1285704 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種搖臂異音防止結構，尤指一種適用 於汽缸之搖臂異音防止結構。 5 【先前技術】 一般頂置凸輪軸式引擎，係採用位於汽缸頭内的凸輪 軸帶動凸輪旋轉，進而透過搖臂及閥門連桿控制進氣閥 門、排氣閥門之開啟與關閉，同時控制油氣進入汽缸之燃 10燒室内而加以燃燒，以及促使引擎順利運轉並進而將廢氣 排出。 15 為了正確控制油氣進入汽缸之燃燒室、以及促使引擎 運轉並進而將廢氣排出之正時作動，搖臂必須能夠精確傳 遞凸輪輪廓（Cam Profile)之揚程變化，以適時達成『進、壓、 爆、排』之内燃機引擎作動行程。 此外，由冷車狀態啟動引擎至熱車過程中，會導致汽 2=溫度急遽升高’此溫度落差所產生之熱脹冷縮效應 間二引擎汽紅頭之閥門間隙產生變化’並因此容易造成 閥門開啟與關閉時’搖臂產生異音。 裂―广：，善此種搖臂異音之情形，習知的解決方式係加 之彈:預= 孔:支'凸緣’利用扭轉彈簧本身 圖；ΐ:圖Γ習知汽缸内部之搖臂異音防止結構立體 3中顯不有-習知之搖臂91，其中段係向外凸設有一 20 1285704 / — 支撐凸緣90。此外，一搖臂軸912,其係固設在汽缸頭内部。 支撐凸緣90中央係貫設有一搖臂軸孔9U，搖臂91係透過搖 ' 臂軸孔911而樞設在搖臂軸912上。在支撐凸緣90的兩端分 - 設有一凸輪端913、及一閥門端914。 5 為了防止汽缸内部之溫度落差所導致搖臂91之閥門端 914產生敲擊異音，習知作法是在支撐凸緣9〇上繞設一扭轉 彈簣92，利用扭轉彈簧92的彈性預力迫使搖臂91之閥門端 914長時頂抵於汽缸之閥門連桿（圖未示）、以避免搖臂91發 瞻出敲擊聲響、引發使用者不必要之疑慮。 10 然而，隨著引擎輕量化、體積小型化之設計趨勢，汽 缸亦需隨之減少體積以配合達成上述目的。搖臂的設計也 傾向縮小整體體積，去除掉原本外凸的支撐凸緣，以減少 搖臂整體體積、並同時達到輕量化以及減小轉動慣量的目 的。 15 因此’原先之搖臂異音防止結構勢必要重新設計，為 搖臂所產生之異音尋求根本解決之道。 【發明内容】 ^本發明係為一種搖臂異音防止結構，其係組設於一引 2〇擎之*汽缸丑員内。搖臂異音防止結構包括有至少一搖臂軸、 至少一搖臂、以及至少一扭轉彈性件。 其中，搖臂包括有一搖臂軸孔、一側面（他_)、 二凸，端一、以及:閥門端。又，上述之搖臂軸係固設在引 之’飞缸頭上’刖述搖臂軸孔係貫穿搖臂中段之側面、並 25 對應樞設於搖臂軸上。此外，访日丨工〆丄 此外，刖述側面係由搖臂軸孔之週 1285704 緣徑向平整延伸而出，凸輪端、 孔之兩端。 料肖閥門端係分設於搖臂軸 另外，上述之扭㈣性件係包括—螺旋段…搖臂端、 固定端。螺旋段係環繞套設於上述之搖臂軸上、且鄰 臂之侧面。搖臂端係自螺旋段之一端延伸而 2 =對應岐在搖臂上；以端係自螺旋段之另一端延 伸而出、並對應固定在汽缸頭上。 10 15 其中’扭轉彈性件係可提供—彈性預力促使該上述之 搖#以其對應樞設之搖臂轴為轴心、朝向一特定之第一方 向相對旋轉，以避免搖臂產生敲擊異音。 本發明藉由扭轉彈性件所具有特殊之螺㈣，可 對應環套並繞設在搖臂軸上，毋須定位於習知搖臂上之支 ’且更同時達成扭轉彈性件的定位、及以搖臂 為她力支點的目的。 另外，本發明能夠配合料輕量化所需之不具支撐凸 緣的搖臂設計，除了能夠達成習知搖臂異音防止結構之所 有功效外’更進—步配合達成搖臂輕量化、 及小型化之目的。 付初I貝里 其中’本發明之汽缸頭更可包括有一凸輪軸座，其係 支撐亚樞⑤有-凸輪軸。上述之扭轉彈性件之固定端係 固設於凸輪軸座上。 '、 此外，本發明之扭轉彈性件之搖臂端係可對應跨設固 定在搖臂上、鄰近於閥門端之處，俾形成較大之扭轉力矩。 20 1285704 ，但扭轉彈性 當然，亦可跨設固定於搖臂鄰近於凸輪端處 件係具有一反向之扭力。 冉者 奉發明之Η缸頭内更可包括 桿，其係滑設於汽缸頭内、並進行軸 ）'一閥門連 aa 丁季由向的往復運動，B品 閥門連桿具有一桿頂端。此外，上述特定， 扭轉彈性件所提供之彈性預力俜為一預壓 °係指 BB 斤I 了只刀你马預壓力、並促使搖臂 之閥門端旋轉以趨近壓合於閥門連桿之桿頂端之方向 使搖臂之閱門端頂抵於間門連桿之桿頂端，消除因汽紅内 :之溫度^差導致搖臂之閥門端敲擊閥門連桿之桿頂端所 座之異曰。 此外，承上所述，上述特定之第一方向亦可指扭轉彈 性件之彈性預力係為一預張力、並促使搖臂之閥門端旋轉 以撐張遠離於閥門連桿之桿頂端之方向。進而促使上述之 至少一凸輪軸之至少-凸輪、與搖臂之凸輪端之間的間距 15 為零。 再且，本發明之搖臂更具有一凸輪滚輪，其係樞設在 凸輪端上，並與上述之凸輪形成滾動接觸、減低能量耗損 及接面磨耗。 ' 此外，本發明之扭轉彈性件係可為一扭轉彈簧、或其 2〇 他等效扭轉彈性體亦可。 最後，本發明之搖臂係可具有一進氣搖臂、及一排氣 搖臂，俾配合四行程環保引擎之作動。 1285704 【實施方式】 凊一併參閱圖1、圖2、及圖3係本發明一較佳實施例組 衣於引擎内部之剖視圖、圖1局部放大之示意圖、及本發明 一較佳實施例組立之立體圖。 5 如圖1所示，一種搖臂異音防止結構係組設於引擎之一 汽缸頭1内。在本實施例中，汽缸頭丨係以一可分離式之汽 缸頭來做說明，汽缸頭丨係包括有一汽缸頭本體丨〗、及一汽 缸頭蓋12二部分。汽缸頭本體u係組設有一凸輪軸座ι〇， 其係支撐並樞設有一凸輪軸2(如圖2所示）；凸輪軸2並徑向 10 凸設有二凸輪21。 其中，本實施例之汽缸頭本體n内係滑設有二個閥門 連杯4，分別為一排氣閥連桿41、及一進氣閥連桿42，其係 分別在汽缸頭本體11内進行軸向往復運動。 此外，對應排氣閥連桿41、及進氣閥連桿42，汽叙頭 15本體11内組設有一排氣搖臂31、及一進氣搖臂32。排氣搖 臂3 1、及進氣搖臂32係分別樞設在固設於汽缸頭本體丨^上 之二搖臂軸3上，而能夠以搖臂軸3為軸心不停左右旋轉擺 動，以傳遞凸輪軸2之動力至排氣閥連桿41、及進氣閥連桿 42,進而使引擎之燃燒室順利完成進氣、及排氣之行程。 20 請再一併參閱圖2、及圖3，以位於左邊之排氣搖臂31 為例，本發明之搖臂異音防止結構主要包括有一搖臂軸3、 一排氣搖臂3 1、及一扭轉彈性件5。 其中，排氣搖臂31包括有一搖臂軸孔31〇、一側面]^、 一凸輪端311、及一閥門端312(如圖3所示）。搖臂軸孔3ι〇 1285704 ? 貫穿側面319之中段處、並對應樞設於搖臂軸3上。侧面319 係由搖臂軸孔310之週緣徑向平整延伸而出；而凸輪端 311、與閥門端312係分別設置於搖臂軸孔31〇之兩端。 此外，扭轉彈性件5在本實施例中係為一扭轉彈簧 5 500 ’其係可提供一彈性預力P。當然，視使用者需要扭轉 彈性件5亦可採用其他等效彈性體作為替代，在此不再贅 述。 其中，扭轉彈簧500包括一螺旋段50、一搖臂端51、及 • 一固定端52(如圖3所示）。螺旋段50係環繞套設於搖臂軸3 10 上、且鄰近於排氣搖臂31之側面319。搖臂端51係自螺旋段 50—端延伸而出、並固定於排氣搖臂31上。固定端52係自 螺旋段50另一端延伸而出、並固設於汽缸頭本體丨丨之凸輪 軸座10上。 