200925046 九、發明說明 【發明所屬之技術領域】 本發明係關於小型車輛，其具有設有皮帶驅動式無段 變速器及腳踩起動機構之動力單元。 【先前技術】 設有皮帶驅動式無段變速器之機車及設有腳踩起動機 〇 構之動力單元係熟知如，例如，日本登錄實用新型第 25 1 3 407號的公報所揭示。 揭示於日本登錄實用新型第25 1 3407號之動力單元係 固定安裝在機車的車體架上。在動力單元的輸出軸所提供 之動力係經由鏈條以驅動運轉用機車來傳輸至支撐在後叉 的後端用於旋轉之後輪。 動力單元的皮帶驅動式無段變速器相對於機車的寬度 係配置在左側。驅動滑輪係安裝在引擎的曲軸的左部上， 且從動滑輪係配置在驅動滑輪的後側，及無端皮帶係延伸 在驅動及從動滑輪之間。輸出軸係配置在從動滑輪的的後 _ 側，且中間軸係配置在從動滑輪及輸出軸下方以在從動滑 輪軸提供之動力傳輸至輸出軸。 支撐含於腳踩起動機構的腳踩起動臂之腳踩起動軸係 配置在從動滑輪軸的前側以致不會將腳踩起動軸配置於從 動滑輪軸下方之空間，其中配置有中間軸。安裝在腳踩起 動軸上之驅動螺旋齒輪係與和從動滑輪軸同軸之從動螺旋 齒輪嚙合。從動螺旋齒輪及從動滑輪軸係藉由棘輪機構而 -4- 200925046 互鎖。動力係自從動滑輪軸經由無端皮帶傳輸至曲軸以起 動內燃機。 因此，腳踩起動軸相對於機車的寬度係配置在左側’ 皮帶驅動式無段變速器係配置在機車上。腳踩起動軸係支 撐在自左側覆蓋皮帶驅動式無段變速器之變速器蓋上。腳 踩起動軸係藉由復位彈簧朝向其原始位置而推動。 配置在從動滑輪軸的前側之腳踩起動軸係位在如從動 0 滑輪軸的實質相同高度以避免阻礙到無端皮帶之對應至動 力單元的實質縱向中間部之位置。因此，附接至腳踩起動 臂的自由端之腳踩起動踏板係位在前方高位置。 因爲腳踩起動機構係配置在動力單元的左側，皮帶驅 動式無段變速器亦配置在動力單元上，腳踩起動機構的齒 輪必須是乾式，且以機油潤滑齒輪係困難的。 本發明已依據前述問題而製作，因此本發明的目的在 於提供一種小型車輛，其具有促進腳踩起動操作之動力單 Ο 元及能夠以機油潤滑以減小摩擦損失以及改善耐久性之腳 踩起動機構。 【發明內容】 爲達到以上目的，本發明提供一種小型車輛，包含： 動力單元，其以整體組合方式包括設有橫向延伸的曲軸之 內燃機及皮帶驅動式無段變速器，皮帶驅動式無段變速器 設有延伸在與曲軸一起旋轉之驅動滑輪軸及從動滑輪軸之 間之無端皮帶，動力單元包括由從動滑輪軸所驅動之中間 -5- 200925046 軸及由中間軸所驅動之輸出軸；傳輸機構，用於自輸出軸 將動力傳輸至後輪；及車體架，其支撐動力單元：其中輸 出軸係配置在從動滑輪軸的後側；中間軸係配置在輸出軸 及從動滑輪軸的上側；支撐腳踩起動臂之腳踩起動軸係在 從動滑輪軸的下側平行於曲軸而延伸；及用於自腳踩起動 軸將動力傳輸至曲軸之腳踩起動機構係配置在相對於車輛 寬度方向與配置的皮帶驅動式無段變速器的側相反之側。 0 較佳地，該車體架包括頭管、自該頭管延伸以向後傾 斜之主架、及自該主架的後端部向下延伸且樞轉地支撐後 叉之樞轉托架；動力單元係自主架懸掛在樞轉托架的前側 且在主架下方之位置，且中間軸係位於主架及樞轉托架的 彎曲接合處的內角。 依據本發明，容納皮帶驅動式無段變速器之變速器殻 ，且變速器殼不會設在如自上方所示之主架下方。 較佳地，腳踩起動機構包括同軸地安裝在腳踩起動軸 ❹ 上之大腳踩起動驅動齒輪、同軸地安裝在曲軸上之腳踩起 動從動齒輪、及配置在大腳踩起動驅動齒輪及腳踩起動從 動齒輪之間的腳踩起動中間齒輪，復位彈簧係捲繞著腳踩 起動軸’且棘輪齒係與腳踩起動中間軸結合，該等腳踩起 動中間齒輪的幾個係安裝在腳踩起動中間軸上。 較佳地，該車體架包括自頭管延伸以向後傾斜之主架 :內燃機具有傾斜以向前升起之汽缸頭；自汽缸頭向上延 伸之吸氣管係配置在主架下方；曲軸相對於內燃機的汽缸 的中心軸係向上移位；及腳踩起動中間軸係位在曲軸的下 -6- 200925046 側。 較佳地，附接至腳踩起動臂的外端之腳踩起動踏板相 對於車輛寬度係位在動力單元的外側。 典型地，腳踩起動力傳輸機構及皮帶驅動式無段變速 器相對於平行於車輛寬度的方向係分別配置在左手側及在 右手側。典型地，腳踩起動軸係位在輸出軸的下側。 〇 本發明的功效 於依據本發明之小型車輛，因爲中間軸係於從動滑輪 軸的後面位在從動滑輪軸及輸出軸兩者的上側，腳踩起動 軸係設置於動力單元的後下部，且支撐腳踩起動臂之腳踩 起動軸係配置於從動滑輪軸下方之空間。因此，附接至具 有設在腳踩起動軸的基端之腳踩起動臂的外端部之腳踩起 動踏板的移動的腳踩起動踏板所起始之原始位置係位在動 力單元後方之低位置，駕駛者可容易以自然姿勢將腳放在 Ο 腳踩起動踏板且可容易地執行起動操作。 因爲腳踩起動踏板的原始位置係在動力單元後方之低 位置，將動力單元安裝在車體上的自由度增加，且可以其 在下降位置之重心而配置動力單元。 因爲用於將腳踩起動軸的動力傳輸至曲軸之腳踩起動 力傳輸機構係配置在皮帶驅動式無段變速器相對於想型車 輛的寬度的相反側’腳踩起動力傳輸機構可與皮帶驅動式 無段變速器分開地以機油而潤滑。因此，可降低摩擦損失 ，且因此，可改善起動性及耐久性。相對於小型車輛的寬 200925046 度而相互對置之皮帶驅動式無段變速器及腳踩起動力傳輸 機構的配置促使橫向平衡。 中間軸係在輸出軸及從動滑輪軸兩者的上側而位於主 架及樞轉托架的彎曲接合處的內角。因此，可將動力單元 的後上部配置於主架及樞轉托架的彎曲接合處的內角，其 中間隙減至最小可能程度。因此，可改善使駕駛者跨坐在 座位上之舒適性。 〇 因爲容納皮帶驅動式無段變速器之變速器殼不是設置 在主架下方如自上方所見，可將動力單元配置接近在主架 而無變速器殼的干擾，因爲變速器殻以主架封閉驅動及從 動滑輪兩者於其中，變速器殼不可避免地具有大結構。因 此，可改善駕駛者可跨坐該座位之舒適性，同時增加最小 道路間隙。 因爲復位彈簧係捲繞腳踩起動力傳輸機構的腳踩起動 軸以及棘輪機構係與支撐腳踩起動中間齒輪的中間軸結合 Ο ，可以軸向緊密配置分開地配置復位彈簧及棘輪機構，且 因此，可形成小橫向寬度之動力單元。 因爲曲軸係相當於汽缸的中心軸向上移位及腳踩起動 中間軸係配置在曲軸的下側，可將腳踩起動中間軸縱向配 置接近曲軸而不會使用於安裝吸氣管之空間變窄。因此， 配置腳踩起動軸及腳踩起動中間軸的自由度增加，且可形 成小尺寸之動力單元。 因爲位在腳踩起動臂的外端之腳踩起動踏板相對於車 輛的寬度係位在動力單元的外側，可取得讓駕駛者的腳放 -8- 200925046 在腳踩起動踏板之寬空間。 【實施方式】 現將參照圖1至5說明之本發明的較佳實施例。 圖1以側視圖顯示機車1，亦即，依據本發明的 車輛。 機車1具有車體架，其包括在車體的前端之頭管 〇 自頭管2延伸以向後下降之主架3、固定至主架3的 部份以向下延伸於主架3的後端部份的右及左側之右 樞轉托架4。 右及左座軌5自固定右及左樞轉托架4之主架3 份的些微前方之主架3的部份向後傾斜地上升。座軌 彎曲使得其後半部份實質上水平地延伸。右及左中間 的每一者延伸在座軌5的彎曲部份及對應樞轉托架4 〇 © 多用途箱7或類似物係配置在車架的左及右座軌 間。可開式座椅8係配置在多用途箱7上以覆蓋多用 7。在車體的前端，把手9係附加至頭管2的上端。 10自頭管2向下延伸以便轉向，且前輪π係可旋轉 撐在前叉1〇的下端上。 後叉1 3的前端部係於車體的中間部份藉由樞軸] 樞轉地支撐在樞轉托架4上，且後叉13自樞轉托架 後延伸。後輪14係可旋轉地支撐後叉13的後端部份 後叉13擺動於樞軸12上之垂直平面。每一後緩衝| 小型 2、 後端 及左 的部 5係 架6 之間 5之 途箱 前叉 地支 2可 4巷 上。 I 15 -9- 200925046 係延伸在後叉1 3的後端及座軌5之間。 動力單元20係懸掛在主架3，且係配簡 之樞轉托架4的前方。圖2顯示動力單元 20附近的部件的部份省略左側圖，圖3顯 的部份省略右側圖。參照圖1至3，懸掛托 的些微後方中間部份之主架向下延伸。安裝 力單元20的右單元殻21R及左單元殼21L 〇 突起。安裝托架20a係藉由軸16樞轉地支 3a上。安裝托架20b自分別地自單元殼21 端部件的上部件向後突起。安裝托架2 0 b倍 撐在樞轉托架4的上部件上。自單元殼21R 的下部件突起之安裝托架20c係藉由軸18 架4的下部件上。因此，動力單元20係於 樞轉托架4的前方固定地支撐在車架上。 機車1係具有延伸在動力單元20上方 © 坐式機車。車體架係以複數分開之合成樹脂 覆蓋的。 參照圖3，動力單元20係藉由結合與其 軸40配置之內燃機30及皮帶驅動式無段g 構。內燃機30及皮帶驅動式無段變速器70 力單元20的前部份及後部份。皮帶驅動式 包括安裝在形成曲軸40的一部份之驅動滑_ 驅動滑輪71、安裝在從動滑輪軸80上之從 延伸在驅動滑輪7 1及從動滑輪83間之無端 ^在主架3下方 20及動力單元 示動力單元20 架3a自主架3 托架20a自動 的上表面向上 :撐在懸掛托架 R及2 1 L的後 I藉由軸1 7支 及2 1 L的後端 支撐在樞轉托 主架3下方之 的主架3之跨 的覆蓋構件而 :橫向延伸的曲 I速器70而建 分別地形成動 無段變速器70 奋軸（圖4 )之 動滑輪83、及 皮帶75。 -10- 200925046 參照圖4，動力單元20具有與從動滑輪軸80互鎖且 藉由從動滑輪軸80從動之輸出軸25。輸出軸25自單元殼 21L的後部份向左突起，且驅動鏈輪26係安裝在輸出軸 25上。從動鏈輪27 (圖1 )係附接至後輪14的左側。鏈 條28係延伸在驅動鏈輪26及從動鏈輪27之間。旋轉動 力係自輸出軸25經由鏈條28傳輸至後輪14以使運轉用 之後輪14旋轉。輸出軸25位於樞轉地支撐後叉13之樞 〇 軸12的些微前方。鏈條28係以鏈蓋28C而覆蓋。 內燃機3 0係單缸式四衝程內燃機。如圖4所示，汽 缸體31係附接至單元殼21R及21L的前表面，且汽缸頭 3 2及汽缸蓋3 3係以此順序附接至汽缸體3 1。汽缸體3 1、 汽缸頭3 2及汽缸頭蓋3 3的組合係以實質水平姿勢傾斜以 些微向前上升。如圖1所示，節氣閥體35係連接至自形 成於汽缸頭32的上部份的吸氣口向上延伸之吸氣管34。 排氣管36自形成於汽缸頭32的下部份之排氣口向下延伸 〇 ，向後彎曲，沿著機車的右手側延伸，且係連接至後輪1 4 的右手側的消音器3 7。 參照圖4，右單元殼21R及左單元殻21L係結合一起 以界定包括曲軸箱及齒輪箱之空間。曲軸40係橫向地配 置，且係分別可旋轉地支撐於單元殼21R及21L上的軸承 41R 及 41L。 於內燃機30，爲了往復作動裝入附接至汽缸頭32的 汽缸墊片44之活塞42係藉由連桿43而連接至曲軸40的 曲軸銷40a。曲軸40的右端部份40R及左端部份40L分 200925046 別自右軸承41R及41L水平地延伸至右側及左側。凸輪驅 動鏈輪54、起動器從動齒輪114及發電機60係安裝在左 端部份40L上。腳踩起動從動齒輪136及皮帶驅動式無段 變速器70的驅動滑輪71係安裝在右端部份40R上。 四衝程內燃機30設有SOHC型閥系統。閥操作機50 係安裝於吸氣管34。凸輪鏈51係延伸在曲軸40及凸輪軸 53之間以驅動閥操作機50。左單元殼21L、汽缸頭32及 ❹ 汽缸頭蓋33界定凸輪鏈室52。 從動鏈輪55係安裝在橫向水平延伸的凸輪軸53的左 端上。驅動鏈輪54係與左軸承411鄰接地曲軸40的左端 部份40L上。凸輪鏈51係經由凸輪鏈室52延伸在驅動鏈 輪54及從動鏈輪55之間。火星塞45係裝入汽缸頭蓋33 中與凸輪鏈室5 2相對形成之孔徑，以傾斜地伸入燃燒室 中〇 起動器從動齒輪114係可旋轉地安裝在曲軸40的左 © 端部份40L上之驅動鏈輪54的左側。含於發電機60之外 軸套61係配置在起動器從動齒輪114的左側。單向離合 器59係插置在起動器從動齒輪114及外軸套61之間。 發電機60包括附接至外軸套61之杯形外轉子62、圓 周地配置在杯形外轉子62的內周部份之磁鐵63、及設有 定子線圈65之定子64，定子64係由磁鐵63所圍繞且固 定至形成於發電機蓋22的內表面之中央圓柱形部份22a。 曲軸40向左延伸穿過形成於左單元殻21L的側壁之 開口。發電機蓋22覆蓋杯形外轉子62，且係附接至界定 -12- 200925046 通向鏈室52的開口之側壁21La (圖2)。 變速器殼23係附接至右單元殼21R的右端。右單元 殼21R及變速器殼23界定齒輪室23a。變速器殼蓋24係 附接至變速器殼23的右端。變速器殼蓋24及變速器殼23 界定用於固持皮帶驅動式無段變速器70之變速器室24a。 自右軸承41R延伸至右邊之曲軸40的右端部份40R 經由變速器殼23延伸入變速器室24a。右端部份40R及 〇 變速器殼23間的間隙係藉由軸封23b所密封。腳踩起動 從動齒輪136係藉由右單元殼21R及變速器殼23所界定 之齒輪室23a中的齒條可旋轉地鎖至曲軸40的右端部份 40R。驅動滑輪71與變速器殻23及變速器殼蓋24所界定 之變速器室24a中之曲軸40的右端部份40R —起旋轉。 驅動滑輪71具有固定部位72及軸向可動部位73。固 定部位72係在曲軸40的右端附近固定地安裝在曲軸40 的一部份上。固定部位72的左側之軸向可動部位73係可 〇 軸向地滑動地放置在軸套74上的銅套，軸套74放置在曲 軸40上。凸輪板76係固定至軸套74，且係與軸向可動部 位73接合以與軸向可動部位73 —起旋轉。軸向可動部位 73可與曲軸40 —起旋轉，且可朝向及遠離固定部位72軸 向地滑動在曲軸40上。V型皮帶75係夾於固定部位72 及軸向可動部位73之間。因此，曲軸40亦供作用於支撐 驅動滑輪71之驅動滑輪軸。 凸輪板76係配置在軸向可動部位73的左側之軸封 23 b附近的預定位置。放置在凸輪板76的外周部份上之滑 -13- 200925046 件76a係與形成在軸向可動部位73的外周部份上之凸輪 板滑套73a可滑動地接合以軸向延伸。正對軸向可動部位 73的凸輪板76之側表面係錐形。乾重輥子77係固持在軸 向可動部位73的錐形側表面及凸輪板76之間。 當曲軸40的旋轉速度增加時，置於軸向可動部位73 及凸輪板76之間且與軸向可動部位73及凸輪板76 —起 旋轉之乾重輥子77係藉由離心力向外徑向地移動。因此 〇 ，軸向可動部位73係藉由乾重輥子77推向固定部位72, 藉此V型皮帶75被迫使向外徑向地移動，且固定部位72 的有效節徑增大。 於輸出軸25的前方且鄰接至輸出軸25，與驅動滑輪 71連接配置在驅動滑輪71後方之從動滑輪83係安裝在配 置在曲軸40 (從動滑輪軸）後方的位置之從動滑輪軸80 上。從動滑輪軸80係平行於曲軸40。如圖2所示，曲軸 40及輸出軸25係位在實質上相同的位準，且從動滑輪軸 © 80係位在些微高於曲軸40及輸出軸25的位準之位準。曲 軸4 0係自圓柱形的中心軸C向上移位。 從動滑輪軸8 0具有左端部份及中間部份，其可旋轉 地分別支撐於附接至向左突出之右單元殼21R的後部之軸 承78以及於附接至變速器殼23的後部之軸承79。從動滑 輪軸80經由變速器殼23延伸入變速器室24a。從動滑輪 83係安裝在延伸於從動滑輪軸80的變速器室24a之部份 上。 軸套81係自右手邊側放置在從動滑輪軸80上，且藉 -14- 200925046 由栓緊螺帽82而固定至與軸承79的內環接合接觸之從動 滑輪軸80。從動滑輪83具有放置在軸套81上之固定部位 84。從動滑輪83的軸向可動部位85係配置在固定部位84 的右手邊側，且可軸向滑動地放置在環形滑件86，環形滑 件86放在軸套81上。軸向可動部位85係藉由彈簧87向 左推壓。因此，從動滑輪83包括部位84及85。V型皮帶 75係夾於部位84及85之間。 〇 因此建構之皮帶驅動式無段變速器70經由V型皮帶 75將來自曲軸40 (驅動滑輪軸）之動力傳輸至從動滑輪 軸80。當乾重輥子77係藉由離心力向外徑向地移動而使 軸向可動部位73移向固定部位72’使得與部位72及73 接合所在之驅動滑輪71的有效節徑增大。另一方面’具 有安裝在V型皮帶75與部位84及85接合所在之從動滑 輪軸80上的部位84及85之從動滑輪83的有效節徑減小 。因此，自動式無段變速被達成。 〇 從動滑輪軸8 0及軸承7 9間之間隙係藉由裝入形成於 變速器殼23的軸承孔徑之軸封23 c而密封。安裝皮帶驅 動式無段變速器7〇之變速器室24a係藉由變速器殼23與 齒輪室23a分開。形成於變速器殼23且通向齒輪室23a 之開口中的間隙係藉由軸封23b及23c以不透液方式而密 封，以防止容納於齒輪室23a之機油滲漏入變速器室24a 〇 離心式離合器90係安裝在齒輪室23a中之從動滑輪 軸80上。 -15- 200925046 於離心式離合器90，沿著其基端固持離合器內構件 91之內軸套92係藉由齒條旋轉地鎖至從動滑輪軸80，且 複數離合器配重94的每一者係藉由樞軸93支撐以致可擺 動，樞軸93平行至離合器內構件91的周圍部上之從動滑 輪軸80。離合器外構件95具有覆蓋離合器配重94之圓柱 形圓周壁。沿著其基端而固持離合器外構件95之外軸套 97係藉由齒條鎖至離合器外齒輪98，經由軸承97可旋轉 Q 支撐在從動滑輪軸80上。 當從動滑輪軸80的旋轉速度增加超過預定旋轉速度 時，離合器配重94向外徑向地轉動之角度增大，且離合 器配重94被致使與離合器外構件95接合。因此，離合器 外齒輪98與離合器外構件95 —起接合。 減速齒輪單元100係配置於從動滑輪軸80及從動滑 輪軸80後方的輸出軸25之間的空間。如圖2及3所示’ 中間軸101係在實質上在輸出軸25上方之位置而配置在 〇 從動滑輪軸80的上側及輸出軸25上。 參照圖4，中間軸101係可旋轉地支撐於左單元殻 21L及右單元殼21R上之軸承103及104。小齒輪1〇5係 與中間軸1 Ο 1的軸承1 03及1 04之間的部份整合地形成。 大齒輪102係藉由齒條鎖至自右手軸承104向右延伸之中 間軸101的右端部。大齒輪102係與離合器外齒輪98嚙 合。 輸出軸25係可旋轉支撐於左單元殼21L及右單元殼 21R上之軸承107及108。