Gasket installation structure

Abstract

The present invention provides a sealing gasket installation structure capable of suppressing errors in the installation direction of the sealing gasket. The structure is characterized in that when a clamp (200) is inserted relative to the sealing gasket (100) from the side of the large-diameter inner peripheral surface (124), the small-diameter outer peripheral surface (210) is pressed into the inner peripheral surface of the sealing protrusion (122), so that the sealing gasket (100) is held by the clamp (200); when the clamp (200) is inserted relative to the sealing gasket (100) from the side of the small-diameter inner peripheral surface (123), the small-diameter outer peripheral surface (210) does not reach a position of contact with the sealing protrusion (122).

Description

Technical Field

[0001] The invention relates to a mounting structure of a sealing gasket for sealing an annular gap. Background Art

[0002] Conventionally, a gasket for sealing annular gaps is known. Figure 9 , a gasket in a conventional example is described. Figure 9 This is a schematic cross-sectional view of a sealing structure using a conventional gasket. The illustrated gasket 700 is used to seal the annular gap between the housing 600 and the shaft 500, which is inserted into the insertion hole 610 of the housing 600. The shaft 500 is inserted from the sealing target side (O) toward the opposite side (A). Before the shaft 500 is inserted into the insertion hole 610, the gasket 700 is pre-installed in the insertion hole 610 using a jig (not shown).

[0003] like Figure 9 As shown in (a), the sealing gasket 700 includes a reinforcement ring 710 and an elastomeric sealing body 720 integrally provided with the reinforcement ring 710. Furthermore, the reinforcement ring 710 includes a cylindrical portion 711 and an inwardly facing flange portion 712 provided at the end of the cylindrical portion 711 on the sealing object side (O). Furthermore, the sealing body 720 integrally includes an outer peripheral sealing portion 721 that is fitted and fixed to the inner peripheral surface of the insertion hole 610, and a sealing protrusion 722 that is in close contact with the outer peripheral surface of the shaft 500.

[0004] The gasket 700 thus constructed is mounted on the insertion hole 610 (see FIG. 1 ) so that the inward flange portion 712 of the reinforcement ring 710 faces the sealing target side (O). Figure 9 However, the gasket 700 can also be installed in such a manner that the inward flange portion 712 of the reinforcement ring 710 becomes the opposite side (A) to the sealing object side (O) (see Figure 9 (b)). In this way, if it is installed in the opposite direction, although the sealing performance can be obtained, the inward flange portion 712 of the reinforcement ring 710 may be exposed to the atmosphere and rust.

[0005] As a countermeasure to prevent the incorrect installation direction of the gasket 700, one of the two end faces of the gasket 700 can be painted and then inspected after installation to see if the paint is applied. However, this countermeasure requires the application of paint and its inspection, which leads to increased costs.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2006-207715 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] An object of the present invention is to provide a sealing gasket installation structure capable of preventing the sealing gasket from being installed in an incorrect direction.

[0011] Means used to solve problems

[0012] The present invention adopts the following means to solve the above-mentioned problems.

[0013] The installation structure of the sealing gasket of the present invention comprises: a sealing gasket for sealing an annular gap between a housing and a shaft, wherein the shaft is inserted into an insertion hole provided in the housing from a sealing object side toward an opposite side thereof; and a clamp for pre-installing the sealing gasket in the insertion hole before the shaft is inserted into the insertion hole, characterized in that:

[0014] The sealing gasket comprises:

[0015] reinforcement rings; and

[0016] The sealing main body of the elastic body has an outer peripheral sealing portion fixedly fitted on the inner peripheral surface of the insertion hole and a sealing protrusion in close contact with the outer peripheral surface of the shaft, and is integrally provided on the reinforcement ring.

[0017] The inner peripheral surface of the sealing body portion includes a portion on the sealing object side relative to the sealing protrusion, which is composed of a small-diameter inner peripheral surface portion, and a portion on the opposite side of the sealing protrusion relative to the sealing object side, which is composed of a large-diameter inner peripheral surface portion having an inner diameter larger than that of the small-diameter inner peripheral surface portion.

