M312611 八、新型說明： 【新型所屬之技術領域】 本案與線賊觸有關，更詳而言之，係指組配於線 ，致動々之轉桿上的主螺巾胃以及安全職，本案針對該 安全螺帽提出一改進方案。 【先前技術】 、如第-圖，線性致動器是一種利用馬達10及其齒輪、 鲁 _等驅動組件11，帶動—導螺桿12旋轉，利用結合於導 螺管12上的主螺㈣，驅動一内管14於一外管15中作線性 之伸縮運動。其系被應用於如病床上升、下降之承載機 構，或其它需採伸、縮運作之機械場合。 上述主螺巾目13之螺牙毁損為經常被提出討論的問題， 歸納其原因，包括了主螺帽13將導螺桿12之旋轉動力轉換 成-直線之推力，並帶動連接於主螺帽13上的内管14，該 春内吕14▼動工作物（圖未示）移動，因此主螺帽I3為承載負 荷之主要元件’螺牙與導螺㈣長時間㈣㈣磨耗毁 $。另外，為降低主螺帽13與導螺桿12之摩擦所產生的噪 曰，該主螺帽13或有㈣膠材f製成，惟，導螺桿12為金 屬桿材，對於塑膠主螺帽13之螺牙磨耗更顯嚴重。除此之 外’當内官14帶動工作物件出現不當阻力時，主螺帽财 可能出現立即性的崩裂損壞。 無論如何，主螺帽13一旦受損即無法負擔原先的承載 M312611 負荷，線性致動器迅即喪失致動能力，被帶動工作物將迅 即失重’導致更嚴重的其他問題。 為解决上述問4，業者提出-安全螺帽方案。如第一、 一圖’其係將—安全螺帽馳配於該導螺桿12上並位於該 主螺帽13的頭端131内部。當主螺帽13發生崩牙時，可藉由 j女王螺巾目20暫代承載負荷之功能，線性致_不致迅即 喪失致動能力，形成_保護個，提昇使用安全性。 • 上述方案的主要缺點，為該安全螺帽20只能承受與之 呈對抗方向的負荷。如第二圖中箭頭A，即表示致動器承 受一推力，該推力即為與安全螺帽2〇對抗的負荷。當主螺 帽13崩牙而無法負載箭頭a方向的力時，帶動的工作件迅 即失重。而該安全螺帽2〇可於此時發揮暫代承載負荷功 能’則可使主螺帽13、内管14以及工作物件安全復回原位。 但是，當致動器承受如第二圖中箭頭B方向的拉力 • 日守，"亥拉力與安全螺帽20的對抗方向相反，一旦主螺帽13 朋牙而热法負載該拉力時，會直接被該拉力拉出，而與安 全螺帽分離。安全螺帽20相對於主螺帽13而言無法發揮作 用。 簡吕之，上述安全螺帽13只能在致動器承受推力負荷 時提供安全保護，因此不適用於承受拉力的致動器。 除此之外，習知主螺帽13頭端131以圓形的承槽132供 圓形外輪廓的安全螺帽20容置，安全螺帽2〇與主螺帽13的 M312611 旋向限位靠著彼此的雜力’當導螺桿12轉的扭力大於 該磨擦力時’該安全螺_將被帶著旋轉，而無法被主螺 帽13定位’這將使得安全螺_無法發揮上述暫代主螺帽 13承載負荷之功能。 【新型内容】 本案提出一種線性致動器之螺帽組配結構，其安全螺 帽可在致動H承受拉力或推力的纽下，均能發揮暫代主 螺帽承載負荷之功能，而發揮安全保護作用。換言之，該 安全螺帽具有雙向承載負荷之能力。 本案線性致肺之螺帽組配結構，實施於—線性致動 器的導螺桿以及内管；包括： 一主螺帽，組配於該導螺桿上，其外部與上述内管之 管端組接； 一固定帽，組配於該内管之管端中； 一安全螺帽，組配於該導螺桿上，其兩端被上述的主 螺帽以及上述的固定帽所限制。 【實施方式】 如第三、四、五圖’圖中揭露本案螺帽組配結構實施 於習知線性致動器之情形。圖中的元件包括了内管3〇、導 螺桿40、主螺帽50、安全螺帽6〇以及固定帽7〇。該主螺帽 50組配於該導螺桿40上，其外部設外螺紋51與該内管洲管 M312611 端之内螺紋段31結合。 將該主螺帽50以其轴線的兩端分別定義為頭端犯及尾 端53 ’該尾端53設-組配空間54，供上述安全螺刪組配。 在本案實施例中，該組配空間54以及安全螺帽6〇之外輪廊 61是多角形，以角狀相配產生卡合固定作用。上述多㈣ 包含但不限於圖中所示的六角狀。 該固定帽70以其外螺紋71結合定位於該内管3〇之内螺 _紋舰’該導獅辨過其巾，但不接繼固定帽7〇。 〃上述主螺帽50以及與之組配的安全螺帽6〇結合於該内 官30之管端時’該安全螺帽6〇的兩端分別被上述的主螺帽 50以及固定帽7〇所限制。 如先前技術所述，在正常情況下，導螺桿4〇旋轉可使 該主螺㈣以及安全__步於其上作軸向之線性位 移’以帶動上述内管30 ’俾使該内管3〇產生推送或回縮之 藝動作’而達到線性之伸縮運動。但是，當該主螺帽5〇發生 崩牙a守，則必需藉由該安全螺帽6〇暫代承載負荷之功能。 值得說明的是，本案的安全螺帽6〇具有實現拉力及推 力之負荷能力。主要因為本案將該安全螺帽6〇設置在主螺 帽50的尾端’並且在内管3〇内設一固定帽7〇，該主螺帽训 以及固定帽70限制住該安全螺帽6〇的兩端，因此，在致動 器承受推力或拉力時，皆可發揮作用。 如第三圖，圖中以箭頭C表示致動器承受一推力。在 M312611 此情況下，當主螺帽50與該導螺桿40結合之螺牙崩毀，失 去結合於該導螺桿40之能力，以致無法負載該推力時，該 推力會藉由該固定帽70而施予該安全螺帽60，該安全螺帽 60迅即發揮暫代承載負荷功能。 同第三圖，圖中以箭頭D表示致動器承受一拉力。在 此情況下，當主螺帽50與該導螺桿40結合之螺牙崩毁，失 去結合於該導螺桿40之能力，以致無法負載該拉力時，該 • 安全螺帽60可以限制該主螺帽50，避免該主螺帽5〇被拉力 直接拉出’且該安全螺帽60被固定帽70及主螺帽5〇所限 制，因此該安全螺帽可發揮暫代承載負荷之功能。 练上所述，本案上述的螺帽組配方式，可在致動器承 受拉力或推力的情況下，均能發揮安全保護作用，因此本 案適用於承受推力及拉力的致動器。 又，本案安全螺帽60與主螺帽50係以多角形狀相配產 •生卡合固定_，該安全螺_可確實齡螺帽50定位， 而不會隨著導螺桿4〇旋轉，如此可使該安全螺帽⑼於該主 螺帽50崩牙時完全地發揮暫代承載負荷之功能。 雖然本案是以-個最佳實施例做說明，但精於此技藝 者能在不脫離本案精神與範脅下做各種不同形式的改變。 以上所舉實施例僅用以說明本案而已，非用以限制本案之 範圍。舉凡不違本案精神所從事的讎修改或變化，俱屬 本案申請專利範圍。 M312611 【圖式簡單說明】 第一圖為習知線性致動器之剖面圖。 第二圖為習知線性致動器配裝主螺帽及安全螺帽之示意 圖。 第三圖為本案主螺帽、安全螺帽以及固定帽組配於習知線 性致動器之局部剖視圖。 第四圖為本案主螺帽、安全螺帽以及固定帽與習知線性致 動器之局部螺桿的立體分解圖。 第五圖為依據第四圖之元件表示所繪另一態樣之立體分解 圖。 【主要元件符號說明】 10- 馬達 11- 驅動組件 12- 導螺桿 13- 主螺帽 131- 頭端 132- 承槽 14- 内管 15- 外管 20-安全螺帽 30-内管 10 M312611 31-内螺紋段 40-導螺桿 50- 主螺帽 51- 外螺紋 52- 頭端 5 3-尾端 54-組配空間 60-安全螺帽 61 -外輪廓 70-固定帽 71 -外螺紋M312611 VIII. New description: [New technical field] This case is related to the line thief. In more detail, it refers to the combination of the line and the main screw on the rotating rod and the safety position. An improvement is proposed for the safety nut. [Prior Art] As shown in the first figure, the linear