1235192 玖、發明說明： 【發明所屬之技術領域】 本發明係關於四行程引擎之機油回送構造，係在形成於 曲柄軸箱及側罩間的作動室内可行走地收納繞掛於固定在 曲柄軸上的驅動輪及固定於凸輪軸的從動輪的無端狀傳動 構件，同時，從氣缸罩至曲柄軸箱側亦用作為回送機油的 通路的傳動構件行走通路，係設於聯繫曲柄軸箱及氣缸罩 之間，在作動室内收納由曲柄軸所驅動的旋轉構件的四行 程引擎，尤其是關於將流下至傳動構件行走通路内的機油 回送到曲柄軸箱側用的機油回送構造的改良。 【先前技術】 將可行走地收納傳遞曲柄軸的動力給曲柄軸用的凸輪 鏈條的凸輪鏈條行走通路設於聯繫曲柄軸箱及氣缸罩間， 且位於凸輪鏈條行走通路的作動室側開口端的下方的發電 機的轉子被固定於曲柄軸且收納於作動室内的四行程引 擎，係揭示於下述的專利文獻1。 (專利文獻1 ) 日本專利第3 2 0 4 0 6 4號公報 【發明内容】 (發明所欲解決之問題） 但是在上述習知構成中，為了防止從凸輪鏈條行走通路 回送到曲柄軸箱側的機油直接接觸於發電機的飛輪式磁鐵 等的高速旋轉體，而引起攪拌阻力的增力α、或機油的劣化， 便與凸輪鏈條行走通路分開設置從氣缸罩聯繫至曲柄軸箱 3丨2/發明說明書(補件)/93-03/93 100212 1235192 的機油回送通路，在使從該機油回送通路回送到曲柄軸箱 側的機油不接觸於上述高速旋轉體上面下了 一定的功夫。 但是有與凸輪鏈條行走通路分開設置機油回送通路的必 要，因而導致施於曲柄軸箱、氣缸體及氣缸罩的加工工時 增加。 本發明係鑑於上述情況，目的在於提供一種四行程引擎 之機油回送構造，其可有效利用亦能夠發揮將機油回送到 曲柄軸箱側的機能的傳動構件行走通路，且可避免加工工 時的增加，同時，可防止機油攪拌阻力的增加及機油的劣 化。 (解決問題之手段） 為達成上述目的，申請專利範圍第1項之發明，係在形 成於可旋轉自如地支承曲柄軸的曲柄軸箱及結合於該曲柄 軸箱的側罩間的作動室内，在曲柄軸上固定著驅動輪，而 可行走地收納繞掛於固定在可旋轉自如地支承於氣缸罩的 凸輪軸的從動輪及上述驅動輪的無端狀傳動構件，同時亦 用作為從上述氣缸罩至曲柄軸箱側的機油回送通路的傳動 構件行走通路，係設於聯繫上述曲柄軸箱及上述氣缸罩之 間，在較上述傳動構件行走通路的上述作動室側的開口端 的下方側，在上述作動室内收納由曲柄軸所驅動的旋轉構 件可繞與曲柄軸平行的軸線旋轉的四行程引擎中，其特徵 為：在上述曲柄軸箱，以覆蓋上述旋轉構件的至少上述傳 動構件行走通路側的外周的方式，一體形成導引從上述傳 動構件行走通路流下至上述作動室的機油的機油導引部， 7 312/發明說明書(補件)/93-03/93100212 1235192 同時，形成將該機油導引部所導引的機油導向曲柄軸箱内 的機油回送通路。 根據如上述的申請專利範圍第1項之發明的構成，在傳 動構件行走通路内流下至作動室側的機油，係由機油導引 部所導引，使得機油可經由機油回送通路回送到曲柄轴箱 内，可極力避免流下至傳動構件行走通路内的機油接觸於 作動室内的旋轉構件，並可防止因旋轉構件攪拌機油而引 起的攪拌阻力的增力口 ，同時，可防止因機油接觸於旋轉構 件而飛濺所引起的劣化，而且，可有效利用傳動構件行走 通路而將機油回送到曲柄軸箱側，因此也不會增力ϋ力ϋ工工 時。 另外，申請專利範圍第2項之發明，係除了申請專利範 圍第1項之發明的構成之外，尚有特徵為：將上述從動輪 惻設為較上述驅動輪高，且、以上端部位於較傾斜的上述 傳動構件行走通路的下面的延長線的上方的方式形成上述 機油導引部，在高於上述下面的上方滑接於上述傳動構件 而配置於上述傳動構件行走通路内的傳動構件導引的一端 部，係保持於上述機油導引部的上端部；根據上述構成， 可極力避免沿著傳動構件行走通路的下面流下至作動室側 的機油，越過機油導引部流至旋轉構件側，而可導向機油 回送通路惻，可更為有效地防止搅拌阻力的增加及機油的 劣化。 申請專利範圍第3或4項之發明，係除了申請專利範圍 第1或2項之發明的構成之外，尚有特徵為：上述機油導 8 3丨2/發叫說明·(補件)/93-03/93丨00212 1235192 引部白勺下端 的形成於上 行走通路的 述曲柄轴箱 用的肋，係 上述機油導 構成，可避 成袋洞狀的 油從機油集 内。 又，申請 第1至4項 配置於驅動 柄軸箱及驅 入軸具有與 在上述曲柄 入軸的一端 可用作為上 接或切斷； 走通路内的 拌機油引起 於曲柄軸側 化，以抑制 的突出，可 ，係一體連 述曲柄轴箱 作動室側的 間形成連通 在上述側罩 引部的方式 免零件數的 機油集中區 中區經由機 專利範圍第 中任一項之 車輪一側的 動車輪間的 上述曲柄軸 軸箱及上述 部安裝著具 述曲柄軸及 根據上述構 機油接觸於 的攪拌阻力 ，可實現引 配置於驅動 貢獻車體均 設於應結合 的罩結合壁 開口端流下 於上述機油 與上述罩結 一體形成於 增力Π ，同時 ，可將來自 油回送通路 5項之發明 發明的構成 上述曲柄軸 上述側罩， 平行的抽線 侧罩間的作 有作為上述 上述變速輸 成，可極力 外離合器， 增力σ ，同時 擎及變速機 車輪的一側 衡性的提高 上述側罩的 ，接收從上 的機油、且 回送通路的 合壁結合時 上述側罩上 在曲柄軸箱 傳動構件行 確實回送到 ，係除了申 之外，尚有 箱，結合著 同時，變速 且支承為可 動室内，在 旋轉構件的 入軸間的動 避免流下至 因此可防止 ，可使離合 組成的動力 的動力單元 無端狀連設 述傳動構件 同時在與上 機油集中區 ，以頂接於 ;根據上述 與側罩間形 走通路的機 曲柄軸箱 請專利範圍 特徵為·在 配置於該曲 機的變速輸 旋轉自如， 上述變速輸 外離合器， 力傳遞的連 傳動構件行 外離合器攪 器靠近配置 單元的小型 從驅動車輪 3 12/發明說明書(Μ件)/93-03/93 100212 9 1235192 【實施方式】 以下，參照圖式所示的本發明的一實施例，說明本發明 之實施形態。 圖1〜圖7顯示本發明之一實施例，圖1為自動二輪車 的側視圖，圖2為自動二輪車的後部放大的側視圖，圖3 為沿著圖2中之3 - 3線所作的剖面圖，圖4為沿著圖3 中之4 - 4線所作的剖面圖，圖5為沿著圖4中之5 - 5線 所作的剖面圖，圖6為沿著圖4中之6 - 6線所作的剖面 圖，圖7為沿著圖4中之7 - 7線所作的剖面圖。 首先，圖1中，該速克達型之自動二輪車的車體框架1 1 具備：連設於可控向地支承前叉1 2的頭管1 3的前部框架 1 4，及從該前部框架1 4的後端向後上方延伸的左右一對的 後部框架1 5…。在上述前叉1 2的下端軸支有前輪WF。另 外，在上述前部框架1 4支持著腳踏板1 6，同時安裝有可 使車體自行站立的腳架1 7，在上述後部框架1 5支持有收 納箱1 8、乘椅座墊1 9及燃料箱2 0。又，支持屬驅動車輪 的後輪W R、且同時驅動該後輪W R的動力單元P，係可上下 搖動地支持於前部框架1 4的後端，在後部框架1 5及動力 單元P間設有後緩衝器2 1。 在圖2〜圖5中，動力單元P係在屬強制空冷式的單氣 筒4行程的引擎E的曲柄軸箱22中，收容曲柄軸23及齒 輪變速機T所構成，係配置於後輪WR的左右一側，本實施 例中配置於右側。上述後輪WR係安裝於具備上述齒輪變速 機T的變速輸出軸5 6。 10 3 12/發明說明(補件)/93-03/93丨00212 1235192 配置於後輪W R右側的曲柄軸箱2 2，係結合於使氣缸軸 線C向前上方傾斜的氣缸體2 4的後部，由在沿垂直面的分 割面由複數個螺栓2 6…所結合的左箱半體2 2 L及右箱半體 2 2 R所構成。在結合於氣缸體2 4前部的氣缸罩2 5的上側 面透過吸氣管27連接有氣化器28，連接於氣缸罩25的下 側面的排氣管2 9，以大幅迂迴於後輪WR的前方的方式彎 曲，排氣管2 9的下游端連接於排氣消音器3 0，該排氣消 音器3 0配置在將後輪WR夾入與上述動力單元P之間的位 置。. 在前部框架14的後端的左右兩端固定結合著支架 3 1…，在該等支架3 1…透過水平的第1樞軸3 3可搖動地 連接懸吊連桿3 2。該懸吊連桿3 2具備1根前臂3 2 a ;及左 右一對的後臂32b、32b，前臂32a係透過緩衝橡膠34而 插入前部框架1 4的後端部内而被支承。 另一方面，在曲柄軸箱2 2的左箱半體2 2 L，一體形成懸 吊臂35，該懸吊臂35在後輪WR的前方具有配置於上述兩 後臂3 2 b、3 2 b間的軸承部3 5 a，透過左右一對的橡膠墊圈 3 6…可轉動地支承該軸承部3 5 a的水平的第2樞軸3 7的兩 端，係結合於上述兩後臂3 2 b、3 2 b。因此，曲柄軸箱2 2 (亦 即動力單元P)可繞第2樞軸37上下搖動，從動力單元P 作用於懸吊連桿3 2的搖動衝擊，係由緩衝橡膠3 4所吸收。 在排氣消音器3 0上焊接著前端側具有分叉為上下之二 股部41 a、4 1 b的消音器固定桿41的基端，上述二股部 4 1 a、4 1 b係由螺栓4 2、4 2而固定於上述懸吊臂3 5的軸承 11 312/發明說明書(補件)/93-03/93100212 1235192 部 3 5 a 〇 在上述曲柄軸箱22的左箱半體22L，以與左箱半體22L 間形成作動室4 3的方式結合著配置於曲柄軸箱2 2及後輪 W R間的左側罩4 4，在曲柄軸箱2 2的左及右箱半體2 2 L、 2 2 R透過滾珠軸承4 5、4 6而支承為可旋轉自如的曲柄轴2 3 的一端被突入上述作動室43。另外，氣缸體24及氣缸罩 25和曲柄軸箱22的右箱半體22R的一部分，係由護罩47 所包覆，可旋轉自如且液密性貫穿右箱半體22R的上述曲 柄軸23的另一端部，固定著收容於上述護罩47内的發電 機48的轉子49。 在對應上述轉子4 9的部分，在護罩4 7上設有複數的吸 氣孔50、50…，在上述轉子49固定著從吸氣孔50、50… 吸入外氣的風扇51。而且，在氣缸體24及氣缸罩25的外 面，各突設有複數個冷卻風扇24a…、25a…，藉由上述風 扇5 1的作動接觸流通於護罩4 7内的冷卻用空氣。 在曲柄軸2 3透過連桿5 4連結著可滑動自如地嵌合於設 在氣缸體24内的搪缸機52的活塞53。 齒輪變速機T具備與曲柄軸2 3平行的變速輸入軸5 5及 變速輸出軸5 6，變速輸入軸5 5係以一端突入作動室4 3内 的方式而可旋轉自如地貫穿曲柄軸箱22的左箱半體22L， 並透過滾珠軸承5 7安裝於左箱半體2 2 L及變速輸入軸5 5 間。另外，變速輸入軸5 5的另一端透過滾珠軸承5 8而可 旋轉自如地支承於右箱半體2 2 R。 變速輸出軸5 6的一端可旋轉自如地貫穿左側罩4 4，在 12 312/發明說明書(補件)/93-03/93100212 1235192 左側罩44及變速輸出軸56間安裝有滾珠軸承59及環狀的 密封構件6 0，在從左側罩4 4突出的變速輸出軸5 6的一端 安裝著後輪W R。另外，變速輸出軸5 6的另一端透過滚珠 軸承6 1而可旋轉自如地支承於右箱半體2 2 R。 在作動室4 3内，在曲柄軸2 3的一端部及變速輸入軸5 5 的一端部間，裝設有一次減速裝置6 2、及可連接或切斷動 力傳遞而安裝於變速輸入軸5 5的一端部的多板離合器 6 3。一次減速裝置6 2係由固定於曲柄軸2 3的驅動齒輪6 4 及可相對旋轉地安裝於變速輸入軸5 5的從動齒輪6 5所構 成。另外，多板離合器6 3具有透過減震器6 8連結於上述 從動齒輪6 5的外離合器6 6 ;及固定於變速輸入轴5 5的一 端部的内離合器6 7，在作動室4 3内，收納於變速輸出軸 5 6及曲柄軸2 3間較小的空間的緣故而被小型化。 在曲柄軸箱22内，在變速輸入軸55及變速輸出軸56 間設有複數段、例如4段的變速齒輪組。各變速齒輪組的 從動齒輪69、70、71、72係可相對旋轉地安裝於變速輸出 軸5 6〇 上述各變速齒輪組的從動齒輪6 9、7 0、7 1、7 2，係藉由 大部分S己置於曲柄軸箱2 2的右箱半體2 2 R的外側的變換機 構7 3，選擇性連結於變速輸出軸5 6，變換機構7 3係由結 合於右箱半體2 2 R的右側罩7 4所包覆。