安裝在輸出軸25的軸承及 -16- 200925046 108之間的一部份上之大齒輪106係與中間軸101的小齒 輪105嚙合。 減速齒輪因此被建構。離合器外齒輪98的旋轉係在 減小的旋轉速度經由大齒輪102而傳輸。中間軸101的旋 轉係在以小齒輪105及安裝在輸出軸25上的大齒輪106 之間的齒輪比而減小中間軸1 〇 1的旋轉速度所提供之減小 的旋轉速度而傳輸至輸出軸25。因此，安裝在自左單元殼 〇 21L突出外側之輸出軸25的左端部上之驅動鏈輪係旋轉 在減小的旋轉速度。旋轉在減小的旋轉速度之驅動鏈輪26 的旋轉係藉由鏈條28傳輸至後輪14。因此，後輪14被驅 動用於旋轉以驅動機車1進行運動。 動力單元20係在主架3下方且於樞轉托架4的前面 之位置而支撐在主架3及樞轉托架4上。中間軸1〇1係配 置在動力單元20的後部之減速齒輪單元1〇〇的輸出軸25 的上側以及在從動滑輪軸8 0的上側。如圖2及3所示， Ο 動力單元20係位於主架3及樞轉托架4的接合處的內角 部，該內角度通常是死空間。因此，動力單元20可被配 置儘可能接近主架3，且因此，機車1的最小道路間隙可 被增加。 動力單元20的內燃機30可藉由使用起動馬達1Ui 馬達起動方法及使用腳踩起動踏板的向下踩之腳踩起動方 法的任一者而起動。 參照圖2，左單元殼21L的側壁21La設有開口，該 開口係以發電機蓋22覆蓋以覆蓋配置於左單元殻21L的 -17- 200925046 前部之發電機60。側壁21La具有上突。馬達起動機構 110係配置鄰接至側壁21La。 側壁21La的上突部具有側壁部。起動馬達nl係附 接至該側壁部的右側表面。起動馬達1 1 1的驅動軸的左端 部向左延伸穿過側壁部，且驅動小齒輪1 1 2係形成在起動 馬達1 1 1的驅動軸的左端部上。中間軸1 1 3係可旋轉地支 撐在驅動小齒輪112下方。安裝在中間軸113上之大齒輪 O 113a 係與驅動小齒輪1 1 2嚙合。形成在中間軸1 1 3上之小 齒輪113b係與安裝在曲軸40的左端部份40L上之大馬達 起動器從動齒輪114嚙合。 馬達起動機構1 1 〇的起動馬達1 1 1經由中間軸1 1 3上 之大齒輪113a及小齒輪113b而驅動馬達起動器從動齒輪 114用於旋轉在減小的旋轉速度。內燃機30可藉著經由單 向離合器59及外軸套61而傳輸馬達起動器從動齒輪114 的旋轉至曲軸40而起動以強迫地旋轉曲軸40。 Ο 腳踩起動機構120係配置於由單元殼21R及21L所界 定之空間的下部。 圖5顯示沿著圖2及3中的線V-V所取之用於起動內 燃機30之腳踩起動機構120的展現剖面圖。 參照圖2及5，腳踩起動軸123係配置在從動滑輪軸 8〇下方。腳踩起動臂122的基端部係裝在腳踩起動軸123 上。 可折式腳踩起動踏板121係附接至腳踩起動臂122的 自由端部。 -18- 200925046 右單元殼21R的後半部係凹入使得該後半部朝向左單 元殻21L而突出’且單元殼2111及21L間的空間被減小。 腳踩起動軸123係可旋轉地支撐在相互接近之單元殻21R 及2 1 L的部件上。 左單元殼21L的軸承部21Lb具有厚壁圓柱的空間， 且向左突出。腳踩起動軸123延伸穿過軸承部21Lb以向 左突出。附接至腳踩起動軸123的左端部之腳踩起動臂 〇 122係位在樞轉托架4的左手側，以使腳踩起動臂122係 向左設置超過輸出軸25及樞轉托架4。因此，腳踩起動臂 122的擺動馬達不會造成防礙到樞轉托架4。 腳踩起動軸123的右端部係支撐在向右凸之右單元殼 21R的杯形凸部21 Rb上。含於杯形凸部21 Rb之復位彈簧 124係捲繞著腳踩起動軸123。復位彈簧124逆時鐘方向 地推動支撐腳踩起動臂122之腳踩起動軸123，如圖2所 不 。 ❹ 止動件125係由齒條鎖至腳踩起動軸123。形成在止 動件125上之突起125a來與形成於左單元殼21L的突起 21 Lc (圖2)接觸，以使復位彈簧124所推動之腳踩起動 臂122保持在預定位置，也就是說，腳踩起動臂122起動 其操作之原始位置。腳踩起動臂122朝向後面向上延伸。 大腳踩起動驅動齒輪126係藉由細齒鎖至腳踩起動軸 123延伸在復位彈簧124及止動件125之間的部份。短的 第一中間軸127係配置於腳踩起動軸123的前面，且係可 旋轉地支撐在單元殼21R及21L的相互接近部份。長的第 •19- 200925046 二中間軸130係配置於第一中間軸127的前面，且係可旋 轉地支撐在單元殻21R及21K與變速器殻23的相互遠離 部份。清楚地如圖2所示，腳踩起動軸123係位在低於輸 出軸2 5的位準之位準。 腳踩起動軸123、第一中間軸127及第二中間軸130 係平行於曲軸40，且係水平地橫向延伸。第二中間軸1 30 係傾斜地配置在曲軸4 0的下方及後方。小齒輪1 2 8係形 〇 成在第一中間軸127上，且大齒輪129係藉由細齒鎖至第 一中間軸127。小齒輪128係與大腳踩起動驅動齒輪126 嚙合。 長的第二中間軸130具有可旋轉地支撐在左單元殼 21L上之左端部及可旋轉地支撐在變速器殼23上之右端 部，且變速器殻23相當於中間部的側面之一部份係旋轉 地支撐在右單元殼21R上。小齒輪131係形成在第二中間 軸130接近第二中間軸130的左端軸頸部的部份上。小齒 Ο 輪131係與大齒輪129嚙合。 外螺旋齒輪130h係形成在支撐在第二中間軸130的 右單元殼21R及變速器殻23上之軸頸間之右單元殼21R 的側面之一部份。內螺旋齒輪1 32h係形成在從動螺旋齒 輪132的內圓周，且係與外螺旋齒輪13 Oh嚙合以使從動 螺旋齒輪132與外螺旋齒輪13 Oh互鎖。 如圖3所示，摩擦彈簧133的部份破圓形部133a係 於從動螺旋齒輪132的外表面裝入形成於圓周方向之圓溝 ，以夾緊從動螺旋齒輪132。摩擦彈簧133對著從動螺旋 -20- 200925046 齒輪132的旋轉施加摩擦阻抗在從動螺旋齒輪132上。自 摩擦彈簧1 3 3的部份破圓形部1 3 3 a向外徑向地延伸之桿 部133b的尖端係可滑動地裝入形成於右單元殼21R且具 有U形剖面之橫溝21Rv。 如圖5所示，棘輪齒132i•係圓周地形成在從動螺旋 齒輪132的右側表面上。大齒輪134係可旋轉地支撐在從 動螺旋齒輪132的右手側之第二中間軸130。大齒輪134 0 係藉由齒條與鎖至曲軸40之腳踩起動從動齒輪136嚙合 〇 棘輪齒134r係形成在與從動螺旋齒輪132的棘輪齒 132Γ相對之大齒輪134的左側表面上以形成棘輪機構135 。棘輪齒13 4r可與棘輪齒13 2r接合。 腳踩起動機構120因此被建構。當駕駿者踏在可折式 腳踩起動踏板121上以對著復位彈簧124的彈力而轉動腳 踩起動軸123時，安裝在腳踩起動軸123上之大腳踩起動 〇 驅動齒輪126被旋轉。然後，與第一中間軸127的小齒輪 128嚙合之大腳踩起動驅動齒輪126使第一中間軸127旋 轉在增加的旋轉速度。安裝在與第二中間軸130的小齒輪 13 1嚙合的第一中間軸127上之大齒輪129使第二中間軸 130旋轉在增加的旋轉速度。 當第二中間軸130被旋轉時，外螺旋齒輪13 〇h隨著 第二中間軸130而旋轉。施加摩擦阻抗之摩擦彈簧I33在 設有與外螺旋齒輪130h嚙合之棘輪齒132r的從動螺旋齒 輪132以減速從動螺旋齒輪132的旋轉。因此，從動螺旋 -21 - 200925046 齒輪132係向右軸向地移位，從動螺旋齒輪132的棘輪齒 13 2Γ與大齒輪134的棘輪齒13 4r接合，且大齒輪134對 著摩擦彈簧133的摩擦阻抗隨著實質上與第二中間軸130 一起旋轉之從動螺旋齒輪132而旋轉。因此，與大齒輪 134嚙合之腳踩起動從動齒輪136迫使曲軸40旋轉以起動 內燃機3 0。 當放掉腳踩起動踏板1 2 1時，復位彈簧1 24與腳踩起 Q 動臂122 —起轉動腳踩起動軸123以使腳踩起動臂122回 到原始位置。因此，第一中間軸1 2 7及第二中間軸1 3 0反 向旋轉，從動螺旋齒輪132藉由嚙合的螺旋齒輪132h及 130h的作用而向左移動，且棘輪齒I32r及134r分離。 齒輪裝置包括安裝在腳踩起動軸123上之嚙合齒輪， 腳踩起動踏板121及腳踩起動臂122係在汽缸的中心軸C 的左手側配置於腳踩起動軸123，如圖5所示。並且，第 —中間軸127及第二中間軸130，也就是說，腳踩起動機 ❹ 構120的主要腳踩起動力傳輸機構，係配置在汽缸的中心 軸C的左手側。因此，包括安裝在腳踩起動軸123上嚙合 的齒輪之齒輪裝置及主要腳踩起動力傳輸機構相對於車輛 寬度兩者係與配置在中心軸C的右手側之無段變速器7 0 對置配置。爲此理由，主要腳踩起動力傳輸機構可與乾式 皮帶驅動式無段變速器70分開，且可以機油潤滑。因此 ’摩擦損失可以增強的起動性而減小，且改善車輛的耐久 性。 相對於車輛寬度方向而相互對置之腳踩起動機構120 -22- 200925046 的主要腳踩起動力傳輸機構及皮帶驅動式無段變速器70 的配置促成動力單元20的雙側平衡。 於機車的動力單元20，中間軸101配置在從動滑輪軸 80的上側而輸出軸25係配置在從動滑輪軸80後方，且腳 踩起動軸123係配置在存在於從動滑輪軸80下方的空間 。因此，可將腳踩起動軸123配置於動力單元20的後下 部，且腳踩起動踏板121的原始位置位在動力單元20後 〇 方的低位置，附接至具有安裝在腳踩起動軸123上的基端 部之腳踩起動臂122的自由端之腳踩起動踏板121係自原 始位置移動。因此，駕駛者不需將腳提高，且可以自然姿 勢將腳容易地放在腳踩起動踏板121上，且可容易執行起 動操作。 因爲腳踩起動踏板121的原始位置位在動力單元20 後方之低位置，將動力單元20安裝在車體上的自由度增 加，且動力單元20可以其在降低位置的重心而安裝在車 ❹ 體上。 因爲動力單元20係配置使中間軸1 0 1位在輸出軸25 的上側且從動滑輪軸80位於主架3及樞轉托架4的彎曲 接合處的內角，可將動力單元20配置接近至主架3，藉此 ，將動力單元20及主架3間之間隙減至最小可能程度。 因此，可增加機車1的最小道路間隙，且在同時，可確定 使駕駛者跨坐可開式座椅8之高舒適性。 復位彈簧124係捲繞著腳踩起動機構120的主要腳踩 起動力傳輸機構的腳踩起動軸123，且包括從動螺旋齒輪 -23- 200925046 132及棘輪齒132ι•與I34r之棘輪機構135係與第二中間 軸130結合，也就是說，其上安裝有小齒輪ι31及大齒輪 134之腳踩起動中間軸。因此，復位彈簧124及棘輪機構 135係軸向地相互分離以形成具有軸向緊密構造之動力單 元20’且可形成小寬度的動力單元20，也就是說，橫向 尺寸。 因爲附接至腳踩起動臂122的外端之腳踩起動踏板 Q i21相對於車輛寬度係位在動力單元20的外側，駕駛者可 取得的寬度空間以使他的腳放在腳踩起動踏板上。 如圖4中的雙點鏈線所示，自頭管2向後延伸之主架 3係與動力單元20的汽缸的中心軸對齊，及變速器殼23 ，也就是說，含有皮帶驅動式無段變速器70之齒輪箱， 係位在如自上方所見之主架3的右手側且未設置在主架3 下方。因此，可將動力單元20配置接近至主架3而不會 使變速器殼23不可避免地形成於容納驅動滑輪71及皮帶 © 驅動式無段變速器70的從動滑輪83之大結構中而防礙到 主架3。因此，可改善使駕駛者跨坐該座椅之舒適性，同 時增加最小道路間隙。 因爲曲軸40係相當於汽缸的中心軸C而向上移位且 腳踩起動中間軸127及130係配置在曲軸40的下側，如 圖2及3所示，可將腳踩起動中間軸127及130縱向地配 置接近至曲軸40而不會使用來安裝吸氣管34之空間變窄 。因此，增加配置腳踩起動軸123及腳踩起動中間軸i 27 與130的自由度，且可形成小尺寸的動力單元20。 -24- 200925046 【圖式簡單說明】 圖1係本發明的較佳實施例之機車的側視圖； 圖2係動力單元及動力單元附近的部件的部份省略左 側圖； 圖3係動力單元及動力單元附近的部件的部份省略右 側圖； 0 圖4係沿著圖2及3中的線IV-IV所取之展現剖面圖 * 圖5係沿著圖2及3中的線V - V所取之展現剖面圖。 【主要元件之符號說明】 C :中心軸 1 :機車 2 :頭管 ❹ 3 :主架 3 a :懸掛托架 4:右及左樞轉托架 5 :右及左座軌. 6 :右及左中間架 7 :多用途箱 8 :可開式座椅 9 :把手 1 〇 :前叉 -25- 200925046 1 1 :前輪 1 2 .樞軸 1 3 :後叉 1 4 :後輪 1 5 :後緩衝器 1 6 :軸 17 ··軸200925046 IX. [Technical Field] The present invention relates to a small vehicle, It has a power unit with a belt driven stepless transmission and a foot start mechanism. [Prior Art] A locomotive with a belt-driven stepless transmission and a power unit with a foot starter are well known. E.g, Japanese Laid-Open Patent Publication No. 25 1 3 407 discloses the publication. The power unit disclosed in Japanese Utility Model No. 25 1 3407 is fixedly mounted on the body frame of the locomotive. The power provided by the output shaft of the power unit is transmitted via a chain to drive the running locomotive to the rear end supported on the rear fork for rotating the rear wheel. The belt-driven stepless transmission of the power unit is arranged on the left side with respect to the width of the locomotive. The drive pulley is mounted on the left side of the crankshaft of the engine. And the driven pulley is disposed on the rear side of the driving pulley. And the endless belt extends between the drive and the driven pulley. The output shaft is placed on the rear _ side of the driven pulley. The intermediate shaft is disposed below the driven pulley and the output shaft for transmission of power provided on the driven pulley shaft to the output shaft. The foot starter shaft supporting the foot starter arm of the foot start mechanism is disposed on the front side of the driven pulley shaft so that the foot starter shaft is not disposed in the space below the driven pulley shaft. It is equipped with an intermediate shaft. The drive helical gear train mounted on the foot pedal is engaged with the driven helical gear coaxial with the driven pulley shaft. The driven helical gear and the driven pulley shaft are interlocked by a ratchet mechanism -4- 200925046. The powertrain is driven from the driven pulley shaft to the crankshaft via an endless belt to start the internal combustion engine. therefore, The foot-starting shaft is placed on the left side with respect to the width of the locomotive. The belt-driven stepless transmission is placed on the locomotive. The foot start shaft support is on the transmission cover of the belt driven stepless transmission from the left side. The foot-starting shaft is urged toward its original position by the return spring. The foot-starting shaft disposed on the front side of the driven pulley shaft is tied at substantially the same