JPS5924848Y2 - Cylinder block cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder block cooling device, and more particularly to a Ginonda block cooling device that can effectively cool the boundary walls of adjacent cylinder bores of a multi-cylinder cylinder block.

Generally, a water jacket is formed around the cylinder bore of a water-cooled engine, and the cylinder wall is cooled by passing cooling water.

If the thickness of the boundary wall between adjacent cylinder bores is sufficiently large, it is also possible to form a cavity in the boundary wall between the cylinder bores and allow cooling water to flow therethrough.

However, if the thickness of the boundary wall between the cylinder bores is small, a water jacket cannot be formed within the boundary wall, and as a result, this area is not sufficiently cooled and the temperature of the cylinder gasket tends to increase. However, there was a problem that the gasket was easily damaged.

Conventionally, a system has been developed in which a hollow member that communicates with the water jacket is buried in the boundary wall between cylinder bores (see Japanese Patent Publication No. 147122/1983), but when the thickness of the boundary wall between cylinder bores is small, It is difficult to bury a hollow member there, and even if the hollow member is buried forcibly, the substance of the boundary wall becomes extremely thin, causing problems in terms of strength.

Therefore, the purpose of the present invention is to provide a cylinder in which the boundary walls between adjacent cylinder bores can be sufficiently cooled without weakening the strength of the boundary walls, even if the thickness of the boundary walls between the cylinder bores is small. The purpose of the present invention is to provide a block cooling device.

According to the present invention, the above object is achieved by embedding cooling pipes in the boundary walls of adjacent cylinder bores in a cylinder block having water jackets formed on both outer sides of a plurality of cylinder bores arranged in one example. However, this cooling pipe is distantly related by being flattened at the center and provided with water pockets at both ends communicating with the water jacket.

An embodiment of a cylinder block cooling device according to the present invention will be described below with reference to the drawings.

Fig. 1 shows an example in which the present invention is applied to a cylinder block of a four-cylinder engine.
, 2D are formed in a line at equal intervals.

The upper surface of this cylinder block 1 is a cylinder rad gasket surface 3, and it goes without saying that a cylinder head cover is attached via a gasket (not shown).

Moreover, a cavity 4 is formed along the longitudinal direction on the outside of the cylinder bores 2A, 2B, 2C, and 2D, and water is poured into the cavity 4 to form a water jacket.

Therefore, according to the present invention, the four cylinder bores 2
Cooling pipes 6 are buried in the boundary walls 5A, 5B, and 5C of a pair of adjacent cylinder bores A, 2B, 2C, and 2D.

The buried position of this cooling pipe 6 is preferably a position close to the cylinder radial gasket surface 3.

Although FIG. 1 shows a partially cutaway state where the cooling pipe 6 is buried at the boundary wall 5B, it is similarly buried at the boundary walls 5A and 5C on both sides thereof. Of course.

This cooling pipe 6, as shown in FIGS. 2 to 4,
The central part 6a of a flat hollow tube with both ends open is crushed, and the openings at both ends are formed with blind hole-shaped water pockets 6b and 6C. )6b,
Cooling water in a water jacket is introduced into 6C.

Next, such a cooling pipe 6 is connected to each boundary wall 5A, 5B of the cylinder bore 2A, 2B, 2C, 2D of the cylinder block.
The method of embedding it in 5C will be described.

As is well known, in order to form a water jacket around the cylinder bore of a cylinder block, a water jacket core 7 as shown in FIG. 5 is used. Three cooling pipes 6, 6.6 may be installed in advance at positions corresponding to the boundary wall as shown in the figure.

For this purpose, the cooling pipe 6 is molded in advance from a suitable metal material, the cooling pipe 6 is set in a jacket core molding die, and shell sand is blow-molded.

Next, the jacket core 7 is set in a cylinder block mold, the molten metal is poured in, and only the water jacket core 7 is then removed.

Then, as clearly shown in FIG.
The central portion 6a is located on a line connecting the centers of the cylinder bores 2B and 20, and the water pockets 6b and 6C are opened into the water jacket, respectively, allowing the introduction of cooling water to cool the boundary walls of the cylinder bores.

As is clear from the above explanation, according to the present invention, the central part is crushed within the boundary wall of the adjacent cylinder bore, and the cooling pipe is provided with water pockets communicating with the water jacket at both ends. The boundary wall of the cylinder bore can be cooled without introducing cooling water by providing a cavity in the cylinder.

In particular, since the central part of the cooling pipe is crushed and made thin, it can be applied even if the thickness of the boundary wall of the cylinder bore is small, and it is possible to prevent the radial gasket into the cylinder from being overheated. .

In order to demonstrate the effects of the present invention, using a 4-cylinder 1600 engine, the temperature of the gasket surface of the cylinder block was measured under the same conditions for the conventional cylinder block and the cylinder block according to the present invention.

The results are as shown in FIG. 7, and it was confirmed that the present invention had a large cooling effect between the bores of the cylinder block.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a cylinder block equipped with a cylinder block cooling device according to the present invention, Fig. 2 is a plan view showing cooling pipes, Fig. 3 is a front view thereof, and Fig. 4 is a side view thereof.
Fig. 5 is a perspective view showing the water jacket core, Fig. 6 is a sectional view showing the cooling pipe installed in the cylinder block, and Fig. 7 shows the relationship between engine speed and gasket surface cylinder temperature. FIG. 2 is a diagram showing a comparison between a conventional cylinder block and a cylinder block according to the present invention. 1...Cylinder block, 2A, 2B, 2C,
2D...Cylinder bore, 3...Cylinder rad gasket surface, 4...Cavity, 5A,
5B, 5C... Boundary wall, 6... Cooling pipe, 7... Water jacket core.

Claims (1)

[Scope of utility model registration request] 1. In a cylinder block in which water jackets are formed on both outer sides of a plurality of cylinder bores arranged in a row, a cooling pipe is buried in the boundary wall of the adjacent cylinder bores, and the cooling pipe has a center portion between the cylinder bores. A cylinder block cooling device characterized in that water pockets are formed at both ends by being crushed in the axial direction and communicating with the water jacket. 2. The cylinder block cooling device according to claim 1, wherein the cooling pipe is embedded in the boundary wall of the cylinder bore near the cylinder Rad gasket surface.