200424427 Π) 玖、發明說明 【發明所屬之技術領域】 本發明，是關於在配置成大致水平的內燃機下部具備 有上述內燃機運轉狀態檢測用感測器的內燃機。 【先前技術】 習知以來摩托車（自動二輪車、機動腳踏車）或自動 三輪車上就搭載著各式各樣的感測器。例如：於傳動機構 (變速機），搭載著可檢測出變速段，對因應該變速段的 變化進行轉動的被檢測軸位置進行檢測的位置感測器（專 利文獻1 )。 然後，於該專利文獻1中，揭示著爲防止該位置感測 器碰撞到小石頭等造成破損而設有感測器外罩。 另一方面，已知有可檢測出內燃機的溫度，在油從汽 缸罩返回承油盤或油箱的回油通道設有溫度感測器的構成 (專利文獻2 )。 〔專利文獻1〕日本特開平10_324 1 7 1號公報[(段 落 0011 )]。 〔專利文獻2〕日本特開2000-2 1 3 326號公報（申請 專利範圍）。 【發明內容】 〔發明欲解決之課題〕 然而’習知以來卻完全沒有在內燃機設置要保護上述 -5- (2) (2)200424427 溫度感測益避免小石頭％碰撞的外罩構成。以摩托車或自 動三輪車而言’爲了達到散熱功能的發揮並且爲輕型而採 用內燃機是原狀呈露在外部的構造。因此，設置在上述回 油通道上的溫度感測器也呈露在外部，所以，在行駛時就 會擔心小石頭等碰撞到上述溫度感測器。 本發明，是爲解決上述問題而爲的發明，其目的是在 於提供一種內燃機，該內燃機具備有可保護內燃機運轉狀 態檢測用的感測器，又具組裝容易性和耐久性且爲輕型， 並且，能效率佳地使感測器和內燃機進行散熱的外罩。 〔用以解決課題之手段〕 爲解決上述課題，是於配置成大致水平的內燃機下部 具備有上述內燃機運轉狀態檢測用感測器的內燃機中，其 特徵爲具有上述感測器保護用的感測器外罩，以內燃機構 成用的汽缸兩側部來保持著該感測器外罩（申請專利範圍 第1項所記載的發明）。 根據該發明時，因上述感測器是爲上述感測器外罩所 保護的同時，上述感測器外罩爲汽缸的兩側部所保持著， 所以即使行駛中受到小石頭等的碰撞造成對感測器外罩施 加有過大的載重，但也因爲於感測器外罩整體施賦有欲往 前後方向轉動的力，所以就形成爲緩衝，因此能夠避免對 小石頭等所碰撞的部位造成載重的集中。即’是能夠提昇 感測器外罩的耐久性，其結果，是能夠保護感測器。 於該狀況，若上述感測器外罩’是以··從上述汽缸的 -6- (3) (3)200424427 前方指向後方彎曲形成大致爲L字形狀的板狀構件；及， 可支撐上述板狀構件的棒狀構件來構成時（申請專利範圍 第2項所記載的發明），則感測器外罩就具有充分的耐久 性。換句話說，板狀構件的板厚即使是爲某程度的薄時也 能夠維持在做爲感測器外罩時的耐久性，因此感測器外罩 本身就能夠成爲輕型。 再加上，即使板狀構件每個部位的厚度多少有些不 均’但也因如上述》該板狀構件是以棒狀構件支撐著，所 以就能獲得在做爲感測器外罩時的充分耐久性。即，因板 狀構件並非得以高精度形成不可，所以能夠容易並且價廉 製造。 此外，上述板狀構件，因是從汽缸的前方指向後方彎 曲形成大致爲L字形狀，所以汽缸的前方及下方就爲其所 覆蓋，汽缸的側方及後方是爲開放。即，因小石頭等碰撞 可能性最高的前方及下方是被覆蓋著，所以上述感測器就 會被保護著。另一方面，因側方及後方是爲開放，所以行 駛造成的受風接觸在汽缸及感測器上的面積會變大，因此 能夠恰當地對兩者進行冷卻。 又另外，在將上述汽缸側的安裝部形成在該汽缸側部 上所形成的散熱片間的另一方面，最好是將上述感測器外 罩側的安裝部至少有一部份的形狀形成爲是應對於上述散 熱片間的形狀（申請專利範圍第3項所記載的發明）。由 於是成爲如此構成，使上述感測器外罩側的安裝部是被散 熱片夾著定位，所以能夠阻止感測器外罩的旋轉。因此’ (4) (4)200424427 例如：在用螺栓固定汽缸和感測器外罩時，於各別的側 面，以1點固定即可，所以能夠削減螺栓數量的同時，在 對內燃機組裝汽缸和感測器外罩時的組裝作業也變容易。 又加上，爲了將上述各安裝部彼此以螺栓進行固定而 將上述各螺栓的螺軸形成爲對上述汽缸的前後是成大致垂 直的同時，上述各螺軸是設定成爲同軸時（申請專利範圍 第4項所記載的發明），因小石頭等碰撞造成的載重，是 大致均等施加在汽缸兩端的螺栓所緊固部，所以能夠避免 螺栓的扭轉，能夠提昇汽缸的耐久性。 此外，若在上述板狀構件的彎曲部至少一方的端部設 有缺口部時（申請專利範圍第5項所記載的發明），則行 駛造成的受風會被捲入在該缺口部而流入感測器外罩內 部，因此能夠直接對感測器進行冷卻。再加上，在內燃機 即使是以整流罩包覆著時，也會因該缺口部的設置使感測 器外罩和整流罩之間能夠確保有空間，所以就能夠充分確 保行駿時的受風流動，能夠效率佳地由該風對感測器和汽 缸進行冷卻。 又加上，若上述感測器外罩是以金屬來形成時（申請 專利範圍第6項所記載的發明），則能夠將來自於內燃機 的熱傳至感測器外罩側。因此，藉由放熱效果可使熱從感 測器外罩的表面放出，能夠恰當地使內燃機進行散熱。 【實施方式】 〔發明之實施形態〕 -8- (5) (5)200424427 以下參照附件例示有自動二輪車的圖面，對本發明的 實施形態進行以下詳細說明。 第1圖，是本發明一實施形態所適用的自動二輪車 1 0的整體構成說明用側面圖。自動二輪車1 0，具有可成 . 爲骨架的車體框架12，上述車體框架12，是前部框架14 和後部框架16所結合構成。 上述前部框架1 4，是由頭部支撐管1 8及從該頭部支 撐管1 8朝後方斜下延伸的主支撐管20所構成。於頭部支 φ 撐管1 8，在下端部將前輪22支撐成能旋轉的前叉24是 可操縱地被支撐著，於該前叉24的上端部固定著方向握 把26。於主支撐管20的下端部，懸吊支撐著被配置成大 致爲水平的氣冷式內燃機3 0。對於內燃機3 0的說明將於 後進行敘述。 後部框架1 6，是由後部支撐管32及聯結於該後部支 撐管32的座墊軌道34所構成。座墊軌道34上設有駕駛 者乘坐用的座墊36。 春 於內燃機3 0的後部，擺動臂40是被支撐成可上下方 向擺動，於該擺動臂40的後端部，後輪42是旋轉自如地 被支撐著，在擺動臂40和後輪42之間，聯結著緩衝器 、 44 ° 可是，前部框架14構成用的主支撐管20的側方，是 由主支撐管側蓋板50包覆著。於主支撐管側蓋板50的兩 側部裝脫自如地安裝有遮蓋駕駛者腳部的腿盾板5 2 ’於 主支撐管側蓋板5 0的前部配設有前頂罩5 4，又於主支撐 -9- (6) (6)200424427 管側蓋板5 0的後部配設有主支撐管頂罩5 6。此外，於主 支撐管側蓋板5 0的下部配設有可覆蓋上述內燃機3 0的底 蓋5 8 (也稱整流罩）。於該狀況時，在底蓋5 8的前部， 形成有行駛時可對上述內燃機3 0供給風的開口部6 0。 於此，對內燃機3 0進行說明。內燃機3 0，如第2圖 所示，是基本性構成具備有曲柄箱72、汽缸74、汽缸罩 76、潤滑系統（未圖示）。 於曲柄箱72內，收容著被支撐在車體左右方向的曲 柄軸80及油泵82，另外，於曲柄箱72底部形成有儲藏 油的承油盤（未圖示）。於該狀況時，承油盤也可以是油 箱。 於汽缸74的內部形成有汽缸襯套90，於該汽缸襯套 90，滑動自如地嵌合著活塞92。活塞92，是中介著連桿 9 4聯結於曲柄軸8 0。 於汽缸罩76的內部形成有動閥室（未圖示），於該 動閥室內收容著動閥機構1 0 0。動閥機構1 〇 〇，是由：轉 動自如地被支撐在汽缸罩76上的凸輪軸1〇2; —體形成 在上述凸輪軸102上的吸氣凸輪及排氣凸輪；被支撐在吸 氣搖臂軸上抵接於上述吸氣凸輪的吸氣搖臂；被支撐在排 氣搖臂軸上抵接於上述排氣凸輪的排氣搖臂；爲上述吸氣 搖臂所驅動的吸氣閥1 0 4 ;及，爲上述排氣搖臂所驅動的 排氣閥106等所構成。 另，於曲柄軸8 〇和凸輪軸1 〇 2上，圈掛著未圖示的 同步鏈。 -10- (7) (7)200424427 潤滑系統，是由：從形成在曲柄箱7 2上的上述承油 盤供給油至汽缸罩76的油供給通道（未圖示）；從上述 汽缸罩76返回油至上述承油盤的回油通道1 3 0 (參照第3 圖）；及，被收容在曲柄箱7 2內的上述油泵8 2所構成。 回油通道130，是使曲柄箱72的上述承油盤和汽缸罩76 的上述動閥室成連接以形成汽缸74。 於汽缸74的下部，如第2圖及第3圖所示，在配設 有連通著回油通道1 3 0對是爲機械運轉狀態一種的油溫度 進行檢測的溫度感測器1 32的同時，於汽缸74上，安裝 有該溫度感測器132保護用的感測器外罩140。 感測器外罩140，如第3圖及第4圖所示，是由：鐵 製棒狀構件1 42、鋼板製板狀構件1 44、鋼板製安裝板 146 (安裝部）所構成。 棒狀構件1 42，如第4圖所示，是在彎曲部A〜D的 4處彎曲形成。在彎曲部A〜C所形成的C字形狀部1 4 8 上結合著上述板狀構件1 44，在彎曲部C、D間所形成的 直線部150的下部，周圍圍著消音器152 (參照第3圖） 等的輔助機械裝置。 於該狀況時，彎曲部A〜D的位置，雖是需考慮到溫 度感測器1 3 2的大小或配置，以及汽缸7 4的寬度，或消 音器1 52等的輔助機械裝置的配置來做決定，但若能盡可 能地沿著汽缸74的形狀來做決定時，則可使汽缸74的下 部空間變寬成爲較恰當。 