JP2559886Y2 - Gasket protection device for internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gasket protection device for an internal combustion engine, and more particularly, to a gasket protection device capable of preventing gasket settling caused by variation in axial force of a head bolt for tightening the gasket. It concerns the device.

[0002]

BACKGROUND ART cylinder head gasket of a conventional internal combustion engine (hereinafter simply referred gasket) 1, as shown in FIG. 7, interposed between the cylinder head 2 and the cylinder block 4, fastened by the head bolts 6 ing.
The head bolts 6, usually because it is formed by an iron-based material, particularly when the cylinder head 2 is formed of aluminum alloy, the cylinder head 2 and the header
The difference in thermal expansion coefficient and thermal conductivity of the de bolt 6, a difference in thermal expansion occurs between the cylinder head 2 and the head bolt 6 from the start of the internal combustion engine, the heating process of the internal combustion engine, f
Clamping force greatly increases the head bolts 6, a large fastening axial force than a predetermined force to the gasket 1 is applied. In the cooling process due to the stop of the internal combustion engine, the tightening force of the head bolt 6 on the gasket 1 is reduced, contrary to the above.

[0003] Therefore, especially in cold regions, etc.
The fluctuation of the tightening axial force of the head bolt 6 accompanying the operation / stop of the internal combustion engine is large.
Is causing a large drop.

[0004] When the fuel in the cylinder 8 in the compression stroke of the internal combustion engine to burn explosively, the explosive force, as indicated by a white arrow in the figure, because they act as push up the cylinder head 2, head bolt The tension indicated by the solid line arrow acts on 6, and the tightening axial force exerted on the gasket 1 temporarily decreases. Then, when the engine moves to the exhaust stroke,
By the reaction, the head bolt 6 shrinks as shown by the dotted arrow,
The axial force of the head bolt 6 is a value equal to or higher than a normal tightening force. This change in the axial force on the gasket 1 is repeated during operation of the engine, the gasket 1, in particular a major cause When f the bead 10.

[0005]

By the way, the set of the gasket is largely affected by the material of the gasket constituting material. For example, a metal gasket using spring steel is much more set than a weak asbestos gasket. Decrease. However, a similar problem occurs in a metal gasket as the engine becomes more sophisticated, and it is recognized that further improvement is required.

The present invention has been made in view of the above-described problems.
A gasket for an internal combustion engine that minimizes the effect of fluctuations in the axial force of the head bolt accompanying the combustion cycle of the engine on the tightening of the gasket, and can suppress the sag of the gasket regardless of the type of gasket. The purpose is to provide a protection device.

Furthermore, the present invention, the protective device, such as aluminum alloy, applying a bonding member formed in a relatively soft material, for an internal combustion engine scratches were prevented with Kukoto the bonding surface It is intended to provide a gasket protection device.

[0008]

First <br/> configuration of the protection device for an internal combustion engine gaskets of the present invention for achieving the above object, according to an aspect of the periphery of the head bolt that is implanted in the cylinder body
A spring seat recess is formed in the
Attach the spring and insert the coil spring
Laminated Cylinder Head Gasket with Opening Hole
With the cylinder head and the cylinder
At least one of the coil springs in the dam body
Attach a washer to the area where
Cylinder head while compressing
To the cylinder body to extend the coil spring
Force is constantly applied to the head bolt via the cylinder head
I is intended was Unishi.

[0009] The internal combustion engine of the present invention for achieving the above object.
The second configuration of the gasket protection device is a ring-shaped gasket protection device.
A ring-shaped scan pulling formed from spring material, the cylinder
Insert the head bolts planted in the body and
Metal laminate having an open hole for inserting the ring-shaped scan pulling
Type cylinder head gasket attached to cylinder body
And at least one of the cylinder head and cylinder body
Seat displacement or the other of the ring-shaped scan pulling within portion abutting
Attach the gold, the head bolt a ring-shaped scan pulling
Cylinder head to cylinder body while compressing more
Attach and apply the extension force of the ring-shaped spring to the cylinder.
The head bolt is always applied via the head bolt .

[0010] The ring-shaped spring may be formed separately from the metal-laminated cylinder head gasket, or may be integrated. That is, the bolt holes of the gasket component plate excluding the face plate are formed in a size that can fit the ring-shaped spring, and the ring-shaped spring is covered with the face plate from both sides so that the ring-shaped spring does not fall off the gasket. Can be That is,
A third configuration of the protection device of the gasket for an internal combustion engine of the present invention for achieving the objects were planted in the cylinder body to the construction plate metal laminate type cylinder head gasket Bol
A bolt hole for inserting the gasket component plate, and removing the bolt hole except a surface plate of the gasket component plate from a ring-shaped spring material.
The formed ring-shaped spring is formed in a size that can be fitted therein, and the ring-shaped spring is fitted in the bolt hole.
Then , cover with a surface plate from both sides of the ring-shaped spring,
A ring-shaped spring and a gasket are integrally assembled, and a washer is attached to at least one of a cylinder head and a cylinder body that matches the attachment position of the spring, and an extension force generated when the spring is compressed and contracted. Is applied to a head bolt via a cylinder head.

