M342338 ★ • 八、新型說明·· 【新型所屬之技術領域】 本案係一種可安裝於具有齒盤裝置或飛輪裝置之輪車的空檔結構。所述的 •輪車包含但不限於兩輪車、三輪車、協力車、折疊車..等車輛。該空檔結構 可使齒盤裝置或飛輪裝置呈空；ff自由轉動狀態，使車輛被使用者轉或倒退時 腳踏及曲柄皆不隨之轉動。 【先前技術】 • 使用者牽移自行車時經常面臨的問題，就是自行車被往後牵移的過程中， 腳踏及曲柄會向後倒轉’腳踏容易碰撞外物，如果使用者站在自行車的侧邊， 被倒轉的曲柄腳踏碰傷足部的機率相當高。 • 折逢車也面臨上述的問題’若要將折疊好的自行車向後移動，倒轉的腳踏 、及曲婦必也會卡住車體，而使車聽法雜並造祕害。 中請人於先前曾提㈣折疊車搭配置物齡及㈣伸縮貨㈣方案，該方 案使收折的兩輪車可做為置物拖車使用，發職物移動的功能 ，現已申請專利 在案然、而’上述腳踏及曲柄倒轉的問題，限制了拖車移動的自主性，並造成 兩輪車在電制或其他無法使其迴轉的狹輕間裡要倒退時之困膊礙及對週 遭之傷害。 ^ 【新型内容】 本創作之主要目的係师簡單雜之結構原理解決兩輪車於向後移動時腳 踏及曲柄會向後倒轉的問題。 成上述目的之技術方案係於兩輪車其中之—齒盤組設空檔結構，該 構包括-自由齒盤以及_軸承，該自由齒盤之中 齒盤組之轉動組件，使兮π t 狐及 轉動組件與該自由齒盤呈相對雙向空轉之對應關係。 兩輪車之鏈條可以藉由傲、击抑_ τ 文逯早7L之控制而於齒盤組及自由齒盤上切換。變 5 M342338 兀设定-空倾位表示鏈條掛鏈於自由赖。該自由齒縣設有—安全褒置， 該女全裝置使自由齒盤與齒盤組構成連動關係。 本案功奴-係制者㈣兩輪車往後鶴時，曲柄及騎鱗不動，避 •免曲柄及腳踏碰撞外物或碰傷使用者足部，牵移兩輪車時將更為安全、方便。 本案功效之二係兩輪車被折疊並配合置物籃架而成為拖車使用時，因腳踏 與曲柄均保·位不動，所以拖車可以被向前或向後移動，增進拖車移動的自 主性。 Φ 本案功效之三係當兩輪車被騎用之前，使用者可先設定該安全裝置，使自 由w盤與齒盤組構成連動義，腳踏及曲柄即可帶麟自由餘，以確保兩輪 車正常運行及騎用安全性。 【實施方式】 - #第-圖’係以折疊兩輪車為例，說明本案空標結構_實施樣態外觀圖。 ••與本案空舰構有關的組件包括腳卿、曲柄21、前齒盤組3Q、後齒盤組4〇、 以及鏈條50。 第一一、四圖，本案空檔結構1〇實施於後齒盤組4〇之立體分解圖及剖 馨面圖後U!盤組4〇包括複數傳動齒盤41，傳動齒盤41之直徑及齒數具有階級變 化’各傳動鐘41曝心雜套於—躺組件42，該轉動鱗42樞套於一後輪 •硫43之端^。上述之傳動齒盤41、轉動組件42、後輪花較奶彼此之間具連動 關係。 本案之特徵係在_後齒盤組4〇巾設_空槽結構1()，該空檔結構彳⑽由一自 由HUx及-軸承12所構成，該自由齒盤μ之巾心藉由雜承彳]樞套於該轉 動、、且件42，雜承12使該轉動組件42與該自由齒盤μ為相對雙向空轉之對應關 係4工檔結構1〇可以加設於原來的後齒盤組4〇，亦可由該後齒盤組4〇中的任 傳動回盤41改设。本案實施例係以最小直徑的齒盤為自由會盤μ。圖式中編 6 M342338 號為51賴止το件係為了軸崎止及定健自由龍彳1及其他傳動缝μ而固 設於轉動組件42。 鏈獅可以藉由兩輪車魏單元之控_於各傳_細以及自由齒盤^ ^ •上切換。值得制的是，該變料元之齡城獅設定—雜齡表示鍵條 50掛鏈於自由龍1彳，鱗伽者轉躺輪車紐義，曲柄21及腳踏2〇保 ‘持不動’亦即不會發生向後倒轉的情形。其原理是，當兩輪車被往後牵行時， 轉動的後輪帶動後輪花轂43使轉動組件42及傳動齒盤41皆轉動，但自由齒盤^ _與轉動組件42為械雙向空轉之對應_，所以自由龍彳彳不受該轉動組件犯 之&曰而仍為不轉動的疋止狀悲，因此鏈條5〇、前齒盤組3〇、曲柄21及腳踏扣 皆不轉動。就使用者而言，若欲牽行兩輪車之前，先將變速單元之槽位切換器 • 80切換至空槽檔位，即可產生曲柄21及腳踏20定位不轉動的功效，牵行兩輪車 麵 時將更為安全、方便。 另值知說明的疋，^兩輪車被騎用時，若使用者不慎切換至空擋檔位， 即會發生腳踏20及曲柄21無法帶動後齒盤組4〇而使車子發生減速或停止問題， 這個問題應加以避免。 壽賴方案之…如第十®，是於檔仙換獅設-活賴止州，該活動 播止片81將該齡切換獅之—般触及空傭位做區隔，騎賴止片^可 、被使用者切換，當者欲切換至空職位時，必需先测該活麟止片81， 以此做為安全裝置，防止騎用兩輪車時誤切至空檔檔位。 解決方案之二，係於該自由齒盤彳彳上設置一安全裝置6〇。如第五圖，該安 王裝置60疋在上述的擋止元件51與自由齒盤彳彳之相對位置設孔6彳，以便供插銷 62穿置定位，據此使轉動組件42、擋止元件51以及自由齒盤杓產生連動關係， 當鏈條50切換至自由齒盤彳彳時，鏈條5〇驅動該自由齒盤” ，該自由齒盤11連動 該擋止元件51及轉動組件42，使後輪花轂43及後輪轉動。就使用者而言，若欲 7 M342338 騎用兩輪車之前，先將該插銷62穿置定位 施 位，仍可確保兩輪車正常運行。 兩輪車時即使切換至空檔檔 圖。目輪車婦#組合餘_柄齡賴的示意 如第2 後移動拖車，而增進了拖車移動的自主性。 /圖’本案上述空觀構1G亦可實施於前齒盤組加。 單⑽料^本案工檔結構之第—實施例顧自由赖11與轉動組件42為 μ ,w^#13, 4，#該卡止賴_向_卡合時，該自《盤μ與 轉42產生連動關係’該自由齒盤11可單向旋轉發揮傳動功能。該卡止 了又一手動之切換件15控制而内縮，使該自由齒#11與該轉動組件42為相 對雙向空轉之對應關係。 .一如第十-至十四圖，實施於前齒盤組3〇之空檔結構31包括—轉動組件泣、 一自由齒盤33以及至少-離合組件34。該轉動组件扣固定於該前齒細〇上隨 其轉動，該自由齒盤33之中心藉由複數個潤滑組件35樞套於該轉動組件32上， 每而與該轉動組件42為相對雙向空轉之對應關係。該離合組件34麟該轉動組件 32上，其可使該轉動組件32連動該自由齒盤33，或者使該自由齒盤33於該轉動 ， 組件32上空轉。 上述轉動組件32包括一環狀的第一轉盤23及一第二轉盤24，該第一轉盤23 及第一轉盤24以其盤面相對結合而固定於該前齒盤組3〇。相對結合的第一轉般 23及第二轉盤24於圓周上形成一齒盤槽25(如第十五圖），用以容置該自由齒盤 33之内圓周331。 如第十六圖，複數個潤滑組件35設置在第一轉盤23及第二轉盤24的對應孔 位231,241中，並且可透過該齒盤槽25而被該自由齒盤33之内圓周331所接觸。 8 M342338 該等潤滑組件35各包括-固定件351幻區套於該固定件351上而可自由轉動的 滾動件352，該自由齒盤33之内圓周331接觸於該滾動件352之表面，藉由該滾 動件352減少該自由齒盤33之轉動磨擦力，使其轉動順暢。 如第十三圖、第十四圖、第十七圖 '第十八圖，該離合組件34包括一操作、 το件341、-旋轉軸心344及-連接軸心346。該操作元件341係藉由該旋轉軸心 344而定位於該第一轉盤23之盤面，並且可以該旋轉軸心344為心而被轉動，該 連接軸心346穿設於該操作元件341，其可穿過該第一轉盤23盤面所設的連接孔 _ 232而穿樞至自由齒盤33盤面的固定孔332，據此，該自由齒盤33與該轉動組件 32具有連動之相對關係’亦即該轉動組件32可連動該自由齒盤33。 