200823008 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種主轴，特別是指一種具有内藏式 馬達的主轴。 【先前技術】 近十幾年來，由於加工機為了加工易脆的脆性材料及 易變形的橡膠材料，將傳統的主軸改變成具有可高速旋轉 的主軸，利用該主軸可高速旋轉的特性使得加工刀具對脆 性材料或橡膠材料進行高速切削，解決了傳統主軸;易加a 工上述材料的問題。 參閱圖1，一種現有的内藏式馬達主軸，包含有一殼體 Η、一貫通該殼體Π的心軸12、一連接於該心軸12 2端 部121的刀具座13、一連接於該心軸12另一端部122的定 位件14、一組設置於該殼體u内部的定子15、一組設置於 該心軸12並相對應於該定子15的轉子16，及一設置於該 心軸12 —外周圍123的轴承單元17。其中，該轴承單= 17包括一鄰近於該刀具座13的第一軸承群i7i，及一鄰近 該定位塊14的第二軸承群172。 當該主軸經長時間的操作而產生故障之後，因為該主 轴大部份的零組件皆是被封閉於該殼體u内，如此一體化 設計’在維修上，不論是該主軸内部任何一處的故障，都 需要將整支主軸拆卸下來並更換一支新主軸，而無法在操 作現場維修；例如，該軸承單元17的第一袖承群i7i、或 第二軸承群172的磨損，一樣需要在現場整支拆卸、更換 5 200823008 如此&成該主軸在維修成本上的支出沒有縮減的彈性 另外，在拆卸舊主轴之接 ^ _ 罕由之後，原先舊主轴連接於一機台 時校正過的位置精度，蔣合 、會因新主軸與該機台之間的新組 裝與連結而有所誤差，所以雜欲土 * + , 厅乂維修者為確保該主軸的位置精 度’需要再次校正新主轴的位晉 ^ ^ ^ > 干J位置如此，使得該機台的維 修時間增長’而造成停機時生產損失的增加。 【發明内容】 因此本發明之目的，即在提供—種可以分段抽換維 修的主軸 於疋，本發明内藏式馬達主轴，適用於一加工機，並 包含-殼體I/G、-刀座單元、—定位單元，及_聯社單 元；該殼體單元包括一中心軸線；該刀座單元包括一：該 軸線延伸並設置於該殼體單元中的第一心軸，及一連接於 該第一心軸一端部的刀具夾頭，其中，該第一心軸具有一 相反於該刀具夾頭的第一端部；該定位單元包括一:該軸 線延伸並設置於該殼體單元中的第二心軸，.及一介於該第 二心轴與加工機之間的轉接頭，其中，該第二心軸具有一 相反於該轉接頭的第二端部，而該第二端部具有一沿該軸 線方向上與該第一端部相互疊合的長度；該聯結單元包括 一設置於該第一端部的第一卡合部、一設置於該第二端部 的第二卡合部、一沿該殼體一徑向上介於該第一端部與第 二端部之間的襯套件，及多數設置於該襯套件的滾動件， 其中，該第一卡合部是可拆卸地卡合於第二卡合部。 6 200823008 一卡合部與第二卡合部是可拆200823008 IX. Description of the Invention: [Technical Field] The present invention relates to a spindle, and more particularly to a spindle having a built-in motor. [Prior Art] In the past ten years, the processing machine has changed the conventional spindle to have a spindle that can rotate at a high speed in order to process a brittle brittle material and a deformable rubber material, and the spindle can be rotated at a high speed to make a machining tool. High-speed cutting of brittle materials or rubber materials solves the problem of traditional spindles; Referring to FIG. 1, a conventional built-in motor spindle includes a housing Η, a spindle 12 extending through the housing 、, a tool holder 13 coupled to the end 121 of the spindle 12, and a connection thereto. a positioning member 14 of the other end portion 122 of the mandrel 12, a set of stators 15 disposed inside the casing u, a set of rotors 16 disposed on the mandrel 12 and corresponding to the stator 15, and a set at the center Shaft 12 - bearing unit 17 of outer circumference 123. Wherein, the bearing unit = 17 includes a first bearing group i7i adjacent to the tool holder 13, and a second bearing group 172 adjacent to the positioning block 14. After the spindle has been faulty after a long period of operation, since most of the components of the spindle are enclosed in the housing u, the integrated design is in maintenance, whether it is any inside the spindle. The failure of the entire spindle needs to be dismantled and replaced with a new one, and cannot be repaired at the operating site; for example, the wear of the first sleeve group i7i or the second bearing group 172 of the bearing unit 17 is required At the site, the whole disassembly and replacement 5 200823008 is such that the expenditure on the maintenance cost of the spindle is not reduced. In addition, after the old spindle is removed, the original old spindle is corrected when it is connected to a machine. The positional accuracy, Jiang He, will be inaccurate due to the new assembly and connection between the new spindle and the machine, so the miscellaneous soil * + , the hall repairer to ensure the positional accuracy of the spindle 'need to correct the new The position of the spindle is ^ ^ ^ > The position of the dry J is such that the maintenance time of the machine is increased, resulting in an increase in production loss during shutdown. