3 in Figure 1, FIG. 4 is an arrow view taken along the head 4 in FIG. 3, Head 5 is an arrow view taken along arrow 5 in FIG. 3, FIG. 6 is a sectional view taken along line -6 in FIG. 3, Fig. 7 is a view when the head cover is viewed from the head side of the cylinder, Fig. 8 is a view taken along line 8-8 in Fig. 7 [J, FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 9 ′ FIG. 11 is a cross-sectional view taken along line 1 1-11 in FIG. 4, Fig. 12 is an enlarged sectional view taken along line 1 2-1 2 in Fig. 5, FIG. 13 is a cross-sectional view taken along line 1 3-1 3 in FIG. 5, Figure 14 is an enlarged sectional view taken along line 1 4-1 4 in Figure 2, Figure 15 is a cross-sectional view taken along line 15-15 in Figure 14 'Figure 16 is a cross-sectional view taken along line 16-16 in Figure 14' Figure 17 is taken along Fig. 14 is a sectional view taken on line 1 7-1 7. First of all, In Figures 1 and 2, The body frame 25 of a motorcycle-type locomotive includes: The main frame tube 27 whose front end is fixed to the head tube 26, Crossing pipes 2 8 fixed to the rear end of the main frame pipe 2 7 at a right angle, And the front ends are respectively connected to a pair of left and right rear frame tubes 29, The 30 ° main frame tube 27 is integrally provided with a lowering frame portion 27a, which is inclined from the head tube 26 toward the lower back. And a low frame portion 27b extending substantially horizontally from the rear end of the lowering frame portion 27a to the rear. In addition, Left and right rear rack tubes 29, 30, A diagonally rising frame portion 2 9 a, which extends from both ends of the spanning tube 28 to the upper and rearward direction, is integrally provided. 3 0 a, And from the ramp-up frame section 2 9 a, The rear end of 3 0 a extends approximately horizontally toward the rear, At the same time, the upper frame portions 2 9b which are curved in the horizontal plane so that the rear end openings face each other, 7 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 3 〇b. The head pipe 26 supports a front fork 3 1 on the front wheel WF in a steerable direction, An upper end of the front fork 31 is connected to a direction manipulation handle 3 2. The two rear frame tubes 29, 30 front, The front part of the power unit P which can swing up and down is supported by the link mechanism 3 3, A rear wheel WR arranged on the right side of the rear portion of the power unit P is pivotally supported on the rear portion of the power unit P. In Figures 3 to 6, The power unit P is a four-stroke engine E, a forced air-cooled single-cylinder, arranged in front of the rear wheels WR. And between the engine E and the aforementioned rear wheel WR, Is composed of a stepless transmission M. The engine body 34 of the engine E is equipped with a crank case 35, Cylinder block 3 6 combined with crank case 3 5, Cylinder head 3 7 combined with cylinder block 3 6 on the opposite side of crank case 3 5 and head cover 3 8 combined with cylinder head 3 7 on the opposite side of cylinder block 3 6, And two rear rack pipes 2 9 arranged in the body frame 25 30 people, The cylinder head 3 7 series is arranged in the two rear frame pipes 2 9 、 3 0 Inclined frame part at the front 2 9 a, 3 0 a lower part. The cylinder block 36 is formed along an axis of a cylinder cavity 39 provided in the cylinder block 36. That is, the cylinder axis C is arranged in such a manner that it tilts slightly forward and upward along the front-rear direction of the locomotive, so that A combustion chamber 41 is formed between the cylinder head 37 and the piston 40 slidably fitted in the cylinder cavity 39 described above. In addition, Piston 4 0 is connected by connecting rod 4 2 and crank pin 4 3, The crank shaft 44 has a rotation axis parallel to the rotation axis of the rear wheel WR. The crankshaft 44 is composed of the cylinder axis C, A pair of box portions 3 5 a, which are simultaneously combined by a plane perpendicular to the axis of the crank shaft 44 3 5b Structure 8 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 The crank case 3 5 is supported as a box member 3 5 a and the crank shaft 4 4 The first ball bearing 4 5 is interposed. And a second ball bearing 4 6 is interposed between the box member 3 5 b and the crank shaft 4 4 at the other end, and an intake port 47 which can communicate with the combustion chamber 41 1 is provided on the upper side of the cylinder head 37 An exhaust port 48 capable of communicating with the combustion chamber 41 is provided on a lower side surface of the cylinder head 37. The intake valve 49 and the exhaust valve 50 are used to open and close the suction port 4 7 and the exhaust port 4 8 respectively. It is arranged on the cylinder head 37 so as to be arranged in a slightly V shape on a projection view of a plane perpendicular to the rotation axis of the crank shaft 44. Potential energy is applied in the directions of closing the air inlet 47 and the air outlet 48, respectively. In addition, The spark plug 5 1 facing the combustion chamber 4 1 is mounted on at least one of the left and right end sides of the cylinder head 37. In this embodiment, it is mounted on the right side in a state facing forward in the traveling direction of the locomotive. Between the cylinder head 37 and the head cover 38, A valve operating mechanism 52 that opens and closes the intake valve 49 and the exhaust valve 50 is housed. The moving valve mechanism 52 includes: It has an axis parallel to the axis of the crank shaft 44 and is rotatably supported by the cylinder head 37, Both suction and exhaust cams 54, 53 of the camshaft 5 5; Having an axis parallel to the camshaft 55, And it is supported on the suction side and exhaust side of the cylinder head 3 7 5 6 5 7; The suction-side rocker arm 5 8 supported on the suction-side rocker shaft 5 6 can be shaken freely by driving the suction valve 49 in accordance with the above-mentioned suction cam 54; The exhaust-side rocker arm 59 supported on the exhaust-side rocker shaft 5 7 can be swingably supported by opening and closing the exhaust valve 50 in response to the exhaust cam 53. A driven sprocket 60 is fixed to one end portion of the cam shaft 55. on the other hand, 9 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 The outer end side of the crank shaft 4 4 is more than the second ball bearing 4 6, The driving sprocket 61 is fixed at a position corresponding to the passive sprocket 60, Driven and passive sprocket 6 1. 