200925399 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種引擎及一種跨坐型車輛。 【先前技術】 在已知之技術中’一機車等之一引擎係具有一偵測一曲 柄軸之旋轉角度的曲柄角度感測器。所偵測之旋轉角度係 用於該引擎之一點火時刻控制及一燃油噴射控制。該曲柄 角度感測器係附接至（例如）一從該曲柄轴箱延伸的附接部 〇 分’並面朝一與該曲柄軸共同旋轉的構件，例如一發電機 之一轉子。 【發明内容】 然而，當該曲柄角度感測器係附接至從該曲柄軸箱延伸 的該附接部分，該附接部分需沿著該曲柄轴延伸一相對較 長的距離。結果，該曲柄角度感測器由於接收該車輛車體 之震動而易於擺動。 ❹此外，曰本專利第2649527號揭示一種曲柄角度感測器 附接至一用於覆蓋引擎之蓋子的技術。然而，同樣地在此 清況中，該曲柄角度感測器由於該蓋子的震動而易於擺 動。 、 β本發明係鑒於上述情況而予以設計，本發明之一目的係 提供一種能夠減彡一曲柄角度感測器之擺動的引擎及跨坐 型車輛》 含為解決上述問題，根據本發明之―弓丨擎其特徵在於包 支撐曲柄軸的曲柄轴箱；一在一所決定之偵測位 133275.doc 200925399 置偵測該曲柄轴之一旋轉角度的曲柄角度感測器；及一具 有一插入孔之構件，該曲柄軸可插入該插入孔，且該構件 係提供於-比該曲柄轴箱更接近該偵測位置的側面。該曲 柄角度感測器係附接至一形成於該構件中的附接部分。 根據本發明’該曲柄角度感測器所附接的該附接部分係 形成於該構件中’該構件健供於—比該曲柄輛箱更接近 該债測位置的該側面。因此，相較於該附接部分自該曲柄 軸箱延伸的情況，該附接部分可製作地更短。因此，該曲 柄角度感測器之擺動可予以減少。 此外，根據本發明之一態樣，該構件為一油泵蓋，用於 封閉一形成於該曲柄轴箱中的油泵外殼。此配置允許該油 泵蓋亦作為該上述構件而使用。 在此態樣中，相對於該曲柄軸，一置於該油泵外殼中的 油泵及形成於該油泵蓋中的該附接部分係定位於相同的側 面。使用此配置，因為該附接部分錢位於與該油果相同 的侧面，覆蓋該油泵的該油泵蓋不需要被製作地過大。 此外，根據本發明之一態樣，該構件之該插入孔係提供 在一遠離一中間部分的位置。此配置易於確保一用於形成 該附接部分的空間。 另外，根據本發明之一態樣，該構件具有一盤形並包含 在一偏移於一中間部分之位置的該插入孔。此配置易於確 保一用於形成該附接部分的空間。 在這些態樣中，相對於該中間部分，該附接部分可定位 於該插入孔的一相對側。此配置易於確保一提供於該曲柄 133275.doc 200925399 軸及該附接部分之間的空間。 此外，根據本發明之一態樣，進一步提供一與該曲柄轴 一起旋轉的風扇。該附接部分係形成於遠離一流道的一位 置’一藉由該風扇之旋轉產生的氣流經由該流道從該曲柄 轴箱之一侧面流到一汽缸之一側面。此配置可防止從該曲 柄轴側流向該汽缸側的該氣流被該附接部分及該曲柄角声 感測器阻塞。200925399 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to an engine and a straddle type vehicle. [Prior Art] In the known art, an engine of a locomotive or the like has a crank angle sensor that detects a rotation angle of a crankshaft. The detected rotation angle is used for one of the engine's ignition timing control and one fuel injection control. The crank angle sensor is attached to, for example, an attachment portion ’' extending from the crankcase and facing a member that rotates with the crankshaft, such as a rotor of a generator. SUMMARY OF THE INVENTION However, when the crank angle sensor is attached to the attachment portion extending from the crankcase, the attachment portion needs to extend a relatively long distance along the crankshaft. As a result, the crank angle sensor is easily swung by receiving the vibration of the vehicle body. In addition, Japanese Patent No. 2649527 discloses a technique in which a crank angle sensor is attached to a cover for covering an engine. However, also in this condition, the crank angle sensor is easy to swing due to the vibration of the cover. The present invention is designed in view of the above circumstances, and an object of the present invention is to provide an engine and a straddle type vehicle capable of reducing the swing of a crank angle sensor, in order to solve the above problems, according to the present invention - The bow engine is characterized by a crankcase that supports the crankshaft; a crank angle sensor that detects a rotation angle of the crankshaft in a determined detection position 133275.doc 200925399; and one has an insertion A member of the hole into which the crank shaft can be inserted, and the member is provided on a side closer to the detection position than the crankcase. The crank angle sensor is attached to an attachment portion formed in the member. According to the invention, the attachment portion to which the crank angle sensor is attached is formed in the member 'the member is provided to be closer to the side of the debt detecting position than the crank case. Therefore, the attachment portion can be made shorter than in the case where the attachment portion extends from the crankcase. Therefore, the swing of the crank angle sensor can be reduced. Further, according to an aspect of the invention, the member is an oil pump cover for closing an oil pump casing formed in the crankcase. This configuration allows the oil pump cover to also be used as the above-described member. In this aspect, an oil pump disposed in the oil pump casing and the attachment portion formed in the oil pump cover are positioned on the same side with respect to the crank shaft. With this configuration, since the attachment portion money is on the same side as the oil fruit, the oil pump cover covering the oil pump does not need to be made too large. Moreover, in accordance with one aspect of the invention, the