JPH10306819A - Locking member and locking nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastening means to be used even at a limited space and besides increase a locking effect. SOLUTION: A part of a screw hole 3 joined in a screwed in state with the screw thread 2a of a screw shaft is fitted in a taper recessed part 4 notched obliquely of an axis toward the center of the screw hole 3. In a state before fastening of the screw shaft, a protrusion part protruding to the seat surface side is formed and insertable in a taper recessed part 4 along with press to the protrusion part, and a locking member 1 provided with a screw thread 1a continued to a screw thread 3a of a screw hole 3 is arranged. The protrusion part on which fastening from the seat side is exerted is axially pressed, and the locking member 1 is advanced in the taper recessed part 4. As a result of bearing from a taper surface being applied and a stress in an orthogonal direction to an axis being exerted on the screw thread 1a of the locking member 1, the fastening force of a screw is increased, whereby a using screw shaft is shortened and a sufficient fastening force is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking member for a screw shaft such as a bolt and a nut having a high locking effect.

[0002]

2. Description of the Related Art Hitherto, there has been proposed a fastening means in which a first nut having a boss portion eccentric to a screw hole and a second nut for applying an axial pressure to the boss portion are combined. ing. When bolts are tightened using these nuts, not only axial stress acts on the threads, but also stress in the direction perpendicular to the threads is exerted by the pressing of the eccentric boss. Since it works, the tightening force is increased and the screws are prevented from loosening.

[0003]

However, since this fastening means uses a plurality of nuts, a bolt of a required length corresponding to the nut is required, and there is a problem that it cannot be used in a place where the mounting width is narrow.

An object of the present invention is to provide a fastening means which can be used even in a narrow place and has a high locking effect.

[0005]

In order to solve these problems, according to the present invention, a part of a screw hole to be screwed with a screw thread of a screw shaft is inclined obliquely from a bearing surface toward the center of the screw hole. A projection that is fitted into the cut-out tapered recess and that projects toward the seat surface in a state before the screw shaft is tightened,
According to the present invention, there is provided a locking member provided with a screw thread which can be immersed in the tapered recess with the pressing of the projecting part and is continuous with the screw thread of the screw hole.

When this locking member is fitted into the tapered recess and tightened by a screw shaft using, for example, a bolt, the protrusion is tightened from the seat surface side, and the locking member is pressed in the axial direction. You. As a result, while the axial stress acts on the thread of the screw hole, the locking member is immersed in the tapered recess, and receives the surface pressure from the tapered surface, and is applied to the thread of the locking member in a direction perpendicular to the axis. Stress acts. Since the play between the screw threads is eliminated in different directions, the tightening force of the screw is increased, and a high loosening prevention effect is obtained. Further, since the locking member is housed in the tapered recess, a sufficient tightening force can be ensured even if the screw shaft used is short.

The locking member has a tapered outer surface,
Further, the ring may be provided with a thread continuous with the thread of the screw hole on the inner surface, and the ring may be provided with an axial cutout. Accordingly, the locking member is easily contracted by the cutout portion, so that the locking member is easily immersed in the tapered recess, and the surface pressure can be largely secured. In addition, since the compatibility at the time of fastening is excellent, it is easy to handle.

Further, in the present invention, there is provided a locking nut comprising the main nut having the tapered recess formed at the end on the seat surface side and the locking member. When this locking nut is used, the locking member is housed in the tapered recess of the main nut, as described above, so that a sufficient tightening force can be obtained without using a plurality of nuts.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

A locking member 1 shown in FIG. 1 is formed of a metal ring having an outer surface tapered, and a part of a screw hole 3 screwed with a screw thread 2a of a screw shaft of a bolt 2 from a seat surface. It is formed in such a size that it can be fitted into a tapered recess 4 cut out obliquely in the axial direction toward the center of the screw hole 3. The locking member 1 has a thread 1a formed on the inner surface thereof, the thread 1a being continuous with the thread 3a of the screw hole 3, and a part thereof is cut by a notch 5 in the axial direction.

