JP2009115169A - Seal member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal member which securely seals a seal attachment part with heat resistance and durability enhanced. <P>SOLUTION: The seal member 2 disposed in a position around a high-temperature space includes: a main body 20 formed by a metal thin plate and provided with a roughly center part in a plain view being curved in a convex shape on one side; and a side part 21 provided with cross-sectional R-shaped continuous faces 24a and 24b along the edge part of the main body 20. When it is attached to a mounting hole 17 drilled in a cylinder block 10, it is pressed from a convex side face 20a of the main body 20, and the side part 21 is welded with pressure to the inner wall 17d of the mounting hole 17 in a biassing direction and also to the inner wall 17e of the mounting hole 17 in a direction orthogonal to the biassing direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a seal member technology, and more particularly to a seal member used when measuring a high temperature space such as a combustion chamber of an internal combustion engine.

  In an internal combustion engine, it is very important to grasp the temperature distribution in a combustion chamber (cylinder cylinder) that is a combustion space, the concentration of chemical species before and after combustion, and the like in order to clean exhaust gas and improve fuel efficiency. For example, in an internal combustion engine, controlling combustion characteristics such as ignition timing, combustion temperature, and combustion period is considered to reduce harmful substances in exhaust gas and improve fuel efficiency. It is known that the temperature changes depending on the temperature distribution.

  Conventionally, an apparatus configuration for directly observing the temperature distribution and exhaust gas concentration distribution in the combustion space and the combustion chamber has been proposed. For example, in Patent Document 1, as a device for measuring a temperature distribution in a measurement space, a light source device having an infrared light emitting unit that emits infrared light toward the measurement space, and a red light after passing through the measurement space. And a light receiving device having an infrared light receiving unit for receiving external light, and a configuration in which a light source device and a light receiving device are disposed outside the combustion chamber of the internal combustion engine as a measurement space and at opposed positions. (See Patent Document 1).

  As described above, a measurement device for measuring a temperature distribution or the like in a measurement space (combustion space) is usually configured to project and receive irradiation light by a light source device or the like disposed outside the combustion chamber. . For this reason, a translucent lens member is disposed on the outer wall of the internal combustion engine to transmit the irradiation light from the light source device and introduce it into the measurement space. The lens member is closely closed through a seal member so that the outer wall of the internal combustion engine and the exhaust gas in the combustion chamber do not leak outside.

  By the way, since the seal member used when attaching the lens member described above is provided in the vicinity of or facing the measurement space that is at a high temperature, it is a material / shape that does not damage the lens member, and has heat resistance. It is required to have durability. As a conventional sealing member, a sheet-like member formed of a fluorine-based resin, a metal thin plate such as copper formed in a flat plate shape, or the like has been used.

  However, a member formed of a fluororesin is inferior in heat resistance and cannot be used for a long time. In particular, when a resin-molded sealing member is used, for example, as disclosed in Patent Document 2, the sealing member may be molded from a heat-resistant resin containing ultrahigh molecular weight polyethylene having a viscosity average molecular weight of 1,000,000 or more. Although the measurement space of the internal combustion engine has been proposed to have a higher indoor temperature, even if the sealing member is molded with a resin having the composition disclosed in the patent document, the stability in the high temperature state and Inferior in reliability.

In addition, a member formed of a thin metal plate has higher heat resistance than a resin molded member, but there is a problem that the sealability deteriorates due to thermal deformation due to long-time use. That is, as a sealing member disposed in the measurement space of the internal combustion engine, a member formed of a metal thin plate is preferable in terms of heat resistance than a member formed of resin, but thermal deformation is sealed with a conventional member. This has a problem in terms of durability because of its large influence on the properties.
JP 2005-164453 A JP 200222019 A

  Accordingly, the present invention relates to a seal member that solves the above-described conventional problems, and has an object to provide a seal member that improves heat resistance and durability and can reliably seal a seal mounting site. And

  The problems to be solved by the present invention are as described above. Next, means for solving the problems will be described.

  That is, in claim 1, the seal member is disposed in the vicinity of the high-temperature space, and is formed of a metal thin plate, and a main body having a substantially central portion curved in a convex shape on one side in a plan view. And a side part formed with a continuous surface having a R-shaped cross section along the edge of the main body part, and when being attached to a seal attachment site, pressed from the convex side surface of the main body part, The side portion is pressed against the seal mounting portion in the pressing direction and is pressed into the seal mounting portion in a direction orthogonal to the pressing direction.

