201024573 六、發明說明： 【發明所屬之技術領域】 本發明係為一種滾珠螺桿之迴流元件，尤指外置 ^ 式迴流元件的滾珠螺桿。 【先前技術】 如美國專利公告第64_2號糊案，其係揭露 -螺帽1 0 ’該螺帽i 〇的外圍設有一個以上的切槽 30(40) »亥切槽3〇(4〇)係裝有供複數滾動 件循環之轉向元件3 2 ( 3 4 )，該轉向元件32 (3 4)係透過平行該螺帽1 〇軸向之固定元件7 2 (7 4)將其固定於螺帽1〇上。但此設計有—問題點， ❹201024573 VI. Description of the Invention: [Technical Field of the Invention] The present invention relates to a reflow element of a ball screw, and more particularly to a ball screw of an external reflow element. [Prior Art] As disclosed in U.S. Patent Publication No. 64-2, it is disclosed that the nut 10 ' is provided with more than one slot 30 (40) on the periphery of the nut i » » Haicha slot 3 〇 (4〇 a steering element 3 2 ( 3 4 ) for circulating a plurality of rolling elements, the steering element 32 (34) being fixed to the fixing element 7 2 (7 4) parallel to the axial direction of the nut 1 The nut is on the top. But this design has - problem points, ❹
如要放置間隔子（間隔子係設至於滾動件之間，其設 置目的係使滾動件之間減少碰撞情形產生）時該轉向 70件3 2 ( 3 4 )之循環路徑6 4的f曲路徑之曲率 半徑須增大（因為_子運行至f祕徑時，該間隔 子會向曲率半簡小的壁面位移，故需將該避面的曲 率半t增大，Μ防止間隔子與該壁面產生干涉），這樣 f使該間隔子順利通過轉角部份，而如無將轉角曲 大則間隔子會與_路徑6 4產生干涉，故對 、、相同規袼的料螺桿來說，如要增設間隔子則該轉 向70件3 2 ( 3 4 )之猶環路徑64的轉角曲率須增 3 201024573 大，相對的該轉向元件3 2 (3 4)之體積也會增大， 而該切槽也須配合增大，此時則會將靠近該切槽之部 份牙溝2 6切除而形成不完整的牙型，使滾動件無法 - 運行此區段的牙溝2 6，簡言之，此設計之係不能供 • 設有間隔子之滾珠螺桿使用；故該習知技術仍有進一 步改良之必要。 【發明内容】 基於上述習知技術之問題點，本發明人經過研究 改良後’終有確能達成以下發明之目的之發明誕生。 即，本發明首要目的在於，設計一種能供間隔子 設置之外置式迴流元件之滾珠螺桿。 為達上述之目的’本發明係為一種外置式迴流元 件之滾珠螺桿，係包含： 一桿軸，係為長條狀，其外緣係設有一滾動溝； 一螺帽，其設有一供該桿軸穿設之穿孔，該穿孔 内緣係設有相對該滾動溝之滾動槽’該滾動溝及滾動 槽係構成一負荷路徑，且該螺帽另設有一軸向延伸之 迴流孔，及於外徑係設有二個以上之容置結構，該容 置結構係包含：一個以上之承靠面、一容置孔及凹槽， 該承靠面係設置於該容置孔及凹槽兩側並與其相連 通，且3亥承靠面上係設有一個以上之固定孔，該容置 201024573 孔係由該螺帽徑向延伸至該穿孔並與該負荷路徑相切 銜接，而該容置孔與該負荷路徑相切銜接的好處在於 可避免該容置孔與相鄰之滚動槽產生干涉，該凹槽係 為一弧形結構，其一端與該容置孔銜接，另一端與該 迴流孔銜接； m 一迴流組件，係容設於該容置結構中，其包含： 二迴流元件、定位件及固定件；其中該迴流元件係由 第一元件及第二元件所構成，該第一元件與第二元件 各設有相對之接合面及半迴流道，該接合面係設有定 位構件，該定位構件係能相互卡合，使該第一元件及 第二元件組合成該迴流元件，而兩該半迴流道係構成 一迴流道，而該迴流元件係區分為銜接部及弯曲部， 該銜接部係插設於該容置孔中，使該迴流道之一端與 該負荷路徑相連接，該彎曲部係容置於該凹槽中，且 該彎曲部之彎曲面係與該凹槽貼合，使該迴流道之另 ❿ 一端與該迴流孔連接而構成一完整的循環路徑；該定 位件係提供該迴流元件定位用，其係蓋設於該迴流元 « 件之上方，該定位件係設有一定位凹部及位於該定位 ·· 凹部兩侧之翼部，該定位凹部與該彎曲部所設之上表 面對合，該翼部係承靠於該承靠面，其上設有與該固 定孔相對之通孔；該固定件係穿設該通孔後與該固定 孔配合定位，將該定位件固定於該承靠面上，並使該 5 马求滑楚說明本發明 ❿ φ 201024573 定位件壓制固定該迴流元件； 複數滾動件，係裝設於該循環路針，其作為該 桿軸與螺帽之間的傳動介質；另外，該滾動件之間Ϊ 可裝設間隔子’使該滾動件之間不會產生碰撞，而該 間隔子係為塑膠材質製成。 明較習用進步之處及實用方式： 本發明之螺帽因設有該軸向之迴流孔，所以該堤 流孔須與該_之滾_具有—安全壁厚，以保持該 滾動槽之剛性；而對於相同規格之滚珠螺桿因不滾動 中之尺寸 <疋否有加人間隔子，都會使該迴流元件 之迴流道的曲率半徑加大或縮小；而針對須加大迴流 道之曲率半㈣㈣元縣說，會使得該料部之外 型尺切加，相對該凹槽之曲率半徑也會增加，故本 發月可藉由該安全壁厚來調整該凹槽之曲率半徑，使 該迴流元件W胁财纽相射1本發明因 為有安全壁厚的設計，使該凹槽不與該滚動槽產生干 :於ΓΓ會降低螺帽整體的剛性，且此技術最適合應 ^寸1動件、小導程之負荷路徑及裝設有間 β之滾珠螺桿’這也是f知技術無法突破的問題點。 201024573 為了更進一部瞭解本發明之特徵及技術内容，請 參閱以下有關本發明之實施方式說明及圖式，然而此 實施方式及圖式僅供說明及參考用，而非用以對本發 明做任何限制者。 【實施方式】 請參閱第一圖至第四圖、第五A、B圖及第六至 參八圖所示，本發明係為一種外置式迴流元件之滾珠螺 桿，係包含： 一桿軸1，係為長條狀，其外緣係設有一滾動溝 11; 一螺帽2 ’其設有一供該桿軸1穿設之穿孔2 1，該穿孔2 1内緣係設有相對該滾動溝丄2之滾動 槽2 1 1，該滚動溝1 1及滾動槽2丄丄係構成一負 ❹ 街路徑6 0，且該螺帽2另設有一軸向延伸之迴流孔 2 3，及於外徑係設有二個以上之容置結構2 2，該 . 容置結構2 2係包含：一個以上之承靠面2 2 1、一 • 谷置孔2 2 2及凹槽2 2 3 ,該承靠面2 2 1係設置 於該容置孔2 2 2及凹槽2 2 3兩側並與其相連通， 且該承靠面2 2 1上係設有一個以上之固定孔2 2工 1，5亥容置孔2 2 2係由該螺帽2徑向延伸至該穿孔 2 1並與該負荷路徑6 〇相切銜接（如第六、七圖所 7 201024573 示’該容置孔2 2 2係完全與該負荷路徑6 0相切）， 而該容置孔2 2 2與該負荷路徑6 0相切銜接的好處 在於可避免該容置孔2 2 2與相鄰之滾動槽2 1 1產 - 生干涉；附帶一提的是，對於該容置孔2 2 2與該負 . 