JPS6123634Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cooling channel device for an internal combustion engine, and more specifically, a common boundary wall between adjacent cylinders, for example, an odd-numbered cylinder and an even-numbered cylinder, a so-called siyamise. Install a bore wall,
The present invention relates to a cooling waterway device for an internal combustion engine in which a cooling waterway is provided in the boundary wall.

As a conventional device of this type, for example,
As described in Japanese Patent No. 52-52113, it is known that a cooling water channel is provided that diagonally penetrates the Siyamise bore wall from the top surface of the cylinder block. However, if such a structure is adopted, it is necessary to provide a water channel on the bottom surface of the cylinder head opposite to the top surface of the cylinder block, which not only requires an extra machining process, but also requires a gasket between the cylinder block and the cylinder head. However, because of the provision of a communicating waterway, there was a drawback of poor sealing.

In addition, in the device described in Japanese Utility Model Publication No. 52-54682, in which cross-shaped drill holes are provided in the Siyamise bore wall, the drill blade is easily deformed at the cross section.
There were drawbacks such as breakage of the drill bit and deterioration of hole accuracy. In order to overcome these drawbacks and enable drilling, it was necessary to partially remove the outer wall of the cylinder block.

The present invention was made to improve the above-mentioned disadvantages, and a pair of drilling seats formed by removing molding sand etc. are provided in the cooling channels on both sides of the boundary wall for the cylinder row, and one of the seats is formed by removing molding sand, etc. By providing a drilled waterway that diagonally penetrates the Saiyamise bore wall from one seat to the other, the amount of cooling water flowing into the processing waterway is increased, and the sealing performance is good and drilling is easy. The object of the present invention is to obtain a cylinder block cooling waterway device with excellent hole accuracy.

Hereinafter, details of the present invention will be explained along with embodiments shown in the drawings.

1 to 4 illustrate an embodiment of the present invention. In the figures, the reference numeral 1 indicates an internal combustion engine, which is composed of a cylinder head 2 and a cylinder block 3, both of which have a gasket 4. It is firmly screwed and fixed by a head bolt 4a via the head bolt 4a.

Reference numeral 5 indicates cylinder bores, and the bores are separated by a common Siyamese bore wall 6. Those indicated by symbols 7 and 8 are cooling waterways,
These cooling waterways 7 and 8 are connected to waterways 7a and 8a in the cylinder block, and the cylinder head 2 which communicates with the waterways 7a and 8a.
It consists of side waterways 7b and 8b, and the two are continuous via triangular waterways 7c and 8c. The water channels 7a and 8a in the cylinder block 3 communicate with the discharge side of the water pump 9, and the cooling water flows through the first
As shown by the arrow 10 in the figure, it passes through water channels 7c and 8c, and then passes through water channels 7b and 8b on the cylinder head 2 side,
Thermostat 11, water channel 12, radiator 13
The water is circulated to the suction side water channel 14 of the water pump 9 through the water pump 9. Reference numeral 15 is an arrow indicating the direction of water flow within the water channels 7a, 8a.

On the other hand, those indicated by reference numerals 16 and 19 are convex drilling seats formed in water channels 7a and 8a formed parallel to the cylinder row along the circumferential surface of the cylinder bore 5, that is, on the one water channel 8a side. By removing the casting sand as a core with a seat for drilling having a flat part formed at both end portions of the Saiyamise bore wall 6 facing upstream of the waterway 8c and the waterway 7c on the other waterway 7a side. Formed in a convex shape.

As a result, the axis of the drill can face the drilling seat 16 at right angles, making it easy to position the drill and improving accuracy.
It is possible to prevent deformation and breakage of the drill, and it is also possible to easily form a complex-shaped waterway, such as the waterway upstream from the top surface 3a of the cylinder block 3, resulting in good productivity.

The drill hole 17 formed from this drilling seat 16 through the Saiyamise bore wall 6 is a fine hole with a diameter of approximately 2 to 5 mm, and has an inclination angle of approximately approximately 2 to 5 mm with respect to the top surface (horizontal surface) 3a of the cylinder block 3. It is inclined at θ=20° to 38°.

Therefore, the cooling water discharged by the water pump 9 flows parallel to the cylinder head 2 side along the periphery of the cylinder bore 5 via the water channels 7a and 8a. The Siyamese bore wall 6, which is a boundary wall, is communicated through the hole 17 and is cooled by cooling water flowing from the drilling seat 19 below the bore 5 to the drilling seat 16.

At this time, since a convex seat 19 was also provided at the opening of the drill hole 17 toward the water channel 7a, the opening was opened in the direction opposite to the flow of cooling water.
The cooling water can easily flow into the drill hole 17, the amount of cooling water can be increased, and the cooling effect can be further improved.

As a result, during the stroke of the piston 18, the temperature of the Saiyammies bore wall 6 during the crank angle displacement of 90 degrees from the top dead center position is at most 160 degrees.
It can be cooled to below ℃, which can reduce piston burnout, wear, lubricant consumption, etc.

Since this embodiment is configured as described above,
The drill hole 17 is not formed in the top surface of the cylinder block 3, but in a triangular passage 8 communicating with the cylinder head.
Since it is formed facing the gasket 4, there is no need to open a new communication hole in the gasket 4, and the sealing performance is improved, machining is easy, and the inclination angle θ can be reduced.

FIG. 5 illustrates another embodiment of the present invention. In the figure, the same parts as in FIGS. 1 to 4 are denoted by the same reference numerals, and the explanation thereof will be omitted.

In this embodiment, a plurality of (two) drilling seats 16 are provided, each having a different inclination angle θ ₁ ,
Since the drill holes 17a and 17b of θ ₂ were formed,
The temperature of the siyamise bore wall 6 can be further reduced over the entire stroke of the piston.

Furthermore, according to the inventor's experiments, the inclination angle θ ₁ ≒
It was found that the cooling effect becomes even greater when the angle is 20° to 38° and θ ₁ <θ ₂ <55°.

By configuring as in each of the above embodiments, the wall thickness of the common Siyamise bore wall 6 that separates the cylinder bores can be reduced to about 4 to 8 mm, and by shortening the length of the cylinder row, , the cylinder block, cylinder head, crankshaft, intake and exhaust manifolds, etc. can be shortened, the weight of the entire engine can be significantly reduced, and the fuel efficiency of the vehicle can be significantly improved. Note that by end milling the end face of the drilling seat 16 through the relatively large triangular passage 8c, a drill hole can be formed with high precision.

As is clear from the above description, according to the present invention, drilling seats formed by removing casting sand are provided in both of the cooling channels formed in parallel along the bores of the cylinder row. A drilled waterway is provided from one seat to the other seat, diagonally penetrating the Saiyamise bore wall, and the other seat is configured to face the flow of cooling water, allowing the drilled waterway to flow through the bore wall diagonally. The cooling effect can be further improved by increasing the amount of cooling water in the cylinder block, and the cooling water channel can be easily formed in a complex-shaped water channel upstream of the top surface of the cylinder block, thereby increasing productivity.

[Brief explanation of the drawing]

Figures 1 to 4 are for explaining one embodiment of the present invention. Figure 1 is a vertical sectional side view of an internal combustion engine, Figure 2 is an enlarged sectional view of the main part of a cylinder, and Figure 3 is a cylinder block. A plan view, FIG. 4 is a sectional view taken along the line A--A in FIG. 2, and FIG. 5 is an enlarged sectional view of a main part of another embodiment of the present invention. 1...Internal combustion engine, 2...Cylinder head, 3...
...Cylinder block, 4...Gasket, 5...
Cylinder bore, 6...Siyamise bore wall, 7,
8...Cooling channel, 9...Water pump, 11...
... Thermostat, 12 ... Water channel, 13 ... Radiator, 16, 19 ... Drilling seat, 17
...Drill hole.

Claims (1)

[Scope of utility model registration request] In a cooling waterway device for an internal combustion engine, which has a boundary wall between adjacent cylinders, a drilled cooling waterway provided in the boundary wall, and a cooling waterway formed around the periphery of the cylinder bore, cooling on both sides of the boundary wall with respect to the cylinder row is provided. A pair of drilling seats formed in a convex shape in the waterway and having a flat part near the opening is provided, and drilling is performed to penetrate the boundary wall in an oblique direction from one seat to the other seat. 1. A cooling water channel device for an internal combustion engine, characterized in that a water channel is provided, and the other seat is opposed to a flow of cooling water.