1378194 六、發明說明： 【發明所屬之技術領域】 本發明係為一種傳動元件，尤指一種具鏈條式滾 珠螺桿。 【先前技術】 請參閱圖一A、B、C所示，係為習知鏈條於螺 才干及螺帽之間運行進入迴流元件之迴流道狀態圖該 螺桿1係設有一螺旋狀之滾動溝11，該螺帽2係套 設於該螺桿1 ’並設有相對該滾動溝1 1之滾動槽2 1 ’該滚動溝1 1及滚動槽2 1係構成一負荷路徑， 及該螺帽2外表面設有複數個安裝槽2 2，該安裝槽 2 2係與該滾動槽2 1銜接，該迴流元件3係設有兩 腳部3 3及連接該腳部3 3之本體，兩該腳部3 3係 分別插設於該安裝槽2 2中，且該迴流元件3設有貫 穿兩該腳部3 3之迴流道3 1，該迴流道3 1係與該 負荷路徑連接，且該迴流道3 1係設有與該螺帽2之 内緣表面2 4及該螺桿1之外緣表面1 2銜接之導引 部3 2，該負荷路徑係設有一滚動模組4，該滾動模 組4係由一鏈條4 2及複數個滾動件4 1組成，該鏈 條4 2由複數個間隔排列之間隔部4 2 1及連接該間 隔部4 2 1之連接部4 2 2所組成，該滚動件4 1係 設置於該間隔部4 2 1之間，另該連接部4 2 2於該 3 1378194 負荷路徑係容設於該螺帽2之内緣表面2 4及該螺桿 1之外緣表面1 2之間，而於迴流道3 1時係容設於 該導引部3 2，該鏈條4 2使該滚動件4 1於運行時 不會產生相互碰撞。然而，該安裝槽2 2之槽底與該 螺帽2之内緣表面2 4相交處具有一凸出部2 3，該 凸出部2 3會使原先應進入導引部3 2之連接部4 2 2改變運行方向而與該迴流元件3產生干涉X，進而 使該滾動模組4無法進入該迴流道3 1進行循環，故 相對也造成滚珠螺桿無法運行，嚴重者造成滚珠螺桿 損壞，故此問題仍有改良之必要。 【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，提升鏈條於螺桿及螺 帽之間的運行順暢度，避免鏈條與迴流元件產生干涉。 為達上述之目的，本發明係為一種具鏈條式滾珠 螺桿，係包含： 一螺桿，其於外緣表面具有螺旋狀之滾動溝； m 一螺帽，係設有一供該螺桿穿設之穿孔，該穿孔 之内緣表面係設有相對該滚動溝之滾動槽，該滾動溝 及滚動槽係構成一負荷路徑，另於該螺帽外表面設有 複數與該滚動槽銜接之安裝槽，該安裝槽係具有一槽 4 1378194 底面，且該穿孔之内緣表面與該槽底面相交處係具有 一減料部； 迴流元件，係具有一本體，該本體兩端係各延伸 一腳部，且該迴流元件係具有一迴流道，該迴流道係 貫穿該本體及腳部，該迴流道係與該負荷路徑連接構 成一完整的循環路徑，另該迴流道係具有兩導引部， 該導引部係與該螺桿之外緣表面及該螺帽之内緣表面 銜接； 滚動模組，係包含一鏈條及複數滚動件，該鏈條 由複數個間隔排列之間隔部及連接該間隔部之連接部 所組成，該滾動件係設置於該間隔部之間，另該連接 部於該負荷路徑係容設於該螺帽之内緣表面及該螺桿 之外緣表面之間，而於迴流道時係容設於該導引部。 其中，該腳部係設有朝該滾動溝凸伸之導引部， 該導引部係位於該迴流道之兩端並嵌設於該滚動溝。 其中，該腳部之底部設有一承靠面，該承靠面係 承靠於該槽底面。 其中，該腳部之迴流道兩侧且靠近該腳部之承靠 面具有第二減料部，且該第二減料部與該螺帽之減料 部相銜接。 其中，該減料部於軸方向的寬度略大於該連接部 之寬度。 m 5 其中，該減料部係為曲面。 其中，該減料部係為平面。 其中，該第二減料部係為曲面。 其中，該第二減料部係為平面。 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β 【實施方式】 請參閲圖二至四及圖五入、B、c所示，本發明 係為一種具鏈條式滾珠螺桿，係包含： 一螺桿5，其於外緣表面5 2具有螺旋狀之滾動 溝5 1 ; 一螺帽Θ，係設有一供該螺桿5穿設之穿孔6 1 ’該穿孔6 1之内緣表面6 3係設有相對該滾動溝 5 1之滾動槽6 1 1，該滾動溝5 ;[及滾動槽6 1 1 係構成一負荷路徑，另於該螺帽6外表面設有複數與 該滾動槽6 1 1銜接之安裝槽6 2，該安裝槽6 2係 具有一槽底面6 2 1，且該穿孔6 1之内緣表面6 3 與該槽底面6 2 1相交處係具有一減料部6 4，該減 料部6 4於軸方向的寬度Η (請參閱圖四）略大於後 述之連接部8 1 1之寬度； 1378.194. v 遐训件7，係具有一本體7 〇，該本體7 〇兩 端係各延伸—腳部7 1，該腳部7 1之底部設有-承 靠面7 3 ’該承靠面7 3係承靠於該槽底面6 2工， 且該腳4 7 1之迴流道7 2兩側且靠近該承靠面6 2 1具有第二減料部7 4，且該第二減料部7 4與該螺 帽6之減料部6 4相衡接，該迴流元件7係具有一迴 流道7 2，該迴流道7 2係貫穿該本體7 〇及腳部7 籲 1’該迴流道72係與該負荷路徑連接構成一完整的 循環路徑，另該迴流道7 2係具有兩導引部7 2工， 該導引部7 2 1係與該螺桿5之外緣表面5 2及該螺 帽6之内緣表面6 3銜接，另該腳部7 i係設有朝該 滚動溝5 1凸伸之導引部7 i i，該導引部7 i工係 位於該迴流道7 2之兩端並嵌設於該滾動溝5工； 滾動模組8，係包含一鏈條§ 1及複數滾動件8 _ 2，該鏈條8 1由複數個間隔排列之間隔部8 1 2及 連接該間隔部8 1 2之連接部8 1 1所組成，該滾動 件8 2係設置於該間隔部8 1 2之間，另該連接部8 1 1於該負荷路徑係容設於該螺帽6之内緣表面6 3 及該螺桿5之外緣表面5 2之間，而該連接部§ 1 1 於迴流道7 2時係容設於該導引部7 2 1。 【s] 再者’再請參閱圖五A、B、c，係為本發明之 鏈條81於螺桿5及螺帽6之間運行及進入迴流元件 7 1378194 7之迴流道7 2狀態圖，因為該螺帽6之穿孔6 1之 内緣表面6 3與該槽底面6 2 1相交處係具有一減料 部6 4，使該鏈條8 1之連接部8 1 1進入迴流道7 2時無阻凝，相對也使滚珠螺桿運行更為順暢。 綜所上述，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 專利之申諳，祈請惠予審查並早日賜准專利，實感德 便。 以上所述實施例之揭示係用以說明本發明，並非 用以限制木發明，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。 m 8 1378194. 【圖式簡單說明】 圖一 A係為習知技術鏈條於螺桿及螺帽之間運行 進入迴流元件之迴流道狀態圖一。 圖一 B係為習知技術鏈條於螺桿及螺帽之間運行 進入迴流元件之迴流道狀態圖二。 圖一 C係為習知技術鏈條於螺桿及螺帽之間運行 進入迴流元件之迴流道狀態圖三。 圖二係為本發明具鏈條式滾珠螺桿之分解圖（不 包含鏈條及滚動件）。 圖三係為本發明具鏈條式滾珠螺桿之組合圖。 圖四係為本發明螺帽半剖視圖，並顯示出靠近迴 流道兩端的螺帽結構。 