JP2022018225A - gasket - Google Patents

Abstract

To provide a gasket capable of realizing appropriate sealing performance just as designed, and having high assembling performance.SOLUTION: A gasket 1 made of an elastic body for sealing between one member 2 and the other member 3 joined in opposition thereto includes; a gasket main body 10 disposed in a manner of being fitted to a groove 20 formed on the one member; and flange portions 100, 100 formed in a manner of projecting from both side portions of the gasket main body in a groove width direction. The gasket main body has: flat-shaped portions 11 formed along flat-shaped surfaces 21; an arc-shaped portion 12 formed along an arc-shaped surface 22; and angular portions 13 where the flat-shaped portion and the arc-shaped portion cross with each other. The arc-shaped portion has a taper portion 12a of which a face opposed to the arc-shaped surface of the other member, is inclined toward the flat-shaped portion, and the angular portion has a projecting portion 13a formed in a manner of projecting toward a flat-shaped surface side of the other member with respect to the flat-shaped portion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a gasket mounted in a groove formed in one member in order to seal between the two members.

Among the gaskets as described above, the gasket that seals between one member having a flat surface and an arcuate surface formed continuously thereof and the other member formed according to the shape of one member is flat. It is difficult to seal the square surface where the shaped surface and the arc-shaped surface intersect, and the gap created is filled with a liquid gasket.
Therefore, in order to improve the sealing property, Patent Document 1 below discloses a gasket provided with a protrusion having a thickness protruding in the groove width direction at a portion for sealing a corner surface.

Japanese Patent Application Laid-Open No. 2003-2137

However, in the case of the gasket disclosed in Patent Document 1, when one member is united with the other member, the protrusion has too much volume, and the protrusion comes into contact with the arcuate surface of the other member, causing curling or misalignment. There is a possibility, and if it is assembled in that state, a gap will occur and the sealing performance as designed cannot be exhibited. Further, when one member or the other member is made of resin or the like and has low rigidity, the protrusion may cause excessive filling, which may cause deformation of the resin member.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gasket which can realize a sealing property according to an appropriate design and has a good assembling property.

The gasket according to the present invention is formed by continuously forming a one-sided member having a flat-shaped surface and an arc-shaped surface formed continuously thereof, and a flat-shaped surface united with the flat-shaped surface of the one member. A gasket made of an elastic body having an arc-shaped surface and an arc-shaped surface to be united and sealing between the other member facing and joining the one member, and being fitted into a groove formed in the one member. The gasket body is provided with a gasket body to be mounted and a flange portion formed by projecting from both side portions of the gasket body in the groove width direction, and the gasket body is formed with a flat shape portion formed along the flat shape surface. It has an arc-shaped portion formed along the arc-shaped surface and a corner portion where the flat-shaped portion and the arc-shaped portion intersect, and the arc-shaped portion is formed on the arc-shaped surface of the other member. The facing surface has a tapered portion inclined toward the flat-shaped portion, and the corner portion has a protruding portion formed so as to project from the flat-shaped portion toward the flat-shaped surface side of the other member. It is characterized by being.

According to the gasket of the present invention, since the arc-shaped portion of the gasket has a tapered portion, the tapered portion is elastically contacted with the square surface where the flat-shaped surface and the arc-shaped surface on the other member side, which are difficult to seal, intersect. It is possible to achieve the sealing performance as designed properly. Further, since the protruding portion is formed so as to project from the flat-shaped portion toward the flat-shaped surface side of the other member, it is possible to seal the other member without creating a gap on the square surface of the other member.

According to the gasket according to the present invention, the sealing property according to an appropriate design can be realized, and the assembly property can be improved.

It is a schematic front view which shows typically the main part of the gasket which concerns on one Embodiment of this invention. It is a partially enlarged view for demonstrating the structure around the corner part of the gasket, and is the X part enlarged view in FIG. (A) and (b) are partially enlarged views for explaining the structure around the corners of the gasket, (a) is a schematic perspective view seen from the direction indicated by arrow A in FIG. 2, and (b) is a diagram. It is a schematic perspective view seen from the direction of arrow B in 2. (A) is a sectional view taken along line YY in FIG. 2, and (b) is a schematic sectional view of a state in which the gasket is fitted in a groove of the head cover. (A) is a sectional perspective view taken along line ZZ in FIG. 2, and (b) is a schematic perspective view when FIG. 2 is viewed in a plan view. (A) and (b) are schematic front views schematically showing a state in which the gasket is attached to the head cover of the cylinder head. (A) is a diagram for explaining a state before the head cover is combined with the cylinder head, and (b) is a diagram for explaining a state after the head cover is combined with the cylinder head.

