201028301 六、發明說明： 【發明所屬之技術領域】 本發明與自行車、機車等相關的交通工具有關，特別 是有關於一種交通工具之輪圈，特別適用於自行車。 【先前技術】 傳統用於自行車、摩托車或其他運輸工具的輪圈都是 由鋁合金擠型或軋鋼所製成。這兩種製法都是將長條狀的 Φ 銘合金或鋼材滾壓成圓箍狀後’將兩端利用銷接或焊接加 以固定’最後再鑽出複數銅頭孔與一氣嘴孔，分別供鋼絲 銅頭與氣嘴穿置。 就焊接式的輪圈而言，輪圈在焊接處的強度往往都比 其他位置的強度脆弱，且為了消除輪圈因焊接所產生的不 規則表面，輪圈的焊接處通常會再經過拋光處理，但是經 過拋光處理後，會削薄焊接處的厚度而更惡化焊接處的強 度，使得輪圈受到過大的外力時容易從焊接處損壞。 就銷接式的輪圈而言，雖然不需要進行拋光處理，但 A當輪圈受到強烈的撞擊時，將造成輪_斷面產生拉伸 ㈣’使制以結合輪目之結合銷往往紐承受過大的張 力作用，導致輪圈可能從銷接處分離。 另一方面，當輪圈進行銅頭孔與氣嘴孔的鑽鑿時，鑽 頭=尖端所抵靠的位置是呈現v形斜面，使得鐵頭之尖端 很谷易產生’月動’導致鑽孔作業的準確度會受到景多響。 3 201028301 【發明内容】 本發明之主要目的在於提供一種交通工具之輪圈，其 結構簡單，且結構強度高。 八 本發明之次一目的在於提供一種交通工具之輪圈，其 可避免鑽頭在祕時產生滑動，用以提升鑽孔的精準度。 為達成上述目的，本發明所提供之輪圈包含有一第一 裒形底壁、一側壁、一第二環形底壁與四結合銷。該等侧 壁分別由該第一環形底壁之兩相對側向上延伸，並於其兩 知刀别具有一凸緣，各該凸緣具有一穿孔；該第二環形底 壁環繞於該第-環職壁之外緣，並以其軸對側分別連 接該等側壁；該等結合銷分別穿設於該等側壁之穿孔中， 並分別以其外周面迫緊該等穿孔之孔壁，用以提供本發明 之輪圈良好的結構強度。 在本發明之實施例中，該第一環形底壁的中段與該第 二環形底壁的中段分別具有一脊部與二定位凹部，用以提 供鑽頭之尖端良好的定位效果，使鑽頭之尖端在進行鑽孔 時不會產生滑動，確保鑽孔作業的精準度。 【實施方式】 兹配合圖式列舉以下較佳實施例，用以對本發明之結 構及功效進行詳細說明。 請參閱第一圖與第二圖，為本發明一較佳實施例所提 供之輪圈（10) ’包含有一第一環形底壁(20)、二側壁(30)、 一第二環形底壁(4〇)與四結合銷(50)。 4 201028301 請配合參閱第三圖，第一環形底壁（20)具有一左段 (22)、一中段(24)與一右段(26)。中段(24)形成一弧狀的第 一脊部(242) ’使第一脊部(242)的左右兩端與左段(22)及右 段(26)的交界處分別形成一第一定位凹部(244);另外，左 段(22)與右段(26)分別具有一肩部(28)，該等肩部(28)分別 鄰接該等第一定位凹部(244)。 該等側壁(30)分別由第一環形底壁(2〇)之左段(22)與右 段(26)的末端向上延伸，並於其頂底兩端分別具有一凸緣 # (32)，各凸緣(32)具有一穿孔(34)。 第二環形底壁(4〇)環繞於第一環形底壁(20)之外緣，並 具有一左段(42)、一中段(44)與一右段(46)。中段(44)具有 一弧狀的第二脊部(441)，第二脊部(441)對應第一脊部 (242)，且第二脊部(441)的左右兩端與左段(42)及右段(46) 的交界處分別形成一第二定位凹部(443)，第二定位凹部 (443)對應第一定位凹部(244)，且第二定位凹部(443)及第一 定位凹部(244)所形成的連線(L1)與第二脊部(441)及第一 • 脊部(242)所連成的中心線(L2)之間具有一夾角（Θ)。夾角 (Θ)以11度為最佳角度’但不以11度為限。 该等結合銷（5〇)分別穿設於該等側壁（3〇)之穿孔(34) 中，並分別以其外周面迫緊該等穿孔(34)之孔壁。各結合 銷（50)之外周面可另設有螺紋或凸條，用以增加各結合銷 (50)與各穿孔(34)之孔壁之間的摩擦力。 經由上述結構可知，本發明之輪圈（1〇)係設計成内、 外兩層環形底壁(20，40)，並透過四個結合銷(5〇)加以結 5 201028301 合。為了提升各結合銷(50)之抗張強度，除了可在各結合 銷（50)之外周面形成螺紋或凸條等增加摩擦力的構造之 外，亦可在各側壁(30)之凸緣(32)表面進行點狀式的沖壓， 使各凸緣之表面將形成多數個凹點(36)，而各穿孔(34)之孔 壁則會於對應各凹點(36)的位置形成一凸點(38)，如第四圖 所示，該等凸點(38)將迫使該等穿孔(34)之斷面產生變形以 迫緊各結合銷(50)之外周面，讓本發明之輪圈（1〇)能夠獲得 良好的結構強度。 另一方面，當進行銅頭孔(6〇)的鑽鑿時，鐵頭（圖中未 示）可被疋位在第二環形底壁(4〇)之第二定位凹部(443)，並 名著第二定位凹部(443)與第一定位凹部(244)所形成之連 線(L1)進行鑽孔作業，用以避免鑽頭產生滑動而有效提升 鑽孔作業的精準度；另外，當安裝銅頭（圖中未示)於銅頭 孔(60)時，銅頭可抵靠於第一環形底壁(2〇)之肩部(28)，用 以確保每個銅頭在安裝之後能夠保持良好的穩定度。 本發明於前揭實施例中所揭露的構成元件，僅為舉例 說明，並非用來限制本案之範圍，其他等效元件的替代或 變化，亦應為本案之申請專利範圍所涵蓋。 6 201028301 【圖式簡單說明】 第一圖為本發明一較佳實施例之立體圖。 第二圖為本發明一較佳實施例之局部立體分解圖。 第三圖為本發明一較佳實施例之剖視圖。 第四圖為第三圖之局部放大圖，主要顯示凸點迫緊結 合銷之狀態。 【主要元件符號說明】201028301 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to bicycles, locomotives, and the like, and more particularly to a rim of a vehicle, particularly for bicycles. [Prior Art] The rims conventionally used for bicycles, motorcycles, or other transportation vehicles are all made of aluminum alloy extruded or rolled steel. In both methods, the long Φ-shaped alloy or steel is rolled into a round hoop shape, and the two ends are fixed by pinning or welding. Finally, a plurality of copper head holes and one nozzle hole are drilled, respectively. The copper wire is placed with the gas nozzle. In the case of welded rims, the strength of the rim at the weld is often weaker than the strength at other locations, and in order to eliminate the irregular surface of the rim due to welding, the weld of the rim is usually polished. However, after the polishing treatment, the thickness of the welded portion is thinned to deteriorate the strength of the welded portion, so that the rim is easily damaged from the welded portion when subjected to an excessive external force. As far as the pin-type rim is concerned, although it is not necessary to perform the polishing treatment, when the rim is subjected to a strong impact, the wheel-section will be stretched (four)', so that the combined pin of the combined wheel is often Excessive tension is applied, causing the rim to separate from the pin joint. On the other hand, when the rim performs the drilling of the copper head hole and the nozzle hole, the position where the drill bit=tip abuts is a v-shaped inclined surface, so that the tip of the iron head is easy to generate a 'monthly movement' and causes drilling. The accuracy of the assignment will be affected by the scene. 