JPH0618762U - gasket - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a gasket that can cope with a large error in the depth dimension of the groove in which the gasket is mounted. [Structure] An annular gasket 1 is mounted in a groove 4 formed in one member 3. The gasket 1 has an annular seal portion 2 formed by gradually reducing the thickness from the center portion toward both end surface sides. The inner peripheral surface of the gasket 1 is formed parallel to the axis. When the gasket 1 is mounted in the groove 4, the gasket 1 is pressed by both members and compressed. At this time, in the gasket 1, the central portion thereof is bent and the seal portion 2 is bent inward, so that the width of the gasket 1 is reduced as a whole. As a result, the gasket 1 flexibly responds to the error in the depth dimension of the groove 4, and the sealability can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a gasket, and more particularly to a gasket that is provided between two members to seal the two members.

[0002]

[Prior art and its problems]

 Conventionally, so-called O-rings, square rings, etc. have been used as gaskets of this type. Then, by forming an annular groove in one of the two metallic members and mounting a gasket in this groove, the gasket comes to be interposed between the two members. Is sealed with a gasket.

In recent years, in order to reduce the weight of a member, the case where a resin or the like is used as a material of the member has been increasing. However, when the resin is used as described above, the processing accuracy is lower than that of a metal. Therefore, in particular, a large error may occur in the dimensional accuracy in the depth direction of the groove formed in one member.

When a large error exceeding the allowable range occurs in the depth dimension of the groove in this way, the distance between the bottom surface of the groove formed in one member and the facing surface of the other member is too large, Or, it may become too small, and the gasket may not have a predetermined crushing allowance, or on the contrary, the crushing allowance may be excessive.

Usually, when an O-ring or a square ring is used as the gasket, by setting a predetermined crushing allowance on the gasket, when the gasket is mounted in the groove so that the gasket is slightly compressed by two members, At this time, the elastic force generated in the gasket is used to obtain the sealing property against the mating member.

However, as described above, when the gasket does not have a predetermined crushing allowance, a gap is created between the gasket and the member to cause leakage, or when the crushing allowance is excessive. In this case, the gasket is over-compressed and cracks may occur, resulting in reduced sealability.

Therefore, a so-called lip type gasket has been considered as a measure against the above problem. In this case, when the groove formed in one member is small, the lip portion of the gasket is bent. Or, it may become wavy, and as a result, the sealability may not be secured.

Further, when the groove of one member is formed to be small, the overall size of the gasket is inevitably small, so that the formability of the gasket is also problematic.

This invention solves the above-mentioned problems, and can flexibly cope with a member using a material for which high processing accuracy is not expected, and can improve the sealing property, and at the same time, improve the moldability. The object is to provide a gasket that can

[0010]

[Means for solving problems]

 In order to solve the above problems, the present invention, as a first invention, is an annular gasket that seals between two members by mounting it in an annular groove formed in one of the two members. And has an annular seal part formed by gradually reducing the wall thickness from the center part toward both end faces, and one peripheral surface is formed parallel to the axis line. It has a configuration in which the central part can be bent when mounted. A second invention is an annular gasket that seals between two members by mounting it in an annular groove formed in one of the two members, and has a central portion from both end surfaces. It has an annular seal part that gradually decreases in thickness toward the center, and an annular recess is formed in the center part of one peripheral surface, so that the center part can be bent when mounted in the groove. It has a configuration as described below. As a third invention, an annular gasket that seals between two members by mounting it in a groove formed in one of the two members, and has a wall thickness toward one end surface thereof. It has an annular seal part formed by gradually reducing the thickness, one peripheral surface is formed parallel to the axis, and an annular fixing part that can abut the groove is formed on the other end face side. Thus, the root portion of the seal portion can be bent when it is mounted in the groove.

[0011]

[Action]

 By adopting the above-mentioned means, this invention can flexibly cope with the case where there is a large error in the depth dimension of the groove formed in one member.

That is, in the first and second inventions, since the central portion of the gasket is bendable, when the gasket is mounted in the groove formed in one member, the central portion of the gasket is By bending the portions, the seal portions formed on both end surfaces of the gasket are deformed so as to come close to each other.

That is, when the gasket is mounted in the groove, it is pressed by both members and is compressed in the axial direction. At this time, the width of the gasket is changed to the depth of the groove depending on the bending angle of the central portion of the gasket. The size can be freely reduced according to.

