200831345 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種花轂，特別是指一種無聲花轂。 【先前技術】 圖1顯示習知申請案號第86205033號專利案一種無聲 花轂1，該無聲花轂1安裝於一自行車（圖未示），並包含 一固設於該自行車的心軸11、一轂體單元12、一驅動單元 13以及一離合單元14。 參閱圖1與圖2，該轂體單元12包括一圍繞該心軸u 的轂殼121，以及一固設於該轂殼121内周面並具有一受掣 面123的摩擦套筒122。該驅動單元13可旋轉地安裝於該 心軸11上，並包括一輸入段131及一具有一外螺紋部133 的驅動段132。 該離合單元14包括一固定套筒141、一干涉件142以 及一離合套筒143。該固定套筒141套設於該心軸丨丨上， 該干涉件142可旋轉摩擦地套設於該固定套筒141上，該 離合套筒143螺合於該外螺紋部133，並具有一嵌卡於該干 涉件142外的導引槽144 ,以及一對應該受掣面123的掣動 面 145 〇 當该驅動單元13朝一第一方肖a旋轉日夺，該離合套筒 143因5亥干涉件142之導引，會被該驅動單元u帶動朝今 摩擦套筒m直線螺進，直職掣動自145喃合該受擎面乂 U3，使該轂殼121被連動。 當该驅動單元13朝一士 朝第一方向B疑轉時，該離合套筒 5 200831345 ==!而脫離該摩擦套筒122，使該轂殼121解除 時，該:二套:套冑143抵住該干涉件142而無法再後退 干斗件5 143開始隨該驅動單元轉，並帶動該 干以件1442相對該固定套筒141摩擦旋轉。 女該無聲花轂1雖然可以達到無聲驅動的功能，但是仍 有以下缺失： 一、 該無聲花較1新出廠時，該干涉件142為新品， 因此與該固定套筒141間的滑動摩擦力較大，使用者在帶 動該驅動單元13朝該第二方向B旋轉時會覺得阻力較大， 且會發出噪音，具有空轉阻力與噪音較大的缺失。 二、 當該無聲花轂1使用久了，該干涉件142因為磨 耗而與該固定套筒141間的摩擦力變小了，使用者在帶動 泫驅動單元13朝該第一方向A旋轉時，該離合套筒不 易維持直線前進，甚至可能造成使用者踩空，具有驅動反 應不佳的缺失。 二、ό亥干涉件142因大面積與該固定套筒〖々I產生摩 擦，因此容易摩耗損壞，導致有使用壽命較短的缺失。 【發明内容】 因此’本發明之目的’即在提供一種可以降低空轉阻 力與噪音、驅動反應較佳且能提高使用壽命的無聲花較。 於是，本發明無聲花轂是包含一心軸、一較體單元、 一驅動單元以及一離合單元。 該心軸包括一第一端，以及一相反於該第一端的第二 端。該轂體單元是可旋轉地安裝於該心軸上，並包括一圍 6 200831345 繞該心軸的轂殼，以及一固設於該轂殼内周面的摩擦套筒 ’該摩擦套筒具有一由該第一端朝第二端漸次縮徑的受掣 面。 該驅動單元可相對該心軸沿一第一方向與一相反該第 一方向的第二方向旋轉地安裝於該心軸上，並包括一位在 该轂殼外側的輸入段及一位於該轂殼與該心軸之間的驅動 段’該驅動段具有一外螺紋部。 邊離合單元包括一離合套筒、至少一干涉珠以及一彈 性件組。該離合套筒設置於該轂殼内圍繞該心軸，並具有 一螺合於該驅動段的外螺紋部的被驅動段及一延伸段。該 被驅動段具有一呈錐面狀且對應該受掣面的掣動面，該延 伸&具有至少一容置孔。該干涉珠置於該容置孔中，該彈 性件組設置於該延伸段，並恆頂推該干涉珠抵住該心轴。 S孩驅動單元朝該第一方向旋轉時，利用該干涉珠對 該心軸摩擦干涉，該離合套筒會朝該摩擦套筒靠近，直到 該掣動㈣合該受掣面，使該穀殼被連動，t該驅動單元 朝該第二方向旋轉時，該離合套筒會脫離該摩擦套筒，使 該轂殼解除連動。 本發明無聲花轂是以該干涉珠抵住該心軸產生的干涉 力，使得該離合套筒相對該驅動單元旋轉，此㈣式可以 降低該無聲花轂空轉阻力盥哞立、 使用壽命。 一曰使驅動反應較佳且提高 【實施方式】 特點與功效，在 有關本發明之前述及其他技術内容 7 200831345 以下配合參考圖式之三個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的戈 明内容中，類似的元件是以相同的編號來表示。 參閱圖3、圖4、圖5,本發明無聲花轂之第一較佳實 施例包含一心軸單元2、一轂體單元3、一驅動單元4以及 一離合單元5。 該心軸單元2包括一心軸20，該心軸20包括一第一端 21、一相反於該第一端21的第二端22、一介於該第一、二 端21、22之間的干涉段23、一介於該干涉段23與該第一 端21之間且徑寬大於該干涉段23的擋止段24，以及一介 於該干涉段23與該擋止段24之間的擋緣25。 該轂體單元3是可旋轉地安裝於該心軸20上，並包括 一圍繞該心軸20的轂殼31、一固設於該轂殼31内周面的 摩擦套筒32、一套設於該心軸2〇上的第一軸承33，以及 一套設於該驅動單元4上的第二軸承34。該轂殼31二端分 別套設於該第一、二軸承33、34上，該摩擦套筒32具有 一由該第一端21朝第二端22漸次縮徑的受掣面321。 該驅動單元4可相對該心軸20沿一第一方向C與一相 反该第一方向C的第二方向d旋轉地安裝於該心軸20上， 並包括一位在該轂殼31外側的輸入段41、一位於該轂殼 3 1與该心轴2〇之間的驅動段42，及一套設於該心軸20上 的驅動軸承43。該輸入段41及驅動段42是一體成型，且 。亥輸入段41具有一沿徑向朝外一體延伸的齒盤411，該輸 8 200831345 入奴4ι套设於該驅動軸承43上，該驅動段42供該第二轴 承34套設，且具有一外螺紋部421。 δ亥離合單元5包括一離合套筒51、二顆干涉珠52以及 彈性件組53。該離合套筒51設置於該轂殼31内圍繞該 心軸2〇，並具有一螺合於該驅動段42的外螺紋部421的被 驅動段511，及一對應該心軸2〇干涉段23的延伸段512。 该被驅動# 511具有一呈錐面狀且對應該受掣面321的擎動 面513 亥延伸段512具有二個自該延伸段5丨2 一外周面沿 徑向延伸至一内周面的容置孔514。該等干涉珠U分別置 於該容置1514中，該等容置孔514内端的孔徑皆小於該 等干涉珠52的徑寬。 ' 該彈性件組53具有一套設於該延伸段512鄰近該容置 孔5Η -端的套環部531，以及二片自該套環部53以轴向 朝該心軸20傾斜延伸的推抵彈片532,該等推抵彈片⑽ 分別恒頂推該等干涉珠52抵住該心軸2〇。 