201111618 六、發明說明： 【發明所屬之技術領域】 本發明係關於一種引擎及具備其之跨坐型車輛，更特定 而言’本發明係關於一種包括用以檢測廢氣之氧濃度之: 濃度感測器之引擎及具備其之跨坐型車輛。 又 【先前技術】 作為此種先前技術，提出有一種例如專利文獻丨所示之 單缸引擎。 參照圖19(a)及（b)，專利文獻丨所揭示之單缸引擎係汽缸 蓋（cylinder head)la於其外周面包含隆起部。，且以貫通 隆起部2a之方式形成有排氣料心並且，用以檢測= 之氧濃度之氧濃度感測器4a係以於汽缸蓋丨a之汽缸蓋上蓋 (cylinder head cover)安裝用之凸緣“與汽缸蓋^之隆起部 2a間之凹部中，相對引擎之汽缸軸線傾斜之方式，安裝於 隆起。卩2a又，氧濃度感測器4a係以其檢測部位於排氣通 路3a内之方式安裝於隆起部。。此種氧濃度感測器飩係由 穿過排氣通路3a之高溫廢氣加熱而迅速升溫至該感測器激 活之溫度為止。因此，可實現直熱式（heaterless)之氧濃度 感測器。 a 又，於專利文獻2中，揭示有先前技術之其他例。 參，.’、0 20專利文獻2揭示之單缸引擎係自汽缸軸線之 前方觀察，於汽缸蓋lb之左側部形成有收納用以驅動凸輪 軸（cam shaft)之正時鏈條（Timing chain)之空間2b。於汽缸 蓋lb之下部，以向右傾斜之方式形成有排氣口儿。並且， 150169.doc 201111618 2檢測廢氣之氧漠度之氧遭度感測器4b係以其檢测部位 排氣口3b内之方式安裝於汽缸蓋化。即便該單紅引擎 中’氧丨農度感測器4b亦由穿仍姐名π k 一 由穿過排軋口 3 b之尚溫廢氣加熱而 迅逮升溫至該感測器激活之溫度為止。因&， 式之氧濃度感測器。 、 … 再者，於圖及圖20中，係將曲柄轴方向定義為 向，Α缸軸線方向定義為前後方向，肖曲柄軸及汽虹轴線 均正交之方向定義為上下方向。 [先前技術文獻] [專利文獻] [專利文獻1]日本專利4丨52796號公報 [專利文獻2]曰本專利特開之⑻卜丨83489號公報 【發明内容】 [發明所欲解決之課題] 專利文獻1之氧濃度感測器4a係配置成與用以將汽缸蓋 1 a結合於缸體之螺絲柱部6&、或設置於汽缸蓋h之前方之 汽缸蓋上蓋不產生干擾。然而，如圖19(b)所示，氧濃度感 測器4a即便避開凸緣5a安裝，氧濃度感測器“之前端部亦 沿汽紅蓋1 a之左方向凸出。 又，專利文獻2之氧濃度感測器仆係設置成自排氣口孙 之右側部向右延伸，從而避免與汽缸蓋比之左側部或气缸 蓋上蓋產生干擾。然而，若自汽缸軸線方向觀察汽缸苗 lb ’則氧濃度感測器4b之前端部（於圖20中為右端部）係广 汽缸蓋lb之右方向大幅度凸出。 150169.doc 201111618 、農：：:Γ即便專利文獻1及2之任-引擎中，均會導致氧 =測器向汽蓋之左方向或右方向凸出，造成引擎尺 方^雀尤其早虹引擎或v型雙虹引擎原本具有可使左右 π '、/、之特性，卻使如此之特性極大受損。 跨坐刑鱼本毛明之主要目的在於提供一種引擎及具備其之 s. 該引擎係即便於汽缸蓋中廢氣溫度較高之位 =置氧濃度感測器，亦可防止氧濃度感測器向汽紅蓋 則凸出，從而可抑制引擎之尺寸。 .201111618 VI. Description of the Invention: [Technical Field] The present invention relates to an engine and a straddle-type vehicle provided therewith, and more particularly, the present invention relates to a method for detecting oxygen concentration of exhaust gas: The engine of the detector and the straddle-type vehicle with it. Further [Prior Art] As such a prior art, there has been proposed a single cylinder engine such as that shown in the patent document. Referring to Figures 19(a) and (b), the single cylinder engine cylinder head 1a disclosed in the patent document 包含 includes a ridge on its outer peripheral surface. The exhaust gas core is formed so as to penetrate the ridge portion 2a, and the oxygen concentration sensor 4a for detecting the oxygen concentration of the cylinder head is installed for the cylinder head cover of the cylinder head 丨a. The flange is attached to the ridge in a recess between the ridge 2a of the cylinder head and the cylinder axis of the engine. In addition, the oxygen concentration sensor 4a is located in the exhaust passage 3a with its detecting portion. The method is installed in the ridge portion. The oxygen concentration sensor is rapidly heated by the high-temperature exhaust gas passing through the exhaust passage 3a to the temperature at which the sensor is activated. Therefore, direct heat type (heaterless) can be realized. The oxygen concentration sensor is also disclosed in Patent Document 2. Another example of the prior art is disclosed in the patent document 2. The single cylinder engine disclosed in Patent Document 2 is viewed from the front of the cylinder axis in the cylinder. A left side portion of the cover lb is formed with a space 2b for accommodating a timing chain for driving a cam shaft. A lower portion of the cylinder head lb is formed with an exhaust port inclined to the right. , 150169.doc 201111618 2 detection The oxygen level sensor 4b of the oxygen inversion of the exhaust gas is attached to the cylinder head in such a manner as to be in the detection portion exhaust port 3b. Even in the single red engine, the 'oxygen farmer degree sensor 4b is worn. Still the name π k is heated by the warm exhaust gas passing through the discharge port 3 b and is heated up to the temperature at which the sensor is activated. Because of &, the oxygen concentration sensor of the type. In the figure and FIG. 20, the crankshaft direction is defined as the direction in which the cylinder axis direction is defined as the front-rear direction, and the direction in which the crank axis and the steam-axis axis are orthogonal is defined as the up-and-down direction. [Prior Art Document] [Patent [Patent Document 1] Japanese Patent Publication No. 4,52,796 [Patent Document 2] Japanese Patent Laid-Open No. Hei. The detector 4a is configured not to interfere with the screw cap portion 6& which is used to couple the cylinder head 1a to the cylinder block, or the cylinder head cover which is disposed before the cylinder head h. However, as shown in Fig. 19(b) It is shown that the oxygen concentration sensor 4a is installed even away from the flange 5a, and the oxygen concentration sensor "the front end is also 1 a red top vapor Zhizuo projecting direction. Further, the oxygen concentration sensor of Patent Document 2 is disposed to extend rightward from the right side portion of the exhaust port to avoid interference with the left side portion of the cylinder head or the upper cover of the cylinder head. However, if the cylinder seedling lb' is viewed from the cylinder axis direction, the front end portion (the right end portion in Fig. 20) of the oxygen concentration sensor 4b is largely convex in the right direction of the wide cylinder head lb. 150169.doc 201111618, Agriculture::: Even in the patent documents 1 and 2 - the engine will cause oxygen = the detector protrudes to the left or right direction of the steam cover, causing the engine ruler to be especially early The engine or the v-type double-roof engine originally had the characteristics of making the left and right π ', /, but greatly impairing such characteristics. The main purpose of the cross-sitting fish is to provide an engine and its s. The engine can prevent the oxygen concentration sensor from moving even if the temperature of the exhaust gas in the cylinder head is higher than the oxygen concentration sensor. The steam red cover protrudes, which suppresses the size of the engine. .
[解決課題之技術手段] 根據本發明之1樣，將提供—㈣擎，其 之Γ’且包括：汽缸蓋，其包含蓋本體及自蓋本 5、夕側犬出之突出部；燃燒凹部’其形成於蓋本體·排 二通路’其係形成為自燃燒凹部貫通突出部，以自燃燒凹 部排出廢氣；以及氧濃度感測器’其包括本體部及設置於 本體部之檢測部’以檢測廢氣之氧濃度；且，氧濃度感測 裔係以自汽缸軸線之方向觀察使本體部及檢測部與突出部 重合且使檢測部之至少—部分位於排氣通路内之方式 裝於突出部。 於本發明中’汽缸蓋係包括蓋本體及自蓋本體向外側突 出之犬出冑’且以貫通突出部之方式形成有排氣通路。並 且，以自汽缸軸線之方向觀察使本體部及檢測部與突出部 重合且使檢測部之至少一部分位於排氣通路内之方式，將 氧濃度感測器安裝於突出部。藉此，即便於廢氣溫度較高 之位置設置氧濃度感測H，亦可防止氧濃度感測器相較汽 150169.doc 201111618 缸蓋進而向外側突出。因此，單缸或v型雙缸之引擎不會 損及左右方向緊凑之特性，從而可抑制單缸或v型雙缸^ 引擎尺寸。再者，汽缸蓋係僅突出部之部分向外側突出， 但由於可相應地縮短安裝於汽缸蓋之排氣裝置，因此引擎 周邊之結構不會增大。 較佳為氧’辰度感測器係以本體部相較檢測部位於前方 之方式’安裝於突出告p。於該情料，可冑免本體部與紅 體之空氣冷卻用之散熱片（fin)或曲柄軸箱（crankcase產生 干擾，故而可易於將氧濃度感測器安裝於汽缸蓋且避免沿 左右方向凸出。 又，較佳為，氧濃度感測器係以使氧濃度感測器之中心 軸線與汽缸軸線平行之方式，安裝於突出部。於該情形 時，可容易防止氧濃度感測器向汽缸蓋外側凸出。 進而較佳為，突出部係自蓋本體至少向下方突出。於該 情形時’可有效利用蓋本體之下方之空間，設置突出部。 較佳為，突出部係自汽缸軸線方向觀察，自蓋本體向斜 下方突出。於該情形時，可一面確保突出部之長度，一面 緊湊地形成汽缸蓋。 又，較佳為，氧濃度感測器係以自汽缸軸線方向觀察， 相較蓋本體而不向左右方向突出之方式所配置。於該情形 時’可更準確防止氧濃度感測器向汽缸蓋之外側凸出，從 而可進一步抑制引擎之尺寸。 而較佳為’犬出部係包括作為排氣通路之下游端之開 ’且開口部之中心自汽缸軸線方向觀察，相較蓋本 150169.doc 201111618 體’於左右方向上不位於外側。於該情形時，可抑制突出 部向汽缸蓋之外側凸出，從而可進—步抑制引擎之尺寸。 較佳為，蓋本體之外周面係包括自汽缸軸線之方向觀察 向蓋本體之内側凹陷之凹部，且突出部形成於凹部。於該 情形時’由於可在凹部附近將氧濃度感測器安裝於突出 部，因此可抑制突出部向汽缸蓋之外側突出。因此，可緊 凑地形成汽缸蓋。 ’' 又，較佳為’凹部係向上方凹陷。於該情形時，可—面 確保設置於凹部之突出部之長度’ 一面緊凑地形成汽缸 蓋。 進而較佳為，凹部係向側方凹陷。於該情形時，可一面 破保設置於凹部之突出部之長度，一&緊凑地形成汽缸 蓋。 較佳為，凹部係形成為使蓋本體之角部凹陷。於該情形 時，可一面確保設置於凹部之突出部之長度，一面緊湊地 形成汽缸蓋。 又，較佳為，引擎更包括設置於汽缸蓋之前方之汽缸蓋 上蓋、以及設置於汽缸蓋上蓋以覆蓋本體部之至少前方的 感測器蓋部。於該情形時，可由突出部及感測器蓋部覆蓋 氧濃度感測器之前後。因此，於將引擎載置於跨坐型車輛 之情形時，可適當地保護氧濃度感測器免受路面碎石等之 衫響。又’氧濃度感測器係以自汽缸轴線之方向觀察與突 出部重合之方式安裝於突出部，且位於汽缸蓋之附近，因 此感測器蓋部不會變大。 150169.doc 201111618 佳為，弓！擎係包括設ι π气缸盍〜 上蓋，、、扣 >飞缸蓋係包含安裝有汽缸蓋上蓋之上蓋安裝面，突 出部係&人_ 3女裝有氧濃度感測器之感測器安裝面，且上蓋 成导 、 /、感測器安裝面形成為彼此平行。於該情形時，可 ;*由機械加工而形成上蓋安裝面與感測器安裝面。 苗，★為，引擎更包括設置於汽缸蓋之前方之汽缸蓋上 部<、：缸蓋係包含安裝有汽缸蓋上蓋之上蓋安裝面，突出 L糸包含安裝有氧濃度感測器之感測器安裝面，且上蓋安 ί::感測器安裝面位於同一平面上。於該情形時，可藉 可# t加工而同時形成上蓋安裝面與感測器安裝面，從而 可更各易獲得汽缸蓋。 :’較佳為，引擎更包括設置於汽缸蓋之前方之汽缸蓋 二以及連接於本體部且沿著汽紅蓋上蓋而配 線。於該情形時，可以盥 —+ Έ 方彳，κ /、/成於气缸盍之排氣通路隔開之 二，配置電線。因此，來 成之影變轡丨 排乳通路之排氣熱對電線造 缸•上；故可抑制電線劣化…可藉由以沿著汽 :盖之方式配置電線，而縮小 之空間β 叫·包踝所需 .進而較佳為，引擎包括設置於 苗 保持部。於該情形時，可， …以保持電線之 签Ρ 了錯由保持部，而易於以沿著、、，Α 盍上盍之方式配置電線，故而佈線變得容易。 Ά ::本發明之引擎’可防止氧濃度感測器向 凸出，從而可抑制引擎之尺寸。因此，若 之外 應用於機車等跨坐型車 X月之引擎 尘車輛則可抑制跨坐型車輛變大。 150169.doc 201111618 較佳為，汽缸軸線係朝前方斜著向上傾斜◎於該情形 時，:抑制引擎向下方凸出。因此，此種構成將較佳用於 具備單缸或v型雙缸之引擎之跨坐型車輛。 於本發明中，對汽紅蓋而言所謂「外側」，係指與汽缸 軸線正交且自汽缸軸線放射狀延伸之方向，不僅包括左右 方向’而且包括上下方向。 *又’所謂「自汽缸軸線之方向觀察，本體部及檢測部與 犬出部重合」，係指自汽缸抽線之方向觀察，本體部及檢 測部不自突出部之輪廓伸出。 =發明之上述目的及其他目的'特徵、態樣及優點將根 ”隨附圖式關聯進行之以下本發明之實施形態之詳細說 明而更加明晰。 [發明之效果] 置=本發明’即便於汽缸蓋中廢氣溫度較高之位置處設 很度感測器’亦可防止氧濃度感測器向汽紅蓋之外側 出’從而可抑制引擎之尺寸。 【貫施方式】 2下’參照圖式，對本發明之實施形態進行說明。 向，子於本發明之引擎’將曲柄軸方向定義為左右方 均正2 #❹^義為前後方向，與曲柄轴及汽缸軸線 車而：之方向定義為上下方向。就本發明之實施形態之機 態為a進係Γ乘員朝向車把（handle)乘坐於機車座椅之狀 之十字壯甚疋義左右方向前後方向及上下方向。圖式中 _頭係表示方向者’「F」表示前方，「Rr」表示 150169.doc 201111618 後方，「U」表示上方，「Lo」表示下方，「R」表示右側， 「L」表示左側。 圖1係表示具備本發明之一實施形態之引擎36之所謂速 可達（scooter)型機車1〇之左側視圖。 參照圖1 ’機車1〇係包括車體車架12。於車體車架12之 前部之上方及下方，分別設置有車把14及前輪16。於車體 車架12之後部上方，設置有供乘員乘坐之座椅18。於車把 14與座椅18之間，以沿著車體車架12之方式，設置有用以 供乘員擱腳之腳踏（foot rest)20。腳踏20係以擱置乘坐於 座椅18之乘員之右腳之部分與擱置左腳之部分以相同高度 連績之方式而形成。藉此，於車把14與座椅18之間且腳踏 20之上方’形成有較大空間。車體車架12係以穿過腳踏2〇 之下方之方式設置。 車體車架12係包括左右隔開配置之一對車架22(參照圖 3)。一對車架22係於左右方向彼此留有特定間隔而設置， 且朝後方斜著向上延伸。於一對車架22，經由連桿機構24 而支撐動力單元（p〇wer unit)26可上下自如擺動。 連桿機構24係包括連結一對車架22之樞軸（piv〇t shaft)28、以及連結樞軸28與動力單元26且設置為以樞轴 2 8為中心沿上下方向自如擺動之連桿構件3 〇。 動力單元26係設置於座椅18之下方，且動力單元26之後 郤與車架22係由後避震器單元（rear cushi〇n unit)32連結。 於動力單元26之後端部設置有後輪34。 圖2係表示動力單元26、後輪34及其附近之左側視圖。 150169.doc -11 - 201111618 圖3係自汽缸軸線A之前方觀察車體車架i2、動力單元％、 後輪34及其附近之圖解圖。 動力單元26係包括例如空冷式單缸引擎％、卩及收納著 包含變速機或減速機等之動力傳動裝置（未圖示）之傳動箱 38 ° 於機車10側視時，引擎36係與車架22交又。引擎妬係包 括曲柄轴40、曲柄軸箱42、缸體料、汽缸蓋钧及汽缸蓋上 蓋48»曲柄軸箱42、缸體44、汽缸蓋粍及汽缸蓋上蓋係 以自車輛刖後方向之後方朝向前方之順序，設置於引擎％ 之^缸軸線八上。曲柄軸箱42、缸體44、汽缸蓋及汽缸 蓋上盍48係與相鄰之構件連接。