該旋轉軸心344的外部樞套一彈簧345，該彈簧345介於該旋轉軸心344的頭 部與操作元件341之間，該彈簧345使該操作元件341常態地靠合在該第一轉盤 • 23的盤面。施予一壓縮該彈簧345之作用力，可使該操作元件341脫離該第一轉 -· 盤23的盤面，並且使該連接軸心346脫離該第一轉盤23之連接孔232以及該自由 齒盤33之固定孔’解除該自由齒盤33與該轉動組件32之連動關係，而使該使該 自由齒盤33於該轉動組件32上空轉。 ® 該第一轉盤23之盤面於該連接孔232之鄰近位置另設一接收孔233，該操作 元件341以該旋轉軸心344為心而被轉動，使該連接軸心346脫離連接孔232及固 ，定孔332時，該接收孔233可接收該連接軸心346，該操作元件341仍得被定位在 第一轉盤23之盤面，而避免其任意旋轉干擾其他組件。 第十九圖為本案空檔結構實施於前齒盤組之平面圖。上述的檔位切換器8〇 可使鏈條50於自由齒盤33及前齒盤組30上切換。若鏈條50掛鏈於自由齒盤33 上，且上述操作元件341之連接轴心346脫離該第一轉盤23之連接孔232及自由 齒盤33之固定孔332，表示該自由齒盤33可於該轉動組件32上空轉，此時使用 者牵動該兩輛車往後移動時，轉動的後輪帶動輪花較43而使鏈條50牽動該自由 9 M342338 齒盤33，自由齒盤33於該轉動組件32上空轉，因此轉動組件32即不會連動該前 齒盤組30，因此與前齒盤組3〇相關的曲柄21即不會發生向後倒轉的情形。 反之，操作元件341之連接軸心346穿樞於該第一轉盤23之連接孔232及自 由齒盤33之固定孔332，表示該自由齒盤33與該轉動組件32具相互連動關係， 此時轉動曲柄21即可使前盤組3〇帶動該轉動組件32及自由齒盤33轉動，而使兩 輪車前行。 雖然本案是以一個最佳實施例做說明，但精於此技藝者能在不脫離本案精 •神與範驁下做各種不同形式的改變。以上所舉實施例僅用以說明本案而已，非 用以限制本案之範圍。舉凡不違本案精神所從事的種種修改或變化，倶屬本案 申請專利範圍。 【圖式簡單說明】 第一圖係以折疊兩輪車為例說明本案實施樣態之立體外觀圖。 •第二圖係本案空檔結構實施於後齒盤組之立體分解圖。 第二圖係本案空檔結構實施於後齒盤組之剖面圖。 第四圖係本案空檔結構實施於後齒盤組之平面圖。 _第五_本毅餘構合併_安全組件之平關。 第六圖係折疊兩輪車於折疊狀態時配合本案空檔結構可自由前後移動之立體外 、 觀圖。 第七圖係折疊兩輪車於折疊狀態時配合本案空檔結構可自由前後移動之側視 圖。 ^八圖係本毅舰構實施於_餘之立體分解圖。 第九圖係本案之触城ϋ附加活麟止)i之示意圖。 第十圖為本案空檔結構之另一實施示意圖。 第十圖社案實施於前《組之空繼構之立體分顯。 M342338 第十二圖為依據第十一圖所繪之組合外觀圖。 由齒盤與柄組件連動。 ^ M ^與軸崎為相對空轉 第十三圖為依據第十二圖所繪之前視圖，表示自 第十四圖為依據第十二圖所繪之前視圖，表示自 之對應關係。 第十五圖為第十三圖中15-15局部剖面圖。 第十六圖為第十三圖中16-16局部剖面圖。 第十七圖為第十三圖中17-17局部剖面圖。 示意圖。 第十八圖為依據第十七圖表現·元件脫麟—轉盤的動作 第十九圖為本案空檔結構實施於前齒盤組之平面圖。作 【主要元件符號說明】 10- 空檔結構 11- 自由齒盤 12- 轴承 13- 單向棘齒 14- 卡止件 15- 切換件 20-腳踏 21 曲柄 23- 第一轉盤 231- 孔位 232- 連接孔 233- 接收孔 24- 第二轉盤 241-孔位 25-齒盤槽 30- 前齒盤組 31- 空檔結構 32- 轉動組件 33- 自由齒盤 331-内圓周 332_固定孔 34- 離合組件 341-操作元件 344_旋轉轴心 345- 彈簧 346- 連接軸心 35- 潤滑組件 351-固定件 352-滾動件 40-後齒盤組 41_傳動齒盤 42-轉動組件 43_後輪花轂 50_鏈條 51-擋止元件 60- 安全裝置 61- 孔 62- 插銷 70-置物籃架 80- 檔位切換器 81- 活動擋止片 11M342338 ★ • VIII. New Description·· [New Technology Field] This case is a neutral structure that can be mounted on a wheeled vehicle with a gear unit or a flywheel unit. The wheeled vehicle includes, but is not limited to, a two-wheeled vehicle, a tricycle, a companion vehicle, a folding vehicle, etc. The neutral structure can make the toothed disc device or the flywheel device empty; ff freely rotates, so that the pedal and the crank do not rotate when the vehicle is turned or reversed by the user. [Prior Art] • The problem that users often face when they are moving bicycles is that during the process of the bicycle being moved backwards, the pedals and the cranks will be reversed backwards. 'The pedals are easy to collide with foreign objects, if the user is standing on the side of the bicycle. On the other hand, the chance of the inverted crank pedal hitting the foot is quite high. • Folding cars are also facing the above problems. If you want to move the folded bicycle backwards, the inverted pedals and the curlers will also get stuck in the car body, and the car will be mixed and secret. The applicant has previously mentioned (4) the folding age of the vehicle and the (4) telescopic cargo (4) scheme. This scheme enables the folding two-wheeled vehicle to be used as a storage trailer, and the function of moving the goods is now applied for a patent. And the problem of the above-mentioned