592883 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油壓夾頭。 【先前技術】 如圖1所示，現有一種工具機之油壓夾頭（同為申請 · 人所申請之申請案號第892)8568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内部之轉轴單元3及一套設在該轉轴單元3内部且可 春 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1〇1、一可將壓力油注入的注油孔1〇2及 一可使回收壓力油之回流槽1〇3。該轴座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3〇1、 一可驅動該轉動件301轉動之驅動輪3〇2及一可在轉動件 301中沿軸線產生位移的掣動座3〇3，該轉動件3〇1具有 一凹設在一外環面且對應於導油孔2〇1的環槽3〇4、一設馨 於側端部且可容置掣動座303的容室305、一由環槽3二 連通至該容室305的第一油道及_第二導油孔搬連 通至該容室3〇5的第二油道m、 3〇7分別設置在該掣動座3G3的二侧，且掣動座則可將 容室3〇5區隔成一與第一油道306相通的前側部3〇5，及一 與第二油道307相通的後側部3〇5 ”。該筒夾單元*具有一 受該掣動座303所連動之碑命μ彳u . ^ ㈣之滑座401及-雙該滑座401驅動 5 592883 ίο 而可沿徑向產生束緊、鬆釋的筒夾402。當壓力油自注油 孔102注入，且依序流經第一導油孔2〇1、第一油道306， 並進入容室305之前側部305,時，即可推動該掣動座3〇3 往左移，且使筒夾402相對於滑座401移動，而使筒夾4〇2 對工件產生束緊，同時，原來.存在於後侧部3〇5，，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 壓力油自弟二導油孔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、放鬆都是利職力油作為驅動 源，且壓力油會沿著本體]與軸座2之間、軸座2與轉抽 15 單元3之間的縫隙渗流且在縫隙中形成油膜，雖然在本體 1與軸座2之間、軸座2與轉軸單元3之間都設有集油槽 道’但是當轉動單元3相對於軸座2產生高速運轉時，存 在於缝隙中的油膜會發熱，再者，賴也會因壓力源所施 予之高壓而造纽滯’如此―來，會料加工性能。 【發明内容】 20 因此’本發明之目的，即在提供一種在轉轴單元運轉 時輸入冷空氣且利用冷空氣可達到降溫及驅離缝隙中的 壓力油以增進加工性能之油壓夾頭。 个災頭，可夾持工件產生運轉，以達到 工目的，該油壓夾頭包含有—本體、—裝設在該本艘内 6 592883 10 15 20 的軸座、一軸設在該軸座内部之轉軸單元及一套設在該轉 軸單元内u卩且可對工件產生束爽或鬆釋之筒夾單元。該本 體/、有/σ 一軸線設置的貫孔、一可輸入冷空氣且貫通至 β貝孔的輸氣孔、-可注人壓力油且貫通至該貫孔的注油 ΊΓ回收壓力油且貫通至該貫孔的回油孔。該軸座是 套又在該本體之貝孔中，具有一圍繞該軸線的外環面、一 與該外環面相背設置且可界定出—軸孔的内環面、一環設 在該内環面的内環槽、數由該外環面貫穿至該内環槽且分 別對應於該輸氣孔及注油孔之導孔、一由該外環面貫穿至 該内環面且對應於該回油孔之集油孔。該轉軸單元具有一 可相對於軸座產生轉動且軸設在該軸孔中的轉動件、一可 驅動該轉動件轉動之驅動輪、一可沿轴線滑動地套設在該 轉動件中之掣動座及一沿軸線套設在該轉動件與掣動座 之間的彈性件，該轉動件具有一可容置掣動件及彈性件之 容室、數連通在内環槽與容室之間的引流孔，該掣動座受 壓力油所掣動可沿軸線朝一第一方向產生位移，該彈性件 之坪力可使擎動座在未受壓力油作用時朝一第二方向位 移。該筒夾單元是套設在該轉動件中，受到該掣動座之驅 動可沿軸線朝第一方向產生位移，且使工件達到藤釋目 的。藉此，該轉軸單元運轉時，可輸入冷空氣以達到收油、 降溫目的，該轉軸單元停止運轉時，可輸入壓力油以達到 鬆釋工件目的。 本發明之功效是能提供油壓夾頭運轉時之降藏及減 少孔軸配合處之油膜厚度，以使油壓夾頭產生較佳之加工 7 592883592883 发明 Description of the invention: [Technical field to which the invention belongs] The present invention relates to a chuck of a machine tool, and more particularly to a hydraulic chuck that clamps or releases a workpiece by hydraulic driving. [Prior art] As shown in FIG. 1, the existing hydraulic chuck of a machine tool (the same application No. 892) 8568 filed by the applicant includes a body and is installed in the body 1 The inner shaft seat 2, a rotating shaft unit 3 rotatably provided inside the shaft seat 2, and a set of collet units 4 provided inside the rotating shaft unit 3 and capable of generating a clamp or releasing of a workpiece in the spring. The body has a through hole 101 arranged along the axis, an oil injection hole 102 for injecting pressure oil, and a reflux tank 103 for recovering pressure oil. The shaft seat 2 has a first oil guide hole 201 and a second oil guide hole 202 corresponding to the oil injection hole 102. The rotating shaft unit 3 has a rotating member 301 capable of rotating relative to the shaft seat 2, a driving wheel 3202 capable of driving the rotating member 301 to rotate, and a detent seat capable of generating displacement along the axis in the rotating member 301. 3〇3, the rotating member 301 has a ring groove 304 recessed on an outer ring surface and corresponding to the oil guide hole 201, and is provided on the side end and can accommodate the actuating seat 303 The first oil passage and the second oil guide hole which are connected to the storage chamber 305 by the ring groove 3 and the second oil passage m and 307 connected to the storage chamber 305 are respectively provided. On the two sides of the actuating seat 3G3, the actuating seat can separate the receiving room 3005 into a front side portion 305 communicating with the first oil