JPH04107551U - Ball screw top fixing structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the piece fitted into the long hole of the ball nut from falling out. [Configuration] Piece 8 fitted into long hole 4 of ball nut 5
is fixed by an adhesive 9 filled in the elongated hole 4. A locking groove 13 is formed on the side wall surface of the elongated hole 4, and the adhesive 9
also flows into this locking groove 13 and solidifies. Therefore, since the solidified adhesive layer engages with the locking groove 13, the piece 8 is firmly held within the elongated hole 4.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a ball screw. This relates to a structure that prevents the pieces from coming off, which are fitted to form a circulation path for the ball. be.

0002

[Conventional technology]

The conventional structure of the ball screw (10) will be explained below based on FIGS. 6 to 11. . The ball screw (10) has a screw shaft (10) formed with a first spiral groove (1) on its outer peripheral surface. 3), a second spiral groove (2) is formed on the inner peripheral surface, and a second spiral groove (2) is formed on the inner peripheral surface. ) is cut out with an oval long hole (4) extending from the outer surface to the inner surface. The ball nut (5) fits into the long hole (4) of the ball nut (5). , by connecting the second spiral groove (2) cut by the elongated hole (4). A piece formed by forming a circulation path (7) for a ball (6) on the inner peripheral surface of a ring nut (5). (8) and is fitted between the circulation path (7) and the first spiral groove (1) so as to be able to roll and circulate. After fitting a large number of balls (6) and the top (8) into the long hole (4), Adhesive applied to the long hole (4) of the ball nut (5) and hardened to prevent it from coming off. It is composed of a layer (9).

0003 As shown in Figure 6 and Figures 8 and 9, the piece (8) is inserted into the long hole (4). In order to position the nut (5) in the radial direction, there is a step (11) in the middle in the depth direction. The inner side of the stepped portion (11) is the longer diameter dimension L1 of the piece (8). The diameter is relatively small. On the other hand, the outside from the stepped portion (11) is The diameter is relatively large in accordance with the long-diameter dimension L2 of the head (12) of the head (8). . In a conventional ball screw, the piece (8) is inserted into the elongated hole (4), and the head (1) is inserted into the long hole (4). 2) By bringing the bottom surface into contact with the stepped part (11), the piece (8) is attached to the ball nut. After positioning the piece (5), apply adhesive (9) into the long hole (4) from above the piece (8). The piece (8) is fixed by filling the adhesive (9) and solidifying the adhesive (9).

0004

[Problem that the idea aims to solve]

In conventional ball screws, the fixing strength of the piece (8) is determined by the side wall surface of the mounting hole (4). Since it depends only on the adhesive force that acts between the There was a problem that strength could not be obtained.

[0005] Therefore, the purpose of this invention is to improve the fixing strength of the top and prevent the top from falling off. There are many things.

[0006]

[Means to solve the problem]

As a solution to the above problem, the present invention forms a first spiral groove on the outer peripheral surface in the longitudinal direction. A screw shaft formed by A part of the second spiral groove is formed on the surface by an elongated hole extending from the outer surface toward the inner surface. A ball nut with a notch structure and a ball nut that fits into the long hole of the ball nut. , connect the cut out second spiral groove to form a circulation path on the inner peripheral surface of the ball nut. a circulation path formed on the inner surface of the ball nut, and the first spiral groove. A large number of balls are fitted in such a way that they can roll and circulate between A ball made of adhesive filled in the long hole is used as a material to prevent the pieces from falling out. At the same time, a locking groove was formed on the side wall surface of the part of the elongated hole to be filled with adhesive. The present invention provides a ball screw top fixing structure characterized by the following.

[0007]

[Effect]

After fitting the piece into the long hole, inject adhesive from the top of the long hole and apply it to the side wall of the long hole. By solidifying the adhesive within the formed locking groove, this adhesive layer is given a predetermined A locking force can be applied.

[0008]

【Example】

Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 5. In addition, the following description In principle, the same components as in FIGS. 6 to 11 showing the prior art are the same references. They will be indicated by reference numbers, and explanations of duplicate items will be omitted.

[0009] As shown in FIGS. 1, 3 and 5, the top (8) has an oblong plane as a whole. It has a rectangular cross section. From the outer circumferential surface of the ball nut (5) to the inner circumference As shown in Figures 1 and 3, the long hole (4) drilled toward the plane It has the same oval shape as the top (8). The side wall surface of the elongated hole (4) is marked with As shown in FIG. A stop groove (13) is formed. This locking groove (13) is connected to the adhesive ( 9), and its shape is tapered as shown in Figure 2, or Any square shape as shown in 4 may be used.

0010 When assembling the ball screw (10), fit the piece (8) into the long hole (4). After soldering, adhesive (9) is injected into the long hole (4). The injected adhesive (9) is Since it also flows into the locking groove (13) and solidifies, this adhesive layer (9) and the elongated hole (4) A locking force is applied between them, and the force to prevent the top (8) from coming off is improved.

[0011]

[Effect of the idea]

The adhesive layer is firmly held within the long hole by the locking groove formed on the side wall of the long hole. This reliably prevents frames from falling off, which has been a problem in the past.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a first embodiment of a long hole and a piece.

FIG. 2 is a cross-sectional view of a long hole and a locking groove taken along line YY in FIG. 1;

FIG. 3 is a plan view showing a second embodiment of the elongated hole and the piece.

4 is a cross-sectional view of a long hole and a locking groove taken along line Y-Y in FIG. 3;

FIG. 5 is a cross-sectional view of the ball nut, illustrating how adhesive is filled into the elongated hole and the locking groove.

FIG. 6 is a longitudinal sectional view showing a conventional example of a ball screw.

7 is a cross-sectional view of the ball screw shown in FIG. 6. FIG.

FIG. 8 is a perspective view of the top.

FIG. 9 is a plan view illustrating a state in which a piece is fitted into a long hole.

FIG. 10 is a longitudinal cross-sectional view of a long hole and a piece along line XX.

FIG. 11 is a cross-sectional view of the long hole and the piece along line Y-Y.

[Explanation of symbols]

4 long hole 5 ball nut 6 balls 7 Circulation path 8 frames 9 Adhesive 10 Ball screw 13 Adhesive locking groove

Claims (1)

[Scope of utility model registration request] Claim 1: A screw shaft having a first spiral groove formed on the outer peripheral surface, a second spiral groove opposing the first spiral groove formed on the inner peripheral surface, and the second spiral groove formed in the inner peripheral surface. A ball nut having a notch structure in which a part of the ball nut is cut out by an elongated hole extending from the outer surface toward the inner surface, and a ball nut that fits into the elongated hole of the ball nut and connects the cut out second helical groove. a piece forming a circulation path on the inner peripheral surface of the ball nut; a large number of balls fitted so as to be able to roll and circulate between the circulation path formed on the inner surface of the ball nut and the first spiral groove; In a ball screw consisting of an adhesive filled in the elongated hole to prevent the piece fitted into the ball nut from coming off, a locking groove is provided on the side wall surface of the portion of the elongated hole where the adhesive is filled. A ball screw top fixing structure characterized by the following: