JP2021183865A - Lock nut - Google Patents

Abstract

To provide a lock nut having an improved fastening effect of a nut when fastened to a bolt while reducing manufacturing cost with a simple configuration and facilitating operation.SOLUTION: A lock nut 1 of the present invention includes: a first nut 10 having a polygonal part 11, a cylindrical part 12 projecting on the polygonal part 11, a first screw part 13 penetrating the polygonal part 11 and the cylindrical part 12 in an axial direction, and a second screw part 14 formed on an outer periphery of the cylindrical part 12; and a second nut 20 having a third screw part 21 which threadedly engages with the second screw part 14 of the cylindrical part 12. The cylindrical part 11 of the first nut 10 is formed in a tapered shape, and the third screw part 21 of the second nut 20 is formed in a tapered shape which threadedly engages with the second screw part 14. Also, a cutout part 15 is formed on the cylindrical part 12 of the first nut 10. In another embodiment, a lock washer 40 is interposed between the first nut 10 and the second nut 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a locknut having a simple structure, easy operation, and capable of improving the tightening effect of the nut when fastened to a bolt.

Generally, bolts and nuts are used to connect two or more members. At this time, a bolt is inserted into the through hole of the member, and the nut is screwed from the tip of the bolt to tighten the nut.

However, as time goes by, there arises a problem that the nut loosens due to the generation of vibration and the deformation of the member, and the tightening effect decreases. Therefore, it was necessary to carry out regular inspections and tighten nuts.

As a conventional technique for solving these problems, a removal prevention function that can easily and surely tighten a nut with an accurate tightening torque and prevents it from being easily removed by mischief after tightening. There are nuts with, and special double nuts to prevent loosening (see, for example, Patent Document 1).
The nut having the removal prevention function of Patent Document 1 and the special double nut for preventing loosening are provided in the nut body having a screw hole penetrating in the axial direction and formed in the center of the shaft, and in the upper part of the nut body in the axial direction. It is integrally molded with a provided rotary tool engaging portion and a connecting portion that connects the nut body and the rotary tool engaging portion, and has a diameter larger than the diameter of the screw hole in the shaft center portion of the rotary tool engaging portion. When the rotating tool engaging part is fastened with a tightening torque exceeding a predetermined torque by the rotating tool engaged with the rotating tool engaging part, the connecting part breaks, which causes the rotating tool from the nut body. It is characterized in that the engaging portion is separated.
Japanese Unexamined Patent Publication No. 2007-40344

However, the nut having the removal prevention function of Patent Document 1 and the special double nut for preventing loosening have a problem that the number of parts increases, the cost increases, and the work efficiency also decreases. Further, at the time of storage, there is a drawback that the separate members must be stored and managed in a disassembled state.

Therefore, in view of the above points, the present invention provides a locknut that can reduce the manufacturing cost with a simple structure, facilitate the operation, and improve the tightening effect of the nut when fastened to the bolt. be.

Means to solve the solution

In order to solve the above problems, the lock nut of the present invention includes a polygonal portion, a tubular portion protruding from the polygonal portion, and a first screw portion that axially penetrates the polygonal portion and the tubular portion. A first nut including a second screw portion formed on the outer periphery of the tubular portion, and a second nut including a third screw portion to be integrated with the second screw portion of the tubular portion. The lock nut is characterized in that the tubular portion of the first nut is formed in a tapered shape, and the third screw portion of the second nut is formed in a tapered shape to be screwed into the second screw portion.

In addition, a notch was formed in the tubular portion of the first nut.

Further, at least one notch portion is communicated with the polygonal portion.

Further, a chrysanthemum washer was interposed between the first nut and the second nut.

The invention's effect

The tubular part of the first nut is formed in a tapered shape, and the third screw part of the front second nut is formed in a tapered shape to be screwed into the second screw part, so that the first nut is screwed onto the bolt. Furthermore, by screwing the tubular part of the first nut into the opening of the second nut, the protruding part of the first nut is tightened by the tapered part of the second nut and fastened in a state of being locked to the bolt. can do.

Further, by forming a notch in the tubular portion of the first nut, the tightening strength of the first nut and the second nut can be further increased like the chuck type nut.

It is a perspective view of the locknut in this invention. It is a top view of the locknut. The first nut is attached to the bolt. The second nut is attached to the first nut. (A) is a front view of the Kiku washer, and (b) is a plan view of the Kiku washer. This is an example of use with a Kiku washer attached. Another embodiment shows a notch that communicates to the polygonal portion.

Hereinafter, embodiments of the locknut of the present invention will be described with reference to the drawings.
The locknut of the present invention is characterized by having a simple structure, reducing manufacturing costs, facilitating operation, and improving the tightening effect of the nut when fastened to a bolt.

The locknut 1 shown in FIGS. 1 and 2 has a first that axially penetrates the polygonal portion 11, the tubular portion 12 protruding from the polygonal portion 11, and the polygonal portion 11 and the tubular portion 12. A first nut 10 having a screw portion 13 and a second screw portion 14 formed on the outer periphery of the tubular portion 12, and a third screw portion coupled to the second screw portion 14 of the tubular portion 12. A second nut 30 including 21 is provided.

