JP2022052395A - Sealing device - Google Patents

Abstract

To provide a sealing device for developing high sealing stability, which can be formed in a compact size without requiring a large space in the axial direction of an opening part.SOLUTION: A sealing device 1 for sealing a clearance formed between the opening part and a piping part includes an annular plate 2 having a through-hole part 4, and a seal body 3 having a seal bead 6 mounted on at least a single face of the annular plate 2 and having a crest type protrusion part 5 whose cross section shape in the plan view direction perpendicular to the axial direction of the opening part and the piping part shows a crest, and which abuts on part of a housing, a lip part 7 provided on the hole inner side of the through-hole part 4 further than the seal bead 6 and capable of closely contacting the outer surface of the piping part, and a waist part 8 connecting the seal bead 6 and the lip part 7, the seal bead 6, the lip part 7 and the waist part 8 being integrally formed of the same material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sealing device. More specifically, it is mainly used for connection parts and joint parts in automobile auxiliary parts such as automobile plug tubes and various machine parts of general industrial machines, and the mutual axes of machine parts and long-axis tubular piping parts. It relates to a sealing device capable of exhibiting high sealing stability even in an eccentric state where the positions of the above do not match.

O-rings and plug tube seals are used to fill the gap formed between the housing and the long-axis tubular piping portion in automobile auxiliary parts such as plug tubes that are conventionally used as related parts for internal combustion engines of automobiles. A sealing device called, etc. is often used. Further, such a sealing device is known as a gasket for sealing (sealing) between the cylinder head cover and the plug tube in an internal combustion engine or between the cylinder head cover and the injection pipe (see Patent Document 1). ..

Further, in the internal combustion engine, an annular notch is provided in the tube mounting hole drilled in the head cover so as to surround the outer periphery of the tubular nut, and the gap between the tube mounting hole and the tubular nut is sealed in the notch. An annular oil support is provided for an oil seal to be assembled (see Patent Document 2) or a lock cover made of synthetic resin, and the outer peripheral portion of the seal on the inner peripheral surface of the oil support is fixed. It is known that the upper surface of the baffle plate is welded to the lower surface of the oil seal support and the lower surface of the lock cover main body (see Patent Document 3).

As described above, the gap between the housing and the piping portion is filled with the long-axis tubular piping portion such as a plug tube inserted into the opening of a partial configuration (for example, the housing) of the mechanical component. Moreover, there is a demand for a sealing device having high sealing stability (sealing property) that regulates the flow of fluids and the like between the inside of the machine and the outside of the machine.

In such a case, the opening of the housing or the like and the piping portion inserted through the opening are each in a perfect circular shape in the cross-sectional direction in a plan view, and the axes of the respective round cross-sectional shapes are one. However, it is desirable to exhibit high seal stability. In addition, it is desirable that the opening such as the housing and the piping portion each have a linear wall surface along the axial direction.

Japanese Unexamined Patent Publication No. 2005-330996 Jikkenhei 6-53761 Gazette Jitsukaihei 6-34153 Gazette

However, in automobile auxiliary parts and other mechanical parts, the housing and the piping portion can be arranged under the ideal conditions for the seal stability as described above due to problems in product specifications or design. There wasn't. As a result, the positions of the axial centers of the openings and the piping portions of the housing and the like do not match each other, and the housing and the piping portions may be arranged in an "eccentric state" at the displaced positions.

Further, the shape of either the opening or the piping portion in the cross-sectional direction in a plan view is not a perfect circular shape, for example, an elliptical shape, or the axial direction of the piping portion is different from the axial direction of the opening such as a housing. In some cases, the pipe was inserted in a slanted state, or the long-axis tubular piping portion exhibited a curved shape curved with a predetermined curvature.