insertion aperture of the member is provided at a location remote from an intermediate portion. This configuration is easy to ensure a space for forming the attachment portion. Further, according to an aspect of the invention, the member has a disk shape and includes the insertion hole at a position offset from an intermediate portion. This configuration is easy to ensure a space for forming the attachment portion. In these aspects, the attachment portion can be positioned on an opposite side of the insertion aperture relative to the intermediate portion. This configuration is easy to ensure a space provided between the crank 133275.doc 200925399 shaft and the attachment portion. Further, according to an aspect of the present invention, a fan that rotates together with the crankshaft is further provided. The attachment portion is formed at a position away from the first-class track. A flow of air generated by the rotation of the fan flows from one side of the crankcase to a side of a cylinder via the flow path. This configuration prevents the air flow from the crank shaft side to the cylinder side from being blocked by the attachment portion and the crank angle acoustic sensor.
另外，根據本發明之一實施例，進一步提供一與該曲柄 軸一起旋轉的風扇。一引導藉由該風扇旋轉產生之氣流的 導壁係形成於該構件中’該附接部分及該導壁在該氣流被 該導壁引導的一個方向中係形成為彼此相鄰。此配置允許 該附接部分及該曲柄角度感測器以及該導壁可引導該氣 流。 在此態樣中，該曲柄角度感測器可附接至該附接部分， 使得該曲柄角度感測器之至少—部分突出該氣流被該導壁 引導到的-個側之-背面。此配置允許該附接部分及該曲 柄角度感測器可引導更多的氣流。 此外’根據本發明之-態樣，在該構件相對於該曲柄轴 箱予以定位後，使用一定位銷將該構件裝配至該曲柄軸 粕。利用此配置，可更容易地裝配該構件。 此外，根據本發明之一跨坐型車輛係一種包含上述任何 一種引擎的跨坐型車輛。該跨㈣車柄之實例包含一機車 匕括-小輪機踏車）、-四輪小車（一全地面車輛）及一雪 車。本發明提供一種能夠減少該弓丨擎中該曲柄角度感測 133275.doc 200925399 器之擺動的跨坐型車輛。 【實施方式】 本發明之-實施例將參考該等圖式而予以描述。 ΟAdditionally, in accordance with an embodiment of the present invention, a fan that rotates with the crankshaft is further provided. A guide wall that guides the flow of air generated by the rotation of the fan is formed in the member. The attachment portion and the guide wall are formed adjacent to each other in one direction in which the airflow is guided by the guide wall. This configuration allows the attachment portion and the crank angle sensor and the guide wall to direct the flow of air. In this aspect, the crank angle sensor can be attached to the attachment portion such that at least a portion of the crank angle sensor protrudes from the side to the back side to which the airflow is directed by the guide wall. This configuration allows the attachment portion and the crank angle sensor to direct more airflow. Further, in accordance with the present invention, after the member is positioned relative to the crankcase, the member is assembled to the crank axle using a locating pin. With this configuration, the member can be assembled more easily. Further, a straddle type vehicle according to the present invention is a straddle type vehicle including any of the above engines. Examples of the span (four) handle include a locomotive-small-turbine treadmill, a four-wheeled trolley (an all-terrain vehicle), and a snowmobile. The present invention provides a straddle-type vehicle capable of reducing the swing of the crank angle sensing in the bow shovel. [Embodiment] The embodiment of the present invention will be described with reference to the drawings. Ο
圖1為根據本發明之一跨坐型車輛的-實施例之機車w 側視圖。該機車1包含-位於·車體前方（在圖示中以_ 不之方向）的剛又2。一前輪3係軸向地支撐於該前又]之下 端’且一把手4係附接於該前又2之上端。此外，該機車】 包含-在$車體之中間的座位7, i一根據本發明之實施 例的引擎10係提供於該座位7之下方。 該引擎10係藉由一附接至一車體架（在該等圖式中未顯 示）的樞軸予以支撐，使得該引擎10可在一上下方向中擺 動。一後臂8係提供至該引擎10之後部，且—後輪9在該後 臂8之後端予以轴向地支撐。此外，一後懸掛6係提供於該 車體架之後端與該後臂8的後端之間。 圖2為根據本發明之實施例的引擎1〇的右側視圖。在該 圖中’ 一覆蓋該引擎10右側之蓋子80内的構造係以虛線表 示。圖3為一沿著圖2中之線m_In的截面圖。圖4為一沿著 圖2中之線iV_IV的截面圖。 圖5顯示一油泵蓋4〇安裝入一曲柄轴箱21之一右側盒21b 的狀態之示意圖。另外，一曲柄角度感測器70係附接至該 圖中顯示的該油泵蓋40。圖6為該右側盒21b之一示意圖。 圖7為該油泵蓋40之一示意圖。 圖8為圖4之一局部放大圖。圖9為一沿著圖5中之線IX-IX的局部剖面圖。這些圖式顯示該曲柄角度感測器7〇及感 133275.doc -9- 200925399 測器附接部分42a、42b。 如圖2及圖3所示’在該引擎ι〇中，該曲柄轴箱21、一汽 缸24及一汽虹頭27係以此順序朝向該車輛之前方予以配 置。一活塞25係提供於該汽缸24中，且一燃燒室271係形 成於該活塞25及該汽缸頭27之間。當在該燃燒室271中之 一空氣燃油混合物被一點火器28點燃並燃燒時，該活塞25 在該汽缸24中往復運動。 該活塞25經由一連接桿23連接至一曲柄軸22，該曲柄軸 22係藉由該曲柄軸箱21予以可旋轉地支撐。因此，該曲柄 軸22關聯於該活塞25之往復運動而旋轉。 該曲柄軸22包含該連接桿23所連接的一曲柄銷221、一 對曲柄臂222a、222b ’該曲柄銷221係配置於其二者之 間、及一對軸部分22a、22b，在該車寬方向中從該等各自 的曲柄臂222a、222b延伸到外面。 該曲柄軸箱21係分成左、右部分，並包含一左側盒2 i a 及右側盒2 1 b。