TWI814622B - Internal circulation ball screw - Google Patents

Abstract

本發明之內循環式滾珠螺桿包含一螺桿軸、一螺帽及一迴流元件，螺帽設於螺桿軸且與螺桿軸之間形成一負荷路徑，螺帽更具有一配件槽和一連通配件槽之排珠孔，迴流元件設於螺帽之配件槽內且與螺桿軸之間形成一銜接負荷路徑之非負荷路徑，兩者共同形成一供滾珠運行之循環路徑，迴流元件更具有一排珠通道，排珠通道之一端銜接該螺帽之該內螺紋槽的一無效牙區，另一端連通螺帽之排珠孔。藉此，本發明之內循環式滾珠螺桿在組裝過程中允許跑到無效牙區的滾珠經由排珠通道跑到排珠孔，再由排珠孔排出至螺帽外，以避免這些無效珠卡在無效牙區而產生阻力過大及對相關配件造成磨損的問題。 The internal circulation ball screw of the present invention includes a screw shaft, a nut and a return element. The nut is arranged on the screw shaft and forms a load path with the screw shaft. The nut has an accessory groove and a connecting accessory groove. The ball row hole, the return element is located in the accessory groove of the nut and forms a non-load path connecting the load path with the screw shaft. The two together form a circulation path for the ball to run, and the return element has a row of beads. Channel, one end of the bead row channel is connected to an ineffective tooth area of the internal thread groove of the nut, and the other end is connected to the bead row hole of the nut. In this way, the internal circulation ball screw of the present invention allows the balls that have run into the ineffective tooth area to run to the ball discharge hole through the ball discharge channel during the assembly process, and then be discharged from the ball discharge hole to the outside of the nut, thereby preventing these ineffective balls from getting stuck. In the ineffective tooth area, excessive resistance will occur and wear of related accessories will occur.

Description

內循環式滾珠螺桿 Internal circulation ball screw

本發明與滾珠螺桿有關，特別是指一種內循環式滾珠螺桿。 The present invention relates to ball screws, in particular to an internal circulation ball screw.

對於內循環式滾珠螺桿來說，若應用在小導程的場合時，如圖1所示，迴流元件1之迴流槽2通常需要作跳牙設計，以避免因相鄰二迴流槽2之間的壁厚過薄而導致迴流元件1損壞失效。然而，具有跳牙設計的迴流元件1在配合滾珠3進行組裝時，組裝人員需要非常小心盡量讓滾珠3不能掉到迴流槽2以外的地方，即使如此，仍然會有一些滾珠3在組裝過程中跑到相鄰二迴流槽2之間的無效牙區4而形成無效珠3’，一旦無效珠3’卡在無效牙區4時便無法將其取出，如此將會造成後續運行時的阻力過大，甚至會對相關配件(例如螺桿軸或螺帽)造成磨損。換言之，傳統迴流元件1在配合滾珠3進行組裝時相當費時且不方便。 For internal circulation ball screws, if they are used in small-lead applications, as shown in Figure 1, the return groove 2 of the return element 1 usually needs to be designed with jump teeth to avoid the gap between two adjacent return grooves 2. The wall thickness is too thin, causing damage and failure of the reflow element 1. However, when the return component 1 with a jump-tooth design is assembled with the balls 3, the assembler needs to be very careful to prevent the balls 3 from falling outside the return groove 2. Even so, there will still be some balls 3 during the assembly process. It runs to the ineffective tooth area 4 between two adjacent return grooves 2 to form ineffective beads 3'. Once the ineffective bead 3' is stuck in the ineffective tooth area 4, it cannot be taken out, which will cause excessive resistance during subsequent operations. , and even cause wear to related accessories (such as screw shafts or nuts). In other words, the traditional return component 1 is quite time-consuming and inconvenient to assemble with the balls 3 .