6 0 is rolled up with a seamless cam chain 6 2 ， The cam chain 6 2 series is stored so that it can pass along the cylinder block 3 6, The storage chamber 6 3 formed by the cylinder head 37 and the head cover 3 8 travels inside. With such a drive sprocket 6 1, Passive sprocket 6 0 and cam chain 6 2 ， The camshaft 5 5 is rotationally driven by half the number of rotations of the crank shaft 4 4. On the outer end side than the first ball bearing 45, A driving gear 64 is fixed to the crank shaft 4 4, The oil pump 6 6 ′ attached to the crank case 3 5 is sucked from the lower part of the lubricating oil storage part 65 formed in the crank case 3 5 through the lubricating oil filter 7 9. 6 4 driven. A part of the lubricating oil discharged from the oil pump 66 is used to lubricate the valve mechanism 52, In the crank case 35, Cylinder block 36, The cylinder head 37 and the head cover 38 are provided with a lubricating oil supply path 67 for guiding the lubricating oil from the oil pump 66 to the moving valve mechanism 52. and, In the cylinder head 37, And a lubricating oil supply path 67 is arranged at a position closer to the suction port 47 than the exhaust port 48, In this embodiment, On a projection of a plane perpendicular to the axis of the crank shaft 44, A lubricating oil supply path 67 is arranged at a position crossing the intake port 47. Referring to FIG. 7 and FIG. 8, The downstream end of the lubricating oil supply path 67, The circulation groove 6 8 is provided on the joint surface of the head cover 3 8 and the cylinder head 37 so that the lubricating oil from the cylinder head 37 side is supplied to one end. And a bottomed flow hole 6 9 connected to the other end of the circulation groove 6 8 and provided on the side wall of the head cover 3 8, A discharge hole 70 'at the inner end portion of the communication flow hole 69 is provided on the inner surface of the side wall of the head cover 38 so as to discharge the lubricating oil toward the moving valve mechanism 52. 10 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 In addition, The head cover 3 8 is provided with a bottomed detection hole 7 1 that communicates with one end of the flow groove 6 8. Simultaneously, At a position corresponding to the detection hole 7 丨, a mounting hub 72 protruding from the outside of the head cover 38 toward the outside is integrally provided. A temperature detector 7 3 is mounted on the mounting hub 7 2 so that the detection element portion 7 3 a protrudes into the detection hole 71. In other words, The temperature detector 7 3 is attached to the head cover 38 of the engine body 34 so that the detection element portion 73a faces the lubricating oil supply path 67. Notice in Figure 3, On the outer end side of the drive gear 64, It is provided with a stator 74 fixed to the crank case 35, A generator 76 of an outer rotor 75 fixed to a crank shaft 44 so as to surround the stator 74, At the outer end of the generator 76, A fan 77 is fixed to the crank shaft 44. The fan 77 is integrally provided by a plurality of, for example, 4 bolts 7 7 8 ... a plurality of blades 77b fastened to the outer peripheral portion of the base portion 77a of the outer rotor 75 of the power generator 76, 7 7 b ... the constituents. At least the cylinder block 36 and the cylinder head 37 in the engine body 34 Part of the crank case 35 in this embodiment, Cylinder block 3 6, The cylinder head 3 7 is covered by a surrounding plate 8 2. The flow path 81 formed between the engine body 34 and the enclosure 82, Air for forced air cooling discharged from the fan 7 7 is circulated. and, Outside the cylinder block 3 6 and the cylinder head 3 7, In order to enable effective cooling by the cooling air flowing through the flow path 8 1, A plurality of cooling fins 36a ... 37a ... The above-mentioned enclosure plate 82 is composed of a pair of upper and lower cover members that are coupled to each other so as to cover the cylinder block 36 and the cylinder head 37 in a cooperative manner. 8 4 and a part covering the crank case 35 and combined with the two cover members 83, 84 11 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 The upper cover member 83, Lower I-piece 84 and fan cover 85, They are each made of synthetic resin. The upper cover member 83 is provided with a plurality of engaging claws 87 protruding from the lower cover member 84 surface 86 to the lower cover member 84 side. The cover member 84 is elastically engaged with each of the above-mentioned engagements. Claw 8 7 ... Zhuangbei 88 ... In addition, The upper and lower cover members 83, 84 minutes, and a plurality of fastened portions 8 9 abutted on each other by the joint surface 8 6 are provided. 89 to be fastened to each other ... 90 ... is fastened by 91 ... in this way, For the elastic engagement of the engaging portions 8 8... Of the engaging claws 8 7... The tightening of the screw part 91 ... of 90 ... Lower cover member 83, 84 combined with each other, then, Head cover 38 from _ lower cover member 83, 84 protrudes toward the front side. The fan cover 8 5 is fastened to the box member 35 a so as to cover a part of the box member 3 5 fan 77 of the crank case 35. And is fastened to the above upper and lower cover members 83, by a plurality of screws 92 ... 