TWI717681B - Rolling body screw device - Google Patents

Abstract

Provided is a rolling element screw device, which can easily locate and fix circulating components.

The rolling element screw device 10 is provided with: a screw shaft 11 having a rolling element rolling groove 11a; a nut 21 having a loaded rolling element rolling groove 21d; and a return path 27 connecting the rolling element rolling groove 11a and One end and the other end of the loaded rolling element rolling path between the loaded rolling element rolling groove 21d; and a plurality of rolling elements 13. The nut 21 is provided with a nut body 21a formed with load rolling element rolling grooves 21d, and a plurality of circulating members 24 respectively mounted on both end surfaces of the nut body 21a, and the nut body 21a is attached to the nut body 21a The two ends of the two ends respectively have a circulation member mounting hole 25 that is larger than the circulation member 24. The circulation member 24 is set behind the circulation member mounting hole 25, and the circulation member 24 is formed with a recess 27c on the nut 21 side and the circulation member 24 After the center position of the convex portion 24a is rotated as the center of rotation, the fixing means 26 is provided and is attached to the nut body 21a.

Description

Rolling body screw device

The present invention relates to a rolling element screw device, which interposes a rolling element between a screw shaft and a nut so that the rolling element can roll, and is constructed in a way that the rolling element can circulate.

Ball screw, roller screw, etc. rolling element screw device, which is provided with: screw shaft; nut; ball, roller, etc. rolling elements, which are interposed between the screw shaft and the nut; and circulating members, which make the rolling elements perform Infinite loop. The rolling element screw device has the characteristic of obtaining a brisk motion by the rolling motion of the rolling element, and it has been widely used as a mechanical element that converts rotary motion into linear motion or converts linear motion into rotary motion.

A spiral rolling element rolling groove is formed on the outer peripheral surface of the screw shaft. On the other hand, a spiral loaded rolling element rolling groove facing the rolling element rolling groove of the screw shaft is formed on the inner peripheral surface of the nut. The spiral load rolling element rolling path between the rolling element rolling groove of the screw shaft and the load rolling element rolling groove of the nut has a plurality of rolling elements arranged in a rolling motion. In addition, a circulation member for circulating the rolling elements is provided on the nut. At least a part of a return path connecting one end and the other end of the rolling groove of the load rolling element of the spiral is formed on the circulating member. If the screw shaft is relatively rotated with respect to the nut, the rolling element will roll in the rolling path of the loaded rolling element. The rolling element that rolls to the end of the rolling groove of the load rolling element of the nut is tied by The return path of the circulating member returns to the other end of the rolling groove of the loaded rolling element. Furthermore, as a prior art document showing such a rolling element screw device, there is Patent Document 1 described below.

[Prior Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Laid-Open No. 2015-143527

However, in the rolling element screw device in which the above-mentioned circulation member is arranged at both ends of the nut, the rolling groove of the rolling element of the spiral formed on the outer peripheral surface of the screw shaft is not formed to the shaft end of the screw shaft In the case of the so-called screw shaft without cutting grooves at both ends, in order to avoid the interference between the lip of the circulating component and the screw shaft during manufacturing, the screw shaft is usually installed in the prior art to avoid interference with the lip Work on the structure of the circulation member by making the circulation member into a divided body, etc. Although the structure of this prior art is simple, it will cause increase in screw shaft machining and increase in assembly man-hours, and there is a cost issue.

The present invention was completed in view of the above-mentioned problems in the prior art, and its object is to provide a rolling element screw device, which can easily perform positioning and fixing of the circulating members arranged at the two ends of the nut The structure can reduce manufacturing costs.

The rolling element screw device of the present invention is provided with: a screw shaft having a spiral rolling element rolling groove on the outer peripheral surface; and a nut having the same as the above on the inner peripheral surface The load rolling groove of the rolling element opposite to the rolling groove of the rolling element; the return path connecting the rolling groove of the rolling element of the screw shaft and the load of the screw between the rolling groove of the load rolling element of the nut One end and the other end of the rolling element rolling path; and a plurality of rolling elements arranged in the load rolling element rolling path and the return path, wherein the nut is provided with a rolling groove formed with the load rolling element A nut body and a plurality of circulating members respectively installed on both end faces of the nut body and forming at least a part of the return path. The nut system has a higher value than the circulating member on both end faces of the nut body. A circulation member mounting hole with a large outer shape, the circulation member is installed after the circulation member mounting hole, and the circulation member is rotated with the center position of the concave portion on the nut side and the convex portion of the circulation member as the center of rotation , The installation of the nut body is carried out by providing a fixing means.

