JPH08121454A - Spring washer - Google Patents

Abstract

PURPOSE: To provide a spring washer sufficiently displaying a function as the spring washer further to obviate the plain washer. CONSTITUTION: A spring washer is formed of a sheet of plate material provided with a bolt inserting hole 11 in the center also to provide a slit 13 from the inserting hole 11 over to an external edge 12 to be formed so as to provide a step difference in end parts 14, 14 of the plate material in both sides of the slit 13, to set ratio [M/L] of a diameter M of the inserting hole 11 relating to a diameter L of the plate material to a 0.1 to 0.9 range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spring washer, and more particularly, to a spring washer which fully functions as a spring washer and does not require a flat washer.

[0002]

2. Description of the Related Art Conventionally, a flat plate washer has been used to stably attach bolts and nuts when there is unevenness on the seat surface that is in contact with the bolt head or nut, or when the bolt hole is large and the seat surface is narrow. Was used. As shown in FIGS. 3 and 4, in addition to the plain washer 4, a spiral spring washer 5 is used to press the screw groove of the nut into the screw groove of the bolt to prevent loosening of the bolt and nut. Was also done.

The plain washer 4 alone cannot provide a bolt / nut loosening preventing effect, and the spring washer 5 alone cannot secure the bolt / nut stably because the seat surface is too small. Therefore, the plain washer 4 and the spring washer 5 are separately manufactured, and are used by being inserted into the bolt together with the nut when the bolt and the nut are screwed together. 3 and 4, the spring washer 5 is connected to the plain washer 4 by welding or the like in order to save the labor of separately inserting the plain washer 4 and the spring washer 5 into the bolts. It is of a different form.

[0004]

When the flat washer 4 and the spring washer 5 are used together as described above, the spring washer 5 is used as compared with the case where only the plain washer 4 is used.
However, there is a problem that extra raw materials are required and the cost increases. Further, when using them, the plain washer 4 and the spring washer 5 must be inserted into the bolts, respectively, as compared with the case where only the plain washer 4 (or only the spring washer 5) is used. There is also a problem that the mounting work is troublesome. The flat washer 4 and the spring washer 5 are shown in FIGS. 3 and 4.
However, instead of this, it takes time and effort to weld the spring washer 5 to the flat washer 4 in advance, and there is a problem that the cost increases accordingly.

Therefore, an object of the present invention is to provide a spring washer which fully exhibits the function as a spring washer and does not require a flat washer.

[0006]

According to the present invention, a bolt insertion hole is provided in the center, and a cut is provided from the insertion hole to the outer edge, and the end portions of the plate material on both sides of the cut are stepped. A ratio of the diameter M of the insertion hole to the diameter L of the plate material [M / L]
The above object is achieved by providing a spring washer characterized by a value of 0.1 to 0.9.

[0007]

According to the present invention, it is not necessary to use a plain washer and a spring washer together as in the conventional case, but one spring washer ensures the fastening with bolts and nuts, and
It is possible to prevent loosening of the nut.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a spring washer of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the outer appearance of a spring washer of this embodiment, and FIG. 2 is a side view when using the spring washer of this embodiment.

As shown in FIG. 1, the spring washer 1 of the present embodiment is provided with a bolt insertion hole 11 in the center and a cut line 13 extending from the insertion hole 11 to the outer edge 12. 13 is a circular plate material formed so that the end portions 14, 14 of the plate materials on both sides of 13 are stepped, and the ratio of the diameter M of the insertion hole 11 to the diameter L of the plate material [M
/L=12.5 mm / 45 mm] is about 0.28.

The spring washer 1 of this embodiment will be described in more detail. The spring washer 1 has a diameter L = 45 ± 0.5 mm,
The circular through hole 11 having a diameter M = 12.5 ± 0.2 mm is provided at the center of a circular plate material having a thickness T = 2.8 ± 0.16 mm, and the cut 13 is provided at the end portion. 14, 14 is a free height (the outer end surface of one end 14 and the other end 14
Distance from the back surface of the outer edge of H) [see FIG. 2 (a)] = 8.0
It is formed to have a step of ± 1.0 mm, the material is JIS G 4051 (carbon steel material for machine structure) S 58 C, and heat treated HRC 40 to 48 and surface treated dacrodized.

