JP2004332864A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket enabling mountability, preventing from being fallen, improving sealing performance in a mounting groove, and stabilizing sealing performance by preventing a low rigidity member from being deformed when a member having the gasket is formed of the low rigid member. <P>SOLUTION: This gasket comprises seal lips 3a and 3b fitted in the mounting groove and developing a self seal performance against the mounting groove when installed between two members and a pair of seal lips 4a and 4b expanded to the outside to be fitted to a cover and having the self sealing function. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a gasket.
[0002]
[Prior art]
Normally, when the gap between the two members is sealed with a gasket, a mounting groove is provided in one member, the gasket is mounted in this mounting groove, and a groove is provided between the groove bottom of the mounting groove and the surface of the other member. The gasket is tightly sealed by close contact.
[0003]
As a gasket, a so-called squeeze type gasket that crushes a rubber cross section such as an O-ring or a rubber-like elastic body having a rectangular cross section is mainly used.
[0004]
The gasket main body is provided narrower than the width of the mounting groove, and the tongue portion is provided obliquely upward from the bottom of the gasket main body and wider than the width of the mounting groove to protrude in a ring shape, thereby improving the mounting performance and the sealing performance. Known gaskets are known (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-64-53571 [0006]
[Problems to be solved by the invention]
By the way, in a housing or a lid (for example, a head cover of a cylinder head or a cover of a magnetic disk device of a precision electronic device) constituting one member or the other member provided with a gasket, for the purpose of weight reduction and cost reduction, In some cases, thinning or resinification is performed.
[0007]
And, when the gasket is brought into close contact with the housing or lid made of such a thin plate or resin, that is, using a member having relatively low strength, the housing and lid are deformed by the repulsive force of the rubber of the gasket, There is a possibility that the sealing property is reduced.
[0008]
The present invention has been made in order to solve the above-described problems of the related art, and an object of the present invention is to improve the mountability, prevent falling off when a member provided with a gasket is made of a low-rigidity member. It is an object of the present invention to provide a gasket that stabilizes sealing performance by improving sealing performance in a mounting groove and preventing deformation of a low-rigidity member.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention,
A gasket that is mounted in a mounting groove formed in at least one of the two opposing members, and seals a gap between the two members,
From at least one end of a tip portion provided on the one member side of the gasket main body and having a width shorter than the groove width of the mounting groove, the gasket body extends in an inclined manner so as to spread toward the other member side of the two members. A seal portion provided so that the width of the end portion on the other member side is wider than the groove width;
A sealing lip having a self-sealing function extending from the gasket main body and abutting on the other member to bend and being in close contact with the other member by the pressure of a sealing fluid;
It is characterized by having.
[0010]
With such a configuration, the seal portion exerts a self-sealing function in the mounting groove, which is in close contact with the mounting groove by the pressure of the sealing fluid, and improves sealing performance in the mounting groove. it can.
[0011]
In addition, the work of inserting the gasket into the mounting groove can be simplified by extending the seal portion inclining so as to spread toward the other member side, that is, by forming the seal portion to have a substantially tapered cross section. In addition, since the seal portion is provided so that the width of the end on the other member side is wider than the groove width, the gasket does not fall off the mounting groove.
[0012]
Here, the seal portion may be provided with a portion (for example, a seal lip) that extends inclining from one end of the distal end portion toward the other member side (for example, a seal lip). It is preferable that a pair of portions (for example, seal lips) that extend inclining so as to spread toward the side wall are provided so as to be in close contact with both sides of the side wall.
[0013]
The flexure extending from the gasket main body and abutting on the other member means that the seal lip provided extending from the gasket main body abuts on the other member when the gasket is mounted and the two members are assembled. It shows that it bends. By providing such a seal lip, the repulsive force of the gasket against the other member can be reduced, and when the gasket is mounted in the mounting groove and the two members are assembled, the deformation of the other member or one member is reduced. Can be prevented.
[0014]
The two seal lips are provided from the gasket main body toward the other member, and when provided between the two members, are bent so as to spread in a direction away from each other and are in contact with the other member. It is also suitable.
[0015]
When the two members are assembled, the seal lip abuts on the other member and then flexes away from each other as the two members approach. In a state where the two members are assembled, the two members are bent so as to spread in directions away from each other and are in contact with the other member. Therefore, the repulsive force against the other member can be reduced, and when the gasket is mounted in the mounting groove and the two members are assembled, deformation of the other member or one member can be prevented. Further, in a state where the seal lip is bent so as to spread in a direction away from each other and abuts on the other member, the seal lip is attracted to the other member (sticks and acts as a suction cup). The sealing performance is improved by more closely contacting the member.
[0016]
It is also preferable that the distal end portion of the seal portion constitutes a seal surface with respect to the groove bottom of the mounting groove.
