JPH0814239A - Turning stopper for nut - Google Patents

Abstract

PURPOSE:To ensure the turning stop of a nut by inserting a lock pin energized so as to project in an inner peripheral direction by a spring material into an inserting hole penetrating in the diameter direction of the nut and forming a slant surface on which the getting over of the lock pin is allowed only in the tightening direction of the nut, on the bottom part of plural lock grooves arranged on the outer peripheral surface of a bolt. CONSTITUTION:The gear arm 10 of a steering device is tightened to the ball stud 11 of a drag link by a nut 12. A nearly C shaped spring material 13 is provided for the turning stop of the nut 12 and lock pins 14 facing each other inward coaxially is formed on its both ends. A ring shape wall 15 for surrounding the screw hole of the nut is provided on the upper surface of the nut 12 and inserting holes 16 are formed and the lock pins 14 are allowed to penetrate the holes. Plural lock grooves 17 are arranged on the tip part of the ball stud 11 at equal intervals and the engagingly locking surface 17a of the lock pins 14 is provided in a groove 17 in the loosening direction of the nut 12 and a slant surface 17b, on which the getting over of the lock pin 14 is allowed only in the tightening direction of the nut 12, is provided on the bottom part of the groove 17. Thus, the turning stop of the nut is carried out easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut rotation preventing device.

[0002]

2. Description of the Related Art An example of using a split pin as shown in FIG. 6 is often seen as a nut rotation preventing device. In this case, in the vehicle steering system, the nut 1 fastens the gear arm 4 to the ball stud 3 of the drag link 2. A plurality of radially extending lock grooves 5 are radially formed on the upper surface of the nut 1, and a radial insertion hole 6 is provided at the tip of the ball stud 3. Then, in a state where the lock groove 5 is communicated with the insertion hole 6 when the nut 1 is tightened, the split pin 7 is inserted into one of these from one side, and the distal end side is bent so as to be opened to prevent the split pin 7 from coming off.

[0003]

However, in such a conventional example, when inserting the split pin 7, it is necessary to make the insertion hole 6 and the lock groove 5 coincide with each other while turning the nut 1 in the tightening direction. In addition, since the work of bending the tip end side of the pin is added to prevent the inserted split pin 7 from coming off, there is a problem that the rotation stop of the nut 1 cannot be efficiently processed.

The present invention aims to solve such problems.

[0005]

According to a first aspect of the present invention, in a rotation preventing device for a nut tightened to a bolt, an insertion hole penetrating the nut in a radial direction, and a lock pin inserted freely into and out of the insertion hole. , Equipped with a spring member for urging the lock pin to project to the inner circumference of the nut, and disposing a plurality of lock grooves for locking the lock pin when tightening the nut on the same circumference of the bolt outer peripheral surface. An inclined surface is formed at the bottom of the groove to allow the lock pin to be climbed over only in the nut tightening direction.

According to a second aspect of the present invention, a nut rotation preventing device for tightening a bolt is provided with a substantially C-shaped spring member which is assembled so as to straddle the upper surface of the nut in the radial direction, and the intermediate spring member when tightening the nut. A plurality of locking grooves extending in the radial direction are radially arranged on the tip end surface of the bolt that abuts against the portion, and an inclined surface that allows the spring material to pass over only in the tightening direction of the nut is formed at the bottom of these grooves.

According to a third aspect of the present invention, in a nut detent device for tightening a bolt, a lock cover is provided to cover the nut from the upper surface to the side surface. The spline portion is formed and the fitting hole is provided in the lock cover.

According to the fourth invention, a gap is provided between the side surface of the lock cover and the side surface of the nut in the third invention for adjusting the mounting angle of the lock cover to the tip of the bolt.

[0009]

According to the first aspect of the present invention, the lock pin is assembled with the spring member when tightening the nut, so that when the nut rotates in the tightening direction, the lock pin resists the urging force of the spring member and moves the lock groove. Although it gets over, the lock groove locks the lock pin against the rotation of the nut in the loosening direction, so that it is possible to easily and appropriately prevent the nut from rotating.

According to the second invention, by assembling the C-shaped spring material at the time of tightening the nut, when the nut rotates in the tightening direction, the spring material has the tip of the bolt at the intermediate portion straddling the screw hole. Although it goes over the lock groove while contacting the surface, the lock groove locks the intermediate part of the spring material when the nut rotates in the loosening direction, so the nut can be easily and accurately stopped. It will be possible.

