M384153 五、新型說明： 【新型所屬之技術領域】 本 本創作大體上關於一種自行車曲柄臂。更特定而a 創作係關於一種經構形以便以一種壓入配合方式安^ 自行車曲柄轴上的自行車曲柄臂。 【先前技術】 騎自行車Μ為—種越來越流行㈣遣形以及—種運 輸方式。此外，對於業餘及職業人士來說，騎自行車成為 -種極為流行的競技運動。不論自行車係用於消遣、運输 或者競技’自行車工業正不斷改進自行車的多種組件。」 個密集地被重新設計的組件係自行車曲柄臂。 通常而言，-自行車曲柄臂以—種壓人配合方式不可旋 轉地輕合至一自行車曲柄轴。根據最新技術水準，需要— 種專用的習知曲柄移除工具以便從該曲柄軸移除曲柄臂。 為連同該曲柄移除工具使用此一種曲柄臂，當前需要在該 曲柄臂之一安裝開口上形成一内螺紋部，其中該螺紋部經 構形以與該曲柄移除工具之一螺紋部接合。對一專用的曲 柄移除工具的需求係一缺點。此外，對於在該曲柄臂之安 裝開口上提供一内螺紋部的需求亦係一缺點。 赛於上述’基於此揭示内容，對於技術熟練者來說顯而 易見的係存在對於一種改進之自行車曲柄臂的需求。本創 料決先前技術中的此需求以及其他需求，基於此揭示内 容，該等需求對於技術熟練者來說顯而易見。 【新型内容】 M384153 本創作之-目的储供—種具有簡單且精簡之結構的自 行車曲柄臂。本創作之另-目的係提供-種可輕鬆且順滑 地從一曲柄軸移除的自行車曲柄臂。 上述該等目的基本上可藉由提供—種自行車曲柄臂而實 現，該自行車曲柄臂包含一安裝部，而該安裝部包含 構形及配置以耦合至—曲柄轴的安裝開口以及至少一個凹 ^ °亥至少一個凹口經構形及配置於一相對於該安裝開口 實質周向延伸之外表面中，以便與—用職該曲柄轴移除 ，自行車曲柄臂之工具接合。利用如此—種自行車曲柄 臂，將不再需要使用一專用的曲柄移除工具。 在-較佳實施例中’該凹σ包括—相對於該安裝開口實 質上徑向延伸的實質上平坦之表面，特別是相對於該安裝 ^之中心軸形成一銳角使得用於移除該自行車曲柄臂的 工具在施加一移除力於該安裝部上時不易於從其滑開。 ▲在—較佳實施例中’該凹口之該開口具有圓角。因此， 该凹口對塵土的敏感性特別低。 在—較佳實施例中，該凹口之底部為一實質上平扫的 特別疋貫質上平行於該安裝開口之一切線而延伸。 在一較佳實施例中，該凹口的所有角為圓形。 在—較佳實施例中，該安裝開口為一非螺紋安裝開口。 換言之，不再需要在該自行車曲柄臂之安裝開口上提供— 螺紋部。因此，本創作之自行車曲柄臂具有—種簡單的構 造及一更精簡的安裝部。 在—較佳實施例中，該安裝開口包含經構形及配置以便 M384153 以一種壓入配合方式耦合至該 缺口。 曲柄軸上之鋸齒缺口的鋸齒 又貫施例中，提供兩個經構形及配置以便與〆習 知的滑輪移除式工具耦合的凹口。 在一較佳實施例中，# @ 〜荨凹口以圓周平均分布之方式配 置。M384153 V. New description: [New technical field] The book is generally about a bicycle crank arm. More specifically, a creation relates to a bicycle crank arm that is configured to fit a bicycle crankshaft in a press fit manner. [Prior Art] Cycling is becoming more and more popular (4) detours and transport methods. In addition, for amateurs and professionals, cycling has become an extremely popular competitive sport. Whether the bicycle is used for recreation, transportation or competition, the bicycle industry is constantly improving the various components of the bicycle. An intensively redesigned component is a bicycle crank arm. In general, the bicycle crank arm is non-rotatably coupled to a bicycle crankshaft in a press-fit manner. According to the state of the art, a special conventional crank removal tool is required to remove the crank arm from the crankshaft. To use this type of crank arm in conjunction with the crank removal tool, it is currently desirable to form an internal threaded portion on one of the crank arm mounting openings, wherein the threaded portion is configured to engage a threaded portion of the crank removal tool. The need for a dedicated crank removal tool is a disadvantage. Moreover, the need to provide an internal threaded portion on the mounting opening of the crank arm is also a disadvantage. Based on the above disclosure, it is apparent to those skilled in the art that there is a need for an improved bicycle crank arm. This innovation is based on this and other needs in the prior art, and based on this disclosure, such needs are readily apparent to those skilled in the art. [New content] M384153 The