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a spindle that can be replaced and repaired in stages. The built-in motor spindle of the present invention is suitable for use in a processing machine and includes a housing I/G, - a holder unit, a positioning unit, and a joint unit; the housing unit includes a central axis; the holder unit includes: a first mandrel extending from the axis and disposed in the housing unit, and a connection a tool chuck at one end of the first mandrel, wherein the first mandrel has a first end opposite to the tool chuck; the positioning unit includes: the axis extends and is disposed in the housing unit a second mandrel, and a adapter between the second mandrel and the processing machine, wherein the second mandrel has a second end opposite to the adapter, and the The two ends have a length overlapping the first end portion in the axial direction; the coupling unit includes a first engaging portion disposed at the first end portion, and a second engaging portion disposed at the second end portion a second engaging portion, a first end portion and a second portion along a radial direction of the housing Liner member, and the majority of the rolling portion disposed between the bushing member of the member, wherein the first engaging portion is detachably engaged with the second engaging portion. 6 200823008 One card and second card are detachable
修，確實能達到本發明之目的。 本發明之功效在於該第一卡^ 卸地卡合，如此，在運轉時，該7 該疋位單元的第二心軸一起轉動； 元的第一心軸能輿該定仞i ;认隹 【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個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖2,說明本發明内藏式馬達主軸2,適用於一可 供應驅動要件的加工機（圖未示），而驅動要件例如：電力、 冷卻液、壓縮空氣等；本發明内藏式馬達主軸2包含一殼 體單元21、一刀座單元3、一定位單元4、一軸承單元5、 一馬達單元6、一聯結單元7、一液冷單元8(如圖5所示）， 及一氣冷單元9(如圖6所示）。 該设體單元21包括一沿一中心軸線l延伸的圓柱形殼 體周壁211，及一設置於該殼體周壁211並鄰近該刀座單元 3的法蘭212 ;在本實施例中，使用多數螺絲（圖未示）穿過 該法蘭212將該殼體單元21固定於該加工機上。 該刀座單元3包括一沿該軸線L延伸並設置於該殼體 周壁211内的第一心軸31，一圍繞該第一心轴31的刀座内 壁32、一介於該殼體周壁211與刀座内壁32之間的刀座周 壁33，及一連接於該第一心轴31的刀具夾頭34 ;其中， 200823008 該第一心軸3 1具有一齙分” n ^ ^具夹頭34的刀具端部311， 及-相反於該刀具端部311的第一端部312;在本實施例中 ，該刀座周壁33是使用多數螺絲鎖（圖未示）固於該法蘭212 〇 丨7" 4 沿_線L延伸並設置於該殼體 周壁-内的第二心軸41、一圍繞該第二心軸^的定位内 壁42、-，置於該定位内壁42 一外壁面並連接於該殼體周 壁211的定位賤43、一介於該第二心軸41與加工機的轉 接頭44,及一設置於較位周壁Μ的編碼器&立中， 該第二心軸41具有-鄰近該轉接頭44的轉接端部4ιι，及 一相反於該轉接端部411的第二端部412;而該第二端部 412具有-沿該軸線L方向上與該第—端部312相互昼合的 長度，在本實施例中，該第二端部412的内徑大於該第一 端部312的外徑，換句話說，該第—端部312是穿設於該 第二端部412 β ’另外’該定位周壁43是使用多數螺絲（圖 未示）鎖固於該殼體周壁·211。 4車4承单元5包括有一接觸該第一心轴31 —外壁面的 第一軸承群51，及一設置於該第二心軸41 一外壁面的第二 軸承群52 ;其中，該第一軸承群51具有四組沿該軸線乙方 向上分布於該刀座單元3内的第一轴承511，該第二軸承群 52具有_組沿該轴線L方向上分布於該定位單元4内的第 二軸承521。 該馬達單元6包括一環繞固設於該殼體周壁211内的定 子6丨，及一環繞固設於該第一心轴31外周壁313上並介於 200823008 該第一軸承群51與第一端部312之間的轉子62;當電力進 入該定子61後，利用電磁效應可使得轉子62繞該軸線l 南速轉動’並帶動該第一心轴31、第二心軸41高速轉動。 配合參閱圖3、圖4，該聯結單元7包括一設置於該第 一端部312的第一卡合部71、一設置於該第二端部412的 第二卡合部72、一沿該殼體周壁211 一徑向上介於該第一 端部312與第二端部412之間的襯套件73，及多數設置於 该襯套件73的滾動件74。其中，該第一卡合部7丨具有二 凸出於該第一端部312的卡塊711，而該第二卡合部72具 有一朝該第二端部412凹設的卡槽721，該等卡塊711分別 可拆卸地卡合於該等卡槽721，而且，沿該轴線乙方向上， ，等卡塊7U與該等卡槽721之間存在有間隙％;換句話 況，在卡合之後，該等卡塊711與該等卡槽721在沿該軸線 L方向上仍可相對地移動。 士此的认计，疋為了該等心軸3 1、4 1在高速轉動下， /、忒軸承單元5摩擦而造成溫度的上升，會改變該等心軸 41在該轴線L方向上的長度；而在沿該軸線[方向上 該等卡塊7U與該等切721之間存有間隙75，可讓該等 Μ 31 ' 41因溫度變化而產生的長度變化，在該等滾動件 74的導引下，使料卡塊711與料切721沿該轴線l 方向上相對靠近地移動，避免了該等心軸3i、4i的對撞； 反地在/皿度下降的過程中，該等卡塊B丄肖該等卡槽 21則會沿該軸線L方向上相對遠離地移動。 