日本特許第6444760號專利案所揭露的迴流元件在二個臂部分別具有一回收口和一排放口，其中的回收口用來回收潤滑油，而排放口則是用來排放潤滑油，兩者並非用來供滾珠通過，因此也沒有辦法解決上述關於在無效牙區發生卡珠的問題。 The return element disclosed in Japanese Patent No. 6444760 has a recovery port and a discharge port on two arms respectively. The recovery port is used to recover lubricating oil, and the discharge port is used to discharge lubricating oil. Both It is not used for balls to pass through, so there is no way to solve the above-mentioned problem of ball jamming in the ineffective tooth area.

本發明之主要目的在於提供一種內循環式滾珠螺桿，其能提升組裝效率。 The main purpose of the present invention is to provide an internal circulation ball screw that can improve assembly efficiency.

為了達成上述主要目的，本發明之內循環式滾珠螺桿包含一螺桿軸、一螺帽、一封閉件、一迴流元件，以及多個滾珠。該螺桿軸具有一外螺紋槽；該螺帽套設於該螺桿軸且能沿著該螺桿軸之軸向移動，該螺帽具有一內螺紋槽，該螺帽之該內螺紋槽與該螺桿軸之該外螺紋槽之間形成一負荷路徑，另外，該螺帽更具有一徑向連通該內螺紋槽之配件槽和一徑向連通該配件槽之排珠孔；該迴流元件設於該螺帽之該配件槽內，且該迴流元件之內側面具有一迴流槽，該迴流元件之該迴流槽銜接該螺帽之該內螺紋槽且與該螺桿軸之該外螺紋槽之間形成一非負荷路徑，該非負荷路徑銜接該負荷路徑而與該負荷路徑形成一供該等滾珠運行之循環路徑，另外，該迴流元件更具有一鄰接該迴流槽之排珠通道，該排珠通道貫穿該迴流元件之內外二側面，該排珠通道之一端銜接該螺帽之該內螺紋槽的一無效牙區，該排珠通道之另一端連通該螺帽之該排珠孔。 In order to achieve the above main purpose, the internal circulation ball screw of the present invention includes a screw shaft, a nut, a closing member, a return element, and a plurality of balls. The screw shaft has an external thread groove; the nut is sleeved on the screw shaft and can move along the axial direction of the screw shaft; the nut has an internal thread groove; the internal thread groove of the nut is in contact with the screw shaft. A load path is formed between the external thread grooves of the shaft. In addition, the nut has an accessory groove that is radially connected to the internal thread groove and a bead row hole that is radially connected to the accessory groove; the return element is located on the There is a return groove in the accessory groove of the nut, and there is a return groove on the inner surface of the return element. The return groove of the return element is connected with the internal thread groove of the nut and forms a gap with the external thread groove of the screw shaft. The non-load path is connected to the load path and forms a circulation path for the balls to run. In addition, the return element has a bead discharge channel adjacent to the return groove, and the bead discharge channel runs through the On the inner and outer sides of the return element, one end of the bead row channel is connected to an ineffective tooth area of the internal thread groove of the nut, and the other end of the bead row channel is connected to the bead row hole of the nut.

從上述可知，本發明之內循環式滾珠螺桿在組裝過程中允許跑到該迴流槽以外的無效珠從該排珠通道到達該排珠孔，再由該排珠孔排出至該螺帽外，等到全部滾珠組裝完畢之後，再將該封閉件封住該排珠孔，如此即可解決無效珠卡在該螺帽內部而產生阻力過大及對相關配件造成磨損的問題。 It can be seen from the above that during the assembly process of the internal circulation ball screw of the present invention, the ineffective beads that run out of the return groove are allowed to reach the bead discharge hole from the bead discharge channel, and then be discharged from the bead discharge hole to the outside of the nut. After all the balls are assembled, the sealing member is used to seal the row of ball holes. This can solve the problem of excessive resistance caused by invalid balls stuck inside the nut and wear of related accessories.

較佳地，該迴流元件具有二該排珠通道，該等排珠通道之延伸方向相反且相互錯開，如此可以允許該無效珠進入其中一該排珠通道內，有助於將該無效珠確實排出至該螺帽外。 Preferably, the return element has two bead row channels, and the extending directions of the bead row channels are opposite and staggered with each other. This allows the ineffective beads to enter one of the bead row channels, which helps to ensure that the ineffective beads are drain out of the nut.

