JPS593147A - Head gasket for combustion chamber of internal- combustion engine - Google Patents

Abstract

PURPOSE:To prevent incomplete combustion by increasing the compressibility by reducing the dead volume by forming a number of projection parts on a spacer laminated onto a gasket body and allowing said projection part to be compressed and deformed between the upper surface of a piston and the undersurface of a cylinder head. CONSTITUTION:A head gasket 5 is formed of a gasket body 50 and a spacer 52 having an extended part over the opened part 51 of the gasket body which projects into a combustion chamber. In this case, said spacer 52 has a hook- shaped projection part 55 at the part projecting into the upper part of the combustion chamber. The head gasket 5 is installed having the projection part 55 directed downward, and said projection part 55 is compressed between the top part of a piston 2 and the undersurface of a cylinder head 4 and the projection part 55 is deformed to remove the space in the upper part of the piston 2. Thus, the compressibility is improved by reducing the dead volume between the upper surface of the piston 2 and the undersurface of the cylinder head 4, and incomplete combustion can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an internal combustion engine that can reduce the incomplete combustion volume, that is, the dead volume, by reducing the trumpet clearance at the top dead center of the piston in an internal combustion engine such as a direct injection diesel engine as much as possible. This invention relates to improvements to the head gasket provided above the combustion chamber of an engine.

In conventional @-type diesel engines, etc., as shown in FIG. 5 is provided, but consideration has been given to variations in the thickness of the head gasket 5 when tightening, and cumulative errors such as dimensional tolerances of the piston 2, piston pin, connecting rod, crankshaft, etc.
@, Piston top clearance is 0.6m~1.0
It is normal to set it to about trrn1.

At tjly, a dead volume D (dead space) inevitably occurs between the top of the piston 2 and the bottom surface of the cylinder head 4, and because of this dead volume D, the pressure 1ii5i! This has the disadvantage of causing incomplete combustion, which hinders the improvement of combustion efficiency.

Therefore, it is clear that it is desirable to reduce this dead volume D as much as possible in order to improve the combustion efficiency of the internal combustion engine.

In particular, in a direct injection diesel engine with a small exhaust system, the above-mentioned cavities are significant and become a cause of exhaust smoke and a decrease in engine output.

Therefore, the present invention can reduce the dead volume D between the piston and the shilling head at the top dead center position of the piston of an internal combustion engine, thereby reducing the exhaust smoke of the engine and improving the engine output. The object of the present invention is to provide a helad gasket for forming a combustion chamber in an internal combustion engine.

The structure of the present invention to achieve the above object includes a head gasket cover provided at the upper part of a combustion chamber disposed between a sill head and a sill ring of an internal combustion engine, a gasket body made of a normal gasket material, and a gasket body made of a normal gasket material. This is more effective than a spacer made of an elastic, heat-resistant thin plate, especially a metal thin plate, laminated thereon, with a large number of claw-shaped protrusions provided on this spacer, and an opening near the claw-shaped protrusions. The invention is characterized in that the protrusion is configured to act as an elastic pawl that is pressed between the piston and the lower surface of the shilling head.

When the head gasket according to the present invention is used in an internal combustion engine, the spacer constituting the gasket 1 is provided with an elastic claw, so that the elastic claw is pressed against the lower surface of the piston and the shilling head, and the elastic This makes it possible to introduce carbon in the combustion gas through an opening formed near the claw and supply it to the back side of the spacer.

In this way, a spacer (filling) made of an elastic material, that is, a gold plate J plate, is placed in the upper part of the combustion chamber (bottom surface of the shilling head).
When using this spacer, the spacer is placed so that it is pressed against the piston, and the carbon in the combustion gas is absorbed by the spacer. As a result, this spacer is used as a support, and a piece of tape-like material with carbon adhered to its surface is interposed between the combustion chamber, the ceiling, and the top surface of the screw in. This makes it possible to reduce most of the unnecessary @products.

It goes without saying that this spacer is provided in areas other than the intake and exhaust valves and the fuel Roro 1 nozzle.

The present invention will be described in detail below with reference to the drawings.

FIG. 2 is a plan view of the head gasket according to the present invention, and the head gasket 5 includes a gasket body 50 and an opening 51 (inside the sill bore) of the portion of the gasket body 50 that protrudes into the combustion chamber. It is formed from a spacer 52 having a portion that extends. In addition,
53 is a hole for bolt tightening, and 54 is a hole for cooling water.

3 and 4 are diagrams showing the main parts of the Herad gasket 5. The gasket main body 50 is made of normal Herad gasket material such as asbestos.
A spacer 52 made of a metal plate is laminated on one side of the plate.

This spacer 52 has a thickness of, for example, 0.2 to 0.4 mm.
Stainless steel plates, heat-resistant steel plates, etc. are used.

(5) And a claw-shaped protrusion 55 on the part that protrudes to the top of the combustion chamber.
is provided. This claw-like protrusion 55 can be formed by simply pressing it with a metal mold with a sharp tip, or by making an H-shaped cut in the metal plate to form a claw and pushing the center of this part to one side.

