JPH0141907Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an engine-driven generator having an overhead fuel tank structure in which a forced air-cooled engine and a generator are covered with a cover, and a fuel tank is disposed above. This invention relates to a fuel tank cooling device for an engine-driven generator that prevents the temperature of the fuel tank from rising.

[Technical background of the invention and its problems] Conventionally, there is an engine-driven generator in which a forced air-cooled engine and a generator are disposed within a cover, and a fuel tank is disposed above. In an engine having such a structure, the engine or the zetanerator is forcibly cooled by cooling air sucked in by a cooling fan. However, the bottom surface of the fuel tank at the top is loosened by the hot air that cools the engine and generator, or by the hot air inside the cover when the engine is stopped, causing the temperature of the heating material such as gasoline to rise. For this purpose, special parts such as air guides were installed to prevent the hot air from spreading inside the cover, and the air was exhausted from the side of the cover, or insulation paint was applied to the bottom of the fuel tank, or aluminum foil was glued to the sponge. They installed insulation materials to prevent the temperature from rising.

However, it has not been possible to prevent the temperature of fuel such as gasoline from rising during long-term operation only by treating the heated hot air or hot air around the bottom of the fuel tank.

Japanese Utility Model Application Publication No. 56-117026 proposes a conventional technique in which the fuel tank and engine are separated by a shielding plate, etc., but it does not actively cool the fuel tank and the engine.
During long-term operation, it is not possible to prevent the temperature of fuel such as gasoline from rising as described above.

[Purpose of the invention] This invention was made in view of the above circumstances.
This is a forced air-cooled engine with a fuel tank located at the top, which cools the engine or zetanerator, etc., and prevents the fuel tank from being warmed up by high-temperature hot air or hot air, preventing the temperature of fuel such as gasoline from rising even during long-term operation. It is an object of the present invention to provide a fuel tank cooling device for an engine-driven generator that is capable of

[Means for Solving the Problems] The fuel tank cooling device according to the present invention is applicable to a forced air-cooled engine equipped with a cooling fan and an engine-driven generator in which the side circumference of the generator is covered with a cover and a fuel tank is disposed above. ,
A flat cooling air duct having heat insulating and buffering properties is provided along the bottom side of the fuel tank between the bottom side of the fuel tank and the top side of the forced air cooling engine, and one end of the cooling air duct is provided with a flat cooling air duct having heat insulating and buffering properties. , forming an inlet communicating with the blower housing that covers the cooling fan, forming an outlet at the other end of the cooling air duct, and further forming an outlet at a portion of the cooling air duct facing the bottom side of the fuel tank. A vent hole is formed through which a portion of the cooling air sucked by the cooling fan is guided into the cooling air duct and discharged to the bottom side of the fuel tank.

[Operation] In the above configuration, when the forced air cooling engine starts, the cooling fan rotates and external cooling air is sucked into the blower housing.

A portion of the cooling air sucked into the blower housing flows through the inlet of the cooling air duct, which is disposed between the bottom of the fuel tank and the top of the forced air-cooled engine. be introduced internally.

Next, a part of the cooling air introduced into the cooling air duct is discharged from a vent hole formed in a portion facing the bottom side of the fuel tank to cool the bottom side of the fuel tank. Further, other cooling air introduced into the cooling air duct passes through the cooling air duct and is discharged from an outlet formed at the other end, thereby ventilating and cooling the cooling air duct.

[Embodiments of the invention] Hereinafter, embodiments of the invention will be specifically described with reference to the drawings.

1 to 5 relate to an embodiment of the present invention,
Figure 1 is a partial sectional view of an engine-driven generator.
Fig. 2 is a right side view of Fig. 1, Fig. 3 is an enlarged bottom view of the cooling air duct in Fig. 1, and Fig. 4 is A-A in Fig. 3.
A sectional view on line A, Figure 5 is B of the plug cover in Figure 1.
It is an arrow view.

