JP6151151B2 - Gasket with filter - Google Patents

Description

  The present invention relates to a gasket which is a kind of sealing device, and more particularly to a gasket with a filter including a filter made of mesh or the like. The filter-equipped gasket of the present invention is used, for example, in the field of automobiles and auxiliary equipment, or in the field of general industrial machinery.

  Conventionally, a gasket 51 with a filter shown in FIG. 3 is known, and is configured as follows.

  That is, first, a disk-like filter 52 made of a mesh or the like is provided, and a peripheral edge 52a of the filter 52 is held by a gasket main body 53 made of a rubber-like elastic body. As shown in the figure, the gasket main body 53 is formed in a squeeze-like or block-like cross-sectional shape.

  The filter-equipped gasket 51 is mounted on a housing having a fluid flow path. Specifically, the gasket main body 53 is mounted in an annular gasket mounting groove provided around the fluid flow path. The gasket mounting groove is provided with its opening directed radially inward, and the gasket main body mounted in such a gasket mounting groove is compressed (crushed) in the axial direction (groove width direction). Also, since the split surface of the housing is often disposed in the vicinity of the gasket mounting groove, the gasket main body 53 exhibits a sealing function so that the fluid flowing through the fluid flow path does not leak from the split surface.

  However, the gasket mounting groove may have a large variation in groove dimensions (particularly the groove width dimension) depending on the processing method and the like, and the gasket 51 with a filter is mounted on the gasket mounting groove having a large variation in groove dimensions. At the time of crushing MAX (maximum), there is a concern that the gasket main body 53 may be overcompressed, and at the time of crushing MIN (minimum), there is a concern about fluid leakage, so that a gasket that functions sufficiently in both conditions is established It is considered difficult.

  If the opening width of the mounting groove is made smaller than the design value due to variations in the processing of the mounting groove, the crushing margin of the gasket main body 53 increases, so that the above-described crushing MAX occurs at this time. On the other hand, if the opening width of the mounting groove is formed larger than the design value due to variations in the processing of the mounting groove, the crushing allowance of the gasket body 53 is reduced, so that the above-described crushing MIN occurs at this time.

JP 2002-39394 A

  In view of the above, the present invention makes it difficult for over compression to occur in the gasket body even if the opening width of the mounting groove is smaller than the design value due to variations in the processing of the mounting groove, and mounting due to variations in the processing of the mounting groove. It is an object of the present invention to provide a gasket with a filter that is less likely to cause fluid leakage even when the opening width of the groove is larger than the design value, and can satisfy any case.

  In order to achieve the above object, a gasket with a filter according to claim 1 of the present invention has a structure in which a peripheral portion of a filter is held by a gasket body made of a rubber-like elastic body, and is opened radially inward. A gasket with a filter that is mounted in a mounting groove and has a structure in which the gasket main body is compressed in the axial direction when the gasket main body is mounted in the mounting groove. There is a bent portion between the end and the fixing portion to the mounting groove, and the fixing portion is set with a tightening margin to the groove bottom surface located on the outer peripheral side, and the filter holding portion and the bent portion are When the mounting groove is not in contact with the bottom surface of the groove, and the opening width of the mounting groove is smaller than the design value due to variations in processing of the mounting groove, the bent portion is bent radially inward. When fluid pressure acts on the bent portion, the bent portion is deformed to increase the degree of bending, and when the opening width of the mounting groove is larger than the design value due to variations in the processing of the mounting groove The bent portion is hardly deformed, and the bent portion is pressed against the groove bottom surface by applying fluid pressure to the bent portion that is hardly deformed.

  The gasket with a filter according to claim 2 of the present invention is the gasket with filter according to claim 1, wherein the bent portion has a minimum outer diameter dimension of the fixed portion in the initial state of the gasket with filter. The outer diameter dimension, the inner diameter dimension of the fixed portion, and the outer diameter dimension of the filter holding portion are smaller than each other.

