200411112 玖、發明說明： 【發明所屬之技術領域】 本發明有關一種用於譬如安裝在 車上之強制氣冷式引擎之隔音構造。 【先前技術】 譬如，在一小輪機車型機車中 A ^ Η, ^ , 中可安裝一包括一強制氣 ~式引擎 < 擺動型引擎單元以一 缋可墙+綠 二角皮帶（Vfbelt)型連 、了 ·文式傳動器。在此型強制氣 抽的一 &…> 」巩〜式引擎中，包括一曲柄 圚婊 、 图係被一芝氣罩大致氣密地 部分中B ❺對曲柄軸外端之线罩的一 办翕蕤士人 柄軸的外端。然後，冷卻 二孔精由冷卻風扇從空氣吸入 蓋外圍。 及入以強制供應至汽缸 包括台^ ^ 丨擎中，因為冷卻風扇/ 已括心轉的正常驅動時間内由 合造成Η % ^ 、及入聲晋所造成的噪音4 曰k成問嘁，需盡力防止噪音 已締提出^ ^ 戈屬至—車輛外部。因此 匕、，，工挺出一種具有可使一空氣罩 蓋件所雩I、 二虱吸入埠被一外部| =件所覆…構造之強制氣冷式引擎(譬如請見專利 )’以及一種具有可使一空氣 又- 晋材料的覆蓋件所覆蓋之一構造了黏附-戌 見專利文件2^ 制氧冷式引擎（譬如高 [專利文件1 ] JP-B-6-29552 [專利文件2] 87606 200411112 JP-A-6-2 12995 【發明内容】 然而’在過去發證的上列公報所描述的隔音構 一 項問題在於作為聲音障壁的外部覆蓋件或覆苔件及，一 將空氣導入空氣罩内的空氣導件(百葉片)係：分 ，故使組：數增加。此外ϋ題在於為了將吸音材: 黏附至覆盍件的一内表面，故使組件數大幅增加。 已經繁於上述狀況來設計本發明’本發明：―目的係提 供可由單-組件達成冷卻空氣的導引及隔音而不 數之一種用於機車之強制氣冷式引擎之隔音構造。 解決問題的方式 如申請專利範圍第1項之發明係為一用於機車之強制氣 冷式引擎之隔音構造，其中一空氣吸入埠形成於一空氣罩 的一部分中，空氣罩形成為氣密性圍繞一包括一曲柄軸的 一外端之汽缸部，該汽缸部朝向一車輛寬度方向排列而面 對琢曲柄軸的一外端，且一冷卻風扇附接至曲柄軸的外端 ’其特徵為將一概呈碗狀的隔音覆蓋件附接至空氣吸入埠 的一車輛外側，該隔音覆蓋件具有一圍繞吸入埠的一外周 邊邵分之側周邊壁以及一阻斷側周邊壁的一車輛外側之外 侧壁’在車輛的一縱長方向延伸之概呈扁長方形的開口係 形成於外側壁中，在曲柄軸方向往上歪斜地延伸至一内側 之百葉片係形成於開口的下邊緣上，而百葉片的上邊緣定 位在一大致與開口上邊緣相同之高度。 87606 200411112 範圍 除晋 如申請專利範圍第2項之發明其特徵為在申請專利 第1項中，一朝向車輛前方開啟之流動風導入埠形成於 覆盖件的側周邊壁中。 一如申請專利範圍第3項之發明其特徵為在申請專利範圍 第2項中，當在曲柄軸方向中從車輛外側觀看時，流動^導 入埠在一體部覆蓋件中開啟，將流動風導入埠的—周邊邊200411112 (1) Description of the invention: [Technical field to which the invention belongs] The present invention relates to a soundproof structure for a forced air-cooled engine mounted on a car, for example. [Prior technology] For example, in a small-turbine model locomotive, A ^ Η, ^, can be installed with a forced air-type engine < swing type engine unit with a wall + green two-belt (Vfbelt) type even, the Wen-type actuator. In this type of forced air pumping & ... > type Gong ~ engine, including a crank 图, the picture is airtightly part of a shiba air hood B ❺ to the wire cover on the outer end of the crank shaft Xi Rui outer end of a run Scholar arbor. Then, the cooling two-hole fine is drawn into the periphery of the cover from the air by a cooling fan. In order to force the supply to the cylinder, including the engine ^ ^ 丨 engine, due to the cooling fan / the normal driving time of the heartbeat is caused by the combined Η% ^, and the noise caused by the sound of noise 4 成 成 成 嘁, Every effort must be made to prevent noise. ^ ^ Go to-outside the vehicle. Therefore, the dagger has a forced air-cooled engine (for example, see patent) with a structure that enables an air hood cover to be covered by an external | = cover ... Adhesive structure is constructed by covering one of the air-covering materials with a cover-see patent document 2 ^ Oxygen-cooled engine (such as high [Patent Document 1] JP-B-6-29552 [Patent Document 2 ] 87606 200411112 JP-A-6-2 12995 [Summary of the Invention] However, a problem with the sound insulation structure described in the above-mentioned publications issued in the past is that it is an external covering or moss covering member as a sound barrier and, once, air The air guides (louvers) introduced into the air hood are divided, so the number of groups is increased. In addition, the problem is that in order to attach the sound-absorbing material: to an inner surface of the cover, the number of components is greatly increased. Already The present invention has been devised in light of the above-mentioned circumstances. The present invention: ―The purpose is to provide a sound insulation structure of a forced air-cooled engine for a locomotive, which can achieve cooling air guidance and sound insulation by a single component. If the scope of patent application item 1 Ming is a sound-proof structure of a forced air-cooled engine for a locomotive. An air intake port is formed in a part of an air hood, which is formed as a gas tightly surrounding a cylinder including an