如圖〖及圖2所示，汽缸軸 線Α係相對於車輛前後方向，朝前方斜著向上傾斜於該 實施形態中’係為略微傾斜。 曲柄軸箱42係支撐沿左右方向延伸之曲柄軸仂使其可旋 轉。如圖3所不，曲柄軸箱42之右部係設置於車架之後 方。又，以動力單元26不與車架22產生干擾且可沿上下方 向擺動之方式，將缸體44、汽缸蓋46及汽缸蓋上蓋48以自 汽缸軸線A方向觀察，設置於左右一對車架22之間。 傳動箱38係設置於車架22之後方且曲柄軸箱“之左側。 於傳動箱38之後端部安裝著後輪34且使其旋轉自如。後輪 3 4係以與傳動箱38排列於車輛寬度方向之方式設置於引擎 3 6之後方。由引擎36產生之驅動力係經由動力傳輸裝置傳 輸至後輪34。 如下所述’於汽缸蓋46，設置有用以檢測由引擎36之燃 150169.doc -12· 201111618 燒室90(汽缸蓋46之燃燒凹部7〇)排出之廢 〃 濃度感測器50、以及用以檢測流動於^擎^内之 度的油溫感測器52。又，於汽缸蓋46 <皿 派 上表面，連接有用 以經由引擎36之吸氣通路74對燃燒室％供給 置54。於汽缸蓋46之下部，連接 二虱之吸軋裝 一 運接有用以自引擎36之燃燒室 9 0經由排氣通路8 〇將廢氣排出之排氣裝置$ 6。 參照圖4〜圖8，對引擎36進行詳細說明。 圖4係自汽紅軸線A之前方觀察引擎36之圖解圖。圖％ 表示引擎36之主要部分之右側視圖。圖6係表μ擎％之 主要部分之立體圖。圖7係圖4之w線局部剖面圖解圖。圖 8係圖5之IMI線剖面圖。 缸體44係於其外側面包含空氣冷卻用之散熱片58，且於 其内部包含沿汽缸軸線八之方向延伸之圓柱狀之汽缸孔 (cylinder b〇re)60。於汽缸孔6〇内，可往復運動地設置有 活塞（PiSt〇n)62。活塞62係經由連桿（c〇n叫64而連結於曲 柄軸40〇再者，所謂汽缸軸線A，係指汽缸孔⑽之中心軸 線。 /飞虹蓋46係包括盍本體65及突出部66。突出部係設置 於盍本體65之外周面，且向蓋本體65之外側突出。參照圖 及圖6，盘本體65之外周面係包含自汽缸轴線a之方向觀 察向盍本體65之内側凹陷之彎曲狀之凹部68。亦即，凹 部68係相較蓋本體65之下表面65a向上方凹陷。又，凹部 係向側方（該實施形態中’係相較蓋本體65之右面65b而 向左側）凹陷。進而，凹部68係形成為使蓋本體65之角部 150169.doc 201111618 凹陷。進而換t + ' ，凹部68係以向汽缸軸線A方向延伸之 方=，形成於蓋本體65之外周面。 出。p 66係自汽缸軸線A之前方觀察形成於凹部μ。 以自汽紅轴線A之前方觀察，自蓋本體“朝右 I:缸二下大出之方式形成。再者，氧濃度感測器50係以自 線八之方向觀察，相較蓋本體65不向左右方向突出 之方式配置。 A如圖7所示，於包含於汽缸蓋46之蓋本體65之後方端 二有燃燒凹部70。燃燒凹部70與汽缸蓋46之上表面 燃镇指聽由吸氣通路74而連通。吸氣通路74之面向 燃燒凹部7 0之問CT A、72 γ 裝晉以ρ 成為吸氣口 76。於開口部72連接有吸氣 ”犬出0P 66之開口部78係經由排氣通 、。排氣通路80之面向燃燒凹部7〇之 氣口 82。於穿ψ却“ > „a 取句徘 、犬出°M6之開口部78連接有排氣裝置56。排氣 裝置56係於其端部包含凸 u ,、。 立使用柱碩螺栓（stud )6及螺母88而將凸緣部84安裝於突出部66。 參照圖4，自汽缸軸線A之前方觀察引擎％時，形成於、、气 缸^ 46之排氣通路8〇係形成為相對上下方向（與曲柄軸如 軸線A均正交之方向)傾斜地向下方延伸。更具體而 己’自^軸線A之前方觀察引擎36時，形成於汽缸宴Μ 之排乳通路80係形成為自燃燒請（燃燒凹部％及排氣口 82朝右斜著向下延伸。又’作為排氣通路80之下游端之突 出部66之開口部78係朝向相對上下方向傾斜之方向。更且 體而言，作為排氣通路80之下游端之突出部66之開Μ 150169.doc •14- 201111618 係朝向右斜下方。進而’開口部78之中心79係自汽缸軸線 A之方向觀察，相較蓋本體65，於左右方向上不位於外 側°如此般，排氣通路80亦形成於突出部66。排氣通路8〇 係沿著與設置於引擎36之左側部分之傳輸構件98及旋轉構 件100(下述）分離之方向延伸。再者，燃燒室9〇係由汽缸孔 60與活塞62所包圍之空間及燃燒凹部7〇所形成。 於引擎36中，空氣係穿過吸氣裝置54及吸氣通路74而導 入至燃燒室90。廢氣係自燃燒室9〇穿過排氣通路8〇及排氣 裝置56而排出。 參照圖7,引擎36更包括汽門裝置92、吸氣閥（va][ve)94 及排氣閥96。 汽門裝置92係包括傳輸構件％、旋轉構件1〇〇、凸輪軸 (cam Shaft)1〇2'凸輪104及臂桿構件1〇6、1〇8。傳輸構件 98係包含例如金屬鏈條，且連結曲柄軸與旋轉構件 100，以將曲柄軸40之旋轉傳遞至旋轉構件1〇〇。旋轉構件 1 〇〇係包含例如鏈輪（sprocket)，且藉由傳輸構件98而進行 旋轉。凸輪軸1〇2係藉由旋轉構件1〇〇而進行旋轉，臂桿構 件1G8係藉由設置於凸輪轴⑽上之凸輪iq4而進行擺 動。並且，吸氣閥94係藉由臂桿構件1〇6而開關吸氣口 76，排氣閥96係藉由臂桿構件i 〇8而開關排氣口 82。 汽缸蓋46係包含安裝有^蓋上蓋48之上蓋安裝面 U〇。如圖4~圖6所示，例如自汽叙蓋上蓋48之前表面安裝 複數個(該實施形態中為兩個)螺釘等緊固構件⑴，藉此將 仏蓋上㈣固^汽缸蓋46。藉由如此般’將汽缸蓋上 150169.doc 15 201111618 蓋48安裝於上蓋安裝面110，而使汽缸蓋46無需汽缸蓋上 蓋安裝用之凸緣。因此，可以沿汽缸軸線A方向延伸之方 式，設置氧濃度感測器50。作為緊固構件丨丨i，可使用柱 頭螺栓與螺母、或鉚釘（rivet)等普通之緊固構件。 突出部66係包含感測器安裝面112，且於感測器安裝面 H2安裝有氧濃度感測器5〇 ^ 上蓋安裝面110與感測器安裝面丨12係形成為彼此平行。 此處應注意到，用以檢測穿過排氣通路8〇之廢氣之氧濃 度之氧濃度感測器50係以自汽缸軸線八之方向觀察，與汽 缸蓋46之突出部66重合之方式，安裝於突出部“之感測器 安裝面U2。所言胃「氧濃度感測器^自：气缸轴線八之方向觀 察，與突出部66重合」’係指自汽缸車由線八之方向觀察時， 氧濃度感測器50不自突出部66之輪廓中伸出。如下所述， 氧濃度感測器5 0之中心軸線B既可與汽缸軸線a平行，亦 可相對汽缸軸線A傾斜。 於感測器安裝面112中，平行於汽红轴線A，形成有與排 氣通路80連通之安裝孔114。安裝孔ιΐ4係包含内螺紋部 116。 氧濃度感測器50係包括柱狀之本體部丄18、以及與本體 部m同轴且設置於本體部118之—端之圓柱狀之檢測部 120。氧濃度感測器50係形成為鈿 又句釉向之長度大於半徑之柱 狀。本體部11 8係包含外螺纹邱】 3 「崎、又。P 122。於該實施形態中，本 體部118之直徑並非固定，而θ m 土 而疋因軸向之位置不同而不 同。 150169.doc 16· 201111618 於將氧濃度感測器50安裝於突出部㈤夺，以將檢測部 120插入至安裝孔114且面向排氣通路80内之方式，將外螺 紋部122旋入内螺紋部116。氧濃度感測器50係以自汽虹軸 線A之方向觀察’本體部m及檢測部12〇與汽缸蓋私之突 出。P 66重。之方式’安裝於突出部“。又氧濃度感測器 5〇係以沿著凹部68之方式安裝於突出部66。換言之，柱狀 之氧濃度感測器50係沿著凹部68延伸之方向設置。於氧濃 度感測器50之安裝狀態下’氧濃度感測器5q之中心抽線B 與汽缸軸線A達到平行，且檢測部12〇之至少一部分位於排 氣通路8 0内。 於本體部118之另一端部連接有電線124之連接器 (connector)125。於該實施形態中，電線124係相對本體部 118可自如裝卸。氧濃度感測器50之檢測部12〇係包含例如 穩定化之鍅而構成，故於特定之感測器激活溫度以上時， 可準確檢測。由於檢測部12〇之至少一部分係位於供高溫 廢氣流通之排氣通路8〇内’因此’檢測部12〇係由廢氣加 熱。因此’氧濃度感測器50可迅速達到感測器激活溫度。 因此’作為氧濃度感測器50 ’可使用無需用以加熱檢測部 120之另外之加熱機構之直熱式感測器，因此氧濃度感測 器50變小且成本下降。 氧濃度感測器50之檢測信號係經由電線124而傳送至引 擎控制裝置126。引擎控制裝置126係基於所傳送之檢測信 號’將供給至燃燒室90之燃料之空燃比控制為最佳狀態。 具體而言’引擎控制裝置126係驅動設置於吸氣裝置54之 150169.doc -17- 201111618 燃料喷射閥128，對供給至燃燒室9〇之空氣喷射燃料。 又，如圖4、圖6及圖8所示，汽缸蓋46係於其側面包含 油溫感測益安裝用之螺絲柱部丨3 〇。螺絲柱部i 3 〇係形成於 汽缸蓋46之右側面之上部。螺絲柱部13〇之螺絲柱孔132係 與形成於汽缸蓋46之内部之機油通路134相連。機油通路 134係形成為與汽缸軸線A平行。又，於汽缸蓋“内形成有 凸輪軸102之軸座部136。軸座部136與螺絲柱孔132係藉由 機油通路138而連通。於此種螺絲柱部13〇安裝有油溫感測 器52。 若由曲柄軸箱42支撐之曲柄軸4〇進行旋轉，則將經由曲 柄軸箱42内之惰輪（idler gear)驅動‘油泵。如此—來，則機 油將自油泵穿過形成於曲柄軸箱42之機油通路、形成於曲 柄軸箱42與缸體44之接觸面之機油通路、形成於缸體44之 機油通路、形成於汽缸蓋46之機油通路134，供給至凸輪 軸102及汽門裝置92。 又’機油係自油泵供給至曲柄轴4〇 及機油冷卻器（oil⑽㈣。如此般自油栗直接連接之線路 中，於曲柄軸40之旋轉過程中，始終強制性供給有機油。 油溫感測器52係設置於接近燃燒室9〇且於曲柄軸之旋 轉過程t機油始終流動之位置。因此，於曲柄軸⑽之旋轉 過程中’可藉由油溫感測H52準確且穩定地檢測出辦燒室 9〇之溫度、亦即引擎36之溫度。油溫感測器52之檢測值係 用於設定或修正燃料喷出量。 於蓋 ，以 .根據具備此種引擎36之機車10,汽紅蓋46係構成為 本體65之外周面中之右斜下方之面包含突出部“，且 150169.doc •18- 201111618 自燃燒室90朝右斜著向下延伸貫通突出部“之方式形成有 排氣通路80。突出部66之下游端之開口部78係朝向右斜下 方。並且，以自汽缸軸線A之方向觀察 之本體部118及檢測部120與突出部％重合且使檢測部120 之至少-部分位於排氣通雜内之方式，將氧濃度感測器 5〇安裝於突出部66。 藉此，即便於廢氣溫度較高之位置、亦即汽虹蓋^之突 出部66設置氧濃度感測器5〇,亦可防止氧濃度感測器50相 較汽缸蓋46向外側（尤其左右方向）凸出。-因此單缸之引 擎36可無損左右方向上之緊湊性特性，而抑制單缸之引擎 3一6之尺寸。又，氧濃度感測器50係不相較汽缸蓋上蓋48向 财方突出。因此’可防止氧濃度感測器5〇亦於引擎^之前 後方向上凸出。進而’於引擎36中，由於汽門裝置％之前 端部相較排氣通路嫩於前方，因此，自^料之感測 器安裝面U2起至汽缸蓋上蓋48之前表面為止之汽缸轴線a 方向之距離充分變長。更具體而言，自突出部66之感測器 安裝面112起至汽虹蓋上蓋48之前表面為止之汽缸轴線入方 向之距離變得大於氧濃度感測器5〇中之自感測器安裝面 112露出之部分之長度。因&，連接於氧濃度感測器⑼之 電線m不會向引擎36之前方較大突出，從而可縮小電線 m之佈線所需之空間。再者，汽紅蓋46係僅突出部^之 部分向外側突出’但可相應地縮短安裝於汽缸蓋46之排氣 裝置56，因此引擎周邊之結構不會變大。 尤其於該實施形態之引擎36.中’自突出部“之感測器安 150169.doc •19- 201111618 裝面112起至汽缸蓋上蓋48之前表面為止之汽缸軸線a方向 之距離充分長’且，氧濃度感測㈣形成為其轴向之長度 大於半徑之柱狀。若為此種構成，則容易將氧濃度感測器 50以自汽缸軸線A方向觀察與突出部66重合之方式安裝於 汽缸蓋46，故而本發明尤為有效。 氧濃度感測器50係以使本體部丨丨8相較檢測部丨2〇位於更 刖方之方式安裝於突出部66。因此’可避開本體部US與 缸體44之空氣冷卻用之散熱片58或曲柄軸箱42干擾，故而 可將氧/農度感測If 5G不向左右方向凸出地容易安裝於汽虹 蓋46 。 、彳 氧濃度感測器5 0係以使中心軸線B平行於汽缸軸線a之 方式安裝於汽缸蓋46。藉此’可容易防止氧濃度感測器5〇 向左右方向及下方凸出。 突出部66係自蓋本體65至少向下方突出。因此，可有效 利用蓋本體65之下方之空間來設置突出部66。 突出部66係自汽缸轴線A方向觀察，自蓋本體65向斜下 方突出。藉此’可一面確保突出部66之長度，一面緊湊地 形成汽缸蓋46。 “ 氧濃度感測器50係以自汽缸軸線八方向觀察，相較蓋本 體叫向左右方向突出之方式配置。藉此，便可更準確防[Technical means for solving the problem] According to the present invention, a "fourth engine" will be provided, and a cylinder head including a cap body and a cover portion from the cover 5 and an evening dog; a combustion recess 'The cover body and the row two passages' are formed to penetrate the protrusion from the combustion recess to exhaust the exhaust gas from the combustion recess; and the oxygen concentration sensor 'includes the body portion and the detection portion provided on the body portion Detecting the oxygen concentration of the exhaust gas; and the oxygen concentration sensing system is mounted on the protruding portion such that the main body portion and the detecting portion overlap with the protruding portion and the at least part of the detecting portion is located in the exhaust passage when viewed from the direction of the cylinder axis . In the present invention, the "cylinder head" includes a cover body and a dog exit which protrudes outward from the cover body, and an exhaust passage is formed so as to penetrate the protruding portion. Further, the oxygen concentration sensor is attached to the protruding portion so that the main body portion and the detecting portion overlap with the protruding portion and the at least a portion of the detecting portion is positioned in the exhaust passage as viewed from the direction of the cylinder axis. Thereby, even if the oxygen concentration sensing H is provided at a position where the temperature of the exhaust gas is high, the oxygen concentration sensor can be prevented from protruding further toward the outside than the cylinder head. Therefore, the single-cylinder or v-type twin-cylinder engine does not impair the compactness of the left and right direction, thereby suppressing the size of the single-cylinder or v-type twin-cylinder engine. Further, the cylinder head is only partially protruded outward from the protruding portion, but since the exhaust device attached to the cylinder head can be shortened accordingly, the structure around the engine does not increase. Preferably, the oxygen 'time sensor is attached to the highlight p in such a manner that the body portion is located forward of the detecting portion. In this case, it is possible to eliminate the heat sink (fin) or the crankcase (the crankcase of the air cooling body of the main body and the red body), so that the oxygen concentration sensor can be easily mounted on the cylinder head and avoiding the left and right direction. Further, preferably, the oxygen concentration sensor is attached to the protruding portion such that the central axis of the oxygen concentration sensor is parallel to the cylinder axis. In this case, the oxygen concentration sensor can be easily prevented. Further preferably, the protruding portion protrudes at least downward from the cover body. In this case, the space below the cover body can be effectively utilized, and the protruding portion is provided. Preferably, the protruding portion is When viewed in the direction of the cylinder axis, the cover body protrudes obliquely downward. In this case, the cylinder head can be formed compactly while ensuring the length of the protruding portion. Further, preferably, the oxygen concentration sensor is oriented from the cylinder axis. Observed, it is disposed in such a manner that it does not protrude in the left-right direction compared to the cover body. In this case, the oxygen concentration sensor can be more accurately prevented from protruding toward the outer side of the cylinder head, thereby further suppressing the introduction. The size of the engine is preferably 'the dog's exit system includes the opening of the downstream end of the exhaust passage' and the center of the opening is viewed from the cylinder axis direction, compared to the cover 150169.doc 201111618 body 'in the left and right direction In this case, the protruding portion can be restrained from protruding toward the outer side of the cylinder