JPS5842279Y2 - Device to prevent muddy water from entering internal combustion engines mounted on agricultural machinery - Google Patents

Description

[Detailed description of the invention] The present invention is an improvement of a fuel filler cap device for an internal combustion engine mounted on an agricultural machine, and in particular, a part of the bonnet that covers the top surface of the fuel tank is replaced with a space formed on the bottom surface of the fuel filler cap. When inserted, it creates a labyrinth-like drip-proof structure that prevents muddy water from entering the bonnet from the fuel filler cap attachment part.
This invention relates to a device that protects fuel tanks from damage and leakage caused by rust.

Internal combustion engines, especially horizontal internal combustion engines used in agricultural work, etc., differ from those used in passenger cars, in that they cannot handle soil, grain, straw, plants, etc.
Since this work is carried out under adverse conditions such as being covered with muddy water when cultivating rice fields, the bonnet surrounding the engine etc. is completely sealed to prevent foreign substances from entering the bonnet. However, as shown in FIG. 1, the conventional fuel tank 1 for an internal combustion engine is fixed by means such as welding the upper part 4 to a reinforcing arm 3 that protrudes from the engine 2, and the upper part 4 is fixed by means such as seam welding. A concave part 6 is provided near the center of the upper body 5, which is an integrated top cover, by means of the method described above.
A cylindrical fuel filler port 9 is fixedly bent inward, a fuel strainer 10 is attached to the fuel filler port 9 via a funnel-shaped body 11, and a gasket 12 is attached to the upper end 8 of the fuel filler port 9. The fuel filler cap 13 placed through the boss portion 14
The tip 1 of the leaf spring 16 is attached horizontally by the port 15 to
7 comes into contact with the bent end 18 of the upper end 8 of the fuel filler port 9,
It is mounted in pressure contact with the upper end 8 of the fuel filler port 9 by the elastic force caused by the deflection of the leaf spring 16.

Further, the bonnet 20 that covers the fuel tank 1 and the cooling water tank 19 has an insertion hole 21 in the upper part for inserting the fuel filler port 9, so that the bonnet 20 can be removed for maintenance of the engine or in the event of a failure. The insertion hole 21 of the bonnet 20 and the fuel filler port 9 need to be separate bodies, so it is common to provide a gap 22 between the insertion hole 21 and the fuel filler port 9. etc. are used under the harsh conditions mentioned above, so rainwater, muddy water, dust, etc. can enter through the gap 22, and the top surface of the fuel tank can get dirty, and water can get into the fuel tank made of iron plate. It causes rust on internal combustion engines and other accessories, and accelerates the deterioration and aging of electrical components.

This type of water intrusion also occurs when cleaning the aircraft body, and it is also possible to install rubber, etc. in the gaps to prevent water from entering, but in this case, not only will it increase costs, but the rubber Due to deterioration of the building, water will once again enter the building.

The present invention focuses on problems such as corrosion of the fuel tank due to muddy water entering from the fuel filler cap attachment part of conventional internal combustion engines installed in agricultural operations, and the present invention has been developed by forming a part of the bonnet on the underside of the fuel filler cap. It is inserted into a space and forms a labyrinth-like drip-proof structure to prevent the intrusion of muddy water, etc., thereby solving the above problem. While forming a bent portion that stands upward, the shape of the fuel filler cap is such that when the cap is attached to the fuel filler port, its outer peripheral edge covers the bent portion of the bonnet in a canopy shape. and an inner space into which the bent portion of the bonnet is inserted is defined inwardly on the lower surface of the outer peripheral edge.

Next, one embodiment embodying the present invention will be described in detail with reference to the accompanying drawings starting from FIG.

FIG. 2 is an overall view of an internal combustion engine using the fuel filler cap according to the present invention, and FIG. 3 is an enlarged sectional view of the fuel filler cap portion.

In the figure, 30 is a fuel tank, 31 is a fuel filter that is located between the fuel tank and the engine and is used to filter impurities mixed in the fuel supplied to the engine 32, and 33 is a fuel filter between the engine 32 and the engine 32.
An exhaust silencer is connected to an exhaust pipe 34 for guiding exhaust gas discharged from an exhaust manifold (not shown) provided in the engine 32, and 35 is an air cleaner for cleaning the air supplied to the engine 32. by engine 3
It is connected to 2.