passage 306, and a rear portion communicating with the second oil passage 307. Side 305 ". The collet unit * has a monument μ 彳 u linked by the detent 303. ^ ^ 's slide 401 and-double the slide 401 drive 5 592883 ίο can be along the path To the collet 402 which is tightened and released. When the pressure oil is injected from the oil injection hole 102, it flows through the first oil guide hole 201, the first oil passage 306 in sequence, and enters the side portion 305 before the chamber 305. , When you can push the trigger seat 303 Move to the left and move the collet 402 relative to the slide 401, so that the collet 402 will tighten the workpiece, and at the same time, the pressure oil existing in the rear side 305 will be squeezed, It then flows back to the return tank 103 along the second oil passage 307. When the pressure oil is input from the second oil guide hole 202, and flows through the second oil passage 307, and enters the side 305 of the chamber 305 " After that, the trigger seat 303 can be pushed to move to the right, and the collet 402 is moved outward relative to the slide seat 401, so that the collet 402 relaxes the workpiece to achieve the purpose of replacing the workpiece. Although this type of hydraulic chuck can achieve the intended use, the driving collet 402 for tightening and loosening is a profit source oil as the driving source, and the pressure oil will be along the body] and the shaft seat 2 , The gap between the shaft seat 2 and the rotary pumping unit 3 seeps and forms an oil film in the gap, although oil collecting channels are provided between the body 1 and the shaft seat 2 and between the shaft seat 2 and the shaft unit 3 'but When the rotating unit 3 rotates at a high speed with respect to the shaft seat 2, the oil film existing in the gap will generate heat, and furthermore, Lai will also be stuck due to the high pressure given by the pressure source. . [Summary of the Invention] Therefore, an object of the present invention is to provide an oil pressure chuck which can input cold air while the shaft unit is operating and can use the cold air to reduce the temperature and drive away the pressure oil in the gap to improve the processing performance. A disaster head, which can hold the workpiece and run to achieve the purpose of the work. The hydraulic chuck includes-the body,-a shaft seat installed in the ship 6 592883 10 15 20, and a shaft is provided inside the shaft seat A rotating shaft unit and a collet unit which is arranged in the rotating shaft unit and can produce a smooth or loosening of the workpiece. The body has a through hole provided on the axis of / σ, an air supply hole through which cold air can be input and penetrated to the β-beam hole,-an oil injection that can inject pressure oil and penetrate to the through hole, and recover pressure oil and penetrate To the oil return hole of the through hole. The shaft seat is sleeved in the shell hole of the body, and has an outer ring surface around the axis, an outer ring surface disposed opposite the outer ring surface, and can be defined-an inner ring surface of the shaft hole, and a ring provided in the inner ring. The number of inner ring grooves of the surface passes through the outer ring surface to the inner ring groove and corresponds to the guide holes of the gas delivery hole and the oil injection hole, respectively, and one of the outer ring surfaces penetrates to the inner ring surface and corresponds to the back. Oil collecting hole. The rotating shaft unit has a rotating member capable of rotating with respect to the shaft seat and the shaft is disposed in the