[0018] The fixture comprises:

[0019] a small-diameter outer peripheral surface portion configured to be pressed into the inner peripheral surface of the sealing protrusion so as to retain the sealing gasket;

[0020] a medium-diameter outer peripheral surface portion having an outer diameter larger than the inner diameter of the small-diameter inner peripheral surface portion and smaller than the inner diameter of the large-diameter inner peripheral surface portion, and larger than the outer diameter of the small-diameter outer peripheral surface portion; and

[0021] The large-diameter outer peripheral surface has an outer diameter greater than the inner diameter of the large-diameter inner peripheral surface and greater than the outer diameter of the medium-diameter outer peripheral surface.

[0022] When the clamp is inserted relative to the gasket from the large-diameter inner peripheral surface side, the step surface between the medium-diameter outer peripheral surface and the large-diameter outer peripheral surface abuts against the end surface of the gasket on the large-diameter inner peripheral surface side, and the small-diameter outer peripheral surface is pressed into the inner peripheral surface of the sealing protrusion, so that the gasket is held by the clamp.

[0023] When the clamp is inserted relative to the sealing gasket from the small-diameter inner circumferential surface side, the step surface between the small-diameter outer circumferential surface and the medium-diameter outer circumferential surface abuts against the end surface of the sealing gasket on the small-diameter inner circumferential surface side, and the small-diameter outer circumferential surface does not reach a position in contact with the sealing protrusion.

[0024] According to the present invention, when the clamp is inserted from the larger-diameter inner circumferential surface side of the gasket, the gasket is held by the clamp. In contrast, when the clamp is inserted from the smaller-diameter inner circumferential surface side of the gasket, the gasket is not held by the clamp. Therefore, in a structure where the gasket is installed in the insertion hole from the smaller-diameter inner circumferential surface side, the installation structure of the present invention can prevent errors in the gasket's installation direction.

[0025] In addition, another gasket installation structure of the present invention includes: a gasket that seals an annular gap between a housing and a shaft, the shaft being inserted into an insertion hole provided in the housing from a sealing object side toward an opposite side thereof; and a fixture for pre-installing the gasket in the insertion hole before the shaft is inserted into the insertion hole, characterized in that

[0026] The sealing gasket comprises:

[0027] reinforcement rings; and

[0028] a sealing main body made of an elastic body, integrally comprising an outer peripheral sealing portion fitted and fixed to the inner peripheral surface of the insertion hole and a sealing protrusion in close contact with the outer peripheral surface of the shaft, and integrally provided on the reinforcement ring;

[0029] The inner peripheral surface of the sealing body portion includes a portion on the sealing object side relative to the sealing protrusion, which is composed of a small-diameter inner peripheral surface portion, and a portion on the opposite side of the sealing protrusion relative to the sealing object side, which is composed of a large-diameter inner peripheral surface portion having an inner diameter larger than that of the small-diameter inner peripheral surface portion.

[0030] The fixture comprises:

[0031] a small-diameter outer peripheral surface portion configured to be pressed into the inner peripheral surface of the small-diameter inner peripheral surface portion so as to retain the gasket;

[0032] a large-diameter outer peripheral surface portion, the outer diameter of which is larger than the inner diameter of the large-diameter inner peripheral surface portion and larger than the outer diameter of the small-diameter outer peripheral surface portion;

[0033] When the clamp is inserted relative to the sealing gasket from the side of the small-diameter inner peripheral surface, the step surface between the small-diameter outer peripheral surface and the large-diameter outer peripheral surface abuts against the end surface of the sealing gasket on the side of the small-diameter inner peripheral surface, and the small-diameter outer peripheral surface is pressed into the inner peripheral surface of the small-diameter inner peripheral surface, so that the sealing gasket is held by the clamp.

[0034] When the clamp is inserted from the large diameter inner circumferential surface side relative to the sealing gasket, the step surface between the small diameter outer circumferential surface and the large diameter inner circumferential surface abuts against the end surface of the sealing gasket on the large diameter inner circumferential surface side, forming a gap between the small diameter outer circumferential surface and the large diameter inner circumferential surface.

[0035] According to the present invention, when the clamp is inserted from the smaller-diameter inner circumferential surface side of the gasket, the gasket is held by the clamp. In contrast, when the clamp is inserted from the larger-diameter inner circumferential surface side of the gasket, the gasket is not held by the clamp. Therefore, in a structure where the gasket is installed in the insertion hole from the larger-diameter inner circumferential surface side, the installation structure of the present invention can prevent errors in the gasket's installation direction.