該左側盒21 a及該右側盒21 b係配置有位於 其二者間的該曲柄軸22之該對曲柄臂222a、222b。 在該曲柄軸22之左側的該軸部分22a係由該左側盒21a予 以軸向地支#’並從該左側盒21 a向外地延伸到左邊。一 動力傳送裝置（該等圖式中未顯示）係附接至該轴部分22a， 並將該引擎10產生的動力傳送至後輪9。 另一方面，在該曲柄軸22之右側的該軸部分22b係插入 一形成於該右側盒21b中的插入孔293中。該軸部分22b係 由該右側盒21b予以軸向地支撐，並從該右側盒21b向外地 133275.doc -10- 200925399 延伸至右邊。一之後描述的發電機5〇係提供於該軸部分 22b 上。 該蓋子80係提供於該引擎1〇之右側上。該蓋子8〇覆蓋該 曲柄軸箱21之該右側之一較大部分、該汽缸24及該汽缸頭 27» —發電機外殼1〇〇係形成於該蓋子8〇及該曲柄軸箱 21、該汽缸24與該汽缸頭27之間。 在該車寬方向中朝外側突出的壁211a、211b、211c，係 形成於該右側盒21b之一右側部分26b之一邊緣的背面、上 ❹ 方及該下前方。該蓋子80之一邊緣係固定於這三個壁。此 外’一用於將外面之空氣吸入該發電機外殼1〇〇的進氣門 85係形成於該蓋子80中靠近該軸部分22b之尖端末端。 此外’該點火器28插入的一插入開口 87及一連接至該汽 缸頭27中之一排氣門的排氣開口 88係形成於該蓋子8〇中靠 近該汽缸頭27之處。一排氣管90係附接至該排氣開口 88(參考圖2)。 此外，如圖6所示，一圓形部分290及一開口部分291係 ❿ 形成於該右側盒21b之該右侧部分26b中。該圓形部分290 包含一在其中間部分之上的插入孔293，該轴部分22b係插 入於該插入孔293。該開口部分291在該車寬方向中延伸至 該圓形部分290之外部，以便圍住該圓形部分290。另外， 一在該車寬方向中朝中間凹入之泵附接部分298係形成於 該圓形部分290之該插入孔293之下。如圖4所示，一個擺 線型油泵係附接至該泵附接部分29。 盤形之該油泵蓋40係安裝至該開口部分291中。一油泵 133275.doc 200925399 外殼30係形成於該圓形部分290及該油泵蓋4〇之間。該油 泵蓋40為本發明之一構件的一個實例。此外，一插入孔44 係形成於該油泵蓋40中相對應於該圓形部分290之該插入 孔293的位置，且該軸部分22b係插入該插入孔44。 除了該油泵36之外，一安裝至該軸部分22b中的驅動齒 輪32，及一具有一亦可作為該油泵36之一軸部分使用之軸 部分的從動齒輪34係置於該油泵外殼30中，使得該驅動齒 輪32及該從動齒輪34彼此嚙合。因此，該油泵36隨著該軸 部分22b之旋轉而轉動。 一被該油栗36使用以吸取油的吸取口 298a，及一被該油 泵36使用以將油排出的排放口 ”扑係形成於該泵附接部分 298中。如圖4所示，在一提供於該曲柄軸箱21之底部的儲 油器95中聚集的油從該吸取口 298&經由一吸取通道298d被 吸取至該油泵3 6中。此外，從該油泵3 6排出的油係從該排 放口 298b經由一供應通道（在該等圖式中未顯示）供應至該 引擎10之不同部分。 複數個附接部分295係形成於該圓形部分290的周邊。該 等附接部分295支撐在該開口部分291之尖端末端的油泵蓋 40 ’且該油泵蓋4〇係藉由螺釘固定至該等附接部分295。 若干螺釘孔46係提供於該油泵蓋4〇中相對應於該圓形部分 290之各別附接部分295的位置。 此外’ 一銷孔296係形成於該圓形部分29〇之該周圍邊緣 上"一定位銷47係提供於該油泵蓋4〇之一後表面（在該油 泵外殼30側之一表面），並被插入該銷孔296中。當該定位 133275.doc 12 200925399 銷47係插入在形成於該圓形部分290中的該銷孔296中時， 該盤形油泵蓋40係安裝入該環形開口部分291中》因此， 該油泵蓋40係固定在圓周方向中。因此，該油泵蓋4〇之各 別螺釘孔46係定位於該圓形部分290之各別附接部分295之 位置。 另外’如圖3及圖4所示，該發電機50係在該車寬方向中 . 提供於該右側盒21b的該右侧部分26b及安裝於該右側盒 21b中之該油泵蓋40的外側。該發電機5〇包含一被固定至 ® 該右側盒21b的定子52，及一被固定至該軸部分22b並與該 軸部分22b共同旋轉的轉子55。 該定子52包含一發電線圈，並係附接至圍繞該油泵蓋4〇 之該插入孔44形成的定子附接部分43。該等定子附接部分 43在該車寬方向中沿著該轴部分22b朝外延伸，該定子52 被螺釘固定至該等定子附接部分43。 該轉子55係附接至一安裝至該軸部分22b的轴環部分 ❹ 92，並具有一圍繞該定子52之該外周邊的環形部分557 〇 一磁鐵55 8係沿著該環形部分557之一内周表面予以提供。 此外，若干突出物551在圓周方向上以預定間隔形成於 該環形部分557之外周表面中。這些突出物551係提供以允 許該曲柄角度感測器70偵測該曲柄軸22之旋轉角度。 另外，一風扇60係提供於該軸部分22b的尖端末端。該 風扇60包含一附接至該轉子55之該環形部分557的附接部 分62，及複數個形成於該附接部分62中的扇葉6ι。 該風扇60與該軸部分22b—起旋轉，藉此從提供於該蓋 133275.doc -13- 200925399 子80中的該進氣門85將外面的空氣吸入，以在該發電機外 殼100中產生氣流。所產生的氣流流向該汽缸24侧，如圖2 中之雙點劃線表示’並冷卻該汽缸24。 應注意’如圖2所示，該蓋子80具有一下端部分82b，該 部分在靠近該右側盒21 b及該汽缸24的邊界處變形，使得 一上端部分82a及該汽缸中心之間的距離比該下端部分82b 與該汽缸24中心之間的距離長。此外，如圖5所示，在該 轴部分22b及提供於該右側盒2lb之上側的該壁2ub之間的 距離比該軸部分22b及提供於該右側盒21 b之下前側的該壁 211c之間的距離長。 利用這種方式，該發電機外殼i 00在該上側具有一比靠 近该右側盒21b及該汽缸24之邊界的下側更廣的空間。因 此’藉由該風扇60之旋轉產生之氣流從該軸部分22b之上 流向該汽缸24側。意即在該軸部分22b之上的空間作為該 氣流從該右側盒21b流向該汽缸24側所流經的一個流道％。 此外，在該轴部分22b之下產生的氣流不流向該汽缸24 側，而是流向該後面，並沿著提供於該後面的該壁以“而 供應至上側。然後，該氣流經由該流道98流向該汽缸以 側。應注意該油泵蓋40在該軸部分22b之下前方包含一板 狀的導壁49。該導壁49將在該軸部分之下產生的氣流 引導至後面。 & 此外，該油泵蓋40在該軸部分22b之下的一個位置包含 該對用於附接該曲柄角度感測器7Q的感測器附接部分 42a、42b。該曲柄角度感測器7〇係利用托架72、73而附接 133275.doc 200925399 在该等感測器附接部分42a及42b之間。 該等感測器附接部分42a、42b係位於該油泵蓋之該中 間部分之下的-個位置。因此，相對於該中間部分，該等 感測器附接部分42a、42b係定位在該插人孔44的相對側， 該軸部分22b係插入該插入孔44中。此外，相對於該轴部 分22b ’該等感測器附接部分42a、42b係定位在該油泵36 的相同側。 此外，該等感測器附接部分❿、42b在該氣流被該導壁 49所引導之方向中形成為彼此相鄰。另外，附接在該等感 測器附接部分42a、42b之間的該曲柄角度感測器被附 接’使得該曲柄角度感測器7〇之一部分突出至該氣流被該 導壁49引導到的該側（該軸部分22b側）之背面。 應注意，如圖8及圖9所示，該等感測器附接部分42&、 42b係提供以在該軸部分22b之軸向中從該油泵蓋4〇之一表 面（在該發電機外殼100側之一表面）朝該車寬方向的外侧， φ 即該發電機50所在之處延伸。該等托架72、73被螺釘固定 至該等感測器附接部分42a、42b之尖端末端，使得該曲柄 角度感測器70予以固定。 更詳細地說，該托架72具有一U形形狀，其包含在遠離 肖軸部分22b的-側的一鉤狀中間部分。該曲柄角度感測 器70係由該中間部分予以支撲。此外，該托架㈣兩端都 具有一螺釘孔，並被螺釘固定至該等感測器附接部分 42a、42b。此外，該托架73具有一u形形狀，其在靠近該 軸部分22b的一側具有一朝該油泵外殼3〇側向下延伸。該 133275.doc 200925399 托架73的兩端都具有一螺釘孔，並被螺釘固定至該感測器 附接部分42a、42b。 以這種方式附接至該等感測器附接部分42a、42b的尖端 末端之該曲柄角度感測器70面向該發電機5〇之該轉子55之 一外周表面。該曲柄角度感測器7〇包含一線圈，並藉由輸 出感應電流而偵測該曲柄軸22之旋轉角度，此感應電流是 S k供於該轉子55之該外周表面上的該等突出物551接近 時所產生。 意即’該曲柄角度感測器70之偵測位置係設置到該發電 機50之周圍’該發電機5〇係提供於該軸部分22b之轴向中 遠離該右侧盒21b處，且具體而言，該偵測位置係設置至 面朝與該軸部分22b—起旋轉的該轉子55之該外周表面的 該位置。此外，該曲柄角度感測器7 〇之該债測位置係設置 於該油泵蓋40之車寬方向中的外側之一位置，該油泵蓋4〇 係附接至該右側盒21b之該右側部分26b。 因此’該等感測器附接部分42a、42b在該車寬方向中從 該油泵蓋40之該表面（在該發電機外殼i 〇〇側之表面）延伸至 該發電機50所在處的外侧，且附接至該等感測器附接部分 42a、42b之尖端末端的該曲柄角度感測器7〇係面朝該轉子 55之外周表面予以配置。 因為該油泵蓋40係附接至在該右側盒2ib之該車寬方向 中的該外側’從該曲柄角度感測器7〇之該偵測位置到該油 泵蓋40之該距離短於從該偵測位置到該右側盒21b之該距 離。舉例來說，從該曲柄角度感測器7〇之該偵測位置到該 133275.doc 16 200925399 油泵蓋40之該距離短於從該曲柄角度感測器7〇之該摘測位 置到該右側盒21b中一部分（例如，作為該油泵外殼3〇之該 底部的該圓形部分290(特別是泵附接部分298)或位於該圓 形部分290周圍的該右側部分26b)的距離。 