1351477 九、發明說明： 【發明所屬之技術領域】 本發明係為滾珠螺桿之螺帽内之迴流裝置，該迴流裝 置使滾珠螺桿内之滾動件能轉向迴流而完成循環滚動，讓 螺桿及螺帽彼此相互運動以傳遞動力。 【先前技術】 滚珠螺桿之滾動件迴流方式，一般分為外循環方式、 内循壞方式及端塞方式等；其巾外循環式迴流係將滾動件 導出螺帽外部迴流以完成循環，而内循環式迴流係滾動件 直接於螺帽内部之内螺紋中迴流完成循環，端塞式迴流則 是將螺帽内螺紋中之滾動件從螺帽端面導引至螺帽之孔 道中迴流以完成循環。傳統之端塞式迴流如美國第 4357838號專利，其中端塞2 〇從螺帽丄〇之端面丄6裝 入螺帽1 0内徑中，將螺帽1 〇之螺紋槽i 2中的滾動件 7 0引導至迴流孔3 8以完成迴流循環。 而端塞2 0兩側分別為與螺帽1 〇配合之底面4 8 及與螺桿1 1配合之上曲面5 6，且端塞2 0中設有固定 孔5 2以固定端塞2 0於螺帽1 〇上；端塞2 〇中還設有 轉向路徑6 2及蓋板6 8，使滾動件γ 〇受轉向路徑6 2 及蓋板6 8導引而轉向以完成迴流循環。 5 1351477 ㈣統滾珠螺桿之端塞式迴流褒置因與螺桿及螺帽 •内徑配合，使其結構形狀複雜，故一般皆使用開模射出方 式製造端塞；其次’由於該端塞式迴流裝置需與螺帽師 • 配合，因此精度需求較高，而造成螺帽加工不易且加工道 •二欠較繁瑣所以成本也較高；再者，滾珠螺桿組裝時需先置 入迴流裝置再以螺絲固定於螺帽内徑中隨後置入滾動件 再旋入螺桿，使得螺桿需要出牙才能適用端塞方式迴流； • 且該端塞式迴流裝置係無法製作偏位導程之預壓方式。 另外，美國第6425302號專利案為一種外塞式迴流裝 置，由該案之圖1可了解，於螺帽設有，裝設該迴流裝置 3 2 (34)之容置孔28 (30)，而該容置孔28 (3 0)係與迴流道5 〇呈垂直之型態，當該螺帽之滾動溝2 6之導程較小時，該容置孔28(3〇)容易與鄰近的滾 • 動溝26干涉，使該滾動溝26產生破牙（不完整之牙 型）。 綜合上述，傳統滾珠螺桿之端塞迴流方式實有改良 精進之必要。 【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 6 1351477 後’終有確能達紅τ發明之目的之發明誕生。 即，本發明首要目的在於，係提供—種滾珠螺桿之迴 流裝置’其以直接置人螺帽本體的方式，使滾珠螺桿組裝 時螺桿無需出牙，且使螺帽本體加工複雜程度降低。’、 本發明次要目的在於，提供—種滾珠螺桿之迴流裝 置’可設計成偏位導程之預壓方式。 本發明最終目的在於，提供—種滾珠螺桿之迴流裝 置，可適用於各種導程之滾珠螺桿。 為達上述之目的，本發明係為一種滾珠螺桿，係包含： 一桿軸，其外緣設有一滾動溝； 一螺帽，其設有一供該桿軸套設之穿孔，該穿孔内緣 "又有相對該滾動溝之滾動槽，該滾動溝及滾動槽係配合形 成一負荷路徑，且該螺帽外緣設有兩連通該穿孔之容置 孔、及一連通該容置孔之軸向孔，該容置孔係為狹長型， 而該谷置孔之延伸方向與該負荷路徑之中心線的延伸方 向一致，該容置孔係設有承靠面； 兩迴流裝置’係各別裝設於該容置孔，該迴流裝置設 有一迴流道及抵靠面，該迴流道之兩端各別銜接該負荷路 徑及該軸向孔’而構成一完整之循環路徑（係包含負荷路 7 77 徑），且該迴流道之負荷銜接端係沿該負荷路徑之中心線 的切線方向延伸設置，該抵靠面係承靠於該承靠面，以防 止該迴流裝置向該螺帽之穿孔滑動； 若干滾動件，係容置於該循環路徑中作為該桿轴及螺 帽之介質，讓該桿軸及螺帽彼此相互運動以傳遞動力。 本發明之循環路徑係由部分負荷路徑、兩迴流裝置之 迴流道與一軸向孔所構成，而本發明之滾珠螺桿亦可構成 多循環路徑，而多循環路徑之特色在於：該螺帽外緣係設 有至少四個以上之容置孔及至少兩個以上連通該各容置 孔之軸向孔，該容置孔係為狹長型，而該容置孔之延伸方 向與該負荷路徑之中心線的延伸方向一致，其中有兩容置 孔之延伸方向位㈣-平面，且該兩容置孔之間係有一段 無效牙（註：無效牙是指無滾動件運行的負荷路徑，而保 留此無效牙主要是避免該兩容置孔距離太近時容易造成 立之難降低）’這樣—來充分利肋負荷路徑構成 多個猶環路徑’使可裝設滾動件之數量增加，以提升滾珠 螺桿之剛性；另外亦可藉由多個循環路徑來達到偏位導程 的功月b (其特殊的是只需一螺帽即可產生預麗力，而習知 技術都需要兩個螺帽才能產生髓力，如此可節省製造成1351477 IX. Description of the Invention: [Technical Field] The present invention is a reflow device in a nut of a ball screw, which allows the rolling elements in the ball screw to be turned back to complete the cycle rolling, allowing the screw and the screw The caps move relative to each other to transmit power. [Prior Art] The rolling method of the rolling element of the ball screw is generally divided into an external circulation mode, an internal circulation mode, and an end plug method; and the external circulation type of the roller is used to return the rolling member to the outside of the nut to complete the cycle, and the inside. The circulating reflow type rolling element completes the circulation directly in the internal thread of the nut, and the end plug type recirculation guides the rolling piece in the internal thread of the nut from the end face of the nut to the hole of the nut to complete the circulation. . Conventional end plug reflow, such as U.S. Patent No. 4,357,838, in which the end plug 2 is loaded into the inner diameter of the nut 10 from the end face 6 of the nut, and the rolling of the nut 1 in the thread groove i 2 The member 70 is directed to the return orifice 38 to complete the reflux cycle. The two sides of the end plug 20 are respectively a bottom surface 4 8 matched with the nut 1 及 and a curved surface 56 6 matched with the screw 1 1 , and a fixing hole 5 2 is provided in the end plug 20 to fix the end plug 20 The nut 1 is placed on the upper end; the end plug 2 is further provided with a steering path 6 2 and a cover plate 8 8 so that the rolling member γ 导引 is guided by the steering path 6 2 and the cover plate 8 8 to be turned to complete the recirculation cycle. 5 1351477 (4) The end plug type reflow device of the system ball screw is complicated with the shape of the screw and the nut and the inner diameter of the nut, so the end plug is generally manufactured by using the mold opening method; secondly, due to the end plug type reflow The device needs to be matched with the nut holder, so the precision requirement is high, and the nut processing is difficult, and the processing road and the second owing are cumbersome, so the cost is also high; in addition, the ball screw needs to be placed into the reflow device before assembly. The screw is fixed in the inner diameter of the nut and then inserted into the rolling element and then screwed into the screw, so that the screw needs to be toothed to be applied in the end plug