[0036] Preferably, a plurality of protrusions compressed by the small-diameter outer peripheral surface portion are provided on the small-diameter inner peripheral surface portion at intervals in the circumferential direction.

[0037] Thus, the small-diameter outer peripheral surface of the jig can be pressed into the inner peripheral surface of the small-diameter inner peripheral surface of the gasket without increasing the force required for press-fitting, thereby holding the gasket.

[0038] Effects of the Invention

[0039] As described above, according to the present invention, it is possible to suppress errors in the mounting direction of the gasket. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a plan view of a gasket according to Examples 1 and 2 of the present invention.

[0041] Figure 2 It is a partially cutaway cross-sectional view of a gasket according to Examples 1 and 2 of the present invention.

[0042] Figure 3 This is a schematic cross-sectional view of a sealing structure including a gasket according to Example 1 of the present invention.

[0043] Figure 4 This is a schematic cross-sectional view showing a state in which the gasket according to Example 1 of the present invention is mounted.

[0044] Figure 5 This is a schematic cross-sectional view showing a state in which the jig according to Example 1 of the present invention is inserted into the gasket in a wrong direction.

[0045] Figure 6 This is a schematic cross-sectional view of a sealing structure including a gasket according to a second embodiment of the present invention.

[0046] Figure 7This is a schematic cross-sectional view showing a state in which a gasket according to Example 2 of the present invention is mounted.

[0047] Figure 8 This is a schematic cross-sectional view showing a state in which a jig according to Example 2 of the present invention is inserted into a gasket in a wrong direction.

[0048] Figure 9 1 is a schematic cross-sectional view of a sealing structure having a gasket according to a conventional example. DETAILED DESCRIPTION

[0049] Hereinafter, the embodiments for implementing the present invention will be described in detail with reference to the accompanying drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in these embodiments are not intended to limit the scope of the present invention to these embodiments unless otherwise specified.

[0050] (Example 1)

[0051] Reference Figures 1 to 5 The mounting structure of the gasket according to the first embodiment of the present invention will now be described. The gasket according to this embodiment is suitable for use as a seal for an electric oil pump in an automobile, for example. However, the gasket according to this embodiment can also be used in sealing structures of various parts of automobiles as well as general industrial machinery.

[0052] (Sealing gasket)

[0053] In particular, refer to Figure 1 and Figure 2 , the sealing gasket involved in this embodiment is described. Figure 1 This is a plan view of a gasket according to Example 1 of the present invention. Figure 2 : is a partially cutaway cross-sectional view of a gasket according to Example 1 of the present invention. Figure 2 The cross-sectional view in Figure 1 In the AA section view. In addition, Figure 1 、 2 The portion indicated by the dotted line in FIG. 1 (protrusion 123 a ) is a portion related to the structure of the gasket according to the second embodiment.

[0054] The sealing gasket 100 according to this embodiment includes a reinforcement ring 110 made of metal or the like and a sealing body 120 made of an elastic material (e.g., rubber) integrally provided with the reinforcement ring 110. For example, the sealing body 120 can be formed by insert molding using the reinforcement ring 110 as an embedded component, thereby obtaining the sealing gasket 100.

[0055] The reinforcement ring 110 includes a cylindrical portion 111 and an inward flange portion 112 provided at one end portion of the cylindrical portion 111 (an end portion on the sealed object side in the sealing structure).

[0056] The sealing body 120 integrally includes an outer peripheral sealing portion 121 on the outer peripheral surface and a sealing protrusion 122 on the inner peripheral surface. Furthermore, the inner peripheral surface of the sealing body 120, on one end side (the side to be sealed in the sealing structure) of the sealing protrusion 122, is formed by a small-diameter inner peripheral surface 123, while the other end side (the side opposite to the side to be sealed) of the sealing protrusion 122 is formed by a large-diameter inner peripheral surface 124 having an inner diameter larger than that of the small-diameter inner peripheral surface 123.

