101.08.14. 第099129480號之說明書修正頁 '發明說明： 【發明所屬之技術領域】 本發明是有關於一種油箱蓋，且特別是有關於—種操作簡 易快速且兼具止漏、防塵作用的内燃裝置的油蓋。 【先前技術】 例如割草機、鼓風 使引擎點火燃燒以 目前可供手提的各類可攜式内燃裝置， 機、伐木機、鏈鋸、船外機......等，由於是 推動曲柄輸出動力 因此’必須要採用燃油來作為動力能源 而為了便於補充燃油，一般内燃裝置的油箱上皆會開設有一加 油口’並利用一塑膠材質的油箱蓋作塞設閉合。 且目前坊間的内燃裝置之油箱蓋結構，基於成本的考量之 下，大部分是採用内、外螺紋結構，使油箱蓋螺鎖在加油:上 作結合。 然而，以π 頌钱L]…、、可以獲得固定效果， 但是，最為消費者②病的使用問題在於’為了要克服螺紋段之 螺接關係’操作者必須-圈1地連續旋轉油箱蓋，直到脫離 或閉鎖為it，因此操作上非常的不便利之外，般油箱蓋也 不具有防漏結構’導㈣_裝置在搖晃_作難中，0容易 使油箱内的油液溢出之缺失，此外’油箱篕在螺出加油口之 後，因為沒有適當的置放位置，容易遺失。 另-種彈壓式㈣箱蓋’則是在加油口側邊樞設有一連 結頸’油箱蓋外緣與該連結頸g]接，纽用者欲打開油箱蓋 時’只要扳轉該連結頸上的—卡榫，就能使得彈簧推頂開油箱 蓋本體，使加油Π露出’但這種油箱蓋的缺點是不能防塵與防 101.08.14. 第099129480號之說明書修正頁 水，容易有異物或水液滲入油箱内，造成内燃裝置的損壞之虞。 【發明内容】 本發明之目的，即在提供一種操作簡易快速且兼具止漏、 防塵作用内燃裝置的油蓋。 依據本發明所提出之一種内燃裝置的油蓋，供安裝於一油 箱之一油箱口上。該油箱具有複數個設置於該油箱口周側的缺 口、一環設在該油箱口外側的外凸堤，以及一位於該油箱口與 該外凸堤之間的油蓋容室，該外凸堤頂面設有至少一定位凹 口。該油蓋包含有一油蓋本體、一制動件、一彈性件及一定位 件。該油蓋本體，具有一沿軸向延伸的本體部、一設置於該本 體部頂面的旋鈕部、一組裝槽穴、一滑合溝，以及複數個凸設 於該本體部底部外周側的卡塊，該組裝槽穴是沿徑向延伸開放 設置在該本體部與旋鈕部之間，而該滑合溝設置在該組裝槽穴 的槽壁上。該制動件，具有一可沿著該滑合溝的長方向進行滑 移的滑塊，以及一可縮設入該組裝槽穴中的撥板。該彈性件， 彈抵在該制動件的撥板與該油蓋本體之旋鈕部之間，以提供該 制動件被内縮後朝外滑移的能力，且常態下該制動件的滑塊受 該彈性件之彈力推抵而凸出於該油蓋本體之外周緣。該定位 件，固定於該油蓋本體之組裝槽穴，以遮閉該制動件的滑塊， 並擋止該撥板脫出該組裝槽穴，並且，該定位件與該旋鈕部之 間具有一空間，提供該制動件的撥板在該空間内作徑向位移。 當該油蓋本體的卡塊對應於該油箱之缺口，可使油蓋本體 穿入該油箱内，且使該制動件的滑塊對應於該油箱之定位凹口 101.08.14. 第099129480號之說明書修正頁 時，即可使該油蓋密閉該油箱口，而當内壓該制動件的撥板， 將致使該制動件的滑塊内缩至該滑合溝内，以便將該油蓋本體 脫離該油箱口。 依照上述本發明所提出之内燃裝置的油蓋，其中，更包含 一止漏環，該止漏環是環束在該油蓋本體之本體部的中段上。 依照上述本發明所提出之内燃裝置的油蓋，其中，該油蓋 本體更具有二個設置於該組裝槽穴内，且位於該滑合溝兩側的 鉤孔，而該定位件具有二個位於兩側的卡鉤部，以供卡固在前 述鉤孔上。 依照上述本發明所提出之内燃裝置的油蓋，其中，該油蓋 本體的組裝槽穴内更具有一位於該旋鈕部上的第一凹陷部，而 該制動件的撥板上具有一第二凹陷部，該彈性件的兩端分別組 裝至該第一凹陷部與該第二凹陷部上。 依照上述本發明所提出之内燃裝置的油蓋，其中，該油蓋 本體的卡塊具有一導斜面。 依照上述本發明所提出之内燃裝置的油蓋，其中，該油箱 更具有一設置於該油箱口上的内凸堤，該油箱上的缺口是貫穿 該内凸堤。 依照上述本發明所提出之内燃裝置的油蓋，其中，更包含 一掛繩，該掛繩具有一定位段、一連接段及一擴張段，該油蓋 本體更具有一位於該本體部底面的卡槽，該掛繩的定位段前端 具有一圓球部，該圓球部是塞固於該卡槽内，該掛繩的連接段 是一撓性繩，其連接在該定位段與擴張段之間，該擴張段具有 一擴張主體及自該擴張主體向外延伸的二彈性部，當壓縮該二 101.08.14. 第099129480號之說明書修正頁 彈性部可使得該擴張部塞置入該油箱口内部，當該二彈性部再 回復至原始狀態，則使得該擴張部被卡止在該油箱口内而不致 掉出。 如上所述，相較於現有油蓋以螺紋結構作鎖固，造成操作 不便與不具水密性的使用問題。由於本發明的油蓋利用簡易的 旋轉動作，快速地讓該制動件的滑塊與該油箱之定位凹部作定 位，不但增加了操作上之便利性，讓鎖固與鬆脫該油蓋時皆方 便又快速，而且，更藉由止漏環抵緊在該油箱之外凸堤的内壁 面，以獲得完全的防漏作用，避免内燃裝置在搖晃使用當中， 造成油液外溢。 【實施方式】 參照第1、2、3圖所示，本發明之内燃裝置的油蓋1〇〇， 供安裝於一油箱200之一油箱口 210上。 該油箱200，更具有一設置於該油箱口 210上的内凸堤 220、複數個設置於該油箱口 210周側且貫穿該内凸堤220的 缺口 230、一環設在該油箱口 210外側的外凸堤240，以及一 位於該油箱口 210與該外凸堤240之間的油蓋容室250，該外 凸堤240的頂面241設有一定位凹口 260。 該油蓋100包含有一油蓋本體10、一制動件20、一彈性 件30、一定位件40及一掛繩60。 該油蓋本體10，具有一沿軸向延伸的本體部Η、一設置 於該本體部11頂面的旋鈕部12、一組裝槽穴13、一滑合溝14、 複數個凸設於該本體部11底部外周側的卡塊15、二設置於該 101.08.14. 第099129480號之說明書修正頁 組裝槽六13内且位於該滑合溝14兩側的鉤孔16。該組裝槽穴 13是沿著徑向延伸開放設置在該本體部11與旋鈕部12之間， 而該滑合溝14設置在該組裝槽穴13的槽壁131上。該油蓋本 體10更包含一止漏環17,而該本體部11中段處設有一凹溝 18,該止漏環17是環束在該凹溝18上。此外，該油蓋本體10 的組裝槽穴13内更具有一位於該旋鈕部12上的第一凹陷部 19 ° 該制動件20，截面概呈L形，具有一可沿著該滑合溝14 的長方向進行滑移的滑塊21、一可縮設入該組裝槽穴13中的 撥板22,以及一位於該撥板22上且對應該第一凹陷部19的第 二凹陷部23。 該彈性件30,是為一壓縮彈簧，且兩端恰被限位在該第一 凹陷部19與該第二凹陷部23之間，以提供該制動件20被内 縮後朝外滑移的能力，且常態下該制動件20的滑塊21受該彈 性件30之彈力推抵而凸出於該油蓋本體10之外周緣。 該定位件40，以塑膠材料製成而概呈倒U型，且是固定 於該油蓋本體10之組裝槽穴13,以覆蓋住該制動件20的滑塊 21，且該定位件40具有二個位於兩側的卡鉤部41，以供卡掣 在該油蓋本體10之鉤孔16上，使該定位件40形成止擋該撥 板22，以防止該制動件20由徑向脫出該滑合溝14。 