201107588 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種引擎之汽缸頭，特別是指一種裝 設於二輪以上之車輛上的引擎之汽缸頭。 【先前技術】 參閱圖卜為目前一般速克達機車所安裝的引擎卜該 引擎1包含—個曲軸箱u、—個連設於該曲轴箱u上的汽 缸體個覆蓋於該汽虹體12的汽缸頭13，及一個蓋 設於該汽缸頭13上的汽虹頭蓋14，而該汽缸體η與汽虹 頭13是以非直立的方式向下傾斜設置。 其中’該汽缸頭13具有-個進氣單元131、一個排氣 單元132，及一個位於該進氣單元⑶與排氣單元132之間 的凸輪軸133’#該引擎1運作時，機油會從該凸輪軸U3 的機油孔流出’並流經該汽虹頭13、汽缸體12，再流至該 曲轴箱⑴而機油的作用是可以潤滑引擎ι中的元件，同 時將引擎"斤產生的熱能帶走而達到冷卻的作用。由於該 引擎1為傾斜設置，而該汽缸涵丨q认— 飞缸碩13的底側鄰近於該排氣單 疋132處形成有一個凹陷冑134,因此當機油由該機油孔流 出並流經該凹陷部134_’容易蓄積於該凹陷部BA中無 法繼續流動進行循環過濾。 由於機油是於該機車的各元件之間循環流動，因此機 油内會摻雜有灰塵、微小鐵屬等雜質，當該機車震動時， 會使得蓄積於該凹陷部134中的機油噴機鄰近的元件，例 如該進氣單元131或排氣單幻讓機油内的雜質殘留於 201107588 所述元件上， 雜質而有磨損 【發明内容】 本發明之目的，即為摆扭嫌， 缸頭卩在&供-種可以有效降低汽 缸頭内之積油情形的引擎之汽缸頭。 於疋，本發明引擎之汽缸頭，該引擎包含-個曲轴箱 从、… 曲軸相上的，飞缸體、-個覆蓋於該汽缸體 、、八頭、-個蓋設於該汽缸頭上的汽紅頭蓋，及一個連 通於該曲軸知、汽缸體，及汽缸頭的機油回流道，該汽缸 體與4頭是以非直立的方賴斜設置，並依其設置方向 定義出一軸線，其中，該汽缸頭包含： 一個汽缸頭本體，具有一個圍繞壁； 至:>、個進氣閥單元，設置於該汽缸頭本體上；及 至V個排氣閥單元，設置於該汽缸頭本體上並間隔 於該進氣閥單元； 其特徵在於，該圍繞壁朝向下方的一側向内凸設有一 凸出部，而該圍繞壁對應於該凸出部的外側面則形成一内 凹部’其中，該凸出部是凸設於該機油回流道旁。 本發明之功效在於’藉由該凸出部的設置，當機油流 經該汽缸頭時’會使得機油經由該凸出部快速地流入該機 油回流道而進行循環過濾，有效避免機油蓄積於該汽缸頭 的情形，進而避免機油内的雜質殘留而導致長期運轉下機 件的磨損或是有異音的產生。 【實施方式】 201107588 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之兩個較佳實施例的詳細說明中將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 參閲圖2及圖3，本發明引擎之汽缸頭5之第一較佳實 施例，該引擎2包含一個曲軸箱3、__個連設於該曲軸箱3 上的汽缸體4、一個覆蓋於該汽缸體4的汽缸頭5、一個蓋 設於該汽缸頭5上的汽缸頭蓋6、一個連通於該曲軸箱 汽缸體4’及汽紅頭5的機油回流道7(因視角的關係只顯示 於圖3) ’及一個導引冷卻風通過引擎2外周面的導風罩蓋8 ，而忒 >飞缸體4與汽缸頭5是以非直立的方式傾斜設置， 並依其設置方向定義出一軸線1〇〇。 其中，定義一條垂直線101，並.界定該軸線1〇()與該垂 直線101之間的夾角θ是大於等於4〇度且小於9〇度。 另外，要特別說明的是，本實施例是以氣冷式引擎2 為例來4明’因此是該引擎2是包含導風罩蓋8，當然該引 擎2也可以是水冷式引擎2,而不具備導風罩蓋8的結構， 因此不應以本實施例所揭露的内容為限。 參閱圖4，該汽缸頭5包含一個汽缸頭本體51、兩個 叹置於忒汽缸頭本體51上的進氣閥單元52,及一個設置於 忒/飞缸頭本體5 1上的排氣閥單元53，該汽缸頭本體5丨具 有個圍繞壁5 11，該圍繞壁511朝向下方的一側向内凸設 有凸出部5 12，而該圍繞壁5 11對應於該凸出部5 12的外 201107588 側面則形成一内凹部5 13 (因視角的關係只見於圖2)。 參閱圖3及圖4 ’ s亥凸出部512是凸設於該機油回流道 7旁，而該凸出部512是高於該機油回流道7的底壁，且如 圖4所示，該凸出部512是朝向該機油回流道7的底壁方 向傾斜設置。 參閱圖4，於本實施例中，該排氣閥單元53是鄰近該 圍繞壁5 11朝向下方的一側，因此該凸出部512是鄰近該汽 缸頭5的排氣側，當然也可以視實際製造情形，使所述進 氣閥單元52是鄰近該圍繞壁5 11朝向下方的一側，因此不 應以本實施例所揭露的内容為限。 復參閱圖2 ’該汽缸頭5更包含一個固設於該圍繞壁 511之内凹部513上的輔助單元54,於本實施例中，該輔助 單元54是與該軸線100同方向設置，且該輔助單元54包 括多數個散熱鰭片541 (因為視角的關係，於圖2中只顯示 一個），用以加強該引擎2的散熱效能，當然，該輔助單元 54也可以是包括多數個補強肋，用以加強該汽缸頭5的強 度’因此不應以本實施例所揭露的内容為限。 另外，於本實施例中，該導風罩蓋8是罩覆於該汽缸 頭5部分的圍繞壁511(見圖4)外周面及該汽缸體4上，而 該導風罩蓋8的罩覆位置為熟知該項技藝者所能輕易置換 ’因此不應以本實施例所揭露的内容為限。 一併參閱圖2及圖4，該凸出部512具有一個上傾斜段 514，及一個連接於該上傾斜段5 14的下傾斜段5丨5，於本 實施例中，該下傾斜段515的傾斜度是大於該上傾斜段514 201107588 。當該引擎2運作時，機油會該汽缸頭5内的機油孔55流 出’並因為該汽缸頭5傾斜設置的關係，而使機油往該汽 缸頭5的排氣側流動，當機油流經該凸出部5丨2時，由於 該上、下傾斜段514、515的設計，搭配該凸出部512是朝 向該機油回流道7的底壁方向傾斜設置，因此機油可以快 速地通過該凸出部512而進入該機油回流道7，以進行循環 過渡。 φ 藉由上述設計’本發明引擎之汽缸頭5於實際使用時 具有以下所述的優點： (1) 有效減少積油的情形： 藉由該凸出部512的設計，當機油經由該凸出部 512時，會快速地流過該凸出部512的上下傾斜段 514、515而進入該機油回流道7，且該凸出部512是朝 向該機油回流道7的底壁方向傾斜設置，機油也會由該 上傾斜段514直接流入該機油回流道7中，且該上、下 • 傾斜段514、並無任何凹陷處，因此可以有效減少 機油蓄積於該汽缸頭5内的情形。 (2) 有效避免機件的磨損與異音的產生·· 承上所述，由於該凸出部512料計，能有效減少 積油的If形因此此有效避免蓄積的機油喷滅至鄰近的 機件上，進而避免機油内的雜暂 幻雜貝讓機件磨才貝與運轉時異 音的產生。 / (3) 加強該輔助單元54的效果： 由於該輔助單元54是設團姑战广 '叹直於该圍繞壁511之内凹 201107588 部513上，因此可以加大該輔助單元54之散熱鰭片 541或是補強肋的體積，而不會影響該導風罩蓋8的設 置’或是導致該引擎2的體積有巨大化的情形藉此可 以有效加強該輔助單元54的效果。 參閱圖5’本發明引擎之汽缸頭5之第二較佳實施例， 大致類似前述該第一較佳實施例，不同之處在於：該輔助 單元54是與該軸線100不同方向設置，由圖5中所示，該 輔助單元54的設置方向是與該軸線1〇〇概呈垂直。於本^ 施例中，該輔助單元54包括多數個散熱鰭片541來加強該 引擎2的散熱效能，當然也可以是包括多數個補強肋，用 以加強該汽缸頭5的強度。 