outer end of a crank shaft. The cylinder portion is aligned toward a vehicle width direction and faces an outer end of the crankshaft, and a cooling fan is attached to the outer end of the crankshaft, which is characterized by attaching a generally bowl-shaped soundproof cover to the outside air intake port of a vehicle, the sound insulation cover having 'extending in a longitudinal direction of the vehicle around an outer periphery of a side wall outside of the outer side peripheral wall Shao per vehicle and a side peripheral wall of the block a suction port of takes Chengbian rectangular opening system formed in the outer side wall, extending upward skew to an inner blade of one hundred lines formed on the lower edge of the opening in the direction of the crankshaft, and the upper edge of the louver is positioned at a substantially opening The upper edge has the same height. 87606 200411112 Except for the second invention in the scope of the patent application, the feature is that in the first patent application, a flowing wind opened towards the front of the vehicle The entry port is formed in the side peripheral wall of the cover. As in the invention in the scope of patent application No. 3, it is characterized in that in the patent application scope No. 2, when viewed from the outside of the vehicle in the direction of the crank shaft, the flow is introduced into the port open the cover portion integrally, the wind introduction port of the flow - the peripheral edge
緣形成為平行於體部覆蓋件的一後邊緣。 I 斤如申請專·圍第4項之發明其特徵為纟_請專利範圍 第2或3項中，體部框架定位於隔音覆蓋件的流動風導入 之前方。 本發明的作用及優點 一根據申請專利範圍第巧之本發明之隔音構造，隔音構覆 盖件附接至芝氣罩的吸入璋外側，在車輛縱長方向延伸之 長万=開口形成於隔音覆蓋件的外側壁上，在曲柄轴方向 j上正斜地延伸的百葉片係形成於開口的下邊、緣上。因此 々部以沿著百葉片自開口吸人空氣罩内，且冷卻空氣 可平順地送到—、、与& @ ^ /飞缸奴。另一方面，因為冷卻風扇的吸入 噪音或類似物所谇士、 „、 成足Ρ呆骨係在隔音覆蓋件外側壁上碰撞 到内表面之後沿英I # 、 f百茱片任下排放至車輛外部，噪音可朝 向從騎士消散噪立、 木㈢ < 万向排放且可使其降低。結果，可藉 由一個隔音覆芸杜士 ， 夏識件采達成冷卻空氣的導引及噪音的降低而The edge is formed parallel to a rear edge of the body cover. The application of the invention described in item 4 is characterized by the following features: In the item 2 or 3, the body frame is positioned in front of the flowing wind of the soundproof cover. The function and advantages of the present invention: According to the sound insulation structure of the present invention, the sound insulation structure cover is attached to the outside of the suction ridge of the hood, and the length extending in the longitudinal direction of the vehicle = the opening is formed in the sound insulation cover. On the outer side wall of the piece, a louver system that extends obliquely in the crank axis direction j is formed on the lower side and edge of the opening. Therefore, the crotch sucks into the air hood from the opening along the louvers, and the cooling air can be smoothly sent to — ,, and & @ ^ / 飞 罐 奴. On the other hand, due to the suction noise of the cooling fan or the like, the "stomach foot" bone system is discharged on the outer side wall of the sound insulation cover and hits the inner surface of the I #, f. Outside the vehicle, the noise can be dissipated from the knight to stand up, and the wooden clogs can be reduced and reduced. As a result, a sound-proof cover can be used to guide the cooling air and reduce noise. lowering