1235192 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to the oil return structure of a four-stroke engine. It is movably stored in a working chamber formed between a crankshaft box and a side cover, and is wound and fixed to the crankshaft. The drive wheel on the top and the endless transmission member fixed to the driven wheel of the camshaft. At the same time, the transmission path for the transmission member that also serves as the path for returning the oil from the cylinder cover to the crankshaft box side is connected to the crankshaft box and the cylinder. Between the hoods, a four-stroke engine that houses a rotating member driven by a crankshaft in an operating chamber, and in particular, it relates to improvement of an oil return structure for returning oil flowing down into a transmission path of a transmission member to a crankcase side. [Prior art] A cam chain travel path movably storing a cam chain for transmitting and transmitting power of the crank shaft to the crank shaft is provided between the crankshaft box and the cylinder cover, and is located below the open end of the actuating chamber side of the cam chain travel path. The four-stroke engine in which the rotor of the generator is fixed to the crank shaft and housed in the operating room is disclosed in Patent Document 1 described below. (Patent Document 1) Japanese Patent No. 3 2 0 4 0 64 [Summary of the Invention] (Problems to be Solved by the Invention) However, in the conventional configuration described above, in order to prevent the cam chain from passing back to the crank case side The engine oil directly contacts the high-speed rotating body such as the flywheel magnet of the generator, which causes the increase of the stirring resistance α or the deterioration of the engine oil. Therefore, it is set separately from the cam chain walking path and is connected from the cylinder cover to the crankcase 3 丨 2 / Invention specification (Supplement) / 93-03 / 93 100212 1235192 The oil return path makes a certain effort to prevent the oil returned from the oil return path to the crankcase side from contacting the above-mentioned high-speed rotating body. However, it is necessary to provide an oil return path separately from the cam chain travel path, which results in an increase in the number of processing hours for the crankcase, the cylinder block, and the cylinder head. The present invention is made in view of the above circumstances, and an object thereof is to provide an oil return structure of a four-stroke engine, which can effectively utilize a transmission path of a transmission member that can also exert the function of returning the oil to the crankcase side, and can avoid an increase in processing man-hours. At the same time, it can prevent the increase of oil stirring resistance and the deterioration of the oil. (Means for Solving the Problem) In order to achieve the above-mentioned object, the invention of the first scope of the patent application is located in an operating chamber formed between a crank shaft case which rotatably supports a crank shaft and a side cover coupled to the crank shaft case. A driving wheel is fixed to the crankshaft, and a driven wheel wound around a camshaft fixed to a camshaft rotatably supported by a cylinder cover and an endless transmission member of the driving wheel are movably accommodated. The transmission path for the transmission member, which covers the oil return path from the crank case side, is provided between the crank case and the cylinder cover, and is located below the open end of the operation chamber side of the transmission path of the transmission member. The four-stroke engine in which the rotating member driven by the crank shaft is rotatable about an axis parallel to the crank shaft is housed in the operating room, wherein the crank shaft case covers at least the transmission member walking path side of the rotating member. The outer periphery of the oil guide system integrally forms an oil guide for guiding the oil flowing down from the transmission path of the transmission member to the operation chamber. Portion, oil in 7312 / present specification (complement member) / 93-03 / 931,002,121,235,192 Meanwhile, the oil guide formed by the guide portion of the crankcase oil guide loopback path. According to the constitution of the invention of claim 1 in the scope of the above-mentioned application, the oil flowing down to the actuating chamber side in the transmission path of the transmission member is guided by the oil guide, so that the oil can be returned to the crankshaft through the oil return path. Inside the box, it is possible to prevent the oil flowing down into the transmission path of the transmission member from contacting the rotating member in the operating room, and to prevent the increase of the stirring resistance caused by the rotating member stirring the engine oil. At the same time, it can prevent the oil from contacting the rotation. Deterioration due to splashing of the components, and the use of the transmission path of the transmission component can effectively use the oil to return the crankshaft to the crankcase side. Therefore, it will not increase the force and labor time. In addition, the invention in the second scope of the patent application, in addition to the structure of the invention in the first scope of the patent application, is also characterized in that the driven wheel 恻 is set higher than the drive wheel, and the upper end is located at The oil guide portion is formed above the lower extension line of the transmission member walking path that is inclined. The transmission member guide is slidably connected to the transmission member above the bottom surface and is disposed in the transmission member travel path. The leading end portion is held at the upper end portion of the oil guide portion. According to the above structure, the oil flowing down to the operating chamber side along the lower side of the transmission path of the transmission member can be prevented as much as possible, and flows over the oil guide portion to the rotating member side. , And can be guided to the oil return path 恻, can more effectively prevent