综上所述，本發明引擎之汽缸頭5’藉由該凸出部512 的設置，當機油流經該汽缸頭5時，會使得機油經由該凸 出部512快速地流入該機油回流道7而進行循環過濾，有 效避免機油蓄積於該汽缸頭5的情形，進而避免機油内的 雜質殘留而導致長期運轉下機件的磨損或是有異音的產生 ’故確實能達成本發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 忐以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一側視剖視圖’說明習知引擎之汽缸頭内的凹 陷部的態樣； 201107588 圖2是一側視剖視圖，說明本發明引擎之汽缸頭 一較佳實施例； 、 圖3是-側視剖視圖’是與圖2不同剖面位 圖，輔助3兑明δ亥第一較佳實施例； 圖4是-前視圖，輔助說明該第一較佳實施例中，… :頭:之凸出部的態樣，於此圖中是省略了汽缸頭蓋； 圖5是1視剖視圖，說明本發明料 二較佳實施例。 印叼弟 201107588 【主要元件符號說明】 100 軸線 514 上傾斜段 101 垂直線 515 下傾斜段 2 引擎 52 進氣閥單元 3 曲軸箱 53 排氣閥單元 4 汽缸體 54 輔助單元 5 汽缸頭 541 散熱鰭片 51 汽缸頭本體 55 機油孔 511 圍繞壁 6 汽缸頭蓋 512 凸出部 7 機油回流道 513 内凹部 8 導風罩蓋 10201107588 VI. Description of the Invention: [Technical Field] The present invention relates to a cylinder head of an engine, and more particularly to a cylinder head of an engine mounted on a vehicle of two or more wheels. [Prior Art] Refer to Figure Bu for the engine installed in the current general Kekeda locomotive. The engine 1 includes a crankcase u, and a cylinder block connected to the crankcase u covers the steam rainbow body 12 The cylinder head 13 and a steam head cover 14 which is disposed on the cylinder head 13 and the cylinder block n and the steam head 13 are inclined downward in a non-upright manner. Wherein the cylinder head 13 has an intake unit 131, an exhaust unit 132, and a cam shaft 133' between the intake unit (3) and the exhaust unit 132. When the engine 1 is in operation, the oil will be from The oil hole of the cam shaft U3 flows out 'and flows through the steam head 13 and the cylinder block 12, and then flows to the crankcase (1). The function of the oil is to lubricate the components in the engine ι, and at the same time, the engine is generated. The heat is taken away to achieve the cooling effect. Since the engine 1 is in an inclined setting, and the bottom side of the cylinder block 13 is formed adjacent to the exhaust unit 132, a recess 胄 134 is formed, so that oil flows out through the oil hole and flows through The depressed portion 134_' is easily accumulated in the depressed portion BA and cannot continue to flow for cyclic filtration. Since the oil is circulated between the components of the locomotive, the oil is doped with impurities such as dust and tiny iron, and when the locomotive vibrates, the oil sprayer accumulated in the recess 134 is adjacent. The component, for example, the air intake unit 131 or the exhaust gas singularly causes the impurities in the oil to remain on the component described in 201107588, and the impurities are worn out. [Invention] The object of the present invention is that the cylinder head is in the & The cylinder head of the engine that can effectively reduce the accumulation of oil in the cylinder head. Yu Yu, the cylinder head of the engine of the present invention, the engine includes a crankcase from, ... on the crankshaft phase, a flying cylinder body, a cover of the cylinder block, eight heads, a steam cover on the cylinder head a red head cover, and an oil return passage connected to the crankshaft, the cylinder block, and the cylinder head, wherein the cylinder block and the four heads are disposed in a non-upright manner, and an axis is defined according to the direction of the setting, wherein The cylinder head comprises: a cylinder head body