311967 A7 B7 五、發明説明（） 發明背景 本發 機自動減 氣凸輪之 動地位於 上設有呈 輪間置設 時，滑動 之排氣搖 於第二曲 此，藉由 内之定位 明係有關一種使 壓裝置，尤指一 位置處設一殼體 第一位置或第二 弧狀之第一曲度 有一滑動元件， 元件位於第一曲 臂，而 度内， 本發明之凸輪軸 元件由第一位置 少具有 缸頭内 殼體内 ，並在 曲度， 當定位 其恰可 第二位 凸輪上 所産生 位置移 内，而 内之定 置，使 ，使排 而使機 用於至 種在汽 ，於該 位置處 及第二 其中， 度内， 件位於 開排氣 轉動時 向第二 二曲度 一動力汽缸之内燃 之凸輪軸上靠近排 有一定位元件可活 (請先閱讀背面之注意事項再填寫本頁) 裝- 訂 線 經濟部中央標準局員工消費合作社印製 當定位元 則無法頂 ,而當凸輪軸停 心力之作用，而 一曲度内，而再 燒室内之可燃氣 發動引擎。 先前技藝： 按， ,仍將受 縮行程期 軸方停止 ,直到活 止轉動時，殼體 又回復至第一位 次頂開排氣搖臂 體之壓力排出， 該定位 另在殼 元件位 頂開排 置時， 方之排 之離心 動，而 不再頂 位元件 滑動元 氣閥打 車騎士 元件之一端 體與排氣凸 於第一位置 氣凸輪上方 滑動元件位 氣搖臂，因 力，使殼體 使原位於第 住排氣搖臂 因不再受離 件又進入第 開，而將燃 可輕易地再 一般四行程之内燃機，其曲柄軸於内燃機熄火時 慣性力而繼缠旋轉一角度，直到曲柄軸於活_ ® 間，受到披壓编可燃氣賭之壓力反制時，該曲柄 旋鞞，此時，活塞受被壓縮可燃氣體，之，想力推@ 塞完全停止，進而使曲柄軸由其正常旋轉方向（ 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 311S67 經濟部中央標準局員工消費合作社印裝 A7 B7五、發明説明（） 順時針方向）之g方向！逆時針方向）回轉一角度。 當内燃機欲重新啓動時，此時由於活塞位於較低點之 位置，因此，内燃機於重新啓動之初，活塞將進行壓縮行 程，然，壓縮行程之進行，活塞須於汽缸内部向燃燒室移 動，請參照第一圔所示，使曲柄軸向上死點之位置旋轉當 活塞向燃燒室移動時，將承受燃燒室中之可燃氣體之壓力 即機車騎士於發動引擎時，須用力踩踏腳踏槓捍以克服燃 燒室中之可燃氣體之壓力，進而發動機車，對於大排氣量 之機車與一般擁有較小之腳踏槓桿之速克逹型機車而言， 往往造成機車騎士之不梗，實有予以改進之必要。 為改進上述習用裝置上之各種缺點，發明人乃秉持從 事該項行業多年之經驗，以及經過多次不斷地努力研究與 實驗，終於發展設計出本發明之使用於至少具有一動力汽 缸之内燃機自動減壓裝置。 本發明之主要目的，在提供一種使用於至少具有一動 力汽缸之内燃機自動減壓裝置，主要傜指在汽缸頭内之凸 輪軸靠近排氣凸輪之位置處設有一殼體，該殼體之開口偽 對應於排氣凸輪，另在殼體内有一可上下活動地位於第一 位置與第二位置之定位元件，該定位元件之一端上則設有 第一曲度及第二曲度，另在殼體與排氣凸輪間設有一滑動 元件，其中，當定位元件位於第一位置時，滑動元件位於 第一曲度内，其恰可頂開排氣凸輪上方之排氣搖臂，而當 定位元件位於第二位置時，滑動元件位於第二曲度内，則 無法頂開排氣凸輪上方之排氣搖臂，因此，當凸輪軸轉動 (請先閲讀背面之注意事項再填寫本頁) -裝· 線 本紙張尺度逍用中國國家橾準（CNS ) A4規格（210X297公釐） 經濟部中央標準局貝工消費合作社印製 Α7 Β7 五、發明説明（） 時，由於殼體會跟著轉動，而使殼體内之定位元件因離心 力之關偽，而使定位元件由第一位置處往上位移至第二位 置，使原位於第一曲度内之滑動元件進入第二曲度内，而 不再頂住排氣搖臂，而當凸輪軸停止轉動時，毂體内之定 位元件因不再受離心力之作用，而又回復至第一位置，使 滑動元件又進入第一曲度内，而再次頂開排氣搖臂，使排 氣閥打開，而將燃燒室内之可燃氣體之壓力排出，使機車 騎士可輕易地再發動引擎。 為使能對本發明之原理、特獻以及作動方式更為具體 的了解，Η舉實施例配合圖示説明如下： 圖示之簡單說明： 第一圖偽本發明之内燃機組合剖視圖。 第二圖偽本發明之立體分解圔。 第三圖偽本發明之移動臂側面示意圖。 第四圖偽本發明之組合示意_。 第五圖傜第四圖之部份剖視圔。 第六圖偽本發明之作動情形示意圖。 第七圖係第六圖之部份剖視圖。 第八圖傺本發明之另一實施例示意圖。 第九圔偽本發明之又一實施例示意圖。 詳細說明： 請參閲附圖所示，本發明偽一種「使用於至少具有一 動力汽缸之内燃機自動減壓裝置」，主要包括有一内燃機 及自動減壓裝置等構件所組成。 -5 - 本紙張尺度適用中國國家榡準（CNS ) Α4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) 装· 訂 311S67 A7 經濟部中央標準局員工消費合作社印製 B7五、發明説明（) 請參照第一圖所示，即本發明蓮用於機車之單缸往復 式四行程内燃機之具體實施例。 該内燃機像由具有汽缸1之引擎結構體所構成，於汽 缸1内設有一可沿該汽缸1之孔内徑往復滑移之活塞1 1 ,該活塞1 1底端樞設一連捍1 4 ,該連桿1 4之底端並 植接一曲柄軸1 3 ,俾該活塞1 1沿汽缸1之内孔徑上下 移動時，可進而帶動曲柄軸13作一旋轉蓮動。 汽缸頭2於活塞1 1上方，凹設有一燃燒室12,該 汽缸頭2之一側開設有一進氣通道2 1 ,另一側則開設有 一排氣通道22,該等進氣通道21及排氣通道22皆分 別貫通燃燒室1 2。另，設有一開/閉燃燒室之閥，該開 /閉燃燒室之閥傺包括有進氣閥2 3及排氣閥24,其中 ,進氣閥2 3與排氣閥2 4之閥頭部份偽分別經由進氣通 道21與排氣通道22,而突入燃燒室12頂端，另，進 氣閥2 3與排氣閥2 4之桿體部份則分別經由閥導件2 3 1、 241而産生軸向之滑動，且分別藉彈簧232、 2 4 2將閥體2 3、2 4推向一侧。 進氣閥23與排氣閥24之尾端，係分別接設一進氣 搖臂25與一排氣搖臂26,該等搖臂25、 26偽分別 以插銷251、 261而銷設於汽缸頭2中，俾搖臂25 、26可分別以插銷251、 261為支點，作一槓桿蓮 動，另，進氣搖臂25與排氣搖臂26之未連接閥體之另 一端，係分別抵壓於凸輪軸2 7之進氣凸輪2 7 1與排氣 凸輪272上，當進氣凸輪271 (排氣凸輪272)之 (請先聞讀背面之注意事項再填寫本頁) 裝.311967 A7 B7 V. Description of the invention () Background of the invention When the automatic air-reduction cam of the engine is located on the wheel, the exhaust of the slide shakes in the second song. Regarding a pressing device, in particular, a sliding element is provided at a first position or a second arc-shaped first curvature of the housing, the element is located within the first crank arm, and the camshaft element of the present invention is The first position is less in the inner casing of the cylinder head, and in the curvature, when