M367870 五、新型說明： 【新型所屬之技術領域】 本創作係與自行車的管件有關， 近 尤L一種可使車輪與中管貼 以避免行輯產生雜之自行車巾管構造。 【先前技術】 按’自行車車架的中管1，係位於前輪2與後輪3之間’且位 Γ塾4下方，肋支撐人體重量的管件，其帽競賽用的自行 車’所制的中管1其截面會以水滴狀為造形，可以其水滴流線 造形降低風阻，但在實際使用上會造成前、後輪2、3之距離增長， 導致車架強度減弱如「圖丨」所示，主要是水餘截面的中管i 係以尖狀向前延伸，而後輪3為避免受其干擾，則要向後設立以 保一定距離’如財獻前輪2與後輪3之轉，造成車體強度 變弱’並且在高速行駛下，中管1與後輪3間容易產生紊流，如 「圖2」所示’而在高速行駛中若^絲流會使車身出現搖晃偏 擺，導致操控困難問題。 另外，習知製造成形此種非等徑圓管之自行車的中管卜是利 用模具以-上模與-下模對合，轉上模向下_，使上、下模 内部凹設賴穴形狀，可使成形後的中管〗，具有不哪狀的截 面，及具有内凹或外凸的管壁造形。 但是以上、下模對合衝出的中f〗f件，會形成兩條轴向延 伸的接縫，頌再經過焊接及研磨加卫程序才能完成，而顯得十 分費時費工’重要的是在兩條接縫處會有強赫足之_羞生。 M367870 【新型内容】 …爰此本創作主要目的在於提出一種自行車液壓成形管件， 及g件可為自仃車中管並以液壓成形’使其具有不同形狀的截面 及無接缝，*具足夠強度及減少㈣加卫之麻煩，並可使後車 與中管貼近，以避免行進產生紊流。 #經由以上可知，為達上述目的，本創作一種自行車液壓成形 2件n官件，該管件可為自行車的中管，係由中空的一 鲁管胚置入於-對上、下模内，並灌注流體於該管胚内，再對該管 胚兩猶壓使該流體形成高壓，以使該管胚的管壁向外擴張膨二 並形成有-弧形凹槽，該弧形凹槽係供一後車輪之前緣略為嵌入。 本創作至少具有下列之優點： 卜當自行車高速行駛，空驗動可贈巾管水滴形截面流 動’直接流動至後車輪的内緣，而使得整個空流十分流暢，可降 低風阻，達成自行車快速行進敎雜之功效。 鲁2、本_之巾管具有弧形凹槽供後車輪嵌人，如此可避免擴 -增該前、後車輪之距離，進而可保持車距固定，以維持自行車之 .車架強度。 3、本創作巾管_由管胚置於上、下翻，_之後先將流 體（=油液）灌入管胚内，再利用上、下模兩端的壓紅推送，形 成高麼油液，令該管胚依成形模穴形狀向外擴張膨脹成形出來， 可達無接縫及具有不同形狀之_，因此與習知的自行車中管相 比’可具足夠之強度及減少後續加卫之麻煩。 M367870 【實施方式】 兹有關本創作的詳_容及技術說明，現以實施例來作進一 \說月1_應瞭解的疋，該等實施例僅為例示說明之用，而不應 被釋為本創作實施之限制。 ^參閱「圖3、4」及「圖5」所示，「圖3」係本創作自行車 中&的立體圖、「圖4」係本創作實施於自行車之平面示意圖、「圖 」係本創作藉液壓成形之平面示意圖丨本創作一種自行車液壓 • 成形管件，係包含： 5件違t*件可為自行車轉的巾管，該巾管⑺係經抽 拉，將中空的官胚a抽拉成截面為水滴形，且一端管徑係縮束成 圓开v再經壓製，將前述之管胚a置入一上模具與一下模具（圖未 下）内’邊上模具係向下衝壓該下模具，使該管胚&之管壁具有一 弧形凹槽11的_ ’接著將該恤取出並依—定長度進行裁切， 再進行後續的液壓成形步驟。 • 魏壓成形步驟，係將該管胚a置入一上模b與一下模(：内’該 -上下模b、c對合後内部的模穴，設有與成形後之中管⑺相對應 * ^輪廓形狀’該上、下模b、c之左右兩端各設-壓缸d，該管胚a 可灌入流體（如油液）’該對壓缸d可對該油液施壓，以使該管胚 a向外擴_脹’可再參閱「圖5」，俾依該上、下模b、c之模穴 成开7出無接縫及具有不同截面形狀的中管，並使成形後 的中f 10具有向内凹之該弧形凹槽11，該弧形凹槽11係相對於自 一車的後車輪2〇之剞緣位置，供該後車輪别略為嵌入於該中管 M367870 之弧形凹槽11内。 藉此，當本創作於實施時，自行車後車輪2G之前緣係可略為 嵌入於該中管10之弧形凹槽η内，且該中管1〇之截面可為水滴 ，且臨近雜車輪2G係騎狀延伸，如財自行車高速行驶，空 氣抓動可順著中官1〇水滴形截面流動，直接流動至該後車輪 的内緣如「目6」獅，使得前進時歧十分流暢，可降低風阻， 達成自行車快速行進，穩定操控之功效。 八人，再參閱「圖3、4」所示，由於本創作之中管1〇係具有 弧形凹槽11供該後車㈣嵌人，如此可避免擴增該自行車前車 輪與後車輪20之轉，_可雜車距較，鱗持自行車之車 架強度。 值得-提的是，本創作中管1〇係藉由管胚a置於上、下模b、 c内’閉模之後先將油液灌人管胚_，再糊上、下模b、c兩 端的壓红d顧’使減具高壓令該管胚&依成賴穴形狀向外 擴張膨脹成形出來，可達無接縫及具有不同形狀之截面，因此與 習知的自行車的中管1概，可具足夠之強度及減少後續加工之 麻須。 准以上所述者’僅為本創作之較佳實施例而已，當不能以之 限定本創作實施之範圍，即大凡依本創作申請專利範圍所作之均 等變化與修飾，皆應仍屬本創作專利涵蓋之範圍内。 M367870 【圖式簡單說明】 圖1，係習知中管實施於自行車之平面示意圖。 圖2，係習知中管行進狀態示意圖。 圖3，係本創作自行車中管的立體圖。 圖4，係本創作實施於自行車之平面示意圖。 -圖5，係本創作藉液壓成形之平面示意圖。 •圖6，係本創作實施行進狀態示意圖。 •【主要元件符號說明】 習知部分 1 :中管 2 :前輪 3 .後輪 4 :座墊 本創作部分 • 10 :中管 .11 :弧形凹槽 .20 :後車輪 a :管胚 b :上模 c :下模 d :壓缸M367870 V. New description: [New technical field] The creation department is related to the bicycle fittings. It is a kind of bicycle towel tube structure that can make the wheel and the middle tube stick to avoid the miscellaneous. [Prior Art] Press the middle tube 1 of the bicycle frame, which is located between the front wheel 2 and the rear wheel 3, and under the position ,4, the rib supports the weight of the human body, and the cap is used for the bicycle. The cross-section of the tube 1 is shaped like a drop of water, and the shape of the drip stream can be reduced to reduce the wind resistance. However, in actual use, the distance between the front and rear wheels 2 and 3 increases, resulting in weakened frame strength as shown in the figure. The main pipe i of the water cross section extends forward in a pointed shape, and the rear wheel 3 is set up to avoid a certain distance to avoid a certain distance, such as the front wheel 2 and the rear wheel 3, resulting in a car. The body strength is weaker and the turbulent flow is easily generated between the middle pipe 1 and the rear wheel 3 at high speed, as shown in Fig. 2, and if the wire flow causes the body to sway and yaw during high-speed