JPH0416662B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for attaching a ball screw consisting of a ball screw shaft and a nut member while accurately centering the ball screw, for example, in a position where the ball screw is used as a feed screw. This invention relates to a centering and mounting method for ball screws that can be used in cutting tables and precision measuring machines.

[Background technology]

FIG. 2 shows a device using a ball screw, and this device is a positioning table for transporting a workpiece attached to a table 1 to an accurate position for processing, for example. The rotation of the motor 2 is transmitted to the ball screw shaft 4 via the coupling ring 3, and the table 1 is moved by a nut member 5 screwed onto the outer periphery of the ball screw shaft 4. Both ends of the ball screw shaft 4 are connected to the first and second bearings via the first and second bearings 6 and 7.
It is supported by support members 8 and 9.

In the above, the table 1 is guided by the guide member 10 to move forward and backward, and the table 1 is positioned by the guide member 10 in the vertical direction and the horizontal direction (front and back directions of the paper in FIG. 2; the same applies hereinafter).
Further, the nut member 5 is in precise contact with the ball screw shaft 4 via the ball 5A. For this reason, the parallel accuracy of the guide member 10 and the ball screw shaft 4 in the vertical and horizontal directions, the mounting height of the nut member 5 in the hanging portion 1A of the table 1, and the support members 8, 9
The support height of both ends of the ball screw shaft 4 must be highly accurate.

[Problem to be solved by the invention]

In order to ensure such centering accuracy of the ball screw, conventionally, holes 11 for attaching the nut member 5 to the hanging portion 1A, and holes 12 and 13 for attaching the bearings 6 and 7 to the support members 8 and 9 are provided. It is required to process with a high degree of precision,
According to this, manufacturing of parts such as the supporting members 8 and 9 becomes troublesome, and a lot of effort and time are required for manufacturing the parts.

The purpose of the present invention is to provide a ball screw that eliminates the need for high-precision machining of parts such as support members, which simplifies the manufacture of parts, and which allows ball screws to be mounted accurately with a high degree of precision. It provides a centering installation method.

[Means for solving problems]

The ball screw centering and mounting method according to the present invention includes:
A nut member screwed onto a ball and the outer periphery of a screw shaft is disposed on a movable body that moves while being guided by a guide member so as to be displaceable in a direction perpendicular to the axial direction of the ball screw shaft. A first bearing rotatably fitted to the end portion is held by a bearing housing, and this bearing housing is supported by a first support member so as to be movable in a direction perpendicular to the axial direction of the ball screw shaft. A second bearing fitted to the other end of the second bearing is non-displaceably supported by a second support member, and after the nut member is brought close to the second support member, the nut member is non-displaceably coupled to the movable body. Then, the nut member is brought close to the first support member, and then the bearing housing is non-displaceably coupled to the first support member.

[Effect]

When the nut member approaches the second support member, the position of the nut member automatically matches the position of the second bearing by displacing the nut member in a direction perpendicular to the axial direction of the ball screw shaft. When approaching the first support member, the position of the first bearing automatically matches the position of the nut member and the second bearing by displacing the bearing housing in a direction perpendicular to the axial direction of the ball screw shaft. This allows centering of the ball screw.

〔Example〕

This embodiment is shown in FIG. In the following description, the same reference numerals are used for the same members as those already described.

The mounting method according to this embodiment is applied to a positioning table in which the table 1 is moved by the rotation of the ball screw shaft 4, similar to that shown in FIG. table 1
A hole 14 into which the main body shaft portion 5B of the nut member 5 is inserted is formed through the hanging portion 1A of the nut member 5.
has a larger diameter than the main body shaft portion 5B. Further, the flange portion 5C of the nut member 5 has a hole 1 into which a bolt 15 for connecting the nut member 5 to the hanging portion 1A is inserted.
6 is provided, but this hole 16 also has a larger diameter than the bolt 15.

One end 4A of the ball screw shaft 4 is connected to the first bearing 1
7. First support member 1 via bearing housing 18
Supported by 9. The bearing 17 is connected to the bearing housing 18
The bearing 17 is fitted into the hole 20 of the bearing housing 18, thereby holding the bearing 17 in the bearing housing 18.
8 is coupled to the support member 19 with bolts 21. The hole 22 of the support member 19 into which the bolt 21 is inserted has a larger diameter than the bolt 21.

The other end 4B of the ball screw shaft 4 is connected to the second bearing 2
3 and is supported by the second support member 24. The bearing 23 is assembled to the support member 24 in the same manner as the bearing 7 in the conventional support member 9 shown in FIG.
The bearing 23 is fitted into a hole 25 formed in the support member 24 in a direction perpendicular to the axial direction of the ball screw shaft 4 such that it cannot be displaced.

