JP2007024210A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket improved in sealing performance. <P>SOLUTION: In the gasket 10 for sealing a clearance between two facing surfaces, at least one of the two surfaces is formed of a plurality of members adjacent to each other, and a liquid seal is applied to a region including at least a part of a boundary part of the adjacent members out of the seal face of the gasket 10. The region to which the liquid seal is applied, is provided with a liquid seal holding part 20 composed of a plurality of projecting parts 21, 22 and a plurality of recessed parts 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a gasket for sealing between two surfaces.

  A gasket normally seals a gap between two opposing surfaces, and generally seals a gap between two members. However, the surface to be sealed by the gasket (seal surface) may be formed by a plurality of members. In this case, since it is difficult to make this sealing surface a smooth surface without any gaps, it is difficult to exhibit stable sealing performance with only a gasket. This point will be described with reference to FIGS. 11 and 12. FIG. 11 is a schematic cross-sectional view showing a state before the gasket is mounted in a portion where the gasket is mounted. FIG. 12 is a schematic cross-sectional view showing a state in which a gasket according to a conventional example is mounted.

  For example, as shown in FIG. 11, when the chain cover 200 and the cylinder head 300 are configured separately, the gap S between the head cover 100 and the chain cover 200 and the cylinder head 300 needs to be sealed. In this case, since the chain cover 200 and the cylinder head 300 are configured separately, it is difficult to make the seal surface formed by them smooth without any gaps. A step D may occur between the cylinder head 300 and the cylinder head 300.

  For this reason, as shown in FIG. 12, when the gasket 400 is mounted between the head cover 100, the chain cover 200, and the cylinder head 300, the gap V due to the step D is generated. Must be sealed. Therefore, a technique for sealing the gap V by applying a liquid seal near the gap V is known.

However, since the application position and application amount of the liquid seal vary, the thickness of the applied liquid seal varies depending on the location. Therefore, it is difficult to securely seal the gap V, and there is still room for improvement. In addition, there exists a technique disclosed by patent documents 1-4 as a related technique. Patent Document 4 discloses a technique for forming a space for liquid sealing and sealing a three-surface joining portion, which is a gasket having protrusions. However, in the technique disclosed in this document, it is difficult to hold the liquid seal in the vicinity because the liquid seal is not configured to be stored in the vicinity of the three-surface mating portion.
JP 2000-145972 A Japanese Patent No. 3572201 Japanese Patent No. 3575511 JP 2004-360492 A

  An object of the present invention is to provide a gasket having improved sealing performance.

  The present invention employs the following means in order to solve the above problems.

That is, the gasket of the present invention is
A gasket for sealing a gap between two opposing surfaces,
A gasket in which at least one of the two surfaces is formed by a plurality of members adjacent to each other, and a liquid seal is applied to a region including at least a part of a boundary portion of the adjacent members among the seal surfaces of the gasket. In
A liquid seal holding part composed of a plurality of convex parts and a plurality of concave parts is provided in a region where the liquid seal is applied.

  According to the present invention, the liquid seal is applied to the liquid seal holding portion constituted by a plurality of convex portions and a plurality of concave portions. Therefore, the liquid seal can be held particularly in the recessed portion. Accordingly, variation in the position where the liquid seal is applied can be suppressed, and the application amount (applied thickness) of the liquid seal can be secured at a certain level or more at a desired location. Accordingly, the surface to be sealed by the gasket is composed of a plurality of members, and even if there is a step at the boundary between adjacent members, or there is a variation in the size of the step, there is a gap caused by the step. With a liquid seal, it can seal more reliably.

  Here, the liquid seal holding portion may include a convex portion and a concave portion formed in a mesh shape.

  As a result, the liquid seal can be held in a desired range more reliably.

  Further, the liquid seal holding portion may include a plurality of convex portions and a convex portion surrounding the plurality of concave portions.

  Thereby, it can prevent more reliably that a liquid seal protrudes outside the liquid seal holding | maintenance part.

The gasket is attached to the groove on the side opposite to the seal surface on the side where the liquid seal holding portion is formed,
Any protrusion of the liquid seal holding part may have its tip formed in a region corresponding to the inner side of the lateral width of the groove.

