200909246 九、發明說明： 【發明所屬之技術領域】 本發明與自行車有關，特別是有關於一種自行車輪 毅總成。 5【先前技術】 中華民國公告編號第1252815號專利案揭露出一種外 I爪式棘輪花轂(以下各元件符號以此專利案為主），包含有 一心軸單元（10)、一可旋轉地設於心軸單元（1〇)之殼體 (20)、一設於殼體(2〇)内部之離合單元(3〇)與— 一端之鏈輪座（40)。殼體(20)之内環面具有複數容置槽 (23);離合單元(3〇)具有一棘齒環(31)與複數掣爪(32)，其中 ^齒環(31)套設於心軸單元(10)且與鏈輪座(4〇)連接，棘齒 裱(31)之齒槽沿著棘齒環(31)的切線方向凹陷而成，各掣爪 (32)設於各容置槽(23)且與棘齒環(31)之齒槽嚙合。口 15 田鏈輪座(40)以正向（此專利案之第四圖的順時鐘方向） 轉動時，會透過棘齒環(31)之齒槽槽壁推抵各掣爪(32)，使 各掣爪(32)帶動殼體(2〇)轉動，而當鏈輪座(4〇)以反向（此專 利案之第四圖的逆時鐘方向）轉動時，棘齒環(31)之齒槽將 不會推抵各掣爪(32)而使棘齒環(31)產生空轉。 20 然而，鏈輪座(4〇)的裝設方向有時會為了因應某些特殊 的車款的需求或使用者的騎乘習慣而改變，例如有些使用 者習慣將鏈輪座(4〇)裝設於右方，有些使用者則習慣將鏈輪 座(4〇)裝設於左方，如此一來，殼體(2〇)與棘齒環(31)也就 必須隨之改變組裝方向。但是棘齒環(31)之齒槽具有一定的 4 200909246 方向性，若直接改變組裝方向，將造成各掣爪(32)無法與棘 齒環(31)之齒槽嚙合而無法順利帶動殼體(2〇)轉動，亦即鏈 輪座(40)會產生空轉，因此必須製作出具有另一方向齒槽的 棘齒環來配合使用者使用，但是此種作法除了會提高^造 5成本而不符經濟效益之外，更會造成使用者的不便。 【發明内容】 本么月之主要目的在於提供一種自行車輪較總成， 動可同的使用需求而變換成左側驅動或右側驅 動，用以增加使用上的便利性。 其可供—種自行車輪穀總成， 衣化成本而提尚經濟效益。 15 20 含有t輪數;、二棘 的本發明所提供之自行車輪數總成包 輪穀具有-輛孔與輪二棘爪與-彈性件。該 於該軸孔定羲出二 设於該軸孔之心軸，且該輪轂 軸且定義出一外環面裱:；該棘輪同軸套設於該輪轂之心 面，該棘輪之外‘面鱼=棘輪之外環面對應該輪轂之内環 ㈣槽，各該齒槽沿該=叫面的其中之-具有複 之外環面與該輪浐：之軸孔徑向凹陷而成，該棘輪 棘爪設於該容置―二，的另外之-具有-容置槽；該 件設於該容置槽的另一媳：f其中-該齒槽嚙合；該彈性 回復之力量。 、’氏頊該棘爪，用以提供該棘爪 性件的位置互相交換 200909246 ^皆可與該齒槽嗜合而由帶動該輪轂轉動，用以增加使 的便利性，並可有效降低製造成本而提高經濟效益。 【實施方式】 5 '為了詳細說明本發明之結構、特徵及功效所在，茲舉 以下較佳實施例並配合圖式說明如後，其中： 第一圖為本發明第一較佳實施例之立體組合圖； 第二圖為本發明第一較佳實施例之立體分解圖； 1〇 f二圖為本發明第一較佳實施例之平面局部剖視圖； 10 第四圖為第三圊沿4_4剖線之剖視圖，主要顯示棘爪與 輪穀之齒槽嚙合之狀態； 〃 第五圖類同於第四圖，主要顯示棘爪及彈性件交換位 置後與輪轂之齒槽嚙合之狀態； 第六圖為本發明第二較佳實施例之立體分解圖；以及 第七圖為本發明第二較佳實施例之剖視示意圖，主要 顯示棘爪與棘輪之齒槽p齒合之狀態。 5月參閱第一圖與第二圖，為本發明一較佳實施例所提 供之自行車輪穀總成(1) ’自行車輪轂總成(1)包含有一輪轂 (2)、一棘輪(3)、三棘爪(4)、三彈性件(5)、一軸環(6)、一 20墊圈(7)與一螺桿⑻。 輪轂(2)具有一軸孔(21)與一同轴穿設於軸孔(21)之心 輪(22) ’其中心軸(22)的内周面具有一螺紋段(221)。輪轂(2) 於軸孔(21)定義出一内環面(23) ’在本實施例中，輪轂(2) 具有一驅動環(24)，驅動環(24)之外環面固設於軸孔(21)孔 200909246 J，使驅動ί々(24)之内環面形成輪穀⑺之内環面⑼。驅動 環(24)之内環面具有複數沿輪轂(2)之軸孔(21)徑向凹陷形 成之齒槽(25)與複數形成於二相鄰齒槽(25)間之凸塊(％)， 如第四圖所不。各齒槽(25)與各凸塊(26)皆呈等間隔排列， 5且各齒槽(25)與各凸塊(26)的斷面形狀皆概呈梯形。 棘輪(3)具有一鏈輪座(31)，用以供一鏈條（圖中未示） 嚙合，使鏈輪座(31)可透過鏈條而帶動棘輪(3)轉動。棘輪(3〇) 另具有一連接鏈輪座(31)之環垣(33)，在本實施例中，環垣 (33)之外環面形成棘輪(3)之外環面(32)，環垣(33)之外環面 ίο (33)具有二等間隔分布之容置槽(34)，各容置槽(34)的兩端 分別具有一弧狀之凹部(342 ’ 344)，如第四圖所示，各容置 槽(34)之凹部(342，344)相互對稱。棘輪(3)同軸地套設於輪 轂(2)之心軸(22)而使棘輪(3〇)之環垣(33)穿設於輪轂(2)之 軸孔(21)中，如第三圖所示，環垣(33)之外環面(32)則對應 15 驅動環(24)之内環面(23)。 棘爪(4)具有一樞轉端(42)與一齒端(44)。棘爪(4)之樞轉 端(42)可選擇性地裝設於棘輪(3)之容置槽(34)的其中一凹 部(342，344)，在本實施例中是裝設於凹部(342)中，使棘 爪(4)可以樞轉端(42)為軸心而上下偏擺。棘爪(4)之齒端(44) 2〇則可嵌入輪轂(2)之其中一齒槽(25)中’並推抵齒槽(25)之槽 壁，使輪轂(2)可受棘爪(4)之齒端(44)的作用力而轉動。 彈性件(5)的一端經彎折而可選擇性地裝設於棘輪(3) 之容置槽(34)的其中一凹部(342，344) ’在本實施例是裝設 於凹部(344)中，另一端則抵頂棘爪(4)之齒端(44)，用以提 7 200909246 供棘爪(4)之齒端(44)回復之力量。 軸環⑹套設於輪穀(2)之心軸㈤，並頂抵棘輪⑶之鍵 輪座⑼，用以將棘輪⑽之環垣(33)固定於輪穀抽孔 (21)中。 5 _(7)套設於輪穀(2)之心軸(22)，並頂抵轴環⑹之外 側面。 螺桿⑻螺接於輪數⑺之心轴(22)的螺紋段⑽），並頂 抵軸環⑹之外側面，用以將棘輪(3)與輪轂(2)固定在一起。 經由以上結構，請同時配合參閱習用專利案的第四圖 1〇與本發明第四圖。在本發明的第四圖中，當輪穀⑺之轴孔 ()朝向右方且鏈條，動鏈輪座(31)以正向（第四圖中的順 日f童方向)轉動時’將同步帶動棘輪⑶與棘爪(4)轉動，此 %，棘爪(4)之齒端（44)會推抵輪轂（2)之齒槽（25)槽壁 (252) ’使輪轂(2)受到棘爪⑷之齒端㈣的推力而同步轉 15動三而在習用專利案中，當鍵輪座㈣以正向（習用專利案 之第四圖的順時鐘方向)轉動時，會透過棘齒環⑼之齒槽 才曰土推抵各掣爪(32) ’使各掣爪⑽帶動殼體⑽轉動。 *相反的’當鏈條以反向(本發明之第四圖的逆時鐘方向） ίγ動鏈輪座(31)轉動時’棘爪⑷之齒端㈣會被相鄰二齒槽 2〇 (25)間的凸塊(26)給壓抵而離開齒槽⑽，使棘輪⑺無法透 j棘爪(5〇)之齒端(4句與輪毅⑺之齒槽⑽的喃合而帶動輪 轂⑺轉動’並同時產生空轉。當棘輪⑶停止空轉時，各彈 f·生件(5) 3利用本身的彈力推抵棘爪⑷之齒端(44)，棘爪(4) 之ωί^(44)即可再肷入輪轂(2)之其中一齒槽(25)中。而在習 200909246 H利案中，虽鏈輪座(40)以反向（此專利案之第四圖的逆 時鐘方向)轉動時，棘齒環(31)之齒槽將不會推抵各擎爪(3 2) 而使棘齒環(31)產生空轉。 