JP2023012340A - sealing device - Google Patents

Abstract

To reduce manufacturing costs and secure stable sealability.SOLUTION: A sealing device 10 includes: an annular reinforcement ring 20 along an inner peripheral surface 111 of a hole of a housing 110; a cylindrical seal member 30 which is fixed to the reinforcement ring and formed of an elastic material; and an annular fixing member 40 along an outer peripheral surface of the seal member. The seal member includes: a first fixing part 31 which elastically deforms between the inner peripheral surface of the hole and the reinforcement ring to be fixed to the housing while tightly adhering to the inner peripheral surface of the hole; a second fixing part 32 which is fastened from the outer periphery side by the fixing member to be fixed to a shaft 120 while tightly adhering to an outer peripheral surface 121 of the shaft inserted into the hole of the housing; and a film part 33 provided between the first fixing part and the second fixing part.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to sealing devices.

Conventionally, there is known a sealing device for sealing an annular gap between a housing having a hole and a shaft inserted into the hole. For example, Patent Literature 1 describes a joint seal in which a rubber-like elastic body is vulcanized and adhered to the outer peripheral surface of a tubular metal fitting that is inserted into an opening of a piping channel. The rubber-like elastic body of this joint seal is provided with a seal lip that is in close contact with the inner peripheral surface of the pipe flow path.

JP 2012-255470 A

In the joint seal described in Patent Document 1, since the seal lip is interposed between the outer peripheral surface of the tubular fitting and the inner peripheral surface of the piping flow path, the seal lip and the piping flow path are separated by the eccentricity of the tubular fitting. The state of close contact with the inner peripheral surface tends to fluctuate. Therefore, in the joint seal described in Patent Document 1, it is necessary to increase the thickness (tightening allowance) of the seal lip so as to ensure the tight contact between the seal lip and the inner peripheral surface of the piping flow path.

Here, since the seal lip has an undercut shape, if the thickness of the seal lip increases, it is difficult to forcibly punch and mold the rubber-like elastic body. Therefore, it is necessary to provide a parting line extending across the seal lip, and as a result, a process for removing burrs and the like caused by the parting line is required.

In view of the above circumstances, an object of the present disclosure is to provide a sealing device capable of ensuring stable sealing performance while reducing manufacturing costs.

In order to solve the above problems, a sealing device according to one aspect of the present disclosure is a sealing device that seals an annular space formed between a housing having a hole and a shaft that is inserted into the hole. an annular reinforcing ring along the inner peripheral surface of the hole; a cylindrical sealing member fixed to the reinforcing ring and made of an elastic material; and an annular fixing member along the outer peripheral surface of the sealing member. a first fixing portion in which the sealing member is fixed to the housing while being in close contact with the inner peripheral surface of the hole by elastically deforming between the inner peripheral surface of the hole and the reinforcing ring; a second fixing portion that is fixed to the shaft while being in close contact with the outer peripheral surface of the shaft by being tightened from the outer peripheral side by the fixing member; and a second fixing portion provided between the first fixing portion and the second fixing portion. and a membrane portion.

INDUSTRIAL APPLICABILITY According to the present disclosure, it is possible to provide a sealing device having stable sealing properties while reducing manufacturing costs.

It is a sectional view of a sealing device concerning a 1st embodiment. It is a figure for demonstrating the eccentricity of a shaft. It is a sectional view of a sealing device concerning a 2nd embodiment. It is a sectional view of a sealing device concerning a 3rd embodiment. FIG. 5 is a cross-sectional view of a sealing device according to Modification 1;

Preferred embodiments of the present disclosure will be described below with reference to the accompanying drawings. Note that the dimensions and scale of each part in the drawings are appropriately different from the actual ones, and some parts are schematically shown for easy understanding. Moreover, the scope of the present disclosure is not limited to these forms unless there is a description to the effect that the present disclosure is particularly limited in the following description.

