1248491 (1) 疚、發明說明 【發明所屬之技術領域】 本發明’係關於在內燃機的閥門裝置之搖臂軸的止轉 裝置。 【先前技術】 過去’被壓入搖臂軸孔的搖臂軸之防脫落用的止動器 已被揭示（例如參照專利文獻i。）。並且，也有如在第8 圖所示之搖臂軸的止轉裝置。此係，在2支搖臂軸0 2 6間， 將標置板0 4 0之中央部在缸頭〇 4以鎖緊螺栓0 2 3螺固，將在 其標置板040的左右臂部之兩端部下面對稱地被形成止轉 部040a抵接在2支搖臂軸026之缺口部〇26a，而將此等搖臂 軸02 6止轉。再者，第8圖中的圖號〇1 8爲表示凸輪軸，019 係表示凸輪軸軸承。 〔專利文獻1〕 曰本特開2000 — 329002號公報（段落〇〇41，第6圖、 第7圖） 【發明內容】 〔所要解決之課題〕 在前述過去的搖臂軸之止轉裝置’係將標置板040以 鎖緊螺栓〇 2 3鎖緊時，因標置板〇 4 〇會向其鎖緊方向旋轉’ 將在鎖緊旋轉方向的後側（在第8圖爲左側）之一方的搖 臂軸02 6之缺口部0 2 6 a和標置板040的止轉部040 &之間產生 (2) (2)1248491 若干的空隙S。因此，在內燃機之運轉中，有在其空隙s起 因的以搖臂軸026之鬆動轉動而發生雜音的問題。 〔爲了解決課題之手段及效果〕 爲了解決前述過去的課題，申請專利範圍第1項之發 明’係在內燃機的缺頭內把丨對搖臂軸互相隔著間隔倂設 ’將吸·排氣凸輪和吸·排氣閥分別連接之i對搖臂軸由 上述搖臂軸分別支持成能夠搖動的內燃機之閥門裝置，在 上述1對搖臂軸的各一部份，形成互相相對之缺口部，在 此等缺□部之間’把從凸輪軸方向觀察的斷面不平行之限 希ij構件插入’把該限制構件從缸頭蓋內面推壓爲特徵之搖 臂軸的止轉裝置。 申請專利範圍第1項之發明係如上述地被構成，在搖 胃軸的互相相對之缺口部間，把從凸輪軸方向觀察的斷面 不是平行之限制構件插入，因將該限制構件由缸頭蓋內面 堆壓’故能使搖臂軸和限制構件不搖幌地密接而固定。因 此’能夠防止由搖臂軸的鬆動轉動之雜音的發生和軸承之 磨損。並且’因以缸頭蓋將限制構件推壓而固定，將能省 略過去的搖臂軸止轉裝置所需要之限制構件的鎖緊螺栓， 螺孔加工工程，鎖緊工程，在成本面也將成爲有利。 接著申請專利範圍第2項之發明，係如前述申請專利 範圍第1項之發明’其特徵爲上述限制構件係成爲使缸頭 內的凸部向凸輪軸方向挾入之形狀者。 如此地在申請專利範圍第2項之發明，因係以將缸頭 (3) 1248491 內的凸部挾入之形狀把限制構件的凸輪軸方向位置限制， 也能防止搖臂軸之軸方向的偏移所引起之磨損。並且，將 限制構件用既有的凸部固定，在缸頭側將不需要做特別之 加工，而能把位置固定。 接著申請專利範圍第3項之發明，係如前述申請專利 範圍第2項之發明，其特徵爲在上述限制構件和上述缸頭 蓋內面之間，及上述限制構件與上述凸部之間被配置彈性 構件。 如此地在申請專利範圍第3項之發明，因挾著彈性構 件把限制構件固定，故能確實把限制構件固定。並且，缸 頭蓋的振動將由彈性構件被吸收，故由振動之噪音將被減 低。 並且申請專利範圍第4項之發明，係如前述申請專利 範圍第2項或第3項中的其中一項之發明，其中上述凸部爲 凸輪軸座，且上述限制構件係抵接在凸輪軸軸承的外側面 爲特徵。 如此地根據申請專利範圍第4項之發明時，將在凸輪 座位置將限制構件固定，同時也固定凸輪軸軸承的位置， 故凸輪軸軸承之幌蕩情形將會消失，而提高凸輪軸軸承的 耐久性。 【實施方式】 〔發明之實施形態〕 第1圖係將被適用本發明的一實施例之內燃機在略通 -6- (4) 1248491 過曲柄軸線和缸軸線的平面切斷之縱斷面圖，第2圖爲同 樣地在略通過缸軸線而在與曲柄軸線正交的平面切斷之縱 斷面圖’第3圖係同樣地在凸輪鏈附近與曲柄軸線正交的 平面切斷之縱斷面圖，第4圖係將第1圖的上部擴大而顯示 之圖。 本內燃機1，係頭閥式4行程循環單氣缸內燃機，其本 體’係由：左右分割的左曲柄箱2 a，右曲柄箱2 b，和缸塊 3，和缸頭4，和缸頭蓋5，和左曲柄箱蓋6 a，及右曲柄箱 蓋6b而成。左曲柄箱2a和右曲柄箱2b將互相被合併，在其 上方被依次重疊缸塊3，缸頭4，缸頭蓋5。並且，在左曲 柄箱2a的左側面有左曲柄箱蓋6a，在右曲柄箱2b之右側面 有右曲柄箱蓋6b，將被分別合倂。然後，此等左右的曲柄 箱2 a、2 b，缸塊3，缸頭4，缸頭蓋5，左曲柄箱蓋6 a，右 曲柄箱蓋6 b，將以螺栓等被互相一體地結合。 並且如在第1圖，第2圖所示，將在缸塊3所形成的缸 孔7，活塞8將自由滑動地被嵌裝，同時在左右的曲柄箱2a ，2b有曲柄軸9被軸支承爲能夠旋轉。然後，在活塞8和曲 柄軸9，分別經由活塞銷1 0和曲柄銷1 1，連桿1 2的兩端被 樞裝成能夠旋轉。如此地，由缸孔7頂部的燃燒室1 3內之 混合氣的燃燒，活塞8往復動時，成爲曲柄軸9將被旋轉驅 動。 而且，在缸孔7的頂部之燃燒室1 3連通的吸氣口 1 4及 排氣口，被形成在缸頭4，在此等吸氣口 1 4及排氣口 1 5， 分別有吸氣閥1 6及排氣閥1 7被設成自由開閉（參照第2圖 (5) 1248491 然後，鄰接在吸氣閥1 6及排氣閥1 7的頂端，被配置有 凸輪軸1 8。該凸輪軸1 8的一端部（在第1圖，第4圖爲左端 部）。係經由凸輪軸軸承1 9 a，被缸頭4和凸輪軸座2 0挾住 自由旋轉地軸支，另一端部（在第1圖，第4圖爲右端）， 係經由凸輪軸軸承1 9 b，在缸頭4被軸支成自由旋轉。在凸 輪軸1 8的上述一端部，有從動鏈輪2 1和磁鐵座2 2被依次重 疊而以螺栓23被一體地安裝。一方面在曲柄軸9有驅動鏈 輪2 4被一體地設置，在該驅動鏈輪2 4和上述從動鏈輪2 1被 架裝有循環式的凸輪鏈條2 5。 並且如第2圖所示，在吸氣閥1 6及排氣閥1 7的頂部和 凸輪軸1 8之上方的中間，分別有1對搖臂軸2 6，使軸線成 水平被配置，皆係兩端被嵌合在缸頭4和凸輪軸座2 0。在 此等1對搖臂軸26，分別有搖臂28被樞支成可自由搖動。 然後在其搖臂2 8的一端被樞支安裝有滾輪2 9而抵接在前述 凸輪軸1 8之凸輪山1 8 a ’並且另一端係分別抵接在吸氣閥 1 6，排氣閥1 7的頂部。如此地在內燃機1之運轉時，將以 曲柄軸9的一半之旋轉速度。凸輪軸1 8被旋轉驅動，吸氣 閥1 6和排氣閥1 7。將在曲柄軸9每2轉時，成爲分別被各1 次地開閉驅動。 並且如在第1圖及第4圖所示，在凸輪軸1 8的一端（圖 之左端）被一體地安裝的前述磁鐵座2 2，在位於從動鏈輪 2 1之內徑側的位置處’係被形成小徑之圓筒狀，更且在其 外方處係被形成大徑的圓筒狀。然後在其大徑圓筒狀部之 (6) 1248491 內周面，經周方向等間隔地多數的永久磁 裝。 更且，在凸輪軸18之外方（在第1圖】 被配設有冷卻水泵3 0。該冷卻水泵3 0之泵 頭4的側壁所形成之開口，在該泵蓋3 1有 緊密地嵌合。