1360607 六、發明說明： 【發明所屬之技術領域】 本發明係有關於裝設於諸如摩拖車之類的車輛上的內 燃機的冷卻片構造。 【先前技術】 裝設在諸如摩拖車之類的車輛上的內燃機的汽缸體和 汽缸頭，在他們的表面上設有冷卻片’用以藉由空氣流來 冷卻該內燃機。由於冷卻片相當的薄，相鄰的冷卻片間要 由補強肋加以連接，增強冷卻片的剛性，以使得這些片體 不會因爲風而產生聲音及振動，並增藉由該等補強肋來增 加熱幅射面積》此種冷卻片構造在專利文獻1中有所說明 〇 專利文獻1 :日本專利JP 8-7070 U。 【發明內容】 本發明要解決的問題： 一種在其外側表面上設有由補強突起部連接起來的冷 卻片的車輛攜載內燃機，具有一上方表面，具有由該等冷 卻片及補強突起部所界定出而配置成格栅狀的凹入部。砂 及泥巴很容易聚積於該等凹入部內而減損引擎的冷卻能力 。再者，很不容易將聚積的砂及泥巴加以去除掉，以清理 該等凹入部。目前曾有人企圖將每一補強突起部的一部份 形成爲高度低於冷卻片，希望能將該一問題的不利影響減 1360607 少到某一種程度。但是，凹入部仍然沒有改變，因此前述 的問題並無法完全解決。 本發明是要解決前述的問題，而本發明的目的在於提 供一種車輛攜載內燃機用的冷卻片構造，其中砂及泥巴不 容易聚積於其內，且其可使該冷卻片構造能輕易地清理， 並防止冷卻的降低。 解決問題的手段 本發明提供一種車輛攜載內燃機的冷卻片構造，包含 有以平行配置方式形成於該車輛攜載內燃機的至少一上方 表面上的冷卻片，其中該等冷卻片每一者係在其表面上設 有補強突起部；以及每一冷卻片上的補強突起部係與相鄰 的冷卻片分離開，並與位於該相鄰冷卻片上的補強突起部 分離開。 最好，該等平行冷卻片中相鄰者上的各補強突起部係 以交錯方式排列。 最好，該等補強突起部係形成爲能讓相鄰冷卻片上的 各補強突起部，在自沿著該等冷卻片之長度的方向視之時 ，是不互相重疊的。 在本發明一實施例中，該車輛攜載內燃機具有向前傾 斜或大致上水平的汽缸，係懸吊於自設於一摩托車內之一 頭管傾斜向下延伸至後方的一主支架上，並設有一用以將 空氣吸取進入該引擎內的空氣進氣系統，包含有設置於一 汽缸頭之上方表面與該主支架之間的部件，以及該等冷卻 -6- 1360607 片係沿著該摩托車前進的方向延伸。 一般而言，該等冷卻片中的最外側一者，至少在其一 外側表面上，不設置補強突起部。 本發明的效果 本發明的冷卻片是在其等的表面上設有補強突起部》 因此，透過該等補強突起部可以增進該等冷卻片的剛性， 因之可以防止該等冷卻片產生聲音及噪音（減少聲音及噪 音）。該等補強突起部可增加冷卻片的表面積，以改善冷 卻的能力。本發明的冷卻片構造不同於習用的冷卻片構造 之處在於，冷卻片上的補強突起部是與相鄰的冷卻片分離 開，並與該等相鄰冷卻片上的補強突起部分離開。因此， 該等相鄰冷卻片並未由補強突起部加以連接在一起，因此 該等冷卻片及該等補強突起部並未形成凹入部。因此之故 ，在該等冷卻片中相鄰者之間會形成連續的底壁，延伸通 過該等冷卻片之長度。因此，進入至該等冷卻片中相鄰者 之間的該等空間內的砂石及塵土顆粒及泥巴將不容易聚積 在該等空間內，而且即使砂石及塵土顆粒及泥巴聚積在這 些空間內，也能輕易地以水加以沖洗掉。 由於該等平行之冷卻片中相鄰者的補強突起部係以交 錯方式排列，因此可以將補強突起部對於該等冷卻片中相 鄰者間的空氣通道之截面積所造成的縮減情形限制於最小 的程度，而進入至該等冷卻片中相鄰者間之空間內的較大 砂石顆粒及泥巴塊則幾乎不會被補強突起部卡住，能夠輕 1360607 易地在該空間內滾動’並輕易地離開該空間。因此’該等 冷卻片中相鄰者間的空氣通道將能輕易地清理。由於這些 空氣通道並未縮狹’因此空氣可以輕易地流經過這些空氣 通道。 由於補強突起部係配置成能讓相鄰之冷卻片上各自的 補強突起部在沿著冷卻片之長度的方向上並不互相重合， 因此冷卻空氣可以輕易地流通過形成於相鄰冷卻片之間的 每一空間，而砂石及泥巴塊則幾乎不會卡在相鄰冷卻片之 間的每一該等空間內，且該等空間可以輕易地清理。 此車輛攜載內燃機是懸吊在自摩托車之頭管傾斜向下 延伸至後方的主支架上，並設有一用以吸取空氣進入引擎 內的空氣進氣系統，包含有設置於一汽缸頭之上方表面與 該主支架之間的部件。因此，在車輛運動時附著於主支架 及空氣進氣系統該等部件上的雨水會輕易地滴落至位於該 內燃機上方部位上的冷卻片構造上。雨水及滴落至冷卻片 構造上者可輕易地沿著車輛運動方向流動，並自冷卻片構 造上分離開，因爲冷卻片及補強突起部並未構成分隔開的 凹入部。 當該等冷卻片中的最外側者至少在其等的外側表面上 不設置的補強突起部時，該冷卻片構造會具有較佳的外觀 【實施方式】 下文中將配合所附圖式來說明根據本發明之車輛攜載 -8- 1360607 內燃機的冷卻片構造。 第1圖顯示出一摩托車’設有一具有根據本發明一較 佳實施例之冷卻片構造的內燃機。參閱第1圖，摩托車1 具有一本體支架，其主要構件包含有一用以支撐前輪2的 前叉3、一連接至前叉3上方部位上的頭管4、一自頭管4 傾斜向下延伸至後方的主支架5、以及一連接至主支架5 後側末端上並以向上突起之形狀彎曲而傾斜向上朝向後方 延伸的承載支架6，其等結合成一單元，以構成該本體支 架。前叉3的上方部位係可轉動地裝設於頭管4上。一橫 向的把手7設置於頭管4的上方。一座位8設置於後方支 架6的上方。參考編號9代表的是一本體罩蓋。 內燃機1〇是設置於主支架5的下方，並係被支撐成 使其汽缸軸線向前傾斜而以一小傾斜度朝向前方升高，或 是其軸線大致上水平延伸。內燃機包含有一曲柄軸箱 11、一汽缸體12、一汽缸頭13、以及一頭蓋14。一鏈條 箱15自曲柄軸箱11向後方延伸。一後輪16支撐於該鏈 條箱1 5的後側末端部位上。該鏈條箱1 5的後側末端由一 避震器17加以連接至後方支架6的後方部位上。一腿擋 蓋18跨設於主支架5上而在橫向方向上遮蓋住內燃機1〇 的汽缸體1 2及汽缸頭1 3。後方支架6是由一後側罩蓋1 9 加以遮蓋住。座位8是設置於後側罩蓋1 9上。 內燃機10是懸吊於主支架5上。參閱以放大比例顯 示出第1圖中之一部份的第2圖，內燃機10具有一向前 傾斜或大致上水平的汽缸，一空氣進氣系統20連接至汽 -9- 1360607 缸頭13的上方部位上。空氣進氣系統20包含有一進氣管 21、一節流閥22、一空氣清潔器23等等。吸入的空氣會 流經過空氣清潔器23、空氣進氣系統20、以及汽缸頭13 而進入至該汽缸內。一噴射器24將燃料噴射進入吸入的 空氣內。空氣進氣系統20是設置於主支架5的下方；也 就是說，空氣進氣系統20是設置於主支架5與汽缸頭13 之間的空間內。如以平面圖顯示出內燃機10的第7圖所 示，用以供空氣冷卻內燃機10的冷卻片30是形成於汽缸 體12的上方表面上。這些冷卻片30構成本發明特徵的冷 卻片構造3 1 ^ 第7圖顯示出空氣進氣系統20的進氣管25»用以將 燃料攜行至噴射器24的燃料管26是連接至一接合蓋27 上。在第7圖中，參考編號28是用以連接噴射器24之電 子儀器的連接器，而參考編號29是節流閥本體。英文字 母F代表本體支架內的假想空氣流。如圖所示，本體罩蓋 9是朝向前側開放，以有助於吸入冷卻空氣。 現在將配合於第3圖至第5圖來說明冷卻片構造31。 第3圖是汽缸體1 2自車輛左側所取的側視圖。由冷卻片 構造31所構成的冷卻片構造31是形成於汽缸體12的上 方表面上。在此實施例中，汽缸體12的左側表面上不設 有任何的冷卻片。參考編號3 3代表界定出汽缸內徑的汽 缸襯套。汽缸襯套3 3係朝向後方延伸。如以平面圖顯示 出冷卻片構造31的第4圖中可看到的，冷卻片構造31的 冷卻片30係平行於車輛運動方向延伸的。在此實施例中 -10- 1360607 ，汽缸體12的右側表面上設有如第4圖所示的冷卻片32 。冷卻片32將於稍後再加以說明。 如自第4圖中可看到的，此實施例中的冷卻片構造31 的冷卻片30的數量是例如說六片。這些平行的冷卻片30 沿著車輛的運動方向延伸。補強肋或突起部34係與冷卻 片30 —體成形而形成於冷卻片30的表面上。每一補強突 起部34是沿著冷卻片30的高度垂直地延伸。補強突起部 34的表面在水平平面上的截面形狀是圓弧狀。最好補強突 起部34具有一彎弧部位，自冷卻片30的平直表面緩和地 上升。建議避免使用具有彎角之截面的補強突起部。相鄰 的冷卻片30上的各補強突起部34並未在垂直於冷卻片30 的方向上互相相對，亦即未在沿著車輛寬度的方向上互相 相對。 補強突起部3 4的高度是遠小於相鄰冷卻片3 0間的距 離。