在本實施例中，該第一卡合部71是與第一心轴3ι — 200823008 體成型的製成，所以第一卡合部71與第一心軸31的材質 相同並具有一第一材料彈性係數，而第二卡合部72則是由 具有一第二材料彈性係數的材質製成後再設置於第二心軸 41，如此，利用該第一、第二卡合部71、72的材質分別具 有不同的彈性係數，可使該等卡塊711與該等卡槽721在卡 合時，更容易緊密卡合，且仍可供維修者拆卸維修。另外 ，每一滾動件74各是一顆可朝任意方向轉動並實質上半徑 相同的鋼珠。 值得一提的是，關於該第一 '第二卡合部71、72的凹Repair can indeed achieve the purpose of the present invention. The effect of the present invention is that the first card is snap-fitted, such that, during operation, the second mandrel of the clamping unit rotates together; the first mandrel of the element can determine the setting i; The above and other technical contents, features and effects of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention. Referring to Figure 2, the built-in motor spindle 2 of the present invention is applicable to a processing machine (not shown) that can supply a driving component, such as electric power, coolant, compressed air, etc.; The main shaft 2 comprises a housing unit 21, a holder unit 3, a positioning unit 4, a bearing unit 5, a motor unit 6, a coupling unit 7, a liquid cooling unit 8 (shown in Fig. 5), and an air cooling unit. Unit 9 (shown in Figure 6). The housing unit 21 includes a cylindrical housing peripheral wall 211 extending along a central axis l, and a flange 212 disposed on the housing peripheral wall 211 adjacent to the holder unit 3; in this embodiment, a majority is used. A screw (not shown) is passed through the flange 212 to secure the housing unit 21 to the processing machine. The holder unit 3 includes a first mandrel 31 extending along the axis L and disposed in the peripheral wall 211 of the housing, a seat inner wall 32 surrounding the first mandrel 31, and a peripheral wall 211 of the housing. a peripheral wall 33 of the seat between the inner wall 32 of the seat, and a tool holder 34 connected to the first mandrel 31; wherein, the first mandrel 31 has a minute "n ^ ^ chuck 34" The tool end 311, and - opposite the first end 312 of the tool end 311; in the present embodiment, the seat peripheral wall 33 is secured to the flange 212 by a plurality of screw locks (not shown).丨7" 4 a second mandrel 41 extending along the _ line L and disposed in the peripheral wall of the casing, a positioning inner wall 42 surrounding the second mandrel, and being placed on an outer wall surface of the positioning inner wall 42 and a positioning port 43 connected to the peripheral wall 211 of the casing, a joint 44 interposed between the second mandrel 41 and the processing machine, and an encoder & center disposed on the outer peripheral wall, the second mandrel 41 has a transfer end 4 ι adjacent to the adapter 44 and a second end 412 opposite the transfer end 411; and the second end 412 has - along the axis L In the present embodiment, the inner diameter of the second end portion 412 is larger than the outer diameter of the first end portion 312, in other words, the first end portion 312. It is disposed at the second end portion 412 β 'other'. The positioning peripheral wall 43 is locked to the peripheral wall 211 of the housing by using a plurality of screws (not shown). The 4 car 4 bearing unit 5 includes a contact with the first center. a first bearing group 51 of the outer wall surface, and a second bearing group 52 disposed on an outer wall surface of the second mandrel 41; wherein the first bearing group 51 has four groups distributed along the axis B in the direction a first bearing 511 in the holder