荷路徑6 0完全相切的部份，如以三軸以上之加工機 來加工是很好加工的，但如以傳統三軸加工機來加工 是不好加工的；故本發明對於傳統三軸加工機係提供 ❿ 一種較好加工的容置孔2 2 2結構（以下請參閲第十 圖）’於該容置孔2 2 2與該凹槽2 2 3銜接之一侧係 為第一表面2221，與該第一表面2221之相對 之面為第二表面2222，而特徵在於該第一表面2 2 2 1係不與該負荷路徑6 〇相切，而第二表面2 2 22則與該負荷路徑60相切，如此-來藉由傳統的 三軸加工機來加工，其刀具7 0之路徑7 〇 χ只要垂 ❾ 直（註：與螺帽之轴心垂直）下刀將部分的容置孔2 2 2成型後’在斜向提刀，而提刀的角度係等於該螺 • 冑2之滚動槽2 1 1之導程角之角度，藉此即可快速 完成加工，以提升機台加工的通用性並加速生產速 度；該凹槽223係為一弧形結構，其一端與該容置 孔2 2 2銜接，另一端與該迴流孔23銜接，且該凹 槽2 2 3之係與該螺帽2之轴心平行設置； 一迴流組件3 ’係容設於該容置結構2 2中，其 201024573 包含：二迴流元件3 1、定位件3 2及固定件3 3 ; 其中該迴流元件3 1係由第一元件3 1A及第二元件 3 1B所構成’該第一元件3 1A與第二元件3 1B 各設有相對之接合面3 1 2A、3 1 2B及半迴流道If the spacer is to be placed (the spacer is set between the rolling elements, the purpose of which is set to reduce the collision situation between the rolling elements), the f-curve path of the cyclic path 6 4 of the steering 70 piece 3 2 ( 3 4 ) The radius of curvature must be increased (because the _ sub-run to the f-path, the spacer will be displaced toward the wall with a semi-simplified curvature, so the curvature of the avoidance surface is increased by half t, and the spacer and the wall are prevented. Interference is generated, so that f allows the spacer to pass through the corner portion smoothly, and if the corner is not large, the spacer will interfere with the _path 64, so that the same screw of the same gauge should be When the spacer is added, the corner curvature of the heave ring path 64 of the 70 pieces of 3 2 (3 4 ) must be increased by 3 201024573, and the volume of the opposite steering element 3 2 (3 4) is also increased, and the slot is increased. It must also be increased, in which case some of the sulcus close to the kerf is cut off to form an incomplete tooth shape, so that the rolling element cannot be operated - the sulcus of the segment is 2, in short, This design is not available for use with a ball screw with spacers; therefore, this prior art still has further Yoshiyuki necessary. SUMMARY OF THE INVENTION Based on the problems of the above-described conventional techniques, the inventors of the present invention have been researched and improved, and the invention which can achieve the object of the following invention is born. That is, the primary object of the present invention is to design a ball screw capable of providing an external reflow element with a spacer. In order to achieve the above purpose, the present invention relates to a ball screw of an external reflow element, comprising: a shaft having an elongated shape with a rolling groove on an outer edge thereof; and a nut provided with a a through hole extending through the shaft, the inner edge of the through hole is provided with a rolling groove relative to the rolling groove. The rolling groove and the rolling groove form a load path, and the nut is further provided with an axially extending return hole, and The OD is provided with two or more accommodating structures, and the accommodating structure comprises: one or more bearing surfaces, a receiving hole and a groove, wherein the