因此，即使相鄰冷卻片30上的各補強突起部34在垂 直於冷卻片30的方向上是互相相對的，在相對補強突起 部34間仍有一間隙；也就是說，補強突起部34是形成爲 能讓相鄰冷卻片3 0上的補強突起部3 4互相分隔開而使相 鄰冷卻片30上的各補強突起部34在垂直於冷卻片30的 方向上不會互相相對。相鄰之冷卻片30中之一者上的補 強突起部34並未連接至另一冷卻片30之表面上未設有補 強突起部34的部位上。 如自顯示出沿著第4圖中線V-V所取之放大剖面圖的 第5圖中可看到的，補強突起部3 4的長度是稍微地小於 -11- 1360607 該等補強突起部34形成於其上的冷卻片30的高度。每一 補強突起部34均是以一緩和曲線自冷卻片30上稍微低於 冷卻片30頂側邊緣的部位處逐漸地突起，再線性地向下 延伸至位於相鄰冷卻片30間的底壁35處。重要的是決定 尺寸，以使得相鄰冷卻片30的各補強突起部34自平行於 冷卻片30長度之方向，亦即進入至紙張內的方向，視之 不會互相重合。在如此形成補強突起部34時，沿著平行 於冷卻片30長度之方向連續地延伸的平直的底壁35會形 成於相鄰的冷卻片30之間。第5圖中右半部中所示出的 右側末端冷卻片30並未設有補強突起部34。因此，右側 底壁35看起來是比左側底壁35寬一些。事實上，在第5 圖中，二個互相相對的補強突起部34在冷卻片30的長度 上並未形成於相同的位置處。因此，左側底壁35在每一 補強突起部34處的寬度實際上是等於右側底壁35者。此 曲折狀的底壁35在對應於該寬度處具有有著最小寬度的 部位，是沿著車輛之運動方向延伸的。 第6圖是汽缸體12自車輛前側所取的末端視圖。汽 缸體12的上方表面上設有如第6圖所示之包含冷卻片30 及補強突起部34的冷卻片構造31。一供未顯示出之正時 鏈條穿過其間的空間3 9，顯示於第6圖的右側，亦即相對 於車輛運動方向的左側。如一般所知，正時鏈條是延伸於 —未顯示出而裝設於曲柄軸箱11內之曲柄軸上的驅動鏈 輪與一未顯示出而裝設於設在閥門列腔室內之凸輪軸上的 被動鏈輪之間，以供將曲柄軸的旋轉傳遞至凸輪軸上。冷 -12-1360607 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a cooling fin structure of an internal combustion engine mounted on a vehicle such as a motorcycle trailer. [Prior Art] A cylinder block and a cylinder head of an internal combustion engine mounted on a vehicle such as a motorcycle trailer are provided with cooling fins on their surfaces for cooling the internal combustion engine by air flow. Since the cooling fins are relatively thin, the adjacent cooling fins are connected by reinforcing ribs to enhance the rigidity of the cooling fins, so that the flakes do not generate sound and vibration due to the wind, and the reinforcing ribs are added by the reinforcing ribs. Increasing the heat radiation area. Such a cooling sheet structure is described in Patent Document 1: Patent Document 1: Japanese Patent JP 8-7070 U. SUMMARY OF THE INVENTION Problems to be Solved by the Invention: A vehicle-carrying internal combustion engine having cooling fins connected by reinforcing projections on an outer side surface thereof has an upper surface having the cooling fins and reinforcing projections A recessed portion that is arranged in a grid shape is defined. Sand and mud can easily accumulate in these recesses and detract from the cooling capacity of the engine. Furthermore, it is not easy to remove the accumulated sand and mud to clean the recesses. At present, attempts have been made to form a portion of each reinforcing protrusion to a height lower than that of the cooling fin, hoping to reduce the adverse effect of the problem by a factor of 1360607 to a certain extent. However, the recess has not changed, so the aforementioned problems cannot be completely solved. The present invention is to solve the aforementioned problems, and an object of the present invention is to provide a cooling fin structure for a vehicle carrying an internal combustion engine, in which sand and mud are not easily accumulated therein, and the cooling fin structure can be easily cleaned. And prevent the cooling from decreasing. Means for Solving the Problems The present invention provides a cooling fin structure for a vehicle-carrying internal combustion engine, comprising a cooling fin formed in a parallel arrangement on at least one upper surface of the vehicle-carrying internal combustion engine, wherein the cooling fins are each tied to Reinforcing protrusions are provided on the surface; and the reinforcing protrusions on each of the cooling fins are separated from the adjacent cooling fins and are separated from the reinforcing projections on the adjacent cooling fins. Preferably, the reinforcing projections on the adjacent ones of the parallel fins are