其泵體3 2之圓筒狀部，係被 的大徑圓筒狀部存有一定之間隔。並且在 軸線上被配置泵軸3 3，其兩端被自由旋轉 和泵體32。在該泵軸33被著嵌有轉子34, 筒狀部，相對於在前述磁鐵座2 2被一體地 35之位置，被一體地安裝有永久磁鐵36。 3 4的圓筒狀部外方（第4圖之左方），有 形成。如此地從動鏈輪2 1被旋轉驅動時， 座22將會旋轉，在冷卻水泵30之轉子34 — 久磁鐵36，將由和磁鐵座22—起旋轉之永 跟著旋轉，而冷卻水泵3 0將被旋轉驅動。 接著第5圖係把缸頭蓋5拆卸而將缸頭 圖，第6圖爲第5圖的VI— VI端視斷面圖， 第6圖之VII — VII端視斷面圖。 在本實施例，係在1對搖臂軸26的一每 左端，而在第7圖爲下端）被形成有互相業 。然後在此等缺口部2 6 a之間’如弟ό圖所 1 8方向觀察的斷面平平行（在第6圖係爲 的錐狀體）之標置板4 〇，做爲限制構件從 鐵3 5被一體地安 泛第4圖的左方） 蓋3 1被嵌裝在缸 泵體3 2的基端被 形成對磁鐵座2 2 凸輪軸1 8的旋轉 地嵌合在泵蓋3 1 在其轉子3 4的圓 安裝的永久磁鐵 並且位於比轉子 某片37被一體地 與此一體的磁鐵 體地被安裝的永 久磁鐵3 5的磁力 I 4從上方觀察之 第7圖爲第4圖， S部（在第5圖爲 分面之缺口部26a 示地，從凸輪軸 朝下方越來越窄 上方被插入。該 -9- (7) (7)1248491 標置板4 Ο，係如第4圖及第6圖所示，下端係抵接在凸輪軸 軸承1 9 a的外環外側面，並且上部係向水平折曲而向缸頭4 內之凸部的凸輪軸座20之上方延伸，再向下方折曲，成爲 挾入其凸輪軸座2 0的形狀。而且，在標置板4 0和凸輪軸座 2 〇之間，及標置板4 0和缸頭蓋5內面之間，被配置有例如 橡膠的彈性構件4 2，而由缸頭蓋5被推壓。再者，第6圖中 之一點鏈線42 A，係表示彈性構件42的自由時形狀，把缸 頭蓋5安裝時將會被推壓，而成爲第4圖所示之形狀。並且 ，第5圖及第7圖中的圖號2 7，係爲了使搖臂軸2 8之軸方向 位置不偏位而被配設的軸環。 在如此的內燃機1，在被供給燃燒室1 3之燃料。空氣 混合氣點火時，燃料將會燃燒而燃燒室1 3的壓力將上升， 而把活塞8壓低。由於使吸氣閥1 6及排氣閥1 7動作，而以 所定的順序、時序反覆進行供排氣和點火，活塞8將往復 動。活塞8之此運動將經由連桿1 2變成曲柄軸9的旋轉，更 被傳送至未圖示之車輪等。曲柄軸9的旋轉，將再經由驅 動鏈輪24，凸輪鏈條25，從動鏈輪2 1被傳送給凸輪軸1 8， 更經由凸輪山1 8 a，搖臂2 8，將前述吸氣閥1 6，排氣閥1 7 以所定的順序·時序開關。 在本實施例，將在1對搖臂軸2 6之一端部形成互相相 對的缺口部26a，在此等缺口部26a之間把從凸輪軸18方向 觀察的斷面不平行（爲錐狀體）之標置板40插入，同時將 該標置板40以缸頭蓋5兩面推壓故能使搖臂軸26和標置板 40互相不搖幌地密接而固定。因此能夠防止搖臂軸26的鬆 - 10- (8) 1248491 動轉動之雜音的發生和軸承之磨損。並且將由缸頭蓋5把 標置板4 0推壓而固定，能夠省略在傳統之搖臂軸的止轉裝 置需要之標置板的鎖緊螺栓，螺孔加工工程，鎖緊工程， 在成本面也將成爲有利。 在本實施例，並且標置板40成爲挾入凸輪軸座20之狀 ，將限制標置板4 0的凸輪軸1 8方向位置，由搖臂軸2 6的軸 方向之偏位的磨損也將被防止。而且，將標置板4 0用已有 之凸輪軸座2 0固定，能夠不需要在缸頭4側施以特別的加 工，而將位置固定。 並且在本實施例，因在標置板40與凸輪軸座20之及， 及標置板40與缸頭蓋5內面之間，配置有如橡膠的彈性構 件42，故能確實固定標置板40。而且，缸頭蓋5之振動將 由彈性構件42將被吸收，振動所產生的噪音將被減低。 更且在本實施例，因標置板40之下抵接在凸輪軸軸承 19a的外環外側面，凸輪軸軸承19a將無搖幌，而會提高耐 久性。 [圖式簡單說明】 〔第1圖〕第1圖係將適用本發明的一實施例之內燃機 在略通過曲柄線與缸軸線的平面切斷之縱斷面圖。 〔第2圖〕第2圖係同樣地在略通過缸軸線和曲柄軸線 正交的平面切斷之縱斷面圖。 〔第3圖〕係同樣地在凸輪鏈附近與曲柄軸線正交的 平面切斷之縱斷面圖。 -11 - (9) 1248491 〔第4圖〕第4圖係將第1圖的上部擴大顯示之圖。 〔第5圖〕第5圖係將缸頭蓋拆卸而把缸頭從上方觀察 之圖。 〔第6圖〕第6圖係第5圖之VI—VI端視斷面圖。 〔第7圖〕第7圖係第4圖，第6圖之VII — VII端視斷面 圖。 〔第8圖〕第8圖係顯示過去的搖臂軸之止轉裝置的一 例之圖。 〔主要元件對照表〕1248491 (1) Description of the Invention [Technical Field of the Invention] The present invention relates to a rotation preventing device for a rocker shaft of a valve device of an internal combustion engine. [Prior Art] A stopper for preventing the fall of the rocker shaft that has been pressed into the rocker shaft hole has been disclosed (for example, refer to Patent Document i). Further, there is also a rotation preventing device for the rocker shaft as shown in Fig. 8. In this system, between the two rocker shafts 0 2 6 , the central part of the index plate 0 4 0 is screwed at the cylinder head 〇 4 with the locking bolt 0 2 3, and will be on the left and right arms of the index plate 040. The both ends of the both ends are symmetrically formed such that the rotation preventing portion 040a abuts against the notch portion 26a of the two rocker shafts 026, and the rocker shafts 02 6 are stopped. Further, reference