200916369 九、發明說明： 【發明所屬之技術領域】 本發明係錢—種前變速11之改㈣構，_係指-_職速的自行 車前變速度及錢干涉之功效，並令鍵條 於最小直徑龍及最小餘鏈輪之狀軸作順暢者。 【先前技術】 按，台灣為世界最大自行車製造國家，台灣製造之高品f自行車更為世 所讚譽&於週休一日國人開始重視休閒活動，政府及民間機構推廣自 行車運動不遺餘力，因此自行車獅在_蔚域潮，自行林僅僅為交 通工具，更是-種競賽活動’因此在變速功能上的要求更顯的重要，如何 準確及穩疋職速功⑨，甚m無噪音的變速效果，較業界所追尋 的目t ’在自盯車運動及絲蓬勃發展之帶動下，各種符合人體工學及改 善變速功能之設計的自行車亦相繼問市。 習用前變速器之改良結構，請參閱美國專利案第7 〇 8工〇 5 8號，揭 示-種自行車前變速器’包含：—基座構件，形成為可連接於自行車車架； —可移動構件’具有—前端部，—後端部，形成為可在-第-位置與—第 二位置之間移_—鏈剌導部份；-第-連桿構件，包含可樞轉地連接 於該基座構件的-第-連接部份，及繞—第―轉軸線可樞轉地連接於該 可移動構件的-第二連接部份，該第一連桿構件具有—最向前表面及—最 向後表面，該最向前表面及該最向後表面沿著該第—連桿構件的該第—及 第二連接部份延伸；_第二連桿構件，包含可轉地連接於該基座構件的 200916369 第連接箱’及繞一第二樞轉軸線可掩轉地連接於該可移動構件的一 第二連接部份；及-驗齡，被設置在該第—樞娜紅，蛛常態下 將該可移動構射目躲該基輯件偏駐鱗—位置；當該輕速器被安 裝於自行車車架時’該偏賴件姆於該可移動構件至少部份地位於沿著 該第-連桿構件的該第-連接部份延伸的該第—連桿構件的該最向前表面 的區㈣刖方，該第二連桿構件的該第一連接部份包含可柩轉地連接於 〜座構賴崎元件的軸向姆端部的—對軸向間關的安裝元件。 習用結構提供自行車變速換檔之功能，並增加結構之剛性，減少各部件 之應力及㈣’但疋當鏈條於較小餘齒盤與較小直徑鏈輪狀態帶動時， 鏈條呈現歪斜狀態’故鏈條與前變速器之間存在著嚴重干涉的情形，如此 不但造成辆日杨噪音_，更因轩涉導_條、前變㈣之間的磨耗 門題久而久之’鏈條及讀速騎耗損導致結構之不穩定及破壞。 再者，鏈條於踩踏時，鏈條張施為強大，加上變速時，強制鏈條轉換 位置’致使讀速ϋ承受極高之應力，如何強化結構剛性亦為跳结構所 亟欲改善之課題。 是以，針對上述習用前變速器結構所存在之問題點，如何開發一種剛性 更佳且結構更制，使肢果更佳之觸結構，實消f者所殷切企盼，亦 係相關業者須努力研發突破之目標及方向； 有鑑於此，發明人本於多年從事相關產品之製造開發與設計經驗，針對 上述之目標，詳加設計與雜冊後，終得—確具實雜之本發明。 【發明内容】 200916369 本發明主要係提供一種前變速器之改良結構，其可改善習用前變速器結 構干涉及剛性不足問題，導致噪音、結構磨耗及變速不順暢等缺點。 為達成前述之發明目的，本發明主要係包括一基座、一第—連桿、一第 二連桿及—導鏈單元，其中：該第-連桿-端係拖接於基座，另-端樞接 於導鏈單元，該第二連桿一端係樞接於基座，另一端樞接於導鏈單元；該 導鏈單元設有-外導鏈>1及i導鏈片，該外導鏈片兩端倾内導鍵片相 連接，形成供鏈條穿設之-容置空間，該外導鏈片係設有—第—端面、一 第二端面及-第三端面’該第—端面係與前進方向呈—直線且與水平面呈 垂直，該第二端面係設於外導鏈片前端，該第二端面係與第—端面平行且 較第-端面為接近内導鏈片，該第三端面—端係與第二端面相接，該第三 端面另一端係朝遠離内導鏈片方向傾斜。 藉由該第二翻她鏈條，編鏈條由較A越趟麵至較小直徑齒 盤，並個該第-端面與第二端面之斷面落絲成立顏構，可強化整體 之剛性。 再者’當鏈條於較小直徑齒盤與較小直徑鏈輪狀·態帶動時，鍵條呈現歪 斜之狀態，藉由該第三端面與鏈條歪斜額平行，保持鏈條與外導鏈片之 間隙’故’避免產生結構干涉’如此不但可減少噪音，亦可克服結構之磨 耗問題。 是故’本發明改善了前變速器結構及功能上的諸多缺失，實是一種相各 具有實祕及進麵之創作，赠值得絲界來推廣，並公諸錄會 【實施方式】 200916369 本發明係有關於—種前變速器之改良結構，請參照第—_示，其本體 4 0係固设於-座管！Q下方，該本體4◦穿設—鏈條2◦於1中藉以 控制鏈條2 0轉換至較大直徑齒盤3 i丨或較小直徑缝3 i 2，續齡 照第二圖所示，騎乘時，藉由踩踏旋轉齒盤3 i，經由鏈條2◦傳動:鍵 輪3 2 ’進而帶動自行車前進，以齒盤31帶動鏈條2 〇前進之方向為前 方’反之為後方，當高速前進或低速紐時，可藉由前變速器及後變速器 (圖未示），分卿整鏈條2 〇於齒盤3 i或鏈輪3 2之位置，較大直 徑齒盤311或較小直徑齒盤3 i 2與較大直徑鏈輪3 2丄或較小直徑鏈 輪3 2 2搭配之不同齒數比，達到高速或省力之縣，當鏈條2 〇位於較 小直徑齒盤312與較小直徑鏈輪3 2 2之狀態作動時，鏈條2 〇呈現一 歪斜之狀態’而雜持直線狀態，制之結構無法克服此狀態產生之干涉 及噪音之問題，亦為本發明之創作重點。 本發明别變速器之改良結構，請參照第三圖及第四圖所示，該本體4 〇 係包括-基座4 1、-第-連桿4 2、-第二連桿4 3及-導鏈單元4 4， 其中： 該基座41係用以固定本體4 〇於座管1〇下方； 該第一連桿4 2—端係樞接於基座41，另一端樞接於導鏈單元4 4 ; 該第二連桿4 3—端係樞接於基座41，另一端樞接於導鏈單元4 4 ; 該導鏈單元4 4設有一外導鏈片4 41及一内導鏈片4 4 2，該外導鏈 片4 41兩端係與内導鏈片4 4 2相連接，形成供鏈條2 0穿設之一容置 空間4 5，該外導鏈片4 41係設有一第一端面4 410、一第二端面4 200916369 411、一第三端面4 412及一第四端面4 413，當鏈條2 〇呈直線 狀態時該第—端面4 410係與鏈條2 0平行，該第二端面44 i μ設 於外導鏈片441前端，該第二端面4 411係與第-端面44工〇平行 且較第一端面4 41◦為接近内導鏈片4 4 2，該第三端面4 412-端 係與第二端面4 411相接，該第三端面4 412另-端係朝遠離内導鏈 片4 4 2方向傾斜，該第四端面4 413與第三端面4 412相接，另一 端並朝内導鏈片4 4 2方向傾斜，該外導鏈片4 4 1係為is合金或碳纖維 材質一體製成以増加整體強度，再者，利用該第二端面4 411相對於第 一端面4 41〇為凹陷之狀態，形成立體結構，更能增強整體之剛性； 藉由該基座41、第一連桿42、第二連桿43及導鏈單元44形成四 連杯機構’該導鏈單元4 4可做適當之位移變化，當變速下樓時，該外導 鏈片4 41上第面4 41接觸鏈條2 〇並推抵，一般來說鏈條2 〇節 、、·、 A刀左右，且鏈條2 0為外鏈板與内鏈板之組合，以3倍節距之距 離最此確保第二端面4 41與外鏈板接觸，故該第二端面4 41長度為丄 公分至3公分為佳’該第三端面4 4工2同時導正鏈條2 〇往内方向，鍵 條2 〇順利於較大直徑齒盤311轉換至較小直徑齒盤312上，當鏈條 2 0於最小直控齒盤312及最小直徑鏈輪3 2 3之狀態時，鏈條2 〇呈 最大正斜之狀,4’該第三端面4 4 1 2係與鏈條2 G最大歪斜角度平行， 藉以保持間隙不至於產生干涉，避免結構磨耗之問題，但第三端面441 2並非無限制延伸’必須保持的長度，以2公分至5公分為佳，以避 免外導鏈#4 4 1與蝴或觸產生碰撞發生危險。 由上所述者僅為用以轉本發明之較佳實施例，並非企圖據以對本發明 9 200916369 做任何形式上之限制，是以，凡有在相同 &崎神下所做有關本發明之 任何修飾·更者’仍應包括在本發0聽_護之範嘴内。 …综上所述，本發明前變速器之改良結構在結構設計 '使用實用性及成本 j益上，確實是完讀合產業上發展職，且所聽之結構發明亦是具有 前所未有_新構造’所以其具有「卿性」應缺慮，又本發明可較習 去、、、。