shaft hole, a driving wheel capable of driving the rotating member to rotate, and a sliding member sleeved in the rotating member along the axis. An actuating seat and an elastic member sleeved between the rotating member and the actuating seat along the axis. The rotating member has a receiving chamber capable of receiving the actuating member and the elastic member, and communicates with the inner ring groove and the receiving chamber. Between the drainage holes between the driving seat and the pressure seat, the driving seat can be displaced in a first direction along the axis, and the flat force of the elastic member can cause the engine seat to be displaced in a second direction when the pressure seat is not under pressure. The collet unit is sleeved in the rotating member, and can be displaced along the axis in the first direction when driven by the detent seat, and the workpiece can be released. Therefore, when the shaft unit is running, cold air can be input to achieve the purpose of oil collection and temperature reduction. When the shaft unit is stopped, pressure oil can be input to achieve the purpose of releasing the workpiece. The function of the present invention is to provide the hydraulic chuck with the function of reducing the thickness of the oil shaft and reducing the thickness of the oil film, so that the hydraulic chuck can produce better processing.
性能。 【貫施方式J 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m較㈣施㈣詳細 5 楚的明白。 rh月 參閱圖2、圖3、圖4及圖5,本發明油屢央頭之第 -較佳實施例可同時雙向央持二工件產生運轉，以達到雙 向加工目的，該油壓夾頭包含一本體1〇、一裝設在該本體 1〇内部的軸座20、-轴設在該軸座2G内部之轉轴單元3〇 10 及-套設在該轉軸單元3G内部且可對卫件產生束夹或鬆 釋之筒夾單元40。 15 該本體10具有一沿一軸線設置的貫孔u、一可輸入 冷空氣且貫通至該貫孔n的輸氣孔12、一可注入壓力油 且貫通至該貫孔11的注油孔13、—可回收壓力油且貫通 至該貫孔11的回油孔14及一裝設在該輸氣孔12中的止 逆閥15。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。 # 20 該軸座20是不可轉動地套設在該本體ι〇之貫孔u 中，並具有一圍繞該轴線的外環面21、一與該外環面21 相背設置且可界定出一軸孔221的内環面22、一環設在該 内環面22的内環槽23、一由該外環面21貫穿至該内環槽 23且對應於該輸氣孔12的第一導孔24 (如圖4所示）、 一由該外環面21貫穿至該内環槽23且對應於注油孔a 之第二導孔25 (如圖3所示）、一由該外環面21貫穿至該 8 592883 内環面22且對應於該回油孔14之集油孔26 (如圖5所 示）。該内環面22凹設有數儲油槽222。 該轉軸單元30具有一可相對於軸座2〇產生轉動且軸 設在該轴孔221中的轉動件31、一可驅動該轉動件31轉 動之驅動輪32、一可沿轴線滑動地套設在該轉動件31中 之掣動座33、一沿軸線套設在該轉動件31與掣動座32之 ίο 15 間的彈性件34、一套設在該轉動件31與軸座2〇之間的套 裱35及二分設在該套環35兩側且套設在該轉動件31與 軸座20之間的軸承36。該轉動件31具有一鄰接於驅動輪 32且可容置掣動件33及彈性件34之容室311、數連通在 内環槽23與容室311之間的引流孔312。該掣動座犯具 有一欲合地套設在該容室311中的活塞部331，該活塞部 331受壓力油所掣動可使掣動座33整體沿軸線朝一第一方 向I產生位移，該彈性件34之彈力可使掣動座犯在未受 壓力油作用時朝-第二方向E位移。該套冑35具有一可 接通在内環槽23與引流孔312之間的油道351。 κ 3 “皁元4〇是套設在該轉動件μ内部，並具有一 螺接在該轉動件31 一側端部上的第-束件41、-連結在 掣動座33上且與第一束件41相反設置的第二束件犯、一 20 套設在該第一束件41内部且可供工件套設的第-筒夾 套⑨在该第二束件42内部且可供X件套設的第二 同夾44及一嵌結在該第一、二筒夾43、“之 45。該第一、二击丛w 干 一 、42各具有一呈推拔狀且可對第 一同夾43、44產生束緊之束夾孔411、421。該連動 9 5 件45與第一、 452。 再如圖3所示，當欲鬆釋或替換工件時，啟動壓力油 自注油孔13中輸人，《力油依輕經第二導孔25、油 道如、引流孔312(如箭頭所示），最終會進入容室311 並對掣動座33之活塞部cm 1 1… 卩331進仃推掣動作（此時該彈性 < 34呈被壓縮狀態城藏回釋之彈力），且使掣動座μ 在朝第:方向1移動時會帶動第二束件42(第二筒夹44 10 隨即呈鬆釋狀態）、第二束件42利用滑動間隙似略微位 移後，又對連動件' Μ 第一埼夾43產生推移，即可使得 15 Η夾43自第-束件41中移出。因此，第_、二筒夹 “、㈣可呈鬆釋，以方便於取出、替換工件。且在此狀 。抑墾力〆由不僅會沿上述路徑流動，更會渗人内環面22 與套％ 35外周面之間、軸承36••等之孔軸配合之縫隙中， 即使會渗人輸氣孔12中，但利用止逆閥15之設置，可防 止壓力油自輸氣孔12流出。 如圖4圖5所示，當關閉壓力油，利用彈性件^ 之彈力:乍用會使掣動座33朝第二方向正產生位移且使第 20 同爽 43、44夕 pq l 44之間均設有一滑動間隙45卜 筒夾43、44漸漸被束緊。當啟動驅動輪32帶動轉 動件31轉動的同時可啟動氣壓源，且使冷空氣通過止逆 、:15而自輪氣孔12輸人，並經第—導孔24之導弓I而可 一軸座20與套環35之間、轴承36内部（如箭頭所 示）’如此一氺 _ , 水’正在運轉之轉軸單元30即可受到空氣的 作用而產生降溫的效果。且更使得原來存在於該等扎軸配 10 592883 合處及儲油槽222中之油膜、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的，且 可減少孔軸配合處之油膜厚度，以使油壓失頭保持較佳之 加工性能。 5 又如圖6所示’本發明第二實施例是適用於單向夾持一 工件產生運轉’且與上述實施例具有相同之本體ι〇,、轴座 20’、轉軸單元3G’等構件，且該本體1()，之供氣通道令亦設 .有—止逆閥（圖未示），本實施例與上述實施例之差異處僅 在於··該筒夾單元40,具有一連結在該轉動件31，上的束件 1〇 4Γ、-套設在該束件41’内部且可供工件套設的筒夾a及 -連結在該筒夾42,與掣動座33,之間的連動件43，。該束件 41,具有一呈推拔狀且可對筒夾42,產生束緊之束夹孔 411’。