pedal and crank reversal limits the autonomy of the trailer movement, and causes the two-wheeled vehicle to be trapped when it is reversing in the electric system or other narrow spaces where it cannot be rotated. hurt. ^ [New Content] The main purpose of this creation is to solve the problem that the pedals and the cranks will be reversed when the two-wheeled vehicle moves backwards. The technical solution for the above purpose is to provide a neutral structure for the two-wheeled vehicle, the gear plate includes a free-toothed disk and a bearing, and the rotating component of the toothed disk group in the free-toothed disk makes the 兮π t fox And the rotating component and the free toothed disc are in a relatively two-way idle relationship. The chain of the two-wheeled vehicle can be switched on the sprocket wheel set and the free sprocket wheel by controlling the arrogant and slamming _ τ 逯 逯 7L. Change 5 M342338 兀Setting - Empty tilting indicates that the chain is chained to freedom. The free tooth county is provided with a safety device, and the female full device makes the free toothed disc and the toothed disc group form a linkage relationship. In this case, the slave-systemist (4) when the two-wheeled vehicle is moving backwards, the crank and the scales do not move, avoiding the crank and the pedals from colliding with foreign objects or bumping the user's foot, and it is safer to move the two-wheeled vehicle. ,Convenience. The second effect of this case is that when the two-wheeled vehicle is folded and used with the storage basket to become a trailer, the trailer can be moved forward or backward because of the foot and the crank, so that the trailer can be driven to move. Φ The three functions of the case Before the two-wheeled vehicle is used, the user can set the safety device first, so that the free w disk and the toothed disk group form a linkage, and the pedal and the crank can be freely separated to ensure two The normal operation of the wheeled vehicle and the safety of riding. [Embodiment] - #第-图' is a folding two-wheeled vehicle as an example to illustrate the appearance of the empty mark structure in this case. • The components associated with the empty hull of this case include the foot, the crank 21, the front sprocket set 3Q, the rear sprocket set 4〇, and the chain 50. In the first and fourth figures, the empty structure of the case is implemented in the three-dimensional exploded view of the rear sprocket set and the stenciled view. The U! disk set 4 〇 includes a plurality of transmission spurs 41, and the diameter of the transmission sprocket 41 And the number of teeth has a class change, and each of the drive clocks 41 is exposed to the lie-down assembly 42, which is pivoted to the end of a rear wheel and sulfur 43. The above-mentioned transmission toothed disc 41, the rotating component 42, and the rear wheel flower have a interlocking relationship with each other. The feature of the present invention is that the _ rear sprocket set 4 〇 _ 空 结构 结构 , 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空 空The bearing member is pivoted on the rotating