84. The fan cover 85, A suction port 94 for sucking air from the outside toward the fan 77 side so as to correspond to the outside of the fan 77, A heat radiation window 95 is provided on the suction port 93. The heat radiation window 95 is composed of a plurality of 5 ring parts 95a ~ 95d, And a plurality of connecting portions 95e extending radially and connecting and attracting each ring portion 95a to 95d, At one of these connecting parts 9 5 e ... The timing of aligning the phase of the crankshaft 44 outside the fan cover 85 with a triangular shape, for example, is 312 / Invention Specification (Supplement) / 92-06 / 92107264 i. Bottom) Tie 丨 Bu Ti 9 0 ... Mutual solidarity, The upper part and the upper part and the a and the wind wire parts are provided with a shape 93, such as odd 94, and a mark 12 200400317 9 6 is indicated on the corresponding surface. The timing mark 9 6 is for a time user such as for ignition, By using a plurality of means for fixing the fan 77 to the crank shaft 44, For example, one of the four bolts 78 ... Positioned at the connecting portion 9 5 e corresponding to the timing mark 9 6 in the above-mentioned heat radiation window 95, That is, the phase matching of the time for ignition can be easily performed. also, The above timing marks 9 6 are not only used for time alignment for ignition, It can also be used for time alignment of TDC and BDC. In addition, When the moving valve mechanism 52 is configured to change the operating characteristics of at least one of the intake valve 49 and the exhaust valve 50, It can also be used for time alignment whose operating characteristics are changed. Referring to FIG. 9 and FIG. 10, A flat mounting surface 97 is provided on the upper side of the cylinder head 37 to open the air inlet 47. An insulator 99 is interposed on the mounting surface 97 and the lower end of the input pipe 98 is fastened. The lower end of the input pipe 98 is integrally provided with a flange portion 98a, The insulator 99 having the suction hole 100 communicating with the suction port 47 and the mounting surface 97 described above, The system is formed to have a shape corresponding to the flange portion 9 8 a. On both sides of the insulator 99, gaskets 101, 1〇2, among them, One washer 101 is mounted between the insulator 99 and the mounting surface 97, A washer 102 is mounted between the insulator 99 and the flange portion 98a. and, The thickness T of the insulator 99 is set to be larger than the interval S between the mounting surface 97 and the cover member 83 on the upper portion of the enclosure 82. On both sides of the suction port 4 7 The mounting surface 9 7 is provided with a bottom screw hole 103, 103, Bolts 104 inserted through the flange portion 98a and the insulator 99, 104 is fastened to each of the screw holes 103, 103, By tightening the bolts, 104, the input pipe 98 can be fastened to the mounting surface 97 through the insulator 99. but, In the enclosure 82 covering the cylinder head 37, Upper cover member 83 13 312 / Invention specification (Supplement) / 92-06 / 92107264 200400317 The opening 105 for the insulator 99 is positioned. The opening 105 is formed larger than the insulator 99 as shown in FIG. 10. Between the partial side surface of the opening portion 105 and the partial side surface of the insulator 99, An air exhaust port 106 for cooling air from passing through the flow path 81 to the outside is formed. The upstream end of the input pipe 98 is connected to the rear side of the input pipe 98 via a connection hose 107. The downstream end of the gasifier 1 08, The upstream end of the carburetor 108 is connected to an air cleaner 1 1 0 disposed on the left side of the rear wheel WR via a connection pipe 109. In Figure 11, The carburetor 108 is provided with a locomotive starter 1 1 1 which is electrically controlled based on the detection of the temperature detector 7 3. The locomotive starter 111 is configured to bypass a throttle valve (not shown) provided with the gasifier 108. Furthermore, the gasifier body 1 1 2 is installed on the gasifier body 1 12 so as to be opened and closed in the middle of the gasifier body 1 1 2 for starting. In the starting mixture gas passage 113, In a manner of being located on the upstream side of the locomotive starter 1 1 1, A gas release pipe 114 is fixed to the gasifier body 1 1 2 A fuel nozzle 1 1 5 which protrudes from a lower portion of the gas discharge pipe 1 1 4 is fixed to a lower portion of the gasifier body 112. In addition, A fuel tank 1 1 6 for storing fuel is fixed to a lower part of the gasifier body 1 1 2. The lower part of the fuel nozzle 1 1 5 protrudes into the fuel in the fuel tank 1 16. The locomotive starter 111 has a needle valve 1 1 7 which can be inserted into the downstream side of the exhaust pipe 114 freely forward and backward and is provided in the middle portion of the passage 1 1 3 for starting, The position of the needle valve 1 1 8 in the nozzle 1 1 7 is determined by the energization control of the locomotive starter 1 1 1. Thereby, the amount of start-up mixture gas flowing through the start-up 14 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 with the mixture gas passage 1 1 3 is determined. The upper and lower cover members 8 3 forming a part of the surrounding board 8 2 3 A fitting hole 120 is formed between the mating surfaces 86 of 8 4. and, The plug cap 121 connected to the Martian plug 51 is provided with an upper and a lower cover member 83 around the fitting hole 120, The outer crotch portion 121 a of 84 is fitted into the fitting hole 101. In addition, The above upper and lower cover members 8 3, 8 of 4 The upper cover member 83 is integrally provided with a shelter portion 1 2 2 covering the fitting portion of the plug cap 1 2 1 fitted into the fitting hole 120 from above. At the front end of the shelter 1 2 2, As shown in Figure 12, An anti-rotation positioning portion 1 2 a is formed to abut and engage the plug cap 1 2 1 so as to prevent the plug cap 1 2 1 from rotating around the axis of the Mars plug 51. The shelter portion 1 22 is a fitting hole 1 20 for covering the plug cap 1 2 1 in a posture that covers a part of the high-voltage cable 123 connected to the plug cap 121 and forward from the plug cap 121 to the front. Formed by the way of the fitting portion, The anti-rotation positioning portion 122a is a plug cap 1 2 1 which will increase the strength around the axis of the Mars plug 51 using the elastic force from the high-voltage cable 1 23. The shield 122 is formed to resist and accept the elastic force. Referring to Figure 1 3, The upper cover member 83 is integrally formed with a jig mounting