it is positioned, it can be moved to the position generated on the second cam, and the inner position is set so that the row and the machine are used to the Steam, at this position and the second one, the part is located on the camshaft of the internal combustion camshaft of the second two-curvature one-power cylinder when the exhaust gas is rotating. There is a positioning element near the row (please read the note on the back first Please fill in this page for details)-Installation-The Ministry of Economic Affairs, Central Standards Bureau, Employee Consumer Cooperative printed the positioning element, but the positioning element cannot be lifted, and when the camshaft stops the force, within one degree, the combustible gas in the room is fired. lead . Previous skills: Press,, the shaft will still be stopped during the contraction stroke, until the life is turned, the casing returns to the first pressure to eject the exhaust rocker body, and the positioning is on the top of the shell element. When the row is placed, the centrifugal movement of the row of the square, and no longer the top component slides the air valve. One end of the air valve rider element and the exhaust are protruding above the first position. The shell makes the exhaust rocker arm that was originally located at the first place, because it no longer receives the part and enters the first opening, it can be easily re-ignited for a four-stroke internal combustion engine. The crank shaft rotates at an angle when the inertial force of the internal combustion engine is turned off. , Until the crankshaft is between the live_ ® and is counter-pressured by the pressure of the compressible flammable gamble, the crank rotates. At this time, the piston is compressed by the flammable gas. The crank shaft rotates from its normal direction (This paper scale is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) 311S67 Printed by the Ministry of Economy Central Standards Bureau Employee Consumer Cooperative A7 B7 V. Invention description () Clockwise The g direction! Counterclockwise) by an angle. When the internal combustion engine is about to restart, because the piston is at the lower point, the piston will perform a compression stroke at the beginning of the restart. However, the piston must move to the combustion chamber inside the cylinder during the compression stroke. Please refer to the first picture, rotate the crankshaft to the top dead center position. When the piston moves toward the combustion chamber, it will bear the pressure of the combustible gas in the combustion chamber. In order to overcome the pressure of the combustible gas in the combustion chamber and then the engine locomotive, for large-displacement locomotives and quick-speed locomotives that generally have smaller foot levers, they often cause the locomotive rider to stop. The need for improvement. In order to improve the various shortcomings of the above-mentioned conventional devices, the inventor upholds many years of experience in this industry, and after many continuous hard research and experiments, he finally developed and designed the invention to be used in an internal combustion engine with at least one power cylinder Pressure relief device. The main object