JP2024014506A - Sealing device, how to install the sealing device, and how to remove the sealing device - Google Patents

Abstract

The present invention provides a sealing device, a method for attaching the sealing device, and a method for removing the sealing device, which prevent the sealing device from coming off from the through-hole and improve the workability of removing the sealing device from the through-hole. A sealing device that closes a through hole 310 is press-fitted into the through hole 310 and configured such that the outer peripheral surface of a cylindrical portion 110 is in close contact with the inner peripheral surface of the through hole 310. The sealing device main body 100 has a cylindrical shape with a bottom, and is inserted through the opening of the cylindrical portion 110 to fit onto the inner circumferential surface of the cylindrical portion 110 and press the cylindrical portion 110 toward the outer circumferential surface. The reinforcing member 200 is configured to be able to assume a fitted state and a non-fitted state in which the pressure on the cylindrical portion 110 is released by shifting from the fitted state. [Selection diagram] Figure 3

Description

The present invention relates to a sealing device, a method of attaching a sealing device, and a method of removing a sealing device.

2. Description of the Related Art Conventionally, sealing devices for closing through holes provided in housings and the like that house various components have been known. FIG. 9 is a schematic cross-sectional view showing a state in which a conventional sealing device is used. The sealing device 600 is a bottomed cylindrical member having a cylindrical portion 610 and a bottom portion 620. The sealing device 600 configured in this manner is press-fitted into the through hole 310 provided in the housing 300. As a result, the outer circumferential surface of the cylindrical portion 610 comes into close contact with the inner circumferential surface of the through hole 310, so that the through hole 310 is closed.

Here, depending on the usage environment, the internal pressure of the housing 300 may become high. In this case, it is necessary to increase the pressing force of the sealing device 600 against the through hole 310. On the other hand, depending on the usage environment, it may be necessary to remove the sealing device 600 from the through hole 310 for maintenance or the like. In this case, the higher the pressing force is, the more difficult it becomes to remove the sealing device 600.

Japanese Patent Application Publication No. 2008-196553

An object of the present invention is to provide a sealing device, a method for attaching the sealing device, and a method for removing the sealing device, which are difficult to remove from the through-hole and can improve the workability of removing the sealing device from the through-hole.

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

The sealing device of the present invention includes:
A sealing device for closing a through hole,
a bottomed cylindrical sealing device main body that is press-fitted into the through hole and configured such that the outer peripheral surface of the cylindrical portion is in close contact with the inner peripheral surface of the through hole;
a fitted state in which the cylindrical part is inserted through the opening of the cylindrical part and is fitted onto the inner circumferential surface of the cylindrical part and presses the cylindrical part toward the outer circumferential surface; and a position in the fitted state. a reinforcing member configured to be able to assume an unfitted state in which the reinforcing member deviates from the cylindrical portion and releases pressure on the cylindrical portion;
It is characterized by having the following.

According to the present invention, when the reinforcing member is fitted into the cylindrical portion of the sealing device main body, the cylindrical portion is pressed toward the outer circumferential surface, so that the sealing device is firmly fixed to the through hole. be able to. Furthermore, by placing the reinforcing member in the unfitted state, the pressure exerted by the reinforcing member on the cylindrical portion is released, thereby making it possible to reduce the fixing force of the cylindrical portion to the through hole.

The reinforcing member may include a cylindrical fitting portion that is fitted into an inner circumferential surface of the cylindrical portion.

Further, the reinforcing member may include a protruding portion that protrudes radially inward from the fitting portion.

Thereby, the reinforcing member can be easily removed from the sealing device main body because the tool can be removed while being hooked on the protrusion.

The protrusion may be an inward flange.

Further, the cylindrical part is
a small cylinder part arranged on the opening side and into which the reinforcing member is fitted;
a large cylindrical portion disposed on the bottom side of the opening and having an inner diameter larger than the inner diameter of the small cylindrical portion;
It is also suitable to have.