[0017]
This makes it possible to stabilize the sealing performance in the mounting groove together with the sealing portion that is in close contact with the side wall of the mounting groove. In the case where a pair of seal portions are provided so as to be in close contact with both sides of the side wall, the gasket is held at three places of the side wall and the groove bottom in the mounting groove, and is stable in the mounting groove. It is possible to exhibit stable sealing performance.
[0018]
It is also preferable that at least one of the two members is formed of a member having low rigidity. Since the low-rigidity member (low-strength member) is not deformed by the repulsive force of the rubber-like elastic gasket, a thin plate or resin is used for the purpose of weight reduction and cost reduction. Can also be suitably applied.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Preferred embodiments of the present invention will be illustratively described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to them unless otherwise specified. Absent.
[0020]
FIG. 1 is a schematic sectional view showing a gasket according to an embodiment of the present invention, and FIG. 2 is a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted in a mounting groove.
[0021]
The gasket 1 according to the present embodiment seals a gap between two members, and in particular, when at least one of the two members is formed of a member having low strength by thinning, resinification, or the like. It is preferably applied to
[0022]
The gasket 1 according to the present embodiment is mounted in a mounting groove 11 provided in a housing 10 as one of the two members, and the mounting groove 11 and a lid as the other member of the two members. The seal is formed by forming a seal surface on the surface of the seal 20. In the present embodiment, an example in which the lid 20 is a plane having only a surface will be described, but a groove may be dug in addition to the plane.
[0023]
The gasket 1 is formed in a ring shape by a rubber-like elastic body, and generally includes a gasket main body 2, a seal portion 3 which comes into contact with a surface in the mounting groove 11 when mounted in the mounting groove 11, and a gasket 1. When the cover 20 is attached to the housing 10 in a state in which the cover 20 is mounted in the mounting groove 11, there are provided seal lips 4a and 4b which come into contact with the cover 20.
[0024]
First, the seal portion 3 will be described.
[0025]
In the seal portion 3, a self-seal which is in close contact with the mounting groove 11 and whose close contact force increases in accordance with the pressure applied to the lip when pressure is applied from the fluid side A to be sealed and from the fluid side B to be sealed. Has functions.
[0026]
The seal portion 3 is provided on the housing 10 side of the seal body 2, has a width a smaller than the width c of the mounting groove 11, and has a tip 3 c that is in close contact with the groove bottom 12 of the mounting groove 11, A pair of seal lips 3a, 3b are provided which incline toward the side walls 13, 14 of the mounting groove 11 and the lid 20 side (opening side of the groove), extend in a tapered shape, and come into close contact with the side walls 13, 14. . The seal lips 3a and 3b are inclined and extend so as to extend from the front end 3c toward the side walls 13 and 14 of the mounting groove 11 and the lid 20 side (opening side of the groove), and have a width dimension b of the end on the lid 20 side. Has a substantially tapered cross section provided to be wider than the width dimension c of the mounting groove 11.
[0027]
With such a shape, the tip 3c forms a sealing surface that is in close contact with the groove bottom 12, and the sealing lips 3a and 3b are pressed when pressure is applied from the fluid side A to be sealed and from the fluid side B to be sealed. The sealing groove exerts a self-sealing function in which the close contact force between the mounting groove 11 and the side walls 13 and 14 increases according to the pressure applied to the lip.
[0028]
In addition, the seal lips 3a and 3b have a tip 3c having a width smaller than that of the mounting groove 11, and extend from the tip 3c toward the side walls 13 and 14 of the mounting groove 11 and the opening side of the groove. Since it has a substantially tapered cross section, the operation of inserting the gasket 1 into the mounting groove 11 can be simplified.
[0029]
Here, in the cross-sectional shape of the gasket 1, the portion from the tip 3c to the tip of the seal lip 3a, 3b may be linear or curved, and for example, the seal lip 3b may be provided from the seal lip 3a via the tip 3c. It may be formed in an arc shape up to this point, and the tip on the arc-shaped groove bottom side may be the tip 3c.
[0030]
Further, when the gasket 1 is mounted in the mounting groove 11, the lip tips of the seal lips 3a and 3b are in close contact with the side walls 13 and 14 of the mounting groove 11, so that the gasket 1 falls out of the mounting groove 11 and falls off. There is no such problem, and the workability at the time of gasket mounting work can be improved.
[0031]
The seal portion 3 is in close contact with the tip 3c and the seal lip 3a, 3b with respect to the groove bottom 12 and the side walls 13, 14 of the mounting groove 11, respectively. , And does not twist or fall in the mounting groove 11.
[0032]
Next, the seal lips 4a and 4b will be described.
[0033]
The seal lips 4 a and 4 b are provided on the lid 20 side of the gasket main body 2, have a substantially V-shaped cross section, and extend from the gasket main body 2 to the lid 20 side. The sealing lips 4a, 4b are formed in a substantially V-shaped cross section by providing an opening 4c on the lid 20 side of the gasket main body 2.