Further, in the third invention, since the base portion of the seal portion is bendable, when the gasket is mounted in the groove, the base portion of the seal portion is bent, so that the gasket The width of the can be freely reduced according to the depth of the groove.

Therefore, even if a material such as resin that is not expected to have high processing accuracy is used as the material of the member, the crushing margin cannot be taken or the gasket is not cracked, and the material is flexible. In addition, it is possible to improve the sealing performance as a result.

Further, in this invention, since the shape of the gasket is very simple, it is possible to simplify the structure of the molding die for molding the gasket. As a result, the molding of the gasket is performed. It will be very good.

[0017]

【Example】

 Embodiments of the present invention shown in the drawings will be described below.

FIG. 1 is a view showing a first embodiment of a gasket according to the present invention, and FIG. 2 is a view showing a state in which the gasket shown in FIG. 1 is arranged in a groove formed in one member, 3 and 4 are views showing a state in which the gasket shown in FIG. 1 is provided between members. That is, the gasket 1 shown in FIGS. 1 to 4 is made of an annular rubber-like elastic body, and has an annular seal portion formed by gradually reducing the thickness from the central portion toward both end faces. 2, and the inner peripheral surface is formed parallel to the axis.

When the gasket 1 is mounted in the groove 4 formed in the one member 3, the gasket 1 is interposed between the one member 3 and the other member 5 in a state where the central portion of the gasket 1 is bent. The two members are then sealed.

In FIG. 1, a gasket 1 is made of a rubber-like elastic body having a good sealing property and has a ring shape as a whole. At this time, the inner peripheral surface is formed so as to be parallel to the axis. ing.

On both end surfaces of this gasket 1, there are annular seal portions 2 that can come into contact with a mating member. The seal portion 2 is formed by gradually reducing the wall thickness from the central portion of the gasket 1 toward both end surfaces, so that the overall cross-sectional shape of the gasket 1 is an isosceles triangle. Is formed.

At this time, the gasket 1 is formed so that the central portion on the outer peripheral side thereof becomes the apex portion 1a, and the distance h from the apex portion 1a to the end face is set to be 1/2 of the width H of the gasket 1. (H = H / 2), and it is preferable that the interior angle θ of the apex 1a is set to about 100 to 160 °.

The gasket 1 configured as described above is mounted in the groove 4 formed in one of the two members 3, as shown in FIGS. 2 to 4.

In FIGS. 2 to 4, one member 3 is, for example, a housing or a casing in which a recess opening on the end face side is formed, or a tubular member, and the like. An annular groove 4 is formed so as to surround the opening of the internal space. At this time, the depth of the groove 4 is set to be smaller than the width H of the gasket 1.

The other member 5 is, for example, a lid member that closes a recess formed in the one member 3, or a tubular member that can be connected to the one member 3.

Then, as shown in FIG. 2, after the gasket 1 is arranged in the groove 4 of the one member 3, the other member 5 is provided with its end face facing the end face of the one member 3, The gasket 1 is arranged so as to be compressed by the material. At this time, the seal portions 2 formed on both end surface sides of the gasket 1 are in contact with the mating members.

Next, the operation of the above will be described.

By mounting the gasket 1 in the groove 4 of the one member 3 as described above, the gasket 1 comes to be interposed between the one member 3 and the other member 5. Then, the gap between the one member 3 and the other member 5 is sealed by the gasket 1, and the inside of the member is sealed.

First, the gasket 1 is arranged in the groove 4 of the one member 3, and then the gasket 1 is inserted between the one member 3 and the other member 5 with the gasket 1 interposed therebetween. When the gut 1 is pressed within a predetermined squeezing allowance, the gasket 1 is compressed with the seal portion 2 of the gasket 1 abutting against the mating member, which causes the center portion of the gasket 1 to bend. .

As a result, the seal portion 2 of the gasket 1 comes into pressure contact with the mating member by its elastic force, and at this time, the pressure contact surface of the seal portion 2 has a sealing property with respect to the mating member. It is like this.

In the gasket 1 described above, even if the dimensional error of the depth of the groove 4 formed in the one member 3 is large, the gasket 1 can be flexibly handled and can be well sealed. ing.