base 125 continuously connected to the shelter portion 122, Utilizing the clamp 124 elastically mounted on the clamp mount 125, The cylindrical piezoelectric continuous wire 1 2 3 connected to the plug cap 121 is maintained. In addition, The engine body 34 is such that the cylinder head 37 is arranged on the left and right rear frame tubes 29, 30Front ramp frame 29a, 30a is supported on the vehicle body frame 25 in a lower part manner, The above-mentioned plug cap 121 is also disposed at the two oblique 15 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 Lifting frame portion 29a, The lower part of 30a, The upper part of the ramp frame part 30a on the right side of one of the two ramp frames is selected. As shown in FIG. One end is connected to the high-voltage cable end of the ignition induction coil 1 2 6 It is connected to the plug cap in a slightly U-shaped turn back from the direction of the above-mentioned bolt which is more closely connected to the rotation-preventing positioning portion 122a. Refer to FIG. 1 4 to FIG. The above upper board 8 2 is integrally provided, The front end portion has engaging protrusions 128a facing each other and facing out. 128a, Simultaneously, 1 * Yes cum from outside the upper cover 1 2 8 、 1 2 8; And linked between the above, Simultaneously, A pair of connecting walls 1 2 9 facing each other and from the upper cover member 8 3, 1 3 0, At the same time there are also such hooks connecting wall 1 2 9, A rectangular box surrounded by 1 3 0 [in two hooks 128, 128 engagement protrusion 128a, 128a, Wall 129, Between 130, Squeezed while overlapping, 128, 128 flexible long parts, This example wall 1 2 9 1 3 0 Supported long flexible parts inside the genus & And the outside is in contact with the two ligated protrusions l28a, 128 & The curved length part of the tube 134, It is sandwiched by the junction wall l28a. Between 1 3 0. The above-mentioned cable 133 has a soft plastic sheath and the connector 7 3, In addition, The tube made of a hard elastic material guides the ventilation gas and is connected to the head cover at 38 °. The above-mentioned hook 128 is connected by the full length of its base end 312 / Invention Specification (Supplement) / 92-06 / 92107264 Section 29a, 30a 2 expressly, The other 121 1 of the support 1 23 1 front 121 ° part of the cover member 8 3 close to each other of the side protrusion member 83 two, 128, 128 erected on the outside of 12 8 128 and, 13 1 ° Pan the above two links: Into the above two hooks, By connecting J cable 1 3 3, Belonging to the outside, 1 28a and two connected for temperature detection 1 3 4, It is used to provide the base portion 128b of the upper cover 16 200400317 member 83; And at a plurality of locations spaced apart along the length of the cable 133 and the tube 134, For example, two portions are connected to the substrate portion 128b, Simultaneously, A plurality of the above-mentioned engaging protrusions 128a are protruded at the front end, For example, two branch plate sections 1 2 8 c, 1 2 8 c, In two connected walls 1 2 9, Reinforcement wall supporting cables 1 3 3 between 1 3 0, Tied to each branch plate part 1 2 8 c, 1 2 8 c is connected to two hooks 1 2 8 、 Between 1 2 and 8. On the lower side of the cylinder head 37, which is not covered by the surrounding panel 82, The exhaust pipe 1 1 8 is connected so that the upstream end is connected to the exhaust port 48, An exhaust muffler 1 1 9 disposed on the right side of the rear wheel WR is connected to the downstream end of the exhaust pipe 1 1 8. Pay particular attention to Figures 3 and 4, A transmission case 1 3 6 extending from the left side of the rear wheel WR is connected to the crank case 35 in a forward direction in the traveling direction of the locomotive. The transmission box 1 3 6 is a box body 137 that is integrally connected to the above-mentioned crank box 3 5 and the box body 35 is extended to the rear; A first transmission chamber 140 is formed between the box body 137 and the left side cover 1 3 8 fastened to the box body 137 from the left side; And a right side cover 1 3 9 which forms a second transmission chamber 1 41 between the box body 1 3 7 and is fastened to a right rear portion of the box body 1 3 7. At the front of the box body 1 3 7 of the gearbox 1 3 6 A support arm 1 42 is protruded so as to be arranged on the side of the cylinder block 36 of the engine E. The support wrist 142 is rotatably supported on the vehicle body frame 25 via a link mechanism 33. The axles 1 4 3 of the rear wheel WR are rotatably supported by the rear part of the transmission case 1 3 7 and the right side cover 1 3 9. In addition, As shown in FIG. 1 'Between the rear portion of the box body 137 and the ramp frame 17 of the rack tube 29 behind the body frame 25/312 / Invention specification (Supplement) / 92-06 / 92107264 200400317 The rack portion 2 9 a After the buffer 1 4 4. The stepless speed changer M is a V-belt type that is stored in the first transmission room 140. A reduction gear set is provided between the stepless speed changer M and the axle 1 4 3. 145 ° The drive-side transmission pulley 1 46 connected to the end of the crank shaft 44 on the outside of the second ball bearing 46; A passive side drive pulley 1 4 having an axis parallel to the crank shaft 44 and mounted on a driven shaft 1 47 rotatably supported by a rear portion of the case body 1 3 7 and a right side cover 1 3 9 via a centrifugal clutch 148 9 ; And hanging on two transmission pulleys 1 4 6, 149 on the jointless triangle belt 150. The drive side transmission pulley 146 is a fixed pulley half 146a fixed to the crank shaft 44; And a movable pulley half 14 6b slidably mounted on the crank shaft 44. On the two pulley halves 146a, A V-shaped annular groove 1 5 1 is formed between 14 6b, A V-belt 150 is inserted into the annular groove 151. In addition, On the back side of the movable pulley half 146b, An inclined panel 152 is fixed to the crank shaft 44. A plurality of weight rollers 153 are housed in a floating state between the movable pulley half 146b and the inclined plate 152. As the number of rotations of the