JPH09291925A - Seal washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal washer to improve sealing ability while mounting the washer on a screw member such as body is facilitated. SOLUTION: A seal washer comprises a washer bolt 10 and a seal member 20 arranged in a seal member containing space 14 formed in the washer body 10. The washer body 10 has a disc part 12 in which a hole 11 is formed and a cylindrical part 13. The seal member 20 comprises a first annular part 21, and a second annular part 22 connected to the first annular part 21 through an inner peripheral part 23, the seal member being formed in an elastic member, such as rubber. In a state to fasten a bolt, the inner peripheral part 23 having an inside diameter contracted and displaced is pressed against the screw surface of the bolt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal washer used for screwing a member to be fastened with a screw member such as a bolt.

[0002]

2. Description of the Related Art Washers are attached to bolts when it is necessary to prevent loosening of screw members such as bolts. A seal member is provided in the case where a member to be fastened is screwed by using a bolt and fluid such as water, oil, or air may leak from between the bolt and the member to be fastened. A seal washer or seal washer is attached to the bolt.

As such a seal washer, there is a conventional one as disclosed in Japanese Utility Model Laid-Open No. 61-168314. The washer has a metal disk-shaped washer, an elastic ring fixed to the back side of the washer, and a hard elastic body having a U-shaped cross section that covers the elastic ring.

[0004]

Even if the bolt to which the seal washer having such a structure is attached is screwed to the member to be fastened, the fluid may leak from the threaded surface of the bolt. It is considered that the reason is that the seal member made of the elastic material may not sufficiently enter into the valleys between the threads formed on the bolt. Therefore,
If the inner diameter of the hole for bolt penetration formed in the seal member is made small so that the seal member sufficiently enters into the thread trough of the bolt when tightening the bolt, the operation of attaching the seal washer to the bolt can be performed easily. It turned out to be difficult.

Therefore, in order to facilitate the work of attaching the seal washer to the bolt, the inner diameter of the bolt through hole formed in the seal member must be increased, and the sealing performance at the time of fastening is improved. In order to do this, it is necessary to reduce this inner diameter.

An object of the present invention is to provide a seal washer capable of improving sealing performance while facilitating attachment to a screw member such as a bolt.

[0007] The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0008]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows.

That is, the seal washer of the present invention is
A washer body having a disk portion in which a hole for threading a screw member is formed and a tubular portion that is integral with the disk portion, a first annular portion, and a second annular portion connected to the first annular portion via an inner peripheral portion. The seal member is provided with an annular portion and is formed of an elastic member such as rubber and is arranged in the seal member accommodation space, and the inner peripheral portion of the seal member is enlarged when the screw member is not fastened. When the screw member is displaced and the screw member is fastened, the outer peripheral portions of the first annular portion and the second annular portion come close to each other and the inner peripheral portion is contracted and displaced to be pressed against the screw surface of the screw member. Is characterized by.

The inner peripheral surface of the seal member may be formed in an arcuate cross section, or both the front and back surfaces of each annular portion may be bulged in an arcuate shape. Further, a disc spring member may be embedded inside at least one of the first annular member and the second annular member. An integral disc spring member may be embedded in both the annular members and the inner peripheral portion.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

1 to 3 are views showing a seal washer which is an embodiment of the present invention. The seal washer is made of a metal washer body 10 made of stainless steel or the like and a nitrile rubber (NBR) or the like. The seal member 20 is made of an elastic member.

The washer body 10 has a disk portion 12 having a hole 11 through which a screw member penetrates at the center thereof, and a tubular portion 13 integrated with the outer peripheral portion thereof.
A seal member accommodating space 14 is formed on the inner side of 3 by the disk portion 12 and the tubular portion 13. The inner diameter of the hole 11 is set to be larger than the outer diameter of the screw portion of the bolt 30 as the screw member shown in FIG.

The seal member 20 has a first annular portion 21 and a second annular portion 22, and these annular portions 21 and 22 are connected to each other through their inner peripheral portions 23.
As shown in FIG. 1, the outer peripheral portions of the annular portions 21 and 22 are separated from each other when the axial pressing force is not applied to the outer peripheral portions of the annular portions 21 and 22, and the outer peripheral portions of the annular portions 21 and 22 are separated from each other by an angle θ.
And is inclined with respect to the disk portion 12. A hole 24 is formed by the inner peripheral portion 23, and a bolt 30 having a head portion 30a and a screw portion 30b passes through the hole 24. The inner peripheral surface of the hole 24 has an arcuate cross section as shown in FIG. 1 when the bolt 30 is not penetrated therein.

