JP2597687Y2 - Metal cylinder head gasket - 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 used for an internal combustion engine, and more particularly, to a multi-layer metal cylinder head gasket applied to an engine having an open deck cylinder block structure.

[0002]

2. Description of the Related Art Various demands have been made on automobile engines year by year, and from the viewpoint of cooling effect and the like, a water jacket portion formed so as to surround a cooling water flow path around a cylinder is provided. Engines with an open deck cylinder block structure are the mainstream.

In a cylinder head gasket in an engine having an open deck cylinder block structure, a portion located at a water jacket portion is always immersed in cooling water. For this reason, the sealing material adhered to the gasket surface peels off, mixes into the flow path, and tends to hinder the flow of the cooling water.

In order to prevent the peeling of the sealing material, a gasket has been proposed in which the sealing material at the water jacket portion of the gasket is peeled off by a water jet. Further, there has been proposed a gasket formed of a multi-layer structure and having a metal plate having a sealing material removed along a water jacket portion.

However, in the former method, a new process of peeling by a water jet is added to the conventional gasket manufacturing process which has been substantially completed by punching and bonding a metal plate. . For this reason, the introduction of water jet equipment, an increase in the number of manufacturing steps, and maintenance of processing accuracy caused a rise in the unit price of gasket production.

On the other hand, in the latter case, since the water jacket is formed so as to surround the cylinder,
The metal plate having the sealing material is divided into the cylinder bore side and the outer peripheral side. Therefore, it is not only necessary to separately provide a means for maintaining the positional relationship between the metal plates to be laminated, but also the rigidity of the completed gasket in the plane direction is insufficient, and the gasket causes leakage due to deformation during use. It was easy.

[0007]

SUMMARY OF THE INVENTION The present invention minimizes the possibility of peeling of the sealing material caused by being exposed to the water jacket portion, and minimizes the flow of the coolant even if the sealing material peels. An object is to provide a cylinder head metal gasket that can minimize adverse effects.

Another object of the present invention is to provide a cylinder head metal gasket which can omit conventional useless coupling means and can secure the rigidity of the gasket in the plane direction to prevent deformation during use. .

[0009]

The cylinder head metal gasket according to the present invention is a multi-layer metal cylinder head gasket applied to an engine having an open deck cylinder block structure. The cylinder head metal gasket according to the present invention includes at least one sheet metal having a sealing material on an outer surface and another sheet metal overlapped with the sheet metal.
A portion of the thin metal sheet having the sealing material located in the water jacket portion of the engine is perforated except for the bridge portion.

[0010] have a width of 20mm from the bridge about 3, and from the cylinder bore center, and a direction connecting the centers of adjacent cylinder bores from each other, the direction or the connecting direction orthogonal to the connecting direction And a direction away from each other by about 45 degrees.

[0011]

When the metal sheet having the sealing material is incorporated into the engine, only the bridge portion is located in the water jacket portion of the engine, and the peeling of the sealing material is minimized. Also, the portion between the cylinder bore side and the outer peripheral side is connected by a bridge portion without separately providing a connecting means, and the rigidity in the plane direction of the gasket is ensured by the bridge portion disposed at an appropriate distance. . When the seal material is peeled off, the size of the peeled seal material is so small as to be negligible due to the size of the bridge portion, and does not block the water jacket portion.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cylinder head metal gasket according to an embodiment of the present invention, as shown in FIGS.
It is formed so as to be applied to an engine having an open deck cylinder block structure, and includes at least one (two in the illustrated case) metal sheet 1 and this metal sheet 1
And another metal sheet 2 superimposed on each other.

The metal sheet 1 has a sealing material 3 on the outer surface which is on the side in contact with the flange surface to which it is applied. The metal sheet 1 is formed in a plane shape having a cylinder bore C, a bolt hole B, and the like, substantially in the same manner as the flange surface to be applied. However, the metal thin plate 1 is formed with a plurality of holes 4 having a shape conforming to the shape of the water jacket J at a portion located in the water jacket J of the engine, and a bridge is formed between the plurality of holes 4. A part 5 is provided. Thus, the peripheral portion 6 of the cylinder bore C of the thin metal plate 1 and the outer peripheral portion 7 thereof are connected by the bridge portion 5 provided in a positional relationship over the water jacket J.

The sheet metal 2, like the sheet metal 1, has a plane shape substantially similar to the flange surface to which it is applied.
A water hole 8 is provided in a portion of the thin metal plate 2 located at the water jacket portion J, whereby the flow rate and the flow direction of the cooling water flowing through the water jacket portion J are adjusted to efficiently cool the engine.

The seal member 3 is made of a heat-resistant material which can eliminate a seal leak in a gasket surface direction by using a thin metal plate as a material. For example, a conventional rubber coating can be applied.

The bridge portion 5 is separated from the center of the cylinder bore C by a direction X connecting the centers of adjacent cylinder bores to each other and a direction Y perpendicular to the connection direction X or approximately 45 degrees from the connection direction X. They are provided so as to be located in the directions Y and Z, respectively. It is not necessary to strictly set the separation angle, and it should be noted that the bridge portion 5 is provided so as to be evenly distributed as a whole depending on the position of the water hole 8 and the like. The rigidity in the plane direction of the gasket is ensured by being arranged in the relation.

The width W of the bridge portion 5 is so small as to be negligible so as not to block the water jacket portion J when the sealing material peels off.
The gasket is formed to have a size of about 3 to 20 mm so as to secure rigidity in the plane direction.

[0018]

According to the present invention, the metal sheet 1 is formed so as to be connected by the bridge portion 5 between the peripheral portion 6 of the cylinder bore C and the outer peripheral portion 7 thereof.
The exposed portion of the water jacket J can be minimized, and even if the seal material is peeled, the peeled pieces are small, and the risk of obstructing the flow of the cooling water can be minimized. This can prevent secondary problems.

Further, by providing the bridge portion 5 at an appropriate separation angle and setting the width W to an appropriate dimension, the rigidity of the gasket in the plane direction can be ensured, and the gasket due to vibration, heat, and the like during the actual operation of the engine. Can be prevented from being deformed and generation of leakage can be avoided.

[Brief description of the drawings]

FIG. 1 is a partial view showing a planar shape of a metal cylinder head gasket according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

[Explanation of symbols]

 1, 2 metal sheet 3 sealing material 4 hole 5 bridge 8 water hole J water jacket

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16J 15/08 F02F 11/00

Claims (1)

(57) [Scope of request for utility model registration] 1. A metal cylinder head gasket having a multi-layer structure applied to an engine having an open deck cylinder block structure, wherein at least one metal sheet having a sealing material on an outer surface is overlapped with the metal sheet. A portion of the metal sheet having a sealing material, which is located in the water jacket portion of the engine, is perforated leaving a bridge portion ,
The bridge part has a width of about 3 to 20 mm and the cylinder
-Center the adjacent cylinder bores from the bore center
The direction of connection, the direction orthogonal to the connection direction or
In the direction about 45 degrees apart from the connection direction
Metal cylinder head gasket characterized by being provided so that