having a surrounding wall; to: >, an intake valve unit disposed on the cylinder head body; and to V exhaust valve units disposed on the cylinder head body and Intersected in the intake valve unit; wherein a convex portion is protruded inwardly from a side of the surrounding wall toward the lower side, and an inner concave portion is formed in the surrounding wall corresponding to the outer side surface of the protruding portion The protruding portion is convexly disposed beside the oil return passage. The effect of the invention is that 'by the arrangement of the protruding portion, when the oil flows through the cylinder head, the oil can be circulated and filtered through the protruding portion to flow into the oil return passage, thereby effectively preventing the oil from accumulating in the oil. In the case of the cylinder head, in order to avoid the residual of impurities in the oil, the wear of the machine parts under long-term operation or the occurrence of abnormal sounds may occur. The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. Referring to Figures 2 and 3, a first preferred embodiment of the cylinder head 5 of the engine of the present invention, the engine 2 includes a crankcase 3, __ a cylinder block 4 connected to the crankcase 3, and a cover The cylinder head 5 of the cylinder block 4, a cylinder head cover 6 disposed on the cylinder head 5, and an oil return passage 7 connected to the crankcase cylinder block 4' and the steam red head 5 (only shown due to the angle of view) In Fig. 3) 'and a guide hood 8 for guiding the cooling air through the outer peripheral surface of the engine 2, and 飞> the flying cylinder 4 and the cylinder head 5 are inclined in a non-upright manner, and are defined according to the setting direction thereof. One axis is 1 〇〇. Wherein, a vertical line 101 is defined, and the angle θ between the axis 1 〇 () and the vertical line 101 is defined to be greater than or equal to 4 degrees and less than 9 degrees. In addition, it should be particularly noted that the present embodiment is an air-cooled engine 2 as an example. Therefore, the engine 2 includes a windshield cover 8, and the engine 2 may also be a water-cooled engine 2, and The structure of the air guiding cover 8 is not provided, and therefore should not be limited to the contents disclosed in the embodiment. Referring to FIG. 4, the cylinder head 5 includes a cylinder head body 51, two intake valve units 52 which are placed on the cylinder head body 51, and an exhaust valve disposed on the crucible/flying head body 51. The unit head 53 has a surrounding wall 511, and a convex portion 512 is convexly protruded from a side of the surrounding wall 511 facing downward. The surrounding wall 511 corresponds to the protruding portion 512. The outer surface of the 201107588 side forms an inner recess 5 13 (only due to the viewing angle shown in Figure 2). Referring to FIGS. 3 and 4, the swell 512 is protruded from the oil return passage 7, and the projection 512 is higher than the bottom wall of the oil return passage 7, and as shown in FIG. The projection 512 is inclined toward the bottom wall direction of the oil return passage 7. Referring to FIG. 4, in the embodiment, the