CN217233660U

CN217233660U - Sealing gasket

Info

Publication number: CN217233660U
Application number: CN202090000589.4U
Authority: CN
Inventors: 今井胜磨; 大泽浪益
Original assignee: Nok Corp
Current assignee: Nok Corp
Priority date: 2019-07-09
Filing date: 2020-06-18
Publication date: 2022-08-19
Anticipated expiration: 2030-06-18
Also published as: JP7285929B2; JPWO2021005995A1; WO2021005995A1

Abstract

A gasket (10) is provided between a joint (130) between a cylinder block (110) and a cylinder head (120) to be sealed, and is provided with: a substrate (11) formed of a metal plate; an opening (12) formed in the substrate (11); a plurality of insertion holes (13) through which bolts (140) serving as fastening members for attaching the substrate (11) to the joint section (130) are inserted, the plurality of insertion holes being provided in a region between the outer peripheral edge section (111) of the substrate (11) and the opening section (12); and a deformation inhibiting rib (14) which is provided at the outer peripheral portion of the insertion hole (13) and is formed in a convex shape from the substrate (11) in the thickness direction.

Description

Sealing gasket

Technical Field

The utility model relates to a sealed pad.

Background

Conventionally, in an engine of an internal combustion engine, a gasket interposed between a joint portion of a cylinder block and a cylinder head, which is an example of a sealing target, is known (for example, see patent document 1).

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open No. 2006-233773.

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, when the cylinder head is mounted to the cylinder head using a fastening member such as a bolt, the cylinder head is deformed by a fastening force of the fastening member. In a multi-cylinder engine in which cylinders are arranged in series, the amount of deformation of a cylinder head due to a fastening force is greater on the center side in the cylinder arrangement direction in a cylinder block than on both end portions. In this case, a deflection occurs in the cylinder head. In the engine, the occurrence of deformation such as deflection in the cylinder head due to the fastening force is a factor of the above-described problems such as the reduction in the sealing performance of the joint portion and the increase in friction.

Here, as a technique for suppressing deformation of the cylinder head due to the fastening force, a technique is known in which a gasket member is interposed between a joint portion of the cylinder block and the cylinder head together with a gasket. However, in such a technique, in order to suppress deformation of the cylinder head, a gasket member is required in addition to the gasket, which leads to an increase in cost, and a technique is also required for disposing the gasket member during engine production.

In addition, in patent document 1, as a technique for suppressing deformation of the cylinder head due to the fastening force, beads are provided on the outer sides of the cylinders on both end portions. However, in the technique of patent document 1, there is a restriction on the position where the bead portion is provided, and therefore it is particularly difficult to use the technique for an open roof type engine.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a gasket that suppresses deformation of a sealing object with a simple structure.

Means for solving the problems

In order to achieve the above object, the present invention provides a gasket disposed between joint portions of a sealing object, including: a substrate formed of a metal plate; an opening portion formed on the substrate; a plurality of insertion holes provided in a region between the outer peripheral edge portion of the substrate and the opening portion, and through which a fastening member for attaching the substrate between the joining portions is inserted; and a deformation inhibiting rib portion provided at an outer peripheral portion of the insertion hole and formed to be convex in a thickness direction of the substrate.

In the gasket according to one aspect of the present invention, the deformation inhibiting rib is formed in an arc shape at an outer peripheral portion of the insertion hole.

In the gasket according to one aspect of the present invention, the center of the arc of the deformation inhibiting rib is provided at a position different from the center of the insertion hole in the surface direction of the base plate.

In the gasket according to one aspect of the present invention, the deformation inhibiting rib is provided in a peripheral portion of the insertion hole, and the insertion hole is provided in both end sides of the long side direction and the short side direction of the base plate.

In the gasket according to one aspect of the present invention, the deformation inhibiting ribs can adjust the generated elastic force by adjusting the arc length.

Effect of the utility model

According to the utility model discloses a sealed pad can restrain the deformation of sealed object with simple structure.