numeral 〇18 in Fig. 8 denotes a camshaft, and 019 denotes a camshaft bearing. [Patent Document 1] 曰本开开 2000-329002 (paragraph 〇〇41, Fig. 6 and Fig. 7) [Summary of the Invention] [Problems to be solved] The above-mentioned conventional rocker shaft rotation preventing device When the indexing plate 040 is locked with the locking bolt 〇2 3, it will rotate in the locking direction due to the indexing plate 〇4 '' will be in the rear side of the locking rotation direction (left side in Fig. 8) A gap S is formed between the notch portion 0 2 6 a of one of the rocker shafts 02 6 and the rotation stop portion 040 & amp of the index plate 040 to generate (2) (2) 12448491. Therefore, in the operation of the internal combustion engine, there is a problem that noise is generated by the loose rotation of the rocker shaft 026 due to the gap s. [Means for Solving the Problems and Effects] In order to solve the above-mentioned problems in the past, the invention of the first application of the patent scope is based on the gap between the rocker arm shafts in the head of the internal combustion engine. The cam and the suction/exhaust valve are respectively connected to the rocker shaft, and the rocker shaft is respectively supported as a swingable internal combustion engine valve device, and each of the pair of rocker shafts forms a mutually opposite notch Between these missing portions, a restriction member that is not parallel to the cross section viewed from the camshaft direction is inserted into a rotation preventing device that presses the restriction member from the inner surface of the cylinder head cover into a rocker shaft. The invention of claim 1 is constructed as described above, and a restriction member that is not parallel to the cross section viewed from the camshaft direction is inserted between the mutually opposing notches of the gravitational axis, because the restriction member is made of a cylinder The inner surface of the head cover is piled up so that the rocker arm shaft and the restricting member can be fixed in close contact without being shaken. Therefore, it is possible to prevent the occurrence of noise caused by the loose rotation of the rocker shaft and the wear of the bearing. In addition, the lock bolts for the restraining members required for the conventional rocker arm shaft rotation preventing device can be omitted because the cylinder head cover is pressed by the restricting member, and the screw hole processing work and the locking work will become the cost side. advantageous. According to the invention of the first aspect of the invention, the invention is characterized in that the restricting member is formed into a shape in which a convex portion in the cylinder head is inserted in the direction of the cam shaft. Thus, in the invention of claim 2, since the position of the cam shaft direction of the restricting