200938431 九、發明說明： 【發明所屬之技術領域】 - 本發明係有關一種自行車鏈輪結構，特別係指一種輕量化且兼具結構強 . 度者，並利用多組式鏈輪以達到組裝容易、製造成本更低、替換方便且卡 固效果更佳之功效。 【先前技術】 按，台灣為世界最大自行車製造國家，台灣製造之高品質自行車更為 〇 世人所讚譽，由於週休二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，因此自行車運動在國内蔚為風潮，自行車不僅僅為 交通工具，更是一種競賽活動，自行車競赛在速度及時間的嚴苛考驗下， 自行車之設計朝著輕量化及高強度之方向發展，但強度往往與重量成正 比’如何在高強度與輕量化之間取得平衡點，一直是自行車產業所待解決 之課題’在自行車運動及產業蓬勃發展之帶動下，各種符合人體工學之設 計、高強度結構及輕量化的自行車亦相繼問市。 Ο 習用自行車鏈輪結構’請參閱美國專利第7131656號『Sprocket support member for a bicycle sprocket assembly』’ 一種自行車鏈輪結構，其至 少包含一次組件，該次組件係包括一鏈輪支撐元件及兩鏈輪，該鏈輪支樓 元件係至少包含一嚙合部及一鎖固部，該嚙合部係用以與自行車飛輪偶 合’該鎖固部係由嚙合部徑向向外延伸，兩鏈輪係與鏈輪支撐元件固定於 鎖固部之相同側。 習用之自行車鍵輪需利用鏈輪支撐元件將鏈輪鎖固，再與自行車飛輪結 200938431 Q，或是單片式鏈輪一片一片的與自行車飛輪結合，結構複雜且構件繁多， 不僅僅製4成本商，且製造精度要求甚高，如此，製造成本更是雪上加霜， .也影響乡且裝之便利性及容易性；再者，習用結構並不能有效降低重量，無 •法達到輕量化之目標；此外，較大外徑之鏈輪於騎乘時，有利於力量傳導 及分佈較平均，如何提升其強度與替換便利性，也是習用結構無法克服的 難題》 疋以’針對上述習用自行車鍵輪結構所存在之問題點，如何開發一種結 ©構更簡單、更易於組裝，兼具輕量化及高強度之創新結構，實消費者所殷 切企盼’亦係相關業者須努力研發突破之目標及方向； 有锻於此，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，詳加設計與審慎評估後，終得一確具實用性之本發明。 【發明内容】 本發明主要係提供一種自行車鏈輪結構，其可改善習用自行車鏈輪構 件繁多、組裝不易’以及重量較重且強度不佳等缺點。 ® 為達成前述之發明目的，本發明其主要係包括一第_鏈輪組、一第二鍵 輪組及一第三鍵輪組，其中： 該第一鏈輪組係一體成形至少一鏈輪，該鏈輪係用以提供自行車鏈條套 設，該第一鏈輪組係設有一嚙合部及一凸部，該嚙合部係用以提供自行車 飛輪套設； 該第二鏈輪組係一體成形至少二外徑相異之鏈輪，該鍵輪係用以提供自 行車鏈條套設，該第二鍵輪組之鏈輪外徑均小於第一鏈輪組之最大鍵輪外 徑，該鏈輪外徑較大端係設有一第一凹部，該第一凹部係與第一鏈輪組之 200938431 200938431 凹部，該嚙合部 凸部相嚙合，該鏈輪外徑較小端係設有一嚙合部及一第 係用以提供自行車飛輪套設； 該第二鏈輪組係-體成形至少一鏈輪，該鏈輪係用以提供自行車鍵條套 .$ ’該最小鏈輪外徑係小於第二鏈輪組之任—鏈輪外徑，該第三鍵輪组係 设有一喃合部，該嘲合部係用以提供自行車飛輪套設，該第三鍵輪 有一凸緣，該凸緣係與第二鏈輪組之第二凹部相配合； ，… 〜藉由該第-凹部與凸部㈣合，達到第二鍵輪組與第一鍵輪組定位且組 © I办易之目的’且當第一鍵輪組之鏈輪受到較大扭力作用時，可有效將力 量分散至第二鏈輪組，以降低第一鍵輪組之受力分佈，使受力較為平均， 並由於第鏈輪組、第二鍵輪組及第三鏈輪組各為—體製成，結構強度相 較於習用單片式鏈輪更佳；再者，使用者為因應不同的縣需求，如平坦 路面需求較大齒數比、爬坡路面需求較小齒數比，因此需要替換較小外徑 之鏈輪或較大外徑之鍵輪，藉φ帛—鍵輪組設置較大外彳$之鍵輪^第三鍵 輪組設置較小外徑之鏈輪，依照需求直接替換第一鏈輪組或第三鍵輪組， ❽不必一片一片替換，可達到替換容易且組裝便利之功效； 此外’該第一鏈輪組設有複數個鏤空部且以鋁或鈦等輕金屬製成，與第 -鏈輪組内部為中空結構，更能有效達到輕量化之目標，並增加第一鏈輪 組之耐用度。 是故’本發明改善了自行車鏈輪結構及使用上的諸多缺失，實是一種 相當具有實用性及進步性之創作，相當值得產業界來推廣，並公諸於社會 大眾。 【實施方式】 200938431 本發明係«於-種自行車鏈輪結構，請參照第—Β至第六圖所示，其 主要係包括—第—鏈輪組1Q 一第二鏈輪組2〇及-第三鏈輪組3〇，其中、· 該第一鏈輪組10係—體成形至少一鏈輪11，本實施例為二外徑相異之 鏈輪1卜該鏈輪11係用以提供自行車鍵條套設，該第一鏈輪㈣中心係 設有一唾合部12 ’該私部12係為預定形狀之貫穿齒形m，用以提供自 饤車套設’該鍵輪u外徑較小端係設有—凸部13，該凸部料周係 為和形狀之齒形13卜本實施例中齒形131為雲形線亦可為多邊形該 Ο 〇 第一鏈輪組H)係環設有複數個鏤空部14，亦可⑽或鈦等輕金屬製成，二 達成輕量之目的； 該第-鍵輪組㈣_體成職少二外麵私雖21，本實施例中為 ^輪21 ’該鏈輪21係用以提供自行車鏈條套^，該第二鏈輪組如 1气外徑均小於第—鏈輪組1G之最大鏈輪n外徑，該鏈輪21外獲最大 =叹有1 —凹部22 ’該第一凹部22係凹設有一與第—鏈輪組1〇之凸 三3齒形131相對應之齒形221，用以互相响合，該鍵輪21外控最 合部23及_第二凹部24 ’該嗔合部烈係為預定形狀之齒形如，' 二=自行車飛輪套設’該第二凹部24係為圓弧狀，該第 内顿可呈中空狀，以減輕重量； 2〇 鏈輪亥鍵輪組3〇係一體成形至少一鍵輪31 ’本實施例為二外後相異之 該鏈輪31係用以提供自行車鏈條套設，該最小鏈輪31 q〇 、20之任—鏈輪21外徑，該第三鏈輪組30中心係設有—喻 鏈輪31 〇 °卩32係為預定形狀之齒形321，用以提供自行車飛輪套彀，診 係設有"凸緣33 ’該凸緣33係娜狀，且與第4 第一凹部24相配合組設； 8 200938431 本發明藉由第一凹部22與凸部13相嚙合，以及第二凹部24與凸緣沿 相配合組設，達到第一鏈輪組1〇、第二鏈輪組2〇及第三鏈輪組卯三組式 ，鏈輪定位容易且《便利之目的’當如需要替換時，可分_換，當平: .路面需求較大齒數比時，直接替換較小外徑之第三鏈輪組，當肢坡路面需 求較小齒數比，直接替換較大外徑之第一鏈輪鏈輪，更增添替換之方便性， 並且當第-鏈輪組10之鏈輪n受到較大扭力作用時，藉由凸部^可有效 將力量分散至第二鍵輪組20，以降低第一鏈輪組1〇之受力分佈，使受力較 ❹為平均，並由於第一鏈輪組10、第二鏈輪組2〇及第三鍵輪組各為—體 製成，結構強度相較於習用單片式鏈輪更佳； 此外’第-鏈輪組10設有複數個鏤空部14且以銘或鈦_金屬製成， 與第二鏈輪組2G内部為中空結構’更能有效達到輕量化之目標，並增加第 —鏈輪組10之耐用度。 本發明之另-實施例，請參閱第七圖及第八圖所示，其中與第一實施例 相同者，恕不再贅述，其中該第二鍵輪組20内部為中空且呈錐度，更能有 ❹效降低重量’另外，特別一提，第二鍵輪組20之唾合部23僅需設於鍵輪 …卜徑最小端’並不需要完全設置，藉由第一凹部烈與凸部μ之喷合， 即可有效傳動，如此更能節省加工工序及加工成本。 由上所述者僅為用以解釋本發明之較佳實施例，並非企圖據以對本發明 做任何形式上之限制，是以凸部與第—凹部或凸緣與第二凹部之間凹部、 凸部位置互換或形狀改變，凡有在相同之發明精神下所做有關本發明之任 何修飾或敎者，健包括林發《聽護之範疇内。 …綜上_’本發明之自行車結構在賴設計、朗實雜及成本 效益上’確實是完全符合產業上發展所需’且所揭露之結構發明亦是具有 9 200938431 前所林_構造，所喊具有「_性」應_，又本發明可較習 知結構更具功效之增進，因此亦具有「進步性」，其完全符合我國專利法有 .關發明專利之申請要件的規定，乃依法提起專利申請，並敬請釣局早曰 . 審查，並給予肯定。 【圖式簡單說明】 第-圖係本發明自行車鏈輪結構立體分解示意圖。 第-A圖係本發明之第二鏈輪組另一角度立體示意圖。 0 第二圖係本發明之第二鍵輪組正面示意圖。 第三圖係本發明之第三鏈輪組背面示意圖。 