較佳地，該排珠通道具有一入口和一出口，該入口形成於該迴流元件之內側面，該出口形成於該迴流元件之外側面且連通該螺帽之該排珠孔。藉此，該無效珠從該入口進入該排珠通道，再由該出口到達該排珠孔。 Preferably, the bead discharge channel has an inlet and an outlet, the inlet is formed on the inner side of the return element, and the outlet is formed on the outer side of the return element and communicates with the bead discharge hole of the nut. Thereby, the ineffective beads enter the bead row channel from the inlet, and then reach the bead row hole from the outlet.

較佳地，該迴流元件更具有一鄰接該入口之導引凸部，藉由該導引凸部導引該無效珠進入該排珠通道內。 Preferably, the return element has a guide protrusion adjacent to the inlet, and the ineffective beads are guided into the bead discharge channel by the guide protrusion.

較佳地，該螺帽之內周面具有一第一凹槽，該迴流元件之內側面具有一第二凹槽，該第一凹槽和該第二凹槽相互銜接而形成該排珠通道之一入口，該排珠通道更具有一出口，該出口形成於該迴流元件之外側面且連通該螺帽之該排珠孔。藉此，該無效珠從該入口進入該排珠通道，再由該出口到達該排珠孔。 Preferably, the nut has a first groove on its inner surface, and the return element has a second groove on its inner surface. The first groove and the second groove are connected with each other to form the bead discharge channel. An inlet, the bead discharge channel has an outlet, the outlet is formed on the outer side of the return element and communicates with the bead discharge hole of the nut. Thereby, the ineffective beads enter the bead row channel from the inlet, and then reach the bead row hole from the outlet.

較佳地，本發明之內循環式滾珠螺桿更包含一設於該螺帽之該排珠孔內的封閉件，用以封閉該排珠孔。 Preferably, the internal circulation ball screw of the present invention further includes a closing member disposed in the bead row hole of the nut for closing the bead row hole.

有關本發明所提供對於內循環式滾珠螺桿的詳細構造、特點、組裝或使用方式，將於後續的實施方式詳細說明中予以描述。然而，在本發明領域中具有通常知識者應能瞭解，該等詳細說明以及實施本發明所列舉的特定實施例，僅係用於說明本發明，並非用以限制本發明之專利申請範圍。 The detailed structure, features, assembly or usage of the internal circulation ball screw provided by the present invention will be described in the subsequent detailed description of the implementation. However, those with ordinary knowledge in the field of the present invention should understand that these detailed descriptions and specific examples for implementing the present invention are only used to illustrate the present invention and are not intended to limit the scope of the patent application of the present invention.

1:迴流元件 1:Reflow component

2:迴流槽 2: Return tank

3:滾珠 3: Ball

3’:無效珠 3’: Invalid beads

4:無效牙區 4: Invalid tooth area

10:內循環式滾珠螺桿 10: Internal circulation ball screw

20:螺桿軸 20:Screw shaft

22:外螺紋槽 22: External thread groove

30:螺帽 30: Nut

32:內螺紋槽 32: Internal thread groove

34:配件槽 34:Accessory slot

36:排珠孔 36: row of bead holes

38:封閉件 38: closure

40:迴流元件 40:Reflow components

41:內側面 41: Medial side

42:外側面 42:Outer side

43:迴流槽 43: Return tank

44:排珠通道 44:Bead row channel

45:入口 45:Entrance

46:出口 46:Export

47:導引凸部 47:Guide convex part

50:滾珠 50: Ball

50’:無效珠 50’: Invalid beads

52:負荷路徑 52: Load path

54:非負荷路徑 54: Non-load path

56:循環路徑 56:Cycle path

58:無效牙區 58: Invalid tooth area

59:有效牙區 59: Effective tooth area

60:中空管 60:Hollow tube

70:螺帽 70: Nut

72:第一凹槽 72: First groove

80:迴流元件 80:Reflow components

82:第二凹槽 82: Second groove

圖1為習用迴流元件組裝於螺帽的局部剖視圖。 Figure 1 is a partial cross-sectional view of a conventional reflow element assembled on a nut.