That is, the gasket 1 has the seal portion 2 formed by gradually reducing the thickness from the central portion toward both end surfaces, and further, the inner peripheral surface is formed parallel to the axis. Therefore, when a pressing force that compresses the gasket 1 in the axial direction acts on the gasket 1, the central portion of the gasket 1 can be bent.

Therefore, when the gasket 1 is mounted in the groove 4 formed in the one member 3, the seal portions 2 formed on both end surface sides of the gasket 1 are bent inwardly. Since the gasket 1 can be freely set in width by being deformed into a V shape, it is possible to deal with an error in the groove depth of the groove 4.

First, after arranging the gasket 1 in the groove 4, when the gasket 1 is pressed by the one member 3 and the other member 5, this pressing force causes the gasket 1 to bend at its central portion and to seal both seals. The part 2 bends inward and is deformed so as to be compressed in the axial direction.

Then, in the gasket 1, since the seal portions 2 on both end surface sides come close to each other, according to the distance between the facing surfaces of the bottom surface of the groove 4 and the end surface of the other member 5, The width of the sket 1 is reduced as a whole so that the error in the depth of the groove 4 can be accommodated.

For example, in the case where the groove 4 of one member 3 is formed large as shown in FIG. 3, when the gasket 1 is mounted in the groove 4, the seal portion 2 bends a little, The width dimension of the gasket 1 is set so as to match the depth dimension of the groove 4.

Next, as shown in FIG. 4, when the groove 4 of the one member 3 is formed small, when the gasket 1 is mounted in the groove 4, the seal portion 2 is bent relatively largely. By doing so, the width dimension of the gasket 1 corresponds to the depth dimension of the groove 4.

As described above, when the gasket 1 is mounted in the groove 4 of the one member 3, the width dimension can be freely set by the bending angle of the central portion, so that the one member 3 can be set. It is possible to flexibly deal with the variation in the dimensional error of the depth of the formed groove 4.

Therefore, in the gasket 1, in order to reduce the weight, the sealing property can be secured even if a resin or the like having a low processing accuracy is used as the material of the member.

FIG. 5 shows a modification of the first embodiment.

That is, the gasket 11 shown in FIG. 5 is one in which the annular recess 16 is formed on the inner peripheral surface of the gasket 1 of the first embodiment, and other configurations are those of the first embodiment. Since it is the same as, the detailed description will be omitted by giving the same reference numerals.

By forming the concave portion 16 on the inner peripheral surface of the gasket 11 as described above, the central portion of the gasket 11 is easily bent.

The gaskets 1 and 11 of the first embodiment and the modified examples thereof can be very easily manufactured.

That is, the molding die for molding the gasket 1 of the first embodiment has an upper die 31 and a lower die 32, as shown in FIG. The bite 33 is formed so that the mold structure can be made very simple.

Further, also in the molding die for molding the gasket 11 of the modified example of the first embodiment, as shown in FIG. 7, an upper mold 41, a middle mold 44 and a lower mold 42 are respectively matched. By doing so, the respective molds cooperate with each other to form the cavity 43 inside, and in this case as well, it is possible to make the mold structure very simple similarly.

Therefore, the manufacturing cost of the mold can be reduced, and the moldability of the gaskets 1 and 11 can be made very good.

In the first embodiment and its modified examples, the inner peripheral surface of the gaskets 1 and 11 is formed parallel to the axis, but the outer peripheral surface may be formed parallel to the axis. Yes. In this case, the top part 1a is formed on the inner peripheral side of the gaskets 1 and 11, and when the top part 1a is mounted in the groove 4 of the one member 3, the center parts of the gaskets 1 and 11 are bent, The seal portion 2 is bent outward.

Next, a second embodiment of the gasket according to the present invention will be described with reference to FIGS. 8 and 9.

That is, the gasket 21 shown in FIG. 8 and FIG. 9 is made of a rubber-like elastic body having an annular shape as a whole, and has an annular shape formed by gradually reducing the thickness toward one end surface side thereof. It has a seal portion 22, an inner peripheral surface is formed parallel to the axis, and an annular fixing portion 26 is formed on the other end surface side.

Then, when this gasket 21 is mounted in the groove 24 formed in the one member 23, the gasket 21 has one member 23 and the other member 23 with the root portion of the seal portion 22 bent. It is arranged so as to be interposed between the member 25 and the member 25 to seal between both members, and further, the gasket 21 is fixed in the groove 24 by the fixing portion 26.

