JPH0656512U - Double nut locking structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a double nut loosening prevention structure that does not loosen due to repeated load or vibration. [Structure] A petal-shaped washer having a plurality of petal-shaped pieces which can be bent and brought into contact with the side surface of the nut is provided in the middle of the double nut, and the petal-shaped pieces are respectively attached to either side surface of the double nut. Abut.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double nut locking structure.

[0002]

[Prior art]

 When assembling machines, automobiles, buildings and other parts, tighten them with nuts through bolts and thread forming parts.

Conventionally, as a structure for preventing a nut from loosening, for example, as shown in FIG. 8, a bolt 22 is fitted into a mounting member 23 and is tightened and fixed as a double nut of two nuts 20 and 21. is there.

Further, as shown in FIG. 9, after a bolt 22 is fitted into a mounting member 23 and tightened with a nut 24, a through hole 25 is integrally drilled through the nut 24 and the bolt 22. There is a structure in which 25 is fixed through a split pin 26.

[0005]

[Problems to be solved by the device]

 In the nut anti-loosening structure in which two nuts 20 and 21 are doubled and tightened as shown in FIG. 7, loosening may occur due to repeated load, vibration, and the like.

Further, in the nut locking structure in which a small-diameter through hole 25 is drilled in the nut and bolt as shown in FIG. 8 and the split pin 26 is inserted, extra work such as drilling, split pin insertion, and attachment is required. It requires a lot of work man-hours, and there are problems that various work such as drilling, inserting, and mounting is difficult at a special work site, and the strength of the bolt 22 is reduced because the bolt 22 is drilled.

[0007] Therefore, there has been a problem of a nut locking structure that does not have the above-mentioned problems.

[0008]

[Means for Solving the Problems]

 The present invention has a loosening prevention structure that uses a double nut.A special washer is inserted in the middle of the double nut to prevent loosening by tightening the nut on the bolt and applying repeated load, vibration, etc. The above-mentioned problems can be solved by using the above nut.

That is, by the double nut loosening prevention structure in which a petal-type washer having a plurality of petal-shaped pieces capable of being bent and abutted against the side surface of the nut is provided in the middle of the dull nut, and by the structure of the above-mentioned structure. Among them, at least one of the nuts has a structure in which the contact surface with the petal-shaped washer is a textured surface, which solves the above-mentioned problem.

[0010]

[Action]

 A double nut equipped with a petal-type washer according to the present invention has a petal-type washer fitted between the nuts and nuts, and the petal-shaped pieces of the petal-type washer are alternately bent in opposite directions to form front and rear portions. By attaching the nuts to the side surface of the nuts, it is possible to prevent loosening between the nuts.

Further, in the case where at least one of the nuts has a contact surface with a petal-type washer that has been subjected to knurling or other uneven processing, the uneven surface is pressed against the petal-type washer, which is a so-called clinging. To prevent the nut from loosening.

[0012] In this case, since no stumbling occurs between the nut having the concavo-convex processed surface and the petal-type washer, the nut does not need to bend and abut the petal-shaped piece of the petal-type washer.

Accordingly, the number of petal-shaped pieces of petal-type washers can be reduced by half.

[0014]

【Example】

 The configuration of the present invention will be described below with reference to various embodiments shown in FIGS.

FIG. 1 shows an embodiment of a petal-type washer 1 of the present invention. The petal-type washer 1 is provided with six petal-shaped pieces 2 and 3 corresponding to a hexagonal nut, and a central hole 4 is formed in the shaft center so that the petal-shaped pieces 2 and 3 can be fitted into the nut.

FIG. 2 shows an embodiment of a double nut locking structure using the petal-type washer 1.

When the member 17 is fixed to the member 16, the threaded portion 5 of the member 17 is passed through a through hole (not shown) of the member 16, screwed with a nut 6, and then the petal washer 1 is attached to the threaded portion 5. Get in.

A nut 7 is further screwed onto the petal-type washer 1.

Next, the petal-shaped pieces 2, 2 of the petal-type washer 1 are bent until they come into contact with the nut side surfaces 18 of the nut 6, respectively, and the petal-shaped pieces 3, 3 adjacent to the petal-shaped pieces 2, 2 are bent. Are bent in the opposite directions until they come into contact with the nut side surfaces 19 of the nut 7, and the nuts 6 and 7 are fixed to the petal-type washer 1.

The petal-type washer 1 for the nut 6 can be mounted in advance at a position where the petal-shaped piece 2 can be bent and abutted against the nut side surface 18 of the nut 6, but the nut side surface 19 of the nut 7 is not necessarily a petal. The screw may not be screwed to the position facing the strip 3 and the phases may be shifted. In this case, the petal strip 3 may not be bent or abutted against the nut side surface 19 without being sure. is there.