In this way, in a sealing device that seals the gap between the housing and the piping section, high sealing stability is exhibited due to the displacement of the axial center position (eccentric state) and the inclination of the piping section in the insertion direction with respect to the opening. In some cases, it was used in a state where sufficient conditions were not met. That is, there are cases where automobile auxiliary equipment parts and the like are used in a state where high sealing stability such as an eccentric state cannot be exhibited.

For example, in Patent Document 1, a large number of shapes are proposed even in an eccentric state in which the positions of the axes are deviated from each other, and a structure that solves the problem of seal stability is shown. However, in order to sufficiently ensure the followability to the displacement (eccentricity) of the axial center, for example, the shape of the lip portion provided on the gasket (sealing device) is changed to, for example, a bellows shape, and the housing. A relatively large space may be required along the axial direction of the opening. As a result, the size of the automobile auxiliary machine parts themselves becomes large, and there is a risk that the places where they can be used are limited.

Therefore, in view of the above circumstances, the present invention exhibits high sealing stability even in an eccentric state in which the positions of the axial centers of the housing opening and the long-axis tubular piping portion are deviated from each other in the plan view cross-sectional shape. It is an object of the present invention to provide a sealing device that can be formed into a compact size, which is possible and does not require a large space in the axial direction of the opening.

According to the present invention, a sealing device that solves the above problems is provided below.

[1] A long-axis tubular piping portion to be inserted into the housing and the opening of the housing is arranged in a state where an eccentric state in which the positions of the axial centers do not match with each other may occur, and between the opening and the piping portion. A sealing device for sealing the gap to be formed, the annular plate having a through hole portion, and the front surface of the annular plate which is installed on at least one surface of the annular plate and is orthogonal to the axial direction of the opening and the piping portion. A seal bead having a mountain-shaped cross-sectional shape in the visual direction and having a mountain-shaped protrusion that abuts on a part of the housing, provided inside the hole of the through hole from the seal bead, and with the outer surface of the piping portion. A seal body having a lip portion that can be closely attached and a waist portion that connects the seal bead and the lip portion, and the seal bead, the lip portion, and the waist portion integrally formed of the same material. Equipped with a sealing device.

[2] In the above [1], at least one of the lip thickness of the lip portion in the front view direction and the waist thickness of the waist portion in the front view direction is formed to be at least 2 mm or less. The sealing device described.

[3] The thickness of the lip portion in the front view direction and the waist thickness of the waist portion in the front view direction are the plates of the annular plate to which the seal bead is installed in the front view direction. The sealing device according to the above [1], which is formed thinner than the end face thickness.

[4] The sealing device according to the above [2] or [3], wherein the lip thickness and the waist thickness are formed to have the same thickness.

[5] The sealing device according to any one of [1] to [4], wherein the mountain-shaped protrusion and the lip of the seal bead project in the same direction with respect to the waist.

[6] The above-mentioned [1] to [5], wherein the mountain-shaped protrusion abuts on a part of the housing at a position inside the hole of the through-hole portion with respect to the inner peripheral hole surface of the through-hole portion. The sealing device according to any one.

[7] The lip portion further includes an elastic urging portion that further urges the tip of the lip portion toward the inside of the hole of the through hole portion, and an extended lip portion that is further extended from the tip of the lip portion. The sealing device according to any one of the above [1] to [6].

[8] The mountain-shaped protrusion is formed with a predetermined curvature, and the curvature is set to 1/3 or more of the height of the protrusion of the mountain-shaped protrusion. Any of the above [1] to [7]. Sealing device described in Crab.

[9] The sealing device according to any one of [1] to [8], wherein the piping portion has a curved shape.

According to the sealing device of the present invention, high sealing stability can be exhibited even in an eccentric state where the positions of the axial centers of the housing opening and the piping portion do not match, and fluid and the like can be reliably sealed. be able to. In addition, it does not require a large space in the axial direction of the opening of the housing, can be designed in a compact shape, and is less likely to be restricted during use.

