201144148 六、發明說明： 【發明所屬之技術領域】 本發明係有關於一種自行車之齒盤。 【先前技術】 各头自行車之齒盤多為圓形之齒盤，如專利Tw^353889 號所述，將齒翻設於曲柄，供使用者踩踏帶動曲柄轉動，進 -步帶動《與自行車之傳動機構作動，但人體於踩踏動作中 ❿ 係以腿部施力，較適於上下往復推動，而非於曲柄轉動過程中 均勻施力’使腿部於曲柄轉動至各個角度時產生不同的施力， .將使較大或較小的力量形成㈣，令朗者的踩踏效率不易提 升。 【發明内容】 本發明之主要目的在於提供—種自行車之齒盤，可提升自 行車傳動機構的工作效率。201144148 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a toothed disc for a bicycle. [Prior Art] The toothed disc of each bicycle is mostly a circular toothed disc. As described in the patent Tw^353889, the tooth is turned over to the crank for the user to step on the crank to rotate, and to drive the bicycle. The transmission mechanism is actuated, but the human body applies the force to the legs during the pedaling operation, which is more suitable for reciprocating the upper and lower reciprocating motions, instead of uniformly applying the force during the cranking process, so that the legs are different when the crank is rotated to various angles. Force, will make larger or smaller forces form (4), making it difficult for the man to pedal. SUMMARY OF THE INVENTION The main object of the present invention is to provide a bicycle toothed disc that can improve the working efficiency of the bicycle transmission mechanism.
為達成上述目的，本發明提供-種自行車之缝，包括有 -盤體與複數齒。於該健之形心定義—中心轴，該中心轴垂 直於該盤體’於該健周緣定義二第—基點、二第二基點與二 第三基點，該二第一基點對稱於該中心軸，以該二第二基點: 連線定義-第-軸線’該二第二基點對稱於該中心軸，以該二 第二基點之連線定義m該二第三1崎稱於該中心 轴’以該二第三基點之連線定義-第三軸線；該第-軸線盘該 第二軸線之關嫌⑷G度，該第—軸線無第三軸線間 201144148 的=角小於85度且大於5G度。於該盤體周緣與該中心轴距離 最遠處定義二第四基點，該二第四基點對稱於該中心軸，該二 第四基點分別位於其中一第二基點與其令一第三基點之間。 以其中-第四基點至該中心轴之距離減去其中一第一基 X中一軸之距離疋義為—全域差值，以該盤體周緣其十一 社該中卻之距軸去其巾—第―基點巾心、軸之距離 定義為-上升值，以其卜上升值與該全域差值之比值定義為 :上升率。該盤體周緣各點之上升率自各該第—基點分別向各 该第二基點遞增，各該第二基點之上升率介於q8至ι之間， 該盤體周緣各狀上鱗自各該第二基齡励各該第四基 點遞增，越體鱗各點之上料自⑽第四基齡別向各該 第三基點遞減，各該第三基點之上升率介於0.8至1之間，該 盤體周緣各點之上升率自各該第三基點分別姑該第-基點 遞減。 • . · · 該些齒％&於雜體’各該齒自該盤制緣徑向凸出。 藉此’本發明所提供之自行車之齒盤可供組裝於自行車 中’於使用者踩踏曲柄，令齒盤轉動至不同角度時，可於齒盤 ’、鍊條間產生:f同的力臂，*可於朗者踩踏至各個位置時， 產生大齒比或倾_不_踩踏效果，提升制者踩踏力量 的利用率。 【實施方式】 以下僅以實施例說明本發明可能之實施態樣 ，然並非用以 201144148 . 限制本發明所欲保護之範疇，合先敘明。 請參考圖1至圖3，本發明提供一種自行車之齒盤，供固 設於自行車中，可於使用者騎乘自行車時轉動，帶動鍊條與其 他齒盤轉動，作為自行車傳動機構的一部份。 該齒盤包括有一盤體1與複數齒2，並可於該盤體固設一 曲柄3。 該盤體1中央可呈鏤空狀，以減輕該齒盤之整體重量。該 φ 盤體1具有一形心，亦即該盤體1之幾何中心，於該盤體1‘之 形心定義一中心軸11，該中心軸11垂直於該盤體1。於該盤 體1周緣定義二第一基點12、12’、二第二基點13、13’與二 第三基點14、14’，並另定義有二第四基點15、15’，其中該 二第一基點12、12’對稱於該中心軸11，以該二第一基點12、 12’之連線定義一第一軸線16，該二第二基點13、13’對稱於 該中心軸，以該二第二基點13、13’之連線定義一第二軸線17, φ 該二第三基點14、14’對稱於該中心轴，以該二第三基點14、 14’之連線定義一第三軸線18，該第一軸線16與該第二軸線 17之間的夾角α約為50度，該第一軸線16與該第三軸線18 間的夾角yS小於85度且大於50度，較佳者，該第一軸線16 與該第三軸線18間的夾角β僅略小於85度。 以該盤體1周緣與該中心軸11距離最遠處定義該二第四 基點15、15’，該二第四基點15、15’對稱於該中心軸11，該 二第四基點15、15’可分別位於其中一第二基點13、13’與其 5 201144148 中第广基點14、14,之間任意一處’較佳者，該二第四基點 15、15’的連線與該第一軸線16之間的夾角τ為60度。 、°亥盤體1周緣各點至該中心軸11的距離自各該第 基點12、12,向各該第二基點13、13，與各該第四基點、 另該盤體1周緣各點至該中心軸U的距離自各該第 四基點15、15,向各該第三基點丨4、14,與各該第一基點12,、 遞咸亦即，越接近各該第四基點15、15，該盤體！周緣各 點至°亥中心輪11的距離越長。更明確地說，定彡-全域差值， 為-中第四基·點15至該中心軸u之距離減去其中一第一基 點12至該中心軸n之距離；定義一上升值，為該盤體！周^ 其中一點至該中心軸11之距離齡其中-第-基點12至該中 心軸11之距離；另定義—上升率，為其t—上升值與該全域 差值之比值；射該倾職轉各點各具有不_上升值盘 上升率’各該第-基點12、12，之上升率為G，麵體i周緣 各點之上升率自各該第—基點12、12，分別向各該第二基點 13、13’遞增至0.8至！之間，該盤體i周緣各點之上升率自各 該第二基點13、13,分別向各該第四基點15、15，遞增至！，該 盤體1周緣各點之上升率自各該第四基點15、15，分別向各該 第三基點14、14,遞減至〇.8至丨之間，該盤體丨周緣各點之 上升率自各該第三基點14、14，分別向其中—第—基點12，、 12遞減至〇。 該些齒2環設於該盤體i，各該齒2自該盤體】周緣捏向 201144148 凸出 该曲柄3固設於該盤體丨，較佳 軸線平行。 減者，麵柄3可與該第- 請參考圖4，藉此，本發明可供裳設於自行車中使用，可 叉使用者踩踏曲柄’繞該中心軸轉動，並帶動鍊條4移動，可 將該曲柄3裝設平行於該第-軸線16 ’當曲柄3受使用者踩 踏帶動而雜至與斜面呈約3G度Μ，叫3位置恰適於 供使用者出力膽，而鍊條4 ,㈣合於鄰近第四基點^之齒， 使盤體1與齒2對鍊條4形成較大之力臂，可帶動鍊條*快速 移動。