JPH0441220Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to an in-bonnet cooling device in which a forced air-cooled vertical shaft engine is installed.

<Prior Art> As the above-mentioned cooling device, the one shown in FIG. 3 is conventionally known for use in, for example, lawn mowers.
It has an air-cooled vertical shaft engine 2 inside the bonnet 1.
is provided with the cylinder 3 facing forward, a cooling fan 5 and an air guide case 6 are provided on the upper part of the engine 2, and a carburetor 4 is provided outside the air guide case 6 on the lateral side of the engine 2. An air exhaust port 7 made of punching metal or the like is opened in the lower side of the engine 2, and the cooling air generated by the cooling fan 5 is sent from the air guide case 6 to the cylinder 3 and the cylinder head 3a, and the cooling exhaust air coming out of the engine 2 is passed through. It is configured so that the air is discharged into the atmosphere from the exhaust port 7.

<Problems to be Solved by the Invention> However, the above-mentioned bonnet 1 is usually not provided with holes for cooling air extraction because of the need for a clean appearance in terms of design. Therefore, the hot air from the engine 2 tends to stay inside the bonnet 1. In particular, the carburetor 4, which is installed outside the air guide case on the side of the engine, is directly heated by the hot air that cools the cylinder 3 and rises to a high temperature. This phenomenon is likely to occur.

Additionally, if fuel were to overflow from the carburetor 4 due to dirt getting caught in the float valve, volatile gas would be generated within the bonnet 1, creating a risk of fire or explosion. There is.

<Means for Solving the Problems> In order to solve these problems, the present invention improves the conventional cooling device described above as follows.

That is, on the side of the engine 2, on the outside of the air guide case 6, a fuel receiver 8 that also serves as an air guide plate is installed between the carburetor 4 and the air exhaust port 7.
The air guide plate/fuel receiver 8 is configured to guide the warm exhaust air coming out of the engine 2 to the exhaust port 7 and to receive the fuel overflowing from the carburetor 4. It is characterized by the fact that

<Function> The cooling air generated by the cooling fan 5 is sent to the cylinder 3 and the cylinder head 3a in the air guide case 6.
is fed into cylinder 3 and cylinder head 3.
A tries to rise as warm exhaust air A, but it is guided by the slope 8a of the air guide plate/fuel receiver 8 and is discharged into the atmosphere from the exhaust port 7 at the lower side of the engine 2. . This prevents the vaporizer 4 from being directly heated by the warm exhaust air A.

Furthermore, even if fuel should leak from the carburetor 4, the baffle plate-cum-fuel receiver 8 will receive the leaked fuel and discharge it to a safe location outside the machine.

<Example> FIG. 1 is a side view showing the main parts of the present invention, and FIG. 2 is a plan view thereof.

In these figures, the same members as in FIG. 3 are represented by the same symbols.

An air-cooled vertical shaft engine 2 is mounted and fixed on a pedestal 10 with a cylinder 3 facing forward, and the entire engine is covered with a bonnet 1 supported on the pedestal in an openable and closable manner.

Air exhaust ports 7 made of punched metal are provided at the bottom of both sides of the engine 2, and the warm exhaust air that has cooled the cylinder 3 and the cylinder head 3a is passed through the air exhaust ports 7 into the atmosphere below the pedestal 10. It is designed to be discharged.

Between the carburetor 4 and the exhaust port 7, a fuel receiver 8 that also serves as a baffle plate is screwed to the side surface of the baffle case 6 in a backward downward slope. The warm exhaust air A coming out of the air outlet and rising is guided to the air exhaust port 7 by the inclined surface 8a. A drain 8b is provided at the lower end of this baffle plate-cum-fuel receiver 8.
is connected to a hose 9, so that even if fuel such as gasoline overflows from the carburetor 4, it can be safely discharged below the frame 10. Note that 11 is an air cleaner, 12 is an intake pipe, and 13 is an air cleaner.
is the fuel tank.

In the above embodiment, a cooling device applied to a mobile engine such as a lawn mower has been described, but the present invention is not limited thereto, and can also be applied to a stationary type engine such as one used to drive a pump.

<Effects of the invention> As explained above, in this invention, the fuel receiver that also serves as a baffle plate is placed below the carburetor so as to cover the carburetor. Even if the wind tries to rise, it is guided by the slope of the fuel receiver that also serves as a baffle plate and discharged from the exhaust port at the bottom, so the carburetor is not directly heated by the hot air and percolation due to overheating is avoided. It is possible to prevent adverse effects such as
Additionally, in the event that fuel overflows from the carburetor, it can be caught by the air guide plate and discharged outside the machine, thereby preventing the risk of fire or explosion due to overheating.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the main parts of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a side view showing a conventional example of a forced air-cooled vertical shaft engine mounted on a lawn mower. 1... Bonnet, 2... Engine, 3... Cylinder, 3a... Cylinder head, 4... Carburetor, 5... Cooling fan, 6... Wind guide case, 7...
...Exhaust port, 8...Fuel receiver that also serves as a wind guide plate.

Claims (1)

[Scope of Claim for Utility Model Registration] An air-cooled vertical shaft engine 2 is provided in a bonnet 1 with the cylinder 3 facing forward, a cooling fan 5 and a wind guide case 6 are provided in the upper part of the engine 2, and Wind guide case 6
A carburetor 4 is installed on the outside of the engine 2, and an air exhaust port 7 is opened at the lower side of the engine 2, and the cooling air generated by the cooling fan 5 is sent from the air guide case 6 to the cylinder 3 and the cylinder head 3a, and is then discharged from the engine 2. In the cooling system for the internal bonnet of a forced air-cooled vertical shaft engine configured to discharge warm air exhaust air A into the atmosphere from the air exhaust port 7, a cooling device is provided outside the air guide case 6 on the side of the engine 2.
A fuel receiver 8 that also serves as a baffle plate is provided between the carburetor 4 and the exhaust port 7 in a downwardly sloping manner. A cooling device for an internal bonnet of a forced air-cooled vertical shaft engine is characterized in that it is configured to receive fuel overflowing from the carburetor 4.