It is a top view which shows the schematic structure of the sealing device of one Embodiment of this invention. It is a front view which shows the schematic structure of the sealing device of this embodiment. It is a right side view which shows the schematic structure of the sealing device of this embodiment. It is a back view which shows the schematic structure of the sealing device of this embodiment. FIG. 6 is an enlarged cross-sectional view taken along the line AA'in FIG. 4, showing a schematic configuration of the sealing device of the present embodiment. FIG. 3 is an enlarged cross-sectional view taken along the line BB'in FIG. 4, showing a schematic configuration of the sealing device of the present embodiment. It is a partially enlarged sectional view in FIG. 6 which shows the schematic structure of the sealing apparatus of this embodiment.

Hereinafter, embodiments of the sealing device of the present invention will be described with reference to the drawings. The sealing device of the present invention is not limited to the ones shown below, and various design changes, modifications, improvements, etc. can be made without departing from the gist of the present invention.

As shown in FIGS. 1 to 7, the sealing device 1 according to the embodiment of the present invention is mainly composed of an annular plate 2 and a sealing body 3 attached to the annular plate 2. This is a sealing device 1 for sealing a gap 103 formed between a housing 100, which is a component of a mechanical component, and a long-axis tubular piping portion 102 inserted through an opening 101 of the housing 100. ..

Here, the sealing device 1 shown in FIGS. 1 to 7 shows an embodiment of the present invention, and the sealing device of the present invention is not limited to such a shape. Further, in FIGS. 5 to 7, in order to simplify the explanation, the configurations of the housing 100 and the piping portion 102 sealed by the sealing device 1 are appropriately shown by broken lines. Further, in FIGS. 5 to 7, the annular plate 2, the elastic spring 9 described later, and the housing 100 are hatched, and the other configurations are shown without hatching. Further, FIG. 5 shows, as another configuration, a configuration related to the stopper member 104 for preventing the sealing device 1 from falling off.

In the sealing device 1 of the present embodiment, as shown in FIG. 1, the positions of the axial center C1 in the plan-view cross-sectional shape of the opening 101 of the housing 100 and the axial center C2 in the plan-view cross-sectional shape of the piping portion 102 coincide with each other. It seals the gap 103 (see FIG. 5 and the like) formed between the housing 100 and the piping portion 102 in a state where an “eccentric state” that does not occur and is in an displaced position can occur. The deviations in the positions of the axial centers C1 and C2 shown in FIG. 1 are virtualized in a plan view. The shape of the opening 101 of the housing 100 is not particularly limited. However, in the sealing device 1 of the present embodiment, it is assumed that the opening 101 has an elliptical shape, and the description will be given below. If the opening 101 of the housing 100 is not a perfect circle such as an elliptical shape or an oval shape, the deflection of the seal bead 6 described later during compression may become unstable. The sealing device 1 of the present invention can ensure high sealing stability even when the shape of the opening 101 cannot be made into a perfect circle due to a design problem or the like.

The sealing device 1 of the present embodiment is mainly composed of an annular plate 2 and a sealing body 3, and more specifically, the annular plate 2 is a metal material such as stainless steel, steel, or aluminum. It is a thin plate formed to a predetermined thickness like a cyclic metal plate using It has a shape, has an elliptical through hole 4 near the center, and is formed in an annular shape as a whole.

As shown in FIG. 1, a convex portion 2b partially protruding and a concave portion 2c partially recessed are provided on the outer peripheral surface 2a of the plate. The convex portion 2b and the concave portion 2c function as a positioning mechanism for mounting the sealing device 1 at an accurate mounting position when the sealing device 1 is mounted between the housing 100 and the piping portion 102. That is, the sealing device 1 can be arranged at the correct position by providing the housing 100 side with unevenness (not shown) that can be fitted to the convex portion 2b and the concave portion 2c, respectively.

