JP2018197588A - Gasket and sealing structure - Google Patents

Abstract

To provide a gasket and a sealing structure, enabling making even a gasket comprising a rubber-like elastic single body retain stable sealability.SOLUTION: A gasket 100 comprises a rubber-like elastic single body which seals a gap between a member 200 with an opening opened to an end face 240 side and having a step in which an inner diameter is larger in the end face 240 side, and a fixed member 300 fixed to the member 200 with the opening. The gasket includes: a cylindrical trunk part 110 mounted on a step part of the opening, and an outward flange part 120 provided in an end part at a fixed member 300 side in the trunk part 110 and arranged in a gap between the end face 240 of the member 200 with the opening, and an end face 320 of the fixed member 300, and a portion adjacent to the outward flange part 120 in the trunk part 110 is provided with an annular recess 111.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gasket and a sealing structure for sealing a gap between two members fixed to each other.

  As a gasket that seals a gap between two members fixed to each other, a gasket that is mounted on a stepped portion of an opening provided in one of the two members is known. With reference to FIGS. 6-9, the gasket and sealing structure which concern on a prior art example are demonstrated. FIG. 6 is a schematic cross-sectional view of a conventional gasket. 7 to 9 are schematic cross-sectional views of a sealing structure according to a conventional example.

  The gasket 500 according to the conventional example is provided to seal a gap between two members fixed to each other. Hereinafter, one member of the two members is referred to as a member 200 with an opening, and the other member is referred to as a fixed member 300. The member with opening 200 and the fixed member 300 are provided with fluid passages 210 and 310, respectively. The gasket 500 prevents the fluid flowing through the passages 210 and 310 from leaking from the gap between the member 200 with the opening and the fixed member 300, and external foreign matter enters the passages 210 and 310. It plays a role of suppressing intrusion.

  Moreover, in the member 200 with an opening part, the channel | path 210 has an opening part opened toward the end surface 240 side. The opening has a step with a larger inner diameter on the end face side. That is, the member 200 with an opening has a small diameter passage 210, a large diameter passage 220 having an inner diameter larger than the passage, and a step surface 230 between the passage 210 and the large diameter passage 220.

  The gasket 500 includes a cylindrical body portion 510 attached to the step portion of the opening, an outward flange portion 520 provided at an end of the body portion 510 on the fixed member 300 side, and a body portion 510. It is comprised from the inward flange part 530 provided in the edge part by the side of the member 200 with an opening part. The outward flange portion 520 is configured to be disposed in a gap between the end surface 240 of the member 200 with the opening and the end surface 320 of the fixed member 300. Further, the outer peripheral surface of the body portion 510 is configured to be in close contact with the inner peripheral surface of the large-diameter passage 220, and the end surface of the inward flange portion 530 is configured to be in close contact with the step surface 230.

  The gasket 500 according to the conventional example configured as described above is mounted in a compressed state by the member 200 with the opening and the fixed member 300. However, when the gasket 500 is mounted, the body portion 510 may be bent so that the outward flange portion 520 opens radially outward. Along with this, the vicinity of the boundary between the body portion 510 and the outward flange portion 520 greatly protrudes into the gap between the end surface 240 of the member 200 with the opening and the end surface 320 of the member to be fixed 300, and is damaged. There is also a risk that the sealing performance will deteriorate. It should be noted that the compression amount acting on the gasket 500 in a state where the gasket 500 is mounted is slightly different depending on the dimensional tolerance of each member. FIG. 7 shows a state where the compression amount is the lowest, FIG. 8 shows a state where the compression amount is average, and FIG. 9 shows a state where the compression amount is the highest. For example, as indicated by an arrow X in FIG. 7, the vicinity of the boundary between the body portion 510 and the outward flange portion 520 is within the gap between the end surface 240 of the member 200 with the opening and the end surface 320 of the fixed member 300. May protrude significantly. Further, as shown in FIG. 8, the body portion 510 may be greatly deformed so that the outward flange portion 520 opens radially outward.

  As described above, in the gasket 500 according to the conventional example, there is a possibility that the sealing performance may become unstable due to scratches or an unstable posture.

  In addition, in order to stabilize the posture of the gasket, a technique in which a metal ring is provided inside a rubber-like elastic gasket is also known. However, in such a technique, the number of parts increases and the number of manufacturing processes increases, resulting in an increase in cost.