crank shaft 44 increases, The weight roller 1 5 3 subjected to the centrifugal force moves outward in the radial direction of the crank shaft 44, The movable pulley half 146b is brought closer to the fixed pulley half 146a. With this, The V-belt 150 for the two pulley halves 146a, The contact radius of 146b is increased. on the other hand, The passive side drive pulley 1 49 is equipped with, Connected to the passive shaft 147 via a centrifugal clutch 148, And is supported by the passive shaft 147 as a rotatable support cylinder 154; -Body fixed belt 18 312 formed in the support tube 154 / invention specification (supply) / 92-06 / 92107264 200400317 wheel half body 149a; And can approach or leave the fixed pulley half 149a, And is supported by the support tube 154, Simultaneously, A movable pulley half 149b which imparts elastic potential energy in a direction approaching the fixed pulley half 149a, In the two pulley halves 149a, A V-shaped annular groove 155 between 149b is inserted with a V-belt 150. and, As the contact radius of the movable belt pulley half 149b with the driving belt 146 of the V-belt 150 increases, The movable pulley half 149b moves in the axial direction such that the contact radius of the triangular belt 1 50 with respect to the driven-side drive pulley i 49 decreases, With this, A stepless speed change is performed between the crank shaft 44 and the driven shaft 147 in response to the rotation of the crank shaft 44. A cover 1 3 8 on the left side of the gearbox 1 3 6 can freely support the recoil shaft 156. A kick start pedal 157 is provided at the outer end of the recoil shaft 156 (see FIG. 1). In addition, On the inside of the left side cover 1 3 8 above, A recoil starter 158 is provided between the recoil shaft 156 and the crank shaft 44 to transmit the power of the recoil shaft 156 in response to the depression operation of the pedal start pedal 157 to the crank shaft 44. The reduction gear set 94 is disposed between the driven shaft 147 and the axle 143 and is accommodated in the second transmission room 1 4 1. The rotation power of the passive shaft 1 4 7 of the stepless speed changer M is transmitted to the axle of the rear wheel WR by the reduction gear set 94 after deceleration 143 ° However, Two rear rack tubes 2 in the body frame 2 5 9 3 0 in the front, A storage box 160 that can store a helmet and the like is arranged on the engine E, In the two rear rack tubes 29, The rear section of the 30 supports a fuel tank 161. In addition, In the two rear rack tubes 29, The front part of the upper frame part 29b of the rear frame pipe 29 on the left side of the 30 supports the exhaust port 48 of the engine E which can be cleaned and supplied. Air filter 162 for secondary air. The suction port of the air filter 1 62 for the secondary air is connected to the downstream end of the suction pipe 1 6 3, The downstream end of the suction pipe 163 is inserted into two rear frame pipes 29, The rear end portion of the upper frame portion 3 Ob of the right rear frame pipe 30 in the middle of 30. A secondary air control valve 164 provided between the engine E and the secondary air filter 1 62, It is supported by the stay 165 of the diagonally rising frame part 29a attached to the left rear frame pipe 29. In addition, A connection pipe portion 166 communicating with the inside of the diagonally rising frame portion 29a is provided at a lower portion of the diagonally rising frame portion 29a of the left rear frame pipe 29, On the other hand, a ventilation pipe 167 for cooling air which is led out from the stepless speed changer M of the power unit P is connected to the connection pipe portion 166 described above. Body frame 25, Is covered by a synthetic resin body shell 168, The body shell cover 168 has: Foot guard 169 covering the front of the driver's feet; A pedal 17 0 connected to the lower part of the foot guard 1 69 for placing the foot of the rider; And a side cover 171 connected to the pedal 170 and covering the rear of the vehicle body from both sides. The side cover 1 7 1 is provided with a seat 1 7 2 that can open and close the storage box 1 60 and the fuel tank 1 6 1 from above. the following, Describe the effect of this embodiment, On the crank case 35 of the engine body 34, An oil pump 6 6 which sucks up lubricating oil from the lubricating oil storage portion 65 in the crank case 35 is installed, And the lubrication oil supply path 67 which guides the lubricating oil of the moving valve mechanism 52 is guided, It is connected to the oil pump 66 and installed in the crank case 3 5. Cylinder block 3 6, Cylinder head 3 7 and head cover 3 8 The temperature detector 7 3 is mounted on the engine body 34 with its detection element portion 7 3 a facing the lubricant supply passage 67. 20 312 / Invention Manual (Supplement) / 92-06 / 92107264 200400317 In the lubricating oil supply passage 6 7 for guiding the lubricating valve mechanism 5 2 and the lubricating oil discharged from the oil pump 6 6, As long as the engine is running, it is filled with lubricating oil regardless of the running state and posture. As mentioned above, By arranging the detection element portion 73a of the temperature detector 73 so as to face the lubricant supply passage 67, That is, it is extremely susceptible to changes in the operating state and posture of the engine E. Engine temperature is often detected well and quickly, and, The temperature detector 73 does not require other complicated structures for detecting the temperature of the lubricating oil. and, Because the lubricating oil supply passage 67 is arranged in the cylinder head 37 in a position closer to the suction port 47 than the exhaust port 48, therefore, Extremely susceptible to the influence of heat radiation from the environment of the outer surface portion of the engine body 34, Even during low rotation (idling state) after engine E starts, The engine temperature is still well detected, Engine temperature is often detected well and quickly. Because the engine E is provided with air-cooling cooling fins 36a, ... on the cylinder block 36 and the cylinder head 37, The method of 3 7a ... is constituted as a forced air-cooled type, And The temperature detector 73 is mounted on the head cover 38 without an air cooling fan. therefore, That is, the cooling fins 36a ... 