JPH0522914U - Ball screw top fixing structure - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the top inserted into the long hole of the ball nut from falling off. [Structure] The elongated hole 4 bored from the outer peripheral surface of the ball nut 5 toward the inner peripheral surface has an oval shape in plan view which is the same as the top 8. On the side wall surface of the long hole 4, a locking groove 13 is formed with a predetermined width dimension w along the longitudinal direction thereof.
Further, a deformable protrusion 16 is provided on the peripheral portion 8A in the longitudinal direction of the top 8. The top 8 inserted into the long hole 4
Is fixed by crimping the projection 16 to the locking groove 13. After that, the adhesive 9 is filled in the long holes 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball screw, and more particularly to a top retaining structure for a top fitted in a long hole of a ball nut to form a ball circulation path.

[0002]

[Prior Art]

 Hereinafter, a conventional structure of the ball screw (10) will be described with reference to FIGS. 6 to 11. The ball screw (10) has a screw shaft (3) formed by forming a spiral groove (1) on the outer peripheral surface, a spiral groove (2) formed on the inner peripheral surface, and a part of the spiral groove (2). Is fitted into the ball nut (5) and the ball nut (5), which are notched by the oval slot (4) extending from the outer surface to the inner surface. The spiral groove (2) notched by the above is connected to the top (8) which forms the circulation path (7) of the ball (6) on the inner peripheral surface of the ball nut (5), and the above circulation. After fitting a large number of balls (6) fitted in the slot (7) and the spiral groove (1) so that they can roll and circulate, and the above-mentioned top (8) into the slot (4), As the retaining material, it is composed of an adhesive layer (9) which is coated and solidified on the long hole (4) of the ball nut (5).

As shown in FIGS. 6 and 8 to 9, the slot (4) is positioned in the middle of the depth direction in order to position the top (8) in the radial direction of the ball nut (5). (11) is provided, and the inside from the step (11) has a relatively small diameter in accordance with the dimension L1 of the top (8) in the major axis direction. On the other hand, the outside of the stepped portion (11) has a relatively large diameter according to the dimension L2 of the head (12) of the comma (8) in the major axis direction. In the conventional ball screw, the top (8) is fitted into the elongated hole (4) and the lower surface of the head (12) is brought into contact with the stepped portion (11) to move the top (8) into the ball nut (8). After positioning at 5), the adhesive (9) is filled into the long hole (4) from above the top (8), and the top (8) is fixed by solidification of the adhesive (9).

[0004]

[Problems to be solved by the device]

 In the conventional ball screw, since the fixing strength of the top (8) depends only on the adhesive force acting between the side wall surface of the elongated hole (4) and the adhesive (9), the fixing strength is practically sufficient. There was a problem that I could not get a degree.

Therefore, an object of the present invention is to improve the fixing strength of the top and prevent the top from falling off.

[0006]

[Means for Solving the Problems]

 A screw shaft formed by forming a spiral groove on the outer peripheral surface and a spiral groove facing the spiral groove are formed on the inner peripheral surface, and a part of the spiral groove is cut out by an elongated hole extending from the outer surface toward the inner surface. The ball nut and the inner surface of the ball nut that fits in the long hole of the ball nut and connects the notched spiral groove to form a ball circulation path on the inner peripheral surface of the ball nut. In a ball screw device consisting of a large number of balls fitted in a ball-circulating path formed in the above and a screw groove of the screw shaft so as to be able to roll and circulate, In addition to forming a locking groove at a position aligned with the upper surface of the top, a deformable protrusion is formed on the peripheral edge of the top surface of the top, and the protrusion is deformed to engage with the locking groove. Providing a ball screw top fixing structure A.

In addition, a locking member is formed on the side wall surface of the elongated hole at a position aligned with the upper surface of the top, and a fixing member having a deformable protrusion formed on the peripheral edge thereof is mounted on the upper surface of the top. The present invention provides a ball screw top fixing structure, characterized in that the projection is deformed to engage with the locking groove.

[0008]

[Action]

 After fitting the top into the long hole of the ball nut, the projection is caulked and fixed in the locking groove, thereby applying a predetermined locking force to the top.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the following description, the same components as those shown in FIGS. 6 to 11 showing the prior art are indicated by the same reference numbers in principle, and the description of the overlapping matters will be omitted.