圖五A係為本發明具鏈條式滾珠螺桿，該鏈條於 螺桿及螺帽之間運行進入迴流元件之迴流道狀態圖 一— 〇 圖五B係為本發明具鏈條式滾珠螺桿，該鏈條於 螺桿及螺帽之間運行進入迴流元件之迴流道狀態圖 —— 〇 圖五C係為本發明具鏈條式滚珠螺桿，該鏈條於 螺桿及螺帽之間運行進入迴流元件之迴流道狀態圖 m 9 1378194. 【主要元件符號說明】 習知技術 1 螺桿 1 1 滚動溝 1 2 外緣表面 2 螺帽 2 1 滚動槽 2 2 安裝槽 2 3 凸出部 2 4 内緣表面 3 迴流元件 3 1 迴流道 3 2 導引部 3 3 腳部 4 滾動模組 4 1 滾動件 4 2 鏈條 4 2 1 間隔部 4 2 2 連接部 X 干涉處 本發明 5 螺桿 5 1 滚動溝 5 2 外緣表面 6 螺帽 6 1 穿孔 6 1 1 滚動槽 6 2 安裝槽 6 2 1 槽底面 6 3 内緣表面 6 4 減料部 Η 寬度 7 迴流元件 7 0 本體 7 1 腳部 7 1 1 導引部 7 2 迴流道 7 2 1 導引部 7 3 承靠面 7 4 第二減料部 1378.194. 8 滾動模組 81 鏈條 811 連接部 812 間隔部 8 2 滾動件1378194 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention is a transmission component, and more particularly a chain ball screw. [Prior Art] Please refer to FIG. 1A, B, and C, which is a return flow state diagram of a conventional chain running between a screw nut and a nut into a reflow element. The screw 1 is provided with a spiral rolling groove 11 The nut 2 is sleeved on the screw 1 ′ and is provided with a rolling groove 2 1 ′ relative to the rolling groove 1 1 . The rolling groove 1 1 and the rolling groove 21 form a load path, and the nut 2, the outer surface is provided with a plurality of mounting slots 2 2 , the mounting slots 2 2 are engaged with the rolling slot 2 1 , the reflow element 3 is provided with two leg portions 3 3 and a body connecting the leg portions 3 3 , The leg portion 3 3 is respectively inserted into the mounting groove 22, and the reflow element 3 is provided with a return channel 3 1 penetrating through the leg portions 33, and the return channel 31 is connected to the load path, and the The return passage 31 is provided with a guiding portion 3 2 that is engaged with the inner edge surface 24 of the nut 2 and the outer edge surface 12 of the screw 1, and the load path is provided with a rolling module 4, the rolling The module 4 is composed of a chain 4 2 and a plurality of rolling elements 4 1 , and the chain 4 2 is composed of a plurality of spaced-apart spacers 4 2 1 and a connecting portion 4 2 2 connecting the spacers 4 2 1 The rolling piece 4 1 is disposed between the spacing portion 42 1 , and the connecting portion 42 2 is received on the inner edge surface 24 of the nut 2 and the screw in the load path of the 3 1378194 1 is between the outer edge surfaces 1 2, and is accommodated in the guiding portion 3 2 at the return channel 31, and the chain 4 2 causes the rolling members 41 to not collide with each other during operation. However, the bottom of the groove of the mounting groove 22 and the inner edge surface 24 of the nut 2 have a projection 23 which will initially enter the joint of the guiding portion 3 2 . 