JPH07224651A - Cooling device of internal combustion engine - Google Patents

Abstract

PURPOSE:To regulate a flowing direction of cooling water without installing a paritioning wall or the like in a cooling water passage of a cylinder block. CONSTITUTION:A cooling water passage 26 is formed around a continuous cylinder bore wall 24 of a multiple siamese cylinder block 20, while a cooling water inlet part 28, making cooling water W flow into the cooling water passage 26 from a direction tangential to a curved surface 24a of the continuous cylinder bore wall 24 of a cylinder to be situated in an endmost part, is installed in this cylinder block 20, and a cooling water outlet part 30 being situated at a downstream end of the cooling water passage 26 and discharging the cooling water W in the passage 26, is installed in and around the cooling water inlet part 28 of the cylinder block 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a cylinder block of an internal combustion engine, and more particularly to a cooling device for an internal combustion engine in which the flow direction of the cooling water is regulated without providing a partition wall or the like in the cooling water passage. .

[0002]

2. Description of the Related Art In a multiple Siamese cylinder block, a partition wall is provided at the cooling water inlet to the cooling water passage to prevent the cooling water from flowing from the cooling water inlet to the cooling water outlet by short-circuiting. A cooling system structure that allows the water to flow in one direction from a water inlet to a cooling water outlet through a cooling water passage around the wall of a continuous cylinder bore is disclosed in Japanese Patent Laid-Open No. 4-214951.
It is disclosed in the publication.

FIG. 4 shows an example of a conventional cooling device for an internal combustion engine. In FIG. 4, reference numeral 2 denotes a cylinder block, and the cylinder block 2 has a plurality of cylinder bores 4 formed therein. A cooling water passage 8 is formed around the continuous cylinder bore wall 6 of the cylinder block 2. A cooling water inlet 10 for supplying the cooling water W to the cooling water passage 8 is provided at the end of the cylinder block 2. The cooling water passage 8 has a partition wall 1 for partitioning the cooling water passage 8.
2 is formed.

In the vicinity of the partition wall 12 of the cylinder block 2, a cooling water passage 8 flowing along the continuous cylinder bore wall 6 is provided.
A cooling water outlet 14 for discharging the cooling water W therein is provided. The cooling water W discharged from the cooling water outlet 14 is
It flows into a cooling water passage of a cylinder head (not shown) that is fastened to the cylinder block 2. The cooling water W that has cooled the cylinder block 2 is prevented from being recirculated in the cooling water passage 8 by the partition wall 12,
The cooling performance of the cylinder block 2 is enhanced.

[0005]

However, the cooling device for the internal combustion engine shown in FIG. 4 has the following problems. (1) When the partition wall 12 is cast integrally with the cylinder block 2, since the cylinder bore wall 6 and the outer wall of the cooling water passage 8 are connected, there is a problem that the roundness of the cylinder bore 4 deteriorates. Further, when the partition wall 12 is a casting, the casting work is complicated and the productivity is poor. (2) When the partition wall 12 is formed of a member different from the cylinder block 2, it is necessary to assemble the components in the cooling water passage, which is a cost problem. Further, in this case, it is difficult to completely partition the cooling water passage, and the flow of the cooling water cannot be reliably regulated as compared with the partition wall formed by casting. Also in the case of the structure of Japanese Patent Laid-Open No. 4-214951, the guide member is arranged in the cooling water passage, so that the same problem as in FIG. 4 occurs.

It is an object of the present invention to provide a cooling device for an internal combustion engine which can regulate the flow direction of cooling water without providing a partition wall or the like in the cooling water passage of the cylinder block.

[0007]

The cooling device for an internal combustion engine according to the present invention for achieving this object is configured as follows. (1) A cooling water passage is formed around a continuous cylinder bore wall of a multiple Siamese cylinder block, and the cooling water is provided in the cylinder block from a tangential direction with respect to a curved surface of the continuous cylinder bore wall of the cylinder located at the end. A cooling water inlet portion is provided to allow the cooling water to flow into the passage, and a cooling water outlet portion located at a downstream end of the cooling water passage near the cooling water inlet portion of the cylinder block for discharging the cooling water in the cooling water passage. An internal combustion engine cooling device comprising: (2) The cooling device for an internal combustion engine according to (1), wherein the cooling water outlet portion communicates with a cooling water passage of the cylinder head that is fastened to the cylinder block.