driving, Handling difficult problems. In addition, it is conventionally known that the middle tube of a bicycle for forming such a non-equal diameter pipe is made by using a mold to align the upper mold and the lower mold, and to rotate the upper mold downward, so that the upper and lower molds are recessed inside the lower mold. The shape can be such that the formed middle tube has a cross section without any shape, and a tube wall having a concave or convex shape. However, the upper and lower molds of the lower and lower molds will form two axially extending joints, which can be completed by welding and grinding and adding procedures, which is very time-consuming and labor-intensive. There will be strong sorrows at the two seams. M367870 [New content] ... The main purpose of this creation is to propose a bicycle hydroformed pipe fitting, and the g piece can be self-boring the middle tube and hydroformed 'to make it have different shapes of cross section and no seam, * is enough Strength and reduction (4) Trouble with the reinforcement, and make the rear car close to the middle pipe to avoid turbulence. # Through the above, in order to achieve the above purpose, the present invention creates a bicycle hydraulically formed 2 pieces of n-members, which can be a middle tube of a bicycle, which is placed in a pair of upper and lower molds by a hollow tube. And injecting a fluid into the tube embryo, and pressing the tube to pressurize the fluid to form a high pressure, so that the tube wall of the tube embryo expands outward and expands to form an arc-shaped groove. The front edge of the rear wheel is slightly embedded. This creation has at least the following advantages: When the bicycle is driving at a high speed, the empty inspection can send a towel-shaped drop-shaped cross-flow to directly flow to the inner edge of the rear wheel, so that the entire air flow is very smooth, the wind resistance can be reduced, and the bicycle can be quickly reached. The effect of noisy travel. Lu 2, the towel tube has a curved groove for the rear wheel to be embedded, so as to avoid the expansion - increase the distance between the front and rear wheels, and thus keep the distance fixed to maintain the strength of the bicycle. 3, the creation of the towel tube _ by the tube embryo placed up and down, _ after the first fluid (= oil) into the tube embryo, and then use the red pressure on both ends of the upper and lower mold to form a high oil, The tube embryo is expanded and expanded according to the shape of the forming cavity, and can be made without seams and having different shapes, so that it can have sufficient strength and reduce subsequent reinforcement compared with the conventional bicycle middle tube. trouble. M367870 [Embodiment] The details and technical descriptions of this creation are described in the following examples. The examples are for illustrative purposes only and should not be released. This is a limitation of the implementation of this creation. ^ See "Figures 3, 4" and "Figure 5", "Figure 3" is a perspective view of the bicycle in the creation of the bicycle, and "Fig. 4" is a schematic diagram of the creation of the bicycle in the plane, "picture" is the creation of this A schematic diagram of the hydraulic forming of the bicycle. A bicycle hydraulics • Forming pipe fittings, including: 5 pieces of t-pieces that can be used for bicycles, the towel tube (7) is pulled and the hollow official embryo a is pulled The cross-section is in the shape of a drop, and the end of the tube is reduced in a round shape and then pressed, and the