4 2 2 change the running direction and generate interference X with the reflow element 3, so that the rolling module 4 cannot enter the return channel 31 to circulate, so the ball screw can not be operated relatively, and the ball screw is damaged seriously. The problem is still necessary for improvement. SUMMARY OF THE INVENTION Based on the problems of the above-described conventional techniques, the inventors of the present invention have succeeded in research and improvement, and the invention of the following inventions can be finally achieved. That is, the primary object of the present invention is to improve the smooth running of the chain between the screw and the nut to avoid interference between the chain and the reflow element. In order to achieve the above object, the present invention is a chain ball screw comprising: a screw having a spiral rolling groove on an outer surface; m a nut having a perforation for the screw to be inserted The inner surface of the perforation is provided with a rolling groove opposite to the rolling groove, the rolling groove and the rolling groove form a load path, and the outer surface of the nut is provided with a plurality of installations connected with the rolling groove a groove having a bottom surface of a groove 4 1378194, and a surface of the inner edge of the perforation intersecting the bottom surface of the groove has a reducing portion; the reflow element has a body, and the two ends of the body are extended And the reflow element has a return passage extending through the body and the leg, the return passage being connected to the load path to form a complete circulation path, and the return passage having two guiding portions The guiding portion is engaged with the outer edge surface of the screw and the inner edge surface of the nut; the rolling module comprises a chain and a plurality of rolling elements, and the chain is connected by a plurality of spaced intervals and connecting the Interconnect a connecting portion, the rolling member is disposed between the spacing portions, and the connecting portion is disposed between the inner surface of the nut and the outer surface of the screw in the load path, and is in the return path The time is provided in the guiding portion. Wherein, the leg portion is provided with a guiding portion protruding toward the rolling groove, and the guiding portion is located at two ends of the returning channel and is embedded in the rolling groove. Wherein, the bottom of the leg portion is provided with a bearing surface, and the bearing surface bears against the bottom surface of the groove. Wherein, the bearing surfaces on both sides of the return path of the leg and close to the leg have a second reducing portion, and the second reducing portion is engaged with the reducing portion of the nut. The width of the reducing portion in the axial direction is slightly larger than the width of the connecting portion. m 5 wherein the reduced portion is a curved surface. Wherein, the reducing portion is a flat surface. The second reducing portion is a curved surface. Wherein, the second reducing portion is a flat surface. For a better understanding of the features and technical aspects of the present invention, reference should be made to the description of the embodiments of the invention. [beta] [Embodiment] Referring to Figures 2 to 4 and Figures 5, B, and c, the present invention is a chain ball screw comprising: a screw 5 having a peripheral surface 52 a spiral rolling groove 5 1 ; a nut Θ is provided with a through hole 6 1 for the screw 5 to pass through. The inner edge surface 63 of the through hole 6 1 is provided with a rolling groove 6 opposite to the rolling groove 5 1 . 