According to the third aspect of the invention, when the nut is tightened and the lock cover is mounted on the nut, the lock cover is held by the locking means so as not to come off from the nut. In this state, since the fitting hole of the lock cover fits into the spline portion, rotation about the axis of the bolt is restricted. Therefore, when the nut tries to rotate, the side surfaces of the lock cover interfere with each other, so that it is possible to easily and appropriately prevent the nut from rotating.

According to the fourth invention, even if the assembling angle of the lock cover is deviated, the gap between the nut and the nut absorbs the phase difference. Therefore, the fitting hole of the lock cover cannot be formed in the spline portion of the bolt tip. It becomes possible to fit without.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 10 denotes a gear arm of a steering device, which is fastened with a nut 12 to a ball stud 11 of a drag link. To prevent the nut 12 from rotating, a spring member 13 having a substantially C shape is provided, and lock pins 14 are formed at both ends of the lock member 14 so as to concentrically face inward. An annular wall 15 surrounding the screw hole is provided on the upper surface of the nut 12,
An insertion hole 16 is formed through the lock pin 14 in the radial direction so as to freely move back and forth.

When the spring member 13 is opened at both ends of the nut 12 and inserted into the insertion hole 16, the lock pin is attached so that the lock pin projects in the inner diameter direction of the annular wall 15. A plurality of lock grooves 17 for locking the lock pins 14 on both sides on the outer circumference of the ball stud 11 as a set are arranged at equal intervals on the same circumference. These grooves 17 are provided with a locking surface 17a of the lock pin 14 in the loosening direction of the nut 12, and an inclined surface 17b which allows the lock pin 14 to climb over only in the tightening direction of the nut 12 is formed at the bottom thereof.

With such a structure, the ball stud 1
It is sufficient to tighten the gear arm 10 with the nut 12 to some extent and then assemble the spring member 13 to the nut 12. When the nut 12 rotates in the tightening direction, the lock pin 14 gets over the lock groove 17, but When the nut 12 is rotated in the loosening direction, the lock groove 17 locks the lock pin 14. Therefore, as in the conventional case, a hole is aligned for inserting the split pin, or the pin tip side is bent after the insertion. Compared with the above, the rotation of the nut 12 can be stopped easily and appropriately.

FIGS. 2 and 3 show another embodiment, which is a substantially C-shaped spring member 23 extending radially over the screw hole of the nut 22.
And an annular wall 25 surrounding the screw hole on the upper surface of the nut 22.
A mounting hole 26 for receiving both ends of the spring member 23 is formed therein. A circular concave portion 28 is formed on the tip end surface of the ball stud 21 so that the central portion thereof escapes the spring material 23, and a plurality of lock grooves 27 are formed on the circumferential surface remaining around the peripheral portion as a set on both sides. They are arranged at equal intervals. These grooves 27
Is provided with a locking surface 27a of the spring member 23 in the loosening direction of the nut 22, and the spring member 2 is provided at the bottom thereof only in the tightening direction of the nut 22.
An inclined surface 27b is formed to allow the vehicle to climb over 3.

According to this, the spring member 23 may be assembled to the nut 22 after the gear arm 20 is tightened to some extent with the ball stud 21 by the nut 22, and when the nut 22 is rotated in the tightening direction, the spring member 23 is Although it goes over the lock groove 27 while coming into contact with the tip end surface of the ball stud 21 at an intermediate portion that straddles the screw hole, the lock groove 27 moves in the middle of the spring member 23 when the nut 22 rotates in the loosening direction. Since the parts are locked, the rotation of the nut 22 can be stopped easily and appropriately as in the above-described embodiment.

4 and 5 show another embodiment, in which a spline portion 39 is formed at the tip of the ball stud 31. A lock cover 40, which is similar to the nut 32 and covers each side surface from the top surface, is provided, and a lock hole (fitting hole) that engages with the spline portion 39 of the ball stud 31 at the center of the bottom surface thereof.
41 are formed. In this case, on the side surface of the nut 32, locking grooves 42 extending at the same height and extending over both corners are provided every other hexagonal shape, and the locking cover 40 is provided with the locking grooves 42.
Locking claws 43 that engage with the respective locking grooves 42 are formed when they are covered from above.

With this structure, the ball stud 3
After the tightening of the gear arm 30 to the No. 1 is completed, when the lock cover 40 is put on the nut 32 from above, the lock claw 43 engages with the locking groove 42, so that the lock cover 4
0 is prevented from coming off from the nut 32 so as not to come off in the axial direction. In this state, since the lock cover 40 is fitted into the spline portion 39 through the lock hole 41, the ball stud 31
Relative rotation with is restricted. Therefore, when the nut 32 tries to rotate, the side surface of the lock cover 40 interferes with the rotation of the nut 32, so that the rotation of the nut 32 can be stopped easily and appropriately.

