JP6243647B2 - Metal substrate gasket - Google Patents

Description

  The present invention relates to a gasket according to a sealing technique, and more particularly to a flat metal substrate gasket. The gasket of the present invention is used, for example, in the field related to automobiles or used in other fields.

  In a metal substrate gasket made of a single metal substrate or a metal substrate gasket having a rubber layer 52 coated on the surface of a metal substrate 51 as shown in FIG. 6, a seal bead (not shown) is formed on the flat surface. By compressing the seal bead at the time of mounting, for example, an internal pressure in an automobile engine is sealed, and at the same time, foreign matters such as water from the outside are sealed. The seal bead is effective to increase the contact surface pressure (seal surface pressure) by forming the seal bead as a line contact, and is also necessary to make the gasket follow the flatness of the mating surface.

  Nowadays, in order to improve fuel economy, it is essential to reduce the size and weight of covers (also called flanges) that are stacked on chassis such as engines, auxiliary machinery, EV and HEV inverters. There is a response request.

  However, since the cover becomes less rigid as the cover thickness is reduced, the cover is deformed when the bolt is tightened (the cover is deformed even if no gasket is incorporated), the seal bead compression amount is insufficient, and sufficient sealing performance is obtained. There is a concern that it will not be possible. In addition to the above, since the deformation amount of the cover increases as the distance between the plurality of bolts becomes longer, the seal bead compression amount may be insufficient due to this, and sufficient sealability may not be obtained. In addition to the above, there is also a demand for a reduction in the width of the sealing surface.

Japanese Utility Model Publication No. 5-30633

  In view of the above, the present invention provides a metal substrate gasket to be mounted between a housing and a cover, which has a function to compensate for the low rigidity of the cover, and thus the seal bead compression amount is insufficient due to the low rigidity of the cover. An object of the present invention is to provide a gasket capable of suppressing the shortage of the above.

  In order to achieve the above object, a gasket according to claim 1 of the present invention is a flat metal substrate gasket that is mounted between a casing and a cover that overlaps the casing, and is between the casing and the cover and on the casing side. A first gasket member disposed on the cover side, a second gasket member disposed on the cover side, and a coupling means for coupling the two gasket members, wherein the first gasket member is a housing side surface of the metal substrate. And a seal bead is formed to rise toward the second gasket member, and the second gasket member is made of a gasket material with a rubber layer coated on the cover side surface of the metal substrate. And the second gasket side surface of the metal substrate in the first gasket member and Characterized in that one or both the rubber layer also of the first gasket side surface of the metal substrate in the second gasket member is coated.

The gasket according to claim 2 of the present invention, the metal substrate gasket according to claim 1, wherein the above, the connecting means is characterized by consisting of caulking rivets.

  In the gasket of the present invention having the above-described configuration, the first gasket member disposed on the housing side and the second gasket member disposed on the cover side are combined, and both gasket members are connected by a connecting means. The first gasket member is made of a gasket material in which a rubber layer is coated on the housing side surface of the metal substrate, and a seal bead is formed to rise toward the second gasket member. On the other hand, the second gasket member is made of a gasket material in which a rubber layer is coated on the cover side surface of the metal substrate, and the seal bead is not formed but is formed in a flat plate shape.

  Therefore, when a gasket having the above configuration is mounted between the housing and the cover and bolted, the seal bead formed on the first gasket member is pressed against the second gasket member instead of the cover and elastically deformed. By interposing the second gasket member between the seal bead and the cover, the rigidity of the cover is substantially reinforced. Therefore, even if the cover has low rigidity, the amount of compression of the seal bead is increased and the repulsive force of the seal bead is increased, so that the sealing performance by the seal bead can be improved.

