JP6096420B2 - Lock nut - Google Patents

Description

  The present invention relates to a lock nut that has a simple structure and is easy to operate, improves a tightening effect when fastened to a bolt, and can connect two nuts.

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

  However, as time goes on, there is a problem that the nut is loosened due to the occurrence of vibration or deformation of the member, and the tightening effect is lowered. Therefore, it was necessary to perform regular inspections and tighten nuts.

As a conventional technology that solves these problems, the nut can be easily and reliably tightened with an accurate tightening torque, and it is not possible to easily remove the nut after it has been tightened. And a special double nut that prevents loosening (see, for example, Patent Document 1).
The nut having the removal preventing function and the special double nut for preventing loosening disclosed in the above-mentioned Patent Document 1 include a nut body formed at the center of the shaft with a screw hole penetrating in the axial direction, and an axially upper portion of the nut body. The rotating tool engaging portion provided and a connecting portion for connecting the nut body and the rotating tool engaging portion are integrally formed, and the diameter of the rotating tool engaging portion is larger than the diameter of the screw hole. When the rotary tool engaging portion is fastened with a tightening torque exceeding a predetermined torque by the rotary tool engaged with the rotary tool engaging portion, the connecting portion is broken, thereby causing the rotary tool to rotate from the nut body. The engaging portion is separated.
JP 2007-40344 A

  However, the nut having the removal preventing function and the special double nut for preventing loosening described in the above-mentioned Patent Document 1 have a problem that the number of parts is increased, resulting in an increase in cost and a reduction in work efficiency. In addition, there is a drawback that storage management must be performed in a state in which separate members are disassembled during storage.

  Therefore, in view of the above points, the present invention can reduce the manufacturing cost with a simple structure, facilitate the operation, improve the tightening effect when fastened to the bolt, and connect the two members together. It is to provide a lock nut that can.

Means for solving the solution

  In order to solve the above-mentioned problems, a lock nut of the present invention includes a first nut having a screw hole penetrating in the center in the axial direction and having a polygonal portion formed on the outer periphery, and a second nut attached to the first nut. In the lock nut to be configured, the first nut includes a cylindrical portion formed at a location excluding the polygonal portion on the outer periphery of the screw hole, a protruding portion formed at the tip of the cylindrical portion, and a cylindrical shape And a cut portion formed in the portion.

Further, at least one cut portion is formed in the cylindrical portion .

  Further, the second nut has a screw hole penetrating in the center in the axial direction, a polygonal part is formed on the outer periphery, and an opening part into which the cylindrical part of the first nut is fitted is formed in the center in the axial direction. A pointed taper portion is formed at the tip of the opening.

  A cut portion was formed in the second nut.

  Moreover, the convex part for latching was formed in the cylindrical part of the 1st nut.

  Further, a locking recess in which the locking protrusion of the first nut is disposed is formed in the opening of the second nut.

  Further, a waterproof washer was attached to the first nut.

Effect of the invention

  The first nut is a cylindrical portion formed at a location excluding the polygonal portion on the outer periphery of the screw hole, a protruding portion formed at the tip of the cylindrical portion, and a cut portion formed in the cylindrical portion The second nut has a screw hole penetrating in the center in the axial direction, a polygonal portion is formed on the outer periphery, and an opening portion in which the cylindrical portion of the first nut is fitted in the center in the axial direction is formed Since the tip of the opening has a pointed taper, the second nut and the first nut are screwed onto the bolt, and the first nut is inserted into the opening of the second nut. By fitting the tubular portion, the protruding portion of the first nut is fastened to the tapered portion of the second nut and fastened in a state of being locked to the bolt.

  Further, by forming the cut portion in the cylindrical portion of the first nut and the polygonal portion of the second nut, the tightening strength of the first nut and the second nut can be further increased as in the case of the chuck type nut.

  Furthermore, a locking projection is formed in the cylindrical portion of the first nut, and a locking recess in which the locking projection of the first nut is arranged is formed in the opening portion of the second nut. By pressing the cylindrical portion of the first nut, the locking convex portion is locked to the locking concave portion, and the first nut and the second nut are held in an integrally connected state. The Therefore, it is not necessary to store each member separately, and convenience is improved.

It is a perspective view of the lock nut in the present invention. It is a use state sectional view of the lock nut. It is a perspective view of the lock nut which provided the notch in the 2nd nut. It is a perspective view of the lock nut which is another suitable example. It is a use state sectional view of the lock nut.