unit 3, the second bearing group 52 has a second bearing 521 distributed in the positioning unit 4 along the axis L. The motor unit 6 includes a surrounding fixing a stator 6丨 in the peripheral wall 211 of the casing, and a rotor 62 surrounding the outer peripheral wall 313 of the first mandrel 31 and interposed between the first bearing group 51 and the first end portion 312 of 200823008; When electric power enters the stator 61, the electromagnetic effect can be used to rotate the rotor 62 about the axis l at a south speed and drive the first The spindle 31 and the second spindle 41 are rotated at a high speed. Referring to FIG. 3 and FIG. 4, the coupling unit 7 includes a first engaging portion 71 disposed at the first end portion 312, and a second end portion disposed at the second end portion. a second engaging portion 72 of the 412, a bushing member 73 radially interposed between the first end portion 312 and the second end portion 412 along the peripheral wall 211 of the housing, and a plurality of rolling portions disposed on the bushing member 73 The first engaging portion 7 has two latches 711 protruding from the first end portion 312, and the second engaging portion 72 has a card recessed toward the second end portion 412. a slot 721, the card blocks 711 are detachably engaged with the card slots 721, respectively, and along the axis B, there is a gap between the card block 7U and the card slots 721; In other words, after the snapping, the blocks 711 and the card slots 721 are still relatively movable in the direction along the axis L. In view of the above, in order for the mandrels 3 1 and 4 1 to rotate under high speed, the bearing unit 5 is rubbed to cause a temperature rise, which changes the direction of the mandrels 41 in the direction of the axis L. a length; and a gap 75 between the blocks 7U and the cut 721 along the axis [the direction allows the length of the Μ 31 '41 to change due to temperature changes in the rolling elements 74 Under the guidance, the material block 711 and the material cutting 721 are moved relatively close to each other in the direction of the axis l, thereby avoiding the collision of the mandrels 3i, 4i; in the process of decreasing the degree of the dish, The card slots B are moved relatively far apart in the direction of the axis L. In this embodiment, the first engaging portion 71 is formed integrally with the first mandrel 3 ι - 200823008, so the first engaging portion 71 is the same material as the first mandrel 31 and has a first material. The second engaging portion 72 is made of a material having a second material elastic coefficient and then disposed on the second mandrel 41. Thus, the first and second engaging portions 71 and 72 are utilized. The materials have different elastic coefficients, so that the card blocks 711 and the card slots 721 can be more easily engaged when they are engaged, and can still be disassembled and repaired by the maintenance person. Further, each of the rolling members 74 is a steel ball which is rotatable in any direction and has substantially the same radius. It is worth mentioning that the concave of the first 'second engaging portion 71, 72