member, and the member 12 allows the rotating member 42 and the free toothed plate μ to be in a relatively two-way idle relationship. The gear structure 1 can be added to the original rear chainring. The group 4〇 can also be modified by any of the rear gear trays 41 of the rear chain gear set 4〇. In the embodiment of the present invention, the smallest diameter of the toothed disc is the free meeting disc μ. In the figure, the number M342338 is 51, which is fixed to the rotating assembly 42 for the shaft and the free shuttle 1 and other gears μ. The chain lion can be switched by the control of the two-wheeler Wei unit _ on each transmission _ fine and free sprocket ^ ^ •. It is worthwhile to make the change of the age of the city lion set - the age of the key indicates that the key chain 50 is chained to the free dragon 1 彳, the scaly to the lie, the crank 21 and the pedal 2 〇 'That is, there will be no backwards. The principle is that when the two-wheeled vehicle is pulled backwards, the rotating rear wheel drives the rear wheel hub 43 to rotate the rotating component 42 and the transmission toothed disc 41, but the free-toothed disk _ and the rotating component 42 are mechanically bidirectional. The idling corresponding _, so the free dragon 彳彳 is not subject to the rotating component and is still not rotating, so the chain 5 〇, the front sprocket set 3 〇, the crank 21 and the pedal buckle are Do not turn. As far as the user is concerned, if the two-wheeled vehicle is to be taken, the slot switcher 80 of the shifting unit is switched to the empty slot position, so that the crank 21 and the pedal 20 can be positioned and rotated. It will be safer and more convenient when using two-wheeled vehicles. Another value is known. When the two-wheeled vehicle is being used, if the user accidentally switches to the neutral gear position, the pedal 20 and the crank 21 cannot drive the rear toothed plate group 4〇, causing the car to slow down or Stop the problem, this problem should be avoided. The Shou Lai program... such as the tenth®, is in the sacred lion set-live 止 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州 州It can be switched by the user. When switching to an empty position, the live collar piece 81 must be measured first as a safety device to prevent mis-cutting to the neutral position when riding the two-wheeled vehicle. The second solution is to install a safety device 6〇 on the free toothed disc. As shown in the fifth figure, the Angkor device 60 is provided with a hole 6 疋 at a position opposite to the above-mentioned blocking member 51 and the free sprocket 彳, so that the pin 62 can be placed and positioned, thereby rotating the assembly 42 and the stopping member. 