WO2002097287A1

WO2002097287A1 - Lock nut, and lockingly tightening structure using the lock nut

Info

Publication number: WO2002097287A1
Application number: PCT/JP2002/004626
Authority: WO
Inventors: Shinya Uehara
Original assignee: Shinya Uehara
Priority date: 2001-05-25
Filing date: 2002-05-13
Publication date: 2002-12-05

Abstract

One set of lock nuts (10) used in combination with a bolt (50) capable of being easily and surely locked with a simple structure and a lockingly tightening structure using the nuts, the nuts characterized in that a fitting recessed part (25) of circular shape in plane view is provided in one nut (20) around a screw hole (23) allowing the bolt (50) to be screwed thereinto, a fitting projected part (35) to be fitted to the fitting recessed part (25) is provided on the other nut (30) around a screw hole (33) allowing the bolt (50) to be screwed thereinto, and a fitting axis (41) as the center axis of a fitting part (45) formed by fitting the fitting recessed part (25) onto the fitting projected part (35) and screw holes (40) and (40) as the center axes of the screw holes in one and the other nuts are provided at positions eccentrically by a same amount from the fitting axis (41).

Description

Description Nut for preventing loosening and tightening structure for preventing loosening using the nut

The present invention relates to a locking nut which is screwed to a bolt and a locking structure using the nut. Background art

Conventionally, tightening structures that use a combination of double nuts and bolts to prevent loosening and tightening have been used in various situations such as buildings and machinery. A double nut is made up of a combination of two nuts, and is tightened by using two nuts to prevent loosening. However, with such a structure, it was not possible to maintain a sufficient locking effect due to the effects of vibration, etc. and prolonged use.

On the other hand, there is a fastener disclosed in Japanese Unexamined Patent Publication No. 9-280239. This is a combination of one set of nuts that is screwed into the port. The fitting part of one nut has its axis aligned with the screw hole center, but the fitting part of the other nut Is arranged such that the shaft center is eccentric with respect to the screw hole center. In the above-described loosening prevention with the structure of Japanese Patent Application Laid-Open No. 9-28080, after connecting the screw holes of the upper and lower nuts to each other and screwing them together with the port, it is necessary to completely fit the mating parts of each other. Only for the deviation of the shaft center. For this reason, the work required more force than before, and if the tightening force was insufficient, a gap was created between the bolt and the upper and lower nuts, and contaminants and other foreign matter could easily get loose.

In addition, forcibly screwing a set of nuts into the port, deforming the bolt-to-clamped body resulted in poor durability.

In this way, it was still difficult to say that the structure was sufficient to prevent long-term use. Accordingly, an object of the present invention is to provide a lock nut and a lock structure using the nut, which have a simple structure and can be easily and securely locked. Disclosure of the invention

The present invention has the following configuration to achieve the above object. That is, the present invention provides a set of locking nuts used in combination with a port. One of the nuts is provided with a fitting recess having a circular planar shape around a screw hole into which the port is screwed. ,

The other nut is provided with a fitting protrusion fitted around the fitting recess around the screw hole into which the bolt is screwed, and the fitting fitting the fitting recess and the fitting protrusion is provided. A fitting shaft, which is a central axis of the mating portion, and a screw hole shaft, which is a central axis of the one and the other screw holes, are respectively provided eccentrically from the fitting shaft. . Thus, a locking nut having a strong tightening force can be provided.

Further, the present invention provides the above-mentioned one and the other nuts in a state where the fitting concave portion and the fitting convex portion are fitted to each other and the screw hole axes of the one and the other nuts are aligned. The positions of the outer surfaces of the nuts are substantially the same. As a result, it is possible to form one nut shape with one set of nuts, and it is possible to easily screw the nut onto the port even though the fitting shaft is eccentric.

In addition, a locking groove is provided at a position facing the inner surface of the fitting concave portion and the outer surface of the fitting convex portion, and a locking member is engaged with the locking groove, and the one and the other nuts are fitted. It is characterized in that it is rotatable with each other and is prevented from coming off in this state, so that one set of nuts is always integrated, and handling becomes convenient. Further, a mark for identifying a state where the respective screw hole axes coincide with each other when the one and the other nuts are fitted is provided. This makes it possible to easily screw into the bolt.