height as the driven pulley shaft to avoid obstructing the position of the endless belt corresponding to the substantially longitudinal intermediate portion of the power unit. therefore, Attached to the free end of the foot start arm, the foot pedal is stepped high in the front. Because the foot start mechanism is arranged on the left side of the power unit, The belt-driven stepless transmission is also mounted on the power unit. The gear of the foot starting mechanism must be dry. It is difficult to lubricate the gear train with oil. The present invention has been made in accordance with the aforementioned problems, It is therefore an object of the present invention to provide a small vehicle, It has a power unit that facilitates the foot start operation and a foot start mechanism that can be lubricated with oil to reduce friction loss and improve durability. SUMMARY OF THE INVENTION In order to achieve the above objectives, The invention provides a small vehicle, contain: Power unit, The overall combination includes an internal combustion engine with a laterally extending crankshaft and a belt-driven stepless transmission. The belt-driven stepless transmission is provided with an endless belt extending between the drive pulley shaft and the driven pulley shaft that rotates together with the crankshaft. The power unit includes an intermediate -5-200925046 shaft driven by the driven pulley shaft and an output shaft driven by the intermediate shaft; Transmission mechanism, Used to transfer power to the rear wheel from the output shaft; And the body frame, Its supporting power unit: Wherein the output shaft is disposed on the rear side of the driven pulley shaft; The intermediate shaft is disposed on the upper side of the output shaft and the driven pulley shaft; a foot supporting starting shaft supporting the foot starting arm is extended parallel to the crankshaft on a lower side of the driven pulley shaft; And the foot-starting mechanism for transmitting the power to the crankshaft from the foot is disposed on the side opposite to the side of the belt-driven stepless transmission that is disposed with respect to the vehicle width direction. 0 preferably, The body frame includes a head tube, a main frame that extends from the head tube to lean backwards, And a pivoting bracket extending downwardly from the rear end portion of the main frame and pivotally supporting the rear fork; The power unit is suspended from the front side of the pivot bracket and below the main frame. And the intermediate shaft is located at the inner corner of the curved joint of the main frame and the pivot bracket. According to the invention, a transmission case that accommodates a belt-driven stepless transmission, And the transmission case will not be located under the main frame as shown from above. Preferably, The foot starting mechanism includes a large foot stepping start drive gear coaxially mounted on the foot starting shaft 、, The foot that is coaxially mounted on the crankshaft steps on the driven gear, And a foot-starting intermediate gear disposed between the big-footed start drive gear and the foot-starting driven gear, The return spring is wound around the foot starter shaft and the ratchet teeth are coupled to the foot start intermediate shaft. Several of these foot-turning intermediate gears are mounted on the foot-starting intermediate shaft. Preferably, The body frame includes a main frame that extends from the head tube to tilt rearwardly: The internal combustion engine has a cylinder head that is inclined to rise forward; An intake pipe system extending upward from the cylinder head is disposed below the main frame; The crankshaft is displaced upward relative to a central axis of the cylinder of the internal combustion engine; And the foot start intermediate shaft is located on the lower side of the crankshaft -6- 200925046. Preferably, The foot attached to the outer end of the foot starter arm is stepped on the outside of the power unit relative to the width of the vehicle. Typically, The foot-push power transmission mechanism and the belt-driven stepless transmission are disposed on the left-hand side and the right-hand side, respectively, with respect to a direction parallel to the vehicle width. Typically, The foot start shaft is tied to the lower side of the output shaft. 功效 Effect of the present invention in a small vehicle according to the present invention, Since the intermediate shaft is attached to the rear side of the driven pulley shaft on the upper side of both the driven pulley shaft and the output shaft, The foot start is set at the lower rear of the power unit. And the foot supporting the foot starter arm is set in the space below the driven pulley shaft. therefore, Attached to the foot of the foot end of the starter arm provided with the base end of the foot starter shaft, the foot of the pedal is activated, and the original position of the foot pedal is located at a low position behind the power unit. The driver can easily put his or her foot on the pedal in a natural posture and can easily perform the starting operation. Because the original position of the foot pedal is at the low position behind the power unit, The degree of freedom in mounting the power unit on the vehicle body increases. And the power unit can be arranged at the center of gravity of the lowered position. Because the power for transmitting the foot to the crankshaft is transmitted to the crankshaft, the power transmission mechanism is disposed on the opposite side of the belt-driven stepless transmission with respect to the width of the vehicle. The foot power transmission mechanism can be driven with the belt. The stepless transmission is separately lubricated with oil. therefore, Can reduce friction loss, And therefore, Improve startability and durability. The configuration of the belt-driven stepless transmission and the foot-push power transmission mechanism that are opposite each other with respect to the small vehicle's width of 200925046 degrees promotes lateral balance. The intermediate shaft is on the upper side of both the output shaft and the driven pulley shaft and is located at an inner corner of the curved joint of the main frame and the pivot bracket. therefore, The rear upper portion of the power unit can be disposed at an inner corner of the curved joint of the main frame and the pivot bracket. The gap is minimized to the minimum. therefore, It improves the comfort of the driver sitting across the seat. 〇 Because the transmission case that houses the belt-driven stepless transmission is not placed under the main frame as seen from above, The power unit can be placed close to the main frame without interference from the transmission case. Because the transmission case has both the main drive and the driven pulley in the main frame, The transmission case inevitably has a large structure. Therefore, It improves the comfort of the driver who can sit across the seat. At the same time increase the minimum road clearance. Because the return spring is wound, the foot starting shaft of the power transmission mechanism and the ratchet mechanism are combined with the intermediate shaft of the supporting foot starting intermediate gear, The return spring and the ratchet mechanism can be configured separately in an axially tight configuration. And, therefore, A power unit with a small lateral width can be formed. Because the crankshaft is equivalent to the displacement of the center axis of the cylinder and the kick start, the intermediate shaft is placed on the lower side of the crankshaft. The foot-starting intermediate shaft can be configured longitudinally