TWI359229B

TWI359229B - Engine and vehicle

Info

Publication number: TWI359229B
Application number: TW097127255A
Authority: TW
Inventors: Naoki Onimura
Original assignee: Yamaha Motor Co Ltd
Priority date: 2007-08-31
Filing date: 2008-07-18
Publication date: 2012-03-01
Also published as: ATE519019T1; EP2031195B1; CN101377137B; TW200912123A; EP2031195A3; EP2031195A2; CN101377137A; JP2009057914A; ES2367461T3

Abstract

To provide a structure for determining a position of a rocker arm (412,413) that allows easy maintenance, an engine (100) has a cylinder head (113) in which a valve drive mechanism (400) is provided. The valve drive mechanism (400) includes rocker arm shafts (414,415) that are fitted to the cylinder head (113); rocker arms (412,413) that are fitted to the rocker arm shafts (414,415) so as to be moveable in the axial direction; and a head cover (114) (an upper arranging member) that is attached to the cylinder head (113). The head cover (114) is provided with guide members (731,732) that engage with the rocker arms (412,413), and guide the rocker arms (412,413) to determined positions on the rocker arm shafts (414,415) when the head cover (114) is attached to the cylinder head (113).

Description

1359229 九、發明說明：【發明所屬之技術領域】本發明係關於一種引擎，且更特定言之，係關於一種用於確定閥驅動機構之搖臂之位置的結構。【先前技術】用於確定閥驅動機構之搖臂之位置的結構係已知的，諸如JP-A-2006-348820中所描述之結構。在此文獻中，搖臂由設置於汽缸頭中之搖臂軸可搖動地支撐。另外，搖臂之1359229 IX. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to an engine and, more particularly, to a structure for determining the position of a rocker arm of a valve drive mechanism. [Prior Art] A structure for determining the position of the rocker arm of the valve drive mechanism is known, for example, as described in JP-A-2006-348820. In this document, the rocker arm is rockably supported by a rocker shaft disposed in the cylinder head. In addition, rocker arm