If such a configuration is adopted, the reinforcing member fitted into the small cylindrical portion is pushed in and accommodated in the large cylindrical portion, thereby making it possible to release the pressure on the cylindrical portion by the reinforcing member.

Further, the reinforcing member is preferably a disc-shaped member.

Furthermore, the method for installing the sealing device of the present invention is as follows:
Pressing into the through hole a bottomed cylindrical sealing device body configured such that the outer peripheral surface of the cylindrical portion is in close contact with the inner peripheral surface of the through hole;
It is configured to have a fitted state in which the cylindrical portion is pressed toward the outer circumferential surface, and a non-fitted state in which the cylindrical portion is released from the position of the fitted state. a step of fitting a reinforcing member to an inner circumferential surface of the cylindrical portion by inserting it through an opening of the cylindrical portion;
It is characterized by having the following.

Further, the method for removing the sealing device of the present invention is as follows:
A method for removing a sealing device attached to the through hole by the above-mentioned sealing device attachment method, comprising:
The reinforcing member has a cylindrical fitting part that fits into the inner peripheral surface of the cylindrical part,
hooking a tool on a part of the reinforcing member to remove the reinforcing member from the cylindrical part;
pulling out the sealing device main body from the through hole;
It is characterized by having the following.

The reinforcing member includes a protruding part that protrudes radially inward from the fitting part, and the tool is hooked onto the protruding part or an end of the fitting part to insert the reinforcing member into the cylindrical shape. It is best to remove it from the section.

Furthermore, the method for removing the sealing device of the present invention includes:
A method for removing a sealing device attached to the through hole by the above-mentioned sealing device attachment method, comprising:
The cylindrical portion includes a small cylindrical portion that is disposed on the opening side and into which the reinforcing member is fitted, and a small cylindrical portion that is disposed on the bottom side of the opening and whose inner diameter is smaller than the inner diameter of the small cylindrical portion. has a large large cylinder part,
a step of pushing the reinforcing member fitted into the small cylindrical portion and housing it in the large cylindrical portion;
pulling out the sealing device main body from the through hole;
It is characterized by having the following.

Note that each of the above configurations may be employed in combination as much as possible.

As explained above, according to the present invention, the sealing device can be made difficult to come off from the through hole, and the workability of removing the sealing device from the through hole can be improved.

FIG. 1 is a plan view of a sealing device according to Example 1 of the present invention. FIG. 2 is a schematic cross-sectional view of a sealing device according to Example 1 of the present invention. FIG. 3 is an explanatory diagram of a method of attaching the sealing device according to the first embodiment of the present invention. FIG. 4 is an explanatory diagram of a method for removing the sealing device according to the first embodiment of the present invention. FIG. 5 is a plan view of a sealing device according to Example 2 of the present invention. FIG. 6 is a schematic cross-sectional view of a sealing device according to Example 2 of the present invention. FIG. 7 is an explanatory diagram of a method of attaching a sealing device according to a second embodiment of the present invention. FIG. 8 is an explanatory diagram of a method for removing a sealing device according to a second embodiment of the present invention. FIG. 9 is a schematic cross-sectional view showing a state in which a conventional sealing device is used.

EMBODIMENT OF THE INVENTION Below, with reference to drawings, the form for implementing this invention is illustratively described in detail based on an Example. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in this example are not intended to limit the scope of this invention to only those, unless otherwise specified. . The sealing device shown below can be suitably used for closing a through hole provided in a housing that accommodates these parts in a device such as an E-Axle that includes parts such as gears and motors. In particular, in the E-Axle, since it is necessary to remove the sealing device for maintenance or the like, the sealing device of the present invention can be suitably used. However, the sealing device of the present invention is not limited to such devices, and can be used to close through holes provided in housings and the like in various devices. In particular, the sealing device of the present invention can be suitably used in an environment where the internal pressure of the housing is high and it is necessary to remove the sealing device from the through hole during maintenance of the device.