The first nut 10 shown in (b) of FIG. 1 and (b) of FIG. 2 is formed by a polygonal portion 11 of the head and a tubular portion 12 arranged on the bottom surface of the polygonal portion 11. There is. Further, a first screw portion 13 penetrating in the axial direction is engraved in the central portion of the polygonal portion 11 and the tubular portion 12. The first screw portion 13 is formed by screwing the screw portion 31 of the bolt 30 shown in FIG. 1 (a) and FIG. 2 (a).

The tubular portion 12 is arranged on the bottom surface of the polygonal portion 11, and the first screw portion 13 is engraved on the inner circumference and the second screw portion 14 is engraved on the outer circumference. Further, in particular, the tubular portion 12 has a slightly tapered tapered shape in a plan view. Further, a notch portion 15 is formed in the tubular portion 12. A plurality of such notches 15 are provided in the vertical direction of the tubular portion 12. A curved recess 16 in which a washer is arranged is formed between the polygonal portion 11 and the tubular portion 12.

The second nut 20 shown in (c) of FIG. 1 and (c) of FIG. 2 is screwed into the second screw portion 14 of the tubular portion 12 of the first nut 10, and has a polygonal shape as a whole. The third screw portion 21 is formed in the central portion. In particular, the third screw portion 21 is formed in a tapered shape so as to be screwed into the second screw portion 14.

Further, as another preferable example, as shown in FIG. 7, it is preferable to form at least one portion of the notch portion 15 in a state of communicating with the polygonal portion 11. By forming the notch portion 15 in a state of communicating with the polygonal portion 11, the improvement of the tightening strength can be further enhanced.

As another preferred example, a chrysanthemum washer 40 was interposed between the first nut 10 and the second nut 20. The chrysanthemum washer 40 shown in FIGS. 5A and 5 has a circular main body 41, an inner claw 42 formed on the inner circumference of the main body 41, and an outer claw 42 formed on the outer periphery of the main body 41. It is formed by a claw 43.

Therefore, as shown in FIG. 6, the chrysanthemum washer 40 is interposed between the first nut 10 and the second nut 20, the inner claw 42 is arranged in the notch portion 15, and the outer claw 43 is the second nut. By bending to the 20 side, loosening of the first nut 10 and the second nut 20 can be prevented more effectively.

Next, a method of using the locknut of the present invention will be described with reference to FIGS. 3 and 4.
In FIG. 3, the bolt 30 is attached to the member 2, the first screw portion 13 of the first nut 10 is screwed into the screw portion 31 of the bolt 30, and the member 2 is fixed by the first nut 10.

Next, as shown in FIG. 4, the third screw portion 21 of the second nut 20 is screwed into the second screw portion 14 of the first nut 10. At this time, since the second screw portion 14 and the third screw portion 21 have a tapered shape, the tightening effect is improved. Further, by tightening the second nut 20, the notch portion 15 is tightened from both side surfaces, the tightening strength of the first nut 10 and the second nut 20 is further improved, and loosening of the nut due to aging can be efficiently prevented.

With the above configuration, in the lock nut of the present invention, the tubular portion 12 of the first nut 10 can be formed in a tapered shape, and the third screw portion 21 of the front second nut 20 can be screwed into the second screw portion 14. Due to the tapered shape, the first nut 10 is screwed into the screw portion 31 of the bolt 30, and the third screw portion 21 of the second nut 20 is screwed into the tubular portion 12 of the first nut 10. As a result, the first nut 10 and the second nut 20 are efficiently tightened, and loosening of the nuts can be prevented.

Further, by forming the notch portion 15 in the tubular portion 12 of the first nut 10, the tightening strength of the first nut 10 and the second nut 20 can be further increased like the chuck type nut.

1 Lock nut 2 Member 10 First nut 11 Polygonal part 12 Cylindrical part 13 First screw part 14 Second screw part 15 Notch part 16 Recess 20 Second nut 21 Third screw part 30 Bolt 31 Screw part 40 Kiku washer 41 Main body 42 Inner claw 43 Outer claw

Claims (4)

A polygonal portion, a tubular portion protruding from the polygonal portion, a first screw portion that penetrates the polygonal portion and the tubular portion in the axial direction, and a second screw formed on the outer periphery of the tubular portion. In a lock nut comprising a first nut comprising a portion and a second nut including a third screw portion coupled to a second screw portion of the tubular portion, the tubular portion of the first nut is provided. A lock nut characterized in that the third screw portion of the second nut is formed in a tapered shape and the third screw portion of the second nut is screwed into the second screw portion. The locknut according to claim 1, wherein a notch is formed in the tubular portion of the first nut. The locknut according to claim 2, wherein at least one of the notches is communicated with a polygonal portion. The locknut according to any one of claims 1 to 3, wherein a chrysanthemum washer is interposed between the first nut and the second nut.

Images