JPS5843452Y2 - fuel tank - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a fuel tank suitable for agricultural tractors etc. equipped with diesel engines.

Conventionally, in this type of fuel tank, a return oil hole for receiving return oil from the fuel injection pump projects approximately perpendicularly to the side wall of the tank body.

For this reason, it takes a lot of time and effort to fix the return oil to the large fuel tank body, which has a different shape depending on the model, by brazing or other means, and the work efficiency is poor.

Furthermore, since the return oil tube protrudes laterally from the side wall of the tank body, special care must be taken when handling the tank body after the return oil tube has been fixed, and there is a risk that the return oil tube may be damaged during transportation or the like.

In order to solve the above-mentioned conventional problems, the present invention is designed to install the refueling port back to the side wall of the fuel filler port, which is generally provided on the earthen wall of the fuel tank body, along the tank earthen wall. do.

In Fig. 1 showing the plan view of a heating tank to which the present invention is applied, 1 is the fuel tank body, 2 is a short fuel filler port provided in the center of the earthen wall of the tank body 1, and 3 is a fuel filler port on the side wall of the fuel filler port 2. It is a fixed return oil date.

Further, in FIG. 2 showing the front of the tank, 4 and 5 are oil level gauge mounting pipes, and a transparent resin pipe is attached between them to form an oil level gauge.

6 is a fuel outlet. 3rd section showing the ■-■ cross section of Figure 1
In the figure, the upper end of the fuel filler port 2 is folded inward by 180°, and a cam 7 (not shown) for tightening the tank cap is provided at the lower end thereof.

The lower end of the fuel filler port 2 is connected to the cylindrical flange 1゛4 of the tank body 1.
It is fitted and brazed.

A receiver 9 for supporting the fuel strainer 8 is spot welded to the filler port 2 in a section 10.

The receiving tube 9 is provided with one hole 11, and this hole 11 communicates the howling space 12 between the receiving tube 9 and the fuel filler port 2 with a space 13 inside the receiving tube 9.

In FIG. 4, which shows the TV-TV cross section of FIG.
The joint is sealed with brass brazing.

The return oil port 3 extends laterally along the earthen wall of the tank body 1,
The return oil pipe 16 fitted to the tip of the tank body 1
Maintain a posture along the earthen wall.

The return oil pipe 3 opens at the upper end of the space 12.

During operation of the tractor, return oil from the fuel injection pump passes through the return oil pipe 16, flows out from the return oil port 3 into the space 12, and returns to the fuel in the tank body 1.

As explained above, according to the present invention, the return oil port 3 is provided on the side wall of the fuel filler port 2, so (1) only the capacity of the fuel tank itself is changed for use in the trunk of each model, and the fuel filler port can be used for all models. be able to.

Since the return oil port 3 can be fixed in advance to the oil filler port 2, which is a small part, in a separate process, the oil filler port 2 can be attached to the tank body 1.
Installation of the return oil port 3 is completed simply by fixing it to the holder, greatly improving work efficiency.

(2) Since the return oil port 3 is located at a high position, even when the tank is full or rocking, there is no fear that the fuel in the tank will block the return oil port 3, and the return oil can be reliably returned.

(3) When the return oil port 3 is opened into the space 12 as shown in Fig. 4, the space 12 becomes a breather passage when the tank is rocking, so there is no pressure rise (the open end of the return oil port 3 If air is sealed in the tank and the oil level rises, the pressure will rise, but this does not occur), so the return oil flows smoothly.

(4) Since the return oil port 3 is made to protrude along the upper wall of the tank body 1 as shown in Fig. 4, the return oil port 3 is made to protrude along the upper wall of the tank body 1. There is less risk of damage.

In addition, the return oil pipe 16 also follows the upper wall of the tank body, so that its posture is stable, and the upper wall of the tank body plays the role of a support member for the return oil pipe 16, which has the advantage that clamps for fixing the return oil pipe 16 can be omitted or reduced. .

In that case, the accident of the return oil port 3 falling off can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a plan view, FIG. 2 is a front view, and FIGS. 3 and 4 are sectional views along mm and -rv of FIG. 1, respectively. 1...Fuel tank body, 2...Refueling port, 3...Return oil date.

Claims (1)

[Scope of utility model registration request] The return oil port 3 from the fuel injection pump is attached to the side wall of the short fuel filler port 2 provided on the upper wall of the fuel tank along the upper wall of the fuel tank, and the return oil pipe 16 connected to the return oil port 3 is installed along the earthen wall of the tank. A fuel tank that is characterized by a