bearing surface is disposed in the accommodating hole and the groove The side is connected to the side, and the mounting surface of the 3H is provided with more than one fixing hole, and the receiving hole of the 201024573 is radially extended from the nut to the through hole and is tangentially connected to the load path, and the capacity is The advantage of the tangential engagement of the hole with the load path is that the accommodating hole can be prevented from interfering with the adjacent rolling groove. The groove is an arc-shaped structure, one end of which is connected with the accommodating hole, and the other end is connected with the other end. The return hole is connected; the m-reflow component is disposed in the receiving junction The structure comprises: two reflow elements, a positioning member and a fixing member; wherein the reflow element is composed of a first element and a second element, the first element and the second element are respectively provided with opposite joint faces and a half reflow The locating surface is provided with positioning members which are engageable with each other such that the first element and the second element are combined into the reflow element, and the two return flow paths form a return flow, and the reflow The component is divided into an engaging portion and a bent portion, and the engaging portion is inserted into the receiving hole, so that one end of the return channel is connected to the load path, and the bent portion is received in the groove, and the The curved surface of the curved portion is adhered to the groove, and the other end of the return passage is connected with the return hole to form a complete circulation path; the positioning member provides the reflow element for positioning, and the cover is provided for Above the reflow element, the positioning member is provided with a positioning concave portion and a wing portion on both sides of the positioning and recessing portion, the positioning concave portion is opposite to the upper surface of the curved portion, and the wing portion is supported by the wing portion. On the bearing surface, on a through hole opposite to the fixing hole; the fixing member is inserted through the through hole and is engaged with the fixing hole to fix the positioning member on the bearing surface, and the present invention is illustrated φ φ 201024573 The positioning member presses and fixes the reflow element; the plurality of rolling elements are mounted on the circulation needle as a transmission medium between the shaft and the nut; in addition, the spacing between the rolling elements can be arranged The child's make no collision between the rolling elements, and the spacer is made of plastic material. The advantages and practical ways of the prior art: Since the nut of the present invention is provided with the axial return hole, the impeller should have a safety wall thickness with the roll to maintain the rigidity of the rolling groove. And for the same size of the ball screw due to the size of the non-rolling < 疋 no adding spacers, will increase or decrease the radius of curvature of the return channel of the reflow element; and for the curvature of the return channel must be increased half (four) (four) Yuan County said that the outside of the material part will be cut, and the radius of curvature of the groove will increase. Therefore, the radius of curvature of the groove can be adjusted by the safety wall thickness to make the reflow. The component W threats the coin phase. The invention has a safe wall thickness design, so that the groove does not dry with the rolling groove: the ΓΓ 降低 reduces the rigidity of the overall nut, and the technology is most suitable for the inch 1 The moving parts, the load path of the small lead, and the ball screw equipped with β are also the problems that cannot be broken by the knowing technology. In order to further understand the features and technical contents of the present invention, reference should be made to the following description of the embodiments of the present invention and the drawings. Limiter. [Embodiment] Referring to Figures 1 to 4, 5A, B, and 6 to 8, the present invention is a ball screw of an external reflow element, comprising: a shaft 1 The outer edge is provided with a rolling groove 11; a nut 2' is provided with a through hole 2 for the shaft 1 to pass through, and the inner edge of the through hole 2 1 is provided with respect to the rolling groove The rolling groove 1 1 1 and the rolling groove 2 1 constitute a negative street path 60, and the nut 2 is further provided with an axially extending return hole 2 3 , and The outer diameter is provided with two or more accommodating structures 2 2 , and the accommodating structure 2 2 includes: one or more bearing faces 2 2 1 , a valley hole 2 2 2 and a groove 2 2 3 , The bearing surface 2 2 1 is disposed on the two sides of the receiving hole 2 22 and the groove 2 2 3 and is connected thereto, and the bearing surface 2 2 1 is provided with more than one fixing hole 2 1 , 5 容容孔2 2 2 is radially extended from the nut 2 to the perforation 2 1 and is tangentially connected to the load path 6 ( (as shown in the sixth and seventh figures 7 201024573 shows the accommodating hole 2 2 2 series completely with the load path 6 0 phase The advantage that the accommodating hole 2 2 2 is tangentially connected to the load path 60 is that the accommodating hole 2 2 2 can be prevented from interfering with the adjacent rolling groove 2 1 1; For the part where the accommodating hole 2 2 2 is completely tangent to the negative load path 60, it is processed well by a processing machine of three or more axes, but is processed by a conventional three-axis processing machine. It is not easy to process; therefore, the present invention provides a well-processed accommodating hole 2 2 2 structure (hereinafter referred to as the tenth figure) for the conventional three-axis processing machine system, and the accommodating hole 2 2 2 One side of the groove 2 2 3 is a first surface 2221 , and a surface opposite to the first surface 2221 is a second