JPS5822968Y2 - Internal combustion engine cooling structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a structure for effectively cooling the cylinders of an internal combustion engine by substantially equalizing the distribution of cooling water around the cylinders.

In recent years, in many water-cooled internal combustion engines, in order to make the cylinder block compact, a water duct (cooling water passage) is not specially provided on the side of the cylinder block, but the water jacket around the cylinder is used instead. It's starting to look like this.

That is, in this type of cylinder block 1 as shown in FIGS. 1 and 2, for example, cooling water cooled by a radiator or the like and pumped by a water pump flows through the shafts of each cylinder 2 on the front wall 3 of the block. On the line that connects our hearts llll3
The water flows into the water from the inlet 6 located at the center of the cylinder 6, collides with the first cylinder 21 near the population 6, and then splits into the a direction and the b direction and flows through the water jackets 5a and 5b to cool each cylinder 2.

However, in such a case, the cylinder 21 close to the inlet 6 is extremely cooled because the cooling water cooled by the radiator etc. collides with it first, resulting in an undesirable temperature difference between the cylinder 21 and the other cylinders 2. It has become.

In view of the above points, the present invention aims to provide a cooling structure that prevents overcooling of a specific cylinder.

Hereinafter, the present invention will be explained with reference to an embodiment shown in FIGS. 1, 3, and 4.

Note that the same parts as in the conventional example are given the same numbers.

1 is a cylinder block, 2 is its cylinder, 3.4 is the front wall and side wall, and 5 is a water jacket formed on the outside of the cylinder 2.

Reference numeral 7 denotes an introduction tube installed so that its center is located on a line connecting the axes of each cylinder 2, and introduces cooling water, which is cooled by a cooling device such as a radiator and pumped by a water pump, into the water jacket 5. and
A V-shaped protrusion 71 serving as a deflecting member is provided at the center, and the outer circumferential portion 72 forms two introduction lowers A and 7B. A small hole T5 is provided for communication between the two.

The introduction lowers A and 7B are shaped so that the main flow of the pumped cooling water does not directly collide with the first cylinder 21 but flows through the water jackets 5a and 5b.

When cooling water cooled by a cooling device such as a radiator is pumped into the cooling structure configured in this manner by a water pump, the main flow of the cooling water flows into any cylinder 2 through the introduction lowers A and 7B of the introduction tube T. Also flows into the water jacket 5 without directly colliding with the water.

Therefore, the cylinder 21 adjacent to the introduction lowers A and 7B
Only the cylinder 2 is not overcooled compared to the other cylinders 2.

In addition, water jacket 5 is installed from introduction lower A and 7B.
The rear wall surface 73 of the introduction tube T due to the flow rate of the cooling water flowing into the
Even though cavitation may occur between the rear wall surface T3 and the cylinder 21, and this may cause corrosion, the provision of the small hole 75 that communicates from the introduction lower B to the rear wall surface T3 allows the rear wall surface 73 and the cylinder 21 to be connected from the introduction lower B to the rear wall surface T3. Since the pressure is compensated during this period, cavitation is prevented.

Incidentally, even if the small hole T5 is provided in this way, its size is extremely small.
is not supercooled.

As described above, according to the present invention, the main flow of cooling water from the water pump is introduced into the water jacket 5 provided around the cylinder 20 of the cylinder block 1 by the V-shaped protrusion on the tube T ball, and the main flow of the cooling water is introduced into the cylinder 21 adjacent thereto. By introducing the cylinders without direct collision, all the cylinders 2 can be cooled almost uniformly.

Furthermore, as described above, by providing the small hole 75 that communicates the introduction lower B with the rear wall surface 73, cavitation occurring between the rear wall m73 and the cylinder 210 can be prevented and corrosion can be eliminated, resulting in highly reliable cooling. It can provide structure.

In this embodiment, the introduction tube 7 is positioned on a line connecting the axes of the cylinders 2 on the front wall 3 of the cylinder block, but the introduction tube 7 is not limited to this. It can also be mounted on a wall.

For example, when the cylinder introduction T is mounted on the side wall 4 so as to be located between the cylinders, it is necessary to prevent the cooling water from the water pump from colliding with both cylinders.

Further, the introduction tube I may be manufactured integrally with the cylinder block 1, and furthermore, the introduction tube 7 may be formed by two introduction lowers A.
and 7B, but this is also not limited to this, and in addition, as a device for changing the flow of cooling water, the rear surface 13 of the introduction tube T as shown in FIGS.
A: Attach a current variable plate 74 made of metal or the like as a deflecting member to the cylinder 21 side, and connect the inlet, for example 7B, to the rear surface 7 of the current variable plate.
A small hole T that communicates with 3B (same as the rear wall surface 73 of the introduction tube)
5 may be provided.

In addition, although the present invention has been explained using a multi-cylinder engine, it is not a long time ago that the same effects as described above can be obtained even when applied to a single-cylinder engine.

[Brief explanation of the drawing]

Figure 1 is a vertical sectional view of the cylinder block, Figures 2 and 3 are
The figure is a cross-sectional view of Figure 1, Figure 2 shows the conventional example, and Figure 3 shows the conventional example.
The figure shows one embodiment of the present invention and shows an enlarged view of the main parts.
The drawings are a view taken from the top of FIG. 3, FIG. 5 shows another embodiment of the present invention, and FIG. 6 is a view taken from the bottom of FIG. 5. 1... Cylinder block, 2... Cylinder, 3, 4
...Front wall and side wall of cylinder block, 5...Water jacket, 1...Introduction tube, 7A, γB...
Inlet port, 11...Protrusion, 13...Introduction tube rear wall surface,
75...small hole.

Claims (1)

[Scope of utility model registration request] A cylinder block in which a water jacket is provided around the cylinder, when introducing cooling water into the water jacket, the cylinder block has a deflecting member provided on the wall surface of the cylinder block to prevent the main flow of the cooling water from directly colliding with the cylinder. A cooling structure for an internal combustion engine, characterized in that the cooling is carried out by an introduction action, and the introduction tube is further provided with a small hole that communicates the introduction port with a rear wall surface on the cylinder side adjacent to the introduction tube.