  In addition, since the rubber layer is coated on the housing side surface of the metal substrate in the first gasket member, the space between the metal substrate and the housing is sufficiently sealed by the rubber layer. Since the rubber layer is coated on the cover side surface of the metal substrate in the second gasket member, the metal substrate and the cover are sufficiently sealed by the rubber layer. In addition, a rubber layer is coated on one or both of the second gasket side surface of the metal substrate in the first gasket member and the first gasket side surface of the metal substrate in the second gasket member. Fully sealed.

  Moreover, in the gasket of the said structure, although the 2nd gasket member was left flat, when the uneven | corrugated shape by embossing was formed in this 2nd gasket member, since the rigidity of a 2nd gasket member will increase, The reinforcing effect is further increased. As the uneven shape by embossing, it is preferable that a concave portion is provided on the cover side surface of the second gasket member and a convex portion is provided on the first gasket member side surface. Since the shape is raised and formed toward the first gasket member, the three-dimensional structure with the concavo-convex shape has a reinforcing effect on the cover.

  The first and second gasket members are connected by connecting means. As the connecting means, since both the first and second gasket members have metal parts, a high-strength cashmere bed is suitable.

  The present invention has the following effects.

  That is, in the present invention, as described above, when the gasket is mounted between the housing and the cover and fastened with the bolt, the seal bead formed on the first gasket member is pressed against the second gasket member, not the cover, and is elastic. Due to the deformation, the second gasket member is interposed between the seal bead and the cover, so that the rigidity of the cover is substantially reinforced. Therefore, even if the cover has low rigidity, the amount of compression of the seal bead is increased and the repulsive force is increased, so that the sealing performance can be improved. In other words, by using the gasket of the present invention, it is possible to further promote the reduction in rigidity (weight reduction / miniaturization) of the cover and the reduction in the width of the seal surface.

  Further, each rubber layer sufficiently seals between the metal substrate and the casing of the first gasket member, between the metal substrate and the cover of the second gasket member, and between the metal substrate of the first gasket member and the metal substrate of the second gasket member. be able to.

  Moreover, since the rigidity of a 2nd gasket member increases by forming the uneven | corrugated shape by embossing in a 2nd gasket member, the reinforcement effect with respect to a cover can be expanded further.

The top view of the gasket which concerns on the Example of this invention The main part expanded sectional view of the gasket, and the CC sectional expanded sectional view in FIG. Sectional drawing of the principal part of the gasket which concerns on 2nd Example of this invention. Sectional drawing of the principal part of the gasket which concerns on 3rd Example of this invention. Sectional drawing of the principal part of the gasket which concerns on 4th Example of this invention. Cross-sectional view of the main part of the gasket according to the conventional example

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

First embodiment
FIG. 1 shows an overall plan view of a gasket 1 according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the main part of the gasket 1 and shows an enlarged cross-sectional view taken along the line CC in FIG. In FIG. 2, a housing 41 and a cover 42, which are mounting counterparts, are also drawn, with the housing 41 and the cover 42 on the right side in the drawing being the housing internal side D and the left side in the drawing being the atmosphere side E. FIG. 2 shows a state before the bolt is fastened.

  The gasket 1 according to this embodiment is a flat metal substrate gasket that is mounted between a casing 41 and a cover 42 that overlaps the casing 41, and is between the casing 41 and the cover 42 and on the casing 41 side (in FIG. The first gasket member 11 disposed on the side) and the second gasket member 21 disposed on the cover 42 side (upper side in FIG. 2) have a combined structure. Are connected through.

  The first gasket member 11 is made of a flat gasket material in which a rubber layer (elastic body) 13 is coated (adhered) to a housing side surface (lower surface in FIG. 2) of a metal substrate (base material) 12, and a flat seal is provided on the flat surface. A seal bead 14 is formed to rise toward the second gasket member 21 in the plane.

  On the other hand, the second gasket member 21 is made of a flat gasket material in which a rubber layer (elastic body) 23 is coated (adhered) to the cover side surface (upper surface in FIG. 2) of the metal substrate (base material) 22. The side is formed in a flat plate shape without forming a seal bead.