  In the gasket with a filter of the present invention having the above-described configuration, the gasket body is not squeezed or block-shaped, and has a shape having a bent portion between the filter holding portion at one axial end and the fixed portion at the other axial end. Of these, the fixing portion is set with a tightening margin to the bottom surface of the groove located on the outer peripheral side, and the filter holding portion and the bent portion are not in contact with the bottom surface of the groove. As the name suggests, the bent part is easily bent and deformed under a compressive load.

  Thus, in the present invention, when the opening width of the mounting groove is smaller than the design value due to variations in the processing of the mounting groove, the bent portion bends inward in the radial direction, and fluid pressure acts on the bent portion. Thus, the bent portion is deformed to increase the degree of bending. Therefore, the occurrence of over-compression is suppressed by bending and deforming the bent portion.

  In addition, when the opening width of the mounting groove is larger than the design value due to variations in the processing of the mounting groove, the bent portion hardly deforms, and fluid pressure acts on the bent portion that is hardly deformed, so that the bent portion is Pressed against the bottom of the groove. Therefore, since the sealing portion is exhibited by pressing the bent portion against the groove bottom in this way, the occurrence of fluid leakage is suppressed.

  In order for the bent portion to perform the above two actions, it is desirable that the bent portion be bent to some extent from its initial state, and the bent portion has a minimum outer diameter that is the outer diameter of the fixed portion and the fixed portion. It is desirable that the inner diameter dimension and the outer diameter dimension of the filter holding portion be smaller than each other.

  The present invention has the following effects.

  That is, in the present invention, as described above, when the opening width of the mounting groove is smaller than the design value due to variations in the processing of the mounting groove, the bent portion bends inward in the radial direction, and the bent portion is fluidized. When the pressure acts, the bent portion is deformed to increase the degree of bending. Accordingly, since the bent portion is bent and deformed in this way, the gasket main body acts to avoid the compressive load (crushing load) in the axial direction, so that the over compression of the gasket main body is suppressed. Therefore, the durability of the gasket body is enhanced.

  In addition, when the opening width of the mounting groove is larger than the design value due to variation in the processing of the mounting groove, the bent portion is hardly deformed, and fluid pressure acts on the bent portion that is hardly deformed, so that the bent portion becomes a groove. Pressed against the bottom. Accordingly, since the sealing portion is exhibited by pressing the bent portion against the groove bottom in this way, the occurrence of fluid leakage is suppressed. Therefore, the original sealing function of the gasket can be sufficiently exhibited.

Sectional drawing of the gasket with a filter concerning the example of the present invention. Explanatory drawing which shows the initial state and deformation state of the gasket with the filter Sectional view of gasket with filter according to conventional example

The present invention includes the following embodiments.
(1) The gasket with filter used for the housing with large variations in groove dimensions due to the processing method, etc. may be over-compressed during crushing MAX, and there is concern about seal leakage during crushing MIN. It is difficult to establish a gasket that can be used in
(2) Therefore, in the present invention, the film is provided with a bending point, the rigidity of the lower part of the film is increased, and there is a margin for fastening with the housing on the outer peripheral side.
(3) At the time of crushing MAX, the strain applied to the film is absorbed by the film bending. Moreover, at the time of crushing MIN, a film | membrane is pressed on the outer peripheral side, Therefore A leak can be suppressed. With this shape, even a housing groove with a small difference in inner and outer diameters can be handled. In addition, the difference in strain between pressurization and SET is reduced, and it is difficult to cause fatigue failure of the film due to repeated pressurization. Since the lower part of the membrane has a tightening allowance, it also has an effect of preventing falling off during assembly.
(4) Since the conventional shape has a groove in the mating housing, even when compressed and pressure is applied, the seal does not fall inside and does not block the mesh portion. There is a setting for receiving the filter during pressurization. Since the squeeze variation is small, even if the minimum squeeze allowance is secured, the squeeze MAX does not cause overcompression. Therefore, the conventional shape cannot be set under the following conditions. Cannot take the difference between the inner and outer diameter The filter tray cannot be set. Large crushing variation.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a cross section of an initial state (free state) of a gasket 11 with a filter according to an embodiment of the present invention. The gasket 11 with a filter according to this embodiment has a disk-like or flat plate-like filter 21 made of mesh or the like, and is held by a rubber-like elastic gasket main body 31 in which a peripheral edge 21a of the filter 21 forms an annular shape. Has been. Further, as shown in FIG. 2, the filter-equipped gasket 11 according to this embodiment is mounted in a gasket mounting groove 43 opened radially inward, and the gasket body 31 is mounted in the gasket mounting groove 43. When this is done, the gasket body 31 is compressed in the axial direction (groove width direction). The gasket mounting groove 43 is provided as an annular groove around the fluid flow path 42 provided in the housing 41, and its cross-sectional shape is rectangular, a cylindrical groove bottom surface 43a, and a pair of groove side surfaces 43b perpendicular to the axis, 43c. A split surface 44 of the housing 41 is provided in the vicinity of the gasket mounting groove 43.