(Example 1)
Embodiment 1 A sealing device, a method for attaching the sealing device, and a method for removing the sealing device according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a plan view of a sealing device according to Example 1 of the present invention. FIG. 2 is a schematic sectional view of the sealing device according to Example 1 of the present invention, and corresponds to the AA sectional view in FIG. FIG. 3 is an explanatory diagram of the method of attaching the sealing device according to the first embodiment of the present invention, and is a diagram of the process of attaching the sealing device. Note that in FIG. 3, various members are shown in schematic cross-sectional views. FIG. 4 is an explanatory view of the method for removing the sealing device according to the first embodiment of the present invention, and is a process diagram for removing the sealing device. Note that, in FIG. 4, various members are shown in schematic cross-sectional views.

<Sealing device>
The configuration of a sealing device 10 according to this embodiment will be described with reference to FIGS. 1 and 2. The sealing device 10 includes a sealing device main body 100 and a reinforcing member 200. The sealing device main body 100 is a bottomed cylindrical member having a cylindrical portion 110 and a bottom portion 120. The reinforcing member 200 includes a cylindrical fitting part 210 and an inward flange part 220 as a protruding part that projects radially inward from the fitting part 210. The sealing device main body 100 and the reinforcing member 200 are made of a highly rigid material such as metal.

<How to install the sealing device>
A method for attaching the sealing device 10 according to this embodiment will be described with reference to FIG. 3. The sealing device 10 according to this embodiment is used to close the through hole 310 by being attached to the through hole 310 provided in the housing 300. The sealing device main body 100 according to this embodiment is press-fitted into the through hole 310 and is configured such that the outer peripheral surface of the cylindrical portion 110 is in close contact with the inner peripheral surface of the through hole 310. In this embodiment, the inner circumferential surface of the through hole 310 is constituted by a cylindrical surface, and the cylindrical portion 110 is constituted by a cylindrical portion. Here, the outer diameter of the cylindrical portion 110 is configured to be larger than the inner diameter of the through hole 310. Note that a tapered surface 311 is provided at the end of the through hole 310 to facilitate press-fitting of the sealing device main body 100.

In the process of attaching the sealing device 10, first, the sealing device main body 100 configured as described above is press-fitted into the through hole 310. 3(a) shows the state immediately before the sealing device main body 100 is press-fitted, and FIG. 3(b) shows the state after the sealing device main body 100 is press-fitted. Note that in FIG. 3, the lower side is the inside of the housing 300 (the inside of the device).

When only the sealing device main body 100 is press-fitted into the through hole 310, the fixing force (pressing force) of the sealing device main body 100 to the through hole 310 is relatively weak so that the sealing device main body 100 can be easily removed from the through hole 310. is set to . That is, the fitting allowance is set to be small.

The reinforcing member 200 is inserted through the opening of the cylindrical portion 110 of the sealing device main body 100 and is fitted to the inner circumferential surface of the cylindrical portion 110 . The reinforcing member 200 has two states: a fitted state in which the cylindrical portion 110 is pressed toward the outer peripheral surface, and a non-fitted state in which the reinforcing member 200 is shifted from the fitted state and releases the pressure on the cylindrical portion 110. It is structured so that it can be taken. The reinforcing member 200 also includes a cylindrical fitting part 210 that is fitted into the inner circumferential surface of the cylindrical part 110, and an inward flange part as a protruding part that protrudes radially inward from the fitting part 210. 220. The fitting portion 210 of the reinforcing member 200 is constituted by a cylindrical portion. The outer diameter of the fitting part 210 is configured to be larger than the inner diameter of the cylindrical part 110. Thereby, the fitting portion 210 can press the cylindrical portion 110 substantially uniformly toward the outer peripheral surface over the entire circumference. Note that a tapered surface 211 is provided on the distal end side of the outer peripheral surface of the fitting part 210 so that it can be easily inserted into the cylindrical part 110. In this embodiment, a case where the tapered surface 211 is employed is shown, but in order to make it easier to insert the fitting part 210 into the cylindrical part 110, any tapered sloped surface is not limited to the tapered surface. , it may be constructed with an inclined surface that becomes a curve when viewed in cross section.