According to the present invention, it is possible to provide a rolling element screw device, which can reduce the manufacturing cost by providing a structure that can easily perform positioning and fixing of the circulating members arranged at both ends of the nut. In addition, the present invention is suitably applied to a rolling element screw device using a screw shaft with no grooves at both ends.

10, 100, 200‧‧‧Ball screw device (rolling element screw device)

11‧‧‧Screw shaft

11a‧‧‧Ball rolling groove (rolling element rolling groove)

13‧‧‧Ball (rolling element)

21‧‧‧Nut

21a‧‧‧Nut body

21b‧‧‧Flange

21c‧‧‧Mounting hole

21d‧‧‧Loaded ball rolling groove (loaded rolling element rolling groove)

24, 124, 224‧‧‧end component (circular component)

24a, 124a, 224a‧‧‧ convex

24b, 124b, 224b‧‧‧lip

25, 125, 225‧‧‧End component mounting hole (recirculating component mounting hole)

26、126、226‧‧‧Partition member (fixing means)

27‧‧‧Return Path

27a‧‧‧Through hole

27b‧‧‧Turning part

27c‧‧‧Recess

28‧‧‧Plate

124c‧‧‧trapezoidal groove

126a‧‧‧trapezoidal convex

224c‧‧‧Bolt mounting hole

225a‧‧‧Screw hole (fixing means)

226‧‧‧Bolt (fixing means)

Fig. 1 is a perspective view showing the appearance of a ball screw device as a rolling element screw device of this embodiment.

Fig. 2 is an exploded perspective view of the ball screw device shown in Fig. 1.

Fig. 3 is a schematic diagram for explaining the schematic configuration of the circulation path of the ball screw device shown in Fig. 1.

Figure 4 is an external perspective view for explaining the detailed structure and assembly sequence of the ball screw device of this embodiment, showing the assembly in the order of the sub-pictures (a), (b), (c), (d) in the figure situation.

Figure 5 is a front view of the nut viewed from the flange side to illustrate the detailed structure and assembly sequence of the ball screw device of this embodiment, and shows the sub-pictures (a), (b), (c) in the figure ), (d) the order of assembly.

Figure 6 is a perspective view of the appearance of the detailed structure and assembly sequence of the ball screw device of the modification of the present invention, shown in the order of the sub-figure (a), (b), (c), (d) in the figure The state of assembly.

7 is a front view of the nut viewed from the flange side to illustrate the detailed structure and assembly sequence of the ball screw device of the modification of the present invention, and shows the sub-pictures (a), (b), (c), (d) the order of assembly.

8 is a perspective view of the appearance of the detailed structure and assembly sequence of the ball screw device of another modification of the present invention, showing the sub-pictures (a), (b), (c), (d) of the figure The state of assembly in order.

9 is a front view of the nut viewed from the flange side to illustrate the detailed structure and assembly sequence of the ball screw device of another modification of the present invention, and shows the sub-pictures (a), (b) ), (c), (d) the order of assembly.

Hereinafter, a preferred embodiment for implementing the present invention will be described using drawings. In addition, the following embodiments do not limit the inventors of each claim, and all the feature combinations described in the embodiments are not necessary for the solution of the invention.

First, referring to Figures 1 to 3, the rolling element screw of this embodiment The basic structure of the device is explained. In addition, in this embodiment, a rolling element screw device configured as a ball screw device using balls as rolling elements is illustrated and described. 1 is a perspective view showing the appearance of a ball screw device as a rolling element screw device of the present embodiment. In addition, FIG. 2 is an exploded perspective view of the ball screw device shown in FIG. 1, and FIG. 3 is a schematic diagram for explaining the schematic configuration of the circulation path of the ball screw device shown in FIG. 1. As shown in FIG. 1, the ball screw device 10 of this embodiment includes: a screw shaft 11; and a nut 21, which is arranged to surround the outer side of the screw shaft 11, and has an axis line with the screw shaft 11 Common.