當該驅動單元4朝該第—方向c旋轉時，該離合套筒$ 利用該干涉珠52對該^軸2〇滾動摩擦干涉（如圖$中實200831345 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to a flower hub, and more particularly to a silent flower hub. [Prior Art] FIG. 1 shows a silent flower hub 1 of the prior art application No. 86205033, which is mounted on a bicycle (not shown) and includes a mandrel 11 fixed to the bicycle. A hub unit 12, a drive unit 13 and a clutch unit 14. Referring to Figures 1 and 2, the hub unit 12 includes a hub shell 121 surrounding the mandrel u, and a friction sleeve 122 secured to the inner peripheral surface of the hub shell 121 and having a receiving surface 123. The drive unit 13 is rotatably mounted on the mandrel 11 and includes an input section 131 and a drive section 132 having an externally threaded portion 133. The clutch unit 14 includes a fixed sleeve 141, an interference member 142, and a clutch sleeve 143. The fixing sleeve 141 is sleeved on the mandrel, and the interference member 142 is rotatably frictionally sleeved on the fixing sleeve 141. The clutch sleeve 143 is screwed to the external thread portion 133 and has a The guiding groove 144 is inserted into the outer side of the interference member 142, and a pair of the sliding surface 145 of the receiving surface 123 is rotated. When the driving unit 13 rotates toward a first square a, the clutch sleeve 143 is 5 The guiding of the interference member 142 is driven by the driving unit u to linearly screw into the friction sleeve m, and the straight-forward swaying 145 merges the receiving surface 乂U3 so that the hub shell 121 is interlocked. When the driving unit 13 is suspected of turning toward the first direction B, the clutch sleeve 5 200831345 ==! and is disengaged from the friction sleeve 122, so that when the hub shell 121 is released, the two sets: the sleeve 143 arrives The interference member 142 is stopped and the bucket member 5 143 can no longer be retracted to start to rotate with the driving unit, and the dry member 1442 is frictionally rotated relative to the fixing sleeve 141. Although the silent flower hub 1 can achieve the function of silent driving, there are still the following defects: 1. When the silent flower is newer than the factory, the interference member 142 is a new product, so the sliding friction force with the fixing sleeve 141 If the driving unit 13 rotates in the second direction B, the user feels that the resistance is large, and noise is generated, and there is a lack of idling resistance and noise. 2. When the silent flower hub 1 is used for a long time, the frictional force between the interference member 142 and the fixed sleeve 141 is reduced due to wear, and when the user drives the cymbal drive unit 13 to rotate in the first direction A, The clutch sleeve is not easy to maintain a straight forward, and may even cause the user to step on the air, which has a lack of driving reaction. 2. The interference member 142 of the ό 产生 has a friction with the fixed sleeve 々I, so it is easy to wear and damage, resulting in a short life. SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a silent flower that can reduce the idling resistance and noise, drive the reaction better, and improve the service life. Thus, the silent flower hub of the present invention comprises a mandrel, a body unit, a drive unit and a clutch unit. The mandrel includes a first end and a second end opposite the first end. The hub unit is rotatably mounted on the mandrel and includes a hub shell surrounding the mandrel 6 