如此，扭轉彈簧500係可提供一彈性預壓力p卜促使排 15 氣搖臂3 1以其對應樞設之搖臂軸3為軸心、而朝向一特定之 第一方向A相對旋轉（如箭號所示之方向），進而讓排氣搖臂 φ 31之閥門端312旋轉以趨近長時間壓合於閥門連桿4之一桿 頂端40(如圖2所示），以避免產生敲擊異音。 藉此，扭轉彈簧5〇〇之螺旋段50可直接對應環套繞設在 20 搖臂軸3上以作為施力支點，毋須定位於習知搖臂上之支撐 凸緣’可同時達成扭轉彈簧5〇〇的定位、及以搖臂軸3作為 施力支點的目的。除了能達成習知搖臂異音防止結構所有 功效之外，更進一步配合達成搖臂輕量化、及小型化之目 的0 1285704 • 其中，如圖3所示，本實施例之扭轉彈簧500之搖臂端 _ 51係對應跨設固定於排氣搖臂31上、且鄰近於閥門端312之 處，俾形成較大之力矩。當然，視需要扭轉彈簧之搖臂端 ' 亦可跨設鄰近於搖臂之凸輪端，但是扭轉彈簧係提供一反 5 向扭力。 另外，本實施例之扭轉彈簧500所提供之彈性預力？亦 可為一預張力P2’促使排氣搖臂31以其對應樞設之搖臂軸3 為軸心、而朝向一特定之第一方向B相對旋轉（如圖3所示箭 9 號B之方向）。促使排氣搖臂31之閥門端312旋轉以撐張遠離 10閥門連桿4之桿頂端40(圖未示），而使凸輪轴2之凸輪21、盘 排氣搖臂31之凸輪端311之間之間距為零（如圖2所示），俾能 有效傳遞凸輪軸之旋轉動力。 此外，如圖3所示，本實施例之排氣搖臂31係包括一凸 輪滾輪314,其係樞設於凸輪端311上，俾與凸輪Η形成滚 15 動接觸、減低能量耗損。 上述實施例僅係為了方便說明而舉例而已，本發明所主 • ^之權利範圍自應以申請專利範圍所述為準，而㈣限於 上述實施例。 升1皇I氏7、 20 【圖式簡單說明】 擎内部之剖視圖 圖1係本發明一較佳實施例組裝於引 圖2係圖1局部放大之示意圖。 圖3係本發明一較佳實施例組立之立體圖。 圖4係習知汽缸内部之搖臂異音防止結構立體圖 11 12857()4 【主要元件符號說明】 汽叙頭1 凸輪軸座10 、汽k頭蓋12 凸輪軸2 搖臂軸3,912 排氣搖臂31 凸輪端311，913 閥門端312,914 側面3 19 進氣搖臂32 桿頂端40 排氣閥連桿41 扭轉彈性件5 螺旋段5 0 搖臂端5 1 搖臂91 固定端52 汽缸頭本體11 凸輪21 搖臂軸孔310,911 凸輪滾輪314 閥門連桿4 進氣閥連桿42 扭轉彈簧500,92 支撐凸緣901285704 IX. Description of the Invention: [Technical Field] The present invention relates to a rocker arm noise prevention structure, and more particularly to a rocker arm noise prevention structure suitable for a cylinder. 5 [Prior Art] The general overhead camshaft engine uses a camshaft located in the cylinder head to drive the cam to rotate, and then controls the opening and closing of the intake valve and the exhaust valve through the rocker arm and the valve connecting rod, and simultaneously controls the oil and gas. It enters the combustion chamber of the cylinder and burns it, and causes the engine to run smoothly and then exhausts the exhaust gas. 15 In order to properly control the combustion of the oil and gas into the combustion chamber of the cylinder, as well as the timing of the engine to operate and then exhaust the exhaust gas, the rocker arm must be able to accurately transmit the head change of the Cam Profile to achieve the "in, pressure, explosion" The engine of the internal combustion engine is operated. In addition, starting the engine from the cold state to the hot car process will cause the steam 2 = temperature to rise sharply. 'The temperature expansion and contraction effect caused by this temperature drop will change the valve clearance of the two engine steam red heads' and thus easily cause When the valve is opened and closed, the rocker arm produces an abnormal sound. Split-wide: In the case of such a rocker's abnormal sound, the conventional solution is to add a bullet: Pre-hole: the 'flange' uses the torsion spring itself; ΐ: Figure Γ The inner rocker of the cylinder The abnormal sound prevention structure stereo 3 is not shown - the conventional rocker arm 91, wherein the segment is convexly provided with a 20 1285704 / - support flange 90. In addition, a rocker shaft 912 is fixed inside the cylinder head. A rocker arm shaft hole 9U is integrally formed in the center of the support flange 90, and the rocker arm 91 is pivotally mounted on the rocker arm shaft 912 through the rocker arm shaft hole 911. At both ends of the support flange 90, a cam end 913 and a valve end 914 are provided. 