In addition, as the locking structure using the locking nut, the fitting concave portion and the fitting convex portion are fitted to each other and screwed to a bolt to form a locking nut. After the member to be tightened is further tightened, the locking nuts are further rotated in opposite directions to each other to be tightened and fixed. This makes it possible to form a locking structure that efficiently utilizes the locking nut of the present invention.

Also, after tightening the member to be tightened with the locking nut, only one of the other nuts, which is farthest from the bolt head, is turned in the tightening direction and tightened. A structure can be formed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a sectional view showing a use state of a locking nut according to the present invention, and FIG. 2 is a sectional view and a plan view showing a structure of the locking nut according to the present invention. And FIG. 3B is a cross-sectional view when the lock nut according to the present invention is fitted, and FIG. 4 is a cross-sectional view showing another embodiment of the lock nut according to the present invention. FIG. 5 is an explanatory diagram for explaining a test method using a high-speed screw looseness tester. '' Best mode for carrying out the invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a sectional view showing a use state of a locking nut 10 according to the present invention. The locking nut 10 is composed of an upper nut 20 and a lower nut 30 as a set of nuts to be used in combination, and the tightened member 70 through which the port 50 penetrates and is fixed is a bolt head. It is used by being screwed into the bolt 50 so as to be sandwiched. Here, the upper nut 20 is located farther from the bolt head and the lower nut 30 is located closer to the bolt head in use.

The port 50 is a hexagonal port, and the upper nut 20 and the lower nut 30 are composed of hexagon nuts having the same cross-sectional shape of the main body and the same regular hexagonal size. Regarding the thickness, the lower nut 30 is formed thinner than the upper nut 20. Fig. 2 shows the upper nut 20 and the lower nut 30 shown in Fig. 1, respectively. It is sectional drawing and a top view which show the positional relationship and shape of a fitting hole and a fitting part.

The bolt 50 is a triangular screw bolt, and the upper nut 20 and the lower nut 30 have threaded holes 23, 33, respectively, so that they can be screwed into the port 50. It has a shape.

Here, 40 denotes a screw hole axis which is the center axis of the screw holes 23 and 33, and coincides with the center axes of the upper nut 20 and the lower nut 30 respectively. The upper nut 20 is provided with a fitting concave portion 25 and the lower nut 30 is provided with a fitting convex portion 35 so as to be fitted to each other up and down to form a fitting portion 45. The fitting protrusion 35 is formed in a cylindrical shape around the screw hole 33, and the fitting recess 25 is circular around the screw hole 23 so as to be fitted to the fitting protrusion 35. It is formed by engraving. The screw holes 23 and 33 are provided so as to penetrate the fitting portion 45 up and down.

4 1 is a fitting shaft which is a central axis of the fitting concave portion 25 and the fitting convex portion 35, and is formed at a position eccentric from the center axis of the main body, that is, the screw hole shaft 40 by a. The directions of eccentricity of the nut 20 and the lower nut 30 with respect to the respective regular hexagons are the same. According to this configuration, when the fitting concave portion 25 and the fitting convex portion 35 are fitted together, and the screw hole shafts 40 are aligned with each other so that the screw holes 2 3 and 3 3 are completely penetrated up and down, The upper nut 20 and the lower nut 30 each have six main body outer surfaces 28, 38 substantially vertically aligned and aligned to form a hexagonal nut in a combined state.

Next, how to use the locking nut 10 having such a configuration will be described.

First, fit the upper nut 20 and the lower nut 30 together. This state is as shown in Fig. 3A. The screw hole shafts 40 and 40 do not match just by fitting up and down, and the screw holes 2 and 3 3 are shifted and not completely communicated up and down. . Therefore, the screw hole shafts 40 are aligned so that the screw holes 23 and 33 are completely penetrated so that the port 50 can be screwed by rotating about the fitting shaft 41. This is shown in Figure 3B. As a method of aligning the screw hole shafts 40, a method of adjusting the screw holes 23, 33 while looking at them may be used, or the outer surface 28, 38 of the main body may be vertically A method of adjusting the positions of the nuts so that they are aligned may be used. As described above, in the locking nut of the present embodiment, if the outer surfaces 28 and 38 of the main body are aligned, the screw hole shafts 40 and 40 are naturally aligned.