不增加元件數，B 不4要吸音材料，因此可控制成本的增 高0 此外，本發明中 因為百葉片的上邊緣定位在大致與開 87606 200411112 口上邊緣相同之高度，開口可大致被百葉片所覆蓋，且決 不會從車輛的上方與側邊位置看見隔音覆蓋件中的冷卻風 扇，因此可在開口形成於隔音覆蓋件外側壁上之案例中控 制了對於外觀的破壞作用。 如申請專利範圍第2項之發明中，因為朝向車輛前方開啟 之流動風導入埠形成於隔音覆蓋件的側周邊壁上，冷卻水 在移行期間會連同來自外側壁的開口之冷卻空氣一起導入 空氣罩内，因此可改善引擎的冷卻效率。此外，因為來自 流動風導入埠的風扇噪音傾向於被自流動風導入埠所吸入 的流動風加以吸收，可使噪音降低。 u甲知專利範圍第3項之發明中，因為流動風導入埠在触 邵覆蓋件中為開啟且流動料人埠的料邊㈣成為平= 於體部覆蓋件的後邊緣，決不會從車輛側邊看見流動風導 因此可防止破壞外觀。此外，目為風扇噪音從流動 ::入埠排入體部覆蓋件中’難以在外部聽見風扇嗓音， 外部。 了防止流動風的吸入聲音洩漏至 如申請專利範圍第4項之發明中， 毹rr # Τ因為體邵框架定位在流 動風導入璋的前方，不需 、、云叙！^ Μ . 、特疋遮敝件即可防止異物從 机動風導入埠進入隔音覆蓋件中。 【實施方式】 發明實行模式 第1至8圖說明根據本發日月的—實施例 下文參照圖式描述本發明的實施例Without increasing the number of components, B does not require sound-absorbing materials, so the increase in cost can be controlled. In addition, in the present invention, because the upper edge of the louver is positioned at approximately the same height as the upper edge of the opening 87606 200411112, the opening can be roughly covered by the louver. Covering, and the cooling fan in the soundproof cover is never seen from above and from the side of the vehicle, so the damage to the appearance can be controlled in the case where the opening is formed on the outer side wall of the soundproof cover. As in the invention in the second scope of the patent application, because the flowing air introduction port opened toward the front of the vehicle is formed on the side peripheral wall of the sound insulation cover, the cooling water is introduced into the air along with the cooling air from the opening of the outer side wall during the movement. Inside the hood, thus improving the cooling efficiency of the engine. In addition, since the fan noise from the mobile wind inlet port tends to be absorbed by the mobile wind drawn from the mobile wind inlet port, the noise can be reduced. In the invention of item 3 of the Jiazhi patent scope, because the mobile wind inlet port is open in the contact cover and the material edge of the mobile material port becomes flat = at the rear edge of the body cover, it will never vehicle air guide side flow can be prevented saw damage appearance. In addition, it is intended that the fan noise is discharged from the flowing :: in port into the body cover 'and it is difficult to hear the fan voice from the outside, the outside. In order to prevent the inhalation sound of the flowing wind from leaking to the invention in the fourth scope of the patent application, 毹 rr # Τ because the body frame is positioned in front of the introduction of the moving wind, there is no need. ^ Μ., Special shields can prevent foreign objects from entering the sound insulation cover from the motorized wind introduction port. [Embodiment] Invention implementation mode Figures 1 to 8 illustrate the embodiment according to the date and month of the present invention-the embodiment of the invention is described below with reference to the drawings
強制氣冷式弓I 87606 200411112 擎之一隔音構造。圖丨為—安鈿 女裝有強制氣冷式引擎之小輪機 車型機車之側視圖，圖2為弥人 、、’鉍制乱冷式引擎之剖視圖，圖3 、圖4及圖5分別顯示一隔音雩苫、 χ 曰覆農件的安裝狀態之側視圖、 後視圖及仰視圖，圖6為隔音考言 、 θ田曰覆盍件的側視圖，圖7及圖8為 隔晋覆蓋件的剖視圖（沿英i ^ ^Forced air-cooled bow I 87606 200411112 One of the sound insulation structure. Figure 丨 is a side view of a small locomotive with a forced air-cooled engine for women's wear. Figure 2 is a cross-sectional view of the Miren, and bismuth chaos engine. Figures 3, 4 and 5 show a Side view, rear view, and bottom view of the installation state of sound insulation 曰, χ: agricultural cover, Fig. 6 is a side view of sound insulation text, θ Tian, cover, and Fig. 7 and 8 are partitions of Jin cover Sectional view (along English i ^ ^
(耆罘6圖的線VII-VII及線VIII-VIII 所取之剖視圖）。 圖中，編号虎1代表一小輪機車型機4，在其示意性代表的 種構k中，一前又3藉由_頭管（未圖示）可樞轉式支撐至 一底骨（underbone)型體部框架2的一前端上之左與右方，一 幻輪4配置於兩叉3的一下端上，一轉向操縱桿$配置於其一 下吻上，一座椅6配置於體部框架2縱長方向的一中央部分 中，一擺動型引擎單凡7配置於座椅6底下而能夠垂直地擺 動，且一後輪8配置於引擎單元7的一後端上。 體邵框架2的前叉3之一前側係被一前覆蓋件9所圍繞，而 其一後側被一腳遮蔽件10所圍繞，且轉向操縱桿5被一操縱 覆蓋件11所圍繞。此外，一可供擺放騎士足部的足板12係配 置於腳遮蔽件1 0的一下端上，而座椅6的一下部被左及右側 覆蓋件13所圍繞。 側覆蓋件1 3係分成用於覆蓋住足板丨2的一下側之底覆蓋 件14及用於覆蓋住座椅6的下部分之上覆蓋件1 5。側覆蓋件 13的後邊緣13a從上覆蓋件14後端歪斜地升高至側覆蓋件13 下邊緣之縱長方向的中央部分。 ： 引擎單元7具有一種使三角皮帶型連續可變傳動器21在 一強制氣冷式引擎20的一車輛寬度方向中整體式耦合至一 87606 -10- 200411112 左側部分之構造。 此強制氣冷式?1擎20係為一種二行程單汽缸型引擎且具 有種使&含一體成型的多個冷卻片24a之汽缸體24輕合 土各有在車輛寬度方向中水平地排列的曲柄軸22之曲柄 軸箱23且使一汽缸蓋25耦合至汽缸體24的一前側對接表面 足構造。