of the present invention is to provide an automatic decompression device for an internal combustion engine having at least one power cylinder. The main point is to provide a casing at the position of the camshaft in the cylinder head close to the exhaust cam, the opening of the casing Pseudo-corresponding to the exhaust cam, there is also a positioning element in the housing that can move up and down at the first position and the second position. One end of the positioning element is provided with a first curvature and a second curvature. A sliding element is provided between the housing and the exhaust cam, wherein when the positioning element is in the first position, the sliding element is located in the first curvature, which can just open the exhaust rocker arm above the exhaust cam, and when positioned When the element is in the second position and the sliding element is in the second curvature, you cannot push the exhaust rocker arm above the exhaust cam, so when the cam shaft rotates (please read the precautions on the back before filling this page)- Installation · The size of the line paper is free to use the Chinese National Standard (CNS) A4 (210X297mm). The A7 Β7 is printed by the Beigong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. The rotation of the positioning element in the casing due to the centrifugal force, the positioning element is moved upward from the first position to the second position, so that the sliding element originally located in the first curvature enters the second curvature Inside, instead of supporting the exhaust rocker arm, and when the camshaft stops rotating, the positioning element in the hub body is no longer subjected to the centrifugal force, and returns to the first position, so that the sliding element enters the first curve Within degrees, the exhaust rocker arm is opened again to open the exhaust valve, and the pressure of the combustible gas in the combustion chamber is discharged, so that the locomotive rider can easily start the engine again. In order to enable a more specific understanding of the principles, special features, and operating modes of the present invention, the following examples illustrate the following examples: Brief description of the drawings: The first figure is a cross-sectional view of the internal combustion engine assembly of the present invention. The second figure shows the three-dimensional decomposition of the present invention. The third figure is a schematic side view of the mobile arm of the present invention. The fourth figure shows the combination of the invention. The fifth picture shows a partial section of the fourth picture. Figure 6 is a schematic diagram of the operation of the present invention. The seventh figure is a partial cross-sectional view of the sixth figure. The eighth figure is a schematic diagram of another embodiment of the invention. The ninth exemplary diagram of another embodiment of the present invention. Detailed description: As shown in the accompanying drawings, the present invention is a pseudo "automatic decompression device for an internal combustion engine with at least one power cylinder", which mainly includes an internal combustion engine and an automatic decompression device