此外，於棒狀構件1 42的兩端部結合著上述安裝板 -11 - (8) (8)200424427 1 4 6。於該狀況時，在對棒狀構件1 4 2與板狀構件1 4 4及 安裝板1 46進行結合時以焊接來進行結合將會增加強度故 爲恰當。 板狀構件1 4 4，是於彎曲部1 5 4從汽缸7 4的前方指 向後方彎曲，形成爲大致爲L字形狀。於上述彎曲部1 5 4 的一方端部形成有缺口部1 5 6 (參照第5圖）。 於安裝板146上，形成有感測器外罩140要保持固定 在汽缸74上時螺栓157插入用的插入孔158的同時，安 裝板146的前端部160的形狀，是應變於形成在汽缸74 側部的散熱片1 6 1間的形狀。即，於本實施形態中，從第 2圖及第4圖中得以瞭解，因散熱片1 6 1是配設成大致爲 平行，所以前端部1 60的形狀也與此應對，形成爲側部是 成大致爲平行的板狀構件。 另一方面，如第4圖所示，設置在汽缸74側部的散 熱片1 6 1的一部份。是應對於上述安裝板1 4 6的形狀而形 成爲缺口。於該缺口部，上述安裝板1 46安裝用的安裝突 面170、170(安裝部）是與汽缸74 —體形成。上述各安 裝突面170、170，是比上述散熱片161的頂部還埋入形 成在汽缸74的內部，於上述各安裝突面170、170的大致 中央部，形成有上述螺栓1 5 7栓入用的栓入孔1 72 (螺 軸）。於該狀況時，各栓入孔172、172，是對汽缸74的 前後方向形成大致爲垂直的同時，各栓入孔172、172是 設定成爲同軸。 即，從第4圖及第6圖中得以瞭解，感測器外罩 -12- (9) (9)200424427 140，是中介著上述各安裝板146、146及各安裝突面 170、170安裝在汽缸74側面的散熱片161上。其結果， 溫度感測器1 3 2是配置在彎曲部1 54所形成的板狀構件 1 44的內部空間。即，感測器外罩1 40構成用的板狀構件 1 4 4的垂直部位是面對於自動二輪車.1 〇的前方，該板狀 構件1 44的水平部位是面對於路面以保護溫度感測器 132。另，板狀構件144的兩側面是成開放以容許大氣流 通。 包含著本實施形態內燃機3 0的自動二輪車1 0，於基 本上是構成爲以上所述，接著，對其動作進行說明。 當透過駕駿者的啓動操作使內燃機3 0開始起動時， 收容在曲柄箱7 2內的曲柄軸8 0會進行旋轉。該曲柄軸 8 〇的旋轉力是中介著傳動輪（未圖示）傳達，使油泵8 2 被驅動。其結果，在油泵8 2的起動下從上述承油盤吸取 上來的油’是中介著上述油供給通道供給至汽缸罩76的 動閥室內，對設置於此的動閥機構1 〇〇的各部進行潤滑。 對動閥機構1 00的各部進行潤滑後的油，是中介著形 成在汽缸7 4上的回油通道丨3 〇 (參照第3圖）回到曲柄 箱72的上述承油盤。此時，回油通道丨3 〇內的油溫度是 由溫度感測器1 3 2來進行檢測。溫度感測器i 3 2所檢測出 的油溫度’是視爲內燃機3 0的溫度，例如：是利用成爲 燃料噴射閥所噴射的燃料噴射量的控制等。 另一方面’內燃機30，是從形成在底蓋58上的開口 部6 0接受行駛形成的風來進行散熱。 -13- (10) 200424427 如以上所說明，根據本實施形態時，因感測器外罩 1 4 0是保持在汽缸7 4的兩側面，所以即使行駛中受到小 石頭等的碰撞造成對感測器外罩1 4 0施加有過大的載重’ 但也因爲於感測器外罩1 40整體施賦有欲往前後方向轉動 的力，所以該力量就形成爲緩衝，因此能夠避免對小石頭 等所碰撞的部位造成載重的集中。即，可使感測器外罩 1 40變成不易破損，其結果，是能夠保護感測器1 3 2 °200424427 Π) 发明 Description of the invention [Technical field to which the invention belongs] The present invention relates to an internal combustion engine provided with the above-mentioned sensor for detecting the operating state of the internal combustion engine under a substantially horizontally arranged internal combustion engine. [Prior art] Motorcycles (bicycles, mopeds) or tricycles have been equipped with a variety of sensors since the beginning. For example, a transmission mechanism (gearbox) is equipped with a position sensor that can detect the gear shift stage and detect the position of the detected shaft that rotates in response to the change of the gear shift stage (Patent Document 1). Then, Patent Document 1 discloses that a sensor cover is provided in order to prevent the position sensor from colliding with a small stone or the like and causing damage. On the other hand, a configuration is known in which the temperature of an internal combustion engine can be detected, and a temperature sensor is provided in an oil return passage of oil from a cylinder cover to an oil pan or an oil tank (Patent Document 2). [Patent Document 1] Japanese Unexamined Patent Publication No. 10_324 1 71 [(paragraph 0011)]. [Patent Document 2] JP 2000-2 1 3 326 (Scope of patent application). [Summary of the Invention] [Problems to be Solved by the Invention] However, since the prior art, there has been no installation of an internal combustion engine to protect the above-mentioned -5- (2) (2) 200424427 temperature sensing benefit to prevent small stones from colliding. In the case of a motorcycle or a three-wheeled vehicle, the internal combustion engine is a structure that is exposed to the outside in order to achieve the heat dissipation function and to be lightweight. Therefore, the temperature sensor provided on the oil return channel is also exposed to the outside. Therefore, when driving, you may worry that small stones or the like may collide with the temperature sensor. The present invention has been made to solve the above problems, and an object of the present invention is to provide an internal combustion engine which is provided with a sensor for detecting the operating state of the internal combustion engine, and which is easy to assemble and durable and lightweight, and A cover that can efficiently dissipate heat from the