purpose of this creation - the purpose of storage - a simple and streamlined structure of the bicycle crank arm. Another object of the present invention is to provide a bicycle crank arm that can be easily and smoothly removed from a crankshaft. The above objects can basically be achieved by providing a bicycle crank arm that includes a mounting portion that includes a mounting opening configured and configured to be coupled to the crankshaft and at least one recess ^ At least one notch is configured and disposed in a substantially circumferentially extending outer surface relative to the mounting opening for engagement with the tool of the bicycle crank arm. With such a bicycle crank arm, it is no longer necessary to use a dedicated crank removal tool. In the preferred embodiment 'the recess σ comprises - a substantially flat surface extending substantially radially with respect to the mounting opening, in particular forming an acute angle relative to the central axis of the mounting for removal of the bicycle The tool of the crank arm does not easily slide away from it when a removal force is applied to the mounting portion. ▲ In the preferred embodiment, the opening of the recess has rounded corners. Therefore, the notch is particularly sensitive to dust. In the preferred embodiment, the bottom of the recess extends in a substantially flat sweep, particularly across all lines parallel to the mounting opening. In a preferred embodiment, all of the corners of the recess are circular. In a preferred embodiment, the mounting opening is a non-threaded mounting opening. In other words, it is no longer necessary to provide a threaded portion on the mounting opening of the bicycle crank arm. Therefore, the bicycle crank arm of the present invention has a simple construction and a more compact mounting portion. In a preferred embodiment, the mounting opening includes a configuration and configuration such that the M384153 is coupled to the gap in a press fit manner. The serration of the serrated notch on the crankshaft. In still another embodiment, two notches are provided that are configured and configured to couple with a conventional pulley-removal tool. In a preferred embodiment, the #@~荨 notches are configured in a circumferentially evenly distributed manner.
在一較佳實施财，—對凹口被配置於該安裝部之相對 側上，特別是該安裝開口之相對側上。 m施例中’提供_圍繞該安裝部（特別是圍繞 該安裝開口）至少延伸超過50%的單一凹口。 在較佳只施例中，該至少一個凹口被提供於該安裝開 口附近。 "在較佳貫施例中，該至少—個凹σ實質上平行於該自 行車曲柄臂之一縱軸延伸。In a preferred embodiment, the recesses are disposed on opposite sides of the mounting portion, particularly on opposite sides of the mounting opening. The m embodiment provides a single recess that extends at least over 50% around the mounting portion (particularly around the mounting opening). In a preferred embodiment, the at least one notch is provided adjacent the mounting opening. " In a preferred embodiment, the at least one concave σ extends substantially parallel to a longitudinal axis of the bicycle crank arm.