Japanese Utility Model Publication No. 60-9481 JP 2010-236580 A International Publication No. 2012/005165

  An object of the present invention is to provide a gasket and a sealing structure that can maintain stable sealing performance even if the gasket is made of a rubber-like elastic body alone.

  The present invention employs the following means in order to solve the above problems.

That is, the gasket of the present invention is
A gap between the member with an opening provided with an opening that opens toward the end surface and has a step having a larger inner diameter on the end surface, and the member to be fixed fixed to the member with the opening It is a gasket made of a single rubber-like elastic body that seals
A cylindrical body portion mounted on the stepped portion of the opening;
An outward flange portion provided at an end of the body portion on the fixed member side and disposed in a gap between an end surface of the member with an opening and an end surface of the fixed member;
With
An annular recess is provided in a portion of the body portion adjacent to the outward flange portion.

The sealing structure of the present invention is
A member with an opening provided with an opening that opens toward the end surface and has a step with a larger inner diameter on the end surface;
A fixed member fixed to the member with the opening,
A gasket made of a single rubber-like elastic body that seals the gap between the member with the opening and the fixed member;
A sealing structure comprising:
The gasket is
A cylindrical body portion mounted on the stepped portion of the opening;
An outward flange portion provided at an end of the body portion on the fixed member side and disposed in a gap between an end surface of the member with an opening and an end surface of the fixed member;
With
An annular recess is provided in a portion of the body portion adjacent to the outward flange portion.

According to the present invention, since the annular recess is provided in the body portion adjacent to the outward flange portion, the body is in the gap between the end surface of the member with the opening and the end surface of the fixed member. It can suppress that a part of part protrudes large. Therefore, it can suppress that a trunk | drum will get a damage | wound, and can maintain the stable sealing performance.

  The end surface of the gasket on the fixed member side may be formed by a tapered surface that decreases in diameter toward the fixed member side.

  As a result, when the end surface on the fixed member side of the gasket is in close contact with the end surface of the fixed member, the end portion of the gasket on the fixed member side is inclined with the tip of the outward flange portion toward the fixed member side. It deforms as follows. Therefore, it can suppress that the edge part by the side of the to-be-fixed member of a gasket deform | transforms so that it may open toward a radial direction outer side. Thereby, the attitude | position when a gasket is mounted | worn can be stabilized.

  Furthermore, the diameter of the most distal portion on the side of the member with the opening in the gasket may be larger than the diameter of the most distal portion on the fixed member side. Thereby, it can suppress that the edge part by the side of the to-be-fixed member of a gasket deform | transforms so that it may open toward a radial direction outer side.

  In addition, said each structure can be employ | adopted combining as much as possible.

  As described above, according to the present invention, even a gasket made of a single rubber-like elastic body can maintain stable sealing performance.

FIG. 1 is a partially broken sectional view of a gasket according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view showing a sealing structure according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing a sealing structure according to an embodiment of the present invention. FIG. 4 is a schematic sectional view showing a sealing structure according to an embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing a sealing structure according to an embodiment of the present invention. FIG. 6 is a schematic cross-sectional view of a conventional gasket. FIG. 7 is a schematic cross-sectional view of a sealing structure according to a conventional example. FIG. 8 is a schematic cross-sectional view of a conventional sealing structure. FIG. 9 is a schematic cross-sectional view of a sealing structure according to a conventional example.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail 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 those unless otherwise specified. .

(Example)
With reference to FIGS. 1-5, the gasket and sealing structure which concern on the Example of this invention are demonstrated. The gasket and the sealing structure according to the present embodiment are used to seal a gap between various two members fixed to each other such as a case, a cover, and tubes. In this embodiment, a case where a gasket is applied to a portion that seals a gap between two members having a passage through which a fluid such as oil flows will be described as an example. One of the two members is provided with an opening having a step, and is referred to as a member 200 with an opening. Further, the other member of the two members is referred to as a member to be fixed 300 because it is fixed to the member 200 with the opening.