  In Claim 2, the said side part is formed so that the edge part of a main-body part may bend | fold so that it may curve toward the concave side surface of this main-body part, and the 1st contact surface opposed in the direction of the concave-side surface of a main-body part And a second contact surface facing the side of the main body.

  According to a third aspect of the present invention, the main body portion is formed in a substantially rectangular shape in plan view, and the side portions are respectively provided at a pair of opposing edge portions of the main body portion.

  According to a fourth aspect of the present invention, the main body portion is formed in a substantially circular shape in plan view, and the side portion is provided along a circumferential direction of an edge portion of the main body portion.

  As effects of the present invention, the following effects can be obtained.

  Since it was set as the structure shown in Claim 1, heat resistance and durability can be improved and a seal attachment site | part can be sealed reliably.

  In Claim 2, when it is attached to the seal attachment part, the first contact surface is pressed against the seal attachment part opposed to the pressing direction by being pressed from the convex side surface of the main body part, and the second Since the contact surface is in pressure contact with the seal attachment portion facing the direction orthogonal to the pressing direction, the sealing effect of the seal attachment portion can be improved.

  According to the third aspect, it is possible to reliably seal the seal mounting portion with a simple configuration.

  According to the fourth aspect of the present invention, it is possible to improve the stability of the sealing effect of the seal attachment portion by uniformly distributing the stress to the seal attachment portion.

Next, the best mode for carrying out the invention will be described.
FIG. 1 is a schematic view showing an overall configuration of an internal combustion engine using a seal member according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a seal member and a lens member attached to an attachment hole, and FIG. FIG. 4 is a plan view of the seal member, FIG. 5 is a cross-sectional view showing the mounting state of the seal member, FIG. 6 is a partially enlarged cross-sectional view of FIG. 5, and FIG. Sectional drawing and FIG. 8 are top views of the sealing member of another Example.

First, the overall configuration of the internal combustion engine 1 in which the seal member 2 of the present embodiment is used will be outlined below. The seal member 2 according to the present embodiment is attached to an attachment hole 17 as a seal attachment portion that is formed at a position outside the cylinder cylinder 11 provided in the cylinder block 10 of the internal combustion engine 1.
As shown in FIG. 1, the internal combustion engine 1 includes an intake port 13 (intake manifold), an exhaust port 14 (exhaust manifold), and a spark plug 15 in a combustion chamber 12 formed in an upper space of a cylinder cylinder 11. A piston 16 is disposed in the cylinder cylinder 11 so as to be capable of reciprocating in the vertical direction along the cylinder cylinder 11. The intake port 13 is connected to a port injection valve 13a that injects and supplies fuel into the port.

  In the internal combustion engine 1, the fuel injected from the port injection valve 13 a forms an air-fuel mixture with the air supplied to the intake port 13, and this air-fuel mixture passes through an intake valve (not shown) at the end of the intake port 13. The combustion chamber 12 is filled from the exhaust port 14. Then, the air-fuel mixture in the combustion chamber 12 compressed by the rise of the piston 16 is ignited and burned by the spark plug 15, and the piston 16 reciprocates due to the combustion pressure of this air-fuel mixture. The air-fuel mixture after combustion is discharged as exhaust gas from the combustion chamber 12 to the exhaust port 14 via an exhaust valve (not shown) at the end of the exhaust port 14. The piston 16 repeats the reciprocating motion in this manner, so that the reciprocating motion of the piston 16 is converted into a rotational motion and then taken out as an output of the internal combustion engine 1.

  A space temperature measuring device 3 for measuring a temperature distribution in the combustion chamber 12 is connected to the internal combustion engine 1 of the present embodiment. Since the space temperature measuring device 3 can adopt a known configuration, a detailed description thereof is omitted, but in the present embodiment, the space temperature measuring device 3 is located outside the cylinder cylinder 11 in the combustion chamber 12. A light source device 30 having an infrared light emitting portion for emitting infrared light toward the light source, a light receiving device 31 having an infrared light receiving portion for receiving infrared light after passing through the combustion chamber 12, and infrared light. And a control device 32 for performing light projection control and light reception signal analysis. The control device 32 is connected to the intake valves and exhaust valves described above, and each intake valve and exhaust valve is controlled to open and close when the temperature distribution is measured.