位置係藉由安裝於搖臂軸上之彈簧之彈性力來確定。此外，抵抗彈簧之彈性力而調節搖臂之移動的移動調節構件設置於汽缸頭蓋中。 [專利文獻 1 ] JP-A-2006-348820 【發明内容】 I本發明將解決之問題] 如亦在•雇2G中所描述的，在用於使用安裝於搖臂軸上之料之彈性力來確定㈣之位置的結構中，、引擎知作時的振動等可引起搖臂沿著搖臂軸移，行搖臂之維護工作之簡易性可受到負面地影響疋搖臂之位置之力由於彈簧負载増加而變大。a '' 此外，上述文獻描述了抵抗彈簀之移動的移動調節構件設置於汽缸頭蓋中的=調節搖臂之中’可在不使彈簧之強度如此大之情在此結構時的振動等引起的搖臂之移動。然 :广丨擎操作由彈一於―移a:之:: 133175.doc 在微小間隙〇因此，引寧 ^ ^ 引擎刼作時的振動等可引起搖臂在搖 #轴之軸向上振盪。若榣墼徭#振盪，則有可能將由於搖臂撞擊移動調節構件或其類似物而產生敲擊聲。構：：明提礅一種用於確定搖臂之位置之全新結構，該結構有助於維護。 [用於解決問題之方式] 之引擎具有具備閥驅動機構之汽缸頭。該閥動機構包括褒配至該汽虹頭之搖臂轴、裝配至該搖臂軸以便可在軸向上移動之搖壁β /徭#軸之上部配置構件。上㈣置禮2附接至汽缸頭之上部部分杜乂，上錢置構件具備導引構件，該導引構引二置=汽缸頭時與搖……臂導此外，導引構件可與搖臂鳴合，使得在上部配置構件已 :::一—持一之:定 [本發明之優點] 根據該引擎，冬4：τ 55 m 搖眢_ U碩盍附接至汽缸頭時’導引構件將搖臂導引至搖臂轴上之姑時，可外’當移除汽虹頭蓋 ’ 丨變搖’之位置，且因此易於維護。此外，當❹在上部配置構件已附接至汽 —在"—= 使引擎振動，亦可調節搖臂在搖臂軸之軸向上之移動，且可抑制異常噪音之產生。【實施方式】 133175.doc 1359229 在下文中，將參看諸圖式描述根據本發明之實施例之引擎。注意’在諸圖式中’具有相同功能之結構構件或部分用相同參考數字來表示’且在此基礎上給出說明。此外，本發明不限於以下實施例。在此實施例中，如圖2所示，引擎1〇〇包括汽缸頭113，閥驅動機構400設置於汽缸頭U3中。閥驅動機構4〇〇具備附接至汽缸頭113之搖臂轴414、415、裝配至搖臂軸414、 4 1 5以便能夠在軸向上移動之搖臂4 12、413，及附接至汽缸頭11 3之汽缸頭蓋11 4(上部配置構件）。汽缸頭蓋丨丨4具備導引構件731、732，導引構件731、732在汽缸頭蓋114附接至Ά缸頭113時與搖臂412、413响合，且將搖臂412、 413導引至搖臂軸414、415上之特定位置。在引擎100中，當汽缸頭蓋114附接至汽缸頭113時，導引構件731、732將搖臂412、413導引至搖臂軸414、415上之特定位置。此外，當移除汽缸頭蓋丨14時，有可能改變搖臂41 2、41 3之位置，且因此易於維護。接下來，將詳細地描述引擎100。該實施例之引擎100併入於（例如）如圖i中所展示之速克達摩托車1000(跨坐型車輛）之擺動型引擎單元1〇1内。引擎單元101具備單缸引擎100及亦用作擺動臂之傳動箱2〇〇。在此實施例中，傳動箱200容納v形皮帶型自動傳動裝置，且經由V形皮帶型自動傳動裝置將驅動力自引擎1〇〇傳動至後輪300。引擎1〇〇(如可自圖2所見）包括曲柄軸箱m、汽缸體 I33175.doc 1359229 112、汽缸頭113及汽缸頭蓋丨丨4。曲柄軸箱111與傳動箱200形成為整體單元且容納曲轴12卜活塞123經由連接桿122而連接至曲柄軸ΐ2ι。在此實把例中，π缸體112為鑄造組件，單缸丨24形成於其中。連接至曲柄軸121之活塞123容納於汽缸124中。汽缸頭113 附接至汽缸124之頭側處之開口。在此實施例令，如圖2及圖3所示，汽缸頭丨丨3在面對汽缸124之表面中具有凹座丨25。燃燒室形成於凹座125與活塞123之間》汽缸頭11 3具備向燃燒室開放之一對進氣口 126、127(圖2及圖3中僅展示一進氣口），及向燃燒室開放之單一排氣口 128。進氣口 126 (127)及排氣口 128(如圖3所示）包括各別閥座 126a (127a)及 128a、閥導 126b (127b)及 128b。閥座 126a (127a)、128a為用於擱置下文中所描述之進氣閥131 (132) 及排氣閥133之閥頭部分301 (302)、、303之構件。閥導126b (127b)、128b為導引進氣閥131 (132)及排氣閥133之構件，且藉由下文中所描述之進氣閥131 (132)及排氣閥133 之閥桿311 (3 12)及313插入穿過其中之插入孔而形成。此外，彈簀座126c (127c)及128c設置於閥導126b (127b)、 128b之外側開口之周邊中。下文中所描述之進氣閥131 (132)及排氣閥133之閥彈簧321 (322)、323搁置於彈簀座 126c (127c) 、 128c上。進氣閥131 (132)及排氣閥133分別具備閥頭部分301 (302)及 303、閥桿 311 (31 2)及 313、閥彈簧 321 (322)及 133175.doc 1359229 323，及閥扣件 33 1 (332)及 333。閥頭部分301至303為執行如裝配至每一口 126至128之閥座126a (127a)、128a之閥的功能的構件。閥桿31丨至313為支撐閥頭部分301至303之軸。每一閥131至133具有一結構：閥桿311至313自汽缸頭ι13之口 126至128中之一特定者插入閥導126b (127b)、128b中。當閥頭部分3〇1至303裝配抵罪閥座126a (127a)、128a時，閥桿311至313自閥導 126b (127b)、128b突出於汽缸頭in上方確定距離。閥彈簧321至323附接至突出至汽缸頭i丨3之外側之閥桿3丨丨至 313。閥彈簧321至323搁置於設置於汽缸頭113中之彈簧座 126c (127c)、128c上。此外，閥扣件331至333附接至閥桿 311至313之末端部分’其中閥彈簧321至323處於壓縮狀態中。閥彈簧32 1至3 23以壓縮狀態附接於閥扣件33 1至33 3與彈簧座 126c (127c)、128c之間。藉由閥彈簧321至323之彈性反作用力而將每一閥131至 1 33自汽缸頭113上推。在此狀態中，閥頭部分3〇丨至3〇3裝配至每一口 126至128之閥座126a (127a)、128a，且每一口 126至128閉合。若由於任何種類之外力而將閥桿311至313 向下推’則閥頭部分301至303與每一口 126至128之閥座 126a (127a)、128a分離開’且每一口 126至128打開。此外’當將閥桿311至313向下推之外力停止時，閥彈簧321 至323之彈性反作用力將閥扣件331至333向上推。因此，閥頭部分301至303擱置於每一口 126至128之閥座126a (127a)、128a上，且每一口 126至128再次閉合。 133175.doc •10· 1359229 在此實施例中，藉由下文中所描述之搖臂412、4丨3將閥桿311至313向下推。填隙片341 (342)、343附接至閥桿川至3 13之尖端部分，且調整每一填隙片341至343之厚度以便將搖臂412、413與閥桿311至313之間的空隙調整至適當值。接下來，將說明搖臂。在此實施例中，搖臂412、413使用滾輪搖臂（搖桿滾輪），其具備在接觸部分處與凸輪451、452接觸且減小與凸輪451、452之接觸阻力，藉此改良燃料效率之滾輪476 (486) 〇搖臂412、413设置於形成於汽缸頭113中之閥動機構室 600 中。汽缸頭113(如圖3所示）包括劃分開形成進氣口 126 〇27) 及排氣口（128)之部分的底部分割壁61〇。此外，如圖3至圖 5所示’閥動機構室600藉由突出至汽缸體112之相對側的四個外壁ό 11至6 1 4而形成於底部分割壁6 1 〇之外側。閥動機構室600圍繞孔中心線〇 1，孔中心線〇 1為汽缸124之中心線之延長。在此實施例中’藉由支樓壁61 5將閥動機構室600劃分成兩個子腔室。支撑壁615設置於彼此面對之第一外壁611與第二外壁612之間，且自閥動機構室6〇〇之底部分割壁610突出。支樓壁615之一側與第三外壁613鄰接。在此實施例中，閥動機構室600之開口末端由可附接且可移除之汽缸頭蓋114覆蓋。如可自圖3及圖4所見，上文所描述之閥131至133中之每 133l75.doc 11 1359229 一者的閥桿311至313突出至在第一外壁611與支撐壁615之間的第一腔室601中》又，如圖3所示，閥彈簧321至323及閥扣件331至333安置於第一腔室601中。圖3中所展示之進氣閥131 (132)及排氣閥133之閥導126b (127b)、128b在第一腔室601(其在第一外壁611與支撐壁 615之間，如圖4所示）中打開，且每一間131至133之闊桿 311、312、313突出至第一腔室601中。閥動機構室600容納閥驅動機構4〇〇，閥驅動機構4〇〇驅動進氣閥131、132及排氣閥133以使其打開及閉合。閥驅動機構400具備凸輪軸411、用於進氣用途之第一搖臂 412、用於排氣用途之第二搖臂413、軸向地支撐第一搖臂 412之第一搖臂軸414’及轴向地支撐第二搖臂413之第二搖臂軸415。凸輪軸411(如圖5所示）經由各別軸承421、422而由汽缸頭113之第一外壁611及支撐壁615支撐。注意，為了使該圖更易於理解，圖5中省略了搖臂412、413及搖臂軸414、 415 ° 凸輪軸4 11經提供以相對於孔中心線〇〗成直角延伸。凸輪轴411(如圖4所示）穿過支撐壁615且突出至在汽缸頭113 之支撐壁615與第二外壁612之間的第二腔室6〇2中。鏈輪 423附接至該突出部分。鍵條424懸掛於鏈輪斗^與曲柄轴 1 2 1 (參看圖2)之間。鏈條424用以將旋轉驅動力輸入至凸輪抽411，且使凸輪軸411以一旋轉速度旋轉，該旋轉速度與曲柄軸121之旋轉對齊且為曲柄軸121之速度的一半。 133175.doc •12· a如可自圖3及圖5所見，凸輪軸“丨具備進氣凸輪451及排氣凸輪452 »進氣凸輪451及排氣凸輪452設置於在軸向上遠離凸輪軸411確定距離之位置處以便分別與用於進氣用途之第一搖臂412及用於排氣用途之第二搖臂413對應。注思，在此實施例中，供油通道453形成於凸輪軸411中，且將潤滑油供應至進氣凸輪45丨及排氣凸輪452之凸輪表面。接下來’將說明搖臂412、413。軸向地支撐第一搖臂412之第一搖臂軸414及軸向地支撐第一搖臂413之第二搖臂軸415(如圖3所示）平行於凸輪軸 411而配置於自凸輪軸411對角移位至上側之位置處。更具體s之，第一搖臂軸414及第二搖臂軸415(如圖4所示）具有裝配至設置於閥動機構室6〇〇側的汽缸頭i 13之第一外壁 611中的轴承構件461、462的一末端，及裝配至穿過支撐壁61 5之軸承孔463、464之另一末端。用於進氣用途之第一搖臂412具備圓柱形突起構件471、滾輪支撐構件472，及一對臂構件473、474。第一搖臂軸 414插入穿過其中之軸承孔475形成於突起構件471中，且第一搖臂軸414插入軸承孔475中以使得其可在軸向及圓周方向上滑動。滾輪支撐構件472在凸輪軸411之向上方向上自突起構件 471之外周邊表面延伸，且可旋轉地支撐滾輪476。滾輪 476(如圖3所不）與凸輪軸411之進氣凸輪451之外周邊表面 (凸輪輪廓）滾動接觸。另一方面，第一搖臂4丨2之臂構件473、474(如圖4所示） I33175.doc -13- 1359229 自突起構件471之外周邊表面朝著滾輪支撐構件472之相對側突出。臂構件473、474分成兩個分支，且臂構件473、 474之尖端遠離且面對設置於汽缸頭丨13中之兩個進氣閥 13 1 (132)之閥桿3 11、3 12的尖端而定位。臂構件473、474 之尖端（如圖3所示）具備擠壓各別進氣閥13ι、ι32之閥桿 311 (312)之頭部的擠壓部分477、478。用於排氣用途之第二搖臂413具備圓柱形突起構件481、滾輪支撐構件482，及臂構件483。第二搖臂軸415插入穿過其中之軸承孔485形成於突起構件481中，且第二搖臂軸 415插入穿過軸承孔485以使得其可在軸向及圓周方向上滑動。滾輪支撐構件482自突起構件48 1之外周邊表面突出，且可旋轉地支撐滾輪486。滾輪486(如圖3所示）與凸輪軸411 之進氣凸輪451之外周邊表面（凸輪輪廓）滾動接觸。另一方面，第二搖臂413之臂構件483自突起構件481之外周邊表面朝著滾輪支撐構件482之相對側突出。臂構件483之尖端具備擠壓排氣閥133之閥桿3U至313之尖端的擠壓部分 487 ° 在此實施例中，如可自圖3及圖4所見，具有特定厚度之填隙片341至343附接至閥桿3 11至3 13中之每一者的上部部仝。調整填隙片341至343之厚度以將搖臂412、413與閥桿至3 13之間的空隙調整至適當值。在相對於閥桿3 11至 3 13之頭部之位置移位搖臂412、4丨3的情況下執行此操作如圖6及圖7所；^。以此方式，自使閥驅動機構伽之 133175.doc 14 1359229 調整及維護更容易的觀點看，較佳可相對於閥桿311至313 之頭部之位置容易地移位搖臂412、413。此外，自允許閥驅動機構400正常地起作用之觀點看，採納一結構：確定搖臂412、413在搖臂軸414、415上之位置在適當位置處，在該適當位置處，搖臂412' 413定位於相對於閥桿311至 313之特定位置處。在此實施例中’第一搖臂41 2之突起構件47 1由第一搖臂軸414支樓以使得其可在轴向上滑動。更具體言之，第一搖臂41 2(如圖4所示）在第一搖臂軸414之軸向上在第一位置與第一位置之間滑動。在第一位置處，臂構件473 (474)之擠壓構件477 (478)面對閥桿311 (312)之尖端，且在第二位置處，如圖6所示，臂構件473 (474)之擠壓構件477 (478) 自閥桿311 (31 2)之尖端偏移至侧面。另一方面’第二搖臂413之突起構件481由第二搖臂軸 415支撐以使得其可在軸向上滑動。更具體言之，第二搖臂413 (如圖3所示）在第二搖臂軸415之軸向上在第一位置與第二位置之間滑動》在第一位置處，臂構件483之擠壓構件487面對閥桿313之尖端，且在第二位置處，如圖7所示’臂構件483之擠壓構件487自閥桿313之尖端移位至側面。在此實施例中，如圖4所示，在各別第一位置處，第_ 搖臂412鄰接設置於閥動機構室600侧處之第一外壁611中的軸承構件461，且第二搖臂413鄰接支撐臂615。此外’臂構件473、474、483中之每一者之擠壓構件 133175.doc •15- 1359229 477、478、487的位置經確定以使得其分別面對各別閥桿 3 11至3 13之尖端。此時，當朝著該等各別位置之移動發生時，第一搖臂412及第二搖臂413在轴向上於相對方向上在各別第一搖臂軸414及第二搖臂軸415上移動。此外，在此實施例中，墊圈501、502(環形構件）裝配至搖臂軸414' 415中之每一者。墊圈501 ' 502裝配在自第一位置偏離之侧（第二位置側），在第一位置處，各別搖臂 412、413之臂構件473、474、483之擠壓構件477、478、 487面對閥样311至313之尖端。在此實施例中’如上所述，在附接閥驅動機構4〇〇之後’如圖5所示，將板491附接至閥動機構室6〇〇之第一腔室601之上部部分。如圖4所示，通孔603形成於支撲壁615 及第一外壁611之上側部分中。板491 (如圖5所示）藉由將螺母604旋擰至自通孔603突出之柱螺栓（諸圖中未展示）之末端而附接。板491(如圖8所示）延伸且固持於汽缸頭us之外壁611與支撐壁615之間，且提供用於閥動機構室6〇〇之第一腔室60 1之頂板部分的加強。又，板491具有開放中心部分。上文所描述之搖臂412、413及搖臂軸414、41 5經由開口 492而曝露。在此實施例中’汽缸頭蓋114亦附接至汽紅頭113之頂板部分。更特定言之，汽缸頭蓋114(如圖3所示）為經附接以覆蓋汽缸頭11 3之構件。在此實施例中，上文所描述的汽缸頭 113之閥動機構室600由汽缸頭蓋114覆蓋。汽缸頭蓋 133175.doc 16- 1359229 114(如圖9所示）具有可覆蓋汽缸頭113之閥動機構室6〇〇的頂板部分之開口的形狀，且螺栓孔701形成於與形成於外壁611至614及支撐壁615中之螺栓孔6〇5(參看圖4)對應之位置處。此外，在此實施例中，汽缸頭蓋丨14(如圖9所示）包括在汽缸頭蓋114附接至汽缸頭113之方向上突出的銷711。孔 712(設置於汽缸頭蓋114中之銷711裝配至該孔中）形成於汽缸頭113之閥動機構室之外壁的上側部分中，如圖4及圖8 所示。在此實施例中，銷711設置於汽缸頭蓋114中之兩個位置處，且對應於銷711之孔形成於汽缸頭丨丨3中。銷7 j i 及孔712確定汽缸頭蓋114附接至汽缸頭113時之附接方向。此外，由於提供銷711及孔712，所以附接汽缸頭蓋 114時之氣度彳于以減小，因此減小汽红頭蓋丨14之附接誤差。注意’在此實施例中’銷711設置於汽缸頭蓋114中，且孔712形成於汽缸頭1丨3中。然而，以下為足夠的：銷7 ^】設置於該等構件（亦即，汽缸頭蓋114及汽缸頭113)中之一者中，且孔設置於另一構件中。因此，雖然諸圖中未展示，但該等銷可設置於汽缸頭113中，且該等孔（設置於汽缸頭113中之該等銷裝配至該等孔中）可形成於汽缸頭蓋 114 中。此外，在此實施例中，如可自圖3及圖5所見，密封件 721附接至汽缸頭蓋114。更特定言之，如圖9所示，密封件721裝配至形成於汽缸頭蓋i 14之内側表面中之凹槽722 133175.doc •17· 1359229 中。凹槽722形成於鄰接汽缸頭113之上側部分之部分中。密封件721為具有裝配至凹槽722中之形狀之環形密封件。汽缸頭蓋114(如圖3及圖5所示）附接至汽缸頭113之上側部分，其中密封件721裝配至凹槽722中。密封件721在汽缸頭113之上側部分之整個圓周周圍提供氣密密封，且抑制外來物質進入汽缸頭113之閥動機構室600中。在此實施例中，搖臂4 1 2、4 1 3中之每一者藉由設置於汽缸頭113之上部部分中之汽缸頭蓋丨M而導引至搖臂軸 414、415甲之每一者上的特定位置。更特定言之，汽缸頭蓋114(如圖9所示）具備導引構件731、732。導引構件731、 732在執行附接至汽缸頭113時與搖臂412、413嚙合，且將搖臂412、413導引至搖臂軸414、415上之特定位置。在此實施例中，導引構件731、732(如圖3及圖5所示）為在汽缸頭蓋114附接至汽缸頭113之方向上突出的突起。更特定言之，導引構件731、732分別自汽缸頭蓋114之内侧朝著設置於閥動機構室6〇〇中之第一搖臂412及第二搖臂 413所安置之位置突出。在此實施例中，導引構件731、732(如圖9及圖所示）包括具有與搖臂軸414、415之外周邊表面對應之圓弧形狀的凹座733、734。當汽缸頭蓋114附接至汽缸頭113時，如圖3所不，第一搖臂軸414及第二搖臂軸415裝配於凹座 733、73 4 1 j ^ 、 T。又’在此實施例中，導引構件731、732朝著該對平行的搖臂轴414、415之外側延伸。傾斜表面川、 736設置於導弓丨構件73卜732之尖端處。 133175.doc 1359229 在此實施例中’充當導引構件731、732之突起設置於偏離搖臂軸414上之特定位置（第一位置）（當汽缸頭蓋U4附接至Ά缸頭113時’搖臂412、413經導引至該特定位置）之位置處。此外’傾斜表面735、736之法線朝著第一位置定向’該等第一位置確定搖臂412、413在榣臂軸414、415上之位置。更特定言之’導引第一搖臂412之第一導引構件731設置於第一搖臂軸414上，如圖9及圖11所示，在偏離第一位置 (在第一位置處，第一搖臂412之擠壓構件477 (478)面對閥才干311 (31 2)之尖端）朝著第二位置之位置處β第一導引構件731之傾斜表面735之法線hi相對於汽缸頭蓋ι14附接至 Ά紅頭113之方向朝著第一位置定向，該第一位置確定第一搖臂412在第一搖臂軸414上之位置。此外，導引第二搖臂413之第二導引構件732設置於第二搖臂軸415上，如圖9及圖12所示，在偏離第一位置（在第一位置處，第二搖臂413之擠壓構件487面對閥桿313之尖端）朝著第二位置之位置處。第二導引構件732之傾斜表面 73 6之法線h2相對於汽缸頭蓋114附接至汽红頭1丨3之方向朝著第一位置定向，該第一位置確定第二搖臂413在第二搖臂軸415上之位置。在此實施例中’當汽缸頭蓋114附接至汽缸頭113時，導引構件731、732之傾斜表面735、736鄰接（參看圖8)裝配至搖臂軸414 ' 415之墊圈501、502。又，當汽缸頭蓋114附接至汽缸頭113時，搖臂412、41 3沿著搖臂軸414、41 5朝 U3175.doc •19· 1359229 。一旦汽缸頭蓋、732之側表面、413固持在搖臂著上文所描述的所確定之第一位置移動 114附接至汽缸頭〗13，則導引構件73ι 737、738鄰接墊圈501、502，且搖臂412 軸414、415上之第一位置處。此外，在此實施例中，如圖9所示，汽缸頭蓋114具備阻擋構件741、742，阻擋構件741、742在汽缸頭蓋114附接至汽缸頭113且墊圈501、502相對於導引構件731、732在與搖臂軸414、415上之第一位置之相對側處裝入時阻擋墊圈501、502。在此實施例中，導引構件731、732在搖臂軸 414、415之第一位置之相對側上具備肋狀物741、742，且肋狀物74 1、742充當上文所描述之阻擋構件。當汽缸頭蓋114附接至汽缸頭113時，若墊圈5〇1、5〇2相對於導引構件731、732在與搖臂軸414、415之第一位置之相對側處裝入，則肋狀物741、742阻擋墊圈5〇 1、502以使知·不可將汽缸頭蓋114附接至汽缸頭丨丨3。因此，可抑制由於執行組裝等之工人之疏忽而引起的錯誤，且可較有把握地準確確定榣臂412、413之位置。此外，在此實施例中，如圖4所示，該對搖臂軸414、 4 1 5平行地配置於汽缸頭u 3中。此外，搖臂4丨2、4丨3分別裝配至搖臂軸414、415。又，第一搖臂412及第二搖臂413 經建構以使得當臂構件473、474、483之擠壓構件477、 478' 487(參看圖3)分別朝著面對閥桿311、312、313之尖端之特定位置移動時，第一搖臂412及第二搖臂413分別在第搖’轴414及第二搖臂軸415之軸向上在相對方向上移 •33175.doc 1359229 動。如圖9所示’導引第一搖臂412之導引構件731及導引第二搖臂413之導引構件732分別設置於汽缸頭蓋114中。當汽缸頭蓋114附接至汽缸頭113時，導引樽件731、732引起裝配至該對搖臂轴414、415之搖臂412、413在相反方向上移動。因此，當汽缸頭蓋114附接至汽缸頭113時，可達成相對於移動搖臂412、413所必需之力的偏移效應。因此，附接汽缸頭蓋114所必需之力得以減小。此外，在此實施例中’導引構件73 1、732(如上所述）朝著汽缸頭蓋Π4之内側突出。凹座在形成導引構件73 1、 732之部分處形成於汽紅頭蓋114之外側，且因此改良可鍛性並促進重量減小。以此方式，汽缸頭蓋114具備導引構件731、732，導引構件731、732在汽缸頭蓋！ 14附接至汽缸頭113時與搖臂 412、413嚙合，且將搖臂412、413導引至搖臂軸414、415 上之特定位置（第一位置）。在引擎1 00中，當汽缸頭蓋114附接至汽缸頭11 3時，由於設有導引構件73 1、732 ’所以搖臂412、413經導弓丨至搖臂軸414、41 5上之特定位置（第一位置）^此外，當移除汽缸頭蓋114時’可改變搖臂412、413之位置。此外’在此實施例中，不使用如jp_A_2〇〇6_34882〇中所描述之技術中的將搖臂412、413推動至搖臂軸414、415上之特定位置之彈簧。因此，當移除汽缸頭蓋114時，可容 133175.doc 21 1359229 易地改變搖臂412、413之位置作。又’在此實施例中，-旦汽缸頭蓋114附接至汽缸頭ιΐ3 之上部部分，導引構件731、732即與搖臂412、413喃人且將搖臂412、413固持在搖臂抽414、415上之特定位置處。因此，即使引擎1〇〇振動，亦可調節搖臂M2、413在搖臂軸之軸向上之移動，且可抑制異常噪音之產生。The position is determined by the spring force of the spring mounted on the rocker shaft. Further, a movement regulating member that adjusts the movement of the rocker arm against the elastic force of the spring is provided in the cylinder head cover. [Patent Document 1] JP-A-2006-348820 [Disclosure] The problem to be solved by the present invention is as described in the employment of 2G, in the elastic force for using a material mounted on a rocker shaft. In the structure to determine the position of (4), the vibration of the engine when the engine is known can cause the rocker arm to move along the axis of the rocker arm, and the ease of maintenance of the rocker arm can be negatively affected by the force of the rocker arm. The spring load increases and becomes larger. a '' In addition, the above document describes that the movement regulating member that resists the movement of the magazine is disposed in the cylinder head cover = the adjustment rocker arm can be caused by the vibration of the structure without causing the strength of the spring to be so large. The movement of the rocker arm. However: the operation of the 丨丨由由 ― ― ― ― 移移移移移 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 133 If 榣徭徭# oscillates, it is possible to generate a knocking sound due to the rocker arm striking the movement regulating member or the like. Structure: A new structure for determining the position of the rocker arm that contributes to maintenance. The engine used to solve the problem has a cylinder head having a valve drive mechanism. The valve mechanism includes an upper configuration member that is coupled to the rocker shaft of the steam head, and is mounted to the rocker shaft so as to be axially movable. The upper (four) gift 2 is attached to the cuckoo part of the upper part of the cylinder head, and the upper part of the money is provided with a guiding member, the guiding structure is two-position = the cylinder head and the shaking... the arm guiding is further, the guiding member can be shaken The arm is combined so that the upper configuration member has been ::: one-hold one: fixed [the advantages of the present invention] According to the engine, winter 4: τ 55 m shake _ U Shuo 盍 attached to the cylinder head When the guiding member guides the rocker arm to the rocker arm shaft, it can be externally 'when the steam head cover is removed', and it is easy to maintain. Further, when the upper member is attached to the steam in the upper portion - the engine is vibrated in the "-=, the movement of the rocker arm in the axial direction of the rocker shaft can be adjusted, and abnormal noise can be suppressed. [Embodiment] 133175.doc 1359229 Hereinafter, an engine according to an embodiment of the present invention will be described with reference to the drawings. Note that structural members or portions having the same functions in the drawings are denoted by the same reference numerals and the description is given on the basis of the same. Further, the present invention is not limited to the following embodiments. In this embodiment, as shown in FIG. 2, the engine 1A includes a cylinder head 113, and the valve drive mechanism 400 is disposed in the cylinder head U3. The valve drive mechanism 4A has a rocker shaft 414, 415 attached to the cylinder head 113, a rocker arm 4 12, 413 assembled to the rocker shaft 414, 4 1 5 so as to be movable in the axial direction, and attached to the cylinder The head cap 11 4 of the head 11 3 (upper arrangement member). The cylinder head cover 4 is provided with guiding members 731, 732 that converge with the rocker arms 412, 413 when the cylinder head cover 114 is attached to the cylinder head 113, and guide the rocker arms 412, 413 to A specific position on the rocker shafts 414, 415. In the engine 100, when the cylinder head cover 114 is attached to the cylinder head 113, the guide members 731, 732 guide the rocker arms 412, 413 to specific positions on the rocker shafts 414, 415. Further, when the cylinder head cover 移除 14 is removed, it is possible to change the