Embodiments of the lock nut of the present invention will be described below with reference to the drawings.
The lock nut of the present invention has a simple structure that reduces manufacturing costs, facilitates operation, improves the tightening effect when fastened to a bolt, and allows two members to be connected. And

  The illustrated lock nut 1 includes a first nut 10 having a screw hole 11 penetrating in the center in the axial direction and having a polygonal portion 12 formed on the outer periphery, and a second nut 20 attached to the first nut 10. The

  The first nut 10 is formed on the outer periphery of the screw hole 11 and excluding the polygonal part 12. The first nut 10 has a cylindrical part 13 in which the screw hole 11 is threaded on the inner periphery and a tip of the cylindrical part 13. The formed projecting part 14 and the notch part 15 formed in the cylindrical part 13 are provided.

  The cut portion 15 is formed from the base portion of the polygonal portion 12 to the tip of the protruding portion 14. Further, at least one cut portion 15 is formed in the cylindrical portion 13. In particular, when considering the processing surface and the fastening effect, it is preferable to form four locations.

  Further, the second nut 20 has a screw hole 21 penetrating in the center in the axial direction, a polygonal portion 22 formed on the outer periphery, and an opening in which the cylindrical portion 13 of the first nut 10 is fitted in the center in the axial direction. A portion 23 is formed. A pointed taper portion 24 is formed at the tip of the opening portion 23.

Since the first nut 10 and the second nut 20 have the above-described structure, the inner diameter is smaller than the outer diameter of the projecting portion 14 of the second nut 20 as shown by a one-dot chain line in FIG. The cylindrical portion 13 of the first nut 10 is disposed in the cylindrical opening portion 23 of the first nut 10 and the first nut 10 is screwed into the cylindrical portion 13 of the first nut 10 as shown in FIG. It is fitted into the opening 23 of the secondary nut 20, fastening force of the bolt 30 by the cylindrical portion 13 is arising. The fastening force is maintained while the projecting portion 14 is in contact with and positioned on the linear inner peripheral surface 23 a of the opening portion 23. When the first nut 10 is further screwed in, as shown in (c), the projecting portion 14 of the first nut 10 is tightened by the taper portion 24 of the second nut 20, and the cut portion 15 is pressed and compressed. The fastening force with the bolt 30 is improved, and the first nut 10 and the second nut 20 are locked. In the figure, reference numeral 40 denotes a member to be fastened that is fastened by the lock nut 1.

  As another suitable example, as shown in FIG. 3, a cut portion 25 may be formed in the polygonal portion 22 of the second nut 20. The cut portion 25 is formed from the upper surface of the opening portion 23 to the vicinity of the threaded portion of the screw hole 21. Moreover, it is preferable to form the said cut | notch part 25 in the polygonal part 22 at least one place, Preferably four places. When the first nut 10 is tightened by forming the cut portion 25 in the polygonal portion 22 of the second nut 20, the second nut 20 is opened, and the first nut 10, the second nut 20, The locked state can be suitably performed.

  As another preferred example, as shown in FIG. 4, in the lock nut 1 of the present invention, a locking convex portion 16 is formed on the tubular portion 13 of the first nut 10, and an opening portion of the second nut 20 is formed. A locking recess 26 in which the locking projection 16 of the first nut 10 is disposed can also be formed in 23.

  Since the lock nut 1 of the present invention has the above-described configuration, the locking nut 1 of the first nut 10 is pressed by pressing the cylindrical portion 13 of the first nut 10 against the opening 23 of the second nut 20. 16 is inserted into the locking recess 26 of the second nut 20. Therefore, the first nut 10 and the second nut 20 are integrally connected, and convenience during storage and transportation is improved.

In addition, as shown by the chain line in FIG. 5 (a), the second nut of smaller inner diameter than the outer diameter of the locking projections 16 of the 20 cylindrical tubular portion 13 of the first nut 10 to the opening 23 , And the first nut 10 is screwed into the bolt 30 so that the locking projection 16 of the first nut 10 is disposed in the locking recess 26 of the second nut 20 as shown in FIG. You can also. When the first nut 10 is further screwed in this state, as shown in (c), the locking projection 16 of the first nut 10 comes out of the locking recess 26 and the opening 23 of the second nut 20 is opened. Are tightened by the inner peripheral surface 23a , the cut portion 15 is pressed and compressed, and the fastening force to the bolt 30 by the tubular portion 13 is generated , and the first nut 10 and the second nut 20 are locked. . The fastening force is maintained while the locking convex portion 16 is in contact with and positioned on the linear inner peripheral surface 23a of the opening portion 23. Furthermore, the bolt 30 is tightened more strongly at the cylindrical portion by contacting the tapered portion 24 and the tapered portion at the tip of the locking convex portion 16.