構更具功效之增進’因此亦具有「進步性」，其完全符合翻專利法有 關發明專利之中請要件的規^，乃依法提起專利中請，並敬請釣局早日 審查，並給予肯定。 200916369 【圖式簡單說明】 第一圖係本發明前變速器之改良結構之前視示意圖。 第二圖係前變速器、鏈條、齒盤與鏈輪相對關係之示意圖。 第三圖係本發明前變速器之改良結構之立體示意圖。 第四圖係第三圖線段AB之剖面示意圖。 【主要元件符號說明】 10- 座管 3 1- ——齒盤 3 12- ——較小直徑齒盤 3 2 1- 較大直徑鏈輪 3 2 3- ——最小直徑鏈輪 4 1- 基座 43- ——第二連桿 44 1- ——外導鏈片 44 10 —— 弟一知面 44 12 —— -第三端面 4 5-- ——容置空間 2 0- 鏈條 3 11- ——較大直徑齒盤 3 2- 鏈輪 3 2 2- 較小直徑鏈輪 40- ——本體 4 2- ——第一連桿 /1 Λ 夺3¾早兀 442- 内導鏈片 44 11 —— -第二端面 44 13 —— -第四端面 11200916369 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to the modification of the front-shift 11 of the money-type (four) structure, the function of the front speed of the bicycle and the interference of the money, and the key strip is The axis of the smallest diameter dragon and the smallest remaining sprocket are smooth. [Prior Art] According to Taiwan, Taiwan is the world's largest bicycle manufacturing country. Taiwan's high-quality bicycles are praised by the world. On the day of the week, the Chinese people began to pay attention to leisure activities. The government and private organizations promote bicycle activities, so bicycle lions In the _ _ domain tide, the self-forest is only for transportation, and it is a kind of competition activity. Therefore, the requirements on the shifting function are more important. How to accurately and stabilize the speed of work 9, the noise-free shifting effect, Compared with the pursuit of the industry, the bicycles with various ergonomic and improved shifting functions have also been asked. For an improved structure of the conventional front derailleur, see U.S. Patent No. 7,8, Working, No. 5, 8, discloses a bicycle front derailleur' comprising: a base member formed to be connectable to a bicycle frame; - a movable member a front end portion, a rear end portion formed to be movable between the -first position and the second position, and a - link member comprising a pivotally connected to the base a first connecting portion of the seat member, and a winding-to-rotation axis pivotally coupled to the second connecting portion of the movable member, the first link member having - a most forward surface and - most a rearward surface, the most forward surface and the most rearward surface extending along the first and second connecting portions of the first link member; a second link member including a rotatably coupled to the base member The 200916369 first connecting box' and a second pivoting axis are rotatably coupled to a second connecting portion of the movable member; and - the age of the first is set in the first - pivotal red, spider normal The movable constitutive object is hidden from the base piece to position the scale-position; when the light speed device is When mounted on the bicycle frame, the biasing member is at least partially located at the most forward direction of the first link member extending along the first connecting portion of the first link member The region (4) of the surface, the first connecting portion of the second link member includes an axially-closed mounting member that is rotatably coupled to the axial end portion of the lyotropic element. The conventional structure provides the function of bicycle shifting, increases the rigidity of the structure, reduces the stress of each component, and (4) 'but when the chain is driven