sensor and the internal combustion engine. [Means for Solving the Problems] In order to solve the above problems, an internal combustion engine equipped with a sensor for detecting the operating state of the internal combustion engine is disposed in a substantially horizontal portion of the internal combustion engine, and is characterized by having a sensor for the protection of the sensor. The sensor cover holds the sensor cover (the invention described in item 1 of the scope of patent application) on both sides of the cylinder for the internal combustion engine. According to this invention, since the sensor is protected by the sensor cover, the sensor cover is held on both sides of the cylinder, so even if a small stone or the like collides while driving, Excessive load is applied to the sensor cover, but because the sensor cover is applied with a force to rotate in the front-back direction, it is formed as a buffer, so it is possible to avoid the concentration of the load on the collision area such as small stones. That is, it is possible to improve the durability of the sensor cover, and as a result, it is possible to protect the sensor. In this situation, if the sensor housing 'is a plate-shaped member bent in a shape of an L from the front of the cylinder to the rear of (6) (3) (3) 200424427, and can support the plate When the rod-shaped member is formed as a rod-shaped member (the invention described in the second patent application scope), the sensor cover has sufficient durability. In other words, even if the plate-like member has a thin thickness to some extent, it can maintain its durability when used as a sensor cover, so the sensor cover itself can be lightweight. In addition, even if the thickness of each part of the plate-shaped member is somewhat uneven, but because the plate-shaped member is supported by a rod-shaped member as described above, it can obtain a sufficient amount when used as a sensor cover. Durability. That is, since the plate-shaped member is not impossible to be formed with high accuracy, it can be easily and inexpensively manufactured. In addition, since the plate-like member is bent from the front of the cylinder toward the rear to form a substantially L-shape, the front and bottom of the cylinder are covered by it, and the sides and rear of the cylinder are open. In other words, the sensor is protected because it is covered in the front and the bottom with the highest possibility of collision with small stones and the like. On the other hand, since the sides and the rear are open, the area of the cylinder and the sensor that the wind is exposed to during driving will increase, so they can be properly cooled. In addition, on the other hand, it is preferable that at least a part of the shape of the mounting portion on the sensor cover side is formed between the fins formed on the cylinder side mounting portion and the fins formed on the cylinder side portion. It should be the shape between the above-mentioned fins (the invention described in item 3 of the patent application scope). With this configuration, the mounting portion on the sensor cover side is positioned so as to be sandwiched between the heat sinks, so that the rotation of the sensor cover can be prevented. Therefore, '(4) (4) 200424427 For example, when fixing the cylinder and the sensor cover with bolts, it can be fixed at one point on each side, so the number of bolts can be reduced, and the cylinder and the engine can be assembled. The assembly work at the sensor cover is also easy. In addition, in order to fix the mounting portions to each other with bolts, the screw shafts of the bolts are formed so as to be substantially perpendicular to the front and rear of the cylinder, and when the screw shafts are set to be coaxial (patent application scope) The invention described in item 4), because the load caused by the collision of small