另外，參照第8圖與第9圖，該定位件40與該旋鈕部12 之間具有一空間50，提供該制動件20的撥板22在該空間50 内作徑向位移，其操作情形容後詳述。 第099129480號之說明書修正頁 101.08.14. 參照第1、2圖所示，該掛繩60，具有一定位段61、一 連接段62及一擴張段63。該油蓋本體10更具有一位於該本體 部11底面的卡槽19卜該掛繩60的定位段61前端具有一圓球 部611，該圓球部611是緊迫方式塞固於該卡槽191内，以使 該掛繩60的前端與該油蓋本體10固定連接。而該掛繩60的 連接段62是一撓性繩，其連接在該定位段61與擴張段63之 間。該擴張段63具有一擴張主體631及自該擴張主體631向 外延伸的二彈性部632。當壓縮該二彈性部632可使得該擴張 部63塞置入該油箱口 210内部，當該二彈性部632再回復至 原始狀態（見第1圖），則使得該擴張部63被卡止在該油箱口 210内而不致掉出，以作為該油蓋100自該油箱200的油箱口 210卸離時，油蓋100可暫時吊掛在油箱口 210 —側，以利於 再次鎖上油箱口 210之便利性，且不虞造成遺失。 在正常狀態，參照第4、6、8圖，該制動件20的滑塊 21受該彈性件30之彈力推抵而凸出於該油蓋本體10之本體部 11的外周缘，使操作者無法旋動該油蓋本體10。欲將該油蓋 100組裝於該油箱200之油箱口 210時，以手握住該油蓋100 的旋鈕部12,先將該油蓋本體10的本體部11沿軸向投置入該 油箱口 210内，並將該油蓋本體10的各該卡塊15對準各該缺 口 230，且穿入各該缺口 230。參照第5、7、9圖，接著， 旋轉該油蓋100，致使該滑塊21卡固於該油箱200之外凸堤 240的定位凹口 260上，這時該油蓋本體10的各該卡塊15不 101.08.14. 第099129480號之說明書修正頁 但錯開各該缺口 230而卡固在油箱口 210底部形成定位，而 且，不管内壓或外拉皆無法將油蓋本體10取出，因此能避免 油箱蓋輕易地被開啟，再者該本體部11的一頂緣111也搭接 在該外凸堤240的頂部241，該本體部11之位於凹溝18下方 的一中段凸緣112也搭接在該内凸堤220的頂部221，而該止 漏環17亦抵觸在該外凸堤240的一内壁面242上，形成良好 的止漏效果，以防止油箱200内部之油液外溢。 參照第1 0圖所示，由於該油蓋1〇〇組裝在該油箱200上 時，其制動件20的撥板22部分凸露出位於該旋鈕部12上的 滑合溝14外部，所以，當需要補充油液，而將該油蓋1〇〇自 該油箱200卸離時，只需按壓該撥板22，致使該撥板22在空 間50内位移進而隱藏至該滑合溝14内部，參照第1 1圖，並 使得該滑塊21脫離該外凸堤240上的定位凹口 260,而内縮至 該滑合溝14内部，此時彈性件30呈現壓縮狀態。參照第1 2 圖，此時再旋轉該油蓋100,致使各該卡塊15經旋轉而對應至 各該缺口 230(見第6圖），並抽出油蓋1〇〇，即可開啟油箱口 210。 值得一提的是，該油蓋本體1〇的每一個卡塊15分別具有 一導斜面151，藉此，當油蓋本體10施以旋轉之鎖固動作時， 各該卡塊15可藉其導斜面151之導引，使更順利地卡設於該 油箱口 210之底部。 經由上述說明，相較於現有油蓋以螺紋結構作鎖固，造成 操作不便與不具水密性的使用問題。由於本發明的油蓋利 101.08.14. 第099129480號之說明書修正頁 用簡易的旋轉動作，快速地讓該制動件20的滑塊21與該油箱 200之定位凹部260作定位，不但增加操作上之便利性，讓鎖 固與鬆脫該油蓋100時皆方便又快速，而且，更藉由止漏環17 抵緊在該油箱200之外凸堤240的内壁面242，以獲得完全的 防漏、防塵作用，避免内燃裝置在搖晃使用當中，造成油液外 溢之問題。 惟以上所述者，僅為本發明之一個實施例而已，當不能以 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，皆應仍屬本發明專 利涵蓋之範圍内。 【圖式簡單說明】 第1圖係為本發明内燃裝置的油蓋一實施例的分解立體 圖，是顯示該油蓋、止漏環與油箱的分解圖。 第2圖係為本發明該油蓋與掛繩的分解立體圖。 第3圖係為該油蓋本體、制動件、彈性件與定位件的分解 立體圖。 第4圖係為一縱向剖視圖，是顯示該油蓋本體組裝於該油 箱上，且該制動件尚未與該油箱作卡固定位的使用情形。 第5圖係為另一縱向剖視圖，是顯示該油蓋本體組裝於該 油箱上，且使該制動件卡固定位於該油箱之定位凹口上的使用 情形。 第6圖係為一剖視圖，是顯示該油蓋本體的卡塊對應於該 油箱之缺口的使用情形。 1374218 第099129480號之說明書修正頁 101⑽μ 第7圖係為相類似於第6圖之另一别視圖，是顯示已自詨 等缺口穿伸入油箱内部，且令該油蓋本體的卡塊卡制在該油箱 口的使用情形。 第8圖係為一剖視圖，是顯示該油蓋本體的滑塊尚未卡固 於該油箱之定位凹口的使用情形。 第9圖係為相類似於第8圖之另一剖視圖，是顯示該油蓋 本體的滑塊卡固於該油箱之定位凹口的使用情形。 第1 0圖係為一頂視圖，是顯示該油蓋本體的滑塊卡固於 該油箱之定位凹口的使用情形。 第1 1圖係為相類似於第1〇圖之另一頂視圖，是顯示操 作該撥板以致使該撥板内縮至該油蓋本體之滑合溝内的使用 情形。 第1 2圖係為一剖視圖，是顯示該油蓋可自該油箱口卸離 的使用情形。 【主要元件符號說明】 100 油蓋 10 油蓋本體 11 本體部 111 頂緣 112 中段凸緣 12 旋鈕部 13 組裝槽穴 131 槽壁 14 滑合溝 15 卡塊 151 導斜面 16 鉤孔 17 止漏環 18 凹溝 19 第一凹陷部 191 卡槽 20 制動件 21 滑塊 22 撥板 23 第二凹陷部 1374218 101.08.14 第099129480號之說明書修正頁 30 彈性件 40 定位件 50 空間 60 掛繩 61 定位段 611 圓球部 62 連接部 63 擴張部 631 擴張主體 632 彈性部 200 油箱 210 油箱口 220 内凸堤 221 頂部 230 缺口 240 外凸堤 241 頂部 242 内壁面 250 油蓋容室 260 定位凹部 12101.08.14. Specification Revision No. 099129480 'Invention>: TECHNICAL FIELD OF THE INVENTION The present invention relates to a fuel tank cap, and in particular to a simple and quick operation, which has both a leak-proof and a dust-proof effect. The oil cap of the internal combustion unit. [Prior Art] For example, lawn mowers and blasts ignite the engine with various types