JPS5819293Y2 - Inclined forced air cooled engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inclined forced air-cooled engine in which a fuel tank and an exhaust muffler are arranged side by side on the upper side of an engine body having an inclined cylinder.

Conventionally, in this type of engine, in order to prevent the fuel tank from heating up due to heat radiation from the exhaust muffler, the fuel tack could not be placed very close to the muffler.
Overall, the exhaust muffler and fuel tank tend to be relatively large and loose, protruding outward from the side of the engine body.

The present invention was proposed with the primary purpose of providing a tilted forced air-cooled engine that is small and compact as a whole.In order to achieve this purpose, the exhaust muffler is covered with a muffler cover. By distributing a portion of the engine cooling air inside the exhaust muffler, the heat radiated from the exhaust muffler is less likely to be radiated outside the muffler cover, making it possible to place the fuel tank very close to the exhaust muffler or muffler cover. The biggest feature is that it is structured as follows.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a front view, and reference numeral 1 generally indicates the engine body.

A synthetic resin fuel tank 4 is arranged above the crankcase 2 and the inclined cylinder body 3 of the engine body 1,
An exhaust muffler 6 covered with a muffler cover 5 is disposed above the inclined end surface 8 of the cylinder head 7 and on the side of the fuel tank 4 so as to lie back and forth.

The muffler cover 5 is placed in a position to cover the lower end of the cylinder head 7 from above.
This muffler cover prevents other objects or the human body from coming into contact with the muffler from the side or above.

A flywheel/cooling fan 9 is arranged on the front side of the crankcase 2, and a recoil starter 10 is further mounted on the front side of this.

The recoil starter 10, the flywheel/cooling fan 9, the front side of the inclined cylinder body 3, the front side of the cylinder head 7, and the front part of the muffler cover 5 are connected to the air guide case 11.
cover with

As shown in FIG. 2, an air intake port 12 is opened on the circumferential surface of the part of the wind guide case 11 that covers the recoil starter 10, and outside air is guided through the air intake port 12 by the flywheel/cooling fan 9. Inhaled into the wind case.

Since the rear side of the air guide case 11 is completely open toward the inclined cylinder body 3, the cylinder head 7, and the muffler cover 5, the cooling air is directed to the inclined cylinder body 3, the cylinder head 7, and the cylinder head 7 by the flywheel/cooling fan 9. and is fed toward the muffler cover 5.

Since the front end wall 13 of the muffler cover 5 that completely envelops the exhaust muffler 6 has an air supply port 14, the cooling air sent toward the muffler cover 5 flows through the air supply port 14 to the muffler cover 5. Proceed inside.

Since the exhaust port 16 surrounding the tail pipe 15 of the exhaust muffler 6 is open at the rear end of the muffler cover 5, the exhaust gas discharged from the tail pipe 15 is also ejected from the inside of the muffler cover 5. The exhaust air is extremely effectively discharged, and the exhaust muffler 6 and muffler cover 5 are sufficiently cooled.

Inside the air guide case 11, there is a flow of cooling air directed toward the inclined cylinder body 3 or the cylinder head 7, and a muffler cover 5.
An air distribution adjusting plate 17 is provided to divide the flow of cooling air toward the air supply port 14 of the cooling air.

The ratio of the amount of air flowing toward the air supply port 14 to the total amount of cooling air is determined by the gap 18 that spreads between the air guide case 11 and the air distribution adjustment plate 17.
It will be determined by the width of the area.

In the above embodiment, the part of the wind guide case 11 that covers the recoil starter 10 may be formed separately from the other part of the wind guide case 11.

However, forming these in one piece has the advantage that the number of parts is reduced, production costs can be reduced, and centering of the starting pulley of the recoil starter and the starting shaft becomes easier.

Further, as in the above embodiment, if the fuel tank 4 is made of synthetic resin, it has the advantage of being lighter overall and cheaper than one made of metal.

Furthermore, the air distribution adjusting plate 17 of the above embodiment is similar to the air guide case 11.
For example, it may be fixed to the air guide case 11 so as to be swingable so that the width of the gap 18 can be arbitrarily changed.

As explained above, the present invention covers the exhaust muffler with a muffler cover, and allows part of the engine cooling air to flow into the muffler cover using the air guide case, thereby sufficiently cooling the exhaust muffler and the muffler cover. Since the exhaust muffler's heat is hardly radiated outside the muffler cover, the fuel tank can be placed very close to the exhaust muffler or muffler cover, and the exhaust muffler and fuel tank can be placed on the side outside of the engine body. A compact and small product with almost no protruding parts can be obtained.

Additionally, the sufficiently cooled muffler cover prevents other objects and human bodies from coming into contact with the cylinder head, thereby preventing the risk of fire or burns.

Furthermore, since it is essentially enough to add a muffler cover and an air distribution adjustment plate to the conventional product and to slightly change the shape of the air guide case, it can be implemented easily and at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view, and FIG. 2 is a sectional view taken along the line II--II in FIG. 1. 1... Engine body, 2... Crank case, 3... Inclined cylinder body, 4...
・Fuel tank, 5...Muffler cover, 6...
...Exhaust muffler, 7...Cylinder head, 8
......Slanted end surface of 7, 9...Cooling fan, 11...Air guide case, 12...Intake port, 14... Air supply port, 17... Air distribution adjustment board.

Claims (1)

[Scope of utility model registration request] A fuel tank 4 is disposed above the crankcase 2 or the inclined cylinder body 3 of the engine body 1, and an exhaust muffler 6 covered with a muffler cover 5 is connected to the inclined end surface 8 of the cylinder head 7.
A cooling fan 9 is disposed horizontally on the upper side of the fuel tank 4 and is disposed on the front side of the crankcase 2, the front side of the inclined cylinder body 3, the front side of the cylinder head 7, and the muffler. Connect the front part of cover 5 to wind guide case 1
1, an air intake port 12 is opened in the vicinity of the cooling fan of the air guide case 11, and an air outlet 14 is opened in the front part of the muffler cover 5, and the cooling fan 9 sends air into the inside of the air guide case 11. A tilted forced air-cooled engine characterized by being provided with an air distribution adjustment plate 17 that divides cooling air into a flow toward the cylinder head 7 or the inclined cylinder body 3 and a flow toward the air outlet 14.