stones, etc., is approximately equal to the fastening portion of the bolts applied to both ends of the cylinder, so that the twisting of the bolts can be avoided and the durability of the cylinder can be improved. In addition, if a notch is provided on at least one end of the bent portion of the plate-like member (the invention described in claim 5 of the patent application scope), wind received during driving will be caught in the notch and flow into the notch. Inside the sensor housing, the sensor can be cooled directly. In addition, even when the internal combustion engine is covered with a fairing, the space between the sensor housing and the fairing can be ensured due to the provision of the notch, so that it can fully ensure the wind when traveling. Flow, the sensor and cylinder can be efficiently cooled by the wind. In addition, when the sensor cover is formed of metal (the invention described in claim 6 of the patent application scope), the heat from the internal combustion engine can be transmitted to the sensor cover side. Therefore, heat can be released from the surface of the sensor cover by the heat radiation effect, and the internal combustion engine can be properly radiated. [Embodiment] [Embodiment of the invention] -8- (5) (5) 200424427 The following illustrates a drawing of a motorcycle with reference to the appendix, and the embodiment of the present invention will be described in detail below. Fig. 1 is a side view for explaining the overall configuration of a motorcycle 10 to which an embodiment of the present invention is applied. The two-wheeled motor vehicle 10 has a body frame 12 that can be made into a skeleton. The body frame 12 is a combination of a front frame 14 and a rear frame 16. The front frame 14 is composed of a head support tube 18 and a main support tube 20 extending obliquely downward from the head support tube 18 to the rear. A front fork 24 that rotatably supports the front wheel 22 at a lower end portion of the head support tube 18 is operatively supported, and a directional grip 26 is fixed to an upper end portion of the front fork 24. At the lower end portion of the main support pipe 20, an air-cooled internal combustion engine 30 arranged substantially horizontally is supported. The description of the internal combustion engine 30 will be described later. The rear frame 16 is composed of a rear support tube 32 and a seat rail 34 connected to the rear support tube 32. A seat cushion rail 34 is provided with a seat cushion 36 for the driver. In the rear of the internal combustion engine 30, the swing arm 40 is supported to swing up and down. At the rear end of the swing arm 40, the rear wheel 42 is rotatably supported. Between the swing arm 40 and the rear wheel 42, At this time, the buffer is connected to 44 °. However, the side of the main support tube 20 for forming the front frame 14 is covered by the main support tube side cover 50. On both sides of the main support tube side cover 50, leg shields 5 2 ′ covering the driver's feet are detachably mounted. A front cover 5 4 is provided at the front of the main support tube side cover 50 0. A main support tube top cover 5 6 is provided at the rear of the main support -9- (6) (6) 200424427 tube side cover 50. In addition, a bottom cover 5 8 (also referred to as a cowling) that can cover the internal combustion engine 30 is disposed below the main support tube side cover 50. In this case, an opening portion 60 is formed in the front portion of the bottom cover 58 to supply wind to the internal combustion engine 30 during driving. Here, the internal combustion engine 30 will be described. The internal combustion engine 30, as shown in FIG. 2, is basically configured to include a crank case 72, a cylinder 74, a cylinder head 76, and a lubrication system (not shown). In the crank case 72, a crank shaft 80 and an oil pump 82 supported in the