of portable internal combustion devices, machines, fellers, chainsaws, outboards, etc. Pushing the crank output power therefore 'must use fuel as the power source. In order to facilitate the refueling, the fuel tank of the internal combustion device will have a fuel filler port' and use a plastic fuel tank cap for plugging and closing. At present, the fuel tank cap structure of the internal combustion device in the workshop is mostly based on cost considerations, and the inner and outer thread structures are used to make the fuel tank cap screw lock on the fueling:. However, a fixed effect can be obtained by π 颂 L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L L Until the detachment or blocking is it, so the operation is very inconvenient, the fuel tank cap does not have a leak-proof structure. (4) _ The device is shaken _ trouble, 0 is easy to make the oil in the tank overflow, and 'The fuel tank is easily lost after it has been screwed out of the filler port because it is not properly placed. Another type of spring-loaded type (four) box cover is provided with a connecting neck on the side of the fuel filler port. The outer edge of the fuel tank cap is connected with the connecting neck g]. When the user wants to open the fuel tank cap, it is only required to turn the connecting neck. The card can push the spring to open the fuel tank cap body, so that the fuel filler is exposed. 'The disadvantage of this fuel tank cap is that it cannot be dustproof and protected. 101.08.14. The specification of No. 099129480 corrects the water, and it is easy to have foreign objects or The water penetrates into the fuel tank, causing damage to the internal combustion device. SUMMARY OF THE INVENTION It is an object of the present invention to provide an oil cap that is easy and quick to operate and that has both a leak-proof and dust-proof internal combustion device. An oil cap of an internal combustion apparatus according to the present invention is mounted on a fuel tank port of a fuel tank. The oil tank has a plurality of notches disposed on a circumferential side of the tank mouth, an outer bulge disposed on an outer side of the tank port, and an oil cap chamber located between the tank port and the outer bank, the outer levee The top surface is provided with at least one positioning recess. The oil cap comprises a cap body, a brake member, an elastic member and a positioning member. The oil cap body has a body portion extending in the axial direction, a knob portion disposed on the top surface of the body portion, an assembly slot, a sliding groove, and a plurality of protrusions disposed on the outer peripheral side of the bottom portion of the body portion The clamping block is disposed radially extending between the body portion and the knob portion, and the sliding groove is disposed on the groove wall of the assembly slot. The brake member has a slider that is slidable along the longitudinal direction of the sliding groove, and a