M274314 八、新型說明： 【新型所屬之技術領域】 本創作係有關於—種變 指一種既省六裡夂速自仃車之傳動結構，尤其是 種既’力、不易脫鏈 可加裝蓋體，而使騎驗^ \抑又了順利變速 ή > 孓者衣褲不致遭捲入夾住或沾污的一 種變速自仃車之傳動結構創新設計。 【先前技術】 按，就目前習知的自广$ 他尤 +圄所-u 仃車之傳動結構，請參閱第九〜 ⑽、傳動鍵條成後變速鍵輪組 係、可由聊踏板⑽)及曲變柄速(==前鍵輪⑻ ⑽二=變：二帶換， 前、後鍵輪⑽、⑽）之齒輪比，而達到= 文變所對應 然而，上述的習用結構於實際實施使、之效果。 之缺點急待改善·· Ψ ’卻有如下 1·上述習用之變速自行車之傳動結構，由 統在組裝上之便利性，該傳動系統大多呈加傳動系 或僅於上部之傳動鏈條上方加設一鏈條蓋吊敌式的設計 傳動系統由於其上方無任何遮擋之設計，因而開敌式的 騎乘者之衣褲遭轉動及運行中之前鏈輪與 吊發生 住或破損之情形，更容易發生沾污衣褲之狀、、鏈條失 騎乘者之困擾；而具鏈條蓋之傳動系統雖上=而造成 條上方有遮撞之設計，而可避免衣裤遭捲 傳動鍵 之情 5 M274314 形，但仍無法避免騎乘者之衣褲遭前鏈輪與傳動鏈條之 潤滑油沾污之狀況。 2·上述習用之變速自行車之傳動結構，由於係由單一傳動 鏈條繞設於前鏈輪、後變速鏈輪組及變速器間，當前、 後鏈輪之齒輪齒數趨近或小於前鏈輪之齒輪齒數時，將 造成騎乘者踩踏時更加的費力。 3·上述習用之變速自行車之傳動結構，當使用一段時間之 後’繞設於前鏈輪、後變速鏈輪組及變速器間之傳動鏈 _ 條’將產生鬆弛的現象，然而由於前鏈輪及後變速鏈輪 組均固定在車體上，所以無法調整其間的距離，致使傳 動鏈條因鬆他而容易脫落。 緣是，創作人有鑑於此，秉持多年該相關行業之豐富 設計開發及實際製作經驗，針對習用之結構及缺失予以研 究改良，提供既省力、不易脫鏈、方便自己維修、又可順 利變速可加裝蓋體，而使騎乘者衣褲不致遭捲入夾住或沾 污的一種變速自行車之傳動結構，以期完全改善習用的缺 » ^ ° 【新型内容】 本創作係有關於一種變速自行車之傳動結構，主要係 在前鏈輪與後變速鏈輪組之間的車體上固設導鏈滾輪，並 於導鏈滾輪上組設可偏移差速鏈輪組，分別利用前傳動鏈 條繞設於前鏈輪與可偏移差速鏈輪組之間，及利用後傳動 鏈條繞設可偏移差速鏈輪組、後變速鏈輪組及變速器之 間’而藉由撥動變速器帶動後傳動鏈條於後變速鏈輪組的 各鏈輪上變換移動，以改變所對應前、後鏈輪之齒輪比， 而達到變速之效果，並配合於車體上對應前鏈輪與可偏移 6 M274314 差速鏈輪組外側組設一蓋體而成；藉此，俾達既嗜力、不 易脫鏈、方便自己維修、又可順利變速之效果。 【實施方式】 而為令本創作之技術内容、創作目的及其所能達成之 功效能更完整、清楚的揭露，茲請一併參閱所揭之圖式及 圖號並詳細說明如下： 首先，請參閱第一〜四圖所示，本創作之變速自行車 之傳動結構，主要係在前鏈輪（1)與後變速鏈輪組（2)之間 的車體（3)上固設導鏈滾輪（4)，並於導鏈滾輪（4)上組設 可偏移差速鏈輪組（5)，並配合於車體（3)上對應前鏈輪（1) 與可偏移差速鏈輪組（5)外側組設一蓋體（6)而成，其中： 該前鏈輪（1)，樞設在車體（3)上，並穿設有腳踏板 (11)，藉由前傳動鏈條（12)與可偏移差速鏈輪組（5)的外 齒輪（51)繞設嚙合； 該後變速鏈輪組（2)，樞設在車體（3)之後端，具數個 不同大小、齒數之鏈輪（21)，藉由後傳動鏈條（22)與可偏 移差速鏈輪組（5)的内齒輪（52)及變速器（36)繞設嚙合； 該車體（3)，前端供組設前輪（31)及把手（32)，中間 設有坐墊（33)、前鏈輪（1)及腳踏板（11)，前鏈輪（1)旁側 後方設前組設端（34)，前組設端（34)具設數長溝槽 (341)，而車體（3)後端供組設後輪（35)、帶動後輪（35)的 後變速鏈輪組（2)、及變速器（36)，於後變速鏈輪組（2)前 方設後組設端（37)，後組設端（37) —侧具設長溝槽 (371) ，並於後組設端（37)長溝槽（371)後方向内凸設凸部 (372) ，該凸部（372)上設穿孔（373)，而該變速器（36)具 彈性結構以將後傳動鏈條（22)隨時伸張拉緊，而藉由撥動 M274314 變速器（36)帶動後傳動鏈條（22)於後變速鏈輪組（2)的各 鏈輪（21)上變換移動，以改變所對應前、後鏈輪〇)、（21) 之齒輪比’而達到變速之效果； 該導鏈滾輪（4)，其前側具設諸多螺孔（41)，供利用 螺固元件（42)穿設車體（3)前組設端（34)對應具設之長溝 槽（341)而固設在車體（3)上，其後側亦具設螺孔(43)，供 利用螺固元件（44)穿設車體（3)後組設端（37)—側對應具 設之長溝槽（371)而固設在車體（3)上，另，導鏈滾輪 後端向内彎折成形一彎折部（45)，該彎折部（45)上具螺孔 (46)，供利用螺固元件（47)穿設車體（3)後組設端（37)凸 部（372)上對應具設之穿孔（372)而固設在車體（3)上，令 該導鏈滾輪（4)可藉由其螺孔（41)、（43)、（46)與車體（3) 對應之長溝槽（341)、（371)及穿孔（373)之間的滑移螺固 以作向後調整，使前傳動鏈條（12)在前鏈輪（1)與可偏移 差速鏈輪組（5)的外齒輪（51)之間更緊密的嚙合；另，於 導鏈滾輪（4)中段具設一樞轴（48)，對應樞軸（48)上方具 設一限位桿（49)，限位桿（49)上套設一套筒（491)，供繞 設在可偏移差速鏈輪組（5)之外、内齒輪（51)、上的 則、後傳動鏈條（12)、（22)若將跳脫時的抵擋碰觸，並對 應滾動使前、後傳動鏈條（12)、（22)不致脫落； 該可偏移差速鍵輪組（5 )，柩設於導鍵滾輪（4 )中段之 樞軸（48)上，係由外齒輪（51)及内齒輪（52)所組成；該外 齒輪（51)之輪轴以轴向向内延伸軸套（511)，軸套（511)之 一端具溝槽（512)並夾設一 C形扣（513)，且於軸套（511) 一側上具設轴向的凸部（514);該内齒輪（52)軸心具設套 筒（521)，套筒（521)内一侧對應外齒輪（51)之軸套（511) 8 M274314 的凸部（514)具設溝槽（522)，令内齒輪（52)的套筒（52i) 恰可套入外齒輪（51)向内延伸之轴套（511)上，並令内齒 輪（52)之套筒（521)的溝槽（522)恰可卡摯外齒輪（51)之 軸套（511)的凸部（514)，使内齒輪（52)跟著外齒輪（51)轉 動而連動，並於内齒輪（52)轉動的同時，内齒輪（52)可在 軸套（511)上，於外齒輪（51)與C形扣(513)之間做軸向位 置移動。 