Hereinafter, embodiments of the present invention will be described.
The gasket according to the present embodiment seals between one member and the other member, and is fitted and mounted in a groove formed in the one member. On the other hand, the member has a flat-shaped surface and an arc-shaped surface formed continuously thereof. The other member has a flat-shaped surface that is united with the flat-shaped surface of the one member and an arc-shaped surface that is continuously formed and united with the arc-shaped surface of the one member. The gasket includes a gasket body that is fitted and mounted in a groove formed in one member, and a flange portion that projects from both sides of the gasket body in the groove width direction. The gasket body has a flat-shaped portion formed along the flat-shaped surface of the one member and the other member, an arc-shaped portion formed along the arc-shaped surface of the one member and the other member, and the flat-shaped portion. The arc-shaped portion has a corner portion where the arc-shaped portion intersects with the arc-shaped portion, and the arc-shaped portion has a tapered portion in which a surface of the other member facing the arc-shaped surface is inclined toward the flat-shaped portion. .. The corner portion has a protruding portion formed so as to project from the flat-shaped portion toward the flat-shaped surface side of the other member.
Hereinafter, a detailed description will be given with reference to the drawings. It should be noted that some of the figures omit some of the detailed reference numerals attached to the other figures.

1 to 6 show an example of a gasket according to the present embodiment.
The gasket 1 in the present embodiment is suitably used as a gasket for sealing between two members, one member having a semicircular arch portion and the other member. Therefore, the one member and the other member may be, for example, two opposing members of the head cover, the cylinder head, the cylinder block, the oil pan, and the chain cover constituting the engine of the automobile, and the other two members. You may.
Hereinafter, an example in which the gasket 1 of the present embodiment is applied to the head cover gasket mounted between the cylinder head 3 (the other member) of the engine mounted on the automobile and the head cover 2 (the other member) will be described. The head cover 2 is made of a molded product such as resin, and is provided so as to cover and cover the upper surface of the cylinder head 3. The peripheral edge portion of the head cover 2 is formed with a flange portion 2a protruding outward in a flange shape, and the flange portion 2a is a bolt through which a bolt for fastening to the peripheral edge portion of the cylinder head 3 and being integrated is inserted. A hole (not shown) is provided. The shape and size of the arch portion 30 of the cylinder head 3 is such that the camshaft (not shown) horizontally installed on the cylinder head 3 is connected to the drive transmission member installed outside the cylinder head 3. It is formed according to the shape and size.

As shown in FIG. 1, in the flange portion 2a of the head cover 2, the flat-shaped surface 21, the arc-shaped surface 22 continuously formed on the flat-shaped surface 21, and the flat-shaped surface 21 and the arc-shaped surface 22 intersect with each other. It has a corner surface (pin angle) 23. The arc-shaped surface 22 is formed so as to be integrated with the arc-shaped surface 32 of the arch portion 30 in the cylinder head 3. Specifically, the arcuate surface 22 is formed in a curved shape in which the central portion is convex upward according to the shape and size of the arch portion 30, that is, a semicircular arch shape, and both sides of the arcuate surface 22 are formed. Has flat shaped surfaces 21 and 21 formed on the surface. Further, in the flange portion 2a of the head cover 2, a concave groove 20 into which the gasket 1 is fitted is formed in an annular shape in the circumferential direction. The groove 20 in the example has an opening 20c having an opening at the bottom, side wall portions 20a and 20a, a bottom portion 20b, and a wall surface corner portion 20d (see FIG. 4B). The depth dimension and shape of the groove 20 are formed according to the shape of the gasket 1. In the groove 20 in the present embodiment, as shown in FIG. 4B, the flanges 100 and 100 of the gasket 1 are the grooves 20. It is provided so as to protrude from the opening 20c of the gasket body 10 and most of the gasket body 10 fits in the groove 20.