In the above-mentioned case, as shown in FIG. 3, if the corner portion 8 of the nut side surface 18 or 19 of the hexagonal nut 6 or 7 is cut to form a dodecahedron nut, the petal-shaped pieces 2 and 3 are Each of them can be bent and brought into contact with the nut side surface 18 or 19.

Even if a normal hexahedron nut is used in combination with a petal-type washer 14 having twelve petal-shaped pieces as shown in FIG. 7, one of the petal-shaped pieces will be nuts 6 and 7. It can be bent and abutted on the nut side surface 18 or 19.

The petal-type washer of the present invention is different in size from that of the nuts 6 and 7 depending on the diameter of the screw portion 5 of the member 17 or the diameter of the screwing bolt as shown in FIG. The petal-side washer size should be appropriate for each different size nut.

FIG. 4 shows another embodiment of the petal-type washer 9.

The petal-type washer 9 has a bent portion 10 corresponding to a petal-shaped piece extending in three regular triangles.

In a sense, the petal-shaped washer 1 shown in FIG. 1 lacks one of the petal-shaped pieces 2 or 3.

The regular hexagonal chain line shown in FIG. 4 indicates the relative position of the nut.

FIG. 6 shows an embodiment in which the petal washer 9 having the regular triangle shape is used.

In this case, the surface processing nut 11 and the lock nut 15 are used.

As shown in FIG. 5, the surface processed nut 11 has one of the washer contact surfaces as an uneven processed surface 12 by knurling or the like.

As shown in FIG. 6, when the member 16 and the member 17 are screwed and fixed to each other, the screw portion 5 of the member 17 is passed through a through hole (not shown) of the member 16 and the above-mentioned surface of the screw portion 5 is inserted. The processing nut 11 is screwed in the direction in which the concave-convex processing surface 12 comes into contact with the petal-type washer 9 and tightened.

Next, the petal-type washer 9 is fitted onto the face-worked nut 11, and the lock nut 15 is screwed.

The concavo-convex processed surface 12 of the surface processed nut 11 is bited into the contact surface of the petal-type washer 9 by screwing the lock nut 15.

Finally, as shown in FIG. 5, the bent portion 10 of the petal-type washer 9 is bent until it comes into contact with the nut side surface of the lock nut 15, so that the lock nut 15 and the petal-type washer 9 are fixed to each other.

In this case, since the face-working nut 11 and the petal-type washer 9 are fixed to each other via the uneven surface 12, the petal-shaped piece of the petal-type washer is bent until it comes into contact with the nut side surface of the face-working nut 11. It is not necessary, and therefore, as shown in the petal-type washer 9, the number of bent portions 10 may be three.

[0036]

[Effect of device]

 As described above, according to the present invention, when the two members are fixed to each other by the screw portion, the double nut is used to prevent the loosening. However, the petaloid piece which can be bent and brought into contact with the side surface of the nut in the middle of the double nut. Even if a load or vibration load is applied repeatedly, by inserting a petal-type washer with a plurality of bolts, and after tightening the screws, bend the petal-shaped pieces until they come into contact with the side surfaces of both nuts. Since there is no loosening, the reliability of the entire mechanical equipment is improved, and the construction is easy and the manufacturing and construction can be performed at low cost.

Further, by making the contact surface of at least one of the nuts with the petal-type washer an uneven surface, the petal-shaped piece is bent on the nut side surface of the one of the nuts, and the one of the nuts and the petal-type washer is bent. There is no need to fix them, the double nut loosening prevention process can be cut in half, and the number of petal-shaped pieces of petal-type washers can be halved, further reducing construction costs and petal-type washer processing costs. There is an effect that can be reduced.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of a petal-type washer.

FIG. 2 is a side view showing an embodiment of a double nut loosening prevention structure using the petal-type washer shown in FIG.

FIG. 3 is a plan view of an embodiment of another shape of the nut.

FIG. 4 is a plan view of another embodiment of a petal-type washer.

FIG. 5 is a plan view showing a surface processed nut.

FIG. 6 is a side view showing another embodiment of the double nut loosening prevention structure using the petal washer shown in FIG. 4 and the surface processed nut shown in FIG.

FIG. 7 is a plan view of yet another embodiment of a petal-type washer.

FIG. 8 is a side view of a conventional example of a double nut.

FIG. 9 is a side view of another conventional example of a locking structure for a nut.

[Explanation of symbols]

 1 Petal-type washers 2,3 Petal-shaped pieces 6,7 Nuts 9 Petal-type washers 10 Bends 11 Face processing nuts 12 Concavo-convex processing surface 14 Petal-type washers 15 Lock nuts 18, 19 Nut side surfaces

Claims (2)

[Scope of utility model registration request] 1. A double-nut loosening prevention structure comprising a petal-shaped washer having a plurality of petal-shaped pieces capable of being bent and brought into contact with a side surface of the nut, which is provided in the middle of the double-nut. 2. The double-nut loosening prevention structure according to claim 1, wherein a contact surface of at least one of the nuts and the petal-type washer is an uneven surface.