於實施使用時，請參閱第三 ……· 八國尸叮不 碎增牙設M274314 VIII. Description of the new type: [Technical field to which the new type belongs] This creation is related to—a variant refers to a transmission structure that saves six miles of high-speed self-driving cars, especially a force that is not easy to disengage and can be added with a cover Body, so that the riding test ^ \ has a smooth shift price > The rider's clothes and pants are not caught in the grip or stain of a transmission structure innovative design. [Prior technology] Press, for the transmission structure of the currently known Ziguang + Tayou + 圄 所 -u 仃 car, please refer to the ninth ~ ⑽, the transmission key bar becomes the rear shift key wheel system, and the chat pedal can be used) And the crankshaft speed (== the front key wheel ⑻ ⑽2 = change: the second belt change, the front and rear key wheels ⑽, 达到), and the gear ratio is reached. However, the above conventional structure is actually implemented Make the effect. The shortcomings need to be improved ... Ψ 'But there are the following 1. The transmission structure of the conventional variable-speed bicycle mentioned above is convenient for assembly. Most of the transmission systems are equipped with a drive train or just above the upper transmission chain. A chain cover suspends the enemy-type design. The transmission system is designed without any cover above it. Therefore, the opener-type rider's clothes are turned and the sprocket and the sprocket are caught or damaged before running, which is more likely to occur. Contaminated clothes, troubled by the rider on the chain; while the transmission system with the chain cover is up, the design of the top is covered, which can prevent the clothes from being rolled by the drive key. 5 M274314 , But still cannot avoid the situation that the rider's clothes and pants are contaminated by the lubricating oil of the front sprocket and transmission chain. 2. The transmission structure of the conventional variable speed bicycle mentioned above, because a single transmission chain is wound between the front sprocket, the rear speed sprocket set and the transmission, the number of gear teeth of the current and rear sprocket approaches or is smaller than that of the front sprocket. The number of teeth will cause the rider to exert more effort when stepping on the pedal. 3. The transmission structure of the conventional variable-speed bicycle described above. When used for a period of time, the 'winding chain' between the front sprocket, the rear transmission sprocket set and the transmission will cause slackness. However, the front sprocket and the The rear shifting sprocket sets are fixed on the vehicle body, so the distance between them cannot be adjusted, which causes the transmission chain to fall off easily due to looseness. The reason is that in view of this, the creators have maintained rich design and development and practical production experience in this related industry for many years, and researched and improved the structures and defects used in the past, providing labor-saving, not easy to take off the chain, convenient self-maintenance, and smooth speed change. A transmission structure