left-right direction of the vehicle body are housed. An oil receiving pan (not shown) for storing oil is formed at the bottom of the crank case 72. In this case, the oil pan may be a fuel tank. A cylinder liner 90 is formed inside the cylinder 74, and a piston 92 is slidably fitted into the cylinder liner 90. The piston 92 is connected to the crank shaft 80 through a connecting rod 94. A moving valve chamber (not shown) is formed inside the cylinder head 76, and the moving valve mechanism 100 is housed in the moving valve chamber. The moving valve mechanism 100 is composed of: a camshaft 102 supported on the cylinder head 76 rotatably; an intake cam and an exhaust cam integrally formed on the camshaft 102; and supported by the intake air An intake rocker arm abutting on the suction cam on the rocker arm shaft; an exhaust rocker arm supported on the exhaust rocker arm shaft abutting on the exhaust cam; suction air driven by the intake rocker arm The valve 104 is composed of an exhaust valve 106 and the like driven by the exhaust rocker. A synchronous chain (not shown) is hung on the crank shaft 80 and the cam shaft 102. -10- (7) (7) 200424427 The lubrication system consists of: an oil supply passage (not shown) for supplying oil from the above-mentioned oil receiving plate formed on the crank case 72 to the cylinder head 76; and from the above-mentioned cylinder head 76 An oil return channel 130 (refer to FIG. 3) for returning oil to the oil receiving pan; and the oil pump 82 configured in the crank case 72. The oil return channel 130 connects the oil receiving disc of the crank case 72 and the moving valve chamber of the cylinder head 76 to form a cylinder 74. At the lower part of the cylinder 74, as shown in FIG. 2 and FIG. 3, a temperature sensor 1 32 is provided which communicates with the oil return channel 1 3 0 and detects the oil temperature which is a type of mechanical operation. A sensor housing 140 for protecting the temperature sensor 132 is mounted on the cylinder 74. As shown in Figs. 3 and 4, the sensor cover 140 is composed of an iron rod-like member 142, a steel plate-like member 144, and a steel plate mounting plate 146 (mounting portion). As shown in FIG. 4, the rod-shaped member 142 is formed by bending at four bending portions A to D. As shown in FIG. The plate-shaped member 1 44 is connected to the C-shaped portion 1 4 8 formed by the curved portions A to C, and a muffler 152 is surrounded by a lower portion of the linear portion 150 formed between the curved portions C and D (see (Figure 3) and other auxiliary machinery. In this situation, the positions of the bent portions A to D need to take into consideration the size or arrangement of the temperature sensor 1 3 2 and the width of the cylinder 74, or the arrangement of auxiliary machinery such as the muffler 1 52. The decision is made, but if the decision can be made along the shape of the cylinder 74 as much as possible, the lower space of the cylinder 74 can be made wider. Further, the above-mentioned mounting plates -11-(8) (8) 200424427 1 4 6 are coupled to both ends of the rod-shaped member 142. In this case, it is appropriate to join the rod-like member 1 2 4 with the plate-like member 1 4 4 and the mounting plate 1 46 to increase the strength by welding. The plate-like member 1 4 4 is bent at the bent portion 1 5 4 from the front of the cylinder 74 to the rear, and is formed into a substantially L-shape. A cutout portion 1 5 6 is formed at one end portion of the curved portion 1 5 4 (see FIG. 5). The mounting plate 146 is formed with an insertion hole 158 for the bolt 157 when the sensor cover 140 is to be fixed to the cylinder 74, and the shape of the front end portion 160 of the mounting plate 146 is formed on the cylinder 74 side. Part of the shape of the heat sink 161. That is, in this embodiment, it can be understood from FIGS. 2 and 4 that the