Drawings

Fig. 1 is a plan view showing a general structure of a gasket according to an embodiment of the present invention.

Fig. 2 is a side view showing an engine mounted with the gasket shown in fig. 1.

Fig. 3 is an enlarged plan view showing an insertion hole and a deformation inhibiting rib portion of the gasket shown in fig. 1.

Fig. 4 is a B-B sectional view of the insertion hole and the deformation inhibiting rib shown in fig. 3.

Fig. 5 is an enlarged plan view showing a modification of the insertion hole and the deformation inhibiting bead portion of the gasket shown in fig. 1.

Fig. 6 is a C-C sectional view of the insertion hole and the deformation inhibiting rib shown in fig. 5.

Fig. 7 is a plan view showing a general structure of a gasket according to a reference example.

Fig. 8 is a side view showing an engine mounted with the gasket shown in fig. 7.

Detailed Description

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

Fig. 1 is a plan view showing a general structure of a gasket 10 according to an embodiment of the present invention. Fig. 2 is a side view showing engine 100 to which gasket 10 is attached.

For convenience of description, the z-axis direction is defined as the stacking direction of the cylinder block 110 and the cylinder head 120 of the engine 100 shown in fig. 2. The z-axis direction is also the thickness direction of the gasket 10. A direction perpendicular to the z-axis direction, that is, a longitudinal direction of the cylinder block 110 and the cylinder head 120 which is a cylinder arrangement direction of the engine 100 is defined as an x-axis direction. The direction is perpendicular to the z-axis direction and the x-axis direction, and the short side direction of the cylinder block 110 and the cylinder head 120 is the y-axis direction. The x-axis direction and the y-axis direction are also the plane directions of the gasket 10. In the following description, as shown in fig. 2, a side facing the cylinder head 120 is an upper side of the gasket 10, and a side facing the cylinder block 110, which is an opposite side of the upper side surface, is a lower side of the gasket 10. In the following description, as shown in fig. 1, a side away from the center of the gasket 10 in the x-axis direction or the y-axis direction is referred to as an outer side, and a side toward the center of the gasket 10 is referred to as an inner side. In the following description, the positional relationship and the direction of each member are described as upper or lower, but the positional relationship and the direction in the drawings are merely shown, and do not indicate the positional relationship and the direction when the member is assembled in an actual vehicle or the like.

As shown in fig. 2, the gasket 10 functions to seal a gap between various two members, such as a joint 130, which is a space between a cylinder block 110 and a cylinder head 120 of an internal combustion engine 100 to be sealed. The object to which the gasket 10 is applied is not limited to the above. The gasket 10 may be applied to, for example, a joint portion between an exhaust manifold and an exhaust pipe, an electric device unit (a motor, an inverter, a converter, a PCU (power control unit), or the like).

As shown in fig. 1 and 2, the gasket 10 is provided between the joint 130 between the cylinder block 110 and the cylinder head 120, which is an example of a sealing object, and includes a base plate 11 formed of a metal plate and an opening 12 formed in the base plate 11. The gasket 10 includes a plurality of insertion holes 13, through which bolts 140 serving as fastening members for attaching the substrate 11 to the joint portions 130 are inserted, provided in a region between the outer peripheral edge portion 111 of the substrate 11 and the opening portion 12. The gasket 10 includes deformation inhibiting ribs 14 provided on the outer peripheral portion of the insertion hole 13 and formed to protrude in the thickness direction from the substrate 11. The structure of the gasket 10 will be specifically described below.

As shown in fig. 1, in the gasket 10, the outer peripheral edge 111 of the substrate 11 is formed in a rectangular shape or a substantially rectangular shape. The substrate 11 has an opening 12, an insertion hole 13, and a deformation inhibiting rib 14.

The opening 12 is formed in a circular hole shape, for example, on the base plate 11 in accordance with the number, position, and shape of cylinders of the engine 100. In the substrate 11, for example, 4 openings 12 are formed in the x-axis direction. In the gasket 10, the number, position, and shape of the openings 12 are not limited.