51 and the free sprocket 杓 generate a linkage relationship. When the chain 50 is switched to the free sprocket 彳彳, the chain 5 〇 drives the free sprocket, and the free sprocket 11 interlocks the blocking element 51 and the rotating component 42 to The wheel hub 43 and the rear wheel rotate. For the user, if the 7 M342338 is to be used for the two-wheeled vehicle, the pin 62 is placed in the positioning position to ensure the normal operation of the two-wheeled vehicle. Even if you switch to the neutral gear map, the eye-wheeled car woman #组合余_柄龄赖 is the second to move the trailer, which enhances the autonomy of the trailer movement. / Figure 'The above-mentioned air view structure 1G can also be implemented in The front sprocket set is added. The single (10) material ^ the first step of the case structure - the embodiment of the free lag 11 and the rotating component 42 is μ, w ^ #13, 4, # the card _ _ _ _, the Since "the disk μ and the turn 42 are in a linked relationship", the free-toothed disk 11 can be rotated in one direction to function as a transmission. The manual switching member 15 is controlled to be retracted so that the free tooth #11 and the rotating assembly 42 are in a relatively two-way idle relationship. As shown in the tenth to fourteenth drawings, the front toothed plate group 3 is implemented. The gear structure 31 includes a rotating component weeping, a free toothed disk 33 and at least a clutch assembly 34. The rotating component is fastened to the front toothed pin and rotates therewith, and the center of the free toothed disk 33 is composed of a plurality of lubricating components 35 is pivoted on the rotating component 32, and is corresponding to the two-way idling relationship with the rotating component 42. The clutching component 34 is coupled to the rotating component 32, which allows the rotating component 32 to interlock the free sprocket 33. Alternatively, the free toothed disc 33 is idly rotated on the assembly 32. The rotating assembly 32 includes an annular first turntable 23 and a second turntable 24, the first turntable 23 and the first turntable 24 being opposed to each other by the disk surface thereof. The first set of teeth 23 and the second turntable 24 are formed on the circumference to form a toothed groove 25 (such as the fifteenth figure) for accommodating the free toothed disc. 33 inner circumference 331. As shown in the sixteenth figure, a plurality of lubrication components 35 are provided The corresponding positions 231, 241 of the first turntable 23 and the second turntable 24 are disposed and can be contacted by the inner circumference 331 of the free sprocket 33 through the sprocket groove 25. 8 M342338 The lubricating assemblies 35 each include - The fixing member 351 is disposed on the fixing member 351 and the freely rotatable rolling member 352. The inner circumference 331 of the free toothed disc 33 contacts the surface of the rolling member 352, and the free toothed disc is reduced by the rolling member 352. The rotational friction of 33 rotates smoothly. As in the thirteenth, fourteenth, and seventeenth aspects, the eighteenth figure, the clutch assembly 34 includes an operation, a member 341, a rotation axis 344, and - Connect the shaft 346. The operating element 341 is positioned on the disk surface of the first turntable 23 by the rotating shaft 344, and can be rotated by the rotating shaft center 344. The connecting shaft 346 is disposed through the operating element 341. The fixing hole 332 of the disk surface