by the smaller sprocket and the smaller diameter sprocket, the chain is skewed. There is a serious interference between the chain and the front derailleur, which not only causes the noise of the sun _, but also the wear of the chain between the stalk and the front (four). Unstable and destructive. In addition, when the chain is stepped on, the chain is applied strong, and when the shift is applied, the position of the chain is forcibly changed, so that the reading speed is subjected to extremely high stress, and how to strengthen the structural rigidity is also an object of improvement of the jump structure. Therefore, in view of the problems existing in the structure of the conventional front derailleur, how to develop a touch structure with better rigidity and better structure and better limbs, is expected to be eagerly awaited, and related industries must strive to develop breakthroughs. The aim and direction; In view of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years, and after the detailed design and complication of the above-mentioned objectives, the invention has finally arrived. SUMMARY OF THE INVENTION The present invention is directed to an improved structure of a front derailleur that can improve the rigidity of the conventional front derailleur structure and cause disadvantages such as noise, structural wear, and unsmooth shifting. In order to achieve the foregoing object, the present invention mainly includes a base, a first link, a second link, and a chain guide unit, wherein: the first link-end end is dragged to the base, and the other The end of the second link is pivotally connected to the base, and the other end is pivotally connected to the guide chain unit; the guide chain unit is provided with an outer guide chain > 1 and an i guide chain. The outer guide chain is connected with the inner guiding tabs at both ends to form an accommodating space for the chain to be worn, and the outer guiding chain is provided with a first end surface, a second end surface and a third end surface. The first end face is linear with the advancing direction and perpendicular to the horizontal plane, and the second end face is disposed at the front end of the outer guide chain, the second end face is parallel to the first end face and closer to the inner guide link than the first end face The third end face-end end is in contact with the second end face, and the other end of the third end face is inclined away from the inner guide link. By the second turning of the chain, the chain is made from the A to the smaller diameter to the smaller diameter of the toothed disc, and the cross-section of the first end surface and the second end surface is formed into a thin body to strengthen the overall rigidity. Furthermore, when the chain is driven by the smaller diameter sprocket and the smaller diameter sprocket, the key bar is in a skewed state, and the third end face is parallel to the chain slanting amount to maintain the chain and the outer guide chain. The gap 'cause' avoids structural interference' so that noise can be reduced and the wear of the structure can be overcome. Therefore, the invention improves the lack of structure and function of the front derailleur, and is actually a kind of creation with solid secrets and aspects, which is worthy of promotion and