1253371 玖、發明說明： 【發明所屬之技術領域】 本發明是有關於一種工具機之夾頭，特別是指一種以 油壓驅動夾緊或鬆釋工件之超薄型油壓夾頭。 【先前技術】 如圖1所示，現有一種工具機之油壓夹頭（同為申請 人所申請之申請案號第89218568號案），包含有一本體卜 一裝設在該本體1内部的軸座2、一可轉動地軸設在該軸 座2内部之轉軸單元3及一套設在該轉轴單元3内部且可 對工件產生束夾或鬆釋之筒夾單元4。該本體丨具有一沿 軸線設置的貫孔101、一可將壓力油注入的注油孔ι〇2及 一可使回收壓力油之回流槽1〇3。該軸座2具有一對應於 該注油孔102的第一導油孔2〇1、一第二導油孔2〇2。該 轉軸單元3具有一可相對軸座2產生轉動的轉動件3〇ι、 一可驅動該轉動件301轉動之驅動輪302及一可在轉動件 3〇1中沿軸線產生位移的掣動座3〇3，該轉動件具有 —凹設在一外環面且對應於導油孔2〇1的環槽3〇4、一設 於側端部且可容置掣動座303的容室3〇5、一由環槽3〇4 連通至該容室305的第一油道3〇6及一第二導油孔2〇2連 通至該容室305的第二油道307,該第一、二油道3〇6、 3〇7分別設置在該掣動座303的二側，且掣動座3〇3可將 容室305區隔成一與第一油道3〇6相通的前侧部3〇5，及一 與第二油道307相通的後側部305”。該筒失單元4具有一 受該掣動座303所連動之滑座401及一受該滑座4〇1驅動 1253371 而可沿徑向產生束緊、鬆釋的筒< 4〇2。當壓力油自注油 孔U) 2注入，且依序流經第一導油孔2 〇丄、第一油道赐， 亚進入容室305之前側部3〇5,時，即可推動該掣動座3〇3 住左移，且使筒夾402相對於滑座4()1移動，而使筒夹4〇2 件產生束緊，同日寸，原來存在於後側部305”的壓力油 會被擠動，而沿第二油道307而回流至回流槽1〇3中。當 壓力油自第二導油孔202輸入’且流經第二油道3〇7，並 進入容室305之後側部305”後，即可推動該掣動座3〇3往 右移，且使筒夾402相對於滑座401向外移動，而使筒夾 402對工件產生放鬆，以達到替換工件目的。 雖然，這種油壓夾頭可達到預期之使用目的，但是其 驅動筒夾402進行束緊、放鬆都是利用壓力油作為驅動 10 15 20 源，且壓力油會沿著本體丨與軸座2之間、軸座2與轉軸 單元3之間的縫隙滲流，所以在本體1與軸座2之間、軸 座2與轉軸單元3之間都必須設有儲油槽，該等儲油槽的 設置會增加夾頭的厚度及增加整體的體積。 【發明内容】 因此，本發明之目的，即在提供一種以壓力油進行退 除工件時，利用壓力油之壓力作用可迫使一塑形環圈產生 ’變形以達到較佳密封、防漏效果之超薄型油壓夾頭。 本發明之超薄型油壓夾頭，可夾持工件產生運轉，以 達到加工目的，該油壓夾頭包含有一本體、一裝設在該本 體内部的軸座、一裝設在該轴座内部的塑性環圈、一轴設 在該軸座内部之轉軸單元及一套設在該轉軸單元内部且 6 1253371 " 件產生束夾或鬆釋之筒夾單元。該本體具有一沿一 軸線没置的貫孔、一可注入壓力油且貫通至該貫孔的注油 力油且貫通至該貫孔的回油孔。該軸座是 套"在財體之貫孔中，具有-圍繞該軸線的外環面、— 與該外環面相背$晋& 月叹置的内裱面、一環設在該内環面的環 曰文由ϋ亥外裱面貫穿至該環槽且對應於該注油孔之導 孔、一由該外環面貫穿至該内環面且對應於該回油孔之隹 油孔。該塑性環圈是嵌套在該環槽中，具有一對應於内： 10 15 面的内周面、—與該内周面相反設置的外周面、二銜接在 内周面14外周面之間的侧面及多數由外周面貫通至内周 面且與該等導孔相連通的油孔，該内周面、外周面及該等 ^面各凹設有—圍繞軸線的凹環部，且油孔的孔徑㈣該 ^孔。销軸單元具有—可相對於軸座產生轉動且轴設在 口亥軸孔中的轉動件、—可驅動該轉動件轉動之驅動輪、一 轴U力地套設在該轉動件中之掣動座及—沿軸線 套二在4轉動件與軸座之間的彈性件，該轉動件具有一 σ、手動件及彈性件之容室、—連通在環槽與容室之間 、丨，L孔σ亥掣動座受壓力油所掣動可沿軸線朝一第一方 =生位移，該彈性件之彈力可使掣動座在未受壓力油作 用時朝F 弟一方向位移。該筒夾單元是套設在該轉動件 ’叉到該掣動座之驅動可沿軸線朝第—方向產生位移， f使工件達到鬆釋目的。藉此，該轉軸單元停止運轉時， :\ L力油以達到鬆釋工件目的，且該塑性環圈受壓力 ，可沿軸線方向及徑向產生變形，而達到密 20 1253371 封防漏目的。 本發明之功效能提供油壓夾頭在以壓力油退除工件 ^ ’可迫使一塑性環圈產生變形，進而產生較佳密封、防 漏政果，以減少油壓夾頭之厚度及縮小整體體積。 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之一較佳實施例的詳細說明中，將可清 楚的明白。 參閱圖2、圖3、圖6及圖7，本發明超薄型油壓夾 頭之較佳實施例可同時雙向夾持二工件產生運轉，以達到 雙向加工目的。該超薄型油壓夾頭包含一本體1〇、一裝設 在该本體10内部的軸座20、裝設在該轴座20内部的塑性 環圈30、一軸設在該軸座2〇内部之轉軸單元4〇及一套設 在該轉軸單元40内部且可對工件產生束夾或鬆釋之筒夾 單元50。 该本體1 0具有一沿一軸線設置的貫孔11、一可輸入 冷空氣且貫通至該貫孔丨丨的輸氣孔12 (如圖6所示）、一 可注入壓力油且貫通至該貫孔n的注油孔13 (如圖3所 示）、一可回收壓力油且貫通至該貫孔u的回油孔14 (如 圖7所不）及一裝設在該輸氣孔丨2中的止逆閥丨5 (如圖 6所示）。藉該止逆閥15設置，允許冷空氣由外朝内單向 輸入輸氣孔12中，且可防止壓力油流出。 該軸座2Q是不可轉動地套設在該本體之貫孔u 中，並具有一圍繞該轴線的外環面21、一與該外環面2 ^ 8 1253371 相背設置且可界定出-軸孔221的内環面22、—環設在該 内環面22的環槽23、—由該外環面22貫穿至該内環槽 23且對應於該輪氣孔12的第一導孔24 (如圖6所示）、 LMf面22貫穿至該内環槽23且對應於注油孔13 之第二導孔25 (如圖3所示）、一由該外環自21貫穿至該 内環面22且對應於該回油孔15之集油子l 26 (如圖7戶; 7F ) 〇 10 15 20 配合參閱圖4所示，該塑性環圈3〇是嵌套在該環槽 23中，具有—對應於内環面22的内周面31、一與該内周 面31相反設置的外周面32、二銜接在内周面31與外周面 的側面33及多數由外周面32貫通至内周面31且 …亥第—導孔25、集油孔26相連通的油孔34。該内周面 =1、外周面32及該等側面33各凹設有—圍繞軸線的凹環 % 5藉忒凹％部35之設置，促使該塑性環圈3〇具有沿 #向及軸線方向產生塑性變形及變形後回復原狀之能力。 配合參_3，該轉軸單元4G具有—可相對於轴座 生轉動且軸設在該軸孔221中的轉動件41、一可驅 =亥轉動件41轉動之驅動輪42、—可沿軸線滑動地套： 41與件41中之掣動座43、-沿軸線套設在該轉動件 二、手動座42之間的彈性件44及二套設在轉動件41盥 =20之間的軸承仏。該轉動件41具有—相反於驅動輪 環：43及彈性件44之容室411、數連通在 —宓人，、谷室411之間的引流孔412。該掣動座43具有 * 口地套設在該容室411 t的活塞部431，該活塞部仙 1253371 受壓力油所掣動可使掣動座43整體沿軸線朝一第一方向 ^產生位移，料性件44之彈力可使掣動座财未受壓 力油作用時朝-第二方向Π位移。 