The peripheral edge portion of the cylinder head 3 to be joined to the flange portion 2a of the head cover 2 has a flat-shaped surface 31 and an arc-shaped surface 32 continuously formed on the flat-shaped surface 31. Similar to the arc-shaped surface 22 of the head cover 2, the arc-shaped surface 32 formed on the cylinder head 3 also has a curved shape in which the central portion is convex upward according to the shape and size of the arch portion 30, that is, a semicircle. The arc-shaped surfaces 32 are formed in an arch shape, and flat-shaped surfaces 31 and 31 are formed on both sides of the arc-shaped surface 32.

Since the head cover 2 and the cylinder head 3 are joined and united with each other, the flat shaped surface 21 of the head cover 2 is formed corresponding to the flat shaped surface 31 of the cylinder head 3, and the arc shaped surface 32 of the cylinder head 3 is formed. Correspondingly, the arc-shaped surface 22 of the head cover 2 is formed. A gasket 1 is provided to seal the combined surface of the head cover 2 and the cylinder head 3. Therefore, when the head cover 2 is fastened to the cylinder head 3 with bolts, the flat shaped surfaces 21 and 31 to be sealed are sealed to each other by elastic deformation of the gasket 1 due to compression by tightening (see FIG. 4 (b)). ), The arc-shaped surfaces 22 and 32 are also sealed.

The gasket 1 includes a gasket main body 10 that is fitted and mounted in the groove 20, and flange portions 100 and 100 that are formed so as to project from both side portions of the gasket main body 10 in the groove width direction. The gasket main body 10 is formed in a vertically long rectangular shape in a cross-sectional view, and the flange portion 100 is formed on the lower side (rear side in the insertion direction into the groove 20) of the gasket main body 10. When the gasket 1 is attached to the groove 20, the flange portions 100 and 100 are exposed in the groove width direction as shown in FIGS. 4 (b) and 6 (a).
As shown in FIG. 1 and the like, the gasket body 10 and the flange portions 100, 100 are integrally formed molded products, and the elasticity of rubber or the like centering on NBR, H-NBR, ACM, AEM, FKM, etc. Formed using wood. The gasket main body 10 and the flange portion 100 have flat shape portions 11, 111, arc shape portions 12, 112, and corner portions 13, 113, respectively.
Specifically, the gasket main body 10 includes a flat shape portion 11 formed along the flat shape surface 21 of the flange portion 2a, an arc shape portion 12 formed along the arc shape surface 22 of the flange portion 2a, and the like. It has a corner portion 13 at which the flat shape portion 11 and the arc shape portion 12 intersect. Further, the flange portion 100 also has a flat shape portion 111 formed along the flat shape surface 21 of the flange portion 2a, an arc shape portion 112 formed along the arc shape surface 22 of the flange portion 2a, and a flat shape portion 111. It has a corner portion 113 at which the arc-shaped portion 112 and the arc-shaped portion 112 intersect.

Further, the gasket 1 is formed with protrusions 14 formed on both side surfaces 10a and 10a in a rod shape and at appropriate intervals in the direction of insertion into the groove 20. The protrusion 14 has a fall-prevention protrusion 14a and a fall-prevention protrusion 14b having a diameter larger than that of the fall-prevention protrusion 14a in addition to the fall-prevention protrusion 14a. The protrusion 14 is appropriately formed in the height direction of the side surface 10a of the gasket body 10, and the fall prevention protrusion 14a prevents the gasket body 10 from falling or meandering in the groove 20. Further, the dropout prevention protrusion 14b prevents the gasket 1 fitted in the groove 20 from falling off from the groove 20 when the head cover 2 is combined with the cylinder head 3.

The arc-shaped portion 12 of the gasket body 10 has tapered portions 12a and 12a whose surfaces facing the arc-shaped surface 32 of the cylinder head 3 are inclined toward the flat-shaped portions 11 and 11 in the lower portions on both sides thereof. There is.
As shown in FIG. 1, the angle α at which the perpendicular line L passing through the center of the arc-shaped portion 12 of the gasket body 10 and the line L1 passing through the lower portion (corner portion 13 side) of the arc-shaped portion 12 intersect is set to 15 °. , The tapered portion 12a is formed so as to be inclined along the line L1. FIG. 1 shows an example in which the angle α is set to 15 °, but when the angle α is set to 10 ° to 20 °, the effects described later are exhibited and desirable.