of the free toothed disc 33 can be pivoted through the connecting hole _232 provided on the disk surface of the first turntable 23, whereby the free toothed disk 33 and the rotating component 32 have an interlocking relationship That is, the rotating assembly 32 can interlock the free toothed disc 33. The outer portion of the rotating shaft 344 is sleeved with a spring 345. The spring 345 is interposed between the head of the rotating shaft 344 and the operating member 341. The spring 345 normally causes the operating member 341 to abut the first turntable. • 23 face. Applying a force to compress the spring 345, the operating member 341 can be disengaged from the disk surface of the first rotary-disc 23, and the connecting shaft 346 can be disengaged from the connecting hole 232 of the first turntable 23 and the free tooth. The fixing hole of the disk 33 releases the interlocking relationship between the free toothed disc 33 and the rotating assembly 32, so that the free toothed disc 33 is idling on the rotating assembly 32. A receiving hole 233 is further disposed in the vicinity of the connecting hole 232 of the disk surface of the first turntable 23, and the operating element 341 is rotated about the rotating axis 344 to disengage the connecting axis 346 from the connecting hole 232 and When the hole 332 is fixed, the receiving hole 233 can receive the connecting shaft 346, and the operating element 341 still has to be positioned on the disk surface of the first turntable 23, and avoid any rotation thereof to interfere with other components. The nineteenth figure is a plan view of the present invention in which the neutral structure is implemented on the front sprocket set. The gear shifter 8A described above can switch the chain 50 on the free chain gear 33 and the front chain gear unit 30. If the chain 50 is chained to the free sprocket 33, and the connecting axis 346 of the operating element 341 is separated from the connecting hole 232 of the first turntable 23 and the fixing hole 332 of the free sprocket 33, the free sprocket 33 can be The rotating assembly 32 is idling. When the user moves the two vehicles backwards, the rotating rear wheel drives the wheel to rotate the chain 50 to cause the chain 50 to move the free 9 M342338 toothed disk 33. The rotating assembly 32 is idling, so that the rotating assembly 32 does not interlock the front sprocket set 30, so that the crank 21 associated with the front sprocket set 3〇 does not reverse backward. On the contrary, the connecting shaft 346 of the operating element 341 is pivoted to the connecting hole 232 of the first dial 23 and the fixing hole 332 of the free toothed disc 33, indicating that the free toothed disc 33 and the rotating component 32 are interlocked with each other. Rotating the crank 21 causes the front disc unit 3 to drive the rotating assembly 32 and the free-toothed disc 33 to rotate, so that the two-wheeled vehicle advances. Although this case is illustrated by a preferred embodiment, it is true that those skilled in the art can make various changes in form without departing from the essence of the