JPH0511336Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to a fuel pump, and involves rotating an arm by applying buoyancy to a float on the side of a sub-tank in which the fuel pump is installed. A level sensor having an arm with a float for detecting the fuel level is provided, and a fuel guide pipe that opens at the center of the bottom of the sub-tank is protruded, and the arm is lengthened horizontally to form an L-shape. In addition to making insertion from the fuel tank opening easier, the fuel guide pipe protrudes from the center of the fuel tank, where the change in fuel depth is minimal even if the fuel surface is tilted forward, backward, left, or right to stabilize fuel suction. This is what I did.

(Prior Art) It has already been developed to provide a level sensor on the side of a sub-tank to which a fuel pump is attached, which is inserted into the fuel tank, and which indicates the current amount of fuel to the outside by floating rotation of a float-equipped arm. Its most advanced device is the level sensor b on the side.
In this case, sub-tank a, which has been assembled in advance, is inserted. The reason why the above-mentioned assembly is used is that the level sensor b has a rotor that makes the variable resistance variable, an arm c protrudes from the rotor, and a float d must be attached to the tip of the arm. However, unless a level sensor b consisting of an arm c, a float d, etc. is assembled to the sub-tank a in advance, it is extremely difficult to assemble it inside the tank.

(Problem to be solved by the invention/purpose of the invention) In the structure outlined in Figure 5, the closer the float d is to the center of the fuel tank e, the more the level sensor body b
can improve display accuracy. For this reason, arm c
It is often necessary to lengthen the In view of this, it is an object of the present invention to solve the problem and to create a configuration that can improve the display accuracy and also facilitate the insertion of the sub-tank a into the fuel tank e.

(Means for Solving the Problems) The present invention has been made to meet the above-mentioned objectives, and the case 6 of the level sensor 5 is attached to the side of the sub-tank 4, which is inserted at a position away from the center of the fuel tank. Attachment: A rotatable arm 8 is provided on the sensor 5, and a float 12 that floats at the center of the inner surface of the fuel tank 1 is attached to the tip of the arm 8. protrude the fuel guide pipe 13 to
The float 12 is in a lowered position due to a decrease in the fuel level, and the horizontal part 9 of the arm 8 of the level sensor 5
An engaging member 10 is provided that restricts downward movement and locks the arm and the float near the horizontal angle, and rotates the arm and the float from the lower limit liquid level detection position to the upper limit liquid level detection position by the buoyant force acting on the float. Fuel tank 1 with level sensor 5 installed on the side of
This relates to a fuel pump unit characterized in that the member 10 prevents excessive rotation of the arm 8 when inserted into the fuel pump unit.

A preferred embodiment of the invention will now be described.

(Embodiment) Figures 1 to 4 of the attached drawings show an embodiment of the present invention, with Figure 1 being a partially longitudinal side view showing the insertion and assembly of the sub-tank into the fuel tank, and Figure 2 being a side view of the sub-tank. A plan view of the main parts of the present invention with parts cut away, Part 3
This figure is a side view of the sub-tank, and FIG. 4 is a side view showing how the sub-tank is inserted into the fuel tank opening.

In the figure, 1 is a fuel tank, and an opening 2 is provided at a position offset to one side from the center of the upper part.

Reference numeral 3 denotes a set plate for sealing the opening 2, and a sub-tank 4 with a fuel pump (not shown) installed inside is installed at a position offset from the center, and a level sensor 5 is installed on the outer surface of the sub-tank 4.
Attach case 6. The level sensor 5 is provided with a rotating element that rotates in contact with a variable resistor placed inside the case 6, or a rotating element 7 (Fig. 2) that sends out a potential signal that is converted depending on the angle of rotation. A rotary arm 8 is provided to change the angle by connecting to Fig. 2). The arm 8 is L-shaped, and a float 12 is attached to the tip of the horizontal part 9.
The buoyancy of the float 12 is transmitted to the rotating arm 8.
Reference numeral 10 denotes a pin-shaped engagement member for limiting downward movement provided on the outside of the sub-tank 4 corresponding to the rotary arm 8; 11 denotes an upper limit stopper pin;
rotates between the engaging member 10 that limits downward movement and the upper limit stopper pin 11.

A fuel guide pipe 13 that opens at the center of the bottom surface of the fuel tank 1 projects from the lower side of the sub-tank 4. A filter 14 is provided at the opening of the guide pipe 13.

After the sub-tank 4 is fitted inside the fuel tank 1, the float 12 floats the central portion where the fuel depth changes the least even if the fuel surface F is tilted forward, backward, left or right, as shown in FIG. Similarly, since the fuel guide pipe 13 opens in the central portion, the change in the depth of the fuel is the least.

(Operations and Effects) According to the present invention, when the sub-tank 4 with the level sensor 5 attached to the side is inserted into the opening 2 of the fuel tank 1, the float 12 of the long arm 8 with a float is inserted into the fuel tank 1. Although the diameter of the horizontal plane of the opening 2 of the fuel tank 1 has to be increased, the lower movement limiter locking mechanism locks the arm near the horizontal angle. Since the joining member 10 is provided, the fourth
As shown in the figure, connect the sub tank 4 to the opening 2 of the fuel tank 1.
Even if the sub-tank 4 is inserted into the fuel tank 1 from the opening 2 at an oblique angle to the fuel tank, and then the sub-tank 4 is vertically erected inside the fuel tank, the engaging member 1
0 prevents the arm 8 from rotating excessively or to an angle where the rotation cannot be adjusted.The rotating arm 8 is lengthened and placed in the center of the fuel tank 1, and the opening of the fuel guide pipe 13 is placed in the center of the fuel tank. By arranging it in a certain area, even if the fuel surface F is tilted forward, backward, left, or right, the change in the depth of the fuel is minimal, so that stable fuel suction can be achieved.

[Brief explanation of the drawing]

Figures 1 to 4 of the accompanying drawings show one embodiment of the present invention, with Figure 1 being a partially longitudinal side view showing the insertion and assembly of the sub-tank into the fuel tank, and Figure 2 being a partially cutaway plan view of the sub-tank. , FIG. 3 is a side view of the sub-tank, and FIG. 4 is a side view showing how the sub-tank is inserted into the fuel tank opening. FIG. 5 is a side view showing the relationship between the conventional structure and the opening of the fuel tank. 1... Fuel tank, 2... Opening, 3... Set plate, 4... Sub tank, 5... Level sensor body, 6... Case, 8... Rotating arm, 9
...Horizontal part, 12...Float, 13...Fuel guide pipe.

Claims (1)

[Scope of utility model registration request] The case 6 of the level sensor 5 is attached to the side of the sub-tank 4 that is inserted at a position away from the center of the fuel tank, and the sensor 5 is provided with a rotatable arm 8, and the tip of the arm 8 is attached to the fuel tank. A floating float 12 is attached to the center of the inner surface of the fuel tank 1, and a fuel guide pipe 13 is protruded from the sub-tank 4 to the center of the bottom of the fuel tank 1. An engaging member 10 is provided to limit the downward movement of the horizontal portion 9 of the arm 8 of No. 5 near the horizontal angle, and acts on the arm and the float from the lower limit liquid level detection position to the upper limit liquid level detection position. The fuel pump unit is characterized in that the arm 8 is rotated by the buoyancy of the sub-tank 4 and the arm 8 is prevented from excessive rotation by the member 10 when the level sensor 5 attached to the side surface of the sub-tank 4 is inserted into the fuel tank 1.