配合參閱圖3，該筒夾單元π早卷〇 早兀50疋套设在該轉動件41 ::亚具有-螺接在該轉動件‘丨-側端部上的第一束 J、—連結在掣動座43上且與第-束件5"目反設置的 件52、—套設在該第—束件51内部且可供工件套 -的弟-筒夹53、一套設在該第二束件52内部且可供工 10 15 20 件套設的第二筒夹54及—嵌結在該第一、二筒夹㈣ =的連動件55。該第-、二束件51、52各具有一呈推 521。 一同夹53、54產生束緊之束爽孔5U、 、、再如圖3所示’當欲鬆釋或替換工件時，啟動壓力油 土油孔13中輸入，且壓力油依序流經第二導孔π、引 流孔叫如箭頭所示），最終會進人容室4U並對掣動座 43之活基部431進行推掣動作（此時該彈性件44呈被舞 縮狀態並薇藏回釋之彈力），且使掣動座43在朝第一方： 力才曰π動第一束件52 (第二筒夾54隨即呈鬆釋狀 -)、第二束件52又對連動件55、第一筒失53產生推移， 可使才于第筒夾53自第一束件51中移出。因此，第一、 二筒灸53/ 54均可呈鬆釋，以方便於取出、替換工件。 且f此狀怨下’如圖5所示’壓力油的壓力會施加在該塑 '衣圈30的外周面32上，且利用該等凹環部奶的設置， 會使外周面32朝内周面31產生變形，同時該等側面 33 10 1253371 曰。軸、、泉方向產生向外擴張，而使得環槽2 3與轉動件41 卜周面之間產生搶封、防漏效果，亦即壓力油不會大量滲 入内環面22與轉動件41外周面之間、軸承45内部· ·等之 孔軸配合之缝隙中’所以油壓炎頭内部可減少儲油槽的設 置，進而可減少油壓夾頭的厚度及整體的體積。 10 15 Θ 6圖7所示，當關閉壓力油，利用彈性件4 4 :彈力作用會使掣動座43帛第二方向Π產生位移且使第 一、二筒夾53、54漸漸被束緊。當啟動驅動輪42帶動轉 動件41 #動的同時可啟動氣壓源，且使冷空氣通過止逆 閥15而自輸氣孔12輸入，並經第一導孔24之導引而可 流竄至軸座2。與轉動件41之間、軸承&内部（如箭頭 所不）’如此一來，正在運轉之轉軸單元4〇即可產生降溫 的效果。且更使得原來存在於該等孔軸配合處之油液可被 吹動而回流至集油孔26及回油孔14中，不僅可使壓力油 達到回收目白勺’且可減少孔軸配合處之油膜厚度 壓夾頭產生較佳之加工性能。 以使油 歸納上述，本發明之超薄型油壓夹頭，是利用壓力油 退除工件的同時，可迫使塑性環圈產生變形而達到密封、 防漏目的’且運轉時又利用冷空氣對轉軸單元進行降溫並 驅離存在於孔軸配合處、縫隙中的油液，可確保加工性 能’故確實能達到發明之目的。 惟以上所述者，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’即大凡依本發明中請專利 範圍及發明說明書内容所作之簡單的等效變化與修飾，皆 20 1253371 應仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明1 圖1是現有一種油壓夾頭之組合剖面圖； 圖2是一平面圖，說明本發明超薄型油壓夾頭的一較 佳實施例； 圖3是沿圖2中之線3 — 3的一剖面圖，說明壓力油 輸送路徑； 圖4是一局部放大示意圖，說明一塑性環圈裝設在一 車由座與一轉動件之間； 10 圖5是一變形示意圖，說明該塑性環圈受壓力油的壓 力作用而產生變形； 圖6是沿圖2中之線6 — 6的—剖面圖，說明冷空氣 之輪送路徑；及 7的一剖面圖，說明油壓夾 用之收集路徑。 圖7是沿圖2中之線7 — 了 碩内部之油膜受冷空氣吹送作用 12 1253371 【圖式之主要元件代表符號簡單說明】 10 本體 11 貫孔 12 輸氣孔 13 注油孔 14 回油孔 15 止逆閥 20 軸座 21 外環面 22 内環面 221 軸孔 23 環槽 24 第一導孔 25 第二導孔 26 集油孔 30 塑性環圈 31 内周面 32 外周面 33 側面 34 油孔 35 凹環部 40 轉軸單元 41 轉動件 411 容室 412 引流孔 42 驅動輪 43 掣動座 43 掣動座 431 活塞部 44 彈性件 45 轴承 I 第一方向 Π 第二方向 50 筒夾單元 51 第一束件 511 束夾孔 52 第二束件 521 束夾孔 53 /r/r 4- 同夾 54 第二筒夾 55 連動件 13BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chuck for a machine tool, and more particularly to an ultra-thin hydraulic chuck that is driven by a hydraulic pressure to clamp or release a workpiece. [Prior Art] As shown in FIG. 1 , a hydraulic chuck of a utility machine (the same as the application No. 89218568 filed by the applicant) includes a body and a shaft mounted inside the body 1 a seat 2, a rotary shaft unit 3 rotatably disposed inside the shaft base 2, and a set of collet units 4 disposed inside the rotary shaft unit 3 and capable of generating a bundle clamp or releasing the workpiece. The body 丨 has a through hole 101 disposed along the axis, an oil hole ι 2 for injecting pressurized oil, and a return groove 1 〇 3 for recovering pressure oil. The shaft seat 2 has a first oil guiding hole 2〇1 and a second oil guiding hole 2〇2 corresponding to the oil filling hole 102. The rotating shaft unit 3 has a rotating member 3〇 which is rotatable relative to the shaft seat 2, a driving wheel 302 which can drive the rotating member 301 to rotate, and a movable seat which can be displaced along the axis in the rotating member 3〇1. 