close to the crankshaft without narrowing the space for installing the suction duct. therefore, The degree of freedom in configuring the foot start shaft and the foot start intermediate shaft is increased, And a small size power unit can be formed. Because the foot on the outer end of the foot arm is stepped on the outer side of the power unit relative to the width of the vehicle, Can be obtained for the driver's foot -8- 200925046 The wide space of the foot pedal. [Embodiment] A preferred embodiment of the present invention will now be described with reference to Figs. Figure 1 shows the locomotive 1 in a side view, that is, A vehicle according to the invention. The locomotive 1 has a body frame. The utility model comprises a head pipe at the front end of the vehicle body, a main frame 3 extending from the head pipe 2 to descend backward, The portion fixed to the main frame 3 extends downward to the right and left right pivot brackets 4 of the rear end portion of the main frame 3. The right and left side rails 5 are raised obliquely rearward from the portions of the main frame 3 of the front side of the main frame 3 of the fixed right and left pivoting brackets 4. The rail is curved such that the rear half thereof extends substantially horizontally. Each of the right and left middle portions extends over the curved portion of the seat rail 5 and the corresponding pivot bracket 4 〇 © the multi-purpose box 7 or the like is disposed between the left and right seat rails of the frame. The openable seat 8 is arranged on the multi-purpose case 7 to cover the multipurpose 7. At the front end of the car body, A handle 9 is attached to the upper end of the head pipe 2. 10 extends from the head tube 2 downwards for steering, And the front wheel π is rotatably supported on the lower end of the front fork 1〇. The front end portion of the rear fork 13 is pivotally supported on the pivot bracket 4 by a pivot portion in a middle portion of the vehicle body. And the rear fork 13 extends from the rear of the pivoting bracket. The rear wheel 14 rotatably supports the rear end portion of the rear fork 13 and the rear fork 13 swings on a vertical plane on the pivot shaft 12. Each post buffer | small 2 The rear end and the left part of the 5 frame 6 between the 5 boxes, the front fork, the ground support 2, 4 lanes. I 15 -9- 200925046 extends between the rear end of the rear fork 13 and the seat rail 5. The power unit 20 is suspended from the main frame 3, It is also equipped with the front of the pivoting bracket 4. Fig. 2 shows a part of the vicinity of the power unit 20, omitting the left side view, The right part of Figure 3 is omitted. Referring to Figures 1 to 3, The main frame of the slightly rear middle portion of the suspension bracket extends downward. The right unit case 21R and the left unit case 21L of the mounting force unit 20 are protruded. The mounting bracket 20a is pivotally supported by the shaft 16a. The mounting bracket 20b projects rearward from the upper member of the end member of the unit casing 21, respectively. The mounting bracket 2 0 b is supported on the upper part of the pivot bracket 4. The mounting bracket 20c projecting from the lower member of the unit casing 21R is supported by the lower member of the shaft 18 frame 4. therefore, The power unit 20 is fixedly supported on the frame in front of the pivot bracket 4. The locomotive 1 series has an extension over the power unit 20 © a seated locomotive. The body frame is covered with a plurality of separate synthetic resins. Referring to Figure 3, The power unit 20 is constructed by combining an internal combustion engine 30 disposed with its shaft 40 and a belt-driven, stepless g configuration. The front and rear portions of the internal combustion engine 30 and the belt-driven stepless transmission 70 force unit 20. The belt drive type includes a drive slide _ drive pulley 71 mounted on a portion of the crankshaft 40, Mounted on the driven pulley shaft 80 from the end between the drive pulley 7 1 and the driven pulley 83 ^ under the main frame 3 20 and the power unit power unit 20 frame 3a the autonomous frame 3 bracket 20a automatically upper surface up: After the suspension brackets R and 2 1 L are supported by the rear members of the main frame 3 under the pivot bracket main frame 3 by the rear ends of the shafts 1 7 and 2 1 L: The laterally extending curved speed governor 70 is separately formed to form a movable pulley 83 of the movable stepless transmission 70 (Fig. 4), And belt 75. -10- 200925046 Referring to Figure 4, The power unit 20 has an output shaft 25 that interlocks with the driven pulley shaft 80 and is driven by the driven pulley shaft 80. The output shaft 25 protrudes to the left from the rear portion of the unit casing 21L. And the drive sprocket 26 is mounted on the output shaft 25. The driven sprocket 27 (Fig. 1) is attached to the left side of the rear wheel 14. Chain 28 extends between drive sprocket 26 and driven sprocket 27. The rotational power is transmitted from the output shaft 25 to the rear wheel 14 via the chain 28 to rotate the rear wheel 14 for operation. The output shaft 25 is located slightly pivoting forward of the pivot axis 12 of the rear fork 13. The chain 28 is covered with a chain cover 28C. The internal combustion engine 30 is a single-cylinder four-stroke internal combustion engine. As shown in Figure 4, The cylinder block 31 is attached to the front surfaces of the unit casings 21R and 21L, The cylinder head 32 and the cylinder head 3 3 are attached to the cylinder block 31 in this order. Cylinder block 3 1, The combination of the cylinder head 3 2 and the cylinder head cover 3 3 is inclined in a substantially horizontal posture to rise slightly forward. As shown in Figure 1, The throttle body 35 is connected to an intake pipe 34 that extends upward from an intake port formed in the upper portion of the cylinder head 32. The exhaust pipe 36 extends downward from the exhaust port formed in the lower portion of the cylinder head 32, Bending backwards, Extending along the right hand side of the locomotive, And it is connected to the muffler 37 on the right hand side of the rear wheel 14. Referring to Figure 4, The right unit case 21R and the left unit case 21L are joined together to define a space including a crankcase and a gear case. The crankshaft 40 is arranged laterally, Further, the bearings 41R and 41L are rotatably supported on the unit casings 21R and 21L, respectively. In the internal combustion engine 30, The piston 42 for reciprocating actuation of the cylinder shim 44 attached to the cylinder head 32 is coupled to the crank pin 40a of the crankshaft 40 by a connecting rod 43. The right end portion 40R and the left end portion 40L of the crankshaft 40 are divided into 200925046 and extend horizontally to the right and left sides from the right bearings 41R and 41L. The cam drive sprocket 54, The starter driven gear 114 and the generator 60 are mounted on the left end portion 40L. The kick starter driven gear 136 and the drive pulley 71 of the belt drive type stepless transmission 70 are attached to the right end portion 40R. The four-stroke internal combustion engine 30 is provided with a SOHC type valve system. The valve operating machine 50 is mounted to the intake pipe 34. A cam chain 51 extends between the crankshaft 40 and the camshaft 53 to drive the valve operating machine 50. Left unit case 21L, Cylinder head 32 and 汽缸 cylinder head cover 33 define a cam chain chamber 52. The driven sprocket 55 is mounted on the left end of the laterally horizontally extending cam shaft 53. The drive sprocket 54 is attached to the