actuator is a driving assembly 11 that utilizes the motor 10 and its gears, and the like, and drives the screw 12 to rotate, using the main screw (four) coupled to the guide tube 12. An inner tube 14 is driven to linearly expand and contract in an outer tube 15. It is used in load-bearing structures such as the rise and fall of hospital beds, or other mechanical applications that require expansion and contraction. The damage of the thread of the main screw head 13 is a problem that is often discussed, and the reason is included, including that the main nut 13 converts the rotational power of the lead screw 12 into a linear thrust and drives the main nut 13 to be connected. On the inner tube 14, the spring inner 14H moving workpiece (not shown) moves, so the main nut I3 is the main component carrying the load 'thread and guide screw (four) long time (four) (four) wear and tear $. In addition, in order to reduce the noise generated by the friction between the main nut 13 and the lead screw 12, the main nut 13 is made of (4) rubber f, but the lead screw 12 is a metal rod, and the plastic main nut 13 is The thread wear is more serious. In addition, when the internal officer 14 causes improper resistance to work objects, the main nut may have an immediate cracking damage. In any event, once the main nut 13 is damaged, it cannot afford the original load M312611, and the linear actuator loses its ability to act quickly, and the work will be quickly lost weight, causing more serious problems. In order to solve the above question 4, the manufacturer proposed a safety nut scheme. As shown in the first and second figures, a safety nut is fitted to the lead screw 12 and located inside the head end 131 of the main nut 13. When the main nut 13 is disintegrated, the function of carrying the load can be temporarily carried out by the j., and the linear _ does not immediately lose the actuation ability, forming a _ protection, improving the safety of use. • The main disadvantage of the above solution is that the safety nut 20 can only withstand the load in the opposite direction. As indicated by the arrow A in the second figure, the actuator is subjected to a thrust which is a load against the safety nut 2〇. When the main nut 13 collapses and cannot load the force in the direction of the arrow a, the driven workpiece quickly loses weight. The safety nut 2 can be used to temporarily load the load function at this time, so that the main nut 13, the inner tube 14 and the working object can be safely returned to the original position. However, when the actuator is subjected to the pulling force in the direction of the arrow B in the second figure, the "Hella force is opposite to the direction of the safety nut 20, once the main nut 13 is hot and the load is applied, Will be pulled directly by the pull and separated from the safety nut. The safety nut 20 does not function with respect to the main nut 13. Jane Lu, the safety nut 13 described above can only provide safety protection when the actuator is subjected to a thrust load, and therefore is not suitable for an actuator that is subjected to tensile force. In addition, the head end 131 of the conventional main nut 13 is received by the circular nut 132 for the circular