  In the space temperature measuring device 3 described above, the light source device 30 and the light receiving device 31 are arranged at positions opposite to and outside the cylinder cylinder 11, and the infrared light irradiated from the light source device 30 into the combustion chamber 12 is received by the light receiving device. By receiving light at 31, the temperature distribution in the combustion chamber 12 is detected from the signal received by the light receiving device 31. Therefore, on the outer wall of the cylinder block 10 of the internal combustion engine 1 of the present embodiment, the irradiation light from the light source device 30 described above is transmitted and introduced into the combustion chamber 12, and the transmitted light transmitted through the combustion chamber 12 is combusted. Translucent lens members 4 and 4 for being led out of the chamber 12 are respectively attached.

  As shown in FIGS. 1 and 2, the lens member 4 is formed of a material that transmits infrared light, such as quartz glass or sapphire glass, and is located outside the cylinder cylinder 11 and on the outer wall of the cylinder block 10. Installed in place. In this embodiment, the lens member 4 is closed via the seal member 2 so that the exhaust gas in the cylinder cylinder 11 and the combustion chamber 12 does not leak to the mounting hole 17 formed in the outer wall of the cylinder block 10. Installed in close contact.

  The mounting hole 17 is drilled from the outer side of the cylinder block 10 toward the inner diameter direction of the cylinder cylinder 11 so as to penetrate the inner space and the outer space of the cylinder cylinder 11. A rib portion 17 c protrudes in the diameter reducing direction from the opening portion 17 a on the inner space side of the mounting hole 17. In the mounting hole 17, the opening portion 17 a on the inner space side of the cylinder tube 11 is formed on the cylinder tube 11. The aperture is formed to be smaller than the opening 17b on the external space side.

  The lens member 4 is formed in a shape that can be in close contact with the inner wall 17 d in the circumferential direction of the mounting hole 17, and is inserted from the opening 17 b on the outer space side of the mounting hole 17. The lens member 4 is positioned by contacting one end face 4a facing the inner space of the cylinder tube 11 with the rib portion 17c described above (via the seal member 2). In addition, the lens member 4 is inserted into the mounting hole 17, and the other end surface 4 b is pressed in the insertion direction by the flat pressing member 18 from the outside of the cylinder block 10. It is fixed by fastening with fixing bolts 19 and 19 to the outer wall.

  In the lens member 4 of the present embodiment, a protrusion 40 is formed on the end surface 4 a, and the protrusion 40 is fitted into the opening 17 a on the inner space side while being fixed to the mounting hole 17. Thus, the lens member 4 is disposed so as to face the inside of the cylinder cylinder 11 by fitting the projection 40 to the opening 17a, so that the light source device is connected to the space temperature measuring device 3 described above. The infrared light irradiated from 30 into the combustion chamber 12 can be reliably received by the light receiving device 31.

Next, the configuration of the seal member 2 of the present embodiment will be described in detail below.
As shown in FIGS. 2 to 4, the seal member 2 is interposed between the lens member 4 in the mounting hole 17 formed in the cylinder block 10, so that the mounting hole 17 is closed. Sealed, the internal space of the cylinder cylinder 11 is blocked from the external space.

  The seal member 2 of the present embodiment is formed of a metal thin plate, is formed in a substantially rectangular shape in plan view, and is curved and formed so that a substantially central portion in plan view is convex on one side. And side portions 21 formed along the edge portions 22 and 23 of the main body portion 20.

  As the material of the seal member 2, a metal material such as aluminum or copper is used, and a copper material having a relatively low hardness is preferably used. Thus, by using a metal material, heat resistance can be ensured and, as will be described later, even when the seal member 2 is pressed by the lens member 4, the lens member is appropriately elasticized. Sealing properties can be ensured while preventing damage to 4.

  The main body portion 20 is formed in a substantially rectangular shape in plan view, and is formed so that a substantially central portion is curved in a convex shape on one side. Specifically, a pair of opposed edge portions 22 and 22 and an edge portion 23. 23 (side portions 21, 21) are curved in directions approaching each other, and a substantially central portion is formed so as to protrude in one direction. The main body 20 includes a convex side surface 20a in which a substantially central portion in a plan view is projected with respect to the edge portions 22 and 23, and a concave side surface in which the substantially central portion is similarly recessed with respect to the edge portions 22 and 23. 20b.

  In addition, the surface roughness of the convex side surface 20a of the main body 20 serving as a pressure contact surface with the lens member 4 is adjusted so that the lens member 4 is not damaged. Preferably, the main body 20 is made of a material adjusted so that the surface roughness of the convex side surface 20a is 5 μm or less.