5 In order to prevent the temperature drop inside the cylinder from causing a knocking abnormal sound at the valve end 914 of the rocker arm 91, it is conventional practice to wind a torsion magazine 92 on the support flange 9〇, using the elastic preload of the torsion spring 92. The valve end 914 of the rocker arm 91 is forced to abut against the valve connecting rod of the cylinder (not shown) to prevent the rocker arm 91 from making a knocking sound, causing unnecessary doubts of the user. 10 However, with the design trend of lighter weight and smaller size, the cylinders need to be reduced in size to meet the above objectives. The design of the rocker arm also tends to reduce the overall volume and remove the original convex support flange to reduce the overall volume of the rocker arm while achieving weight reduction and reducing the moment of inertia. 15 Therefore, the original rocker noise prevention structure is necessary to be redesigned to seek a fundamental solution for the abnormal sound generated by the rocker arm. SUMMARY OF THE INVENTION The present invention is a rocker arm noise prevention structure which is assembled in a cylinder stalker. The rocker arm noise prevention structure includes at least one rocker arm shaft, at least one rocker arm, and at least one torsion elastic member. The rocker arm includes a rocker arm shaft hole, a side surface (he), a second protrusion, an end one, and a valve end. Further, the above-mentioned rocker arm shaft is fixed to the 'flying cylinder head'. The rocker arm shaft hole is inserted through the side surface of the middle portion of the rocker arm, and is pivotally disposed on the rocker arm shaft. In addition, the visit to the 丨 丨 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 〆丄 1 1 1 285 285 285 285 285 285 285 285 285 The shaft end of the valve is divided into the rocker shaft. In addition, the above-mentioned twisted (four) members include a spiral section, a rocker end, and a fixed end. The spiral section is wrapped around the rocker shaft and on the side of the adjacent arm. The rocker end extends from one end of the spiral section and 2 = corresponds to the rocker arm; the end is extended from the other end of the spiral section and is correspondingly fixed to the cylinder head. 10 15 wherein the 'torsion elastic member can provide-elastic pre-force to cause the above-mentioned rocking arm to rotate relative to a specific first direction with its corresponding pivoting rocker axis as an axis to avoid the rocker arm striking Different sound. The invention has the special screw (4) of the torsion elastic member, can be corresponding to the ring sleeve and is disposed on the rocker arm shaft, and does not need to be positioned on the branch of the conventional rocker arm, and at the same time achieves the positioning of the torsion elastic member, and The rocker arm is the purpose of her fulcrum. In addition, the present invention is capable of