JPH08296494A - Cooling device of cylinder block - Google Patents

Abstract

PURPOSE: To uniformize the temperature of a cylinder block by cooling the upper section of a cylinder liner, which has the highest temperature, by means of the jet stream from a housing, by press fitting plug members in the openings provided in the wall member of a water jacket and by integrally forming a pipe-like directional nozzle in this plug member. CONSTITUTION: A housing 2 for an oil cooler 10 is provided in the side face of a cylinder block 1, and a plurality of openings 4 for dropping the foundry sand stuck on the wall member 3 of the bottom section of the housing 2, and plugs 5 are press fitted in the openings 4. Ring-like directional nozzles 11 facing upward are integrally formed in the plugs 5 so that jet stream faces the upper section of a cylinder liner, and a holes 7 are provided in the nozzles 11. A plurality of sub-holes 12 are provided in addition to the hole 7. Jet stream is generated toward the external peripheral section of a cylinder liner 8 so that like the jet stream passing through the hole 7, the jet stream passing through the sub-holes also can cool over all of the high temperature portion of the upper section of the cylinder liner 8.

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, and more particularly to a device for cooling the outer peripheral portion of a cylinder liner of a multi-cylinder engine.

[0002]

2. Description of the Related Art FIG. 4 shows a storage chamber 2 for an oil cooler installed on a side surface of a cylinder block 1.
After the cylinder block 1 is cast, the wall member 3 of the storage chamber 2 has a plurality of openings 4 formed therein for removing casting sand adhering to the casting. Then, after the molding sand is dropped, a shallow cup-shaped plug 5 is press-fitted into each opening 4. FIG. 5 is a schematic cross-sectional view taken along the line AA of FIG. 4, in which a plug 5 is press-fitted into each opening 4 provided in the wall member 3 at the bottom of the storage chamber 2. The plugs 5 have openings 7 through which the inside of the storage chamber 2 and the inside of the water jacket 6 communicate. A plurality of cylinder liners 8 are incorporated in series in the cylinder block 1, and a water jacket 6 is formed on the outer peripheral portion of the liner 8.

Normally, a forced circulation system is used as a cooling system in the cylinder block 1. In this system, cooling water discharged by a water pump (not shown) is pressure-fed into the accommodation chamber 2 through the water supply passage 9, and then flows into the water jacket 6 through the passage 7. In addition, accommodation room 2
Since the position of the through hole 7 provided inside is below the upper surface of the cylinder block 1 and is provided at the same position as the intermediate position between the cylinder liners 8 adjacent to each other in the block 1,
The cooling water flow flowing into the water jacket 6 flows toward an intermediate position between the cylinder liners 8. A cooling method is used in which the cooling water that has cooled the outer peripheral portion of the cylinder liner 8 passes through the inside of a cylinder head (not shown) and returns to the suction port of the water pump again.

[0004]

The above-mentioned conventional techniques have the following problems. Since the cooling water flow that has flowed into the water jacket through the through-hole in the storage chamber is configured so that the intermediate position between the adjacent cylinder liners is the directing direction, it is present in, for example, an in-line four-cylinder engine as shown in FIG. Then, the flow of the cooling water to the outer peripheral portions of the # 1 cylinder liner and the # 4 cylinder liner becomes poor, and the cooling water in this portion is likely to stagnate. Further, the flow of the cooling water in the left-right direction immediately after flowing into the water jacket through the passage becomes poor, and the cooling water at this portion also easily stagnates. Furthermore, since the direction of the jet flow is below the upper portion of the cylinder liner, the flow of cooling water toward the outer peripheral portion of the upper portion of the cylinder liner, where the temperature rises, also deteriorates. In this way, if the distribution of the cooling water flow in the outer peripheral portion of the cylinder liner is uneven, the temperature of the cylinder liner,
Especially, the temperature at the upper part of the cylinder liner becomes non-uniform. As a result, fuel consumption and output performance are reduced, thermal distortion occurs in the cylinder bore, cylinder deformation in multi-cylinder engines, and heat spots occur in the upper part of the cylinder liner, which may cause abnormal combustion. It may lead to many ripple problems such as increased consumption of lubricating oil. It should be noted that Japanese Utility Model Publication No. 60-40840 discloses that a cooling water conduit is opened to give directivity to a jet of cooling water, but the wall thickness of the cooling water conduit alone is sufficient. It is difficult to secure sex. The same applies to Japanese Utility Model Laid-Open No. 38017/1990. The present invention aims to solve these conventional problems.