When the locking member 1 is fitted into the tapered recess 4, a projecting portion 6 is formed as shown in FIG. 2A, which projects toward the seat surface before the screw shaft is tightened. Then, when the screw shaft of the bolt 2 is screwed into each of the threads 1a and 3a of the locking member 1 and the screw hole 3, and tightened, as shown in FIG. 2b, the protrusion 6 is tightened from the seat surface side, and the locking member 1 is pressed in the axial direction. As a result,
While the axial stress acts on the screw thread 3a of the screw hole 3,
The locking member 1 is immersed in the tapered concave portion 4, and receives a surface pressure from the tapered surface, so that a stress in the direction perpendicular to the axis acts on the thread 1 a of the locking member 1.

At this time, since the notch 5 is provided, the locking member 1 is easily contracted and easily immersed in the tapered recess 4, so that a large surface pressure is secured.

The play between the threads 1a, 2a and between the threads 3a, 2a is eliminated in different directions, and the locking member 1 is accommodated in the tapered recess 4, so that the screw shaft used is Even if it is short, sufficient tightening force can be secured, and a high locking effect can be obtained even in a place where the installation width is narrow. In addition, since the compatibility at the time of fastening is excellent, it is easy to handle.

FIG. 3 shows a locking nut according to the present invention. This locking nut comprises a main nut 7 having the tapered recess 4 formed at the end on the seat surface side, and the locking member 1. In the screw hole 8 of the main nut 7,
A screw thread 8a that is continuous with the screw hole 1a of the locking member 1 is formed. Further, the main nut 7 is provided with a flat hexagonal engaging portion 9 which engages with a tightening tool such as a spanner, and a cylindrical portion 10 having the seat surface.

When the locking member 1 is fitted into the tapered recess 4 of the main nut 7, the locking nut shown in FIG.
As shown in FIG. 5, a protruding portion 6 protruding from the bearing surface side of the main nut 7 is formed. In this state, the thread 8a of the main nut 7 is
When the thread 2a of the bolt 2 is screwed into each of the thread 1a of the locking member 1 and the screw 2a, the head 2b of the bolt 2 pushes the protruding portion 6 from the seat side as shown in FIG. The tightening and loosening prevention member 1 is pressed in the axial direction to
Proceed within. While an axial stress acts on the thread 8a of the screw hole 8, a stress in a direction perpendicular to the axis acts on the thread 1a of the locking member 1 due to the surface pressure from the tapered surface.

As a result, similarly to the above embodiment, the thread 1
a, the play between the screw threads 8a, 2a is eliminated in different directions, and the locking member 1 is accommodated in the tapered recess 4, so that even if the screw shaft used is short, sufficient tightening is performed. Power can be secured. Further, since there is no need to use a plurality of nuts, a high locking effect can be obtained even in a place where the mounting width is narrow.

[0017]

As described above, the locking member and the locking nut according to the present invention can secure a sufficient tightening force even if the screw shaft used is short.
Not only can it be used in places where the installation width is narrow, it is also excellent in compatibility at the time of fastening, so it is easy to handle even during replacement, etc., and it is very convenient.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a use state of a locking member according to the present invention.

2A is a cross-sectional view showing a locking member fitted into a tapered recess, and FIG. 2B is a cross-sectional view showing a tightened state by bolts.

FIG. 3 is a perspective view showing a bolt and a locking nut according to the present invention;

FIG. 4A is a cross-sectional view showing a locking nut in which a locking member is fitted into a tapered recess, and FIG. 4B is a cross-sectional view showing a tightened state by bolts;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loose-stopping member 1a Loose-stopping member thread 2 Bolt 2a Bolt thread 2b Head 3 Screw hole 3a Screw hole thread 4 Tapered recess 5 Notch 6 Projection 7 Main nut 8 Main nut screw hole 8a Main Nut thread 9 Engagement part 10 Cylindrical part

Claims (3)

[Claims] 1. A part of a screw hole to be screwed with a screw thread of a screw shaft is fitted into a tapered recess cut out obliquely from a seat surface toward a center of the screw hole in an axially oblique direction. A locking member having a protrusion protruding toward the seat surface in a state before tightening, capable of being immersed in the tapered recess with the pressing of the protrusion, and having a thread continuous with the thread of the screw hole. . 2. A ring having an outer surface formed in a tapered shape and a thread provided on the inner surface with a thread continuous with the thread of the screw hole, the ring having an axial cutout.
3. The locking member according to claim 1. 3. A locking nut comprising: a main nut having the tapered recess formed at an end on a seat surface side; and the locking member according to claim 1 or 2.