JP6901260B2 - Loosening prevention nut - Google Patents

Description

The present invention relates to a nut which is a set of two types of nuts, and which holds a screw screwed according to a tightening condition and exerts a loosening prevention function.

Today, nuts with a locking function have a wedge action on the screw fitting part due to the wedge action of the protruding part that fits eccentrically with respect to the screw hole and the truncated cone-shaped tapered surface of the recess when tightening the nut. A locking method in which a pressing force is applied in a perpendicular direction (see Patent Document 1 below), and a locking nut in which the convex portion of the first nut and the concave portion of the second washer are eccentrically fitted (Patent Document 1 below). 2) is known.

On the other hand, when the conical protrusion of the first nut and the through hole of the second nut are fitted, a double nut that can exert a loosening prevention effect due to contact interference between the protrusion and the through hole (Patent Document 3 below). (See), or by rotating and tightening the first nut, which consists of the first nut and the second washer, the convex tapered outer peripheral surface of the first nut is pressed inward against the concave tapered inner peripheral surface of the second washer. , A loosening prevention nut (see Patent Document 4 or 5 below) in which the biting claw of the first nut strongly adheres to the thread of the bolt shaft due to its action is known.
The conventional techniques are common in that two types of nuts are used as a set to obtain a locking function.

Special Fair 3-526 Gazette Japanese Unexamined Patent Publication No. 2015-203492 Special Fair 6-80325 Gazette Japanese Unexamined Patent Publication No. 2015-165154 Utility Model Registration No. 3205075

However, in any of the above techniques, the management of the two types of nuts is complicated, and it is difficult to integrally screw the two types of nuts, which hinders efficient work. There is a problem that the management and construction of the nuts are complicated.

The present invention has been made in view of the above circumstances, and it is possible to integrally screw two types of nuts, the nuts can be easily managed, and efficient work is possible. The purpose is to provide a locking nut.

The anti-loosening nut according to the present invention made to solve the above problems consists of two types of nuts having similar screw holes, one nut having a convex portion at the end and the other nut having a convex portion at the end. The convex portion is provided with a concave portion through which the convex portion can enter, and the front end (entry direction) of the convex portion is divided into a plurality of holding pieces , and the concave portion is the tip portion (end in the direction in which the convex portion enters). The inner circumference of the convex portion) is provided with a front-spreading welcoming portion in which the tip of the convex portion can slide in and out in the front-rear direction, and the center of advance / retreat of the convex portion is located on the inner circumference behind the convex portion (in the approach direction of the convex portion). A guide portion that regulates on the rotation axis of the concave nut is provided, and the tip of the convex portion incorporated in the concave portion is pressed toward the rotation axis on the rear inner circumference thereof (convex). It is characterized by having an guiding portion (which narrows toward the back in the approaching direction of the portion).

The sandwiching piece may also be configured as a locking nut having a structure having a wide portion that is in pressure contact with the guide portion.

According to the anti-loosening nut according to the present invention, the end portion of one nut is provided with a convex portion, and the end portion of the other nut is provided with a concave portion deeper than the convex portion through which the convex portion can enter. Due to the presence of the moving part and the guide part, the arrangement of both nuts can be easily adjusted to the same pitch of the screw holes, and both nuts can be integrally screwed into the bolt, which enables efficient work.
Further, by adopting the configuration including the wide portion, the integrity of both nuts can be easily enhanced.

Further, by having the above configuration, by managing the two types of nuts in an integrated state by matching their pitches, complicated management of the two types of nuts becomes easy.

It is a vertical cross-sectional view and a front view at the time of the loosening prevention work which shows an example of the loosening prevention nut by this invention. It is a vertical cross-sectional view and a plan view which show an example of the assembly process of the lock nut by this invention. An example of a convex nut constituting the locking nut according to the present invention is shown (A): bottom view, (B): front view, (C): plan view, (D): AA cross-sectional view taken along the arrow, (E). ): BB arrow cross-sectional view, (F): side view, (G): CC arrow cross-sectional view, (H): DD arrow cross-sectional view. An example of a convex nut constituting the locking nut according to the present invention is shown (A): bottom view, (B): front view, (C): plan view, (D): EE arrow cross-sectional view, (E). ): FF cross-sectional view taken along the arrow, (F): side view, (G): cross-sectional view taken along the line GG, (H): cross-sectional view taken along the line HH. An example of a concave nut constituting the locking nut according to the present invention is shown (A): plan view, (B): bottom view, (C): front view, (D): I-I arrow cross-sectional view, (E). ): Side view, (F): JJ arrow cross-sectional view. An example of a concave nut constituting the locking nut according to the present invention is shown (A): cross-sectional view taken along the line I-I, (B): cross-sectional view taken along the line KK, (C): cross-sectional view taken along the line LL. , (D): MM arrow cross-sectional view, (E): NN arrow cross-sectional view, (F): OO arrow cross-sectional view.

Hereinafter, embodiments of the locking nut according to the present invention will be described in detail with reference to the drawings.
The example shown in the figure consists of two types of nuts X and Y having screw holes with matching pitches and diameters (hereinafter referred to as “similar”) (see FIG. 1).
The two types of nuts X and Y are a convex nut (see FIG. 3 or 4) X having a convex portion 3 at the end and a concave portion 10 deeper than the convex portion 3 into which the convex portion 3 can enter. A concave nut (see FIGS. 5 and 6) Y comprising.