the increase in stirring resistance and oil degradation. The invention of the third or fourth scope of the patent application, in addition to the constitution of the first or second scope of the patent application, is also characterized by the above-mentioned oil guide 8 3 丨 2 / Calling instructions · (Supplement) / 93-03 / 93 丨 00212 1235192 The rib for the crankshaft box formed on the upper walking path at the lower end of the leading part is composed of the above-mentioned oil guide, which can avoid the oil in the form of a bag hole from the engine oil collection. In addition, the first to fourth items of the application are arranged on the driving crank case and the driving shaft and can be connected to or cut off from the one end of the crank input shaft; the mixing oil in the passageway causes the crank shaft to be lateralized to suppress It is possible to connect the crankshaft box actuating chamber side to form an integral connection. The middle part of the oil-concentration area with the number of parts free from the number of parts in the way of the side cover lead-through is on the wheel side in any one of the scope of the machine patent. The crankshaft box and the part between the moving wheels are equipped with the crankshaft and the stirring resistance according to the contact of the above-mentioned construction oil, which can be realized. The drive body is provided at the open end of the hood coupling wall to be combined. The engine oil and the cover are integrally formed in the booster Π, and at the same time, the crankshaft, the side cover constituting the crankshaft, and the parallel draw-out side cover can be used as the speed change. The output can be maximized by the external clutch to increase the force σ, and at the same time, the balance between the engine and the side of the transmission wheel can be improved. The side cover can receive oil from above. And when the closing wall of the return path is combined, the above side cover is actually returned to the crankshaft box transmission member row. In addition to Shen, there are still boxes. At the same time, they are combined with variable speed and supported as a movable room. Intermittent movements are prevented from flowing down so that it can be prevented. The power unit composed of clutch power can be connected endlessly with the transmission member at the same time as the upper oil concentration area to abut on; The patented crankshaft box is characterized by the following features: · In the variable-speed transmission and rotation of the crank machine, the above-mentioned variable-speed transmission and external clutch, the power transmission of the transmission member, the external clutch, and the agitator close to the configuration unit are small driven wheels. Manual (M pieces) / 93-03 / 93 100212 9 1235192 [Embodiment] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show an embodiment of the present invention, FIG. 1 is a side view of the motorcycle, FIG. 2 is an enlarged side view of the rear portion of the motorcycle, and FIG. 3 is a section taken along line 3-3 in FIG. 2 Figure 4, Figure 4 is a sectional view taken along line 4-4 in Figure 3, Figure 5 is a sectional view taken along line 5-5 in Figure 4, and Figure 6 is taken along 6-6 in Figure 4 7 is a cross-sectional view taken along line 7-7 in FIG. 4. First, in FIG. 1, the body frame 1 1 of the Scooter type motorcycle includes a front frame 14 connected to a head pipe 13 that supports a front fork 12 in a controllable manner, and a front frame 14 A pair of left and right rear frames 15... Extending rearward and rearward of the rear frame 14. A front wheel WF is supported on a lower end of the front fork 12. In addition, the front frame 14 supports a foot pedal 16 and a foot stand 17 that allows the vehicle body to stand on its own is installed. The rear frame 15 supports a storage box 18 and a seat cushion 1 9 and fuel tank 2 0. In addition, a power unit P supporting the rear wheels WR belonging to the driving wheels and simultaneously driving the rear wheels WR is supported on the rear end of the front frame 14 to be able to swing up and down, and is provided between the rear frame 15 and the power unit P. There are rear buffers 2 1. In FIG. 2 to FIG. 5, the power unit P is a crankshaft case 22 of a single-cylinder 4-stroke engine E of a forced air-cooled type. The crankshaft case 22 includes a crankshaft 23 and a gear shifter T, and is disposed on the rear wheel WR. The left and right sides are arranged on the right side in this embodiment. The rear wheel WR is mounted on a transmission output shaft 56 including the gear transmission T. 10 3 12 / Explanation of the invention (Supplement) / 93-03 / 93 丨 00212 1235192 Crankshaft box 2 2 arranged on the right side of the rear wheel WR is connected to the rear part of the cylinder block 2 4 which tilts the cylinder axis C forward and upward Is composed of a left box half 2 2 and a right box half 2 2 R which are combined by a plurality of bolts 2 6... A gasifier 28 is connected to the upper side of the cylinder head 25 coupled to the front of the cylinder block 24 through a suction pipe 27, and an exhaust pipe 29 connected to the lower side of the cylinder head 25 is used to bypass the rear wheel. The WR is curved forward, and the downstream end of the exhaust pipe 29 is connected to the exhaust muffler 30, which is arranged at a position where the rear wheel WR is sandwiched between the power unit P and the rear wheel WR. Brackets 3 1... Are fixedly coupled to the left and right ends of the rear end of the front frame 14. The brackets 3 1... Are swingably connected to the suspension links 32 through a horizontal first pivot 3 3. The suspension link 32 includes one forearm 3 2 a and a pair of left and right rear arms 32 b and 32 b. The forearm 32 a is supported by being inserted into the rear end of the front frame 14 through a cushion rubber 34. On the other hand, a suspension arm 35 is integrally formed on the left case half 2 2 of the crank case 22, and the suspension arm 35 has two rear arms 3 2 b, 3 2 disposed in front of the rear wheel WR. The bearing portions 3 5 a between b are rotatably supported at both ends of a horizontal second pivot shaft 3 7 through a pair of left and right rubber washers 3 6... 