<Gasket>
In particular, the configuration of the gasket 100 according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a partially broken sectional view of a gasket 100 according to an embodiment of the present invention. The gasket 100 according to the present embodiment has a rotationally symmetric shape, and FIG. 1 shows a diagram in which a part (left side in the drawing) is cut along a plane including the central axis. FIG. 2 is a schematic cross-sectional view showing a sealing structure according to an embodiment of the present invention. In FIG. 2, a cross section cut along a plane including the central axis of the gasket 100 is shown. Further, in the following description, one end side (upper side in FIGS. 1 and 2) of the gasket 100 is a side where the member to be fixed 300 is provided in a state where the gasket 100 is mounted. It corresponds to. The other end side (the lower side in FIGS. 1 and 2) of the gasket 100 is the side where the member with opening 200 is provided in the state where the gasket 100 is mounted, Equivalent to.

  The gasket 100 is composed of a single rubber-like elastic body. The gasket 100 includes a cylindrical (substantially cylindrical) body portion 110 and an outward flange portion 120 provided on one end side of the body portion 110. Further, an annular recess 111 is provided in a portion of the outer peripheral surface of the body portion 110 adjacent to the outward flange portion 120. Further, the end surface on one end side of the gasket 100 is constituted by a tapered surface 112 that is reduced in diameter toward one end side. In addition, an annular seal protrusion 113 that protrudes toward the other end side is provided on the other end side of the body portion 110. The diameter of the leading end portion on the other end side of the gasket 100 (corresponding to the diameter of the tip portion of the seal protrusion 113) d2 is designed to be larger than the diameter d1 of the leading end portion on one end side of the gasket 100. Yes.

<Sealing structure>
In particular, with reference to FIG. 2, the sealing structure according to the present embodiment will be described. The sealing structure according to the present embodiment includes the above-described member with an opening 200, a member to be fixed 300 fixed to the member with an opening 200, and a gap between the member with an opening 200 and the member to be fixed 300. It is comprised from the gasket 100 which seals.

  The member with opening 200 and the fixed member 300 are provided with fluid passages 210 and 310, respectively. And in the member 200 with an opening part, the channel | path 210 has an opening part opened toward the end surface 240 side. The opening has a step having a larger inner diameter on the end surface 240 side. That is, the member 200 with an opening has a small diameter passage 210, a large diameter passage 220 having a larger inner diameter than the passage 210, and a step surface 230 between the passage 210 and the large diameter passage 220. . Both the inner peripheral surface of the passage 210 and the inner peripheral surface of the large-diameter passage 220 are configured by cylindrical surfaces.

  In the gasket 100, the fluid flowing through the passages 210 and 310 provided in the opening member 200 and the fixed member 300 respectively leaks from the gap between the opening member 200 and the fixed member 300. In addition to suppressing this, it plays a role of suppressing external foreign matter from entering the passages 210 and 310.

  The body portion 110 of the gasket 100 is attached to the step portion of the opening in the member with opening 200. As a result, the outer peripheral surface of the body portion 110 is in close contact with the inner peripheral surface of the large diameter passage 220, and the seal protrusion 113 is in close contact with the step surface 230. The outward flange portion 120 of the gasket 100 is disposed in the gap between the end surface 240 of the member 200 with the opening and the end surface 320 of the fixed member 300. Further, the end surface (tapered surface 112) on one end side of the gasket 100 is in close contact with the end surface 320 of the fixed member 300. With the above configuration, the gap between the member with opening 200 and the fixed member 300 is sealed by the gasket 100.

<Excellent points of gasket and sealing structure according to this embodiment>
According to the gasket 100 and the sealing structure according to the present embodiment, stable sealing performance can be maintained even if the gasket 100 is formed of a single rubber-like elastic body. This point will be described in detail with reference to FIGS. 3 to 5 are schematic cross-sectional views showing how the gasket 100 is mounted. When the gasket 100 is mounted, the compression amount acting on the gasket 100 by the member with opening 200 and the fixed member 300 is slightly different depending on the dimensional tolerance of each member. 3 shows a state where the compression amount is the lowest, FIG. 4 shows a state where the compression amount is average, and FIG. 5 shows a state where the compression amount is the highest.