3〇3, the rotating member has a ring groove 3〇4 recessed in an outer ring surface corresponding to the oil guiding hole 2〇1, a chamber 3 disposed at the side end portion and accommodating the movable seat 303 〇5, a first oil passage 3〇6 connected to the chamber 305 by the annular groove 3〇4 and a second oil guiding hole 2〇2 are connected to the second oil passage 307 of the chamber 305, the first The two oil passages 3〇6 and 3〇7 are respectively disposed on two sides of the movable seat 303, and the movable seat 3〇3 can partition the chamber 305 into a front side communicating with the first oil passage 3〇6. a portion 3〇5, and a rear side portion 305” communicating with the second oil passage 307. The cylinder loss unit 4 has a sliding seat 401 coupled to the moving seat 303 and is driven by the sliding seat 4〇1. 1253371 can produce a tightly and loosely released cylinder < 4〇2 in the radial direction. When the pressure oil is injected from the oil injection hole U) 2, and sequentially flows through the first oil guiding hole 2 〇丄, the first oil passage , when the sub-access chamber 305 is in front of the side 3〇5, it can be pushed The swaying seat 3〇3 moves to the left and moves the collet 402 relative to the carriage 4()1, so that the collet 4〇2 pieces are tightened, the same day, the pressure originally existing at the rear side 305” The oil is squeezed and flows back into the return tank 1〇3 along the second oil passage 307. When the pressure oil is input from the second oil guiding hole 202 and flows through the second oil passage 3〇7 and enters the side portion 305 of the chamber 305, the moving seat 3〇3 can be pushed to the right, and The collet 402 is moved outwardly relative to the carriage 401, so that the collet 402 relaxes the workpiece to achieve the purpose of replacing the workpiece. Although the hydraulic collet can achieve the intended purpose of use, it drives the collet 402 The tightening and loosening are performed by using the pressure oil as the driving source of 10 15 20 , and the pressure oil will flow along the gap between the main body 丨 and the shaft seat 2, between the shaft seat 2 and the rotating shaft unit 3, so in the body 1 and An oil storage groove must be provided between the shaft seats 2 and between the shaft base 2 and the rotating shaft unit 3. The arrangement of the oil storage grooves increases the thickness of the chuck and increases the overall volume. [Invention] Therefore, the object of the present invention The invention provides an ultra-thin hydraulic collet which can force a deformation of a shaped ring to achieve a better sealing and leakage prevention effect by using a pressure oil to remove the workpiece. Ultra-thin hydraulic chuck for clamping workpieces For the purpose of processing, the hydraulic collet comprises a body, a shaft seat mounted inside the body, a plastic ring mounted inside the shaft seat, a shaft unit disposed inside the shaft seat and a collet unit disposed inside the shaft unit and having a beam clamp or loose release. The body has a through hole that is not disposed along an axis, and a pressure oil can be injected and penetrates the through hole. The oil is injected into the oil return hole of the through hole. The shaft seat is a