WO2021005995A1

WO2021005995A1 - Gasket

Info

Publication number: WO2021005995A1
Application number: PCT/JP2020/023924
Authority: WO
Inventors: 勝磨今井; 浪益大澤
Original assignee: Nok株式会社
Priority date: 2019-07-09
Filing date: 2020-06-18
Publication date: 2021-01-14
Also published as: JPWO2021005995A1; CN217233660U; JP7285929B2

Abstract

This gasket (10) is provided with: a substrate (11) that is provided between joining sections (130) of a cylinder block (110) as a sealing target and a cylinder head (120) and is formed of a metal plate; openings (12) formed in the substrate (11); a plurality of insertion through-holes (13) which are provided in a region between outer circumferential edge sections (111) and the openings (12) in the substrate (11) and through which bolts (140) that are fastening members for attaching the substrate (11) between the joining sections (130) are inserted; and deformation suppression bead parts (14) that are provided to the outer circumferential section of the insertion through-holes (13) and formed in a shape protruding from the substrate (11) in the thickness direction.

Description

gasket

The present invention relates to a gasket.

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

Japanese Unexamined Patent Publication No. 2006-233773

By the way, when the cylinder head is attached to the cylinder head using a tightening member such as a bolt, the cylinder head is deformed by the tightening force of the tightening member. In a multi-cylinder engine in which cylinders are arranged in series, the amount of deformation of the cylinder head due to the tightening force is such that the amount of deformation on the center side in the arrangement direction of the cylinders in the cylinder block is larger than the amount of deformation on both ends. In this case, the cylinder head was bent. In an engine, deformation such as bending of the cylinder head due to a tightening force has been a cause of problems such as a decrease in the sealing property of the joint and an increase in friction.

Here, as a technique for suppressing the deformation of the cylinder head due to the tightening force, it has been known that a shim member is interposed together with a gasket between the joint portion between the cylinder block and the cylinder head. However, in such a technique, a shim member is required in addition to the gasket in order to suppress the deformation of the cylinder head, which causes an increase in cost and requires a technique for arranging the shim member at the time of engine production. It was.

Further, in Patent Document 1, as a technique for suppressing deformation of the cylinder head due to a tightening force, bead portions are provided on the outside of the cylinder on both end sides. However, the technique of Patent Document 1 is particularly difficult to use for an open deck type engine because there are restrictions on the position where the bead portion is provided.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a gasket having a simple structure and suppressing deformation of a sealed object.

In order to achieve the above object, the gasket according to the present invention is provided between the joints to be sealed, and has a substrate formed of a metal plate, an opening formed in the substrate, and the substrate. A plurality of insertion holes are provided in the region between the outer peripheral edge portion and the opening, and a tightening member for attaching the substrate is inserted between the joint portions, and an insertion hole is provided in the outer peripheral portion of the insertion hole. It is provided with a deformation suppressing bead portion which is formed so as to be convex in the thickness direction of the substrate.

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

In the gasket according to one aspect of the present invention, the deformation suppressing bead portion is provided at a position where the center of the arc is different from the center of the insertion hole in the surface direction of the substrate.

In the gasket according to one aspect of the present invention, the deformation suppressing bead portions are provided on the outer peripheral portions of the insertion holes provided on both ends in the longitudinal direction and the lateral direction of the substrate.

In the gasket according to one aspect of the present invention, the elastic force generated by adjusting the arc length of the deformation suppressing bead portion can be adjusted.

According to the gasket according to the present invention, deformation of the sealed object can be suppressed with a simple structure.

It is a top view for showing the schematic structure of the gasket which concerns on embodiment of this invention. It is a side view which shows the engine which the gasket shown in FIG. 1 is attached. It is an enlarged plan view for showing the insertion hole of the gasket shown in FIG. 1 and the deformation suppressing bead portion. It is BB sectional view of the insertion hole and the deformation suppressing bead part shown in FIG. It is an enlarged plan view for showing the deformation example of the insertion hole of the gasket and the deformation suppressing bead part shown in FIG. FIG. 5 is a cross-sectional view taken along the line CC of the insertion hole and the deformation suppressing bead portion shown in FIG. It is a top view for showing the schematic structure of the gasket which concerns on a reference example. It is a side view which shows the engine which the gasket shown in FIG. 7 is attached.

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

FIG. 1 is a plan view for showing a schematic configuration of a gasket 10 according to an embodiment of the present invention. FIG. 2 is a side view showing the engine 100 to which the gasket 10 is mounted.