In these figures, reference numeral 1 is an engine, 2 is a generator directly connected to the engine 1, and the side peripheries of the engine 1 and the generator 2 are covered with a cover 3. Further, a crankshaft (not shown) protrudes from the side of the engine 1 opposite to the generator 2, and a flywheel 4 which also serves as a cooling fan is pivotally attached to this crankshaft. The sides of the flywheel 4 which also serves as a cooling fan, the cylinder 5 of the engine 1, and the cylinder head 6 are covered with a blower housing 7. Further, in the upper opening portion where the side circumferential portions of the engine 1 and the generator 2 are covered with the cover 3 etc.,
A fuel tank 8 formed into a substantially flat rectangular shape is provided so as to close the opening. The cylinder 5, cylinder head 6, etc. are cooled by cooling air sucked in by a flywheel 4 that also serves as a cooling fan due to engine rotation, and the generator 2 is cooled by a cooling fan (not shown) installed inside the generator 2. It is designed to be cooled by cooling air sucked from the first side. A hollow portion covered by the cover 3 on the top of the generator 2 and the bottom surface of the fuel tank 8 forms an expansion chamber 9, and the exhaust air that has cooled the cylinder 5, cylinder head 6, generator 2, etc. flows into the expansion chamber 9. I'm starting to do that.

On the other hand, a hollow ventilation hole 10 that passes through the tank 8 vertically is provided in a portion of the fuel tank 8 that faces the upper part of the cylinder head 6. Further, a spark plug 11 provided on the cylinder head 6 projects into the ventilation hole 10. A plug cover 12 is provided at the upper end opening of the ventilation hole 10. This plug cover 12
A large number of ventilation holes 13, . . . are formed therein.
That is, the ventilation hole 10 prevents hot air from the cylinder head 6 from directly hitting the fuel tank 8, and also allows the spark plug 11 to be replaced from the top of the fuel tank 8.

On the other hand, a cooling air duct 14 is provided on the bottom side of the fuel tank 8. This cooling air duct 1
4 is made of a material such as rubber, and is formed into a narrow, flat bag shape and a substantially square shape so as to cover the bottom side of the fuel tank 8. A cooling air inlet 16 having a connecting portion 15 projecting downward is provided at one end of the cooling air duct 14 on the blower housing 7 side, and the other end is connected to an expansion chamber above the generator 2. A discharge port 17 that opens at 9 is provided. Fuel tank 8 of the cooling air duct 14
Several ventilation holes 18 are formed in the portion facing the bottom side. Furthermore, the cylinder head 6
A plug hole 19 is formed in the upper part of the cooling air duct 14 so that it does not hit the spark plug 11, and is separated from the hollow part of the cooling air duct 14 and passes through it. A protrusion 20 protruding toward the cylinder head 6 is provided. The cooling air duct 14 is attached by inserting the connecting portion 15 into a hole formed in the blower housing 7 so as to communicate therewith, and by engaging the protruding portion 20 into the upper portion of the cylinder head 6.

In the figure, reference numeral 21 indicates a recoil starter, 22 indicates a handle, 23 indicates a filler port of the fuel tank 8, and 24, . . . indicate ventilation holes provided in the cover 3.

In the fuel tank cooling system for an engine-driven generator configured as described above, when the engine 1 starts, the flywheel 4 which also serves as a cooling fan rotates, and external cooling air is sucked into the blower housing 7. The cylinder head 6 and the like are cooled. Further, the generator 2 is cooled by drawing external cooling air from the side opposite to the engine 1 by a cooling fan (not shown) provided on the generator 2 . Then, the exhaust air that has cooled the cylinder 5, cylinder head 6, generator 2, etc. flows into the expansion chamber 9, and further flows through the ventilation hole 24 of the cover 3,
It passes through and is discharged to the outside. Further, a part of the cooling air sucked into the blower housing 7 flows into the hollow part of the cooling air duct 14 from the inlet 16 at the upper part of the blower housing 7, and a part of the cooling air flows into the cooling air duct 14. Ventilation hole 18 provided in 14
...and cools the bottom side of the fuel tank 8. Further, other cooling air from the cooling air duct 14 is discharged from the outlet 17 and is also discharged from the expansion chamber 9.
It joins the exhaust air inside and is discharged to the outside. Therefore,
The bottom surface of the fuel tank 8 is not heated by hot air or hot air that has cooled the cylinder 5, cylinder head 6, and generator 2 of the engine 1, thereby preventing the temperature of gasoline from rising. In addition, in this embodiment, a ventilation hole 10 is provided in a portion of the fuel tank 8 which is easily affected by heat above the cylinder head 6.
Since hot air from the cylinder head 6 and the like is provided, the hot air from the cylinder head 6 and the like is discharged to the outside from the ventilation holes 13, . . . of the plug cover 12 through the ventilation holes 10. Therefore,
A rise in temperature of the fuel tank 8 can be prevented. Furthermore, since the spark plug 11 protrudes into the ventilation hole 10, the overall height of the engine-driven generator can be reduced and made compact, and the spark plug 11 can be easily replaced. Furthermore, since the cooling air duct 14 is made of a material such as rubber, chatter vibrations and
The generation of noise etc. can be prevented.