member is restricted by the shape in which the convex portion in the cylinder head (3) 1248491 is inserted, the axial direction of the rocker shaft can be prevented. The wear caused by the offset. Further, the restricting member is fixed by the existing convex portion, and no special processing is required on the cylinder head side, and the position can be fixed. The invention of claim 2 is the invention of claim 2, wherein the restriction member and the inner surface of the cylinder head cover are disposed between the restricting member and the convex portion. Elastic member. Thus, in the invention of claim 3, since the restricting member is fixed by the elastic member, the restricting member can be surely fixed. Also, the vibration of the head cap will be absorbed by the elastic member, so the noise by the vibration will be reduced. The invention of claim 4, wherein the convex portion is a cam shaft seat, and the restricting member abuts on the cam shaft, in the invention according to any one of the preceding claims The outer side of the bearing is characterized. Thus, according to the invention of claim 4, the restriction member is fixed at the cam seat position, and the position of the camshaft bearing is also fixed, so that the swaying condition of the camshaft bearing will disappear, and the camshaft bearing is improved. Durability. [Embodiment] [Embodiment of the Invention] Fig. 1 is a longitudinal sectional view showing an internal combustion engine to which an embodiment of the present invention is applied, which is slightly cut through a plane of the crankshaft axis and the cylinder axis. FIG. 2 is a longitudinal cross-sectional view of the third section which is cut in a plane perpendicular to the crank axis, and is similarly cut in a plane perpendicular to the crank axis in the vicinity of the cam chain. In the cross-sectional view, Fig. 4 is a view showing an enlarged upper portion of the first drawing. The internal combustion engine 1, the head valve type 4-stroke cycle single-cylinder internal combustion engine, the body 'by: left and right divided left crank case 2 a, right crank case 2 b, and cylinder block 3, and cylinder head 4, and cylinder head cover 5 , and the left crank case cover 6 a, and the right crank case cover 6b. The left crank case 2a and the right crank case 2b are combined with each other, and the cylinder block 3, the cylinder head 4, and the cylinder head cover 5 are sequentially superposed thereon. Further, a left crank case cover 6a is provided on the left side surface of the left crank case 2a, and a right crank case cover 6b is provided on the right side surface of the right crank case 2b, and they are respectively combined. Then, the left and right crankcases 2a, 2b, the cylinder block 3, the cylinder head 4, the cylinder head cover 5, the left crankcase cover 6a, and the right crankcase cover 