dial that can be retracted into the assembly slot. The elastic member is elastically struck between the dial of the brake member and the knob portion of the oil cap body to provide the ability for the brake member to be retracted and then slide outward, and the slider of the brake member is normally subjected to The elastic force of the elastic member is pushed against the outer periphery of the oil cap body. The positioning member is fixed to the assembly slot of the oil cap body to block the slider of the brake member, and blocks the dial plate from coming out of the assembly slot, and the positioning member and the knob portion have A space in which the dial of the brake member is radially displaced in the space. When the block of the oil cap body corresponds to the gap of the oil tank, the oil cap body can be inserted into the oil tank, and the slider of the brake component corresponds to the positioning recess of the fuel tank 101.08.14. No. 099129480 When the manual corrects the page, the oil cap can be sealed to close the tank mouth, and when the dial of the brake member is pressed internally, the slider of the brake member is caused to be retracted into the sliding groove, so as to cover the oil cap body. Get out of the tank mouth. The oil cap of the internal combustion apparatus according to the present invention described above further includes a leak stop ring which is a ring bundle on a middle portion of the body portion of the oil cap body. According to the oil cap of the internal combustion device of the present invention, the oil cap body further has two hook holes disposed in the assembly groove and located on opposite sides of the sliding groove, and the positioning member has two positions. The hook portions on both sides are fastened to the aforementioned hook holes. According to the oil cap of the internal combustion device of the present invention, the assembly cavity of the oil cap body further has a first recessed portion on the knob portion, and the dial plate of the brake member has a second recess. The two ends of the elastic member are respectively assembled to the first recess portion and the second recess portion. According to the oil cap of the internal combustion apparatus proposed by the present invention, the block of the oil cap body has a guide slope. According to the oil cap of the internal combustion device of the present invention, the oil tank further has an inner bulge disposed on the port of the fuel tank, and a notch in the oil tank penetrates the inner levee. The oil cap of the internal combustion device according to the present invention further includes a lanyard having a positioning section, a connecting section and an expanding section, and the oil cap body further has a bottom surface of the body portion. a card slot, the front end of the positioning section of the lanyard has a ball portion, the ball portion is fastened in the card slot, and the connecting portion of the lanyard is a