1-1. Sealing Device FIG. 1 is a cross-sectional view of a sealing device 10 according to a first embodiment. The sealing device 10 seals an annular gap formed between a housing 110 having a hole H and a shaft 120 inserted into the hole H. The housing 110 and the shaft 120 are used, for example, in connection structures or joints provided in machines such as automobiles, industrial machines or construction machines, or auxiliary machines thereof.

Housing 110 is a structure having a hole H therein. Housing 110 is made of, for example, a metal material such as iron, stainless steel, or aluminum alloy. The hole H is a space surrounded by an inner peripheral surface 111 along the axis AX1. In addition, the material forming the housing 110 is not limited to a metal material, and may be, for example, a resin material. Examples of the resin material include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), and polytetrafluoroethylene (PTFE). The resin material may optionally contain fiber base materials such as glass fiber, organic fiber, metal fiber, carbon fiber or mineral fiber, metal oxide such as alumina, aluminum hydroxide, etc. Particulate fillers composed of metal hydroxides such as boron nitride or nitrides such as boron nitride may also be included.

In the example shown in FIG. 1, the housing 110 has a space S1 communicating with the hole H. In the example shown in FIG. The space S1 is a space surrounded by an inner peripheral surface 113 along the axis AX1. Here, the diameter of the inner peripheral surface 113 is smaller than the inner diameter Dh of the hole H. Therefore, a stepped surface 112 is provided between the inner peripheral surface 111 and the inner peripheral surface 113 . The space S1 accommodates gaseous or liquid fluid. Examples of the fluid include gas such as air, and liquid such as water or oil.

In addition, the shape of the housing 110 is not limited to the example shown in FIG. For example, the diameter of the inner peripheral surface 113 may be greater than or equal to the inner diameter Dh of the hole H. Moreover, the shape of the inner peripheral surface 113 is not limited to a shape along a circle centered on the axis AX1, and is arbitrary. Furthermore, the space S1 may be provided as required, and may be omitted.

The shaft 120 is a rod-shaped member having an outer peripheral surface 121 along the axis AX2. Shaft 120 is made of, for example, a metal material such as iron, stainless steel, or aluminum alloy. The outer peripheral surface 121 has a smaller diameter than the inner peripheral surface 111 of the hole H of the housing 110 described above. Therefore, an annular space is formed between the outer peripheral surface 121 and the inner peripheral surface 111 . In addition, the material constituting the shaft 120 is not limited to a metal material, and may be, for example, a resin material. Examples of the resin material include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), and polytetrafluoroethylene (PTFE). The resin material may optionally contain fiber base materials such as glass fiber, organic fiber, metal fiber, carbon fiber or mineral fiber, metal oxide such as alumina, aluminum hydroxide, etc. Particulate fillers composed of metal hydroxides such as boron nitride or nitrides such as boron nitride may also be included.

In the example shown in FIG. 1, the shaft 120 has a constant outer diameter Ds1 along the axis AX2. Further, the shaft 120 is a tubular body (hollow shaft) having a space S2. The space S2 is a space surrounded by an inner peripheral surface 122 along the axis AX2. The space S2 communicates with the space S1 and constitutes, for example, a channel for the aforementioned fluid. The shape of the shaft 120 is not limited to the example shown in FIG. 1, and may have, for example, a plurality of portions with different outer diameters. Also, the shaft 120 may be a solid shaft.

FIG. 1 shows the case where the axis AX1 and the axis AX2 coincide with each other. Note that the axis AX1 and the axis AX2 may not coincide with each other, and one of the axis AX1 and the axis AX2 may be inclined with respect to the other. Axis AX1 and axis AX2 may change as the posture of shaft 120 with respect to housing 110 changes.

Hereinafter, the direction along the axis AX1 will be referred to as the "axial direction", the direction perpendicular to the axis AX1 will be referred to as the "radial direction", and the direction around the axis AX1 will be referred to as the "circumferential direction". Further, the direction from the shaft 120 toward the housing 110 along the axis AX1 is called "X1 direction", and the direction opposite to the X1 direction is called "X2 direction". Schematically, since the axis AX1 and the axis AX2 coincide with each other, the direction along the axis AX2 may be referred to as the "axial direction", and the direction perpendicular to the axis AX2 may be referred to as the "radial direction". , the direction around the axis AX2 may be defined as the "circumferential direction".