left end portion 40L of the crankshaft 40 adjacent to the left bearing 411. The cam chain 51 extends between the drive sprocket 54 and the driven sprocket 55 via the cam chain chamber 52. The Mars plug 45 is installed in the cylinder head cover 33 to form an aperture opposite to the cam chain chamber 52. Extending obliquely into the combustion chamber 起动 The starter driven gear 114 is rotatably mounted to the left side of the drive sprocket 54 on the left © end portion 40L of the crankshaft 40. The sleeve 61 is disposed outside the generator 60 and is disposed on the left side of the starter driven gear 114. The one-way clutch 59 is interposed between the starter driven gear 114 and the outer boss 61. The generator 60 includes a cup-shaped outer rotor 62 attached to the outer sleeve 61, a magnet 63 disposed circumferentially on an inner peripheral portion of the cup-shaped outer rotor 62, And a stator 64 provided with a stator coil 65, The stator 64 is surrounded by a magnet 63 and fixed to a central cylindrical portion 22a formed on the inner surface of the generator cover 22. The crankshaft 40 extends leftward through an opening formed in a side wall of the left unit casing 21L. The generator cover 22 covers the cup-shaped outer rotor 62, And attached to the side wall 21La (Fig. 2) defining the opening of the chain chamber 52 to -12-200925046. The transmission case 23 is attached to the right end of the right unit case 21R. The right unit case 21R and the transmission case 23 define a gear chamber 23a. A transmission housing cover 24 is attached to the right end of the transmission housing 23. The transmission housing cover 24 and the transmission housing 23 define a transmission chamber 24a for holding the belt driven stepless transmission 70. The right end portion 40R of the crankshaft 40 extending from the right bearing 41R to the right extends into the transmission chamber 24a via the transmission case 23. The gap between the right end portion 40R and the 变速器 transmission case 23 is sealed by the shaft seal 23b. The foot starter driven gear 136 is rotatably locked to the right end portion 40R of the crankshaft 40 by a rack in the gear chamber 23a defined by the right unit case 21R and the transmission case 23. The drive pulley 71 rotates with the right end portion 40R of the crankshaft 40 in the transmission case 24a defined by the transmission case 23 and the transmission case cover 24. The drive pulley 71 has a fixed portion 72 and an axially movable portion 73. The fixed portion 72 is fixedly mounted on a portion of the crankshaft 40 near the right end of the crankshaft 40. The axially movable portion 73 of the left side of the fixed portion 72 is a copper sleeve that can be axially slidably placed on the sleeve 74. The sleeve 74 is placed on the crankshaft 40. The cam plate 76 is fixed to the sleeve 74, Further, it is engaged with the axial movable portion 73 to rotate together with the axial movable portion 73. The axially movable portion 73 is rotatable together with the crankshaft 40. The shaft 40 can be slid axially toward and away from the fixed portion 72. The V-belt 75 is sandwiched between the fixed portion 72 and the axially movable portion 73. therefore, The crankshaft 40 is also adapted to act on a drive pulley shaft that supports the drive pulley 71. The cam plate 76 is disposed at a predetermined position in the vicinity of the shaft seal 23b on the left side of the axially movable portion 73. The slide -13 - 200925046 piece 76a placed on the outer peripheral portion of the cam plate 76 is slidably engaged with the cam plate sliding sleeve 73a formed on the outer peripheral portion of the axial movable portion 73 to extend in the axial direction. The side surface of the cam plate 76 facing the axial movable portion 73 is tapered. The dry weight roller 77 is held between the tapered side surface of the axially movable portion 73 and the cam plate 76. When the rotational speed of the crankshaft 40 increases, The dry weight roller 77, which is placed between the axial movable portion 73 and the cam plate 76 and rotates together with the axial movable portion 73 and the cam plate 76, is radially outwardly moved by centrifugal force. So oh, The axially movable portion 73 is pushed toward the fixed portion 72 by the dry weight roller 77. Thereby the V-belt 75 is forced to move radially outward, Moreover, the effective pitch diameter of the fixed portion 72 is increased. In front of the output shaft 25 and adjacent to the output shaft 25, The driven pulley 83 disposed behind the drive pulley 71 and attached to the drive pulley 71 is attached to the driven pulley shaft 80 disposed at a position rearward of the crankshaft 40 (driven pulley shaft). The driven pulley shaft 80 is parallel to the crankshaft 40. as shown in picture 2, The crankshaft 40 and the output shaft 25 are at substantially the same level. And the driven pulley shaft © 80 is slightly above the level of the crankshaft 40 and the output shaft 25. The crankshaft 40 is displaced upward from the central axis C of the cylinder. The driven pulley shaft 80 has a left end portion and a middle portion. It is rotatably supported by a bearing 78 attached to the rear of the right unit case 21R protruding leftward and a bearing 79 attached to the rear of the transmission case 23. The driven pulley shaft 80 extends into the transmission chamber 24a via the transmission housing 23. The driven pulley 83 is attached to a portion of the transmission chamber 24a that extends from the driven pulley shaft 80. The sleeve 81 is placed on the driven pulley shaft 80 from the right hand side. And by the -14-200925046, the pinned nut 82 is fixed to the driven pulley shaft 80 in engagement with the inner ring of the bearing 79. The driven pulley 83 has a fixed portion 84 placed on the boss 81. The axially movable portion 85 of the driven pulley 83 is disposed on the right-hand side of the fixed portion 84. And being axially slidably placed on the annular slider 86, The annular slider 86 is placed on the sleeve 81. The axially movable portion 85 is urged to the left by the spring 87. therefore, The driven pulley 83 includes portions 84 and 85. The V-belt 75 is sandwiched between the portions 84 and 85. 〇 The belt-driven stepless transmission 70 thus constructed transmits power from the crankshaft 40 (drive pulley shaft) to the driven pulley shaft 80 via the V-belt 75. When the dry weight roller 77 is moved radially outward by the centrifugal force, the axially movable portion 73 is moved toward the fixed portion 72' so that the effective pitch diameter of the drive pulley 71 where the portions 72 and 73 are engaged is increased. On the other hand, the effective diameter of the driven pulley 83 having the portions 84 and 85 attached to the driven pulley shaft 80 where the V-belt 75 is joined to the portions 84 and 85 is reduced. therefore, Automatic stepless shifting is achieved. 