在一較佳實施例中，該安裝部包含一凹槽（切口）及一支 座。相槽及該支座經構形及配置使得—提供於該曲柄轴 上的間隔物能接觸該支座。較佳的係該凹槽及/或該支座 圍繞該安裝開口延伸。 在一較佳實施例中，該自行車曲柄臂包含一在該安裝部 及—腳踏板附接部之間延伸的曲柄基部。該曲柄基部在其 中匕3中空空間使得該曲柄基部作為一中空輪廓而提 供。 在—較佳實施例中，該安裝部為一個實質上圓形的貫穿 孑L* 〇 6亥自行車曲柄可以上述方式形成及修 、態樣及特徵可以任何方式彼此組合 例 改。上述該等實施 如^=料_詳細描述揭示本創作之—較佳實施例之 對於枯二細Μ，本創作的此等及其它㈣、特徵及優點 、：技術热練者來說將變得顯而易見。 【實施方式】 _本^1作之所選實施例將參考該等圖式而被說明。自此揭 不内谷中’對於技術熟練者來說顯而易見的係本創作之實 施例的如下描述僅提供用於說明，其目的不在於限制由該 等隨附請求項及其等效物所界定的本創作。 一杈向s，—自行車之一曲柄總成基本上包含一右曲柄 臂、一左曲柄臂、一曲柄軸、一個或多假鏈輪及—對腳踏 板。通常該右曲柄臂具有一個或多個耦合至右曲柄臂的鏈 輪。該右曲柄臂、該曲柄軸、該一個或多個鏈輪及該等一 對腳踏板較佳為在技術中熟知的習知組件。因此，這也組 件在此將不被詳細描述。 首先參考圖1，其說明一根據本創作之一實施例的左曲 柄臂10。該曲柄臂1〇包含一第一自由端10,（内自由端）及一 第二自由端(外自由端）。該曲柄臂10包含一安裝部11、 一腳踏板附接部30及一曲柄基部20。該安裝部11經配置於 該第一自由端10'上且該腳踏板附接部30經配置於該第二自 由端10"上。該曲柄基部20在該第一自由端1〇,及該第二自 由端10"之間延伸。 該女裝部11包含一安裝開口 12，該安裝開口 12較佳具有 μ观53 一實質上圓形的形狀。該安裝部U(特別是該安裝開口 12) 經構形及配置以便以一種愿入配合方式非旋轉地柄合至_ 曲柄軸5 0(見圖8)。該安裝開口 u之内圓周面之一部分具有 錯齒缺口 ’該等鑛齒缺口用於非旋轉地接合被提供於該曲 柄軸50之一外圓周面上的相配鋸齒缺口。較佳的是，腳踏 板附接部30包含—開口，該開口具螺紋以便以一種習知方 式將腳踏板（未顯示）的轴固定耦合至腳踏板附接部3〇 上。 該曲柄臂10進一步包含至少一個提供於該第一自由端 10’上的凹口 13。該至少一個凹口被提供於一相對於該安裝 開口 12貫質上沿圓周而延伸的外表面中。在圖i所顯示的 實施例中，提供有兩個凹口 13。該等兩個凹口 13被提供緊 鄰该安裝開口 12，即在該安裝開口 12附近。該等凹口。較 佳係配置在安裝開口 12之相對側上。較佳的是該等凹口 13相對於該曲柄臂1〇之一縱軸A(見圖i之直線A)對稱地對 準，及/或相對於該曲柄開口 12之中心對稱地對準。更佳 的是，該等凹口 13實質上平行於該曲柄臂1〇之縱軸八延 伸。因此，當從該曲柄軸50移除該曲柄臂1〇時只在圖8之 方向B中產生一縱向力，其將提供一種簡單且順滑的移 除。或者’複數個分離的凹口可至少部分地圍繞該安裝部 11而提供’特別是圍繞該安裝開口 12。或者，可提供一至 少部分圍繞該安裝部11延伸的單一凹口，特別是圍繞該安 裝開口 12。 圖1所顯示的兩個凹口 1 3經構形及配置而以與一習知的 月輪移除工具（見圖8)接合自行車曲柄臂i〇 在該自行車曲柄臂之安裝開口上提供-螺紋部以 、接口 -特別的曲柄移除工具。因此，該安裝開口 :非螺紋安裝開口。換言之，該安裝開σ12之内表面不具 工用以接合-用於移除該自行車曲柄㈣的特別曲柄移除 工具的螺紋。—種現有的滑輪移除工具（見圖8)可作為用以 將該曲柄臂10從該曲柄軸5〇移除的工具。因此，與習知的 自行車曲柄臂相比’自行車曲柄臂1〇具有一更簡單的構造 及一更精簡的安裝部U。 圖2為圖1所顯示的曲柄臂1〇沿著圖4之直線A·"所示的 截面圖。圖2圖解說明第一及第二自由端1〇，、1〇，，、安裝部 U、安裝開口 12、一較佳提供於該第一自由端1〇，上的凹槽 14、曲柄基部20及腳踏板附接部3〇。該凹槽14係提供於該 安裝部11上。此外，一支座15(見圖7)係提供於該安裝部u 上。該凹槽14及該支座15經構形及配置使得一間隔物51 (見圖8)能接觸該支座15。在一較佳實施例中，該凹槽丨斗及 該支座15圍繞該安裝開口 12實質上圓形地延伸。該間隔物 51被提供於該曲柄軸50上。 此外，圖2顯示一凹口 21。該凹口 21被提供於該曲柄基 部20内並貫質上在該曲柄臂1〇之縱向a中延伸。該凹口 21 在該曲柄基部20内提供一中空空間◊較佳的是，該中空空 間為如圖5及圖6所顯示的封閉中空空間。換言之，該曲柄 基部20實質上對應於一矩形中空輪廓（「Rechteck-Hohlprofil」）。換言之’該曲柄基部20以一種中空輪廓形 M384153 狀形成旦特別是一種矩形中空輪廓形狀。因此，該曲柄臂 =之重量與—種具有實心輪廓的曲柄臂相比可被最小化。 然而，該曲柄臂10仍為強且硬。當然，若有需要或想要 時’可不用凹口 21。 一圖3為圖1所顯示的自行車曲柄臂10之-側視圖。圖3顯 :b第及第二自由端10,、10,，、安裝部η、該等凹口 13 者凹槽丨4、曲柄基部20及腳踏板附接部30。 圖4為圖1所顯示的自行車曲柄臂10之一前視圖。圖4顯 示該第—Τ, ** 弟二自由端10’、10，，、安裝部u、安裝開口 12曲柄基部2〇及腳踏板附接部30。 圖為圖1所顯示的自行車曲柄臂i 〇沿著圖3之直線D_D， 所示的截面圖。 圖為圖1所顯示的自行車曲柄臂10沿著圖3之直線E-E1 的截面圖。圖5及圖ό特別是該曲柄基部2〇之截面圖， 其以截面顯示該實質上矩形中空輪廓。 _ 為圖1所顯示的自行車曲柄臂10沿著圖4之直線F-F，所 不的截面圖。圖7特別是該安裝部11(第一自由端10·)之一 截面圖，复 gg — J.». VV. 04- 〇„ ^頌不s玄女裝開口 12、該等凹口 13、該凹槽14及 該支座15。 圖8為圖1所顯示的被附接至一曲柄軸50並與一習知的滑 f移除工具60接合的自行車曲柄臂10之一截面圖。參考數 2 52顯不—習知軸承，參考數字53顯示一習知轴承外殼， >考數子55顯示習知前鏈輪，且參考數字60顯示一習知滑 移除"且^ '、”。