JPH0611433Y2 - Ball screw tube holding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a ball screw tube pressing device that requires only one type of ball circulation tube for a ball screw, whether it is a single row or a plurality of rows.

[Conventional technology]

In the tube type ball screw, for example, as shown in FIG. 10, a nut 4 having a flange 4a is screwed into a screw shaft 2 having a spiral groove 1 via a steel ball ball 3. The inner surface of the nut 4 is provided with a spiral groove corresponding to the spiral groove 1 of the screw shaft. Then, for example, by rotation of the screw shaft 2, the ball 3 moves while rolling in both spiral grooves, and the nut 4 moves linearly. The movement of the ball 3 is performed by circulating it inside the nut. Therefore, the ball circulation tube 5 is attached to the nut 4. This ball circulation tube 5
Is formed in a substantially U shape. On the other hand, a part of the outer surface of the cylindrical nut 4 is formed into a flat notched flat portion 6, and a pair of two holes 7 communicating with the spiral groove on the inner surface of the nut is opened across the screw shaft 2. There is. Both ends of the ball circulation tube 5 are inserted into the set of holes 7 to form a ball circulation path 8 that goes over the land portion of the spiral groove of the screw shaft 2. The ball 3 advances from point A in the drawing while rolling between the screw shaft 2 and the spiral groove of the nut 4, and makes one and a half to three and a half turns around the spiral groove, and then the tip of the ball circulation tube 5 at the point B. It is scooped up, passes through the tube, and returns to point A. The circulation is repeated.

In the illustrated case, two ball circulation tubes 5 are obliquely provided in parallel, but the number of ball circulation tubes 5 may be one, or may be three or four.

In any case, the ball circulation tube 5 is fitted and fixed in the tube fitting groove 12 of the tube pressing device 10 which is attached to the flat surface portion 6 of the nut 4 with the screw 11. As the tube pressing device 10, in addition to a block product machined from a block material as shown in FIGS. 10 and 11, a press product obtained by press molding a plate material as shown in FIG. 12 is also used. .

[Problems to be solved by the device]

However, in the above-mentioned conventional tube pressing device, the one having the tube fitting concave grooves 12 corresponding to the number of the ball circulation tubes 5 in advance has been used. Therefore, various types of tube pressing devices are required according to the difference in the number of ball circulation tubes 5, which not only takes time for production, but also delivery time and inventory management are troublesome and error-prone. There is a problem that when the tubes are cut, it is not possible to accommodate the tubes having different numbers of tube fitting concave grooves by filling them.

Therefore, the present invention has been made by paying attention to the above-mentioned conventional problems, and the purpose thereof is that only one type is sufficient for the difference in the number of ball circulation tubes having the same tube diameter and the same inclination angle. An object of the present invention is to provide a ball screw tube pressing device to solve the above-mentioned conventional problems.

[Means for Solving the Problems]

In order to achieve the above object, the present invention is a ball screw tube pressing device for fixing a ball circulating tube exposed on an outer surface of a nut of a tube type ball screw, the device being tilted according to an inclination angle of the ball circulating tube. The tube fitting concave groove and the sleeve portion extending to both side edges of the concave groove are provided, and the lower surface of one of the sleeve portions is a surface that comes into contact with the mounting surface of the nut and the other sleeve portion has The lower surface has a step corresponding to the thickness of the one sleeve portion.

It is also possible to insert the one sleeve portion of another tube holding device into the step and connect a plurality of tube holding devices in parallel.

The tube pressing device can be formed by press molding.

Further, the tube pressing device may be formed by cutting out a block material.

[Action]

By utilizing the step provided on the lower surface of the sleeve formed on both side edges of the tube fitting groove, one sleeve of one tube holding device and the other sleeve of another tube holding device are overlapped with each other. With this, it is possible to mount a plurality of tube holding devices in combination in parallel. Therefore, if the tube diameters are the same and the ball circulation tubes have the same inclination angle, only one type of tube holding device is needed, which is not only easy to manufacture but also easy to manage and manage the delivery date and inventory. It is possible to apply to various types of tube type ball screw nuts with different numbers of ball circulation tubes as long as the number is large.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIGS. 1 and 2 show a first embodiment of the present invention, which is a tube pressing device 19 for a press-formed sheet metal product. A substantially U-shaped tube fitting groove (hereinafter, simply referred to as groove) 20 into which the ball circulation tube is fitted is formed with a predetermined inclination angle α. Plate-shaped sleeves 2 are provided on both side edges of the groove 20.
1, 22 are provided. The lower surface of the sleeve portion 21 is a surface that comes into contact with the mounting surface 23 of the ball screw nut 4 on the flat surface portion 6. On the other hand, the mounting surface 24, which is the lower surface of the sleeve portion 22 on the opposite side, has a step 2 with respect to the lower surface 23 of the sleeve portion 21.
5 are provided. The dimension t of the step 25 is equal to the sleeve 2
This corresponds to a plate thickness t of 1. Both sleeves 21 and 2
A mounting screw hole 26 is formed in the mounting member 2. Furthermore, a notch 27 cut off diagonally at the corners of the sleeves 21 and 22.
Is provided.

FIG. 3 shows a mode of use in which one row of ball circulating tubes 5 is fixed by using only one tube pressing device 19 described above. In this case, the step 2 of the sleeve 22
A flat washer 28 having a plate thickness t is applied to the plate 5 and attached to the nut 4.