A fourth aspect of the gasket protection device for an internal combustion engine according to the present invention for achieving the above object is as follows. A gasket constituting plate made of a spring material has a bolt hole and a bead having a corrugated cross section surrounding the periphery of the bolt hole. Form a spring, this bead spring is located on the protruding side
Size for inserting the spring into the gasket component plate
Forming a metal laminated cylinder head gasket with bolt holes opened , mounting this cylinder head gasket to the cylinder body, and attaching a washer to a portion where at least one of the cylinder head and the cylinder body comes into contact with a bead spring, The cylinder head is attached to the cylinder body while compressing and contracting the bead-shaped spring with the head bolt, so that the extension force of the bead-shaped spring is always applied to the head bolt via the cylinder head.

By setting the free length of the spring to be the same as or close to the thickness of the gasket , thermal distortion during operation / stop of the internal combustion engine can be improved.
It is also possible to prevent an excessive elastic force from being exerted on the cylinder block and the cylinder head at times other than the generation of the dust and the explosion stroke.

[0013]

SUMMARY OF The spring exerts an elastic force against the clamping force of the head bolt to the bonding surface, to absorb the axial force of the head bolt, suppressing an increase compression of the gasket, the head <br/> bolt axial force It acts to suppress expansion and contraction due to excessive compression of the gasket due to fluctuation. In addition, the washer acts to distribute the concentrated load exerted on the joint surface by the restraining force given by the spring to the joint member. Accordingly, the present invention can be relatively soft yet junction member such as aluminum alloy, effectively apply. The washer, for example,
Attach it by embedding it in the joint member so that it does not interfere with the gasket.

Further , according to the first aspect of the present invention,
Spring around the head bolts set in the Dabody
By forming a seat recess, the thickness of the gasket can be reduced.
Install a coil spring with a simple compression length.
And enable. A spring according to any one of claims 2 to 4.
Exerts high spring force with a slight stroke when compressed
This prevents unnecessary compression of the gasket and
No need to apply excessive tension to the head bolt.
You. Moreover, the configurations according to claims 3 and 4 respectively
Because the spring is integrated with the gasket, handling is easy
It will be easier.

Therefore, even when the cylinder head is formed of an aluminum alloy, the thermal conductivity is different from that of the head bolt, and the joint surface is formed of a relatively soft material, the cylinder head increased when the engine is started. clamping force of the gasket, and e given on the bonding surface of the spring force dispersed to absorb the increase in the clamping force of the compression stroke of the internal combustion engine, it is possible to protect both the gasket and the joint surface.

[0016] As specifically described in the following examples, f
Tsu the spring attached to the de volts, more than a certain length, for example, head bolt extends above the gasket thickness, the aspect which does not adversely extension force of the spring, the total elongation range of the head board <br/> belt The present invention can be implemented in any of the modes in which the extension force of the spring is applied.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. The protection device for a gasket for an internal combustion engine according to the first embodiment shown in FIG. 1 implements the present invention by a coil spring, and is provided on a cylinder body 4 at a position corresponding to a bolt hole 12 of a gasket 1 made of a metal laminated gasket. A recess 14 is provided, and a washer 15 is
Was attached. Then, the spring 16, inserted into the head bolt <br/> DOO 6, is seated on the washer 15, to the cylinder head 2 and the cylinder body 4 through the seat gold 15, it is made to act directly stretching force. Reference numeral 12 'in the figure is a screw hole for screwing the head bolt 6 into the cylinder body 4.

The entire recess absorbs the length of the spring 16 and applies a predetermined spring force. The washer 15 is for distributing the male force of the spring 16 and transmitting it to the cylinder head 2 and the cylinder body 4. Therefore, even in the cylinder head 2 and the cylinder body 4 made of aluminum alloy, the joining surface 1
There is no possibility that indentations will occur in 89. Therefore, for example, when there is no risk of indentation, as in the case where the cylinder body 4 made of cast iron is used, the use of the washer 15 can be omitted .