[0057] (Sealing structure)

[0058] In particular, refer to Figure 3 , the sealing structure of the sealing gasket involved in this embodiment is described. Figure 3 : is a schematic cross-sectional view of a sealing structure having a sealing gasket according to embodiment 1 of the present invention. The sealing structure according to this embodiment includes a housing 600, a shaft 500 inserted into a through hole 610 provided in the housing 600, and a sealing gasket 100 for sealing an annular gap between the housing 600 and the shaft 500. In this embodiment, the shaft 500 is configured to be inserted from the sealing object side (O) to the opposite side (A). That is, Figure 3 , the shaft 500 is inserted into the insertion hole 610 in the direction of arrow P. Furthermore, before the shaft 500 is inserted into the insertion hole 610, the gasket 100 is pre-installed in the insertion hole 610. Furthermore, a sealed fluid such as oil is sealed on the sealed side (O), while the opposite side (A) is exposed to the atmosphere, for example.

[0059] According to the sealing structure constructed as described above, the outer peripheral sealing portion 121 is fitted and fixed to the inner peripheral surface of the insertion hole 610 , and the sealing protrusion 122 is in close contact with the outer peripheral surface 510 of the shaft 500 , thereby sealing the annular gap between the housing 600 and the shaft 500 through the sealing gasket 100 .

[0060] (Sealing gasket installation structure)

[0061] In particular, refer to Figure 4 and Figure 5 , the installation structure of the sealing gasket involved in this embodiment is described. Figure 4 This is a schematic cross-sectional view showing a state in which the gasket according to Example 1 of the present invention is installed. Figure 5 This is a schematic cross-sectional view showing a state in which the jig according to Example 1 of the present invention is inserted into the gasket in a wrong direction.

[0062] In this embodiment, the seal 100 is installed in the insertion hole 610 of the housing 600 from the side of the small-diameter inner peripheral surface portion 123. That is, in this embodiment, the seal 100 is inserted into the insertion hole 610 using the jig 200 in the direction opposite to the direction in which the shaft 500 is inserted into the insertion hole 610.

[0063] The clamp 200 includes, in order from the front end, a small-diameter outer peripheral surface 210, a medium-diameter outer peripheral surface 220, and a large-diameter outer peripheral surface 230. The small-diameter outer peripheral surface 210 is configured to be pressed into the inner peripheral surface of the sealing protrusion 122 of the sealing gasket 100, thereby retaining the sealing gasket 100. The outer diameter of the medium-diameter outer peripheral surface 220 is configured to be larger than the inner diameter of the small-diameter inner peripheral surface 123 of the sealing gasket 100 and smaller than the inner diameter of the large-diameter inner peripheral surface 124. Furthermore, the outer diameter is larger than the outer diameter of the small-diameter outer peripheral surface 210 of the clamp 200. Furthermore, the outer diameter of the large-diameter outer peripheral surface 230 is configured to be larger than the inner diameter of the large-diameter inner peripheral surface 124 of the sealing gasket 100 and larger than the outer diameter of the medium-diameter outer peripheral surface 220 of the clamp 200.

[0064] exist Figure 4 , the clamp 200 is shown inserted into the gasket 100 from the side of the large-diameter inner circumferential surface 124. In this state, the stepped surface 231 between the medium-diameter outer circumferential surface 220 and the large-diameter outer circumferential surface 230 abuts against the end surface of the gasket 100 on the side of the large-diameter inner circumferential surface 124, and the small-diameter outer circumferential surface 210 is pressed into the inner circumferential surface of the sealing protrusion 122. Thus, the gasket 100 is held by the clamp 200. Thus, by inserting the gasket 100 into the insertion hole 610 of the housing 600 while the gasket 100 is held by the clamp 200, the gasket 100 can be installed in the insertion hole 610.

[0065] exist Figure 5 , the jig 200 is shown inserted into the gasket 100 from the side of the small-diameter inner circumferential surface 123. In this case, the step surface 221 between the small-diameter outer circumferential surface 210 and the medium-diameter outer circumferential surface 220 abuts against the end surface of the gasket 100 on the side of the small-diameter inner circumferential surface 123, and the small-diameter outer circumferential surface 210 does not reach a position where it contacts the sealing protrusion 122. Therefore, the gasket 100 cannot be held on the jig 200.