FIG. 4 and FIG. 5 show a mode of use when fixing a plurality of rows (three rows in the figure) of ball circulation tubes 5 arranged at an inclination angle α. In this case, the sleeve portion 21 of another tube holding device 19 is inserted into the step 25 of the sleeve portion 22 of one tube holding device 19. By using the step 25 provided in the sleeve portion 22 in this way, by stacking the other mounting surface 24 on the one mounting surface 23, a plurality of tube holding devices 19 can be combined in parallel. Can be installed. A flat washer 28 having a plate thickness t is provided on the step 25 of the sleeve portion 22 of the last tube pressing device 19.
Guess As described above, the tube holding devices 19 arranged in parallel are attached to the nut 4 of the ball screw with the screws 29 inserted into the respective mounting screw holes 26, and the ball circulation tube 5 is fitted into the groove 20 and fixed. It becomes like the figure.
When connected in this manner, the notches 27 at the corners prevent the adjacent tube pressing devices 19 from interfering with each other.

FIGS. 6 to 9 show a second embodiment of the present invention and show a tube holding device 31 for a block product which is machined from a block material. In this case, a groove 20 having an inclination angle α is cut in a block material having a parallelogram plane and a thickness T, and a plate-shaped sleeve portion 21 having a thickness t is formed on one side edge of the groove 20. It is cut and formed. On the other hand, the groove 20
The side edge on the opposite side of the sleeve 3 is cut into a flat shape by a thickness t.
2 is formed. This allows the ball screw nut 4
On the lower surface of the sleeve portion 21 which is the mounting surface 23 to the flat surface portion 6, the mounting surface 33 which is the lower surface of the sleeve portion 32 on the opposite side has a step 25 having a thickness t. A mounting screw hole 26 is formed in each of the sleeve portions 21 and 32. Both sleeves 2
Notches 34 are provided by cutting off sharp corners of 1, 32. FIG. 8 and FIG. 9 show a mode of use when fixing multiple rows (two rows in the figure) of ball circulation tubes. In this case, the sleeve portion 21 of the other tube holding device 32 is inserted into the step 25 of the sleeve portion 32 of the one tube holding device 31. Thus, like the first embodiment,
By utilizing the step 25 provided on the sleeve portion 32 and stacking the other mounting surface 33 on the one mounting surface 23, it is possible to mount a plurality of tube holding devices in parallel in combination. Last tube holding device 1
A flat washer 28 having a plate thickness t is applied to the step 25 of the sleeve 22 of No. 9.

In each of the above embodiments, the tube pressing devices 19, 3
Although the notches 27 and 34 are provided at the corners of No. 1 to prevent mutual interference during connection and use, depending on the arrangement pitch of the ball circulation tubes 5, the notches 27 and 34 need not necessarily be provided. Absent. In addition, for example, when the nut 4 does not have the flange 4a, the notches 27, 34 are formed at the corners.
Instead of providing the above, it is also possible to form the plane as shown by the chain line in FIGS. 1 and 6 to be a parallelogram.

[Effect of device]

As described above, according to the present invention, one tube fitting concave groove that is inclined according to the inclination angle of the ball circulation tube of the tube type ball screw is formed, and the sleeve portions for attachment are formed on both side edges thereof. And the lower surface of one of the sleeves is a surface that comes into contact with the mounting surface of the ball screw nut, and the lower surface of the other sleeve has a step corresponding to the thickness of the one sleeve. . Therefore, it is possible to insert any one of the plurality of tube pressing devices in parallel by inserting one sleeve portion of the other tube pressing device into the step, and the same inclination angle of the ball circulation tube, and If the tube diameter is the same, only one kind of tube holding device is needed, and not only is it easy to manufacture, but delivery time and inventory management are also easy and there is no error.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention, FIG. 2 is a front view, FIG. 3 is a perspective view when used alone, and FIG. 4 is a perspective view when three pieces are connected in parallel. FIG. 5 is a plan view in which three rows of ball circulation tubes are fixed, FIG. 6 is a plan view of a second embodiment of the present invention, FIG. 7 is a front view, and FIG. 8 is a parallel connection of two. FIG. 9 is a plan view of the same, FIG. 9 is a front view of the same, FIG. 10 is a perspective view showing a notched part of a ball screw to which a conventional tube pressing device is attached, and FIGS. 11 and 12 are conventional tube pressing devices, respectively. FIG. In the figure, 2 is a screw shaft, 4 is a nut, 5 is a ball circulation tube, 10, 19 and 31 are tube holding devices, 20 is a tube fitting concave groove, 21 is (one) sleeve part, and 22 and 32 are ( The other) sleeve.

Claims (4)

[Scope of utility model registration request] 1. A tube holding device for a ball screw for fixing a ball circulating tube exposed to an outer surface of a nut of a tube type ball screw, wherein the tube fitting recess is inclined according to an inclination angle of the ball circulating tube. A groove and sleeve portions extending from both side edges of the concave groove are provided. A lower surface of one sleeve portion is a surface that abuts a mounting surface of the nut, and a lower surface of the other sleeve portion is the one sleeve. A tube pressing device for a ball screw, characterized in that it is formed with a step corresponding to the thickness of the portion. 2. The tube holding device of the other tube holding device is inserted into the step so that a plurality of tube holding devices can be connected in parallel. Tube holding device for the described ball screw. 3. The ball screw tube pressing device according to claim 1, wherein the tube pressing device is press-molded. 4. The ball screw tube pressing device according to claim 1, wherein the tube pressing device is formed by cutting a block material.