將一經由一連接桿26耦合至曲柄軸U之活塞”可 滑式插入且排列方、、与左丫 #曲q 1 J在，飞缸胆24中，且將一點火塞28插入汽缸 蓋25中。 一排氣埠（未圖示）在汽缸體24的一下表面壁中開啟，且一 排氣官29連接至排氣埠。此排氣管“從汽缸體以經由一曲 柄軸相30的一下側在曲柄軸方向中延伸至右側且從右側端 車輛的後方向中延伸，而一配置於後輪8右側之消音器 29a連接至後端。 一延伸至車輛後方之變速箱3〇係一體成型在曲柄軸箱23 义曲柄軸方向的左側部分，且一箱覆蓋件31以螺栓固定至 又速相30的車輛外側。三角皮帶型連續可變傳動器2丨係容 納在變速箱30及箱覆蓋件31形成之一皮帶室中。 #J用種使一二角皮帶3 6捲繞在一驅動滑輪3 3及一從動 π輪35周圍且其中驅動滑輪33附接至曲柄軸22的一左側端 而彳文動滑輪3 5附接至一在變速箱3〇的一後端與曲柄軸22平 行配置之傳動軸3 4並且使一離心離合器3 7附接至傳動軸3 4 上之從動滑輪3 5的一外側之構造，藉以形成此連續可變傳 動哭ο 1 〇口〜1 〇此夕卜，一藉由一減速機構4〇的干預作用而使後輪8 點附於其上之後輪驅動軸4 1係與傳動軸34後的曲柄軸22呈 87606 200411112 千订配置。並且’曲柄抽22的旋轉係自驅動滑輪33固定地 傳輸至從動滑輪35’且當曲柄軸22的旋轉增加時，從動滑 輪35的旋轉係經由離心離合器37傳輸至傳動軸34且經由減 速機構40從傳動軸34傳輸至後輪驅動軸4ι。 接著，描述上列強制氣冷式引擎2〇的隔音構造。 一氣密性圍繞汽缸體24及汽缸蓋25之空氣罩45係附接 且固定至從曲柄軸22的一右側端（包括右側端）延伸至汽缸 體24及汽缸蓋25之一部分。一冷卻空氣吸入埠45a形成於 在曲柄軸方向中面對右側端之此空氣罩45的一部分中，且 一冷卻空氣埠45b形成於面對冷卻片24a之汽缸體以的一 部分中。 一發電機47安裝在曲柄軸22的右側端上以與曲柄軸22 一 起從轉，且一冷卻風扇46形成於發電機47的一外表面上。 & ~卻風扇46依照曲柄軸22的旋轉而轉動時，冷卻空氣從 冷钟空氣吸入埠45a吸入，且此冷卻空氣在冷卻汽缸體24及 汽缸盍25時係於空氣罩45内側流動並從排放埠45b排放至 外側（請見圖2的箭頭）。 一隔晋覆盍件50在空氣罩45的冷卻空氣吸入埠45a之曲柄 軸方向中配置於車輛外側上。此隔音覆蓋件5〇係為藉由一 形成為氣笟性圍繞冷卻空氣吸入埠4 5 a的一外周邊部分之側 周邊壁50a與一用於阻斷側周邊壁5〇a的車輛外側之蓋狀外 側壁5 Ob —體成型所構成之一種大致碗狀的覆蓋件。凸緣段 50c形成於側周邊壁5〇a的一開口邊緣上。這些凸緣段5〇c& 藉由一固定螺絲5 1緊扣及固定至空氣罩45的一轂段45d。 87606 200411112 一用於避免與排氣管29產生干涉之平坦段5〇〇1係形成於 隔音覆蓋件50的側周邊壁50a之一下表面上。因此， J防止 隔晋覆蓋件50因為來自排氣管29的熱量而過熱。 一朝向車輛前方開啟之流動風導入埠50e係形成於隔音覆 蓋件50的側周邊壁50a上。此流動風導入埠50e呈傾斜以相對 於一垂直線界定一約25度的角度並且開啟進入側覆蓋件u 内。此外，當從車輛側邊觀看時，流動風導入埠5 〇 e的—門 邊邵分係平行於側覆蓋件13的後邊緣1 3 a。 此外，體部框架2的一座椅軌段2a排列在流動風導入埠5〇e 的前邵。此處，雖然未圖示，體部框架2主要係包括一在後 下方向中從頭管延伸之底管段，一從底管段的一後端在後 方向中大致水平地延伸之足倚靠段，及從足倚靠段的一後 端往上歪斜地延伸之座椅軌段2a。 四個在車輛縱長方向延伸之開口 52、53係平行地形成於 隔音覆蓋件50的外側壁501)上之垂直方向中。其中的上方三 個開口 52形成為概呈扁長方形，且最下端的開口 53形成為 概呈圓弧形。 曲柄軸方向中往上歪斜地延伸至内側亦即進入隔音覆蓋 件50内I百葉片54係一體成型在各別長方形開口 52的下邊 緣52a上。各別百葉片54的傾斜角一般設定為5〇至6〇度。並 且，各別百葉片54的上邊緣54a係設定在一與長方形開口 52 的上邊緣52b具有相同高度之位置中。因此，從車輛外的上 方及側邊位置觀看時，各別的長方形開口 52被百葉片54所 阻斷。 87606 -13- 200411112 此外，在圓弧形開口 53的一下邊緣53a上，形成了 一從下 邊緣53a在往後方向延伸之後朝上垂直延伸之百葉片55，且 百葉片55的一上邊緣55a係定位在與圓弧形開口 53的上邊緣 53b相同之高度。 接著，描述此實施例的作用及優點。 在引擎驅動期間，冷卻風扇46依照曲柄軸22的旋轉而轉 動，且在怠性驅動時，冷卻風扇主要從隔音覆蓋件50的各 別開口 52、53吸入。另一方面，冷卻風扇46的吸入聲音係 碰撞百葉片54内表面及外側壁5〇b内表面並從長方形52開 口沿著隔音覆蓋件50下側的百葉片54外表面往下排放至車 輛外部。 在行進時隨著曲柄軸22的旋轉增快，冷卻風扇46的旋轉 將增快’因此從隔音覆蓋件5 〇的各別開口 5 2、5 3吸入冷卻 空氣’在此同時，自流動風導入埠5〇e吸入流動的風。在此 例中，藉由從導入埠50e吸入的冷卻空氣在隔音覆蓋件5〇中 抑止住>jfL動風導入埠5 〇 e的噪音，且可控制排放至外部的噪 音。 利用此方式，根據此實施例的隔音構造，具有側周邊壁 50a及外側壁5〇b之碗狀隔音覆蓋件5〇係附接至空氣罩“的 冷卻空氣吸入埠45a之車輛外側，在車輛縱長方向延伸的扁 長方形開口 52係形成於隔音覆蓋件5〇的外側壁5扑上，往上 歪斜地延伸至隔音覆蓋件50内之百葉片54係一體成型在各 別扁長方形開口 52的下邊緣52a上。因此，冷卻空氣從各別 開口 52沿著百葉片54導入隔音覆蓋件5〇内、經由空氣罩c 87606 14 200411112 供應至汽缸蓋24的冷卻片24a、且在進行熱交換之後從排放 埠45b排放至外部。 另一方面，諸如冷卻風扇46及引擎產生的吸入聲音等噪 音係碰撞百葉片54内表面及隔音覆蓋件50的外側壁50b且 隨後從開口 52沿著各別百葉片54往下排放至車輛外部，因 此嗓首可以排向自騎士後退構成距離之地面且可顯著地降 低11呆晋。結果，可藉由單一隔音覆蓋件5〇來達成冷卻空氣 的導引及噪音的降低而不增加組件數，且相較於安裝兩個 組件之習知案例可以使成本降低。 此外’因為各別百葉片54的上邊緣54a係定位在大致與長 方形開口 52的上邊緣52b相同之高度，開口 52可大致被百葉 片5 4所覆盖，決不會從車輛上方及側邊位置看見隔音覆蓋 件50中的冷卻風扇46，因此可防止因為形成開口 52而破壞 外觀。 此實施例中，因為開啟進入車輛前方之流動風導入埠 係形成於隔音覆蓋件50的側周邊壁50a中，冷卻空氣在行進 期間會連同來自外側壁5〇b的各別開口 52之冷卻空氣一起 導入空氣罩45内，故可改善引擎20的冷卻效率。 此外’可藉由從導入埠50e吸入之流動的風在隔音覆蓋件 50中抑止來自流動風導入埠5〇e之風扇噪音或類似物，故可 改善降低噪音之效果。 此實施例中，因為流動風導入埠50e的周邊邊緣形成為平 行矣側覆蓋件1 3的後邊緣1 3 a，且流動風導入埠5 〇e亦開啟進 入側覆蓋件13中，決不會從車輛側邊看見流動風導入埠5〇e 87606 -15 - 200411112 ’因此可防止破壞外觀，且可防止流動的風之吸 漏至外部。 & 此實施π中’、因為體部框架2的座椅軌段2a排列在流動風 门阜5Ge的則万’不提供特定遮蔽件即可防止異物從流動 風導入埠5〇e進入隔音覆蓋件5〇。 【圖式簡單說明】 :4 *衣有一根據本發明的一實施例之強制氣冷式 引擎之小輪機車型機車； 圖2為強制氣冷式引擎之剖視圖； ㈤V為女衣在強制氣冷式引擎上之-隔音覆蓋件的側視 圖4為隔音覆蓋件的安裝狀態之後視圖； mi < ^ ^ ^ 一 一 1 圖5為顯示隔音覆苫侏 復義件的女裝狀態之仰視圖； 圖6為隔音覆蓋件之側視圖； 圖7為卩南音覆蓋件 、 ;、目固 勺剖視圖（沿著圖6的線VII-VII所取的 舌1J視圖）； 圖8為隔音覆苫侔μ、t、 Μ視圖）· 现勺刮視圖（沿著圖6的線VIII-VIII所取的 【圖式代表符號說明】 1 小輪機車型機車 2 體部框架 2a 座椅軌段 - 3 前又 4 前輪 87606 -16- 200411112 5 轉向操縱桿 6 座椅 7 擺動型引擎單元 8 後輪 9 前覆蓋件 10 腳遮蔽件 12 足板 13 側覆蓋件（體部覆蓋件） 13a 後邊緣 14 底覆蓋件 15 上覆蓋件 20 強制氣冷式引擎 21 三角皮帶型連續可變傳動器 22 曲柄軸 23 曲柄軸箱 24 汽缸體 24a 冷卻片 25 汽缸蓋 26 連接桿 27 活塞 28 點火塞 29a 消音器 29 排氣管 30 變速箱 87606 -17- 200411112 31 箱覆蓋件 33 驅動滑輪 34 傳動軸 35 從動滑輪 36 