  Thereby, it can suppress that a convex part is overcompressed.

The seal surface on the side where the liquid seal holding portion is formed is provided with a pair of seal protrusions extending along the longitudinal direction in a region other than the region where the liquid seal holding portion is formed,
The liquid seal holding part may include a convex part protruding from the seal protrusion.

  Thereby, even when the level | step difference produced in the boundary part of adjacent members is large, the clearance gap produced by the level | step difference can be more reliably sealed with a liquid seal.

  In addition, said each structure can be employ | adopted combining as much as possible.

  As described above, according to the present invention, the sealing performance is improved.

  The best mode for carrying out the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

  With reference to FIGS. 1-7, the gasket which concerns on the Example of this invention is demonstrated.

<Overall configuration of gasket>
In particular, the overall configuration of the gasket will be described with reference to FIGS. FIG. 1 is a part development view showing a state before a gasket according to an embodiment of the present invention is mounted. FIG. 2 is a cross-sectional view of a gasket according to an embodiment of the present invention. 2 corresponds to a P2 cross section in FIG. 1 and an AA cross section in FIG. 4 to be described later. FIG. 3 is a part of a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted. 3 correspond to the P1, P2, and P3 cross sections in FIG.

  As illustrated, the gasket 10 according to the present embodiment seals a gap between the head cover 100, the chain cover 200, and the cylinder head 300. In this embodiment, the chain cover 200 and the cylinder head 300 are configured separately.

  The gasket 10 includes a body part 11, a flat plate part 12 provided on one end side of the body part 11, and a pair of seal protrusions 13 provided on a surface of the flat plate part 12 opposite to the body part 11.

  The body part 11 is mounted in a groove 102 provided in the head cover 100. The body 11 attached to the groove 102 has its tip closely attached to the bottom surface 103 of the groove 102 and both sides thereof closely attached to both sides of the groove 102.

  The flat portion 12 protrudes on both sides of the body portion 11 between the end face 101 of the head cover 100 and the end face of the chain cover 200 or the end face 301 of the cylinder head 300 (only the latter is shown in FIG. 3). Arranged to be sandwiched.

  The pair of seal protrusions 13 are in close contact with the end surface of the chain cover 200 or the end surface 301 of the cylinder head 300. Note that the pair of seal protrusions 13 are provided substantially along the longitudinal direction of the gasket 10. However, the pair of seal projections 13 is not provided in a region where a liquid seal holding portion 20 described later is formed.

  Thus, the gasket 10 according to the present embodiment seals the gap between the two surfaces. As can be seen from the above description, the two surfaces are the surface on the head cover 100 side (the surface formed by the end surface 101 and the bottom surface 103 and both side surfaces of the groove 102), the end surface of the chain cover 200, and the cylinder head 300. It is a surface formed by the end surface 301.

  Here, of the two surfaces to be sealed by the gasket 10, the surface on the head cover 100 side is formed by a single member, so that the gasket 10 can be suitably sealed. On the other hand, since the other sealing surface is formed by the two members of the chain cover 200 and the cylinder head 300, a gap is formed at the boundary between them, and the gasket 10 alone cannot be suitably sealed. Therefore, a liquid seal is applied in the vicinity of the boundary. In the gasket 10 according to the present embodiment, a liquid seal holding portion 20 is provided in a region where the liquid seal is applied.

<Detailed description of liquid seal holder>
With reference to FIGS. 4-7, the liquid seal holding | maintenance part in the gasket which concerns on the Example of this invention is demonstrated in detail. FIG. 4 is a part of a bottom view of the gasket according to the embodiment of the present invention. FIG. 4 shows the vicinity of the bottom surface of the gasket where the liquid seal holding portion 20 is provided. FIG. 5 is a cross-sectional view of a gasket according to an embodiment of the present invention. 5 corresponds to the BB cross-sectional view in FIG. FIG. 6 is a part of a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted. 6 is a cross-sectional view of the cylinder head 300 side at the boundary between the chain cover 200 and the cylinder head 300. FIG. FIG. 7 is a part of a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted. 7 corresponds to the CC cross section in FIG.