3 201028301 SUMMARY OF THE INVENTION The main object of the present invention is to provide a rim of a vehicle which has a simple structure and high structural strength. The second object of the present invention is to provide a rim of a vehicle which can prevent the drill bit from slipping at a secret time to improve the accuracy of the drill hole. To achieve the above object, the rim provided by the present invention comprises a first 底-shaped bottom wall, a side wall, a second annular bottom wall and four joint pins. The side walls respectively extend upward from opposite sides of the first annular bottom wall, and have a flange on each of the two sides, each flange has a perforation; the second annular bottom wall surrounds the first - the outer edge of the ring wall, and the side walls are respectively connected to the opposite sides of the shaft; the joint pins are respectively inserted in the perforations of the side walls, and the perforated holes are respectively pressed by the outer peripheral surface thereof, Used to provide a good structural strength of the rim of the present invention. In the embodiment of the present invention, the middle portion of the first annular bottom wall and the middle portion of the second annular bottom wall respectively have a ridge portion and two positioning recess portions for providing a good positioning effect of the tip of the drill bit, so that the drill bit is The tip does not slip when drilling, ensuring the accuracy of the drilling operation. [Embodiment] The following preferred embodiments are listed with reference to the drawings to explain the structure and function of the present invention in detail. Referring to the first and second figures, a rim (10)' according to a preferred embodiment of the present invention includes a first annular bottom wall (20), two side walls (30), and a second annular bottom. Wall (4〇) and four joint pins (50). 4 201028301 Please refer to the third figure. The first annular bottom wall (20) has a left section (22), a middle section (24) and a right section (26). The middle section (24) forms an arc-shaped first ridge (242)' to form a first positioning of the boundary between the left and right ends of the first ridge (242) and the left section (22) and the right section (26), respectively. The recess (244); in addition, the left section (22) and the right section (26) respectively have a shoulder portion (28) that abuts the first positioning recesses (244), respectively. The side walls (30) respectively extend upward from the ends of the left section (22) and the right section (26) of the first annular bottom wall (2), and have a flange # at each of the top and bottom ends thereof (32). Each flange (32) has a perforation (34). The second annular bottom wall (4 turns) surrounds the outer edge of the first annular bottom wall (20) and has a left section (42), a middle section (44) and a right section (46). The middle section (44) has an arc-shaped second ridge (441), the second ridge (441) corresponds to the first ridge (242), and the left and right ends of the second ridge (441) and the left section (42) And a second positioning recess (443) is formed at the junction of the right segment (46), the second positioning recess (443) corresponds