JPS6023493Y2 - Joint structure between cylinder block and cylinder head - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a joint structure between a cylinder block and a cylinder head that prevents local blow-through of the cylinder Rad gasket.

Generally, the cylinder head gasket is subjected to high pressure, so it is the member that is easiest to blow out, and there are also places where it is impossible to narrow the distance between fastening bolts or to widen the seal width due to the structural limitations of the cylinder head.

For this reason, in the past, grooves were formed on the sealing surface, or gaskets with high rigidity and high cost were used. Due to the structural limitations of the cylinder head, the spacing between fastening bolts was narrowed, and a wide seal could not be achieved. The current situation is to prevent local blow-through of the Rad gasket to the cylinder at weak points.

The present invention was developed in view of the above points, and the joint surface of at least one of the cylinder tab jig and the cylinder head is formed into an inclined surface in which the gap for gasket insertion gradually narrows from the high pressure side to the low pressure side. By this, local blow-out can be prevented even by using an inexpensive soft gasket without forming a groove on the sealing surface or using an expensive and highly rigid gasket. The purpose is to provide a joint structure.

Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

The cylinder head 1 is joined to a joint surface of a cylinder block 3 via a cylinder head gasket 2 formed in substantially the same shape.

This cylinder head 1 has a wider spacing between fastening bolts than other parts due to structural constraints as shown in FIGS. The joint surface with the cylinder head 2, which is a part that is easy to move, is formed into a tapered shape in which the wall thickness becomes thinner from the high pressure side P to the low pressure side Q.

A tapered (wedge-shaped) gap is formed between the joint surface of the cylinder head 1 and the joint surface of the cylinder block 3, in other words, at the position where the radial gasket 2 is placed in the cylinder.

On the other hand, the cylinder head gasket 2 has a wall thickness that extends from the high pressure side P to the low pressure side Q so that the cylinder head joint surface of the portion disposed in the tapered position of the cylinder head 1 matches the tapered part of the cylinder head. It is formed into a tapered shape that becomes thinner.

In this embodiment, as shown in FIG.
In the atrium, the gap on the low pressure side Q is narrower than the gap on the high pressure side P, and the wall thickness on the high pressure side P of the cylinder rad gasket 2 disposed in this gap is thicker than the wall thickness on the low pressure side Q. In other words, due to the wedge effect, the Rad gasket 2 is prevented from blowing locally into the cylinder.

Note that the reference numeral 4 in the figure indicates a screw hole for a fastening bolt.

4 and 5 show a second embodiment of the present invention.

In this embodiment, a cylinder head gasket 2 with parallel surfaces is disposed on the joint surface of the cylinder head 1 and the cylinder block 3, which are locally tapered.

Therefore, as shown in FIG. 5, the degree of compression on the low-pressure side Q of the cylinder head gasket 2 is higher than that on the high-pressure side P, and local blow-through from the high-pressure side P to the low-pressure side Q is prevented.

Note that the shape, material, and structure of the cylinder head gasket 2 used to implement the present invention are not limited.

Further, the tapered portion formed on the cylinder head gasket 2 may be formed not only on one side as in the embodiment but also on both sides.

As described above, in the present invention, at least one of the joining surfaces of the cylinder block and the cylinder head is formed into an inclined surface in which the gap for inserting the gasket gradually narrows from the high pressure side to the low pressure side, so that a groove is formed on the sealing surface. The present invention has the effect of preventing local blow-through in the cylinder head of a compressor or engine by using an inexpensive soft gasket without forming or using an expensive and highly rigid gasket.

[Brief explanation of drawings]

FIG. 1 is a bottom view showing the cylinder head of the embodiment of the present invention;
Figures 2 and 3 show the first embodiment of the present invention, of which Figure 2 is a sectional view of the main part showing the joint surface between the cylinder head and cylinder block and the cylinder gasket, and Figure 3 is the same as in Figure 2. 4 and 5 show a second embodiment of the present invention, and FIG. 4 shows the joint surface between the cylinder head and the cylinder block and the cylinder. FIG. 5 is a cross-sectional view of a main part showing the Rad gasket in a state in which the Rad gasket is disposed in the cylinder in FIG. 4. In the figure, reference numeral 1 indicates the cylinder head, 2 indicates the cylinder head gasket, 3 indicates the cylinder block, P indicates the high pressure side, and Q indicates the low pressure side.

Claims (1)

[Scope of utility model registration request] In a cylinder head mounting structure in which a cylinder block and a cylinder head are joined via a gasket, a part or the entire joint surface of at least one of the cylinder block and cylinder head is connected so that the gap for gasket insertion is moved from the high pressure side to the low pressure side. A joint structure between a cylinder block and a cylinder head, characterized by forming an inclined surface that gradually becomes narrower in the direction of the cylinder block.