The plurality of, for example, 10 insertion holes 13 are provided in the region between the outer peripheral edge 111 and the outer peripheral side of the opening 12 of the substrate 11. Specifically, the insertion holes 13 are provided along the outer peripheral edge 111a on both sides of the substrate 11 in the longitudinal direction from the end insertion holes 131 provided at the four corners of the substrate 11 in the longitudinal direction (x-axis direction) and the short-side direction (y-axis direction) in the above-described region of the substrate 11. The insertion holes 13 are provided at predetermined distances from each other. As shown in fig. 2, in engine 100, insertion holes 13 are provided for inserting bolts 140 that fasten cylinder block 110 and cylinder head 120.

In the gasket 10, the opening 12 and the insertion hole 13 are formed by punching a substrate 11 formed of a metal plate.

Fig. 3 is an enlarged plan view illustrating the insertion hole 13 and the deformation inhibiting bead portion 14 of the gasket 10. In addition, fig. 4 is a B-B sectional view of the insertion hole 13 and the deformation inhibiting rib 14.

As shown in fig. 1 and 3, the deformation inhibiting ribs 14 are provided outside the plurality of insertion holes 13, and the plurality of insertion holes 13 are provided in the substrate 11. The deformation inhibiting rib portions 14 are provided at outer peripheral portions of the plurality of insertion holes 13. Specifically, the deformation inhibiting beads 14 are provided in the outer peripheral portions of the end insertion holes 131 located at the four corners of the substrate 11 among the plurality of insertion holes 13. The end insertion holes 131 are provided at both ends of the substrate 11 in the longitudinal direction and the short direction. The center of the deformation inhibiting rib 14 is concentric with an axis a indicating the center of the insertion hole 13, for example, in the substrate 11. The deformation inhibiting rib 14 is formed in an arc shape or a substantially arc shape having a different diameter at a position concentric with the axis a.

As shown in fig. 4, the deformation inhibiting ribs 14 are formed in a convex shape toward the upper side in the thickness direction of the gasket 10, for example, the z-axis direction. The deformation inhibiting rib portion 14 can be formed by press working a desired position in the base plate 11 of the gasket 10. The diameter, thickness, and width w in the plane direction of the deformation inhibiting ribs 14 are not particularly limited.

Fig. 5 is an enlarged plan view showing a modification of the insertion hole 13 and the deformation inhibiting bead portion 14A of the gasket 10. Fig. 6 is a C-C sectional view of the insertion hole 13 and the deformation inhibiting rib 14A.

As in the modification shown in fig. 5 and 6, in the gasket 10, the deformation inhibiting beads 14A are not limited to the above-described deformation inhibiting beads 14 formed in an arc shape. In the gasket 10, the deformation inhibiting bead 14A may be formed in an arc shape, for example, with the center thereof centered on an axis a1 eccentric from the axis a of the insertion hole 13 in the base plate 11.

Next, the operation of the gasket 10 provided with the deformation inhibiting ribs 14 will be described.

Fig. 7 is a plan view showing the general structure of the gasket 20 according to the reference example. Fig. 8 is a side view showing the engine 200 to which the gasket 20 is attached. The gasket 20 of the reference example shown in fig. 7 and 8 differs from the gasket 10 only in the following points: the deformation inhibiting ribs 14 are not provided in the outer peripheral portions of the end insertion holes 231 provided in both the longitudinal and transverse ends of the substrate 21. Further, engine 200 of the reference example differs from engine 100 only in the following points: interposed at the joint 130 between the cylinder block 110 and the cylinder head 120 is the gasket 20.

As shown in fig. 8, in the multi-cylinder engine 200 in which cylinders are arranged in series, the amount of deformation of the cylinder head 120 due to the fastening force is larger on the center side in the arrangement direction of the cylinders in the cylinder block 110 than on both ends. In the engine 200, deflection occurs in the cylinder head 120. Therefore, a gap h is formed between the cylinder block 110 and the cylinder head 120 in the longitudinal center portion of the engine 200.