Between the side surface of the lock cover 40 and the side surface of the nut 32, the lock cover 40 to the ball stud 31 is provided.
By providing a predetermined gap 44 for adjusting the assembling angle of, even if the assembling angle of the lock cover 40 is deviated,
Since the phase difference with the nut 32 is absorbed by the gap 44, the lock hole 41 can be fitted into the spline portion 39 without difficulty.

[0021]

According to the first aspect of the present invention, in the nut rotation preventing device tightened to the bolt, the insertion hole penetrating the nut in the radial direction, the lock pin inserted into the insertion hole so as to freely move back and forth, and the lock. Equipped with a spring material that urges the pin to project to the inner circumference of the nut, a plurality of lock grooves that lock the lock pin when tightening the nut are arranged on the same circumference of the bolt outer peripheral surface. Since the inclined surface is formed on the bottom to allow the lock pin to climb over only in the tightening direction of the nut, the lock pin can be easily and easily assembled, and the nut can be tightened in that assembled state. Can be performed efficiently and reliably.

According to the second aspect of the present invention, the nut rotation preventing device for tightening to the bolt is provided with a substantially C-shaped spring member which is assembled so as to straddle the upper surface of the nut in the radial direction.
A plurality of radially extending lock grooves are radially arranged on the tip surface of the bolt that abuts the intermediate portion of the spring material when tightening the nut.
Since the inclined surfaces that allow the spring material to pass over only in the nut tightening direction are formed at the bottoms of these grooves, it is possible to easily and appropriately prevent the nut from rotating, as in the first aspect of the invention.

According to a third aspect of the present invention, in a rotation preventing device for a nut to be tightened to a bolt, a lock cover for covering the nut from the upper surface to the side surface is provided, and locking means for preventing the lock cover from coming off the nut is provided, while the bolt Since the spline portion is formed at the tip and the fitting hole is provided in the lock cover, the nut rotation can be properly stopped by a simple and easy work of just assembling the lock cover.

According to the fourth aspect of the present invention, a gap is provided between the side surface of the lock cover and the side surface of the nut for adjusting the mounting angle of the lock cover to the bolt tip. Even if there is a deviation, the gap between the nut and the nut absorbs the phase difference, so that it is possible to fit the fitting hole of the lock cover to the spline portion of the bolt tip without difficulty.

[Brief description of drawings]

FIG. 1 is a side view and a plan view of an assembled state showing an embodiment of the present invention.

FIG. 2 is a side view and a plan view of an assembled state showing another embodiment.

FIG. 3 is a side view of the ball stud and a plan view thereof.

FIG. 4 is a sectional view and a plan view of an assembled state showing another embodiment.

FIG. 5 is a perspective view of the lock cover of the same.

FIG. 6 is a side view and a plan view of a conventional example in an assembled state.

[Explanation of symbols]

 11, 21, 31 Ball stud 12, 22, 32 Nut 13, 23 Spring material 14 Lock pin 16 Insert hole 17, 27 Lock groove 17a, 27a Locking surface 17b, 27b Inclined surface 26 Mounting hole 39 Spline part 40 Lock cover 41 Lock hole 42 Locking groove 43 Lock claw 44 Gap

Claims (4)

[Claims] 1. A device for preventing rotation of a nut tightened to a bolt, wherein an insertion hole that penetrates the nut in a radial direction, a lock pin that is freely inserted into the insertion hole, and a lock pin that protrudes toward the inner circumference of the nut. A plurality of lock grooves that lock the lock pin when tightening the nut are arranged on the same circumference of the outer peripheral surface of the bolt, and the bottom of these grooves in the nut tightening direction. An anti-rotation device for nuts, characterized in that an inclined surface is formed to allow only the lock pin to climb over. 2. A nut detent device for tightening a bolt, comprising a substantially C-shaped spring member assembled so as to straddle the upper surface of the nut in the radial direction, and the bolt hitting an intermediate portion of the spring member when tightening the nut. Around the nut characterized in that a plurality of radially extending lock grooves are radially arranged on the tip end surface, and an inclined surface is formed at the bottom of these grooves to allow the spring material to pass over only in the nut tightening direction. Stop device. 3. A nut rotation preventing device to be tightened to a bolt, comprising a lock cover for covering the nut from the upper surface to the side surface, providing locking means for preventing the lock cover from coming off the nut, and forming a spline portion at the tip of the bolt. In addition, the nut locking device is characterized in that the fitting hole is provided in the lock cover. 4. The detent device according to claim 3, wherein a gap is provided between a side surface of the lock cover and a side surface of the nut for adjusting an assembling angle of the lock cover to the tip of the bolt. .