JP2547646Y2 - Water-cooled exhaust manifold for internal combustion engines - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water-cooled exhaust manifold for an internal combustion engine (particularly a marine engine with a supercharger).

[0002]

2. Description of the Related Art Among exhaust manifolds that have been widely used in internal combustion engines, especially marine engines, particularly those having six or more cylinders in which exhaust gas is gathered rearward or forward, the exhaust gas is discharged from each cylinder. The exhaust gases interfere with each other and adversely affect the performance of the engine. In order to avoid such exhaust interference, as shown in FIG. 3, for example, the exhaust from the cylinder head 21 is transferred to the exhaust passages 22 from the cylinders # 1, # 2, # 3 and the exhaust passages # 4, # 5, # 6. A means is adopted in which at least two parts are made to flow to exhaust outlets 24 and 25 like an exhaust passage 23 from a cylinder.
In this case, the cooling of the exhaust gas is performed by flowing seawater or fresh water through the hatched portion in the figure. Also,
Reduction of heat capacity of exhaust manifold and improvement of durability reliability
JP-A-63-215809 has been proposed for this purpose.
ing. According to the official gazette, three banks each on the left and right banks
Inner pipes are provided for the cylinders, and they are cast with an outer pipe made of cast iron
Water between the left and right exhaust passages
The presence of a jacket is shown.

[0003]

However, in the above-described water-cooled exhaust manifold, although exhaust interference can be avoided, since the exhaust gas passes through the inside and outside of the boundary portion 26 of the exhaust passages 22 and 23, the boundary of the water-cooled exhaust manifold is limited. The portion 26 is not cooled, which often results in excessive thermal stress, which reduces the durability of the manifold.
In JP-A-63-215809, the left
Cooling water exists in the water jacket between the right exhaust passages.
However, the heat in the left and right exhaust passages
Excessive heat is generated in the data jacket, resulting in excessive thermal stress
However, there is a problem that the durability of the manifold is reduced.
You.

In view of the foregoing, the present invention provides a water-cooled exhaust manifold for an internal combustion engine which can improve the durability of the manifold by cooling the boundary between the two exhaust passages, and has the drawbacks of the prior art. The purpose of this is to solve the problem.

[0005]

Means for Solving the Problems To achieve the above object,
For this purpose, the water-cooled exhaust manifold of the internal combustion engine according to the present invention has an exhaust passage extending from all the cylinders by a plurality of cylinders.
First exhaust passage and second exhaust passage collectively flowing to an exhaust outlet
In a water-cooled exhaust manifold of an internal combustion engine having
Towards the exhaust outlet located either before or after the fuel engine
The first exhaust passage and the second exhaust passage are arranged in parallel,
Cold outside each of the first exhaust passage and the second exhaust passage
Along with forming a cooling chamber, it communicates with each cooling chamber,
And a common cooling between the first exhaust passage and the second exhaust passage.
A cooling chamber is provided, and cooling is performed from the exhaust outlet side where this common cooling chamber side is located.
It is characterized by flowing recirculating water into the cooling chamber .

[0006]

According to the above construction, the entire circumference of each exhaust passage can be cooled, and the boundary between the first and second exhaust passages is also cooled. In addition, the first exhaust passage and the second exhaust passage are provided between the first exhaust passage and the second exhaust passage.
Each provided outside the first exhaust passage and the second exhaust passage
A common cooling chamber communicating with the cooling chambers of the
The cooling water flows from the exhaust outlet side where the
The reject chamber receives heat from both the first exhaust passage and the second exhaust passage.
Even if it cools, it is cooled by the cooling water that starts flowing into the cooling chamber
Therefore, it is well cooled and does not generate excessive heat.

[0007]

FIG. 1 is a sectional view of an embodiment of a basic structure of a water-cooled exhaust manifold of an internal combustion engine according to the present invention.