surface 2222 , and the first surface 2 2 2 1 is not connected to the load path 6 . The tantalum is tangent, and the second surface 2 22 is tangent to the load path 60, so that it is machined by a conventional three-axis machining machine, and the path of the cutter 70 is as long as it is drooping. Vertically perpendicular to the axis of the nut) The lower knife will form part of the receiving hole 2 2 2 and then 'slanting the knife in the oblique direction, and the angle of the lifting knife is equal to the rolling of the screw The angle of the lead angle of the moving groove 2 1 1 can be quickly processed to improve the versatility of the machine processing and accelerate the production speed; the groove 223 is an arc structure, one end of which is accommodated The hole 2 2 2 is engaged, the other end is engaged with the return hole 23, and the groove 2 2 3 is disposed in parallel with the axis of the nut 2; a reflow assembly 3 ′ is received in the receiving structure 2 2 The 201024573 includes: a second reflow element 3 1 , a positioning member 3 2 and a fixing member 3 3 ; wherein the reflow element 31 is composed of the first element 3 1A and the second element 3 1B 'the first element 3 1A The second element 3 1B is provided with opposite joint faces 3 1 2A, 3 1 2B and a half return flow path.
311A、311B，該接合面312A、312B 係設有定位構件3 1 2 1 A、3 1 2 1 B，該定位構 件3121A、3121B係能相互卡合，使該第一 ❿ 元件3 1 A及第二元件3 1 B組合成該迴流元件3 1 ’而兩該半迴流道3 1 1 A、3 1 1 B係構成一迴 流道3 1 1，而該迴流元件3 1係區分為銜接部3工 2及彎曲部3 1 3，該銜接部3 1 2係插設於該容置 孔2 2 2中，使該迴流道3 1 1之一端與該負荷路徑 6 0相連接，該彎曲部3 3係容置於該凹槽2 2 3 中，且该彎曲部3 1 3之彎曲面3 1 3 3係與該凹槽 Q 2 2 3貼合，使該迴流道3丄之另一端與該迴流孔 2 3連接而構成一完整的循環路徑；該定位件3 2係 - 提供該迴流元件3 1定位用，其係蓋設於該迴流元件 * 3 1之上方，該定位件3 2係設有一定位凹部3 2 1 及位於敎位凹部3 2 1兩側之翼部3 2 2，該定位 凹邻3 2 1與該彎曲部3 1 3所設之上表面3 1 3 2 對〇，該翼部3 22係承靠於該承靠面22 1，其上 設有與該固定孔2 2 1 1相對之通孔3 2 2丄；該固 201024573 定件3 3係穿設該通孔3 2 2 1後與該固定孔2 2 1 1配合定位，將該定位件3 2固定於該承靠面2 2 1 上’並使該定位件3 2壓制固定該迴流元件3 1 ; . 複數滾動件4，係裝設於該循環路徑中，其作為 該桿軸1與螺帽2之間的傳動介質；另外請參閱第六 圖所示，該滾動件4之間亦可裝設間隔子5，使該滾 ❹ 動件4之間不會產生碰撞，而該間隔子5係為塑膠材 質製成。 另外^該滾動件4由負荷路控6 0進入該迴流 道31 1時其速度相當快，且接著滾動件4進入最容 易產生撞擊的彎曲路徑（請參閱第六圖之箭頭τ為滾 動件衝擊方向，滾動件4係撞擊迴流道3 1丄之彎曲 © 路控之壁面）’而本發明於該彎曲路徑處設有補強部3 1 3 1 ’該補強部3 i 3 !之壁面厚度係大於其它壁 • Μ厚度’故可大幅提升迴流元件之彎㈣ . 擊強度。 <再者，請再參閱第七、八圖，本發明之螺帽2因 »又有該軸向之迴流孔2 3 ’所以該迴流孔 螺帽2之滾動摊9 η ! 0 士 興 動槽211具有一安全壁該 201024573 滾動槽2 1 1之剛性；而對於相同規格之滚珠螺桿因 不滾動件4之尺寸、或是否有加入間隔子5，都會使 該迴流元件3 1之迴流道3 1 1的曲率半徑R加大或 - 縮小；而針對須加大迴流道311之曲率半徑R的迴 流元件3 1來說，會使得該彎曲部3 1 3之外型尺寸 增加’相對該凹槽2 2 3之曲率半徑r也會增加，故 本發明可藉由該安全壁厚Η來調整該凹槽2 2 3之曲 0 率半徑r，使該迴流元件3 1可容置於該容置孔2 2 2及凹槽2 2 3中’總言之，因為有安全壁厚η的設 計’使該凹槽2 2 3不與該滾動槽2 1 1產生干涉， 故不會降低螺帽2整體的剛性，且此技術最適合應用 於大尺寸之滾動件4、小導程之負荷路徑6 0及裝設 有間隔子5之滚珠螺桿，這也是習知技術無法突破的 問題點。 最後’誠如第九A、Β圖所示，為本發明迴流元 件另一實施例’本發明之迴流元件3 1與定位件3 2 亦可一體成型，主要於該迴流元件3 1兩側各設有翼 部3 1 4，該翼部3 1 4係承靠於該承靠面2 2 1， 其上設有與該固定孔2 2 1 1相對之通孔3 1 4 1 ; 該迴流元件3 1之固定方式亦是藉由該固定件3 3係 穿設該通孔3221後與該固定孔221 1配合定 201024573 位，將該迴流元件3 1固定於該承靠面2 2 1上。 承上述，該迴流元件之翼部亦可不設，而將該通 孔直接成形於該迴流元件多於的壁厚中，亦可達相同 效果。 綜所上述，本發明係改善習知技術之問題點，使 滾珠螺桿之壽命及精度提升，並提升相同規格之滚珠 螺桿的通用性，所以本發明之『具有產業之可利用性』 應已毋庸置疑，除此之外，在本案實施例所揭露出的 特徵技術，於申請之前並未曾見於諸刊物，亦未曾被 公開使用，不但具有如上所述功效增進之事實，更具 有不可輕忽的附加功效，是故，本發明的『新穎性』 以及『進步性』都已符合專利法規，爰依法提出發明 _ 專利之申請，祈請惠予審查並早日賜准專利，實感德 ❿ 便。 