  The gasket main body 31 made of a rubber-like elastic body has a filter holding portion 32 at one end in the axial direction and a fixing portion 33 to the mounting groove 43 at the other end in the axial direction. It is provided integrally. The rubber-like elastic body is, for example, acrylic rubber.

The fixed portion 33 has a predetermined radial width and axial length, and has a cylindrical outer peripheral surface 33a, a cylindrical inner peripheral surface 33b, and an axially perpendicular end surface 33c. The outer diameter d ₁ of the fixing portion 33 in the initial state is set to be larger than the diameter d ₂ (not shown) of the groove bottom surface 43 a of the mounting groove 43, so that the fixing portion 33 has a groove located on the outer peripheral side thereof. A tightening margin for the bottom surface 43a is set.

The filter holding portion 32 has a predetermined radial width and axial length, and has a cylindrical outer peripheral surface 32a, a cylindrical inner peripheral surface 32b, and an axially perpendicular end surface 32c. The outer diameter dimension d ₃ of the filter holding part 32 in the initial state is set smaller than both the outer diameter dimension d ₁ of the fixing part 33 and the diameter dimension d ₂ of the groove bottom surface 43 a of the mounting groove 43, and thus the filter holding part 32. Is not in contact with the groove bottom surface 43 a together with the bent portion 34. An annular step 32d is provided on the end face 32c. This may be a bead shape, and the stepped portion 32d and the bead portion have an effect of improving the sealing performance. Further, the step portion 32d also has an effect that it is easy to set an injection port at the time of molding (an injection port provided in the mold for injecting a molding material into the mold cavity).

The bent portion 34 has a predetermined radial width and an axial length, is formed into a film that is gently curved as a whole, and is provided with a concave portion 34b having an arcuate cross section on the outer peripheral surface 34a. . Bottom of the recess 34b (deepest) forms a minimum outer diameter d ₄ of the bent portion 34, the minimum outer diameter d ₄ is the inner diameter of the outer diameter d _1, the fixing portion 33 of the fixing portion 33 d ₅ and the outer diameter dimension d ₃ of the filter holding part 32 are set smaller. The upper end portion of the concave portion 34b is gently connected to the outer peripheral surface 32a of the filter holding portion 32 via the curved surface portion, and the lower end portion of the concave portion 34b is also gently connected to the outer peripheral surface 33a of the fixing portion 33 via the curved surface portion. ing.

On the other hand, the inner peripheral surface 34c of the bent portion 34 has a cylindrical surface portion 34d, and the fixing portion 33 is gently formed through a curved surface portion 34e whose inner diameter dimension gradually increases from the cylindrical surface portion 34d. Of the inner peripheral surface 33b. The minimum outer diameter d ₄ of the bent portion 34 as described above is set to be smaller than the inner diameter d ₅ of the fixing portion 33, than the inner diameter d ₅ of the minimum inner diameter dimension d ₆ also fixing portion 33 of the bent portion 34 It is set small.

