JP2006064141A - Seal washer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal washer having usability and repeatedly usable. <P>SOLUTION: Peripheral grooves 3 and 4 along the periphery of a bolt hole are formed in both upper and lower surfaces of a washer body 1 having the bolt hole 2 at its center. Ring-shaped seal materials 5 and 6 higher than the depths of the peripheral grooves are fitted into the peripheral grooves. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a seal washer having a sealing function.

As this type of seal washer, there is one in which a ring-shaped sealing material protruding from the upper and lower surfaces of the washer body is installed in the bolt hole of the washer body. it can.

The first seal washer is a ring-shaped seal material that is fitted into the bolt hole of the washer body by pushing in, and the second seal washer forms a circumferential groove on the outer circumferential surface of the ring-shaped seal material in the diametrical direction. The circumferential groove is attached to the periphery of the bolt hole of the washer body by an engagement method.

Japanese Patent Publication No. 50-29102 Japanese Utility Model Publication No. 63-123818 Japanese Utility Model Publication No. 34-1414 Japanese Utility Model Publication No. 4-14809

However, in the first conventional example, when the ring-shaped sealing material is compressed from above and below by bolt tightening, the portion protruding from the upper and lower surfaces of the washer body fills the gap between the bolt and the bolt hole. In addition, the sealing performance is ensured in the excess portion. Therefore, it is necessary to select a ring-shaped sealing material having an inner diameter that is almost the same size as the outer diameter of the bolt, or a ring-shaped sealing material having a thickness in consideration of the size of the gap. is there.

On the other hand, in the second conventional example, the above-mentioned problems are solved, but when the nut is excessively tightened, the upper and lower portions of the circumferential groove projecting from the upper and lower surfaces of the washer body. The seal material is crushed between the upper surface of the periphery of the bolt hole, the lower surface of the head of the bolt, the lower surface of the periphery of the bolt hole, and the upper surface of the mounting member.

As a result, when the sealing effect by the seal washer is impaired, there is a problem that it cannot be used repeatedly. The present invention has been made to solve the conventional problems as described above, and an object of the present invention is to provide a seal washer that is versatile and can be used repeatedly.

In order to achieve the above object, according to the first invention of the present application, when a circumferential groove along the periphery of the bolt hole is formed on both upper and lower surfaces of the washer body having a bolt hole in the center, A ring-shaped sealing material higher than the depth is mounted on each. Furthermore, in order to achieve the above object, the second invention of the present application is characterized in that the sealing material mounted in the circumferential groove is compressed and deformed to the same level as the upper surface or the lower surface of the washer body, It was set as the structure which has a clearance gap between the outer periphery of the deformed sealing material, and the inner periphery of the said circumferential groove.

With the configuration of the first invention, the upper ring-shaped sealing material is sealed between the lower surface of the bolt head and the washer body, and the lower ring-shaped sealing material is sealed between the washer body and the mounting member. Is done. Therefore, it is surely sealed on both the upper and lower surfaces of the washer body without being influenced by the inner diameter of the bolt hole and the outer diameter of the bolt inserted into the bolt hole.

Even when the bolts are tightened excessively, the lower face of the bolt head and the washer body are in the upper ring-shaped sealing material, and the washer body and the mounting member are in the lower ring-shaped sealing material. By doing so, no further tightening is performed. Therefore, there is no fear that the ring-shaped sealing material is crushed beyond the elastic limit, and it can be used repeatedly.

In addition to the above-described effect that, even when the nut is excessively tightened by the configuration of the second invention, the ring is sealed by the restoring force of the ring-shaped sealing material in addition to the above-described effect that it is not crushed beyond the elastic limit. The contact area with the lower surface of the head of the bolt that presses the sealing material and the mounting member is reduced, and a high sealing effect can be obtained by contacting with a high contact pressure.

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. In the figure, A is a seal washer according to the present invention, a circular plain washer body 1 having a bolt hole 2 in the center, and the plain washer body 1
And a pair of upper and lower circumferential grooves 3 and 4 formed on the upper and lower surfaces, and a pair of upper and lower ring-shaped sealing members 5 and 6 mounted in the circumferential grooves 3 and 4, respectively.