The spring 16 always holds the head bolt 6
The extension force opposing the axial force is directly exerted on the joint surfaces 18 of the cylinder head 2 and the cylinder body 4 by the elastic force opposing the axial force. Therefore, when the internal combustion engine is started, the tightening axial force of the head bolt 6 increases as described above due to the difference in thermal expansion between the cylinder head 2 and the head bolt 6, and the force for tightening the gasket 1 increases. However, the increased tightening force absorbs an increase in the tightening axial force of the head bolt 6 by the elastic force of the spring 16, and thus alleviates the fluctuation of the tightening axial force of the head bolt 6 exerted on the gasket 1.

Further, when the axial force of the head bolt 6 suddenly increases due to the reaction of the explosive force at the time of combustion of the internal combustion engine, the spring 16 opposes and absorbs the increase in axial force, and the gasket 1 To prevent the compression force from acting. Further, the spring 16 of the first embodiment exerts an extension force even when the engine enters the exhaust stroke and the axial force suddenly decreases. As described above, the spring 16 reduces the fluctuation of the tightening force of the head bolt 6 and prevents the gasket 1 from sagging.

Incidentally, the cylinder head 2 of the internal combustion engine
As shown in FIG. 2, there is a tendency for the center to be deformed so that the center warps upward in the figure due to the drag of the bead 10 (FIG. 7) provided on the gasket 1. Thus, for example, FIG.
The gasket 1 is provided at the longitudinal end 19 as shown in FIG.
When the protection device for a gasket for an internal combustion engine of the first embodiment is applied to the head bolt 6 ', the cylinder head 2 is always
While pushing time, since such a force on the intermediate portion does not act, it is possible to prevent the center of warp which occurs during the initial tightening is more intense.

The protective device of the gasket Example 1, since the operation as described above, to suppress the fatigue due to excessive load variation of the bead of metallic gaskets, to long-term use,
Outside that can be held a sealing force, it is possible to suppress warpage of the cylinder head 2. FIG. 3 shows the gasket 1 in addition to the cylinder hole 8 and the head bolt hole 12.
Are not shown .

FIG. 4 shows a state where the ring- shaped spring 16 composed of the gasket 1 and the leaf spring used in the second embodiment is placed on the joint surface 18, and the illustration of the head bolt and the cylinder head is omitted. The spring 16 used in the second embodiment is a leaf spring in which two ring-shaped plates made of spring steel are curved so as to protrude outward and are overlapped. It can exert a high spring force with a small stroke when compressed. FIG. 4 (similarly in FIG. 5)
Illustration of the cylinder head is omitted.

The spring 16 shown in FIG. 4 exerts a high spring force with a slight stroke when compressed, and the stroke range of the spring 16 can be limited to a narrow range. For example, if you set the free length of the spring 16 the same as the thickness of the gasket 1, the fuel is burned, when the head volume <br/> belt (not shown in FIG. 4) is extended, the spring 1
When the length of the cylinder 6 reaches the thickness of the gasket 1, the force by which the spring 16 pushes up the cylinder head 2 disappears. Therefore, it is possible to prevent unnecessary tension from being applied to the head bolt, and to prevent the gasket 1 from being over-compressed when the head bolt is contracted by the reaction.

The gasket protection device according to the third embodiment shown in FIG. 5 is a gasket comprising a metal-laminated gasket comprising a spring 16 formed by bending a ring-shaped plate made of spring steel into a bead by projecting to one side. It is attached between the first surface plates 20. In this case, the gasket 1
And the spring 16 can be integrated.

FIG. 6 shows a gasket protection device according to a fourth embodiment in which a metal plate 22 made of spring steel is laminated on the gasket 1 and a bead having a corrugated cross section is formed around the bolt hole 12 provided in the metal plate 22. Is formed. In this way, the spring 16 can be formed on a part of the component plate of the gasket. A bead (both not shown) surrounding the seal hole may be formed in the metal plate 22. The spring 16 of the fourth embodiment can also effectively prevent the metal gasket 1 from sagging similarly to the springs 16 of the first and second embodiments. In the second to fourth embodiments, the washer 15 operates in the same manner as the washer of the first embodiment.

[0027]

As described above, in the gasket protection device for an internal combustion engine according to the present invention, since the springs at both ends are interposed with the joint surfaces through washers, the tightening axial force of the head bolt for tightening the gasket is reduced. If the gasket increases and an excessive tightening force is exerted on the gasket, the spring elastically deforms to absorb the increased tightening force, thereby suppressing the influence on the gasket. In addition, since the washer is attached to a portion where the spring comes into contact with the joining member, even if the joining member is made of a relatively soft material, the joining surface is not damaged. Therefore, it is possible to prevent the settling caused by fatigue caused by an excessive change in the tightening load of the material constituting the gasket without damaging the joint surface.

