JPS6040840Y2 - Internal combustion engine cylinder liner cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for a cylinder liner of an internal combustion engine, and more particularly to a cooling device for a dry liner or sleeveless liner.

In the case of a multi-cylinder engine, the spacing between the cylinders is narrow, especially the upper part of the cylinder liner, so that cooling of this area is insufficient.

Particularly in the case of dry liners or sleeveless liners, the upper part of the liner tends to become particularly hot because the cooling water does not come into direct contact with them, resulting in uneven temperature distribution and thermal deformation of the cylinder liner. This causes an increase in oil consumption and blow-by, and also causes damage to the durability of liners and piston rings.

The present invention is an attempt to deal with such inconveniences, and the present invention aims to install a water conduit pipe that spouts cooling water toward the top of the liner inside the cylinder block in a dry liner or sleeveless liner type multi-cylinder engine. The liner is formed integrally with or separately from the liner, and cooling water is sprayed onto the top of the liner to actively cool this area.

Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a cylinder block of an engine, and inside the cylinder block 1, a large number of cylinder liners (or bosses for dry liners) 2 are provided.

3 is a water jacket formed in the cylinder block 1, and 4 is a cooling water communication hole.

In the conventional equipment, as shown in Figures 1 and 2, the cooling water only flows through the water jacket 3 in the direction of the arrow to cool the liner 2, which results in insufficient cooling, especially in the upper part of the cylinder liner. was.

In FIGS. 3 to 5 showing an embodiment of the present invention, reference numeral 5 denotes a cooling water conduit provided in the water jacket 3, and the cooling water conduit 5 is connected to the engine crankshaft (not shown) on the side of the cylinder liner 2. A plurality of nozzle holes 6 are provided in parallel to the liner, and a plurality of nozzle holes 6 are provided for spouting cooling water toward the upper part of the liner between the cylinders.

Therefore, in the device of the present invention, the cooling water is jetted out from the plurality of injection holes 6 formed in the cooling water conduit 5 toward the upper part of the liner between the cylinders as shown by arrow A, thereby actively cooling this part. It will be possible.

In a sub-combustion chamber type engine, the heat load on the side opposite to the sub-chamber is very high compared to other parts, so the cooling water conduit 5 is installed on the side opposite to the sub-chamber to connect the cylinders as shown in Fig. 4. In addition to the fountain directed toward the top of the liner (arrow A), a nozzle hole 7 is provided so that cooling water can also be sprayed at the top of the liner on the subchamber side (arrow B) to cool this area. It is desirable to do this proactively.

As described above, according to the present invention, a cooling water conduit is provided in the cylinder block parallel to the crankshaft of the engine, and cooling water is provided to actively cool the upper part of the cylinder liner through a plurality of nozzle holes provided in the conduit. This makes it possible to effectively cool the upper part of the cylinder liner, which can become particularly hot, and also allows water to be circulated up and down within the cylinder block, reducing the temperature of the cylinder liner. The distribution can be made uniform, and as a result, the durability of the cylinder liner and piston ring can be improved.

In addition, since the direction of the plurality of injection holes provided in the cooling water conduit can be freely and optimally selected, it becomes easy to cool the part of the upper part of the cylinder liner that is particularly desired to be cooled.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of a conventional cylinder liner cooling device, and FIG. 2 is a side sectional view of the same. 3 to 5 show embodiments of the present invention; FIG. 3 is a cross-sectional plan view of the cylinder liner cooling device of the present invention; FIG. 4 is a cross-sectional plan view of the sub-combustion chamber type engine; FIG. is a side sectional view of the one of FIG. 3; 1... Cylinder block, 2... Cylinder liner, 3... Water jacket, 4...
...Cooling water connection hole, 5...Cooling water conduit
6,7... Nozzle hole.

Claims (1)

[Scope of utility model registration request] An internal combustion engine with a dry liner or sleeveless liner type multi-cylinder engine in which a cooling water conduit with multiple injection holes that spouts cooling water toward the top of the liner is arranged in the cylinder block parallel to the engine's crankshaft. cylinder liner cooling system.