Therefore, in the former case, a wall will be formed on the side surface of the protrusion 55, and in this case the protrusion 55 will be relatively hard. Further, in the latter 186, the claw-like protrusion 55 is cantilevered, so that the lever protrusion 55 itself is soft.

Regardless of the method of forming the claw-like protrusion 55, a slit or opening is provided in the vicinity or at the tip of the claw-like protrusion 55 according to the present invention, so that the protrusion has elasticity and the spacer 52 It is necessary that exhaust gas be introduced to the front and back surfaces of the

3 shows a spacer 52 formed by pressing the protrusion 55 on the lower surface thereof, and FIG. 4 shows a spacer 52 formed by making an H-shaped cut and pushing the protrusion 55 downward.

(6) The gasket main body 50 connects the silling body and the shilling head in an airtight manner, and can be made of a gasket 1 material that is normally used for sealing the main body of an internal combustion engine.

Further, as described above, a large number of protrusions 55 are formed in the portion of the spacer 52 exposed above the combustion chamber.
The method for forming the protrusion 55 is as described above. Also,
The density of the protrusions 55 may be such that carbon adheres to the front and back surfaces of the spacer 52 in the combustion chamber and does not easily fall off.

In FIG. 5, a reinforcing plate 56 with a U-shaped cross section is provided in the cutout portion of the gasket body 50 corresponding to the upper part of the silling bore, and a spacer 52 made of a metal plate is stacked on the upper part of the gasket body 50. This spacer 52 is provided with a protrusion 55 facing downward, and a slit 57 is provided at the tip of the protrusion 55.

FIG. 6 shows the spacer 52 in the embodiment shown in FIG.
are stacked on the bottom surface of the gasket body 50,
The protrusion 55 faces upward.

The height H of the protrusion 55 provided on the spacer 52 of the gasket 5 shown in FIGS. 5 and 6 is equal to the height H of the gasket body 50.
The height H of the protrusion 55 may be approximately the same as the thickness T of the gasket, or the height H of the protrusion 55 may be slightly lower than the thickness of the gasket body 5°.

The spacer has characteristics such as heat resistance, pressure resistance, and durability, and its thickness can be easily changed when pressure is applied between the screw 1 and the sill head. It needs to be made of a material, and specifically, as mentioned above, it may be a thin stainless steel plate or a heat-resistant alloy plate.

Next, the usage situation of the head gasket according to the present invention will be explained.

FIG. 7 shows a state in which the head gasket according to the present invention is attached to an internal combustion engine. This protrusion 55 protrudes downward from the AtA chamber, and is pressed between the top of the piston 2 and the lower surface of the cylinder head 4.
5 is slightly deformed to eliminate the space above the piston 2 as much as possible.

FIG. 8 shows a state in which carbon C contained in combustion gas adheres to the front and back surfaces of the spacer 52 when the internal combustion engine operates. In this way, when carbon adheres to the front and back surfaces of the spacer 52, the spacer 52 becomes a sheet of sea F stick, and the spacer 52 becomes like a piece of paper stuck to the ceiling of the combustion chamber.

As described above, the head gasket according to the present invention consists of a gasket body and a spacer made of an elastic material, preferably a thin metal plate, placed on the gasket body, and the spacer has a claw-like protrusion at a position corresponding to the shilling bore. established,
The height of this protrusion is configured so that it is pressed between the bottom surface of the combustion chamber's shilling head and the top of the piston, and this protrusion also holds the carbon attached to the spacer so that it does not fall off. This is possible.

Therefore, the head gasket according to the present invention can (9) be used in a diesel engine to reduce the dead volume, improve the pressure 1 retention rate, increase the combustion il'I rate, and reduce incomplete combustion. This has the effect of preventing combustion and reducing exhaust smoke.

[Brief explanation of the drawing]

Figure 1 shows a diagram of the combustion chamber formed in the combustion chamber of an internal combustion engine. 2 is a plan view of the head gasket according to the present invention, FIGS. 3 and 4 are enlarged perspective views of the main parts of the head gasket, and FIGS. 5 and 6 are
The figure is an enlarged side sectional view of the main part of the head gasket 1, and FIGS. 7 and 8 are explanatory diagrams of the operating force of an internal combustion engine using the head gasket according to the present invention. 1. Schilling, 2. Piston, 3. Schilling body, 4. Schilling t throat, 5.
- Gasket, 50...Gasket body, 51...Opening, 52...Spacer, 55...Protrusion, 57...Slit. (10 Figure 1 Figure 3 Figure 2 5 Figure 4 Figure 2 Figure 5 Figure 6,
4 Figure 8 52,

Claims (1)

[Claims] The head gasket is installed between the sill head of the inner ff1l section and the top of the sill, and consists of a gasket body and a spacer made of a heat-resistant elastic plate laminated to the gasket body. A protrusion is formed, and this claw-like protrusion is
It is characterized by being formed in such a size that it is pressed between the lower surface of the cylinder head and the upper part of the piston when the piston is moved to point E, and that an opening is formed in the vicinity of this claw-like protrusion. For use in the combustion chamber of internal combustion engines, gasket F0