3 7a ... can accurately detect the engine temperature, and, The structure for mounting the temperature detector 73 is also simplified. In addition, On the gasifier 108 connected to the above-mentioned suction port 47, A locomotive starter 1 1 1 is installed to open and close the starting mixed gas passage 1 1 3 provided in the gasifier 1 08 based on the detection of the temperature detector 73, therefore, Based on the engine temperature correctly detected by the temperature detector 73, Optimizing the mixture supplied to engine E at start-up, Thereby, the warm-up performance of the engine 21 312 / invention specification (supplement) / 92-06 / 92107264 200400317 E can be improved. In addition, Cylinder block 36 and cylinder head 3 7, It is covered by a surrounding plate 8 2 formed between the cylinder block 36 and the cylinder head 3 7 for the air-circulated flow path 8 1 for forced air cooling. A temperature detector 73 is mounted on the head cover 38 in a manner not affected by the cooling air of the forced air supply, Even when it is a forced air cooling engine, It also detects the engine temperature correctly. Although on the side of the upper part of the cylinder head 3 7 There is a flat mounting surface 97 for opening the suction ports 47. The mounting surface 97 is fastened to the input pipe 98 via an insulator 99, but, The upper cover member 83 of the enclosure 82 is provided with a fitting, Position the opening 105 of the insulator 99. Accordingly, The insulator 9 9 is positioned and held by the enclosure 8 2 by being fitted to the opening portion 105. and, The insulator 9 9 functions to guide the screw holes 1 0 3... Which are screwed into the mounting surface 97 of the cylinder head 3 7. Therefore, it is easy to screw the bolts 1 0 4… to the screw holes 1 0 3… Fasten, As a result, assemblability can be improved. In addition, The exhaust vent 106 is formed between a part of the inner side surface of the opening portion 105 provided on the upper cover member 83 made of synthetic resin and a part of the side surface of the insulator 99. therefore, The warm air discharged from the exhaust port 106 is used to warm the input pipe 98, Can improve warm-up performance. and, When the upper cover member 83 is formed, a mold portion for forming the opening 105 is formed. It is set to be relatively large in order to include a part corresponding to the above-mentioned exhaust vent 106 in order to increase the strength, This can increase the life of the mold. also, Since the thickness T of the insulator is set to be larger than the interval S between the mounting surface 97 and the surrounding plate 82, therefore, Fit the insulator 99 to the opening 105 by pressing 22 312 / Invention Manual (Supplement) / 92-06 / 92107264 200400317 against the mounting surface 9 7 That is to prevent the insulator 99 from falling off the enclosure 82 during assembly, Can further improve assembly. In addition, The plug cap 1 2 1 and the ignition induction coil 1 2 6 connected to the spark plug 5 1 mounted on the right side of the cylinder head 3 7, They are connected by high voltage cables 1 2 3, but, The ignition coil 1 26 is supported on the right rear frame pipe 30 in a manner positioned behind the cylinder head 37. One end is connected to the other end of the high-voltage cable 1 2 3 of the ignition induction coil 1 2 6, It is folded back in a U-shape from the front direction of the plug cap 1 2 1 toward the rear and connected to the plug cap 121. Accordingly, The high-voltage cable 1 2 3 connected to the plug cap 1 2 1 Becomes forward from this plug cap 121, Even if the plug cap 121 and the vehicle body frame 2 5 are frame members disposed outside the plug cap 1 2 1, That is, the distance from the right rear frame pipe 30 becomes narrower, Interference with the body frame 25 can still be avoided, And it can increase the degree of freedom of arranging high-voltage cables 1 2 3, Simultaneously, Set the bending radius of the high-voltage cable 1 2 3 large, It can improve the durability of high voltage cables 1 2 3. The shroud 82 is provided so as to cover the cylinder block 36 and the cylinder head 37 in a coordinated manner. The upper and lower pair of upper and lower cover members combined with each other 8 3, 8 4 of them, The fitting hole 1 2 0 for the plug cap 1 2 1 which is connected to the right side of the cylinder head 3 7 is fitted to the spark plug 5 1, Formed on both cover members 83, 84 mating surfaces 86. and, The upper cover member 83 is integrally provided with a shield portion 122 covering the fitting portion of the plug cap 121 fitted into the fitting hole 120 from above. Using the elastic force from the high-voltage cable i 23 to increase the plug cap 1 around the axis of the Mars plug 51 1 Abut against the elastic force and bear the plug cap 1 2 1 Attached to the asylum section 23 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 1 2 2 The rotation stop positioning section 1 2 2 a. In other words, The plug cap 1 2 1 is connected with the elastic force from the high-voltage cable 1 23. Is attached to the rotation prevention position 122a formed on the asylum portion 1 22, therefore, Can prevent the plug cap 121 from rotating around the axis of Mars while the engine is running, With this, In order to prevent the high-voltage cable 1 2 3 from vibrating, it can effectively prevent the high-voltage cable 1 23 from contacting with other parts. and, The shield portion 122 covers the fitting portion of the fitting hole 120 of the plug cap 121 from above, therefore, Prevents contact and falls on components higher than the main body 34, For example, muddy water in the storage box 1 60 is connected to the high-voltage cable 123 and the plug cap 1 2 1. In addition, A clamp 124 holding a high-voltage cable 123, It is attached to the above-mentioned shelter 122 and is formed on the jig safety 1 2 5 of the upper cover member 83, therefore, By keeping the high-voltage cable theft