200831345, and a friction sleeve fixed to the inner circumferential surface of the hub shell A receiving surface that is gradually reduced in diameter from the first end toward the second end. The driving unit is rotatably mounted on the mandrel with respect to the mandrel in a first direction and a second direction opposite the first direction, and includes an input section outside the hub shell and a hub A drive section between the housing and the mandrel' has a male threaded portion. The edge clutch unit includes a clutch sleeve, at least one interference bead, and a resilient member set. The clutch sleeve is disposed within the hub shell about the mandrel and has a driven section and an extension section that are threaded to the externally threaded portion of the drive section. The driven section has a tapered surface that corresponds to the raking surface, and the extension has at least one accommodating hole. The interference beads are placed in the receiving hole, and the elastic member group is disposed on the extending portion, and the interference beads are constantly pushed against the mandrel. When the S-drive unit rotates in the first direction, the interference fringe is used to frictionally interfere with the mandrel, and the clutch sleeve is approached toward the friction sleeve until the tilting (four) engages the receiving surface to make the chaff When the driving unit rotates in the second direction, the clutch sleeve is disengaged from the friction sleeve, and the hub shell is uncoupled. The silent flower hub of the present invention is an interference force generated by the interference bead against the mandrel, so that the clutch sleeve rotates relative to the driving unit, and the formula (4) can reduce the idling resistance standing and the service life of the silent flower hub. </ RTI> </ RTI> </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; Presented. Before the present invention is described in detail, it is to be noted that in the following description, similar elements are denoted by the same reference numerals. Referring to Figures 3, 4 and 5, a first preferred embodiment of the silent flower hub of the present invention comprises a spindle unit 2, a hub unit 3, a drive unit 4 and a clutch unit 5. The mandrel unit 2 includes a mandrel 20 including a first end 21, a second end 22 opposite the first end 21, and an interference between the first and second ends 21, 22. a segment 23, a stop segment 24 between the interference segment 23 and the first end 21 and having a larger diameter than the interference segment 23, and a retaining edge 25 between the interference segment 23 and the stop segment 24 . The hub unit 3 is rotatably mounted on the mandrel 20 and includes a hub shell 31 surrounding the mandrel 20, a friction sleeve 32 fixed to the inner circumferential surface of the hub shell 31, and a set. a first bearing 33 on the mandrel 2, and a set of second bearings 34 disposed on the drive unit 4. The hub shell 31 is sleeved on the first and second bearings 33, 34, respectively, and the friction sleeve 32 has a