JP2003254152A - Engine cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine cooling device as improvement of a conventional arrangement involving such problems as a decreased degree of freedom in the layout of the suction port part and exhaust port part and also the design of the combustion system including the valve diameter, etc., and as an eccentric thermal balance inside the cylinder head. <P>SOLUTION: The engine cooling device consisting of cooling water passages 12 arranged around the combustion chamber is structured so that a water flow shutoff ribs 2a are provided between the adjacent cylinders in the counter- exhaust manifold 5 side cooling water passage 12 in the cylinder head 2, and the flow regulation of the cooling water is conducted by the water flow shutoff ribs 2a. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an engine cooling device constituted by a cooling water passage provided around a combustion chamber.

[0002]

2. Description of the Related Art Conventionally, a combustion chamber and intake / exhaust valves of an engine are cooled by a cooling water passage formed in a cylinder head or the like arranged around the combustion chamber. For example, as shown in FIG. 5, a cooling water passage 112 is formed inside the cylinder head 102. The inflow water channel 112a for allowing the cooling water to flow into the cooling water channel 112 from the lower surface of the cylinder head 102 to the cooling water channel 112.
112 b is open, and the inflow water channels 112 a and 112
While the cooling water flowing from b flows through the cooling water passage 102, an intake port portion 103 in which an intake valve is fitted, an exhaust port portion 104 in which an exhaust valve is fitted, and a combustion chamber arranged below the cylinder head 102. After cooling etc., it is discharged from the cooling water outlet 112d. Since the width of the water passage between the intake port portion 103 and the exhaust port portion 104 is narrow, it is difficult to cool because the amount of cooling water that passes by the natural flow is small, but it is difficult to cool the intake port portion 103 and the exhaust port portion 104. If it is not possible to sufficiently cool the above-mentioned portion, the temperatures of the intake valve and the exhaust valve will rise and the output of the engine will be limited. Therefore, the intake port section 1
03 and the exhaust port section 104, the inter-valve jet section 112c for ejecting a jet flow is formed, and the intake port section 1
03 and the exhaust port section 104 are forcibly cooled.

[0003]

However, in order to form the intervalve jet portion 112c in the cylinder head 102 as described above, a certain amount of space is required in the cylinder head 102, so the intake port portion 103 and the exhaust port portion are formed. The degree of freedom in designing the combustion system, such as the layout of 104 and the valve diameter, has been reduced. In particular, in a four-valve engine having two intake valves and two exhaust valves, it is difficult to form the intervalve jet portion 112c due to the layout of the intake valves, the exhaust valves, and the fuel injection valves. The cooling water flowing from the inflow water passages 112a and 112b is discharged from the cooling water outlet 112d after cooling the intake port portion 103 and the exhaust port portion 104 while passing through the cooling water passage 112, but is formed in each cylinder portion. The inflow water channels 112a and 112b are formed to have the same diameter, and the cooling water channel 10 near the cooling water outlet 112d.
2, the flow velocity is high and the cooling effect is high, but the cooling water outlet 11
In the cooling water channel 102 located away from 2d, the flow velocity is slow and the cooling effect is weak, so that the heat balance in the cylinder head 102 is biased. Further, the cooling water flowing from the inflow water passage 112a formed on the side opposite to the exhaust manifold and the inflow water passage 11 formed on the exhaust manifold side
Since the flow path is different from that of the cooling water flowing from 2b, the cooling effect is different between the side of the cylinder head 102 opposite to the exhaust manifold side and the side of the exhaust manifold.

[0004]

The problems to be solved by the present invention are as described above. Next, the means for solving the problems will be described. That is, according to the first aspect of the present invention, in the engine cooling device including the cooling water passage provided around the combustion chamber, a partition wall is provided between the adjacent cylinders of the cooling water passage on the side opposite to the exhaust manifold of the cylinder head, and the cooling water is provided by the partition wall. Adjust the water flow.

Further, according to a second aspect of the present invention, in the engine cooling device constituted by the cooling water passage provided around the combustion chamber, the inflow water passage area of the cooling water passage on the side opposite to the exhaust manifold of the cylinder head is set to the cooling water passage on the exhaust manifold side. A restricting member that is larger than the area of the inflow channel is provided between the cylinder head and the cylinder block.

