4182 8 1 五、發明說明（1) 本發明係一種二行程引擎，藉由特殊構造之汽缸與活 塞以最少'的零件達成單流驅氣（uniflow scavenging) 的效果。 今曰引擎大部分都是四行程引擎，因其效率高污染小 之優點’但其機械結構之複雜也是眾所週知，且動力較 低，而二行程引擎雖有結構簡單、重量輕、馬力大之優 點’但是由於其採用的回流驅氣（unifl〇w scavenging ) 會造成廢氣與油氣混和，並且部分油氣自排氣口溢出，因 此二行程引擎的效率低、污染高，雖然可採用單流驅氣加 以改進，但目前採用單流驅氣的引擎構造複雜不在四行程 引擎之下，製造成本高。 本發明之目的在提供一種特殊構造之二行程引擎，僅 以改變活塞與汽缸之構造，便可達成單流驅氣的效果，保 有二行程引擎構造簡單、高馬力之優點，改善其污染高、 效率低之缺點。 茲配合圖示將將本發明較佳實施例詳細說明如下。 參閱第一、一為本發明實施例之活塞立體圖與剖面 圖’活塞頂知有管狀凸出物’其末端管面上有柵狀排氣 孔。 參閱第二圖為本發明實施例之動力行程，汽缸1内氣 體因燃燒而膨脹使活塞2向下運動。 參閲第四圖為本發明實施例之排氣行程，廢氣因排氣 孔3打開而排出。 參閱第五圖為本發明實施例之驅氣行程，由壓縮空氣4182 8 1 V. Description of the invention (1) The present invention is a two-stroke engine, which achieves the effect of uniflow scavenging with a minimum number of parts through a specially constructed cylinder and piston. Today, most of the engines are four-stroke engines, because of their high efficiency and low pollution. But the complexity of its mechanical structure is also well known, and its power is low, while the two-stroke engines have the advantages of simple structure, light weight, and high horsepower. 'However, because of its uniflow scavenging, the exhaust gas will be mixed with the oil and gas, and some oil and gas will overflow from the exhaust port. Therefore, the two-stroke engine has low efficiency and high pollution. Improved, but the current structure of the single-flow purge engine is not complex under the four-stroke engine, and the manufacturing cost is high. The purpose of the present invention is to provide a two-stroke engine with a special structure. By only changing the structure of the piston and the cylinder, the effect of single-flow driving can be achieved. The two-stroke engine has the advantages of simple structure and high horsepower, and improves its high pollution. The disadvantage of low efficiency. The preferred embodiments of the present invention will be described in detail below with reference to the drawings. Refer to the first and first perspective and sectional views of the piston according to the embodiment of the present invention. 'Piston crown is known to have tubular protrusions', and its end pipe surface has grid-like exhaust holes. Refer to the second figure for the power stroke of the embodiment of the present invention. The gas in the cylinder 1 expands due to combustion and moves the piston 2 downward. Refer to the fourth figure for the exhaust stroke of the embodiment of the present invention. The exhaust gas is exhausted because the exhaust hole 3 is opened. Refer to the fifth figure for the expelling stroke of the embodiment of the present invention.
第4頁 4182 81 五 發明說明（2) =口5注入之高壓空氣，因驅氣口4之打開而湧入 並且因排氣口 3尚未關閉，亦將廢氣擠出汽缸丨。 ， 參閱第六圖為本發明實施例之壓縮行程，活塞 運動並將驅氣口 4、排氣口 3先後關閉气二 被壓縮。 几缸1内氣體因而 ’V、„以上所述，本案所發明之單流引擎已具 ,、新穎性與進步性，符合發明專利要件。惟β i ^ 者，僅兔士放^ IT 氓Μ上所速 實施銘阑 之較佳實施例而已，並非用來限定本發明 ’即凡依本發明申請專利範圍所作的均等變化與 ^飾’皆為本發明專利範圍所涵蓋。 圖式之簡單說明： 第 一 、 —圖為本發明第一實施例具特殊構造之活塞立體 圖 〇 — π 一圖為本發明第一實施例具特殊構造之活塞立體 剖面圖。 ^二圖為本發明第一實施例之動力行程。 四圖為本發明第一實施例之排氣行程。 f圖為本發明第一實施例之驅氣行程。 ^圖為本發明第一實施例之壓縮行程。 活塞 驅氣孔 圖示中之參照號數 汽缸 排氣孔Page 4 4182 81 V Description of the invention (2) = High-pressure air injected from port 5 flows in due to the opening of drive port 4 and because exhaust port 3 is not closed, exhaust gas is also squeezed out of the cylinder. Referring to the sixth figure, the compression stroke of the embodiment of the present invention, the piston moves, and the exhaust port 4 and the exhaust port 3 are closed and the air 2 is compressed. The gas in several cylinders 1 is therefore 'V,' As mentioned above, the single-flow engine invented in this case is already novel, innovative, and progressive, and meets the requirements of the invention patent. However, only β i ^, only rabbits release ^ IT The above-mentioned implementation of the preferred embodiment of the Minglang is not intended to limit the present invention, that is, "all equal changes and modifications made in accordance with the scope of the patent application of the present invention" are covered by the scope of the invention patent. : First,-The figure is a perspective view of a piston with a special structure in the first embodiment of the present invention. 0-π The picture is a perspective view of the piston with a special structure in the first embodiment of the present invention. ^ The second figure is the first embodiment of the present invention. The four strokes are the exhaust stroke of the first embodiment of the present invention. The f stroke is the expelling stroke of the first embodiment of the present invention. The ^ is the compression stroke of the first embodiment of the present invention. Reference number of cylinder exhaust holes
4182 8 i 五、發明說明（3) 5 壓縮空氣入口 14182 8 i V. Description of the invention (3) 5 Compressed air inlet 1