  As another preferred example, a waterproof washer 17 may be attached to the first nut 10. The washer 17 is formed of a material having excellent waterproofness and flexibility such as resin rubber, and is attached to the base of the cylindrical portion 13 of the first nut 10. By attaching the washer 17 to the first nut 10, it is possible to prevent rainwater or the like from entering the inside from the cut portion 15.

  With the above-described configuration, the lock nut of the present invention has a simple structure that reduces manufacturing costs, facilitates operation, improves the tightening effect when fastened to the bolt, and connects the two members together. be able to.

DESCRIPTION OF SYMBOLS 1 Lock nut 10 1st nut 11 Screw hole 12 Polygonal part 13 Tubular part 14 Projection part 15 Notch part 16 Locking convex part 17 Washer 20 Second nut 21 Screw hole 22 Polygon part 23 Opening part
23a inner peripheral surface 24 taper portion 25 notch portion 26 locking recess 30 bolt 40 fastened member

Claims (6)

A screw hole that is screwed into the bolt is penetrated in the center in the axial direction, and includes a first nut having a polygonal portion formed on the outer periphery, and a second nut screwed into the bolt and attached to the first nut. In the lock nut
The first nut includes a cylindrical portion formed at a location excluding the polygonal portion on the outer periphery of the screw hole, a protruding portion formed to protrude on the outer periphery of the tip of the cylindrical portion, and the cylindrical shape A notch formed in the part,
The second nut is provided with a cylindrical opening having a diameter smaller than the outer diameter of the protruding portion and the protruding portion is fitted therein.
The projecting portion is fitted into the opening portion, the projecting portion comes into contact with the inner peripheral surface of the opening portion, and the cut portion of the tubular portion is pressed and compressed, thereby the tubular portion. The inner peripheral surface (excluding the notch portion) of the tip of the bolt contacts the outer peripheral surface of the bolt over the entire circumference, and the bolt is uniformly fastened from the entire circumference of the inner peripheral surface of the tip of the cylindrical portion to the bolt As power develops,
The lock nut is characterized in that the fastening force is maintained while the projecting portion is in contact with and positioned on the inner peripheral surface of the opening portion. In the second nut, a screw hole that is screwed into the bolt is penetrated in the center in the axial direction, a polygonal portion is formed on the outer periphery, and the cylindrical portion of the first nut is inserted in the center in the axial direction. A hole portion is formed, a tapered portion is formed at the tip of the opening portion, and the taper portion and the tapered portion at the tip of the projecting portion are brought into contact with each other so that the bolt is formed by the tubular portion. lock nut of stronger tightening Ru according to claim 1, wherein the. A screw hole that is screwed into the bolt is penetrated in the center in the axial direction, and includes a first nut having a polygonal portion formed on the outer periphery, and a second nut screwed into the bolt and attached to the first nut. In the lock nut
The first nut includes a cylindrical portion formed on the outer periphery of the screw hole and excluding the polygonal portion, a locking convex portion protruding from the outer periphery of the cylindrical portion, and the cylindrical portion And a notch formed in the
The second nut, and the engagement with locking projections are fitted the engagement cylindrical apertures of smaller diameter than the outer diameter of the stopper protrusion, the locking projection is formed on the aperture unit A locking recess in which the part is arranged,
The front end of the cylindrical portion is formed by the locking convex portion coming out of the locking concave portion, contacting the inner peripheral surface of the opening portion, and pressing and compressing the cut portion of the cylindrical portion . The inner peripheral surface (excluding the notch portion) of the bolt contacts the outer peripheral surface of the bolt over the entire periphery, and a uniform fastening force from the entire periphery of the inner peripheral surface of the tip of the cylindrical portion to the bolt is obtained. As it occurs,
The lock nut is characterized in that the fastening force is maintained while the locking convex portion is in contact with and positioned on the inner peripheral surface of the opening portion. In the second nut, a screw hole that is screwed into the bolt is penetrated in the center in the axial direction, a polygonal part is formed on the outer periphery, and a convex protrusion for locking the first nut is inserted in the center in the axial direction. An opening portion is formed, a pointed taper portion is formed at the tip of the opening portion, and the taper portion and the taper portion at the tip of the locking convex portion are in contact with each other to form the tubular shape lock nut according to claim 3, wherein tighten more strongly the bolt by parts. The lock nut according to any one of claims 1 to 4 , wherein a cut portion is formed also in the second nut. Wherein the first nut, any one locknut of claims 1 to 5 fitted with washers for waterproofing.

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