2 b, 3 2 b. Therefore, the crankshaft box 2 2 (that is, the power unit P) can swing up and down about the second pivot shaft 37, and the rocking impact from the power unit P to the suspension link 32 is absorbed by the buffer rubber 34. The exhaust muffler 30 is welded to the base end of a muffler fixing rod 41 having a bifurcation portion 41 a, 4 1 b at the front end side, and the two strand portions 4 1 a, 4 1 b are bolted 4 2, 4 2 and bearings fixed to the above-mentioned suspension arm 3 5 11 312 / Invention Specification (Supplement) / 93-03 / 93100212 1235192 Section 3 5 a 〇 In the left case half 22L of the crank case 22 described above, The operation chamber 4 3 is formed between the left case half 22L and the left side cover 4 4 arranged between the crank case 2 2 and the rear wheel WR. The left and right case half 2 2 L of the crank case 2 2 are combined. One end of the crank shaft 2 3 which is rotatably supported through the ball bearings 4 5 and 4 6 is projected into the operation chamber 43. In addition, the cylinder block 24, the cylinder cover 25, and a part of the right case half 22R of the crank case 22 are covered with the shroud 47, and the crank shaft 23 is rotatable and liquid-tightly penetrates the right case half 22R. At the other end, the rotor 49 of the generator 48 housed in the shroud 47 is fixed. A plurality of suction holes 50, 50, ... are provided in the shroud 47, at a portion corresponding to the rotor 49, and a fan 51 for sucking outside air from the suction holes 50, 50, ... is fixed to the rotor 49. A plurality of cooling fans 24a ..., 25a ... are projected from the outer surfaces of the cylinder block 24 and the cylinder cover 25, and the cooling air flowing through the shroud 47 is contacted by the operation of the fan 51. A piston 53 is slidably fitted in the cylinder block 24 provided in the cylinder block 24 to the crank shaft 2 3 through a link 5 4. The gear shifter T includes a shift input shaft 5 5 and a shift output shaft 56 that are parallel to the crank shaft 23. The shift input shaft 5 5 rotatably penetrates the crank shaft case 22 so that one end protrudes into the operating chamber 4 3. The left case half 22L is mounted between the left case half 2 2 L and the variable speed input shaft 5 5 through ball bearings 5 7. The other end of the variable speed input shaft 55 is rotatably supported by the right case half 2 2 R through a ball bearing 5 8. One end of the variable speed output shaft 56 can rotate through the left side cover 4 4 freely. A ball bearing 59 and a ring are installed between the left side cover 44 and the variable speed output shaft 56 at 12 312 / Invention Manual (Supplement) / 93-03 / 93100212 1235192 A rear seal WR is attached to one end of the shifting output shaft 56 that projects from the left-side cover 44, and the sealing member 60 is shaped like this. In addition, the other end of the variable speed output shaft 56 is rotatably supported by the right case half 2 2 through a ball bearing 61. In the operating chamber 4 3, a primary reduction gear 6 2 is installed between one end of the crank shaft 23 and one end of the transmission input shaft 5 5, and the transmission input shaft 5 can be connected or cut off from the power transmission. 5 Multi-plate clutch 6 3 at one end. The primary reduction gear 6 2 is composed of a drive gear 6 4 fixed to a crank shaft 23 and a driven gear 6 5 rotatably mounted to a transmission input shaft 55. The multi-plate clutch 6 3 includes an outer clutch 6 6 connected to the driven gear 6 5 via a shock absorber 6 8, and an inner clutch 6 7 fixed to one end portion of the transmission input shaft 5 5 in the operating chamber 4 3. The inside is housed in a small space between the transmission output shaft 56 and the crank shaft 23. A plurality of stages, such as a four-stage transmission gear set, are provided in the crank case 22 between the transmission input shaft 55 and the transmission output shaft 56. The driven gears 69, 70, 71, and 72 of each transmission gear set are relatively rotatably mounted on the transmission output shaft 560. The driven gears of each of the above-mentioned transmission gear sets 6 9, 70, 71, 72, and 62 With most of the shift mechanism 7 3 placed outside the right case half 2 2 R of the crank case 2 2, it is selectively connected to the shift output shaft 5 6, and the shift mechanism 7 3 is coupled to the right case half. The right side cover 7 4 of the body 2 2 R is covered.