heat sinks 161 are arranged substantially in parallel, so that the shape of the front end portion 160 also responds to this and is formed as a side portion. It is a substantially parallel plate-shaped member. On the other hand, as shown in Fig. 4, a part of the heat sink 161 provided on the side of the cylinder 74 is provided. The notch should be formed in accordance with the shape of the mounting plate 146. In the cutout portion, the mounting projections 170, 170 (mounting portions) for mounting the mounting plate 146 are formed integrally with the cylinder 74. The mounting projections 170 and 170 are embedded in the cylinder 74 more than the top of the fins 161. The bolts 1 5 7 are formed at substantially the center of the mounting projections 170 and 170. Used with 1 72 holes (screw shafts). In this case, the respective insertion holes 172, 172 are formed substantially perpendicular to the front-back direction of the cylinder 74, and the respective insertion holes 172, 172 are set coaxially. That is, as can be understood from FIGS. 4 and 6, the sensor cover -12- (9) (9) 200424427 140 is mounted on each of the mounting plates 146 and 146 and the mounting projections 170 and 170 through the mounting plates 146 and 146. On the heat sink 161 on the side of the cylinder 74. As a result, the temperature sensor 1 2 2 is an internal space of the plate-like member 1 44 formed in the bent portion 1 54. That is, the vertical portion of the plate-shaped member 1 4 4 constituting the sensor cover 1 40 is facing the motorcycle. The horizontal portion of the plate-like member 1 44 is facing the road surface to protect the temperature sensor. 132. In addition, both side surfaces of the plate-like member 144 are opened to allow a large air flow. The motorcycle 10 including the internal combustion engine 30 in this embodiment is basically configured as described above, and its operation will be described next. When the internal combustion engine 30 is started by the start operation of the driver, the crank shaft 80 contained in the crank case 72 is rotated. The rotation force of the crank shaft 80 is transmitted through a transmission wheel (not shown), and the oil pump 8 2 is driven. As a result, when the oil pump 82 is started, the oil sucked up from the oil receiving pan is supplied to the actuating valve chamber of the cylinder head 76 through the oil supply passage, and the respective parts of the actuating valve mechanism 100 provided here are supplied. Lubricate. The oil obtained by lubricating the parts of the moving valve mechanism 100 is returned to the above-mentioned oil receiving plate of the crank case 72 via an oil return passage 丨 3 〇 (see Fig. 3) formed in the cylinder 74. At this time, the temperature of the oil in the oil return channel 3 is detected by the temperature sensor 1 32. The oil temperature 'detected by the temperature sensor i 3 2 is regarded as the temperature of the internal combustion engine 30, and is, for example, the control of the amount of fuel injected by a fuel injection valve. On the other hand, the 'internal combustion engine 30' receives heat from the opening 60 formed in the bottom cover 58 to dissipate heat. -13- (10) 200424427 As described above, according to this embodiment, since the sensor cover 1 40 is held on both sides of the cylinder 74, even if a small stone or the like collides while driving, the sensor An excessive load is applied to the sensor cover 1 40 '. However, since a force to rotate forward and backward is applied to the sensor cover 1 40 as a whole, the force is formed as a buffer, so it can avoid collisions with small stones, etc. Location causes concentration of load. That is, the sensor cover 1 40 can be made difficult to break, and as a result, the sensor 1 2 can be protected.