According to a third aspect of the present invention, in the engine cooling device, the area of the inflow water passage on the side opposite to the cooling water outlet of the cooling water passage arranged in each cylinder is larger than the area of the inflow water passage on the side of the cooling water outlet. A regulating member that regulates the above is provided between the cylinder head and the cylinder block.

Further, according to a fourth aspect of the present invention, in the engine cooling device constituted by the cooling water passage provided around the combustion chamber, a partition wall is provided between the adjacent cylinders of the cooling water passage on the anti-exhaust manifold side of the cylinder head to provide anti-exhaust gas. The inflow channel area of the cooling water channel on the manifold side was made larger than the inflow channel area of the cooling water channel on the exhaust manifold side.

According to a fifth aspect of the present invention, in a cooling device for an engine constituted by a cooling water passage provided around a combustion chamber, a partition wall is provided between adjacent cylinders of a cooling water passage on the side of an exhaust manifold of a cylinder head, and each cylinder has a partition wall. The area of the inflow water channel on the side opposite to the cooling water outlet of the cooling water path arranged at is made larger than the area of the inflow water channel on the side of the cooling water exit.

Further, according to a sixth aspect of the present invention, in the engine cooling device constituted by the cooling water passage provided around the combustion chamber, the inflow water passage area of the anti-exhaust manifold side cooling water passage is set to the inflow water passage of the exhaust manifold side cooling water passage. The area of the inflow water channel on the side opposite to the cooling water outlet in the cooling water path arranged in each cylinder is made larger than the area of the inflow water channel on the side of the cooling water.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. 1 is a plan sectional view showing a cylinder head of an engine equipped with the cooling device of the present invention, FIG. 2 is a side sectional view of the same, FIG. 3 is an enlarged plan sectional view showing an intake / exhaust port portion of the cylinder head, and FIG. 4 is a gasket. FIG. 5 is a plan view showing a conventional cooling device.

The engine cooling device of the present invention will be described. As shown in FIGS. 1 and 2, the engine of this example is a four-valve engine in which two intake valves 21 and two exhaust valves 22 are provided in each cylinder. In each cylinder, an intake port portion 3/3 in which an intake valve 21 is fitted and an exhaust port portion 4/4 in which an exhaust valve 22 is fitted are formed. Further, an injection valve hole portion 6 through which the fuel injection valve is inserted is formed at the center position of the intake port portions 3 and 3 and the exhaust port portions 4 and 4 which are arranged inclined with respect to the longitudinal direction of the cylinder head 2. Has been done. An exhaust manifold 5 is attached to one side of the cylinder head 2 so as to communicate with the exhaust port portions 4 of each cylinder.

A cooling water passage 12 is formed in the cylinder head 2 (in FIG. 1 and FIG. 3, the area shown by a thin dot is the cooling water passage 12). Inflow water channels 12a and 12a for allowing the cooling water to flow into the cooling water channel 12 from the lower surface of the cylinder head 2 for each cylinder.
In addition, the inflow water channels 12b and 12b are opened, and the cooling water flowing from the inflow water channels 12a and 12b flows through the cooling water channel 12 while the intake port portion 3 to which the intake valve 21 is fitted and the exhaust valve 22 are fitted. After cooling the exhaust port portion 4 and the combustion chamber 1a formed in the cylinder block 1 below the cylinder head 2, the cooling water is discharged from the cooling water outlet 12d. The cooling water passage 12 is also formed between each of the intake port portions 3/3, the exhaust port portions 4/4, and the injection valve hole portion 6, and the intake valve 21, the exhaust valve 22, the combustion chamber 1a, etc. Can be efficiently cooled.
The cooling water passage 12 is a range represented by dots in FIG. 1 and FIG. 3 described later.

The inflow water passages 12a and 12a are arranged on the intake port portion 3, the exhaust port portion 4 and the injection valve hole portion 6 on the side opposite to the exhaust manifold 5, and the inflow water passage 12b.
12b is arranged on the exhaust manifold 5 side of the intake port portion 3, the exhaust port portion 4, and the injection valve hole portion 6.

