200837293 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種滚珠螺桿’特別是指一種散熱塑 滾珠螺桿裝置。 ·、 【先前技術】 參閱圖1，是現有一種廣泛應用於加工機的滾珠螺桿i 該滾珠螺桿1具有一中空的螺桿11、_螺的^ H目，及位於 該螺桿11與該螺帽12之間的多數循環滾珠13。 該螺桿11具有沿其軸線延伸的一内孔丨丨丨，該内孔111 可供一冷卻液（圖未示）流動，以對該滾珠螺桿丨進行冷200837293 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to a ball screw', particularly to a heat-dissipating plastic ball screw device. [Prior Art] Referring to Fig. 1, there is a conventional ball screw i widely used in a processing machine. The ball screw 1 has a hollow screw 11, a screw, and is located at the screw 11 and the nut 12 Most of the recirculating balls 13 between. The screw 11 has an inner bore extending along its axis, and the inner bore 111 is provided for a coolant (not shown) to cool the ball screw
部。該滾珠螺桿1雖可藉該冷卻液進行冷卻，惟，實際運 用時卻有以下缺失： T 當該螺帽12相對該螺桿U滑動時，該等滾珠.ΐ3因與 該螺桿11、螺帽12滾動摩擦而發熱，使該螺桿u與螺帽 12均升溫。一般而言，該螺桿丨丨的長度是遠大於該螺帽二 的長度，所以該螺桿U與該等滚珠13接觸的時間，是遠少 於該螺帽12與該等滚珠13接觸的時間，如此使該螺桿^ T份的時間可藉由與空氣接觸而降溫，因此，熱量大部 伤疋集中於該螺帽12。然而，該冷卻液卻僅於該螺桿1 流動’導致冷卻效果不佳。 >閱圖2，疋現有另一種滾珠螺桿2，該滾珠螺桿2包 =一具有一外螺紋211的螺桿21、一螺帽22，及位於該= 干” ”玄螺巾目22之間的多數循環滾珠23。該螺帽22具右 又體221、一内螺紋222、多數條冷卻流道223，及一間 200837293 隔壁224，該等滾珠23與該内螺紋222、該外螺紋211滾動 摩擦產生的熱，是藉由該間隔壁224間接傳導至位於該冷 卻流道223内的冷卻液，然後由該冷卻液將熱傳導出該螺 帽22。 该滾珠螺桿2雖然可直接對該螺帽22進行散熱，然而 滾動摩擦產生的熱是由該間隔壁224間接傳導，將影響熱 的傳導效率，且若該間隔壁224的厚度太厚，散熱效果將 不盡理想。此外，該滾珠螺桿2必須藉由二側端蓋225搭 配二防漏墊片226封閉該等冷卻流道223 ,藉以將該冷卻液 封閉於該螺帽22内而不滲漏，因此，該滾珠螺桿2的整體 構造也顯得複雜。 【發明内容】 因此，本發明之目的，即在提供一種可以提高冷卻效 果且構造更為簡單而成本更低的散熱型滾珠螺桿裝置。 於是，本發明散熱型滾珠螺桿裝置是藉由一冷卻流體 散熱’該螺桿裝置包含一螺桿、一螺帽單元，及多數顆滾 動體。 該螺桿具有一外螺紋，該螺帽單元具有至少一螺帽體 、一供該螺桿穿伸的容室、至少一連通該容室的冷卻流體 入口，及至少一連通該容室的冷卻流體出口，該螺帽體具 有一圍繞該容室的圍繞壁，該圍繞壁具有一内壁面、一形 成於該内壁面且與該外螺紋相對設置的内螺紋。該等滾動 體是於該容室内位於該螺桿與該螺帽體之間，並與該外螺 紋、該内螺紋滾動接觸，該冷卻流體是圍繞該等濟動體及 200837293 與該等滾動體接觸的該外螺紋、内螺紋，i由該冷卻流體 出口排出。 【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—個較佳實施例的詳細說明中，將可 清楚的呈現。 參閱圖3、4、5’本發明散熱型滚珠螺桿裝置之較佳實 施例包含-螺桿3、-螺帽單元4,及多數顆滚動體卜 該螺桿3具有-外表面3卜及-外螺紋32，該外螺紋 32是由該外表面31徑向朝内凹陷而形成。該螺帽單元*是 供該螺桿3穿伸過，且可沿該螺桿3的軸向相對該螺桿3 移動’該螺帽單元4具有二螺帽體41、—夾設於該等螺帽 體41之間的連接環42、一供該螺桿3穿伸過的容室μ、 -連通該容室43的冷卻流體入口 44、二連通該容室43的 =卻流體出π 45、-連通該容室43且供該螺桿3穿過的第 一開口 46、一連通該容室43且供該螺桿3穿過並與該第一 開口 46相反設置的第二開口 47，及一潤滑油入口 48。 每一螺帽體41具有一圍繞該容室43的圍繞壁4ιι，每 —圍繞壁4U具有-内壁面412、—與該内壁面412相背設 置的外壁面413 ’及-自該内壁面412朝該外壁面413徑向 Pa且與該外螺紋32相對的内螺紋4丨4。該連接環42是連 接於每-螺帽體41的-側而位於該等螺帽體41之間，並 2 一内環面421，及—外環面422。該容室43是由該等 ”目體41的圍繞壁411與該連接環42共同圍繞界定出，並 200837293 可供該螺桿3穿伸過。該冷卻流體入口 45是由該連接環42 的外環面422徑向凹陷貫穿該内環面421而連通該容室43 二該第一、二開口 46、47分別是連通該容室43，並位於該 容室43的兩相反端而供該螺桿3伸出，且該第一、二開口 刀別疋義出該一冷卻流體出口 45。本實施例中，該 滾珠螺桿裝置實質上是一雙螺帽滾珠螺桿裝置，且該連接 環42實質上是該雙螺帽滾珠螺桿裝置的一預壓環。 該等滾動體5是於該滾珠螺桿裝置内循環滾動，且位 於該螺桿3與該螺帽4之間，當該螺帽體41相對該螺桿3 移動時’該等滾動體5是與該螺桿3的外螺紋32、每一螺 帽體4i的内螺紋414滾動接觸。本實施例中，該等滚動體 5曰貫質上是多數顆滾珠，於實際上運用時，該等滾動體$也 是多數顆滚柱（圖未示），此外，該等滾動體5是藉由滾動 體循環孔（圖未示）於該螺帽單& 4内部循環滚動，而該 等滚動體5於該’袞珠螺桿|置内的滾動循環是產業界現有 的技術’本說明書的圖式均未表示循環孔，此處也將不資 述0 將本發明安裝於一加工機（圖未示）後，以一壓力導 管6連接該冷卻㈣人口 44，該壓力導管6的相反端則是 連接於a體供應源（圖未示），$流體供應源可供應一冷 u 7 例中’該冷卻流體7是—冷卻空氣，該流 體供應源是一空氣壓縮機（圖未示）。 當該螺帽單元4 i日料社你1 a 相對該螺杯3移動時，該等滾動體5 同時是於該螺桿3的外螺紋32、每-螺帽體41的内螺紋 8 200837293 414接觸摩擦滾動，並伴隨著熱的產生。該流體供應源所提 供的冷卻流體7經由該壓力導管6，並由該冷卻流體入口 44進入該螺帽單元4的容室43内，且佈滿該等滾動體5、 該外螺紋32、該内螺紋414之間的多數縫隙8。隨著該螺 帽單元4的移動與該等滾動體5的滾動，該冷卻流體7也 隨著該流動，最後，該冷卻流體7由該第一開口 46、第二 開口 47散逸至大氣中本說明書中，該冷卻流體7是以小 黑點示意於圖4、5中。 當該冷卻流體7於該容室43佈滿該縫隙8時，該等滾 動體5、該螺桿3、該螺帽體41產生的熱直接與該冷卻流 體7進行熱交換，將熱傳導至流動中的該冷卻流體7，該冷 卻流體7升溫而該等滾動體5、該螺桿3、該螺帽體41降 溫。最後，升溫的該冷卻流體7自該第一開口 46、第二開 口 47政逸至大氣中，意即自該冷卻流體出口 散逸，該 滾珠螺桿裝置被有效散熱並降溫。本實施例中，若該冷卻 流體源提供更高壓的冷卻空氣，將可加快冷卻空氣流動的 速度’進而提高散熱效果。 