arranged in a staggered manner. Preferably, the reinforcing projections are formed such that the reinforcing projections on the adjacent cooling fins do not overlap each other when viewed from a direction along the length of the cooling fins. In an embodiment of the present invention, the vehicle-carrying internal combustion engine has a forwardly inclined or substantially horizontal cylinder suspended from a main bracket that is inclined downwardly and rearwardly from a head tube disposed in a motorcycle. And an air intake system for drawing air into the engine, comprising a component disposed between the upper surface of the cylinder head and the main bracket, and the cooling -6 - 1360607 piece along the The direction in which the motorcycle advances extends. In general, the outermost one of the cooling fins is provided with no reinforcing projections on at least one of its outer side surfaces. EFFECTS OF THE INVENTION The cooling fin of the present invention is provided with reinforcing projections on the surface thereof. Therefore, the rigidity of the cooling fins can be enhanced by the reinforcing projections, thereby preventing the cooling fins from generating sound and Noise (reduced sound and noise). These reinforcing projections increase the surface area of the cooling fins to improve the ability to cool. The cooling fin construction of the present invention differs from the conventional cooling fin construction in that the reinforcing projections on the cooling fin are separated from the adjacent cooling fins and are separated from the reinforcing projections on the adjacent cooling fins. Therefore, the adjacent cooling fins are not joined by the reinforcing projections, and therefore the cooling fins and the reinforcing projections do not form a concave portion. For this reason, a continuous bottom wall is formed between adjacent ones of the cooling fins, extending through the length of the cooling fins. Therefore, sand and dust particles and mud entering the spaces between adjacent ones of the cooling fins will not easily accumulate in the spaces, and even sand and dust particles and mud accumulate in these spaces. It can also be easily rinsed off with water. Since the reinforcing protrusions of the adjacent ones of the parallel cooling fins are arranged in a staggered manner, the reduction of the cross-sectional area of the air passage between the adjacent ones of the cooling fins can be limited to At the minimum extent, the larger sandstone particles and mud blocks that enter the space between the adjacent ones of the cooling fins are hardly caught by the reinforcing protrusions, and can easily roll in the space 1360607' And easily leave the space. Therefore, the air passage between adjacent ones of the cooling fins can be easily cleaned. Since these air passages are not narrowed, air can easily flow through these air passages. Since the reinforcing protrusions are arranged such that the respective reinforcing protrusions on the adjacent cooling fins do not coincide with each other in the direction along the length of the cooling fin, the cooling air can easily flow through between the adjacent cooling sheets. Each space, while the gravel and mud blocks are hardly stuck in each of the spaces between adjacent cooling fins, and the spaces can be easily cleaned. The vehicle carrying internal combustion engine is suspended from a main bracket extending obliquely downward from the head pipe of the motorcycle to the rear, and is provided with an air intake system for sucking air into the engine, which is disposed on a cylinder