JPH04119346U - internal combustion engine cylinder head - Google Patents

Abstract

(57) [Summary] [Configuration] Inside the cylinder head 1 are intake and exhaust ports 6,
7 and a cooling water jacket 8. A cooling groove 18 is formed within the jacket 8 along the valve seat of the exhaust valve 10. The cooling groove 18 is arranged downstream of the inlet 15a' that introduces the cooling water into the jacket 8 so that the cooling water can be forced to flow into the cooling groove 18. [Effect] Inside the cylinder head 1, the part along the valve seat of the exhaust valve 10, which has a large thermal load, can be effectively cooled, preventing valve seat wear and cracking in the cylinder head 1, Durability can be improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a cylinder head of an internal combustion engine, and the present invention relates to a cooling method for the inside of the cylinder head. This is intended to improve cooling efficiency using a water jacket.

0002

[Conventional technology]

Inside the cylinder head 101 of the internal combustion engine shown in FIGS. 4 and 5, there are intake ports. 102, an exhaust port 103, and a cooling water jacket 104. the Cooling water is forced between the intake valve 105 and the exhaust valve 106 inside the jacket 104. Cooling water is introduced into the jacket 104 between the intake and exhaust valves so that cooling water can flow. It is arranged downstream of the inlet 107 where the

0003 This effectively cools the intake and exhaust valves, which have a large heat load, and also The area around the lug 108 is effectively cooled and cracks are prevented from forming in that area. There is.

0004

[Problem that the idea aims to solve]

In the cylinder head, along the valve seat of the exhaust valve that is exposed to high temperature exhaust gas. However, the conventional cooling structure of the cylinder head 101 described above , the part along the valve seat of the exhaust valve cannot be cooled sufficiently, causing valve seat wear and valve seat damage. This was causing cracks to occur nearby.

[0005] The present invention is a cylinder head for an internal combustion engine that can solve the problems of the prior art described above. The purpose is to provide a

[0006]

[Means to solve the problem]

The feature of the first invention is that there are intake and exhaust ports inside the cylinder head. In an internal combustion engine equipped with a cooling water jacket, the valve seat of the exhaust valve is A cooling groove is formed along the The cooling groove is located downstream of the inlet that introduces cooling water into the jacket. It is in the point where it is.

[0007] The second invention is characterized by the intake and exhaust ports inside the cylinder head. In an internal combustion engine equipped with a cooling water jacket, the valve seat of the exhaust valve is The part along the valve seat is , located downstream of the first inlet that introduces cooling water into the jacket, and inside the jacket. In order to force cooling water to flow between the intake and exhaust valves, the space between the intake and exhaust valves is It is located downstream of the second inlet that introduces cooling water into the jacket. this In this case, a cooling groove is formed in the jacket along the valve seat of the exhaust valve, and this cooling groove The cooling groove is located downstream of the first inlet so that the cooling water can be forced to flow into the It is preferable that the

[0008]

[Effect]

According to the configuration of the first invention, the cooling water is introduced into the inside of the jacket from the inlet. The cooling water flows through the cooling groove formed along the valve seat of the exhaust valve. The area along the valve seat of the exhaust valve, which has a large heat load, is effectively cooled.

[0009] According to the configuration of the second invention, the cooling water is introduced into the inside of the jacket from the first inlet. Since the cooled water flows toward the part along the valve seat of the exhaust valve, the heat load is large. The area along the valve seat of the exhaust valve is effectively cooled. Also, check the inside of the cooling water jacket. The cooling water introduced from the second inlet into the The areas between the intake and exhaust valves, which have a large load, are effectively cooled. In this case, introduce from the first introduction port. The cooled water flows through the cooling groove formed along the valve seat of the exhaust valve. , the cooling effect of the portion along the valve seat of the exhaust valve can be further enhanced.

0010

【Example】

Embodiments of the present invention will be described below with reference to the drawings.

[0011] 1 to 3 show a cylinder head 1 of a multi-cylinder gas engine. The head 1 is attached to the upper part of the cylinder block 2 with bolts 3. So A piston 4 and a cooling water jacket 5 are formed inside the cylinder block 2. Ru. Inside the cylinder head 1 are an intake port 6, an exhaust port 7, and a cooling water jacket. 8. At the top of the cylinder head 1 are an intake valve 9 and an exhaust valve 10. A valve mechanism 11 is provided for operating the valve. Cover this valve mechanism 11 A cover 12 is attached to the cylinder head 1. Valve pusher of the valve mechanism 11 The rod 13 passes through the cylinder head 1 and cylinder block 2. . Furthermore, a spark plug 14 is inserted into the cylinder head 1 . In addition, In this example, a gas engine is shown, but in the case of a diesel engine, the spark plug Instead, a fuel injection nozzle is placed at this spark plug location.

0012 The cooling water jacket 5 inside the cylinder block 2 and the cooling water inside the cylinder head 1 It communicates with the cooling water jacket 8 via a cooling water passage 15 . This cooling water passage 15 The thick part of the cylinder head 1 is divided into a first passage 15a and a second passage 15b. branch out The first passage 15a and the second passage 15b are a thick wall portion of the cylinder head 1. A through hole is provided in the cylinder head 1, and the pipe inserted into the cylinder head 1 is inserted into the middle part of the through hole. It is formed by closing with a shaped plug 16. In addition, in that plug 16 The bolt 3 is inserted.