經由以上的說明，可再將本發明的優點歸納如下： 一、本發明是直接對該螺帽單元4進行散熱，使該冷 卻流體7直接接觸該等滾動體5、該螺桿3的外螺紋 及每-螺帽體41的内螺紋4U，藉此使該冷卻流體.’7與熱 源進行有效的熱交換，最後，該冷卻流體7再由詨第一 二開口 46、47散逸，相較於習知二產生於該等滾U胃 外螺紋2H、該内螺紋222的熱，必須藉由該_ η的間 200837293 隔壁224間接地與該冷卻流體進行熱交換，本發明可以更 有效率地散熱。 二、 該冷卻流體7是以空氣壓縮機直接由大氣中取得 ，且於熱交換後直接散逸於大氣中而不需循環回收，因此 整體成本低而且易維護。 三、 相較於習知二設置了冷卻流道223，且必須以防漏 墊片226及側端蓋225封閉該冷卻流道223，本發明的構造 相對簡單且成本更低。 值得說明的是，本發明可有以下的設計變化： 一、 本實施例中，該螺帽單元4是具有二顆螺.帽體Μ 於實際運用時’該螺帽單元4可僅採用一顆螺帽體4】， 即是單螺帽滚珠螺桿（見圖6)，而該連接環42是以數顆螺 絲49鎖接於該螺帽體41的―侧邊，本發明也可達成相同 的散熱效果。 二、 本實施例中’該第一、二開口 46、47除了供該螺 桿3穿伸以外，同時也定義為該等冷卻流體出口 45，於實 際運用時，每一圍繞壁411上也可同時設置多數個由該内壁 面412貫穿至該外壁面413的冷卻流體出口 45,用以加快 該冷卻流體7的排出速度。 ' 歸納上述，本發明之散熱型滾珠螺桿裝置，藉由使1 冷卻流體7直接接觸該等滾動體5、該螺桿3的外敎^ ’及該螺帽體41的内螺紋414而將熱傳導至該冷卻流體7 ，再使該冷卻流體7由該等冷卻流體出口 45排出不 有效散熱’且整體構造簡單且成本低，故確實能達到發明 10 200837293 之目的。 惟以上所述者，僅為本發明之較佳實施例而 1 <平父住貫施例而已，當不unit. Although the ball screw 1 can be cooled by the coolant, the actual use has the following disadvantages: T When the nut 12 slides relative to the screw U, the balls ΐ3 and the screw 11 and the nut 12 The friction is generated by rolling friction, and both the screw u and the nut 12 are heated. In general, the length of the screw cymbal is much longer than the length of the nut 2, so the time that the screw U is in contact with the balls 13 is much less than the time that the nut 12 is in contact with the balls 13. Thus, the time of the screw can be lowered by contact with air, and therefore, most of the heat is concentrated on the nut 12. However, the coolant only flows on the screw 1 to cause a poor cooling effect. > Referring to Figure 2, there is another ball screw 2 which has a screw 21 having an external thread 211, a nut 22, and a space between the = dry" Most of the circulating balls 23. The nut 22 has a right body 221, an internal thread 222, a plurality of cooling channels 223, and a 200837293 partition 224. The heat generated by the rolling friction of the balls 23 and the internal thread 222 is The partition wall 224 is indirectly conducted to the coolant located in the cooling flow passage 223, and then the coolant is conducted out of the nut 22 by the coolant. Although the ball screw 2 can directly dissipate the nut 22, the heat generated by the rolling friction is indirectly conducted by the partition wall 224, which will affect the heat conduction efficiency, and if the thickness of the partition wall 224 is too thick, the heat dissipation effect Will not be ideal. In addition, the ball screw 2 must close the cooling channels 223 by the two side end caps 225 and the two leakage preventing gaskets 226, so that the cooling liquid is enclosed in the nut 22 without leaking. Therefore, the ball is closed. The overall construction of the screw 2 also appears complicated. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a heat-dissipating ball screw device which can improve the cooling effect and which is simpler in construction and lower in cost. Thus, the heat-dissipating ball screw device of the present invention dissipates heat by a cooling fluid. The screw device comprises a screw, a nut unit, and a plurality of rolling bodies. The screw has an external thread, the nut unit has at least one nut body, a chamber through which the screw extends, at least one cooling fluid inlet communicating with the chamber, and at least one cooling fluid outlet communicating with the chamber The nut body has a surrounding wall surrounding the chamber, the surrounding wall having an inner wall surface, an internal thread formed on the inner wall surface and disposed opposite the external thread. The rolling elements are located between the screw and the nut body in the chamber, and are in rolling contact with the external thread and the internal thread, and the cooling fluid is in contact with the rolling bodies around the actuators and 200837293 The external thread and the internal thread i are discharged from the cooling fluid outlet. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to Figures 3, 4, and 5', a preferred embodiment of the heat-dissipating ball screw device of the present invention comprises a screw 3, a nut unit 4, and a plurality of rolling elements. The screw 3 has an outer surface 3 and an outer surface. A thread 32 is formed by the outer surface 31 being recessed radially inwardly. The nut unit * is for the screw 3 to pass through and is movable relative to the screw 3 along the axial direction of the screw 3. The nut unit 4 has a second nut body 41, which is sandwiched between the nut bodies a connecting ring 42 between 41, a chamber μ through which the screw 3 passes, a cooling fluid inlet 44 communicating with the chamber 43, two communicating with the chamber 43, but a fluid π 45, communicating with the a chamber 43 and a first opening 46 through which the screw 3 passes, a second opening 47 communicating with the chamber 43 and passing through the screw 3 and opposite to the first opening 46, and a lubricating oil inlet 48 . Each of the nut bodies 41 has a surrounding wall 4 ι surrounding the chamber 43. Each of the surrounding walls 4U has an inner wall surface 412, an outer wall surface 413' disposed opposite the inner wall surface 412, and - from the inner wall surface 412 An internal thread 4丨4 that is radially Pa toward the outer wall surface 413 and faces the external thread 32. The connecting ring 42 is connected to the side of each of the nut bodies 41 and located between the nut bodies 41, and has an inner annular surface 421 and an outer annular surface 422. The chamber 43 is defined by the surrounding wall 411 of the "body 41" and the connecting ring 42 and is inserted around the screw 3. The cooling fluid inlet 45 is external to the connecting ring 42. The annular surface 422 is radially recessed through the inner annular surface 421 to communicate with the chamber 43. The first and second openings 46, 47 are respectively connected to the chamber 43 and are located at opposite ends of the chamber 43 for the screw 3 extending, and the first and second opening cutters do not express the cooling fluid outlet 45. In this embodiment, the ball screw device is substantially a double nut ball screw device, and the connecting ring 42 is substantially Is a pre-compression ring of the double-nut ball screw device. The rolling elements 5 are cyclically rolled in the ball screw device, and are located between the screw 3 and the nut 4, when the nut body 41 is opposite to the When the screw 3 moves, the rolling elements 5 are in rolling contact with the external threads 32 of the screw 3 and the internal threads 414 of each of the nut bodies 4i. In this embodiment, the rolling elements 5 are generally of a majority. Balls, when actually used, these rolling bodies $ are also a plurality of rollers (not shown), this In addition, the rolling elements 5 are cyclically scrolled inside the nut single & 4 by rolling element circulation holes (not shown), and the rolling elements 5 are in the rolling cycle of the 'bead screw| It is an existing technology in the industry. The drawings of the present