In FIGS. 8 and 9, the gasket 21 is made of a rubber-like elastic body having a good sealing property and has an annular shape as a whole. At this time, its inner peripheral surface is parallel to the axis. Is formed in.

The gasket 21 has an annular seal portion 22 that can abut the other member 25. The seal portion 22 is formed by gradually reducing the wall thickness from the other end surface portion of the gasket 21 toward the one end surface side, whereby the cross-sectional shape of the seal portion 22 is a right angle. It is formed to form a triangle.

An annular fixing portion 26 that can contact the bottom surface of the groove 24 of the one member 23 is formed on the end surface opposite to the end surface on which the seal portion 22 is formed. The fixing portion 26 is formed relatively large in the radial direction on the other end surface side of the gasket 21 to increase the contact area with the mating member. Also, it is shown that it is formed to extend slightly inward.

As shown in FIG. 9, the gasket 21 configured as described above is mounted in the groove 24 formed in one of the two members 23.

In FIGS. 8 and 9, one member 23 is, for example, a housing or a casing in which a recess opening on the end face side is formed, or a tubular member, and the like. An annular groove 24 is formed so as to surround the opening of the internal cavity. At this time, the depth of the groove 24 is set to be smaller than the width of the gasket 21.

The other member 25 is, for example, a lid member that closes the recess formed in the one member 23, or a tubular member that can be connected to the one member 23. .

Then, as shown in FIG. 8, with the fixing portion 26 in contact with the bottom surface of the groove 24 of the one member 23, the gasket 21 is arranged in the groove 24, and then the other member 25 is The end face is provided so as to face the end face of one member 23, and the gasket 21 is arranged to be compressed by both members. At this time, the seal portion 22 formed on one end face side of the gasket 21 is set to be in contact with the other member 25.

Next, the operation of the above will be described.

By mounting the gasket 21 in the groove 24 of the one member 23 as described above, the gasket 21 comes to be interposed between the one member 23 and the other member 25. The space between the one member 23 and the other member 25 is sealed by the gasket 21, and the inside of the members 23 and 25 is sealed.

First, the gasket 21 is placed in the groove 24 of the one member 23, and then the gasket 21 is interposed between the one member 23 and the other member 25. Is pressed within a predetermined crushing allowance, the gasket 21 is compressed with the seal portion 22 of the gasket 21 abutting on the other member 25 and the fixing portion 26 abutting on the one member 23, respectively. As a result, the root portion of the seal portion 22 is bent.

Then, in the gasket 21, due to its elastic force, the seal portion 22 comes into pressure contact with the other member 25, and the fixing portion 26 comes into pressure contact with the bottom surface of the groove 24 of the one member 23. , And each of the pressure contact surfaces has a sealing property with respect to the mating member.

Further, in the above-mentioned gasket 21, even when there is a large dimensional error of the depth of the groove 24 formed in the one member 23, it is possible to flexibly cope with and seal well. It has become.

That is, the gasket 21 has the seal portion 22 formed by gradually reducing the thickness toward one end surface, and further, the inner peripheral surface is formed in parallel with the axis line. When a force that compresses the shaft 22 in the axial direction is applied, the root portion of the seal portion 22 can be bent.

Therefore, when the gasket 21 is mounted in the groove 24 formed in the one member 23, the seal portion 22 formed on one end surface side of the gasket 21 is bent inward. By deforming, the width of the gasket 21 can be freely set, so that it is possible to cope with an error in the depth dimension of the groove 24.

First, the gasket 21 is arranged in the groove 24, and then the gasket 21 is pressed by the one member 23 and the other member 25. Due to this pressing force, the gasket 21 bends the seal portion 22 at its root portion. Then, it bends inward and is deformed so as to be compressed in the axial direction.

Then, in the gasket 21, since the seal portion 22 formed on one end surface side comes close to the fixing portion 26 formed on the other end surface side, the bottom surface of the groove 24 and the other member The width of the gasket 21 is reduced as a whole according to the distance between the facing surfaces of the groove 25 and the end surface thereof, which corresponds to the error in the depth dimension of the groove 24.

That is, when the gasket 21 is mounted in the groove 24 of the one member 23, the width dimension of the gasket 21 can be freely set by the bending angle of the root portion of the seal portion 22. It is possible to flexibly deal with the variation in the dimensional error of the depth of the groove 24 formed in the one member 23.