該等感測器附接部分42a、42b以這種方式從該油泵蓋4〇 ^ 延伸。因此’相較於該等感測器附接部分42a、42b係提供 • 以從該右侧盒21b延伸的情況，該等感測器附接部分42a、 42b之長度可被製作地更短。因此，可減少該曲柄角度感 ❹ 測器70之擺動。 此外’該轴部分22b係插入該油泵蓋4〇中之該插入孔 44，且該油泵蓋4〇係配置於該右側盒21b及該發電機5〇之 間，使得該油泵蓋40被安裝並固定至該右側盒21b。因 此，相較於其他構件（例如該蓋子8〇)，該曲柄角度感測器 7〇之擺動可予以減少。 在上文中，係描述本發明的一個實施例。但是，本發明 φ 並不限於上述實施例。在上述實施例中，該油泵蓋40作為 根據本發明之該構件的一個實例而使用。然而，該構件並 不限於該油泵蓋40，如果該構件包含一該曲柄軸22插入的 插入孔，且係提供於一比該曲柄軸箱21更接近該曲柄角度 感測器70之偵測位置的侧面即可。 :外，在上述該實施例中，該曲柄角度感測器7〇之偵測 目‘為與該曲柄轴22共同旋轉的該轉子55。然而，該偵測 目標並不限於該轉子55 ’且另-個與該曲柄轴22 一起旋轉 的構件亦可作為該偵測目標。 133275.doc 200925399 【圖式簡單說明】 圓】為根據本發明之一實施例的跨坐型車辆的 圖。 忍 圖2為根據本發明之實施例的引擎的右側視圖。 圖3為沿著圖2中之線ιΠ_ΙΠ的剖面圖。 圖4為沿著圖2中之線IV_IV的剖面圖。 圖5係顯示一油泵蓋被安裝至一曲柄轴箱之一右側盒中 的狀態之示意圖。 Ο ❹ 圖6為右側盒之一示意圖。 圖7為油泵蓋之一示意圖。 圖8為圖4之局部放大圖。 圖9為沿著圖5中之線ΙΧ-ΙΧ的局部剖面圖。 【主要元件符號說明】 2 3 4 6 7 8 9 10 21 21a 133275.doc 機車 前又 前輪 把手 後懸掛 座位 後臂 後輪 引擎 曲柄軸箱 左側盒 -18- 200925399BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a side elevational view of a locomotive w of an embodiment of a straddle type vehicle in accordance with the present invention. The locomotive 1 includes - just two in front of the vehicle body (in the direction of the _ not shown). A front wheel 3 is axially supported on the front and lower ends and a handle 4 is attached to the front and rear ends. Further, the locomotive includes a seat 7 in the middle of the vehicle body, i. An engine 10 according to an embodiment of the present invention is provided below the seat 7. The engine 10 is supported by a pivot attached to a body frame (not shown in the drawings) such that the engine 10 can swing in an up and down direction. A rear arm 8 is provided to the rear of the engine 10, and the rear wheel 9 is axially supported at the rear end of the rear arm 8. Further, a rear suspension 6 is provided between the rear end of the body frame and the rear end of the rear arm 8. 2 is a right side view of the engine 1 根据 according to an embodiment of the present invention. In the figure, a structure in the cover 80 covering the right side of the engine 10 is indicated by a broken line. Figure 3 is a cross-sectional view along line m_In of Figure 2. Figure 4 is a cross-sectional view taken along line iV_IV of Figure 2. Fig. 5 is a view showing a state in which an oil pump cover 4 is mounted in a right side case 21b of a crank case 21. Additionally, a crank angle sensor 70 is attached to the oil pump cover 40 shown in the figure. Fig. 6 is a schematic view of the right side case 21b. FIG. 7 is a schematic view of the oil pump cover 40. Figure 8 is a partial enlarged view of Figure 4. Figure 9 is a partial cross-sectional view along line IX-IX of Figure 5. These figures show the crank angle sensor 7 and the sense 133275.doc -9-200925399 detector attachment portions 42a, 42b. As shown in Figs. 2 and 3, in the engine ,, the crankcase 21, a cylinder 24, and a steam head 27 are arranged in this order toward the front of the vehicle. A piston 25 is provided in the cylinder 24, and a combustion chamber 271 is formed between the piston 25 and the cylinder head 27. When an air-fuel mixture in the combustion chamber 271 is ignited and burned by an igniter 28, the piston 25 reciprocates in the cylinder 24. The piston 25 is coupled to a crank shaft 22 via a connecting rod 23, and the crank shaft 22 is rotatably supported by the crank axle box 21. Therefore, the crank shaft 22 rotates in association with the reciprocation of the piston 25. The crankshaft 22 includes a crank pin 221 to which the connecting rod 23 is connected, and a pair of crank arms 222a, 222b. The crank pin 221 is disposed between the two, and a pair of shaft portions 22a, 22b. Extending from the respective crank arms 222a, 222b to the outside in the width direction. The crankcase 21 is divided into left and right portions and includes a left side box 2 i a and a right side box 2 1 b. The left side case 21a and the right side case 21b are provided with the pair of crank arms 222a, 222b of the crank shaft 22 between them. The shaft portion 22a on the left side of the crank shaft 22 is axially supported by the left side case 21a and extends outward from the left side case 21a to the left side. A power