藉此’該掣動座33,受壓力油作用亦可驅動該連動件 43’、筒夾42，’而使筒夾42，自束件41，中移出以達到鬆performance. [Implementation method J The features and effects of the foregoing and other technical contents of the present invention are described in detail below with reference to 5 details. Refer to Figure 2, Figure 3, Figure 4 and Figure 5 for the first preferred embodiment of the oil-retaining central head of the present invention, which can simultaneously hold two workpieces in both directions to achieve bidirectional processing. The hydraulic chuck includes A body 10, a shaft seat 20 installed inside the body 10, a shaft unit 3010, which is provided inside the shaft seat 2G, and-which is set inside the shaft unit 3G, and can be used for guarding. A collet unit 40 that produces a clamp or release. 15 The body 10 has a through hole u provided along an axis, an air supply hole 12 capable of inputting cold air and penetrating to the through hole n, an oil injection hole 13 capable of injecting pressure oil and penetrating to the through hole 11, -The pressure oil can be recovered and penetrates to the oil return hole 14 of the through hole 11 and a check valve 15 installed in the gas delivery hole 12. The non-return valve 15 is provided to allow cold air to be unidirectionally input into the air supply hole 12 from the outside to the inside, and to prevent the pressure oil from flowing out. # 20 The shaft seat 20 is non-rotatably sleeved in the through hole u of the body ι〇, and has an outer ring surface 21 around the axis, and an outer ring surface 21 opposite to the outer ring surface 21 and can be defined An inner ring surface 22 of a shaft hole 221, an inner ring groove 23 provided in the inner ring surface 22, a first guide hole penetrating from the outer ring surface 21 to the inner ring groove 23 and corresponding to the air delivery hole 12. 24 (as shown in FIG. 4), a second guide hole 25 (as shown in FIG. 3) penetrating from the outer ring surface 21 to the inner ring groove 23 and corresponding to the oil injection hole a, and one from the outer ring surface 21 The oil collecting hole 26 (see FIG. 5) penetrating to the inner ring surface 22 of the 8 592883 and corresponding to the oil return hole 14. The inner annular surface 22 is recessed with a plurality of oil storage grooves 222. The rotating shaft unit 30 has a rotating member 31 capable of rotating relative to the shaft seat 20 and the shaft is provided in the shaft hole 221, a driving wheel 32 capable of driving the rotating member 31 to rotate, and a sleeve capable of sliding along the axis. A trigger seat 33 provided in the rotating member 31, an elastic member 34 sleeved along the axis between the rotation member 31 and the 15 of the trigger seat 32, and a set provided in the rotation member 31 and the shaft seat 2 The sleeve mounting 35 and the two bearings 36 are arranged on both sides of the collar 35 and sleeved between the rotating member 31 and the shaft seat 20. The rotating member 31 has a receiving chamber 311 adjacent to the driving wheel 32 and capable of receiving the actuating member 33 and the elastic member 34, and a plurality of drainage holes 312 communicating between the inner ring groove 23 and the receiving chamber 311. The actuating seat has a piston portion 331 nested in the receiving chamber 311. The actuating of the piston portion 331 by pressure oil can cause the actuating seat 33 as a whole to move along the axis in a first direction I. The elastic force of the elastic member 34 can cause the occupant to be displaced in the second direction E when the pressure is not applied. The sleeve 35 has an oil passage 351 which