月再> 閱‘用專利案第四圖與本發明之第五圖，若使 5 1者將，穀(2)轉換方向’讓輪敕⑺之轴孔⑵)朝向左方 牯’此化’使用者必須分別將各棘爪(4)與各彈性件(5)交換 位置’亦即將各棘爪(4)裝設於各凹部(344)中，各彈性件(5) 則裝設於各凹部(342)中，如第五圖所*，如此一來，當棘 輪(3)以正向（第五圖中的逆時鐘方向)轉動時，棘爪⑷之齒 1〇端(44)則推抵輪穀(2)之齒槽(25)相對側的槽壁(254)而帶動 輪轂⑺轉動。同樣的，當棘輪⑶以反向（第五圖中的順時鐘 方向)轉動日可’棘輪(3)會產生空轉而無法帶動輪穀⑺轉動。 而若將習用專利案的鏈輪座⑽轉換方向並以正耐習 利ΐ之第四圖的逆時鐘方向)轉動時，各掣爪(32)無法與棘 齒板(31)之齒槽嗜合而無法順利帶動殼體⑽轉動，亦 輪座(40)會產生空轉。 … 十私d馮用聆系些特殊車款或因應使用者 ，求而變換輪轂的方_，透過齒槽的梯形斷面以及棘爪 與f生件可拆換的設計，讓棘輪可配合純的方向而驅動 輪叙轉動’並不需要再製造出相配合的齒槽，用以有 低製造成本且提1¾經濟效益。 請參閱第六圖’為本發明第二較佳實施例所提供 行車輪轂麟(9)，Μ要結構與上述實 其不同在於： ^ 20 200909246 请配合參閱第七圖’輪轂(91)之軸孔(912)孔壁設有環 垣(92)，使環垣(92)之内環面形成輪轂(91)之内環面(914)而 具有容置槽(916)，用以供彈性件(93)與棘爪(94)裝設。驅動 環(95)則固設於棘輪(96)之鏈輪座(97)，使驅動環(95)之外環 面形成棘輪(％)之外環面(962)而具有齒槽(964)。藉此，當 棘輪(96)轉動時，則是透過驅動環(95)之齒槽(964)槽壁來推200909246 IX. INSTRUCTIONS: TECHNICAL FIELD OF THE INVENTION The present invention relates to bicycles, and more particularly to a bicycle wheel assembly. 5 [Prior Art] The Patent Case No. 1252815 of the Republic of China discloses an external I-claw ratchet hub (the following components are mainly based on this patent), including a spindle unit (10) and a rotatable ground. A housing (20) disposed on the spindle unit (1), a clutch unit (3〇) disposed inside the housing (2〇), and a sprocket seat (40) at one end. The inner ring surface of the casing (20) has a plurality of accommodating grooves (23); the clutch unit (3 〇) has a ratchet ring (31) and a plurality of claws (32), wherein the ring gear (31) is sleeved on The spindle unit (10) is connected to the sprocket seat (4〇), and the tooth groove of the ratchet (31) is recessed along the tangential direction of the ratchet ring (31), and each claw (32) is disposed at each The groove (23) is accommodated and meshed with the tooth groove of the ratchet ring (31). When the mouth 15 sprocket seat (40) is rotated in the forward direction (the clockwise direction of the fourth figure of this patent), it will push against the claws (32) through the slotted groove wall of the ratchet ring (31). The jaws (32) are caused to rotate the housing (2〇), and when the sprocket seat (4〇) is rotated in the reverse direction (the counterclockwise direction of the fourth figure of this patent), the ratchet ring (31) The cogging will not push against each of the jaws (32) and cause the ratchet ring (31) to idle. 20 However, the direction of the sprocket seat (4〇) is sometimes changed to meet the needs of certain special models or the user's riding habits. For example, some users are used to the sprocket seat (4〇). Installed on the right side, some users are accustomed to mounting the sprocket seat (4〇) to the left, so that the housing (2〇) and the ratchet ring (31) must change the assembly direction. . However, the tooth groove of the ratchet ring (31) has a certain 4 200909246 directivity. If the assembly direction is directly changed, the claws (32) cannot be engaged with the tooth grooves of the ratchet ring (31) and the housing cannot be smoothly driven. (2〇) rotation, that is, the sprocket seat (40) will produce idling, so it is necessary to make a ratchet ring with a tooth groove in the other direction to cooperate with the user, but this method will not only increase the cost of manufacturing 5 In addition to economic benefits, it will cause inconvenience to users. SUMMARY OF THE INVENTION The main purpose of this month is to provide a bicycle wheel assembly that can be converted into a left side drive or a right side drive for the same use requirement, thereby increasing the convenience of use. It can be used as a kind of bicycle wheel valley assembly, which is economical and cost-effective. 