Next, the installation and assembly work of the above ball screw will be described.

Lightly tighten the bolts 15 and 21. As a result, the nut member 5 whose main body shaft portion 5B is loosely engaged with the hole 14 is moved in the direction perpendicular to the axial direction of the ball screw shaft 4 with respect to the hanging portion 1A of the table 1, that is, in the vertical and horizontal directions (as shown in the paper in FIG. The bearing housing 18 with the bolt 21 loosely fitted into the hole 22 is also movable relative to the first support member 19 in the direction perpendicular to the axial direction of the ball screw shaft 4. Ru. Thereafter, the end portion 4A of the ball screw shaft 4 is floatingly supported with a jig or the like, and the ball screw shaft 4 is manually rotated to move the nut member 5 and the table 1 to the right in FIG. The member 5 is moved closer to the second support member 24. As a result, the nut member 5 is displaced vertically and horizontally with respect to the hanging portion 1A, and the position of the nut member 5 automatically matches the position of the second bearing 23 at the end portion 4B of the ball screw shaft 4. Then bolt 1
5, the nut member 5 is immovably connected to the hanging portion 1A at that position.

As described above, the nut member 5 is displaced with respect to the hanging portion 1A, and the position of the nut member 5 becomes the same position as the second bearing 23. Therefore, unlike the conventional example, the hole 25 into which the bearing 23 is fitted is accurately positioned in the support member 24. This eliminates the need for high-precision machining at specific locations. Furthermore, since the hole 14 in the hanging portion 1A of the table 1 is for loosely engaging the main body shaft portion 5B of the nut member 5, this hole 14 also does not need to be machined with high precision.

Next, the ball screw shaft 4 is rotated in the opposite direction to that described above to move the nut member 5 and the table 1 to the left in FIG.
Bring it closer to 9. During this work process, the table 1 moves while being positioned vertically and horizontally by the guide member 10, so the bearing housing 18 is displaced vertically and horizontally with respect to the support member 19, which causes the ball screw shaft 4 to move. is parallel to the guide member 10 in the vertical and horizontal directions, and the position of the first bearing 17 in the bearing housing 18 automatically matches the positions of the nut member 5 and the second bearing 23. Thereafter, by tightening the bolts 21, the bearing housing 18 is irreplaceably connected to the support member 19 at that position.

At this time, the mounting height of the nut member 5 on the hanging portion 1A of the table 1 and the supporting height of both ends 4A, 4B of the ball screw shaft 4 on the support members 19, 24 are exactly the same, and the ball screw shaft 4 and Accurate parallelism with the guide member 10 in the vertical and horizontal directions is achieved, and when the ball screw shaft 4 and the coupling ring 3 are connected and the motor 2 is rotated, the table 1 moves smoothly.

Although the above embodiments were applied to a ball screw for a positioning table, the present invention can also be applied to a ball screw for a precision measuring machine, for example, and if necessary, a ball screw whose both ends are supported by support members. The present invention can be applied to any device or machine as long as a nut member is screwed onto the outer periphery of the shaft and a moving body is guided by a guide member and moved by rotation of the ball screw shaft.

〔Effect of the invention〕

According to the present invention, it is no longer necessary to process parts such as support members with high precision, making it easy to manufacture parts, and yet it is possible to center the ball screw with high precision and install it accurately. become able to.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention, Fig. 2
The figure is similar to FIG. 1 showing a conventional example. 4... Ball screw shaft, 4A, 4B... End of ball screw shaft, 5... Nut member, 10... Guide member, 15, 21... Bolt, 17, 23... First, second bearing, 18...Bearing housing, 19,
24...First and second support members.

Claims (1)

[Claims] 1. A nut member screwed onto the outer periphery of a ball screw shaft is disposed on a moving body that moves while being guided by a guide member so as to be displaceable in a direction perpendicular to the axial direction of the ball screw shaft, and A first bearing rotatably fitted to the end portion is held by a bearing housing, and this bearing housing is supported by a first support member so as to be movable in a direction perpendicular to the axial direction of the ball screw shaft. A second bearing fitted to the other end of the second bearing is non-displaceably supported by a second support member, and after the nut member is brought close to the second support member, the nut member is non-displaceably coupled to the movable body. 1. A method for centering and mounting a ball screw, comprising: then bringing the nut member closer to a first support member; and then non-displaceably coupling the bearing housing to the first support member.