matching the rocker arm design without the support flange required for lightweighting of the material, in addition to achieving all the functions of the conventional rocker arm noise prevention structure, and further improving the rocker arm weight reduction and small size. The purpose of the transformation. The first cylinder head of the present invention may further include a camshaft seat that supports the sub-bend 5-camshaft. The fixed end of the above-mentioned torsion elastic member is fixed to the cam shaft seat. In addition, the rocker end of the torsion elastic member of the present invention can be fixed to the rocker arm and adjacent to the valve end, and a large torsional moment is formed. 20 1285704, but torsional elasticity Of course, it is also possible to have a reverse torsion force that is fixed to the rocker arm adjacent to the cam end. In the cylinder head of the invention, the cylinder head may further include a rod which is slidably disposed in the cylinder head and performs a shaft. A valve is connected to a reciprocating movement of the quarter, and the valve connecting rod has a rod tip. In addition, in the above specific, the elastic pre-stress provided by the torsion elastic member is a pre-pressure, which means that the BB is a knife and the pressure of the valve is rotated to push the valve end of the rocker arm to approach the valve connecting rod. The direction of the top end of the rod makes the top end of the rocker arm abut against the top end of the door connecting rod, eliminating the temperature difference in the steam red: the valve end of the rocker arm hits the top end of the valve connecting rod Different. In addition, as described above, the specific first direction may also mean that the elastic pre-stress of the torsion elastic member is a pre-tension, and the valve end of the rocker arm is rotated to extend away from the tip end of the valve connecting rod. . Further, the spacing 15 between at least the cam of the at least one camshaft and the cam end of the rocker arm is made zero. Moreover, the rocker arm of the present invention further has a cam roller pivotally disposed on the cam end to form rolling contact with the cam to reduce energy consumption and joint wear. Further, the torsion elastic member of the present invention may be a torsion spring, or a double twist equivalent elastic body thereof. Finally, the rocker arm of the present invention can have an intake rocker arm and an exhaust rocker arm that cooperate with a four-stroke eco-engine. 1285704 [Embodiment] Referring to Figure 1, Figure 2, and Figure 3, a cross-sectional view of a preferred embodiment of the present invention in the interior of the engine, a partially enlarged view of Figure 1, and a preferred embodiment of the present invention Stereo view. 5 As shown in Fig. 1, a rocker arm noise prevention structure is assembled in one of the cylinder heads 1 of the engine. In the present embodiment, the cylinder head cymbal is described by a detachable cylinder head, which includes a cylinder head body 、 and