flexible rope connected to the positioning segment and the expansion segment The expansion section has an expansion body and two elastic portions extending outward from the expansion body. When the two 101.08.14. No. 099129480 is modified, the elastic portion can be inserted into the tank mouth. Internally, when the two elastic portions are returned to the original state, the expansion portion is locked in the tank mouth without falling out. As described above, the locking of the existing oil cap with a threaded structure results in inconvenient operation and non-watertight use problems. Since the oil cap of the present invention uses a simple rotating action to quickly position the slider of the brake member and the positioning concave portion of the oil tank, the operation convenience is increased, and the lock is secured and loosened. It is convenient and fast, and further, the leakage preventing ring is pressed against the inner wall surface of the levee outside the oil tank to obtain a complete leakproof function, and the internal combustion device is prevented from being shaken during use, thereby causing oil to overflow. [Embodiment] Referring to Figures 1, 2, and 3, the oil cap 1 of the internal combustion apparatus of the present invention is attached to a tank port 210 of a tank 200. The fuel tank 200 further has an inner bulge 220 disposed on the tank port 210, a plurality of notches 230 disposed on the circumferential side of the tank port 210 and extending through the inner levee 220, and a ring disposed outside the tank port 210. An outer bulge 240, and an oil cap chamber 250 between the tank port 210 and the outer bulge 240. The top surface 241 of the outer bulge 240 is provided with a positioning recess 260. The oil cap 100 includes a cap body 10, a brake member 20, an elastic member 30, a positioning member 40, and a lanyard 60. The oil cap body 10 has a body portion extending in the axial direction, a knob portion 12 disposed on the top surface of the body portion 11, an assembly slot 13, a sliding groove 14, and a plurality of protrusions on the body The blocks 15 and 2 on the outer peripheral side of the bottom portion of the portion 11 are provided in the hook holes 16 in the assembly groove 6 13 of the 101.08.14. No. 099129480 and located on both sides of the sliding groove 14. The assembly slot 13 is openly disposed between the body portion 11 and the knob portion 12 in a radial direction, and the sliding groove 14 is disposed on the groove wall 131 of the assembly slot 13. The oil cap body 10 further includes a leak stop ring 17, and a groove 18 is formed in the middle portion of the body portion 11, and the leak stop ring 17 is a ring bundle on the groove 18. In addition, the assembly recess 13 of the oil cap body 10 further has a first recessed portion 19 on the knob portion 12. The brake member 20 has an L-shaped cross section and has a sliding groove 14 therebetween. The slider 21 that slides in the long