JPS6139491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an engine cooling system, and more particularly to an engine cooling system that can efficiently cool cylinder block liners.

Generally, an intake port and an exhaust port are formed in the cylinder head of an engine so as to open toward the combustion chamber from different sides, and water is provided around the exhaust port and the combustion chamber to cool them. A jacket is formed. On the other hand, the cylinder block is formed with an intake side water jacket and an exhaust side water jacket along the liner row, and the cooling water discharged from the water pump is directed to the intake side and exhaust side water jacket of the cylinder block. After being allowed to flow, it is made to flow into a water jacket on the cylinder head side to cool the combustion chamber and exhaust port area of the engine, which are particularly at high temperatures.

However, since the space between the adjacent liners of the cylinder block receives heat from both combustion chambers, the temperature is extremely high and the need for cooling is particularly high. Therefore, conventionally, as disclosed in Japanese Patent Publication No. 51-45732, etc., an inter-liner water jacket is installed between adjacent liners of a cylinder block, which communicates with the intake side and exhaust side water jackets along the liner row. It is attempted to form a bucket to provide efficient cooling between adjacent liners.

However, if the inter-liner water jacket is simply provided, the cooling water from the intake side and exhaust side water jackets may collide with each other in the inter-liner water jacket, causing the cooling water to flow into the inter-liner water jacket. There was a problem in that the amount of water did not flow sufficiently and the expected cooling effect could not be obtained.

The present invention was made in view of the above, and in the cylinder block, the cooling water from the water pump mainly flows into the water jacket on the intake side, while the water on the exhaust side flows into the water jacket on the cylinder head side. By introducing the cooling water from the jacket, a cooling water path is created in which the cooling water flows from the intake side water jacket, through the water jacket between the liners, to the exhaust side water jacket, and then is introduced into the cylinder head side water jacket. In this engine, cooling water can flow sufficiently through the water jacket between the liners to efficiently cool the liners, and at the same time, the area around the exhaust port can also be efficiently cooled. The purpose of this project is to provide a cooling device.

That is, the present invention provides a cylinder head that has an intake port and an exhaust port that open toward the combustion chamber from different sides, and a water jacket that cools the exhaust port and the combustion chamber, and an intake side water jacket that cools the exhaust port and the combustion chamber. In an engine equipped with a cylinder block having a jacket and an exhaust side water jacket and an inter-liner water jacket located between adjacent liners and communicating with the intake side and exhaust side water jackets, the water jacket is discharged from a water pump. The cylinder head is configured so that the cooling water mainly flows into the intake side water jacket, and a communication passage is formed in the cylinder head to communicate the exhaust side water jacket and the cylinder head side water jacket. It is something.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1 to 3 show an example in which the present invention is applied to an in-line four-cylinder engine, and 1 and 2 are cylinder heads and cylinder blocks that constitute the engine, and the cylinder head 1 has four cylinders on the bottom surface. Two combustion chambers 3, 3... are formed in series, and an intake port 4 and an exhaust port 5 are connected to the combustion chamber 3 from different intake and exhaust side surfaces 1a and 1b, respectively. A water jacket 6 is formed around the exhaust port 5 and the combustion chamber 3 to cool the exhaust port 5 and the combustion chamber 3.

On the other hand, in the cylinder block 2, four liners 8, 8, . . . forming the cylinder 7 are provided in series corresponding to the combustion chambers 3, 3, . 8...
... Along the row, the intake side water jacket 9 and the exhaust side water jacket 10 are connected to the liner 8...
An inter-liner water jacket 11 is formed between each of the adjacent liners 8, 8, and communicates with the intake side and exhaust side water jackets 9, 10.

Furthermore, a directly attached type water pump 12 is disposed on one end surface (the right end surface in FIG. 2) of the cylinder block 2. The water pump 1
2 has a suction port 12a and a discharge port 12b communicating with the cooling water passage 13, and a casing 12c fixed to the cylinder block 2;
a pump shaft 12d rotatably supported by 2c;
A pulley 12 is fixed to one end of the pump shaft 12d and is driven by a crankshaft (not shown) and a belt.
e and the cooling water fixed to the other end of the pump shaft 12d and flowing in from the suction port 12a is pressurized to the discharge port 1.
The discharge port 12d is opened to the intake side and exhaust side water jackets 9, 10, and is driven by a crankshaft (not shown) to discharge cooling water. The cooling water from the passage 13 is transferred to the intake and exhaust side water jackets 9 of the cylinder block 2.
10.