The sealing device 10 is a structure that seals an annular gap formed between the inner peripheral surface 111 of the hole H of the housing 110 and the outer peripheral surface 121 of the shaft 120 . As shown in FIG. 1 , the sealing device 10 has a reinforcing ring 20 , a sealing member 30 and a fixing member 40 .

The reinforcement ring 20 is an annular member that reinforces the seal member 30 along the axis AX1. The reinforcing ring 20 is arranged along the inner peripheral surface 111 of the hole H of the housing 110 . The reinforcing ring 20 is made of a material having a Young's modulus higher than that of the material of the sealing member 30, from the viewpoint of ensuring necessary rigidity and the like. Specifically, the reinforcing ring 20 is made of, for example, a resin material or a metal material.

Examples of the resin material forming the reinforcing ring 20 include polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), and the like. The resin material may optionally contain fiber base materials such as glass fiber, organic fiber, metal fiber, carbon fiber or mineral fiber, metal oxide such as alumina, aluminum hydroxide, etc. Particulate fillers composed of metal hydroxides such as boron nitride or nitrides such as boron nitride may also be included. When the reinforcing ring 20 is made of a resin material, the reinforcing ring 20 is manufactured by injection molding, for example.

Examples of the metal material forming the reinforcing ring 20 include stainless steel and SPCC (cold rolled steel). When the reinforcing ring 20 is made of a metal material, the reinforcing ring 20 is manufactured by, for example, pressing or forging.

The reinforcing ring 20 has an L shape when viewed in a cross section taken along a plane including the axis AX1. That is, the reinforcing ring 20 has a first portion 21 and a second portion 22 . The first portion 21 has a tubular shape along the inner peripheral surface 111 of the hole H of the housing 110 . The second portion 22 has a plate shape protruding radially inward from one end of the first portion 21 in the axial direction. In the example shown in FIG. 1, the second portion 22 is connected to the end of the first portion 21 in the X1 direction and extends in a direction perpendicular to the axis AX1. In addition, the cross-sectional shape of the reinforcing ring 20 is not limited to the example shown in FIG.

Here, the outer diameter of the first portion 21 is smaller than the inner diameter Dh of the hole H. The inner diameter of the first portion 21 is larger than the outer diameter Ds1 of the shaft 120 . Further, the inner diameter of reinforcing ring 20 is larger than inner diameter Ds2 of shaft 120 and smaller than outer diameter Ds1 of shaft 120 . The inner diameter of the reinforcing ring 20 may be equal to or greater than the outer diameter Ds1 of the shaft 120, or may be equal to or less than the inner diameter Ds2 of the shaft 120.

The sealing member 30 is a tubular elastic member that is fixed to the reinforcing ring 20 and adheres tightly to the inner peripheral surface 111 of the hole H of the housing 110 and the outer peripheral surface 121 of the shaft 120 . Here, the seal member 30 is fixed to the inner peripheral surface 111 together with the reinforcing ring 20 by press fitting. A shaft 120 is inserted inside the seal member 30 .

The seal member 30 is made of an elastic material. Examples of the elastic material include rubber materials such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluororubber (FKM). The sealing member 30 is formed, for example, by insert molding using the reinforcing ring 20 as an insert product. Through the insert molding, the sealing member 30 in a state of being joined to the reinforcing ring 20 by vulcanization adhesion is obtained. A part or the whole of the sealing member 30 may be made of a resin material such as a fluorine-based resin such as PTFE (Poly Tetra Fluoro Ethylene). Rubber materials also include materials called elastomers.

The rubber material forming the seal member 30 preferably has a rubber hardness of 90° or less.