於該狀況時，因感測器外罩1 40構成用的板狀構件 144是由棒狀構件142支撐著，所以感測器外罩14G就具 有充分的耐久性，行駛中小石頭等的碰撞難以造成其破 損。換句話說，板狀構件1 44的板厚即使是爲某程度的薄 時也能夠維持在做爲感測器外罩1 40時的耐久性’因此感 測器外罩1 40本身就能夠成爲輕型。In this case, since the plate-like member 144 for the sensor cover 1 40 is supported by the rod-shaped member 142, the sensor cover 14G has sufficient durability, and it is difficult for it to collide with small stones or the like during driving. damaged. In other words, even if the plate-like member 1 44 has a certain thickness, it can maintain the durability when used as the sensor cover 140. Therefore, the sensor cover 1 40 itself can be lightweight.
再加上，即使板狀構件1 44每個部位的厚度多少有些 不均，但也因如上述，板狀構件1 44是由棒狀構件1 42支 撐著，所以就能獲得在做爲感測器外罩1 40時的充分耐久 性。即，因板狀構件1 44並非得以高精度形成不可，所以 能夠容易並且價廉製造。 此外，板狀構件144，因是從汽缸74的前方指向後 方彎曲形成大致爲L字形狀，所以汽缸74的前方及下方 就爲其所覆蓋，汽缸74的側方及後方是爲開放。即，因 小石頭等碰撞可能性最高的前方及下方是被覆蓋著，所以 溫度感測器1 3 2就會被保護著。另一方面，因側方及後方 是爲開放，所以行駛造成的受風接觸在汽缸7 4及溫度感 -14- (11) (11)200424427 測器1 32上的面積會變大，因此能夠恰當地對兩者進行冷 卻。 又另外，如第4圖及第6圖所示，因是將安裝突面 170埋沒形成在汽缸74兩側部上所形成的散熱片161間 的另一方面，是將安裝板1 46的前端部1 60的形狀應對於 散熱片1 6 1間的形狀，所以前端部1 60是被散熱片1 6 1夾 著定位，因此能夠阻止感測器外罩1 40的旋轉。因此，在 可用削減兩者固定用的螺栓1 5 7數量的同時，在對感測器 外罩140的汽缸74進行組裝時的組裝作業也變容易。 又，如第4圖所示，因是形成在各安裝突面170、 170上的栓入孔172、172的方向形成爲對上述汽缸74的 前後是成大致垂直的同時，各栓入孔172、172是設定成 爲同軸，所以小石頭等碰撞時，其載重是大致均等施加在 汽缸7 4兩端的螺栓1 7 5上，因此，能夠避免螺栓1 7 5的 扭轉，能夠提昇汽缸7 4的耐久性。 此外，如第4圖及第5圖所示，因是在板狀構件144 的彎曲部1 54的至少一端部設有缺口部1 56，所以行駛造 成的受風會被捲入在該缺口部156而流入感測器外罩140 內部，因此能夠直接對溫度感測器1 3 2進行冷卻。再加 上，如第3圖所示，在內燃機3 〇即使是以底蓋5 8包覆著 時，也會因該缺口部1 5 6的設置使感測器外罩1 4 G和底蓋 5 8之間能夠確保有充分空間，所以就能夠充分確保行駛 時的受風流動，能夠效率佳地由該風對溫度感測器1 3 2和 汽缸74進行冷卻。 -15- (12) (12)200424427 又加上，因感測器外罩1 40構成用的棒狀構件1 42、 板狀構件1 4 4及安裝板1 4 6全部均以金屬形成著’所以能 夠將來自於內燃機3 0的熱傳至感測器外罩1 4 0側。因 此，藉由放熱效果可使熱從感測器外罩1 4 0的表面放出， 使內燃機3 0能夠恰當地進行散熱。 再加上，對內燃機3 0的運轉狀態進行檢測的感測 器，並不限定於是對上午油溫度進行檢測的溫度感測器 1 3 2，例如也包括水溫感測器或爆震感測器。然後’理所 當然對於這些感測器，上述感測器外罩1 4 0也能夠如同保 護上述溫度感測器1 3 2般地保護。 另，上述實施形態雖是關於自動二輪車但並不限於 此，例如理所當然也可應在自動三輪車上。 〔發明效果〕 如以上所述，根據本發明時，是能夠保護內燃機30 運轉狀態檢測用的感測器。 再加上，上述感測器外罩，是耐久性高且輕型，其要 安裝在內燃機上時的安裝作業爲容易，並且，能夠效率佳 地使上述感測器及內燃機進行散熱。 【圖式簡單說明】 第1圖爲本發明一實施形態的自動二輪車整體構成說 明用側面圖。 第2圖爲第1圖所示自動二輪車構成用的內燃機側面 -16- (13) 200424427 圖。 第3圖爲從汽缸罩側看第2圖所示的內燃機時該內燃 機的正面圖。 桌4圖爲第3圖所示的感測器外罩，及，該感測器外 罩和汽缸的連接關係說明用分解透視圖。 第5圖爲第4圖所示的板狀構件下面圖。 第6圖爲表示第3圖所示的感測器外罩保持在汽缸側 面上的狀態透視圖。 〔圖號說明〕 1 〇 :自動二輪車 3 〇 :內燃機 58 :底蓋 74 :汽缸 1 3 0 :回油通道 1 3 2 :溫度感測器 140 :感測器外罩 142 :棒狀構件 1 4 4 :板狀構件 1 4 6 :安裝板 1 5 4 :彎曲部 1 5 6 :缺口部 1 6 0 :前端部 1 6 1 :散熱片In addition, even if the thickness of each part of the plate-shaped member 1 44 is somewhat uneven, as described above, the plate-shaped member 1 44 is supported by the rod-shaped member 1 42, so it can be used as a sensor. Device cover 1 40 full durability. That is, since the plate-like member 144 cannot be formed with high accuracy, it can be easily and inexpensively manufactured. In addition, since the plate-like member 144 is bent from the front of the cylinder 74 toward the rear and formed into an approximately L-shape, it covers the front and the bottom of the cylinder 74, and the side and the rear of the cylinder 74 are open. That is, since the front and the bottom with the highest possibility of collision such as small stones are covered, the temperature sensor 1 2 2 is protected. On the other hand, since the sides and the rear are open, the area of the cylinder 74 and the temperature sensation caused by the wind when driving will be increased. Cool both properly. In addition, as shown in FIGS. 4 and 6, the mounting projection 170 is buried between the fins 161 formed on both sides of the cylinder 74, and the front end of the mounting plate 1 46 The shape of the portion 160 should correspond to the shape between the heat sinks 161. Therefore, the front end portion 160 is positioned and sandwiched by the heat sinks 161, so that the rotation of the sensor cover 140 can be prevented. Therefore, it is possible to reduce the number of bolts 1 5 7 for fixing both, and to facilitate assembly work when assembling the cylinder 74 of the sensor cover 140. In addition, as shown in FIG. 4, the directions of the bolt holes 172 and 172 