of a variable-speed bicycle with a cover that prevents the rider ’s clothing from being caught or contaminated, in order to completely improve the shortcomings of conventional use »^ ° [New content] This creation is about a variable-speed bicycle The transmission structure is mainly a guide chain roller fixed on the vehicle body between the front sprocket and the rear shifting sprocket group, and an offset differential sprocket group is set on the guide chain roller, and the front transmission chain is used respectively. Winding between the front sprocket and the shiftable differential sprocket set, and using the rear drive chain to wind between the shiftable differential sprocket set, the rear shifting sprocket set, and the transmission. Drive the rear transmission chain to change the movement on each sprocket of the rear shifting sprocket set to change the gear ratio of the corresponding front and rear sprocket to achieve the effect of shifting, and cooperate with the corresponding front sprocket on the vehicle body. Shift 6 M274314 A cover is formed on the outer side of the differential sprocket set; this way, Trent achieves the effect of being addicted, not easy to take off the chain, convenient for self-maintenance, and smooth shifting. [Implementation] In order to make the technical content, creative purpose and the effect that can be achieved of this creation more complete and clear, please refer to the drawings and numbers disclosed and explain in detail as follows: First, Please refer to the first to fourth figures, the transmission structure of the speed-changing bicycle of this creation is mainly a guide chain fixed on the car body (3) between the front sprocket (1) and the rear speed-changing sprocket set (2). Roller (4), and an offset differential sprocket set (5) is set on the guide chain roller (4), and is matched with the front sprocket (1) and offset differential on the body (3) A cover body (6) is set on the outer side of the sprocket set (5), wherein: the front sprocket (1) is pivotally arranged on the vehicle body (3), and is provided with a pedal (11), and The front transmission chain (12) meshes with the external gear (51) of the offset differential sprocket set (5); the rear transmission sprocket set (2) is pivotally arranged at the rear end of the car body (3), There are several sprocket wheels (21) of different sizes and number of teeth. The rear transmission chain (22) meshes with the internal gear (52) of the differential sprocket set (5) and the transmission (36). Body (3), front end for assembly The wheel (31) and the handle (32) are provided with a cushion (33), a front sprocket (1), and a foot pedal (11) in the middle, and a front assembly end (34) is provided on the side and rear of the front sprocket (1). The front set end (34) is provided with a number of long grooves (341), while the rear end of the car body (3) is provided with rear wheels (35), a rear shifting sprocket set (2) that drives the rear