[0066] (Advantages of the Gasket Mounting Structure of the Present Embodiment)

[0067] According to the installation structure of the sealing gasket 100 involved in this embodiment, when the clamp 200 is inserted from the large-diameter inner circumferential surface 124 side relative to the sealing gasket 100, the sealing gasket 100 is held by the clamp 200. In contrast, when the clamp 200 is inserted from the small-diameter inner circumferential surface 123 side relative to the sealing gasket 100, the sealing gasket 100 is not held by the clamp 200. Therefore, in the case of a structure in which the sealing gasket 100 is installed in the insertion hole 610 from the small-diameter inner circumferential surface 123 side as in this embodiment, it is possible to prevent the sealing gasket 100 from being installed in the wrong direction. Therefore, there is no need to paint the sealing gasket 100 to prevent the sealing gasket 100 from being installed in the wrong direction. In addition, since the sealing gasket 100 is more reliably installed in the correct direction, it is also possible to prevent the reinforcement ring 110 from rusting.

[0068] (Example 2)

[0069] exist Figure 1 、 2 as well as Figures 6 to 8 , which illustrates a second embodiment of the present invention. In the first embodiment described above, the seal was installed in the insertion hole from the smaller inner circumferential surface side. In contrast, this embodiment illustrates a structure in which the seal is installed in the insertion hole from the larger inner circumferential surface side. The remaining basic structure and function are the same as in the first embodiment, so identical components are denoted by the same reference numerals, and their descriptions are omitted as appropriate.

[0070] (Sealing gasket)

[0071] In particular, refer to Figure 1 and Figure 2 The gasket according to this embodiment will now be described. The gasket 100 according to this embodiment has the same basic structure as the gasket 100 described in the first embodiment. However, the only difference between this embodiment and the first embodiment is that a plurality of protrusions 123a, shown as dashed lines, are preferably provided at intervals along the circumferential direction on the small-diameter inner circumferential surface portion 123 provided on the inner circumferential surface of the sealing body 120.

[0072] (Sealing structure)

[0073] In particular, refer to Figure 6 , the sealing structure of the sealing gasket involved in this embodiment is described. Figure 6 : is a schematic cross-sectional view of a sealing structure having a sealing gasket according to embodiment 2 of the present invention. The sealing structure according to this embodiment also includes a housing 600X, a shaft 500 inserted into a through hole 610 provided in the housing 600X, and a sealing gasket 100 for sealing an annular gap between the housing 600X and the shaft 500. In addition, in this embodiment, the shaft 500 is also configured to be inserted from the sealing object side (O) to the opposite side (A). That is, Figure 6 , the shaft 500 is inserted into the insertion hole 610 in the direction of arrow P. In addition, before the shaft 500 is inserted into the insertion hole 610 , the gasket 100 is preliminarily mounted in the insertion hole 610 .

[0074] According to the sealing structure constructed as described above, the outer peripheral sealing portion 121 is fitted and fixed to the inner peripheral surface of the insertion hole 610 , and the sealing protrusion 122 is in close contact with the outer peripheral surface 510 of the shaft 500 , thereby sealing the annular gap between the housing 600X and the shaft 500 via the gasket 100 .

[0075] (Sealing gasket installation structure)

[0076] In particular, refer to Figure 7 and Figure 8 , the installation structure of the sealing gasket involved in this embodiment is described. Figure 7 This is a schematic cross-sectional view showing a state in which a gasket according to Example 2 of the present invention is mounted. Figure 8 This is a schematic cross-sectional view showing a state in which a jig according to Example 2 of the present invention is inserted into a gasket in a wrong direction.

[0077] In this embodiment, the seal 100 is installed in the insertion hole 610 of the housing 600X from the side of the large-diameter inner peripheral surface portion 124. That is, in this embodiment, the seal 100 is inserted into the insertion hole 610 using the jig 300 in the same direction as the direction in which the shaft 500 is inserted into the insertion hole 610.

[0078] The jig 300 includes, in order from the front end, a small-diameter outer peripheral surface 310 and a large-diameter outer peripheral surface 320. The small-diameter outer peripheral surface 310 is configured to be pressed into the inner peripheral surface of the small-diameter inner peripheral surface 123 of the gasket 100, thereby retaining the gasket 100. The outer diameter of the large-diameter outer peripheral surface 320 is configured to be larger than the inner diameter of the large-diameter inner peripheral surface 124 and larger than the outer diameter of the small-diameter outer peripheral surface 310.