1 , the rolling groove 5; [and the rolling groove 6 1 1 constitute a load path, and the outer surface of the nut 6 is provided with a plurality of mounting grooves 6 2 engaging with the rolling groove 61 1 , the mounting groove 6 The 2 series has a groove bottom surface 6 2 1 , and the inner edge surface 6 3 of the perforation 6 1 intersects the groove bottom surface 6 2 1 to have a reducing portion 64, and the width of the reducing portion 64 in the axial direction Η (please refer to Figure 4) is slightly larger than the width of the connecting portion 8 1 1 described later; 1378.194. v 遐 件 7 has a body 7 〇 The bottom of the body 7 各 is extended to the foot 7 1 , and the bottom of the leg 7 1 is provided with a bearing surface 7 3 ′. The bearing surface 7 3 is supported by the bottom surface of the groove 6 2 , and A second reducing portion 74 is disposed on both sides of the return passage 7 2 of the leg 471 and adjacent to the bearing surface 61, and the second reducing portion 74 and the reducing portion 6 4 of the nut 6 The return element 7 has a return path 7 2 which extends through the body 7 and the foot 7 and the return path 72 is connected to the load path to form a complete circulation path. The return channel 72 has two guiding portions 7 2 , and the guiding portion 7 2 1 is engaged with the outer edge surface 52 of the screw 5 and the inner edge surface 63 of the nut 6. The leg portion 7 i is provided with a guiding portion 7 ii protruding toward the rolling groove 5 1 , and the guiding portion 7 i is located at both ends of the returning channel 7 2 and embedded in the rolling groove 5; The module 8 includes a chain § 1 and a plurality of rolling elements 8 _ 2, and the chain 8 1 is composed of a plurality of spaced-apart spacers 8 1 2 and a connecting portion 8 1 1 connecting the spacers 8 1 2 , The rolling member 8 2 is disposed between the spacers 8 1 2 The connecting portion 8 1 1 is disposed between the inner edge surface 63 of the nut 6 and the outer edge surface 52 of the screw 5, and the connecting portion § 1 1 is at the return path 7 2 It is accommodated in the guiding portion 7 21 . [s] Further, please refer to FIG. 5A, B, and c, which is a state diagram of the return path 7 2 of the chain 81 of the present invention running between the screw 5 and the nut 6 and entering the reflow element 7 1378194 7 because The inner edge surface 63 of the through hole 61 of the nut 6 has a reducing portion 64 at the intersection of the bottom surface 6 2 1 of the groove, so that the connecting portion 8 1 1 of the chain 8 1 enters the return channel 7 2 without hindrance. Condensation, which also makes the ball