睛參考圖5，當使用者持續帶動曲柄3轉動，該曲柄3 逐漸轉動接近於與水平面垂直而不適使用者出力踩踏，齒盤i 與鍊條4則逐漸唾合於接近第一基點12、i2，之齒，使鍊條* 之力臂逐漸減小，可供本發明較省力地帶動鍊條4移動。然 而，本發明供使用者將曲柄裝設平行於第二軸線，或令曲柄傾 斜於第一軸線與第二軸線者，亦無不可。 綜上所述’本發日种之齒盤可於使用者適於出力踩踏時提 供較大力臂，快速帶動鍊條移動，並於使用者不適出力踩踏時 減小力臂，省力地帶動鍊條轉動，兼具大齒比與小齒比的使用 特點，可使自行車產生極佳的使用者縣效果，實為具有進步 之功效，符合本國專利法規定之專利要件，爰依法提起專利申 請，鑑請鈞局早日核予專利，實感德便。 7 201144148 【圖式簡單說明】 圖1係本發明之組裝示意圖。 圖2係本發明之立體圖。 圖3係本發明之前視圖。 圖4與圖5係本發明之使用動作示意圖。 【主要元件符號說明】 α:第一軸線與第二軸線之間的夾角 /3 :第一軸線與第三軸線之間的夾角 7:二第四基點連線與第一軸線之間的夾角 1 :盤體 11 :中心軸 12、 12’ ：第一基點 13、 13’ ：第二基點 14、 14’ ：第三基點 15、 15’ ：第四基點 16 :第一轴線 17 :第二軸線 18 :第三軸線 2 :齒 3 :曲柄 4 :鍊條In order to achieve the above object, the present invention provides a bicycle seam comprising a disc body and a plurality of teeth. The centroid of the health defines a central axis, the central axis perpendicular to the disk body defines two base points, two second base points and two third base points on the healthy circumference, the two first base points being symmetric to the central axis The second base point is: the line definition - the first axis 'the second base point is symmetric to the central axis, and the second second base point is defined by the line m. The second third 1st is called the central axis' Defining a third axis by a line connecting the second base points; the second axis of the first axis is less than (4) G degrees, and the first axis has no angle between the third axis of 201144148 = less than 85 degrees and greater than 5 degrees . And defining a second and fourth base points at a distance from the circumference of the disk body and the central axis, wherein the two fourth base points are symmetric with the central axis, and the two fourth base points are respectively located between one of the second base points and a third base point . Taking the distance from the fourth base point to the central axis minus the distance of one of the first bases X as a whole-domain difference, the circumference of the disk body is the axis of the eleventh society. - The distance between the base point and the axis is defined as the - rise value, and the ratio of the rise value to the global difference is defined as the rise rate. The rising rate of each point on the periphery of the disk body is increased from each of the first base points to each of the second base points, and the rising rate of each of the second base points is between q8 and ι, and the circumference of the disk body is scaled from the first The fourth base point of each of the two base ages is increased, and the points above the body scale are decremented from the fourth base point of (10), and the rate of increase of each of the third base points is between 0.8 and 1. The rate of increase of each point on the periphery of the disk body is decreased from the third base point to the first base point. • The teeth %& in the body' each of the teeth project radially from the disc edge. Therefore, the bicycle toothed disc provided by the present invention can be assembled in a bicycle. When the user steps on the crank and rotates the toothed disc to different angles, the same force arm can be generated between the toothed disc and the chain. * When the person steps on to the various positions, it can produce a large gear ratio or a tilting _ no _ pedaling effect, which improves the utilization rate of the pedaling force of the maker. [Embodiment] Hereinafter, the possible embodiments of the present invention will be described by way of examples only, and are not intended