JPH10131803A - Cooler for cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the temp. of partitioning wall part connecting adjacent cylinders with a simple structure. SOLUTION: A cooling water suction outlet 22 is arranged in the vicinity of an opening 27 downstream of a cooling water passage 17 penetrating a partitioning wall 12 connecting adjacent cylinders. Water supply lines 24, 26 extending from the outlet 22 is communicated with the suction side of a water pump 2 via an auxiliary machine cooling part such as an oil cooler 23 or turbocharger 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder cooling device, and more particularly to a device for increasing the amount of cooling water flowing through a cooling water passage provided in a member connecting cylinders.

[0002]

2. Description of the Related Art As shown in FIG. 3, generally in an automobile engine, most of the cooling of an engine 1 is performed by cooling water forcedly circulated by a water pump 2 from a water jacket 4 of a cylinder block 3 to a water jacket of a cylinder head 5. 6 through a hot water passage 8 to a radiator 7 outside the engine 1, and the cooling water cooled by the radiator 7 is passed through a cold water passage 9 to a thermostat 10.
And the water is returned to the water jacket 4 of the cylinder block 3 by the water pump 2 again.

Hereinafter, the prior art will be described in detail. FIG. 4 is a top view in which a part of a conventional cylinder block is cut,
FIG. 5 is a sectional view of the cylinder head. The cylinder block 3 is of the in-line three-cylinder type having three cylinders 11, and adjacent cylinders 11 are connected by a partition wall 12 corresponding to the above member. A water jacket 4 of the cylinder block 3 for circulating cooling water is formed between the outer peripheral portion 13 of the cylinder 11 and the side wall 14 of the cylinder block 3, and the water jacket 4 is located on the intake side. ) And a water jacket 4b on the exhaust side (located on the side of the exhaust valve). The two are connected to each other at the front and rear end sides of the cylinder block 3.

At the front of the cylinder block 3, an inlet 15 to the water jacket 4 is opened to the water jacket 4a on the intake side so as to be offset.
The cooling water pressurized by the water pump 2 flows into the water jacket 4 through the inlet 15. Further, a water hole 16 is provided on the upper surface on the exhaust side of the cylinder block 3 so as to flow from the water jacket 4b toward the cylinder head 5. Accordingly, the total head value of the cooling water in the water jacket 4 is large on the intake side and small on the exhaust side, and the main flow of the cooling water flows from the water jacket 4a on the intake side to the water jacket 4b on the exhaust side. The water flows out from the water hole 16 toward the cylinder head 5. Further, in order to cool the upper part of the cylinder 11 particularly, the wall 12 is drilled from the water jacket 4b on the exhaust side to the water jacket 4a on the intake side.
A cooling water passage 17 communicating with b is opened, and the cooling water flows through the cooling water passage 17.

On the other hand, the cylinder head 5 is fixed with its lower surface aligned with the upper surface of the cylinder block 3, and has a combustion chamber 18 formed by recessing the lower surface and a water hole 19 through which cooling water is opened. Further, the water hole 19 is disposed so as to be in communication with the water hole 16 of the cylinder block 3. And the cylinder block 3
The cooling water flowing out of the water hole 16 is circulated to the water hole 19 of the cylinder head 5 and circulated to the water jacket 6b on the exhaust side inside the cylinder head 5. Further, the cooling water flows between the combustion chambers 18 and the water jacket 6a on the intake side.
After that, it flows out from the outlet 20 of the water jacket 6 provided at the rear part of the cylinder head 5 to the radiator 7 through the hot water passage 8. The cooling water flowing into the radiator 7 is cooled here, flows through the cold water passage 9, and returns to the suction side of the water pump 2 via the thermostat 10 again.

Further, the tip of the suction pipe 21 penetrating through the side wall 14 on the exhaust side of the cylinder block 3 is press-fitted so as to be substantially flush with the inner surface of the side wall 14. A suction opening 22 is formed in the water jacket 4b, and a water passage 24 communicating with a cooling portion of the oil cooler 23 is connected to the suction passage 22. The end of the water passage 24 is connected to the cold water passage 9 on the suction side of the water pump 2. Similarly, a water passage 26 communicating with the cooling section of the turbocharger 25 is connected, and the end of the water passage 26 is also connected to the cold water passage 9.
With the above configuration, the engine 1 is cooled during normal operation.

[0007]

However, in the above-described cooling device of the prior art, when the outside air temperature is high and the engine 1 is operated under a high load, the combustion chamber 1
8, the temperature of the upper part of the cylinder 11, which is close to the combustion chamber 18 as well as the combustion chamber 18, tends to increase.
In particular, it is desirable to lower the temperature of the upper part of the cylinder 11 on which a high-temperature piston (not shown) slides as much as possible. However, the interval between the cylinders 11 may not be large due to design constraints of the engine 1 or the like. Cooling water passage 1
No. 7 could not be increased, and the amount of cooling water for circulating it could not be further increased.

Under these circumstances, in order to prevent the deformation of the cylinder bore and the seizure of the piston, the value of the gap between the piston and the cylinder 11, that is, the so-called piston clearance, has been set to a large value, and the tension of the piston ring has been reduced. Or was set to. As a result, when operating in a low load range, there is a disadvantage that the consumption of lubricating oil is large, the noise of the engine 1 is large, and so on. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and has as its object to provide a cooling device for an engine that has a simple structure and increases the amount of cooling water flowing through a cooling water passage provided in a partition wall between cylinders.