As shown in FIG. 3, in addition to the inflow water channels 12a and 12b, the inflow water channels 12c and 12d and the inflow water channels 12a and 12a arranged between the adjacent cylinders are provided in the cooling water channel 12.
An inflow water channel 12e arranged between them is provided. Further, the cooling water passage 12 of each cylinder is connected to the adjacent cylinder in the longitudinal direction of the cylinder head 2, but the rib 2b formed between the cylinders and the exhaust port arranged on the side opposite to the exhaust manifold 5 are connected. A water flow blocking rib 2 a that blocks the cooling water channel 12 is formed between the part 4 and the part 4.

The cooling water flowing from the inflow water passages 12a, 12a into the cooling water passage 12 on the side opposite to the exhaust manifold 5 is distributed between the intake port portions 3 and 3 and between the intake port portion 3 and the exhaust port portion 4 in the same cylinder. In the meantime, it passes between the intake port portion 3 and the exhaust port portion 4 and the fuel injection valve hole portion 6, and flows into the cooling water passage 12 on the exhaust manifold 5 side. In this case, since the water flow blocking rib 2a is formed between the intake port portion 3 and the exhaust port portion 4 (the portion where the inflow water passages 12c and 12d are formed) between the adjacent cylinders, the cooling water does not flow. .

However, if the water flow blocking rib 2a is not formed, the intake port portion 3
3 and between the intake port portion 3 and the exhaust port portion 4, and between the intake port portion 3 and the exhaust port portion 4 and the fuel injection hole portion 6, the cooling water is mostly between them. Without passing through the ribs 2b and between the ribs 2b and the portion where the exhaust port 4 on the side opposite to the exhaust manifold 5 is formed, flows out into the cooling water passage 12 on the side of the exhaust manifold 5, and then the intake port 3 and the exhaust port 4 are formed. Cannot be sufficiently cooled.

That is, the water flow blocking rib 2a is provided in the inflow water channel 12
The cooling water that has flowed into the cooling water passage 12 from the a. 12a is prevented from passing between the rib 2b and the portion where the exhaust port portion 4 on the side opposite to the exhaust manifold 5 is formed, and the intake port portion in the same cylinder is prevented. The cooling water is forcibly passed between 3 and 3, between the intake port portion 3 and the exhaust port portion 4, between the intake port portion 3 and the exhaust port portion 4 and the fuel injection valve hole portion 6, for cooling. Is to do.

As described above, by forming the water flow blocking rib 2a, the direction of the water flow of the cooling water is adjusted so that the cooling water always passes through each of the intake port portions 3 and the exhaust port portions 4 and sufficient cooling is achieved. Therefore, the cooling efficiency of the engine can be improved. Further, according to this configuration, it is not necessary to form an inter-valve jet part for ejecting a jet flow between the intake port part and the exhaust port part as in the conventional case, and the cooling efficiency is improved with a simple structure. be able to. Therefore, the number of working steps can be reduced and the casting can be simplified to reduce the cost, and the flexibility of the design of the combustion system such as the layout of the intake / exhaust port parts 3 and 4, the valve diameter, etc. can be increased, and the optimum design for combustion can be achieved. It is possible to improve the durability and increase the output.

As described above, in order to reliably flow the cooling water flowing from the inflow water passages 12a, 12a arranged on the side opposite to the exhaust manifold 5 to the exhaust manifold 5 side through the intake port portion and the exhaust port portion, It is preferable that the amount of cooling water flowing from the inflow water channels 12a and 12a be larger than the amount of cooling water flowing from the inflow water channels 12b and 12b arranged on the manifold 5 side. Further, the engine of this example is configured with 6 cylinders, and the inflow water channel 12a and the inflow water channel 12b are provided in two places in each cylinder. The flow velocity of the cooling water that has flowed into the cooling water passage 12 from the inflow water passages 12a, 12b, etc. varies depending on the position of the cylinder head 2 in the longitudinal direction. That is, the flow velocity of the cooling water is high on the side of the cooling water outlet 12d and the cooling effect is high, and the velocity of the flow is slow on the end portion on the side of the anti-cooling water outlet 12d, which tends to stagnate and the cooling effect is low. Therefore, in the engine of the present invention, the inflow channel 12
The amounts of cooling water flowing in from a and 12b are made different between the exhaust manifold 5 side and the counter exhaust manifold 5 side, and between the cooling water outlet 12d side and the counter cooling water outlet 12d side.