transmission device (not shown in the drawings) is attached to the shaft portion 22a and transmits the power generated by the engine 10 to the rear wheel 9. On the other hand, the shaft portion 22b on the right side of the crank shaft 22 is inserted into an insertion hole 293 formed in the right side case 21b. The shaft portion 22b is axially supported by the right side case 21b and extends outward from the right side case 21b to the right side 133275.doc -10- 200925399. A generator 5 described later is provided on the shaft portion 22b. The cover 80 is provided on the right side of the engine 1〇. The cover 8 〇 covers a larger portion of the right side of the crank axle box 21, the cylinder 24 and the cylinder head 27»the generator housing 1 is formed on the cover 8〇 and the crank axle box 21, Between the cylinder 24 and the cylinder head 27. Walls 211a, 211b, and 211c that protrude outward in the vehicle width direction are formed on the back surface, the upper side, and the lower front side of one of the right side portions 26b of the right side case 21b. One of the edges of the cover 80 is secured to the three walls. Further, an intake valve 85 for drawing outside air into the generator casing 1 is formed in the cover 80 near the tip end of the shaft portion 22b. Further, an insertion opening 87 into which the igniter 28 is inserted and an exhaust opening 88 connected to one of the exhaust valves of the cylinder head 27 are formed in the cover 8A near the cylinder head 27. An exhaust pipe 90 is attached to the exhaust opening 88 (refer to Fig. 2). Further, as shown in Fig. 6, a circular portion 290 and an opening portion 291 are formed in the right side portion 26b of the right side case 21b. The circular portion 290 includes an insertion hole 293 above the intermediate portion into which the shaft portion 22b is inserted. The opening portion 291 extends outside the circular portion 290 in the vehicle width direction to surround the circular portion 290. Further, a pump attachment portion 298 recessed toward the middle in the vehicle width direction is formed under the insertion hole 293 of the circular portion 290. As shown in Fig. 4, a cycloid type oil pump is attached to the pump attachment portion 29. The oil pump cover 40 of the disk shape is fitted into the opening portion 291. An oil pump 133275.doc 200925399 The outer casing 30 is formed between the circular portion 290 and the oil pump cover 4A. The oil pump cover 40 is an example of a member of the present invention. Further, an insertion hole 44 is formed in the oil pump cover 40 at a position corresponding to the insertion hole 293 of the circular portion 290, and the shaft portion 22b is inserted into the insertion hole 44. In addition to the oil pump 36, a drive gear 32 mounted to the shaft portion 22b, and a driven gear 34 having a shaft portion that can also be used as a shaft portion of the oil pump 36 are disposed in the oil pump casing 30. The drive gear 32 and the driven gear 34 are meshed with each other. Therefore, the oil pump 36 rotates in accordance with the rotation of the shaft portion 22b. A suction port 298a used by the oil pump 36 to suck the oil, and a discharge port used by the oil pump 36 to discharge the oil are formed in the pump attachment portion 298. As shown in Fig. 4, The oil collected in the oil reservoir 95 provided at the bottom of the crankcase 21 is sucked from the suction port 298 & through a suction passage 298d into the oil pump 36. Further, the oil discharged from the oil pump 36 is The vent 298b is supplied to different portions of the engine 10 via a supply passage (not shown in the drawings). A plurality of attachment portions 295 are formed at the periphery of the circular portion 290. The attachment portions 295 An oil pump cover 40' supporting the tip end of the opening portion 291 and the oil pump cover 4 is fixed to the attachment portions 295 by screws. A plurality of screw holes 46 are provided in the oil pump cover 4 corresponding to the The position of the respective attachment portion 295 of the circular portion 290. Further, a "pin hole 296 is formed on the peripheral edge of the circular portion 29" " a positioning pin 47 is provided to one of the oil pump cover 4 Rear surface (on one surface of the oil pump housing 30 side) and is The pin hole 296 is inserted. When the positioning 133275.doc 12 200925399 pin 47 is inserted into the pin hole 296 formed in the circular portion 290, the disc-shaped oil pump cover 40 is fitted into the annular opening portion 291. Therefore, the oil pump cover 40 is fixed in the circumferential direction. Therefore, the respective screw holes 46 of the oil pump cover 4 are positioned at the respective attachment portions 295 of the circular portion 290. 