On the other hand, the seal body 3 is installed along the inner peripheral hole surface 4a of the elliptical through hole portion 4 of the annular plate 2, and the axial direction of the opening 101 and the piping portion 102 of the housing 100 (paper surface left and right in FIG. 5). A seal bead 6 having a mountain-shaped protrusion 5 having a mountain-shaped cross-sectional shape in a plan-viewing direction (corresponding to a direction) orthogonal to a plan view (front of the paper surface and depth of the paper surface in FIG. 5) and abutting with a part of the housing 100. The lip portion 7, which is provided at the position inside the hole of the through hole portion 4 from the seal bead 6 (corresponding to the center side of the paper surface in FIG. 5) and can be in close contact with the outer surface 102a of the piping portion 102, and the seal bead 6 and the lip portion. It has a waist portion 8 connecting between the sevens, and the seal bead 6, the lip portion 7, and the waist portion 8 are integrally formed of the same material.

As shown in FIGS. 1 to 4, the seal body 3 installed in the through hole 4 is vertically (see FIG. 2) or left-right (see FIG. 3) with respect to the thin plate-shaped annular plate 2 of the present embodiment. ) Protrudingly formed.

Here, the material forming the seal body 3 is not particularly limited, and the contact state between the housing 100 and the seal bead 6 and the close contact state between the piping portion 102 and the lip portion 7 can be satisfactorily maintained. It doesn't matter if it is a thing. For example, well-known ACM (acrylic rubber), FKM (fluorine rubber), NBR (nitrile rubber), HNBR (hydrided nitrile rubber), EPDM (ethylene-propylene rubber) and other elastics that have been conventionally used as sealing devices. A deformable rubber material can be preferably used. Further, for the formation of the seal body 3, a well-known resin material molding processing technique can be used, and for example, an injection molding processing technique, an extrusion molding processing technique, an injection molding processing technique, or the like can be used. As a result, the sealed body 3 having a desired shape can be formed. The rubber hardness of the rubber material used as the seal body 3 is not particularly limited. However, for example, it is preferable that the rubber hardness range is in the range of 40 ° to 90 °. Thereby, the sealing stability of the sealing device 1 and the deformability of the lip thickness T1 and the waist thickness T2 can be improved.

When the sealing device 1 of the present embodiment has the above configuration, the mountain-shaped protrusion 5 of the seal bead 6 of the sealing body 3 comes into contact with a part of the housing 100 (see FIGS. 5 to 7). Here, since the seal body 3 is made of a rubber material such as ACM, FKM, NBR, HNBR, and EPDM that can be elastically deformed, the vicinity of the top portion 5a of the mountain-shaped protrusion 5 is formed by contact with a part of the housing 100. It can be crushed and abutted in a state where the shape of the chevron protrusion 5 is deformed. As a result, the contact state between the housing 100 and the sealing device 1 is firmly maintained by the elastic repulsive force of the chevron protrusion 5 of the sealing body 3.

On the other hand, in the lip portion 7 provided at a position facing the seal bead 6, the tip of the lip portion can be in close contact with the outer surface 102a of the piping portion 102. Since the lip portion 7 is also made of an elastically deformable rubber material, it can be pressed against the outer surface 102a of the piping portion 102 and maintain a close contact state. As a result, the gap 103 formed between the opening 101 of the housing 100 and the piping portion 102 can be sealed by the sealing device 1 of the present embodiment.

In particular, the sealing device 1 of the present embodiment includes a seal bead 6 which is attached to the annular plate 2 and has a chevron-shaped protrusion 5, a lip portion 7 which is in close contact with the piping portion 102, and further, a seal bead 6 and a lip portion 7. It is provided with a waist portion 8 that connects the spaces, and such a configuration is integrally formed of the same rubber material. Therefore, the contact state with the housing 100 and the close contact state with the piping portion 102 can be stably maintained by easily deforming each configuration of the sealing device 1.