direction, a dial 22 that can be retracted into the assembly slot 13, and a second recess 23 that is located on the pad 22 and corresponds to the first recess 19. The elastic member 30 is a compression spring, and both ends are constrained between the first recess portion 19 and the second recess portion 23 to provide the brake member 20 to be retracted and then outwardly slipped. The ability, and normally, the slider 21 of the brake member 20 is pushed against the outer periphery of the oil cap body 10 by the elastic force of the elastic member 30. The positioning member 40 is made of a plastic material and is generally inverted U-shaped, and is fixed to the assembly slot 13 of the oil cap body 10 to cover the slider 21 of the brake member 20, and the positioning member 40 has Two hook portions 41 are disposed on the two sides of the hook portion 16 of the oil cap body 10, so that the positioning member 40 forms a stop for the dial 22 to prevent the brake member 20 from being detached from the radial direction. The sliding groove 14 is taken out. In addition, referring to FIG. 8 and FIG. 9, a space 50 is provided between the positioning member 40 and the knob portion 12, and the dial 22 of the brake member 20 is radially displaced in the space 50, and the operation condition thereof is accommodated. Detailed later. The instruction sheet of No. 099129480 is amended. 101.08.14. Referring to Figures 1 and 2, the lanyard 60 has a positioning section 61, a connecting section 62 and an expanding section 63. The oil cap body 10 further has a card slot 19 on the bottom surface of the main body portion 11. The front end of the positioning portion 61 of the lanyard 60 has a ball portion 611, and the ball portion 611 is firmly inserted into the card slot 191. The front end of the lanyard 60 is fixedly coupled to the oil cap body 10. The connecting section 62 of the lanyard 60 is a flexible cord that is coupled between the positioning section 61 and the expanding section 63. The expansion section 63 has an expansion body 631 and two elastic portions 632 extending outward from the expansion body 631. When the two elastic portions 632 are compressed, the expansion portion 63 can be inserted into the inside of the tank port 210, and when the two elastic portions 632 are returned to the original state (see FIG. 1), the expansion portion 63 is locked at When the oil cap 100 is detached from the fuel tank port 210 of the oil tank 200, the oil cap 100 can be temporarily hung on the side of the fuel tank port 210 to facilitate locking the tank port 210 again. Convenience, and does not cause loss. In the normal state, referring to Figures 4, 6, and 8, the slider 21 of the brake member 20 is pushed against the outer periphery of the body portion 11 of the oil cap body 10 by the elastic force of the elastic member 30 to operate. The cap body 10 cannot be rotated. When the oil cap 100 is to be assembled to the tank port 210 of the oil tank 200, the knob portion 12 