publication. [Implementation] 200916369 The present invention There are some improvements to the structure of the front derailleur. Please refer to the section -_, the body 40 is fixed to the seat tube! Below the Q, the body 4 is pierced - the chain 2 is placed in 1 to control the conversion of the chain 20 to the larger diameter sprocket 3 i 丨 or the smaller diameter slit 3 i 2, as shown in the second figure of the continuation, riding By multiplying, by stepping on the rotating toothed disc 3 i, the transmission is carried out via the chain 2 :: the key wheel 3 2 ' further drives the bicycle forward, and the toothed disc 31 drives the chain 2 〇 forward direction to the front', and vice versa, when the speed advances or In the case of a low speed button, the front derailleur and the rear derailleur (not shown) can be used to position the entire chain 2 at the position of the sprocket 3 i or the sprocket 3 2 , the larger diameter sprocket 311 or the smaller diameter sprocket 3 i 2 is matched with a larger diameter sprocket 3 2 丄 or a smaller diameter sprocket 3 2 2 to achieve a high speed or labor saving county, when the chain 2 〇 is located on the smaller diameter sprocket 312 and the smaller diameter sprocket When the state of 3 2 2 is actuated, the chain 2 〇 presents a state of slanting state, and the straight line state is mixed. The structure of the system cannot overcome the problem of noise caused by this state, and is also the focus of the invention. For the improved structure of the transmission of the present invention, please refer to the third and fourth figures, the body 4 includes a base 4 1 , a - link 4 2 - a second link 4 3 and a guide The chain unit 4 4, wherein: the base 41 is configured to fix the body 4 below the seat tube 1〇; the first link 42-end is pivotally connected to the base 41, and the other end is pivotally connected to the chain guide unit. 4 4; the second link 43-end is pivotally connected to the base 41, and the other end is pivotally connected to the chain guide unit 4 4; the guide chain unit 4 4 is provided with an outer guide link 4 41 and an inner guide chain The outer guide chain 4 41 is connected to the inner guide chain 4 4 2 to form an accommodating space 45 for the chain 20 to pass through, and the outer guide link 4 41 is provided. There is a first end face 4 410, a second end face 4 200916369 411, a third end face 4 412 and a fourth end face 4 413. When the chain 2 〇 is in a straight line, the first end face 4 410 is parallel to the chain 20 0. The second end surface 44 i μ is disposed at the front end of the outer guide chain 441 , and the second end surface 4 411 is parallel to the first end surface 44 and closer to the inner guide link 4 4 2 than the first end surface 44 1 . Third end face 4 412-end end and second end face 4 411 The other end of the third end face 4 412 is inclined away from the inner guide link 4 4 2 , the fourth end face 4 413 is in contact with the third end face 4 412 , and the other end is directed toward the inner guide link 4 4 2 When the direction is inclined, the outer guide chain 4 4 1 is made of is alloy or carbon fiber material to increase the overall strength, and further, the second end surface 4 411 is recessed with respect to the first end surface 41. The three-dimensional structure can further enhance