The screw shaft 11 is a member in which a spiral ball rolling groove 11a is formed as a rolling groove of a rolling element on the outer peripheral surface of a long rod-shaped shaft. The ball rolling groove 11a formed on the outer peripheral surface of the screw shaft 11 is formed as a spiral rolling element rolling groove having a certain lead. The cross-sectional shape of the ball rolling groove 11a of the present embodiment is a Goethe-style arched groove combining two arcs. The radius of the arc of the Goethe-style arched groove is formed in a way that is larger than the radius of the ball 13 (refer to Figure 3). Therefore, the ball 13 of this embodiment is in contact with the ball rolling groove 11a of the screw shaft 11 at two points. Furthermore, the number of ball rolling grooves 11a can be appropriately set to one, two, three, etc.

The nut 21 is configured to include a nut main body 21a formed in a cylindrical shape and a flange 21b provided at one end of the nut main body 21a in the axial direction. The flange 21b has an attachment hole 21c for attaching the nut 21 to the target member. On the inner peripheral surface of the nut 21, there is formed a load ball rolling groove 21d (refer to FIG. 3) which is spirally opposed to the ball rolling groove 11a of the screw shaft 11 as a load rolling element rolling groove. The lead and the number of the loaded ball rolling groove 21d are formed in a manner equal to the lead and the number of the ball rolling groove 11a. The cross-sectional shape of the loaded ball rolling groove 21d is also Combine 2 circular arc Gothic arch grooves.

In addition, as shown in FIG. 2, a pair of end members 24 as circulating members for circulating the balls 13 as rolling elements are attached to both ends in the axial direction of the nut body 21a. 2 only shows the end member 24 on the front side of the nut 21, but the same end member 24 is also provided on the rear side of the nut 21. As shown in FIG. 2, a terminal member mounting hole 25 is formed on the end surface of the nut body 21a in the axial direction to install the terminal member 24 as a circulating member mounting hole. The terminal member 24 is inserted into the terminal member mounting hole 25 formed in the nut body 21a and installed. The details will be described later. The terminal member 24 inserted into the terminal member mounting hole 25 corresponds to the clearance space generated between the terminal member 24 and the terminal member mounting hole 25, and the position is implemented by installing the spacer member 26 as a fixing means. fixed. From this state, the plates 28 are attached to both ends of the nut body 21a in the axial direction. By installing the plate 28, the ball screw device 10 of this embodiment is completed.

Among them, referring to FIG. 3, the internal structure of the ball screw device 10 of this embodiment will be described. In addition, in FIG. 3, for the convenience of description, a schematic configuration of the ball screw device 10 in a state where the flange 21b and the plate 28 are omitted is shown. In the ball screw device 10 of this embodiment, a plurality of balls 13 are arranged between the ball rolling groove 11a of the screw shaft 11 and the load ball rolling groove 21d of the nut body 21a. A loaded ball rolling path is arranged between the ball rolling groove 11a of the screw shaft 11 and the loaded ball rolling groove 21d of the nut body 21a. In this loaded ball rolling path, the ball 13 rolls while bearing the load between the nut 21 and the screw shaft 11.

A return path 27 connecting one end and the other end of the loaded ball rolling groove 21d is formed in the nut body 21a. There are also multiple balls arranged in the return path 27 13. A through hole 27a parallel to the axis of the nut 21 is formed in the nut body 21a. End members 24 are arranged at both ends of the through hole 27a of the nut body 21a. The return path 27 is formed by the through hole 27a of the nut body 21a and the turning part 27b of the end member 24. The ball 13 rolling to one end of the load ball rolling groove 21d enters the return path 27, and then returns to the other end of the load ball rolling groove 21d via the return path 27. Then, it rolls to one end of the load ball rolling groove 21d again. The inner diameter of the return path 27 is larger than the diameter of the ball 13. In the return path 27 described above, the ball 13 rolls in a no-load state where its self-load is released.

Above, the basic structure of the ball screw device 10 of the present embodiment has been described. Next, FIG. 4 and FIG. 5 are added to the reference drawings, and the characteristic structure of the ball screw device 10 of this embodiment will be described. Among them, FIG. 4 is a perspective view of the appearance of the detailed structure and assembly sequence of the ball screw device of this embodiment, and it is shown in the order of (a), (b), (c), (d) in the figure The state of assembly. In addition, FIG. 5 is a front view illustrating the detailed structure and assembly sequence of the ball screw device of this embodiment when the nut is viewed from the flange side, and shows the sub-pictures (a) and (b) of the figure. , (C), (d) the order of assembly. Furthermore, the sub-maps (a), (b), (c), and (d) shown in FIG. 4 and FIG. 5 are corresponding diagrams, respectively.

