JP2604041Y2 - Cylinder block for internal combustion engine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a cylinder block for an internal combustion engine.

[0002]

2. Description of the Related Art Conventionally, in order to reduce the size of an engine,
A configuration is known in which adjacent cylinder bores are brought close to each other to connect the cylinder walls to each other (NDU8).
858 public number). In this case, a bimetallic baffle plate that generates turbulence in the cooling water flowing near the connecting portion is provided on the inner surface of the water jacket around the cylinder bore in order to enhance the cooling performance of the connecting portion between the cylinder walls.

[0003] Further, as one of means for improving the cooling performance of the connecting portion between the cylinder walls, an example of forming a cooling water passage penetrating the connecting portion is often seen.

[0004]

However, since such a cooling water passage opens in a direction substantially orthogonal to the flow of the cooling water flowing around the cylinder bore, the flow of the cooling water is poor and the connecting portions of the cylinder walls are mutually connected. There was a problem that it was not possible to cool as well as expected. Therefore, it is conceivable to form a rectifying projection on the inner surface of the water jacket that actively guides the flow of the cooling water to the cooling water passage at the connection portion. In the processing hole (blocked by the blind plug after the formation of the cooling water channel), the most necessary part of the straightening projection directly facing the cooling water channel is chipped off. Since the conventional baffle plate generates a turbulent flow of the cooling water, there is a fear that the flow to the cooling water passage may be deteriorated.

[0005] In order to solve such a problem, an object of the present invention is to secure a good flow to a cooling water channel by using a blind plug for closing a hole for drilling.

[0006]

In order to solve the above-mentioned problem, the cooling water is provided so that adjacent cylinder bores are brought close to each other to connect the cylinder walls to each other and to penetrate the connection portion in a direction perpendicular to the row of bores.
In a cylinder block of an internal combustion engine having an inclined drill hole as a passage, a rectifying projection for directing cooling water flowing around the cylinder bore to an inclined cooling water passage between the bores to a blind plug closing a drill hole drilling hole opened on the outer wall thereof. As cold
Provide an upright plate approximately perpendicular to the flow direction of the water
It forms a hypotenuse portion for upwardly urging the cooling water.

[0007]

[Action] Drill holes without changing the mold of the cylinder block.
By using the blind plug that closes the hole for construction, an effective rectifying protrusion can be easily formed at an appropriate position corresponding to the cooling water passage between the bores. The rectification protrusion is an upright plate and its
Consists of a hypotenuse at the tip and stands up regardless of the simple configuration
Efficiently increases the flow rate to the cooling water channel inclined at the slope of the plate
Can be done.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIGS. 1 and 2, reference numeral 1 denotes a cast cylinder block which is formed so that adjacent cylinder bores 2 are brought close to each other to connect cylinder walls 3 to each other. Reference numeral 4 denotes a water jacket around the cylinder bore 2, which is provided with an inlet 6 communicating with the cooling water passage 5 outside the cylinder block 1 and an outlet (not shown) communicating with the water jacket of the cylinder head. The cooling water channel 5 is formed by sealing the opening of the cooling water channel 5 together with a water channel portion formed on one side outer wall of the cylinder block after drilling holes to be described later.

The cylinder bore 2 is provided with a cooling water passage 9 penetrating through a connecting portion 8 between the cylinder walls 3.
It is formed as a drill hole that is slightly upwardly inclined from the drill hole processing hole 10 that opens on the outer wall on one side. Reference numeral 11 denotes a blind plug for closing the drilling hole 10 after the formation of the cooling water passage 9, and a cooling water flow on the inner surface thereof as a rectifying projection 12 for directing the cooling water flowing through the water jacket 4 to the cooling water passage 9.
An upright plate substantially orthogonal to the direction is provided. As shown in FIG. 3, the upright plate 12 has its tip formed on an oblique side 13 having an opposite direction corresponding to the inclination angle of the cooling water passage 9, and the cooling water flowing through the gap between the connecting portion 8 and the upward flow into the cooling water passage 9. Is caused to occur.

With this configuration, the cooling water flows from the cooling water passage 5 outside the cylinder block 1 to the water jacket 4.
And flows around the cylinder bore 2 while depriving the cylinder wall 3 of heat, and is guided to the water jacket of the cylinder head.
, The flow straightens to the cooling water passage 9 by the rectifying projections 12 of the blind plug 11. Therefore, the flow rate of the cooling water to the cooling water passage 9 that penetrates the connecting portion 8 between the cylinder walls 3 is greatly increased, so that good cooling performance between the cylinder bores 2 can be secured.

Since the straightening projections 12 are formed on the blind plugs 11 which close the holes 10 for machining the cooling water passages, the cooling water passages 9 can be formed without changing the mold of the cylinder block 1 as in the prior art.
By driving the blind plug 11 after the formation of the cooling water passage 9, the blind plug 11 can be formed very easily at a required position directly facing the cooling water passage 9 between the cylinder bores 2. In addition, since an upward flow is generated at the oblique side portion 13 of the rectifying protrusion 12, the flow rate to the inclined cooling water passage 9 can be efficiently increased.

[0012]

In summary, according to the present invention, adjacent cylinder bores are brought close to each other to connect the cylinder walls to each other and to penetrate the connecting portion in a direction orthogonal to the row of bores.
In a cylinder block of an internal combustion engine equipped with a drill hole that is inclined as a cooling water channel, as a rectifying projection that directs the cooling water flowing around the cylinder bore to the cooling water channel between the bores, to a blind plug that closes a hole for drilling hole opening on the outer wall cooling
An upright plate that is substantially perpendicular to the water flow direction is provided, and the cooling water channel side
Since a hypotenuse that urges the cooling water upward at the tip is formed , a straightening protrusion effective to enhance the cooling performance between the cylinder bores can be inserted between the cylinder bores by driving a blind plug without changing the mold of the cylinder block. Appropriate for the cooling water channel
The effect that it can be formed very easily in a suitable position is obtained.

[Brief description of the drawings]

FIG. 1 is a horizontal sectional view of a cylinder block.

FIG. 2 is a partially enlarged view of FIG.

FIG. 3 is a sectional view of a blind plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder block 2 Cylinder bore 3 Cylinder wall 4 Water jacket 8 Connecting part 9 Cooling channel 10 Hole for drilling hole 11 Blind plug 12 Straightening protrusion

Claims (1)

(57) [Scope of request for utility model registration] The present invention is characterized in that adjacent cylinder bores are brought close to each other to connect the cylinder walls to each other, and that the connecting portion is formed as a bore row.
Equipped with inclined holes as cooling water passages that penetrate in the orthogonal direction
In a cylinder block of obtaining an internal combustion engine, the blind plug closing the hole for drilled hole processing which opens to an outer wall, substantially perpendicular to the coolant flowing through the cylinder bores around the flow direction of the cooling water as a rectifying protrusions directed to the cooling water passage between the bore Upright board
At its tip, forming a hypotenuse that urges the cooling water upward.
A cylinder block of an internal combustion engine, characterized in that form have.