[0079] exist Figure 7 , the clamp 300 is shown inserted into the gasket 100 from the side of the small-diameter inner circumferential surface 123. In this state, the stepped surface 321 between the small-diameter outer circumferential surface 310 and the large-diameter outer circumferential surface 320 abuts against the end surface of the gasket 100 on the side of the small-diameter inner circumferential surface 123, and the small-diameter outer circumferential surface 310 is pressed into the inner circumferential surface of the small-diameter inner circumferential surface 123. Thus, the gasket 100 is held by the clamp 300. Thus, by inserting the gasket 100 into the insertion hole 610 of the housing 600X while the gasket 100 is held by the clamp 300, the gasket 100 can be installed in the insertion hole 610.

[0080] exist Figure 8, the jig 300 is shown inserted into the gasket 100 from the side of the large-diameter inner circumferential surface 124. In this case, the step surface 321 between the small-diameter outer circumferential surface 310 and the large-diameter inner circumferential surface 320 abuts against the end surface of the gasket 100 on the side of the large-diameter inner circumferential surface 124, forming a gap S between the small-diameter outer circumferential surface 310 and the large-diameter inner circumferential surface 124. Consequently, the gasket 100 cannot be held by the jig 300.

[0081] (Advantages of the Gasket Mounting Structure of the Present Embodiment)

[0082] According to the installation structure of the sealing gasket 100 involved in this embodiment, when the clamp 300 is inserted from the side of the small-diameter inner circumferential surface 123 relative to the sealing gasket 100, the sealing gasket 100 is held by the clamp 300. In contrast, when the clamp 300 is inserted from the side of the large-diameter inner circumferential surface 124 relative to the sealing gasket 100, the sealing gasket 100 is not held by the clamp 300. Therefore, in the case of a structure in which the sealing gasket 100 is installed in the insertion hole 610 from the side of the large-diameter inner circumferential surface 124 as in this embodiment, it is possible to prevent the sealing gasket 100 from being installed in the wrong direction. Therefore, it is not necessary to paint the sealing gasket 100 to prevent the sealing gasket 100 from being installed in the wrong direction. In addition, since the sealing gasket 100 is more reliably installed in the correct direction, it is also possible to prevent the reinforcement ring 110 from rusting.

[0083] Furthermore, in this embodiment, it is preferred that a plurality of protrusions 123a are provided at intervals along the circumferential direction on the small-diameter inner circumferential surface 123 of the sealing gasket 100, which are compressed by the small-diameter outer circumferential surface 310 of the jig 300. Providing a plurality of such protrusions 123a allows the small-diameter outer circumferential surface 310 of the jig 300 to be pressed into the inner circumferential surface of the small-diameter inner circumferential surface 123 of the sealing gasket 100 without increasing the force required for press-fitting, thereby retaining the sealing gasket 100.

[0084] In the above embodiments, the reinforcement ring 110 is shown as consisting of a cylindrical portion 111 and an inward flange portion 112 provided at one end of the cylindrical portion 111. However, the reinforcement ring of the present invention can also be applied to a case where the reinforcement ring consists of a cylindrical portion and an outward flange portion provided at one end of the cylindrical portion. Furthermore, the reinforcement ring of the present invention can also be applied to a case where the reinforcement ring consists of only a cylindrical portion.

[0085] Explanation of symbols:

