JP2526038Y2 - Cylinder head cooling water passage structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooling water passage structure for a cylinder head in a multi-cylinder internal combustion engine, and more particularly to a cooling water passage structure with improved cooling performance.

[Related Art] Conventionally, various cooling water passage structures for improving the cooling performance of a cylinder head have been proposed.

For example, Japanese Patent Laying-Open No. 58-35221 discloses a structure having a first cooling system for sending cooling water to a portion other than near the squish area and a second cooling system for sending cooling water only to a portion near the squish area. Japanese Patent Application Publication No. 87-12661 discloses a structure in which a cylinder head cooling water passage is separated into an intake side and an exhaust side to enhance cooling on the intake side.

Japanese Patent Application Laid-Open No. Sho 60-43154 discloses a structure in which cooling water can flow in a direction perpendicular to the cylinder arrangement direction.

Further, in Japanese Patent Application Laid-Open No. 62-32265, for example, as shown in FIG. 3, independent cooling water passages 1 and 2 extending in the cylinder arrangement direction are provided on the intake side and the exhaust side, respectively. A structure is disclosed in which the cooling water that has passed through the cooling water passage 1 passes through the cooling water passage 3 extending in the cylinder arrangement direction in the central portion of each cylinder, and then is sent to the cooling water passage 2 on the exhaust side.

[Problems to be Solved by the Invention] However, as disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 58-35221 and Japanese Patent Publication No. 87-12661, merely providing the cooling water passage on the intake side as an independent cooling system, Since the cooling enhancement on the intake side cannot be said to be sufficient, and the squish area of the combustion chamber may be insufficiently cooled, it is difficult to say that the knocking suppression effect is sufficient.

Further, in the structure disclosed in Japanese Patent Application Laid-Open No. 60-43154, the cooling water flows from the exhaust side to the intake side. As a result, the cooling effect near the squish area is small.

Furthermore, in the structure disclosed in Japanese Patent Application Laid-Open No. 62-32265, in which the flow of cooling water in the cylinder head is entirely vertical flow (flow in the cylinder arrangement direction), the inter-cylinder portion of the independent cooling water passage 1 on the intake side, especially The portion 4 in FIG. 3 tends to be a stagnation portion of the cooling water, and there is a possibility that the cooling effect near the end of the squish area is insufficient. In addition, since the cooling water passage has a small flow passage area between the intake port 5 and the plug hole 6 or between the exhaust port 7 and the plug hole 6 in the central cooling water passage 3 (a cylinder head having a small valve angle is particularly small). However, it is difficult to secure a sufficient flow rate of the cooling water, and there is a possibility that the cooling of the central portion of the combustion chamber and the portion between the cylinders may be insufficient, which may cause a rise in the temperature of the end of the squish area. Insufficient cooling of the squish area causes knocking.

The present invention allows the intake side of the cylinder head, especially the squish area and its vicinity to be sufficiently cooled,
In addition to eliminating the possibility of knocking, ensure a sufficient flow rate of cooling water for cooling high-temperature areas between cylinders.
It is an object to efficiently and sufficiently cool the entire combustion chamber of each cylinder.

[Means for Solving the Problems] The cooling water passage structure of the cylinder head of the present invention that achieves the above object is as follows.

A cooling water passage structure provided in a cylinder head of a multi-cylinder internal combustion engine in which an intake valve and an exhaust valve are respectively arranged in a cylinder arrangement direction, and cooling water from a radiator is introduced into a lower portion of the cylinder head on an intake port side, An independent intake port-side cooling water passage that is separated from other cooling water passages by connecting between walls near the inlet of the intake port of the adjacent cylinder to the combustion chamber by a partition wall that extends in the cylinder arrangement direction. A cross-flow cooling water passage extending in a direction substantially perpendicular to the cylinder arrangement direction and extending in the cylinder arrangement direction and communicating with an exhaust port-side cooling water passage is provided between each cylinder in parallel with each other. A cooling water passage hole for guiding cooling water from the cylinder block side to the lateral cooling water passage is provided at a position near the partition wall of the lateral cooling water passage. .

[Operation] In the cooling water passage structure of the cylinder head of the present invention, the low-temperature cooling water from the radiator is first guided to the independent cooling water passage on the lower side of the cylinder head on the intake port side. Flows in the longitudinal direction in the cylinder arrangement direction to strongly cool the vicinity of the squish area of each cylinder.