exhaust valve unit 53 is adjacent to the side of the surrounding wall 511, so that the protruding portion 512 is adjacent to the exhaust side of the cylinder head 5, of course, In the actual manufacturing situation, the intake valve unit 52 is adjacent to the side of the surrounding wall 511 facing downward, and therefore should not be limited to the contents disclosed in the embodiment. Referring to FIG. 2, the cylinder head 5 further includes an auxiliary unit 54 fixed to the inner concave portion 513 of the surrounding wall 511. In the embodiment, the auxiliary unit 54 is disposed in the same direction as the axis 100, and the The auxiliary unit 54 includes a plurality of heat dissipating fins 541 (only one is shown in FIG. 2 because of the viewing angle) to enhance the heat dissipation performance of the engine 2. Of course, the auxiliary unit 54 may also include a plurality of reinforcing ribs. The strength of the cylinder head 5 is to be reinforced. Therefore, it should not be limited to the contents disclosed in the embodiment. In addition, in the embodiment, the air guiding cover 8 is a cover covering the outer peripheral surface of the wall 511 (see FIG. 4) and the cylinder block 4 of the cylinder head 5, and the cover of the air guiding cover 8 The position of the cover is easily replaced by those skilled in the art' and therefore should not be limited to the contents disclosed in this embodiment. Referring to Figures 2 and 4, the projection 512 has an upper inclined section 514 and a lower inclined section 5丨5 connected to the upper inclined section 514. In the present embodiment, the lower inclined section 515 The inclination is greater than the upper inclined section 514 201107588. When the engine 2 is in operation, the oil will flow out of the oil hole 55 in the cylinder head 5 and because the cylinder head 5 is inclined, the oil flows to the exhaust side of the cylinder head 5 when the oil flows through the When the projections 5丨2 are disposed, the projections 512 are inclined toward the bottom wall of the oil return passage 7 due to the design of the upper and lower inclined sections 514 and 515, so that the oil can quickly pass through the projections. The portion 512 enters the oil return passage 7 for a cyclic transition. φ By the above design, the cylinder head 5 of the engine of the present invention has the following advantages in practical use: (1) Effectively reducing the situation of oil accumulation: By the design of the projection 512, when the oil passes through the projection At the time of the portion 512, the upper and lower inclined portions 514, 515 of the protruding portion 512 are quickly flowed into the oil return passage 7, and the protruding portion 512 is inclined toward the bottom wall of the oil return passage 7, the oil The upper inclined section 514 also flows directly into the oil return passage 7, and the upper and lower inclined sections 514 are free from any depressions, so that the accumulation of oil in the cylinder head 5 can be effectively reduced. (2) Effectively avoid the wear of the machine parts and the generation of abnormal sounds. · As mentioned above, since the projections 512 can effectively reduce the If shape