As a result, even if the positions of the axial center C1 of the opening 101 of the housing 100 and the axial center C2 of the piping portion 102 are deviated from each other in the cross-sectional shape in a plan view, the seal bead 6 of the sealing device 1 of the present embodiment is in an eccentric state. The eccentric followability can be easily achieved by the deformation of the lip portion 7 and the lip portion 7. As a result, the gap 103 formed between the opening 101 of the housing 100 and the piping portion 102 can be reliably sealed, and high sealing stability can be maintained.

Further, in the sealing device 1 of the present embodiment, at least one of the above-mentioned lip thickness T1 and waist thickness T2 may be set to at least 2 mm or less. That is, both the lip thickness T1 and the waist thickness T2 may be at least 2 mm or less, and either the lip thickness T1 or the waist thickness T2 may be at least 2 mm or less. By setting both or both of the lip thickness T1 and the waist thickness T2 to at least 2 mm or less in this way, the strength of the seal body 3 is maintained and the deformability of the seal body 3 with respect to eccentricity is ensured. be able to. When the thickness of the lip portion T1 or the like exceeds 2 mm, it becomes difficult to deform the waist portion 8 and the lip portion 7, and it may not be possible to maintain sufficient eccentric followability. Therefore, by setting the lip thickness T1 or the like to 0.3 mm or more and 2 mm or less, suitable use as the sealing device 1 becomes possible.

The sealing device 1 of the present embodiment may have a further characteristic configuration in addition to the above configuration. That is, the lip thickness T1 (see FIG. 7) of the lip portion 7 of the seal body 3 in the front view direction and the waist thickness T2 (see FIG. 7) of the waist portion 8 in the front view direction are the same. It may be set.

That is, the thickness of each of the waist portion 8 extending from one end of the seal bead 6 and the lip portion 7 extending diagonally from one end of the waist portion 8 is "lip portion thickness T1 = waist portion thickness T2". Can be satisfied. By setting the lip thickness T1 and the waist thickness T2 to the same thickness in this way, the strength of the seal body 3 for maintaining a close contact with the piping portion 102 is strengthened, and the seal body 3 against eccentricity is increased. The easiness of deformation can be ensured. As a result, not only the lip portion 7 but also the entire waist portion can absorb the eccentricity, so that the close contact state between the piping portion 102 and the lip portion 7 can be stabilized.

Further, the lip thickness T1 of the lip portion 7 and the waist thickness T2 of the waist portion 8 are the plate end surface thickness T3 in the front view cross-sectional direction of the annular plate 2 to which the seal bead 6 is installed (see FIG. 7). It may be thinner. That is, the sealing device 1 can be configured so as to satisfy the condition of "lip portion thickness T1 (or waist portion thickness T2) <plate end face thickness T3". As a result, the sealing stability of the sealing device 1 can be further improved, and at the same time, the deformability of the lip portion thickness T1 and the waist portion thickness T2 can be further increased. In particular, since the sealing device 1 of the present embodiment can change the lip thickness T1 and the waist thickness T2 of the sealing body 3 on the circumference, for example, as shown in FIG. 5, the housing 100 When the axial center C1 of the opening 101 and the axial center C2 of the piping portion 102 are not positioned, and are in an "eccentric state" or a state in which an eccentric state can occur, the eccentric followability is exhibited. Can be done.

The sealing device 1 of the present embodiment may further have the following characteristic configuration in addition to the above characteristic configuration. For example, the protruding direction of the chevron protrusion 5 of the seal bead 6 (to the right of the paper surface in FIG. 5) and the protruding direction of the lip portion 7 (to the right of the paper surface in FIG. 5) protrude in the same direction with respect to the waist portion 8. It doesn't matter if it is. That is, in FIG. 5, the mountain-shaped protrusion 5 and the lip portion 7 project along the right direction of the paper surface (or the diagonally right direction of the paper surface) with respect to the waist portion 8 formed along the vertical direction of the paper surface.