outer contour of the safety nut 20, and the safety nut 2 is screwed to the M312611 of the main nut 13 to the limit. By the mutual force 'When the torsion force of the lead screw 12 is greater than the friction force', the safety screw _ will be rotated, and cannot be positioned by the main nut 13 'This will make the safety screw _ unable to play the above temporary The main nut 13 carries the function of a load. [New content] This case proposes a nut actuator structure with linear actuators. The safety nut can play the role of the temporary main nut bearing load when the H is subjected to tension or thrust. Security protection. In other words, the safety nut has the ability to carry loads in both directions. The linear lung-nuclear nut assembly structure of the present invention is implemented on a lead screw and an inner tube of a linear actuator; comprising: a main nut, which is assembled on the lead screw, and an outer portion and a tube end group of the inner tube a fixing cap is assembled in the tube end of the inner tube; a safety nut is assembled on the lead screw, and both ends thereof are restricted by the main nut and the fixing cap. [Embodiment] As shown in the drawings of the third, fourth and fifth figures, the case where the nut assembly structure of the present invention is implemented in a conventional linear actuator is disclosed. The elements in the figures include an inner tube 3〇, a lead screw 40, a main nut 50, a safety nut 6〇, and a fixed cap 7〇. The main nut 50 is assembled on the lead screw 40, and an external thread 51 is externally coupled to the internal thread segment 31 of the end of the inner tube M312611. The main nut 50 is defined by the two ends of its axis as the head end and the tail end 53'. The tail end 53 is provided with an assembly space 54 for the above-mentioned safety screw-cut assembly. In the embodiment of the present invention, the assembly space 54 and the safety nut 6 outside the wheel gallery 61 are polygonal, and are angularly matched to produce a snap-fit function. The above multiple (four) includes but is not limited to the hexagonal shape shown in the figure. The fixing cap 70 is combined with the external thread 71 to be positioned inside the inner tube 3'. The guide lion recognizes the towel, but does not succeed the fixing cap 7〇. 〃 When the main nut 50 and the safety nut 6〇 assembled thereto are coupled to the tube end of the inner member 30, the two ends of the safety nut 6〇 are respectively replaced by the main nut 50 and the fixed cap 7 described above. Limited. As described in the prior art, under normal circumstances, the rotation of the lead screw 4 可使 can cause the main screw (4) and the safety _ step to axially displace on it to drive the inner tube 30' to make the inner tube 3 〇 Produce a push or retreat art action to achieve a linear telescopic motion. However, when the main nut 5 〇 is broken, it is necessary to temporarily carry the load by the safety nut 6 。. It is worth noting that the safety nut 6〇 of this case has the load capacity to achieve tension and thrust. Mainly because the safety nut 6〇 is disposed at the rear end of the main nut 50 and a fixing cap 7〇 is disposed in the inner tube 3〇, the main nut training and the