positions of the rocker arms 41 2, 41 3 and thus it is easy to maintain. Next, the engine 100 will be described in detail. The engine 100 of this embodiment is incorporated, for example, in a swing type engine unit 101 of a speed motorcycle 1000 (a straddle type vehicle) as shown in Fig. i. The engine unit 101 is provided with a single cylinder engine 100 and a transmission case 2 that also functions as a swing arm. In this embodiment, the transmission case 200 accommodates a v-belt type automatic transmission, and the driving force is transmitted from the engine 1 to the rear wheel 300 via a V-belt type automatic transmission. The engine 1 (as can be seen from Figure 2) includes a crankcase m, a cylinder block I33175.doc 1359229 112, a cylinder head 113 and a cylinder head cover 丨丨4. The crankcase 111 and the transmission case 200 are formed as an integral unit and accommodate the crankshaft 12. The piston 123 is coupled to the crankshaft ΐ2 through the connecting rod 122. In this embodiment, the π cylinder 112 is a cast component in which a single cylinder bore 24 is formed. A piston 123 connected to the crankshaft 121 is housed in the cylinder 124. The cylinder head 113 is attached to an opening at the head side of the cylinder 124. In this embodiment, as shown in Figs. 2 and 3, the cylinder head 丨丨 3 has a recess 丨 25 in the surface facing the cylinder 124. The combustion chamber is formed between the recess 125 and the piston 123. The cylinder head 11 3 has a pair of inlet ports 126, 127 open to the combustion chamber (only one inlet is shown in FIGS. 2 and 3), and the combustion chamber A single exhaust port 128 is open. Inlet port 126 (127) and exhaust port 128 (shown in Figure 3) include respective valve seats 126a (127a) and 128a, valve guides 126b (127b) and 128b. The valve seat 126a (127a), 128a is a member for resting the valve head portion 301 (302), 303 of the intake valve 131 (132) and the exhaust valve 133 described hereinafter. The valve guides 126b (127b), 128b are members for guiding the intake valve 131 (132) and the exhaust valve 133, and by the intake valve 131 (132) and the valve stem 311 of the exhaust valve 133 described hereinafter. (3 12) and 313 are formed by inserting an insertion hole therethrough. Further, the magazine seats 126c (127c) and 128c are disposed in the periphery of the opening of the outer side of the valve guides 126b (127b), 128b. The intake valve 131 (132) and the valve springs 321 (322), 323 of the exhaust valve 133 described hereinafter are placed on the magazine seats 126c (127c), 128c. The intake valve 131 (132) and the exhaust valve 133 are respectively provided with a valve head portion 301 (302) and 303, a valve stem 311 (31 2) and 313, a valve spring 321 (322), and a 133175.doc 1359229 323, and a valve buckle. Pieces 33 1 (332) and 333. The valve head portions 301 to 303 are members that perform the function of a valve as fitted to the valve seats 126a (127a), 128a of each of the ports 126 to 128. The valve stems 31A to 313 are shafts that support the valve head portions 301 to 303. Each of the valves 131 to 133 has a structure in which the valve stems 311 to 313 are inserted into the valve guides 126b (127b), 128b from one of the ports 126 to 128 of the cylinder head ι13. When the valve head portions 3〇1 to 303 are fitted with the valve seats 126a (127a), 128a, the valve stems 311 to 313 protrude from the valve guides 126b (127b), 128b above the cylinder head in to determine the distance. The valve springs 321 to 323 are attached to the valve stems 3A to 313 which protrude to the outer side of the cylinder head i丨3. The valve springs 321 to 323 are placed on the spring seats 126c (127c), 128c provided in the cylinder head 113. Further, the valve fasteners 331 to 333 are attached to the end portions ' of the valve stems 311 to 313 where the valve springs 321 to 323 are in a compressed state. The valve springs 32 1 to 23 23 are attached in a compressed state between the valve fasteners 33 1 to 33 3 and the spring seats 126c (127c), 128c. Each of the valves 131 to 133 is pushed up from the cylinder head 113 by the elastic reaction force of the valve springs 321 to 323. In this state, the valve head portions 3〇丨 to 3〇3 are fitted to the valve seats 126a (127a), 128a of each of the ports 126 to 128, and each of the ports 126 to 128 is closed. If the valve stems 311 to 313 are pushed downward due to any kind of external force, the valve head portions 301 to 303 are separated from the valve seats 126a (127a), 128a of each of the ports 126 to 128, and each of the ports 126 to 128 is opened. Further, when the force is stopped by pushing the valve stems 311 to 313 downward, the elastic reaction forces of the valve springs 321 to 323 push up the valve fasteners 331 to 333. Therefore, the valve head portions 301 to 303 rest on the valve seats 126a (127a), 128a of each of the ports 126 to 128, and each of the ports 126 to 128 is closed again. 133175.doc •10· 1359229 In this embodiment, the valve stems 311 to 313 are pushed down by the rocker arms 412, 4丨3 described below. The shim 341 (342), 343 is attached to the tip end portion of the valve stem to 3 13 and the thickness of each shim 341 to 343 is adjusted to connect the rocker arms 412, 413 with the valve stems 311 to 313 The gap is adjusted to an appropriate value. Next, the rocker arm will be explained. In this embodiment, the rocker arms 412, 413 use a roller rocker arm (rocker roller) that is in contact with the cams 451, 452 at the contact portion and reduces the contact resistance with the cams 451, 452, thereby improving fuel efficiency. Roller 476 (486) The rocker arms 412, 413 are disposed in a valve mechanism chamber 600 formed in the cylinder head 113. The cylinder head 113 (shown in Figure 3) includes a bottom dividing wall 61A that divides a portion that forms an inlet 126 〇 27) and an exhaust port (128). Further, as shown in Figs. 3 to 5, the valve mechanism chamber 600 is formed on the outer side of the bottom partition wall 6 1 藉 by projecting to the four outer wall ό 11 to 61 of the opposite sides of the cylinder block 112. The valve mechanism chamber 600 surrounds the hole center line 〇 1, and the hole center line 〇 1 is the extension of the center line of the cylinder 124. In this embodiment, the valve mechanism chamber 600 is divided into two sub-chambers by the wall 615. The support wall 615 is disposed between the first outer wall 611 and the second outer wall 612 facing each other, and protrudes from the bottom partition wall 610 of the valve mechanism chamber 6〇〇. One side of the wall 615 is adjacent to the third outer wall 613. In this embodiment, the open end of the valve mechanism chamber 600 is covered by an attachable and removable cylinder head cover 114. As can be seen from FIGS. 3 and 4, the valve stems 311 to 313 of each of the valves 131 to 133 described above, which are between the first outer wall 611 and the support wall 615, protrude from the first to the outer wall 611 and the support wall 615. In a chamber 601, again, as shown in FIG. 3, valve springs 321 to 323 and valve fasteners 331 to 333 are disposed in the first chamber 601. The intake valve 131 (132) shown in FIG. 3 and the valve guide 126b (127b), 128b of the exhaust valve 133 are in the first chamber 601 (which is between the first outer wall 611 and the support wall 615, as shown in FIG. The opening is shown, and each of the 131 to 133 wide rods 311, 312, 313 protrudes into the first chamber 601. The valve mechanism chamber 600 houses a valve drive mechanism 4 that drives the intake valves 131, 132 and the exhaust valve 133 to open and close. The valve drive mechanism 400 includes a cam shaft 411, a first rocker arm 412 for air intake use, a second rocker arm 413 for exhausting, and a first rocker shaft 414' that axially supports the first rocker arm 412. And supporting the second rocker arm shaft 415 of the second rocker arm 413 in an axial direction. The cam shaft 411 (shown in Fig. 5) is supported by the first outer wall 611 of the cylinder head 113 and the support wall 615 via the respective bearings 421, 422. Note that in order to make the drawing easier to understand, the rocker arms 412, 413 and the rocker shafts 414, 415 ° camshafts 4 11 are omitted in Fig. 5 to provide a right angle extension with respect to the hole center line. The cam shaft 411 (shown in Figure 4) passes through the support wall 615 and projects into the second chamber 〇2 between the support wall 615 of the cylinder head 113 and the second outer wall 612. A sprocket 423 is attached to the protruding portion. The key strip 424 is suspended between the sprocket bucket and the crankshaft 1 2 1 (see Fig. 2). The chain 424 is for inputting a rotational driving force to the cam pumping 411, and rotating the cam shaft 411 at a rotational speed which is aligned with the rotation of the crank shaft 121 and which is half the speed of the crank shaft 121. 133175.doc • 12· a As can be seen from FIGS. 3 and 5 , the camshaft “丨 has an intake cam 451 and an exhaust cam 452 » the intake cam 451 and the exhaust cam 452 are disposed axially away from the camshaft 411 The position of the distance is determined so as to correspond to the first rocker arm 412 for air intake use and the second rocker arm 413 for exhaust use, respectively. Note that in this embodiment, the oil supply passage 453 is formed on the camshaft In 411, lubricating oil is supplied to the cam surfaces of the intake cam 45丨 and the exhaust cam 452. Next, the rocker arms 412, 413 will be described. The first rocker arm shaft 414 that axially supports the first rocker arm 412 And a second rocker arm shaft 415 (shown in FIG. 3) axially supporting the first rocker arm 413 is disposed parallel to the cam shaft 411 at a position shifted diagonally from the cam shaft 411 to the upper side. More specifically The first rocker arm shaft 414 and the second rocker arm shaft 415 (shown in FIG. 4) have a bearing member 461 fitted into the first outer wall 611 of the cylinder head i 13 disposed on the side of the valve mechanism chamber 6 One end of the 462 and the other end of the bearing holes 463, 464 that pass through the support wall 61 5 . A rocker arm 412 is provided with a cylindrical protrusion member 471, a roller support member 472, and a pair of arm members 473, 474. A bearing hole 475 through which the first rocker arm shaft 414 is inserted is formed in the protrusion member 471, and the first shake The arm shaft 414 is inserted into the bearing hole 475 so that it can slide in the axial direction and the circumferential direction. The roller support member 472 extends from the outer peripheral surface of the protruding member 471 in the upward direction of the cam shaft 411, and rotatably supports the roller 476 The roller 476 (not shown in FIG. 3) is in rolling contact with the outer peripheral surface (cam profile) of the intake cam 451 of the camshaft 411. On the other hand, the arm members 473, 474 of the first rocker arm 4丨2 (as shown in the figure) 4) I33175.doc -13 - 1359229 The peripheral surface of the self-protrusion member 471 protrudes toward the opposite side of the roller support member 472. The arm members 473, 474 are divided into two branches, and the tips of the arm members 473, 474 are distant and Positioned toward the tips of the valve stems 3 11 , 3 12 of the two intake valves 13 1 (132) provided in the cylinder head bore 13. The tips of the arm members 473, 474 (shown in Figure 3) are squeezed. The head of the valve stem 311 (312) of each of the intake valves 13ι, ι32 Pressing portions 477, 478. The second rocker arm 413 for exhausting use has a cylindrical projecting member 481, a roller support member 482, and an arm member 483. The second rocker arm shaft 415 is formed by a bearing hole 485 inserted therethrough. In the protruding member 481, and the second rocker arm shaft 415 is inserted through the bearing hole 485 so that it can slide in the axial direction and the circumferential direction. The roller supporting member 482 protrudes from the outer peripheral surface of the protruding member 48 1 and is rotatably Support roller 486. The roller 486 (shown in FIG. 3) is in rolling contact with the outer peripheral surface (cam profile) of the intake cam 451 of the camshaft 411. On the other hand, the arm member 483 of the second rocker arm 413 protrudes from the outer peripheral surface of the projecting member 481 toward the opposite side of the roller support member 482. The tip end of the arm member 483 is provided with a pressing portion 487° that presses the tip end of the valve stem 3U to 313 of the exhaust valve 133. In this embodiment, as seen from Figs. 3 and 4, the shim 341 having a specific thickness. Up to 343 is attached to the upper portion of each of the valve stems 3 11 to 3 13 . The thickness of the shims 341 to 343 is adjusted to adjust the gap between the rocker arms 412, 413 and the valve stem to 3 13 to an appropriate value. This operation is performed in the case where the rocker arms 412, 4丨3 are displaced with respect to the positions of the heads of the valve stems 3 11 to 3 13 as shown in Figs. 6 and 7; In this manner, it is preferable to easily displace the rocker arms 412, 413 with respect to the position of the heads of the valve stems 311 to 313 from the viewpoint of easier adjustment and maintenance of the valve drive mechanism 133175.doc 14 1359229. Moreover, from the standpoint of allowing the valve drive mechanism 400 to function normally, a configuration is employed that the position of the rocker arms 412, 413 on the rocker shafts 414, 415 is determined to be at an appropriate position at which the rocker arms 412 are located. '413 is positioned at a specific position with respect to the valve stems 311 to 313. In this embodiment, the projection member 47 1 of the first rocker arm 41 2 is branched by the first rocker arm shaft 414 so that it can slide in the axial direction. More specifically, the first rocker arm 41 2 (shown in Fig. 4) slides between the first position and the first position in the axial direction of the first rocker arm shaft 414. At the first position, the pressing member 477 (478) of the arm member 473 (474) faces the tip end of the valve stem 311 (312), and at the second position, as shown in Fig. 6, the arm member 473 (474) The pressing member 477 (478) is offset from the tip end of the