head. The component between the upper surface and the main bracket. Therefore, rainwater adhering to the main bracket and the air intake system components during the movement of the vehicle can be easily dropped onto the cooling fin structure located above the internal combustion engine. Rainwater and dripping onto the cooling fins can easily flow in the direction of vehicle motion and separate from the cooling fin construction because the cooling fins and the reinforcing projections do not form separate recesses. When the outermost one of the cooling fins has a reinforcing protrusion which is not provided at least on the outer side surface thereof, the cooling fin structure has a better appearance. [Embodiment] Hereinafter, the following description will be given in conjunction with the drawings. The vehicle according to the present invention carries the cooling fin construction of the-8-1360607 internal combustion engine. Figure 1 shows a motorcycle having an internal combustion engine having a cooling fin construction in accordance with a preferred embodiment of the present invention. Referring to Figure 1, the motorcycle 1 has a body bracket, the main components of which include a front fork 3 for supporting the front wheel 2, a head pipe 4 connected to the upper portion of the front fork 3, and a head tube 4 inclined downward. The main bracket 5 extending to the rear and a carrier bracket 6 connected to the rear end of the main bracket 5 and bent in an upwardly convex shape and inclined upwardly and rearward are combined into a unit to constitute the body bracket. The upper portion of the front fork 3 is rotatably mounted on the head pipe 4. A lateral handle 7 is disposed above the head tube 4. A seat 8 is disposed above the rear bracket 6. Reference numeral 9 represents a body cover. The internal combustion engine 1 is disposed below the main bracket 5 and is supported such that its cylinder axis is inclined forward to rise toward the front with a small inclination, or its axis extends substantially horizontally. The internal combustion engine includes a crankcase 11, a cylinder block 12, a cylinder head 13, and a head cover 14. A chain case 15 extends rearward from the crankcase 11. A rear wheel 16 is supported on the rear end portion of the chain case 15. The rear end of the chain case 15 is connected to the rear portion of the rear bracket 6 by a shock absorber 17. The one-leg cover 18 is disposed on the main bracket 5 to cover the cylinder block 12 and the cylinder head 13 of the internal combustion engine 1 横向 in the lateral direction. The rear bracket 6 is covered by a rear side cover 19. The seat 8 is provided on the rear side cover 19. The internal combustion engine 10 is suspended from the main frame 5. Referring to Fig. 2, which shows a portion of Fig. 1 on an enlarged scale, the internal combustion engine 10 has a forwardly inclined or substantially horizontal cylinder, and an air intake system 20 is connected to the upper portion of the vapor-9-1360607 cylinder head 13. On the part. The air intake system 20 includes an intake pipe 21, a throttle valve 22, an air cleaner 23, and the like. The inhaled air flows through the air cleaner 23, the air intake system 20, and the cylinder head 13 into the cylinder. An injector 24 injects fuel into the inhaled air. The air intake system 20 is disposed below the main bracket 5; that is, the air intake system 20 is disposed in a space between the main bracket 5 and the cylinder head 13. The cooling fins 30 for air-cooling the internal combustion engine 10 are formed on the upper surface of the cylinder block 12 as shown in a plan view of the internal combustion engine 10 in a plan view. These cooling fins 30 constitute a cooling fin construction of the present invention. 