  In the present embodiment, the liquid seal 30 is applied in the vicinity of the boundary between the chain cover 200 and the cylinder head 300 on the seal surface of the gasket 10. And the liquid seal holding | maintenance part 20 is provided in the area | region where a liquid seal is apply | coated among the sealing surfaces of the gasket 10. FIG. As described above, the pair of seal protrusions 13 is not provided only in the region where the liquid seal holding portion 20 is provided. In FIG. 4, the tip position of the seal protrusion 13 is indicated by a one-dot chain line.

  The liquid seal holding unit 20 includes a plurality of convex portions 21 and 22 and a plurality of concave portions 23. The convex portions 21 are provided in a lattice shape obliquely with respect to the longitudinal direction of the gasket 10, whereby the convex portions 21 and the concave portions 23 are formed in a mesh shape. And the convex part 22 is provided so that the circumference | surroundings of these convex parts 21 and the several recessed part 23 may be surrounded. In addition, in FIG. 4, the front-end | tip position of the convex parts 21 and 22 is shown with the dashed-dotted line.

  Then, the liquid seal 30 is applied to the area inside the convex portion 22. As a result, the liquid seal 30 is embedded in each of the plurality of recesses 23. The convex portion 22 is configured to have the same cross-sectional shape and size as the seal projection 13, and is in close contact with the end surface of the chain cover 200 or the end surface 301 of the cylinder head 300 in the same manner as the seal projection 13. While exhibiting a function, the liquid seal | sticker 30 exhibits the function which prevents the liquid seal | sticker 30 from protruding from the desired range (range enclosed by the convex part 22).

  The convex portion 21 is configured to protrude from the seal protrusion 13 and the convex portion 22 (the amount of protrusion from the flat plate portion 12 is large). As described above, by providing the convex portion 21 having a large protrusion amount, even if a large step is generated at the boundary portion between the chain cover 200 and the cylinder head 300, the tip of any one of the convex portions 21 is made to be more with respect to both. It is possible to ensure close contact (see FIG. 7). The convex portion 21 is preferably set to be approximately 0 to 0.3 mm larger than the seal protrusion 13.

  Further, the tip of each convex portion of the liquid seal holding portion 20 is formed in a region corresponding to the inner side of the lateral width of the groove 102. That is, the maximum width H (see FIG. 4) between the tips of the outermost convex portions is configured to be equal to or less than the lateral width W of the groove 102 (see FIG. 3). With this configuration, the convex portions 21 and 22 are compressed by the bottom surface of the groove 102 of the head cover 100 and the end surface of the chain cover 200 or the end surface 301 of the cylinder head 300. Therefore, since the convex portions 21 and 22 are not compressed by the end surface 101 of the head cover 100 and the end surface 301 of the chain cover 200 or the end surface 301 of the cylinder head 300, the convex portions 21 and 22 are prevented from being overcompressed. it can.

<Excellent point of gasket according to this example>
According to the gasket 10 according to the present embodiment, the liquid seal 30 is applied to the liquid seal holding portion 20 configured by the plurality of convex portions 21 and 22 and the plurality of concave portions 23. Therefore, the location where the liquid seal 30 is applied becomes clear, and in particular, the liquid seal 30 can be held so as to be embedded in the concave portion 23. Thereby, the dispersion | variation in the position where the liquid seal | sticker 30 is apply | coated can be suppressed, and the application amount (application | coating thickness) of the liquid seal | sticker 30 can be ensured more than fixed in a desired location. Therefore, the surface to be sealed by the gasket 10 is composed of two members, the chain cover 200 and the cylinder head 300, and even if there is a step at the boundary between these, The gap caused by the step can be more reliably sealed by the liquid seal 30.