凸配合，也可以是該第一卡合部71具有朝該第一端部3D 凹設的二卡槽，該第二卡合部72具有二凸出於該第二端部 412的卡塊。 參閱圖5,該液冷單元8包括一入液口 81、一環繞該 刀座周壁33並由該刀座周壁33與殼體周壁211配合界定出 的刀座液冷槽道82、一環繞該定子61 一外周壁611並由該 定子61外周壁611與殼體周壁211配合界定出的定子液冷 槽道83、一出液口 84,及一依序串連該入液口 81、刀座液 冷槽道82、定子液冷槽道83、出液口 84的液冷流道85 ; 利用冷卻液在上述槽道82、83之間的流動，帶走該第一、 第二心軸31、41高速轉動時，與該軸承單元5各軸承5ιι 、521之間摩擦產生的熱量，用於降低整個主軸2的溫度。 參閱圖6,該氣冷單元9包括一在該刀座單元3中流動 的刀座氣冷管路91，及一在該定位單元4中流動的定位氣 冷管路92;其中，該刀座氣冷管路91具有一入氣口 9ιι二 10 200823008 一環繞該刀座内壁32並由該刀座内壁32與刀座周壁33配 合界定出的刀座氣冷槽道912、一排氣口 913,及一依序串 連該入氣口 911、刀座氣冷槽道912、及排氣口 913的刀座 氣冷流道914;而該定位氣冷管路92具有一入氣口 921、 一環繞該定位内壁42並由該定位内壁42與定位周壁43配 合界定出的定位氣冷槽道922、一排氣口 923,及一依序串 連該入氣口 921、定位氣冷槽道922、及排氣口 923的定位 氣冷流道924。 本發明的設計是導引壓縮空氣直接流入到環繞上述内 壁32、42的該等氣冷槽道912、922，以最靠近該第一、第 二心軸31、41及各軸承511、521的距離來帶走摩擦產生的 熱量，達成有效率的冷卻效果。 參閱圖4、圖7，當本發明内藏式馬達主軸2故障需要 更換維修時，維修者先進行故障點診斷，確認該故障點是 位在該刀座單元3或者定位單元4，如故障點是發生在該刀 座單元3或者固設於該刀座單元3上的零組件時，維修者 首先將該刀座周壁33鎖固於該法蘭212的多數螺絲（圖未示 )拆卸，再沿該軸線L方向施力於該刀座單元3用以抽離， 4到該第卡合部71卡塊711與第二卡合部72卡槽721沿 該軸線L方向分離之後，該刀座單元3便可從該殼體單元 1中抽出，稍後，維修者再將新的刀座單元3插入該殼體 單7G 21中並沿該軸線L方向施力，待該第一卡合部π卡 塊711與第二卡合部72卡槽721沿該軸線l方向卡合之後 再使用多數螺絲將新的刀座單元3鎖固於該法蘭212，如 11 200823008 此’即完成分段抽換維修的動作。 =，如故障點是發生在該定位單元4或者固設於該 早疋4上的零組件時，其分段抽換維修的動作，除了 需要對該轉接頭44、電力、遷縮空氣等與該加 ㈣ ⑽料連接進行額㈣㈣，其Μ與上料生於刀座 早7C 3的狀況相同。 值得-提的是，由於本發明的聯結單元7襯套件73上 設置有實質上半徑相同的多數滚動件74,可對第一端部 312及第二端部412提供良好的同心定位；如此，維修者對 =中一個單㈣段抽換維修之後’可利用未抽換維修並保 原有位置精度的另-個單元，及該等滾動件74在卡 :提供良好的同心定位’達到組裝後不必再進行位置❹ 校正的優點。 又 歸納上述，本發明内藏式馬達主軸2利用分別設置於 第-、第二心軸3卜41的第一、第二卡合部71、 成 分段抽換維修，節省維修成本的目的，另外在該概套件乃 與該等滾料74的導引下，抽換祕㈣單元不必再打 位置精度的校正，確實能達到本發明之目的。 丁 惟以上所述者’僅為本發明之較佳實施例而已，當 能以此限定本發明實施之範圍’即大凡依本發明中請: 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。 白 【圖式簡單說明】 圖1疋現有種内藏式馬達主軸的一組合示意圖； 12 200823008 圖2是-一較佳實施例 圖3是-的一聯結單元 圖4是- 元； 圖5是- 元； 圖6是一 元，及 圖7是_ 元與一定位單） 組合示意圖，說明本發明内藏式馬達主軸的 j 局部放大的剖視示意圖，說明該較佳實施例 ， 立體分解圖，說明該較佳實施例的該聯結單 組合示意圖，說明該較佳實施例的一液冷單 組合示意圖，說明該較佳實施例的一氣冷單 分解示意圖，說明該較佳實施例的一刀座單 :，從一殼體單元内脫離後的狀態。 13 200823008 【主要元件符號說明】 2…… …·主軸 521 - 21 …·. •…殼體單元 6 •… 211… •…殼體周壁 61 ···· 212… •…法蘭 6U ·· 3…… …·刀座單元 62.··· 31 ·…· •…弟 心軸 7 ····· 311 •…刀具端部 71 ···· 312… •…第一端部 711 ·· 32"·*· …·刀座内壁 72···· 33*·… …·刀座周壁 721 ·· 34 •… •…刀具夾頭 73···. 4…… •…定位單元 74···· 41 •…· •…第二心軸 75···· 4H… •…轉接端部 8 ••… 412… •…第二端部 81…· 42•…· •…定位内壁 82···· 43··.·· …·定位周壁 83···· 44*·… •…轉接頭 84·… 45····· …·編碼器 85···· C * · * « ♦零 Q ..... •…罕由不早兀 51 ·… •…第 軸承群 91 ·… 511 - •…第 軸承 911 * 52·…· …·第二軸承群 912 - 第二軸承 馬達單元 定子 外周壁 轉子 聯結單元 第一卡合部 卡塊 第二卡合部 卡槽 襯套件 滾動件 間隙 液冷單元 入液口 刀座液冷槽道 定子液冷槽道 出液口 液冷流道 氣冷單元 刀座氣冷管路 入氣口 刀座氣冷槽道 14 200823008 913… •…排氣口 922… •…定位氣冷槽道 914… •…刀座氣冷流道 923… •…排氣口 92"… •…定位氣冷管路 924… •…定位氣冷流道 921… …·入氣口 L…… …·軸線 15The first engaging portion 71 has two latching grooves recessed toward the first end portion 3D, and the second engaging portion 72 has two latches protruding from the second end portion 412. Referring to FIG. 5, the liquid cooling unit 8 includes a liquid inlet 81, a knife-cooling channel 82 surrounding the peripheral wall 33 of the holder and being defined by the peripheral wall 33 of the holder and the peripheral wall 211 of the housing. a stator liquid cooling channel 83 and a liquid outlet 84 defined by the outer peripheral wall 611 of the stator 61 and the outer peripheral wall 611 of the stator 61 and the outer peripheral wall 211 of the casing 61, and the liquid inlet 81 and the tool holder are serially connected in series. The liquid cooling channel 82, the stator liquid cooling channel 83, and the liquid cooling channel 85 of the liquid outlet 84; the first and second mandrels 31 are carried away by the flow of the coolant between the channels 82, 83. When the 41 is rotated at a high speed, the heat generated by the friction between the bearings 5 and 521 of the bearing unit 5 is used to lower the