第四圖係本發明之第一鍵輪組正面示意圖。 第五圖係本發明之第二鏈輪組背面示意圖。 第六圖係本發明自行車鏈輪結構剖面示意圖。 第七圖係本發H實施例之第二鏈輪组立體示意圖。 第八圖係本發明之另一實施例剖面示意圖。 Q 【主要元件符號說明】 10第一鏈輪組 11鏈輪 12响合部 121齒形 13凸部 131齒形 14鏤空部 20第二鍵輪組 21鍵輪 22第一凹部 221齒形 23嚙合部 231齒形 24第二凹部 30第三鍵輪組 31鍵輪 32唾合部 321齒形 33凸緣 10200938431 IX. Description of the invention: [Technical field to which the invention pertains] - The present invention relates to a bicycle sprocket structure, particularly to a lightweight and structurally strong one, and utilizes a multi-group sprocket to achieve easy assembly. , lower manufacturing cost, easy replacement and better carding effect. [Previous technology] According to Taiwan, Taiwan is the world's largest bicycle manufacturing country. The high-quality bicycles made in Taiwan are more praised by the world. Because the Chinese people began to pay attention to leisure activities on the 2nd week of the week, the government and non-government organizations promote bicycle activities, so bicycles are The domestic trend is that the bicycle is not only a means of transportation, but also a kind of competition. Under the rigorous test of speed and time, the bicycle design is developing in the direction of light weight and high strength, but the intensity is often The weight is proportional to 'how to balance the high strength and light weight, has been the subject of the bicycle industry to be solved', driven by the cycling and industrial development, ergonomic design, high-strength structure and Lightweight bicycles have also been asked about the market.习 A conventional bicycle sprocket structure is described in the following section: "Sprocket support member for a bicycle sprocket assembly". A bicycle sprocket structure comprising at least a primary assembly comprising a sprocket support member and two links The sprocket fulcrum member includes at least one engaging portion and a locking portion for coupling with the bicycle flywheel. The locking portion is radially outwardly extended by the engaging portion, and the two sprocket systems are coupled to each other. The sprocket support members are fixed to the same side of the lock. The conventional bicycle key wheel needs to use the sprocket support component to lock the sprocket, and then the bicycle flywheel knot 200938431 Q, or the monolithic sprocket is combined with the bicycle flywheel. The structure is complicated and the components are numerous, not only 4 Cost quotient, and manufacturing precision requirements are very high, so the manufacturing cost is even worse, and it also affects the convenience and easiness of the township; in addition, the conventional structure can not effectively reduce the weight, and the method of achieving the goal of weight reduction In addition, when the sprocket with a larger outer diameter is used for riding, it is advantageous for the power transmission and distribution to be average, how to improve its strength and replacement convenience, and it is also a problem that the conventional structure cannot overcome. The problem with the structure is how to develop an innovative structure that is simpler and easier to assemble, and that is both lightweight and high-strength. The consumers are eagerly awaiting the goal and direction of the relevant industry. In the case of this, the inventor has been engaged in the manufacturing development and design experience of related products for many years, and has designed and designed the above objectives. After careful evaluation, to obtain a final determined practicality of