JPH0716038Y2 - engine - Google Patents

Description

TECHNICAL FIELD The present invention relates to an engine in which a water manifold for guiding cooling water sent from a water jacket of a cylinder head to a radiator is located in a region between an exhaust manifold and a cylinder head cover.

Since the high temperature exhaust gas discharged from the combustion chamber circulates in the exhaust manifold of the prior art engine, the temperature around it also becomes high, and the radiant heat is transmitted to the cylinder head cover located near the exhaust manifold, and the cover is heated. May occur. The high temperature of the cylinder head cover not only adversely affects the components inside the cover, but also accelerates the deterioration of the cover, especially when the cover is made of synthetic resin.

Therefore, conventionally, a shield that blocks heat is arranged between the exhaust manifold and the cylinder head cover to protect the cylinder head cover from the heat. For example,
As shown in Japanese Utility Model Laid-Open No. 52-8715, a shield consisting of a double pipe communicating with an engine water jacket is arranged around the exhaust manifold, and this shield blocks heat from the exhaust manifold. A structure for protecting the cylinder head cover from heat is known. If such a shield is provided, the cylinder head cover can be reliably protected, and the early deterioration of the cover and the influence of heat on the parts inside can be prevented.

However, according to the conventional configuration as described above, the shield has to be added as an independent component, which increases the number of engine components. Moreover, it is necessary to assemble such a shield when manufacturing the engine, which complicates the work. For this reason, the structure of the engine is complicated and the manufacturing cost thereof is inevitable.

If the water manifold that guides the cooling water discharged from the water jacket outside the combustion chamber is located between the exhaust manifold and the cylinder head cover, as in the engine described at the beginning, the water manifold has a large installation space. Therefore, it may be difficult to secure a space for arranging the shield.

OBJECT The object of the present invention is to provide an engine of the type mentioned at the outset in which the abovementioned drawbacks of the prior art are eliminated with a simple construction.

Configuration The present invention positively utilizes the fact that the water manifold for guiding the cooling water sent from the water jacket of the cylinder head to the radiator is located in the area between the exhaust manifold and the cylinder head cover, and thus the heat insulation is performed. We propose a structure that protects the cylinder head cover from heat by integrally forming the shield on the water manifold itself.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

1 is a plan view of the engine, FIG. 2 is a partial sectional front view thereof, and FIG. 3 is a partially enlarged view of FIG. In these figures, the cylinder head 2 is placed on top of the cylinder block 1.
Is fixed, and the cylinder head cover 3 is fixed thereon. A combustion chamber (not shown) is defined inside the cylinder block 1 and the cylinder head 2, and the burned exhaust gas discharged from the combustion chamber is shown in FIG. 1 inside the exhaust manifold 4 connected to the cylinder head 2. It flows as shown by arrow A and is discharged to the outside.

Cooling water flows through a water jacket (not shown) formed around the combustion chamber to cool the cylinder block 1 and the cylinder head 2. However, the cooling water that has left the water jacket of the cylinder head 2 is The water manifold 5 connected to 2 flows as shown by an arrow B, and is sent to a radiator (not shown). In this way, the water manifold 5 guides the cooling water sent from the water jacket of the cylinder head 2 to the radiator.

As can be seen from FIGS. 1, 2 and 3, the water manifold 5 is located in the region between the exhaust manifold 4 and the cylinder head cover 3.

The exhaust gas of high temperature discharged from the combustion chamber flows through the exhaust manifold 4, and the temperature around the exhaust gas also becomes high. Therefore, if left unattended, heat is transferred to the cylinder head cover 3 located near the exhaust manifold 4,
The cover 3 and the parts inside thereof are affected by heat.

Therefore, in the illustrated engine, a shield 6 is integrally formed on the water manifold 5 itself located in a region between the exhaust manifold 4 and the cylinder head cover 3, and the shield 6 moves from the exhaust manifold 4 to the cylinder head cover 3 by the shield 6. It is configured to block radiant heat that is directed.

With the above configuration, the cylinder head cover 3 can be protected from the heat of the exhaust manifold 4, and even when the cover 3 is made of synthetic resin, deterioration of the cover 3 due to heat can be prevented. Further, even if the exhaust gas leaks from the seal portion 7 (FIG. 3) between the cylinder head 2 and the exhaust manifold 4, the leaked high temperature exhaust gas is shielded by the shield 6.
This gas is shut off by the cylinder head cover 3
It is possible to prevent the inconvenience of reaching.

Further, since the shield 6 is formed integrally with the water manifold 5, the number of parts can be reduced and the assembling workability can be improved as compared with the case where the shield is configured as an independent member. In this way, the manufacturing cost of the engine can be reliably reduced. Moreover, since the shield 6 is formed on the water manifold 5 itself, the water manifold 5 does not eliminate the space for installing the shield, and it is not necessary to give special consideration to the space for disposing the shield 6. This greatly expands the degree of freedom in engine design.

The present invention can be particularly advantageously applied when the cylinder head cover is made of a synthetic resin which is easily affected by heat, but it is naturally applicable when the cover is made of a material other than resin.

Effect According to the present invention, since the shield for heat insulation is provided on the water manifold, not only can the cylinder head cover be protected from heat but also the number of parts of the engine can be reduced and the assembling workability thereof can be improved. Therefore, the manufacturing cost of the engine can be significantly reduced.

Further, since the shield is formed on the water manifold itself, the water manifold does not eliminate the installation space for the shield, and it is not necessary to give special consideration to the space for arranging the shield. This can increase the degree of freedom in engine design.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an example of an engine according to the present invention, FIG. 2 is a partial sectional front view thereof, and FIG. 3 is a partially enlarged view of FIG. 2 with a part omitted. It is a figure. 2 ... Cylinder head 3 ... Cylinder head cover 4 ... Exhaust manifold 5 ... Water manifold 6 ... Shield

Claims (2)

[Scope of utility model registration request] 1. In an engine in which a water manifold for guiding cooling water sent from a water jacket of a cylinder head to a radiator is located in a region between the exhaust manifold and the cylinder head cover, heat from the exhaust manifold to the cylinder head cover is provided. An engine characterized in that a shield for shutting off is formed integrally with the water manifold. 2. The engine according to claim 1, wherein the cylinder head cover is made of synthetic resin and is registered as a utility model.