formed in the mounting projections 170 and 170 are formed so as to be substantially perpendicular to the front and rear of the cylinder 74 and the bolt holes 172 The 172 and 172 are set to be coaxial, so when a small stone or the like collides, its load is approximately evenly applied to the bolts 17 5 at both ends of the cylinder 7 4. Therefore, the twist of the bolts 17 5 can be avoided and the durability of the cylinder 7 4 can be improved Sex. In addition, as shown in FIGS. 4 and 5, a notch portion 156 is provided on at least one end portion of the curved portion 154 of the plate-like member 144, so that wind received during driving is caught in the notch portion. 156 flows into the inside of the sensor cover 140, so that the temperature sensor 1 3 2 can be directly cooled. In addition, as shown in FIG. 3, even when the internal combustion engine 3 is covered with the bottom cover 5 8, the sensor cover 1 4 G and the bottom cover 5 are caused by the provision of the notch portion 1 6 6. Since a sufficient space can be ensured between 8 and 8, the wind flow during driving can be sufficiently ensured, and the temperature sensor 1 2 2 and the cylinder 74 can be efficiently cooled by the wind. -15- (12) (12) 200424427 In addition, the rod-shaped member 1 42, the plate-shaped member 1 4 4 and the mounting plate 1 4 6 for the sensor cover 1 40 are all formed of metal. The heat from the internal combustion engine 30 can be transferred to the sensor cover 140 side. Therefore, heat can be released from the surface of the sensor cover 140 by the heat radiation effect, so that the internal combustion engine 30 can properly dissipate heat. In addition, the sensor that detects the operating state of the internal combustion engine 30 is not limited to the temperature sensor 1 3 2 that detects the morning oil temperature, for example, it also includes a water temperature sensor or a knock sensor. . Then, as a matter of course, for these sensors, the above-mentioned sensor cover 1 40 can be protected as well as the above-mentioned temperature sensor 1 32. The above-mentioned embodiment is not limited to the two-wheeled motor vehicle, and may be applied to a three-wheeled motor vehicle as a matter of course. [Effects of the Invention] As described above, according to the present invention, it is a sensor capable of protecting the operation state detection of the internal combustion engine 30. In addition, the sensor cover is highly durable and lightweight. It is easy to install when it is mounted on an internal combustion engine, and it is possible to efficiently dissipate the sensor and the internal combustion engine. [Brief description of the drawings] Fig. 1 is a side view for explaining the overall configuration of a motorcycle according to an embodiment of the present invention. Fig. 2 is a side view of the internal combustion engine used in the construction of the motorcycle shown in Fig. -16- (13) 200424427. Fig. 3 is a front view of the internal combustion engine when the internal combustion engine shown in Fig. 2 is viewed from the cylinder head side. Table 4 is a sensor cover shown in FIG. 3 and an exploded perspective view for explaining the connection relationship between the sensor cover and the cylinder. Fig. 5 is a bottom view of the plate-like member shown in Fig. 4. Fig. 6 is a perspective view showing a state where the sensor cover shown in Fig. 3 is held on the side of the cylinder. [Illustration of drawing number] 1 0: Two-wheeled vehicle 3 0: Internal combustion engine 58: Bottom cover 74: Cylinder 1 3 0: Oil return channel 1 3 2: Temperature sensor 140: Sensor cover 142: Rod-shaped member 1 4 4 : Plate-shaped member 1 4 6: Mounting plate 1 5 4: Bend portion 1 5 6: Notched portion 1 6 0: Front end portion 1 6 1: Heat sink
-17- (14)200424427 170 :安裝突面 172 :栓入孔-17- (14) 200424427 170: Mounting protrusion 172: Bolt hole
-18--18-