三角皮帶 40 減速機構 41 後輪驅動軸 45 空氣罩 45a 冷卻空氣吸入埠 45d 轂段 46 冷卻風扇 47 發電機 50 隔音覆蓋件 50a 側周邊壁 50b 外側壁 50c 凸緣段 50d 平坦段 50e 流動風導入埠 51 固定螺絲 52, 53 開口 52a，53a 下邊緣 52b， 53b， 上邊緣 54a, 55a 54, 55 百葉片 -18 87606(Section VII-VII and VIII-VIII in Figure 6). The Figure, numeral 1 represents a tiger small turbine models machine 4, in which k conformers schematically represented, and a front head pipe 3 by _ (not shown) may be pivoted support to a bottom bone ( left and right on one front end of the underbone type body frame 2, a magic wheel 4 is disposed on the lower end of the two forks 3, a steering joystick $ is disposed on the lower kiss, and a seat 6 is disposed on the body a central portion of the frame portion 2 in the longitudinal direction, where a single swing type engine 6 disposed below the seat 7 and can be vertically swung, a rear end 7 and the rear wheel 8 is disposed in a engine unit. A front side of one of the front forks 3 of the body frame 2 is surrounded by a front cover 9, and a rear side thereof is surrounded by a foot cover 10, and the steering lever 5 is surrounded by a steering cover 11. In addition, a foot plate 12 on which the foot of the knight can be placed is arranged on the lower end of the foot covering member 10, and the lower portion of the seat 6 is surrounded by left and right covering members 13. The side covers 1 3 are divided into a bottom cover 14 for covering the lower side of the foot plate 2 and a cover 15 for covering the lower part of the seat 6. The rear edge 13a of the side cover 13 is obliquely raised from the rear end of the upper cover 14 to the central portion in the longitudinal direction of the lower edge of the side cover 13. : The engine unit 7 has a structure in which a V-belt type continuously variable transmission 21 is integrally coupled to a left portion of an 87606 -10- 200411112 in a vehicle width direction of a forced air-cooled engine 20. ? This forced air cooling engine 20 based Formula 1 as a two-stroke single-cylinder engine and having a kind of so & containing a plurality of cooling fins 24a integrally formed cylinder body 24 of each light combined soil arranged horizontally in the vehicle width direction the crankshaft 22 of the crankcase 23 and a cylinder head so that a front abutment surface 25 configured to be coupled to the foot 24 of the cylinder block. A piston that is coupled to the crankshaft U via a connecting rod 26 is slidably inserted and arranged squarely with the left side # 曲 q 1 J in the cylinder cylinder 24 and an ignition plug 28 is inserted into the cylinder head 25 An exhaust port (not shown) is opened in the lower surface wall of the cylinder block 24, and an exhaust port 29 is connected to the exhaust port. This exhaust pipe "is routed from the cylinder block through a crankshaft phase 30 in the side extending in the direction of the crankshaft to the right direction and extending from the rear end of the right side of the vehicle, and a rear wheel 8 disposed in a muffler connected to the rear end 29a of the right side. A gearbox 30 extending to the rear of the vehicle is integrally formed on the left side of the crankshaft box 23 in the direction of the crankshaft, and a box cover 31 is bolted to the outside of the vehicle 30 in the speed phase 30. The V-belt type continuously variable actuator 2 is housed in a belt chamber formed by the gearbox 30 and the case cover 31. #J is used to make a two-corner belt 3 6 wound around a driving pulley 3 3 and a driven π wheel 35 with the driving pulley 33 attached to a left end of the crank shaft 22 and the dynamo moving pulley 3 5 attached A structure to an outer side of a transmission shaft 34 arranged parallel to the crank shaft 22 at a rear end of the gearbox 30 and