sleeve " in the through hole of the financial body, having an outer annular surface surrounding the axis, - opposite to the outer annular surface, $ Jin & The inner slanting surface of the moon sigh, and a ring ring disposed on the inner ring surface penetrates from the outer surface of the ϋ ϋ to the ring groove and corresponds to the guiding hole of the oil hole, and the outer ring surface penetrates into the inner ring a toroidal surface corresponding to the oil return hole of the oil return hole. The plastic ring ring is nested in the ring groove, and has an inner circumferential surface corresponding to the inner surface: 10 15 faces, which is opposite to the inner circumferential surface a side surface between the outer peripheral surface and the outer peripheral surface of the inner peripheral surface 14 and a plurality of outer peripheral surfaces extending to the inner peripheral surface and The oil hole communicating with the hole, the inner circumferential surface, the outer circumferential surface and the surface are recessed with a concave ring portion around the axis, and the oil hole has an aperture (4) the hole. The pin unit has - can be relative to the shaft a rotating member that rotates and has a shaft disposed in the hole of the hole shaft, a driving wheel that can drive the rotating member, a tilting seat that is axially sleeved in the rotating member, and along the axis sleeve 4 an elastic member between the rotating member and the shaft seat, the rotating member has a σ, a manual member and a chamber of the elastic member, communicating between the ring groove and the chamber, and the L-hole σ 掣The oil can be moved along the axis toward a first square = the displacement of the elastic member, the elastic force of the elastic member can be displaced in the direction of the F-body when the pressure is not applied by the pressure oil. The collet unit is sleeved on the rotating member 'The drive to the swaying seat can be displaced along the axis in the direction of the first direction, f to release the workpiece. Thereby, when the rotating shaft unit is stopped, the oil is lifted to achieve the purpose of releasing the workpiece, and the plastic ring is subjected to pressure, and can be deformed along the axial direction and the radial direction to achieve the purpose of preventing leaks of the seal 2013533. The effect of the invention can provide the oil collet to retreat the workpiece with the pressure oil, which can force a plastic ring to deform, thereby producing a better sealing and leakproofing effect, thereby reducing the thickness of the hydraulic chuck and reducing the overall thickness. volume. The above and other technical contents, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments. Referring to Figures 2, 3, 6, and 7, the preferred embodiment of the ultra-thin hydraulic collet of the present invention can simultaneously operate two workpieces in both directions to achieve bidirectional machining. The ultra-thin hydraulic collet comprises a body 1 , a shaft seat 20 mounted inside the body 10 , a plastic ring 30 mounted inside the shaft