  Further, the main body portion 20 has a through hole 20c formed in a substantially central portion, and the projection portion 40 of the lens member 4 is inserted into the through hole 20c in a state where the lens member 4 is attached to the attachment hole 17. The Therefore, the inner diameter of the through hole 20c is adjusted to be slightly larger than the size of the protrusion 40 of the lens member 4. Thus, by providing the through hole 20c in the main body 20, even when the main body 20 is attached to the attachment hole 17, the lead-out of the laser light to the lens member 4 is not hindered.

The side portion 21 is continuously formed over the entire circumference of each of the edge portions 22 and 23 of the main body portion 20 described above, and a continuous surface 24 having a R-shaped cross section is formed along each of the edge portions 22 and 23. Has been. Specifically, the side portion 21 of the present embodiment is formed by being folded (curled) so that the end surfaces of the edge portions 22 and 23 of the main body portion 20 are curved toward the concave side surface 20b. In a state in which the seal member 2 is attached to the attachment hole 17, the side portion 21 is pressed in a state of being elastically deformed by the inner walls 17 d and 17 e of the attachment hole 17 and the lens member 4.
Further, the side portion 21 is chamfered in an R shape at a corner corresponding to the corner portion of the main body portion 20 in a plan view, and the main body portion 20 and the side portion 21 are elastically deformed when the seal member 2 is pressed. The mounting hole 17 (inner walls 17d and 17e thereof) is configured in a shape that can be securely pressed.

  The continuous surface 24 of the side portion 21 is opposed to the first contact surface 24a which is the tip portion of the side portion 21 and faces the concave side surface 20b of the main body 20 and the side of the main body 20 in a sectional view. The second contact surface 24b is formed. That is, the continuous surface 24 constitutes the outer surface of the side portion 21 and is continuous with the convex side surface 20 a and the concave side surface 20 b of the main body portion 20.

Next, the attachment state of the seal member 2 to the attachment hole 17 will be described in detail below.
As shown in FIGS. 2, 5, and 6, the seal member 2 according to the present embodiment is provided with the inner walls 17 d and 17 e of the mounting hole 17 in the mounting hole 17 formed so as to penetrate the outer wall of the cylinder block 10. And the lens member 4 are attached in pressure contact. By mounting in this way, the mounting hole 17 is tightly sealed, and the exhaust gas in the cylinder cylinder 11 can be prevented from leaking outside.

  When the seal member 2 is attached to the attachment hole 17, first, the seal member 2 is inserted into the attachment hole 17 in a state where the front is opposed to the inner part of the attachment hole 17, that is, the concave side surface 20b is opposed. Is done. The seal member 2 inserted into the mounting hole 17 is positioned in a state where it is in contact with the rib portion 17 c formed in the mounting hole 17. Here, an inner wall 17d formed in the circumferential direction from the opening 17a to the opening 17b and an inner wall 17e formed on the inner surface of the rib portion 17c are formed inside the mounting hole 17, and the seal The member 2 is positioned in a state in which the first contact surface 24a of the side portion 21 is in contact with the inner wall 17e by line contact at the contact P1.

  Next, the lens member 4 is inserted into the mounting hole 17 in which the seal member 2 is inserted in a state in which the protruding portion 40 of the end surface 4a is opposed to the back of the mounting hole 17. The lens member 4 inserted into the mounting hole 17 is finally inserted into the through hole 20c of the seal member 2 positioned at the innermost part of the mounting hole 17, and the end surface 4a is connected to the convex side surface 20a of the main body portion 20. Contact is made by line contact at the contact P2. As the lens member 4 is inserted into the mounting hole 17, the seal member 2 is gradually pressed from the convex side surface 20 a of the main body 20 by the lens member 4 (the end surface 4 a thereof). The pressing direction of the sealing member 2 by the lens member 4 is hereinafter referred to as “pressing direction” (the arrow direction in FIGS. 5 and 6).

  When the seal member 2 is pressed by the lens member 4, a load is gradually applied to the main body portion 20 and the side portion 21 and elastically deforms. That is, the seal member 2 is gradually elastically deformed from the substantially central portion so that the main body portion 20 is pressed from the convex side surface 20a toward the pressing direction of the lens member 4 and is substantially flat when viewed from the side, and eventually the end surface 4a. And the convex side surface 20a are interviewed. Further, the seal member 2 is gradually elastically deformed so that the side portion 21 spreads outward in a direction orthogonal to the pressing direction of the lens member 4, and the inner wall 17d of the mounting hole 17 is formed on the second contact surface 24b. And contact P3 by line contact.