temperature of the entire main shaft 2. Referring to FIG. 6, the air cooling unit 9 includes a seat air cooling line 91 flowing in the seat unit 3, and a positioning air cooling line 92 flowing in the positioning unit 4; wherein the seat The air-cooling pipeline 91 has an air inlet port 9 ι ι 10 200823008. A knife air-cooling channel 912 and an air outlet 913 defined by the inner wall 32 of the tool holder and defined by the inner wall 32 of the tool holder and the peripheral wall 33 of the tool holder. And sequentially connecting the air inlet 911, the knife air cooling channel 912, and the air outlet 914 of the air outlet 913; and the positioning air cooling circuit 92 has an air inlet 921, a surrounding Positioning the inner wall 42 and positioning the air cooling channel 922, an exhaust port 923 defined by the positioning inner wall 42 and the positioning peripheral wall 43, and sequentially connecting the air inlet 921, the positioning air cooling channel 922, and the row The gas port 923 is positioned to the air-cooled flow passage 924. The design of the present invention directs compressed air to flow directly into the air-cooling channels 912, 922 surrounding the inner walls 32, 42 to be closest to the first and second mandrels 31, 41 and the bearings 511, 521. The distance to take away the heat generated by the friction to achieve an efficient cooling effect. Referring to FIG. 4 and FIG. 7, when the built-in motor spindle 2 of the present invention needs to be replaced and repaired, the repairer first performs a fault point diagnosis to confirm that the fault point is located in the tool holder unit 3 or the positioning unit 4, such as a fault point. When the tool holder unit 3 or the component fixed on the tool holder unit 3 is generated, the repairer first disassembles the plurality of screws (not shown) that lock the peripheral wall 33 of the tool holder to the flange 212, and then disassembles. Applying the force to the holder unit 3 in the direction of the axis L for pulling out, 4, after the first engaging portion 71 block 711 and the second engaging portion 72 are engaged in the direction of the axis L, the holder The unit 3 can be withdrawn from the housing unit 1. Later, the repairer inserts the new holder unit 3 into the housing unit 7G 21 and applies force in the direction of the axis L until the first engaging portion After the π-block 711 and the second engaging portion 72 are engaged in the direction of the axis l, the new block unit 3 is locked to the flange 212 by using a plurality of screws, such as 11 200823008 Replace the maintenance action. = If the fault point is a component that occurs in the positioning unit 4 or the component fixed on the early 4, the operation of the segmentation replacement maintenance, in addition to the need for the adapter 44, power, retracted air, etc. It is connected with the (4) (10) material to carry out the amount (4) (4), and the Μ is the same as the case where the material is produced in the knife seat 7C 3 earlier. It is worth mentioning that since the plurality of rolling members 74 having substantially the same radius are provided on the bushing member 73 of the coupling unit 7 of the present invention, the first end portion 312 and the second end portion 412 can be provided with good concentric positioning; After the repairer has replaced one of the single (four) segments, the other units