of the oil accumulation, it is effective to prevent the accumulated oil from being sprayed to the adjacent ones. On the machine parts, and then to avoid the miscellaneous miscellaneous miscellaneous shellfish in the oil to make the machine grinding the shell and the generation of abnormal sound during operation. / (3) Enhancing the effect of the auxiliary unit 54: Since the auxiliary unit 54 is disposed on the concave portion 201107588 portion 513 of the surrounding wall 511, the heat dissipation fin of the auxiliary unit 54 can be enlarged. The effect of the auxiliary unit 54 can be effectively enhanced by the fact that the piece 541 is the volume of the reinforcing rib without affecting the arrangement of the air guiding cover 8 or causing the volume of the engine 2 to be enlarged. Referring to Figure 5, a second preferred embodiment of the cylinder head 5 of the engine of the present invention is substantially similar to the first preferred embodiment described above, except that the auxiliary unit 54 is disposed in a different direction from the axis 100. As shown in FIG. 5, the setting direction of the auxiliary unit 54 is substantially perpendicular to the axis 1〇〇. In the embodiment, the auxiliary unit 54 includes a plurality of heat dissipation fins 541 to enhance the heat dissipation performance of the engine 2. Of course, a plurality of reinforcing ribs may be included to strengthen the strength of the cylinder head 5. In summary, the cylinder head 5' of the engine of the present invention, through the arrangement of the projection 512, causes the oil to quickly flow into the oil return passage 7 through the projection 512 when the oil flows through the cylinder head 5. The circulation filtration is carried out to effectively avoid the accumulation of oil in the cylinder head 5, thereby avoiding the residual of impurities in the oil and causing wear of the machine parts or abnormal noise during long-term operation, so that the object of the present invention can be achieved. However, the above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention. All remain within the scope of the invention patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational cross-sectional view showing a state of a depressed portion in a cylinder head of a conventional engine; 201107588 FIG. 2 is a side cross-sectional view showing a preferred embodiment of a cylinder head of an engine of the present invention. 3 is a side cross-sectional view of FIG. 2, which is a different cross-sectional view from FIG. 2, and FIG. 4 is a front view of the first preferred embodiment. ...: head: the aspect of the projection, the cylinder head cover is omitted in this figure; Fig. 5 is a cross-sectional view showing the preferred embodiment of the material of the present invention.印叼弟201107588 [Main component symbol description] 100 axis 514 upper inclined section 101 vertical line 515 lower inclined section 2 engine 52 intake valve unit 3 crankcase 53 exhaust valve unit 4 cylinder block 54 auxiliary unit 5 cylinder head 541 heat sink fin Sheet 51 cylinder head body 55 oil hole 511 surrounding wall 6 cylinder head cover 512 projection 7 oil return passage 513 inner recess 8 air hood cover 10