[0008]

In the cooling device for the internal combustion engine of the above (1),
Since the cylinder block is provided with a cooling water inlet portion that allows the cooling water to flow into the cooling water passage from the tangential direction with respect to the curved surface of the continuous cylinder bore wall of the cylinder located at the extreme end, the cooling water flows into the cooling water passage. The inflow resistance at the time of inflow is reduced, and a flow in one direction can be forcedly generated in the cooling water passage. By appropriately setting the area of the cooling water outlet located at the downstream end with respect to the area of the cooling water passage in the cylinder block, the cooling water is reliably discharged from the cooling water outlet. Therefore, it is possible to regulate the flow of the cooling water without providing a partition wall in the cooling water passage as in the conventional case. In the cooling device for an internal combustion engine according to (2) above,
Since the cooling water outlet part and the cooling water passage of the cylinder head are communicated with each other, the cooling water outlet part only needs to be opened on the fastening surface of the cylinder block to the cylinder head, and the fastening of the cylinder block and the cylinder head. This makes it possible to automatically connect the cooling water outlet and the cooling water passage of the cylinder head.

[0009]

1 to 3 show one embodiment of the present invention, particularly when applied to an in-line four-cylinder engine. As shown in FIG. 1, in the multiple Siamese cylinder block 20, a cooling water passage 26 is formed so as to surround the continuous cylinder bore wall 24. The cooling water passage 26 extends from one longitudinal end 22a of the cylinder block 20 along one side (intake manifold side) of the cylinder bore wall 24 to the other longitudinal end 22b of the cylinder block 20, and makes a U-turn there to make a continuous cylinder bore wall 24. Along the other side (exhaust manifold side) to the cylinder block longitudinal direction one end 22a.

At one end 22a of the cylinder block 22, cooling water is introduced into the cooling water passage 26 from a tangential direction or a direction close to the curved surface 24a of the continuous cylinder bore wall 24 of the first cylinder located at the outermost end. A cooling water inlet portion 28 for allowing W to flow in is provided. In this embodiment, the cooling water inlet portion 28 is formed parallel to the axis A passing through the center of each cylinder bore 21. The downstream end of the cooling water inlet 28 is
As shown in FIG. 2, the cooling water passage 26 is opened at approximately the center in the vertical direction. By disposing the cooling water inlet portion 28 with respect to the continuous cylinder bore wall 24 as described above, the inflow resistance when the cooling water W flows into the cooling water passage 26 is reduced, and the cooling water W in the cooling water passage 26 is reduced. It is possible to force a flow in a fixed direction.

At one end 22a of the cylinder block 26, the cooling water passage 26 is located at the downstream end of the cooling water passage 26.
A cooling water outlet portion 30 for discharging the cooling water W therein is provided. As shown in FIG. 2, the cooling water outlet portion 30 is open to a fastening surface 32 with which the cylinder head 40 is fastened. The cooling water outlet portion 30 communicates with a cooling water passage 42 of the cylinder head 40 that is fastened to the cylinder block 26. The cylinder block 26 and the cylinder head 40 are fastened via a gasket 44. A water hole 46 is formed in the gasket 44 to guide the cooling water W discharged from the cooling water outlet portion 30 to the cooling water passage 42 on the cylinder head 40 side.

The opening area of the cooling water outlet portion 30 on the fastening surface 32 side is set to have a passage resistance smaller than that of the longitudinal sectional area of the cooling water passage 26 shown in FIG. As a result, the cooling water W that makes a U-turn in the cooling water passage 26 is suppressed from flowing toward the cooling water inlet portion 28, and the circulation of the cooling water W in the cooling water passage 26 is prevented.

FIG. 3 shows the flow of cooling water in the entire engine. The water discharged from the radiator first flows through the intake side passage 48 of the cylinder head 40, is sucked into the water pump 50, and is supplied to the cylinder block 20. In the cylinder block 20, the cooling water passage 26 flows through the passage on the intake side from the first cylinder to the fourth cylinder, makes a U-turn around the fourth cylinder, and passes through the cooling water passage on the exhaust side. Then, the cooling water passage is set so as to return to the first cylinder, then rise to the cylinder head 40, flow around the plug of the cylinder head 40 and the passage on the exhaust side toward the fourth cylinder, and exit to the radiator side. .