  Further, the rubber layer (elastic body) 15 is also coated (adhered) to the second gasket side surface (the upper surface in FIG. 2) of the metal substrate 12 in the first gasket member 11, and therefore the first gasket member. Eleven metal substrates 12 are coated with rubber layers 13 and 15 on both sides in the thickness direction.

  The metal substrates 12 and 22 are made of a steel plate, and are made of a metal plate such as stainless steel, cold-rolled steel plate, galvanized steel plate, or aluminum plywood. The rubber compound for forming the rubber layers 13, 15 and 23 is made of synthetic rubber (including foamed rubber) containing at least one of nitrile rubber, styrene butadiene rubber, fluorine rubber, acrylic rubber and silicon rubber. The seal bead 14 is made of a full bead having a circular arc cross section, and the seal bead 14 made of a full bead is provided over the entire circumference of the first gasket member 11.

  Further, the connecting means 31 is made of a caulking rivet having heads at both upper and lower ends, and the connecting means 31 made of the caulking rivet holds the gasket members 11 and 12 in parallel with each other.

  As shown in FIG. 1, the gasket 1 is formed into a rectangular frame as a whole, and is provided with a plurality of protruding portions 2 on the circumference (three locations in the figure). A connecting means 31 is attached. Therefore, the first and second gasket members 11 and 21 are connected via the connecting means 31 over a plurality of locations on the circumference.

  The gasket 1 having the above-described configuration has a combined structure of the first and second gasket members 11 and 21 as described above, and both the gasket members 11 and 21 are connected via the connecting means 31. The first gasket member 11 is made of a flat gasket material in which a rubber layer 13 is coated on the housing side surface of the metal substrate 12, and a seal bead 14 is raised and formed toward the second gasket member 21 in the plane. Yes. On the other hand, the second gasket member 21 is made of a flat gasket material in which a rubber layer 23 is coated on the cover side surface of the metal substrate 22 and is formed in a flat plate shape without forming a seal bead.

  Therefore, when the gasket 1 having the above configuration is mounted between the housing 41 and the cover 42 and bolted, the seal bead 14 formed on the first gasket member 11 is pressed against the second gasket member 21 instead of the cover 42 to be elastic. Since the second gasket member 21 is interposed between the seal bead 14 and the cover 42, the rigidity of the cover 42 is substantially reinforced. Therefore, the amount of compression of the seal bead 14 increases and the repulsive force of the seal bead 14 increases, so that the sealing performance by the seal bead 14 can be improved. In other words, by using the gasket 1 having the above-described configuration, the cover 42 can be further reduced in rigidity, size, weight, and the width of the seal surface.

  Further, between the metal substrate 12 and the housing 41 of the first gasket member 11, between the metal substrate 22 and the cover 42 of the second gasket member 21, and between the metal substrate 12 of the first gasket member 11 and the metal substrate 22 of the second gasket member 21. Since the rubber layers 13, 15, and 23 are interposed, the sufficient sealing effect can be exhibited even when the flatness of each metal part is insufficient or there is a gap between the metal parts. .

  Moreover, since the 2nd gasket member 21 contacts the cover 42 in a wide range, the effect of a cast hole countermeasure can also be exhibited.

  The effects of each component are as follows.

  The metal substrate 22 of the second gasket member 21 can contribute to an increase in the rigidity of the cover 42, and by suppressing the deformation of the cover 42, it is possible to reduce an insufficient compression rate of the seal bead 14. The thicker the metal substrate 22 is, the more advantageous is the sealing performance.

  The rubber layer 23 of the second gasket member 21 can cause the gasket 1 to follow the roughness of the surface of the cover 42 that is the seal counterpart surface. In this embodiment, the aim of providing the rubber layer 23 only on one side of the metal substrate 22 is to reduce stress relaxation.

  The first gasket member 11 can push the metal substrate 22 of the second gasket member 21 by generating a reaction force on the seal bead 14. Further, the deformability of the seal bead 14 can improve the followability with respect to the flatness of the counterpart.