of the oil cap 100 is held by hand, and the body portion 11 of the cap body 10 is first placed axially into the tank port. In the 210, each of the blocks 15 of the cap body 10 is aligned with each of the notches 230 and penetrates into the notches 230. Referring to Figures 5, 7, and 9, then, the oil cap 100 is rotated, so that the slider 21 is clamped to the positioning recess 260 of the convex bank 240 outside the oil tank 200, at which time the card of the oil cap body 10 Block 15 is not 101.08.14. The specification page of No. 099129480 is offset from each of the notches 230 and is fixed at the bottom of the tank port 210 to form a position, and the oil cap body 10 cannot be taken out regardless of internal pressure or external pulling, so The fuel tank cap is prevented from being easily opened. Further, a top edge 111 of the main body portion 11 is also overlapped on the top portion 241 of the outer shroud 240. The middle portion flange 112 of the main body portion 11 below the recessed groove 18 is also It is connected to the top 221 of the inner levee 220, and the leakage preventing ring 17 also abuts against an inner wall surface 242 of the outer bulge 240 to form a good leak stopping effect to prevent oil inside the oil tank 200 from overflowing. Referring to FIG. 10, since the oil cap 1 is assembled on the oil tank 200, the dial 22 of the brake member 20 is partially exposed outside the sliding groove 14 on the knob portion 12, so The oil is required to be replenished, and when the oil cap 1 is detached from the oil tank 200, only the dial 22 is pressed, so that the dial 22 is displaced in the space 50 and hidden inside the sliding groove 14, with reference to In the first embodiment, the slider 21 is disengaged from the positioning recess 260 on the outer bulge 240 and is retracted into the interior of the sliding groove 14, at which time the elastic member 30 assumes a compressed state. Referring to FIG. 2, the oil cap 100 is rotated again, so that each of the blocks 15 is rotated to correspond to each of the notches 230 (see FIG. 6), and the oil cap 1 is pulled out to open the tank port. 210. It is worth mentioning that each of the blocks 15 of the oil cap body 1 has a guiding slope 151, whereby each of the blocks 15 can be used when the oil cap body 10 is subjected to a rotating locking action. The guide bevel 151 is guided to be more smoothly snapped to the bottom of the tank port 210. Through the above description, the existing oil cap is locked with a threaded structure, resulting in inconvenient operation and non-watertight use problems. Since the correction sheet of the oil cover 101.08.14. No. 099129480 of the present invention uses a simple rotation action to quickly position the slider 21 of the brake member 20 and the positioning recess 260 of the oil tank 200, the operation is increased. The convenience is convenient and fast for locking and loosening the oil cap 100, and further, the inner wall surface 242 of