Both front and back end surfaces 25a, 25 of the first annular portion 21
Each of b is an arcuate surface that bulges outward in the axial direction, and both front and back end surfaces 26a and 26b of the second annular portion 22 are formed.
Also each have an arcuate surface protruding outward in the axial direction. Since the respective annular portions 21 and 22 have the same shape as each other and have the symmetrical shape, the seal member 20 may be incorporated in the seal member accommodating space 14 of the washer body 10 with whichever side is the upper side. You can

FIG. 1 is a view showing a state in which the seal member 20 is incorporated in the seal member accommodating space 14 of the washer body 10. At this time, the inner diameter of the hole 24 of the seal member 20 is the inner diameter of the hole 11 of the washer body 10. The diameters of the holes 11 and 24 are set so that they are substantially the same. In this state, the outer peripheral surface of the first annular portion 21, which is the upper side in FIG. 1, comes into contact with the inner surface of the tubular portion 13 of the washer body 10, so that the washer body 1
The seal member 20 is prevented from slipping out of the zero position. When incorporating the seal member 20 into the washer body 10,
Since the seal member 20 is vertically symmetrical, any of them may be placed on the upper side, and the assembling workability is improved.

In FIG. 2, the seal member 20 is accommodated as shown in FIG. 1, and the washer body 10 is pressed against the flat surface of the member 31 until the lower end surface of the washer body 10 comes into contact with the flat surface. It is a figure which shows a state. Member 31
When the seal member 20 is pressed in the axial direction between the washer body 10 and the washer body 10, the first annular portion 21 is pressed before pressing.
While the second annular portion 22 and the second annular portion 22 are inclined with respect to each other at a predetermined angle θ as shown in FIG. 1, as shown in FIG. When they are in close contact with each other, they are in a parallel state and each is in parallel with the disk portion 12.

The annular portion 2 thus inclined with respect to each other.
As the inner peripheral portion 23 of the seal member 20 is contracted and displaced radially inward as the 1 and 22 become parallel, the inner diameter of the hole of the inner peripheral portion 23 is small as shown in FIG. Becomes 2 shows a state where the bolt 30 does not penetrate, and a state where the bolt 30 penetrates is shown by a chain double-dashed line. As can be seen from the comparison between FIG. 1 and FIG. When the portions 21 and 22 are parallel to each other, the inner peripheral portion 23 of the seal member 20 is largely displaced radially inward. Therefore, when the seal member 20 is axially pressed as shown in FIG. 2 with the bottle 30 penetrating, the contracted and displaced portion surely comes into close contact with the screw portion 30b of the bolt 30.

FIG. 3 is a view showing a state in which a seal washer is attached to the bolt 30 and fastened to the fastened member 32. When the bolt 30 is fastened in this manner and the seal member 20 is axially pressed between the head portion 30a of the bolt 30 and the fastened member 32, the first annular portion 21 and the second annular portion 22 become the inner peripheral portion 23. Is bent about, and the outer peripheral portions of both annular portions 21 and 22 are in a parallel state in which they are in contact with each other.
As a result, the inner peripheral surface of the hole 24 of the inner peripheral portion 23 is contracted and displaced in the radial direction and enters the valley between the threads of the bolt 30. As shown in FIG. 3, this displacement amount is sufficient so that a part of the inner peripheral portion 23 of the seal member 20 is axially displaced and enters the hole 11 of the washer body 10,
Even if a fluid such as oil or water is present in the fastened member 32 and the pressure of the fluid is high, it is possible to reliably prevent the fluid from leaking from the gap between the bolt 30 and the screw hole of the fastened member 32. To do.

Further, since the seal member 20 is formed of an elastic member, it is accommodated in the seal member accommodation space 14
When compressed inside, the seal member 20 always urges a spring force in the direction of separating the washer body 10 and the fastened member 32, and this spring force surely prevents the bolt 30 from loosening.

Since both front and back end surfaces 25a, 25b, 26a, 26b of the respective annular portions 21, 22 are bulged in an arc shape, it is necessary to press the seal member 20 in the axial direction to crush these bulged portions. As a result, the respective arcuate portions are also displaced in the radial direction, increasing the contraction displacement of the inner peripheral surface.