在變速輸出轴5 6，同轴設有開口於另一端側的導引孑L 7 5，同時，在上述各傳動齒輪6 9〜7 2的安裝部分設有聯繫 上述導引孔7 5及變速輸出軸5 6的外面間的複數導引溝 13 3 12/發丨 丨 Kflli 件)/93-03/93 100212 1235192 7 6…。上述變換機構7 3具備可滑動地嵌合於上述導引孔 7 5的移位軸7 7，及固定於該移位軸7 7的内端的繫合柱 7 8 ;繫合柱7 8係以選擇性繫合於各傳動齒輪6 9〜7 2的方 式在上述導引溝76···内滑動。 以面向上述活塞5 3的方式控制對形成於氣缸體2 4及氣 缸罩2 5間的燃燒室7 9的來自吸氣管2 7的混和氣的吸氣的 吸氣閥（未圖示），及控制從上述燃燒室7 9向上述排氣管 2 9的排氣的排氣閥（未圖示），係由具備凸輪軸8 0的動閥 裝置8 1作開閉驅動，該凸輪軸8 0具有與曲柄軸2 3平行的 軸線且由氣缸罩2 5支承為可旋轉自如，而為了旋轉驅動凸 輪軸80，在上述作動室43内，在上述曲柄軸23的一端部 固定著作為驅動輪的驅動鏈輪82，在作為固定於上述凸輪 軸8 0的從動輪的從動鏈輪8 3及上述驅動鏈輪8 2，繞掛著 屬無端狀的傳動構件的凸輪鏈條8 4。 在曲柄軸箱22、氣缸體24及氣缸罩25，設有作為可行 走地收納上述凸輪鏈條8 4的傳動構件行走通路的凸輪鏈 條通路8 5，該凸輪鏈條通路8 5與氣缸軸線C大致平行延 伸。也就是說，因為氣缸軸線C向前上方傾斜，因此凸輪 鏈條通路8 5也將上述從動鏈輪8 3側設為較上述驅動鏈輪 8 2高且向前上方傾斜之狀態。 在凸輪鏈條通路8 5内，在鬆弛側的凸輪鏈條8 4，從上 方滑接著由配置於曲柄軸2 3的上方的支軸8 6可轉動地支 承於左箱半體2 2 L的橇形的鏈條拉緊器8 7，在拉緊側的凸 輪鏈條8 4，係以一端突出於作動室4 3側的方式從下方滑 14 312/發明說明書(補件)/93-03/93100212 1235192 接著作為橇形的傳動構件導引的鏈條導引8 8，該鏈條導引 8 8的中間部係支持於氣缸體2 4。 一併參照圖6，屬於擺線泵的油泵9 0的内轉子91係連 結於變速輸入軸5 5，該油泵9 0的泵罩9 3係在與上述左箱 半體22L間以夾著内轉子91及外轉子92的方式，從作動 室4 3側固定於左箱半體2 2 L。 該油泵9 0係為將來自曲柄軸箱2 2内的底部的機油吸起 者，在右箱半體2 2 R安裝著過濾從曲柄軸箱2 2的底部吸起 的機油的過濾器9 4，在右箱半體2 2 R及左箱半體2 2 L設有 連結上述過濾器9 4及油泵9 0的吸入口 9 5間的吸入通路 9 6。另外，在左箱半體2 2 L的下部設有將回送到作動室4 3 内的機油導向曲柄軸箱2 2内的下部的連通路9 7。 一併參照圖7，連通油泵9 0的排出口 9 8的排出通路9 9 係設於左箱半體22L及右箱半體22R，該排出通路99的下 游端，連通於形成在右箱半體22R與氣缸體24的結合面的 機油溝1 0 0的一端。另外，在結合氣缸罩2 5、氣缸體2 4 及右箱半體2 2 R的複數穿通螺栓中的一個螺栓1 0 1，與氣 缸體24及氣缸罩25間，形成有連通上述機油溝100的另 一端的機油通路1 0 2，從油系9 0排出的機油經由排出通路 9 9、機油溝1 0 0及機油通路1 0 2而被供給氣缸罩2 5側，然 後上述機油被導向配設於氣缸罩2 5的動閥裝置8 1的潤滑 部。 而且，用於動閥裝置81的潤滑部的機油，係為經由凸 輪鏈條通路8 5而回送至作動室4 3側者，凸輪鏈條通路8 5 15 312/發明說明書(補件)/93-03/93100212 1235192 具有收納凸輪鏈條84而可使其於内部行走，同時，使 從氣缸罩2 5回送至曲柄軸箱2 2側的通路的機能。 在較凸輪鏈條通路8 5的作動室4 3側的開口端的下 在作動室4 3内S己置有作為由曲柄軸2 3所驅動的旋轉 的從動齒輪6 5及外離合器6 6，但在曲柄軸箱2 2的左 體2 2 L，以覆蓋上述從動齒輪6 5及外離合器6 6的至 述凸輪鏈條通路8 5側的外周的方式一體形成導引從t 鏈條通路8 5流下至作動室4 3的機油的機油導引部1 同時，形成將由該機油導引部1 0 3所導引的機油導向 軸箱 2 2内的機油回送通路1 0 4。 而且，機油導引部1 0 3係以其上端位於較上述凸輪 通路8 5的下面8 5 a的延長線L更上方的位置的方式戶 成，在較上述下面8 5 a上方的部位，滑接於凸輪鏈條 而S己置於凸輪鏈條通路8 5内的凸輪鏈條導引8 8的一 部，係保持於機油導引部1 0 3的上端部。也就是說， 導引部1 0 3的上端係形成為略J字形，藉由在凸輪鏈 引8 8的一端部插入機油導引部1 0 3的上端，凸輪鏈條 8 8的一端部被保持於機油導引部1 0 3的上端部。 機油導引部1 0 3的下端，係一體連設於應結合左側 的無端狀連設的形成於曲柄軸箱2 2的左箱半體2 2 L的 合壁1 0 5，受取從上述凸輪鏈條通路8 5的作動室4 3 開口端流下的機油、同時在與左箱半體2 2 L間形成連 述機油回送通路1 0 4的機油集中區1 0 6用的肋1 0 7， 上述左側罩4 4與罩結合壁105結合時，以頂接於機油 3丨2/發明說明ffi:(拙件)/93-03/93丨00212 機油 方， 構件 箱半 少上 ϋ輪 03， 曲柄 鏈條 1斤形 84 端 機油 條導 導引 罩44 罩結 #J白勺 通上 係在 導引 16 1235192 部1 Ο 3的方式一體形成於左側罩4 4上。 以下，說明本實施例的作用；在曲柄軸箱22的左箱半 體2 2 L，導引從凸輪鏈條通路8 5流下至作動室4 3的機油 的機油導引部1 0 3，係以覆蓋一次減速裝置6 2的從動齒輪 6 5及多板離合器6 3的外離合器6 6的至少上述凸輪鏈條通 路8 5側的外周的方式一體所形成，同時，形成將由該機油 導引部1 0 3所導引的機油導向曲柄軸箱2 2内的機油回送通 路1 0 4，因此，凸輪鏈條通路8 5内流下至作動室4 3側的 機油，係由機油導引部1 0 3所導引，使得機油可經由機油 回送通路1 0 4回送到曲柄軸箱2 2内。因此，可極力避免流 下至凸輪鏈條通路8 5内的機油接觸於作動室4 3内的上述 從動齒輪6 5及外離合器6 6，並可防止因上述從動齒輪6 5 及外離合器6 6攪拌機油而引起的攪拌阻力的增力σ，同時， 可防止因機油接觸於從動齒輪6 5及外離合器6 6而飛濺所 引起的劣化。而且，因為有效利用凸輪鏈條通路8 5而將機 油回送到曲柄軸箱 2 2側，因此也不會增力。力口工工時。 另夕卜，凸輪鏈條通路8 5係將從動鏈輪8 3側設為較驅動 鏈輪8 2高且傾斜，機油導引部1 0 3係以其上端位於較凸輪 鏈條通路8 5的下面8 5 a的延長線L上方的位置的方式所形 成，在較上述下面8 5 a上方的部位，滑接於上述凸輪鏈條 8 4而配置於凸輪鏈條通路8 5内的凸輪鏈條導引8 8的一端 部，係保持於機油導引1 0 3的上端部。因此，可極力避 免沿著凸輪鏈條通路8 5下面流下至作動室4 3側的機油越 過機油導引剖〗1 0 3而流至從動齒輪6 5及外離合器6 6惻， 17 3 12/發明說明前Μ件)/93-03/93丨00212 1235192 而可導向機油回送通路1 〇 4側，可更為有效地防止攪拌阻 力的增加及機油的劣化。 另夕卜，因為機油導引部1 0 3的下端係一體連設於應結合 左惻罩4 4的無端狀連設的形成於左箱半體2 2 L的罩結合壁 1 0 5，接收從凸輪鏈條通路8 5的作動室4 3側的開口端流下 的機油、同時在與左箱半體2 2 L間形成連通機油回送通路 1 0 4的機油集中區1 0 6用的肋1 0 7，係在左側罩4 4與罩結 合壁1 0 5結合時，以頂接於機油導引部1 0 3的方式一體形 成於左側罩4 4上，因此，可避免零件數的增力口，同時在左 箱半體2 2 L與左側罩4 4間形成袋洞狀的機油集中區1 0 6， 可將來自凸輪鏈條通路8 5的機油從機油集中區1 0 6經由機 油回送通路1 0 4確實回送到曲柄軸箱 2 2内。 又，在配置於後輪WR右側的曲柄軸箱22，結合著配置 於該曲柄軸箱22及後輪WR間的左側罩44，同時，齒輪變 速機Τ的變速輸入軸5 5具有與曲柄軸2 3平行的轴線且支 承為可旋轉自如，在曲柄軸箱22及左側罩44間的作動室 4 3内，在變速輸入軸5 5的一端部安裝著多板離合器6 3， 可用作為曲柄軸2 3及變速輸入軸5 5間的動力傳遞的連接 或切斷。根據上述構成，可極力避免流下至凸輪鏈條通路 8 5内的機油接觸於多板離合器6 3的外離合器6 6，因此可 防止外離合器6 6攪拌機油引起的攪拌阻力的增力α，同時， 可使多板離合器63靠近配置於曲柄軸23側，可實現引擎 Ε及變速機Τ組成的動力單元Ρ的小型化，以抑制配置於 後輪W R的右惻的動力單元Ρ從後輪W R的突出，可貢獻車 18 3 I 2/#叨説明Ί:Ι 丨:(汕件)/93-03/93 1 002 12 1235192 體均衡性的提高。 而且，在本實施例中，在作動室4 3内，收納於、 出軸5 6及曲柄軸2 3間較小的空間的緣故而被小型 此多板離合器6 3雖高速旋轉，仍可極力避免如上述 合器6 6接觸於流下至凸輪鏈條通路8 5内的機油， 速旋轉的外離合器6 6的授拌阻力無與機油接觸而3 情況。 以上說明了本發明之實施例，但本發明並不限於 施例，只要在未超出申請專利範圍所記載的本發明 内，可做種種的設計變更。 例如，在上述實施例中，雖說明了使用凸輪鏈條 為傳動構件的情況，但也可將本發明應用於將無端 時皮帶用作為傳動構件的四行程引擎。 (發明效果） 根據申請專利範圍第1項之發明，可防止因旋轉 拌機油而引起的攪拌阻力的增力α ，同時，可防止因 觸於旋轉構件而飛濺所引起的劣化，而且，也不會 工工時。 另外，根據申請專利範圍第2項之發明，可極力 著傳動構件行走通路的下面流下至作動室側的機油 油導引部流至旋轉構件側，可更為有效地防止攪拌 增力口及機油白勺劣化。 根據申請專利範圍第3或4項之發明，可避免零 增力α ，同時在曲柄軸箱與側罩間形成袋洞狀的機油 3 12/發明說明窗(補件)/93-03/93丨00212 ί速輸 化，因 的外離 因此兩 !加的 上述實 的範圍 8 4作 狀的定 構件攪 機油接 增加加 避免沿 越過機 阻力的 件數的 集中 19 1235192 區，可將來自傳動構件行走通路的機油從機油集中區經由 機油回送通路確實回送到曲柄軸箱内。 又，根據申請專利範圍第5項之發明，可防止外離合器 攪拌機油引起攪拌阻力增加，同時，可使離合器靠近配置 於曲柄軸側，可實現引擎及變速機組成的動力單元的小型 化，以抑制配置於驅動車輪的一側的動力單元從驅動車輪 的突出，可貢獻車體均衡性的提高。 【圖式簡單說明】 圖1為自動二輪車的側視圖。 圖2為自動二輪車的後部放大的側視圖。 圖3為沿著圖2中之3 - 3線所作的剖面圖。 圖4為沿著圖3中之4 - 4線所作的剖面圖。 圖5為沿著圖4中之5 - 5線所作的剖面圖。 圖6為沿著圖4中之6 - 6線所作的剖面圖。 圖7為沿著圖4中之7 - 7線所作的剖面圖。 (元件符號說明） C 氣缸轴線 E 引擎 P 動力單元 T 齒輪變速機 WF 前輪 WR 後輪 11 車體框架 12 前叉 20 312/發明說明書(補件)/93-03/93100212 1235192 13 頭管 14 前部框架 15 後部框架 16 腳踏板 17 腳架 18 收納箱 19 乘椅座墊 2 0 燃料箱 2 1 後緩衝器 22 曲柄軸箱 22L 左箱半體 22R 右箱半體 2 3 曲柄轴 24 氣缸體 2 4a 冷卻風扇 25 氣缸罩 2 5a 冷卻風扇 26 螺栓 27 吸氣管 28 氣化器 29 排氣管 3 0 排氣消音器 3 1 支架 32 懸吊連桿 21 312/發明說明書(補件)/93-03/93100212 1235192 32a 前臂 32b 後臂 33 第1樞軸 34 緩衝橡膠 35 懸吊臂 3 5a 軸承部 36 橡膠墊圈 37 第2樞軸 41a、41b 二股部 4 1 消音器固定桿 42 螺栓 4 3 作動室 44 左侧罩 4 5 滾珠軸承 4 6 滾珠軸承 4 7 護罩 48 發電機 4 9 轉子 5 0 吸氣孔 5 1 風扇 5 2 搪缸機 5 3 活塞 5 4 連桿 5 5 變速輸入軸 312/發明說明書(補件)/93-03/93100212 22 1235192 56 57 58 59 6 0 6 1 62 63 6 4 65 66 6 7 68 6 9 70 7 1 7 2 7 3 74 75 76 77 78 變速輸出軸 滾珠軸承 滚珠軸承 滾珠軸承 密封構件 滾珠軸承 一次減速裝置 多板離合器 驅動齒輪 從動齒輪 外離合器 内離合器 減震器 從動齒輪 從動齒輪 從動齒輪 從動齒輪 變換機構 右側罩 導引孔 導引溝 移位袖 繫合柱 燃燒室 23 丨2/發明說明書(補件)/93-03/93 1002丨2 1235192 8 0 凸輪軸 8 1 動閥裝置 8 2 驅動鏈輪 8 3 從動鏈輪 84 凸輪鏈條 8 5 凸輪鏈條通路 8 5a 凸輪鏈條通路8 5的下面 8 6 支轴 8 7 鏈條拉緊器 8 8 鏈條導引 9 0 油泵 9 1 内轉子 9 2 外轉子 9 3 泵罩 9 4 過濾器 9 5 吸入口 9 6 吸入通路 9 7 連通路 98 排出口 9 9 排出通路 10 0 機油溝 10 1 螺栓 10 2 機油通路 10 3 機油導引部 24 3 12/發明說明復(illH牛)/93-03/93 丨 00212 1235192 1 04 機 油 回 送 通路 10 5 罩 結 合 壁 1 06 機 油 集 中 1 07 肋 25 3 丨 2/發丨I/]說明·:(浦件)/93-03/93 100212The transmission output shaft 56 is coaxially provided with a guide 孑 L 7 5 which is open at the other end side. At the same time, the mounting portion of each of the transmission gears 6 9 to 7 2 is provided with a connection with the guide hole 75 and the transmission. A plurality of guide grooves 13 3 12 / rounds 丨 丨 Kflli pieces) / 93-03 / 93 