By making the protruding directions of the chevron protrusion 5 and the lip 7 the same in this way, the protruding portion of the seal body 3 protruding from the annular plate 2 can be reduced. That is, as shown in FIGS. 2 and 3, the protruding portion of the piping portion 102 or the like in the axial direction (the vertical direction of the paper surface in FIG. 2 or the left-right direction of the paper surface in FIG. 3) can be reduced with respect to the annular plate 2.

As a result, as shown in FIGS. 2 and 3, the sealing device 1 does not require much space for projecting in the vertical direction or the horizontal direction. As a result, the sealing device 1 of the present embodiment can be made into a compact shape. As a result, when the sealing device 1 of the present embodiment is adopted for an automobile auxiliary machine part or the like, the size of the sealing device 1 itself is compact, so that it is not necessary to require a large space for mounting. This makes it possible to use the sealing device 1 of the present embodiment without being restricted by the installation space.

Further, the mountain-shaped protrusion 5 in the sealing device 1 may be characterized in that it abuts at a position inside the hole of the through hole 4 rather than the inner peripheral hole surface 4a of the through hole 4. do not have. That is, the contact position where the top portion 5a of the mountain-shaped protrusion 5 and a part of the housing 100 abut is contacted inside the inner peripheral hole surface 4a of the through hole portion 4 (the center position of the paper surface in FIG. 5). May be. With such a configuration, it is possible to increase the amount of crushing while keeping the compression ratio low, so that the contact state between the housing 100 and the sealing device 1 can be made more stable, and a high sealing can be achieved. It is possible to maintain stability.

Here, when a part of the housing 100 and the mountain-shaped protrusion 5 come into contact with each other, the mountain-shaped protrusion 5 is partially crushed by the housing 100 and is in a deformed state as described above. In this case, the contact position with the housing 100 is outside the inner peripheral hole surface 4a (upward or downward on the paper surface in FIG. 5), and the housing end surface of the housing 100 is in the middle of the chevron protrusion 5 (inclined portion). It is located and there is a possibility that only a part of the chevron protrusion 5 can be crushed and deformed. In such a case, the contact state between the housing 100 and the chevron protrusion 5 may not be stable, and the sealing stability may be impaired.

Therefore, the sealing device 1 of the present embodiment sufficiently maintains the contact state between the mountain-shaped protrusion 5 and the housing 100 by specifically specifying the above conditions, and when a misalignment occurs. Even so, the seal bead 6 does not completely fall off with respect to the housing 100. As a result, sufficient seal stability can be ensured.

Further, in the sealing device 1 of the present embodiment, the shape of the bulge of the mountain-shaped protrusion 5 of the seal bead 6 is represented by a curvature R, and the curvature R is the height H of the protrusion of the annular plate 2 of the mountain-shaped protrusion 5. It may be characterized by being specified in 1/3 or more of (see FIG. 7).

That is, it is possible to satisfy the condition of "curvature R> (1/3) x H" of the mountain-shaped protrusion. By satisfying such a condition, a wide range including the top portion 5a of the mountain-shaped protrusion 5 can be set. As a result, the contact range with the housing 100 is widened. As a result, by widening the contact range with the housing 100, it is possible to stabilize the contact state between the housing 100 and the mountain-shaped protrusion 5 that comes into contact with the housing 100 while deforming, and the sealing stability of the sealing device 1 is improved. Can be planned.

Further, as shown in FIGS. 5 to 7, the sealing device 1 of the present embodiment has another configuration, that is, an elastic spring 9 that further urges the tip of the lip portion of the lip portion 7 toward the inside of the through hole portion 4. It may have (corresponding to the elastic urging portion of the present invention) and an extended lip portion 10 further extended from the tip of the lip portion. Here, the extended lip portion 10 extends further in the axial direction side (vertical direction on the paper surface in FIG. 5) than the elastic spring 9.

By further having the structure of the elastic spring 9 and the extended lip portion 10, the sealing property of the sealing device 1 with respect to the outer surface 102a of the piping portion 102 can be further improved. As a result, the sealing stability of the sealing device 1 becomes even better.