to the first positioning recess (244), and the second positioning recess (443) and the first positioning recess (244) The formed line (L1) has an angle (Θ) between the second ridge (441) and the center line (L2) of the first ridge (242). The angle (Θ) is 11 degrees is the best angle ' but not limited to 11 degrees. The coupling pins (5〇) are respectively inserted into the through holes (34) of the side walls (3〇), and the outer peripheral surfaces thereof are respectively pressed against the hole walls of the perforations (34). The outer peripheral surface of each of the coupling pins (50) may be additionally provided with a thread or a rib to increase the friction between the respective coupling pin (50) and the hole wall of each of the perforations (34). According to the above structure, the rim (1 〇) of the present invention is designed as an inner and outer annular bottom wall (20, 40), and is joined by four joint pins (5 〇). In order to increase the tensile strength of each of the joint pins (50), in addition to the formation of a frictional force such as a thread or a ridge on the peripheral surface of each of the joint pins (50), the flange of each side wall (30) may be used. (32) The surface is punched in a dot shape so that a plurality of pits (36) are formed on the surface of each of the flanges, and the wall of each of the perforations (34) is formed at a position corresponding to each of the pits (36). Bumps (38), as shown in the fourth figure, the bumps (38) will force the sections of the perforations (34) to deform to force the outer circumference of each of the bond pins (50), allowing the invention to The rim (1〇) is able to achieve good structural strength. On the other hand, when drilling a copper head hole (6 〇), an iron head (not shown) can be clamped on the second positioning recess (443) of the second annular bottom wall (4 〇), and The connection line (L1) formed by the second positioning recess (443) and the first positioning recess (244) is drilled to avoid the slippage of the drill bit and effectively improve the accuracy of the drilling operation; When the head (not shown) is in the copper head hole (60), the copper head can abut against the shoulder (28) of the first annular bottom wall (2〇) to ensure that each copper head can be installed after installation. Maintain good stability. The constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention. The alternative or variations of other equivalent elements are also covered by the scope of the patent application. 6 201028301 BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a perspective view of a preferred embodiment of the present invention. The second figure is a partial exploded perspective view of a preferred embodiment of the present invention. The third figure is a cross-sectional view of a preferred embodiment of the present invention. The fourth figure is a partial enlarged view of the third figure, mainly showing the state in which the bumps are forced to bond. [Main component symbol description]
輪圈（10) 第一環形底壁(20) 左段(22) 中段(24) 第一脊部(242) 第一定位凹部(244) 右段(26) 肩部(28) 側壁(30) 凸緣(32) 穿孔(34) 凹點（36) 凸點(38) 第二環形底壁(40) 左段(42) 中段(44) 第二脊部(441) 第二定位凹部(443) 右段(46) 連線(L1) 中心線(L2) 夾角（<9) 結合銷(50) 銅頭孔(60) 7Rim (10) First annular bottom wall (20) Left section (22) Middle section (24) First ridge (242) First positioning recess (244) Right section (26) Shoulder (28) Side wall (30 ) Flange (32) Perforation (34) Pit (36) Bump (38) Second annular bottom wall (40) Left segment (42) Middle segment (44) Second ridge (441) Second positioning recess (443 ) Right segment (46) Wire (L1) Center wire (L2) Angle (<9) Union pin (50) Copper head hole (60) 7