100212 1235192 7 6 ... The conversion mechanism 7 3 includes a shift shaft 7 7 slidably fitted in the guide hole 75 and a coupling post 7 8 fixed to an inner end of the shift shaft 7 7. A manner of selectively engaging each of the transmission gears 6 9 to 72 slides in the guide groove 76.... An intake valve (not shown) for controlling the intake of the mixed gas from the intake pipe 27 to the combustion chamber 7 9 formed between the cylinder block 24 and the cylinder head 25 so as to face the piston 53; An exhaust valve (not shown) that controls exhaust from the combustion chamber 79 to the exhaust pipe 29 is opened and closed by an actuating valve device 81 having a camshaft 80, and the camshaft 80 The crankshaft 23 has an axis parallel to the crankshaft 23 and is rotatably supported by the cylinder head 25. In order to rotate and drive the camshaft 80, one end of the crankshaft 23 is fixed in the operating chamber 43 as a driving wheel. The driving sprocket 82 is wound around a cam chain 84 which is an endless transmission member around the driven sprocket 83 and the driving sprocket 82 which are driven wheels fixed to the camshaft 80. The crank case 22, the cylinder block 24, and the cylinder head 25 are provided with a cam chain passage 85 serving as a transmission path for the transmission member movably receiving the cam chain 84, and the cam chain passage 85 is substantially parallel to the cylinder axis C. extend. That is, since the cylinder axis C is inclined forward and upward, the cam chain passage 85 also sets the driven sprocket 83 side higher than the drive sprocket 82 and inclines forward and upward. Within the cam chain passage 8 5, the cam chain 8 4 on the slack side slides from above and is rotatably supported by a left shaft half 2 2 L by a support shaft 8 6 arranged above the crank shaft 23. The chain tensioner 8 7 and the cam chain 8 4 on the tensioning side slide from below so that one end protrudes from the operation chamber 4 3 side 14 312 / Invention Manual (Supplement) / 93-03 / 93100212 1235192 Next A chain guide 88, which is guided as a sled-shaped transmission member, is supported by the cylinder block 24 at its middle portion. Referring to FIG. 6 together, the inner rotor 91 of the oil pump 90 belonging to the cycloid pump is connected to the variable speed input shaft 55, and the pump cover 9 3 of the oil pump 90 is sandwiched with the left case half 22L. The rotor 91 and the outer rotor 92 are fixed to the left case half 2 2 L from the operation chamber 43 side. This oil pump 9 0 is a sucker for oil from the bottom of the crank case 2 2. A filter 9 4 for filtering the oil sucked from the bottom of the crank case 2 2 is attached to the right case half 2 2 R. A suction passage 96 is provided between the right case half 2 2 and the left case half 2 2 L and connects the above-mentioned filter 94 and the suction port 95 of the oil pump 90. In addition, a communication path 97 is provided at the lower portion of the left case half 2 2 L to guide the oil returned to the operating chamber 4 3 to the lower portion of the crank case 22. Referring to FIG. 7 together, a discharge passage 9 9 communicating with the discharge port 9 8 of the oil pump 90 is provided at the left case half 22L and the right case half 22R. The downstream end of the discharge passage 99 is communicated with the right case half One end of the oil groove 100 of the joint surface of the body 22R and the cylinder block 24. In addition, one bolt 1 0 1 among a plurality of through bolts that combine the cylinder head 25, the cylinder block 2 4 and the right case half 2 2 R is formed with the cylinder block 24 and the cylinder head 25 to communicate with the engine oil groove 100. At the other end of the oil passage 1 0, the oil discharged from the oil system 90 is supplied to the 5th side of the cylinder head cover 2 through the discharge passage 99, the oil groove 100, and the oil passage 1 02. It is provided in the lubrication part of the moving valve device 81 of the cylinder head 25. The oil used in the lubricating part of the moving valve device 81 is returned to the actuating chamber 4 through the cam chain passage 8 5. The cam chain passage 8 5 15 312 / Invention Manual (Supplement) / 93-03 / 93100212 1235192 has the function of accommodating the cam chain 84 so that it can travel inside and return the path from the cylinder head 25 to the crank case 22 side. Below the open end on the side of the actuating chamber 4 3 of the cam chain passage 85, in the actuating chamber 4 3, the driven gear 6 5 and the outer clutch 6 6 are rotated as driven by the crank shaft 2 3, but The left body 2 2 L of the crank case 22 is integrally formed so as to cover the outer periphery of the driven gear 65 and the outer clutch 66 to the cam chain passage 8 5 side. The guide flows down from the t chain passage 8 5. At the same time, the oil guide portion 1 of the oil to the operating chamber 4 3 forms an oil return path 104 that guides the oil guided by the oil guide portion 103 to the shaft case 2 2. Further, the oil guide portion 103 is formed so that the upper end thereof is positioned above the extension line L of the lower surface 8 5 a of the cam passage 85, and slides at a position above the lower surface 8 5 a. A part of the cam chain guide 88 which is connected to the cam chain and S has been placed in the cam chain passage 85 is held at the upper end portion of the oil guide portion 103. That is, the upper end of the guide portion 103 is formed in a slightly J-shape, and by inserting the upper end of the oil guide portion 103 into one end portion of the cam chain guide 88, one