As shown in the sub-figure (a) in Figs. 2 and 4, the terminal member 24 as the circulating member of the present embodiment is formed by forming a convex portion 24a at a portion connected to the through hole 27a of the nut body 21a. In addition, as shown in the sub-figure (b) in FIG. 5, a lip 24b is formed on the end member 24 at a position opposite to the side on which the convex portion 24a is formed. The lip portion 24b is a member that protrudes into the ball rolling groove 11a of the screw shaft 11 in the installed state to play the function of picking up the ball 13 rolling from the loaded ball rolling path to the return path 27. Therefore, roll to one end of the loaded ball rolling groove 21d The ball 13 is lifted by the lip 24b of the end member 24 provided on the one end side, and moves from the loaded area, that is, the loaded ball rolling path, toward the unloaded area, that is, the revolving portion 27b of the end member 24, Then, from the turning part 27b of the end member 24 through the through hole 27a of the nut body 21a and the turning part 27b of the end member 24 provided on the other end of the load ball rolling groove 21d, it returns to the load ball rolling groove The other end of 21d. Then, it rolls to one end of the load ball rolling groove 21d again.

In addition, although the above-mentioned terminal member 24 is provided in the terminal member mounting holes 25 as the circulating member mounting holes formed on the both end faces of the nut body 21a, as shown in the sub-figure (a) in FIG. 5, this embodiment The terminal member mounting hole 25 of the form has a recess 27c formed at the entrance of the through hole 27a. The concave portion 27c is formed in a size corresponding to the convex portion 24a in such a manner that it can be inserted into the convex portion 24a formed by the terminal member 24.

And, as shown in the comparison between the sub-maps (b) and (c) in FIG. 4 and the sub-maps (b) and (c) in FIG. 5, the terminal member mounting hole 25 of this embodiment is configured as It has a larger space than the outer shape of the end member 24. Therefore, in the manufacture of the ball screw device 10 of the present embodiment, when the terminal member 24 is installed in the terminal member mounting hole 25 in the state where the screw shaft 11 and the nut 21 are assembled, as shown in the sub-figure in FIG. 5 ( As shown in b), the end member 24 can be installed in the end member mounting hole 25 with the lip 24b avoiding the screw shaft 11. Then, from the state shown in the sub-figure (b) in FIG. 5, in the terminal member mounting hole 25, the terminal member 24 is turned toward the screw shaft 11 with the center position of the convex portion 24a and the concave portion 27c indicated by the symbol X as the rotation center The side rotation causes the lip portion 24b to protrude into the ball rolling groove 11a of the screw shaft 11 (refer to the sub-figure (c) in FIG. 5).

Then, from the sub-map (c) in Figure 4 and the sub-map (c) in Figure 5 as shown State, insert the spacer member 26 as a fixing means to fill the gap generated between the terminal member mounting hole 25 and the terminal member 24, thereby completing the installation of the terminal member 24 to the terminal member mounting hole 25 (see Figure Figure 4 (d) and Figure 5 (d)). In addition, the spacer member 26 of the present embodiment is configured as a key member formed of a metal material, and is formed in a cubic shape. On the other hand, as shown in Figures 4 and 5, since the contact portion of the terminal member 24 with the spacer member 26 has a shape of a bulge in the shape of a semicircular protrusion, the terminal member 24 and the spacer member 26 can be The line contact is reliably performed while absorbing the manufacturing error of the mutual components, so that the terminal member 24 in the terminal member mounting hole 25 can be reliably positioned.

Then, from the state shown in the sub-figure (d) in FIG. 4 and the sub-figure (d) in FIG. 5, the plate 28 is mounted on both ends of the nut body 21a in the axial direction to complete the ball of this embodiment Screw device 10.

As described above, in the ball screw device 10 of the present embodiment, the end member 24, which is a circulating member, is installed in the end member mounting hole 25, and the nut body 21a can be installed by providing the spacer member 26. In addition, the positioning of the terminal member 24 to the terminal member mounting hole 25 can be achieved by inserting the convex portion 24a formed on the terminal member 24 into the concave portion 27c formed at the entrance of the through hole 27a and rotating the terminal member 24. In this way, the ball screw device 10 of the present embodiment can easily perform positioning and fixing of the end member 24, which is the circulating member disposed at the both ends of the nut 21, and therefore can provide a rolling element screw device 10 that reduces manufacturing costs . In addition, since the terminal member mounting hole 25 of this embodiment has a size that allows the terminal member 24 to be installed in the state where the screw shaft 11 and the nut 21 are assembled, it is particularly suitable for use with the screw shaft 11 whose ends are not cut. Rolling body screw device.