attaching a centrifugal clutch 37 to a driven pulley 35 on the transmission shaft 3 4 is formed. This continuously variable transmission ο 1 〇 mouth ~ 1 〇 At this point, by the intervention of a reduction mechanism 40, the rear wheel 8 points attached to the rear wheel drive shaft 4 1 and the drive shaft 34 rear The crankshaft 22 is in a configuration of 87606 200411112 thousand. And 'a crank 22 is evacuated from the rotating frame 33 is fixed to the drive pulley to the driven pulley transmission 35' and increases when the rotation of the crank shaft 22, the driven pulley 40 via the rotating frame 35 is transmitted to the centrifugal clutch 37 and the drive shaft 34 via a speed reduction mechanism 4ι shaft 34 from the drive shaft to the rear wheel transmission. Next, the above forced air-cooled engine soundproof structure of 2〇. An air hood 45 surrounding the cylinder block 24 and the cylinder head 25 is attached and fixed to a portion extending from a right end (including the right end) of the crank shaft 22 to the cylinder block 24 and the cylinder head 25. A cooling air intake port 45a is formed in a part of the air hood 45 facing the right end in the crank axis direction, and a cooling air port 45b is formed in a part facing the cylinder block of the cooling fin 24a. A generator 47 is mounted on the right end of the crank shaft 22 to rotate together with the crank shaft 22, and a cooling fan 46 is formed on an outer surface of the generator 47. & ~ When the fan 46 rotates in accordance with the rotation of the crankshaft 22, the cooling air is drawn in from the cold bell air suction port 45a, and this cooling air flows inside the air cover 45 when cooling the cylinder block 24 and the cylinder 盍 25, and flows from discharged to the outside of the discharge port 45b (see Figure 2, arrow). A cover member 50 is arranged on the outside of the vehicle in the crank axis direction of the cooling air intake port 45a of the air hood 45. The sound insulation cover 50 is formed by a lateral peripheral wall 50a of an outer peripheral portion surrounding the cooling air suction port 4 5 a air-definingly and a vehicle outer side for blocking the lateral peripheral wall 50 a. The cover-shaped outer wall 5 Ob is a substantially bowl-shaped covering member formed by a body molding. The flange section 50c is formed on an opening edge of the side peripheral wall 50a. These flange sections 50c & are fastened and fixed to a hub section 45d of the air hood 45 by a set screw 51. 87606 200411112 A flat section 501 for avoiding interference with the exhaust pipe 29 is formed on the lower surface of one of the side peripheral walls 50a of the sound insulation cover 50. Therefore, J prevents the partition cover 50 from overheating due to the heat from the exhaust pipe 29. A flowing air introduction port 50e opened toward the front of the vehicle is formed on a side peripheral wall 50a of the soundproof cover member 50. The flowing wind introduction port 50e is inclined to define an angle of about 25 degrees with respect to a vertical line and opens into the side cover u. In addition, when viewed from the side of the vehicle, the door-side edge of the flowing wind introduction port 50 e is parallel to the rear edge 1 3 a of the side cover 13. In addition, a seat rail section 2a of the body frame 2 is arranged in front of the flowing air introduction port 50e. Here, although not shown, the body frame 2 mainly includes a bottom tube section of the tube extending from the head in a rear lower direction, in the direction of extending substantially horizontally from a rear end of a bottom tube section against foot section, and the seat rail section extending upward from a rear skewed against foot section 