end portion of the cam chain 88 is held On the upper end of the oil guide portion 103. The lower end of the oil guide portion 103 is integrally connected to the joint wall 105 formed on the left case half 2 2 of the crank case 22 which is to be connected to the left endless end, which is connected to the cam. The oil passage flowing down from the open end of the chain passage 8 5 4 and the oil flowing down to the left case half 2 2 L at the same time forms a continuous oil return passage 1 0 4 for the oil concentration area 1 0 6 of the rib 1 0 7 as described above. When the left side cover 4 4 is combined with the cover coupling wall 105, it is abutted against the engine oil 3 丨 2 / Description of the invention ffi: (obsolete piece) / 93-03 / 93 丨 00212 Engine oil side, half of the component box upper wheel 03, crank The chain 1 kg-shaped 84-end oil fritter guide guide cover 44 cover knot #J Bai spoon is tied to the guide 16 1235192 section 1 〇 3 integrally formed on the left cover 4 4. Hereinafter, the function of this embodiment will be described. At the left case half 2 2 of the crank case 22, the oil guide portion 103 for guiding the oil flowing down from the cam chain passage 85 to the operating chamber 4 3 is The driven gear 65 of the primary reduction gear 6 2 and the outer clutch 6 6 of the multi-plate clutch 6 3 are integrally formed so as to cover at least the outer periphery of the cam chain passage 8 5 side. At the same time, the oil guide portion 1 is formed. The oil guided by 0 3 is guided to the oil return path 1 0 4 in the crankshaft case 2 2. Therefore, the oil flowing down the cam chain path 8 5 to the operating chamber 4 3 side is provided by the oil guide 1 0 3 Guided so that the oil can be sent back to the crank case 22 through the oil return path 104. Therefore, it is possible to prevent the oil flowing down into the cam chain path 85 from coming into contact with the driven gear 6 5 and the outer clutch 6 6 in the actuating chamber 4 3, and prevent the driven gear 6 5 and the outer clutch 6 6 from being caused. The increase in force σ of the stirring resistance caused by the stirring of the engine oil can also prevent deterioration due to splashing of the engine oil when it comes into contact with the driven gear 65 and the outer clutch 66. In addition, since the cam chain passage 85 is effectively used to return the oil to the crank case 22 side, there is no increase in force. Likou working hours. In addition, the cam chain passage 8 5 side is set higher and inclined than the drive sprocket 8 2 side, and the oil guide portion 103 is located at the lower end than the cam chain passage 8 5 It is formed by the position above the extension line L of 8 5 a. The cam chain guide 8 8 is slidably connected to the cam chain 8 4 at a position above the lower surface 8 5 a and is disposed in the cam chain path 8 5. One end portion is held at the upper end portion of the oil guide 103. Therefore, it is possible to prevent the oil flowing down the cam chain path 8 5 to the side of the operating chamber 4 3 from passing through the oil guide section 1 0 3 to the driven gear 6 5 and the outer clutch 6 6 恻, 17 3 12 / Description of the invention: front M pieces) / 93-03 / 93 丨 00212 1235192 and can be guided to the 104 side of the oil return path, which can more effectively prevent the increase of stirring resistance and the deterioration of the oil. In addition, since the lower end of the oil guide portion 103 is integrally connected to the endless connection of the left side cover hood 4 4 and the cover connection wall 1 2 5 formed in the left case half 2 2 is received integrally. The oil flowing down from the open end of the operating chamber 4 3 side of the cam chain passage 8 5, and at the same time, the oil return path 1 0 4 which is connected to the oil return path 1 0 4 and the oil concentration area 1 0 6 is used for the rib 1 0 7, when the left cover 4 4 is combined with the cover coupling wall 105, it is integrally formed on the left cover 4 4 so as to abut on the oil guide portion 103, so the number of parts can be avoided. At the same time, a pocket-shaped oil concentration area 1 06 is formed between the left box half 2 2 L and the left cover 4 4, and the oil from the cam chain path 8 5 can be sent from the oil concentration area 1 0 6 through the oil return path 1 0 4 is indeed returned to the crank case 2 2. In addition, a crankshaft box 22 disposed on the right side of the rear wheel WR is coupled with a left side cover 44 disposed between the crankshaft box 22 and the rear wheel WR. At the same time, the transmission input shaft 55 of the gear transmission T is provided with the crankshaft. 2 3 The parallel axis is rotatably supported. In the operating chamber 4 3 between the crank shaft case 22 and the left side cover 44, a multi-plate clutch 6 3 is installed at one end of the variable speed input shaft 5 5 and can be used as a crank. The connection or disconnection of the power transmission between the shaft 23 and the variable speed input shaft 55. According to the above configuration, the oil flowing down into the cam chain path 85 can be prevented from coming into contact with the outer clutch 66 of the multi-plate clutch 6 3, so the increase in the agitation resistance α caused by the stirring of the oil by the outer clutch 6 6 can be prevented, and at the same time, The multi-plate clutch 63 can be arranged close to the crankshaft 23 side, and the power unit P composed of the engine E and the transmission T can be miniaturized, so as to suppress the power unit P arranged on the right side of the rear wheel WR from the rear wheel