head, so that the size of the engine can be further suppressed. Preferably, the outer peripheral surface of the cover body includes the cover body viewed from the direction of the cylinder axis. The concave portion is recessed on the inner side, and the protruding portion is formed in the concave portion. In this case, since the oxygen concentration sensor can be attached to the protruding portion in the vicinity of the concave portion, the protruding portion can be prevented from protruding toward the outer side of the cylinder head. Further, it is preferable that the recessed portion is recessed upward. In this case, the cylinder head is compactly formed while securing the length of the protruding portion provided in the recessed portion. Further preferably The recess is recessed to the side. In this case, the length of the projection provided in the recess can be broken, and the cylinder head can be formed compactly. Preferably, the recess is formed to cover The corner portion of the body is recessed. In this case, the cylinder head can be formed compactly while ensuring the length of the protruding portion provided in the recess. Further, preferably, the engine further includes a cylinder head cover provided in front of the cylinder head, And a sensor cover disposed on the cylinder head cover to cover at least the front side of the body portion. In this case, the oxygen concentration sensor may be covered by the protrusion portion and the sensor cover portion. Therefore, the engine is placed In the case of a straddle type vehicle, the oxygen concentration sensor can be appropriately protected from the sound of the road surface, etc. The 'oxygen concentration sensor is a way of observing the protrusion from the direction of the cylinder axis. Installed on the protrusion and located near the cylinder head, so the sensor cover does not become larger. 150169.doc 201111618 Jia Wei, bow! The engine includes the ι π cylinder 盍 ~ upper cover,, buckle & fly cylinder The cover system comprises a sensor mounting surface on which the upper cover of the cylinder head upper cover is mounted, and the sensor mounting surface of the protrusion portion & _ 3 women's aerobic concentration sensor, and the upper cover is guided, and the sensor mounting surface is formed as Parallel to each other. In this case, * can be machined to form the upper cover mounting surface and the sensor mounting surface. Miao, ★, the engine further includes an upper part of the cylinder head disposed in front of the cylinder head <,: the cylinder head includes a cover mounting surface on which the cylinder head upper cover is mounted, and the protrusion L糸 includes sensing with an oxygen concentration sensor installed Mounting surface, and the upper cover:: The sensor mounting surface is on the same plane. In this case, the upper cover mounting surface and the sensor mounting surface can be simultaneously formed by the processing, so that the cylinder head can be more easily obtained. Preferably, the engine further includes a cylinder head 2 disposed in front of the cylinder head and connected to the body portion and routed along the cover of the steam red cover. In this case, the wires can be arranged by 盥-+ Έ square 彳, κ /, / into the exhaust passage of the cylinder bore. Therefore, the effect of the heat generated by the exhaust heat of the milk discharge path is on the wire cylinder; therefore, the deterioration of the wire can be suppressed... The space can be reduced by arranging the wire along the steam: cover. It is preferred that the package is included in the seedling holding portion. In this case, it is possible to arrange the electric wires so as to keep the electric wires from being caught by the holding portion, and it is easy to arrange the electric wires along the upper and lower sides. Ά: The engine of the present invention prevents the oxygen concentration sensor from protruding, thereby suppressing the size of the engine. Therefore, if it is applied to an engine dust vehicle such as a locomotive such as a locomotive, the straddle-type vehicle can be prevented from becoming large. 150169.doc 201111618 Preferably, the cylinder axis is inclined obliquely upward toward the front. In this case, the engine is prevented from protruding downward. Therefore, such a configuration will be preferably used for a straddle type vehicle having an engine of a single cylinder or a v-type twin cylinder. In the present invention, the term "outer side" with respect to the steam red cap means a direction orthogonal to the cylinder axis and extending radially from the cylinder axis, and includes not only the right and left direction but also the up and down direction. * Further, "the body portion and the detecting portion overlap with the dog exit portion when viewed from the direction of the cylinder axis" means that the body portion and the detecting portion do not protrude from the contour of the protruding portion when viewed from the direction in which the cylinder is drawn. The above and other objects, features, aspects and advantages of the invention will be apparent from the following description of the embodiments of the invention. The position of the exhaust gas in the cylinder head is high. The sensor can also prevent the oxygen concentration sensor from coming out to the outside of the steam red cover. This can suppress the size of the engine. The embodiment of the present invention will be described. In the engine of the present invention, the direction of the crankshaft is defined as the right and left sides are positive 2 #❹^ meaning is the front-rear direction, and the crankshaft and the cylinder axis are: In the up and down direction, the state of the embodiment of the present invention is that the occupant of the Γ Γ 朝向 朝向 朝向 乘坐 乘坐 乘坐 乘坐 乘坐 乘坐 乘坐 乘坐 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮 壮The head system indicates the direction of the person 'F' indicates the front, the "Rr" indicates 150169.doc 201111618, the "U" indicates the top, the "Lo" indicates the bottom, the "R" indicates the right, and the "L" indicates the left. Fig. 1 is a left side view showing a so-called scooter type locomotive having an engine 36 according to an embodiment of the present invention. Referring to Figure 1, the locomotive 1 includes a body frame 12. A handlebar 14 and a front wheel 16 are respectively disposed above and below the front portion of the body frame 12. Above the rear portion of the body frame 12, a seat 18 for the rider is provided. Between the handlebar 14 and the seat 18, a foot rest 20 for the occupant to rest is provided along the body frame 12. The pedal 20 is formed so that the portion of the right foot of the occupant seated on the seat 18 and the portion of the left foot are placed at the same height. Thereby, a large space is formed between the handlebar 14 and the seat 18 and above the pedal 20. The body frame 12 is disposed to pass under the pedal 2〇. The body frame 12 includes one pair of right and left spaced frames 22 (see Fig. 3). The pair of frames 22 are provided with a predetermined interval in the left-right direction, and extend obliquely upward toward the rear. The pair of frames 22 support the power unit 26 via the link mechanism 24 to swing up and down. The link mechanism 24 includes a pivot shaft 28 that couples the pair of frames 22, and a link that connects the pivot shaft 28 and the power unit 26 and is swingable in the up and down direction about the pivot shaft 28 Member 3 〇. The power unit 26 is disposed below the seat 18, and the power unit 26 is coupled to the frame 22 by a rear shock absorber unit 32. A rear wheel 34 is disposed at a rear end of the power unit 26. 2 is a left side view showing the power unit 26, the rear wheel 34, and its vicinity. 150169.doc -11 - 201111618 Figure 3 is a graphical view of the body frame i2, the power unit %, the rear wheel 34 and its vicinity from the front of the cylinder axis A. The power unit 26 includes, for example, an air-cooled single-cylinder engine%, a transmission box that houses a power transmission device (not shown) including a speed changer or a speed reducer, etc. 38° when the locomotive 10 is side-viewed, the engine 36 is coupled to the vehicle. Frame 22 is handed over again. The engine tether includes crankshaft 40, crankcase 42, cylinder material, cylinder head 钧 and cylinder head cover 48» crank axle box 42, cylinder 44, cylinder head 粍 and cylinder head cover are attached from the rear of the vehicle The order of the squares facing forward is set on the cylinder axis of the engine %. The crankcase 42, the cylinder block 44, the cylinder head and the cylinder head upper jaw 48 are connected to adjacent members. As shown in Fig. 2 and Fig. 2, the cylinder axis is inclined obliquely upward in the front-rear direction with respect to the vehicle front and rear direction, and is slightly inclined. The crankcase 42 supports a crankshaft that extends in the left-right direction so as to be rotatable. As shown in Fig. 3, the right portion of the crankcase 42 is disposed behind the frame. Further, the power unit 26 does not interfere with the frame 22 and can swing in the vertical direction, and the cylinder 44, the cylinder head 46, and the cylinder head upper cover 48 are viewed from the direction of the cylinder axis A, and are disposed on the left and right frames. Between 