mode; and the end plug type reflow device cannot make the preloading method of the offset lead. In addition, U.S. Patent No. 6,425,302 is an external plug type reflow device. As can be seen from Fig. 1 of the present invention, the nut is provided with a receiving hole 28 (30) of the reflow device 3 2 (34). The accommodating hole 28 (30) is perpendicular to the return channel 5 ,. When the lead of the rolling groove 26 of the nut is small, the accommodating hole 28 (3 〇) is easy to be adjacent thereto. The rolling groove 2 interferes to cause the rolling groove 26 to generate a broken tooth (incomplete tooth shape). In summary, the end plug reflow method of the conventional ball screw is necessary for improvement and refinement. SUMMARY OF THE INVENTION Based on the problems of the above-mentioned prior art, the inventors of the present invention have developed and improved the invention of the invention of the invention of the red τ. That is, the primary object of the present invention is to provide a reflow device for a ball screw which directly places the nut body so that the screw does not need to be toothed when the ball screw is assembled, and the processing complexity of the nut body is reduced. The secondary object of the present invention is to provide a reflow device for a ball screw that can be designed as a preloading method for a misalignment lead. The ultimate object of the present invention is to provide a ball screw reflow device that can be applied to ball screws of various lead types. In order to achieve the above object, the present invention is a ball screw comprising: a shaft having a rolling groove on an outer edge thereof; and a nut provided with a through hole for the shaft, the inner edge of the hole And a rolling groove corresponding to the rolling groove, the rolling groove and the rolling groove cooperate to form a load path, and the outer edge of the nut is provided with two receiving holes communicating with the through hole and a shaft connecting the receiving hole In the hole, the accommodating hole is elongated, and the extending direction of the valley hole is consistent with the extending direction of the center line of the load path, and the accommodating hole is provided with the bearing surface; The reflow device is provided with a return channel and an abutting surface, and the two ends of the return channel respectively connect the load path and the axial hole to form a complete circulation path (including a load path) 7 77), and the load connecting end of the return passage extends along a tangential direction of a center line of the load path, and the abutting surface bears against the bearing surface to prevent the return device from being applied to the nut Perforation sliding; several rolling parts, the system is placed in the cycle The ring path acts as a medium for the shaft and the nut, and the shaft and the nut move relative to each other to transmit power. The circulation path of the present invention is composed of a partial load path, a return path of two reflow devices, and an axial hole, and the ball screw of the present invention can also constitute a multi-cycle path, and the multi-cycle path is characterized in that: The edge is provided with at least four or more accommodating holes and at least two axial holes that communicate with the accommodating holes, the accommodating holes are elongated, and the extending direction of the accommodating holes and the load path The center line extends in the same direction, wherein there are two accommodating holes extending in the direction of (four)-plane, and there is a piece of invalid tooth between the two accommodating holes (Note: the invalid tooth refers to the load path without rolling parts running, and Retaining this invalid tooth is mainly to avoid the difficulty of reducing the distance between the two accommodating holes too close. "This way - to fully rib load path constitutes a plurality of circling paths", the number of installable rolling elements is increased to Improve the rigidity of the ball screw; in addition, the cycle of the offset lead can be achieved by a plurality of circulation paths (the special one is that only a nut can be used to generate the pre-reaction force, and the conventional technology requires two Nuts can be produced Force, thus reducing the fabrication into