After the sealing device main body 100 is press-fitted into the through hole 310, the reinforcing member 200 configured as described above is inserted through the opening of the cylindrical portion 110 and fitted onto the inner circumferential surface of the cylindrical portion 110. . FIG. 3C shows the state immediately before the reinforcing member 200 is fitted, and FIG. 3D shows the state after the reinforcing member 200 is fitted.

When the reinforcing member 200 is fitted into the cylindrical portion 110, the fixing force (pressing force) to the through hole 310 of the sealing device main body 100 is set to be strong. That is, when the reinforcing member 200 is fitted into the cylindrical part 110, a force is applied that causes the cylindrical part 110 to expand toward the outer peripheral surface, so that the fitting allowance is set to become substantially large. ing.

<How to remove the sealing device>
With reference to FIG. 4, a method for removing the sealing device 10 according to this embodiment will be described. In this embodiment, a tool 400 for removing the reinforcing member 200 from the cylindrical portion 110 of the sealing device main body 100 is hooked on a part of the reinforcing member 200 (see FIG. 4(a)). In this case, the tool 400 can be hooked on the tip of the fitting portion 210, but in the case of this embodiment, it is easier to perform the work if it is hooked on the inward flange portion 220. Then, the reinforcing member 200 is removed from the sealing device main body 100 using the tool 400 using the principle of leverage (see FIG. 4(b)). By removing the reinforcing member 200 from the sealing device main body 100, the fixing force (pressing force) of the sealing device main body 100 to the through hole 310 decreases.

Thereafter, the sealing device main body 100 is pulled out from the through hole 310, thereby completing the removal work of the sealing device 10. Note that the same method as the conventional method can be used to pull out the sealing device main body 100 from the through hole 310. For example, it can be pulled out using a special jig. In this case, it is also possible to adopt a configuration in which the sealing device main body 100 is provided with a concave portion or a convex portion for hooking a special jig.

<Excellent points of the sealing device according to this embodiment>
According to the sealing device 10 according to the present embodiment, when the reinforcing member 200 is fitted into the cylindrical portion 110 of the sealing device main body 100, the cylindrical portion 110 is pressed toward the outer peripheral surface. The sealing device 10 can be firmly fixed to the through hole 310. Thereby, even in a usage environment where the internal pressure of the housing 300 is high, it is possible to prevent the sealing device 10 from falling out of the through hole 310.

In addition, in this embodiment, by placing the reinforcing member 200 in the unfitted state (in the case of this embodiment, removing the reinforcing member 200 from the sealing device main body 100), the pressure applied to the cylindrical portion 110 by the reinforcing member 200 is reduced. is canceled. Thereby, the fixing force of the cylindrical portion 110 to the through hole 310 can be reduced. Therefore, the sealing device main body 100 can be easily pulled out from the through hole 310. Therefore, the workability of removing the sealing device 10 from the through hole 310 can be improved.

In this embodiment, the reinforcing member 200 can be easily removed from the sealing device main body 100 while hooking the tool 400 on the protrusion (inward flange 220) of the reinforcing member 200. Furthermore, in this embodiment, since the pressing force on the through hole 310 of the sealing device main body 100 can be suppressed to a low level, the inner circumferential surface of the through hole 310 and the outer circumferential surface of the sealing device main body 100 can be prevented from being damaged. Can be suppressed.

In addition, in this example, the case where the protrusion part is comprised by the inward flange part 220 was shown. However, the protrusion provided to make it easier to hook the tool 400 is not limited to the inward flange. In other words, as long as the protruding portion protrudes radially inward from the fitting portion 210, a partially protruding portion may be adopted even if the protruding portion does not protrude over the entire circumference. You can also do it. Moreover, since the tool 400 can be hooked onto the tip of the fitting part 210, a reinforcing member without a protruding part can also be employed. That is, it is also possible to adopt a configuration in which the reinforcing member consists of only a cylindrical fitting portion.