That is, as shown in FIG. 4, in the gasket 25 interposed between the cylinder head 2 and the cylinder block 1, water flow restricting holes are provided at locations corresponding to the positions where the respective inflow water passages 12a and 12b are formed. 25a / 25b / 25c
・ 25d is formed. Further, each cylinder of the present engine has a first cylinder C1, a second cylinder C2, a third cylinder C3, a fourth cylinder C4, a fifth cylinder C in order from the cooling water outlet 12d side.
5 and a sixth cylinder C6 are arranged.

The water flow restriction hole 25b is provided at a location corresponding to the inflow water passage 12a of the first cylinder C1 and the second cylinder C2.
However, at the location corresponding to the inflow channel 12b, the water flow regulation hole 25
a is arranged, a water flow regulation hole 25c is arranged at a portion corresponding to the inflow water passage 12a of the third cylinder C3 and the fourth cylinder C4, and a water flow regulation hole 25b is arranged at a portion corresponding to the inflow water passage 12b. Inflow channel 12a of C5 and sixth cylinder C6
25d is provided at the location corresponding to
A water flow restriction hole 25c is arranged at a location corresponding to b.

Water flow restricting holes 25a, 25b, 25c, 25
The d has a larger diameter in the order of the water flow regulation hole 25a, the water flow regulation hole 25b, the water flow regulation hole 25c, and the water flow regulation hole 25d, and the water flow regulation holes 25a, 25b, 25c, 2 are formed.
The hole diameter of 5d is formed smaller than the diameter of the inflow water channels 12a and 12b. That is, the water flow regulation holes 25a, 25b, 2
The diameters of the inflow water channels 12a and 12b are reduced by 5c and 25d to control the amount of cooling water flowing into the cooling water channel 12 from the inflow water channels 12a and 12b.

The water flow restricting holes 25a, 25b
Due to the arrangement of 25c and 25d, each cylinder C3, C4 ...
The diameter of the water flow restricting hole arranged at the corresponding position of the inflow water channel 12a is larger than the diameter of the water flow restricting hole arranged at the corresponding position of the inflow water channel 12b. The amount of cooling water flowing into
The amount of cooling water flowing into the cooling water passage 12 from the inflow water passage 12b is larger than the amount of cooling water. That is, the water flow restriction holes 25a, 25b, 25c formed in the gasket 25.
-Inflow water channels 12a and 12 of the cooling water channel 12 by 25d
The channel area of b is regulated so that the channel area of the inflow channel 12a on the side opposite to the exhaust manifold 5 is larger than the channel area of the channel 12b on the exhaust manifold 5 side.

As a result, the cooling water flowing into the cooling water passage 12 from the inflow water passage 12a on the side opposite to the exhaust manifold 5 is
It becomes easier to flow to the exhaust manifold 5 side of the cylinder head 2 after passing through the intake / exhaust port sections 3 and 4, and the cooling water passage amount of the intake / exhaust port sections 3 and 4 can be increased, so that the cooling efficiency is improved. It becomes possible. Further, the adjustment of the diameters of the inflow water passages 12a and 12b for controlling the flow of the cooling water from the side opposite to the exhaust manifold 5 side requires a large-scale change such as changing the specifications of the cylinder block 2. It is possible to realize this by simply changing the specifications by simply changing the diameters of the water flow restricting holes 25a, 25b, 25c, 25d of the gasket 25. Further, when constructing an engine having specifications such as different output settings, the water flow restriction holes 25a, 25 of the gasket 25 are classified according to specifications.
The optimum cooling effect can be given to each engine with a simple specification setting by simply setting the diameters of b, 25c, and 25d.