15 20 The bicycle wheel number assembly package provided by the present invention having the number of t wheels; and the two spines has a hole and a wheel 2 pawl and an elastic member. The shaft hole defines a mandrel disposed on the shaft hole, and the hub shaft defines an outer ring surface: the ratchet is coaxially disposed on the heart surface of the hub, and the ratchet is outside the fish surface. The outer ring of the ratchet faces the inner ring (four) groove of the hub, and each of the tooth grooves is formed by a radial outer groove of the outer ring surface and the rim of the rim: the ratchet pawl The other one of the accommodating-seconds has a receiving groove; the piece is disposed on the other side of the accommodating groove: f-the cogging is engaged; the elastic recovery force. The pawl is used to provide the position of the pawl member to exchange 200909246. Both can be coupled with the tooth groove to drive the hub to rotate, for convenience and to effectively reduce manufacturing. Cost and increase economic efficiency. [Embodiment] 5' is a detailed description of the structure, features and effects of the present invention. The following is a description of the preferred embodiment and the accompanying drawings. 2 is an exploded perspective view of a first preferred embodiment of the present invention; 1 〇 f is a plan partial cross-sectional view of a first preferred embodiment of the present invention; 10 is a third cross section taken at 4_4 The cross-sectional view of the line mainly shows the state in which the pawl engages with the tooth groove of the wheel valley; 第五 The fifth figure is similar to the fourth figure, mainly showing the state in which the pawl and the elastic member are engaged with the tooth groove of the hub after the exchange position; 2 is an exploded perspective view of a second preferred embodiment of the present invention; and a seventh cross-sectional view showing a second preferred embodiment of the present invention, showing a state in which the pawl is coupled to the cogging p of the ratchet. Referring to FIG. 1 and FIG. 2 for a bicycle wheel valley assembly (1) according to a preferred embodiment of the present invention, a bicycle hub assembly (1) includes a hub (2) and a ratchet (3). , three pawls (4), three elastic members (5), a collar (6), a 20 washer (7) and a screw (8). The hub (2) has a shaft hole (21) and a core portion (22) coaxially disposed through the shaft hole (21). The inner circumference of the central shaft (22) has a threaded section (221). The hub (2) defines an inner annular surface (23) in the shaft hole (21). In the embodiment, the hub (2) has a driving ring (24), and the outer ring surface of the driving ring (24) is fixed to The shaft hole (21) hole is 200909246 J, so that the inner ring surface