Above, although the preferred embodiment of the present invention has been described, The technical scope of the present invention is not limited to the scope described in the above embodiment. Various changes or improvements can be added to the above-mentioned embodiment.

For example, in the above-mentioned embodiment, the spacer member 26 is exemplified as the fixing means, and the spacer member 26 is configured as a key member formed of a metal material and formed in a cubic shape. In addition, the portion of the terminal member 24 that is in contact with the spacer member 26 has a bulge and semi-circular protrusion shape. That is, the spacer member 26 is in line contact with the terminal member 24. However, the scope of the present invention is not limited to the above-mentioned form, and the circulation member and the partition member of the present invention can adopt various forms within the range that exerts the same function and effect as the above-mentioned embodiment. For example, Fig. 6 and Fig. 7 show such a modification.

Among them, FIG. 6 is a perspective view of the appearance of the detailed structure and assembly sequence of the ball screw device of the modification of the present invention, showing the sub-pictures (a), (b), (c), (d) of the figure The state of assembly in order. In addition, FIG. 7 is a front view of the nut viewed from the flange side to illustrate the detailed structure and assembly sequence of the ball screw device of the modification of the present invention, and shows the sub-pictures (a) and (b) of the figure. ), (c), (d) the order of assembly. Furthermore, the sub-pictures (a), (b), (c), and (d) shown in Fig. 6 and Fig. 7 are corresponding pictures respectively. In addition, there are cases where the same or similar members as those described in the above-mentioned embodiment are given the same reference numerals and the description is omitted.

In the ball screw device 100 of the present modification, as shown in the sub-figure (a) in FIG. 6 and the like, a trapezoidal groove 124c having a trapezoidal cross-sectional shape is formed on the terminal member 124 at the contact portion of the spacer member 126. On the other hand, a trapezoidal convex portion 126a that can be fitted into the trapezoidal groove 124c is formed at a position corresponding to the above-mentioned trapezoidal groove 124c on the spacer member 126 which is a fixing means. Therefore, if the terminal member 124 is arranged in the terminal member mounting hole 125 and the spacer member 126 is inserted, the trapezoidal groove 124c of the terminal member 124 The trapezoidal convex portion 126a of the spacer member 126 is in an engaged state, so that the terminal member 124 and the spacer member 126 can be reliably arranged in the terminal member mounting hole 125. Hereinafter, the manufacturing method of the ball screw device 100 of this modification is demonstrated.

In the manufacture of the ball screw device 100 of this modification, when the terminal member 124 is installed in the terminal member mounting hole 125 in the state where the screw shaft 11 and the nut 21 are assembled, as shown in Figure 7 (b) As shown, the end member 124 can be installed in the end member mounting hole 125 with the lip 124b avoiding the screw shaft 11. Then, from the state shown in the sub-figure (b) in FIG. 7, in the terminal member mounting hole 125, the terminal member 124 is turned toward the screw shaft 11 with the center position of the convex portion 124a and the concave portion 27c indicated by the symbol X as the rotation center The side rotation causes the lip 124b to protrude into the ball rolling groove 11a of the screw shaft 11 (refer to the sub-figure (c) in FIG. 7).

According to the state shown in the sub-figure (c) in Fig. 6 and the sub-figure (c) in Fig. 7, insert and set the gap generated between the terminal member mounting hole 125 and the terminal member 124 as The spacer member 126 of the fixing means. At this time, since the trapezoidal groove 124c of the terminal member 124 and the trapezoidal convex portion 126a of the spacer member 126 are in the engaged state, the terminal member 124 and the spacer member 126 can be reliably arranged in the terminal member mounting hole 125, and then the completion Installation of the terminal member 124 to the terminal member mounting hole 125 (refer to the sub-map (d) in FIG. 6 and the sub-map (d) in FIG. 7). Furthermore, in this modified example, although the engaging means formed by the trapezoidal groove 124c and the trapezoidal convex portion 126a is illustrated, the shape of the above-mentioned engaging means is not limited to the trapezoid shape, and any shape of the mortise and tenon may also be used. .