case. The above embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Any modification or change that is not in violation of the spirit of the case is the scope of application for patent in this case. [Simple description of the drawings] The first figure shows a three-dimensional appearance of the implementation of the present case by taking a folding two-wheeled vehicle as an example. • The second figure is an exploded view of the rear gear set of the case. The second figure is a sectional view of the case where the neutral structure is implemented in the rear sprocket group. The fourth figure is a plan view of the neutral structure of the case implemented on the rear sprocket set. _ Fifth _ Ben Yi Yu construction combined _ security components of the customs. The sixth picture is a three-dimensional external view and a view of the folded two-wheeled vehicle in the folded state in conjunction with the neutral structure of the case. The seventh figure is a side view of the folding two-wheeled vehicle in the folded state with the neutral structure of the case being free to move back and forth. ^ Eight diagrams are based on the three-dimensional exploded view of the Yi Yi ship structure. The ninth picture is a schematic diagram of the contact case of the case. The tenth figure is another schematic diagram of the implementation of the neutral structure of the present case. The tenth picture of the social case was implemented in the previous "three-dimensional display of the group's empty succession. M342338 The twelfth figure is a combined appearance drawing according to the eleventh figure. Linked by the chainring and the handle assembly. ^ M ^ is relatively idling with Axis Thirteenth is a front view according to the twelfth figure, showing a front view according to the twelfth figure from the fourteenth figure, showing the corresponding relationship. The fifteenth figure is a partial cross-sectional view of 15-15 in the thirteenth figure. Figure 16 is a partial cross-sectional view of 16-16 in the thirteenth figure. Figure 17 is a partial cross-sectional view of 17-17 in the thirteenth diagram. schematic diagram. Figure 18 is a diagram showing the operation of the component according to the seventeenth figure. The nineteenth figure is a plan view of the neutral gear structure of the front tooth plate group. [Main component symbol description] 10-Neutral structure 11- Free toothed disc 12- Bearing 13- One-way ratchet 14- Locking piece 15--Switching part 20-Pedal 21 Crank 23- First turntable 231- Hole position 232- Connection hole 233- Receiving hole 24- Second turntable 241- Hole position 25-ring groove 30- Front chain set 31- Neutral structure 32- Rotating unit 33- Free toothed disc 331-Inner circumference 332_Fixed hole 34- Clutch assembly 341 - Operating element 344_ Rotary shaft 345 - Spring 346 - Connection shaft 35 - Lubrication assembly 351 - Fixing member 352 - Rolling member 40 - Rear sprocket set 41 - Drive sprocket 42 - Rotating assembly 43_ Rear wheel hub 50_Chain 51-stop element 60- Safety device 61- Hole 62- Pin 70-Storage basket 80- Position switch 81- Active stop 11