wheels (35), and The transmission (36) is provided with a rear set end (37) in front of the rear speed sprocket set (2), a rear set end (37)-a long groove (371) is provided on the side, and a rear end (37) is set A convex portion (372) is protruded in the rear direction of the long groove (371). The convex portion (372) is provided with a perforation (373), and the transmission (36) has an elastic structure to stretch and tighten the rear transmission chain (22) at any time. By turning the M274314 transmission (36), the rear transmission chain (22) is shifted on each sprocket (21) of the rear transmission sprocket set (2) to change the corresponding front and rear sprockets 0), (21) gear ratio 'to achieve the effect of speed change; the guide roller (4), the front side is provided with a number of screw holes (41) for screwing components (42) through the car body (3) front assembly The end (34) is fixed to the vehicle body (3) corresponding to the provided long groove (341) The rear side is also provided with a screw hole (43) for screwing the element (44) through the car body (3) to form the rear end (37)-the side is fixed to the long groove (371) provided. On the vehicle body (3), the rear end of the guide roller is bent inward to form a bent portion (45). The bent portion (45) is provided with a screw hole (46) for the use of a screwing element (47). ) After the car body (3) is worn, the convex end (372) of the assembly end (37) is fixed to the car body (3) corresponding to the perforation (372) provided, so that the guide roller (4) can be borrowed The sliding screws between the long grooves (341), (371) and the perforations (373) corresponding to the screw holes (41), (43), (46) and the body (3) are adjusted backwards so that The front transmission chain (12) is more closely meshed between the front sprocket (1) and the external gear (51) of the offset differential sprocket set (5); in addition, it is provided in the middle section of the guide chain roller (4) A pivot shaft (48), corresponding to the pivot shaft (48) is provided with a limit rod (49), a sleeve (491) is sleeved on the limit rod (49) for winding around an offset differential chain Outside the wheel set (5), the internal gear (51), the upper one, the rear drive chain (12), (22) Should be rolled so that the front and rear transmission chains (12), (22) will not fall off; the offset differential key wheel set (5) is set on the pivot (48) in the middle section of the key roller (4), It consists of an external gear (51) and an internal gear (52); the axle of the external gear (51) extends axially inwardly of the sleeve (511), and one end of the sleeve (511) is grooved (512) and A C-shaped buckle (513) is clamped, and an axial protrusion (514) is provided on one side of the sleeve (511); the shaft of the internal gear (52) is provided with a sleeve (521), and the sleeve ( 521) The sleeve (511) on the inner side corresponding to the external gear (51) 8 The projection (514) of M274314 is provided with a groove (522), so that the sleeve (52i) of the internal gear (52) can be put into the outside The shaft sleeve (511) of the gear (51) is extended inward, and the groove (522) of the sleeve (521) of the internal gear (52) can just fit the shaft sleeve (511) of the external gear (51). The convex part (514) causes the internal gear (52) to follow the rotation of the external gear (51), and at the same time as the internal gear (52) rotates, the internal gear (52) can be on the sleeve (511) and the external gear (51) moves axially with the C-shaped buckle (513). In the implementation, please refer to the third ...
在前鏈輪（1)的腳踏板（11)，則將由前鏈輪（1)經前鏈條 (12)帶動可偏移差速鏈輪（5)組外齒輪（51)，並連動可偏 移差速鏈輪組（5)内齒輪（52)經後鏈條（22)帶動後鏈輪 (21)以傳動後輪（35)轉動；當藉由撥動變速器（36)帶動後 傳動鏈條（22)於後變速鏈輪組（2)的各鏈輪（21)上變換移 動，以改變所對應前、後鏈輪⑴、⑵）之齒輪比，而達 到變速之效果，同時，當後傳動鏈條（22)於後變速鍵輪组 的各鏈輪⑻上變換移動時，由於後傳_條（22)於 ，變速鏈輪組⑵的鏈輪⑻上與可偏移差速鏈輪組⑸ 3齒輪⑽上將維持在同—直線上運轉，所以將拉移使 :速鏈輪組⑸上内齒輪(51)在外齒輪⑼向内延 速之又ίη做軸向位置移動，使變速更順利而快 ^，又由於在於導贿輪⑷中段對應樞轴⑽上方且設 f卜限位桿⑽，供限制繞設在可偏移差速鏈輪组⑸上 外、内齒輪⑻、⑽上之前 = 不致脫落，增加使用時的順利性。崎⑴）⑽使 請參閱第七圖所示，而力你m 動鏈條⑽齡時，可以親—段時間之後’當前傳 税目直接利用螺固工具調整導鏈 9 M274314 滾輪（4)，藉由其螺孔（41)、（43)、（46)與車體（3)對應之 長溝槽（341)、（371)及穿孔（373)之間的滑移螺固以作 後調整其螺孔（41)與車體（3)對應之長溝槽（371)之間的 滑移以作往後移位，使前傳動鏈條（12)在前鏈輪（1)與可 偏移差速鏈輪組（5)的外齒輪（51)之間更緊密的嚙合了而 不必還要送到自行車店·作維修；復，請參閲第八圖所示， 於車體（3)上對應前鏈輪d)與可偏移差速鏈輪組（5)外On the pedal (11) of the front sprocket (1), the front sprocket (1) drives the shiftable differential sprocket (5) group of external gears (51) through the front chain (12), The internal gear (52) of the offset differential sprocket set (5) drives the rear sprocket (21) to rotate the rear wheel (35) via the rear chain (22); when the rear transmission chain is driven by the transmission (36) (22) Shifting movements on each sprocket (21) of the rear shifting sprocket set (2) to change the gear ratios of the corresponding front and rear sprocket wheels (⑴, ⑵) to achieve the effect of shifting, and at the same time, when When the transmission chain (22) shifts and moves on each sprocket ⑻ of the rear shift key group, since the rear transmission _ (22) is on the sprocket ⑻ of the shift sprocket group ⑵ and the shiftable differential sprocket group ⑸ 3 gears 维持 will keep running in the same straight line, so the pull will move: the internal gear (51) on the speed sprocket set 在 is extended inward in the external gear ⑼ to make the axial position, so that the speed change is more Smooth and fast ^, and because the middle part of the guide wheel ⑷ is above the corresponding pivot ⑽ and the f limit lever 设 is provided for restricting winding around the upper and outer shiftable differential sprocket sets 内, the internal gears ⑻, ⑽ prior to = Does not fall off and increases smoothness during use. (Rugged) Please refer to the seventh picture, and when you are moving the chain, you can kiss-after a period of time, the current tax item directly adjusts the guide chain with screw tools. M274314 Roller (4), The screw holes (41), (43), (46) and the