  Moreover, since the convex part 21 and the recessed part 23 are formed in mesh shape, the effect like a dead end is exhibited. That is, even if the liquid seal 30 protrudes from a certain recess 23, the protruding portion enters the adjacent recess 23, so that the liquid seal 30 can be held in a desired range more reliably. And by providing the mesh-shaped convex part 21, it can apply | coat to the liquid seal holding | maintenance part 20 so that a liquid seal may be raised. In this way, when the liquid seal holding portion 20 is brought into contact with the boundary portion between the chain cover 200 and the cylinder head 300, the raised liquid seal is crushed. Therefore, even if there is a step at the boundary between the chain cover 200 and the cylinder head 300, the liquid seal is filled between the chain cover 200 and the cylinder head 300 and the liquid seal holding part 20 without any gap. Thereby, the outstanding sealing performance is implement | achieved. In addition, although it is not impossible to apply the liquid seal so that the liquid seal is raised by a single closed region (for example, when the liquid seal holding portion is formed only by the convex portion 22), in this case, the application work Is cumbersome and the amount of liquid seal needs to be increased.

  In addition, the liquid seal 30 can be more reliably prevented from protruding outside the liquid seal holding portion 20 by the convex portions 22 surrounding the plurality of convex portions 21 and the plurality of concave portions 23.

  Moreover, since the front-end | tip of all the convex parts 21 and 22 is formed in the area | region corresponded inside the horizontal width of the groove | channel 102, it can suppress that the convex parts 21 and 22 are overcompressed.

  Furthermore, since the convex portion 21 is configured to protrude from the seal protrusion 13 and the convex portion 22, even if a large step is generated at the boundary portion between the chain cover 200 and the cylinder head 300, the convex portion 21 is The tip of the convex portion 22 can be more closely attached. Further, since the liquid seal holding portion 20 is not provided with the seal protrusion 13, the sealing performance at this portion becomes a problem. By projecting the convex portion 21 slightly from the convex portion 22, the sealing performance is improved. Can be prevented. That is, if the convex portion 21 and the convex portion 22 are set at the same height, the contact area with the chain cover 200 and the cylinder head 300 becomes large at the time of mounting, and the surface pressure (peak surface) of the seal projection 13 portion is increased. The surface pressure of the convex portion 21 and the convex portion 22 is lower than the pressure. Therefore, the sealing performance of the part of the liquid seal holding part 20 is deteriorated. On the other hand, as in the present embodiment, by projecting the convex portion 21 slightly from the convex portion 22, the surface pressure can be increased at the portion of the convex portion 21, and the portion of the liquid seal holding portion 20 can be increased. The sealing performance can be made equal to the sealing performance of the seal projection 13 portion.

<Others>
In the above embodiment, the case where the convex portions 21 and the concave portions 23 are formed in a mesh shape by providing the plurality of convex portions 21 obliquely with respect to the longitudinal direction of the gasket 10 has been shown. The method of forming the portion and the plurality of recesses is not limited to this. In short, a plurality of convex portions and a plurality of concave portions may be interspersed so that the liquid seal can be held in a desired range. Another example of how to provide a plurality of convex portions and a plurality of concave portions will be described with reference to FIGS. FIGS. 8-10 is a part of bottom view of the gasket which shows the modification of a liquid seal holding | maintenance part.

The liquid seal holding portion 20a shown in FIG. 8 includes a plurality of convex portions 21a that are parallel or perpendicular to the longitudinal direction of the gasket 10 to form a convex portion 21a and a concave portion 23a in a mesh shape. And the convex part 22a is provided so that the circumference | surroundings of these convex parts 21a and the several recessed part 23a may be surrounded. And the convex part 22a is comprised so that the cross-sectional shape and magnitude | size may become the same as the seal | sticker protrusion 13. FIG. Moreover, the convex part 21a is comprised so that it may protrude rather than the seal | sticker protrusion 13 and the convex part 22a. Also in the case of the liquid seal holding part 20a configured as described above, the same effect as in the case of the liquid seal holding part 20 shown in the above embodiment can be obtained.

  The liquid seal holding portion 20b shown in FIG. 9 has a plurality of convex portions 21b parallel to the longitudinal direction of the gasket 10 so that convex portions 21b and concave portions 23b are formed in a lattice shape. And the convex part 22b is provided so that the circumference | surroundings of these convex parts 21b and the several recessed part 23b may be surrounded. And the convex part 22b is comprised so that the cross-sectional shape and magnitude | size may become the same as the seal | sticker protrusion 13. FIG. Moreover, the convex part 21b is comprised so that it may protrude rather than the seal | sticker protrusion 13 and the convex part 22b. In the case of the liquid seal holding portion 20b configured as described above, the same effect as that of the liquid seal holding portion 20 shown in the above embodiment can be obtained.