fixing cap 70 restrict the safety nut 6 Both ends of the crucible, therefore, can play a role when the actuator is subjected to thrust or tension. As shown in the third figure, the arrow C indicates that the actuator is subjected to a thrust. In this case, when the nut of the main nut 50 and the lead screw 40 collapses and loses the ability to be coupled to the lead screw 40, so that the thrust cannot be loaded, the thrust is caused by the fixing cap 70. The safety nut 60 is applied, and the safety nut 60 quickly functions as a temporary load bearing. As with the third figure, the arrow D indicates that the actuator is subjected to a pulling force. In this case, when the screw of the main nut 50 and the lead screw 40 collapses and loses the ability to be coupled to the lead screw 40, so that the pulling force cannot be loaded, the safety nut 60 can limit the main screw. The cap 50 prevents the main nut 5〇 from being pulled out directly by the pulling force' and the safety nut 60 is restricted by the fixing cap 70 and the main nut 5〇, so the safety nut can function as a temporary load bearing. As described above, the above-mentioned nut assembly method of the present invention can provide safety protection even when the actuator is subjected to tension or thrust, and therefore the present invention is applicable to an actuator that receives thrust and tension. Moreover, in the present case, the safety nut 60 and the main nut 50 are matched in a polygonal shape, and the main locking nut is fixed. The safety screw can be positioned by the positive nut 50 without rotating with the lead screw 4〇. The safety nut (9) completely functions as a temporary load bearing when the main nut 50 is disintegrated. Although the present case is described in terms of a preferred embodiment, those skilled in the art can make various forms of changes without departing from the spirit and scope of the present invention. The above embodiments are only used to illustrate the present case and are not intended to limit the scope of the present invention. Any modification or change that is not in violation of the spirit of the case is the scope of patent application in this case. M312611 [Simple description of the drawings] The first figure is a cross-sectional view of a conventional linear actuator. The second figure is a schematic view of a conventional linear actuator equipped with a main nut and a safety nut. The third figure is a partial cross-sectional view of the conventional nut, safety nut and fixed cap assembly of the conventional linear actuator. The fourth figure is an exploded perspective view of the main screw of the main nut, the safety nut, and the fixed cap and the conventional screw of the conventional linear actuator. Fig. 5 is a perspective exploded view showing another aspect of the component according to the fourth diagram. [Main component symbol description] 10- Motor 11-Drive assembly 12- Lead screw 13- Main nut 131- Head end 132- Carrier groove 14- Inner tube 15- Outer tube 20-Safety nut 30-Inner tube 10 M312611 31 - internal thread section 40 - lead screw 50 - main nut 51 - external thread 52 - head end 5 3-tail end 54 - assembly space 60 - safety nut 61 - outer contour 70 - fixed cap 71 - external thread