screw run more smoothly. In view of the above, the "industry availability" of the present invention should be unquestionable. In addition, the feature technology disclosed in the embodiment of the present invention has not been seen in publications before the application, nor has it been disclosed. The use, not only has the fact that the effect is improved as described above, but also has an additional effect that cannot be neglected. Therefore, the "novelty" and "progressiveness" of the present invention have met the patent regulations, and the application for the invention patent is filed according to law. Pray for the review and early grant of patents. The above description of the embodiments is intended to be illustrative of the invention, and is not intended to limit the invention, and variations of the values and equivalent elements are still within the scope of the invention. m 8 1378194. [Simple description of the drawing] Figure 1 is a state diagram of the return flow of the conventional technology chain running between the screw and the nut into the return element. Figure 1 B is a state diagram of the return flow of the conventional technology chain running between the screw and the nut into the return element. Figure 1 C is the state of the return flow of the conventional technology chain running between the screw and the nut into the return element. Figure 2 is an exploded view of the chain ball screw of the present invention (excluding chains and rolling members). Figure 3 is a combination diagram of a chain ball screw of the present invention. Figure 4 is a half cross-sectional view of the nut of the present invention and shows the nut structure adjacent the ends of the return flow. Figure 5A is a chain ball screw of the present invention, the chain running between the screw and the nut into the return flow state of the reflow element. Figure 1 - Figure 5B is a chain ball screw of the present invention, the chain is The state of the return flow path between the screw and the nut running into the reflow element - Figure 5C is the return type ball screw of the present invention with the chain ball screw running between the screw and the nut into the reflow element 9 1378194. [Explanation of main component symbols] Conventional technology 1 Screw 1 1 Rolling groove 1 2 Outer edge surface 2 Nut 2 1 Rolling groove 2 2 Mounting groove 2 3 Projection 2 4 Inner edge surface 3 Reflow element 3 1 Return path 3 2 Guide part 3 3 Foot part 4 Rolling module 4 1 Rolling element 4 2 Chain 4 2 1 Spacer 4 2 2 Connection part X Interference area 5 Screw 5 1 Rolling groove 5 2 Outer edge surface 6 Nut 6 1 Perforation 6 1 1 Rolling groove 6 2 Mounting groove 6 2 1 Groove bottom surface 6 3 Inner edge surface 6 4 Reducing section 宽度 Width 7 Reflow element 7 0 Body 7 1 Foot 7 1 1 Guide 7 2 Return path 7 2 1 Guide 7 3 Bearing surface 7 4 Second reduction section 1378.194. 8 Rolling module 81 Chain 811 Connection part 812 Spacer 8 2 Rolling parts