valve stem 311 (31 2) to the side. On the other hand, the projecting member 481 of the second rocker arm 413 is supported by the second rocker arm shaft 415 so that it can slide in the axial direction. More specifically, the second rocker arm 413 (shown in FIG. 3) slides between the first position and the second position in the axial direction of the second rocker shaft 415" at the first position, the extrusion of the arm member 483 The pressing member 487 faces the tip end of the valve stem 313, and at the second position, as shown in Fig. 7, the pressing member 487 of the arm member 483 is displaced from the tip end of the valve stem 313 to the side. In this embodiment, as shown in FIG. 4, at the respective first positions, the first rocker arm 412 abuts the bearing member 461 disposed in the first outer wall 611 at the side of the valve mechanism chamber 600, and the second shake The arm 413 abuts the support arm 615. Further, the positions of the pressing members 133175.doc •15-1359229 477, 478, 487 of each of the 'arm members 473, 474, 483 are determined such that they respectively face the respective valve stems 3 11 to 3 13 Cutting edge. At this time, when the movement toward the respective positions occurs, the first rocker arm 412 and the second rocker arm 413 are axially opposite to each other on the respective first rocker arm shaft 414 and the second rocker arm shaft. Move on 415. Further, in this embodiment, the washers 501, 502 (annular members) are fitted to each of the rocker shafts 414' 415. The washer 501 '502 is fitted on the side (second position side) deviated from the first position, and at the first position, the pressing members 477, 478, 487 of the arm members 473, 474, 483 of the respective rocker arms 412, 413 Facing the tips of the valve samples 311 to 313. In this embodiment, as described above, after attaching the valve driving mechanism 4', as shown in Fig. 5, the plate 491 is attached to the upper portion of the first chamber 601 of the valve mechanism chamber 6''. As shown in FIG. 4, a through hole 603 is formed in the upper side portion of the baffle wall 615 and the first outer wall 611. Plate 491 (shown in Figure 5) is attached by screwing nut 604 to the end of a stud (not shown) protruding from through hole 603. A plate 491 (shown in Figure 8) extends and is retained between the outer wall 611 of the cylinder head usu and the support wall 615 and provides reinforcement for the top plate portion of the first chamber 60 1 of the valve mechanism chamber 6〇〇. Also, the plate 491 has an open center portion. The rocker arms 412, 413 and the rocker shafts 414, 41 5 described above are exposed via the opening 492. In this embodiment, the cylinder head cover 114 is also attached to the top plate portion of the steam red head 113. More specifically, the cylinder head cover 114 (shown in Figure 3) is a member that is attached to cover the cylinder head 113. In this embodiment, the valve mechanism chamber 600 of the cylinder head 113 described above is covered by the cylinder head cover 114. The cylinder head cover 133175.doc 16-1359229 114 (shown in FIG. 9) has a shape that can cover the opening of the top plate portion of the valve operating mechanism chamber 6 of the cylinder head 113, and the bolt hole 701 is formed in and formed on the outer wall 611 to 614 and the corresponding position of the bolt hole 6〇5 (see FIG. 4) in the support wall 615. Further, in this embodiment, the cylinder head cover 14 (shown in Fig. 9) includes a pin 711 that protrudes in a direction in which the cylinder head cover 114 is attached to the cylinder head 113. A hole 712 (in which the pin 711 provided in the cylinder head cover 114 is fitted) is formed in the upper side portion of the outer wall of the valve mechanism chamber of the cylinder head 113, as shown in Figs. 4 and 8. In this embodiment, the pin 711 is disposed at two positions in the cylinder head cover 114, and a hole corresponding to the pin 711 is formed in the cylinder head 丨丨3. The pin 7 j i and the hole 712 determine the attachment direction when the cylinder head cover 114 is attached to the cylinder head 113. Further, since the pin 711 and the hole 712 are provided, the airiness at the time of attaching the cylinder head cover 114 is reduced, thereby reducing the attachment error of the steam red head cover 14. Note that the 'pin 711' is disposed in the cylinder head cover 114 in this embodiment, and the hole 712 is formed in the cylinder head 1丨3. However, the following is sufficient: the pin 7 ^] is disposed in one of the members (i.e., the cylinder head cover 114 and the cylinder head 113), and the hole is disposed in the other member. Accordingly, although not shown in the drawings, the pins may be disposed in the cylinder head 113, and the holes (the pins disposed in the cylinder head 113 are fitted into the holes) may be formed in the cylinder head cover 114. . Further, in this embodiment, as can be seen from Figures 3 and 5, the seal 721 is attached to the cylinder head cover 114. More specifically, as shown in Fig. 9, the seal member 721 is fitted into the groove 722 133175.doc • 17· 1359229 formed in the inner side surface of the cylinder head cover i 14 . The groove 722 is formed in a portion adjacent to the upper side portion of the cylinder head 113. Seal 721 is an annular seal having a shape that fits into groove 722. A cylinder head cover 114 (shown in Figures 3 and 5) is attached to the upper side portion of the cylinder head 113 with the seal 721 fitted into the recess 722. The seal 721 provides a hermetic seal around the entire circumference of the upper side portion of the cylinder head 113, and inhibits foreign matter from entering the valve mechanism chamber 600 of the cylinder head 113. In this embodiment, each of the rocker arms 4 1 2, 4 1 3 is guided to each of the rocker shafts 414, 415 by a cylinder head cover M disposed in the upper portion of the cylinder head 113. Specific location on the person. More specifically, the cylinder head cover 114 (shown in Fig. 9) is provided with guiding members 731, 732. The guiding members 731, 732 engage the rocker arms 412, 413 when performing attachment to the cylinder head 113 and direct the rocker arms 412, 413 to specific positions on the rocker shafts 414, 415. In this embodiment, the guiding members 731, 732 (shown in Figures 3 and 5) are protrusions that protrude in the direction in which the cylinder head cover 114 is attached to the cylinder head 113. More specifically, the guiding members 731, 732 protrude from the inner side of the cylinder head cover 114 toward the position where the first rocker arm 412 and the second rocker arm 413 provided in the valve mechanism chamber 6 are disposed. In this embodiment, the guiding members 731, 732 (as shown in Figures 9 and Figures) include recesses 733, 734 having arcuate shapes corresponding to the peripheral surfaces of the rocker shafts 414, 415. When the cylinder head cover 114 is attached to the cylinder head 113, as shown in Fig. 3, the first rocker arm shaft 414 and the second rocker arm shaft 415 are fitted to the recesses 733, 73 4 1 j ^ , T. Also in this embodiment, the guiding members 731, 732 extend toward the outside of the pair of parallel rocker shafts 414, 415. The inclined surface, 736, is disposed at the tip end of the guide bow member 73. 133175.doc 1359229 In this embodiment, the protrusion serving as the guiding members 731, 732 is disposed at a specific position (first position) from the rocker shaft 414 (when the cylinder head cover U4 is attached to the cylinder head 113) The arms 412, 413 are guided to the position of the particular position). In addition, the normal to the 'slanted surfaces 735, 736 are oriented toward the first position'. The first positions determine the position of the rocker arms 412, 413 on the arm axes 414, 415. More specifically, the first guiding member 731 guiding the first rocker arm 412 is disposed on the first rocker arm shaft 414, as shown in FIG. 9 and FIG. 11, in a deviation from the first position (at the first position, The pressing member 477 of the first rocker arm 412 (478) faces the position of the valve stem 311 (31 2) toward the second position, and the normal line hi of the inclined surface 735 of the first guiding member 731 is opposite to The direction in which the cylinder head cover ι 14 is attached to the blush head 113 is oriented toward a first position that determines the position of the first rocker arm 412 on the first rocker arm shaft 414. In addition, the second guiding member 732 guiding the second rocker arm 413 is disposed on the second rocker arm shaft 415, as shown in FIG. 9 and FIG. 12, in a deviation from the first position (at the first position, the second shaking) The pressing member 487 of the arm 413 faces the tip end of the valve stem 313 toward the second position. The normal line h2 of the inclined surface 73 6 of the second guiding member 732 is oriented toward the first position with respect to the direction in which the cylinder head cover 114 is attached to the steam red head 1丨3, the first position determining that the second rocker arm 413 is at the The position on the second rocker shaft 415. In this embodiment, when the cylinder head cover 114 is attached to the cylinder head 113, the inclined surfaces 735, 736 of the guide members 731, 732 abut (see Fig. 8) the washers 501, 502 fitted to the rocker shaft 414 '415. Further, when the cylinder head cover 114 is attached to the cylinder head 113, the rocker arms 412, 41 3 are directed toward the U3175.doc • 19· 1359229 along the rocker shafts 414, 41 5 . Once the cylinder head cover, 732 side surface, 413 is retained, the guide member 73i 737, 738 abuts the washer 501, 502, as the rocker arm is attached to the cylinder head 13 at the determined first position movement described above. And the rocker arm 412 is at a first position on the shafts 414, 415. Further, in this embodiment, as shown in FIG. 9, the cylinder head cover 114 is provided with the blocking members 741, 742, the blocking members 741, 742 are attached to the cylinder head 113 at the cylinder head cover 114 and the washers 501, 502 with respect to the guiding member 731 , 732 blocks the gaskets 501, 502 when mounted on opposite sides of the first position on the rocker shafts 414, 415. In this embodiment, the guiding members 731, 732 are provided with ribs 741, 742 on opposite sides of the first position of the rocker shafts 414, 415, and the ribs 74 1 , 742 serve as the barriers described above. member. When the cylinder head cover 114 is attached to the cylinder head 113, if the washers 5〇1, 5〇2 are mounted with respect to the guiding members 731, 732 at opposite sides from the first position of the rocker shafts 414, 415, the ribs The 741, 742 blocks the washers 5〇1, 502 so that the cylinder head cover 114 cannot be attached to the cylinder head 丨丨3. Therefore, errors caused by the negligence of the worker who performs the assembly or the like can be suppressed, and the positions of the arm members 412, 413 can be accurately determined with certainty. Further, in this embodiment, as shown in FIG. 4, the pair of rocker shafts 414, 415 are disposed in parallel in the cylinder head u3. Further, the rocker arms 4丨2, 4丨3 are attached to the rocker shafts 414, 415, respectively. Moreover, the first rocker arm 412 and the second rocker arm 413 are constructed such that when the pressing members 477, 478' 487 (see FIG. 3) of the arm members 473, 474, 483 are respectively facing the valve stems 311, 312, When the specific position of the tip of the 313 is moved, the first rocker arm 412 and the second rocker arm 413 are moved in opposite directions in the axial direction of the first rocker shaft 414 and the second rocker arm shaft 415, respectively, and are moved to 33175.doc 1359229. As shown in Fig. 9, the guide member 731 for guiding the first rocker arm 412 and the guide member 732 for guiding the second rocker arm 413 are respectively disposed in the cylinder head cover 114. When the cylinder head cover 114 is attached to the cylinder head 113, the guide members 731, 732 cause the rocker arms 412, 413 assembled to the pair of rocker shafts 414, 415 to move in opposite directions. Therefore, when the cylinder head cover 114 is attached to the cylinder head 113, an offset effect with respect to the force necessary to move the rocker arms 412, 413 can be achieved. Therefore, the force necessary to attach the cylinder head cover 114 can be reduced. Further, in this embodiment, the guide members 73 1 and 732 (described above) protrude toward the inner side of the cylinder head cover 4 . The recess is formed on the outer side of the steam head cover 114 at a portion where the guide members 73 1 and 732 are formed, and thus the forgeability is improved and the weight reduction is promoted. In this manner, the cylinder head cover 114 is provided with guiding members 731, 732, and the guiding members 731, 732 are in the cylinder head cover! The 14 is engaged with the rocker arms 412, 413 when attached to the cylinder head 113, and guides the rocker arms 412, 413 to a specific position (first position) on the rocker shafts 414, 415. In the engine 100, when the cylinder head cover 114 is attached to the cylinder head 11 3, the rocker arms 412, 413 are guided to the rocker shafts 414, 41 5 due to the provision of the guiding members 73 1 , 732 ' Specific position (first position) ^ In addition, the position of the rocker arms 412, 413 can be changed when the cylinder head cover 114 is removed. Further, in this embodiment, the springs that push the rocker arms 412, 413 to specific positions on the rocker shafts 414, 415 are not used in the technique described in jp_A_2 〇〇 6_34882. Therefore, when the cylinder head cover 114 is removed, the position of the rocker arms 412, 413 can be easily changed by 133175.doc 21 1359229. In addition, in this embodiment, the cylinder head cover 114 is attached to the upper portion of the cylinder head ι 3, and the guiding members 731, 732 are attached to the rocker arms 412, 413 and the rocker arms 412, 413 are held by the rocker arm. At a specific location on 414, 415. Therefore, even if the engine 1 oscillates, the movement of the rocker arms M2, 413 in the axial direction of the rocker arm shaft can be adjusted, and the generation of abnormal noise can be suppressed.