The exhaust manifold, cylinder, cylinder head, etc. of the engine 32 are exposed to high heat and therefore require cooling, and are cooled by circulating cooling water. The radiator 37 is provided to cool such cooling water. Cooling water supply tube 3
8, and is integrated with the engine 32.

As shown in FIG. 2, the fuel tank 30 is composed of an upper body 39 that serves as the lid of the container and an upper body 40 that has a bottom. An end 41 of the upper body 39 is bent upward to form the lower body 4.
0, and both ends 41 and 42 are joined at the contact part 43 by means such as seam welding, and the upper part of the joint part 43 is bent outward to form a flange 44.
and a mounting plate 45 fixed to the engine 32.
The upper end is bent outward to form a fuel tank mount 46, and the flange 44 of the fuel tank 30 rests on the fuel tank mount 46, and its peripheral edge 4
7 is welded to the mounting base 46 so that the fuel tank 3
One end 48 of the 0 is fixed to the mounting plate 45, and the other end 49 is fixed to the radiator 37 by a nut 51 fitted into a bolt 50 fixed to the radiator 37.

The upper body 39 has a concave portion 55 that is slightly depressed toward the inside of the tank near the center, and a ring-shaped protuberance 56 is formed in the center of the concave portion 55 .
The cylindrical fuel filler port 58 is fixed to the central step 57 of the 6 by means of brazing or the like, and has a cap receiving portion 59 bent inward at its upper portion, and is connected to the cap receiving portion 59 through a packing 60. The placed fuel filler cap 61 is attached to a flat spring 64 horizontally attached to the boss portion 62 by a port 63.
The tip 65 of the fuel filler port 58 is in contact with the bent end of the cap receiver 59 of the fuel filler port 58, and is attached to the cap receiver 59 of the fuel filler port 58 by the elastic force caused by the deflection of the leaf spring 64. .

A bonnet 66 that covers the fuel tank 30 and the radiator 37 has a bent portion 6 that is bent upward at the entire periphery of an insertion hole 70 that is bored through which the fuel filler port 58 is inserted.
7, and when the fuel filler cap 61 as shown in FIGS. 2 and 3 is attached to the upper end of the fuel filler port 58 that protrudes one inch upward from the fuel tank 30, the outside of the fuel filler cap 61 is attached. The outer circumferential edge 68 of the fuel filler cap 61 covers the bent portion 67 of the bonnet 66 in a canopy shape so that the outer circumferential edge 68 covers the bent portion 67 , so that the inner space 69 within the outer circumferential edge 68 is covered. A bending portion 67 is inserted into.

As described above, in the present invention, when the fuel filler cap is attached to the fuel tank, the bent part provided at the periphery of the fuel filler port of the phone that covers the fuel tank etc. By covering the fuel filler cap, the outer peripheral edge of the fuel filler cap and the bent part of the bonnet opening form a labyrinth-like part that prevents water from entering, thereby preventing the fuel tank from rusting. In addition, the structure is simple, and there is no cost increase as would be required when inserting rubber or the like into the entry point for water, etc., and the bonnet can be removed from the fuel filler port, which is advantageous for maintenance. can significantly increase aptitude in

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional fuel tank, etc., FIG. 2 is an overall view of a horizontal internal combustion engine to which an embodiment is applied, and FIG. 3 is an enlarged sectional view of a fuel filler cap portion. 30...Fuel tank, 58...Fuel filler port, 61...Fuel filler cap, 66...
...Bonnet, 67...Bend portion, 68...
...Outer peripheral edge, 69...Inner space, 70...
...Refueling port insertion hole.

Claims (1)

[Scope of utility model registration request] A cylindrical fuel filler port 58 projecting upward from the fuel tank 30 is connected to a bonnet 6 that covers the upper surface of the fuel tank 30.
In an internal combustion engine mounted on an agricultural machine, in which a fuel filler cap 61 is attached to the upper end of the fuel filler port 58 and protrudes from the fuel filler port insertion hole 70 of No. 6 to the upper surface side of the bonnet 66, the entire periphery of the insertion hole 70 On the other hand, the shape of the fuel filler cap 61 is such that when the cap 61 is attached to the fuel filler port 58, its outer peripheral edge 68 forms a bent portion 67 of the bonnet 66. 67 is shaped like an eaves, and an inner space 69 is formed inside the lower surface of the outer peripheral edge 68 into which the bent portion 67 of the bonnet 66 is inserted. A device to prevent muddy water from entering an engine.