seat 20 , and a shaft disposed inside the shaft seat 2 The rotating shaft unit 4A and a set of collet units 50 disposed inside the rotating shaft unit 40 and capable of generating a bundle or releasing the workpiece. The body 10 has a through hole 11 disposed along an axis, a gas transmission hole 12 (shown in FIG. 6) for inputting cold air and penetrating the through hole, a pressure oil can be injected and penetrated to the body An oil injection hole 13 of the through hole n (shown in FIG. 3), an oil return hole 14 that can recover the pressure oil and penetrates the through hole u (as shown in FIG. 7), and a gas hole 丨2 installed therein The check valve 丨5 in the middle (as shown in Figure 6). By means of the check valve 15, the cold air is allowed to be unidirectionally input into the air supply port 12 from the outside to the inside, and the pressure oil can be prevented from flowing out. The axle seat 2Q is non-rotatably sleeved in the through hole u of the body, and has an outer annular surface 21 surrounding the axis, and is disposed opposite to the outer annular surface 2^ 8 1253371 and can be defined - An inner annular surface 22 of the shaft hole 221, a ring groove 23 provided in the inner annular surface 22, a first guide hole 24 extending from the outer annular surface 22 to the inner annular groove 23 and corresponding to the wheel vent 12 (As shown in FIG. 6), the LMf surface 22 penetrates into the inner ring groove 23 and corresponds to the second guide hole 25 of the oil hole 13 (as shown in FIG. 3), and the outer ring extends from the 21 to the inner ring. The face 22 and the oil collector l 26 corresponding to the oil return hole 15 (as shown in FIG. 7; 7F) 〇 10 15 20 . Referring to FIG. 4 , the plastic ring 3 嵌套 is nested in the ring groove 23 . The inner peripheral surface 31 corresponding to the inner annular surface 22, the outer peripheral surface 32 provided opposite to the inner peripheral surface 31, the side surface 33 that connects the inner peripheral surface 31 and the outer peripheral surface, and the outer peripheral surface 32 are mostly penetrated to The inner peripheral surface 31 and the oil hole 34 through which the guide hole 25 and the oil collecting hole 26 communicate. The inner circumferential surface =1, the outer circumferential surface 32 and the side surfaces 33 are each recessed—the concave ring % 5 around the axis is provided by the concave portion 30, which causes the plastic ring 3 〇 to have a direction along the # direction and the axis The ability to produce plastic deformation and return to its original shape after deformation. In conjunction with the reference numeral 3, the shaft unit 4G has a rotating member 41 that is rotatable relative to the shaft and that is axially disposed in the shaft hole 221, and a driving wheel 42 that can rotate the rotating member 41. Sliding cover: 41 and the movable seat 43 in the member 41, the elastic member 44 disposed between the rotating member 2 and the manual seat 42 along the axis, and the bearing disposed between the rotating member 41盥=20 Hey. The rotating member 41 has a