Then, from the state shown in the sub-map (d) in FIG. 6 and the sub-map (d) in FIG. 7, the plate 28 is mounted on both ends of the nut body 21a in the axial direction, thereby completing this modification The ball screw device 100. Due to the above-mentioned terminal components of this modification The mounting hole 125 has a size that allows the end member 124 to be installed when the screw shaft 11 and the nut 21 are assembled. Therefore, it is particularly suitable for rolling element screw devices that use the screw shaft 11 with uncut ends.

Furthermore, in the ball screw device 10 of this embodiment shown in FIGS. 4 and 5, a large notch shape is formed in the terminal member mounting hole 25, and a spacer member 26 is inserted into the position of the notch shape constitute. On the other hand, in the ball screw device 100 of this modification shown in FIGS. 6 and 7, the terminal member mounting hole 125 is not formed with a large notch shape. That is, in the case of the ball screw device 100 of this modification, by adopting the engaging means formed by the tenon hole and the tenon, even when the terminal member mounting hole 125 is formed in a simple shape, it can still be firm The carded state. In addition, since this structure forms the terminal member mounting hole 125 in a simple shape, the amount of processing for the nut body 21a can be reduced, and the effect of reducing manufacturing costs can be obtained.

As mentioned above, in the above-mentioned modification example, the form example of the multiple styles which can be acquired by the circulation member and the fixing means was demonstrated, but it is possible to further adopt the multiple style variant form for the invention. Therefore, other modification examples that can be obtained by the fixing means of the present invention will be described below. For example, FIGS. 8 and 9 show another modification of this type.

Among them, FIG. 8 is a perspective view of the appearance of the detailed structure and assembly sequence of the ball screw device of another modification of the present invention, showing the sub-pictures (a), (b), (c), (d) in the figure. ) The order of assembly. In addition, FIG. 9 is a front view of the nut viewed from the flange side to illustrate the detailed structure and assembly sequence of the ball screw device of another modification of the present invention, and shows the sub-pictures (a), (b), (c), (d) the order of assembly. Furthermore, the sub-pictures (a), (b), (c), and (d) shown in Figs. 8 and 9 are corresponding pictures respectively. In addition, there are It is the same or similar to the members described in the modified examples, and the same reference numerals are assigned, and the description is omitted.

In the ball screw device 200 according to another modification of the present invention, as shown in the sub-figure (a) in FIG. 9 and the like, two screw holes 225a are formed in the end member mounting hole 225 which is the circulating member mounting hole. On the other hand, two bolt mounting holes 224c are formed at positions corresponding to the two screw holes 225a in the end member 224 which is the circulating member. In addition, in the ball screw device 200 of another modification of the present invention, the bolt 226 that can be screwed into the screw hole 225a through the bolt mounting hole 224c formed in the terminal member 224 is used, and the screw holes 225a, The bolt mounting hole 224c and the bolt 226 realize the fixing means of the present invention. Therefore, by arranging the terminal member 224 in the terminal member mounting hole 225 and screwing the bolt 226 to the screw hole 225a through the bolt mounting hole 224c, the terminal member 224 is reliably installed in the terminal member mounting hole 225. Hereinafter, a method of manufacturing the ball screw device 200 according to another modification of the present invention will be described.

When manufacturing the ball screw device 200 of another modification of the present invention, when the terminal member 224 is installed in the terminal member mounting hole 225 in the state where the screw shaft 11 and the nut 21 are assembled, as shown in FIG. 9 As shown in Figure (b), the end member 224 can be installed in the end member mounting hole 225 with the lip 224b avoiding the screw shaft 11. Then, from the state shown in the sub-figure (b) in FIG. 9, in the terminal member mounting hole 225, the terminal member 224 is turned toward the screw shaft 11 with the center position of the convex portion 224a and the concave portion 27c indicated by the symbol X as the rotation center The side rotation causes the lip portion 224b to protrude into the ball rolling groove 11a of the screw shaft 11 (refer to the sub-figure (c) in FIG. 9).

Insert the bolts 226 into the two bolt mounting holes 224c of the terminal member 224 from the state shown in the sub-figure (c) in Fig. 8 and the sub-figure (c) in Fig. 9, so that the bolts 226 are installed through the bolts The hole 224c is screwed to the screw hole 225a. With this kind of snail The bolts are fixed to realize the reliable setting state of the end member 224 in the end member mounting hole 225, and complete the installation of the end member 224 to the end member mounting hole 225 (refer to the sub-diagram (d) in Fig. 8 and the division in Fig. 9 Figure (d)). Furthermore, in another modification of the present invention, although the convex portion 224a and the concave portion 27c are used to position the terminal member 224 in the terminal member mounting hole 225, the convex portion 224a and the concave portion 27c may be omitted.