the present invention. SUMMARY OF THE INVENTION The present invention mainly provides a bicycle sprocket structure which can improve the disadvantages of the conventional bicycle sprocket structure, the assembly is difficult, and the weight is heavy and the strength is not good. In order to achieve the foregoing object, the present invention mainly includes a first sprocket set, a second key wheel set and a third key wheel set, wherein: the first sprocket set integrally forms at least one sprocket The sprocket is used for providing a bicycle chain sleeve. The first sprocket set is provided with an engaging portion and a convex portion for providing a bicycle flywheel sleeve; the second sprocket set is integrally formed a sprocket having at least two outer diameters, the key wheel is configured to provide a bicycle chain sleeve, wherein an outer diameter of the sprocket of the second key wheel set is smaller than an outer diameter of a maximum key wheel of the first sprocket set, the sprocket The first outer recess is provided with a first recessed portion, and the first recessed portion is engaged with the recessed portion of the first sprocket set 200938431 200938431, and the engaging portion has a convex portion, and the smaller outer diameter of the sprocket is provided with an engaging portion and a first system for providing a bicycle flywheel sleeve; the second sprocket assembly is for forming at least one sprocket for providing a bicycle key strip sleeve. The minimum sprocket outer diameter is smaller than the second The sprocket set is the sprocket outer diameter, and the third key wheel set is provided with a merging portion, The merging is for providing a bicycle flywheel sleeve, the third key wheel has a flange, and the flange is matched with the second concave portion of the second sprocket set; ... by the first concave portion and the convex portion (four) In combination, the second key wheel set and the first key wheel set are positioned and the group is used for the purpose of “I am easy to use”, and when the sprocket of the first key wheel set is subjected to a large torque, the force can be effectively dispersed to the second chain. The wheel set is used to reduce the force distribution of the first key wheel set, so that the force is relatively average, and since the first sprocket set, the second key wheel set and the third sprocket set are each made of body, the structural strength is compared In practice, the single-piece sprocket is better; in addition, the user needs to replace the smaller outer diameter sprocket in response to different county demands, such as a larger gear ratio for flat roads and a smaller gear ratio for climbing roads. Or a larger outer diameter key wheel, by φ帛-key wheel set to set a larger outer 彳 $ key wheel ^ third key wheel set to set a smaller outer diameter sprocket, directly replace the first sprocket set according to demand or The third key wheel set, ❽ does not have to be replaced one by one, which can achieve the effect of easy replacement and convenient assembly; A sprocket set is provided with a plurality of hollow portions and is made of light metal such as aluminum or titanium, and has a hollow structure inside the first sprocket set, which can effectively achieve the goal of weight reduction and increase the durability of the first sprocket set. . Therefore, the invention improves the structure and use of bicycle sprocket, and it is a practical and progressive creation, which is worthy of