  In this state, the seal member 2 is subjected to the stress F1 from the inner wall 17e so that the first contact surface 24a of the side portion 21 is directed in the direction opposite to the pressing direction at the contact P1, and the second contact surface 24b is pressed at the contact P3. A stress F3 from the inner wall 17d is applied in a direction orthogonal to the direction. The seal member 2 is subjected to the stress F <b> 2 by the surface pressure from the end surface 4 a of the lens member 4 so that the convex side surface 20 a of the main body portion 20 is directed in the pressing direction. And the sealing member 2 of a present Example is the inner wall 17d * of the attachment hole 17 in each contact P1-P3, when an elastic force acts in the direction which cancels each stress F1-F3 in the main-body part 20 and the side part 21. 17e and the end surface 4a of the lens member 4 are pressure-contacted, and the attachment hole 17 is sealed tightly.

  The lens member 4 inserted into the mounting hole 17 is positioned and fixed by being inserted into the opening portion 17b opened in the rib portion 17c in a state where the lens member 4 is pressed in the pressing direction by the pressing member 18 described above. The

  As described above, the seal member 2 of the present embodiment is a seal member 2 disposed in the vicinity of the high-temperature space, and is formed of a thin metal plate, and has a substantially central portion curved in a convex shape in plan view. A body part 20 formed and a side part 21 in which a continuous surface 24 having a R-shaped cross section is formed along the edge parts 22 and 23 of the body part 20, and is attached to the cylinder block 10. When attached to the hole 17, it is pressed from the convex side surface 20 a of the main body part 20, and the side part 21 is pressed against the inner wall 17 d of the attachment hole 17 toward the pressing direction, and in a direction orthogonal to the pressing direction. Since it is configured to be in pressure contact with the inner wall 17e of the mounting hole 17, the heat resistance and durability can be improved and the mounting hole 17 can be reliably sealed.

That is, the sealing member 2 of the present embodiment is formed such that the main body portion 20 is formed of a metal thin plate so that the substantially central portion in a plan view is curved in a convex shape on one side. And can be used in the vicinity of the cylinder cylinder 11 which is a high-temperature space.
In addition, in the sealing member 2, in addition to the main body 20 being curvedly formed in a substantially central portion in plan view, a continuous surface 24 having a R-shaped cross section is formed along the edges 22 and 23 of the main body 20. By providing the side portion 21, the main body portion 20 and the side portion 21 are elastically deformed and pressed against the inner walls 17 d and 17 e of the attachment hole 17 when pressed by the lens member 4 when attached to the attachment hole 17. Therefore, the mounting hole 17 can be sealed tightly, and the mounting hole 17 can be reliably sealed. Further, since the seal member 2 of this embodiment is pressed against the inner walls 17d and 17e of the mounting hole 17 by being elastically deformed, it is possible to reduce the influence of thermal deformation on the sealing performance. It is particularly excellent in terms of durability.

  In particular, the sealing member 2 of the present embodiment is formed by folding the side portion 21 so that the edge portions 22 and 23 of the main body portion 20 are curved toward the concave side surface 20b, and in the direction of the concave side surface 20b of the main body portion 20. Since the first contact surface 24a opposed to the second contact surface 24b and the second contact surface 24b opposed to the side of the main body portion 20 are formed, the convex side surface 20a of the main body portion 20 when attached to the attachment hole 17 is formed. The first contact surface 24a is pressed against the inner wall 17e of the mounting hole 17 facing the pressing direction, and the second contact surface faces the direction orthogonal to the pressing direction. Therefore, the sealing effect of the mounting hole 17 can be further improved.

  In addition, as a structure of the sealing member 2 of a present Example, it is not limited to the Example mentioned above.