6b are integrally coupled to each other by bolts or the like. Further, as shown in Fig. 1 and Fig. 2, the piston 8 is slidably fitted in the cylinder bore 7 formed in the cylinder block 3, and the crankshaft 9 is shaft-mounted on the left and right crankcases 2a, 2b. The support is rotatable. Then, at both the piston 8 and the crank shaft 9, via the piston pin 10 and the crank pin 1, respectively, both ends of the link 1 2 are pivotally mounted to be rotatable. As described above, when the piston 8 reciprocates by the combustion of the mixture in the combustion chamber 13 at the top of the cylinder bore 7, the crankshaft 9 is rotationally driven. Further, an intake port 14 and an exhaust port that communicate with the combustion chamber 13 at the top of the cylinder bore 7 are formed in the cylinder head 4, and the suction port 14 and the exhaust port 15 are suctioned. The gas valve 16 and the exhaust valve 17 are opened and closed (refer to Fig. 2 (5) 1248491. Then, the cam shaft 18 is disposed adjacent to the tips of the intake valve 16 and the exhaust valve 17. One end portion of the cam shaft 18 (in FIG. 1 and FIG. 4 is a left end portion) is rotatably supported by the cylinder head 4 and the cam shaft housing 20 via the camshaft bearing 19 a, and the other end The part (in the first figure, the fourth figure is the right end) is rotatably supported by the cylinder head 4 via the camshaft bearing 1 9 b. At the one end of the cam shaft 18, there is a driven sprocket 2 1 and the magnet holders 2 2 are sequentially stacked to be integrally mounted with the bolts 23. On the one hand, the drive shafts 24 are integrally provided on the crank shaft 9, and the drive sprocket 24 and the above-described driven sprocket 2 1 are integrally provided. It is mounted with a circulating cam chain 2 5. And as shown in Fig. 2, there is a pair of rocker arms in the middle of the top of the suction valve 16 and the exhaust valve 17 and above the cam shaft 18. Axis 2 6, so The axes are arranged horizontally, and both ends are fitted to the cylinder head 4 and the camshaft seat 20. In this pair of rocker shafts 26, respectively, the rocker arms 28 are pivotally supported to be freely rockable. One end of the rocker arm 28 is pivotally mounted with a roller 2 9 to abut the cam mountain 18 8 ' of the camshaft 18 and the other end abuts against the suction valve 1 6 and the exhaust valve 17 respectively. Thus, during the operation of the internal combustion engine 1, the rotational speed of one half of the crankshaft 9 will be rotated. The camshaft 18 is rotationally driven, the intake valve 16 and the exhaust valve 17 will be rotated every 2 turns on the crankshaft 9. In this case, the magnet holders 2 are integrally opened and closed once, and as shown in Figs. 1 and 4, the magnet holder 2 2 integrally attached to one end (the left end of the figure) of