of the drive 々 (24) forms the inner ring surface (9) of the valley (7). The inner ring surface of the driving ring (24) has a plurality of slots (25) formed by radial recesses along the shaft holes (21) of the hub (2) and a plurality of bumps formed between the two adjacent slots (25) (%) ), as shown in the fourth picture. Each of the slots (25) and each of the bumps (26) are arranged at equal intervals, and each of the slots (25) and the bumps (26) have a trapezoidal shape. The ratchet (3) has a sprocket seat (31) for engaging a chain (not shown) such that the sprocket seat (31) can drive the ratchet (3) to rotate through the chain. The ratchet wheel (3〇) has a ring cymbal (33) connecting the sprocket seat (31). In this embodiment, the outer ring surface of the ring cymbal (33) forms an outer ring surface (32) of the ratchet wheel (3). The outer ring surface of the ring 33 (33) has a accommodating groove (34) with a second interval, and each end of each accommodating groove (34) has an arc-shaped recess (342 ' 344), such as As shown in the fourth figure, the recesses (342, 344) of the respective receiving grooves (34) are symmetrical to each other. The ratchet (3) is coaxially sleeved on the spindle (22) of the hub (2), and the ring (33) of the ratchet (3) is inserted into the shaft hole (21) of the hub (2), such as the third As shown in the figure, the outer ring surface (32) of the ring (33) corresponds to the inner ring surface (23) of the 15 drive ring (24). The pawl (4) has a pivot end (42) and a tooth end (44). The pivoting end (42) of the pawl (4) is selectively mounted to one of the recesses (342, 344) of the receiving groove (34) of the ratchet (3), which is mounted in the recess in this embodiment. In (342), the pawl (4) can be pivoted up and down with the pivoting end (42) as the axis. The tooth end (44) of the pawl (4) can be inserted into one of the slots (25) of the hub (2) and pushes against the groove wall of the slot (25), so that the hub (2) can be subjected to the spine The force of the tooth end (44) of the claw (4) rotates. One end of the elastic member (5) is selectively attached to one of the recesses (342, 344) of the receiving groove (34) of the ratchet (3). In this embodiment, it is mounted in the recess (344). The other end is against the tooth end (44) of the top pawl (4) for raising the force of the return of the tooth end (44) of the pawl (4) of 200909246. The collar (6) is sleeved on the mandrel (5) of the wheel valley (2) and abuts against the key wheel seat (9) of the ratchet (3) for fixing the ring (33) of the ratchet (10) in the wheel hole (21). 5 _(7) Set on the mandrel (22) of the wheel valley (2) and abut against the outside of the collar (6). The screw (8) is screwed to the threaded section (10) of the mandrel (22) of the number of wheels (7) and abuts against the outer side of the collar (6) for securing the ratchet (3) to the hub (2). Through the above structure, please refer to the fourth drawing of the conventional patent and the fourth drawing of the present invention. In the fourth diagram of the present invention, when the shaft hole () of the trough (7) is directed to the right and the chain, the moving sprocket