(Example 2)
A sealing device, a method of attaching the sealing device, and a method of removing the sealing device according to a second embodiment of the present invention will be described with reference to FIGS. 5 to 8. FIG. 5 is a plan view of a sealing device according to Example 2 of the present invention. FIG. 6 is a schematic cross-sectional view of a sealing device according to Example 2 of the present invention, and corresponds to the BB cross-sectional view in FIG. FIG. 7 is an explanatory diagram of a method of attaching a sealing device according to a second embodiment of the present invention, and is a diagram of an attaching process of the sealing device. Note that, in FIG. 7, various members are shown in schematic cross-sectional views. FIG. 8 is an explanatory diagram of a method for removing a sealing device according to the second embodiment of the present invention, and is a diagram of a process for removing the sealing device. Note that, in FIG. 8, various members are shown in schematic cross-sectional views.

<Sealing device>
The configuration of the sealing device 10X according to this embodiment will be described with reference to FIGS. 5 and 6. The sealing device 10X includes a sealing device main body 100X and a reinforcing member 200X. The sealing device main body 100X is a bottomed cylindrical member having a cylindrical portion 110X and a bottom portion 120. The cylindrical part 110X according to this embodiment is arranged on the opening side opposite to the bottom part 120, and has a small cylindrical part 111 into which the reinforcing member 200X is fitted, and the small cylindrical part 111 is arranged on the bottom side of the opening and is reinforced. The member 200X integrally has a large cylindrical portion 112 that is housed inside the member 200X in a non-fitted state. The inner diameter of the large cylindrical portion 112 is larger than the inner diameter of the small cylindrical portion 111. The reinforcing member 200X is made of a disc-shaped member. The sealing device main body 100X and the reinforcing member 200X are made of a highly rigid material such as metal.

<How to install the sealing device>
With reference to FIG. 7, a method of attaching the sealing device 10X according to this embodiment will be described. The sealing device 10X according to this embodiment is used to close the through hole 310 by being attached to the through hole 310 provided in the housing 300. The sealing device main body 100X according to the present embodiment is press-fitted into the through hole 310 and is configured such that the outer peripheral surface of the large cylindrical portion 112 of the cylindrical portion 110X is in close contact with the inner peripheral surface of the through hole 310. There is. In this embodiment, the inner circumferential surface of the through hole 310 is constituted by a cylindrical surface, and the cylindrical portion 110X is constituted by a stepped cylindrical portion that integrally includes a small cylindrical portion 111 and a large cylindrical portion 112. has been done. Here, the outer diameter of the large cylinder portion 112 is configured to be larger than the inner diameter of the through hole 310. Note that a tapered surface 311 is provided at the end of the through hole 310 in order to facilitate press-fitting of the sealing device main body 100X.

In the process of attaching the sealing device 10X, first, the sealing device main body 100X configured as described above is press-fitted into the through hole 310. FIG. 7(a) shows the sealing device main body 100X just before press-fitting, and FIG. 7(b) shows the sealing device main body 100X after press-fitting. Note that in FIG. 7, the lower side is the inside of the housing 300 (the inside of the device).

When only the sealing device body 100X is press-fitted into the through hole 310, the fixing force (pressing force) of the sealing device body 100X to the through hole 310 is relatively weak so that the sealing device body 100X can be easily removed from the through hole 310. is set to . That is, the fitting allowance is set to be small.

The reinforcing member 200X is inserted through the opening of the cylindrical portion 110X of the sealing device main body 100X and is fitted to the inner peripheral surface of the small cylindrical portion 111 in the cylindrical portion 110X. The reinforcing member 200X has two states: a fitted state in which it presses the cylindrical portion 110X toward the outer peripheral surface, and a non-fitted state in which it deviates from the fitted state and releases the pressure on the cylindrical portion 110X. It is structured so that it can be taken. The reinforcing member 200X according to this embodiment is formed of a disc-shaped member. Further, the outer diameter of the reinforcing member 200X is configured to be larger than the inner diameter of the small cylindrical portion 111 in the cylindrical portion 110X. Note that a tapered surface 201 is provided on the distal end side of the outer peripheral surface of the reinforcing member 200X so that it can be easily inserted into the cylindrical portion 110X. In this embodiment, a case where the tapered surface 201 is employed is shown, but in order to make it easier to insert the reinforcing member 200X into the cylindrical portion 110X, any tapered sloped surface is not limited to the tapered surface. It may be configured with an inclined surface that is curved when viewed in cross section.