因此’軸承52、轴承外殼53、該等前鏈輪5 5 (緊固至一去_ 不顯示的右曲柄臂）及該滑輪移除工具以及圖8所 M384153 顯示的其他部件為技術中熟知的習知部件（因此此等纽件 ： 未被詳細描述於此），除了該自行車曲柄臂丨〇及該間隔物 5 1 〇 圖9為該曲柄臂1〇之一放大透視圖，特別是顯示凹口 13二如圖9所詳細顯示，凹口 13包含—相對於該安裝開口 12只質上徑向延伸的實質平坦表面，特別是該表面相對於 該女裝開口 12之中心軸形成一銳角，使得用於移除該自行. 車曲柄臂10的工具在施加一張力於該安裝部u上時不易自 其滑開，該凹口13具有一開口及一底部。較佳的係該凹口 ·φ 13之開口，更特別是該凹口 13之所有角具有圓角且該凹口 13之底部為實質上平坦之表面，特別是實質平行於該安裝 開口之切線延伸。 如前面所提到，該安裝部U，特別是該安裝開口 12被壓 入配合於該曲柄軸50上。為從該曲柄軸5〇移除該曲柄臂 10，可使用該習知滑輪移除工具60代替一種專用曲柄移除 工具。 如圖8所顯示，該滑輪移除工具6〇包含兩個臂61及一具 · 有一外螺紋的軸63，該等兩個臂61之各者具有一向内突出 的突起物62。該等凹口 13經構形及配置以便與該等突起物 62接合。該軸63之一軸向端64經構形及配置以便與該曲柄 轴50之一軸向端54接合。在該等轴向端“及以之間的接觸 在從該曲柄軸50移除該曲柄臂1〇時充當一支座。轉動把手 64造成該等兩個臂61移動進入圖8的方向並由此將曲柄 臂10從曲柄轴50移除。如可從圖8看到，在從該曲柄轴5〇 •10· M384153 移除該曲柄臂10時只在圖8之方向B中發生一縱向力 =力將提供一種簡單且平滑的移除。由於該凹口 Η包‘實 貝上平坦之表面’其相對於該安裝開口】2實質上徑向延伸 並相對於該安裝開口 12之中心軸形成一銳角，故用於移除 該自行車曲柄臂1〇的工具6〇在移除時不易於從該安裝和 滑開。換言之，該等兩個臂61在施加一張力於該安裝部^ 亡’即在移除該曲柄臂1〇時不易於移動進入方向c中，而 是仍保持與該安裝部〗〗的緊固接合。 _ 5^只選擇所選定的實施例以說明本創作，但基於此揭 7Γ内奋對於技術料者來說顯而易見的係多種改變及修改 可被製成而不脫離在隨附請求項中所界定的本創作:範 =ο此外’根據本創作的該等實施例之前文僅具說明性， :目的不在於限制由隨附請求項及其等效物所界定的本創 。因此，本創作之範圍不限於所揭示的該等實施例。 【圖式簡單說明】 圖1為—種根據本創作之—較佳實施例的自行車曲柄臂 之一後視圖； 所 圖2為圖1所顯示的自行車曲柄臂沿著圖4之直線Α_Αι 不的截面圖； 圖3為圖i所顯示的自行車曲柄臂之—側視圖，· 圖4為圖1所顯示的自行車曲相臂之-前視圖； 圖5為圖1所顯示的自行車曲柄臂沿著圖3之直線D-D|所 示的戴面圖； 圖6為圖1所顯示的自行車曲柄臂沿著圖3之直線諸所 示的截面圖； 圖7為圖1所顯示的自行車曲 的戴面圖； 柄“者圖4之直線F-F，所矛 圖8為圖1所顯示的被附接至— 曲柄軸並與一種習知的淨 輪移除工具接合的自行車曲柄臂之一截面圖；及 圖9為圖i所顯示的自行車曲柄臂之'縱向端的放大透韻 圖。 【主要元件符號說明】 10 左曲柄臂 10, 第一自由端 10" 第二自由端 11 安裝部 12 安裝開口 13 凹口 14 凹槽 15 支座 20 曲柄基部 21 中空空間 30 腳踏板安裝部 50 曲柄軸 51 間隔物 52 轴承 53 袖承外殼 54 軸向端In a preferred embodiment, the mounting portion includes a recess (notch) and a seat. The phase slot and the support are configured and configured such that a spacer provided on the crankshaft can contact the mount. Preferably, the recess and/or the support extend around the mounting opening. In a preferred embodiment, the bicycle crank arm includes a crank base extending between the mounting portion and the foot pedal attachment portion. The crank base has a hollow space therein such that the crank base is provided as a hollow profile. In the preferred embodiment, the mounting portion is a substantially circular through 孑L* 〇6 bicycle crank that can be formed and modified in the manner described above, and the features and features can be combined with each other in any manner. The above-mentioned implementations, such as the detailed description, reveal that the present invention, which is the preferred embodiment of the present invention, will become the same as the other (4), features and advantages of the present invention: Obvious. [Embodiment] The selected embodiment of the present invention will be described with reference to the drawings. The following description of the embodiments of the present invention, which is obvious to those skilled in the art, is provided for illustration only, and is not intended to limit the scope of the claims and their equivalents. This creation. One of the bicycles, the crank assembly, basically comprises a right crank arm, a left crank