圖2為本發明第1實施例之內循環式滾珠螺桿的立體圖。 Figure 2 is a perspective view of an internal circulation ball screw according to the first embodiment of the present invention.

圖3為本發明第1實施例之內循環式滾珠螺桿的立體分解圖。 FIG. 3 is an exploded perspective view of the internal circulation ball screw according to the first embodiment of the present invention.

圖4為本發明第1實施例之內循環式滾珠螺桿的剖視圖。 4 is a cross-sectional view of an internal circulation ball screw according to the first embodiment of the present invention.

圖5為本發明第1實施例之內循環式滾珠螺桿所提供之迴流元件的頂視立體圖。 5 is a top perspective view of the return component provided by the internal circulation ball screw according to the first embodiment of the present invention.

圖6為本發明第1實施例之內循環式滾珠螺桿所提供之迴流元件的底視立體圖 Figure 6 is a bottom perspective view of the return component provided by the internal circulation ball screw according to the first embodiment of the present invention.

圖7為本發明第1實施例之內循環式滾珠螺桿省略螺桿軸的軸向局部剖視圖。 7 is an axial partial cross-sectional view of the internal circulation ball screw omitting the screw shaft according to the first embodiment of the present invention.

圖8為本發明第1實施例之內循環式滾珠螺桿省略螺桿軸和封閉件的徑向剖視圖。 8 is a radial cross-sectional view of the internal circulation ball screw in the first embodiment of the present invention, omitting the screw shaft and the closing member.

圖9類同圖8，主要顯示中空管之一端***排珠通道內。 Figure 9 is similar to Figure 8, mainly showing that one end of the hollow tube is inserted into the bead row channel.

圖10為本發明第2實施例之內循環式滾珠螺桿省略螺桿軸的局部剖視圖。 10 is a partial cross-sectional view of an internal circulation ball screw omitting the screw shaft according to the second embodiment of the present invention.

申請人首先在此說明，於整篇說明書中，包括以下介紹的實施例以及申請專利範圍的請求項中，有關方向性的名詞皆以圖式中的 方向為基準。其次，在以下將要介紹之實施例以及圖式中，相同之元件標號，代表相同或近似之元件或其結構特徵。 The applicant would like to first explain that throughout the specification, including the embodiments introduced below and the claims within the scope of the patent application, all terms related to directionality are represented by those in the drawings. direction as the base. Secondly, in the embodiments and drawings to be introduced below, the same component numbers represent the same or similar components or structural features.

請參閱圖2及圖3，本發明第1實施例之內循環式滾珠螺桿10包含有一螺桿軸20、一螺帽30、一封閉件38、一迴流元件40，以及多個滾珠50。 Referring to FIGS. 2 and 3 , the internal circulation ball screw 10 according to the first embodiment of the present invention includes a screw shaft 20 , a nut 30 , a closing member 38 , a return component 40 , and a plurality of balls 50 .

螺桿軸20之外周面具有一沿其軸向延伸之外螺紋槽22。 The outer peripheral surface of the screw shaft 20 has an external thread groove 22 extending along its axial direction.

螺帽30套設於螺桿軸20且能沿著螺桿軸20之軸向移動。螺帽30之內周面具有一內螺紋槽32和一徑向連通內螺紋槽32之配件槽34，螺帽30之內螺紋槽32與螺桿軸20之外螺紋槽22之間形成一負荷路徑52(如圖4所示)。此外，螺帽30還具有一貫穿內外周面之排珠孔36，排珠孔36徑向連通配件槽34。 The nut 30 is sleeved on the screw shaft 20 and can move along the axial direction of the screw shaft 20 . The inner circumferential surface of the nut 30 has an internal thread groove 32 and an accessory groove 34 that radially communicates with the internal thread groove 32. A load path is formed between the internal thread groove 32 of the nut 30 and the external thread groove 22 of the screw shaft 20. 52 (as shown in Figure 4). In addition, the nut 30 also has a bead row hole 36 penetrating the inner and outer peripheral surfaces, and the bead row hole 36 is radially connected to the accessory groove 34 .