Next, the operation of the above cooling device for an internal combustion engine will be described. The cooling water W pumped from the water pump 50 enters the cooling water passage 26 from the cooling water inlet portion 28 of the cylinder block 20. Cooling water inlet 2
8 is the curved surface 2 of the continuous cylinder bore wall 24 of the first cylinder.
Since the cooling water W is caused to flow into the cooling water passage 26 from the tangential direction to 4a or a direction close thereto, the inflow resistance (water passage resistance) when the cooling water W flows into the cooling water passage 26 is reduced. Is possible. As a result, the cooling water W in the cooling water passage 26 can be forcibly caused to flow in a certain direction, and the cooling water W makes a U-turn from the cooling water inlet 28 toward the cooling water outlet 30. Flowing.

While the cooling water W flows through the cooling water passage 26,
Due to heat exchange between the cooling water W and the continuous cylinder bore wall 24, the continuous cylinder bore wall 24 is sufficiently cooled. Further, since the inflow resistance when the cooling water W flows into the cooling water passage 26 is reduced, the flow rate of the cooling water W flowing through the cooling water passage 26 is increased and the cooling performance of the cylinder block 20 is improved.

The cooling water inlet portion 28 and the cooling water outlet portion 30 are
Although close to each other, the cooling water inlet portion 28 is connected to the cooling water passage 26.
Since the cooling water W flowing into the cooling water flows toward the No. 2 cylinder side, the cooling water W from the cooling water inlet portion 28 is
It does not flow directly to the 0 side. Further, the opening area of the cooling water outlet portion 30 on the fastening surface 32 side is set to have a passage resistance smaller than that of the longitudinal sectional area of the cooling water passage 26 shown in FIG. Part 30
The flow resistance of the cooling water W becomes small, and the cooling water W reaching the downstream end of the cooling water passage 26 smoothly flows into the cooling water passage 42 of the cylinder head 40 via the cooling water outlet portion 30.

[0017]

According to the present invention, the following effects can be obtained. (1) In the cooling device for an internal combustion engine according to claim 1, in the cylinder block, cooling water is introduced into the cooling water passage from a tangential direction to the curved surface of the continuous cylinder bore wall of the cylinder located at the most end. An inlet is provided, and a cooling water outlet located at the downstream end of the cooling water passage for discharging the cooling water in the cooling water passage is provided near the cooling water inlet of the cylinder block. The flow direction of the cooling water can be regulated without providing a wall or the like. Therefore, the structure of the cylinder block can be simplified, and the manufacturing cost of the cylinder block can be reduced. (2) In the cooling device for the internal combustion engine according to the second aspect, the cooling water outlet portion is made to communicate with the cooling water passage of the cylinder head. Therefore, the cooling water outlet portion is provided on the fastening surface of the cylinder block with the cylinder head. Only the opening is required, and the cooling water outlet and the cooling water passage of the cylinder head can be automatically connected by fastening the cylinder block and the cylinder head.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a cylinder block in a cooling device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a partial vertical sectional view of a cylinder block in the apparatus of FIG.

FIG. 3 is a cooling water path diagram of the apparatus of FIG.

FIG. 4 is a cross-sectional view of a cylinder block in a conventional cooling device for an internal combustion engine.

[Explanation of symbols]

 20 Cylinder Block 24 Continuous Cylinder Bore Wall 24a Curved Surface 26 Cooling Water Passage 28 Cooling Water Inlet 30 Cooling Water Outlet 40 Cylinder Head W Cooling Water

Claims (2)

[Claims] 1. A cooling water passage is formed around a continuous cylinder bore wall of a multiple Siamese cylinder block, and the cylinder block is tangential to a curved surface of the continuous cylinder bore wall of the cylinder located at the end. Cooling water is provided in the cooling water passage to allow the cooling water to flow into the cooling water passage, and the cooling water is located at the downstream end of the cooling water passage near the cooling water inlet portion of the cylinder block and discharges the cooling water in the cooling water passage. An internal-combustion-engine cooling device having an outlet. 2. The cooling device for an internal combustion engine according to claim 1, wherein the cooling water outlet portion communicates with a cooling water passage of a cylinder head that is fastened to the cylinder block.