22. The transmission case 38 is disposed behind the frame 22 and on the left side of the crankcase. The rear wheel 34 is rotatably mounted at the rear end of the transmission case 38. The rear wheel 34 is arranged in the vehicle with the transmission case 38. The width direction is disposed behind the engine 36. The driving force generated by the engine 36 is transmitted to the rear wheel 34 via the power transmission device. As described below, 'the cylinder head 46 is provided to detect the fuel ignited by the engine 36. Doc -12· 201111618 The waste chamber 90 (the combustion recess 7 of the cylinder head 46) is discharged from the deuterium concentration sensor 50, and the oil temperature sensor 52 for detecting the degree of flow in the engine. The cylinder head 46 <the upper surface of the cylinder is connected to supply the 54% of the combustion chamber via the intake passage 74 of the engine 36. At the lower portion of the cylinder head 46, the connection of the two ends of the cylinder is used to The exhaust unit 90 of the engine 36 exhausts the exhaust gas through the exhaust passage 8 $. The engine 36 will be described in detail with reference to Figs. 4 to 8. Fig. 4 is an observation engine 36 from the front of the steam red axis A. Graphical diagram. Figure % shows the right side view of the main part of the engine 36. Fig. 6 is a perspective view of a main portion of a schematic diagram of Fig. 7. Fig. 7 is a partial cross-sectional view taken along line w of Fig. 4. Fig. 8 is a cross-sectional view of the IMI line of Fig. 5. The cylinder block 44 is provided on the outer side thereof for air cooling. The heat sink 58 has a cylindrical cylinder bore 60 extending in the direction of the cylinder axis eight. Inside the cylinder bore 6 ,, a piston (PiSt〇n) 62 is reciprocally provided. The piston 62 is coupled to the crankshaft 40 via a connecting rod (c〇n 64). The cylinder axis A is the central axis of the cylinder bore (10). The flying rainbow cover 46 includes a weir body 65 and a projection. 66. The protruding portion is provided on the outer peripheral surface of the crucible body 65 and protrudes toward the outer side of the cap body 65. Referring to the drawing and Fig. 6, the outer peripheral surface of the disc main body 65 includes the crucible body 65 as viewed from the direction of the cylinder axis a. The curved recessed portion 68 of the inner recessed portion, that is, the recessed portion 68 is recessed upwardly from the lower surface 65a of the cover body 65. Further, the recessed portion is laterally sidewise (in this embodiment, the 'phase is opposite to the right side 65b of the cover body 65) And recessed to the left side. Further, the recess 68 is formed so that the corner portion 15 of the cover body 65 0169.doc 201111618 Depression. Further, t + ', the recess 68 is formed in the outer circumferential surface of the cover body 65 in a direction extending in the cylinder axis A direction. The p 66 is formed in the concave portion from the front of the cylinder axis A. μ. Observed from the front of the self-steam red axis A, the cover body is formed “toward the right I: the cylinder is two out. In addition, the oxygen concentration sensor 50 is observed in the direction of the line eight, compared with The cover body 65 is disposed so as not to protrude in the left-right direction. As shown in Fig. 7, after the cover body 65 included in the cylinder head 46, the combustion recess 70 is formed at the square end. The combustion recess 70 communicates with the upper surface of the cylinder head 46 by the intake passage 74. The face of the intake passage 74 facing the combustion recess 70 is CT A, 72 γ, and ρ is the intake port 76. The opening portion 78 to which the intake valve 102P is connected is opened through the exhaust port. The air port 82 of the exhaust passage 80 facing the combustion recess 7 is closed. An exhaust device 56 is connected to the opening portion 78 of the dog M6. The exhaust device 56 includes a convex u at its end, and the flange portion 84 is mounted by using a stud 6 and a nut 88. Referring to Fig. 4, when the engine % is viewed from the front of the cylinder axis A, the exhaust passage 8 formed in the cylinder 46 is formed in the vertical direction (the axis is orthogonal to the crank axis such as the axis A). The direction) extends obliquely downward. More specifically, when the engine 36 is viewed from the front of the axis A, the milk discharge passage 80 formed in the cylinder chamber is formed as a self-burning (burning recess % and exhaust port 82 to the right) The opening portion 78 of the protruding portion 66 which is the downstream end of the exhaust passage 80 is oriented in a direction inclined with respect to the vertical direction. Further, as a projection of the downstream end of the exhaust passage 80 The opening of 66. 150169.doc •14- 201111618 is oriented obliquely downward to the right. The center 79 of the 78 is viewed from the direction of the cylinder axis A, and is not located outside the cover body 65 in the left-right direction. Thus, the exhaust passage 80 is also formed in the protruding portion 66. The exhaust passage 8 is along the line The transmission member 98 disposed at the left side of the engine 36 and the rotating member 100 (described below) extend in a direction separating from each other. Further, the combustion chamber 9 is formed by a space surrounded by the cylinder bore 60 and the piston 62 and a combustion recess 7 In the engine 36, air is introduced into the combustion chamber 90 through the air suction device 54 and the intake passage 74. The exhaust gas is discharged from the combustion chamber 9 through the exhaust passage 8 and the exhaust device 56. 7. The engine 36 further includes a valve device 92, an intake valve (va) [ve) 94, and an exhaust valve 96. The valve device 92 includes a transmission member %, a rotating member 1 , and a cam shaft (cam Shaft) 1 The 〇 2' cam 104 and the arm members 1 〇 6 and 1 〇 8. The transmission member 98 includes, for example, a metal chain, and connects the crank shaft and the rotating member 100 to transmit the rotation of the crank shaft 40 to the rotating member 1 〇〇. The rotating member 1 includes, for example, a sprocket and is transmitted by the transmission member 98. The cam shaft 1〇2 is rotated by the rotating member 1〇〇, and the arm member 1G8 is swung by the cam iq4 provided on the cam shaft (10). Further, the intake valve 94 is by the arm. The rod member 1〇6 switches the intake port 76, and the exhaust valve 96 opens and closes the exhaust port 82 by the arm member i 〇 8. The cylinder head 46 includes a cover mounting surface U〇 on which the upper cover 48 is attached. As shown in FIGS. 4 to 6, for example, a plurality of (two in this embodiment) fastening members (1) such as screws are attached to the front surface of the steam cover upper cover 48, whereby the cylinder cover 46 is fixed to the top cover. By thus mounting the cylinder head cover 150169.doc 15 201111618 cover 48 to the upper cover mounting surface 110, the cylinder head 46 does not require the flange for the cylinder head cover mounting. Therefore, the oxygen concentration sensor 50 can be disposed in a manner extending in the cylinder axis A direction. As the fastening member 丨丨i, a common fastening member such as a stud bolt and a nut, or a rivet can be used. The protruding portion 66 includes a sensor mounting surface 112, and an oxygen concentration sensor 5 is mounted on the sensor mounting surface H2. The upper cover mounting surface 110 and the sensor mounting surface 12 are formed to be parallel to each other. It should be noted here that the oxygen concentration sensor 50 for detecting the oxygen concentration of the exhaust gas passing through the exhaust passage 8 is viewed in a direction from the cylinder axis eight, coincident with the projection 66 of the cylinder head 46, Mounted on the sensor mounting surface U2 of the protruding portion. The stomach "oxygen concentration sensor ^ is viewed from the direction of the cylinder axis eight, coincides with the protruding portion 66"" means the direction from the cylinder car by the line eight The oxygen concentration sensor 50 does not protrude from the outline of the projection 66 when viewed. As will be described below, the central axis B of the oxygen concentration sensor 50 may be parallel to the cylinder axis a or may be inclined with respect to the cylinder axis A. In the sensor mounting surface 112, parallel to the vapor red axis A, a mounting hole 114 is formed in communication with the exhaust passage 80. The mounting hole ι 4 includes an internal thread portion 116. The oxygen concentration sensor 50 includes a columnar body portion 18 and a cylindrical detecting portion 120 coaxial with the body portion m and disposed at the end of the body portion 118. The oxygen concentration sensor 50 is formed into a column shape in which the length of the glaze is larger than the radius. The main body portion 11 8 includes an external thread 】 3 "Saki, P. 122. In this embodiment, the diameter of the body portion 118 is not fixed, and the θ m soil varies depending on the position of the axial direction. 