JPH0125053Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a fuel tank device for a vehicle.

The suction pipe type fuel tank is as shown in Fig. 5, with a suction pipe 52 facing inside the tank 51, with an upper end 52a protruding above the tank 51, and connected to a pump and a carburetor. However, the lower end 52b of one pipe 52 faces apart from the bottom 51a of the fuel tank 51, and the lower end 52b faces the bottom 51a of the fuel tank 51.
A filter 53 is provided around the periphery of the pipe 52, and a float-type fuel detection means 52 and a residual amount detection sensor 55 are attached to the lower part of the pipe 52.

In the above fuel tank, when the tank is assembled to a vehicle, or when the internal pressure of the tank increases or decreases due to climate change, thermal effects, etc., the capacity of the tank changes, and the inlet end 52c of the pipe 52 and Bottom 51a
The clearance S between the tank 51 and the tank 51 changes, and it is difficult to correct this in practice. It will vary.

Furthermore, there is a prior art in which a pressure biasing means for the end of the pipe facing into the tank, such as a leaf spring, is fixedly supported on the tank side.
It is difficult to maintain the suction end of the pipe in a constant position due to spring installation errors and variations in the processing of the leaf spring itself.

The present invention has been made to improve the above-mentioned disadvantages, and its purpose is to provide a bent portion at a suitable position downstream of the suction end of the suction pipe facing into the tank, and to connect the upstream side of the bent portion to the side of the tank. The clearance between the suction end and the upper surface of the bottom of the tank is maintained constant even if the volume inside the tank changes due to changes in tank internal pressure, etc., and the ineffective remaining amount of fuel is maintained. To provide a fuel tank device for a vehicle which prevents variations in fuel tank.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is an enlarged view of the first embodiment, where 51 shows the tank, 51a shows the bottom floor of the tank, 1 is a suction pipe, and the upstream part 2 of this pipe is bent into an inverted L shape. The upper part of the hanging tip part 2a is bent laterally 2b and extends laterally into the tank by a predetermined length to form an upstream base part 2c. A remaining amount detection sensor storage chamber 3 is provided at the intermediate lower part to the upper circumference of the hanging tip part 2a, and the upper half of the filter 4 is stored and held in the side part of the chamber 3. The lower end 4a of the filter 4 protrudes downward, and the lower end 4a of the filter 4 extends below the suction end 2d at the tip of the hanging tip 2a of the pipe and comes into contact with the floor 51a.
A clearance S is provided between the suction end 2c and the suction end 2c.

A rubber hose 5 connects the base 2c of the upstream section 2 to the base end 2e.
The tip 6a, which forms the upstream end of the downstream section 6 of the pipe 1, which is connected to the pump and fuel supply device by leading the base out of the tank, is fitted to the base of the rubber hose 5. Bands 7, 7 are wound around both ends of the rubber hose 5 and fastened to the other end, and a leaf spring 8 is bridged between the flanges 7a, 7a of the bands 7, 7, and both ends of the leaf spring 8 are tied to the flange parts. 7a,
7a with screw 9 and nut 10, and plate spring 8
Then, the upstream section 2 is elastically biased onto the tank floor surface 51a using the flexible section made of the rubber hose 5 as a fulcrum. In the figure, reference numeral 11 is a stopper attached to the leaf spring 8.

As a result of the above, the upstream portion 2 of the suction pipe 1 is elastically biased onto the tank floor surface 51a using the flexible portion 5 as a fulcrum, and the lower end portion 4a of the filter 4 forming a stopper is
is in contact with the floor surface 51a, and even if the floor surface 51a rises and falls due to changes in tank internal pressure, tank assembly to a vehicle, etc., the filter 4 follows this and the lower end 4a is always in contact with the floor surface 51a, and the clearance S is maintained constant, the clearance S remains constant without changing, and the ineffective remaining amount of fuel during this period remains constant.

FIG. 3 shows a second embodiment, in which the same parts as in the above embodiment are denoted by the same reference numerals, and detailed explanation will be omitted.

The upstream section 102 of the suction pipe is vertically straight, and its downstream end (upper end) is fitted into the tip of a bellows 105 made of rubber or the like, and the upstream end ( The tip) is fitted into the rear end of the bellows 105, and the tip 106a of the downstream portion 106 is bent upward and the tip 106a
The bent portion of the spring 108 is connected by brazing or the like by spanning the bifurcated base 108a of the spring 108, which has a bifurcated inverted L shape, so that one rod portion 108b of the spring 108 is placed on the case 3 side, and the other rod portion 108c is placed on the side of the case 3. It is fixed at a proper place in the upstream section 102 by brazing or the like. As a result of the above, the upstream section 102 has a floor surface 5
1a, the lower end 4a of the filter 4
is in contact with the floor surface, and the tank floor surface 51a and the suction end 1
02d will be maintained constant.

As is clear from the above, according to the present invention, the clearance between the suction end of the suction pipe and the floor surface at the bottom of the tank is maintained constant, and the variation in the ineffective remaining amount of fuel is eliminated. It has many advantages, such as being able to achieve the above-mentioned structure simply by providing a flexible portion and a spring.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a side view of the upstream part of the suction pipe, Fig. 2 is a plan view of the same, and Fig. 3 is a view similar to Fig. 1 of another embodiment. , FIG. 4 is a plan view of the same, and FIG. 5 is an explanatory longitudinal sectional side view of the entire fuel tank. In the drawing, 51 is a fuel tank, 1 is a suction pipe, 5 is a flexible portion, and 8 is a pressure means.

Claims (1)

[Scope of utility model registration request] The suction pipe housed in the tank is composed of an upstream part and a downstream part, and the two parts are connected by a flexible part, and the upstream part is pressed against the tank floor by a pressure means provided between the two parts. A fuel tank device for a vehicle, characterized in that a stopper portion is provided which is elastically biased and which abuts the bottom surface of the tank below the inlet end of the upstream portion.