封閉件38可以用緊配、黏合或其他方式安裝於螺帽30之排珠孔36內，用以封閉排珠孔36。 The closing member 38 can be installed in the bead row hole 36 of the nut 30 by tight fitting, gluing or other means to close the bead row hole 36 .

迴流元件40設於螺帽30之配件槽34內。如圖5及圖6所示，迴流元件40之內側面41具有三間隔設置之迴流槽43，迴流元件40之該等迴流槽43銜接螺帽30之內螺紋槽32且與螺桿軸20之外螺紋槽22之間形成一銜接負荷路徑52之非負荷路徑54(如圖4所示)，使得非負荷路徑54和負荷路徑52形成一供該等滾珠50運行之循環路徑56(如圖4所示)。此外，如圖5及圖6所示，迴流元件40在相鄰二迴流槽43之間具有二排珠通道44(實際上只要至少一個即可)，各排珠通道44之一端銜接螺帽30之內螺紋槽32的無效牙區58(如圖7所示)，另一端連通螺帽30之排珠孔36，該等排珠通道44之延伸方向相反且以前後位置相互錯開的 方式設置，各排珠通道44貫穿迴流元件40之內外二側面41、42，且各排珠通道44具有一入口45和一出口46，在本實施例中，入口45形成於迴流元件40之內側面41，出口46形成於迴流元件40之外側面42。再如圖5所示，迴流元件40之內側面具有四導引凸部47，該等導引凸部47以一對一的方式鄰接該等入口45。此處，如圖7所示，無效牙區58指的是滾珠50在螺帽30與螺桿軸20之間循環滾動時不會流經的區域，反之，有效牙區59指的是滾珠50在螺帽30與螺桿軸20之間循環滾動時會流經的區域。 The return component 40 is disposed in the fitting groove 34 of the nut 30 . As shown in Figures 5 and 6, the inner side 41 of the return element 40 has three spaced return grooves 43. The return grooves 43 of the return element 40 are connected to the internal thread groove 32 of the nut 30 and outside the screw shaft 20. A non-load path 54 connecting the load path 52 is formed between the thread grooves 22 (as shown in FIG. 4 ), so that the non-load path 54 and the load path 52 form a circulation path 56 for the balls 50 to run (as shown in FIG. 4 Show). In addition, as shown in FIGS. 5 and 6 , the return element 40 has two rows of bead channels 44 between two adjacent return grooves 43 (actually at least one is sufficient), and one end of each bead channel 44 is connected to the nut 30 The other end of the ineffective tooth area 58 of the internal thread groove 32 (as shown in Figure 7) is connected to the bead row hole 36 of the nut 30. The extension directions of the bead row channels 44 are opposite and are staggered from front to back. Each bead row channel 44 runs through the inner and outer side surfaces 41 and 42 of the return element 40 , and each bead row channel 44 has an inlet 45 and an outlet 46 . In this embodiment, the inlet 45 is formed inside the return element 40 On the side 41 , the outlet 46 is formed on the side 42 outside the return element 40 . As shown in FIG. 5 , the inner surface of the return element 40 has four guide protrusions 47 , and the guide protrusions 47 are adjacent to the inlets 45 in a one-to-one manner. Here, as shown in FIG. 7 , the ineffective tooth area 58 refers to the area where the ball 50 does not flow when it circulates between the nut 30 and the screw shaft 20 . On the contrary, the effective tooth area 59 refers to the area where the ball 50 does not flow. The area that flows between the nut 30 and the screw shaft 20 during cyclic rolling.