150169. Doc 16·201111618 The external thread portion 122 is screwed into the female screw portion 116 so that the oxygen concentration sensor 50 is attached to the protruding portion (5) so that the detecting portion 120 is inserted into the mounting hole 114 and faces the inside of the exhaust passage 80. The oxygen concentration sensor 50 observes the 'body portion m and the detecting portion 12' and the cylinder head privately from the direction of the steam axis A. The P 66 is heavy. The method is 'mounted on the protruding portion'. The oxygen concentration sensor 5 is attached to the protruding portion 66 along the concave portion 68. In other words, the columnar oxygen concentration sensor 50 is disposed along the direction in which the recess 68 extends. In the mounted state of the oxygen concentration sensor 50, the center draw line B of the oxygen concentration sensor 5q is parallel to the cylinder axis A, and at least a portion of the detecting portion 12 is located in the exhaust passage 80. A connector 125 of the electric wire 124 is connected to the other end of the main body portion 118. In this embodiment, the electric wires 124 are detachably attached to the main body portion 118. The detecting portion 12 of the oxygen concentration sensor 50 is configured to include, for example, a stabilized crucible, and thus can be accurately detected when the specific sensor activation temperature or higher. At least a part of the detecting portion 12 is located in the exhaust passage 8A through which the high-temperature exhaust gas flows. Therefore, the detecting portion 12 is heated by the exhaust gas. Therefore, the oxygen concentration sensor 50 can quickly reach the sensor activation temperature. Therefore, as the oxygen concentration sensor 50', a direct heat type sensor which does not require an additional heating means for heating the detecting portion 120 can be used, so that the oxygen concentration sensor 50 becomes small and the cost is lowered. The detection signal of the oxygen concentration sensor 50 is transmitted to the engine control unit 126 via the electric wire 124. The engine control unit 126 controls the air-fuel ratio of the fuel supplied to the combustion chamber 90 to an optimum state based on the transmitted detection signal '. Specifically, the engine control unit 126 drives a fuel injection valve 128 provided at 150169.doc -17- 201111618 of the air suction device 54, and injects fuel into the air supplied to the combustion chamber 9〇. Further, as shown in Fig. 4, Fig. 6, and Fig. 8, the cylinder head 46 includes a screw column portion 丨3 用 for oil temperature sensing installation on the side surface thereof. The screw column portion i 3 is formed on the upper side of the right side surface of the cylinder head 46. The screw post hole 132 of the screw post portion 13 is connected to the oil passage 134 formed inside the cylinder head 46. The oil passage 134 is formed to be parallel to the cylinder axis A. Further, a shaft seat portion 136 of the cam shaft 102 is formed in the cylinder head. The shaft seat portion 136 and the screw post hole 132 communicate with each other via the oil passage 138. Oil temperature sensing is attached to the screw column portion 13A. If the crankshaft 4〇 supported by the crankcase 42 rotates, the 'oil pump' will be driven via the idler gear in the crankcase 42. Thus, the oil will be formed from the oil pump through An oil passage of the crankcase 42 , an oil passage formed in a contact surface between the crankcase 42 and the cylinder 44 , an oil passage formed in the cylinder 44 , and an oil passage 134 formed in the cylinder head 46 are supplied to the camshaft 102 and The valve device 92. The 'oil oil is supplied from the oil pump to the crankshaft 4〇 and the oil cooler (oil(10)(4). Thus, in the circuit directly connected from the oil chestnut, the organic oil is always supplied during the rotation of the crankshaft 40. The oil temperature sensor 52 is disposed at a position close to the combustion chamber 9〇 and the oil always flows during the rotation process of the crankshaft. Therefore, during the rotation of the crankshaft (10), the H52 can be accurately sensed by the oil temperature. Stable detection of the burning room 9 The temperature, that is, the temperature of the engine 36. The detected value of the oil temperature sensor 52 is used to set or correct the fuel discharge amount. According to the cover, according to the locomotive 10 having such an engine 36, the steam red cover 46 is The surface of the outer peripheral surface of the main body 65 which is formed obliquely downward includes a protruding portion ", and 150169.doc • 18 - 201111618 is formed by the combustion chamber 90 extending obliquely downward toward the right through the protruding portion". The opening portion 78 of the downstream end of the protruding portion 66 is inclined obliquely downward to the right. Further, the body portion 118 and the detecting portion 120, which are viewed from the direction of the cylinder axis A, coincide with the protruding portion % and at least partially locate the detecting portion 120. The oxygen concentration sensor 5A is attached to the protruding portion 66 in such a manner that the exhaust gas is in the exhaust portion. Thereby, the oxygen concentration sensor is provided even at the position where the exhaust gas temperature is high, that is, the protruding portion 66 of the steam cover 5〇, it is also possible to prevent the oxygen concentration sensor 50 from protruding outward (especially in the left-right direction) compared to the cylinder head 46. - Therefore, the single-cylinder engine 36 can reduce the compactness in the left-right direction and suppress the engine of the single cylinder. 3 to 6. The oxygen concentration sensor 50 is not the same. Compared with the cylinder cover upper cover 48, it protrudes to the financial side. Therefore, it can prevent the oxygen concentration sensor 5 from protruding in the front and rear directions of the engine. Further, in the engine 36, since the front end portion of the valve device is relatively exhausted Since the passage is tender in front, the distance from the sensor mounting surface U2 of the material to the front surface of the cylinder head upper cover 48 is sufficiently long in the direction of the cylinder axis a. More specifically, the sensing from the projection 66 is performed. The distance from the mounting surface 112 of the device to the front surface of the front surface of the steam cover upper cover 48 becomes larger than the length of the portion of the oxygen concentration sensor 5 that is exposed from the sensor mounting surface 112. The wire m connected to the oxygen concentration sensor (9) does not protrude to the front of the engine 36, so that the space required for wiring of the wire m can be reduced. Further, the steam red cover 46 only protrudes outward from the portion of the protruding portion, but the exhaust device 56 attached to the cylinder head 46 can be shortened accordingly, so that the structure around the engine does not become large. In particular, in the engine 36 of the embodiment, the sensor self-protruding portion of the 'self-protruding portion' 150169.doc •19-201111618 is sufficiently long in the direction of the cylinder axis a from the surface 112 to the front surface of the cylinder head upper cover 48. The oxygen concentration sensing (4) is formed in a columnar shape whose axial length is larger than the radius. With such a configuration, the oxygen concentration sensor 50 is easily attached to the protruding portion 66 as viewed from the cylinder axis A direction. The present invention is particularly effective in the present invention. The oxygen concentration sensor 50 is attached to the protruding portion 66 such that the main body portion 8 is located further than the detecting portion 丨 2 。. Therefore, the body portion can be avoided. The US interferes with the air-cooling fins 58 or the crankcase 42 of the cylinder block 44, so that the oxygen/agro-sensitivity If 5G can be easily attached to the steam cover 46 without protruding in the left-right direction. The sensor 50 is attached to the cylinder head 46 such that the central axis B is parallel to the cylinder axis a. Thereby, the oxygen concentration sensor 5 can be easily prevented from protruding in the left-right direction and the downward direction. The cover body 65 protrudes at least downward. Therefore, there may be The protruding portion 66 is provided by the space below the cover body 65. The protruding portion 66 protrudes obliquely downward from the cap body 65 as viewed in the direction of the cylinder axis A. Thereby, the length of the protruding portion 66 can be ensured while being compact. The cylinder head 46 is formed in the ground. The oxygen concentration sensor 50 is disposed in the eight directions from the cylinder axis, and is disposed so as to protrude in the left-right direction from the cover body. With this, you can be more accurate