间隙 The gap between the driven pulley shaft 80 and the bearing 7 9 is sealed by the shaft seal 23 c fitted in the bearing bore formed in the transmission case 23. The transmission chamber 24a to which the belt-driven stepless transmission is mounted is separated from the gear chamber 23a by the transmission case 23. The gap formed in the transmission case 23 and leading to the opening of the gear chamber 23a is sealed by the shaft seals 23b and 23c in a liquid-tight manner. The oil contained in the gear chamber 23a is prevented from leaking into the transmission chamber 24a. The centrifugal clutch 90 is attached to the driven pulley shaft 80 in the gear chamber 23a. -15- 200925046 in the centrifugal clutch 90, The inner sleeve 92 holding the clutch inner member 91 along its base end is rotationally locked to the driven pulley shaft 80 by a rack. And each of the plurality of clutch weights 94 is supported by the pivot 93 so as to be swingable, The pivot shaft 93 is parallel to the driven pulley shaft 80 on the peripheral portion of the clutch inner member 91. The clutch outer member 95 has a cylindrical circumferential wall that covers the clutch weight 94. The outer sleeve 97 is held along the base end thereof and the outer sleeve 97 is locked to the clutch outer gear 98 by a rack. Rotatable Q is supported on the driven pulley shaft 80 via a bearing 97. When the rotational speed of the driven pulley shaft 80 increases beyond a predetermined rotational speed, The angle at which the clutch weight 94 rotates radially outward increases. And the clutch weight 94 is caused to engage the clutch outer member 95. therefore, The clutch outer gear 98 is engaged with the clutch outer member 95. The reduction gear unit 100 is disposed in a space between the driven pulley shaft 80 and the output shaft 25 behind the driven pulley shaft 80. As shown in Figs. 2 and 3, the intermediate shaft 101 is disposed on the upper side of the 〇 driven pulley shaft 80 and the output shaft 25 at a position substantially above the output shaft 25. Referring to Figure 4, The intermediate shaft 101 is rotatably supported by bearings 103 and 104 on the left unit casing 21L and the right unit casing 21R. A pinion gear 1〇5 is integrally formed with a portion between the bearings 103 and 104 of the intermediate shaft 1 Ο 1 . The large gear 102 is locked to the right end portion of the intermediate shaft 101 to the right by the rack lock to the right hand bearing 104. The bull gear 102 is engaged with the clutch outer gear 98. The output shaft 25 is rotatably supported by the bearings 107 and 108 on the left unit casing 21L and the right unit casing 21R. The large gear 106 mounted on the portion of the output shaft 25 and the portion between -16 and 200925046 108 is engaged with the pinion 105 of the intermediate shaft 101. The reduction gear is thus constructed. The rotation of the clutch outer gear 98 is transmitted via the large gear 102 at a reduced rotational speed. The rotation of the intermediate shaft 101 is transmitted to the output by reducing the rotational speed provided by the rotational speed of the intermediate shaft 1 〇1 by the gear ratio between the pinion gear 105 and the large gear 106 mounted on the output shaft 25. Axis 25. therefore, The drive sprocket system mounted on the left end portion of the output shaft 25 projecting from the outer side of the left unit casing 〇 21L is rotated at a reduced rotational speed. The rotation of the drive sprocket 26 that rotates at a reduced rotational speed is transmitted to the rear wheel 14 by the chain 28. therefore, The rear wheel 14 is driven for rotation to drive the locomotive 1 to move. The power unit 20 is supported below the main frame 3 and at the front of the pivoting bracket 4 on the main frame 3 and the pivoting bracket 4. The intermediate shaft 1〇1 is disposed on the upper side of the output shaft 25 of the reduction gear unit 1A at the rear of the power unit 20 and on the upper side of the driven pulley shaft 80. As shown in Figures 2 and 3, 动力 The power unit 20 is located at the inner corner of the joint of the main frame 3 and the pivot bracket 4, This inner angle is usually dead space. therefore, The power unit 20 can be configured as close as possible to the main frame 3, And therefore, The minimum road clearance of the locomotive 1 can be increased. The internal combustion engine 30 of the power unit 20 can be started by using either the starter motor 1Ui motor starting method and the stepping start method using the foot pedal. Referring to Figure 2, The side wall 21La of the left unit case 21L is provided with an opening, The opening is covered with a generator cover 22 to cover the generator 60 disposed at the front of -17-200925046 of the left unit casing 21L. The side wall 21La has an upper protrusion. The motor starting mechanism 110 is disposed adjacent to the side wall 21La. The upper protrusion of the side wall 21La has a side wall portion. A starter motor n1 is attached to the right side surface of the side wall portion. The left end of the drive shaft of the starter motor 1 1 1 extends leftward through the side wall portion, And the drive pinion gear 1 1 2 is formed on the left end portion of the drive shaft of the starter motor 11 1 . The intermediate shaft 1 1 3 is rotatably supported below the drive pinion 112. The large gear O 113a mounted on the intermediate shaft 113 meshes with the drive pinion 11 2 . The pinion 113b formed on the intermediate shaft 1 1 3 is engaged with the large motor starter driven gear 114 mounted on the left end portion 40L of the crankshaft 40. The starter motor 1 1 1 of the motor starting mechanism 1 1 drives the motor starter driven gear 114 via the large gear 113a and the pinion 113b on the intermediate shaft 1 1 3 for rotation at a reduced rotational speed. The internal combustion engine 30 can be started to forcibly rotate the crankshaft 40 by transmitting the rotation of the motor starter driven gear 114 to the crankshaft 40 via the one-way clutch 59 and the outer bushing 61. 脚 The foot start mechanism 120 is disposed at a lower portion of the space defined by the unit casings 21R and 21L. Figure 5 shows a cross-sectional view of the foot-starting mechanism 120 for starting the internal combustion engine 30 taken along line V-V of Figures 2 and 3. Referring to Figures 2 and 5, The foot starter shaft 123 is disposed below the driven pulley shaft 8〇. The base end portion of the foot starter arm 122 is attached to the foot start shaft 123. The foldable foot start pedal 121 is attached to the free end of the foot starter arm 122. -18- 200925046 The rear half of the right unit case 21R is recessed such that the rear half protrudes toward the left unit case 21L' and the space between the unit cases 2111 and 21L is reduced. The foot start shaft 123 is rotatably supported on the members of the unit casings 21R and 21L which are adjacent to each other. The bearing portion 21Lb of the left unit case 21L has a space of a thick-walled cylinder. And protrude to the left. The foot start shaft 123 extends through the bearing portion 21Lb to protrude leftward. The foot-starting arm 〇 122 attached to the left end of the foot start shaft 123 is located on the left-hand side of the pivot bracket 4, The foot starter arm 122 is disposed to the left beyond the output shaft 25 and the pivot bracket 4. therefore, The swing motor of the foot starter arm 122 does not cause an obstacle to the pivoting bracket 4. The right end portion of the foot start shaft 123 is supported on the cup-shaped convex portion 21 Rb of the right unit case 21R which is convex rightward. The return spring 124 included in the cup-shaped convex portion 21 Rb is wound around the kick start shaft 123. The return spring 124 pushes the foot of the support foot starting arm 122 against the starting shaft 123 in a counterclockwise direction, As shown in Figure 2. 