Further, cooling water from the cylinder block side flows into the lateral flow cooling water passage through the cooling water passage hole from a position near the partition wall in the lateral flow cooling water passage between the cylinders, that is, a position corresponding to near the end of the squish area. Therefore, the end side of the squish area is also cooled strongly. Therefore,
The entire area of the squish area is effectively and strongly cooled.

Further, since the inter-cylinder flow is a lateral flow substantially perpendicular to the cylinder arrangement direction and is arranged in parallel with each other, the flow path length leading to the exhaust port-side cooling water passage is short, so that the flow resistance Is small. Further, since the cooling water passage holes are provided in all the lateral cooling water passages, the entire flow rate of the cooling water can be appropriately distributed. As a result, a sufficiently large cooling water flow rate is secured in the lateral cooling water passage, and in addition to sufficient cooling of the squish area, a high-temperature portion between cylinders is sufficiently cooled.

Furthermore, in the structure of the present invention, the cooling water flows in the order of the intake side, the position between the cylinders, and the exhaust side, and flows in order from the low-temperature part to the high-temperature part. The difference between the above and the above is always kept large, and effective cooling with good thermal efficiency can be performed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a cooling water passage structure of a cylinder head of a multi-cylinder internal combustion engine according to an embodiment of the present invention, and shows a case where the present invention is applied to a 4-cylinder 4-valve engine. In the figure, 11 indicates the entire cylinder head, 12 indicates an intake port, 13 indicates an intake valve hole, 14 indicates an exhaust port, 15 indicates an exhaust valve hole, and 16 indicates each cylinder or its combustion chamber. . As shown, the intake valve and the exhaust valve are respectively arranged in the cylinder arrangement direction.

A cooling water from a radiator 17 is introduced below the intake port 12, and an intake port-side cooling water passage 18 extending in the cylinder arrangement direction is provided. The intake port side cooling water passage 18 is an independent cooling water separated from the other cooling water passages by connecting the walls near the inlet of the intake port of the adjacent cylinder to the combustion chamber with a partition wall 19. The passage is configured. In the present embodiment, the partition wall 19 connects the intake port wall 20 and the cylinder head bolt boss portion 21 and further from the integral rib-shaped wall connected from the cylinder head bolt boss portion 21 to the intake port wall 20 of the adjacent cylinder. It is configured.

Between each cylinder, there is provided a transverse cooling water passage 23 extending substantially in a direction perpendicular to the cylinder arrangement direction and connected to an exhaust port side cooling water passage 22 extending in the cylinder arrangement direction at a downstream end. A similar lateral cooling water passage is provided outside the upstream end cylinder. The transverse cooling water passages 23 are parallel to each other. All transverse cooling water passages 23
A cooling water passage hole 26 for guiding the cooling water sent through the water pump 24 and the cylinder block 25 into the transverse cooling water passage 23 is provided at a position near the partition wall 19. Each cooling water passage hole 26 is formed to be smaller toward the upstream side and larger toward the downstream side when viewed in the direction of the flow of cooling water in the cylinder arrangement direction.

In the embodiment apparatus thus configured, the cooling water from the radiator 17 first flows into the independent intake port side cooling water passage 18, flows vertically in the cylinder arrangement direction, and then the water pump After cooling to the cylinder block 25, the coolant flows into the cooling water passage 23 through the cooling water passage hole 26 after flowing through the cooling water passage hole 26, and then flows vertically through the exhaust port side cooling water passage 22 after flowing through the passage. Is returned to the radiator 17.

The cooling water in the independent intake port side cooling water passage 18 has a low temperature and a sufficient flow rate, flows along the intake port wall 20 and the partition wall 19, and a portion corresponding to the central portion of the squish area has a low temperature from the radiator 17. Powerfully cooled by cooling water. Further, the cooling performance is further improved by the cooling water flow velocity increasing effect which is an advantage of the vertical flow.

Further, since the cooling water passage hole 26 for introducing the cooling water from the cylinder block side is provided in the vicinity of the partition wall 19, the cooling water flowing into the laterally flowing cooling water passage 23 firstly passes through the passage wall portion corresponding to the end of the squish area. 27 is efficiently and powerfully and reliably cooled. Further, since the transverse cooling water passage 23 has a short passage length and is provided between each cylinder and is arranged in parallel, the flow passage resistance to the entire flow of the cooling water is extremely small. Accordingly, a sufficiently large flow rate of the cooling water between the cylinders is ensured, and the high-temperature portion between the combustion chambers is sufficiently and effectively cooled.