止氧濃度感測器50向汽缸蓋46之外側凸出，從而可進一步 抑制引擎36之尺寸。 V 突出部66係包括作為排氣通路8()之下游端之開口部冗， 且開口部78之中心79係自汽缸軸線A方向觀察，相較蓋本 150169.doc 201111618 體65，於左右方向上不位於外側。因此，可抑制突出部66 向汽缸蓋46之外側凸出，從而可進一步抑制引擎3 6之尺 寸。 汽缸盖本體6 5之外周面係包括自汽缸轴線a之方向觀 察，向盍本體65之内側凹陷之凹部68，突出部66係形成於 凹部68。如此般’便可在凹部68將氧濃度感測器5〇附近安 裝於突出部66 ’因此可抑制突出部66向汽缸蓋46之外側突 出。因此’可緊湊地形成汽缸蓋46。 凹部68係向上方及側方凹陷。又，凹部68係形成為使蓋 本體65之角部凹陷。因此，可一面確保設置於凹部68之突 出部66之長度，一面緊湊地形成汽缸蓋46。 上蓋女裝面11 〇與感測器安裝面112係以彼此平行之方式 形成藉此，便可易於藉由機械加工來形成上蓋安裝面 11〇與感測器安裝面112。 /L缸軸線A係朝前方斜著向上傾斜，因此可抑制引擎3 6 向下方之凸出。因此，此種構成係較佳用於具備單缸或v 型雙缸之引擎之跨坐型車輛。 再者上述實施形態係採用連桿機構2 4，但亦可無需設 置連桿機構24,而將動力單元26上下擺動自如地直接設置 於車體車架12。 傳輪構件98亦可包含例如橡膠製傳送帶。於該情形時， 旋轉構件90係為滑輪（puUe>〇。 圖9係自汽缸軸線a之前方觀察本發明之其他實施形態之 引擎36a之圖解圖。 150169.doc •21 - 201111618 於引擎36a中，使用包含電線12乜之氧濃度感測器5〇a來 代替氧濃度感測器50 ’使用電線124b來代替電線丨24，且 於汽缸蓋上蓋48形成有保持部14〇。其他構成因與圖4〜圖7 所示之引擎36相同，因此省略其重複之說明。 氧》辰度感測器5 0 a係於其本體部11 8 a之内部連接有電線 124a之如，且電線124a自本體部li8a拉出。電線i24a之 另一端係經由電線124b而連接於引擎控制裝置126。再 者，電線124a及124b分別包含連接器125a&125b。電線 124a與124b係藉由連接連接器i25a與125b而連接。 於汽缸蓋上蓋48之前表面設置有複數個（該實施形態中 為四個）保持部140。藉由該等保持部14〇，而保持連接於 氧濃度感測器50a之本體部丨丨8a之電線丨24a。保持部丨4〇即The oxygen concentration sensor 50 protrudes toward the outer side of the cylinder head 46, so that the size of the engine 36 can be further suppressed. The V projection 66 includes an opening portion as a downstream end of the exhaust passage 8 (), and the center 79 of the opening portion 78 is viewed from the cylinder axis A direction, compared to the cover 150169.doc 201111618 body 65, in the left and right direction It is not on the outside. Therefore, it is possible to suppress the projection 66 from protruding toward the outer side of the cylinder head 46, so that the size of the engine 36 can be further suppressed. The outer peripheral surface of the cylinder head body 65 includes a recess 68 which is recessed toward the inside of the crucible body 65 from the direction of the cylinder axis a, and the projection 66 is formed in the recess 68. Thus, the projection 66 can be attached to the projection 66 in the vicinity of the oxygen concentration sensor 5' in the recess 68. Therefore, the projection 66 can be prevented from protruding toward the outer side of the cylinder head 46. Therefore, the cylinder head 46 can be formed compactly. The recess 68 is recessed upward and laterally. Further, the recessed portion 68 is formed to recess the corner portion of the cover body 65. Therefore, the cylinder head 46 can be formed compactly while ensuring the length of the protruding portion 66 provided in the recessed portion 68. The upper cover female face 11 〇 and the sensor mounting face 112 are formed in parallel with each other, whereby the upper cover mounting face 11 〇 and the sensor mounting face 112 can be easily formed by machining. The /L cylinder axis A is inclined obliquely upward toward the front, so that the engine 36 can be prevented from protruding downward. Therefore, such a configuration is preferably used for a straddle type vehicle having an engine of a single cylinder or a v-type twin cylinder. Further, in the above embodiment, the link mechanism 24 is employed. However, the power unit 26 may be directly and vertically slidably disposed on the body frame 12 without providing the link mechanism 24. The transfer member 98 can also comprise, for example, a rubber conveyor belt. In this case, the rotating member 90 is a pulley (puUe > 〇. Fig. 9 is a schematic view of the engine 36a according to another embodiment of the present invention viewed from the front of the cylinder axis a. 150169.doc • 21 - 201111618 in the engine 36a Instead of the electric wire bundle 24, an oxygen concentration sensor 5A having a wire 12 is used instead of the oxygen concentration sensor 50', and a holding portion 14 is formed on the cylinder head upper cover 48. The engine 36 shown in Fig. 4 to Fig. 7 is the same, and therefore the description thereof will be omitted. The oxygen sensor 520 is connected to the inside of the main body portion 11 8 a wire 124a, and the wire 124a is self-connected. The main body portion li8a is pulled out. The other end of the electric wire i24a is connected to the engine control device 126 via the electric wire 124b. Further, the electric wires 124a and 124b respectively include connectors 125a & 125b. The electric wires 124a and 124b are connected by the connector i25a and A plurality of (four in this embodiment) holding portions 140 are provided on the surface of the cylinder head upper cover 48. The holding portion 14 is held to be connected to the body portion of the oxygen concentration sensor 50a.丨丨8a wire丨24a. Keep the unit 4丨
著气缸盍上蓋48之方式配置電線 150169.doc • •22· 201111618 124a ’而減小自引擎36a拉出之電線124a所需之空間。 又’可易於藉由使用保持部140來配置電線124a。 再者’保持部140亦可用於先前之實施形態中。於該情 形時’係藉由保持部14〇來保持連接於氧濃度感測器50之 電線124。 圖1 〇係表示安裝有空氣罩（air shroud)l42之引擎36之局 部省略右側視圖。 如圖10所示，亦可於圖4〜圖7所示之引擎36安裝空氣罩 142’並於空氣罩142之表面上形成保持部14〇，且藉由保 持部140來保持連接於氧濃度感測器5〇之電線124。進而， 保持部140亦可設置於汽缸蓋46。 圖11(a)係自汽缸軸線八之前方觀察形成有感測器蓋部 1 44之汽缸蓋上蓋48之主要部分及其附近之圖解圖，圖 11(b)係該圖11(a)之立體圖。 如圖11(a)及（b)所示，亦可於汽缸蓋上蓋48中之氧濃度 感測器50附近之角落部一體形成感測器蓋部144。 感測器蓋部144係包括覆蓋氧濃度感測器50之本體部丨18 之前方之蓋前部146、以及覆蓋本體部118之外側之一部分 之蓋側部148。於此，所謂本體部118之「外側」，係指與 氧濃度感測器50之中心軸線B正交且自中心轴線B放射狀 延伸之方向。 於將包含形成有此種感測器蓋部144之汽缸蓋上蓋“之 引擎36載置於機車1Q之情形時，可適當地保護氧濃度感測 器50免受路面碎石等之影響。又，氧濃度感測器⑼係以自 150l69.doc -23· 201111618 汽缸軸線A方向觀察與突出部66 $ Q之方式安裝於突出部 66，且位於紅缸蓋46之附 變大 U此’感測器蓋部144不會 觀察形成有感測器蓋部 及其附近之圖解圖，圖 圖12(a)係自汽缸軸線a之前方 144a之汽缸蓋上蓋48之主要部分 12(b)係該圖12(a)之立體圖。 如圖12⑷及(b)所示’亦可於汽缸蓋上蓋48中之氧濃度 感測器50附近之角落部，藉由例如螺釘等緊固構件而 安裝不同之感測器蓋部144a。感測器蓋部14鈍係包括覆蓋 氧濃度感測器50之本體部118之前方之蓋前部14“、以及 覆蓋本體部118之外側之一部分之蓋侧部M8a。 於該情形時，亦可獲得與使用包含形成有感測器蓋部 144之汽缸蓋上蓋48之引擎36之情形相同之效果。 再者，緊固構件150並不限定於螺釘，而可使用可緊固 之任意構件。又，為防止安裝於汽缸蓋上蓋48之感測器蓋 部144a進行旋轉，亦可將例如突起狀之防旋轉體（未圖示） 設置於汽缸蓋上蓋48。 於使用圖9所示之氧濃度感測器50a作為氧濃度感測器之 情形時，亦可將感測器蓋144、144a形成於汽缸蓋上蓋 48 ° 又’感測器蓋部144、144a以覆蓋氧濃度感測器50之本 體部118之至少前方之方式，分別包含蓋前部146、146a即 可。 圖13係表示本發明之其他實施形態之引擎36b之局部剖 150169.doc •24- 201111618 面圖解圖。 參照圖u，包含於引擎鳩之汽红蓋仏係安裂有汽缸蓋 上蓋48之上蓋安裝面11G、與安裝有氧濃度感測器5〇之感 測器安裝面U2a位於同一平面上。亦即，丨蓋安裝面ιι〇 與感測器安裝面112a係彼此形成於同—面。其他構成因與 圖7所示之引擎36相同，因此省略其重複之說明。 於該情形時，可藉由機械加工而同時形成上蓋安裝面 110與感測器安裝面112a，故而可更容易獲得汽缸蓋46a。 圖14係自π缸軸線a之前方觀察本發明之進而其他實施 形態之引擎36c之圖解圖。 圖14所示之引擎36c係使用包含突出部66a之汽缸蓋4仳 來代替包含突出部66之汽缸蓋46。 若自汽缸軸線A之前方觀察引擎36c，則突出部66a係自 汽此蓋46b向下方突出’且作為排氣通路8〇a之下游端之開 口部78a形成為朝向左斜下方。又，形成於汽缸蓋4讣之排 氣通路80a係形成為自燃燒室9〇及排氣口 82向下方延伸。 其他構成因與圖4所示之引擎36相同，因此省略其重複之 說明。 引擎36c亦可獲得與引擎36相同之效果。 圖15係表示使氧濃度感測器5〇傾斜地安裝於突出部66之 狀態之主要部分之圖解圖。圖丨6係圖15所示之ΙΙΙ-ΙΠ線剖 面圖解圖。 如圖15及圖16所示，氧濃度感測器50係亦可以其中心軸 線B相對汽缸軸線A傾斜之方式設置。為了與其進行對 150169.doc -25- 201111618 比，而以兩點鏈線表示以中心軸線B平行於汽缸軸線八之 方式設置之氧濃度感測器50。 自汽缸軸線A之方向觀察時，只要氧濃度感測器％之本 體部118及檢測部120與汽缸蓋46之突出部66重合，則中心 軸線B相對汽缸軸線A之傾斜角度可為任意角度。換言 之，參照圖16，於本體部118及檢測部12〇不自線c與線β 之間伸出之範圍内，氧濃度感測器5〇亦可以相對汽缸軸線 A傾斜之方式設置。線c係連接於突出部66之一端且平行 於汽缸軸線A之直線，線D係連接於突出部66之另一端且 平行於汽缸軸線A之直線。 再者，自π缸軸線A之方向觀察時，本體部丨丨8位於線〇 與線D之間即可，且連接於本體部118之電線124(124^亦 可自線C與線D之間伸出。 圖17(a)係表示本發明之其他實施形態之v型雙缸之引擎 36d之側面圖解圖，圖17(b)係自上方觀察引擎36d之圖解 圖。 於引擎36d中，氧濃度感測器5〇係分別安裝於各汽缸之 汽缸蓋46。再者’亦可僅於其中一個汽缸之汽缸蓋46上安 裝氧濃度感測器50，控制引擎36d。 如此般’本發明不僅可應用於單缸之引擎，而且亦可同 樣應用於複數個汽缸並非排列於左右方向之V型雙缸之引 擎。 圖18係表示本發明之其他實施形態之機車1〇&之左側視 圖0 150169.doc -26- 201111618 &機車1〇a係於車體車架152之下方設置有引擎36e之所謂 皆梁（underbone)型之機車。 參照圖18，機車1 〇a係包含車體車架丨52。車體車架^μ 係包括頭管154、主車架（main frame)156及座椅架（咖 frame)158。頭管1S4係設置於車體車架m之前端部之車寬 方向中心。主車架156係自頭管154在車寬方向中心朝後方 斜著向下L伸。座椅架158係自主車架156朝後方斜著向上 延伸。 前叉16〇係以可左右轉向之方式由頭管154支撐，前輪 162以可轉動之方式由前叉16〇之下端部支撐。於前又⑽ 之上端部安裝有轉向車把16 4。 空冷式單缸之引擎36e係使曲柄轴166朝向車寬方向，由 主車架156懸掛支樓。引擎36e係被固定於車體車架152而 不會晃動。由引擎36e之後端部’以可上下擺動之方式支 撐著後臂（rear _)168，由後臂168之 ⑺。於座椅⑽之上方設置有座椅172。車體車架^ 引擎36e之左右側方係由車罩i μ所覆蓋。 引擎36e係包括收納著曲柄軸166及變速機（未圖示）之曲 柄軸箱176、缸體44、汽缸蓋46及汽缸蓋上蓋48。缸體 44、汽缸蓋46及汽缸蓋上蓋48係與包含於引擎乂者相同。 曲柄軸箱m、缸體44、汽缸蓋46及汽叙蓋上蓋 車輛前後方向之後方朝向前方以該順序’設置於引擎he 之汽缸軸線A上。曲柄軸箱176、缸體44、汽缸蓋粍及、气缸 蓋上蓋48係與相鄰之構件連接。汽缸軸線A係相對車柄前 150169.doc -27- 201111618 後方向，朝則方斜著向上傾斜，於該實施形態中為略微傾 斜。於機車l〇a中，後輪17〇為鏈條驅動。 於汽缸蓋46之上表面，以與吸氣通路74連通之方式連接 有吸氣裝置178。又’與圖4所示之引擎％相同，於汽缸蓋 46之犬出部66，以與排氣通路8〇連通之方式連接有排氣裝 置56。 於具備引擎36e之機車1〇a中，亦可獲得與機車1〇相同之 效果。 再者，亦可將如引擎36a〜36d之引擎、如圖u及圖12所 示：附帶感測器蓋之汽缸蓋上蓋、如圖15及圖16所示之相 對汽缸軸線A傾斜之氧濃度感測器應用於機車10a。 於上述實施形態中，對於汽缸轴線A與車輛前後方向所 成之角度，並無特另,J限定。該角度亦可為零。亦即，汽缸 軸線A與車輛前後方向亦可―致。又，本發明係亦可應用 於沿著垂直方向或大致垂直方向設置有汽缸軸線A之引 擎。本發明之引擎亦可為水冷式。 氧濃度感測器50亦可以本體部118相較檢測部12〇位於後 方之方式，安裂於突出部66。於該情形時，本體部118之 前方及後方係分別由汽缸蓋46及曲柄軸箱42所覆蓋。於將 如此安裳有氧濃度感測器5G之引擎載置於機車之情形時， 可適當地保護氧濃度感測器50免受路面碎石等之影響。 又’包含於氧濃度感測器50之本體部118之直徑亦^成 為大：固冑：檢測部120之直徑亦可因軸向位置不同而不 同。氧濃度感測器50a之情況亦為相同。 150I69.doc •28- 201111618 用於本發明之氧濃度感測器亦可為直熱式或附帶加孰器 之任-種。於使用附帶加熱器類型之氧濃度感測器之情形 時，亦可抑制氧濃度感測器之耗電。 以沿著氧濃度感測器之方式形成於汽红蓋之外周面上之 凹口p ’並不限定於彎.曲狀。例如，凹部亦可為將汽虹蓋之 外周面角部沿著汽缸軸線方向切成V字狀者。 形成於π缸蓋之排氣通路之位置可相應於載置有引擎之 跨坐型車輛而適當設計。 較佳為，突出部自蓋本體至少向下方突出。例如，突出 部亦可自汽缸軸線方向觀察時，自蓋本體向右斜下方向、 下方或左斜下方之任一方向突出。 、於上述實施形態中，對本發明之引擎應用於圖i所示之 速可達型或圖18所示之彎梁型（水平汽缸型）之機車之情 形進订了祝明 '然而’本發明並不限定於此。本發明之 引擎亦可應用於例如機器腳踏車c 平汽缸型之機車…本 A寻亚非水 (snow m〇bUe)、全地形車輛（ALL terrain 仰扭 其他任意跨坐型車輛。 若本發明之引擎應用於跨坐型車輛，則即便於汽缸蓋中 廢氣溫度較高之位置處安裝氧濃度感測器，亦可抑制引擎 之尺寸，故而可抑制跨坐型車輛變大。 以上，對本發明之較佳實施形態進行了說明，但業者明 白只要不脫離本發明之範圍及精神，便可進行各種變更。 本發明之範圍係僅由隨附之申請專利範圍所限定。 150169.doc •29· 201111618 【圖式簡單說明】 圖1係表示本發明之—實施形態之機車之左側視圖； 圖2係表示動力單元、後輪及其附近之左側視圖； 圖3係自③缸軸線之前方觀察車體車架、動力單元、後 輪及其附近之圖解圖； 圖4係自汽缸軸線之前方觀察本發明之-實施形態之弓| 擎之圖解圖； 圖5係表示引擎之主要部分之右側_ ; 圖6係表示引擎之主要部分之立體圖； 圖7係圖4之I-Ι線局部剖面圖解圖； 圖8係圖5之Π-ΙΙ線剖面圖； 圖係自，飞紅軸線之月方觀察本發明之其他實施形態之 引擎之圖解圖； 圖 視圖 10係表示安裝有空氣罩之引擎之一例 的局部省略右側 圖u(a)係自汽缸軸線之前方觀察形成有感 缸蓋上蓋之一例之主要部分及其 圖1〗（a)之立體圖； 測器蓋部之 附近之圖解圖，圖11(b)係 圖12⑷係自汽缸軸線之前方觀察形成有感測器蓋 缸蓋上蓋之其他例之主要部分及其附近之圖解圖， 係圖12(a)之立體圖； 部之汽 圖 12(b) 圖13係表示本㈣之其他實施形態之^擎之 解圖； 面圖 圖14係自汽缸軸線之前方觀察本發明 之進而其他實施形 150169.doc 30· 201111618 態之引擎之圖解圖； 圖係表不使氧濃度感測器傾斜安裝於突出部之狀態之 主要部分之圖解圖； “ 圖16係圖15所示之III-III線剖面圖解圖； 圖17(a)係表示本發明之其他實施形態之v型雙缸之引擎 之側面圖解圖’圖17(b)係自上方觀察該引擎之圖解圖； 圖18係表示本發明之其他實施形態之機車之左側視圖. 圖19(a)及（b)係表示專利文獻丨之汽缸蓋之立體圖；及 圖20係表示專利文獻2之汽缸蓋之剖面圖。 