[0013] A cooling water jacket 5 inside the cylinder block 2 is connected to a pump and Connected to a radiator (not shown). As shown by the arrow in the figure, the cooling water is Cooling water is introduced from the radiator into the cooling water jacket 5 in the cylinder block 2 by the pump. After that, the cooling water is introduced into the cooling water jacket 8 of the cylinder head 1 through the cooling water passage 15. After that, it flows back into the radiator from an outlet (not shown).

[0014] That is, the cooling water jacket 8 of the cylinder head 1 is provided with the cooling water passage 15. Cooling water is introduced through the first passage 15a and the second passage 15b, and the cooling water in the first passage 15a is The cooling water outlet is the first introduction port 15a', and the cooling water outlet of the second passage 15b is the second introduction port 15a'. The opening 15b'.

[0015] A portion of the exhaust valve 10 along the valve seat 17 is disposed downstream of the first inlet port 15a'. between the intake valve 9 and the exhaust valve 10 is arranged downstream of the second inlet port 15b'. has been done.

[0016] Then, inside the cooling water jacket 8, in a portion along the valve seat 17 of the exhaust valve 10, A first cooling groove 18 and a second cooling groove 19 are formed. The first cooling groove 18 is It is arranged downstream of the first introduction port 15a'. In addition, the first inlet port 15a' The upper part between the first cooling groove 18 and the exhaust port 7 is covered by the outer wall 1a of the exhaust port 7, and this outer wall The lower surface of 1a is directed downward as it approaches the first cooling groove 18 from the first inlet 15a'. The guide surface 20 is inclined.

[0017] According to the above configuration, the first inlet 15 is connected to the cooling water jacket 8 of the cylinder head 1. The cooling water introduced from a' flows toward the part along the valve seat 17 of the exhaust valve 10. Therefore, it is possible to effectively cool the portion of the exhaust valve 10 along the valve seat 17 that has a large heat load. I can do that. In addition, the inside of the first cooling groove 18 formed in the part along the valve seat 17, Since the cooling water introduced from the first inlet port 15a' flows, the cooling water flows along the valve seat 17. It is possible to cool the parts more effectively. At this time, the guide surface 20 In order to guide the cooling water from the inlet 15a' to the first cooling groove 18, the first cooling water can be guided more reliably. Cooling water flows within the cooling groove 18 .

[0018] Also, the cooling water is introduced into the cooling water jacket 8 of the cylinder head 1 from the second introduction port 15b'. The cooled water flows between the intake and exhaust valves, which has a large heat load. can be effectively cooled. Furthermore, the ignition plug is located downstream between the intake and exhaust valves. Since the spark plug 14 is arranged, the area around the spark plug 14 can also be effectively cooled. can be done.

[0019] By adopting the above configuration, compared to the configuration shown in the conventional example, the exhaust valve temperature is reduced by 3. It was confirmed that the temperature was reduced by 0°C to 40°C.

[0020] Note that the present invention is not limited to the above embodiments. For example, in the above example applied this invention to a gas engine, but it is not applicable to diesel engines or gasoline engines. The present invention can also be applied to.

[0021]

[Effect of the idea]

According to each of the inventions, the exhaust valve, which has a large heat load, is installed inside the cylinder head. The area along the valve seat can be effectively cooled, reducing valve seat wear and cooling the area around the valve seat. It is possible to prevent the occurrence of cracks and improve durability.

[Brief explanation of drawings]

[Fig. 1] Cross-sectional view of a cylinder head according to an embodiment of the present invention

[Figure 2] Cross-sectional view taken along the line II-II in Figure 1

[Figure 3] Cross-sectional view taken along line III-III in Figure 1

[Fig. 4] Planar sectional view of a cylinder head according to a conventional example

[Fig. 5] Side sectional view of a cylinder head according to a conventional example

[Explanation of symbols]

1 cylinder head 6 Intake port 7 Exhaust port 8 Cooling water jacket 10 Exhaust valve 15a' 1st inlet 15b' Second inlet 17 Valve seat 18 First cooling groove

Claims (3)

[Scope of utility model registration request] Claim 1: In an internal combustion engine having an intake/exhaust port and a cooling water jacket inside a cylinder head, a cooling groove is formed in the jacket along a valve seat of an exhaust valve, and cooling water is forced into the cooling groove. so that it can flow
A cylinder head for an internal combustion engine, characterized in that the cooling groove is arranged downstream of an inlet for introducing cooling water into the jacket. 2. In an internal combustion engine having an intake/exhaust port and a cooling water jacket inside a cylinder head, the cooling water can be forced to flow to a portion of the jacket along a valve seat of an exhaust valve. The part along the valve seat is located downstream of the first inlet that introduces cooling water into the jacket, and the intake and exhaust valves are arranged so that the cooling water can be forced to flow between the intake and exhaust valves within the jacket. A cylinder head for an internal combustion engine, wherein the cylinder head is located downstream of a second inlet for introducing cooling water into the jacket. 3. A cooling groove is formed in the jacket along the valve seat of the exhaust valve, and the cooling groove is connected to the first inlet so that the cooling water can be forced to flow into the cooling groove. 3. The cylinder head of an internal combustion engine according to claim 2, wherein the cylinder head is located downstream.