arm, a crank shaft, one or more false sprocket wheels, and a pair of pedals. Typically the right crank arm has one or more sprocket coupled to the right crank arm. The right crank arm, the crank axle, the one or more sprockets, and the pair of foot pedals are preferably conventional components well known in the art. Therefore, this component will not be described in detail herein. Referring first to Figure 1, a left crank arm 10 in accordance with one embodiment of the present invention is illustrated. The crank arm 1A includes a first free end 10, (inner free end) and a second free end (outer free end). The crank arm 10 includes a mounting portion 11, a pedal attachment portion 30, and a crank base 20. The mounting portion 11 is disposed on the first free end 10' and the foot pedal attachment portion 30 is disposed on the second free end 10". The crank base 20 extends between the first free end 1〇 and the second free end 10". The dressing portion 11 includes a mounting opening 12 which preferably has a substantially circular shape. The mounting portion U (particularly the mounting opening 12) is configured and configured to be non-rotatably slidably coupled to the crankshaft 50 (see Figure 8) in a desired fit. One of the inner circumferential faces of the mounting opening u has a wrong tooth notch. The serrated notches serve to non-rotatably engage the mating serration notches provided on one of the outer circumferential faces of the crank shaft 50. Preferably, the footboard attachment portion 30 includes an opening threaded to securely couple the shaft of the foot pedal (not shown) to the footboard attachment portion 3'' in a conventional manner. The crank arm 10 further includes at least one notch 13 provided on the first free end 10'. The at least one recess is provided in an outer surface that extends circumferentially relative to the mounting opening 12. In the embodiment shown in Figure i, two notches 13 are provided. The two recesses 13 are provided adjacent to the mounting opening 12, i.e., adjacent the mounting opening 12. These notches. Preferably, the system is disposed on the opposite side of the mounting opening 12. Preferably, the notches 13 are symmetrically aligned with respect to one of the longitudinal axes A of the crank arms 1 (see line A of Figure i) and/or symmetrically with respect to the center of the crank opening 12. More preferably, the notches 13 extend substantially parallel to the longitudinal axis of the crank arm 1〇. Therefore, when the crank arm 1 is removed from the crankshaft 50, only a longitudinal force is generated in the direction B of Fig. 8, which will provide a simple and smooth removal. Alternatively, a plurality of separate recesses may be provided at least partially around the mounting portion 11 to specifically surround the mounting opening 12. Alternatively, a single