[0009]

SUMMARY OF THE INVENTION The present invention has a difference between the total head values of the water jackets on the intake side and the exhaust side,
In a cooling structure of a cylinder in which a cooling water passage penetrating between the two water jackets is formed in a member connecting adjacent cylinders, a cooling water suction port is provided near a downstream opening of the cooling water passage. And a water passage extending from the suction port is connected to the suction side of the water pump via a cooling unit of an auxiliary device such as an oil cooler or a turbocharger.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below based on examples. The embodiment according to the present invention is different from the above-mentioned prior art except that the cooling water suction port is provided in the vicinity of the downstream opening of the cooling water passage provided between the cylinders. Are almost the same. Hereinafter, description of the same configuration will be omitted, and only different portions will be described. In the drawings, the same structures are denoted by the same reference numerals, and only different components are denoted by different reference numerals.

FIG. 1 is a top view of a part of a main part of a cylinder block according to an embodiment of the present invention, and FIG.
It is sectional drawing of the principal part which follows the A line. As shown in FIGS. 1 and 2, a water jacket on the exhaust side is provided on a partition wall 12 between the first cylinder 11 and the second cylinder 11 and a partition wall 12 between the second cylinder 11 and the third cylinder 11. 4b
A cooling water passage 17 is formed to penetrate the water jacket 4a on the intake side, and an opening 27 that opens to the water jacket 4b on the exhaust side is provided at the end thereof. The cooling water passage 17 is formed in a drill hole coaxial with the suction pipe 21 provided on the side wall 14 of the cylinder block 3.

The suction pipe 21 is press-fitted and fixed in a hole formed in the side wall 14 on the exhaust side of the cylinder block 3, and a suction port 22 opened at the tip thereof is formed with an opening 27 of the cooling water passage 17.
Is formed so as to extend inward from the inner surface of the side wall 14 so as to face and approach. The other end of the suction pipe 21 is provided so as to protrude outside the side wall 14, and is connected to the water passages 24 and 26 communicating with the oil cooler 23 and the turbocharger 25 from the protruding portion.

With the above configuration, the suction outlet 22 is formed so as to be close to the opening 27 of the cooling water passage 17, so that the oil cooler 23 and the turbocharger 25 are formed.
Since a large amount of cooling water flowing through the cooling water passage 17 can be sucked as a part of the cooling water flowing through the cooling water passage, the amount of cooling water flowing through the cooling water passage 17 can be increased.
Here, the case of an oil cooler or a turbocharger has been described, but the present invention is not limited to these two units, and any other unit that requires cooling may be used. Of course. In the description of this embodiment, the cooling water passage is formed by drilling. However, it goes without saying that the present invention is also applicable to the case where the passage is formed at the same time when the cylinder block is molded. Although the suction pipe has been described as being fixed coaxially with the cooling water passage, the invention is not necessarily limited to this. The suction port may be provided so as to approach the opening of the cooling water passage. Further, in the present embodiment, the description has been made using a three-cylinder engine. However, the present invention is not limited to this, and it goes without saying that the present invention can be applied to an engine having a plurality of cylinders.

[0014]

According to the present invention, the following effects can be obtained. The suction outlet of the water passage communicating with the suction side of the water pump via an oil cooler or a turbocharger is installed near the opening of the cooling water passage formed through the partition wall connecting the cylinders. Therefore, a large amount of the cooling water flowing through the cooling water passage is sucked together with the cooling water sucked into the oil cooler or the turbocharger, so that the amount of the cooling water flowing through the cooling water passage can be increased more than the conventional one. As a result, the temperature of the high-temperature cylinder upper portion near the partition wall can be reduced, deformation of the cylinder bore and the like can be suppressed, and the piston clearance can be set small, so that consumption of lubricating oil is reduced and engine noise is also reduced. The effect is obtained. Also,
The advantage is that the structure can be simplified, the cost can be reduced, and the present invention can be implemented without major changes to the conventional engine manufacturing equipment.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional top view of a cylinder block according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part taken along line AA of FIG.

FIG. 3 is a block diagram showing a cooling water path of the engine.

FIG. 4 is a top view of a part of a conventional cylinder block.

FIG. 5 is a sectional view of the cylinder head.

[Explanation of symbols]

 2 Water pump 4a Water jacket on intake side 4b Water jacket on exhaust side 11 Cylinder 12 Member (partition wall) 17 Cooling water passage 22 Suction outlet 23 Oil cooler 24 Water passage 25 Turbocharger 26 Water passage 27 Opening

Claims (1)

[Claims] 1. A cooling water passage which has a difference between total head values of water jackets on an intake side and an exhaust side and penetrates between water jackets in a member connecting adjacent cylinders. In the cooling structure of the cylinder, a cooling water suction port is provided in proximity to the opening on the downstream side of the cooling water passage, and a water passage extending from the suction port is used to cool an auxiliary device such as an oil cooler or a turbocharger. A cooling device for a cylinder, which is connected to the suction side of a water pump via