3 1 Fig. 7 shows that the intake pipe 25» of the air intake system 20 is used to carry fuel to the injector 24. The fuel pipe 26 is connected to an engagement. Cover 27 on. In Fig. 7, reference numeral 28 is a connector for connecting an electronic instrument of the injector 24, and reference numeral 29 is a throttle body. The English letter F represents the imaginary air flow in the body bracket. As shown, the body cover 9 is open toward the front side to assist in drawing in cooling air. The cooling fin structure 31 will now be described with reference to Figs. 3 to 5. Figure 3 is a side view of the cylinder block 12 taken from the left side of the vehicle. The cooling fin structure 31 composed of the cooling fin structure 31 is formed on the upper surface of the cylinder block 12. In this embodiment, no cooling fins are provided on the left side surface of the cylinder block 12. Reference numeral 3 3 represents a cylinder liner defining the inner diameter of the cylinder. The cylinder liner 3 3 extends rearward. As can be seen in the fourth view of the cooling fin construction 31 in plan view, the cooling fins 30 of the cooling fin construction 31 extend parallel to the direction of motion of the vehicle. In this embodiment, -10- 1360607, the cooling plate 32 as shown in Fig. 4 is provided on the right side surface of the cylinder block 12. The cooling fins 32 will be described later. As can be seen from Fig. 4, the number of cooling fins 30 of the cooling fin construction 31 in this embodiment is, for example, six sheets. These parallel cooling fins 30 extend in the direction of movement of the vehicle. The reinforcing ribs or projections 34 are integrally formed with the cooling fins 30 to be formed on the surface of the cooling fins 30. Each of the reinforcing projections 34 extends vertically along the height of the cooling fins 30. The cross-sectional shape of the surface of the reinforcing projection 34 on the horizontal plane is an arc shape. Preferably, the reinforcing projection 34 has an arcuate portion which gently rises from the flat surface of the cooling fin 30. It is recommended to avoid the use of reinforcing protrusions with curved corners. The reinforcing projections 34 on the adjacent cooling fins 30 are not opposed to each other in the direction perpendicular to the cooling fins 30, i.e., are not opposed to each other in the direction along the width of the vehicle. The height of the reinforcing projections 34 is much smaller than the distance between adjacent cooling fins 30. Therefore, even if the reinforcing projections 34 on the adjacent cooling fins 30 are opposed to each other in the direction perpendicular to the cooling fins 30, there is still a gap between the opposing reinforcing projections 34; that is, the reinforcing projections 34 are formed. In order to allow the reinforcing projections 34 on the adjacent cooling fins 30 to be spaced apart from each other, the reinforcing projections 34 on the adjacent cooling fins 30 do not face each other in a direction perpendicular to the cooling fins 30. The reinforcing projections 34 on one of the adjacent cooling fins 30 are not connected to the portion of the other cooling fin 30 where the reinforcing projections 34 are not provided. As can be seen from Fig. 5 showing the enlarged cross-sectional view taken along the line VV of Fig. 4, the length of the reinforcing projections 34 is slightly smaller than -11 - 1360607, and the reinforcing projections 34 are formed. The height of the cooling fins 30 thereon. Each of the reinforcing protrusions 34 gradually protrudes from a portion of the cooling fin 30 slightly lower than the top side edge of the cooling fin 30 in a gentle curve, and then linearly extends downward to the bottom wall between the adjacent cooling fins 30. 