According to the gasket 1 of the present embodiment, since the arc-shaped portion 12 has the above-mentioned tapered portion 12a, a square surface where the flat-shaped surface 31 on the cylinder head 3 side and the arc-shaped surface 32, which are difficult to seal, intersect with each other. The tapered portion 12a is in close contact with the 33 and is in contact with the taper, so that the sealing property as designed properly can be realized. That is, when the arc-shaped portion 12 of the gasket 1 is formed along the arc-shaped surface 32 of the cylinder head 3, when the head cover 2 is combined with the cylinder head 3, the corner portion 13 of the gasket body 10 has the arc-shaped portion of the cylinder head 3. Although curling may occur when it hits the surface 32, according to the gasket 1 of the present embodiment, since the arc-shaped portion 12 has the tapered portion 12a, curling can be prevented and the assembling property is good. It can be a gasket.
The inclination of the tapered portion 12a is set according to the shape and size of the arch portion, and the angle α can be set in the range of 5 to 30 °. When the above-mentioned angle α of the tapered portion 12a is less than 5 °, there is not much difference from the case where the tapered portion 12a is not provided (when the angle α is 0 °) when the head cover 2 is combined with the cylinder head 3. Therefore, the desired function of the tapered portion 12a cannot be achieved, and the flange portion 100 tends to be curled up. On the other hand, when the angle α exceeds 30 °, the gap formed between the arc-shaped surface 32 of the cylinder head 3 and the gasket 1 becomes too large, and the sealing property tends to deteriorate.

The corner portion 13 of the gasket main body 10 has a protruding portion 13a formed so as to project from the flat shape portion 11 toward the flat shape surface 31 side of the cylinder head 3. As shown in the partially enlarged view of FIG. 2 and FIGS. 3 (a) and 3 (b), the protruding portion 13a is directed toward the flat shape surface 31 side of the cylinder head 3 rather than on the extension line of the flat shape portion 11. It is formed so as to gradually protrude (tilt). The thickness of the flange portion 100 in the protruding portion 13a (t1, see FIG. 4A) is an angle as compared with the thickness of the flange portion 100 of the portion corresponding to the flat shape portion 11 (t2, see FIG. 5A). It is formed so that the thickness gradually increases toward the portion corresponding to the portion 13. Further, the lower surface 100b of the flange portion 100 in the protrusion 13a is formed so as to be inclined toward the portion corresponding to the corner portion 13, and accordingly, the flange portion 100 protrudes in a substantially triangular shape when viewed from the front. (See Fig. 2).

As described above, according to the present embodiment, the protruding portion 13a is formed so as to project from the flat shape portion 11 toward the flat shape surface 31 side of the cylinder head 3, so that the square surface 33 of the cylinder head 3 is difficult to seal. It can be properly sealed without creating a gap between the gasket 1 and the gasket 1. Further, according to the present embodiment, the thickness of the flange portion 100 in the protruding portion 13a is formed so as to gradually increase from the portion corresponding to the flat shape portion 11 to the portion corresponding to the corner portion 13. The gasket 1 can be assembled along the flat surface 31 and the square surface 33 where the surface pressure tends to decrease can be properly sealed.
Further, in addition to the sealing by the gasket 1 described above, it is desirable to apply a liquid gasket (FIPG (Formed in Place Gasket)) to, for example, the corner surface 33 (and its surroundings). In this case, even if there is vibration or pressure fluctuation, the degree of adhesion of the gasket 1 to the corner surface 33 (and its surroundings) can be reinforced and the sealing performance can be improved.