recess extending around the mounting portion 11 may be provided, particularly around the mounting opening 12. The two recesses 13 shown in Figure 1 are configured and arranged to engage a conventional moon wheel removal tool (see Figure 8) to provide a bicycle crank arm i on the mounting opening of the bicycle crank arm - Threaded part, interface - special crank removal tool. Therefore, the mounting opening: a non-threaded mounting opening. In other words, the inner surface of the mounting opening σ12 does not have the function of engaging the thread of the special crank removing tool for removing the bicycle crank (four). An existing pulley removal tool (see Fig. 8) can be used as a tool for removing the crank arm 10 from the crankshaft 5〇. Therefore, the bicycle crank arm 1 has a simpler construction and a more compact mounting portion U than the conventional bicycle crank arm. Figure 2 is a cross-sectional view of the crank arm 1 图 shown in Figure 1 taken along line A &&; of Figure 4; 2 illustrates first and second free ends 1〇, 1〇,, mounting portion U, mounting opening 12, a groove 14 preferably provided on the first free end 1〇, crank base 20 And the pedal attachment portion 3〇. The groove 14 is provided on the mounting portion 11. In addition, a seat 15 (see Fig. 7) is provided on the mounting portion u. The recess 14 and the support 15 are configured and arranged such that a spacer 51 (see FIG. 8) can contact the mount 15. In a preferred embodiment, the groove bucket and the support 15 extend substantially circularly about the mounting opening 12. The spacer 51 is provided on the crank shaft 50. Further, Fig. 2 shows a notch 21. The recess 21 is provided in the crank base 20 and extends in the longitudinal direction a of the crank arm 1〇. The recess 21 provides a hollow space within the crank base 20. Preferably, the hollow space is a closed hollow space as shown in Figures 5 and 6. In other words, the crank base 20 substantially corresponds to a rectangular hollow profile ("Rechteck-Hohlprofil"). In other words, the crank base 20 is formed in a hollow contour shape M384153, in particular a rectangular hollow contour shape. Therefore, the weight of the crank arm = can be minimized compared to a crank arm having a solid contour. However, the crank arm 10 is still strong and hard. Of course, the notch 21 can be used if needed or desired. Figure 3 is a side view of the bicycle crank arm 10 shown in Figure 1. Figure 3 shows the b and second free ends 10, 10, the mounting portion η, the recesses 13, the groove 丨 4, the crank base 20 and the footrest attachment portion 30. 