35 places. It is important to determine the size so that the reinforcing projections 34 of the adjacent cooling fins 30 do not coincide with each other from the direction parallel to the length of the cooling fins 30, i.e., into the direction of the inside of the sheet. When the reinforcing projections 34 are thus formed, a flat bottom wall 35 extending continuously in the direction parallel to the length of the cooling fins 30 is formed between the adjacent cooling fins 30. The right end fins 30 shown in the right half of Fig. 5 are not provided with the reinforcing projections 34. Therefore, the right bottom wall 35 appears to be somewhat wider than the left bottom wall 35. In fact, in Fig. 5, the two mutually opposing reinforcing projections 34 are not formed at the same position over the length of the cooling fins 30. Therefore, the width of the left bottom wall 35 at each of the reinforcing projections 34 is substantially equal to the right bottom wall 35. The meandering bottom wall 35 has a portion having a minimum width corresponding to the width and extends in the direction of movement of the vehicle. Figure 6 is an end view of the cylinder block 12 taken from the front side of the vehicle. The upper surface of the cylinder block 12 is provided with a cooling fin structure 31 including a cooling fin 30 and a reinforcing projection 34 as shown in Fig. 6. A timing for which the chain is not shown is displayed on the right side of Fig. 6, that is, to the left side with respect to the direction of movement of the vehicle. As is generally known, the timing chain extends over a drive sprocket that is not shown and mounted on the crankshaft in the crankcase 11 and a camshaft that is not shown and is mounted in the chamber of the valve train. Between the passive sprocket wheels for transmitting the rotation of the crankshaft to the camshaft. Cold -12-
1360607 卻片32是顯示於第6圖的左側部位內。這些冷卻片 含有垂直於汽缸軸線的平行垂直冷卻片32a及平行] 軸線而連接相鄰之冷卻片32a的補強肋32b。補強丨 的高度是低於冷卻片32a的高度。 如第6圖中亦顯示出的，汽缸體1.2的下方表面 有結構上類似於冷卻片32的冷卻片40a，以及垂直於 軸線並連相鄰冷卻片40a的補強肋40b。補強肋40b 度是低於冷卻片4〇a的高度。每一補強肋40b具有一 內凹邊緣。冷卻片32及40基本上具有依據專利文獻 所提及之相同原則的冷卻片構造。 本發明之較佳實施例中的供車輛攜載內燃機用的 片構造是由前述之結構所構成的。當車輛移動時，流 空氣流會通過頭蓋14、汽缸頭13、汽缸體12、以及 軸箱11，以供冷卻內燃機10。補強突起部34是形成 卻片30表面上而與之形成爲一體，以使得冷卻片30 各補強突起部34不連接至相鄰的冷卻片30及相鄰冷 30的補強突起部34上。因此，透過補強突起部34可 冷卻片3 0的剛性，且補強突起部3 4可增加冷卻片構 的表面積，以改善冷卻能力。由於相鄰的冷卻片30 於習用的冷卻片，並未由補強突起部34加以連接起 冷卻片30及補強突起部34不會構成分隔開的凹入 延伸通過冷卻片30之長度的連續底壁35則是形成 片30中相鄰者之間。因此，進入至相鄰冷卻片30 間內的砂石及塵土顆粒及泥巴不容易聚積在這些空間 32包 汽缸 I 32b 上設 汽缸 的高 向外 1中 冷卻 入的 曲柄 於冷 上的 卻片 增強 造31 不同 來， ，而 冷卻 的空 內， -13- 1360607 而且即使砂石及塵土顆粒及泥巴聚積在這些空間內，也能 輕易地以水加以沖洗掉。具有緩和曲弧段的補強突起部34 僅會對於空氣流造成低阻力。 相鄰之冷卻片30的各補強突起部34係以交錯方式排 列，因此可以將補強突起部34對於形成於相鄰冷卻片30 間的空氣通道之截面積所造成的縮減情形限制於最小程度 ，而進入至相鄰冷卻片30間之空間內的較大砂石顆粒及 泥巴塊則幾乎不會被補強突起部34卡住，能夠輕易地在 這些空間內滾動，並輕易地離開這些空間。因此，每一個 位於相鄰冷卻片間的空氣通道將能輕易地清理。由於這些 空氣通道並未縮狹，因此空氣可以輕易地流經過這些空氣 通道。 由於相鄰之冷卻片30上的各補強突起部34在自平行 於冷卻片30之長度的方向視之並不互相重疊，因此冷卻 空氣可以平順地流通過相鄰冷卻片3 0間的空間，而砂石 顆粒及泥巴塊則幾乎不會卡在該等空間內，因此該等空間 可以輕易地清理。 在所示的實施例中，內燃機10是懸吊在自摩托車之 頭管4傾斜向下延伸至後方的主支架5下方，而空氣進氣 系統20則是設置於主支架5與汽缸頭13之間的空間內。 因此，在車輛運動時附著於主支架5及空氣進氣系統20 上的雨水會輕易地滴落至位於內燃機10上方部位上的冷 卻片構造31上。雨水及滴落至冷卻片構造31上者可輕易 地沿著車輛運動方向流動，並自冷卻片構造31上分離開 -14- 1360607 ，因爲冷卻片30及補強突起部34並未構成分隔開的凹入 部，而是形成沿著該運動方向延伸的連續底壁35。 