As shown in FIG. 2, the downward protrusion (inclination) of the protrusion 13a is set so as to be elastically contacted with the square surface 33 with an appropriate surface pressure, and the flange portion in the flat shape portion 11 of the gasket body 10 is set. It is desirable that the angle β at which the extension line L2 of the lower surface 100b of 100 and the line L3 corresponding to the lower surface 100b of the protrusion 13a intersect is inclined to be 5 ° to 20 °. An example of ° is shown. Further, the lower surface 100b of the flange portion 100 in the protruding portion 13a is formed so as to be inclined toward a portion corresponding to the corner portion 13 according to the protruding condition of the protruding portion 13a. Therefore, the degree of protrusion of the flange portion 100c differs depending on the inclination angle of the lower surface 100b of the flange portion 100.
According to the gasket 1 of the present embodiment, the surface pressure of the gasket 1 can be adjusted with a simple structure in which the protruding portion 13a is formed in an inclined manner, and the square surface 33 which is difficult to seal can be more appropriately formed. Can be sealed to. When the above-mentioned angle β is less than 5 °, there is not much difference from the case where the protruding portion 13a is not formed, and there is a tendency that the desired sealing property cannot be exhibited. On the other hand, when the angle β exceeds 20 °, the surface pressure of the cylinder head 3 with respect to the flat shaped surface 31 becomes too high, and the sealing property tends to deteriorate.

A build-up portion 15 having a thickness thicker than other portions is formed between the corner portion 13 of the gasket main body 10 and the flange portion 100 continuous with the corner portion 13. Specifically, as shown in FIGS. 2 and 5B, the built-up portion 15 is formed so as to be gently raised in a substantially triangular shape in front view and plan view, and is formed on the side of the flat shape portion 11 side. The length is formed so as to be larger than the length of the side on the arc-shaped portion 12 side. Therefore, when the tapered portion 12a is in contact with the square surface 33, the protruding portion 13a is filled in a portion where a gap is likely to occur, and the built-up portion 15 has a function of pressing the protruding portion 13a. Since no gap is formed in the surface and an appropriate surface pressure can be applied to the arcuate surface 32, the square surface 33, and the flat surface 31 to be sealed, more appropriate sealing is possible.
As shown in FIG. 4A, the overlay portion 15 is formed so that the width dimension gradually increases toward the flange portion 100 in a cross-sectional view.
Therefore, according to the gasket 1 of the present embodiment, the gasket main body 10 can be smoothly inserted into the groove 20 without being stuck in the build-up portion 15 while the gasket main body 10 is being mounted in the groove 20, so that the gasket main body 10 can be inserted into the groove 20. Get better.
The build-up portion 15 has a thickness that allows the gasket main body 10 to be elastically contacted with the wall surface corner portions 20d and 20d on both sides forming the groove 20 in a state of being mounted on the groove 20.
Therefore, according to the gasket 1 of the present embodiment, since the mountability to the groove 20 is improved, it is possible to prevent the gasket 1 from falling off from the groove 20 of the head cover 2. Further, when the head cover 2 is combined with the cylinder head 3, the flange portion 100 corresponding to the corner portion 13 of the gasket main body 10 can be restrained from being rolled up, and the assembling property can be further improved.

Next, with reference to FIGS. 4 and 6, the procedure for mounting the gasket 1 in the groove 20 and the procedure for sealing between the head cover 2 and the cylinder head 3 will be further described.
The gasket 1 inserts the other surface 10b on the upper side (front side in the insertion direction into the groove 20) of the gasket body 10 from the opening 20c of the groove 20 (see FIG. 4A). Then, the other surface 10b of the gasket body 10 comes into contact with the bottom portion 20b of the groove 20 and is inserted until the gasket body 10 is elastically deformed (see FIG. 4B). At this time, both side surfaces 10a and 10a of the gasket main body 10 partially bounced on the side wall portions 20a and 20a, and the fall prevention protrusion 14a and the fall prevention protrusion 14b shown in FIG. 1 and the like bounced on the side wall portions 20a and 20a. It becomes a state. As a result, the gasket main body 10 can be smoothly assembled in an appropriate state without meandering in the groove 20 and without falling off from the groove 20. Then, in this state, the head cover 2 is arranged from above the cylinder head 3 so that the arc-shaped surface 22 and the arc-shaped surface 32 are united, and the head cover 2 is joined to the cylinder head 3 (FIG. 6A). reference). At this time, since the arc-shaped portion 12 of the gasket 1 has the tapered portion 12a, the tapered portion 12a is formed on the square surface 33 where the flat-shaped surface 31 on the cylinder head 3 side and the arc-shaped surface 32, which are difficult to seal, intersect. The corners 13 of the gasket 1 do not come into contact with the arcuate surface 32 of the cylinder head 3 and are not rolled up. Subsequently, the tapered portion 12a is joined along the arc-shaped surface 32 until the flat-shaped portion 11 of the gasket 1 comes into contact with the flat-shaped surface 31 of the cylinder head 3 (see FIG. 6B). At this time, since the protruding portion 13a is formed on the corner portion 13 of the gasket 1 and the flange protruding portion 100c is formed on the flange portion 100, the corner surface 33 and the periphery of the corner surface 33 where a gap is likely to occur and the gasket 1 are formed. There is no gap between the two, and the build-up portion 15 can have a volume, so that the sealing performance can be improved.