以上所述實施例之揭示係用以說明本發明，並非 用以限制本發明，故舉凡數值之變化與等效元件之置 換，仍應隸屬本發明之範疇。 12 201024573 【圖式簡單說明】 第一圖為本發明之外置式迴流元件之滚珠螺桿立 體圖。 第二圖為本發明之迴流元件與螺帽之爆炸及組合 . 圖。 第三圖為本發明之螺帽結構立體圖。 第四圖為本發明之迴流元件立體圖。 第五A圖為本發明之迴流元件之第一元件立體 圖。 第五B圖為本發明之迴流元件之第二元件立體 圖。 第六圖為本發明之螺帽、定位件、迴流元件、滾 動件及間隔子之間配合示意圖。 第七圖為本發明之螺帽、定位件、迴流元件及滾 p 動件之間配合示意圖。 第八圖為本發明之螺帽之容置結構、定位件及迴 流元件配合之端視圖。 第九A圖為本發明迴流元件另一實施例之組合 圖。 第九B圖為本發明迴流元件另一實施例之爆炸 圖。 第十圖為本發明容置孔加工方式之示意圖。 13 201024573 【主要元件符號說明】 1 桿軸 2 螺帽 一 211 滾動槽 ， 221 承靠面 222 容置孔 2222 第二表面 2 3 迴流孔 31 迴流元件 312 銜接部 313 彎曲部 3132 上表面 3 14 翼部 3 1 A 第一元件 ^ 3 1 2 A 接合面 〇 3 1 B 第二元件 . 3 1 2 B 接合面 3 2 定位件 3 2 2 翼部 3 3 固定件 5 間隔子 7 0 刀具 11 滾動溝 2 1 穿孔 2 2 容置結構 2211 固定孔 2221 第一表面 2 2 3 凹槽 3 迴流組件 311 迴流道 3121 導引片 3131 補強部 3133 彎曲面 3141 通孔 311A 半迴流道 3121A 定位構件 311B 半迴流道 3121B 定位構件 321 定位凹部 3221 通孔 4 滚動件 60 負荷路徑 7 0 1 刀具路徑 14 201024573 T 滾動件衝擊方向R、r 曲率半徑 Η 安全壁厚311A, 311B, the joint surfaces 312A, 312B are provided with positioning members 3 1 2 1 A, 3 1 2 1 B, and the positioning members 3121A, 3121B can be engaged with each other, so that the first 元件 element 3 1 A and the The two elements 3 1 B are combined into the reflow element 3 1 ' and the two semi-return channels 3 1 1 A, 3 1 1 B form a return channel 3 1 1 , and the reflow element 3 1 is divided into the junction part 3 2 and the curved portion 3 1 3, the engaging portion 3 1 2 is inserted into the receiving hole 2 2 2 such that one end of the return channel 31 is connected to the load path 60, and the curved portion 3 3 The structure is placed in the groove 2 2 3 , and the curved surface 3 1 3 3 of the curved portion 3 1 3 is attached to the groove Q 2 2 3 so that the other end of the return channel 3丄 and the reflow The holes 23 are connected to form a complete circulation path; the positioning member 32 is configured to provide the reflow element 31 for positioning, and the cover member is disposed above the reflow element * 3 1 , and the positioning member 32 is provided with a a positioning recess 3 2 1 and a wing portion 32 2 on both sides of the clamping recess 3 2 1 , the positioning recess 3 2 1 facing the upper surface 3 1 3 2 of the curved portion 3 1 3 , the wing The portion 3 22 is supported by the bearing surface 22 1 a through hole 3 2 2 相对 is formed opposite to the fixing hole 2 2 1 1; the fixing 201024573 is fixed through the through hole 3 2 2 1 and is coordinated with the fixing hole 2 2 1 1 , The positioning member 3 2 is fixed on the bearing surface 2 2 1 and presses the positioning member 32 to fix the reflow element 3 1 ; the plurality of rolling elements 4 are installed in the circulation path as the shaft 1 and the transmission medium between the nut 2; please also refer to the sixth figure, the spacers 5 can also be provided with spacers 5, so that there is no collision between the rolling elements 4, and the The spacer 5 is made of plastic material. In addition, the rolling member 4 is relatively fast when the load path 60 enters the return passage 31 1 , and then the rolling member 4 enters the curved path which is most likely to cause an impact (refer to