JPH04116665U - Oil-cooled engine injection nozzle cooling system - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to prevent scuffing and welding from occurring on the sheet surface of the nozzle tip by efficiently cooling the injection nozzle with cooling oil. [Structure] The surroundings of the cylinder 4 are cooled by the cooling oil flowing in the cooling jacket 6 formed in the cylinder block 1, and the injection nozzle is cooled by the cooling oil flowing in the cooling jacket 8 formed in the cylinder head 2. In an oil-cooled engine that cools the area around the cylinder head 2, a passage 10 leading to the injection nozzle 3 is provided at the bottom of the cylinder head 2.
The cooling oil that cooled the cylinder 4 is passed through this passage 10.
This system cools the injection nozzle 3 by directing the jet toward the injection nozzle 3 more efficiently.In particular, the lower part of the injection nozzle can be efficiently cooled, which prevents scuffing and welding from occurring on the sheet surface of the nozzle tip. can be reliably prevented.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on the injection nozzle of an oil-cooled engine that uses cooling oil to cool each part of the engine. related to cooling equipment.

0002

[Conventional technology]

Conventionally, the fuel injection nozzle installed in diesel engines is located at the lowest point in the combustion chamber. Various cooling measures have been taken to deal with the heat from the high-temperature upper layers. For example, actual development Publication No. 59-81774, etc. The one described in the above publication has a nozzle tube b around the nozzle a as shown in Figure 2. is provided to efficiently cool the nozzle a.

0003

[Problem that the idea aims to solve]

However, although the above conventional cooling methods can be expected to be effective for water-cooled engines, In the case of oil-cooled engines where the cooling oil temperature is over 100℃, the oil protrudes into the combustion chamber. The temperature of the seat surface of the nozzle tip increases, causing scuffing and welding on the seat surface. There was a problem that a sufficient cooling effect could not be obtained due to the occurrence of cracks. This idea was made to improve the above-mentioned problems, and the injection nozzle was made more efficient. An attempt was made to provide an injection nozzle cooling device for an oil-cooled engine that allows for efficient cooling. It is something that

0004

[Means to solve the problem]

In order to achieve the above purpose, this idea has a cooling system formed inside the cylinder block. The cooling oil flowing inside the jacket cools the area around the cylinder, and The injection nozzle is cooled by the cooling oil flowing inside the cooling jacket formed inside the head. In an oil-cooled engine that cools the surrounding area, the bottom of the cylinder head A passage toward the injection nozzle is formed at the top of the cylinder, and the cooling oil that has cooled the cylinder is passed through this passage. A device that cools the injection nozzle by ejecting water toward the injection nozzle. It is.

[0005]

[Effect]

This invention is capable of efficiently cooling the lower part of the injection nozzle by the above-mentioned means. As a result, the temperature of the seat surface of the nozzle tip can be reduced to the same level as that of a water-cooled engine. becomes possible.

[0006]

【Example】

An embodiment of this invention will be described in detail with reference to the drawing shown in FIG. In Figure 1, 1 is the cylinder block, 2 is the cylinder head, and 3 is the injection nozzle. show. A plurality of cylinders 4 are formed within the cylinder block 1, and these cylinders are A piston 5 is housed in the cylinder 4, and cooling is provided around each cylinder 4. A jacket 6 is formed, and the cooling oil flowing inside this cooling jacket 6 As a result, the surroundings of the cylinder 4 are cooled. The injection nozzle 3 is provided for each cylinder 4, and the nozzle at the tip The nozzle 7 is protruded into the cylinder 4, and the area around the injection nozzle 3 is the cylinder. Cooled by cooling oil flowing through the cooling jacket 8 formed inside the head 2 It looks like this.

[0007] On the other hand, the upper part of the cooling jacket 6 provided in the cylinder block 1 and the cylinder A space between the cooling jackets 8 provided in the cylinder head 2 is formed at the bottom of the cylinder head 2. They are communicated by a passageway 10. The passage 10 has a plurality of passages along the bottom surface of the cylinder head 2 toward the injection nozzle 3. cooling oil flowing into the cooling jacket 6 in the cylinder block 1. flows into the passage 10 from the upper part of the cooling jacket 6.

[0008] Then, as it moves through the passage 10 toward the injection nozzle 3, it moves near the injection nozzle 3. An injection nozzle is ejected from an outlet 11 opening into the cooling jacket 8 in the cylinder head 2. The liquid is ejected along the outer peripheral surface of the tube 3. In the figure, 12 indicates a nozzle seat gasket, and 13 indicates an O-ring.

[0009] Next, the effect will be explained. During engine operation, water flows into the cooling jacket 6 in the cylinder block 1. The area around the cylinder 4 is cooled by the cooling oil. In addition, the cooling oil that has cooled the cylinder 4 is directed from the passage 10 to the injection nozzle 3, and the injection nozzle Jet is ejected into the cooling jacket 8 inside the cylinder head 2 along the outer peripheral surface of the cylinder 3. The jet nozzle 3 can be efficiently cooled by the jet flow.

0010

[Effect of the idea]

As detailed above, this idea is based on the fact that the bottom of the cylinder head has a passage toward the injection nozzle. A channel is formed and the cooling oil that cools the cylinder is injected as a jet stream from this channel. The injection nozzle is cooled by spraying water into the nozzle. Particularly the lower part of the nozzle can be efficiently cooled. This allows the nozzle to protrude into the cylinder and is most affected by the heat in the combustion chamber. Even though it is an oil-cooled engine, the temperature of the seat surface of the top is as high as that of a water-cooled engine. This reduces the risk of scuffing, welding, and other problems on the sheet surface. This can prevent the occurrence of defects that degrade engine performance, and improve injection It will also be possible to improve the reliability and durability of the nozzle. In addition, by adopting an oil-cooled engine, the injection nozzle that occurs in conventional water-cooled engines can be avoided. Corrosion and rust of the nozzle and nozzle holder can also be prevented.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an injection nozzle cooling device showing an embodiment of this invention.

FIG. 2 is a sectional view showing a conventional nozzle cooling device for a water-cooled engine.

[Explanation of symbols]

1 cylinder block 2 Cylinder head 3 Injection nozzle 4 cylinder 6 Cooling jacket 10 aisles

Claims (1)

[Scope of utility model registration request] Claim 1: The surroundings of the cylinder 4 are cooled by cooling oil flowing through a cooling jacket 6 formed inside the cylinder block 1, and cooling oil flowing inside a cooling jacket 8 formed inside the cylinder head 2 cools the surroundings of the cylinder 4. In an oil-cooled engine that cools the area around the injection nozzle 3, a passage 10 toward the injection nozzle 3 is formed at the bottom of the cylinder head 2, and the cooling oil that has cooled the cylinder 4 is sent from this passage 10 to the injection nozzle. By ejecting towards 3,
An injection nozzle cooling device for an oil-cooled engine, characterized in that the injection nozzle 3 is cooled.