【主要元件符號說明】 la、 lb ' 46、46a、46b 汽缸蓋 2a 隆起部 2b 空間 3a、 80 ' 80a 排氣通路 3b、 .82 排氣口 4a、 4b ' 50 、 50a 氧濃度感測器 5a 凸緣 6a、 130 螺絲枝部 10、 10a 機車 12、 152 車體車架 14 車把 16、 ‘162 前輪 18、 .172 座椅 20 腳踏 150169.doc -31 201111618 22 車架 24 連桿機構 26 動力單元 28 樞轴 30 連桿構件 32 後避震器單元 34、 170 後輪 36、 36a、36b、36c、36d、36e 引擎 38 傳動箱 40 ' 166 曲柄軸 42、 176 曲柄軸箱 44 缸體 48 汽缸蓋上蓋 52 油溫感測盗 54、 178 吸氣裝置 56 排氣裝置 58 散熱片 60 汽缸孔 62 活塞 64 連桿 65 蓋本體 65a 下表面 65b 右面 66 > 66a 突出部 150169.doc -32- 201111618 68 凹部 70 燃燒凹部 72 > 78 ' 78a 開口部 74 吸氣通路 76 吸氣口 79 開口部之中心 84 凸緣部 86 柱頭螺栓 88 螺母 90 燃燒室 92 汽門裝置 94 吸氣閥 96 排氣閥 98 傳輸構件 100 旋轉構件 102 凸輪軸 104 凸輪 106 ' 108 臂桿構件 110 上蓋安裝面 111 、150 緊固構件 112 、112a 感測器安裝面 114 安裝孔 116 内螺紋部 118 、118a 本體部 150169.doc -33- 201111618 120 檢測部 122 外螺紋部 124、124a、124b 電線 125、125a、125b 連接器 126 引擎控制裝置 128 燃料喷射閥 132 螺絲柱孔 134、138 機油通路 136 軸座部 140 保持部 142 空氣罩 144 、 144a 感測器蓋部 146、 146a 蓋前部 148 、 148a 蓋側部 154 頭管 156 主車架 158 座椅架 160 前叉 164 轉向車把 168 後臂 174 車罩 A 汽缸轴線 B 中心軸線 150169.doc -34-The wire 150169.doc • • 22· 201111618 124a ' is disposed in a manner that the cylinder 盍 upper cover 48 is provided to reduce the space required for the wire 124a pulled out from the engine 36a. Further, the electric wire 124a can be easily configured by using the holding portion 140. Further, the holding portion 140 can also be used in the previous embodiment. In this case, the electric wire 124 connected to the oxygen concentration sensor 50 is held by the holding portion 14A. Fig. 1 shows a side view of the engine 36 in which the air shroud l42 is mounted, omitting the right side view. As shown in FIG. 10, the air cover 142' may be attached to the engine 36 shown in FIG. 4 to FIG. 7, and the holding portion 14'' is formed on the surface of the air cover 142, and is kept connected to the oxygen concentration by the holding portion 140. The sensor 5 is connected to the wire 124. Further, the holding portion 140 may be provided in the cylinder head 46. Figure 11 (a) is a schematic view of the main portion of the cylinder head upper cover 48 on which the sensor cover portion 1 44 is formed and its vicinity as viewed from the front of the cylinder axis, and Figure 11 (b) is the view of Figure 11 (a) Stereo picture. As shown in Figs. 11(a) and (b), the sensor cover portion 144 may be integrally formed at a corner portion in the vicinity of the oxygen concentration sensor 50 in the cylinder head upper cover 48. The sensor cover portion 144 includes a cover front portion 146 that covers the front portion of the body portion 氧 18 of the oxygen concentration sensor 50, and a cover side portion 148 that covers a portion of the outer side of the body portion 118. Here, the "outer side" of the main body portion 118 means a direction orthogonal to the central axis B of the oxygen concentration sensor 50 and extending radially from the central axis B. When the engine 36 including the cylinder head cover "having such a sensor cover portion 144 is placed on the locomotive 1Q, the oxygen concentration sensor 50 can be appropriately protected from road debris or the like. The oxygen concentration sensor (9) is attached to the protruding portion 66 in such a manner as to be viewed from the direction of the cylinder axis A of 150l69.doc -23· 201111618, and is located at the protruding portion 66 of the red cylinder head 46. The detector cover portion 144 does not observe the graphical view in which the sensor cover portion and its vicinity are formed, and FIG. 12(a) is the main portion 12(b) of the cylinder head upper cover 48 from the front side 144a of the cylinder axis a. Fig. 12(a) is a perspective view. As shown in Figs. 12(4) and (b), the corner portion near the oxygen concentration sensor 50 in the cylinder head cover 48 may be mounted by a fastening member such as a screw. The sensor cover portion 144a. The sensor cover portion 14 includes a cover front portion 14" that covers the front side of the body portion 118 of the oxygen concentration sensor 50, and a cover side portion M8a that covers a portion of the outer side of the body portion 118. . In this case as well, the same effect as in the case of using the engine 36 including the cylinder head upper cover 48 on which the sensor cover portion 144 is formed can be obtained. Further, the fastening member 150 is not limited to the screw, and any member that can be fastened can be used. Further, in order to prevent the sensor cover portion 144a attached to the cylinder head upper cover 48 from rotating, for example, a projecting anti-rotation body (not shown) may be provided to the cylinder head upper cover 48. In the case where the oxygen concentration sensor 50a shown in FIG. 9 is used as the oxygen concentration sensor, the sensor covers 144, 144a may be formed on the cylinder head cover 48 and the 'sensor cover portions 144, 144a. The cover front portions 146, 146a may be included to cover at least the front side of the body portion 118 of the oxygen concentration sensor 50, respectively. Fig. 13 is a partial cross-sectional view showing an engine 36b according to another embodiment of the present invention, 150169.doc • 24-201111618. Referring to Fig. u, the cover plate mounting surface 11G of the cylinder head upper cover 48, which is included in the engine 鸠, is located on the same plane as the sensor mounting surface U2a to which the oxygen concentration sensor 5 is attached. That is, the flip cover mounting surface ιι and the sensor mounting surface 112a are formed on the same plane. The other configuration is the same as that of the engine 36 shown in Fig. 7, and therefore the description thereof will be omitted. In this case, the upper cover mounting surface 110 and the sensor mounting surface 112a can be simultaneously formed by machining, so that the cylinder head 46a can be more easily obtained. Fig. 14 is a view showing the engine 36c according to still another embodiment of the present invention from the front of the π-cylinder axis a. The engine 36c shown in Fig. 14 uses a cylinder head 4'' including a projection 66a instead of the cylinder head 46 including the projection 66. When the engine 36c is viewed from the front of the cylinder axis A, the projection 66a protrudes downward from the cover 46b, and the opening portion 78a which is the downstream end of the exhaust passage 8a is formed obliquely downward toward the left. Further, the exhaust passage 80a formed in the cylinder head 4 is formed to extend downward from the combustion chamber 9A and the exhaust port 82. The other configuration is the same as that of the engine 36 shown in Fig. 4, and therefore the description thereof will be omitted. The engine 36c can also achieve the same effect as the engine 36. Fig. 15 is a schematic view showing a main portion of a state in which the oxygen concentration sensor 5 is attached obliquely to the protruding portion 66. Fig. 6 is a diagram showing a cross-sectional view of the ΙΙΙ-ΙΠ line shown in Fig. 15. As shown in Figs. 15 and 16, the oxygen concentration sensor 50 may be provided such that its central axis B is inclined with respect to the cylinder axis A. In order to compare it with 150169.doc -25-201111618, the oxygen concentration sensor 50 is disposed with a two-point chain line in such a manner that the central axis B is parallel to the cylinder axis eight. When viewed from the direction of the cylinder axis A, as long as the body portion 118 and the detecting portion 120 of the oxygen concentration sensor % coincide with the protruding portion 66 of the cylinder head 46, the inclination angle of the center axis B with respect to the cylinder axis A can be any angle. In other words, referring to Fig. 16, in the range in which the main body portion 118 and the detecting portion 12 do not protrude from the line c and the line β, the oxygen concentration sensor 5A may be disposed to be inclined with respect to the cylinder axis A. The line c is connected to one end of the projection 66 and parallel to the cylinder axis A, and the line D is connected to the other end of the projection 66 and is parallel to the cylinder axis A. Furthermore, when viewed from the direction of the axis A of the π cylinder, the body portion 8 is located between the wire 〇 and the wire D, and the wire 124 connected to the body portion 118 (124^ may also be from the wire C and the wire D Fig. 17(a) is a side view showing a v-type twin-cylinder engine 36d according to another embodiment of the present invention, and Fig. 17(b) is a view showing the engine 36d from above. In the engine 36d, The oxygen concentration sensor 5 is respectively mounted on the cylinder head 46 of each cylinder. Further, the oxygen concentration sensor 50 may be mounted on the cylinder head 46 of one of the cylinders, and the engine 36d may be controlled. It can be applied not only to a single-cylinder engine but also to an engine in which a plurality of cylinders are not arranged in the left-right direction of the V-type twin-cylinder. Fig. 18 is a left side view showing the locomotive 1 〇 & 0 150169.doc -26- 201111618 & locomotive 1〇a is a so-called underbone type locomotive provided with an engine 36e below the body frame 152. Referring to Fig. 18, the locomotive 1 〇a system includes a vehicle body Frame 丨 52. The body frame ^μ includes a head tube 154, a main frame 156 and A seat frame 158. The head pipe 1S4 is disposed at the center of the vehicle width direction of the front end of the body frame m. The main frame 156 is inclined downward from the head pipe 154 toward the rear in the center of the vehicle width direction. The seat frame 158 is an upwardly inclined upwardly extending rearward of the autonomous frame 156. The front fork 16 is supported by the head pipe 154 in a left-right steering manner, and the front wheel 162 is rotatably supported by the lower end of the front fork 16 Support. A steering handlebar 16 4 is attached to the upper end of the front (10). The air-cooled single-cylinder engine 36e causes the crankshaft 166 to face the vehicle width direction, and the main frame 156 hangs the branch. The engine 36e is fixed to the vehicle. The body frame 152 does not sway. The rear end portion of the engine 36e supports the rear arm (rear_) 168 by swinging up and down, and the rear arm 168 (7). The seat 172 is disposed above the seat (10). The body frame ^ The left and right sides of the engine 36e are covered by the cover i μ. The engine 36e includes a crankcase 176, a cylinder 44, and a cylinder head that house the crankshaft 166 and a transmission (not shown). 