止 The stopper 125 is locked by the rack to the kick start shaft 123. The protrusion 125a formed on the stopper 125 is in contact with the protrusion 21 Lc (Fig. 2) formed in the left unit case 21L, The foot-starting arm 122 pushed by the return spring 124 is held at a predetermined position, That is, The foot starter arm 122 initiates its original position of operation. The foot starter arm 122 extends upward toward the rear. The large foot start drive gear 126 is extended by the fine tooth lock to the foot start shaft 123 between the return spring 124 and the stopper 125. The short first intermediate shaft 127 is disposed in front of the kick start shaft 123. And rotatably supported at the mutual proximity portions of the unit casings 21R and 21L. The long 19th - 200925046 second intermediate shaft 130 is disposed in front of the first intermediate shaft 127. Further, it is rotatably supported at a distance from each other between the unit casings 21R and 21K and the transmission case 23. Clearly as shown in Figure 2, The foot starter shaft 123 is at a level lower than the level of the output shaft 25. Foot start shaft 123, The first intermediate shaft 127 and the second intermediate shaft 130 are parallel to the crankshaft 40, And extending horizontally horizontally. The second intermediate shaft 1 30 is disposed obliquely below and behind the crankshaft 40. The pinion gear 1 2 8 is formed on the first intermediate shaft 127, And the large gear 129 is locked to the first intermediate shaft 127 by fine teeth. The pinion 128 is engaged with the big foot start drive gear 126. The long second intermediate shaft 130 has a left end portion rotatably supported on the left unit casing 21L and a right end portion rotatably supported on the transmission casing 23, And a portion of the side of the transmission case 23 corresponding to the intermediate portion is rotatably supported on the right unit case 21R. The pinion gear 131 is formed on a portion of the second intermediate shaft 130 that is close to the left end journal of the second intermediate shaft 130. The small toothed wheel 131 is meshed with the large gear 129. The outer helical gear 130h is formed at a portion of the side surface of the right unit case 21R supported between the right unit case 21R of the second intermediate shaft 130 and the journal on the transmission case 23. The inner helical gear 1 32h is formed on the inner circumference of the driven helical gear 132. And it meshes with the outer helical gear 13 Oh to interlock the driven helical gear 132 with the outer helical gear 13 Oh. As shown in Figure 3, A partial broken circular portion 133a of the friction spring 133 is fitted to a circular groove formed in the circumferential direction by the outer surface of the driven helical gear 132. To clamp the driven helical gear 132. The friction spring 133 exerts a frictional resistance on the driven helical gear 132 against the rotation of the driven screw -20-200925046. The tip end of the rod portion 133b extending radially outward from the partially broken circular portion 1 3 3 a of the self-friction spring 133 is slidably fitted into the lateral groove 21Rv formed in the right unit case 21R and having a U-shaped cross section. . As shown in Figure 5, The ratchet teeth 132i are circumferentially formed on the right side surface of the driven helical gear 132. The bull gear 134 is rotatably supported on the second intermediate shaft 130 on the right hand side of the driven helical gear 132. The large gear 134 0 is engaged with the driven gear 136 by the rack and the foot lock to the crankshaft 40. The ratchet teeth 134r are formed on the left side surface of the large gear 134 opposite to the ratchet teeth 132 of the driven helical gear 132. A ratchet mechanism 135 is formed. The ratchet teeth 13 4r are engageable with the ratchet teeth 13 2r. The foot start mechanism 120 is thus constructed. When the driver steps on the foldable foot starter pedal 121 to rotate the pedal starter shaft 123 against the elastic force of the return spring 124, The big foot starter mounted on the foot start shaft 123 〇 The drive gear 126 is rotated. then, The large-footed starter drive gear 126 that meshes with the pinion 128 of the first intermediate shaft 127 rotates the first intermediate shaft 127 at an increased rotational speed. A large gear 129 mounted on the first intermediate shaft 127 that meshes with the pinion gear 13 1 of the second intermediate shaft 130 rotates the second intermediate shaft 130 at an increased rotational speed. When the second intermediate shaft 130 is rotated, The outer helical gear 13 〇h rotates with the second intermediate shaft 130. The friction spring I33 that applies the frictional resistance is provided with the driven helical gear 132 of the ratchet tooth 132r that meshes with the outer helical gear 130h to reduce the rotation of the driven helical gear 132. therefore, Driven spiral -21 - 200925046 Gear 132 is axially displaced to the right, The ratchet teeth 13 2 从 of the driven helical gear 132 are engaged with the ratchet teeth 13 4r of the large gear 134, And the frictional resistance of the large gear 134 against the friction spring 133 rotates with the driven helical gear 132 that substantially rotates with the second intermediate shaft 130. therefore, The foot-actuated driven gear 136 that meshes with the large gear 134 forces the crankshaft 40 to rotate to start the internal combustion engine 30. When the foot pedal 1 2 1 is released, The return spring 1 24 and the foot pedal Q boom 122 actuate to rotate the foot start shaft 123 to return the foot start arm 122 to the home position. therefore, The first intermediate shaft 1 27 and the second intermediate shaft 1 3 0 rotate in opposite directions, The driven helical gear 132 moves to the left by the action of the meshing helical gears 132h and 130h, And the ratchet teeth I32r and 134r are separated. The gear device includes a meshing gear mounted on the foot start shaft 123, The foot start pedal 121 and the foot start arm 122 are disposed on the kick start shaft 123 on the left-hand side of the center axis C of the cylinder. As shown in Figure 5. and, a first intermediate shaft 127 and a second intermediate shaft 130, That is, The foot of the starter ❹ 120 main foot to step on the power transmission mechanism, It is placed on the left-hand side of the center axis C of the cylinder. therefore, The gear unit including the gear meshed on the kick starter shaft 123 and the main kick power transmission mechanism are disposed opposite to the vehicle width and the stepless transmission 70 disposed on the right hand side of the center axis C. For this reason, The main foot pedal power transmission mechanism can be separated from the dry belt driven stepless transmission 70. It can be lubricated with oil. Therefore, the friction loss can be reduced by the increased startability. And improve the durability of the vehicle. The configuration of the main foot-tapping power transmission mechanism and the belt-driven stepless transmission 70 of the foot-actuating mechanism 120 -22-200925046 opposed to each other in the vehicle width direction contributes to the double-sided balance of the power unit 20. On the power unit 20 of the locomotive, The intermediate shaft 101 is disposed on the upper side of the driven pulley shaft 80, and the output shaft 25 is disposed behind the driven pulley shaft 80. Further, the foot starter shaft 123 is disposed in a space existing below the driven pulley shaft 80. therefore, The foot starter shaft 123 can be disposed at the lower rear portion of the power unit 20, And the original position of the foot start pedal 121 is located at the lower position of the rear of the power unit 20, The pedal start pedal 121 attached to the free end of the foot starter arm 122 having the base end portion mounted on the kick start shaft 123 is moved from the original position. therefore, The driver does not need to raise his foot. And the foot can be easily placed on the foot starting pedal 121 in a natural posture. And it is easy to perform the starting operation. Because