The sealing member 30 has a first fixing portion 31 , a second fixing portion 32 and a film portion 33 . These are arranged side by side in the X1 direction in the order of the second fixing portion 32, the film portion 33, and the first fixing portion 31. As shown in FIG. Moreover, these are integrally formed of the above-described elastic material, and adhere closely to the outer peripheral surface 121 of the shaft 120 . One or both of the first fixing portion 31 and the second fixing portion 32 do not have to be in close contact with the outer peripheral surface 121 .

The first fixing portion 31 is an annular or cylindrical portion of the sealing member 30 that is fixed to the inner peripheral surface 111 of the hole H of the housing 110 . The first fixing portion 31 is joined to the reinforcing ring 20 by vulcanization adhesion or the like. In the example shown in FIG. 1, the first fixing portion 31 includes the reinforcing ring 20. As shown in FIG. That is, the reinforcing ring 20 is embedded in the first fixing portion 31 .

The first fixing portion 31 is inserted into the hole H of the housing 110 with a predetermined interference. Therefore, the outer diameter of the first fixing portion 31 is slightly larger than the inner diameter Dh of the hole H of the housing 110 when the first fixing portion 31 is not inserted into the hole H (natural state). The first fixing portion 31 is elastically deformed between the inner peripheral surface 111 of the hole H and the reinforcing ring 20 by being inserted into the hole H. As shown in FIG. As a result, the first fixing portion 31 is fixed to the housing 110 in close contact with the inner peripheral surface 111 of the hole H. As shown in FIG.

In the example shown in FIG. 1, the outer peripheral surface of the first fixing portion 31 is provided with a curved surface 31a over the entire circumference. The curved surface 31a has a convex curved shape when viewed in a cross section cut along a plane including the axis AX1 or the axis AX2. Therefore, even if the attitude of the first fixing portion 31 changes such that one of the axis AX1 and the axis AX2 is inclined with respect to the other, if the change is within a predetermined range, the first fixing portion 31 and the inner circumference Stable adhesion with the surface 111 is ensured.

Further, the first fixing portion 31 has a portion 31 b protruding inward from the outer peripheral surface 121 of the shaft 120 . Therefore, the inner diameter D1 of the first fixing portion 31 is smaller than the outer diameter Ds1 of the shaft 120 . The portion 31b overlaps the shaft 120 when viewed from the axial direction. Therefore, for example, when the first fixing portion 31 is inserted into the hole H by pushing the shaft 120 in the X1 direction with the seal member 30 attached to the shaft 120, the end 123 of the shaft 120 in the X1 direction is reinforced. Positioning in the X1 direction relative to the ring 20 is prevented. Also, the surface of the portion 31b facing the X2 direction is in contact with or close to the end 123 of the shaft 120 .

The thickness t1 of the first fixing portion 31 is determined according to the difference between the inner diameter Dh of the hole H of the housing 110 and the outer diameter Ds1 of the shaft 120, taking into account the aforementioned interference.

The second fixing portion 32 is an annular or tubular portion of the seal member 30 that is fixed to the outer peripheral surface 121 of the shaft 120 . The second fixing portion 32 is tightened from the outer peripheral side by the fixing member 40 . As a result, the second fixing portion 32 is fixed to the shaft 120 in close contact with the outer peripheral surface 121 of the shaft 120 .

The thickness t2 of the second fixing portion 32 is thinner than the thickness t1 of the first fixing portion 31 . Therefore, the shaft 120 can be easily inserted inside the second fixing portion 32 compared to a configuration in which the thickness t2 of the second fixing portion 32 is equal to or greater than the thickness t1 of the first fixing portion 31 . Here, from the viewpoint of obtaining good adhesion between the second fixing portion 32 and the outer peripheral surface 121 of the shaft 120, the inner diameter of the second fixing portion 32 should be adjusted so that the shaft 120 is not inserted into the second fixing portion 32 (natural state). ) and is preferably slightly smaller than the outer diameter Ds1 of the shaft 120 . It should be noted that the thickness t2 of the second fixing portion 32 is the thickness of a portion of the second fixing portion 32 where the projections 32a, which will be described later, are not provided.