In the state shown in Fig. 3B, one hexagonal nut shape is used as the locking nut 10 so that the port 50 is screwed together with the tightened member 70 in the integrated state, like a normal nut. I will do it. And after teeth soaked tightened, or _c cinching by an upper nut 2 0 and the lower nut 3 0 is rotated in reverse to each other, cinching further turning in the tightening direction only upper nut 2 0. As described above, when the upper nut 20 and the lower nut 30 are rotated in opposite directions, or only the upper nut 20 is further rotated in the tightening direction and tightened, the fitting shaft 41 becomes the screw hole shaft 40. The screw holes 23 and 33 shift to the state shown in Fig.3A because they are eccentric with respect to Fig.3A. It will be stopped. With this tightening method, there is no gap between the nuts and the Porto 50, even though the Porto 50 is not as strained as the conventional example.Therefore, there is no intrusion of dirt, etc. The locking effect can be maintained over a long period of time.

Next, the state of loosening when vibration was applied was tested by tightening and fixing using the locking nut according to the present invention, and the results will be described.

For the test, a high-speed screw loosening tester as shown in Fig. 5 was used. The vibration conditions were a frequency of 178 rpm, a vibration stroke of 11 mm, an impact stroke of 19 mm, and a vibration direction perpendicular to the port axis.The looseness was judged by the combination of a pusher, locking nut, and port. Judge as loose when the mark is shifted. The upper nut 20 and the lower nut 30 were tightened together with a spanner, and then only the upper nut 20 was tightened with a spanner.

Vibration was given for 17 minutes, but there was no loosening. When the torque was measured, the tightening torque was 30 (lower nut) + 30 (upper nut) N · m, and the return torque was 23.7 ( Lower nut) + 40.8 (Upper nut) Nm Thus, it was found that the tightening structure was formed well, and that the caulking force was generated by the vibration.

The preferred embodiment according to the present invention has been described above. However, the present invention is not limited to this, and various design changes can be made.

The bolt 50, the upper nut 20 and the lower nut 30 are hexagonal ports and hexagonal nuts, but are not limited to these, and these basic shapes, such as thread, pitch, diameter, etc., have been variously changed in design. Is what is done. .

The fitting portion 45 is not limited either, and the fitting concave portion and the fitting convex portion may be formed on either the upper nut 20 or the lower nut 30. Regarding the shape, the fitting projection 35 may be provided on the truncated cone, and the fitting recess 25 may be formed so that the inner surface 26 extends outward from the lower part of the screw hole 23. good. In any case, the screw hole 33 is formed on the circular protruding tip surface 34 of the fitting convex portion 35, and the screw hole 23 is formed on the circular bottom surface 24 of the fitting concave portion 25. Regarding the thickness of the nut, the upper nut 20 was formed to be thicker than the lower nut 30.However, it is designed variously in consideration of the relationship with the tightening tool such as a spanner or the operation method. .

In the above-mentioned embodiment, after fitting, the upper nut 20 and the lower nut 30 each have six main body outer peripheral surfaces 28, 38 aligned vertically so that one hexagon nut At the same time as the shape, the screw holes 23 and 33 are completely connected vertically. In other words, when the screw holes 2 3 and 3 3 are completely communicated vertically, it is not necessary to adjust them while looking at the small and hard to see screw holes 2 3 and 3 3. It can be easily screwed into Porto 50 even if you are searching for it.

Therefore, an embodiment pursuing further convenience is shown in FIG. 4 described below. A locking groove 27 and a locking groove 37 are arranged on the inner surface 26 of the fitting concave portion and the outer surface 36 of the fitting convex portion so as to face each other when they are fitted. I do. Then, a wire 60 serving as a locking member is fitted into the hole to prevent it from coming off, and the two are fitted together as shown in FIG. In this case, the upper nut 20 and the lower nut 30 rotate around the fitting shaft 41, but in the fitted state. It will not come off. Therefore, mark the outer surface 28, 38 of the main body so that the screw hole 23 and the screw hole 33 communicate completely up and down, and the screw hole shaft 40 can be identified when they are aligned. . For example, in Fig. 4, with the screw holes aligned, cuts were made on each side to connect vertically, and marks 29 and 39 were made.