and other components. -5-This paper standard applies to China National Standard (CNS) Α4 specification (210X297mm) (please read the precautions on the back before filling out this page) Binding · Order 311S67 A7 Printed by the Staff Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs B7 5. Description of the invention () Please refer to the first figure, that is, the specific embodiment of the single-cylinder reciprocating four-stroke internal combustion engine of the present invention used in locomotives. The internal combustion engine is composed of an engine structure having a cylinder 1. A piston 1 1 is provided in the cylinder 1 to reciprocally slide along the inner diameter of the hole of the cylinder 1. The bottom end of the piston 1 1 is provided with a continuous guard 14 A crank shaft 13 is implanted at the bottom end of the connecting rod 14 so that when the piston 11 moves up and down along the inner bore of the cylinder 1, the crank shaft 13 can be driven to perform a rotary motion. The cylinder head 2 is above the piston 11 and a combustion chamber 12 is recessed. One side of the cylinder head 2 is provided with an intake passage 2 1, and the other side is provided with an exhaust passage 22. The intake passages 21 and exhaust The gas channels 22 all penetrate the combustion chamber 12 respectively. In addition, there is a valve for opening / closing the combustion chamber. The valve for opening / closing the combustion chamber includes an intake valve 23 and an exhaust valve 24, in which the valve heads of the intake valve 23 and exhaust valve 24 A part of the pseudo projected into the top of the combustion chamber 12 through the intake passage 21 and the exhaust passage 22 respectively. In addition, the rod parts of the intake valve 23 and the exhaust valve 24 passed through the valve guide 2 3 1. 241 and axial sliding occurs, and the valve bodies 23, 24 are pushed to one side by springs 232, 2 42 respectively. The tail ends of the intake valve 23 and the exhaust valve 24 are respectively connected with an intake rocker arm 25 and an exhaust rocker arm 26, and the rocker arms 25 and 26 are pinned to the cylinder with bolts 251 and 261 respectively In the head 2, the rocker arms 25 and 26 can use the pins 251 and 261 as fulcrums to perform a lever movement. In addition, the other end of the intake rocker arm 25 and the exhaust rocker arm 26 not connected to the valve body are Press against the intake cam 2 7 1 of the camshaft 2 7 and the exhaust cam 272, when the intake cam 271 (exhaust cam 272) (please read the precautions on the back before filling this page).
、tT Μ 本紙張尺度逋用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局貝工消費合作社印製 A7 __B7 五、發明説明（） 突部推頂進氣搖臂25 (排氣搖臂26)時，該進氣搖臂 25 (排氣搖臂26)將以插銷251 (261)為支點 ，進而抵壓進氣閥23 (排氣閥24)向下，使進氣通道 2 1 (排氣通道2 2 )相對燃燒室1 2而打開。 該凸輪軸27傜以適當之傳動裝置（未圖示）與曲柄 軸13耦合，並使凸輪軸2 7之轉速為曲柄軸13之一半 ，以符合四行程引擎之作動要求。 請參照第二圖所示，本發明之自動減壓裝置，其偽包 含有一在凸輪軸2 7所設之軸承2 7 3與排氣凸輪2 7 2 之間環固設有一殼體3,該殼體3在本發明之最佳實施例 中傺呈一環狀，在呈環狀之殼體3中間位置處傜設有貫穿 孔3 1，使殼體3套固設在内燃機之凸輪軸27上，且鄰 近於排氣凸輪272,其中，殼體3在對應於排氣凸輪2 71之一面偽設有一具有開口之容置空間32,而遠離排 氣凸輪272之一面係封閉，凸輪軸27在殼體3與排氣 凸輪2 7 2之間有一凹陷部2 7 4。 一定位元件，該定位元件在本發明之最佳實施例中偽 設有一呈弧狀之移動臂4,該移動臂4偽植設於殼體3所 形成之容置空間32内，且對應於排氣搖臂26之位置處 ，該移動臂4之一端4 1偽藉由一彈簧5樞設在殼體3内 ，使移動臂4能以此端41為支點，而作往復之擺動，而 該彈簧5之回復力量需小於定位元件隨凸輪軸2 7轉動時 所産生之離心力之力量，另，移動臂4偽呈一弧度，使移 動臂4在貼合於殼體3之内壁時，能配合殼體3内壁之弧 - 7 - 本紙張尺度逋用中國國家標準（CNS > A4規格（210X297公釐） (請先閲讀背面之注意事項再填寫本頁) .