receiving surface 321 which is gradually reduced in diameter from the first end 21 toward the second end 22. The driving unit 4 is rotatably mounted on the mandrel 20 with respect to the mandrel 20 in a first direction C and a second direction d opposite to the first direction C, and includes a bit on the outside of the hub shell 31. The input section 41, a driving section 42 between the hub shell 31 and the mandrel 2, and a set of driving bearings 43 provided on the mandrel 20. The input section 41 and the driving section 42 are integrally formed. The input section 41 has a sprocket wheel 411 extending integrally outward in the radial direction, and the input section 8200831345 is disposed on the driving bearing 43. The driving section 42 is sleeved by the second bearing 34 and has a External thread portion 421. The δ-Hui clutch unit 5 includes a clutch sleeve 51, two interference beads 52, and an elastic member group 53. The clutch sleeve 51 is disposed in the hub shell 31 around the mandrel 2, and has a driven section 511 screwed to the external thread portion 421 of the driving section 42 and a pair of the corresponding mandrel 2 〇 interference section An extension 512 of 23. The driven # 511 has a tapered surface and corresponds to the face 321 of the face 321. The extended section 512 has two extending from the extending section 5丨2 to the outer peripheral surface of the outer peripheral surface. The hole 514 is accommodated. The interference beads U are respectively disposed in the receiving portion 1514. The apertures at the inner ends of the receiving holes 514 are smaller than the diameters of the interference beads 52. The elastic member group 53 has a sleeve portion 531 disposed at the end of the extending portion 512 adjacent to the receiving hole 5, and two pieces of the pushing portion extending obliquely from the collar portion 53 toward the spindle 20 The elastic piece 532 is pushed against the elastic piece (10) to push the interference beads 52 against the mandrel 2 恒. When the driving unit 4 rotates toward the first direction c, the clutch sleeve $ utilizes the interference beads 52 to perform rolling friction interference on the shaft 2 (see FIG.
線箭頭所示），會被該驅動單元4帶動朝該摩擦套筒U 線螺進，直到該掣動面513嚙合該受掣面32 該一 31被連動。 '"軟外又 當該驅動早 八付呷，該離合套 51利用該干涉珠52對該2〇滾動摩擦切（如 虛線箭頭所示）’該離合套筒51會被該驅 m 〜干7L 4帶勤 線螺退，並脫離該摩擦套筒32，使該轂殼31解除連動。 200831345 時’該離合套筒51可朝該心軸20的第一端21後退，直到 該I涉珠52受該擋緣25限位，而使該離合套筒51無法再 更遠^該摩擦套筒32，因此該離合套筒5卜開始隨該驅動單 元工轉並▼動該干涉珠52環繞該心軸20外周面旋轉 (如圖5中實線箭頭所示）。 纟發明無聲花較不但可以達到無聲驅動的功能，還具 有以下功效： 即使该無聲花較新出廠，該干涉珠52會在心軸20 上滾動摩擦，而不是以大面積滑動摩擦的方式來產生干涉 力’因此使用者在帶動該驅動單元4朝該第二方向〇旋轉 時阻力較小，並且較為安靜，因此達到降低空轉阻力與噪 音的功效。 二、因該離合套筒51位於限位點時，該等干涉珠52 的摩擦阻力沒有增大，即使該無聲花轂使用一段時間後， 該等干涉珠52的干涉力也不會降低。當使用者在帶動該驅 動單元4朝該第一方向c旋轉時，該離合套筒51仍會與該 驅動單元4產生相對直線運動，使該掣動面$丨3嚙合該受 掣面321，因此達到保持驅動反應良好功效。 二、该干涉珠52在該心軸20外周面滾動，其接觸面 積較小’且珠體的硬度高，不易磨耗而造成損壞，達到使 用壽命較長的功效。 參閱圖6與圖7，本發明無聲花轂之第二較佳實施例大 致與該第一較佳實施例相同，其不同處在於該心軸單元2 還包括一形成於該心軸20外的擋環26，及多數個可滾動地 10 200831345 嵌於該擋環26與該延伸段512間的擋珠27。該離合單元5 的容置孔514與干涉珠52的數目為三，該離合單元5還包 括三個螺鎖於該延伸段512並分別塞住該等容置孔514 — 外端的固定元件54,及-輔助彈性件55。該辅助彈性件55 二端分別抵住轂體單元3與該離合套筒51，使該離合套筒 51常保朝該心軸2G的第-端21後退的趨勢，該彈性件組 53具有二個壓縮彈簧533，每一壓縮彈簧二端分別推 抵該固定元件54與該干涉珠52。