In the example shown in FIG. 1, the end of the second fixing portion 32 in the X2 direction is provided with a projection 32a projecting outward in the radial direction. Therefore, it is possible to increase the durability of the second fixing portion 32 and prevent the fixing member 40 from coming off from the sealing member 30 . In addition, the projection 32a may be provided as necessary, and may be omitted.

The film portion 33 is an annular or tubular portion of the sealing member 30 that connects the first fixing portion 31 and the second fixing portion 32 . The film portion 33 is provided between the first fixing portion 31 and the second fixing portion 32, and is located between the end of the first fixing portion 31 in the X2 direction and the end of the second fixing portion 32 in the X1 direction. connected to each other.

The thickness t3 of the film portion 33 is thinner than the thickness t1 of the first fixing portion 31 . For this reason, compared to the configuration in which the thickness t3 of the film portion 33 is equal to or greater than the thickness t1 of the first fixing portion 31, the film portion 33 has priority over the first fixing portion 31 as the posture of the shaft 120 with respect to the housing 110 changes. It is possible to deform the film portion 33 to In the example shown in FIG. 1 , the thickness t3 of the film portion 33 is equal to the thickness t2 of the second fixing portion 32 . Note that the thickness t3 of the film portion 33 may be different from the thickness t2 of the second fixing portion 32 .

Although the length L of the film portion 33 in the axial direction is not particularly limited, it is preferably equal to or greater than the thickness t2 from the viewpoint of suitably deforming the film portion 33 .

The fixing member 40 is an annular member for fixing the seal member 30 to the shaft 120 . The fixing member 40 is, for example, a tightening member such as a resin or metal hose clip or band. The fixing member 40 is arranged along the outer peripheral surface of the sealing member 30 . Here, the second fixing portion 32 is interposed between the fixing member 40 and the outer peripheral surface 121 of the shaft 120 . In this state, the fixing member 40 is tightened so that the second fixing portion 32 is brought into close contact with the outer peripheral surface 121 .

FIG. 2 is a diagram for explaining the eccentricity of shaft 120. As shown in FIG. FIG. 2 shows the case where the axis AX2 is inclined at an angle θ with respect to the axis AX1. In this case, the film portion 33 is deformed. Therefore, compared with a configuration without the film portion 33, deformation and posture change of the first fixing portion 31 are reduced. Therefore, stable adhesion between the first fixing portion 31 and the inner peripheral surface 111 of the hole H is ensured even if the posture of the shaft 120 with respect to the housing 110 changes.

As described above, the sealing device 10 seals the annular space formed between the housing 110 having the hole H and the shaft 120 inserted into the hole H. As shown in FIG. Here, as described above, the sealing device 10 includes the annular reinforcing ring 20 along the inner peripheral surface 111 of the hole H, the cylindrical sealing member 30 fixed to the reinforcing ring 20, and the outer peripheral surface of the sealing member 30. and an annular fixing member 40 along the . The seal member 30 is made of an elastic material, and has the first fixing portion 31, the second fixing portion 32, and the film portion 33, as described above. The first fixing portion 31 is fixed to the housing 110 in close contact with the inner peripheral surface 111 of the hole H by elastically deforming between the inner peripheral surface 111 of the hole H and the reinforcing ring 20 . The second fixing portion 32 is fixed to the shaft 120 in close contact with the outer peripheral surface 121 of the shaft 120 by being tightened from the outer peripheral side by the fixing member 40 . The film portion 33 is provided between the first fixing portion 31 and the second fixing portion 32 .

In the sealing device 10 described above, the first fixing portion 31 is in close contact with the inner peripheral surface 111 of the hole H, and the second fixing portion 32 is in close contact with the outer peripheral surface 121 of the shaft 120 . The annular space that is formed can be sealed.