In using the spring washer 1 of this embodiment, as shown in FIG.
The bolt 2 through the bolt holes 41, 51 of the spring washer 1, and then the bolt 2 through the insertion hole 11 of the spring washer 1,
Finally, the nut 3 is screwed onto the bolt 2. The state in which the nut 3 is screwed into the bolt 2 and tightened is shown in FIG.
As shown in (b), even if the insertion hole 51 of the material 5 is large as shown in the figure, the spring washer 1 secures the seating surface of the nut 3 and the spring washer 1 has the original shape. The screwing groove of the bolt 2 is pressed against the screwing groove of the nut 3 by the elastic restoring force of the bolt 2 to increase the frictional resistance, and the bolt 2 and the nut 3 are prevented from loosening.

The plate thickness T and the free height H are usually selected so that the plate thickness and the free height H are the same as those of an ordinary spring washer corresponding to the diameter of the bolt inserted into the insertion hole 11. Ratio of the diameter M of the insertion hole 11 to L (M / L)
Is preferably in the range of 0.1 to 0.9, especially 0.2
It is more preferably in the range of to 0.6. The ratio (M
/ L) is less than 0.1, the insertion hole 11 is too small for the spring washer 1 as a whole, which is unnecessarily large as a bolt head or a bearing surface of a nut, and the material is wasted. When the bolts and nuts are screwed together, the elastic restoring force of the spring washer 1 becomes too strong, and even if the bolts and nuts are tightened, it is difficult to exert the effect as a spring washer. When the above ratio (M / L) exceeds 0.9, the spring washer 1
Since the insertion hole 11 is too large for the whole, the bolt head or the seat surface of the nut cannot be sufficiently secured, and the elastic restoring force of the spring washer 1 is too weak when the bolt and the nut are screwed, and the bolt
There is a fear that it will not be possible to effectively prevent the loosening of the nut.

The plate thickness T is preferably in the range of 0.9 mm to 25 mm, more preferably in the range of 2.3 mm to 16 mm. If the plate thickness T is less than 0.9 mm, the elastic restoring force of the spring washer 1 may be too weak when the bolts and nuts are screwed together, and the looseness of the bolts and nuts may not be effectively prevented. If it exceeds, the elastic restoring force of the spring washer 1 becomes too strong when the bolts and nuts are screwed together, and even if the bolts and nuts are tightened, it is difficult to exert the effect as a spring washer. In the construction field, it is best that the thickness T is about 4.5 mm.

The spring washer 1 of this embodiment is constructed as described above, and the spring washer 1 alone serves as a conventional flat washer and spring washer.
Without having to manufacture each separately,
You can prevent loosening of nuts and save raw materials,
Also, without separately inserting each into the bolt and pre-welding the flat washer and the spring washer,
It has excellent workability.

The spring washer of the present invention is not limited to the above embodiment, and the shape may be a quadrangle or a polygon instead of a circle, but a regular polygon is preferable as a shape other than the circle, and a single plate material is used. Diameter L and diameter M of the insertion hole 11
Can be arbitrarily determined so that the ratio of the diameter M to the diameter L (M / L) is within the above range. When the spring washer of the present invention has a shape other than circular, the diameter L is the same as that of the insertion hole 1 described above.
It is the average length of the diameter passing through the center of 1. Further, in the above embodiment, the spring washer of the present invention is arranged between the material to be fastened and the nut, but it may be arranged between the material to be fastened and the bolt head, such as bolt holes. It should be placed in an appropriate place because of the relationship.

[0016]

According to the present invention, the function as a spring washer is fully exerted and a plain washer is not required, that is, the spring washer of the present invention also serves as a conventional plain washer and a spring washer. It is possible to prevent loosening of bolts and nuts, save raw materials, and have excellent workability.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of an embodiment of a spring washer of the present invention.

FIG. 2 is a side view when using an embodiment of the spring washer of the present invention, (a) showing a state before screwing the bolt and nut, and (b) showing a state after screwing the bolt and nut.

FIG. 3 is a perspective view showing a state in which a conventional plain washer and a spring washer are combined.

FIG. 4 is a perspective view showing a state in which a conventional plain washer and a spring washer are combined, which is different from that shown in FIG.

[Explanation of symbols]

 1 Spring washer 2 Bolt 3 Nut

Claims (2)

[Claims] 1. A sheet of a sheet having a bolt insertion hole formed in the center thereof, a cut extending from the insertion hole to an outer edge of the plate, and a step formed at each end of the plate material on both sides of the cut. A spring washer made of a plate material, wherein the ratio [M / L] of the diameter M of the insertion hole to the diameter L of the plate material is in the range of 0.1 to 0.9. 2. The spring washer according to claim 1, wherein the plate material has a thickness within a range of 0.9 mm to 25 mm.