該延伸段512還具有—嵌 槽515 ’該嵌# 515形成於該延伸段512鄰近該被驅動段 5n的端，並沿軸向朝該心軸20的第一端21延伸，且供 該被驅動段511緊配合嵌入。 /、 當該驅動單元4朝該第二方向D旋轉時，該離合套筒 =會脫離該摩擦套筒32，該離合套筒51可朝該心軸2〇的 第/而21後退，直到該延伸段512推抵該等擋珠27緊靠 二擋衣26為止，此時，該離合套筒51會開始隨該驅動單 兀4工轉’並帶動該等干涉珠52環繞該心軸2〇外周面旋 轉且4等播珠27會同時相對該延伸段512與該擋環26 碇轉’藉此，同樣可以達到上述第一較佳實施例的功效。 麥閱圖 ★一 ，本發明無聲花轂之第三較佳實施例大致與該 第二較佳實施例相同，其不同處在於該心軸單it 2以-銅 而、製成的耐磨裱28取代該等擋珠π (如圖6所示），該 、衣28可旋轉地套設於該心軸2〇外。當該驅動單元4 朝該第二方 > 32，上 。D旋轉時，該離合套筒51會脫離該摩擦套筒 ^離口套筒51可朝該心軸20的第一端21後退，直到 11 200831345 忒延伸段512推抵該耐磨環28緊靠該擂環％為止，此時 該離合套筒51會開始隨該驅動單元4空轉，並帶動該等 =涉珠52環繞該心軸2〇外周面旋轉，且該耐磨環28會同 柃相對该延伸段512與該擋環26旋轉，藉此，同樣可以達 到上述的功效。 值得長1的疋’在節省成本的考量上，也可以將該干 涉珠52、推抵彈片532、容置孔514、壓縮彈簧533數目皆 ， 減少為一個，就足以達到上述的功效。 白 又上述實施例中，該擋環26是與該心軸20分別製作 ，再套固在一起，也可以直接在該心軸2Q上一體車削 擋環26。 碎 准以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾， 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一剖視圖，說明習知一種無聲花轂的一驅動單 元朝一第一方向旋轉； 圖2是一類似圖i的視圖，說明該驅動單元朝—第二 方向旋轉， 圖3是一剖視圖，說明該本發明無聲花轂的一第〜 佳實施例； 奴 圖4是該第一較佳實施例的一放大剖視圖，說明〜 動單元朝一第一方向旋轉； 1 12 200831345 圖5是一類似圖4的視圖，說明該驅動單元朝一第二 方向旋轉； 圖6是一剖視圖，說明本發明無聲花轂的一第二較佳 實施例； 圖7是一剖視圖，說明三個壓縮彈簧分別與三個固定 元件和三顆干涉珠的推抵情形；及 圖8是一剖視圖，說明本發明無聲花轂的一第三較佳 實施例。 13 200831345 【主要元件符號說明】 2 * … …·心軸單元 42*·"· •…驅動段 20…… …·心軸 421… …·外螺紋部 21 ·… •…第一端 43••… •辱£動轴承 22 "… •…第二端 5…… •…離合單元 23….· …·干涉段 51 …·· —離合套疴 24“… …·擋止段 511… •…被驅動段 25*·… •…擋緣 512… …·延伸段 26··· —擋環 513… •…掣動面 27…… •…擋珠 514… •…容置孔 2 8 * — —耐磨環 515… …·肷槽 3…… •…轂體單元 52··… •…干涉珠 31 "… …·轂殼 53••… •…彈性件組 32 …·· …·摩擦套筒 531… •…套環部 32卜· •…受掣面 532… •…推抵彈片 33…… —弟一轴承 533… •…壓縮彈簣 34·.·.· •…第二軸承 54····. …·固定元件 4…… …·驅動單元 55…… •…輔助彈性件 41 … …*輸入段 C…… …·第一方向 411… •…齒盤 D....... •…第二方向 14As indicated by the line arrow, the driving unit 4 drives the U-thread of the friction sleeve until the flank 513 engages the receiving surface 32 and the 31 is interlocked. '"Soft outside and when the drive is eight, the clutch sleeve 51 uses the interference bead 52 to roll and rub the 2 turns (as indicated by the dashed arrow) 'The clutch sleeve 51 will be driven by the m~ dry The 7L 4 belt is retracted and disengaged from the friction sleeve 32 to disengage the hub shell 31. At 200831345, the clutch sleeve 51 can be retracted toward the first end 21 of the mandrel 20 until the I bead 52 is constrained by the retaining edge 25, so that the clutch sleeve 51 can no longer be further. The cylinder 32, therefore, the clutch sleeve 5 begins to rotate with the drive unit and moves the interference bead 52 around the outer circumference of the mandrel 20 (as indicated by the solid arrows in Fig. 5).纟Inventing the silent flower can not only achieve the function of silent driving, but also has the following effects: Even if the silent flower is newer, the interference bead 52 will roll and rub on the mandrel 20 instead of causing interference by sliding friction in a large area. Therefore, the user has less resistance and is quieter when driving the driving unit 4 to rotate in the second direction, thereby achieving the effect of reducing the idling resistance and noise. 