After the sealing device main body 100X is press-fitted into the through hole 310, the reinforcing member 200X configured as described above is inserted through the opening of the cylindrical portion 110X, and the inner peripheral surface of the small cylindrical portion 111 in the cylindrical portion 110X is mated to. FIG. 7(c) shows the reinforcing member 200X just before being fitted, and FIG. 7(d) shows the reinforcing member 200X after being fitted.

When the reinforcing member 200X is fitted into the small tube portion 111 of the cylindrical portion 110X, the fixing force (pressing force) to the through hole 310 of the sealing device main body 100X is set to be strong. That is, when the reinforcing member 200X is fitted into the small cylindrical part 111 of the cylindrical part 110X, a force is applied that causes the large cylindrical part 112 of the cylindrical part 110X to expand toward the outer circumferential surface side, thereby substantially preventing the fitting. It is set so that the yield is large.

<How to remove the sealing device>
With reference to FIG. 8, a method for removing the sealing device 10X according to this embodiment will be described. In this embodiment, the reinforcing member 200X is accommodated in the large tubular portion 112 by being pushed in the reinforcing member 200X that is fitted into the small tubular portion 111 of the tubular portion 110X. For example, by hitting the reinforcing member 200X with the hammer 500, the reinforcing member 200X can be accommodated in the large cylinder portion 112 (see FIG. 8). As a result, the fixing force (pressing force) of the sealing device main body 100X to the through hole 310 is reduced. Note that the outer diameter of the reinforcing member 200X is configured to be smaller than the inner diameter of the large cylindrical portion 112 in the cylindrical portion 110X.

Thereafter, the sealing device main body 100X is pulled out from the through hole 310, thereby completing the removal work of the sealing device 10X. Note that the same method as the conventional method can be used to pull out the sealing device main body 100X from the through hole 310. For example, it can be pulled out using a special jig. In this case, it is also possible to adopt a configuration in which the sealing device main body 100X is provided with a concave portion or a convex portion for hooking a dedicated jig.

<Excellent points of the sealing device according to this embodiment>
According to the sealing device 10X according to the present embodiment, when the reinforcing member 200X is fitted into the small cylindrical portion 111 of the cylindrical portion 110X of the sealing device main body 100X, the large cylindrical portion 112 of the cylindrical portion 110X Pressed towards the side. Therefore, the sealing device 10X can be firmly fixed to the through hole 310. Thereby, even in a usage environment where the internal pressure of the housing 300 is high, it is possible to suppress the sealing device 10X from falling out from the through hole 310.

In addition, in this embodiment, by placing the reinforcing member 200X in a non-fitting state (in the case of this embodiment, the reinforcing member 200X is housed in the large cylindrical portion 112), the reinforcing member 200X presses the cylindrical portion 110X. is canceled. Thereby, the fixing force of the large cylindrical portion 112 to the through hole 310 in the cylindrical portion 110X can be reduced. Therefore, the sealing device main body 100X can be easily pulled out from the through hole 310. Therefore, the workability of removing the sealing device 10X from the through hole 310 can be improved.

In addition, in this embodiment, by pushing the reinforcing member 200X fitted into the small cylindrical part 111 and housing it in the large cylindrical part 112, the pressure on the cylindrical part 110X by the reinforcing member 200X can be released. . Furthermore, in this embodiment, since the pressing force on the through hole 310 of the sealing device main body 100X can be suppressed to a low level, the inner circumferential surface of the through hole 310 and the outer circumferential surface of the sealing device main body 100X can be prevented from being damaged. Can be suppressed.