In the case of this embodiment, when using, first, the marks 29, 39 are aligned vertically while rotating the upper nut 20 and the lower nut 30 around the fitting shaft 41. In this state, the screw hole axes 40 of each other are matched. Then, while maintaining that state, insert it into Porto 50 and screw it in. Finally, rotate upper nut 20 and lower nut 30 by rotating them in opposite directions to each other, or firmly tighten only upper nut 20. By tightening, it can be used to prevent loosening.

According to this, the upper nut 20 and the lower nut 30 are integrated by being fitted and prevented from coming off, and since the marks 29, 39 are provided, the screw holes 23, 3 are provided. It is easy to match 3 up and down. Furthermore, the unification can save not only the trouble of adjusting both numbers but also the loss of one of them.

Also, if the shapes of the marks 29 and 39 are attached so that they can be easily distinguished by touch, it is possible to easily fit them into the Porto 50 even when working in a dark place or groping. . In this case, the outer diameter of the main body of the upper nut 20 and the lower nut 30 may be different. The invention's effect

According to the locking nut and the locking structure using the locking nut of the present invention, the bolt can be tightened with a simple configuration, and the durable locking can be reliably performed for a long period of time.

Further, since the structure is simple, the loosening is easily prevented, and the working efficiency is improved.

Claims

The scope of the claims

1. A set of locking nuts to be used in combination with a porto, and one of the nuts is provided with a fitting recess having a circular planar shape around a screw hole into which the bolt is screwed,

The other nut is provided with a fitting projection fitted around the fitting recess around the screw hole into which the port is screwed,

A fitting shaft that is a central axis of a fitting portion in which the fitting concave portion and the fitting convex portion are fitted, and a screw hole shaft that is a central axis of the one and other screw holes, A locking nut characterized in that each nut is provided with the same amount of eccentricity.

2. The locking nut according to claim 1 is screwed into the port by fitting the fitting concave portion and the fitting convex portion, and after the member to be tightened is tightened with the locking nut, the locking nut is further locked. A locking structure that locks the nuts by rotating them in opposite directions and tightening them.

3. The locking nut according to claim 1 is screwed into the port by fitting the fitting concave portion and the fitting convex portion, and after tightening the member to be tightened with the locking nut, A locking structure in which only one of the nuts, which is farthest from the head of the port, is turned in the tightening direction and tightened.

4. The locking nut according to claim 1, wherein when the one and the other nuts are fitted together, a mark for identifying a state where the respective screw hole axes are aligned is provided.

5. A locking groove is provided at a position opposing the inner surface of the fitting concave portion and the outer surface of the fitting convex portion, and a locking member is engaged with the locking groove.

2. The locking nut according to claim 1, wherein the one and the other nuts are fitted to each other so as to be rotatable and prevented from falling off.

6. The locking nut according to claim 5 is screwed into the bolt by fitting the fitting concave portion and the fitting convex portion, and after tightening the member to be tightened with the locking nut, the locking nut is further locked. Turn the nuts in opposite directions to each other to tighten The tightening structure that prevents loosening.

7. The locking nut according to claim 5, wherein the fitting concave portion and the fitting convex portion are fitted to each other, screwed into the port, and the member to be tightened is tightened with the locking nut. And the other nut, which is farthest from the Porto head, is tightened by turning it in the tightening direction.

8. The one and the other nuts are fitted with the fitting recesses and the fitting notches, and the screw holes of the one and the other nuts are aligned with each other. 2. The locking nut according to claim 1, wherein the positions of the outer surface of the main body are substantially the same.

9. The locking nut according to claim 8 is screwed into the port by fitting the fitting concave portion and the fitting convex portion, and after tightening the member to be tightened with the locking nut, Of the one and the other nuts, only the nut farthest from the bolt head is turned in the tightening direction and fixed by tightening.

10. A locking groove is provided at a position opposing the inner surface of the fitting concave portion and the outer surface of the fitting convex portion, and a locking member is engaged with the locking groove.

9. The locking nut according to claim 8, wherein said one and said other nuts are fitted to each other so as to be rotatable and prevented from falling off.