that can be used for unrepaired maintenance and maintain the original positional accuracy, and the rolling elements 74 are provided in the card: providing good concentric positioning' after assembly It is no longer necessary to perform the position 校正 correction. In addition, as described above, the built-in motor spindle 2 of the present invention is replaced by the first and second engaging portions 71 and the component sections respectively provided on the first and second spindles 41, thereby saving maintenance costs. Under the guidance of the kit 74, the replacement of the secret (4) unit does not require correction of the positional accuracy, and the object of the present invention can be achieved. The above description is only a preferred embodiment of the present invention, and can be used to limit the scope of the practice of the present invention, i.e., in accordance with the present invention: a simple equivalent change between the scope and the description of the invention Modifications: Within the scope of the patents of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a combination of a conventional built-in motor spindle; 12 200823008 FIG. 2 is a preferred embodiment. FIG. 3 is a coupling unit. FIG. 4 is a - element; Figure 6 is a combination of a unitary unit, and Figure 7 is a combination of a unit and a positioning unit, illustrating a partially enlarged cross-sectional view of the built-in motor spindle of the present invention, illustrating the preferred embodiment, an exploded perspective view, A schematic diagram of the joint single assembly of the preferred embodiment is illustrated, and a schematic diagram of a liquid cold single assembly of the preferred embodiment is illustrated. A schematic diagram of an air cooled single exploded view of the preferred embodiment is illustrated, and a single seat of the preferred embodiment is illustrated. : The state after detachment from a housing unit. 13 200823008 [Description of main component symbols] 2...... ...· Spindle 521 - 21 ...·. •...Shell unit 6 •... 211... •...Shell peripheral wall 61 ···· 212... •...Flange 6U ·· 3 ...... .... knife base unit 62.··· 31 ·...· •... brother spindle 7 ····· 311 •...tool end 71 ···· 312... •...first end 711 ·· 32" ;·*· ...·The inner wall of the knife holder 72···· 33*·... The seat wall 721 ·· 34 •... •...tool chuck 73···. 4...... •...positioning unit 74··· · 41 •...· •...Second mandrel 75···· 4H... •...Transfer end 8 ••... 412... •...Second end 81...· 42•...· •...Locating inner wall 82·· ·· 43·······Locating the perimeter wall 83···· 44*·... •...Adapter 84·... 45·······Encoder 85···· C * · * « ♦ Zero Q ..... •...Rarely not early ·51 ·... •...bearing bearing group 91 ·... 511 - •...bearing bearing 911 * 52·...·...second bearing group 912 - second bearing motor unit Stator outer peripheral rotor coupling unit first engagement Part block second engaging part card slot bushing rolling element clearance liquid cooling unit inlet port knife seat liquid cooling channel stator liquid cooling channel outlet liquid cooling channel air cooling unit knife seat air cooling pipe inlet Seat air cooling channel 14 200823008 913... •...Exhaust port 922... •... Positioning air cooling channel 914... •...Knife air cooling channel 923... •...Exhaust port 92"... •... Positioning air cooling tube Road 924... • Position air-cooled runner 921...·Inlet port L... ...·axis 15