the arrow τ in the sixth figure for the rolling member impact) In the direction, the rolling member 4 is struck against the return channel 3 1 弯曲 bending © the wall surface of the road control.) The present invention is provided with a reinforcing portion 3 1 3 1 ' at the curved path. The wall thickness of the reinforcing portion 3 i 3 ! is greater than Other walls • Μ thickness can greatly increase the bending of the reflow element (4). <Moreover, please refer to the seventh and eighth figures. The nut 2 of the present invention has the axial return hole 2 3 ', so the rolling hole of the return hole nut 2 is η ! 0 士The groove 211 has a safety wall which is rigid to the 201024573 rolling groove 21 1; and for the ball screw of the same specification, because of the size of the non-rolling member 4, or whether or not the spacer 5 is added, the return path 3 of the reflow element 3 1 is caused. The radius of curvature R of 1 1 is increased or decreased; and for the reflow element 3 1 which has to increase the radius of curvature R of the return passage 311, the outer dimension of the curved portion 3 1 3 is increased 'relative to the groove 2 The radius of curvature r of the 2 3 is also increased. Therefore, the radius r of the groove 2 2 3 of the groove 2 2 3 can be adjusted by the safety wall thickness , so that the reflow element 31 can be accommodated in the accommodating hole. 2 2 2 and the groove 2 2 3 'in general, because of the design of the safe wall thickness η', the groove 2 2 3 does not interfere with the rolling groove 2 1 1 , so the nut 2 is not lowered as a whole. Rigidity, and this technique is most suitable for a large-sized rolling element 4, a small lead load path 60, and a ball screw equipped with a spacer 5. This is also a problem that conventional technology cannot break through. Finally, as shown in the ninth A and the drawings, another embodiment of the reflow element of the present invention, the reflow element 31 of the present invention and the positioning member 32 can also be integrally formed, mainly on both sides of the reflow element 31. a wing portion 3 1 4 is disposed, the wing portion 3 14 is supported by the bearing surface 2 2 1 , and a through hole 3 1 4 1 opposite to the fixing hole 2 2 1 1 is disposed thereon; the reflow element In the fixing manner of the fixing member 3 3 , the through hole 3221 is inserted through the fixing hole 3 3 and the fixing hole 221 1 is matched with the fixing hole 221 1 to fix the position of the reflow element 31 to the bearing surface 2 21 . In the above, the wing portion of the reflow element may not be provided, and the through hole may be directly formed in the wall thickness of the reflow element, and the same effect may be obtained. In view of the above, the present invention is to improve the problems of the prior art, improve the life and accuracy of the ball screw, and improve the versatility of the ball screw of the same specification. Therefore, the "industrial availability" of the present invention should be eliminated. In addition, in addition, the