WR. Prominent, can contribute to the car 18 3 I 2 / # 叨 DescriptionΊ: Ι 丨: (Shantou) / 93-03 / 93 1 002 12 1235192 Improve the body balance. Moreover, in the present embodiment, the multi-plate clutch 6 3 is small-sized because it is accommodated in a small space between the output shaft 56 and the crank shaft 23 in the operating chamber 4 3, and it can still be pushed as fast as possible. Avoid the clutch 6 6 contacting the oil flowing down into the cam chain passage 85 as described above, and the stirring resistance of the fast-rotating outer clutch 6 6 will not contact the oil 3. The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments, as long as various design changes can be made within the present invention described in the scope of the patent application. For example, in the above-mentioned embodiment, although the case where the cam chain is used as the transmission member has been described, the present invention can also be applied to a four-stroke engine using an endless belt as the transmission member. (Effects of the Invention) According to the invention of claim 1 in the scope of the patent application, it is possible to prevent the increase in the agitation resistance α caused by the rotating oil, and to prevent the deterioration caused by the splash due to contact with the rotating member. Will work hours. In addition, according to the second invention of the scope of patent application, the oil guide portion of the transmission member flowing down to the actuating chamber side can be flowed to the rotating member side as much as possible, which can more effectively prevent the stirring booster port and the oil. Deterioration. According to the invention in the scope of patent application No. 3 or 4, it is possible to avoid zero force increase α, and at the same time form a pocket-shaped motor oil between the crankcase and the side cover 3 12 / Explanation window (Supplement) / 93-03 / 93丨 00212 The speed is reduced, so two because of the out-going! The above-mentioned real range of the 8-shaped fixed component stirrer oil connection is increased, and the concentration of the number of pieces that cross the machine resistance is avoided. 19 1235192 zone, which can be from the transmission The oil of the component walking path is indeed returned to the crankshaft box from the oil concentration area via the oil return path. In addition, according to the invention in claim 5 of the scope of patent application, it is possible to prevent an increase in stirring resistance caused by the outer clutch agitator oil, and at the same time, the clutch can be arranged close to the crank shaft side, and the power unit composed of the engine and the transmission can be miniaturized. It is possible to suppress the protrusion of the power unit disposed on the side of the driving wheel from the driving wheel, and contribute to the improvement of the balance of the vehicle body. [Brief description of the drawings] FIG. 1 is a side view of the motorcycle. Fig. 2 is an enlarged side view of a rear portion of the motorcycle. Fig. 3 is a sectional view taken along line 3-3 in Fig. 2. FIG. 4 is a sectional view taken along line 4-4 in FIG. 3. FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 in FIG. 4. FIG. 7 is a sectional view taken along line 7-7 in FIG. 4. FIG. (Description of component symbols) C Cylinder axis E Engine P Power unit T Gear transmission WF Front wheel WR Rear wheel 11 Body frame 12 Front fork 20 312 / Invention manual (Supplement) / 93-03 / 93100212 1235192 13 Head tube 14 Front frame 15 Rear frame 16 Foot pedal 17 Foot stand 18 Storage box 19 Seat cushion 2 0 Fuel tank 2 1 Rear bumper 22 Crankshaft box 22L Left case half 22R Right case half 2 3 Crank shaft 24 Cylinder Body 2 4a Cooling fan 25 Cylinder cover 2 5a Cooling fan 26 Bolt 27 Suction tube 28 Vaporizer 29 Exhaust pipe 3 0 Exhaust muffler 3 1 Bracket 32 Suspension link 21 312 / Invention specification (Supplement) / 93-03 / 93100212 1235192 32a Forearm 32b Rear arm 33 1st pivot shaft 34 Cushion rubber 35 Suspension arm 3 5a Bearing section 36 Rubber washer 37 2nd pivot shaft 41a, 41b Two-strand section 4 1 Silencer fixing rod 42 Bolt 4 3 Actuating chamber 44 Left cover 4 5 Ball bearings 4 6 Ball bearings 4 7 Shroud 48 Generator 4 9 Rotor 5 0 Suction hole 5 1 Fan 5 2 Cylinder machine 5 3 Piston 5 4 Connecting rod 5 5 Variable speed input shaft 312 / Invention Specification (Supplement) / 93-03 / 93100212 22 1235192 56 57 58 59 6 0 6 1 62 63 6 4 65 66 6 7 68 6 9 70 7 1 7 2 7 3 74 75 76 77 78 Variable speed output shaft ball bearing ball bearing ball bearing seal member ball bearing primary reduction gear multi-plate clutch drive gear driven gear outer clutch inner clutch reduction Shocker driven gear Driven gear Driven gear Driven gear Driven gear conversion mechanism Right side cover Guide hole Guide groove Displacement sleeve Tie column combustion chamber 23 丨 2 / Invention manual (Supplement) / 93-03 / 93 1002 丨2 1235192 8 0 Camshaft 8 1 Actuating valve device 8 2 Drive sprocket 8 3 Driven sprocket 84 Cam chain 8 5 Cam chain passage 8 5a Cam chain passage 8 Under 5 8 Support shaft 8 7 Chain tensioner 8 8 Chain guide 9 0 Oil pump 9 1 Inner rotor 9 2 Outer rotor 9 3 Pump cover 9 4 Filter 9 5 Suction port 9 6 Suction path 9 7 Communication path 98 Discharge port 9 9 Discharge path 10 0 Oil groove 10 1 Bolt 10 2 Engine oil passage 10 3 Engine oil guide 24 3 12 / Explanation of the invention (illH cattle) / 93-03 / 93 丨 00212 1235192 1 04 Engine oil return passage 10 5 Cover joint wall 1 06 Engine oil concentration 1 07 Rib 25 3 丨 2 / 发 丨 I /] Explanation ·: (Public) / 93-03 / 93 100 212