to limit the scope of the invention as claimed. Referring to FIG. 1 to FIG. 3, the present invention provides a bicycle toothed disc for fixing in a bicycle, which can be rotated when the user rides the bicycle, and drives the chain and other toothed discs to rotate as a part of the bicycle transmission mechanism. . The chainring includes a disk body 1 and a plurality of teeth 2, and a crank 3 is fixed to the disk body. The center of the disc body 1 can be hollowed out to reduce the overall weight of the chainring. The φ disk body 1 has a centroid, i.e., the geometric center of the disk body 1, and a central axis 11 is defined at the centroid of the disk body 1', which is perpendicular to the disk body 1. Two first base points 12, 12', two second base points 13, 13' and two third base points 14, 14' are defined on the periphery of the disk body 1, and two fourth base points 15, 15' are defined, wherein the two The first base points 12, 12' are symmetric with respect to the central axis 11, and a first axis 16 is defined by a line connecting the two first base points 12, 12'. The two second base points 13, 13' are symmetric with respect to the central axis. The line connecting the second base points 13, 13' defines a second axis 17, φ the second base points 14, 14' are symmetric with respect to the central axis, and a line connecting the second base points 14, 14' defines a The third axis 18, the angle α between the first axis 16 and the second axis 17 is about 50 degrees, and the angle yS between the first axis 16 and the third axis 18 is less than 85 degrees and greater than 50 degrees. Preferably, the angle β between the first axis 16 and the third axis 18 is only slightly less than 85 degrees. The second and fourth base points 15, 15' are defined at a distance from the circumference of the disk body 1 and the central axis 11. The two fourth base points 15, 15' are symmetric with respect to the central axis 11, and the second and fourth base points 15, 15 'Can be located at any one of the second base points 13, 13' and its 5 201144148, the broad base points 14, 14 between any of the 'better, the second and fourth base points 15, 15' and the first The angle τ between the axes 16 is 60 degrees. The distance from each point of the circumference of the 1st plate body to the central axis 11 is from the respective base points 12, 12 to the respective second base points 13, 13 and the respective fourth base points and the periphery of the disk body 1 to The distance from the central axis U to each of the fourth base points 15, 15 to each of the third base points 丨4, 14 and each of the first base points 12, the salty, that is, the closer to the fourth base points 15, 15 , the body! The longer the distance from the periphery to the center wheel 11 of the sea. More specifically, the 彡-global difference is the distance from the fourth base point 15 to the central axis u minus the distance from one of the first base points 12 to the central axis n; defining a rising value, The plate! Week ^ the distance from the point to the central axis 11 is the distance from the - base point 12 to the central axis 11; another definition - the rate of rise, the ratio of its t-rise value to the global difference; Each of the points has a non-rising disk rise rate 'the base point 12, 12, and the rate of increase is G, and the rate of increase of each point of the periphery of the facet i is from each of the