’且可容易地執行維護工此外，在此實施例中，搖臂412、413具有一結構：設置於汽缸頭蓋U4中之導引構件731、732鄰接裝配至搖臂軸 414、4!5之墊圈501、502。墊圈5〇1、5〇2内插於設置於汽缸頭蓋H4令之導引構件？31、732與搖臂412、413之間。因此，導引構件73卜732並不與在使用期間強烈搖動之搖臂412、413直接接觸，且因此可減小汽缸頭蓋114中之振動及磨損之產生。此外，由於將卷圈5〇1、5〇2内插於設置於气缸頭蓋114中之導引構件73 1、732與搖臂412、413之間，所以當將汽缸頭蓋114組裝至汽缸頭i丨3時，來自導引構件731、732之作用於墊圈501、5〇2上之力經由墊圈 5〇1、502而作用於搖臂412、413上。因此，因為軸向力作用於搖臂412 ' 413上，所以亦可減小將汽缸頭蓋114組裝至〉飞缸頭113時的阻力。因此，以下為有利的：塾圈5 〇 i、 502具有所需之強度’且具有使得表面處理允許減小磨損之表面結構。可將複數個墊圈5〇1、502内插於搖臂412、 413與導引構件731、73 2之間。此外，在此實施例中，導引構件73 1、732(如圖5及圖9 133175.doc •22· 1359229 所不）具備在汽缸頭蓋114附接至汽缸頭113時導引搖臂 412、413之傾斜表面735、736。設置傾斜表面、了刊允許導引搖臂412、413，且因此因為當將汽缸頭蓋114組裝至汽缸頭113時可以連續漸進方式導引搖臂“〗、413，所以將π缸頭蓋114組裝至汽缸頭i i 3時之阻力得以減小，且使得組裝操作更容易。'And the maintenance worker can be easily performed. Further, in this embodiment, the rocker arms 412, 413 have a structure in which the guide members 731, 732 provided in the cylinder head cover U4 are adjacently fitted to the rocker shafts 414, 4! Washers 501, 502. The washers 5〇1, 5〇2 are inserted into the guide members provided in the cylinder head cover H4. 31, 732 and between the rocker arms 412, 413. Therefore, the guide member 73 732 does not directly contact the rocker arms 412, 413 which are strongly rocked during use, and thus the occurrence of vibration and wear in the cylinder head cover 114 can be reduced. Further, since the winding rings 5〇1, 5〇2 are interposed between the guiding members 73 1 and 732 provided in the cylinder head cover 114 and the rocker arms 412 and 413, when the cylinder head cover 114 is assembled to the cylinder head i At 丨3, the forces acting on the washers 501, 5〇2 from the guiding members 731, 732 act on the rocker arms 412, 413 via the washers 5, 1, 502. Therefore, since the axial force is applied to the rocker arm 412 ' 413, the resistance when the cylinder head cover 114 is assembled to the "flying cylinder head 113" can also be reduced. Therefore, it is advantageous that the turns 5 〇 i, 502 have the required strength ' and have a surface structure that allows surface treatment to reduce wear. A plurality of washers 5, 1, 502 can be interposed between the rocker arms 412, 413 and the guiding members 731, 73 2 . Moreover, in this embodiment, the guiding members 73 1 , 732 (not shown in FIGS. 5 and 9 133175 . doc • 22· 1359229) are provided with the guiding rocker 412 when the cylinder head cover 114 is attached to the cylinder head 113, The inclined surfaces 735, 736 of 413. Providing the inclined surface, the publication allows the guiding of the rocker arms 412, 413, and thus because the rocker arm "", 413 can be guided in a continuous progressive manner when the cylinder head cover 114 is assembled to the cylinder head 113, the π cylinder head cover 114 is assembled to The resistance at the cylinder head ii 3 is reduced and the assembly operation is made easier.