Therefore, the vicinity of the end portion as well as the central portion of the squish area is sufficiently cooled, and the high temperature portion between the combustion chambers is also sufficiently cooled.

Further, the flow path of the entire cooling water flows from the independent cooling water passage 18 to the laterally flowing cooling water passage 23, further to the exhaust port-side cooling water passage 22, and from the low-temperature section to the high-temperature section. The rise can be effectively suppressed small, and the cooling efficiency for the entire cylinder head can be increased.

Further, in the present embodiment, the cooling water passage holes 26 are formed so as to increase in order toward the downstream side.
It is also possible to make the amount of cooling water flowing into the cylinder substantially uniform, and to make the cooling performance between the cylinders uniform.

Next, FIG. 2 shows a second embodiment of the present invention. In the present embodiment, the partition wall 31 is formed so as to protrude further to the exhaust side as compared with the first embodiment. Since other configurations are the same as those in the first embodiment, the description will be omitted by giving the same reference numerals as those in FIG. 1 to the portions corresponding to those in FIG.

As described above, the configuration of the partition wall 31 allows the intake port side independent cooling water passage 18 to project toward the center of the combustion chamber so that the squish area can be cooled more powerfully and extensively, and along the partition wall 31. The flow can be made smoother to more reliably prevent stagnation. Other operations are the same as in the first embodiment.

Although the above embodiment has been described with reference to a four-cylinder four-valve engine, it is needless to say that the present invention can be applied to other types of multi-cylinder engines.

[Effect of the Invention] According to the cooling water passage structure of the cylinder head of the present invention,
The intake port side of the combustion chamber can be strongly cooled by the intake port side cooling water passage independent of the other cooling water passages. In addition, the flow resistance can be reduced by flowing the cooling water flowing from the cooling water passage holes through the parallel horizontal flow cooling water passages, and the squish area end portion and the high temperature portion between the combustion chambers can be powerful with a sufficient amount of cooling water. Can be cooled.
As a result, the entire combustion chamber and particularly the squish area and the area between the cylinders can be sufficiently cooled, and the occurrence of knocking can be effectively suppressed.

Further, since the intake side is particularly efficiently and strongly cooled, the volumetric efficiency of the intake air can be improved.

In addition, by making the cooling water passages between cylinders parallel,
The cooling water flow path resistance can be reduced, the driving loss of the water pump can be reduced, and the fuel efficiency can be improved.

Further, since the partition wall defined by the intake port side cooling water passage also functions as a rib in structure, the rigidity of the entire cylinder head can be increased, and for example, reliability against water, oil, gas leakage, etc. from the head gasket portion can be improved. Properties can be further improved. In addition, since the rib is provided at the approximate center of the cylinder head, the required rigidity can be ensured even for the other parts of the cylinder head even if it is thin, and the weight and cost of the cylinder head can be reduced. Will be possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cylinder head showing a cooling water passage structure of a cylinder head according to a first embodiment of the present invention. FIG. 2 is a sectional view of a cooling water passage structure of a cylinder head according to a second embodiment of the present invention. FIG. 3 is a cross-sectional view of a cylinder head shown in FIG. 11 Cylinder head 12 Intake port 13 Intake valve hole 14 Exhaust port 16 Combustion chamber 17 Radiator 18 Cooling water passage on intake port side 19, 31 Partition wall 21 Cylinder Head bolt boss portion 22 Cooling water passage on exhaust port side 23 Cooling water passage 24 flowing laterally Water pump 25 Cylinder block 26 Cooling water passage hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Satoya 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Akira Kamoto 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Takusuke Shikita 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Co., Ltd. Kosho 57-58334 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A cooling water passage structure provided in a cylinder head of a multi-cylinder internal combustion engine in which an intake valve and an exhaust valve are respectively arranged in a cylinder arrangement direction, wherein cooling from a radiator is provided at a lower portion of the cylinder head on an intake port side. Water is introduced, extends in the cylinder arrangement direction, and is separated from other cooling water passages by connecting walls between the intake ports of the adjacent cylinders near the entrance to the combustion chamber with partition walls. A port-side cooling water passage is provided, and lateral cooling water passages extending in a direction substantially perpendicular to the cylinder arrangement direction and communicating with the exhaust port-side cooling water passages extending in the cylinder arrangement direction are provided in parallel between the cylinders. At the same time, a cooling water passage hole for guiding cooling water from the cylinder block side to the lateral cooling water passage is provided at a position near the partition wall of all the lateral flow cooling water passages. Cooling water passage structure of a cylinder head, characterized in that.