JPS6018418A - Fuel tank of service machine - Google Patents

Abstract

PURPOSE:To surely prevent fuel leakage by forming a fuel supply opening on the upper face of a fuel tank at the end part thereof which comes uppermost when a service machine falls down in a certain direction and upwards swelling the upper face part of the tank except the fuel supply opening. CONSTITUTION:In a service machine such as a lawn mower or the like, the upper wall 11 of an engine unit cover, the partition wall 13 formed downwards from said wall and a box 15 define a fuel tank 20. A recess 12 is formed on the cover's upper wall 11 and has a fuel supply pipe 21 opened thereat. A tank's top part 22 other than the part around the pipe 21 is swelled upwards. The tank 20 is filled with fuel up to the level L flush with the bottom of the recess 12 and a cap is then tightly screwed on the supply pipe 21. In such condition, if the service machine falls approximately 90 deg. sideways to the left, fuel is flooded into the space S1 which comes to the position below the supply pipe 21 at that time. Since the fuel level is beneath the line extending from the left-side inwall of the supply pipe 21, no fuel leaks from the breather hole of the cap.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a fuel tank in a working machine such as a lawn mower equipped with an engine.

In general, for lawn mowers equipped with an engine, it is necessary to inspect the lawn mower by tilting it sideways approximately 90 degrees in case of problems such as collisions with stones, etc. to the lawn mower blades, or grass clogging in the housing that houses the blades. Since the fuel inlet is located on the top of the fuel tank, if the lawnmower is tipped on its side with a large amount of fuel, there is an inconvenience that fuel will leak from the breather hole in the inlet cap. .

This is true not only for lawn mowers but also for engine operating machines such as snow blowers.

The present invention has been made to solve the above-mentioned inconveniences, and its purpose is to prevent fuel leakage even when a working machine is laid down on its side for inspection etc. when the tank is almost full. To provide fuel tanks for work equipment.

In order to achieve such an object, the present invention provides a fuel inlet at the upper end of the fuel tank, which is located upward when the work machine is laid down to one side, and further eliminates the area around the inlet. The gist is that the upper surface of the tank is formed to bulge above the lower end surface of the inlet, and the volume of the bulge below the level of the inlet when the work equipment falls is greater than the internal volume of the tank above this level. do.

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a side view of a lawn mower, which is an example of a working machine, and FIG. 2 is a plan view of the cover of the engine unit.

Wheels 3 and 4 are provided on the left and right at the front and rear of the frame 2 of the lawn mower 1, and at the bottom of the frame 2 there is provided a housing 5 that accommodates a lawn mowing blade (not shown). The post 6 is connected, and the upper part of the engine unit 7 mounted on the frame 2 is covered with the cover 1.
Covered by 0. Furthermore, a duct 8 is arranged on one side of the cover 10, and the rear end of the duct 8 is connected to a handle post 6.
A glass bag 9 hung on is connected.

A fuel tank 20 is provided on the lower surface side of the upper wall 11 of the cover 10.
is configured.

That is, a downwardly recessed recess 12 is formed at the rear of the central part of the cover 10 near the duct 8 arrangement space 19 formed on one side of the cover 10, and a fuel injection pipe 21 is inserted into this recess 12. Further, a partition wall 13 that extends from the front to the left side and surrounds a substantially rectangular plane is formed to hang down from the lower surface of the cover upper wall 11. The upper end of the peripheral wall 16 of the box 15, which has the same planar shape, is superimposed on the lower end of the partition wall 13 and fixedly joined together. This is shown in longitudinal section in FIGS. 3 and 4.

In this way, the cover upper wall 11 and the gap M formed on the lower surface thereof
13 and a box 15 to form a fuel tank 20, and a recess 12 in the cover upper wall 11 forming the upper surface of the tank 20.
The tank ceiling 22 except for the area around the fuel injection pipe 21 provided in the tank is bulged upward as shown in the figure.

The bottom wall 17 of the box 15 forming the lower surface of the fuel tank 20
A fuel supply pipe 23 is formed therein.

Next, to describe the operation of the fuel tank 20 constructed as above, first, fuel is injected into the tank 20 until it reaches the lower end surface of the injection tube 21, that is, the lower surface level L of the four parts 12, and then the injection tube 21 is filled with a cap 24. to fit tightly. As a result, the fuel becomes full, but the tank ceiling 2 except around the injection pipe 21
2 bulges out, a relatively large space is secured above the fuel full level LJ:.

When the lawn mower 1 is tipped over about 90 degrees to the left side for inspection or the like with the fuel tank 20 full, fuel flows into the space Sl located below the injection pipe 21 in the sideways condition, as shown in FIG. As shown, the extension line l of the left inner wall of the injection tube 21
Since the fuel level is below, the fuel will not overflow into the injection pipe 21, and therefore the fuel will not leak from the breather hole provided in the cap.

In the above, the highest level lJl:! ll
The upper tank internal volume Sob and the space Sl may be at least equal to each other, that is, S□≧So.

In the embodiment, the fuel tank is integrally formed on the lower surface of the cover of the engine unit, but it is of course possible to form the fuel tank separately.

As is clear from the above description, according to the present invention, a fuel inlet is provided at the end of the top of the tank that becomes the highest when the work machine is tilted in a certain direction, and the top of the tank is closed except around this inlet. The bulge is formed upward, and the volume of the bulge below the 5th bell of the inlet when the work machine is tipped over is greater than the internal volume of the tank above this, so even if the work machine is tipped on its side, the bulge will not leak when it is on its side. Fuel flows into the bulging space within the tank located below the inlet, and therefore fuel leakage can be prevented even when the tank is full.

[Brief explanation of drawings]

Figure 1 is a side view of the working machine, Figure 2 is a plan view of the cover of the engine unit, and Figures 3 and 4 are longitudinal sections of the fuel tank.
FIG. In the drawing, 20 is the fuel tank, 12 is the four parts on its upper surface, and 2
1 is a fuel injection port, 22 is a bulging portion, Sl is a volume of the bulging portion below the injection port level when the working machine falls over, and So is an internal volume of the tank above the injection port level. Patent Applicant Honda Motor Co., Ltd. Agent Patent Attorney 1) Kuni Ohashi, Patent Attorney, Department, Yu Koyama, Patent Attorney, Department

Claims (1)

[Claims] In working machines such as lawn mowers equipped with an engine, a fuel inlet is provided on the upper surface of the fuel tank at the end that is the highest when the working machine is tilted in a certain direction, and the area around the inlet is The upper surface of the fuel tank, excluding the fuel tank, is formed to bulge above the lower end surface of the inlet, and the volume of the bulge below the inlet level when the work equipment falls is greater than the internal volume of the tank above the inlet level. A fuel tank for a working machine characterized by being formed as follows.