  In a state where the gasket 100 is mounted, the gasket 100 is compressed by the stepped surface 230 of the opening in the member 200 with the opening and the end surface 320 of the fixed member 300. Thereby, the trunk | drum 110 in the gasket 100 deform | transforms so that it may expand to a radial direction outer side. Therefore, the vicinity of the boundary between the body portion 110 and the outward flange portion 120 is deformed so as to approach the corner portion between the end surface 240 of the member with opening 200 and the inner peripheral surface of the large-diameter passage 220. However, in the gasket 100 according to the present embodiment, since the annular recess 111 is provided in the vicinity of the boundary between the body portion 110 and the outward flange portion 120, strong pressing against the corner portion is suppressed. Moreover, it can suppress that a part of trunk | drum 110 protrudes in the clearance gap between the end surface 240 of the member 200 with an opening part, and the end surface 320 of the to-be-fixed member 300. FIG. Therefore, it can suppress that the trunk | drum 110 is damaged, and can maintain the stable sealing performance.

  Moreover, the end surface of the one end side in the gasket 100 which concerns on a present Example is comprised by the taper surface 112 diameter-reduced toward one end side. As a result, when the end face on one end side of the gasket 100 is in close contact with the end face 320 of the fixed member 300, the end part on the one end side of the gasket 100 is directed toward the fixed member 300 side. Deforms to tilt. Therefore, it can suppress that the edge part of the one end side of the gasket 100 deform | transforms so that it may open toward a radial direction outer side.

  In addition, the diameter d2 of the most distal portion on the other end side in the gasket 100 according to the present embodiment is larger than the diameter d1 of the most distal portion on the side. Also by this, it can suppress that the edge part of the one end side of the gasket 100 deform | transforms so that it may open toward a radial direction outer side.

  As described above, the fact that the end surface on one end side of the gasket 100 is constituted by the tapered surface 112 that decreases in diameter toward the one end side and that the relationship of d2> d1 is satisfied, It can suppress more reliably that the edge part of one end side will deform | transform so that it may open toward a radial direction outer side. Therefore, the posture when the gasket 100 is mounted can be stabilized, and the stable sealing performance can be maintained.

(Other)
In the said Example, the case where a gasket was applied to the site | part which seals the clearance gap between two members which have the channel | path through which a fluid flows was demonstrated to the example. However, the present invention is not limited to such applications. For example, the present invention can also be applied to a use for sealing between a case for containing a fluid and a cover for closing the opening of the case. That is, the present invention can be applied to a case where a step is provided in the opening of the case and a gasket is attached to the step.

DESCRIPTION OF SYMBOLS 100 Gasket 110 trunk | drum 111 annular recessed part 112 taper surface 113 seal protrusion 120 outward flange part 200 member with an opening part 210 passage 220 large diameter passage 230 step surface 240 end surface 300 fixed member 310 passage 320 end surface

Claims (6)

A gap between the member with an opening provided with an opening that opens toward the end surface and has a step having a larger inner diameter on the end surface, and the member to be fixed fixed to the member with the opening It is a gasket made of a single rubber-like elastic body that seals
A cylindrical body portion mounted on the stepped portion of the opening;
An outward flange portion provided at an end of the body portion on the fixed member side and disposed in a gap between an end surface of the member with an opening and an end surface of the fixed member;
With
The gasket characterized by the annular recessed part being provided in the site | part adjacent to the said outward flange part among the said trunk | drum parts.   2. The gasket according to claim 1, wherein the end surface on the fixed member side is formed by a tapered surface that decreases in diameter toward the fixed member side.   3. The gasket according to claim 1, wherein a diameter of the most distal portion on the member side with the opening is larger than a diameter of the most distal portion on the fixed member side. A member with an opening provided with an opening that opens toward the end surface and has a step with a larger inner diameter on the end surface;
A fixed member fixed to the member with the opening,
A gasket made of a single rubber-like elastic body that seals the gap between the member with the opening and the fixed member;
A sealing structure comprising:
The gasket is
A cylindrical body portion mounted on the stepped portion of the opening;
An outward flange portion provided at an end of the body portion on the fixed member side and disposed in a gap between an end surface of the member with an opening and an end surface of the fixed member;
With
A sealing structure in which an annular recess is provided in a portion of the body portion adjacent to the outward flange portion.   5. The sealing structure according to claim 4, wherein an end surface of the gasket on the fixed member side is formed by a tapered surface having a diameter reduced toward the fixed member side.   6. The sealing structure according to claim 4, wherein a diameter of the most distal portion on the side of the member with the opening in the gasket is larger than a diameter of the most distal portion on the fixed member side.

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