  The liquid seal holding portion 20c shown in FIG. 10 has a plurality of convex portions 21c perpendicular to the longitudinal direction of the gasket 10 to form convex portions 21c and concave portions 23c in a lattice shape. And the convex part 22c is provided so that the circumference | surroundings of these convex parts 21c and the several recessed part 23c may be surrounded. And the convex part 22c is comprised so that the cross-sectional shape and magnitude | size may become the same as the seal | sticker protrusion 13. FIG. Moreover, the convex part 21c is comprised so that it may protrude rather than the seal | sticker protrusion 13 and the convex part 22c. Also in the case of the liquid seal holding part 20c configured as described above, the same effect as in the case of the liquid seal holding part 20 shown in the above embodiment can be obtained.

  Moreover, in the said Example, although the gasket which seals the clearance gap between a head cover, a chain cover, and a cylinder head was demonstrated to the example, the part to which a gasket is applied is not restricted to this. The gasket of the present invention can be applied to various devices such as automobiles and their accessories, general industrial equipment, and home appliances. In this embodiment, as shown in FIG. 7, the space between the side wall surface of the chain cover 200 and the side wall surface of the cylinder head 300 is also sealed with a liquid seal (between these, A liquid seal is applied separately from the liquid seal holding portion 20), but the portion in between is not limited to the liquid seal and may be sealed with a general gasket.

FIG. 1 is a part development view showing a state before a gasket according to an embodiment of the present invention is mounted. FIG. 2 is a cross-sectional view of a gasket according to an embodiment of the present invention. FIG. 3 is a part of a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted. FIG. 4 is a part of a bottom view of the gasket according to the embodiment of the present invention. FIG. 5 is a cross-sectional view of a gasket according to an embodiment of the present invention. FIG. 6 is a part of a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted. FIG. 7 is a part of a schematic sectional view showing a state where the gasket according to the embodiment of the present invention is mounted. FIG. 8 is a part of a bottom view of a gasket showing a modification of the liquid seal holding portion. FIG. 9 is a part of a bottom view of the gasket showing a modification of the liquid seal holding portion. FIG. 10 is a part of a bottom view of the gasket showing a modification of the liquid seal holding portion. FIG. 11 is a schematic cross-sectional view showing a state before the gasket is mounted in a portion where the gasket is mounted. FIG. 12 is a schematic cross-sectional view showing a state in which a gasket according to a conventional example is mounted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Gasket 11 Body part 12 Flat plate part 13 Seal protrusion 20, 20a Liquid seal holding | maintenance part 21,21a, 21b, 21c Projection part 22,22a, 22b, 22c Projection part 23,23a, 23b, 23c Concave part 30 Liquid seal 100 Head cover 101 End face 102 Groove 103 Bottom face 200 Chain cover 300 Cylinder head 301 End face

Claims (5)

A gasket for sealing a gap between two opposing surfaces,
A gasket in which at least one of the two surfaces is formed by a plurality of members adjacent to each other, and a liquid seal is applied to a region including at least a part of a boundary portion of the adjacent members among the seal surfaces of the gasket. In
A gasket characterized in that a liquid seal holding portion composed of a plurality of convex portions and a plurality of concave portions is provided in a region where the liquid seal is applied.   The gasket according to claim 1, wherein the liquid seal holding portion includes a convex portion and a concave portion formed in a mesh shape.   The gasket according to claim 1, wherein the liquid seal holding portion includes a plurality of convex portions and a convex portion surrounding the periphery of the plurality of concave portions. The gasket is attached to the groove on the side opposite to the seal surface on the side where the liquid seal holding portion is formed,
Any one of the convex portions of the liquid seal holding portion has a tip formed in a region corresponding to the inner side of the lateral width of the groove. Gasket described in one. The seal surface on the side where the liquid seal holding portion is formed is provided with a pair of seal protrusions extending along the longitudinal direction in a region other than the region where the liquid seal holding portion is formed,
The gasket according to any one of claims 1 to 4, wherein the liquid seal holding portion includes a convex portion protruding from the seal protrusion.

Images