由上述可知，在配合滾珠50進行組裝時，一旦有滾珠50跑到相鄰二迴流槽43之間的無效牙區58時，這些滾珠50即視為無效珠50’，如圖7及圖8所示，上述無效珠50’會受到導引凸部47的導引而從入口45進入排珠通道44內，接著從出口46抵達排珠孔36，最後再由排珠孔36直接排出至螺帽30外，如此即可解決無效珠50’卡在無效牙區58的問題，等到所有滾珠50都組裝完畢之後，最後再將封閉件38封住排珠孔36，以避免螺帽30外部的異物入侵。 It can be seen from the above that when assembling with the balls 50 , once the balls 50 run into the inactive tooth area 58 between two adjacent return grooves 43 , these balls 50 are regarded as inactive balls 50 ′, as shown in Figures 7 and 8 As shown, the above-mentioned ineffective beads 50' will be guided by the guide convex portion 47 and enter the bead discharge channel 44 from the inlet 45, then arrive at the bead discharge hole 36 from the outlet 46, and finally be discharged directly from the bead discharge hole 36 to the screw. Outside the cap 30, this can solve the problem of the invalid balls 50' being stuck in the invalid tooth area 58. After all the balls 50 are assembled, finally seal the ball row hole 36 with the closing member 38 to avoid the outside of the nut 30. Foreign body invasion.

另一方面，為了讓無效珠50’可以更順利的排出，如圖9所示，可以進一步將一中空管60經由出口46***排珠通道44內，並對排珠通道44進行吹氣或吸氣，藉由氣體的壓力將無效珠50’更快的排出至螺帽30外，以提升組裝效率。 On the other hand, in order to allow the invalid beads 50' to be discharged more smoothly, as shown in Figure 9, a hollow tube 60 can be further inserted into the bead discharge channel 44 through the outlet 46, and the bead discharge channel 44 can be blown or Inhale and use the pressure of the gas to expel the invalid beads 50' to the outside of the nut 30 faster to improve assembly efficiency.

在此需要補充說明的是，在上述實施例中，排珠通道44之入口45形成於迴流元件40之內側面41，然而實際上，排珠通道44之入口45亦可形成於螺帽70和迴流元件80之間，如圖10所示，螺帽70之內周面具有一第一凹槽72，迴流元件80之內側面具有一第二凹槽82，第一凹槽 72和第二凹槽82相互銜接而形成排珠通道44之入口45，如此的結構設計也能讓無效珠50’從入口45進入排珠通道44內來達到排珠效果。 What needs to be supplemented here is that in the above embodiment, the inlet 45 of the bead discharge channel 44 is formed on the inner side 41 of the return element 40. However, in fact, the inlet 45 of the bead discharge channel 44 can also be formed on the nut 70 and the inner side 41 of the return element 40. Between the return components 80, as shown in Figure 10, there is a first groove 72 on the inner surface of the nut 70, and a second groove 82 on the inner surface of the return component 80. The first groove 72 and the second groove 82 are connected with each other to form the entrance 45 of the bead discharge channel 44. Such a structural design can also allow the ineffective beads 50' to enter the bead discharge channel 44 from the entrance 45 to achieve the bead discharge effect.

綜上所陳，本發明之內循環式滾珠螺桿10在組裝過程中允許跑到無效牙區58的無效珠50’從排珠通道44經由排珠孔36排出至螺帽30外，如此即可解決因無效珠50’卡在無效牙區58所產生之阻力過大及對相關配件造成磨損的問題，進而達到提升組裝效率的功效。 To sum up, during the assembly process of the internal circulation ball screw 10 of the present invention, the ineffective beads 50' that run into the ineffective tooth area 58 are allowed to be discharged from the bead discharge channel 44 to the outside of the nut 30 through the bead discharge hole 36, so that This solves the problem of excessive resistance caused by the invalid beads 50' being stuck in the invalid tooth area 58 and causing wear to related accessories, thereby achieving the effect of improving assembly efficiency.