can be connected between the inner ring groove 23 and the drainage hole 312. κ 3 “The saponin 40 is sleeved inside the rotating member μ and has a first bundle member 41 screwed to the end of one side of the rotating member 31 and connected to the detent base 33 and connected to the first A second collet member disposed opposite to a bundle member 41, and a first collet sleeve set inside the first bundle member 41 and capable of being set by the workpiece are held inside the second bundle member 42 and are available for X The second sleeve 44 and the second sleeve 43 and "Z45" are nested in the piece. Each of the first and second strike bundles w1, 42 has a beam clamping hole 411, 421 which is push-shaped and can tighten the first clamp 43, 44. The linkage 9 5 pieces 45 with the first, 452. As shown in FIG. 3 again, when the workpiece is to be released or replaced, the pressure oil is started from the oil injection hole 13 and the force oil passes through the second guide hole 25, the oil passage such as the drainage hole 312 (as indicated by the arrow). (Shown), will eventually enter the chamber 311 and push the piston cm 1 1… 331 of the actuating seat 33 to push the actuating action (at this time, the elasticity < 34 is in a compressed state, the release force of the city possession), and When the detent seat μ moves in the first direction: 1, the second beam piece 42 (the second collet 44 10 will be released immediately), the second beam piece 42 is slightly displaced by the sliding gap, and then the linkage When the first clip 43 is moved, the 15 clip 43 can be removed from the first bundle 41. Therefore, the first and second chucks can be released to facilitate the removal and replacement of the workpiece. In this case, the restraint force will not only flow along the above path, but will also penetrate the inner torus 22 and In the gap between the outer peripheral surface of the sleeve 35 and the bearing shaft 36, etc., even if it penetrates into the gas delivery hole 12, the use of the check valve 15 can prevent the pressure oil from flowing out of the gas delivery hole 12. As shown in Figure 4 and Figure 5, when the pressure oil is turned off, the elastic force of the elastic member ^ is used: at first use, the detent seat 33 is positively displaced in the second direction and makes the 20th same 43, 44 eve pq l 44 of A sliding gap 45 and collets 43 and 44 are gradually tightened between them. When the start driving wheel 32 drives the rotating member 31 to rotate, the air pressure source can be started, and the cold air passes through the check valve, 15 and the air hole 12 Lost, and through the guide bow I of the first guide hole 24, a shaft unit 30 between the shaft seat 20 and the collar 35 and the inside of the bearing 36 (as shown by the arrow) is 'such a _, water' is running It can be affected by air to produce a cooling effect, and it even makes it exist in the joints and storage of 10 592883 The oil film and oil in the groove 222 can be blown back to the oil collecting hole 26 and the oil return hole 14 'not only can the pressure oil be recovered, but also the thickness of the oil film at the joint of the hole shaft can be reduced to make the oil pressure Loss of head maintains good processing performance. 5 Also shown in FIG. 6 'The second embodiment of the present invention is suitable for one-way clamping and production of a workpiece' and has the same body as the above embodiment, and the shaft seat 20 ', Rotating shaft unit 3G' and other components, and the body 1 (), the air supply channel order is also provided.