The shapes and configurations of the gasket 1, the head cover 2, the cylinder head 3, and the like are not limited to the examples and the above-described embodiments. Further, the gasket 1 is preferably used between two members having an arch portion 30 as shown in the figure, but is not limited to the above embodiment, and may be used for a sealing structure for sealing between various two members. good. Further, depending on the application location of the gasket 1, the above-mentioned liquid gasket may not be applied. The gasket 1 is not limited to the annular body, and may be partially provided, and the configuration of the protrusion 14 is not limited to the illustration. Further, the shapes and configurations of the protruding portion 13a, the overlay portion 15, and the flange protruding portion 100c are not limited to the illustrations. For example, the built-up portion 15 may be formed so that the length of the side on the flat shape portion 11 side is smaller than the length of the side of the arc-shaped portion 12. Further, the shapes of the flat shape portion 11 and the flat shape surfaces 21 and 31 are not limited to the flat shape as shown in the figure, and a slightly meandering portion may be formed.

1 Gasket 10 Gasket body 11 Flat shape part 12 Arc shape part 12a Tapered part 13 Square part 13a Protruding part 15 Overlay part 2 Head cover (one member)
20 Groove 20d Wall corner 21 Flat shape surface 22 Arc shape surface 23 Square surface 3 Cylinder head (other member)
31 Flat shape surface 32 Arc shape surface 33 Square surface

Claims (6)

A one-sided member having a flat-shaped surface and an arc-shaped surface formed continuously thereof, a flat-shaped surface united with the flat-shaped surface of the one member, and an arc formed continuously with the flat-shaped surface and united with the arc-shaped surface. A gasket made of an elastic body that has a shape surface and seals between the one member and the other member that is joined to each other.
The gasket body, which is fitted and mounted in the groove formed in the one member,
It is provided with a flange portion formed by projecting from both sides of the gasket body in the groove width direction.
The gasket body includes a flat-shaped portion formed along the flat-shaped surface of the one member and the other member, and an arc-shaped portion formed along the arc-shaped surface of the one member and the other member. It has a corner portion where the flat shape portion and the arc shape portion intersect with each other.
The arc-shaped portion has a tapered portion in which a surface of the other member facing the arc-shaped surface is inclined toward the flat-shaped portion.
The gasket is characterized in that the corner portion has a protruding portion formed so as to project from the flat shape portion toward the flat shape surface side of the other member. In claim 1,
A gasket characterized in that the thickness of the flange portion in the protruding portion is formed so as to gradually increase in thickness from a portion corresponding to the flat shape portion toward a portion corresponding to the corner portion. In claim 2,
A gasket characterized in that the lower surface of the flange portion of the protruding portion is formed so as to be inclined toward a portion corresponding to the corner portion. In any one of claims 1 to 3,
A gasket characterized in that a built-up portion having a thickness thicker than that of other portions is formed between the corner portion and the flange portion continuous with the corner portion. In claim 4,
The built-up portion is a gasket characterized in that the built-up portion is formed so that the width dimension gradually increases toward the flange portion in a cross-sectional view. In claim 4 or 5,
The build-up portion is a gasket having a thickness that allows the gasket main body to be elastically contacted with the corner portions of the wall surfaces on both sides forming the groove in a state of being mounted on the groove.

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