Moreover, since the film portion 33 is provided between the first fixing portion 31 and the second fixing portion 32 , even if the shaft 120 is eccentric with respect to the housing 110 , the film portion 33 is preferentially fixed over the first fixing portion 31 . can reduce the change in posture of the first fixing portion 31 . Therefore, the tightening margin of the first fixing portion 31 can be made smaller than before. As a result, even if an undercut-shaped protrusion or the like is provided on the outer peripheral surface of the first fixing portion 31, the seal member 30 is molded without providing a parting line that crosses the outer peripheral surface of the first fixing portion 31. be able to. As a result, stable adhesion between the first fixing portion 31 and the housing 110 can be ensured without performing a step of removing burrs and the like caused by the parting line.

In addition, since the interference of the first fixing portion 31 can be small, the insertion load of the first fixing portion 31 into the hole H of the housing 110 can be reduced, and the degree of freedom in designing the first fixing portion 31 can be increased. can be done. For example, the width (fitting width) of the first fixing portion 31 in close contact with the housing 110 can be increased.

Furthermore, since the second fixing portion 32 is fixed to the shaft 120 by tightening the fixing member 40 , the second fixing portion 32 can be fixed to the shaft 120 regardless of the shape, surface roughness, dimensional accuracy, etc. of the outer peripheral surface 121 of the shaft 120 . can be stably brought into close contact with the outer peripheral surface 121 of the . Also, the first fixing part 31 can be inserted into the hole H of the housing 110 after fixing the second fixing part 32 to the shaft 120 . Therefore, the sealing device 10 can be easily assembled with the housing 110 and the shaft 120 .

As can be understood from the above, the sealing device 10 can ensure stable sealing performance while reducing manufacturing costs.

In this embodiment, as mentioned above, shaft 120 is a tubular body. Therefore, the space S2 inside the shaft 120 can be communicated with the space S1 inside the housing 110 . As a result, these spaces can form flow channels.

Further, as described above, the reinforcing ring 20 has the tubular first portion 21 and the plate-like second portion 22 protruding inward from one axial end of the first portion 21 . Therefore, it is possible to efficiently increase the rigidity of the reinforcing ring 20 in the radial direction while ensuring the necessary width of the reinforcing ring 20 in the axial direction. As a result, stable adhesion between the first fixing portion 31 and the inner peripheral surface 111 of the hole H of the housing 110 can be obtained.

Furthermore, as described above, when the elastic material forming the seal member 30 is a rubber material, the first fixing portion 31, the second fixing portion 32, and the film portion 33 are integrally formed of the rubber material. . Therefore, the adhesion of the first fixing portion 31 to the housing 110 and the adhesion of the second fixing portion 32 to the shaft 120 can be enhanced. Further, the film portion 33 can be easily deformed as the shaft 120 is eccentric with respect to the housing 110 . Moreover, since the film portion 33 is integrally formed with the first fixing portion 31 and the second fixing portion 32, damage to the seal member 30 due to deformation of the film portion 33 can be reduced.

Here, if the rubber material constituting the seal member 30 has a rubber hardness of 90° or less, the film portion 33 can be easily deformed following the eccentricity of the shaft 120 with respect to the housing 110 .

Moreover, as described above, when the reinforcing ring 20 is made of a metal material or a resin material, there is an advantage that the rigidity of the reinforcing ring 20 in the radial direction can be easily increased.

Furthermore, as described above, the thickness of the film portion 33 is thinner than the thickness of the first fixing portion 31 . Therefore, the film portion 33 can be easily deformed as the shaft 120 is eccentric with respect to the housing 110 . In addition, deformation of the first fixing portion 31 due to deformation of the film portion 33 can be reduced compared to a configuration in which the thickness of the film portion 33 is equal to or greater than the thickness of the first fixing portion 31 . Therefore, even if the film portion 33 is deformed, the first fixing portion 31 can be stably brought into close contact with the inner peripheral surface 111 of the hole H of the housing 110 .

2. Second Embodiment A second embodiment of the present disclosure will be described below. In the embodiments exemplified below, the reference numerals used in the description of the above-described embodiments are used for the elements whose actions and functions are the same as those of the above-described embodiments, and detailed descriptions thereof are appropriately omitted.