3 and FIG. 4, the generator 50 is provided in the vehicle width direction. The right side portion 26b of the right side case 21b and the outside of the oil pump cover 40 installed in the right side case 21b. 5〇 includes a stator 52 fixed to the right side casing 21b, and a rotor 55 fixed to the shaft portion 22b and co-rotating with the shaft portion 22b. The stator 52 includes a power generating coil and is attached to a stator attachment portion 43 formed around the insertion hole 44 of the oil pump cover 4. The stator attachment portion 43 extends outward in the vehicle width direction along the shaft portion 22b, and the stator 52 is screwed to the a stator attachment portion 43. The rotor 55 is attached to a shaft mounted to the shaft The collar portion ❹ 92 of the portion 22b has an annular portion 557 surrounding the outer periphery of the stator 52. A magnet 55 8 is provided along an inner circumferential surface of the annular portion 557. Further, a plurality of protrusions 551 The outer circumferential surface of the annular portion 557 is formed at a predetermined interval in the circumferential direction. These protrusions 551 are provided to allow the crank angle sensor 70 to detect the rotation angle of the crank shaft 22. In addition, a fan 60 is provided At the tip end of the shaft portion 22b, the fan 60 includes an attachment portion 62 attached to the annular portion 557 of the rotor 55, and a plurality of blades 6ι formed in the attachment portion 62. The fan 60 rotates with the shaft portion 22b, whereby the outside air is sucked from the intake valve 85 provided in the cover 133275.doc -13 - 200925399 sub 80 to be generated in the generator casing 100. airflow. The generated air current flows toward the side of the cylinder 24, as indicated by a chain double-dashed line in Fig. 2, and cools the cylinder 24. It should be noted that as shown in Fig. 2, the cover 80 has a lower end portion 82b which is deformed near the boundary of the right side case 21b and the cylinder 24 such that the distance between an upper end portion 82a and the center of the cylinder is The distance between the lower end portion 82b and the center of the cylinder 24 is long. Further, as shown in FIG. 5, the distance between the shaft portion 22b and the wall 2ub provided on the upper side of the right side case 2lb is larger than the shaft portion 22b and the wall 211c provided on the front side below the right side case 21b. The distance between the two is long. In this manner, the generator casing i 00 has a wider space on the upper side than the lower side of the boundary between the right side casing 21b and the cylinder 24. Therefore, the air flow generated by the rotation of the fan 60 flows from above the shaft portion 22b toward the side of the cylinder 24. That is, the space above the shaft portion 22b serves as a flow path % through which the air current flows from the right side casing 21b toward the side of the cylinder 24. Further, the air current generated under the shaft portion 22b does not flow to the side of the cylinder 24, but flows to the rear side, and is supplied to the upper side along the wall provided at the rear side. Then, the air flow passes through the flow path. 98 flows to the side of the cylinder. It should be noted that the oil pump cover 40 includes a plate-shaped guide wall 49 in front of the shaft portion 22b. The guide wall 49 guides the air flow generated under the shaft portion to the rear. Further, the oil pump cover 40 includes the pair of sensor attachment portions 42a, 42b for attaching the crank angle sensor 7Q