In the present invention, as shown in FIG. 1, exhaust from all cylinders (six in the embodiment) is divided into a plurality of cylinders (# 1, # 2, # 3 together), (# 4, # 4). First and second exhaust passages 4 and 5 are provided so that the exhaust passages 4 and 5 are sent out to the exhaust outlets 2 and 3 collectively.
Is formed in a cooling chamber 6 and a boundary 7 between the first and second exhaust passages 4 and 5 is communicated with the cooling chamber 6.

Of the exhaust air from each exhaust inlet of each of the cylinders # 1, # 2, # 3, # 4, # 5, and # 6 provided on the upper surface of the cylinder head 1, the cylinders # 1, # 2, # 3
Exhaust from the cylinders # 4, # 5, and # 6 merge into the second exhaust passage 5 and are discharged from the respective exhaust outlets 2 and 3. At this time, the first and second exhaust passages 4 and 5 are cooled by the cooling water such as seawater or fresh water introduced into the cooling chamber 6, and the space between the first exhaust passage 4 and the second exhaust passage 5 is changed. Border 7 of
Is also cooled by the cooling water.

FIG. 2 shows an actual shape of FIG. 1 embodied by a casting or the like. The first exhaust passage 4 exhausts the exhaust from the exhaust inlets # 1a, # 2a, # 3a of each cylinder together. The second exhaust passage 5 is connected to an exhaust inlet # 4a, # 5a, # 6a of each cylinder.
The exhaust gas from the pump is sent to the exhaust outlet 2 together. These first and second exhaust passages 4 and 5 are formed in tubular bodies 8 and 9, respectively, and both tubular bodies 8 and 9 are housed in a cooling chamber 6. Therefore, the space between the first exhaust passage 4 and the second exhaust passage 5 is in the same cooling chamber 6, and the tubular bodies 8 and 9 of the exhaust passages 4 and 5 facing the boundary 7 are also in the cooling chamber 6. The cooling water does not cause excessive thermal stress. In the drawing, reference numeral 10 denotes an inlet of the cooling water, and 11 denotes an outlet.

[0011]

As described above, according to the present invention, the first and second exhaust passages are provided on the side surface of the cylinder head so that exhaust from all the cylinders is collectively flowed by a plurality of cylinders to the exhaust outlet. An outside of the passage is formed in the cooling chamber, a boundary between the first and second exhaust passages is communicated with the cooling chamber, and a boundary between the first and second exhaust passages is formed.
A common cooling chamber, and the common cooling chamber
Even if heat is received from both the air passage and the second exhaust passage, the cooling chamber
Cooled by cooling water that begins to flow to
No longer generates excessive heat, and the exhaust manifold
Life can be improved. It also makes complex steel tubes.
Complex, such as casting the steel in a cast iron outer tube.
The simple shape of the casting and the common cold
Cooling room should be cooled with cooling water that starts flowing into the cooling room
As a result, excessive thermal stress does not occur.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an embodiment of a basic structure of a water-cooled exhaust manifold of an internal combustion engine according to the present invention.

FIG. 2 is an explanatory view showing a cross section of a water-cooled exhaust manifold that embodies FIG. 1;

FIG. 3 is an explanatory view showing a cross section of a conventional water-cooled exhaust manifold.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder head 2, 3 Exhaust outlet 4 First exhaust passage 5 Second exhaust passage 6 Cooling chamber 7 Boundary part # 1 to # 6 Cylinder

Claims (1)

(57) [Scope of request for utility model registration] An exhaust passage from all the cylinders is connected to a cylinder.
The first exhaust passage and the
Water-cooled exhaust manifold for internal combustion engine with two exhaust passages
The exhaust outlet provided either before or after the internal combustion engine
The first exhaust passage and the second exhaust passage are arranged in parallel toward the mouth.
Each of the first exhaust passage and the second exhaust passage
The cooling chambers are formed outside the
And between the first exhaust passage and the second exhaust passage.
A common cooling chamber is provided, and the exhaust
A water-cooled exhaust manifold for an internal combustion engine, characterized by flowing cooling water from a mouth side into a cooling chamber .