-Check valve (not shown), the difference between this embodiment and the above embodiment is only ... The collet unit 40 has a bundle member 104i connected to the rotating member 31, a collet a sleeved inside the bundle member 41 'and a workpiece colletable, and a collet 42 connected to the collet 42. And the linking member 43 between the latching seat 33. The bunching member 41 has a push-in shape and can bind the collet 42 to generate a tightening bundle clamping hole 411 '. By this, the latching seat 33. Under the action of pressure oil, the linkage 43 'and the collet 42' can be driven to move the collet 42 from the self-bundling member 41 to loosen
15 釋目的。 A 歸納上述，本發明之油壓夾頭，是利用壓力油作為退 除工件之驅動源，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。 20 ㈣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 範圍及發明說明書内容所作之簡單的等效變化與修飾，皆 應仍屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 11 圖1是現有一種油壓夾頭之組合剖面圖； 圖2是一平面圖，說明本發明油壓央頭的—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 輪送路徑； 圖4是沿圖2中之線4 — 4的一剖面圖，說明冷空氣 之輪送路徑； 圖5疋/〇圖2中之線5〜5的一剖面圖，說明油壓夾 頭内部之油膜受冷空氣吹送作用之收集路徑；及 圖6是本新型油壓夾頭之一第二較佳實施例的一組 合剖面圖。 12 592883 【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 222 儲油槽 23 内環槽 24 第一導孔 25 第二導孔 26 集油孔 30 轉軸單元 31 轉動件 311 容室 312 引流孔 32 驅動輪 33 掣動座 331 活塞部 34 彈性件 35 套環 351 油道 36 軸承 I 第一方向 Π 第二方向 40 筒夾單元 41 第一束件 411 束夾孔 42 第二束件 421 束夾孔 43 第一筒夾 44 第二筒夾 45 連動件 10， 本體 20， 軸座 30， 轉軸單元 31， 轉動件 33， 掣動座 40， 筒夾單元 41， 束件 41Γ 束夾孔 42， 筒夾 43, 連動件 1315 Interpretation purposes. A In summary, the hydraulic chuck of the present invention uses pressurized oil as a driving source for removing the workpiece, and uses cold air to cool the shaft unit during operation and drive away the oil existing in the joints and gaps of the hole shaft. Liquid, which can ensure the processing performance, so it can indeed achieve the purpose of the invention. 20 The above is only a preferred embodiment of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the content of the invention specification of the present invention , All should still fall within the scope of the invention patent. [Brief description of the drawings] 11 FIG. 1 is a sectional view of a conventional hydraulic chuck; FIG. 2 is a plan view illustrating a hydraulic central head of the present invention—a preferred embodiment; FIG. 3 is along the line in FIG. 2 A cross-section view from 3 to 3 illustrates the pressure tanker's delivery path; Figure 4 is a cross-section view along line 4 to 4 from Figure 2 to illustrate the cold air transport path; Figure 5 疋 / 〇 Line 5 in Figure 2 A cross-sectional view of ~ 5 illustrates the collection path of the oil film inside the hydraulic chuck by the blowing of cold air; and FIG. 6 is a combined cross-sectional view of a second preferred embodiment of the new hydraulic chuck. 12 592883 [Brief description of the main components of the figure] 10 Body 11 Through hole 12 Air delivery hole 13 Oil injection hole 14 Oil return hole 15 Check valve 20 Shaft seat 21 Outer ring surface 22 Inner ring surface 221 Shaft hole 222 Oil storage tank 23 Inner ring groove 24 First guide hole 25 Second guide hole 26 Oil collecting hole 30 Rotating shaft unit 31 Rotating member 311 Reservoir 312 Drain hole 32 Driving wheel 33 Actuating seat 331 Piston portion 34 Elastic member 35 Collar 351 Oil passage 36 Bearing I First direction Π Second direction 40 Collet unit 41 First bundle member 411 Bundle clamp hole 42 Second bundle member 421 Bundle clamp hole 43 First collet 44 Second collet 45 Linking member 10, body 20, shaft Seat 30, shaft unit 31, rotating member 33, actuating seat 40, collet unit 41, beam member 41Γ beam clamp hole 42, collet 43, interlocking member 13