specification do not indicate a circulation hole. Here, the invention will be installed in a processing machine (not shown), and then connected by a pressure conduit 6 (4). The population 44, the opposite end of the pressure conduit 6 is connected to the a body supply source (not shown), and the fluid supply source can supply a cold u. In the example, the cooling fluid 7 is - cooling air, the fluid supply source Is an air compressor (not shown). When the nut unit 4 i moves to the screw cup 3, the rolling elements 5 are simultaneously the external thread 32 of the screw 3, each- The internal thread 8 200837293 414 of the nut body 41 contacts the friction rolling and is accompanied by the generation of heat. The cooling fluid 7 supplied from the fluid supply source passes through the pressure conduit 6 and enters the nut unit 4 from the cooling fluid inlet 44. Within the chamber 43 and covered with the rolling elements 5, the external thread 32, the internal thread 4 a plurality of slits 8 between 14. With the movement of the nut unit 4 and the rolling of the rolling elements 5, the cooling fluid 7 also follows the flow, and finally, the cooling fluid 7 is made up of the first opening 46, The two openings 47 are dissipated into the atmosphere. In the present specification, the cooling fluid 7 is indicated by small black dots in Figures 4 and 5. When the cooling fluid 7 fills the gap 8 in the chamber 43, the rolling elements 5 The heat generated by the screw 3 and the nut body 41 directly exchanges heat with the cooling fluid 7, and the heat is transmitted to the flowing cooling fluid 7, and the cooling fluid 7 is heated to the rolling elements 5 and the screw 3. The nut body 41 is cooled. Finally, the warmed cooling fluid 7 escapes from the first opening 46 and the second opening 47 to the atmosphere, that is, dissipates from the cooling fluid outlet, and the ball screw device is effectively dissipated and cooled. . In this embodiment, if the cooling fluid source provides a higher pressure of cooling air, the speed of the cooling air flow can be increased to further improve the heat dissipation effect. Through the above description, the advantages of the present invention can be further summarized as follows: 1. The present invention directly dissipates heat to the nut unit 4, so that the cooling fluid 7 directly contacts the rolling elements 5, the external threads of the screw 3, and The internal thread 4U of each nut body 41, whereby the cooling fluid. '7 is effectively exchanged with the heat source. Finally, the cooling fluid 7 is again dissipated by the first two openings 46, 47. It is known that the heat generated by the external U-thread 2H and the internal thread 222 must be indirectly exchanged with the cooling fluid by the partition 224 of the inter-200837293, and the present invention can dissipate heat more efficiently. 2. The cooling fluid 7 is obtained directly from the atmosphere by an air compressor, and is directly discharged into the atmosphere after heat exchange without recycling, so that the overall cost is low and easy to maintain. Third, the cooling flow passage 223 is provided as compared with the conventional one, and the cooling flow passage 223 must be closed with the leakage preventing gasket 226 and the side end cover 225, and the construction of the present invention is relatively simple and cost-effective. It should be noted that the present invention may have the following design changes: 1. In this embodiment, the nut unit 4 has two screws. The cap body 实际 in actual use, the nut unit 4 can only use one The nut body 4] is a single nut ball screw (see FIG. 6), and the connecting ring 42 is locked to the side of the nut body 41 by a plurality of screws 49, and the present invention can achieve the same. heat radiation. 