the cam shaft 18 is located. The position on the inner diameter side of the driven sprocket 2 1 is formed into a cylindrical shape having a small diameter, and is formed into a cylindrical shape having a large diameter at the outer side thereof. Then, in the large-diameter cylindrical portion thereof (6) 1248491 The inner peripheral surface is provided with a plurality of permanent magnetic packages at equal intervals in the circumferential direction. Further, outside the cam shaft 18 (in the first figure), a cooling water pump 3 0 is disposed. The opening formed by the side wall of the pump head 4 of the cooling water pump 30 is closely fitted to the pump cover 31. The cylindrical portion of the pump body 32 is stored in the large-diameter cylindrical portion. The pump shaft 33 is disposed on the axis, and both ends thereof are freely rotated and the pump body 32. The pump shaft 33 is embedded with a rotor 34, a cylindrical portion, relative to the magnet holder 2 2 The permanent magnet 36 is integrally attached to the position of the integral portion 35. The outer portion of the cylindrical portion (the left side of Fig. 4) of the 3 4 is formed. When the driven sprocket 2 1 is rotationally driven, The seat 22 will rotate, and the rotor 34 of the cooling water pump 30, the permanent magnet 36, will rotate with the magnet holder 22 forever, and the cooling water pump 30 will be rotationally driven. Next, Fig. 5 is a cross-sectional view of the cylinder head cover 5 with the cylinder head cover 5 removed, and Fig. 6 is a cross-sectional view taken along line VI-VI of Fig. 5 and a sectional view taken along line VII-VII of Fig. 6. In the present embodiment, each of the left ends of the pair of rocker shafts 26 and the lower end of the pair of rocker shafts 26 are formed to be mutually compatible. Then, between the notch portions 2 6 a, the cross-section of the section viewed in the direction of the direction of the figure 8 8 is parallel (the taper in the figure 6 is a target plate 4 〇) as a limiting member. The iron 35 is integrally attached to the left side of the fourth drawing. The cover 3 1 is fitted to the base end of the cylinder pump body 3 2 and is formed to be fitted to the magnet cover 2 2 by the rotation of the cam shaft 18 in the pump cover 3 The magnetic force I 4 of the permanent magnet 35 mounted on the magnet of the rotor 34 and attached to the magnet body integrally integrated with the rotor piece 37 is viewed from above. In the figure, the S portion (shown in Fig. 5 is the notch portion 26a of the facet, and is inserted from the cam shaft toward the lower side of the camshaft. The -9-(7)(7)1248491 standard plate 4 Ο As shown in Figs. 4 and 6, the lower end abuts against the outer side surface of the outer ring of the camshaft bearing 19a, and the upper portion is bent toward the camshaft seat 20 which is horizontally bent