裝- 經濟部中央樣準局貝工消費合作社印裝 A7 ________B7五、發明説明（） 度，而移動臂4在其自由端上則設有一放大頭部42,使 移動臂4形成一斧頭狀，並在該移動臂4之放大頭部42 上設有一道切面4 2 1以分隔成第一曲度4 3及第二曲度 44,在本發明之最佳實施例中該第一曲度及第二曲度係 分別為一弧面，如第三圖所示。 一滑動元件，該滑動元件在本發明之最佳賁施例中傜 為一圓球滾珠6,該滾珠6偽可横向移動地置設於排氣凸 輪2 7 2與移動臂4之間之凸輪軸2 7上所設之凹陷部2 74内，而滾珠6在置設時須凸出於排氣凸輪之基圓，其 中，當凸輪軸27不轉動時，此時移動臂4未受離心力作 用而停留在第一位置，該滾珠6—周邊偽位於第一曲度4 3内，另一周邊則恰可頂開排氣凸輪2 7 2上方之排氣搖 臂2 6 ,而當凸輪軸2 7轉動時，此時移動臂4受離心力 作用而停留在第二位置，滾珠6之一周邊係位於第二曲度 4 4内，且第二曲度4 4與排氣凸輪2 7 2之間距離，恰 使滾珠6之另一周邊無法頂開排氣搖臂2 6。 請參照第三圖所示，本發明中，該移動臂4之第一曲 度43之弧孔長度係大於圓球滾珠6之半徑，使圓球滾珠 6在位於第一曲度43内時，由於，該圓球滾珠6—半以 上皆位於第一曲度4 3内，而無法頂開移動臂4。 本發明中，在移動臂4對應於殼體3内壁之一面之端 緣上設有凸起之凸緣45,俥使移動臂4在凸輪軸27轉 動時，且因離心力之關偽而往上移動時，只有該凸緣4 5 會貼合在殼體3之内壁上，而減少摩擦力，俾增加移動臂 本紙張尺度逋用中國國家揉準（CNS ) A4規格（2K)X297公釐） (請先聞讀背面之注意事項再填寫本頁) -裝· •ΤΓ -線 A7 B7 67 五、發明説明（） 4移動時之順暢。 請參照第四、五圖所示，偽本發明組裝於凸輪軸27 上之示意圖，其中，該滾珠6其一周邊傜位於移動臂4之 第一曲度43内，而另一周邊刖頂開排氣搖臂26,當凸 輪軸27在正常旋轉方向旋轉時，該殼體3亦會跟箸轉動 ，而殼體3内之移動臂4則會因殼體3之轉動而産生一離 心力，使得移動臂4藉由其套設有彈簧5之一端作為支點 ，而令移動臂4之自由端往上擺動，而當移動臂4往上擺 動時，原位於第一曲度43之滾珠6,因移動臂4由第一 位置移動至第二位置，而使滾珠6位於第二曲度44内， 如第六、七圖所示，由於第二曲度44與排氣凸輪272 之間距離，恰能使滾珠6之另一周邊無法頂開排氣搖臂2 6,使排氣搖臂26—端所連接之排氣閥24往上，使排 氣通道22相對之燃燒室1 2關閉，反之；當内燃機熄火 ,進而使曲柄軸1 3由其正常旋轉方向（順時針方向）之 反方向（逆時針方向）回轉一小角度時，凸輪軸27亦將 沿正常旋轉方向之反方向旋轉，由於，凸輪軸27上之殼 體3内之移動臂4會因為不再受離心力之影響，而藉由所 套設之彈簧5回復原位，此時，原位於第二曲度44内之 滾珠6,因移動臂4由第二位置移動至第一位置，而使滾 珠6又位於第一曲度43内，同時，頂推排氣凸輪272 上方之排氣搖臂26,使排氣搖臂26以插銷261為支 點，進而抵壓排氣閥24向下，使排氣通道22相對之燃 燒室1 2打開，使燃燒室1 2内之可燃氣體之壓力從排氣 - 9 - 本紙張尺度適用中國國家梂準（CNS ) A4規格（210X297公釐） ----；I---1——^—— (請先閱讀背面之注意事項再填寫本頁) 訂 錄 經濟部中央標準局員工消费合作社印裝 經濟部中央標準局員工消費合作社印裝 A7 B7_ 五、發明説明（) 通道22排出，令機車騎士不須用力踩踏腳踏槓桿，而可 輕易地再發動引擎。 請參照第八圖所示，偽本發明之另一實施例，其中， 該殼體3’傜設有一套環3 1，，該套環3 1’傺套於凸 輪軸27上，並於套環3 1’之部分圓周上設有一面開口 之收容室32’ ，於該收容室32’上置設有一可上下移 動地之定位元件，而該定位元件偽設有一塊體4’ ，該塊 體4’之一面傺設有一道切面41’ ，以分隔成第一曲度 43’及第二曲度44’ ，另，設有一滑動元件，該滑動 元件傜為一截頭錐塊6’ ，藉由該錐塊6，之斜面6 1， ，當凸輪軸27不轉動時，該錐塊6’對應於移動塊4’ 之一端像位於第一曲度43’内，此時塊體4’未受離心 力作用，而停留在第一位置，另端側邊之斜面6 1 ’則恰 可頂開排氣凸輪2 7 2上方之排氣搖臂2 6，而當凸輪軸 2 7轉動時，此時塊體4’受離心力作用，而停留在第二 位置，該錐塊6 ’對應於移動塊4 ’之一端傜位於第二曲 度4 4 ’内，而使錐塊6 ’另端側邊之斜面6 1 ’無法頂 開排氣搖臂2 6。 請參照第九圖所示，其中，藉由彈簧5樞設於殼體3 之容置空間3 2内之移動臂4中，其彈簧亦可為板簧（簧 線）5’ ，該板簧5’之一端5 1’偽固定於移動臂4之 一端4 1,而板簧5’之另端52，則搭設於殼體3之容 置空間3 2内，使移動臂4作往愎之擺動。 惟以上所述，僅為本發明之諸可行實施例而已，並非 -10 - (請先閲讀背面之注意事項再填寫本頁) •裝· 訂 線 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 五、發明説明（ A7 B7 圍施 範實 利效 專等 請之 申化 列變 下他 據其 依之 〇 凡為内 舉而圍 ，神範 圍精利 範其專 利及之 專以明 之徵發 明特本 發、於 本容含 定内包 限之應 以述皆 用所 ， (請先聞讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210Χ297公釐）、 TT Μ This paper scale adopts the Chinese National Standard (CNS) A4 specification (210X297mm) Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Beigong Consumer Cooperative A7 __B7 V. Description of invention () The push-up air intake rocker 25 ( When the exhaust rocker arm 26), the intake rocker arm 25 (exhaust rocker arm 26) will use the latch 251 (261) as a fulcrum, and then press the intake valve 23 (exhaust valve 24) downward, so that the intake air The passage 2 1 (exhaust passage 2 2) opens relative to the combustion chamber 12. The camshaft 27 is coupled to the crankshaft 13 with an appropriate transmission device (not shown), and the rotation speed of the camshaft 27 is one-half of the crankshaft 13 to meet the actuation requirements of the four-stroke