feature technology exposed in the embodiment of the present case has not been seen in the publications before the application, nor has it been used publicly, not only has the fact that the above-mentioned effects are enhanced, but also has an additional effect that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention have been in compliance with the patent regulations, and the application for inventions _ patents has been filed according to law, and it is prayed for review and early granting of patents. The above description of the embodiments is intended to be illustrative of the invention, and is not intended to limit the scope of the invention. 12 201024573 [Simple description of the drawings] The first figure is a perspective view of a ball screw of an external reflow element of the present invention. The second figure is an explosion and combination of the reflow element and the nut of the present invention. The third figure is a perspective view of the nut structure of the present invention. The fourth figure is a perspective view of the reflow element of the present invention. Figure 5A is a perspective view of the first element of the reflow element of the present invention. Figure 5B is a perspective view of a second component of the reflow element of the present invention. Figure 6 is a schematic view showing the cooperation between the nut, the positioning member, the reflow member, the rolling member and the spacer of the present invention. The seventh figure is a schematic view of the cooperation between the nut, the positioning member, the reflow element and the rolling member of the present invention. The eighth figure is an end view of the accommodating structure, the positioning member and the returning member of the nut of the present invention. Figure 9A is a combination view of another embodiment of the reflow element of the present invention. Figure IXB is an exploded view of another embodiment of the reflow element of the present invention. The tenth figure is a schematic view of the processing method of the accommodating hole of the present invention. 13 201024573 [Description of main components] 1 shaft 2 nut 211 rolling groove, 221 bearing surface 222 receiving hole 2222 second surface 2 3 return hole 31 return element 312 engaging portion 313 bending portion 3132 upper surface 3 14 wing Part 3 1 A First element ^ 3 1 2 A Joint surface 〇 3 1 B Second element. 3 1 2 B Joint surface 3 2 Positioning piece 3 2 2 Wing part 3 3 Fixing piece 5 Spacer 7 0 Tool 11 Rolling groove 2 1 perforation 2 2 accommodating structure 2211 fixing hole 2221 first surface 2 2 3 groove 3 reflow assembly 311 return path 3121 guide piece 3131 reinforcement part 3133 curved surface 3141 through hole 311A semi-return path 3121A positioning member 311B semi-return path 3121B Positioning member 321 Positioning recess 3221 Through hole 4 Rolling member 60 Load path 7 0 1 Tool path 14 201024573 T Rolling direction of impact part R, r Curvature radius Η Safety wall thickness
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