seat (31) is rotated in the forward direction (the direction of the child in the fourth figure) Synchronously driving the ratchet (3) and the pawl (4) to rotate, the %, the tooth end (44) of the pawl (4) will push against the slot (25) of the hub (2) (252) 'to make the hub (2) In the conventional patent case, when the key wheel base (4) is rotated in the forward direction (the clockwise direction of the fourth figure of the patent application case), the spine (4) is rotated by the thrust of the tooth end (4) of the pawl (4). The tooth grooves of the ring gear (9) push the soil against the respective claws (32) 'to cause the respective claws (10) to drive the housing (10) to rotate. *Inverted 'When the chain is reversed (the counterclockwise direction of the fourth figure of the present invention) ίγ moving the sprocket seat (31) when rotating, the 'tooth end (4) of the pawl (4) will be adjacent to the second two slots 2 (25 The bump (26) is pressed against the tooth groove (10), so that the ratchet (7) cannot penetrate the tooth end of the j pawl (5〇) (the four-segment and the tooth groove (10) of the wheel (7) drive the hub (7) Rotate 'and idling at the same time. When the ratchet (3) stops idling, each bf (3) 3 uses its own elastic force to push against the tooth end (44) of the pawl (4), the ωί^ of the pawl (4) 44) It can be inserted into one of the slots (25) of the hub (2). In the case of the 200909246 H case, the sprocket seat (40) is reversed (the inverse of the fourth figure of this patent) When the clock direction is rotated, the tooth groove of the ratchet ring (31) will not push against the claws (3 2) and the ratchet ring (31) will be idling. Month again > With the fifth figure of the present invention, if the 5 1 is to be, the valley (2) is switched in the direction of 'the shaft hole (2) of the rim (7)) toward the left side, and the user must separately place each pawl (4). Interchanging the position with each elastic member (5), that is, installing each pawl (4) in each recess (344), The elastic member (5) is installed in each recess (342) as shown in the fifth figure, so that when the ratchet (3) is rotated in the forward direction (counterclockwise direction in the fifth figure), the pawl (4) The tooth 1 end (44) pushes against the groove wall (254) on the opposite side of the tooth groove (25) of the wheel valley (2) to drive the hub (7) to rotate. Similarly, when the ratchet (3) is rotated in the reverse direction (clockwise direction in the fifth figure), the ratchet (3) will be idling and will not be able to drive the wheel (7) to rotate. However, if the sprocket seat (10) of the conventional patent is rotated and rotated in the counterclockwise direction of the fourth diagram of the positive resistance, the claws (32) cannot be attached to the spur of the ratchet plate (31). In combination, the casing (10) cannot be smoothly rotated, and the wheel base (40) is idling. ... Ten private d Feng used to listen to some special models or to change the wheel's side according to the user's request, through the trapezoidal section of the tooth groove and the design of the pawl and the f-piece can be replaced, so that the ratchet can be matched with