engine. Please refer to the second figure, the automatic decompression device of the present invention includes a housing 3 fixed between the bearing 2 7 3 provided on the camshaft 2 7 and the exhaust cam 2 7 2. In the preferred embodiment of the present invention, the housing 3 has a ring shape. A through hole 31 is provided at the middle position of the ring-shaped housing 3, so that the housing 3 is fixed on the camshaft 27 of the internal combustion engine. And adjacent to the exhaust cam 272, wherein the housing 3 is pseudo-equipped with an accommodating space 32 having an opening on a surface corresponding to the exhaust cam 271, and the surface away from the exhaust cam 272 is closed, the cam shaft 27 There is a recess 274 between the housing 3 and the exhaust cam 272. A positioning element, which in the preferred embodiment of the present invention is pseudo-arranged with an arc-shaped moving arm 4 that is pseudo-planted in the accommodating space 32 formed by the housing 3 and corresponds to At the position of the exhaust rocker 26, one end 41 of the moving arm 4 is pivotally arranged in the housing 3 by a spring 5, so that the moving arm 4 can swing back and forth with this end 41 as a fulcrum, and The restoring force of the spring 5 needs to be less than the force of the centrifugal force generated when the positioning element rotates with the camshaft 27. In addition, the moving arm 4 is pseudo-radian, so that when the moving arm 4 is attached to the inner wall of the housing 3, Matching the arc of the inner wall of the housing 3-7-This paper uses the Chinese national standard (CNS & A4 specifications (210X297mm) (please read the precautions on the back before filling in this page). Printed by the Bureau Cooperative Consumer Cooperative A7 ________B7 Fifth, the invention description () degree, and the mobile arm 4 is provided with an enlarged head 42 on its free end, so that the mobile arm 4 forms an axe shape, and on the mobile arm 4 The enlarged head 42 is provided with a cut surface 4 2 1 to be divided into a first curvature 4 3 and a second curvature 44, In the preferred embodiment of the present invention, the first curvature and the second curvature are respectively a curved surface, as shown in the third figure. A sliding element, the sliding element is in the best embodiment of the present invention It is a spherical ball 6 which is placed in a recessed portion 2 74 provided on the camshaft 2 7 between the exhaust cam 2 7 2 and the moving arm 4 in a pseudo-movable manner, and the ball 6 is placed Time must protrude from the base circle of the exhaust cam, where, when the camshaft 27 does not rotate, the moving arm 4 stays in the first position without centrifugal force at this time, the ball 6-the periphery is located at the first curvature 4 3, the other periphery can just open the exhaust rocker arm 2 6 above the exhaust cam 2 7 2, and when the cam shaft 2 7 rotates, the moving arm 4 stays at the second position under the centrifugal force at this time, One periphery of the ball 6 is located in the second curvature 44, and the distance between the second curvature 4 4 and the exhaust cam 2 7 2 is such that the other periphery of the ball 6 cannot open the exhaust rocker arm 2 6 Please refer