4 is a front elevational view of one of the bicycle crank arms 10 shown in FIG. Fig. 4 shows the first Τ, ** two free ends 10', 10, the mounting portion u, the mounting opening 12, the crank base 2 〇 and the footrest attachment portion 30. Figure 1 is a cross-sectional view of the bicycle crank arm i 图 shown in Figure 1 along the line D_D of Figure 3 . Figure 1 is a cross-sectional view of the bicycle crank arm 10 shown in Figure 1 taken along line E-E1 of Figure 3. Fig. 5 and Fig. 5 are, in particular, cross-sectional views of the crank base 2'', which show the substantially rectangular hollow profile in cross section. _ is a cross-sectional view of the bicycle crank arm 10 shown in Fig. 1 along the line F-F of Fig. 4. Figure 7 is a cross-sectional view of the mounting portion 11 (first free end 10·), in particular, gg — J.». VV. 04- 〇„ ^颂不s玄玄 Opening 12, the notches 13, The recess 14 and the mount 15. Figure 8 is a cross-sectional view of the bicycle crank arm 10 shown in Figure 1 attached to a crankshaft 50 and engaged with a conventional slip f removal tool 60. The number 2 52 is not known - the conventional bearing, reference numeral 53 shows a conventional bearing housing, > the test 55 shows the conventional front sprocket, and reference numeral 60 shows a conventional slip removal " and ^ ', ". Thus 'bearing 52, bearing housing 53, these front sprocket 5 5 (fastened to a right crank arm not shown) and the pulley removal tool and other components shown in Figure 8 of M384153 are well known in the art. A conventional component (and thus such a member: not described in detail herein), except for the bicycle crank arm and the spacer 5 1 〇 FIG. 9 is an enlarged perspective view of the crank arm 1 ,, particularly showing a concave The mouth 13 is shown in detail in FIG. 9. The recess 13 includes a substantially flat surface extending radially with respect to the mounting opening 12, in particular the surface forming an acute angle with respect to the central axis of the women's opening 12. The tool for removing the self-propelled crank arm 10 is not easily slidable when a force is applied to the mounting portion u, the recess 13 having an opening and a bottom. Preferably, the opening of the recess φ 13 , more particularly all corners of the recess 13 have rounded corners and the bottom of the recess 13 is a substantially flat surface, in particular substantially tangent to the mounting opening. extend. As mentioned previously, the mounting portion U, and in particular the mounting opening 12, is press fit onto the crank axle 50. To remove the crank arm 10 from the crank axle 5, the conventional pulley removal tool 60 can be used in place of a dedicated crank removal tool. As shown in Fig. 8, the pulley removing tool 6A includes two arms 61 and a shaft 63 having an external thread, each of which has an inwardly projecting projection 62. The recesses 13 are configured and arranged to engage the projections 62. One of the axial ends 64 of the shaft 63 is configured and configured to engage an axial end 54 of the crankshaft 50. The "and" contact at the axial