在上文中，描述了根據本發明之實施例之引擎。然而，根據本發明之引擎不限於上文所描述之實施例。 +例而σ，在上述實施例中作為實例加以描述之引擎 (且特定言之，閥驅動機構等之結構）僅為應用本發明之實施例之—實例U，本發明不限於上文所描述之實施例。引擎(且特定言之，閥驅動機構等之結構)可應用於各種結構。In the above, an engine according to an embodiment of the present invention has been described. However, the engine according to the present invention is not limited to the embodiments described above. + Instance, σ, the engine described in the above embodiment as an example (and in particular, the structure of the valve drive mechanism, etc.) is only an example of the application of the present invention - the example U, the invention is not limited to the above description An embodiment. The engine (and in particular the structure of the valve drive mechanism, etc.) can be applied to various structures.

卜在上述實例中，安置於汽紅頭113之上部部分處且具備導引構件731、732之上部配置構件為覆蓋汽虹頭之頂邛。卩分之汽缸頭蓋丨丨4。然而，上部配置構件不限 ;為气缸頭蓋114。只要上部配置構件為安置於汽缸頭 7 之上部部分處且具有如上文所描述之導引構件之導引構件 732的構件，上部配置構件即可為支㈣驅動機構之凸輪構件之構件(如凸輪載體、凸輪固持器等” 此外’在上文描述中’描述可鄰接搖臂之墊圈裝配至搖 :之結構 '然而’可使用未設置塾圈且搖臂直接鄰接導引椹t之結構。在此狀況下，以下為有利的：對搖臂與導冓件接觸之部分應用表面處理以便抑制磨損。 i33175.dc, •23· 此外《配至搖g轴之構件不限於堅圈。可使用具有環形形狀之任何構件。注意，以下為特別有利的：環形構件具有所需之強度、材料等以達成與上文所描述之墊圈相同之效應。上文所描述之引擎可用作（例如）安裝於跨坐型車輔（如速克達摩托車)中之引擎。此外，上文所描述的引擎之結構不僅可有利地用於上文所描述之類型的引擎中，而且可用於各種其他類型之引擎中。【圖式簡單說明】圖1為展不配備有根據本發明之實施例之引擎的摩托車之一實例的側視圖。圖2為根據本發明之實施例的引擎之部分的橫截面圖。圖3為與根據本發明之實施例之引擎的閥驅動機構有關的橫戴面圖，且其展示凸輪轴、打開及閉合進氣閥之第一搖臂及打開及閉合排氣閥之第二搖臂的位置關係。圖4為根據本發明之實施例的引擎之汽缸頭的平面圖，展示第一及第二搖臂分別固持在第一位置處時的狀態。圖5為包括根據本發明之實施例之引擎的凸輪軸之汽缸頭的橫截面圖。圖6為根據本發明之實施例的引擎之汽缸頭的平面圖，其展示第一搖臂已移動至第二位置時的狀態。圖7為根據本發明之實施例的引擎之汽缸頭的平面圖，其展示第二搖臂已移動至第二位置時的狀態。圖8為根據本發明之實施例的引擎之汽缸頭的平面圖， 133175.doc •24· 1359229 其展示移除汽缸頭蓋時的狀態。圖9為根據本發明之實施例的引擎之汽缸頭蓋的底面視圖。圖10為沿著圖9中之箭頭F之方向的橫截面圖，其展示設置於根據本發明之實施例的引擎之汽缸頭蓋中的導引構件。圖11為沿著圖9中之箭頭Η之方向的橫截面圖，其展示設In the above example, the upper portion of the steam red head 113 is disposed and provided with the upper member of the guiding members 731, 732 to cover the top of the steam head. The cylinder head cover 卩4. However, the upper configuration member is not limited; it is the cylinder head cover 114. As long as the upper disposition member is a member disposed at the upper portion of the cylinder head 7 and having the guide member 732 of the guide member as described above, the upper disposition member may be a member of the cam member of the (four) drive mechanism (such as a cam) Carrier, cam holder, etc." In the above description, the description of the structure that can be attached to the rocker arm can be assembled to the structure of the rocker: however, a structure in which the ring is not provided and the rocker arm directly abuts the guide 椹t can be used. In this case, the following is advantageous: surface treatment is applied to the portion where the rocker arm is in contact with the guide member to suppress wear. i33175.dc, •23· In addition, the member to the g-axis is not limited to the ring. Any member of the toroidal shape. Note that the following is particularly advantageous: the annular member has the required strength, material, etc. to achieve the same effect as the gasket described above. The engine described above can be used, for example, for installation. An engine in a straddle-type vehicle (such as a Skoda motorcycle). Furthermore, the structure of the engine described above can be advantageously used not only in an engine of the type described above, but It can be used in various other types of engines. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a side view showing an example of a motorcycle that is not equipped with an engine according to an embodiment of the present invention. Fig. 2 is a view of an embodiment of the present invention. Figure 3 is a cross-sectional view of a valve drive mechanism of an engine in accordance with an embodiment of the present invention, and showing the camshaft, opening and closing the first rocker arm of the intake valve and opening And the positional relationship of the second rocker arm of the closed exhaust valve. Fig. 4 is a plan view showing the cylinder head of the engine according to an embodiment of the present invention, showing the state in which the first and second rocker arms are respectively held at the first position. Figure 5 is a cross-sectional view of a cylinder head including a camshaft of an engine in accordance with an embodiment of the present invention. Figure 6 is a plan view of a cylinder head of an engine showing the first rocker arm moved to a first stage in accordance with an embodiment of the present invention. Figure 2 is a plan view of a cylinder head of an engine showing the state in which the second rocker arm has moved to the second position, in accordance with an embodiment of the present invention. Figure 8 is an engine in accordance with an embodiment of the present invention. Plan view of the cylinder head, 133175.doc • 24· 1359229 which shows the state when the cylinder head cover is removed. Fig. 9 is a bottom view of the cylinder head cover of the engine according to an embodiment of the invention. Fig. 10 is an arrow along the line of Fig. 9. A cross-sectional view of the direction of F showing a guide member disposed in a cylinder head cover of an engine according to an embodiment of the present invention. Fig. 11 is a cross-sectional view along the direction of arrow 图 in Fig. 9, showing