As a feature of the present invention, a barrier portion 14 is provided on the inner wall of the exhaust-side water jacket 10 in the vicinity of the discharge port 12b of the water pump 12 to face the discharge port 12b. The cooling water is transferred to the barrier section 14.
Only a part of the water is guided by the water jacket 10 on the exhaust side and most of it flows into the water jacket 9 on the intake side, for example, at a ratio of 3:7, and thus the water pump 12
Cooling water mainly flows from the intake side water jacket 9.
It is structured so that it flows.

Furthermore, on the exhaust side side surface 1b side of the lower part of the cylinder head 1, there are a number of communication passages 1 that communicate the exhaust side water jacket 10 of the cylinder block 2 and the water jacket 6 on the cylinder head 1 side.
5, 15, . . . are formed at opposing positions between the liners 8, 8 and at approximately intermediate positions therebetween. That is, the communication passage 15 constitutes a cooling water inlet from the cylinder block 2 to the cylinder head 1, and the inlet is arranged to face the exhaust side water jacket 10.

As described above, the cooling water from the water pump 12 is caused to flow mainly into the intake side water jacket 9 of the cylinder block 2, and the inter-liner jacket 11
A cooling water path is constructed in which the cooling water is introduced into the water jacket 10 on the exhaust side through the water jacket 10 on the exhaust side, and then introduced from the water jacket 10 on the exhaust side through the communication path 15 to the water jacket 6 on the side of the cylinder head 1. There is.

A portion of the cooling water that has flowed into the water jacket 6 on the cylinder head 1 side flows from the other end of the cylinder head 1 through the thermostat 16, and then through the radiator (not shown) to the water pump 12.
The remaining air is circulated from the intake-side side surface 1a of the cylinder head 1, through the intake air heating section of the intake manifold 17 connected to each intake port 4, through a heater (not shown), and to the water pump 12. It is configured. In addition, the water pump 12
A portion of the cooling water discharged from the cylinder head 1 is configured to flow directly into the water jacket 6 on the cylinder head 1 side. In addition, 18 is the exhaust port 5
An insertion hole 19 for inserting a valve stem of an exhaust valve (not shown) installed in the opening to the combustion chamber 3 is a valve seat portion formed in the opening.

Next, the operation of the above embodiment will be explained.
The cooling water discharged from the water pump 12 attempts to flow into both the intake side and exhaust side water jackets 9 and 10 of the cylinder block 2, but the cooling water flows into the barrier portion 14 provided on the inner wall of the exhaust side water jacket 10. Due to barrier and guide effects,
Only a part of it flows into the exhaust side water jacket 10, and most of it flows into the intake side water jacket 9. The cooling water that has flowed into the intake side water jacket 9 cools the intake side portion of the cylinder block 2, and then passes through the communication passage 15 that constitutes the cooling water inlet from the cylinder block 2 to the cylinder head 1.
... is provided facing the exhaust side water jacket 10, so that the water jacket 11 between the liners is connected from the intake side water jacket 9 to the water jacket 11 between the liners.
It flows into the exhaust side water jacket 10 through ...... As a result, the cooling water flows smoothly and sufficiently into the water jackets 11 between the liners, and the space between the liners 8 can be efficiently cooled.

Thereafter, the cooling water that has flowed into the exhaust side water jacket 10 flows into the cylinder block 2 together with the cooling water that has flowed directly from the water pump 12.
After cooling the exhaust side portion of the cylinder head 1, the water jacket 6 of the cylinder head 1 is cooled through the communication passage 15...
and exhaust port 5 of cylinder head 1...
and the combustion chamber 3... is cooled. At that time, relatively low-temperature cooling water after cooling the cylinder block 2 is first introduced into the exhaust side part (around the exhaust port 5), which is a particularly high temperature part of the cylinder head 1. Port 5: The surrounding area can be efficiently cooled.