FIG. 3 is a cross-sectional view of a sealing device 10A according to the second embodiment. The sealing device 10A is configured in the same manner as the sealing device 10 of the above-described first embodiment, except that the sealing member 30A is replaced with the sealing member 30A. The seal member 30A is configured in the same manner as the seal member 30 except that it has a first fixing portion 31A instead of the first fixing portion 31. As shown in FIG. The first fixing portion 31A is configured in the same manner as the first fixing portion 31 except that it has an inclined surface 31c instead of the curved surface 31a. In addition, in FIG. 3, the shape of the first fixing portion 31A in the natural state is indicated by a chain double-dashed line.

The inclined surface 31c is provided on the outer peripheral surface of the first fixing portion 31A, and is inclined so as to approach the axis AX1 or the axis AX2 toward the end of the first fixing portion 31A in the X1 direction. In addition, on the outer peripheral surface of the first fixing portion 31A shown in FIG. 3, the position of the X2 direction is closer to the axis line AX1 or the axis line AX2 toward the end of the first fixing portion 31A in the X2 direction than the inclined surface 31c. A slanted surface is provided that is slanted in such a way as to A surface parallel to the axis AX1 or the axis AX2 may be provided instead of the inclined surface.

According to the sealing device 10A described above, as with the sealing device 10 of the first embodiment described above, it is possible to reduce manufacturing costs and ensure stable sealing performance. In addition, in the present embodiment, as described above, the outer peripheral surface of the first fixing portion 31A has the inclined surface 31c that is inclined so that the thickness t1 becomes thinner in the direction away from the second fixing portion 32 . Therefore, the first fixing portion 31A can be easily inserted into the hole H of the housing 110 even when the shaft 120 is eccentric with respect to the housing 110 .

3. Third Embodiment A third embodiment of the present disclosure will be described below. In the embodiments exemplified below, the reference numerals used in the description of the above-described embodiments are used for the elements whose actions and functions are the same as those of the above-described embodiments, and detailed descriptions thereof are appropriately omitted.

FIG. 4 is a cross-sectional view of a sealing device 10B according to the third embodiment. The sealing device 10B is configured in the same manner as the sealing device 10 of the above-described first embodiment, except that the sealing member 30B is replaced with the sealing member 30B. The seal member 30B is configured in the same manner as the seal member 30 except that it has a first fixing portion 31B instead of the first fixing portion 31. As shown in FIG. The first fixing portion 31B is configured in the same manner as the first fixing portion 31A of the second embodiment except that a lip portion 31d is added.

The lip portion 31d is a projection provided over the entire circumference of the outer peripheral surface of the first fixing portion 31B. In the example shown in FIG. 4, the lip portion 31d protrudes radially outward in a direction inclined with respect to the radial direction. The tip (outer peripheral edge) of the lip portion 31d contacts the inner peripheral surface 111 of the hole H over the entire circumference. The shape, position, size, etc. of the lip portion 31d are not limited to the example shown in FIG. 4, and are arbitrary. For example, the shape of the lip portion 31d may be a shape extending parallel to the radial direction or a shape extending parallel to the axial direction. Also, the lip portion 31 d may come into contact with the step surface 112 . Also, the inclined surface 31c may be omitted.

With the sealing device 10B described above, as with the sealing device 10 of the above-described first embodiment, it is possible to reduce manufacturing costs and ensure stable sealing performance. Further, in the present embodiment, as described above, the first fixing portion 31B has the lip portion 31d that contacts the inner peripheral surface 111 of the hole H over the entire circumference. Therefore, even if the machining accuracy of the hole H of the housing 110 is poor, the first fixing portion 31B can be stably brought into close contact with the inner peripheral surface 111 of the hole H of the housing 110 .

4. MODIFICATIONS Each form illustrated above can be variously modified. Specific modifications that can be applied to each of the above-described modes are exemplified below. Two or more aspects arbitrarily selected from the following examples can be combined as appropriate within a mutually consistent range.