Hereinafter, for convenience of explanation, the stacking direction of the cylinder block 110 and the cylinder head 120 of the engine 100 shown in FIG. 2 is defined as the z-axis direction. The z-axis direction is also the thickness direction of the gasket 10. Further, the longitudinal direction of the cylinder block 110 and the cylinder head 120, which is the direction perpendicular to the z-axis direction and is the arrangement direction of the cylinders of the engine 100, is the x-axis direction. Further, the direction is perpendicular to the z-axis direction and the x-axis direction, and the lateral 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 surface directions of the gasket 10. In the following description, as shown in FIG. 2, the side facing the cylinder head 120 is the upper side of the gasket 10, and the side opposite to the upper side surface facing the cylinder block 110 is the lower side of the gasket 10. Further, in the following description, as shown in FIG. 1, the side away from the center of the gasket 10 in the x-axis direction or the y-axis direction is the outside, and the side toward the center of the gasket 10 is the inside. In the following description, when the positional relationship and direction of each member are described as the upper side or the lower side, the positional relationship and direction in the drawing are shown to the last, and the positional relationship and direction when incorporated in an actual vehicle or the like are shown. is not.

As shown in FIG. 2, the gasket 10 seals 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 engine 100 to be sealed. It has a role. The target to which the gasket 10 is applied is not limited to the above. The target to which the gasket 10 is applied may be, for example, a joint between an exhaust manifold and an exhaust pipe, an electrical unit (motor, inverter, converter, PCU, etc.) and the like.

As shown in FIGS. 1 and 2, the gasket 10 is provided between the joint portion 130 between the cylinder block 110 and the cylinder head 120 as an example of the sealing target, and the substrate 11 formed of a metal plate and the substrate. It includes an opening 12 formed in 11. Further, a plurality of gaskets 10 are provided in the region between the outer peripheral edge portion 111 and the opening 12 of the substrate 11, and a bolt 140 as a tightening member for attaching the substrate 11 between the joint portions 130 is inserted. The insertion hole 13 is provided. Further, the gasket 10 includes a deformation suppressing bead portion 14 which is provided on the outer peripheral portion of the insertion hole 13 and is formed in a convex shape in the thickness direction from the substrate 11. Hereinafter, the configuration of the gasket 10 will be specifically described.

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

The opening 12 is formed in the substrate 11 in a round hole shape, for example, according to the number, position, and shape of the cylinders of the engine 100. For example, four openings 12 are arranged in the x-axis direction on the substrate 11. In the gasket 10, the number, position, and shape of the openings 12 are not limited.

A plurality of, for example, 10 insertion holes 13 are provided in a region on the outer peripheral side of the opening 12 in the substrate 11 and between the outer peripheral edge portion 111. Specifically, the insertion holes 13 are formed from the end insertion holes 131 provided at the four corners of the substrate 11 in the longitudinal direction (x-axis direction) and the lateral direction (y-axis direction) in the above-mentioned region of the substrate 11. It is provided along the outer peripheral edge portions 111a on both sides in the longitudinal direction of the substrate 11. The insertion holes 13 are provided at a predetermined distance from each other. The insertion hole 13 is provided in the engine 100 for inserting a bolt 140 for fastening the cylinder block 110 and the cylinder head 120, as shown in FIG.

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

FIG. 3 is an enlarged plan view for showing the insertion hole 13 of the gasket 10 and the deformation suppressing bead portion 14. Further, FIG. 4 is a cross-sectional view taken along the line BB of the insertion hole 13 and the deformation suppressing bead portion 14.

As shown in FIGS. 1 and 3, the deformation suppressing bead portion 14 is provided outside the plurality of insertion holes 13 provided in the substrate 11. The deformation suppressing bead 14 is provided on the outer peripheral portion of the plurality of insertion holes 13. Specifically, the deformation suppressing bead portion 14 is provided on the outer peripheral portion of the end insertion holes 131 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 lateral direction. The center of the deformation suppressing bead portion 14 is concentric with the axis A indicating the center of the insertion hole 13 in the substrate 11, for example. The deformation suppressing bead 14 is formed at a position concentric with the axis A in an arc shape or a substantially arc shape having a different diameter.

As shown in FIG. 4, the deformation suppressing bead portion 14 is formed to be convex toward the thickness direction of the gasket 10, for example, the upper side in the z-axis direction. The deformation suppressing bead portion 14 can be formed by pressing a desired position of the gasket 10 on the substrate 11. The diameter of the deformation suppressing bead portion 14, the thickness t, and the width w in the plane direction are not particularly limited.

FIG. 5 is an enlarged plan view for showing a deformation example of the insertion hole 13 of the gasket 10 and the deformation suppressing bead portion 14A. Further, FIG. 6 is a cross-sectional view taken along the line CC of the insertion hole 13 and the deformation suppressing bead portion 14A.

As shown in the deformation examples shown in FIGS. 5 and 6, in the gasket 10, the deformation suppressing bead portion 14A is not limited to the above-mentioned deformation suppressing bead portion 14 formed in an arc shape. In the gasket 10, the deformation suppressing bead portion 14A may be formed, for example, in an arc shape in which the center of the substrate 11 is centered on the axis A of the insertion hole 13 and the axis A1 concentric with the axis A1.