That is, the sealing member 2 of the above-described embodiment includes the main body portion 20 formed in a substantially rectangular shape in plan view, the side portions 21 formed in the opposite edge portions 22 and 23 of the main body portion 20, and the like. However, the shape of the seal member 2 is not limited to this.
For example, the seal member 102 of the embodiment shown in FIGS. 7 and 8 includes a main body portion 120 formed in a substantially circular shape in plan view, and a side portion 121 provided along the circumferential direction of the edge portion 122 of the main body portion 120. Etc. The main body portion 120 is a metal thin plate formed in a substantially circular shape in plan view, and has a substantially central portion curved in a convex shape on one side in a plan view, and the side portion 121 is an outer peripheral edge portion of the main body portion 120. A continuous surface 124 having a R-shaped cross section is formed along 122. The continuous surface 124 includes a first contact surface 124a and a second contact surface 124b. When the seal member 102 of this embodiment is used, the mounting hole 17 is drilled so as to have a substantially circular cross section.

  As in the above-described embodiment (see FIGS. 3 and 4), the main body portion 20 is formed in a substantially rectangular shape in plan view, and the side portion 21 is at least paired with the pair of opposite edge portions 22 and 23 of the main body portion 20. By providing, the mounting hole 17 can be reliably sealed with a simple configuration. On the other hand, as in the above-described another embodiment (see FIGS. 7 and 8), the main body 120 is formed in a substantially circular shape in plan view, and the side portion 121 is along the circumferential direction of the edge 122 of the main body 120. Thus, the stress on the inner walls 17d and 17e of the mounting hole 17 by the contact surfaces 124a and 124b can be evenly distributed, and the stability of the sealing effect of the mounting hole 17 can be improved.

  Further, if the seal member 2 of the present embodiment is located in the vicinity of the high-temperature space, for example, in addition to being attached to the cylinder block 10 described above, measurement of an internal combustion engine (engine) using other optical systems, When observing the inside of the internal combustion engine, it can be attached to a predetermined place as appropriate. In this case, the seal attachment portion can be provided at a predetermined position of the cylinder head of the internal combustion engine, a predetermined position of the exhaust path connected to the internal combustion engine, or the like.

  In the above-described embodiment, the lens member 4 is fixed by the pressing member 18 (see FIG. 2). However, the method for fixing the lens member 4 is not limited to this. You may make it fix directly by screwing. Further, the shape of the lens member 4 is not particularly limited.

  In the above-described embodiment, when the seal member 2 is attached to the attachment hole 17, the lens member 4 is first inserted in a state where the seal member 2 is first inserted into the attachment hole 17 (see FIG. 5). ) The method of attaching the seal member 2 is not limited to this. For example, the seal member 2 may be attached to the attachment hole 17 in a state where the through hole 20c of the seal member 2 is inserted into the protrusion 40 of the lens member 4 and the seal member 2 and the lens member 4 are assembled together. .

BRIEF DESCRIPTION OF THE DRAWINGS Schematic which showed the whole structure of the internal combustion engine using the sealing member based on one Example of this invention. Sectional drawing of the sealing member and lens member which were attached to the attachment hole. Sectional drawing of a sealing member. The top view of a sealing member. Sectional drawing which shows the attachment state of a sealing member. Similarly, the partial expanded sectional view of FIG. Sectional drawing of the sealing member of another Example. The top view of the sealing member of another Example.

Explanation of symbols

2 Seal member 4 Lens member 10 Cylinder block 11 Cylinder cylinder 17 Mounting hole (seal mounting site)
17d inner wall 17e inner wall 20 body 20a convex side 20b concave side 21 side 22 edge 23 edge 24 continuous surface 24a first contact surface 24b second contact surface

Claims (4)

A seal member disposed in the vicinity of the high-temperature space,
A main body formed from a thin metal plate and having a substantially central portion curved in a convex shape on one side in plan view;
A side portion having a continuous surface having a R-shaped cross section formed along an edge of the main body portion;
When attached to the seal attachment site, it is pressed from the convex side surface of the main body, and the side portion is pressed against the seal installation site toward the pressing direction and the seal is mounted toward the direction orthogonal to the pressing direction. A seal member, wherein the seal member is pressed against a part.   The side portion is formed by bending the edge of the main body portion so as to bend toward the concave side surface of the main body portion, the first contact surface facing the concave side surface of the main body portion, and the side of the main body portion The seal member according to claim 1, further comprising a second contact surface facing the side.   3. The seal member according to claim 1, wherein the main body portion is formed in a substantially rectangular shape in plan view, and the side portions are respectively provided at a pair of opposite edge portions of the main body portion.   3. The seal member according to claim 1, wherein the main body portion is formed in a substantially circular shape in plan view, and the side portion is provided along a circumferential direction of an edge portion of the main body portion. .

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