first base points 12, 12, respectively. The second base point 13, 13' is incremented to 0.8 to! The rise rate of each point on the periphery of the disk body i is incremented from each of the second base points 13 and 13 to each of the fourth base points 15, 15 to! The rising rate of each point of the circumference of the disk body 1 is decreased from each of the fourth base points 15, 15 to each of the third base points 14, 14 to between 〇.8 and 丨, and the rise of the circumference of the disk body The rate is reduced from each of the third base points 14, 14 to the first - base point 12, 12, respectively. The teeth 2 are disposed on the disc body i, and the teeth 2 are pinched from the circumference of the disc body to the 201144148. The cranks 3 are fixed to the disc body, and the axes are preferably parallel. The reduction handle, the handle 3 can be associated with the first - please refer to FIG. 4 , whereby the present invention can be used in a bicycle, and the fork user can step on the crank to rotate around the central axis and drive the chain 4 to move. The crank 3 is mounted parallel to the first axis 16'. When the crank 3 is driven by the user to be pedaled to be about 3G degrees with the slope, the position 3 is suitable for the user to output the force, and the chain 4, (4) Cooperating with the teeth adjacent to the fourth base point ^, the disk body 1 and the tooth 2 form a large force arm for the chain 4, which can drive the chain * to move quickly. Referring to FIG. 5, when the user continues to drive the crank 3 to rotate, the crank 3 gradually rotates close to the horizontal plane and the user does not force the pedaling, and the toothed disc i and the chain 4 gradually squirt close to the first base point 12, i2. The teeth of the chain gradually reduce the force arm of the chain*, so that the present invention can move the chain 4 more labor-savingly. However, the present invention is not useful for the user to mount the crank parallel to the second axis or to tilt the crank to the first axis and the second axis. In summary, the 'spindle of the hair type can provide a large force arm when the user is suitable for stepping on the pedal, quickly drive the chain to move, and reduce the force arm when the user is uncomfortable to step on the pedal, and labor-saving to drive the chain to rotate, The combination of large gear ratio and small gear ratio can make the bicycle produce excellent user county effect. It has the effect of improvement, conforms to the patent requirements of the national patent law, and filed a patent application according to law. As soon as the bureau approved the patent, it was really sensible. 7 201144148 [Simplified illustration of the drawings] Fig. 1 is a schematic view of the assembly of the present invention. Figure 2 is a perspective view of the present invention. Figure 3 is a front view of the invention. 4 and 5 are schematic views of the operation of the present invention. [Description of main component symbols] α: the angle between the first axis and the second axis / 3: the angle between the first axis and the third axis 7: the angle between the line connecting the second and fourth base points and the first axis 1 : disk 11 : central axis 12 , 12 ′ : first base point 13 , 13 ′ : second base point 14 , 14 ′ : third base point 15 , 15 ′ : fourth base point 16 : first axis 17 : second axis 18: third axis 2: tooth 3: crank 4: chain