pure The direction of driving the wheel rotation ' does not require the production of matching cogging for low manufacturing costs and economic benefits. Please refer to the sixth figure, which is a second embodiment of the present invention. The main structure of the wheel hub (9) is different from the above: ^ 20 200909246 Please refer to the seventh figure of the axle (91) The hole (912) is provided with a ring (92), such that the inner annular surface of the ring (92) forms an inner ring surface (914) of the hub (91) and has a receiving groove (916) for the elastic member. (93) Installed with the pawl (94). The drive ring (95) is fixed to the sprocket seat (97) of the ratchet wheel (96), so that the outer ring surface of the drive ring (95) forms a ratchet (%) outer ring surface (962) and has a tooth groove (964). . Thereby, when the ratchet (96) rotates, it is pushed through the slot of the slot (964) of the drive ring (95).
抵棘爪(94)，使輪轂(91)產生同步轉動，同樣可達到本發明 的目的。 X 200909246 【圖式簡單說明】 第-圖為本發明第-較佳實施例之立體組 第二圖為本發明第-較佳實施例之立體分ς圖。 第三圖為本發明第—較佳與 θ、 第四圖為第三圖沿4-4心之叫視圖主局部剖視圖。 輪轂之齒槽#之狀態。°通之舰圖，轉顯示棘爪與 第五圖類同於第四圖，主要顯示棘爪及彈性件 置後與輪轂之齒槽嚙合之狀態。 、 圖為本發gg第二較佳實施例之立體分解圖。 第七圖為本發明第二較佳實施例之剖視示意圖， 扁不棘爪與棘輪之齒槽嚙合之狀態。 10 200909246 【主要元件符號說明】 自行車輪轂總成(1) 輪轂(2) 轴孔(21) 心軸(22) 螺紋段(221) 内環面(23) 5 驅動環(24) 齒槽(25) 槽壁(252，254) 凸塊(26) 棘輪(3) 鏈輪座(31) 外環面(32) 環垣(33) 容置槽(34) 凹部（342，344) 10 棘爪(4) 樞轉端(42) 齒端(44) 彈性件(5) 軸環(6) 螺桿(8) 自行車輪轂總成(9) 墊圈（7) 15 輪轂(91) 軸孔(912) 内環面(914) 容置槽(916) 環垣(92) 彈性件(93) 棘爪(94) 驅動環(95) 棘輪(96) 外環面(962) 20 齒槽(964) 鏈輪座(97) 12The purpose of the present invention is also achieved by the pawl (94) being rotated in synchronism with the hub (91). X 200909246 [Brief Description of the Drawings] The first drawing is a three-dimensional group of the first preferred embodiment of the present invention. The second drawing is a three-dimensional sectional view of the first preferred embodiment of the present invention. The third figure is the first partial view of the present invention, the first and the fourth, and the fourth is the third view along the line 4-4. The state of the tooth groove of the hub. The map of the ship, the display pawl and the fifth figure are similar to the fourth figure, mainly showing the state in which the pawl and the elastic member are engaged with the tooth groove of the hub. The figure is a perspective exploded view of the second preferred embodiment of the gg. Figure 7 is a cross-sectional view showing the state in which the flat non-pawl and the ratchet are engaged by the second preferred embodiment of the present invention. 10 200909246 [Description of main component symbols] Bicycle hub assembly (1) Hub (2) Shaft hole (21) Mandrel (22) Threaded section (221) Inner ring surface (23) 5 Drive ring (24) Cogging (25 ) Slot wall (252, 254) Bump (26) Ratchet (3) Sprocket seat (31) Outer torus (32) 垣 (33) accommodating groove (34) Recess (342, 344) 10 Pawl ( 4) Pivot end (42) Tooth end (44) Elastic member (5) Collar (6) Screw (8) Bicycle hub assembly (9) Washer (7) 15 Hub (91) Shaft hole (912) Inner ring Face (914) accommodating groove (916) 垣 (92) elastic member (93) pawl (94) drive ring (95) ratchet (96) outer ring surface (962) 20 gullet (964) sprocket seat ( 97) 12