2. In the present embodiment, the first and second openings 46, 47 are defined as the cooling fluid outlets 45, in addition to the screw 3, and in the actual application, each of the surrounding walls 411 can also be simultaneously A plurality of cooling fluid outlets 45 extending from the inner wall surface 412 to the outer wall surface 413 are provided to accelerate the discharge speed of the cooling fluid 7. In summary, the heat-dissipating ball screw device of the present invention conducts heat by directly contacting the first cooling fluid 7 with the rolling elements 5, the outer rim of the screw 3, and the internal thread 414 of the nut body 41. The cooling fluid 7 and the cooling fluid 7 are discharged from the cooling fluid outlets 45 to be inefficiently dissipated, and the overall structure is simple and low in cost, so that the object of the invention 10 200837293 can be achieved. However, the above description is only a preferred embodiment of the present invention and 1 <
申請專利 ▼ w 又六·丨賞飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1疋現有一種滾珠螺桿的局部剖視示意圖，說明 螺桿具有一内孔； 圖2是現有另一種滾珠螺桿的局部剖視示意圖，說明 一螺帽内具有冷卻流道； 圖3是本發明滾珠螺桿一較佳實施例的一立體示意圖 ，說明一螺帽單元具有二螺帽體； 圖4是該較佳實施例的一側面局部剖視示意圖； 圖5是該較佳實施例的一局部放大示意圖，說明一冷 卻流體是佈滿於滾動體、外螺紋及内螺紋之間的縫隙；及 圖6是該較佳實施例的一立體示意圖，說明該螺帽單 元僅具有一螺帽體。 11 200837293 【主要元件符號說明】 3…… •…螺桿 43··… •…容室 31 …*· —外表面 44••… •…冷卻流體入口 32··… •…外螺紋 45····· •…冷卻流體出口 4…… •…螺帽單元 46··… •…第一開口 41 ·♦·.· •…螺帽體 47*"·. •…第二開口 411… •…圍繞壁 48···.. •…潤滑油入口 412… —内壁面 49..·· …·螺絲 413… •…外壁面 5 *····. •…滾動體 414… •…内螺紋 6 * ••… •…壓力導管 42…… •…連接環 7…… •…冷卻流體 421… •…内環面 8…… …·縫隙 422… •…外壞面 12It is still within the scope of the patent of the present invention to apply for a patent. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial cross-sectional view showing a conventional ball screw, illustrating a screw having an inner hole; FIG. 2 is a partial cross-sectional view showing another ball screw of the prior art, illustrating a cooling flow passage in a nut; 3 is a perspective view of a preferred embodiment of a ball screw of the present invention, illustrating a nut unit having a second nut; FIG. 4 is a partial cross-sectional view of the preferred embodiment; FIG. A partially enlarged schematic view of the embodiment, illustrating a cooling fluid being a gap between the rolling element, the external thread and the internal thread; and FIG. 6 is a perspective view of the preferred embodiment, illustrating that the nut unit has only A nut body. 11 200837293 [Description of main component symbols] 3... •...screw 43··... •... chamber 31 ...*· — outer surface 44••... •...cooling fluid inlet 32··... •...external thread 45··· ··•...Cooling Fluid Outlet 4...•...Nut Cap Unit 46··...•...First Opening 41 ·♦···•... Nut Body 47*"·. •...Second Opening 411... •... Surrounding wall 48···.. •...Lubricating oil inlet 412...——Inner wall surface 49..···· Screw 413... •...Outer wall surface 5*·····.... Rolling body 414... •...Internal thread 6 * ••... •...pressure conduit 42... •...connecting ring 7... •...cooling fluid 421... •...inner ring surface 8......·slit 422... •...outer bad surface 12