在所示的實施例中，例如說，左側末端的冷卻片30, 亦即車輛寬度上的最外側冷卻片30，是如第4圖所示般， 在其相對的表面上設有補強突起部34。此最外側冷卻片 30可以完全不設置任何的補強突起部34，或是在其在車 輛寬度上的外側表面上不設置任何的補強突起部34;也就 是說，該最外側冷卻片30的至少該車輛寬度上的外側表 面是不設有補強突起部34，這可改善設有冷卻片構造31 之引擎的外觀。 在所示的本發明實施例中，該冷卻片構造係僅形成於 的汽 頭於 缸成 汽形 於可 成亦。 形造± 可構® 亦片表 造卻ft& 構冷^f 片該的 卻’外 冷時以 該要面 。需表 上有方 面在上 表且之 方，頭 上上缸 的面汽 體表及 缸方體 汽上缸 【圖式簡單說明】 第1圖是一摩托車的側視圖，其設有一具有本發明較 佳實施例之冷卻片構造的內燃機。 第2圖是第1圖中一部份的放大側視圖，包括該內燃 機及一進氣系統。 第3圖是設於第2圖中所示之內燃機內的汽缸體的側 視圖。 第4圖是第3圖中所示之具有本發明之冷卻片構造的 汽缸體的平面圖。 -15- 1360607 第5圖是沿著第4圖中線V-V所取的剖面圖。 第6圖是沿著運動方向自前側觀之的該汽缸體頂視圖 〇 第7圖是該車輛攜載內燃機的平面圖。 【主要元件符號說明】 1 :摩托車 2 :前輪 φ 3 :前叉 4 :頭管 5 :主支架 6 :後方支架 7 :把手 8 :座位 9 :本體罩蓋 1 〇 :內燃機 籲 1 1 :曲柄軸箱 1 2 :汽缸體 13 :汽缸頭 1 4 :頭蓋 1 5 :鏈條箱 1 6 :後輪 17 :避震器 18 :腿擋蓋 -16-1360607 The piece 32 is shown in the left part of Fig. 6. These fins contain parallel vertical fins 32a perpendicular to the cylinder axis and parallel reinforcing shafts 32b connecting the adjacent fins 32a. The height of the reinforcing raft is lower than the height of the cooling fins 32a. As also shown in Fig. 6, the lower surface of the cylinder block 1.2 has a cooling fin 40a structurally similar to the cooling fins 32, and reinforcing ribs 40b perpendicular to the axis and adjacent to the adjacent cooling fins 40a. The reinforcing rib 40b is lower than the height of the cooling fins 4A. Each reinforcing rib 40b has a concave edge. The cooling fins 32 and 40 basically have a cooling fin construction in accordance with the same principles as mentioned in the patent literature. The sheet structure for a vehicle-carrying internal combustion engine in the preferred embodiment of the present invention is constituted by the aforementioned structure. When the vehicle moves, the flow of air passes through the head cover 14, the cylinder head 13, the cylinder block 12, and the axle box 11 for cooling the internal combustion engine 10. The reinforcing projections 34 are formed integrally with the surface of the sheet 30 so that the reinforcing projections 34 of the cooling fins 30 are not connected to the adjacent cooling fins 30 and the reinforcing projections 34 of the adjacent cold 30. Therefore, the rigidity of the sheet 30 can be cooled by the reinforcing projections 34, and the reinforcing projections 34 can increase the surface area of the cooling fin structure to improve the cooling ability. Since the adjacent cooling fins 30 are not used by the reinforcing projections 34, the cooling fins 30 and the reinforcing projections 34 do not constitute a continuous recessed recess extending through the length of the cooling fins 30. Wall 35 is formed between adjacent ones of sheet 30. Therefore, the sand and dust particles and mud entering the space between the adjacent cooling fins 30 are less likely to accumulate in the space 32. The cylinders I 32b are provided with the cylinders which are cooled in the high outward 1 and are cooled in the cold. Made of 31 different, and cooled air, -13- 1360607 and even if sand and dust particles and mud accumulate in these spaces, it can be easily washed away with water. The reinforcing protrusions 34 with the gentle curved arcs only cause low resistance to the air flow. The reinforcing projections 34 of the adjacent cooling fins 30 are arranged in a staggered manner, so that the reduction of the cross-sectional area of the air passage formed between the adjacent cooling fins 30 by the reinforcing projections 34 can be minimized. The larger sand particles and the mud block that enter the space between the adjacent cooling fins 30 are hardly caught by the reinforcing protrusions 34, can easily roll in these