46 and cylinder head cover 48. The cylinder block 44, the cylinder head 46 and the cylinder head cover 48 are connected to the engine. The crankcase m, the cylinder block 44, the cylinder head 46, and the steam cap cover are disposed in front of the vehicle in the front-rear direction in the order of 'on the cylinder axis A of the engine he. The crankcase 176, the cylinder 44, the cylinder head The cylinder head cover 48 is connected to the adjacent member. The cylinder axis A is inclined obliquely upward with respect to the rear direction of the front handle 150169.doc -27-201111618, which is slightly inclined in this embodiment. In the locomotive l〇a, the rear wheel 17 is driven by a chain. A suction device 178 is connected to the upper surface of the cylinder head 46 so as to communicate with the intake passage 74. Further, in the same manner as the engine % shown in Fig. 4, the venting means 56 is connected to the dog outlet portion 66 of the cylinder head 46 so as to communicate with the exhaust passage 8A. In the locomotive 1A having the engine 36e, the same effect as that of the locomotive 1 can be obtained. Furthermore, the engines such as the engines 36a to 36d, as shown in FIG. 9 and FIG. 12, the cylinder head cover with the sensor cover, and the oxygen concentration inclined with respect to the cylinder axis A as shown in FIGS. 15 and 16 The sensor is applied to the locomotive 10a. In the above embodiment, the angle formed by the cylinder axis A and the longitudinal direction of the vehicle is not particularly limited. This angle can also be zero. That is, the cylinder axis A and the vehicle front and rear direction can also be achieved. Further, the present invention is also applicable to an engine in which a cylinder axis A is disposed in a vertical direction or a substantially vertical direction. The engine of the present invention may also be water cooled. The oxygen concentration sensor 50 may also be ruptured to the protruding portion 66 in such a manner that the main body portion 118 is located rearward of the detecting portion 12A. In this case, the front and rear portions of the main body portion 118 are covered by the cylinder head 46 and the crank axle box 42, respectively. When the engine of the aerobic concentration sensor 5G is placed on the locomotive, the oxygen concentration sensor 50 can be appropriately protected from road debris or the like. Further, the diameter of the main body portion 118 included in the oxygen concentration sensor 50 is also large: the diameter of the detecting portion 120 may be different depending on the axial position. The case of the oxygen concentration sensor 50a is also the same. 150I69.doc • 28- 201111618 The oxygen concentration sensor used in the present invention may also be any type of direct heating or attached twister. In the case of using an oxygen concentration sensor with a heater type, the power consumption of the oxygen concentration sensor can also be suppressed. The notch p' formed on the outer peripheral surface of the vapor red cover along the oxygen concentration sensor is not limited to a curved shape. For example, the concave portion may be a shape in which the outer peripheral surface corner portion of the steam cap is cut into a V shape along the cylinder axis direction. The position of the exhaust passage formed in the π cylinder head can be appropriately designed in accordance with the straddle type vehicle on which the engine is placed. Preferably, the protruding portion protrudes at least downward from the cover body. For example, the protruding portion may protrude from the cover body in either the right oblique direction, the lower direction, or the left obliquely downward direction when viewed from the cylinder axis direction. In the above embodiment, the present invention is applied to the case where the engine of the present invention is applied to the speed-up type shown in FIG. 1 or the curved beam type (horizontal cylinder type) shown in FIG. It is not limited to this. The engine of the present invention can also be applied to a locomotive of a cylinder type c-cylinder type, for example, a snow m〇bUe, an all terrain vehicle (ALL terrain, any other straddle type vehicle. When the engine is applied to a straddle type vehicle, even if an oxygen concentration sensor is installed at a position where the exhaust gas temperature is high in the cylinder head, the size of the engine can be suppressed, so that the straddle type vehicle can be suppressed from becoming large. The present invention has been described with reference to the accompanying claims. The scope of the present invention is limited only by the scope of the accompanying claims. 150169.doc •29· 201111618 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a left side view of a locomotive according to an embodiment of the present invention; Fig. 2 is a left side view showing the power unit, the rear wheel and its vicinity; Fig. 3 is a view of the vehicle body from the front of the three cylinder axis Diagram of the frame, the power unit, the rear wheel and its vicinity; FIG. 4 is a schematic view of the bow of the present invention taken from the front of the cylinder axis; FIG. Figure 6 is a perspective view showing the main part of the engine; Figure 7 is a partial cross-sectional view of the I-Ι line of Figure 4; Figure 8 is a cross-sectional view of the Π-ΙΙ line of Figure 5; A schematic view of an engine of another embodiment of the present invention is observed on the moon of the red axis. Fig. 10 is a partial view of an engine with an air cover attached. The right side view u(a) is formed from the front of the cylinder axis. The main part of the upper cover of the cylinder head and its perspective view of Fig. 1 (a); the schematic view of the vicinity of the detector cover, Fig. 11 (b) is the view of Fig. 12 (4), the sensor cover is formed from the front of the cylinder axis. The main part of the other example of the upper cover of the cylinder head and the vicinity thereof are shown in a perspective view of Fig. 12(a); the steam diagram of the part 12(b) Fig. 13 is a diagram showing the other embodiment of the present invention; Figure 14 is a schematic view of the engine of the other embodiment of the present invention taken from the front of the cylinder axis 150169.doc 30·201111618 state; the diagram shows the main state of the state in which the oxygen concentration sensor is not tilted to the projection. Part of the diagram; "Figure 16 is Figure 15 Figure III (a) is a side view of the engine of the v-type twin-cylinder according to another embodiment of the present invention. Figure 17 (b) is a schematic view of the engine viewed from above; 18 is a left side view of a locomotive according to another embodiment of the present invention. Fig. 19 (a) and (b) are perspective views showing a cylinder head of the patent document ;; and Fig. 20 is a sectional view showing a cylinder head of Patent Document 2. [Description of main component symbols] la, lb ' 46, 46a, 46b Cylinder head 2a ridge 2b Space 3a, 80' 80a Exhaust passage 3b, .82 Exhaust port 4a, 4b ' 50 , 50a Oxygen concentration sensor 5a Flange 6a, 130 Screw branch 10, 10a Locomotive 12, 152 Body frame 14 Handlebar 16, '162 Front wheel 18, .172 Seat 20 Foot 150169.doc -31 201111618 22 Frame 24 Linkage mechanism 26 Power unit 28 Pivot 30 Link member 32 Rear shock absorber unit 34, 170 Rear wheel 36, 36a, 36b, 36c, 36d, 36e Engine 38 Gearbox 40' 166 Crankshaft 42, 176 Crank axlebox 44 Cylinder block 48 Cylinder head cover 52 oil Sensing theft 54, 178 Suction device 56 Exhaust device 58 Heat sink 60 Cylinder bore 62 Piston 64 Link 65 Cover body 65a Lower surface 65b Right 66 > 66a Projection 150169.doc -32- 201111618 68 Concave 70 Burning recess 72 > 78 ' 78a Opening 74 Intake passage 76 Suction port 79 Center of opening 84 Flange portion 86 Stud bolt 88 Nut 90 Combustion chamber 92 Valve device 94 Suction valve 96 Exhaust valve 98 Transmission member 100 Rotation Member 102 Camshaft 104 Cam 106' 108 Arm member 110 Upper cover mounting surface 111, 150 Fastening member 112, 112a Sensor mounting surface 114 Mounting hole 116 Internal thread portion 118, 118a Body portion 150169.doc -33- 201111618 120 Detection portion 122 external thread portion 124, 124a, 124b wire 125, 125a, 125b connector 126 engine control device 128 fuel injection valve 132 screw hole 134, 138 oil passage 136 shaft seat portion 140 holding portion 142 air cover 144, 144a Detector cover 146, 146a cover front 148, 148a cover side 154 head tube 156 main frame 158 Seat frame 160 Front fork 164 Steering handlebar 168 Rear arm 174 Car cover A Cylinder axis B Center axis 150169.doc -34-