4-1. Modification 1
FIG. 5 is a cross-sectional view of sealing devices 10_1 and 10_2 according to Modification 1. As shown in FIG. Sealing devices 10_1 and 10_2 are attached to both ends of shaft 120 . The sealing device 10_1 then seals the annular space between the housing 110_1 and the shaft 120 . Sealing device 10_2 seals the annular space between housing 110_2 and shaft 120 . Here, each of the sealing devices 10_1 and 10_2 is configured similarly to the sealing device 10 of the first embodiment described above. Moreover, each of the housings 110_1 and 110_2 is configured similarly to the housing 110 of the above-described first embodiment.

Note that the housings 110_1 and 110_2 may have different configurations. Also, the sealing devices 10_1 and 10_2 may have different configurations. Each of the sealing devices 10_1 and 10_2 may be configured similarly to the sealing device 10A of the second embodiment, or may be configured similarly to the sealing device 10B of the third embodiment.

4-2. Modification 2
The shape of the first fixing portion of the seal member is not limited to the above-described forms. For example, the thickness of the first fixing portion may be constant along the axial direction.

DESCRIPTION OF SYMBOLS 10... Sealing device 10A... Sealing device 10B... Sealing device 10_1... Sealing device 10_2... Sealing device 20... Reinforcement ring 21... First part 22... Second part 30... Sealing member 30A... Seal Members 30B Sealing member 31 First fixing part 31A First fixing part 31B First fixing part 31a Curved surface 31b Portion 31c Inclined surface 31d Lip portion 32 Third 2 fixing part 32a...protrusion 33...membrane part 40...fixing member 110...housing 110_1...housing 110_2...housing 111...inner peripheral surface 112...stepped surface 113...inner peripheral surface 120...shaft , 121... outer peripheral surface, 122... inner peripheral surface, 123... end, A... type, AX1... axis line, AX2... axis line, D1... inner diameter, Dh... inner diameter, Ds1... outer diameter, Ds2... inner diameter, H... hole, S1 ... space, S2 ... space, t1 ... thickness, t2 ... thickness, t3 ... thickness, θ ... angle.

Claims (9)

A sealing device for sealing an annular space formed between a housing having a hole and a shaft inserted into the hole,
an annular reinforcing ring along the inner peripheral surface of the hole;
a cylindrical sealing member fixed to the reinforcing ring and made of an elastic material;
and an annular fixing member along the outer peripheral surface of the sealing member,
The sealing member is
a first fixing portion that is elastically deformed between the inner peripheral surface of the hole and the reinforcing ring to be fixed to the housing while being in close contact with the inner peripheral surface of the hole;
a second fixing portion fixed to the shaft in close contact with the outer peripheral surface of the shaft by being tightened from the outer peripheral side by the fixing member;
a film portion provided between the first fixing portion and the second fixing portion;
sealing device. wherein the shaft is a tubular body,
A sealing device according to claim 1 . The reinforcing ring has a tubular first portion and a plate-like second portion protruding radially inward from one axial end of the first portion.
The sealing device according to claim 1 or 2. the elastic material is a rubber material,
The first fixing portion, the second fixing portion, and the film portion are integrally constructed of the rubber material,
A sealing device according to any one of claims 1 to 3. The rubber hardness of the rubber material is 90° or less.
The sealing device according to claim 4. The outer peripheral surface of the first fixing part has an inclined surface that is inclined so that the thickness becomes thinner in the direction away from the second fixing part,
A sealing device according to any one of claims 1 to 5. The reinforcing ring is made of a metal material or a resin material,
A sealing device according to any one of claims 1 to 6. The first fixing part has a lip part that contacts the inner peripheral surface of the hole over the entire circumference,
A sealing device according to any one of claims 1 to 7. the thickness of the film portion is thinner than the thickness of the first fixing portion;
A sealing device according to any one of claims 1 to 8.

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