long grooves (341), (371) and perforations (373) corresponding to the car body (3) are slidingly screwed to adjust their screw holes (41) Sliding between the long grooves (371) corresponding to the vehicle body (3) for backward displacement, so that the front transmission chain (12) is positioned between the front sprocket (1) and the offset differential sprocket The outer gears (51) of the group (5) are more closely meshed without having to be sent to a bicycle shop for repairs; please refer to Figure 8 for the corresponding front chain on the body (3) Wheel d) and the offset differential sprocket set (5) outside
=设有蓋體（6),使騎乘者之衣褲不致遭轉動及運行中之 前鏈輪（1)與前、後傳動鏈條（12)、（22)捲入夾住，更 避免遭前鏈輪（1)與前、後傳動鏈條（12)、（22)之 沾污之狀況。 ’泊 作具二點本創作之結構組成及實施說明可知’本創 1. 土於本創作具*二段摘祕轉，她 前鏈條帶動可偏移差速鏈輪組較小的外齒輪，並= 内齒輪經後鏈條帶動後鏈輪，所以踩踏騎 在使用一段時間之後，當前鏈條鬆弛時，可 、自直接利用螺固工具調整導鏈 車體對應之長溝槽之間的滑移以作往後移 ^喃合，而不必還要送到自行車店作；;輪之間更緊 •於本創作於導鏈滾輪中段對應樞 =;=在可偏移差繼組上外心= “於本用時的_性。 任错由撥動變速裔換擋時’將帶動後傳動鍵 10 M274314 條於後變速鏈輪組的各鏈輪上變換移動，而可偏移差速 鏈輪組上内齒輪同時可在外齒輪向内延伸之軸套上做 軸向位置移動，使變速更順利而快速。 5.由於本創作在於車體上對應前鏈輪與可偏移差速鏈輪 組外側組設有蓋體，使騎乘者之衣褲不致遭轉動及運行 中<前鏈輪與傳動鏈條捲入炎住，更可避免遭前鏈輪與 傳動鏈條之潤滑油沾污之狀況。 綜上所述，本創作實施例確能達到所預期之使用功 效，又其所提露之具體構造，不僅未曾見諸於同類產品 中，亦未曾公開於申請前，誠已完全符合專利法之規定與 要求，爰依法提出新型專利之申請，懇請惠予審查，並賜 准專利，則實感德便。 【圖式簡單說明】 第一圖：本創作之整體外觀圖 M274314 第二圖：本創作之局部放大侧視圖 第三圖：本創作之上視剖面圖 (可偏移差速鏈輪組的内齒輪外移） 第四圖：本創作之上視剖面圖 (可偏移差速鏈輪組的内齒輪内移） 第五圖：本創作之上視剖面放大圖 (可偏移差速鏈輪組的内齒輪外移） 第六圖：本創作之上視剖面放大圖 (可偏移差速鏈輪組的内齒輪内移） 第七圖··本創作之上視剖面圖（導鏈滾輪往後調整） 第八圖：本創作之側視圖（蓋設有蓋體時） 第九圖：習用之整體外觀圖 第十圖：習用之局部放大側視圖 【主要元件符號說明】 <本創作> (1) 前鏈輪 (11) 腳踏板 (12) 前傳動鏈條 (2) 後變速鏈輪組 (21) 鏈輪 (22) 後傳動鏈條 (3) 車體 (31) 前輪 (32) 把手 (33) 坐塾 (34) 前組設端 (341) 長溝槽 (35) 後輪 (36) 變速器 (37) 後組設端 (371) 長溝槽 (372) 凸部 (373) 穿孔 (4) 導鏈滾輪 (41) 12 螺孔 M274314 (42) 螺固元件 (43) 螺孔 (44) 螺固元件 (45) 彎折部 (46) 螺孔 (47) 螺固元件 (48) 樞軸 (49) 限位桿 (491) 套筒 (5) 可偏移差速鏈輪組 (51) 外齒輪 (511) 軸套 (512) 溝槽 (513) C形扣 (514) 凸部 (52) 内齒輪 (521) 套筒 (522) 溝槽 (6) 蓋體 <習用 > (91) 前鏈輪 (911) 腳踏板 (912) 曲柄 (92) 後變速鏈輪組 (921) 後鍵輪 (93) 傳動鏈條 (94) 變速器 13= With cover (6), the rider's clothes will not be rotated and the front sprocket (1) and front and rear transmission chains (12), (22) will be caught and clamped during running, and the front chain will be avoided. Contamination of the wheel (1) and the front and rear transmission chains (12), (22). 'The structural composition and implementation instructions of the two-point creation of Bo Zuo Ji' can be found. 'Ben Chuang 1. The first paragraph of the local creation tool is a secret turn. Her front chain drives the smaller external gear of the offset differential sprocket set. And = The internal gear drives the rear sprocket through the rear chain, so after the pedal is used for a period of time, when the current chain is loose, the sliding between the long grooves corresponding to the chain guide car body can be adjusted directly by using the screwing tool. Move backwards ^ mumble together, without having to send it to the bike shop ;; Wheels are tighter. • This work is in the middle of the guide chain roller corresponding to the pivot =; = the