40:迴流元件 40:Reflow components

41:內側面 41: Medial side

43:迴流槽 43: Return tank

44:排珠通道 44:Bead row channel

45:入口 45:Entrance

46:出口 46:Export

47:導引凸部 47:Guide convex part

Claims (6)

一種內循環式滾珠螺桿，包含: 一螺桿軸，具有一外螺紋槽； 一螺帽，套設於該螺桿軸且能沿著該螺桿軸之軸向移動，該螺帽具有一內螺紋槽，該螺帽之該內螺紋槽與該螺桿軸之該外螺紋槽之間形成一負荷路徑，該螺帽更具有一徑向連通該內螺紋槽之配件槽和一徑向連通該配件槽之排珠孔； 一迴流元件，設於該螺帽之該配件槽內，該迴流元件之內側面具有一迴流槽，該迴流元件之該迴流槽銜接該螺帽之該內螺紋槽且與該螺桿軸之該外螺紋槽之間形成一非負荷路徑，該非負荷路徑銜接該負荷路徑而與該負荷路徑形成一循環路徑，該迴流元件更具有至少一鄰設於該迴流槽之排珠通道，該至少一排珠通道貫穿該迴流元件之內外二側面，該至少一排珠通道之一端銜接該螺帽之該內螺紋槽的一無效牙區，該排珠通道之另一端連通該螺帽之該排珠孔；以及 多個滾珠，設於該循環路徑。 An internal circulation ball screw, including: a screw shaft having an external thread groove; A nut that is sleeved on the screw shaft and can move along the axial direction of the screw shaft. The nut has an internal thread groove. There is a gap between the internal thread groove of the nut and the external thread groove of the screw shaft. Forming a load path, the nut has an accessory groove radially connected to the internal thread groove and a bead row hole radially connected to the accessory groove; A return flow element is provided in the fitting groove of the nut. The inner surface of the return flow element has a return groove. The return groove of the return flow element is connected with the internal thread groove of the nut and with the outer surface of the screw shaft. A non-load path is formed between the thread grooves, and the non-load path is connected to the load path and forms a circulation path with the load path. The return element further has at least one bead row channel adjacent to the return groove, and the at least one bead row channel The channel penetrates the inner and outer sides of the return element, one end of the at least one bead row channel is connected to an ineffective tooth area of the internal thread groove of the nut, and the other end of the bead row channel is connected to the bead row hole of the nut; as well as A plurality of balls are provided on the circulation path. 如請求項1所述之內循環式滾珠螺桿，其中，該迴流元件具有二該排珠通道，該等排珠通道之延伸方向相反且相互錯開。The internal circulation ball screw as claimed in claim 1, wherein the return element has two ball discharge channels, and the extending directions of the ball discharge channels are opposite and staggered from each other. 如請求項1或2所述之內循環式滾珠螺桿，其中，該排珠通道具有一入口和一出口，該入口形成於該迴流元件之內側面，該出口形成於該迴流元件之外側面且連通該螺帽之該排珠孔。The internal circulation ball screw as claimed in claim 1 or 2, wherein the ball discharge channel has an inlet and an outlet, the inlet is formed on the inner side of the return element, the outlet is formed on the outer side of the return element, and Connect the row of bead holes of the nut. 如請求項3所述之內循環式滾珠螺桿，其中，該迴流元件更具有一鄰接該入口之導引凸部。The internal circulation ball screw as claimed in claim 3, wherein the return component further has a guide convex portion adjacent to the inlet. 如請求項1或2所述之內循環式滾珠螺桿，其中，該螺帽之內周面具有一第一凹槽，該迴流元件之內側面具有一第二凹槽，該第一凹槽和該第二凹槽相互銜接而形成該排珠通道之一入口，該排珠通道更具有一出口，該出口形成於該迴流元件之外側面且連通該螺帽之該排珠孔。The internal circulation ball screw as claimed in claim 1 or 2, wherein the nut has a first groove on its inner circumferential surface, and the return element has a second groove on its inner surface, and the first groove and The second grooves are connected with each other to form an inlet of the bead discharge channel. The bead discharge channel has an outlet. The outlet is formed on the outer side of the return element and communicates with the bead discharge hole of the nut. 如請求項1所述之內循環式滾珠螺桿，更包含一設於該螺帽之該排珠孔內的封閉件，該封閉件用以封閉該排珠孔。The internal circulation ball screw as described in claim 1 further includes a closing member disposed in the bead row hole of the nut, and the closing member is used to close the bead row hole.

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