the convex dam 240 is secured by the leakage preventing ring 17 to obtain complete protection. Leakage and dust prevention to avoid the problem of oil spillage caused by the internal combustion device being shaken. However, the above is only one embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are all It should remain within the scope of this invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing an embodiment of an oil cap of an internal combustion apparatus of the present invention, showing an exploded view of the oil cap, the leak preventing ring and the oil tank. Fig. 2 is an exploded perspective view of the oil cap and the lanyard of the present invention. Fig. 3 is an exploded perspective view of the oil cap body, the brake member, the elastic member and the positioning member. Figure 4 is a longitudinal cross-sectional view showing the use of the oil cap body assembled to the fuel tank and the brake member has not been fixed to the fuel tank. Figure 5 is another longitudinal cross-sectional view showing the use of the oil cap body assembled to the fuel tank and for securing the brake member to the positioning recess of the fuel tank. Figure 6 is a cross-sectional view showing the use of the block of the oil cap body corresponding to the gap of the fuel tank. 1374218 Specification No. 099129480 Revision 101 (10) μ Figure 7 is another view similar to Figure 6, which shows that the gap has been inserted into the tank from the gap and the block of the oil cap body is clamped. The use of the tank mouth. Figure 8 is a cross-sectional view showing the use of the slider of the oil cap body that has not yet been secured to the positioning recess of the fuel tank. Fig. 9 is a cross-sectional view similar to Fig. 8 showing the use of the slider of the oil cap body to be engaged with the positioning recess of the fuel tank. Figure 10 is a top view showing the use of the slider of the oil cap body to be engaged with the positioning recess of the fuel tank. Fig. 1 is another top view similar to Fig. 1 showing the use of the pad to cause the pad to retract into the sliding groove of the cap body. Figure 12 is a cross-sectional view showing the use of the oil cap to be detached from the tank port. [Main component symbol description] 100 Oil cap 10 Oil cap body 11 Main body part 111 Top edge 112 Middle section flange 12 Knob part 13 Assembly groove 131 Slot wall 14 Sliding groove 15 Block 151 Leading slope 16 Hook hole 17 Stop leak ring 18 groove 19 first recessed portion 191 card slot 20 brake member 21 slider 22 dial plate 23 second recessed portion 1374218 101.08.14 manual 099129480 revision sheet 30 elastic member 40 positioning member 50 space 60 lanyard 61 positioning segment 611 Ball portion 62 Connection portion 63 Expansion portion 631 Expansion body 632 Elastic portion 200 Oil tank 210 Fuel tank port 220 Inner bank 221 Top 230 Notch 240 Outer bank 241 Top 242 Inner wall surface 250 Oil cover chamber 260 Positioning recess 12