  The connecting means 31 can improve the assembly property (workability) of the gasket 1 by assembling the first and second gasket members 11 and 21 in advance.

Second embodiment ...
In the first embodiment, the seal bead 14 formed on the first gasket member 11 is a full bead, but the structure of the seal bead 14 is not particularly limited, and has, for example, a rising slope with a linear cross section as shown in FIG. Half beads may be used. In the illustrated half bead, the outside of the slope is in contact with the housing 41 and the inside of the slope is in contact with the second gasket member 21.

Third embodiment
In the first embodiment, the second gasket member 21 remains flat, but the second gasket member 21 is formed in the thickness direction by forming an uneven shape (concave shape) by embossing on the second gasket member 21. 3D, the rigidity of the second gasket member 21 is increased (due to the increase in the section modulus (bending rigidity) of the metal substrate 22 and the progress of work hardening). Since the contact area of the second gasket member 21 with respect to the surface is reduced, the contact surface pressure is increased and the sealing performance is improved.

  As the uneven shape 24 by embossing, for example, as shown in FIG. 4, a concave portion 25 is provided on the cover side surface of the second gasket member 21 and a convex portion 26 is provided on the first gasket member side surface. Thus, it is assumed that the concavo-convex shape 24 by embossing is raised and formed toward the first gasket member 11. The concavo-convex shape 24 has a pair of inner and outer rising portions 27 and a flat portion 28 parallel to the metal substrate 22, and is provided over the entire circumference of the second gasket member 21. The seal beads 14 of the first gasket member 11 are in close contact. The seal bead 14 is made of a full bead having an arc cross section, and the seal bead 14 made of a full bead is provided over the entire circumference of the first gasket member 11.

  The effects of providing the concavo-convex shape 24 by the embossing will be described collectively as follows.

  That is, first, by providing the metal substrate 22 with the concavo-convex shape 24 by embossing, not only the thickness of the substrate but also an increase in the section modulus (bending rigidity) and an increase in the rigidity of the cover 42 which is also affected by the work hardening of the substrate are realized. can do. Further, by providing the metal substrate 22 with the concavo-convex shape 24 by embossing, the contact area with respect to the cover 42 is reduced as compared with the first embodiment (which remains flat). Increases, and the sealing performance can be improved.

Fourth embodiment
In the said 3rd Example, although the seal bead 14 formed in the 1st gasket member 11 was made into a full bead, the structure of the seal bead 14 is not specifically limited, For example, it has a rising slope with a linear cross section as shown in FIG. Half beads may be used. In the illustrated half bead, the outside of the slope is in contact with the housing 41 and the inside of the slope is in contact with the second gasket member 21.

DESCRIPTION OF SYMBOLS 1 Gasket 2 Overhang | projection part 11 1st gasket member 12,22 Metal substrate 13,15,23 Rubber layer 14 Seal bead 21 2nd gasket member 24 Concave and convex shape 25 Concave part 26 Convex part 27 Standing part 28 Planar part 31 Connecting means 41 Housing 42 cover

Claims (2)

A flat metal substrate gasket mounted between a casing and a cover stacked on the casing,
A first gasket member disposed on the housing side between the housing and the cover, a second gasket member disposed on the cover side, and a coupling means for coupling the gasket members;
The first gasket member is formed of a gasket material in which a rubber layer is coated on the housing side surface of the metal substrate, and a seal bead is raised and formed toward the second gasket member,
The second gasket member is formed of a gasket material in which a rubber layer is coated on the cover side surface of the metal substrate and is formed in a flat plate shape,
One or both of the second gasket side surface of the metal substrate in the first gasket member and the first gasket side surface of the metal substrate in the second gasket member are coated with a rubber layer. . The metal substrate gasket according to claim 1 , wherein
The metal substrate gasket according to claim 1, wherein the connecting means is made of a cashmere bed.

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