aforementioned tube a is placed in an upper mold and a lower mold (not shown). The lower mold is such that the tube wall of the tube blank has an arcuate groove 11 and then the shirt is taken out and cut according to a predetermined length, followed by a subsequent hydroforming step. • The Wei press forming step is to place the tube a into an upper mold b and a lower mold (: inside the mold hole after the upper and lower molds b and c are combined, and the tube (7) is formed after the forming Corresponding to * ^ contour shape 'The upper and lower ends of the upper and lower molds b, c are respectively provided with a pressure cylinder d, which can be filled with a fluid (such as oil) 'the pressure cylinder d can apply the oil Pressing so that the tube blank a expands outwardly _ swells can be further referred to "Fig. 5", and the mold holes of the upper and lower molds b and c are opened to form a jointless tube and a middle tube having different cross-sectional shapes. And forming the formed middle f 10 with the arcuate groove 11 recessed inwardly, the arcuate groove 11 being relative to the rim position of the rear wheel 2 自 from a car for the rear wheel to be slightly embedded In the curved groove 11 of the middle tube M367870. Thereby, when the present invention is implemented, the front edge of the bicycle rear wheel 2G can be slightly embedded in the arcuate groove η of the middle tube 10, and the middle tube The cross section of 1〇 can be water droplets, and the 2G series of adjacent miscellaneous wheels are extended. If the bicycle is driving at a high speed, the air grip can flow along the water droplets of the Zhongguan 1〇 and flow directly into the rear wheel. For example, the "Ming 6" lion makes the forward movement very smooth, which can reduce the wind resistance, achieve the effect of rapid bicycle travel and stable control. Eight people, see "Figures 3 and 4", because of the creation of the tube 1 The rafter has an arcuate groove 11 for the rear vehicle (four) to be embedded, so as to avoid augmenting the rotation of the front wheel and the rear wheel 20 of the bicycle, the _ can be mixed with the car, and the strength of the frame of the bicycle is worth. In this creation, the tube 1 is made by placing the tube a in the upper and lower molds b and c. After the mold is closed, the oil is poured into the tube _, and then the upper and lower sides of the mold b and c are pasted. Pressing the red pressure to make the tube compact & It can have enough strength and reduce the hemp of subsequent processing. The above-mentioned ones are only the preferred embodiments of this creation, and when it is not possible to limit the scope of the implementation of this creation, that is, the patent application scope of this creation Equal changes and modifications shall remain within the scope of this Creative Patent. M367870 [Simplified illustration of the drawings] Fig. 1 is a schematic view of a conventional tube in a bicycle. Fig. 2 is a schematic view showing the traveling state of the tube in Fig. 2. Fig. 3 is a perspective view of the tube in the bicycle. This creation is implemented in the plane diagram of the bicycle. - Figure 5 is a schematic diagram of the hydraulic forming of the creation. Figure 6 is a schematic diagram of the implementation of the creation of the present creation. • [Main component symbol description] Conventional Part 1: Middle Tube 2 : Front wheel 3. Rear wheel 4: Seat cushion creation part • 10: Middle tube. 11: Curved groove. 20: Rear wheel a: Tube blank b: Upper mold c: Lower mold d: Pressure cylinder