toward the convex portion in the cylinder head 4. It extends upward and is bent downward to become the shape of the camshaft seat 20. Moreover, between the indexing plate 40 and the camshaft seat 2, and the inner surface of the indexing plate 40 and the cylinder head cover 5 between The elastic member 4 2 such as rubber is disposed, and is pressed by the cylinder head cover 5. Further, a dot chain line 42 A in Fig. 6 indicates a free-time shape of the elastic member 42, and when the cylinder head cover 5 is mounted It will be pressed to form the shape shown in Fig. 4. Moreover, the figure 27 of Fig. 5 and Fig. 7 is arranged so that the axial direction of the rocker shaft 28 is not biased. In such an internal combustion engine 1, when fuel is supplied to the combustion chamber 13. When the air mixture is ignited, the fuel will burn and the pressure of the combustion chamber 13 will rise, and the piston 8 will be depressed. The valve 16 and the exhaust valve 17 are operated, and the exhaust and ignition are repeatedly performed in a predetermined sequence and timing, and the piston 8 will reciprocate. This movement of the piston 8 will become the rotation of the crankshaft 9 via the connecting rod 12. Further, it is transmitted to a wheel or the like (not shown). The rotation of the crankshaft 9 is transmitted to the camshaft 1 via the drive sprocket 24, the cam chain 25, the driven sprocket 2, and the cam mountain 1 8 a. The rocker arm 2 8 opens and closes the intake valve 16 and the exhaust valve 17 in a predetermined order and timing. A notch portion 26a facing each other is formed at one end of one pair of rocker shafts 26, and the cross-section of the cross-sectional portion 26a viewed from the direction of the cam shaft 18 is not parallel (conical) When the plate 40 is inserted and the index plate 40 is pushed on both sides of the cylinder head cover 5, the rocker arm shaft 26 and the index plate 40 can be fixed in close contact with each other without being shaken. Therefore, the looseness of the rocker shaft 26 can be prevented. - (8) 1248491 The occurrence of the noise of the rotating motion and the wear of the bearing, and the fixing of the indexing plate 40 by the cylinder head cover 5 is fixed, and the positioning plate required for the rotation preventing device of the conventional rocker shaft can be omitted. Locking bolts, screw hole machining engineering, and locking engineering will also be beneficial in terms of cost. In the present embodiment, the indexing plate 40 is shaped to be inserted into the camshaft seat 20, and the position of the camshaft 18 in the direction of the indexing plate 40 is restricted, and the offset of the axial direction of the rocker shaft 26 is also Will be prevented. Further, by fixing the index plate 40 to the existing cam shaft base 20, it is possible to fix the position without performing