JPH0113784Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a fuel tank mounting device for a small engine having a recoil starter.

(Prior art) Conventionally, the fuel tank of a small engine with a recoil starter has been attached directly to the engine body using a rubber band (see Utility Model Application Publication No. 147122/1983), or attached to the engine via a small stay with a screw or the like. Attached to the main body, the engine can be made smaller. In this case, the vibration of the fuel tank itself due to the vibration of the oil level in the fuel tank acts directly on the engine body, so there is a problem that the vibration of the engine increases.

Furthermore, since the fuel tank is provided close to the engine body in order to achieve miniaturization, there is also the problem that the temperature of the fuel tank rises due to radiant heat from the engine, causing the temperature of the fuel in the tank to rise. When the temperature of the fuel increases in this way, for example, the pressure within the fuel tank fluctuates, causing a change in the amount of fuel supplied from the carburetor, which may lead to fluctuations in the air-fuel ratio.

Therefore, we took out a long stay from the engine body and inserted a rubber damper into the tip of this stay.
It is also possible to try to dampen the vibration of the engine by attaching the fuel tank with screws or the like. However, in this case, the stay is long, which not only increases the weight of the small engine, but also causes the engine, which should be small, to become larger.

(Purpose of the invention) This invention was made in view of the above-mentioned conventional problems.While maintaining the lightness and compactness of a small engine, it is possible to suppress oil level vibrations in the fuel tank from being transmitted to the engine body. , the purpose is to suppress the rise in fuel temperature.

(Structure of the invention) In order to achieve the above object, this invention first takes out a sheet metal stay from the recoil star and makes the recoil starter case, which is originally provided in a small engine, function as a damper. This suppresses oil level vibration in the fuel tank from being transmitted to the engine body.

Furthermore, a recoil starter case is disposed between the engine body and the fuel tank, and the recoil starter absorbs radiant heat from the engine body, thereby suppressing a rise in the temperature of the fuel in the fuel tank.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

In Fig. 1, 1 is the engine body, 2 is the engine body 1 and its recoil starter case 2A.
(Fig. 2) is screwed to the recoil starter,
3 is a skirt equipped with a lawn mowing cutter and a floating fan (not shown).

4A and 4B are stays, and these stays 4A,
Reference numeral 4B is made of sheet metal, and as shown in FIG. It faces the flange 8 of. This flange 8 has its through hole 9
The rubber damper 10 and the collar 11 are positioned at the flange portion 6 of the stays 4A, 4 on one end thereof, and the washer 12 is abutted on the other side. has been concluded. Note that 2B in FIG. 2 is a starter grip.

The recoil starter case 2A is arranged between the engine body 1 and the fuel tank 7.

As shown in FIG. 3, the upper stay 4A has one flange portion 6, the lower stay 4B has two flange portions 6, 6, and the fuel tank 7.
are attached to stays 4A and 4B at three locations in total.

In the above configuration, this invention has the fuel tank 7 attached to the tips of the sheet metal stays 4A and 4B taken out from the recoil starter case 2A in FIG. The engine body 1 and the fuel tank 7 are connected by a spring K consisting of a recoil starter case 2A and stays 4A and 4B. Here, the recoil starter case 2A is
As shown in FIG. 2, since it is generally a thin plate, its spring constant (rigidity) is small. Moreover, since the stays 4A and 4B are taken out from the case 2 and the fuel tank 7 is attached, the overall length l of the spring K shown in FIG. K
The spring constant becomes significantly smaller. Therefore, the vibration of the oil level in the tank 7 can be suppressed from acting on the engine body 1.

In other words, since the starter case 2A plays the role of a damper, it is possible to suppress oil level vibrations in the tank 7 from being transmitted to the engine main body 1. Moreover, since the starter case 2A acts as a damper, the fuel tank 7 acts as a kind of dynamic damper, and vibrations of the engine body 1 at relatively low frequencies can be suppressed. In this way, the transmission of oil surface vibrations and low frequency vibrations can be suppressed, thereby reducing the vibrations of the engine body.

On the other hand, the fuel tank 7 in FIG.
Since the rubber damper 10 is attached to the stays 4A and 4B via the rubber damper 10, relatively high frequency vibrations of the engine body 1 are absorbed by the rubber damper 10 and are not easily transmitted to the fuel tank 7.

Also, as mentioned above, the total length l of the spring K in FIG.
Even if the length of the recoil starter case 2A is increased, since the recoil starter case 2A is originally included in a small engine, there is little risk of impairing the lightness and compactness of the small engine.

In addition, the recoil starter case 2A in Fig. 2
Since it is arranged between the engine body 1 and the fuel tank 7, it absorbs radiant heat from the engine body 1. Therefore, since the temperature rise of the fuel tank 7 is suppressed, the temperature rise of the fuel in the fuel tank 7 can be suppressed.

As explained above, according to this invention, the recoil starter case originally provided in small engines functions as a damper and absorbs the radiant heat of the engine, which reduces the weight of small engines that should originally be small and lightweight. Moreover, it is possible to suppress the oil level vibration in the fuel tank from being transmitted to the engine body, and also to suppress the temperature rise of the fuel, without impairing the compactness. Furthermore, since the starter case serves as a damper, the fuel tank acts as a kind of dynamic damper, and can suppress relatively low-frequency vibrations of the engine body.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of this invention, Fig. 2 is an enlarged sectional view of its main parts, Fig. 3 is a front view of the stay seen from the direction of the arrow in Fig. 2, and Fig. 4 is a vibration FIG. 2 is a schematic diagram showing the system. 2A...Recoil starter case, 4A, 4B
...stay, 7...fuel tank, 10...rubber damper.

Claims (1)

[Scope of Claim for Utility Model Registration] A fuel tank mounting device for a small engine in which a recoil starter case is fixed to the engine body and a fuel tank is mounted to the engine via a rubber damper at the tip of a sheet metal stay, A fuel tank mounting device for a small engine, characterized in that the recoil starter case is taken out from the recoil starter case, and the recoil starter case is disposed between the engine main body and the fuel tank.