to the third figure, in the present invention, the length of the arc hole of the first curvature 43 of the moving arm 4 is greater than the radius of the ball ball 6, so that the ball ball 6 When it is located in the first curvature 43, since the ball balls are more than half-half located in the first curvature 43, the movable arm 4 cannot be pushed open. In the present invention, the movable arm 4 corresponds to the housing 3 A raised flange 45 is provided on the end edge of one surface of the inner wall, so that when the moving arm 4 moves upward due to the centrifugal force when the camshaft 27 rotates, only the flange 4 5 will fit in On the inner wall of the housing 3, to reduce the friction force, in order to increase the moving arm, the paper size is in accordance with the Chinese National Standard (CNS) A4 specification (2K) X297mm) (please read the precautions on the back before filling this page )-Installed · • ΤΓ-line A7 B7 67 5. Description of the invention () 4 Smooth movement. Please refer to the fourth and fifth figures, the schematic diagram of the pseudo-present invention assembled on the camshaft 27, wherein, one peripheral edge of the ball 6 is located in the first curvature 43 of the moving arm 4, and the other peripheral edge is open Exhaust rocker arm 26, when the camshaft 27 rotates in the normal direction of rotation, the housing 3 will also rotate with the chopper, and the moving arm 4 in the housing 3 will generate a centrifugal force due to the rotation of the housing 3, making The moving arm 4 is provided with one end of the spring 5 as a fulcrum, so that the free end of the moving arm 4 swings upward, and when the moving arm 4 swings upward, the ball 6 originally located at the first curvature 43, because The moving arm 4 moves from the first position to the second position, and the ball 6 is located in the second curvature 44, as shown in the sixth and seventh figures, due to the distance between the second curvature 44 and the exhaust cam 272, just It can make the other periphery of the ball 6 unable to open the exhaust rocker arm 26, so that the exhaust valve 24 connected to the end of the exhaust rocker arm 26 is upward, so that the exhaust passage 22 is closed relative to the combustion chamber 12 and vice versa ; When the internal combustion engine is turned off, the crankshaft 13 is returned from the reverse direction (counterclockwise) of its normal direction of rotation (clockwise) At a small angle, the camshaft 27 will also rotate in the opposite direction of the normal direction of rotation. Since the moving arm 4 in the housing 3 on the camshaft 27 will no longer be affected by the centrifugal force, the The spring 5 returns to its original position. At this time, the ball 6 originally located in the second curvature 44 is moved to the first position by the moving arm 4 from the second position, and the ball 6 is located in the first curvature 43 at the same time. Push the exhaust rocker arm 26 above the exhaust cam 272 so that the exhaust rocker arm 26 uses the latch 261 as a fulcrum, and then press the exhaust valve 24 downward, so that the exhaust passage 22 opens relative to the combustion chamber 12 to make The pressure of the combustible gas in the combustion