Further, the water flow restricting holes 25a, 25b, 25c
Comparing the size of the hole diameter of 25d in the longitudinal direction of the cylinder head 2, the water flow restricting holes 25b, 25c, 25d provided at the locations corresponding to the inflow water passage 12a,
And the water flow restricting holes 25a, 25b, 25c provided at locations corresponding to the inflow water passage 12b are arranged such that the hole diameter on the anti-cooling water outlet 12d side is larger than the hole diameter on the cooling water outlet 12d side. There is. That is, the water flow restriction holes 25a, 25b, 25c, and 25d formed in the gasket 25 restrict the water channel area of the inflow water channels 12a and 12b of the cooling water channel 12, and the inflow water channel 12a on the anti-cooling water outlet 12d side.
The water channel area of 12b is configured to be larger than the water channel areas of the inflow water channels 12a and 12b on the cooling water outlet 12d side.

Therefore, the amount of cooling water flowing in from the inflow water channels 12a and 12b located on the side opposite to the cooling water outlet 12d is
It is possible to improve the flow of the cooling water in the cooling water passage 12 on the anti-cooling water outlet 12d side, which has a larger flow rate than the cooling water outlet 12d side and has a slow flow rate and tends to stagnate. Thereby, the flow velocity in the cooling water passage 12 on the anti-cooling water outlet 12d side can be made equal to the flow velocity in the cooling water passage 12 on the cooling water outlet 12d side, and each cylinder C1, C2 ,.
..It becomes possible to make uniform the flow velocity of the cooling water in the part. Then, the heat balance in the cylinder head 2 can be made uniform as a whole, local heating can be prevented, and defects such as cracks in the cylinder head 2 can be prevented.

[0027]

Since the present invention is constructed as described above, it has the following effects. That is, as described in claim 1, in an engine cooling device constituted by a cooling water passage provided around a combustion chamber, a partition wall is provided between adjacent cylinders of a cooling water passage on the side of an exhaust gas manifold of a cylinder head, and cooling is performed by the partition wall. Since the water flow is adjusted, the direction of the cooling water flow can be adjusted to improve the cooling efficiency of the engine. Further, it is not necessary to form the inter-valve jet section as in the conventional case, and the cooling efficiency can be improved with a simple configuration. Therefore, the number of working steps can be reduced and the casting can be simplified and the cost can be reduced, the degree of freedom in designing the combustion system can be increased, and the durability and the output can be improved.

Further, in the engine cooling device constituted by the cooling water passages provided around the combustion chamber as described in claim 2, the inflow water passage area of the cooling water passage on the side opposite to the exhaust manifold of the cylinder head is cooled by the cooling air on the exhaust manifold side. Since the regulating member that makes the area of the inflow passage of the water passage larger than that of the inflow passage is provided between the cylinder head and the cylinder block, the cooling water that has flowed into the cooling water passage on the side opposite to the exhaust manifold passes through the intake / exhaust port portion and the exhaust manifold. It becomes easier to flow to the side, and cooling efficiency can be improved. In addition, adjusting the diameter of the inflow water channel to control the flow of cooling water does not require major changes such as changing the specifications of the cylinder block, but it is possible to change the specifications simply by changing the restriction members such as gaskets. It can be realized. Further, when configuring an engine with specifications such as different output settings, the optimum cooling effect can be given to each engine with a simple specification setting in which the restriction member is simply changed according to the engine specifications.

Further, as described in claim 3, the regulation is performed so that the inflow channel area on the side opposite to the cooling water outlet in the cooling channel disposed in each cylinder is larger than the inflow channel area on the cooling water outlet side. Since the member is provided between the cylinder head and the cylinder block, the flow velocity of the cooling water in the cooling water passage on the anti-cooling water outlet side should be equal to the flow velocity in the cooling water passage on the cooling water outlet side. Therefore, the flow velocity of the cooling water in each cylinder can be made uniform. As a result, the heat balance in the cylinder head can be made uniform overall, local heating can be prevented, and problems such as cracks in the cylinder head can be prevented.

Further, in the engine cooling device constituted by the cooling water passage provided around the combustion chamber as described in claim 4, a partition wall is provided between adjacent cylinders of the cooling water passage on the side opposite to the exhaust manifold of the cylinder head, Since the inflow channel area of the exhaust manifold side cooling water channel is larger than the inflow channel area of the exhaust manifold side cooling water channel, it is possible to adjust the direction of the cooling water flow with a simple structure. The cooling water can be efficiently supplied to the intake / exhaust port portion, and the cooling efficiency can be improved.