near the plug cap 1 2 1 Can more effectively prevent the vibration of high-voltage cables 1 23 The strength of the shelter 122 can be increased by the clamp mounting seat 125. In addition, The upper cover member 83 of the enclosure 82 is integrally provided, Front has engaging protrusions facing each other and protruding toward each other's approaching side 1 2 8 a, 1 2 8 a, Simultaneously, Hooks 1 2 8 erected from the outside of the upper cover member 8 3, 1 2 8; And connected to the two hooks 1 2 8 1 2 8 rooms, At the same time, a pair of couplings facing each other and rising from the outside of the upper cover member 83 129, 130, At the same time there are also such hooks 128, The right-angled quadrangular through-holes 1 3 1 surrounded by 128 and the connecting wall 1 3 0. On two hooks 128, 128 engagement protrusion 128a, 128a and the above two walls 129, Between 130, Overlapping each other and being pressed into the two hooks described above 312 / Invention Manual (Supplement) / 92-06 / 92107264 Embedding Engine written by Lou Xu, Block I ^ 123, This pair of ends, Phase § 129, Link 128, 24 200400317 1 2 8 cable 1 3 3 and tube 1 3 4. Accordingly, When molding the upper cover member 83 made of synthetic resin, A pair of hooks 128, 128 and a pair of connecting walls 1 29, 1 3 0, Even if parts other than the upper cover member 83 provided in the locomotive are not used, Can still be two hooks 1 2 8, 1 2 8 and two connecting walls 129, 130 stably supports cable 133 and tube 134, Therefore, the number of parts and the number of assembly operations can be reduced. Simultaneously, The cable 1 3 3 and the tube 1 3 4 can be stably supported on the flat surface of the upper cover member 8 3. and, The through holes 1 3 1 are covered by overlapping cables 1 3 3 and tubes 1 3 4. When the cables 1 3 3 and the tubes 1 3 4 are supported, the inside of the upper cover member 8 3 cannot be seen through the through-holes 1 3 1. That is, within the enclosure board 8 2. In other words, The through-holes 1 3 1 are covered by the cables 1 3 3 and the tubes 1 34 which are stacked on each other. By preventing the cooling air from leaking from the enclosure 82 to stably maintain the cooling performance of the forced air-cooled engine E, At the same time, the cable 82 can support the cables 1 3 3 and the tubes 1 3 4 and, It can prevent the cooling air from leaking from the through holes 1 3 1 therefore, It is possible to prevent the appearance from being deteriorated so that dust is not sprayed on the outer surface side of the enclosure 82. The above-mentioned cable 1 3 3 has a soft plastic sheath and is connected to the temperature detector 7 3, In addition, The tubes 1 3 4 are made of a hard elastic material, Connected to the head cover 3 8 for guiding the ventilation gas, Make the plastic sheath on the outside of the cable 1 3 3 fully close to the two connecting walls 1 2 9 1 3 0, Simultaneously, Used on the outside of the tube 1 3 4 is indeed tied with two hooks 128, The engaging protrusion 128a at the front end of 128, 128a, That is, the cable 133 and the tube 134 can be more surely supported. and, The above-mentioned hook 1 2 8 is connected to the upper cover body 25 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 member 8 3 by the full length of its base end portion 1 2 8 b; And a plurality of locations spaced apart along the length of the cable 1 3 3 and the pipe 1 3 4, For example, two portions are connected to the substrate portion 128b, Simultaneously, A plurality of the engaging protrusions 128a · are projected at the front end, For example, two branch plate sections 1 2 8 c, 1 2 8 c, In two, Connecting wall 1 2 9, Reinforcement wall supporting cables 1 3 3 between 1 3 0, Tied to each branch plate 1 2 8 c, 1 2 8 c is connected to two hooks 1 2 8 、 Between 1 2 and 8. to this end, By supporting the inner cable 1 3 3 with the reinforcing wall 1 3 2, Can support the cable 1 3 3 and the tube 1 3 4 more stably, Simultaneously, With the reinforcement wall 132, two hooks 128, 128 strength. Repair above, Explained the embodiment of the present invention, but, The present invention is not limited to the above embodiments. As long as the scope of the present invention described in the scope of patent application is not exceeded, Various design changes can be made. (Effects of the Invention) As described above, According to the invention in the first patent application scope, By fitting the insulator to the opening so that the insulator is positioned and held on the enclosure, and, It is easy to screw the bolts into the screw holes, Fasten, This improves assembly. Φ In addition, According to the invention in scope 2 of the patent application, Use the warm air from the exhaust vent to warm the input pipe, Can improve warm-up performance, and, The mold part for forming the opening part during the molding of the enclosure board, It is set to have a larger size so as to increase the strength so as to include a part corresponding to the exhaust vent, ^ It can increase the life of the mold. · In addition, According to the invention in the third patent application scope, Fit the insulator to the opening so as to press against the mounting surface, It can prevent the insulation during assembly 26 312 / Invention Specification (Supplement) / 92-06 / 92107264 200400317 Can further improve assembly. [Brief description of the drawings] FIG. 1 is a side view of a motorcycle-type locomotive. Fig. 2 is a perspective view of a middle portion of the motorcycle-type locomotive when the body cover and the storage box are omitted. FIG. 3 is an enlarged sectional view taken along line 3-3 in FIG. 1. FIG. 4 is an arrow view taken along arrow 4 in FIG. 3. FIG. 5 is an arrow view taken along arrow 5 in FIG. 3. FIG. 6 is a sectional view taken along line 6-6 in FIG. 3. Fig. 7 is a view when the head cover is viewed from the cylinder head side. FIG. 8 is a sectional view taken along line 8-8 in FIG. 7. FIG. FIG. 9 is an enlarged sectional view taken along line 9-9 in FIG. 6. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. FIG. 11 is a cross-sectional view taken along line 1 1-1 11 in FIG. 4. FIG. 12 is an enlarged sectional view taken along line 1 2-12 in FIG. 5. FIG. 13 is a sectional view taken along line 1 3-13 in FIG. 5. FIG. 14 is an enlarged cross-sectional view taken along line 1 4-14 in FIG. 2. Fig. 15 is a cross-sectional view taken along line 15-15 in Fig. 14. FIG. 16 is a cross-sectional view taken along line 16-16 in FIG. 14. FIG. 17 is a cross-sectional view taken along line 17-17 in FIG. 14. (Description of component symbols) C Cylinder axis' E Engine M Stepless transmission 27 312 / Invention manual (Supplement) / 92-06 / 92107264 200400317 p Power unit S Interval T Thickness WR Rear wheel WF Front wheel 25 Body frame 26 head Tube 27 Main frame tube 27a Lowering frame portion 27b Low frame portion 28 Crossing tube 29 Rear frame tube 29a Inclined frame portion 2 9b Upper frame portion 30 Rear frame tube 30a Inclined frame portion 30b Upper frame portion 3 1 Front fork 3 2 Directional handle 33 Link mechanism 34 Engine body 3 5 Crank box 35a Box body portion 35b Box body portion 28
312/發明說明書(補件)/92-06/92107264 200400317 36 汽缸塊 3 6a 冷卻鰭片 37 汽缸頭 37a 冷卻鰭片 38 頭蓋 39 汽缸腔 40 活塞 4 1 燃燒室 4 2 連桿 43 曲柄銷 44 曲柄軸 4 5 第1滾珠軸承 46 第2滾珠軸承 4 7 吸氣口 48 排氣口 4 9 吸氣閥 50 排氣閥 5 1 火星塞 52 動閥機構 53 吸氣用 54 排氣用凸輪 5 5 凸輪軸 56 搖軸 57 搖軸 29312 / Inventory (Supplement) / 92-06 / 92107264 200400317 36 Cylinder block 3 6a Cooling fin 37 Cylinder head 37a Cooling fin 38 Head cover 39 Cylinder cavity 40 Piston 4 1 Combustion chamber 4 2 Connecting rod 43 Crank pin 44 Crank Shaft 4 5 1st ball bearing 46 2nd ball bearing 4 7 Intake port 48 Exhaust port 4 9 Intake valve 50 Exhaust valve 5 1 Martian plug 52 Actuating mechanism 53 Intake 54 Exhaust cam 5 5 Cam Shaft 56 Shaft 57 Shaft 29
312/發明說明書(補件)/92-06/92107264 200400317 5 8 吸 氣 側 搖 臂 59 排 氣 側 搖 臂 60 被 動 鏈 輪 6 1 驅 動 鏈 輪 62 凸 輪 鏈 條 63 收 納 室 64 驅 動 國 輪 65 潤 滑 油 儲 積 部 66 油 泵 67 潤 滑 油 供 給 路 68 流 通 溝 69 流 通 孔 70 噴 出 孔 7 1 有 底 檢 測 孔 72 安 裝 轂 73 溫 度 檢 測 器 73a 檢 測 元 件 部 74 定 子 75 外 部 轉 子 76 發 電 機 77 風 扇 77a 基 部 77b 葉 片 78 螺 栓 312/發明說明書(補件)/92-06/92107264312 / Invention Manual (Supplement) / 92-06 / 92107264 200400317 5 8 Inlet side swing arm 59 Exhaust side swing arm 60 Passive sprocket 6 1 Drive sprocket 62 Cam chain 63 Storage compartment 64 Drive national gear 65 Lubricant Accumulation section 66 Oil pump 67 Lubricating oil supply path 68 Flow channel 69 Flow hole 70 Ejection hole 7 1 Bottom detection hole 72 Mounting hub 73 Temperature detector 73a Detection element section 74 Stator 75 External rotor 76 Generator 77 Fan 77a Base 77b Blade 78 Bolt 312 / Invention Manual (Supplement) / 92-06 / 92107264
30 200400317 79 潤 滑 油 過 濾 器 8 1 流 通 路 82 圍 板 83 上 部 罩 體 構 件 84 下 部 罩 體 構 件 85 風 扇 罩 86 接 合 面 87 繫 合 爪 88 繫 止 部 89 被 固 緊 部 90 被 固 緊 部 9 1 螺 絲 構 件 92 螺 絲 構 件 93 吸 引 □ 94 吸 引 筒 95 散 熱 窗 9 5 a〜 95d 環部 95e 連 結 部 96 定 時 標 誌 97 安 裝 面 98 輸 入 管 98a 凸 緣 部 99 絕 緣 體 100 吸 氣 孔 312/發明說明書(補件)/92-06/9210726430 200400317 79 Lubricating oil filter 8 1 Flow passage 82 Shroud 83 Upper cover member 84 Lower cover member 85 Fan cover 86 Joint surface 87 Engaging claw 88 Fastening portion 89 Fastened portion 90 Fastened portion 9 1 Screw member 92 Screw member 93 Suction □ 94 Suction tube 95 Radiating window 9 5 a to 95d Ring 95e Connecting portion 96 Timing mark 97 Mounting surface 98 Input tube 98a Flange portion 99 Insulator 100 Suction hole 312 / Invention manual (Supplementary ) / 92-06 / 92107264
31 200400317 10 1 墊圈 102 墊圈 103 螺絲孔 104 螺栓 105 開口部 106 排風口 107 連接管 10 8 氣化器 109 連接管道 11 0 空氣濾淨器 111 機車起動器 112 氣化器本體 113 起動用混合氣通路 114 放氣管 115 燃料噴嘴 116 燃料箱 117 噴嘴 118 針閥（參照圖11) 118 排氣管（參照圖1、6) 119 排氣消音器 120 嵌合孔 121 栓塞帽 1 2 1 a鍔部 122 庇護部 3231 200400317 10 1 Washer 102 Washer 103 Screw hole 104 Bolt 105 Opening 106 Exhaust port 107 Connecting pipe 10 8 Carburettor 109 Connecting pipe 11 0 Air filter 111 Locomotive starter 112 Carburetor body 113 Starter gas passage 114 Exhaust pipe 115 Fuel nozzle 116 Fuel tank 117 Nozzle 118 Needle valve (refer to Fig. 11) 118 Exhaust pipe (refer to Figs. 1 and 6) 119 Exhaust muffler 120 Fitting hole 121 Plug cap 1 2 1 锷 部 122 Shelter Department 32
312/發明說明書(補件)/92-06/92107264 200400317 122a 止 旋 定 位 部 123 高 壓 電 纜 線 124 夾 具 125 夾 具 安 裝 座 126 點 火 感 應 圈 128 鉤 128a 繫 合 突 部 128b 基 板 部 128c 分 歧 板 部 129 連 結 壁 130 連 結 壁 13 1 透 孔 132 補 強 壁 133 電 纜 線 134 管 136 傳 動 箱 13 7 箱 主 體 13 8 左 側 蓋 139 右 側 蓋 140 第 1 傳 動 室 14 1 第 2 傳 動 室 142 支 持 腕 部 143 車 軸 144 後 緩 衝 器 312/發明說明書(補件)/92-06/92107264 200400317 145 減速齒輪組 146 驅動側傳動皮帶輪 146a固定皮帶輪半體 146b可動皮帶輪半體 147 被動軸 14 8 離七、離合益 149 被動側傳動皮帶輪 149a固定皮帶輪半體 149b可動皮帶輪半體 150 三角皮帶 15 1 環狀溝 15 2 斜面板 15 3 重量輥 154 支持筒 155 環狀溝 15 6 反衝軸 157 腳蹬起動踏板 158 反衝式起動裝置 160 收納箱 161 燃料箱 162 二次空氣用空氣濾淨器 16 3 吸氣管 16 4 二次空氣控制閥 165 撐架 312/發明說明書(補件)/92-06/92107264 200400317 166 連接管部 167 通風管 168 合成樹脂製車體殻罩 169 護腳罩 170 踏板 171 側罩 172 蓋板 312/發明說明書(補件)/92-06/92107264312 / Invention Manual (Supplement) / 92-06 / 92107264 200400317 122a Rotation positioning part 123 High-voltage cable 124 Fixture 125 Fixture mount 126 Ignition induction ring 128 Hook 128a Coupling protrusion 128b Base plate portion 128c Branch plate portion 129 Connection Wall 130 Connecting wall 13 1 Through-hole 132 Reinforcing wall 133 Cable 134 Tube 136 Transmission box 13 7 Box body 13 8 Left side cover 139 Right side cover 140 First transmission room 14 1 Second transmission room 142 Supporting wrist 143 Axle 144 Rear buffer 312 / Invention Manual (Supplement) / 92-06 / 92107264 200400317 145 Reduction gear set 146 Drive-side transmission pulley 146a Fixed pulley half 146b Movable pulley half 147 Passive shaft 14 8 Clutch benefit 149 Passive-side drive pulley 149a fixed pulley half 149b movable pulley half 150 V-belt 15 1 annular groove 15 2 inclined plate 15 3 weight roller 154 support tube 155 annular groove 15 6 recoil shaft 157 kick start pedal 158 recoil starter 160 Storage box 161 Fuel tank 162 Air filter for secondary air 16 3 Suction pipe 16 4 Secondary air control valve 165 Bracket 312 / Invention manual (Supplement) / 92-06 / 92107264 200400317 166 Connecting pipe section 167 Ventilation pipe 168 Synthetic resin body Shell cover 169 Foot cover 170 Pedal 171 Side cover 172 Cover 312 / Invention manual (Supplement) / 92-06 / 92107264