[0086] 100 Gasket

[0087] 110 reinforcement ring

[0088] 111 cylindrical part

[0089] 112 inward flange

[0090] 120 Sealing body

[0091] 121 Peripheral sealing part

[0092] 122 sealing protrusion

[0093] 123 Small diameter inner surface

[0094] 123a protrusion

[0095] 124 Large diameter inner surface

[0096] 200 fixture

[0097] 210 small diameter outer surface

[0098] 220 mid-diameter outer surface

[0099] 221 step surface

[0100] 230 large diameter peripheral face

[0101] 231 step surface

[0102] 300 fixture

[0103] 310 small diameter outer surface

[0104] 320 Large Diameter Peripheral Facial

[0105] 321 step surface

[0106] 500 axis

[0107] 510 outer surface

[0108] 600, 600X housing

[0109] 610 through hole

Claims

1. A sealing gasket installation structure, comprising: a sealing gasket for sealing an annular gap between the housing and the shaft, the shaft being inserted into an insertion hole provided in the housing from a sealing object side toward an opposite side thereof; and a jig for pre-installing the sealing gasket in the insertion hole before the shaft is inserted into the insertion hole, characterized in that: The sealing gasket comprises: reinforcement rings; and The sealing main body of the elastic body has an outer peripheral sealing portion fixedly fitted on the inner peripheral surface of the insertion hole and a sealing protrusion in close contact with the outer peripheral surface of the shaft, and is integrally provided on the reinforcement ring. The inner peripheral surface of the sealing body portion includes a portion on the sealing object side relative to the sealing protrusion, which is composed of a small-diameter inner peripheral surface portion, and a portion on the opposite side of the sealing protrusion relative to the sealing object side, which is composed of a large-diameter inner peripheral surface portion having an inner diameter larger than that of the small-diameter inner peripheral surface portion. The fixture comprises: a small-diameter outer peripheral surface portion configured to be pressed into the inner peripheral surface of the sealing protrusion so as to retain the sealing gasket; a medium-diameter outer peripheral surface portion having an outer diameter larger than the inner diameter of the small-diameter inner peripheral surface portion and smaller than the inner diameter of the large-diameter inner peripheral surface portion, and larger than the outer diameter of the small-diameter outer peripheral surface portion; and The large-diameter outer peripheral surface has an outer diameter greater than the inner diameter of the large-diameter inner peripheral surface and greater than the outer diameter of the medium-diameter outer peripheral surface. When the clamp is inserted relative to the gasket from the large-diameter inner peripheral surface side, the step surface between the medium-diameter outer peripheral surface and the large-diameter outer peripheral surface abuts against the end surface of the gasket on the large-diameter inner peripheral surface side, and the small-diameter outer peripheral surface is pressed into the inner peripheral surface of the sealing protrusion, so that the gasket is held by the clamp. When the clamp is inserted relative to the sealing gasket from the small-diameter inner circumferential surface side, the step surface between the small-diameter outer circumferential surface and the medium-diameter outer circumferential surface abuts against the end surface of the sealing gasket on the small-diameter inner circumferential surface side, and the small-diameter outer circumferential surface does not reach a position in contact with the sealing protrusion.

2. A sealing gasket installation structure, comprising: a sealing gasket for sealing an annular gap between the housing and the shaft, the shaft being inserted into an insertion hole provided in the housing from a sealing object side toward an opposite side thereof; and a jig for pre-installing the sealing gasket in the insertion hole before the shaft is inserted into the insertion hole, characterized in that: The sealing gasket comprises: reinforcement rings; and a sealing main body made of an elastic body, integrally comprising an outer peripheral sealing portion fitted and fixed to the inner peripheral surface of the insertion hole and a sealing protrusion in close contact with the outer peripheral surface of the shaft, and integrally provided on the reinforcement ring; The inner peripheral surface of the sealing body portion includes a portion on the sealing object side relative to the sealing protrusion, which is composed of a small-diameter inner peripheral surface portion, and a portion on the opposite side of the sealing protrusion relative to the sealing object side, which is composed of a large-diameter inner peripheral surface portion having an inner diameter larger than that of the small-diameter inner peripheral surface portion. The fixture comprises: a small-diameter outer peripheral surface portion configured to be pressed into the inner peripheral surface of the small-diameter inner peripheral surface portion so as to retain the gasket; a large-diameter outer peripheral surface portion, the outer diameter of which is larger than the inner diameter of the large-diameter inner peripheral surface portion and larger than the outer diameter of the small-diameter outer peripheral surface portion; When the clamp is inserted relative to the sealing gasket from the side of the small-diameter inner peripheral surface, the step surface between the small-diameter outer peripheral surface and the large-diameter outer peripheral surface abuts against the end surface of the sealing gasket on the side of the small-diameter inner peripheral surface, and the small-diameter outer peripheral surface is pressed into the inner peripheral surface of the small-diameter inner peripheral surface, so that the sealing gasket is held by the clamp. When the clamp is inserted from the large diameter inner circumferential surface side relative to the sealing gasket, the step surface between the small diameter outer circumferential surface and the large diameter inner circumferential surface abuts against the end surface of the sealing gasket on the large diameter inner circumferential surface side, forming a gap between the small diameter outer circumferential surface and the large diameter inner circumferential surface.

3. The installation structure of the sealing gasket according to claim 2, characterized in that: A plurality of protrusions compressed by the small-diameter outer peripheral surface portion are provided on the small-diameter inner peripheral surface portion at intervals in the circumferential direction.

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