Further, in the engine cooling device constituted by the cooling water passages provided around the combustion chamber as described in claim 5, a partition wall is provided between adjacent cylinders of the cooling water passage on the side opposite to the exhaust manifold of the cylinder head. The inflow channel area on the anti-cooling water outlet side of the cooling water channel arranged in the cylinder is
Since it is larger than the inflow channel area on the cooling water outlet side, the flow velocity of the cooling water in each cylinder part in the cylinder head can be made uniform, and the cooling water on the anti-exhaust manifold side can be efficiently absorbed and exhausted. It can be supplied to the port portion, and efficient cooling can be performed to uniformize the heat balance in the cylinder head as a whole.

Further, in the engine cooling device constituted by the cooling water passages provided around the combustion chamber as described in claim 6, the inflow water passage area of the anti-exhaust manifold side cooling water passage is changed to the exhaust manifold side cooling water passage. In addition to making it larger than the water channel area, the inflow channel area on the anti-cooling water outlet side of the cooling water channel arranged in each cylinder was made larger than the inflow channel area on the cooling water outlet side. Is efficiently supplied to the intake / exhaust ports, the cooling water flow rate in each cylinder part in the cylinder head can be made uniform, and efficient cooling is performed, while the heat balance in the cylinder head is maintained as a whole. Can be uniformly homogenized.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a cylinder head of an engine including a cooling device of the present invention.

FIG. 2 is a side sectional view of the same.

FIG. 3 is an enlarged plan sectional view showing an intake / exhaust port portion in the cylinder head.

FIG. 4 is a plan view showing a gasket.

FIG. 5 is a plan sectional view showing a conventional cooling device.

[Explanation of symbols]

1 cylinder block 2 cylinder head 2a partition 3 Intake port 4 Exhaust port section 5 exhaust manifold 12 Cooling channel 12a ・ 12b Inflow channel 12d Cooling water outlet 25 gasket 25a ・ 25b ・ 25c ・ 25d Water flow control hole

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02F 1/10 F02F 1/10 B

Claims (6)

[Claims] 1. An engine cooling device comprising a cooling water passage provided around a combustion chamber, wherein a partition wall is provided between adjacent cylinders of a cooling water passage on the side opposite to an exhaust manifold of a cylinder head, and the partition wall controls the flow of cooling water. An engine cooling device characterized by performing 2. An engine cooling device comprising cooling water passages provided around a combustion chamber, wherein an inflow water passage area of an anti-exhaust manifold side cooling water passage of a cylinder head is more than an inflow water passage area of an exhaust manifold side cooling water passage. A cooling device for an engine, wherein a regulating member for enlarging is provided between the cylinder head and the cylinder block. 3. A cylinder head and a cylinder, which are regulating members for regulating the inflow water passage area on the side opposite to the cooling water outlet of the cooling water passage arranged in each cylinder to be larger than the area of the inflow water passage on the cooling water outlet side. 3. The engine cooling device according to claim 1, wherein the cooling device is provided between the block and the block. 4. An engine cooling device comprising a cooling water passage provided around a combustion chamber, wherein a partition wall is provided between adjacent cylinders of an anti-exhaust manifold side cooling water passage of a cylinder head, and an inflow of the anti-exhaust manifold side cooling water passage is provided. An engine cooling device characterized in that a water channel area is made larger than an inflow water channel area of an exhaust manifold side cooling water channel. 5. A cooling device for an engine, comprising cooling water passages provided around a combustion chamber, wherein a partition wall is provided between adjacent cylinders of an anti-exhaust manifold side cooling water passage of a cylinder head, and cooling is provided in each cylinder. An engine cooling device, characterized in that an inflow channel area on an anti-cooling water outlet side of a water channel is made larger than an inflow channel area on a cooling water outlet side. 6. An engine cooling device comprising a cooling water passage provided around a combustion chamber, wherein an inflow water passage area of an anti-exhaust manifold side cooling water passage is made larger than an inflow water passage area of an exhaust manifold side cooling water passage. A cooling device for an engine, wherein an inflow channel area on an anti-cooling water outlet side of a cooling water channel arranged in each cylinder is larger than an inflow channel area on a cooling water outlet side.