Therefore, in the gasket 21, in order to reduce the weight, it is possible to secure the sealing property even if the material of the member is, for example, resin having low processing accuracy.

Furthermore, in the gasket 21 of the second embodiment described above, the gasket 21 is prevented from twisting or rolling inside the groove 24 formed in the one member 23.

That is, the gasket 21 is fixed in the groove 24 with the fixing portion 26 by the elastic force generated when the gasket 21 is mounted in the groove 24 of the one member 23. As a result, the gasket 21 is prevented from twisting or rolling inside the groove 24.

Although the inner peripheral surface of the gasket 21 is formed parallel to the axis line in the second embodiment, the outer peripheral surface may be formed parallel to the axis line. In this case, when the gasket 21 is mounted in the groove 24 formed in the one member 23, the seal portion 22 is bent outward.

[0072]

[Effect of device]

 As described above, in the past, when there was a large error in the depth dimension of the groove formed in one of the members, when the gasket was mounted in the groove, the gasket could not have a predetermined crushing allowance. Alternatively, the gasket was over-compressed and cracked to reduce the sealability.However, in this invention, when the gasket is mounted in the groove, the seal portion that abuts the mating member bends, Since the gasket width can be set freely according to the groove depth, even if there is a comparatively large error in the groove depth dimension, it is possible to flexibly respond and seal well. As a result, the sealing property is improved.

Therefore, as the material of the member, it is possible to use, for example, a material with low processing accuracy such as resin, so that versatility can be increased.

Further, in this invention, since the shape of the gasket is very simple, its moldability is excellent. Therefore, the structure of the mold for molding the gasket can be simplified. It is possible to reduce the manufacturing cost of the gasket.

In addition to this, as in the second invention, by forming a concave portion on one peripheral surface, when the gasket is attached to the groove of the one member, the central portion of the gasket is formed. Can be easily bent.

Further, in the third invention, by forming the fixing portion on the gasket, when the gasket is mounted in the groove of one member, the fixing portion firmly fixes the gasket in the groove. Since it is possible to prevent twisting, rolling, etc., it is possible to improve the sealing performance.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of a gasket according to the present invention.

FIG. 2 is a diagram showing a state in which the gasket shown in FIG. 1 is arranged in a groove.

FIG. 3 is a diagram for explaining the operation of the first embodiment.

FIG. 4 is a diagram illustrating the operation of the first embodiment.

FIG. 5 is a diagram illustrating a modified example of the first embodiment.

6 is a view showing a molding die for molding the gasket shown in FIG.

7 is a view showing a molding die for molding the gasket shown in FIG.

FIG. 8 is a view showing a second embodiment of the gasket according to the present invention.

FIG. 9 is a diagram for explaining the operation of the second embodiment.

[Explanation of symbols]

 1, 11, 21 ... Gasket 1a ... Top part 2, 22 ... Seal part 3, 5, 23, 25 ... Member 4, 24 ... Groove 16 ... Recess 26 ... Fixing part 31, 41 ... Top Mold 32, 42 ... Lower mold 33, 43 ... Cavity 44 ... Medium

Claims (3)

[Scope of utility model registration request] 1. An annular gasket which seals between two members by being fitted in an annular groove (4) formed in one member (3) of the two members, and which has both ends from a central portion thereof. It has an annular seal part (2) formed by gradually reducing the thickness toward the surface, and one peripheral surface is formed parallel to the axis line, so that when it is mounted in the groove (4), the central part is formed. Gasket characterized by being bendable. 2. An annular gasket which seals between two members by being fitted in an annular groove (4) formed in one member (3) of the two members, and which has both ends from a central portion thereof. It has an annular seal part (2) formed by gradually reducing the thickness toward the surface, and an annular recess (16) is formed in the central part of one peripheral surface, and thereby, to the groove (4). The gasket is characterized in that the center part can be bent when it is attached. 3. An annular gasket which seals between two members by being fitted in a groove (24) formed in one member (23) of the two members, and which faces toward one end face thereof. An annular seal portion (22) formed by gradually reducing the wall thickness, one peripheral surface of which is formed parallel to the axis, and the other end surface side of which is capable of contacting with the groove (24). A fixing portion (26) of the groove (2) is formed.
A gasket characterized in that the root portion of the seal portion (22) can be bent when it is attached to (4).