Next, the operation of the gasket 10 provided with the deformation suppressing bead portion 14 will be described.

FIG. 7 is a plan view for showing a schematic configuration of the gasket 20 according to the reference example. Further, FIG. 8 is a side view showing the engine 200 to which the gasket 20 is mounted. In the gasket 20 of the reference example shown in FIGS. 7 and 8, the deformation suppressing bead portion 14 is not provided on the outer peripheral portion of the end insertion hole 231 provided at both ends in the longitudinal direction and the lateral direction of the substrate 21. Only the point is different from the gasket 10. Further, the engine 200 of the reference example is different from the engine 100 only in that the gasket 20 is interposed at the joint portion 130 between the cylinder block 110 and the cylinder head 120.

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

On the other hand, as described above, the deformation suppressing bead portion 14 is formed on the substrate 11 which is a metal plate as an elastic body so as to protrude in the thickness direction by press working. Therefore, the deformation suppressing bead portion 14 interposed the gasket 10 in the joint portion 130 between the cylinder block 110 and the cylinder head 120 of the engine 100 to be sealed. When the cylinder block 110 and the cylinder head 120 are tightened by the bolt 140, the deformation suppressing bead 14 exerts the elastic force shown by the arrow D in FIG. 2 in the protruding direction (upper side in the z-axis direction). Then, in the gasket 10, the deformation suppressing bead portion 14 exerts an elastic force D, so that the amount of deformation of the cylinder head 120 can be suppressed and the bending of the cylinder head 120 can be suppressed.

As described above, the deformation suppressing bead portions 14 are provided on the outer peripheral portions of the end insertion holes 131 provided on both ends in the longitudinal direction and the lateral direction of the substrate 11. Here, like the deformation suppressing bead portion 14A, the axis A1 indicating the center of the arc may be provided at different positions in the plane direction of the axis A indicating the center of the insertion hole 13 and the substrate 11.

As described above, the deformation suppressing

bead portions

14, 14A exert an elastic force D on the upper side of the substrate 11, which is an elastic body, by projecting in the thickness direction. That is, the deformation suppressing

bead portions

14, 14A can set the length of the portion that exerts the elastic force D, that is, the magnitude of the elastic force D, according to the length of the arc. Therefore, the deformation suppressing

bead portions

14, 14A can exert a desired elastic force for suppressing the deformation of the cylinder head 120 by adjusting the arc length (arc length) arc length. It is adjustable.

Therefore, according to the gasket 10, the cylinder head 120 is provided by providing the deformation suppressing bead portions 14 on the outer peripheral portions of the end insertion holes 131 provided at both ends in the longitudinal direction and the lateral direction of the substrate 11. It exerts an elastic force toward the upper side. According to the gasket 10, the deformation suppressing bead 14 exerts an elastic force toward the upper side, so that the deformation of the cylinder head to be sealed can be suppressed with a simple structure.

Although the preferred embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and includes all aspects included in the concept and claims of the present invention. In addition, each configuration may be selectively combined as appropriate so as to achieve at least a part of the above-mentioned problems and effects. Further, for example, the shape, material, arrangement, size, etc. of each component in the above embodiment can be appropriately changed depending on the specific usage mode of the present invention.

10,20 ... Gasket, 11,21 ... Substrate, 12 ... Opening, 13 ... Insertion hole, 14,14A ... Deformation suppression bead part, 100 ... Engine, 110 ... Cylinder block, 111 ... Outer peripheral edge, 111a ... Outer peripheral edge Part, 120 ... Cylinder head, 130 ... Joint, 131 ... End insertion hole, 140 ... Bolt

Claims

A gasket provided between the joints to be sealed.
A substrate formed of a metal plate and
The opening formed in the substrate and
Insertion holes provided in a plurality of regions between the outer peripheral edge portion and the opening portion of the substrate through which a tightening member for mounting the substrate is inserted between the joint portions.
A deformation suppressing bead portion formed on the outer peripheral portion of the insertion hole so as to be convex in the thickness direction from the substrate.
Gasket with.
The deformation suppressing bead portion is formed in an arc shape at the outer peripheral portion of the insertion hole.
The gasket according to claim 1.
The deformation suppressing bead portion is provided at a position where the center of the arc is different from the center of the insertion hole in the surface direction of the substrate.
The gasket according to claim 2.
The deformation suppressing bead portions are provided on the outer peripheral portions of the insertion holes provided on both ends in the longitudinal direction and the lateral direction of the substrate.
The gasket according to any one of claims 1 to 3.
The elastic force generated by adjusting the arc length of the deformation suppressing bead portion can be adjusted.
The gasket according to any one of claims 1 to 4.