[0005]

In order to achieve the above-mentioned object, according to the present invention, a plug member is press-fitted into an opening provided in a wall member of a water jacket, and a tubular directional nozzle is integrally formed in the plug member. As it is formed, the jet acts to even out the cooling of the cylinder liner.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. In general, when the accommodation chamber of the oil cooler is installed on the side surface of the cylinder block, it is installed below the upper surface of the cylinder block for the convenience of layout. For this reason, it becomes difficult to directly provide the opening of the accommodation chamber in the vicinity of the upper portion of the cylinder liner where the temperature of the cylinder liner is highest. on the other hand,
In the water-cooled cylinder block, the distribution of the cooling water flow in the water jacket is made uniform to eliminate the unevenness of the temperature of the cylinder liner, especially the temperature of the upper part of the cylinder liner, and prevent many ripple problems. Is an important issue. In addition, since the top surface of the piston occupies a considerable area of the wall surface of the combustion chamber, the heat load that it receives is high, and the heat of this surface is mainly radiated to the cylinder bore from the piston ring that is in contact with the cylinder bore. The temperature is the highest. Therefore, it is necessary to uniformly cool the temperature of this portion to lower the temperature.

Since the engine of the embodiment of the present invention is equipped with an oil cooler, an example has been shown in which the cooling water flows into the water jacket from the oil cooler housing chamber, but the oil cooler is not always necessary. A storage chamber 2 of the oil cooler 10 is installed on the side surface of the cylinder block 1, and a plurality of openings 4 for dropping casting sand adhering to the casting are provided in a wall member 3 at the bottom of the storage chamber 2, and a plug 5 is provided in each opening 4. Pressing in is the same as the conventional technique. In the present invention, as shown in FIG. 1, an upward tubular directing nozzle 11 is integrally formed with the plug 5 so that the jet flow is directed to the upper part of the cylinder liner, and the nozzle 11 is provided with a through hole 7 and a through hole 7. Separately, a plurality of sub passages 12 are further provided. Then, similarly to the jet flow from the through-hole 7, the jet flow from the sub-jet port 12 also generates a jet flow toward the outer peripheral portion of the cylinder liner 8 so as to cool the entire high temperature portion of the upper portion of the cylinder liner 8. Depending on the cylinder liner 8, there is also a portion with a different temperature difference in the upper portion of the liner 8, but if the temperature difference is small, the cylinder liner with a high temperature will be considered in consideration of the versatility and economy of the plug 5. The direction of the passage 7 and the sub passage 12 is determined so that the vicinity of 8 is cooled. The other configurations are the same as those of the conventional technique, and thus the description thereof is omitted here.

[0008]

Since the present invention is configured as described above, it has the following effects. A cylinder-shaped directing nozzle that faces upwards is integrally formed on the plug so that the jet flow is directed to the upper part of the cylinder liner.The nozzle has a through hole and multiple sub-through holes, and the jet line from the storage chamber has the highest temperature. Since the upper part is cooled, the temperature of the same portion can be made uniform. In addition, the flow of cooling water in multiple directions due to the jet flow improves the distribution of the flow in the outer peripheral portion of the cylinder liner, and it is possible to eliminate the stagnant portion of the cooling water in the outer peripheral portion of the cylinder liner. There is an effect that the temperature can be made uniform. By improving the flow distribution of the cooling water in the cylinder block, the temperature of the outer peripheral part of the cylinder liner becomes uniform, which improves fuel efficiency and output performance and prevents the occurrence of heat distortion and heat spots in the cylinder bore. It is possible to obtain effects such as reduction of consumption.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG. 4 showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the BB line plug of FIG.

FIG. 3 is a front view of FIG.

FIG. 4 is a perspective view of a side surface of a cylinder block.

FIG. 5 is a cross-sectional view taken along line AA of FIG. 4 showing a conventional technique.

[Explanation of symbols]

 1 Cylinder Block 3 Wall Member 4 Opening 5 Plug Member (Plug) 6 Water Jacket 11 Directional Nozzle

Claims (1)

[Claims] 1. A cooling device for a cylinder block, wherein a plug member is press-fitted into an opening provided in a wall member of a water jacket, and a tubular directional nozzle is formed integrally with the plug member.