As described above, the sealing device 1 of the present embodiment can improve the contact state with the housing 100 by having the mountain-shaped protrusion 5 having a mountain-shaped cross section on the seal bead 6. Further, by conditioning the relationship between the lip thickness T1 of the lip portion 7, the waist thickness T2 of the waist portion 8, and the plate end surface thickness T3, the sealing body 3 is deformed while maintaining sufficient strength. Ease can be ensured. This makes it possible to secure a good close contact with the piping portion 102.

In the sealing device 1 of the present embodiment, the one in which the long-axis tubular piping portion 102 (see the broken line in FIG. 5) is inserted through the opening 101 of the housing 100 is shown, but the present invention is not limited to this, and for example. , The piping portion may have a curved shape curved along the axial direction (not shown). Even in this case, there is a possibility that an eccentric state is formed between the axis C1 of the opening 101 and the axis (not shown) of the curved piping portion.

The sealing device of the present invention can be mainly used for automobile auxiliary parts such as plug tubes, or connection portions and joint portions in mechanical parts of other general industrial machines.

1: Sealing device 2: Circular plate 2a: Plate outer peripheral surface 2b: Convex portion 2c: Recessed portion 3: Seal body 4: Through hole portion 4a: Inner peripheral hole surface 5: Crest-shaped protrusion 5a: Top 6: Seal bead 7: Lip part 8: Lumbar part 9: Elastic spring (elastic urging part)
10: Extended lip portion 100: Housing 101: Opening 102: Piping portion 102a: Outer surface 103: Gap 104: Stopper members C1, C2: Axial center H: Protrusion height R: Curvature T1: Lip thickness T2 : Lumbar thickness T3: Plate end surface thickness

Claims (9)

A long-axis tubular piping portion to be inserted into the housing and the opening of the housing is arranged in a state where an eccentric state in which the positions of the axial centers do not match with each other can occur, and is formed between the opening and the piping portion. A sealing device for sealing gaps,
An annular plate with a through hole and
It is attached to at least one side of the annular plate, has a mountain-shaped cross-sectional shape in the front view direction orthogonal to the axial direction of the opening and the piping portion, and has a mountain-shaped protrusion that abuts with a part of the housing. It has a seal bead, a lip portion provided inside the hole of the through hole portion from the seal bead and capable of being in close contact with the outer surface of the piping portion, and a waist portion connecting between the seal bead and the lip portion. A sealing device including a seal bead, a lip portion, and a seal body in which the waist portion is integrally formed of the same material. At least one of the lip thickness of the lip portion in the front view direction and the waist thickness of the waist portion in the front view direction is
The sealing device according to claim 1, which is formed to be at least 2 mm or less. The thickness of the lip portion in the front view direction and the waist thickness of the waist portion in the front view direction are the same.
The sealing device according to claim 1, wherein the annular plate on which the seal bead is installed is formed thinner than the plate end surface thickness in the front view direction. The lip thickness and the waist thickness are
The sealing device according to claim 2 or 3, which is formed to have the same thickness. The chevron protrusion and the lip of the seal bead are
The sealing device according to any one of claims 1 to 4, which protrudes in the same direction with respect to the waist. The mountain-shaped protrusion is
The sealing device according to any one of claims 1 to 5, wherein the sealing device abuts on a part of the housing at a position inside the hole of the through hole portion with respect to the inner peripheral hole surface of the through hole portion. The lip part is
An elastic urging portion that further urges the tip of the lip portion toward the inside of the hole of the through hole portion, and an elastic urging portion.
The sealing device according to any one of claims 1 to 6, further comprising an extended lip portion extending from the tip of the lip portion. The mountain-shaped protrusion is
Formed with a given curvature,
The curvature is
The sealing device according to any one of claims 1 to 7, which is set to 1/3 or more of the height of the protrusion of the mountain-shaped protrusion. The piping part is
The sealing device according to any one of claims 1 to 8, which exhibits a curved shape.

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