at a position below the shaft portion 22b. The crank angle sensor 7 is attached Attached 133275.doc 200925399 between the sensor attachment portions 42a and 42b by brackets 72, 73. The sensor attachment portions 42a, 42b are located below the middle portion of the oil pump cover Therefore, relative to the intermediate portion, the sensor attachment portions 42a, 42b are positioned on opposite sides of the insertion hole 44, and the shaft portion 22b is inserted into the insertion hole 44. Further, The sensor attachment portions 42a, 42b are tied relative to the shaft portion 22b' On the same side of the oil pump 36. Further, the sensor attachment portions ❿, 42b are formed adjacent to each other in a direction in which the airflow is guided by the guide wall 49. In addition, attached to the sensors The crank angle sensor between the attachment portions 42a, 42b is attached 'such that a portion of the crank angle sensor 7 is protruded to the side to which the airflow is guided by the guide wall 49 (the shaft portion 22b side) It should be noted that, as shown in Figures 8 and 9, the sensor attachment portions 42 & 42b are provided to be from the surface of the oil pump cover 4 in the axial direction of the shaft portion 22b ( On the outer side of the side of the generator housing 100, the outer side of the vehicle width direction, φ, where the generator 50 is located. The brackets 72, 73 are screwed to the sensor attachment portions 42a. The tip end of the 42b causes the crank angle sensor 70 to be fixed. In more detail, the bracket 72 has a U-shape including a hook-shaped intermediate portion away from the side of the shawl portion 22b. The crank angle sensor 70 is supported by the middle portion. In addition, the bracket (four) two Each has a screw hole and is screwed to the sensor attachment portions 42a, 42b. Further, the bracket 73 has a U-shape having a pump facing the side of the shaft portion 22b. The outer side of the outer casing 3 extends downwardly. The 133275.doc 200925399 bracket 73 has a screw hole at both ends and is screwed to the sensor attachment portion 42a, 42b. Attached to the same in this manner The crank angle sensor 70 of the tip end of the sensor attachment portion 42a, 42b faces the outer peripheral surface of one of the rotors 55 of the generator 5. The crank angle sensor 7A includes a coil and detects a rotation angle of the crankshaft 22 by outputting an induced current which is supplied to the protrusions on the outer circumferential surface of the rotor 55. 551 is generated when approaching. That is, the detection position of the crank angle sensor 70 is set around the generator 50. The generator 5 is provided in the axial direction of the shaft portion 22b away from the right side box 21b, and In this case, the detection position is set to the position facing the outer peripheral surface of the rotor 55 that rotates with the shaft portion 22b. Further, the debt detecting position of the crank angle sensor 7 is disposed at one of the outer sides of the oil pump cover 40 in the vehicle width direction, and the oil pump cover 4 is attached to the right side portion of the right side case 21b. 26b. Therefore, the sensor attachment portions 42a, 42b extend from the surface of the oil pump cover 40 (the surface on the side of the generator casing i) to the outside of the generator 50 in the vehicle width direction. And the crank angle sensor 7 attached to the tip end of the sensor attachment portions 42a, 42b is configured to face the outer peripheral surface of the rotor 55. Because the oil pump cover 40 is attached to the outer side in the vehicle width direction of the right side box 2ib, the distance from the detection position of the crank angle sensor 7 to the oil pump cover 40 is shorter than The distance from the position to the right side box 21b is detected. For example, the distance from the detected position of the crank angle sensor 7 to the 133275.doc 16 200925399 oil pump cover 40 is shorter than the extracted position from the crank angle sensor 7〇 to the right side. A portion of the cartridge 21b (e.g., the distance from the circular portion 290 (particularly the pump attachment