a cylinder head cover 12 in two parts. The cylinder head body u is provided with a cam shaft seat ι which supports and pivots a cam shaft 2 (shown in FIG. 2); the cam shaft 2 is convexly disposed with two cams 21 in the radial direction. In the cylinder head body n of the embodiment, two valve connecting cups 4 are respectively disposed, which are respectively an exhaust valve connecting rod 41 and an intake valve connecting rod 42 respectively in the cylinder head body 11 Perform axial reciprocating motion. In addition, corresponding to the exhaust valve connecting rod 41 and the intake valve connecting rod 42, an exhaust rocker arm 31 and an intake rocker arm 32 are disposed in the main body 11 of the steam head 15 . The exhaust rocker arm 3 1 and the intake rocker arm 32 are respectively pivoted on the two rocker shafts 3 fixed on the cylinder head body ,, and can swing around the rocker shaft 3 as a shaft center. The power of the camshaft 2 is transmitted to the exhaust valve connecting rod 41 and the intake valve connecting rod 42 to further complete the intake and exhaust strokes of the combustion chamber of the engine. 20, please refer to FIG. 2 and FIG. 3 together. Taking the exhaust rocker arm 31 on the left as an example, the rocker arm noise prevention structure of the present invention mainly includes a rocker arm shaft 3 and an exhaust rocker arm 3 1 . And a torsion elastic member 5. The exhaust rocker arm 31 includes a rocker arm shaft hole 31, a side surface, a cam end 311, and a valve end 312 (shown in FIG. 3). The rocker shaft hole 3ι〇 1285704 ? is inserted through the middle portion of the side surface 319 and correspondingly pivoted on the rocker shaft 3. The side surface 319 is radially extended by the periphery of the rocker shaft hole 310; and the cam end 311 and the valve end 312 are respectively disposed at both ends of the rocker shaft hole 31. Further, the torsion elastic member 5 is a torsion spring 5 500 ' in this embodiment which is capable of providing an elastic preload force P. Of course, other equivalent elastomers may be used instead of the elastic member 5 as needed, and will not be described herein. The torsion spring 500 includes a spiral segment 50, a rocker end 51, and a fixed end 52 (shown in Figure 3). The spiral section 50 is wrapped around the rocker shaft 3 10 and adjacent to the side 319 of the exhaust rocker arm 31. The rocker end 51 extends from the end of the spiral section 50 and is fixed to the exhaust rocker arm 31. The fixed end 52 extends from the other end of the spiral section 50 and is fixed to the cam shaft base 10 of the cylinder head body 。. In this way, the torsion spring 500 can provide a resilient pre-pressure p urging the row 15 of the rocker arm 3 1 with its corresponding pivoting rocker shaft 3 as the axis, and relatively rotate toward a specific first direction A (such as an arrow) The direction indicated by the number), and then the valve end 312 of the exhaust rocker arm φ 31 is rotated to be pressed close to the rod tip 40 of the valve link 4 for a long