FIGS. 4 and 5 are views showing a seal washer which is another embodiment of the present invention. In these figures, members common to the constituent members of the seal washer shown in FIGS. Are assigned the same reference numerals.

In this seal washer, a disc spring member 41 made of spring steel is embedded in one annular portion 22 of the seal member 20. This disc spring member 41
In the state in which the axial pressing force is not applied to the seal member 20 as shown in FIG. 4, is inclined corresponding to the inclination angle of the annular portion 22 and has a conical section. As described above, the disc spring member 41 is provided in the annular member 22.
By embedding, even if a large load such as an impact or a vibration from the outside is applied under the condition of use, it can be reliably absorbed.

In the illustrated case, the two annular parts 21, 2 are
Although the disc spring member 41 is embedded in one of the two, the disc spring member 41 may be embedded in both annular portions 21 and 22. In that case both annular parts 21,
The disc spring member embedded in 22 may be connected in the inner peripheral portion 23.

In the seal washer shown in FIGS. 4 and 5, the cross-sectional shape of the hole 24 and the front and rear end surfaces 25a to 26b are flat without arcuate bulging. As shown in, the cross-sectional shapes of these holes and end faces may be arcuate. Further, the cross-sectional shapes of the hole 24 and the front and rear end surfaces 25a to 26b of the seal washer shown in FIGS. 1 to 3 are shown in FIGS.
It may be flat as shown in FIG.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. Needless to say.

For example, in the illustrated case, the inner diameter of the hole 11 of the washer body 10 and the inner diameter of the hole 24 of the seal member 20 are substantially the same, but the inner diameters of the holes should be set so as to deviate from each other. You can Further, the annular portions 21 and 22 may have different thicknesses and may be asymmetrical to each other. Further, the disc spring member 41 may be made of hard resin.

[0028]

Advantageous effects obtained by typical ones of the inventions disclosed in the present application will be briefly described.
It is as follows.

(1). Since the inner diameter of the hole formed in the seal member and through which the screw member penetrates can be increased, the work of attaching the seal washer to the screw member becomes easy.

(2) Since the inner peripheral portion of the hole of the seal member is largely displaced in the radial direction, when the screw member is fastened, the seal member is pressed against the screw surface to form a screw thread and a screw thread. It surely enters the valley between them, and the sealing property is greatly improved.

(3) Therefore, even if the fluid pressure such as the hydraulic pressure in the fastened member is high, it is possible to reliably prevent the fluid from leaking between the screw member and the fastened member.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a seal washer according to an embodiment of the present invention is not fastened to a fastened member.

FIG. 2 is a cross-sectional view showing a state in which an axial pressing force is applied to the seal member of the seal washer shown in FIG.

FIG. 3 is a cross-sectional view showing a state in which a bolt is fastened to a fastened member using the seal washer shown in FIG.

FIG. 4 is a cross-sectional view showing a seal washer which is another embodiment of the present invention.

5 is a partially cutaway perspective view showing the seal member shown in FIG. 4. FIG.

[Explanation of symbols]

 10 Washer Main Body 11 Hole 12 Disk Part 13 Cylindrical Part 14 Sealing Member Housing Space 20 Sealing Member 21 First Annular Part 22 Second Annular Part 23 Inner Circumferential Part 24 Hole 30 Bolt (Screw Member) 32 Fastened Member 41 Disc Spring Member

Claims (3)

[Claims] 1. A washer body having a disk portion having a hole for passing through a screw member and a tubular portion integrated with the disk portion; a first annular portion; and an inner peripheral portion of the first annular portion. A second annular portion that is continuous with the second annular portion, and a seal member that is formed of an elastic member such as rubber and that is disposed in a seal member accommodation space that is formed by the disk portion and the tubular portion, When the screw member is not fastened, the inner peripheral portion of the seal member is expanded and displaced, and when the screw member is fastened, the outer peripheral portions of the first annular portion and the second annular portion are close to each other. A seal washer, wherein the inner peripheral portion is contracted and displaced so that the inner peripheral portion is pressed against the screw surface of the screw member. 2. The seal washer according to claim 1, wherein the inner peripheral surface has an arcuate cross section. 3. The seal washer according to claim 1 or 2, wherein a disc spring member is embedded inside at least one of the first annular member and the second annular member.