In the embodiment described above, the cooling air duct 14 only needs to be formed in the shape of a flat bag along the bottom side of the fuel tank 8, and can have any size and shape. Further, it is sufficient that a part of the cooling air sucked by the cooling fan provided in the engine 1 is guided to the cooling air duct 14, and the present invention is not limited to the embodiment. Furthermore, a ventilation hole 1 provided in the fuel tank 8
0 or the plug hole 19 provided in the cooling air duct 14 may be omitted from the position of the spark plug 11 and the like.

[Effects of the invention] As explained above, according to the present invention, the following effects are achieved.

(1) A flat cooling air duct with insulation and buffering properties is installed along the bottom of the fuel tank between the bottom of the fuel tank and the top of the forced air-cooled engine, which reduces engine chatter and noise. Not only can the generation of noise and the like be prevented, but also the radiant heat of the engine to the fuel tank can be effectively blocked.

(2) In addition, an inlet that communicates with the blower housing that covers the cooling fan is formed at one end of the cooling air duct, and an outlet is formed at the other end.
A part of the cooling air introduced by the cooling fan passes through the inside of the cooling air duct from the inlet and is discharged from the outlet to ventilate and cool the inside of the cooling air duct. Therefore, radiant heat from the engine to the fuel tank is further blocked.

(3) Further, a portion of the cooling air sucked by the cooling fan is guided into the cooling air duct to a portion facing the bottom side of the fuel tank, and is directed to the bottom side of the fuel tank. Since the vent hole is formed, the fuel tank can be directly cooled by the cooling air discharged from the vent hole.

(4) As a result, the fuel tank is no longer warmed by hot air or hot air that cools the engine or generator, etc., and the temperature of the fuel stored in the fuel tank increases even during long-term continuous operation. can be effectively prevented.

[Brief explanation of the drawing]

1 to 5 relate to an embodiment of the present invention,
Figure 1 is a partial sectional view of an engine-driven generator.
Fig. 2 is a right side view of Fig. 1, Fig. 3 is an enlarged bottom view of the cooling air duct in Fig. 1, and Fig. 4 is A-A in Fig. 3.
A sectional view on line A, Figure 5 is B of the plug cover in Figure 1.
It is an arrow view. 1...forced air cooling engine, 2...generator,
3... Cover, 4... Cooling fan, 7... Blower housing, 8... Fuel tank, 14... Cooling air duct, 16... Inlet, 17... Outlet, 18
...Vent.

Claims (1)

[Scope of Claim for Utility Model Registration] In a forced air-cooled engine provided with a cooling fan and an engine-driven generator in which the side periphery of the generator is covered with a cover and a fuel tank is disposed on the top, the bottom side of the fuel tank and the forced air-cooled engine A flat cooling air duct having heat insulating and buffering properties is provided along the bottom side of the fuel tank between the top surface side and the cooling air duct, which has heat insulating and buffering properties. A communicating inlet is formed, and an outlet is formed at the other end of the cooling air duct, and a portion of the cooling air duct facing the bottom side of the fuel tank receives the cooling air sucked by the cooling fan. A fuel tank cooling device for an engine-driven generator, characterized in that a vent hole is formed to guide a part of the cooling air into the cooling air duct and discharge it to the bottom side of the fuel tank.