the original position of the foot start pedal 121 is at a low position behind the power unit 20, The degree of freedom in mounting the power unit 20 on the vehicle body is increased, And the power unit 20 can be mounted on the ram body at the center of gravity of the lowered position. Since the power unit 20 is configured such that the intermediate shaft 110 is positioned on the upper side of the output shaft 25 and the driven pulley shaft 80 is located at the inner corner of the curved joint of the main frame 3 and the pivot bracket 4, The power unit 20 can be configured to be close to the main frame 3, Take this The gap between the power unit 20 and the main frame 3 is minimized. therefore, Can increase the minimum road clearance of locomotive 1, And at the same time, The high comfort of the driver's straddleable seat 8 can be determined. The return spring 124 is wound around the foot start shaft 123 of the main foot of the foot start mechanism 120, and the power transmission mechanism is And the driven helical gear -23-200925046 132 and the ratchet gear 1321 and the I34r ratchet mechanism 135 are combined with the second intermediate shaft 130, That is, A pinion ι 31 and a large gear 134 are mounted thereon to step the starting intermediate shaft. therefore, The return spring 124 and the ratchet mechanism 135 are axially separated from each other to form a power unit 20 having an axially tightly configured power unit 20' and capable of forming a small width. That is, Horizontal size. Since the foot pedal starting pedal Q i21 attached to the outer end of the foot start arm 122 is positioned outside the power unit 20 with respect to the vehicle width, The width space that the driver can take to place his foot on the foot pedal. As shown by the double-dot chain line in Figure 4, The main frame 3 extending rearward from the head pipe 2 is aligned with the central axis of the cylinder of the power unit 20, And the transmission case 23, That is, a gearbox containing a belt driven stepless transmission 70, The tie is on the right hand side of the main frame 3 as seen from above and is not disposed below the main frame 3. therefore, The power unit 20 can be disposed close to the main frame 3 without the transmission case 23 being inevitably formed in the large structure of the driven pulley 83 accommodating the drive pulley 71 and the belt drive-type stepless transmission 70, thereby preventing the main frame from being blocked. 3. therefore, Improves the comfort of the driver in straddle the seat, At the same time increase the minimum road clearance. Since the crankshaft 40 is displaced upward corresponding to the central axis C of the cylinder and the kick start intermediate shafts 127 and 130 are disposed on the lower side of the crankshaft 40, As shown in Figures 2 and 3, The foot-starting intermediate shafts 127 and 130 can be longitudinally disposed close to the crankshaft 40 without being used to narrow the space in which the suction duct 34 is installed. therefore, Increase the degree of freedom in configuring the kick start shaft 123 and the foot start intermediate shafts i 27 and 130, And a small-sized power unit 20 can be formed. -24- 200925046 [Simplified illustration of the drawings] Fig. 1 is a side view of a locomotive according to a preferred embodiment of the present invention; Figure 2 is a partial left side view of the components in the vicinity of the power unit and the power unit; Figure 3 is a partial elevational view of a portion of the power unit and the power unit; 0 is a cross-sectional view taken along line IV-IV in FIGS. 2 and 3. * FIG. 5 is a cross-sectional view taken along line V - V in FIGS. 2 and 3. [Symbol description of main components] C : Center axis 1 : Locomotive 2 : Head tube ❹ 3 : Main frame 3 a : Suspension bracket 4: Right and left pivot brackets 5 : Right and left seat rails. 6 : Right and left intermediate frame 7 : Multi-purpose box 8 : Openable seat 9 : Handle 1 〇 : Front fork -25- 200925046 1 1 : Front wheel 1 2 . Pivot 1 3 : Rear fork 1 4 : Rear wheel 1 5 : Rear bumper 1 6 : Axis 17 ··Axis
1 8 :軸 20 :動力單元 20a :安裝托架 20b :安裝托架 20c :安裝托架 21R :右單元殼 2 1 L _·左單元殻 21 La ：側壁 2 1 Lb :軸承部 2 1Rb :杯形凸部 21Lc :突起 2 1Rv :橫溝 22a :中央圓柱形部份 22 :發電機蓋 23 :變速器殼 23a :齒輪室 23b :軸封 200925046 〇 :軸封 變速器殼蓋 :變速器室 輸出軸 驅動鏈輪 從動鏈輪 鏈條 :鏈蓋 內燃機 汽缸體 汽缸頭 汽缸頭蓋 吸氣管 節氣閥體 排氣管 消音器 曲軸 :左端部份 :曲軸銷 :右端部份 曲軸 :軸承 :軸承 活塞 -27- 200925046 43 :連桿 44 :汽缸墊片 45 :火星塞 50 :閥操作機 51 :凸輪鏈 52 :凸輪鏈室 53 :凸輪軸 0 54:凸輪驅動鏈輪 5 4 :驅動鏈輪 5 5 :從動鏈輪 59 :單向離合器 60 :發電機 61 :外軸套 62 :杯形外轉子 63 :磁鐵 G 64 :定子 65 :定子線圈 70 :皮帶驅動式無段變速器 7 1 :驅動滑輪 72 :固定部位 7 3 :軸向可動部位 7 3 a :凸輪板滑套 74 :軸套 75:無端皮帶（V型皮帶） -28- 200925046 凸輪板 :滑件 乾重輥子 軸承 軸承 從動滑輪軸 軸套 〇 螺帽 從動滑輪 固定部位 軸向可動部位 環形滑件 彈簧 離心式離合器 離合器內構件 內軸套 樞軸 離合器配重 離合器外構件 外軸套 離合器外齒輪 :減速齒輪單兀 :中間軸 :大齒輪 -29- 200925046 1 03 :軸承 1 04 :軸承 1 〇 5 :小齒輪 106 :大齒輪 1 0 7 :軸承 1 08 :軸承 I 1 0 :馬達起動機構 II 1 ·起動馬達 1 1 2 :驅動小齒輪 1 1 3 :中間軸 1 1 3 a :大齒輪 113b:小齒輪 114:起動器從動齒輪 120 :腳踩起動機構 1 2 1 :可折式腳踩起動踏板 © 122 :腳踩起動臂 123 :腳踩起動軸 124 :復位彈簧 1 2 5 :止動件 125a ：突起 126:大腳踩起動驅動齒輪 1 2 7 :第一中間軸 1 2 8 :小齒輪 129 :大齒輪 -30 200925046 1 3 0 :第二中間軸 130h:外螺旋齒輪 1 3 1 :小齒輪 132h :內螺旋齒輪 132:從動螺旋齒輪 132r :棘輪齒 1 3 3 a .部份破圓形部 0 133 :摩擦彈簧 1 3 3 b :桿部 1 3 4 :大齒輪 134r :棘輪齒 135 :棘輪機構 136:腳踩起動從動齒輪 41 1 :左軸承 ❹ -311 8 : Shaft 20 : Power unit 20a : Mounting bracket 20b : Mounting bracket 20c : Mounting bracket 21R : Right unit housing 2 1 L _· Left unit housing 21 La : Side wall 2 1 Lb : Bearing part 2 1Rb : Cup Concave convex portion 21Lc: Protrusion 2 1Rv: Lateral groove 22a: Central cylindrical portion 22: Generator cover 23: Transmission case 23a: Gear chamber 23b: Shaft seal 200925046 〇: Shaft seal transmission cover: Transmission chamber output shaft drive chain Wheel driven sprocket chain: chain cover internal combustion engine cylinder block cylinder head cylinder head suction pipe throttle valve body exhaust pipe silencer crankshaft: left end part: crankshaft pin: right end part crankshaft: bearing: bearing piston -27- 200925046 43 : Link 44 : Cylinder gasket 45 : Mars plug 50 : Valve operating machine 51 : Cam chain 52 : Cam chain chamber 53 : Camshaft 0 54 : Cam drive sprocket 5 4 : Drive sprocket 5 5 : Drive sprocket 59: one-way clutch 60: generator 61: outer bushing 62: cup-shaped outer rotor 63: magnet G 64: stator 65: stator coil 70: belt-driven stepless transmission 7 1 : drive pulley 72: fixed portion 7 3 : axial movable part 7 3 a : cam plate sliding sleeve 74: sleeve 75: endless belt (V-belt) -28- 200925046 Cam plate: slide dry weight roller bearing bearing driven pulley shaft bushing nut nut driven pulley fixed part axial movable part ring sliding part spring centrifugal clutch inner part inner bushing pivot clutch weight clutch outside External bushing clutch outer gear: reduction gear single: intermediate shaft: large gear -29- 200925046 1 03 : bearing 1 04 : bearing 1 〇 5 : pinion 106 : large gear 1 0 7 : bearing 1 08 : bearing I 1 0 : Motor starting mechanism II 1 · Starting motor 1 1 2 : Driving pinion 1 1 3 : Intermediate shaft 1 1 3 a : Large gear 113b: Pinion 114: Starter driven gear 120 : Foot starting mechanism 1 2 1 : Foldable foot start pedal © 122 : Foot start arm 123 : Foot start shaft 124 : Return spring 1 2 5 : Stop 125a : Projection 126 : Big foot start drive gear 1 2 7 : First Intermediate shaft 1 2 8 : pinion 129 : large gear -30 200925046 1 3 0 : second intermediate shaft 130h : outer helical gear 1 3 1 : small gear 132h : inner helical gear 132 : driven helical gear 132r : ratchet tooth 1 3 3 a. Partially broken round part 0 133 : Friction spring 1 3 3 b: Rod 1 3 4 : Large gear 134r : Ratchet teeth 135 : Ratchet mechanism 136: Foot start driven gear 41 1 : Left bearing ❹ -31