2. When the clutch sleeve 51 is at the limit point, the frictional resistance of the interference beads 52 does not increase, and even if the silent flower hub is used for a period of time, the interference force of the interference beads 52 does not decrease. When the user drives the driving unit 4 to rotate in the first direction c, the clutch sleeve 51 still generates a relative linear motion with the driving unit 4, so that the driving surface $丨3 engages the receiving surface 321 . Therefore, the effect of maintaining the driving reaction is good. 2. The interference beads 52 roll on the outer peripheral surface of the mandrel 20, and the contact area is small', and the hardness of the beads is high, which is not easy to be worn and causes damage, and the effect of using the service life is long. Referring to FIGS. 6 and 7, a second preferred embodiment of the silent flower hub of the present invention is substantially the same as the first preferred embodiment, except that the spindle unit 2 further includes a core tube 20 formed outside the spindle 20 A retaining ring 26, and a plurality of ballasts 27 that are slidably inserted between the retaining ring 26 and the extended section 512. The number of the receiving holes 514 and the interference beads 52 of the clutch unit 5 is three. The clutch unit 5 further includes three fixing members 54 that are screwed to the extending portion 512 and respectively plug the outer ends of the receiving holes 514. And - an auxiliary elastic member 55. The two ends of the auxiliary elastic member 55 respectively abut against the hub unit 3 and the clutch sleeve 51, so that the clutch sleeve 51 tends to retreat toward the first end 21 of the spindle 2G, and the elastic member group 53 has two Compression springs 533, the two ends of each compression spring are respectively pushed against the fixing member 54 and the interference beads 52. The extension 512 further has a recess 515' formed on the end of the extended section 512 adjacent to the driven section 5n and extending axially toward the first end 21 of the spindle 20 for the The drive section 511 is tightly fitted and embedded. When the driving unit 4 rotates in the second direction D, the clutch sleeve = will be disengaged from the friction sleeve 32, and the clutch sleeve 51 can retreat toward the second/the 21 of the spindle 2〇 until the The extension 512 is pushed against the second bead 27 to abut the second shield 26, at which time the clutch sleeve 51 will begin to rotate with the drive unit 4 and drive the interference beads 52 around the mandrel. The outer peripheral surface is rotated and the 4th or so bead 27 is simultaneously rotated relative to the extension 512 and the retaining ring 26, thereby achieving the same effect as the first preferred embodiment described above. The third preferred embodiment of the silent flower hub of the present invention is substantially the same as the second preferred embodiment except that the mandrel single it 2 is made of -copper. 