promotion by the industry and is publicized to the public. [Embodiment] 200938431 The present invention is a bicycle sprocket structure, please refer to the first to sixth figure, which mainly includes a - sprocket set 1Q - a second sprocket set 2 〇 and - a third sprocket set 3〇, wherein the first sprocket set 10 is formed by at least one sprocket 11 , and in this embodiment, two sprocket wheels 1 having different outer diameters are provided for providing The bicycle key strip is sleeved, and the center of the first sprocket (4) is provided with a salvage portion 12'. The private portion 12 is a through-tooth shape m of a predetermined shape for providing a self-boring vehicle sleeve 'the outer diameter of the key wheel u The smaller end is provided with a convex portion 13 having a tooth shape 13 of a shape and a shape. In this embodiment, the tooth shape 131 is a cloud line or a polygon. The first sprocket group H) The ring is provided with a plurality of hollow portions 14, which may also be made of light metal such as (10) or titanium, and the purpose of achieving lightweightness; the first-key wheel set (four) _ body is less than two outer private 21, in this embodiment The wheel 21 is used to provide a bicycle chain cover. The outer diameter of the second sprocket set is smaller than the outer diameter of the largest sprocket n of the first sprocket set 1G, and the sprocket 21 is externally obtained. most = sigh 1 - recess 22 ' The first recess 22 is recessed with a tooth 221 corresponding to the convex 3 3 tooth 131 of the first sprocket set 1 , for mutual sounding, outside the key wheel 21 The control fitting portion 23 and the second recess portion 24' are configured to have a predetermined shape of the tooth shape, such as, 'two = bicycle flywheel sleeve'. The second recess portion 24 is arcuate, and the inner portion can be It is hollow to reduce the weight; 2〇 sprocket kelp wheel set 3 一体 is integrally formed with at least one key wheel 31 ' This embodiment is two outer and rear different sprocket 31 is used to provide bicycle chain arranging, The minimum sprocket 31 q〇, 20 is the outer diameter of the sprocket 21, and the center of the third sprocket set 30 is provided with a sprocket 31 〇° 卩 32 which is a tooth shape 321 of a predetermined shape for providing The bicycle flywheel sleeve is provided with a flange 33' which is formed in a Na shape and is combined with the fourth first recess 24; 8 200938431 The present invention is provided by the first recess 22 and the convex portion 13 Engaging, and the second recess 24 is assembled with the flange to reach the first sprocket set 1〇, the second sprocket set 2〇 and the third sprocket set ,, the sprocket positioning Easy and "convenient purpose", if it needs to be replaced, it can be divided into _ change, when flat: When the road surface demand is larger than the gear ratio, directly replace the third sprocket group with smaller outer diameter, when the slope of the slope is less demanded The gear ratio directly replaces the first sprocket sprocket of the larger outer diameter, which further increases the convenience of replacement, and when the sprocket n of the first sprocket set 10 is subjected to a large torque, the convex portion can be effectively Dispersing the force to the second key wheel set 20 to reduce the force distribution of the first sprocket set 1 ,, so that the force is more average, and because the first sprocket set 10 and the second sprocket set 2 The third set of wheel