chamber 12 is from the exhaust-9-This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210X297 mm) ----; I --- 1 ---- ^ ---- ( Please read the precautions on the back before filling out this page) Catalogue Printed by the Ministry of Economy Central Standards Bureau Employee Consumer Cooperative Printed by the Ministry of Economics Central Standards Bureau Employee Consumer Cooperative A7 B7_ V. Invention description () Channel 22 is discharged, so that the locomotive rider does not The pedal lever must be pressed hard, and the engine can be started again easily. Referring to the eighth figure, another embodiment of the present invention is pseudo, in which the casing 3'Yo is provided with a set of rings 31, which is sleeved on the camshaft 27 and A part of the circumference of the ring 3 1 'is provided with an open side receiving chamber 32', and a positioning element capable of moving up and down is provided on the receiving chamber 32 ', and the positioning element is falsely provided with a block 4' One face of the body 4 'is provided with a cut surface 41' to be divided into a first curvature 43 'and a second curvature 44', and a sliding element is provided, which is a frusto-conical block 6 ', With the inclined surface 61 of the cone block 6, when the camshaft 27 does not rotate, one end of the cone block 6 'corresponding to the moving block 4' is located in the first curvature 43 ', and the block body 4' Without being affected by centrifugal force, it stays in the first position, and the inclined surface 6 1 ′ on the other side can just open the exhaust rocker arm 26 above the exhaust cam 2 7 2, and when the cam shaft 2 7 rotates, At this time, the block 4 'is subjected to centrifugal force and stays in the second position. The cone block 6' corresponds to one end of the moving block 4 'located in the second curvature 4 4' , So that the inclined surface 6 1 ′ of the other side of the cone block 6 ′ cannot push the exhaust rocker arm 26. Please refer to the ninth figure, in which the spring 5 is pivotally arranged in the moving arm 4 in the accommodating space 32 of the housing 3, the spring may also be a leaf spring (spring wire) 5 ', the leaf spring One end 5 1 'of the 5' is pseudo-fixed to one end 41 of the moving arm 4, and the other end 52 of the leaf spring 5 'is erected in the accommodating space 3 2 of the housing 3, so that the moving arm 4 moves forward swing. However, the above is only possible embodiments of the present invention, not -10-(please read the precautions on the back before filling in this page) • The paper size of the binding and binding book is applicable to the Chinese National Standard (CNS) A4 specification (210X297mm) V. Description of invention (A7 B7 Applicant's application for the application of statutory and practical benefits is based on the changes he based on, and he is encircled for internal promotion. The special edition issued and the content within the content limit shall be used for description. (Please read the precautions on the back before filling out this page) The paper printed by the Ministry of Economic Affairs Central Standards Bureau Employee Consumer Cooperative Standards are applicable to China National Standard (CNS) A4 specification (210Χ297mm)