Then, from the state shown in the sub-figure (d) in FIG. 8 and the sub-figure (d) in FIG. 9, the plate 28 is mounted on both ends of the nut body 21a in the axial direction, thereby completing the present invention A ball screw device 200 of another modification. Since the terminal member mounting hole 225 of another modification of the present invention described above has the size that the terminal member 224 can be installed in the state where the screw shaft 11 and the nut 21 are assembled, it is particularly suitable for applications with uncut grooves at both ends The screw shaft 11 rolling element screw device.

In the above, the various form examples that can be obtained by the present invention have been described using FIGS. 1 to 9. For the present invention, a variety of modified forms based on the above-mentioned various forms can be adopted. For example, in the above-mentioned embodiment and modification examples, the rolling element screw device of the present invention is exemplified as the ball screw device 10, 100, 200 using balls as the rolling elements, but the rolling element of the present invention can also be applied such as Rolling bodies of any form such as rollers and rollers.

In addition, for example, in the above-mentioned embodiment and modification examples, a pair of end members 24 are attached to both ends of the nut body 21a in the axial direction, and the pair of end members 24 serve as a circulation for circulating the rolling elements, namely the balls 13. Component and function. However, the rolling element screw device of the present invention can be provided with two or more circulation members. That is, in the case of increasing the number of ball rolling grooves 11a formed on the screw shaft 11, the circulation member of the present invention is provided with two or more.

In addition, for example, in the above-mentioned embodiment, by using the terminal member The gap space created between 24 and the terminal member mounting hole 25 is provided with a fixing means formed by the spacer member 26, and the position of the terminal member 24 is fixed. However, the fixing means applicable to the present invention are not limited to structural members such as the spacer member 26, and chemical fixing means such as metal adhesives and adhesives can also be used.

It is obvious from the description of the scope of patent application that such changes or improvements are also added to the technical scope of the present invention.

10‧‧‧Ball screw device (rolling body screw device)

11‧‧‧Screw shaft

11a‧‧‧Ball rolling groove (rolling element rolling groove)

21‧‧‧Nut

21a‧‧‧Nut body

21b‧‧‧Flange

21c‧‧‧Mounting hole

24‧‧‧Terminal component (circular component)

24a‧‧‧Protrusion

25‧‧‧End component mounting hole (circulating component mounting hole)

26‧‧‧Partition member (fixing means)

28‧‧‧Plate

Claims (4)

A rolling element screw device comprising: a screw shaft with a spiral rolling element rolling groove on the outer peripheral surface; a nut with a spiral load rolling element opposite to the rolling element rolling groove on the inner peripheral surface Rolling groove; return path connecting one end and the other end of the spiral load rolling element rolling path between the rolling element rolling groove of the screw shaft and the load rolling element rolling groove of the nut; and a plurality of The rolling elements are arranged in the rolling path of the loaded rolling element and the return path, wherein the nut is provided with a nut body in which the rolling groove of the loaded rolling element is formed, and the nut body is respectively mounted on the nut body A plurality of circulating members having at least a part of the return path formed on both end surfaces, the nut system has a circulating member mounting hole larger than the outer shape of the circulating member on both end surfaces of the nut body, and the circulating member is attached to After being installed in the circulation member mounting hole, the circulation member is rotated with the center of the concave portion on the nut side and the convex portion of the circulation member as the center of rotation, and then the nut body is adjusted by fixing means. installation. The rolling element screw device of claim 1, wherein the fixing means is configured as a spacer member, the circulation member is installed to the nut body by providing the spacer member, and the spacer member is attached to the circulation member. The component is arranged after the circulation component mounting hole to fill the gap between the circulation component mounting hole and the circulation component The gap in life. The rolling element screw device of claim 1, wherein the fixing means is formed by a screw hole formed in the circulation member mounting hole, and a bolt that can be screwed into the screw hole through the bolt mounting hole formed in the circulation member constitute. The rolling element screw device according to any one of claims 1 to 3, wherein the circulation member is provided with a lip protruding toward the rolling element rolling groove of the screw shaft for fishing In the rolling element that the load rolling element rolling path rolls toward the return path, the circulating member mounting hole has a size that allows the circulating member to be installed in a state where the screw shaft and the nut are assembled.

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