sets are each made of body, and the structural strength is better than that of the conventional single-piece sprocket; in addition, the 'the sprocket set 10 is provided with a plurality of hollow portions 14 and made of metal or titanium metal. The hollow structure of the second sprocket set 2G is more effective in achieving the goal of weight reduction, and the durability of the first sprocket set 10 is increased. For the other embodiments of the present invention, please refer to the seventh embodiment and the eighth embodiment, wherein the same as the first embodiment will not be described again, wherein the second key wheel set 20 is hollow and tapered inside. It can be effective to reduce the weight. In addition, in particular, the salvage portion 23 of the second key wheel set 20 only needs to be disposed on the key wheel... the minimum end of the path diameter does not need to be completely set, by the first concave portion and the convex portion. The injection of the part μ can be effectively driven, which can save processing and processing costs. The above description is only a preferred embodiment for explaining the present invention, and is not intended to limit the present invention in any way, such as a convex portion and a first concave portion or a concave portion between the flange and the second concave portion, The position of the convex part is interchanged or the shape is changed. Any modification or defect relating to the present invention made in the spirit of the same invention includes Jianfa in the scope of the hearing. ...In summary _'The bicycle structure of the present invention is really in line with the development of the industry in terms of design, sturdiness and cost-effectiveness, and the disclosed structural invention also has the structure of 9 200938431. Shouting has "_sex" should be _, and the invention can be more effective than the conventional structure, and therefore has "progressiveness", which fully complies with the provisions of the application requirements of the patent law of the Chinese patent law. File a patent application and ask the fishing bureau to check it out early. Review and give affirmation. BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a perspective exploded view of the bicycle sprocket structure of the present invention. Figure-A is a perspective view of another angle of the second sprocket set of the present invention. 0 The second figure is a front view of the second key wheel set of the present invention. The third figure is a schematic view of the back side of the third sprocket set of the present invention. The fourth figure is a front view of the first key wheel set of the present invention. The fifth figure is a schematic view of the back of the second sprocket set of the present invention. The sixth figure is a schematic cross-sectional view of the bicycle sprocket structure of the present invention. The seventh figure is a perspective view of the second sprocket set of the embodiment of the present invention. Figure 8 is a schematic cross-sectional view showing another embodiment of the present invention. Q [Description of main component symbols] 10 first sprocket set 11 sprocket 12 splicing portion 121 toothed 13 convex portion 131 toothed shape 14 hollow portion 20 second key wheel set 21 key wheel 22 first concave portion 221 tooth shape 23 meshing Portion 231 tooth shape 24 second recess 30 third key wheel set 31 key wheel 32 salvage portion 321 tooth shape 33 flange 10