The circumferential grooves 3 and 4 are annular concave grooves respectively formed along the periphery of the bolt hole 2 formed at the center of the seal washer 1 and have a width w of 5 mm. The cross section with a depth of 1 mm is a trapezoidal cross section, and each of the circumferential grooves 3 and 4 has a substantially semicircular cross section formed by the arc portions 5a and 6a and the flat portions 5b and 6b. The ring-shaped sealing materials 5 and 6 are mounted on the bottom portions 3a and 4a of the circumferential grooves 3 and 4 by baking or bonding or the like at the flat portions 5b and 6b, respectively.

The ring-shaped sealing materials 5 and 6 are made of, for example, butyl rubber, the width W of the flat portions 5b and 6b is set to 3 mm, which is smaller than the width w of the circumferential grooves 3 and 4, and the total height H is the circumference. The depth is larger than the depth h of the grooves 3 and 4 by 2 mm. Therefore, in the normal state, the ring-shaped sealing members 5 and 6 have upper and lower arc portions 5a and 6a projecting from the upper and lower surfaces of the flat washer main body 1 by 1 mm, respectively. A gap S is formed between the ring-shaped sealing materials 5 and 6 located inside and the circumferential grooves 3 and 4.

FIG. 5 shows a use state of the seal washer according to the present invention.
When the seal washer A is placed on 7B, and the bolt 8 is inserted into the bolt hole of the mounting member 7A, 7B that is aligned with the bolt hole 2 through the seal washer A, the lower side mounting A nut 9 is screwed onto the tip of the bolt 8 protruding from the lower surface of the member 7B.

Therefore, by tightening the nut 9 from the state shown in FIG. 5, the upper ring-shaped sealing material 5 is also formed between the lower surface of the head 8 a of the bolt 8 and the upper surface of the flat washer body 1, and the flat washer body 1. Between the lower surface and the upper surface of the upper mounting member 7A, the lower ring-shaped sealing material 6 is compressed from above and below, respectively, and as shown in FIG. The portions 5a and 6a are in close contact with each other and sealed.

FIG. 7 is a view showing a state in which the nut 9 is excessively tightened. In other words, the nut 9 may be excessively tightened at the time of connection by tightening the bolt 8 and the nut 9, but even in this case, each of the seal surfaces (5a, 6a) of the ring-shaped sealing materials 5, 6 is pressed. Until the members 8a and 7A come into contact with the upper and lower surfaces of the flat washer body 1, respectively (maximum),
The nut 9 cannot be tightened beyond that. Therefore, the pair of upper and lower ring-shaped sealing materials 5 and 6 are compressed to the elastic limit or more, and the sealing effect is not lost and the sealing effect is lost.

Even when the pair of upper and lower ring-shaped sealing materials 5 and 6 are compressed to the maximum within the above range, the outer periphery of the deformed ring-shaped sealing materials 5 and 6 and the circumferential grooves 3 and 4 By adopting a structure having a gap s between the inner periphery and the inner periphery, the ring-shaped sealing materials 5 and 6 have a sufficient restorative force. This can be achieved by taking into consideration the selection of the material in consideration of the elastic modulus of the sealing material, the thickness of the sealing material and the size of the circumferential groove, the height of the sealing material and the depth of the circumferential groove, and the like.

Accordingly, the contact area between the sealing surfaces (the compressed arc portions 5a and 6a) and the members 8a and 7A can be kept small by the restoring force of the ring-shaped sealing materials 5 and 6. As a result, the force per unit area is increased even with the same restoring force, so that high contact pressure and high sealing performance are ensured.

Sectional drawing of the seal washer which shows embodiment of this invention Sectional enlarged partial view of the seal washer Top view of the seal washer Overall perspective view of the seal washer Sectional view showing the usage state of the seal washer Cross-sectional view of action during tightening Cross-sectional view of action when tightened excessively

Explanation of symbols

A Seal washer 1 Plain washer body 2 Bolt hole 3, 4 Circumferential groove 3a, 4a Same bottom part 5,6 Ring-shaped sealing material 5a, 6a Same arc part 5b, 6b Same plane part

Claims (2)

When a circumferential groove along the periphery of the bolt hole is formed on both the upper and lower surfaces of the washer body having a bolt hole in the center, a ring-shaped sealing material higher than the depth is mounted in the circumferential groove. Seal washer characterized by. The sealing material mounted in the circumferential groove is compressed and deformed to the same level as the upper surface or the lower surface of the washer body, and between the outer periphery of the deformed sealing material and the inner periphery of the circumferential groove. The seal washer according to claim 1, wherein the seal washer has a gap.

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