28 replaces the ball π (as shown in FIG. 6), and the garment 28 is rotatably sleeved outside the mandrel. When the drive unit 4 is facing the second side > 32, on. When the D rotates, the clutch sleeve 51 will be disengaged from the friction sleeve, and the exit sleeve 51 can be retracted toward the first end 21 of the spindle 20 until the 11 200831345 忒 extension 512 is pressed against the wear ring 28 At this time, the clutch sleeve 51 will start to idle with the driving unit 4, and drive the ball 52 to rotate around the outer circumference of the mandrel 2, and the wear ring 28 will be opposite to the same. The extension section 512 and the retaining ring 26 are rotated, whereby the above-mentioned effects can be achieved as well. In the cost-saving considerations, the number of the interference beads 52, the shrapnel 532, the accommodating hole 514, and the compression spring 533 can be reduced to one, which is sufficient to achieve the above-mentioned effects. White In the above embodiment, the retaining ring 26 is separately formed and assembled with the mandrel 20, and the turning ring 26 can be integrally formed directly on the mandrel 2Q. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention. , is within the scope of the patent of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a driving unit of a silent flower hub rotated in a first direction; Fig. 2 is a view similar to Fig. i, showing the driving unit rotating in a second direction, Figure 3 is a cross-sectional view showing a first preferred embodiment of the silent flower hub of the present invention; Figure 4 is an enlarged cross-sectional view of the first preferred embodiment illustrating the rotation of the unit to a first direction; 1 12 200831345 Figure 5 is a view similar to Figure 4, showing the drive unit rotated in a second direction; Figure 6 is a cross-sectional view showing a second preferred embodiment of the silent flower hub of the present invention; Figure 7 is a cross-sectional view showing three The compression spring is respectively pushed against the three fixing elements and the three interference beads; and FIG. 8 is a cross-sectional view showing a third preferred embodiment of the silent flower hub of the present invention. 13 200831345 [Description of main component symbols] 2 * ... ... mandrel unit 42 * · " · • ... drive section 20 ... ... mandrel 421 ... ... external thread section 21 ... ... • ... first end 43 • •... • Insulting bearings 22 "... •...Second end 5... •... Clutch unit 23...··· Interference section 51 ...·· — Clutching sleeve 24“...·stop section 511... ...driven section 25*·... •... retaining edge 512... ...·extending section 26··· — retaining ring 513... •... raking surface 27... •... rib 514... •... accommodating hole 2 8 * — - wear ring 515... 肷 3 3... •... hub unit 52··... •... interference beads 31 "... hub shell 53••... •...elastic member group 32 ...····friction Sleeve 531... •... collar portion 32 b... • receiving surface 532... •... pushing against the shrapnel 33... - brother-bearing 533... •...compressing magazine 34·..... ····....·Fixed element 4............·Drive unit 55...•...Auxiliary elastic member 41 ... ...* input section C... ...·first direction 411... •...toothed disk D.. ..... •...second direction 14