time (as shown in FIG. 2) to avoid knocking. Different sound. Thereby, the spiral section 50 of the torsion spring 5 can be directly arranged on the 20 rocker shaft 3 as the fulcrum of the fulcrum, and the support flange which is not required to be positioned on the conventional rocker arm can simultaneously achieve the torsion spring The positioning of 5〇〇 and the purpose of using the rocker shaft 3 as the fulcrum. In addition to achieving all the functions of the conventional rocker arm noise prevention structure, it further cooperates with the purpose of achieving weight reduction and miniaturization of the rocker arm. 0 1285704. Wherein, as shown in FIG. 3, the torsion spring 500 of the present embodiment is shaken. The arm end _ 51 is correspondingly fixed to the exhaust rocker arm 31 and adjacent to the valve end 312, and the 俾 forms a large torque. Of course, the rocker end of the torsion spring can be erected as needed to straddle the cam end adjacent to the rocker arm, but the torsion spring provides a reverse five-way torque. In addition, the elastic preload provided by the torsion spring 500 of the present embodiment? Alternatively, the pre-tensioning force P2' causes the exhaust rocker arm 31 to rotate relative to the pivot axis 3 corresponding to the pivoting axis 3 toward a specific first direction B (as shown in FIG. 3, arrow 9B). direction). The valve end 312 of the exhaust rocker arm 31 is caused to rotate to extend away from the rod tip 40 (not shown) of the 10 valve link 4, and the cam 21 of the camshaft 2 and the cam end 311 of the disk exhaust rocker arm 31 are The distance between the two is zero (as shown in Figure 2), and the 俾 can effectively transmit the rotational power of the camshaft. In addition, as shown in FIG. 3, the exhaust rocker arm 31 of the present embodiment includes a cam roller 314 which is pivotally disposed on the cam end 311 to form a roller 15 contact with the cam bore to reduce energy consumption. The above-described embodiments are merely examples for convenience of description, and the scope of the present invention is intended to be limited to the scope of the claims, and (4) is limited to the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially enlarged view of a preferred embodiment of the present invention. FIG. Figure 3 is a perspective view of a preferred embodiment of the present invention. Fig. 4 is a perspective view of a rocker arm noise prevention structure inside a conventional cylinder. Fig. 11 12857() 4 [Description of main component symbols] Steam head 1 Camshaft seat 10, steam k head cover 12 Camshaft 2 Rocker shaft 3, 912 Exhaust rocker arm 31 Cam end 311, 913 Valve end 312, 914 Side 3 19 Intake rocker arm 32 Rod top 40 Exhaust valve connecting rod 41 Torsion elastic member 5 Spiral section 5 0 Rocker end 5 1 Rocker arm 91 Fixed end 52 Cylinder head body 11 Cam 21 rocker shaft hole 310, 911 cam roller 314 valve connecting rod 4 intake valve connecting rod 42 torsion spring 500, 92 support flange 90
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