[0028] The structure according to claim 1 is characterized in that
Spring around the head bolts set in the Dabody
Longer than the thickness of the gasket because the seat recess is formed
A coil spring with a compressed length can be installed.
Wear. The spring of claim 2-3, the leaf spring and the gasket and the separate, selected without being constrained spring characteristics to the specifications of the gasket are possible, compress
With a small stroke, a high spring force is demonstrated and the gasket
To prevent excessive compression of the
Can be eliminated. And claim 3
The configurations described in and 4 each use a gasket for the spring.
It is easy to handle because it is integrated with the socket.

Therefore, for example, in a gasket using an aluminum alloy cylinder head, an excessive increase in gasket tightening force due to a difference in thermal conductivity between the cylinder head and the cylinder body , which occurs at the time of starting the internal combustion engine, is absorbed. Excessive fluctuations in the clamping force caused by the combustion cycle can be absorbed. Further, it is possible to help prevent deformation of the center of the cylinder head. As described above, the protection device for a gasket for an internal combustion engine according to the present invention can maintain the sealing performance for a long time while protecting the joint surface.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a protection device for a gasket for an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a modification of a cylinder head to which the protection device for a gasket for an internal combustion engine according to the first embodiment is applied.

FIG. 3 is a view for explaining a mounting position of a protection device for a gasket for an internal combustion engine shown in FIG. 1;

FIG. 4 is a perspective view of a protection device for an internal combustion engine gasket according to a second embodiment of the present invention, in which a part of the protection device is partially omitted and partially cut away.

FIG. 5 is a cross-sectional view illustrating a protection device for a gasket for an internal combustion engine according to a third embodiment of the present invention with a part of the protection device omitted;

FIG. 6 is a sectional view of a main part of a gasket for an internal combustion engine used in Embodiment 4 of the present invention.

FIG. 7 is a cross-sectional view illustrating a problem of a gasket of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Gasket 2 Cylinder head 4 Cylinder body 6 Head bolt 12 Bolt hole 14 Depression 15 Washer 16 Spring 18 Joint surface

Claims (4)

(57) [Scope of request for utility model registration] 1. A head bolt erected on a cylinder body.
A spring seat recess is formed around the
Attach the coil spring and
Metal cylinder head gas with a hole through which the gas is inserted
Attach the cylinder to the cylinder body,
At least one of the coil springs on the cylinder body
Attach a washer to the area where the ring contacts
Cylinder while compressing the spring with the head bolt
Attach the head to the cylinder body and use the coil spring
Extension force to the head bolt via the cylinder head at all times
An apparatus for protecting a gasket for an internal combustion engine. 2. A ring formed from a ring-shaped spring material.
Heddoboru the of the scan pulling, was planted in the cylinder body
With inserted Doo, inserting the ring-shaped scan pulling
Laminated Cylinder Head Gasket with Opening Hole
With the cylinder head and the cylinder
At least one of the ring-shaped scan Puri Dabodi
Ring mounting washer is in contact with portions, ring-shaped scan flops
While compressing the ring with the head bolt,
Attach the head to the cylinder body, a ring-shaped scan pudding
The extension force of the ring is constantly applied to the head bolt via the cylinder head.
A protective device for a gasket for an internal combustion engine when applied . 3. A metal laminate type cylinder head gasket
Bolts for inserting bolts set in the cylinder body into the component plate
Forming a through hole, excluding the surface plate of the gasket component plate
The bolt hole, formed to a size capable of fitting the ring-shaped spring formed from ring-shaped spring member, the bolt
The ring-shaped spring is fitted in the hole , covered with a surface plate from both sides of the ring-shaped spring, the ring-shaped spring and the gasket are integrally assembled, and a cylinder head that matches the mounting position of the spring is provided. A protection device for a gasket for an internal combustion engine, wherein a washer is attached to at least one of the parts of a cylinder body, and an extension force generated when the spring is compressed is applied to a head bolt via a cylinder head. 4. A bolt holes in gasket construction plate made of spring material to form a bead-shaped spring section waveform surrounding the periphery of the bolt hole, the bead-shaped spring
The gasket component plate arranged on the projecting side
A metal-laminated cylinder head gasket with a bolt hole large enough to insert a ring is formed, this cylinder head gasket is mounted on a cylinder body, and a bead-shaped spring of at least one of the cylinder head and the cylinder body comes in contact with the cylinder head gasket. A gasket for an internal combustion engine that has a washer attached to the part and a cylinder head attached to the cylinder body while compressing and compressing the bead-shaped spring with the head bolt so that the extension force of the bead-shaped spring is always applied to the head bolt via the cylinder head Protective equipment.