After that, a portion of the cooling water in the water jacket 6 of the cylinder head 1 is supplied to the thermostat 1.
6 to a radiator (not shown), the remainder flows to a heater (not shown) via an intake air heating section of an intake manifold 17, and then is returned to the water pump 12 again.

Therefore, the cooling water can circulate throughout the cylinder block 2 and the cylinder head 1 to efficiently cool each of them, and in particular, there is sufficient cooling water between the liners 8 and 8, which require cooling. In addition, after cooling the cylinder block 2, the relatively low-temperature cooling water cools the exhaust port 5 of the cylinder head 1... and cools the high-temperature exhaust gas. Port 5... The surrounding area can also be efficiently cooled. Therefore, the entire engine can be cooled with a relatively small amount of cooling water, and the driving loss and weight of the engine can be reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but also includes various other modifications. For example, in the above embodiment, water pump 1
Most of the cooling water discharged from the cylinder block 2 is distributed to the water jacket 9 on the intake side of the cylinder block 2 and a part is distributed to the water jacket 10 on the exhaust side by the barrier part 14. All of the cooling water from the liner 12 may be allowed to flow into the intake side water jacket 9, and as in the above embodiment, the cooling water can be sufficiently circulated through the inter-liner water jacket 11, but in this case, Since it becomes difficult for cooling water to flow into the exhaust side water jacket 10 behind the barrier portion 14, and the cooling effect in that portion is reduced, the configuration as in the above embodiment is preferable.

Further, as a means for configuring the cooling water from the water pump 12 to mainly flow into the intake side water jacket 9, the barrier portion 14 as in the above embodiment is used.
In addition to providing the water pump 12, it is also possible to adopt measures based on the structure of the water pump 12 itself, such as shifting the water pump 12 toward the intake side water jacket 9.

Further, in the above embodiment, the water pump 12 is of a directly attached type, but it goes without saying that an independent type may also be used. Furthermore, it goes without saying that the present invention can be similarly applied to multi-cylinder engines other than the four-cylinder engine described in the above embodiment.

As explained above, according to the engine cooling system of the present invention, the cooling water discharged from the water pump is caused to flow mainly into the water jacket on the intake side of the cylinder block, and the cooling water is also flowed from the water jacket on the exhaust side of the cylinder block. Since the cooling water is introduced into the water jacket of the cylinder head, sufficient cooling water can flow through the water jacket between the liners of the cylinder block and cooling between the liners can be performed efficiently. The surroundings can also be efficiently cooled, and the cooling efficiency of the entire engine is improved, thereby reducing the driving loss and weight of the engine. Further, it has the advantage that it can be implemented easily and inexpensively by simply modifying the structure of an existing one.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the present invention, and FIG. 1 is an exploded perspective view showing the overall general configuration, FIG. 2 is a longitudinal sectional front view of the cylinder head, and FIG. 3 is a cross-sectional plan view of the cylinder block. 1... Cylinder head, 1a... Intake side side,
1b...Exhaust side side, 2...Cylinder block,
3...Combustion chamber, 4...Intake port, 5...Exhaust port, 6...Cylinder head side water jacket, 8...Liner, 9...Intake side water jacket, 10...Exhaust side water jacket Ass,
11... Liner-to-liner water jacket, 12...
...Water pump, 14...Barrier section, 15...Communication path.

Claims (1)

[Claims] 1. A cylinder head having an intake port and an exhaust port that open toward the combustion chamber from different sides, and a water jacket that cools the exhaust port and the combustion chamber, and an intake side water jacket and an exhaust side along the liner row. In an engine equipped with a cylinder block having a water jacket and an inter-liner water jacket located between adjacent liners and communicating with the intake side and exhaust side water jackets, the cooling water discharged from the water pump is mainly used. 1. A cooling device for an engine, characterized in that said water jacket is configured to flow into an intake side water jacket, and a communication path is formed in a cylinder head to communicate said exhaust side water jacket with a cylinder head side water jacket.