The convex nut X of this example includes the screw hole 1 penetrating the center thereof, the head portion 2 of the hexagonal column, and the convex portion 3 protruding from the center of the end face thereof.
The convex portion 3 of this example is provided with a plurality of (six in this example) notches 4 at equal angular intervals on the front side thereof, and is formed on a plurality of (six in this example) holding pieces 5 sandwiching each of the notch portions 4. In addition to being divided, a sliding portion 6 is provided on the outer periphery on the tip end side thereof so that the convex portion 3 smoothly advances and retreats without swinging.
In this example, a tapered portion 7 is provided on the outer periphery of the tip of the convex portion 3.

On the other hand, the concave nut Y of this example includes the same hexagonal column head 8 as the convex nut X, and a through hole 9 penetrating the center of the head 8.
The through hole 9 is provided with the concave portion 10 for accommodating the convex portion 3 in the front portion (a portion in the direction in which the convex portion enters), and is the same as the screw hole 1 of the convex nut X in the rear portion thereof. The screw hole 11 is provided.
The recess 10 of this example is provided with a front-spreading receiving portion 12 on the inner circumference of the tip portion thereof so that the tip of the convex portion 3 can slide in and out of the front-rear direction, and the sliding portion 6 is provided on the rear inner circumference thereof. A guide portion 13 for restricting the center of advancing / retreating on the rotation axis of the concave nut Y is provided, and the tip of the convex portion 3 built in the concave portion 10 slides forward / backward, inward and outward on the rear inner circumference thereof. The guide portion 14 of the above is provided.

The clamping piece 5, the clamping piece 5 each tip evenly widens outwardly from the guide portion 13 in the centrifugal direction of the convex nut X, against the tips of the holding piece 5 to the guide portion 13 The configuration provided with the widening portion 5a for uniform pressure contact contributes to the integration of the two types of nuts X and Y (see FIG. 2), and forms an integral form when screwed with the bolt Z. Desirable for maintenance (see Figure 3).

The locking nut according to the present invention, the convex nut X and the concave nut Y constituting the same, are configured as described above. First, the convex nut X is screwed into the bolt W, and then the concave nut X is made into the same bolt W. A position where the nut Y is screwed and the hexagonal corners (hereinafter referred to as "head angle") of the heads 2 of both nuts X and Y match the phase from the position where the widening portion 5a is in pressure contact with the guide portion 13. It is completed by going through the assembly process of crimping up to and integrating both nuts X and Y into the assembly form (see FIG. 2).

At the time of use, the lock nut according to the present invention is a step of screwing into a designated bolt Z in a state of being integrated in the assembly step and turning both bolts X and Y to a desired position (Fig. 1, top). (See), the step of tightening the convex nut X with a predetermined torque, and the step of crimping only the concave nut Y with a predetermined torque (see the bottom of FIG. 1), thereby mounting and loosening the locking nut. Complete the stopping work.

In the loosening prevention work, the tip of the convex portion 3 is pushed into the screw thread of the screwed bolt Z by the guiding portion 14 of the concave portion 10 with the entry of the convex portion 3, and the said. When each gripping piece 5 of the convex portion 3 grips the bolt Z, the fastening force between the convex nut X and the bolt Z is increased, and the loosening prevention function is exhibited.

The guide portion 13 of this example is a portion that includes a cylindrical equisection cavity having a constant length and includes a position where the phases of the head angles of both nuts X and Y match.
The guide portion 13 can be crimped from a position where the sliding portion 6 or the widening portion 5a is in contact with or in pressure contact with the guide portion 13 to a position where the phases of the head angles of both nuts X and Y match. It is desirable to secure the length.
The approach length of the guide portion 13 is such that the phases of the head angles of both nuts X and Y match at the position where the convex portion 3 reaches the guide portion 14 of the leading extension (terminal squeezing), and the guide portion 13 and the guide portion 13 A length may be adopted in which the assembled form is held at the boundary with the guide portion 14 (see FIG. 1 or FIG. 2).

X convex nut, Y concave nut, Z bolt, W bolt,
1 screw hole, 2 head, 3 convex part, 4 notch part,
5 holding piece, 5a widening part,
6 Sliding part, 7 Tapered part,
8 head, 9 through holes, 10 recesses,
11 screw holes, 12 pick-up parts, 13 guide parts, 14 guide parts,

Claims (2)

It consists of two types of nuts with similar screw holes, one nut having a convex portion at the end and the other nut having a concave portion through which the convex portion can enter.
The tip of the convex portion is divided into a plurality of holding pieces.
The concave portion is provided with a front-spreading welcoming portion on the inner circumference of the tip portion thereof so that the tip of the convex portion can slide in and out in the front-rear direction, and the center of advance / retreat of the convex portion is the other nut on the rear inner circumference thereof. A guide portion that regulates the rotation axis of the shaft is provided, and a leading portion that spreads forward is provided on the rear inner circumference thereof to pressurize the tip of the convex portion built in the concave portion toward the rotation shaft as the convex portion enters. ,
The tip of each of the holding pieces generated by the division of the convex portion is evenly widened outward in the centrifugal direction from the guide portion.
A sliding portion is provided on the outer periphery of the tip side of the convex portion so that the convex portion smoothly advances and retreats without swinging.
The guide portion is provided with a cylindrical equisection cavity having a constant length, and includes a position where the phases of the head angles of the two types of nuts match. The anti-loosening nut according to claim 1, wherein the guide portion has a length in which the phases of the head angles of the two types of nuts match at a position where the convex portion reaches the guide portion.

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