portion 298) of the bottom of the oil pump housing 3 or the right portion 26b) around the circular portion 290. The sensor attachment portions 42a, 42b extend from the oil pump cover 4 〇 ^ in this manner. Thus, the length of the sensor attachment portions 42a, 42b can be made shorter as compared to the case where the sensor attachment portions 42a, 42b are provided to extend from the right side cartridge 21b. Therefore, the swing of the crank angle sensor 70 can be reduced. Further, the shaft portion 22b is inserted into the insertion hole 44 in the oil pump cover 4, and the oil pump cover 4 is disposed between the right side case 21b and the generator 5A, so that the oil pump cover 40 is installed and It is fixed to the right side case 21b. Therefore, the swing of the crank angle sensor 7 can be reduced as compared with other members (e.g., the cover 8). In the above, an embodiment of the invention has been described. However, the present invention φ is not limited to the above embodiment. In the above embodiment, the oil pump cover 40 is used as an example of the member according to the present invention. However, the member is not limited to the oil pump cover 40, if the member includes an insertion hole into which the crank shaft 22 is inserted, and is provided closer to the detection position of the crank angle sensor 70 than the crank axle box 21. The side can be. Further, in the above-described embodiment, the crank angle sensor 7 is detected by the rotor 55 which is rotated together with the crankshaft 22. However, the detection target is not limited to the rotor 55' and another member that rotates together with the crankshaft 22 can also serve as the detection target. 133275.doc 200925399 [Simple Description of the Drawing] A circle is a diagram of a straddle type vehicle according to an embodiment of the present invention. Figure 2 is a right side view of the engine in accordance with an embodiment of the present invention. Figure 3 is a cross-sectional view along line ι Π ΙΠ in Figure 2 . Figure 4 is a cross-sectional view taken along line IV_IV of Figure 2 . Fig. 5 is a view showing a state in which an oil pump cover is mounted in a right side case of a crankcase. Ο ❹ Figure 6 is a schematic view of the right side box. Figure 7 is a schematic view of the oil pump cover. Figure 8 is a partial enlarged view of Figure 4. Figure 9 is a partial cross-sectional view along the line ΙΧ-ΙΧ in Figure 5. [Main component symbol description] 2 3 4 6 7 8 9 10 21 21a 133275.doc Locomotive Front front wheel Handle Rear suspension Seat Rear arm Rear wheel Engine Crank axle box Left side box -18- 200925399
133275.doc 21b 右側盒 22 曲柄軸 22a ' 22b 轴部分 23 連接桿 24 汽缸 25 活塞 26b 右側部分 27 汽缸頭 28 點火器 30 油聚外殼 32 驅動齒輪 34 從動齒輪 36 油栗 40 油系蓋 42a ' 42b 感測器附接部 43 定子附接部分 44 插入孔 46 螺釘孔 47 定位銷 49 導壁 50 發電機 52 定子 55 轉子 60 風扇 -19- 200925399 61 62 70 72 ' 73133275.doc 21b Right side box 22 Crank shaft 22a ' 22b Shaft part 23 Connecting rod 24 Cylinder 25 Piston 26b Right side 27 Cylinder head 28 Igniter 30 Oil accumulation housing 32 Drive gear 34 Drive gear 36 Oil pump 40 Oil system cover 42a ' 42b Sensor Attachment 43 Stator Attachment Port 44 Insertion Hole 46 Screw Hole 47 Locating Pin 49 Guide Wall 50 Generator 52 Stator 55 Rotor 60 Fan-19- 200925399 61 62 70 72 ' 73
80 82a 82b 85 87 88 90 92 95 98 10080 82a 82b 85 87 88 90 92 95 98 100
21 la、21 lb、21lc 221 222a ' 222b 271 290 291 293 295 296 扇葉 附接部分 曲柄角度感測器 托架 蓋子 上端部分 下端部分 進氣口 插入開口 排氣開口 排氣管 軸環部分 儲油器 流道 發電機外殼 壁 曲柄銷 曲柄壁 燃燒室 圓形部分 開口部分 插入孔 附接部分 銷孔 133275.doc -20- 200925399 298 泵附接部分 298a 吸取口 298b 排放口 298d 吸取通道 551 突出物 ' 557 環形部分 558 磁鐵 ❹ 〇 133275.doc -21 ·21 la, 21 lb, 21lc 221 222a ' 222b 271 290 291 293 295 296 Fan blade attachment part crank angle sensor bracket cover upper end part lower end part air inlet insertion opening exhaust opening exhaust pipe collar part oil storage Flow channel generator housing wall crank pin crank wall combustion chamber circular portion opening portion insertion hole attachment portion pin hole 133275.doc -20- 200925399 298 pump attachment portion 298a suction port 298b discharge port 298d suction channel 551 protrusion ' 557 Ring Section 558 Magnet ❹ 〇133275.doc -21 ·