[0034]
Here, the seal lips 4a and 4b are not limited to a substantially V-shaped cross section, and the opening 4c may be a groove having a substantially V-shaped cross section or a substantially U-shaped (or arc-shaped) cross section. . In other words, a pair of gasket main bodies 2 may be provided on the lid 20 side via the opening 4c so as to extend toward the lid 20 side.
[0035]
When the lid 20 is mounted on the housing 10 with the gasket 1 mounted in the mounting groove 11, the seal lips 4a and 4b bend along the surface of the lid 20 to be mounted, and the lip ends spread outward, The space between the seal lips 4a and 4b is open, and the lid 20 is attached to the housing 10 in close contact with the lid 20.
[0036]
As a result, the compressive force applied to the gasket main body 2 due to the attachment of the lid 20 to the housing 10 is reduced by being absorbed by the seal lips 4a and 4b, so that the repulsive force on the lid 20 is also reduced.
[0037]
Therefore, when the lid 20 is made of a member having low strength due to thinning, resinification, or the like, the lid 20 does not deform due to the repulsive force generated when the gasket is compressed.
[0038]
Further, since the seal lips 4a and 4b have a shape in which the lips spread outward and come into close contact with the lid 20, the gasket 1 mounted in the mounting groove 11 can be stabilized. In a state where the seal lips 4a and 4b are bent so as to spread in a direction away from each other and come into contact with the lid 20, the seal lips 4a and 4b are attracted to the lid 20, so that the seal lips 4a and 4b are more closely attached to the lid 20. This improves the sealing performance.
[0039]
In addition, since the seal lips 4a and 4b are in a shape spreading outward and are in close contact with the lid 20, when pressure is applied from the fluid to be sealed and the fluid to be sealed off, the sealing force against the lid 20 is reduced. It exerts a self-sealing function that increases according to the pressure applied to the lip, and prevents the outflow of the fluid to be sealed from the fluid side A to be sealed and the invasion of foreign matter from the fluid side B (outside) to be sealed. It can be prevented.
[0040]
By providing the seal lips 4a and 4b on the gasket main body 2 in this manner, the compressive force on the gasket main body 2 when the lid 20 is attached to the housing 10 is reduced, and the repulsive force on the lid 20 is also reduced. The deformation of the lid 20 does not occur.
[0041]
Further, when the lid 20 is attached to the housing 10, the sealing lips 4 a and 4 b reduce the repulsive force of the rubber on the lid 20 and reduce the compressive force on the gasket main body 2, thereby reducing the mounting groove. It is conceivable that the surface pressure on the mounting groove 11 may be reduced. However, in the present embodiment, since the sealing portion 3 having the self-sealing function in the mounting groove 11 is provided, the sealing in the mounting groove 11 is performed. There is no loss of performance.
[0042]
As described above, according to the present embodiment, the seal lip 4a, 4b and the seal lip 3a, 3b that exhibit a self-sealing function are provided in the lid 20 and the mounting groove 11, respectively. It is possible to prevent the fall of the sealing performance by preventing the lid 20 and / or the housing 10 from being deformed while improving the mountability to the device, preventing the falling off, and improving the sealing performance in the mounting groove 11. . Therefore, it is possible to stabilize the sealing performance.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to improve the mounting property, prevent the falling off, improve the sealing performance in the mounting groove, and prevent the deformation of the low-rigidity member. It is possible to stabilize the sealing performance.
[Brief description of the drawings]
FIG. 1 is a view showing a gasket according to an embodiment of the present invention.
FIG. 2 is a view showing a state in which the gasket according to the embodiment of the present invention is mounted in a gap between two members.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Gasket 2 Gasket main body 3 Seal part 3a, 3b Seal lip 3c Tip 4a, 4b Seal lip 4c Opening 10 Housing 11 Mounting groove 12 Groove bottom 13, 14 Side wall 20 Cover

Claims (4)

A gasket that is mounted in a mounting groove formed in at least one of the two opposing members, and seals a gap between the two members,
From at least one end of a tip portion provided on the one member side of the gasket main body and having a width shorter than the groove width of the mounting groove, the gasket body extends in an inclined manner so as to spread toward the other member side of the two members. A seal portion provided so that the width of the end portion on the other member side is wider than the groove width;
A sealing lip having a self-sealing function extending from the gasket main body and abutting on the other member to bend and being in close contact with the other member by the pressure of a sealing fluid;
A gasket comprising: The seal lip is provided two from the gasket main body toward the other member side, and when provided between the two members, is bent so as to spread in a direction away from each other and abuts on the other member. The gasket according to claim 1, wherein the gasket is provided. The gasket according to claim 1, wherein the tip portion of the seal portion forms a seal surface with respect to the groove bottom of the mounting groove. The gasket according to any one of claims 1 to 3, wherein at least one of the two members is formed of a member having low rigidity.

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