outer center of the offset difference group = "于At the time of use. When you make a mistake, when you shift the gear, you will drive the rear transmission key 10 M274314 on each sprocket of the rear shift sprocket set, and you can shift the differential sprocket set. The internal gear can also move in the axial position on the inwardly extending sleeve of the external gear to make the shift more smooth and fast. 5. Because this creation is on the car body, it corresponds to the front sprocket and the shiftable differential sprocket outer group. Cover is provided to prevent the rider's clothes from being turned and running <front sprocket and relay If the chain is caught in the flames, it can avoid the situation of being contaminated by the lubricating oil of the front sprocket and the transmission chain. In summary, this creative embodiment can indeed achieve the expected use effect, and the specific structure of it Not only has it not been found in similar products, nor has it been disclosed before the application. It has fully complied with the provisions and requirements of the Patent Law. It has applied for a new patent in accordance with the law, and it is hoped that it will be reviewed and granted a patent. [Schematic explanation] The first picture: the overall appearance of this creation M274314 The second picture: a partially enlarged side view of this creation The third picture: the top sectional view of this creation (the offset sprocket Internal gear moving outwards) Figure 4: Top view of this creation (internal gear of the differential sprocket can be shifted inwardly) Figure 5: Enlarged view of this creation (upper offset differential chain) The internal gear of the wheel set moves outwards. Figure 6: An enlarged view of the top view of this creation (internal gear of the differential sprocket can be shifted inward). Adjust the wheel backward) Figure 8: Side view of this creation When the cover is equipped with a cover) Figure 9: Conventional overall appearance diagram Tenth Figure: Conventional partial enlarged side view [Explanation of Symbols of Main Components] < This Creation > (1) Front Sprocket (11) Foot Pedal ( 12) Front transmission chain (2) Rear transmission sprocket set (21) Sprocket (22) Rear transmission chain (3) Car body (31) Front wheel (32) Handle (33) Seat (34) Front end set ( 341) Long groove (35) Rear wheel (36) Transmission (37) Rear set end (371) Long groove (372) Convex (373) Perforation (4) Chain guide roller (41) 12 Screw hole M274314 (42) Screw element (43) Screw hole (44) Screw element (45) Bend (46) Screw hole (47) Screw element (48) Pivot (49) Limit rod (491) Sleeve (5) Offset differential sprocket set (51) External gear (511) Bushing (512) Groove (513) C-shaped buckle (514) Convex (52) Internal gear (521) Sleeve (522) Groove ( 6) Cover < Conventional > (91) Front sprocket (911) Pedal plate (912) Crank (92) Rear shift sprocket set (921) Rear key wheel (93) Transmission chain (94) Transmission 13