2a. Four openings 52, 53 extending in the longitudinal direction of the vehicle are formed in the vertical direction on the outer side wall 501) of the sound insulation cover 50 in parallel. The upper three openings 52 are formed into a substantially rectangular shape, and the lowermost opening 53 is formed into a substantially circular arc shape. The louvers 54 extending diagonally upward to the inside in the crank axis direction, that is, into the soundproof cover 50, are integrally formed on the lower edges 52a of the respective rectangular openings 52. The inclination angle of each louver 54 is generally set to 50 to 60 degrees. Moreover, the upper edge 54a of each louver 54 is set in a position having the same height as the upper edge 52b of the rectangular opening 52. Therefore, when viewed from above and outside the vehicle, the respective rectangular openings 52 are blocked by the louvers 54. 87606 -13- 200411112 In addition, on the lower edge 53a of the arc-shaped opening 53, a louver 55 extending vertically from the lower edge 53a in a backward direction is formed, and an upper edge 55a of the louver 55 It is positioned at the same height as the upper edge 53 b of the arc-shaped opening 53. Next, the functions and advantages of this embodiment will be described. During engine driving, the cooling fan 46 rotates in accordance with the rotation of the crankshaft 22, and during idle driving, the cooling fan is mainly sucked through the respective openings 52, 53 of the soundproof cover 50. On the other hand, the suction sound of the cooling fan 46 collides with the inner surface of the louver 54 and the inner surface of the outer side wall 50b, and is opened from the rectangle 52 along the outer surface of the louver 54 on the lower side of the sound insulation cover 50 to the outside of the vehicle. . As the crankshaft 22 rotates faster during travel, the rotation of the cooling fan 46 will increase 'so the cooling air is drawn in from the respective openings 5 2, 5 3 of the soundproof cover 50' and at the same time, the self-flowing wind is introduced Port 50e draws in flowing wind. In this example, the cooling air sucked from the introduction port 50e suppresses the noise of the> jfL moving wind introduction port 50e in the sound insulation cover 50, and the noise emitted to the outside can be controlled. In this way, according to the sound insulation structure of this embodiment, the bowl-shaped sound insulation cover 50 having the side peripheral wall 50a and the outer side wall 50b is the outside of the vehicle attached to the cooling air intake port 45a of the air hood. The flat rectangular openings 52 extending in the longitudinal direction are formed on the outer side wall 5 of the sound insulation cover 50, and the louvers 54 extending diagonally into the sound insulation cover 50 are integrally formed in the respective flat rectangular openings 52. The lower edge 52a. Therefore, cooling air is introduced from the respective openings 52 along the louvers 54 into the soundproof cover 50, is supplied to the cooling fins 24a of the cylinder head 24 via the air cover c 87606 14 200411112, and is subjected to heat exchange It is discharged to the outside from the discharge port 45b. On the other hand, noise such as the suction sound generated by the cooling fan 46 and the engine hits the inner surface of the louver 54 and the outer side wall 50b of the soundproof cover 50 and then follows the openings 52 along the respective hundred The blades 54 are discharged downward to the outside of the vehicle, so the voice can be discharged to the ground that is a distance away from the knight and can be significantly reduced by 11. The result is that a single sound