置於根據本發明之實施例的引擎之汽缸頭蓋中的第一導引構件。圖12為沿著圊9中之箭頭G之方向的橫截面圖，其展示設置於根據本發明之實施例的引擎之汽缸頭蓋中的第二導引構件。【主要元件符號說明】 100 弓|擎 101 擺動型引擎單元A first guiding member placed in a cylinder head cover of an engine according to an embodiment of the present invention. Figure 12 is a cross-sectional view along the direction of arrow G in the crucible 9 showing the second guiding member disposed in the cylinder head of the engine in accordance with an embodiment of the present invention. [Main component symbol description] 100 bow|Qing 101 Swing type engine unit

111 曲柄轴箱 112 汽缸體 113 汽紅頭 114 汽虹頭蓋 121 曲柄轴 !22 連接桿 123 活塞 124 單虹/汽缸 125 凹座 I33l75.doc -25- 1359229 進氣口閥座閥導彈簣座進氣口閥座閥導彈簧座排氣口閥座閥導彈簧座進氣閥進氣閥排氣閥傳動箱後輪閥頭部分閥頭部分閥頭部分閥桿閥桿閥桿閥彈簧 133175.doc •26· 1359229111 crankcase 112 cylinder block 113 steam red head 114 steam head cover 121 crank shaft! 22 connecting rod 123 piston 124 single rainbow / cylinder 125 recess I33l75.doc -25- 1359229 inlet valve seat valve missile sump air intake Seat valve guide spring seat exhaust port seat valve guide spring seat intake valve intake valve exhaust valve transmission box rear wheel valve head part valve head valve head part stem valve stem valve stem valve spring 133175.doc •26 · 1359229