As shown in FIGS. 1, 2, and 3, a top (8) having a groove (7) formed on the lower surface has an oval planar shape as a whole, and its cross section has a rectangular shape. Eggplant As shown in FIG. 1, the elongated hole (4) bored from the outer peripheral surface of the ball nut (5) toward the inner peripheral surface has the same oval shape as the top (8) in plan view. .. On the side wall surface of the long hole (4), a locking groove (13) is formed with a predetermined width W along the longitudinal direction. Further, a deformable protrusion (16) is provided on the upper peripheral edge (8A) of the top surface of the top (8). It is desirable that the protrusions (16) should not be quenched.

When assembling the ball screw (10), after the top (8) is fitted in the elongated hole (4), the protrusion (16) is deformed by an appropriate tool or the like, and the locking groove (13) is formed. ) Fasten in place. Then, the adhesive (9) is filled into the slot (4) from above the top (8).

FIGS. 4 and 5 show an embodiment in which a fixing member (14) having a protrusion (16) is mounted on the upper surface of the top (8). The fixing member (14) is formed by, for example, press working, and after being mounted on the upper surface of the top (8), the protrusion (16) is inserted into the locking groove (13) in the same manner as described above. Fixed by caulking.

[0013]

[Effect of the device]

 According to the present invention, the protrusion formed on the top or the protrusion formed on the fixing member is fixed to the locking groove of the slot by crimping, so that the strength of fixing the top to the slot is increased and the top does not fall out. Certainly prevented.

[Brief description of drawings]

FIG. 1 is a plan view of a long hole and a top.

2 is a cross-sectional view of a slot and a locking groove taken along the line YY of FIG.

FIG. 3 is a transverse sectional view showing a press-fitted state of a protrusion.

FIG. 4 is a plan view of an elongated hole, a top and a fixing member.

FIG. 5 is a cross-sectional view showing a press-fitted state of a protrusion.

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

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

FIG. 8 is a perspective view of a top.

FIG. 9 is a plan view illustrating a state where the top is fitted into the long hole.

FIG. 10 is a vertical cross-sectional view of the long hole and the top along the line XX.

FIG. 11 is a cross-sectional view of the slot and the top along the line YY.

[Explanation of symbols]

 4 Long hole 5 Ball nut 6 Ball 7 Circulation path 8 Comb 9 Adhesive 10 Ball screw 13 Locking groove 16 Protrusion

Claims (2)

[Scope of utility model registration request] 1. A screw shaft formed by forming a spiral groove on an outer peripheral surface and a spiral groove facing the spiral groove are formed on an inner peripheral surface, and a part of the spiral groove extends from the outer surface toward the inner surface. A ball nut having a notch structure by a hole, a piece fitted into the elongated hole of the ball nut, and connecting the notched spiral groove to form a ball circulation path on the inner peripheral surface of the ball nut; In a ball screw consisting of a plurality of balls fitted so as to be rotatably circulated between a ball circulation path formed on the inner surface of the ball nut and a spiral groove of the screw shaft, the side wall surface of the elongated hole is A locking groove is formed at a position aligned with the top surface of the top, and a deformable protrusion is formed on the peripheral edge of the top surface of the top so that the protrusion is deformed to engage with the locking groove. Ball screw top fixing structure characterized by. 2. A screw shaft having a spiral groove formed on the outer peripheral surface and a spiral groove facing the spiral groove are formed on the inner peripheral surface, and a part of the spiral groove extends from the outer surface toward the inner surface. A ball nut having a notch structure by a hole, a piece fitted into the elongated hole of the ball nut, and connecting the notched spiral groove to form a ball circulation path on the inner peripheral surface of the ball nut; In a ball screw consisting of a plurality of balls fitted in a ball circulation path formed on the inner surface of the ball nut and the spiral groove of the screw shaft so as to be able to roll and circulate, a side wall surface of the elongated hole is formed. A locking member is formed at a position aligned with the top surface of the top, and a fixing member having a deformable projection formed on the peripheral edge thereof is mounted on the top surface of the top and the projection is deformed to engage the locking groove. A ball characterized by being adapted to engage with The same frame fixed structure.