drain hole 412 which is opposite to the driving ring 43 and the elastic chamber 44, and the number of the communicating holes 411 between the valleys 411. The swaying seat 43 has a piston portion 431 which is sleeved in the chamber 411 t. The piston portion 1253371 is swayed by the pressure oil to cause the swaying seat 43 to be displaced along the axis toward the first direction. The elastic force of the material member 44 can cause the tilting seat to be displaced in the second direction when it is not subjected to the pressure oil. Referring to FIG. 3, the collet unit π is pre-rolled and placed on the rotating member 41. The first bundle J is connected to the side end of the rotating member. The member 52 on the swaying seat 43 and disposed opposite to the first member 5", the sleeve 52, which is disposed inside the first beam member 51 and available for the workpiece sleeve, is provided in the set A second collet 54 inside the second bundle member 52 and sleeved for 10 15 20 pieces and a linking member 55 embedded in the first and second collet (4). The first and second bundle members 51, 52 each have a push 521. Together with the clamps 53, 54 to produce a bundle of cool holes 5U, and, as shown in Figure 3, when the workpiece is to be released or replaced, the pressure oil oil hole 13 is started to be input, and the pressure oil flows through the first step. The two guiding holes π and the drainage holes are called arrows (arrows), and finally enter the human chamber 4U and push the living base 431 of the swaying seat 43 (at this time, the elastic member 44 is in a state of being swayed and Weizang Release the elastic force), and the swaying seat 43 is facing the first side: the first beam 52 is moved (the second collet 54 is loosely released), and the second bundle 52 is interlocked The member 55 and the first cylinder 35 are displaced, so that the first collet 53 can be removed from the first bundle 51. Therefore, the first and second tube moxibustion 53/54 can be released to facilitate the removal and replacement of the workpiece. And the pressure of the pressure oil is applied to the outer peripheral surface 32 of the plastic collar 30, and the outer peripheral surface 32 is made inward by the arrangement of the concave ring portions of the milk. The circumferential surface 31 is deformed while the sides 33 10 1253371 曰. The shaft and the spring direction are outwardly expanded, so that the seal groove and the leakage preventing effect are generated between the ring groove 2 3 and the circumferential surface of the rotating member 41, that is, the pressure oil does not infiltrate into the inner ring surface 22 and the outer periphery of the rotating member 41. Between the faces, the inside of the bearing 45, etc., the hole shaft fits in the gap. Therefore, the inside of the oil pressure head can reduce the arrangement of the oil sump, thereby reducing the thickness of the hydraulic chuck and the overall volume. 10 15 Θ 6 As shown in Fig. 7, when the pressure oil is closed, the elastic member 4 4: the elastic force causes the displacement of the swaying seat 43 帛 in the second direction and the first and second collets 53, 54 are gradually tightened. . When the driving wheel 42 is driven to drive the rotating member 41 to move, the air pressure source can be activated, and the cold air is input from the air inlet 12 through the check valve 15, and can be guided to the shaft through the guiding of the first guiding hole 24. Block 2. Between the rotating member 41 and the inside of the bearing & (as indicated by the arrow), the rotating shaft unit 4 that is operating can produce a cooling effect. Moreover, the oil originally existing in the matching portion of the hole shafts can be blown and returned to the oil collecting hole 26 and the oil return hole 14, so that the pressure oil can not only reach the recycling direction but also reduce the hole shaft matching portion. The oil film thickness crimping head produces better processing properties. In order to summarize the oil, the ultra-thin hydraulic collet of the present invention uses the pressure oil to remove the workpiece, and can force the plastic ring to deform to achieve sealing and leakage prevention purposes, and utilizes cold air during operation. The shaft unit cools down and dislodges the oil present in the joints and gaps of the hole shaft to ensure the processing performance, so it can indeed achieve the purpose of the invention. However, the above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent change and modification of the patent scope and the description of the invention in the present invention. , 20 1253371 shall remain within the scope of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing a combination of a conventional hydraulic chuck; FIG. 2 is a plan view showing a preferred embodiment of the ultra-thin hydraulic chuck of the present invention; FIG. 3 is along FIG. Figure 3 is a partially enlarged schematic view showing a plastic ring mounted between a vehicle seat and a rotating member; Figure 5 is a schematic view of the deformation of the line 3-3; , the plastic ring is deformed by the pressure of the pressure oil; FIG. 6 is a cross-sectional view taken along line 6-6 of FIG. 2, illustrating a cooling air transfer path; and a sectional view of 7 illustrating the oil The collection path for the clamp. Figure 7 is along the line 7 in Figure 2 - the oil film inside the air is blown by the cold air 12 1253371 [Simplified description of the main components of the figure] 10 body 11 through hole 12 gas hole 13 oil hole 14 oil hole 15 check valve 20 shaft seat 21 outer ring surface 22 inner ring surface 221 shaft hole 23 ring groove 24 first guide hole 25 second guide hole 26 oil collecting hole 30 plastic ring 31 inner peripheral surface 32 outer peripheral surface 33 side 34 oil Hole 35 Recessed ring portion 40 Rotary shaft unit 41 Rotating member 411 Housing chamber 412 Drain hole 42 Driving wheel 43 Movable seat 43 Movable seat 431 Piston portion 44 Elastic member 45 Bearing I First direction Π Second direction 50 Collet unit 51 a bundle 511 bundle hole 52 second bundle 521 bundle aperture 53 /r/r 4- same clamp 54 second collet 55 linkage 13