spaces, and easily leave these spaces. Therefore, each air passage between adjacent cooling fins can be easily cleaned. Since these air passages are not narrowed, air can easily flow through these air passages. Since the reinforcing projections 34 on the adjacent cooling fins 30 do not overlap each other in a direction parallel to the length of the cooling fins 30, the cooling air can smoothly flow through the space between the adjacent cooling fins 30. Sand particles and mud blocks are hardly stuck in these spaces, so they can be easily cleaned. In the illustrated embodiment, the internal combustion engine 10 is suspended below the main bracket 5 that extends obliquely downward from the head tube 4 of the motorcycle to the rear, and the air intake system 20 is disposed on the main bracket 5 and the cylinder head 13 Between the spaces. Therefore, rainwater adhering to the main support 5 and the air intake system 20 during the movement of the vehicle can be easily dropped onto the cooling fin structure 31 located above the internal combustion engine 10. Rainwater and dripping onto the cooling fin structure 31 can easily flow in the direction of vehicle movement and separate from the cooling fin construction 31-14-1360607 because the cooling fins 30 and the reinforcing projections 34 are not separated. The recesses, but instead form a continuous bottom wall 35 extending along the direction of movement. In the illustrated embodiment, for example, the left end end of the cooling fins 30, that is, the outermost fins 30 on the width of the vehicle, as shown in Fig. 4, are provided with reinforcing projections on the opposite surfaces thereof. 34. The outermost cooling fin 30 may not be provided with any reinforcing protrusions 34 at all, or may not be provided with any reinforcing protrusions 34 on its outer side surface on the vehicle width; that is, at least the outermost cooling fins 30 are at least provided. The outer side surface of the vehicle width is provided with no reinforcing protrusions 34, which improves the appearance of the engine provided with the cooling fin structure 31. In the illustrated embodiment of the invention, the fin structure is formed by forming only the steam head in the cylinder to form a vapor. The shape of the fabric can also be used to make the ft& The surface of the upper and upper cylinders and the cylinder square upper cylinder are shown in the above table. [Fig. 1 is a side view of a motorcycle, which is provided with the present invention. The internal combustion engine of the preferred embodiment is constructed of a cooling fin. Figure 2 is an enlarged side elevational view of a portion of Figure 1 including the internal combustion engine and an air intake system. Fig. 3 is a side elevational view of the cylinder block provided in the internal combustion engine shown in Fig. 2. Fig. 4 is a plan view showing the cylinder block having the cooling fin structure of the present invention shown in Fig. 3. -15- 1360607 Fig. 5 is a cross-sectional view taken along line V-V of Fig. 4. Figure 6 is a top view of the cylinder block viewed from the front side along the direction of motion. Figure 7 is a plan view of the vehicle carrying the internal combustion engine. [Main component symbol description] 1 : Motorcycle 2 : Front wheel φ 3 : Front fork 4 : Head tube 5 : Main bracket 6 : Rear bracket 7 : Handle 8 : Seat 9 : Body cover 1 〇 : Internal combustion engine 1 1 : Crank Axle box 1 2 : Cylinder block 13 : Cylinder head 1 4 : Head cover 1 5 : Chain case 1 6 : Rear wheel 17 : Shock absorber 18 : Leg cover - 16-