insulation cover 50 can be used. The cooling air guidance and noise reduction can be achieved without increasing the number of components, and the cost can be reduced compared to the conventional case of installing two components. In addition, 'because the upper edges 54a of the respective louvers 54 are positioned approximately at the same level as The upper edge 52b of the rectangular opening 52 is the same height. The opening 52 can be covered by the louvers 54. The cooling fan 46 in the soundproof cover 50 can never be seen from above and from the side of the vehicle. 52 and the appearance is damaged. In this embodiment, because the opening for the flow of wind introduced into the front of the vehicle is formed in the side peripheral wall 50a of the sound insulation cover 50, the cooling air will travel along with the The cooling air of the opening 52 is introduced into the air hood 45 together, so that the cooling efficiency of the engine 20 can be improved. In addition, the sound from the flowing wind inlet port 50e can be suppressed in the soundproof cover 50 by the flowing wind sucked from the inlet port 50e. The fan noise or the like can improve the noise reduction effect. In this embodiment, the peripheral edge of the flowing air introduction port 50e is formed to cover the side of the parallel side. The rear edge 1 3 a of the piece 13 and the flowing wind introduction port 50 oe are also opened into the side cover 13, and the flowing wind introduction port 50e will never be seen from the side of the vehicle. 87606 -15-200411112 Prevents the appearance from being damaged, and prevents the leakage of the flowing wind to the outside. &Amp; In this implementation, 'since the seat rail segments 2a of the body frame 2 are arranged on the flowing damper 5Ge, no specific shielding is provided. It can prevent foreign matter from entering the soundproof cover 50 from the flowing wind introduction port 50e. [Simplified illustration of the drawing]: 4 * A small-wheel model locomotive with a forced air-cooled engine according to an embodiment of the present invention; Figure 2 is a sectional view of a forced air-cooled engine; ㈤V is a side view of a woman's clothing on a forced air-cooled engine-a soundproof cover 4 is a rear view of the installed state of the soundproof cover; mi < ^ ^ ^ 1-11 Fig. 5 is a bottom view showing the state of the women's clothing of the sound-insulated overlying compound; Fig. 6 is a side view of the sound-insulating cover; Fig. 7 is a cross-sectional view of the Nanan sound cover; 1J view of the tongue taken from VII-VII); Figure 8 is the sound insulation cover μ, t View of Μ) · View of current scoop (description of representative symbols taken along line VIII-VIII in Fig. 6) 1 Locomotive model 2 Locomotive frame 2a Seat rail section-3 front and 4 front wheels 87606- 16- 200411112 5 Steering lever 6 Seat 7 Swing type engine unit 8 Rear wheel 9 Front cover 10 Foot cover 12 Foot plate 13 Side cover (body cover) 13a Rear edge 14 Bottom cover 15 Upper cover 20 Forced air-cooled engine 21 V-belt type continuously variable actuator 22 Crankshaft 23 Crankshaft box 24 Cylinder block 24a Cooling fins 25 Cylinder head 26 Connecting rod 27 Piston 28 Ignition plug 29a Muffler 29 Exhaust pipe 30 Transmission 87606 -17- 200411112 31 Box cover 33 Drive pulley 34 Drive shaft 35 Driven pulley 36 V-belt 40 Reduction mechanism 41 Rear wheel drive shaft 45 Air hood 45a Cooling air intake port 45d Hub section 46 Cooling fan 47 Generator 50 Sound insulation cover 50a Side peripheral wall 50b Outer side wall 50c Flange section 50d Flat section 50e Flow air inlet port 51 Fixing screw 52, 53 Opening 52a, 53a Lower edge 52 b, 53b, upper edge 54a, 55a 54, 55 louver -18 87606