On the other hand, as described above, in the substrate 11 which is a metal plate as an elastic body, the deformation inhibiting beads 14 are formed so as to protrude in the thickness direction by press working. Therefore, the deformation inhibiting bead 14 interposes the gasket 10 at the joint 130 between the cylinder block 110 and the cylinder head 120 of the engine 100, which is the object of sealing. When the cylinder block 110 and the cylinder head 120 are fastened by the bolts 140, the deformation inhibiting beads 14 exert an elastic force in the protruding direction (upward in the z-axis direction) as indicated by the arrow D in fig. 2. Further, the gasket 10 can suppress the amount of deformation of the cylinder head 120 and suppress the deflection of the cylinder head 120 by the elastic force D exerted by the deformation suppressing beads 14.

As described above, the deformation inhibiting ribs 14 are provided on the outer peripheral portion of the end insertion holes 131, and the end insertion holes 131 are provided on both ends of the substrate 11 in the longitudinal direction and the short direction. Here, as in the deformation inhibiting bead 14A, the axis a1 indicating the center of the arc may be provided at a position different from the axis a indicating the center of the insertion hole 13 in the plane direction of the substrate 11.

As described above, in the substrate 11 as an elastic body, the

deformation inhibiting ribs

14 and 14A protrude in the thickness direction to generate the elastic force D upward. That is, the length of the portion where the elastic force D is exerted, that is, the magnitude of the elastic force D can be set according to the length of the arc of the deformation inhibiting

bead portions

14 and 14A. Therefore, the

deformation inhibiting beads

14, 14A can be adjusted so as to exert a desired elastic force for inhibiting the deformation of the cylinder head 120 by adjusting the arc length (arc length).

Therefore, according to the gasket 10, the deformation inhibiting beads 14 are provided in the outer peripheral portions of the end portion insertion holes 131 provided in both the longitudinal direction and the short direction end portions of the base plate 11, and thereby the elastic force is exerted toward the upper side where the cylinder head 120 is provided. According to the gasket 10, the deformation inhibiting beads 14 exert an elastic force toward the upper side, and thus deformation of the cylinder head to be sealed can be inhibited with a simple structure.

While the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and includes all the embodiments encompassed by the concept of the present invention and the claims. In addition, in order to achieve at least part of the above-described problems and effects, the respective structures may be selectively combined as appropriate. For example, the shape, material, arrangement, size, and the like of each component in the above embodiments may be appropriately changed according to a specific use mode of the present invention.

Description of the symbols

10, 20 … gasket

11, 21 … substrate

12 … opening part

13 … through hole

14, 14A … deformation inhibiting rib

100 … engine

110 … cylinder block

111 … outer peripheral edge portion

111a … outer peripheral edge part

120 … cylinder head

130 … joint

131 … end through hole

140 … bolt

Claims

1. A gasket, provided between joining portions of sealing objects, comprising:

a substrate formed of a metal plate;

an opening portion formed on the substrate;

a plurality of insertion holes provided in a region between the outer peripheral edge portion of the substrate and the opening portion, and through which a fastening member for attaching the substrate between the joint portions is inserted; and

a deformation inhibiting rib portion formed in a convex shape in a thickness direction from the substrate at an outer peripheral portion of the insertion hole,

the center of the arc of the deformation inhibiting rib is provided at a position different from the center of the insertion hole in the plane direction of the substrate, and an end portion of the deformation inhibiting rib formed at the outer peripheral portion of the insertion hole coincides with the insertion hole.

2. The gasket of claim 1, wherein,

the deformation inhibiting rib portion is provided in an outer peripheral portion of the insertion hole provided in both end sides in a long side direction and a short side direction of the substrate.

3. The gasket of claim 1 or 2,

the deformation inhibiting rib can adjust the generated elastic force by adjusting the arc length.