the rigidity of the whole; the four-cup mechanism is formed by the base 41, the first link 42, the second link 43, and the chain guide unit 44. The guide chain unit 4 4 can be appropriately displaced. The change, when the shift is down, the first face 41 of the outer guide link 4 41 contacts the chain 2 〇 and pushes it, generally the chain 2 〇, , ·, A knife left and right, and the chain 20 is the outer chain The combination of the plate and the inner chain plate, at a distance of 3 times, ensures that the second end face 41 is in contact with the outer link plate, so the length of the second end face 4 41 is 丄 cm to 3 cm. 4 4 work 2 at the same time guiding the positive chain 2 〇 inward direction, the key bar 2 〇 smoothly converted to the smaller diameter toothed disk 311 to the smaller diameter toothed disk 312, when When the chain 20 is in the state of the minimum straight control toothed disc 312 and the smallest diameter sprocket 3 2 3, the chain 2 〇 is in the shape of a maximum positive slope, and the 4' the third end face 4 4 1 2 is the maximum skew angle with the chain 2 G Parallel, so as to keep the gap from interfering and avoid the problem of structural wear, but the third end face 441 2 is not unlimited extension 'the length that must be maintained, preferably 2 cm to 5 cm to avoid the outer guide chain #4 4 1 There is a danger of collision with the butterfly or touch. The above description is only for the preferred embodiment of the present invention, and is not intended to impose any form of limitation on the present invention 9 200916369, so that the invention is made under the same & Any modification and more 'should still be included in the mouth of this hair. In summary, the improved structure of the front derailleur of the present invention is indeed a developmental job in the industrial design of the structural design, and the structural invention that is heard is also unprecedented [new construction]. Therefore, it should be considered "clear", and the invention can be compared with, and. The structure is more effective. It is also "progressive". It is in full compliance with the requirements of the patent law for the invention patents. It is a legal patent, and please ask the fishing bureau to review it early and give it affirmation. . 200916369 [Simple description of the drawings] The first figure is a schematic front view of the improved structure of the front derailleur of the present invention. The second figure is a schematic diagram of the relative relationship between the front derailleur, the chain, the chainring and the sprocket. The third figure is a perspective view of an improved structure of the front derailleur of the present invention. The fourth figure is a schematic cross-sectional view of the third line segment AB. [Main component symbol description] 10-seat tube 3 1- ——ring plate 3 12- ——small diameter sprocket 3 2 1- larger diameter sprocket 3 2 3- ——minimum diameter sprocket 4 1- base Seat 43---Second link 44 1- ——External guide link 44 10 —— Brother one knows face 44 12 —— - Third end face 4 5-- ——Accommodation space 2 0- Chain 3 11- ——larger diameter sprocket 3 2- sprocket 3 2 2- smaller diameter sprocket 40- —— body 4 2- ——first link /1 Λ 33 33⁄4 early 442- inner guide chain 44 11 —— - second end face 44 13 —— - fourth end face 11