ends acts as a seat when the crank arm 1 is removed from the crankshaft 50. Rotating the handle 64 causes the two arms 61 to move into the direction of Figure 8 and This removes the crank arm 10 from the crankshaft 50. As can be seen from Figure 8, a longitudinal force occurs only in the direction B of Figure 8 when the crank arm 10 is removed from the crankshaft 5〇•10·M384153 The force will provide a simple and smooth removal. Since the notched pocket 'the flat surface on the shell' is relative to the mounting opening 2, it extends substantially radially and is formed relative to the central axis of the mounting opening 12. An acute angle, so that the tool 6 for removing the bicycle crank arm 1〇 is not easily attached and slid away from the removal. In other words, the two arms 61 are applying a force to the mounting portion. That is, when the crank arm 1〇 is removed, it is not easy to move into the entering direction c, but still maintain the fastening engagement with the mounting portion. _ 5^ Only selected embodiments are selected to illustrate the creation, but based on It is obvious that many changes and modifications can be made to the technical material. Without departing from the present invention as defined in the accompanying claims: Fan = ο further 'The embodiments according to this creation are previously illustrative only, and are not intended to limit the claims and their equivalents. The present invention is not limited to the disclosed embodiments. [FIG. 1] FIG. 1 is a rear view of a bicycle crank arm according to a preferred embodiment of the present invention. 2 is a cross-sectional view of the bicycle crank arm shown in FIG. 1 along the line Α Α Α ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; Figure 5 is a perspective view of the bicycle crank arm shown in Figure 1 along the line DD| of Figure 3; Figure 6 is a bicycle crank arm shown in Figure 1 along Figure 3 Figure 7 is a front view of the bicycle music shown in Figure 1; the handle "the straight line FF of Figure 4, the spear 8 is attached to the crankshaft shown in Figure 1" And a cross-sectional view of a bicycle crank arm engaged with a conventional net wheel removal tool; and FIG 9 is i 'longitudinal ends enlarged perspective of the bicycle crank arm rhyme displayed. [Main component symbol description] 10 Left crank arm 10, first free end 10" Second free end 11 Mounting portion 12 Mounting opening 13 Notch 14 Groove 15 Support 20 Crank base 21 Hollow space 30 Foot pedal mounting portion 50 Crankshaft 51 spacer 52 bearing 53 sleeve housing 54 axial end
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55 前鏈輪 60 滑輪移除工具 61 臂 62 突起物 63 軸 64 軸向端 A 縱軸 B 方向 C 方向55 Front sprocket 60 Pulley removal tool 61 Arm 62 Projection 63 Shaft 64 Axial end A Vertical axis B Direction C Direction
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