322 閥彈簧 323 閥彈簧 331 闊扣件 332 閥扣件 333 閥扣件 341 填隙片 342 填隙片 343 填隙片 400 閥驅動機構 411 凸輪轴 412 第一搖臂 413 第二搖臂 414 第一搖臂軸 415 第二搖臂軸 421 轴承 422 軸承 423 鏈輪 424 鏈條 451 凸輪 452 凸輪 453 供油通道 461 軸承構件 462 軸承構件 463 轴承孔 133175.doc -27- 1359229322 valve spring 323 valve spring 331 wide fastener 332 valve fastener 333 valve fastener 341 shim 342 shim 343 shim 400 valve drive mechanism 411 camshaft 412 first rocker arm 413 second rocker arm 414 first Rocker shaft 415 Second rocker shaft 421 Bearing 422 Bearing 423 Sprocket 424 Chain 451 Cam 452 Cam 453 Oil supply passage 461 Bearing member 462 Bearing member 463 Bearing hole 133175.doc -27- 1359229

464 軸承孔 471 突起構件 472 滾輪支撐構件 473 臂構件 474 臂構件 475 轴承孔 476 滾輪 477 擠壓構件 478 擠壓構件 481 突起構件 482 滾輪支撐構件 483 臂構件 485 轴承孔 486 滾輪 487 擠壓構件 491 板 492 開口 501 墊圈（環形構件） 502 墊圈（環形構件） 600 閥動機構室 601 第一腔室 602 第二腔室 603 通孔 604 螺母 133175.doc -28- 1359229 605 螺栓孔 610 底部分割壁 611 外壁/第一外壁 612 外壁/第二外壁 613 外壁/第三外壁 614 外壁 615 支撐壁 701 螺栓孔464 bearing hole 471 protruding member 472 roller supporting member 473 arm member 474 arm member 475 bearing hole 476 roller 477 pressing member 478 pressing member 481 protruding member 482 roller supporting member 483 arm member 485 bearing hole 486 roller 487 pressing member 491 plate 492 opening 501 washer (annular member) 502 washer (annular member) 600 valve mechanism chamber 601 first chamber 602 second chamber 603 through hole 604 nut 133175.doc -28- 1359229 605 bolt hole 610 bottom partition wall 611 outer wall /First outer wall 612 outer wall / second outer wall 613 outer wall / third outer wall 614 outer wall 615 support wall 701 bolt hole

711 銷 712 礼 721 密封件 722 凹槽 731 第一導引構件（突起部） 732 第二導引構件（突起部） 733 凹座 734 凹座711 pin 712 721 seal 722 groove 731 first guide member (protrusion) 732 second guide member (protrusion) 733 recess 734 recess

735 傾斜表面 736 傾斜表面 737 導引構件之側表面 738 導引構件之側表面 741 肋狀物（阻擋構件） 742 肋狀物（阻擋構件） 1000 摩托車（車輛） hi 傾斜表面之法線 133175.doc •29· 1359229 h2 傾斜表面之法線 01 礼中心線735 inclined surface 736 inclined surface 737 side surface of guiding member 738 side surface 741 of guiding member rib (blocking member) 742 rib (blocking member) 1000 motorcycle (vehicle) hi normal of inclined surface 133175. Doc •29· 1359229 h2 Normal to the inclined surface 01 Ceremony center line

-30 133175.doc-30 133175.doc

Claims

229 X. Patent application scope:

An engine having a cylinder head having a structure, wherein the valve drive mechanism includes a rocker arm shaft assembled to the cylinder head, and a rocker arm fitted to the rocker arm shaft so as to be a shaft-upper configuration member attached to the steam red head: the upper moving/upper core member is provided with a guiding member that is attached to the steam red head when the 2. The rocker arm is halved and the rocker # is guided to a specific position on the rocker shaft. The engine of claim 1, wherein the armor member is assembled to the rocker arm, s ^ ^ the rocker arm, 1 is such that the piglet (four) member can be attached to the steam red head by the Si: member, the guide The member guides the rocker arm to the specific position 3 on the rocker arm shaft via a shape member, such as: the engine of claim 1 or claim 2, wherein the member covers two pieces that have been attached to the steam head , the upper configuration: 盍亥摇 # 装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配装配The guiding member and the rocker arm are at specific positions. ° 'and the rocker arm is held on the rocker arm. The 133175.doc 5. The engine of claim 3, wherein the guide member is a protrusion protruding in the upper configuration member (four) to the direction . The item::: the bow of the item 4, wherein the protrusion has an inclined surface, the surface is attached to the upper arrangement member: the annular member is disposed, and the rocker arm is guided to the exhaust shaft The upper::: 7 is set, wherein the protrusion is located at a position deviating from the rocker arm of the cylinder, and when the upper configuration member is attached, the rocker is guided to the rocker shaft Determining the specific position 'and one of the inclined surfaces toward the specific position of the position of the arm, determining the rock. 8. The engine of claim 5, wherein the annular member adjacent to the rocker arm is assembled to the a rocker shaft, and the == member has a -resisting member, when the upper member is disposed, at the opposite side of the annular member relative to the guiding member, the opposite side of the specific position of the center of resistance The condition blocking member can block the annular member. 9. The engine of claim 1, wherein in the upper configuration member or the cylinder head = member has - in the upper configuration member attached to the other member in the direction of + u ^ ^ in the upper portion The configuration member or the cylinder head is configured to be formed with one of the holes in which the upper configuration member is attached to the cylinder head. 10. In the engine of the request item i, the upper configuration member is a cylinder head cover covering the portion of the cylinder head of the steam cylinder J33I75.doc 1359229. 11. The engine of claim 1, wherein the pair of rocker shafts are disposed in parallel to the cylinder head to be coupled to the pair of rocker shafts, and when the upper configuration member is attached to the cylinder head, fitting to the pair of rockers The rocker arms of the arm shaft are in the opposite 12. A vehicle comprising the engine of claim 1. And the rocker arms are mounted, and the guiding members are moved in the direction.

133175.doc