In each of the above embodiments, the inner circumferential surface of the through hole is formed of a cylindrical surface. Therefore, the cylindrical portion of the sealing device main body is constituted by a cylindrical portion. However, if the shape of the inner circumferential surface of the through hole is different, the shape of the cylindrical portion of the sealing device main body may be configured to match the shape of the inner circumferential surface of the through hole. In this case, the shape of the reinforcing member for pressing the cylindrical portion of the sealing device main body toward the outer peripheral surface may also be configured to match the shape of the cylindrical portion of the sealing device main body.

10, 10X: Sealing device 100, 100X: Sealing device main body 110, 110X: Cylindrical portion 111: Small tube portion 112: Large tube portion 120: Bottom portion 200, 200X: Reinforcing member 201: Tapered surface 210: Fitting portion 211: Taper Surface 220: Inward flange portion 300: Housing 310: Through hole 311: Tapered surface 400: Tool 500: Hammer

Claims (10)

A sealing device for closing a through hole,
a bottomed cylindrical sealing device main body that is press-fitted into the through hole and configured such that the outer peripheral surface of the cylindrical portion is in close contact with the inner peripheral surface of the through hole;
a fitted state in which the cylindrical part is inserted through the opening of the cylindrical part and is fitted onto the inner circumferential surface of the cylindrical part and presses the cylindrical part toward the outer circumferential surface; and a position in the fitted state. a reinforcing member configured to be able to assume an unfitted state in which the reinforcing member deviates from the cylindrical portion and releases pressure on the cylindrical portion;
A sealing device comprising: 2. The sealing device according to claim 1, wherein the reinforcing member includes a cylindrical fitting portion that is fitted into an inner circumferential surface of the cylindrical portion. The sealing device according to claim 2, wherein the reinforcing member includes a protrusion that protrudes radially inward from the fitting portion. 4. The sealing device according to claim 3, wherein the protrusion is an inward flange. The cylindrical part is
a small cylinder part arranged on the opening side and into which the reinforcing member is fitted;
a large cylindrical portion disposed on the bottom side of the opening and having an inner diameter larger than the inner diameter of the small cylindrical portion;
The sealing device according to claim 1, characterized in that it has: 6. The sealing device according to claim 5, wherein the reinforcing member is a disc-shaped member. Pressing into the through hole a bottomed cylindrical sealing device body configured such that the outer peripheral surface of the cylindrical portion is in close contact with the inner peripheral surface of the through hole;
It is configured to have a fitted state in which the cylindrical portion is pressed toward the outer circumferential surface, and a non-fitted state in which the cylindrical portion is released from the position of the fitted state. a step of fitting a reinforcing member to an inner circumferential surface of the cylindrical portion by inserting it through an opening of the cylindrical portion;
A method for installing a sealing device, comprising: A method for removing a sealing device attached to the through hole by the sealing device attaching method according to claim 7,
The reinforcing member has a cylindrical fitting part that fits into the inner peripheral surface of the cylindrical part,
hooking a tool on a part of the reinforcing member to remove the reinforcing member from the cylindrical part;
pulling out the sealing device main body from the through hole;
A method for removing a sealing device, comprising: The reinforcing member includes a protruding part that protrudes radially inward from the fitting part, and the tool is hooked onto the protruding part or an end of the fitting part to insert the reinforcing member into the cylindrical shape. 9. The method for removing a sealing device according to claim 8, wherein the method includes removing the sealing device from a portion of the sealing device. A method for removing a sealing device attached to the through hole by the sealing device attaching method according to claim 7,
The cylindrical portion includes a small cylindrical portion that is disposed on the opening side and into which the reinforcing member is fitted, and a small cylindrical portion that is disposed on the bottom side of the opening and whose inner diameter is smaller than the inner diameter of the small cylindrical portion. has a large large cylinder part,
a step of pushing the reinforcing member fitted into the small cylindrical portion and housing it in the large cylindrical portion;
pulling out the sealing device main body from the through hole;
A method for removing a sealing device, comprising:

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