special machining on the cylinder head 4 side. Further, in the present embodiment, since the elastic member 42 such as rubber is disposed between the index plate 40 and the cam shaft base 20, and between the index plate 40 and the inner surface of the cylinder head cover 5, the index plate 40 can be surely fixed. . Moreover, the vibration of the cylinder head cover 5 will be absorbed by the elastic member 42, and the noise generated by the vibration will be reduced. Further, in the present embodiment, since the underside of the index plate 40 abuts against the outer side surface of the outer ring of the camshaft bearing 19a, the camshaft bearing 19a will be free from rattling, which will improve durability. [Brief Description of the Drawings] [Fig. 1] Fig. 1 is a longitudinal sectional view showing an internal combustion engine to which an embodiment of the present invention is applied, which is cut slightly through a plane of a crank line and a cylinder axis. [Fig. 2] Fig. 2 is a longitudinal sectional view similarly cut along a plane orthogonal to the cylinder axis and the crank axis. [Fig. 3] is a longitudinal sectional view similar to the plane cut perpendicular to the crank axis in the vicinity of the cam chain. -11 - (9) 1248491 [Fig. 4] Fig. 4 is an enlarged view of the upper portion of Fig. 1. [Fig. 5] Fig. 5 is a view in which the cylinder head cover is removed and the cylinder head is viewed from above. [Fig. 6] Fig. 6 is a cross-sectional view taken along line VI-VI of Fig. 5. [Fig. 7] Fig. 7 is a fourth sectional view, and Fig. 6 is a sectional view taken along line VII-VII. [Fig. 8] Fig. 8 is a view showing an example of a conventional rocker shaft rotation preventing device. [Main component comparison table]
1 內 燃 機 2a 左 曲 柄 A-A- 相 2b 右 曲 柄 箱 3 氣 紅 塊 4 氣 缸 頭 5 氣 缸 頭 蓋 6 a 左 曲 柄 箱 6b 右 曲 柄 箱 7 氣 缸 孔 8 活 塞 9 曲 柄 軸 10 活 塞 銷 11 曲 柄 銷 12 連 桿 -12- (10)1248491 13 燃燒室 14 吸氣口 15 排氣口 16 吸氣閥 17 排氣閥 18 凸輪軸 1 8 a凸輪山1 Internal combustion engine 2a Left crank AA-phase 2b Right crank box 3 Gas red block 4 Cylinder head 5 Cylinder head cover 6 a Left crank case 6b Right crank case 7 Cylinder hole 8 Piston 9 Crank shaft 10 Piston pin 11 Crank pin 12 Link -12 - (10)1248491 13 Combustion chamber 14 Suction port 15 Exhaust port 16 Intake valve 17 Exhaust valve 18 Camshaft 1 8 a Cam mountain
1 9 a、1 9 b 凸輪軸軸承 2 0 凸輪軸座 2 1 從動鏈輪 22 磁鐵座 23 螺栓 24 驅動鏈輪 25 凸輪鏈 2 6 搖臂軸1 9 a, 1 9 b Camshaft bearing 2 0 Camshaft seat 2 1 Driven sprocket 22 Magnet holder 23 Bolt 24 Drive sprocket 25 Cam chain 2 6 Rocker shaft
2 6a缺口部 28 搖臂 29 滾輪 3 0 冷卻水栗 3 1 泵蓋 32 泵體 3 3 泵軸 34 轉子 3 5' 36 永久磁鐵 -13- (11)1248491 37 葉片 40 標置板 42 彈性構件2 6a notch 28 rocker 29 roller 3 0 cooling water chestnut 3 1 pump cover 32 pump body 3 3 pump shaft 34 rotor 3 5' 36 permanent magnet -13- (11) 12448491 37 blade 40 index plate 42 elastic member
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