JPS6323537Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake/exhaust system cooling device for a water-cooled internal combustion engine, which is used, for example, as a drive source for a portable generator.

In order to make the above-mentioned water-cooled internal combustion engine soundproof, for example, if the water-cooled internal combustion engine is housed in a box lined with soundproofing material or a box made of soundproofing material itself, and the cooling water radiator is placed outside the box. However, since there is radiant heat from the cylinder block, cylinder head, oil pan, exhaust system, etc., the temperature inside the soundproof box increases when the engine is operated for a long time. There is a risk of generation of shock.

If the intake pipe and the exhaust pipe are arranged on the same side of the cylinder and connected to the carburetor and the muffler, respectively, in order to make the engine small and compact, the problem of percolation is even more severe.

In the present invention, as a measure to prevent percolation in the soundproof engine, a cooling fan is installed in the water-cooled internal combustion engine to actively ventilate problem areas within the soundproof box.

That is, in a water-cooled internal combustion engine E in which the intake pipe 1 and the exhaust pipe 2 are arranged on the same side of the cylinder 3 and connected to a carburetor 4 and a muffler 5, respectively, and the entire engine is housed in a soundproof box 6, the intake pipe 1 A series of ducts 8 are provided surrounding the exhaust pipe 2 and further forming a muffler storage chamber 7 and leading to the outside, and a heat shield plate 9 is arranged at least on the side facing the cylinder 3 of the carburetor 4, 10 is provided with a fan 11, and the fan 1
The gist is that a fan cover 12 is provided around the fan 11 to guide outside air taken in by the fan 11 to the duct 8.

In this embodiment, a portable generator is driven by a water-cooled internal combustion engine E implementing the device of the present invention, and the generator G is directly connected to the engine E and mounted on an underframe 14 with wheels 13 in a vibration-proof manner. There is.

Air purifier 15 above engine E, fuel tank 16 above generator G, silencer 5 on the left and right of generator G
and a heat radiator 17 are arranged, respectively, and the heat radiator 17
Except for , the others are housed in a soundproof box 6. A minimum number of ventilation holes 18 are provided at multiple locations on the bottom and top surfaces of the box 6.
19 and 20 are open.

The fan 11 is integrally attached to the front surface of a flywheel 21 that is integral with the crankshaft 10, similar to an air-cooled internal combustion engine, and the cover 12 is attached to the fan 1.
It is formed in a scroll shape surrounding the outer periphery and front and rear surfaces of 1, and also serves as a cover for the timing belt 22 for driving the camshaft. The timing belt 22 also serves to drive the cooling water pump 23.

The front end of the duct 8 is connected to the rear surface of the fan cover 12 and communicates with the hole 24. The hole 24 just faces the contact portion between the timing belt 22 and the driven pulley 231 of the cooling water pump 23.

The duct 8 surrounds both the intake pipe 1 and the exhaust pipe 2 and extends toward the muffler 5, and expands in diameter at the muffler 5 to form a muffler storage chamber 7 while reaching the rear surface of the soundproof box 6 and opening. are doing.

The heat shield plate 9 is fixed to the side surface of the duct 8 so as to cover the side of the carburetor 4 facing the cylinder 3, the front, rear, and lower surfaces thereof. That is, above the carburetor 4 and the cylinder 3.
and the other side is open. Bottom surface 91 of heat shield plate 9
doubles as a saucer, and there is a drain tube 2 at the bottom.
5 is connected.

When the crankshaft 10 rotates, outside air is introduced from the hole 121 at the bottom of the cover 12 by the fan 11, and the outside air is guided by the cover 12 and flows into the duct 8 through the hole 24 while cooling the timing belt 22, and is exhausted. The tube 2 is cooled and the silencer 5 is cooled while being discharged to the outside.

Radiant heat from the cylinder block, oil pan, etc. that affects the carburetor 4 is blocked by the heat shield plate 9.

Since the present invention has the above structure, when the water-cooled internal combustion engine E is housed in the soundproof box 6 to make it soundproof, even if the intake pipe 1 and the exhaust pipe 2 of the engine E are arranged on the same side of the cylinder 3. , the exhaust pipe 2 and the muffler 5 connected thereto are intensively ventilated and cooled with outside air. Therefore, the effects of radiant heat from the exhaust pipe 2 and conductive heat from the intake pipe 1 on the carburetor 4 are eliminated.

In addition, together with the effect of the heat shield plate 9 to block radiant heat from the lower part of the engine, the influence of heat on the fuel system including the carburetor 4 is reduced, which is effective as a measure to prevent percolation.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view of a portable generator implementing the device of the present invention, Fig. 2 is a longitudinal rear view thereof, Fig. 3 is a partially longitudinal front view showing the main parts of the device of the present invention, and Fig. 4 is its longitudinal side view. Longitudinal side view. 1 is an intake pipe, 2 is an exhaust pipe, 3 is a cylinder, 4 is a carburetor, 5 is a silencer, 6 is a soundproof box, 7 is a silencer storage chamber, 8 is a duct, 9 is a heat shield, 10 is a crankshaft , 11 is a fan, 12 is a fan cover, and E is a water-cooled internal combustion engine.

Claims (1)

[Scope of utility model registration request] In a water-cooled internal combustion engine in which the intake pipe and exhaust pipe are placed on the same side of the cylinder and connected to a carburetor and a muffler, respectively, and the entire engine is housed in a soundproof box, the intake pipe and exhaust pipe are surrounded and a muffler is installed. Along with providing a series of ducts forming a containment chamber and leading to the outside,
An intake/exhaust system cooling device for a water-cooled internal combustion engine, comprising a heat shield plate disposed at least on the side facing the cylinder of a carburetor, and a fan cover for guiding outside air taken in by a fan provided on the crankshaft to the duct.