  Accordingly, the bent portion 34 has a concave portion 34b having an arc-shaped cross section on the outer peripheral surface 34a, and has a cylindrical surface portion 34d and a curved portion 34e whose inner diameter dimension gradually increases on the inner peripheral surface 34c. Therefore, it is formed into a shape bent toward the inside in the radial direction to some extent from the initial state.

  As described above, the filter-equipped gasket 11 is mounted in the gasket mounting groove 43 that opens radially inward. When the gasket main body 31 is mounted in the gasket mounting groove 43, the gasket main body 31 is It is in a state compressed in the axial direction. Here, the gasket mounting groove 43 may have a large variation in groove dimensions (particularly the groove width dimension) depending on its processing method, etc., and the gasket 11 with a filter operates (deforms) as follows according to this. .

  That is, when the opening width (groove width) of the gasket mounting groove 43 is smaller than the design value (threshold value) due to variations in the processing of the gasket mounting groove 43, the bent portion in the mounting state as shown in the middle row of FIG. 34 is bent inward in the radial direction, and when fluid pressure acts on the bent portion 34, the bent portion 34 is deformed so as to increase (deepen) the degree of bending as shown in the lower part of the left column in FIG. To do. Accordingly, since the bent portion 34 is bent and deformed in this way, the gasket main body 31 acts to avoid the compressive load in the axial direction, so that the over compression of the gasket main body 31 is suppressed. Therefore, the durability of the gasket body 31 can be enhanced.

  Further, when the opening width (groove width) of the gasket mounting groove 43 is larger than the design value (threshold value) due to variations in the processing of the gasket mounting groove 43, the bent portion in the mounting state as shown in the middle row of FIG. 34 is not deformed, and when a fluid pressure acts on the undeformed bent portion 34, the bent portion 34 is pressed against the groove bottom surface 43 a of the gasket mounting groove 43 as shown in the lower row of FIG. Therefore, since the sealing portion is exhibited by pressing the bent portion 34 against the groove bottom surface 43a in this way, the occurrence of fluid leakage is suppressed. Therefore, the original sealing function of the gasket can be sufficiently exhibited.

  The bent portion 34 is also referred to as a film portion because of its shape, and is also referred to as a flexible portion or an easily deformable portion because of its function.

11 Gasket with filter 21 Filter 21a Peripheral portion 31 Gasket body 32 Filter holding portion 32a, 33a, 34a Outer peripheral surface 32b, 33b, 34c Inner peripheral surface 32c, 33c End surface 32d Stepped portion 33 Fixed portion 34 Bending portion 34b Recessed portion 34d Cylindrical surface shape Part 34e Curved part 41 Housing 42 Fluid flow path 43 Gasket mounting groove 43a Groove bottom face 43b, 43c Groove side face 44 Split face

Claims (2)

The filter has a structure in which the peripheral edge of the filter is held by a rubber-made elastic gasket main body, and is mounted in a gasket mounting groove opened radially inward, and when the gasket main body is mounted in the mounting groove, A gasket with a filter that is compressed in the axial direction,
The gasket body has a bent portion between a filter holding portion at one axial end and a fixing portion to the mounting groove at the other axial end,
The fixing portion is set with a tightening margin to the groove bottom surface located on the outer peripheral side thereof, and the filter holding portion and the bent portion are not in contact with the groove bottom surface,
When the opening width of the mounting groove is smaller than a design value due to variations in the processing of the mounting groove, the bent portion is bent inward in the radial direction, and fluid pressure acts on the bent bent portion. The bent part is deformed to increase the degree of bending,
When the opening width of the mounting groove is larger than the design value due to variations in the processing of the mounting groove, the bent portion is hardly deformed, and fluid pressure acts on the bent portion that is hardly deformed, thereby causing the bending. A gasket with a filter, wherein the portion is pressed against the groove bottom surface. The gasket with filter according to claim 1,
In the initial state of the gasket with filter, the bent portion has a minimum outer diameter dimension smaller than any of the outer diameter dimension of the fixed portion, the inner diameter dimension of the fixed portion, and the outer diameter dimension of the filter holding portion. A gasket with a filter.

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