JPH0134698Y2 - - Google Patents

Description

[Detailed description of the invention] A. Purpose of the invention (1) Industrial application field The present invention relates to a fuel tank device installed in a vehicle such as an automobile.

(2) Conventional technology Conventionally, the ceiling wall of the fuel tank body has a structure consisting of an upper wall and a lower wall arranged in the longitudinal direction of the vehicle, and a stepped section connecting these upper and lower walls. is well known, and it is also known that a fuel reservoir with an open top is provided upright on the inner surface of the bottom wall of the fuel tank body, and a suction pipe connected to a fuel pump is inserted into the fuel reservoir.

(3) Problems to be solved by the invention If the ceiling wall of the fuel tank body has a step as described above, if the fuel oil level inside falls below the lower wall of the ceiling wall, the vehicle The launch of
When the fuel shakes back and forth due to stopping, sudden acceleration and deceleration, etc., and especially when it moves vigorously from the upper wall side of the ceiling wall to the lower wall side, the waves of this fuel hit the lower wall, producing a so-called waving sound. There are easy drawbacks.

In addition, in the case where the fuel reservoir as described above is installed upright on the bottom wall of the fuel tank body, when the remaining amount of fuel in the tank becomes low, it is possible to directly replenish the fuel in the tank from the open top surface of the fuel reservoir. It is difficult to do so, and the fuel oil level in the fuel reservoir tends to become low. Therefore, when the fuel oil level fluctuates due to starting, stopping, sudden acceleration and deceleration of the vehicle, etc., it is difficult to maintain sufficient fuel around the suction port of the fuel suction pipe. This problem is particularly noticeable when the fuel reservoir is displaced to one side in the front-back direction of the fuel tank body because the fuel oil level fluctuates rapidly. appears in

The present invention has been proposed in view of the above, and an object of the present invention is to provide a fuel tank device for a vehicle that can solve all the problems of conventional devices.

B. Structure of the invention (1) Means for solving the problem In order to achieve the above object, according to the invention, the ceiling wall of the tank body includes an upper wall and a lower wall arranged in the longitudinal direction of the vehicle; It is composed of a stepped portion connecting these upper and lower walls, and a fuel reservoir with an open top is erected on the inner surface of the bottom wall of the tank body,
In this fuel tank device for a vehicle, in which a suction pipe connected to a fuel pump is inserted into the fuel reservoir, the fuel reservoir is arranged at approximately the center in the front-rear direction of the tank body, and the inner surface of the bottom wall of the tank body has the stepped portion. Or below the vicinity thereof, there is provided a deflecting plate that is inclined upwardly from the lower wall side to the upper wall side, and the deflecting plate has both halves facing one side in the longitudinal direction of the vehicle and has a wide-end shape. Along with being formed,
The fuel reservoir is arranged in a narrow portion between the two halves.

(2) Effect When the remaining amount of fuel in the fuel tank becomes low, this function prevents the flow of fuel from the upper wall side to the lower wall side that occurs in the tank due to starting, stopping, acceleration/deceleration, etc. of the vehicle. The baffle plate can effectively attenuate the fuel flow by reversing it toward the upper wall, thereby avoiding the collision of the fuel flow with the lower wall and preventing the so-called waving noise caused by the collision. In addition, the reversed flow is guided by the two halves of the baffle plate arranged in a diverging shape, and is collected in the narrow part of the two halves, and its momentum allows it to easily overcome the upper edge of the fuel reservoir. The fuel is refilled inside the fuel tank smoothly, making use of the back-and-forth flow of fuel that frequently occurs within the fuel tank when the vehicle starts, stops, accelerates and decelerates, etc., and replenishes the fuel into the fuel reservoir when the oil level fluctuates. Replenishment can be carried out efficiently and sufficiently.

In addition, the fuel reservoir is located approximately at the center of the fuel tank body in the longitudinal direction, where the amount of oil level displacement is the smallest in response to longitudinal fluctuations of the fuel in the tank.
The replenishment of fuel to the fuel reservoir is more reliably performed. Moreover, since the fuel reservoir is located in the narrow part between the two halves of the diverging baffle plate, the baffle plate There will be no interference.

(3) Embodiment An embodiment of the present invention will be described below with reference to drawings. First, in FIG. 1, a fuel tank T is disposed on the floor plate of a vehicle body, directly below a seat support F that supports a rear seat Sr. . The seat support part F is formed in a step shape along the bottom shape of the rear seat Sr so that the front part Fa is higher and the rear part Fb is lower. It is also formed in steps. That is, the ceiling wall 1 includes an upper wall 1a close to the front half Fa of the seat support F, a lower wall 1b close to the rear half Fb, and both walls 1.
It is composed of a step portion 1c connecting between a and 1b. In this fuel tank T, a baffle plate 2 and a fuel reservoir 3 are disposed below the step portion 1c or near the step portion 1c as follows.

As shown in FIGS. 2 and 3, the deflector plate 2
stands up from the inner surface of the bottom wall 4 of the tank body of the fuel tank T, and extends from the lower wall 1b side of the ceiling wall 1 to the upper wall 1a.
It is formed so that it slopes upward toward the side,
In addition, the left and right halves 2a and 2b of the baffle plate 2 are arranged on one side in the longitudinal direction of the vehicle, in the illustrated example, on the front side (the upper wall 1a
It is bent to widen toward the side.

The baffle plate 2 has a plurality of mounting pieces 5 arranged at intervals at its lower end, which are attached to the bottom wall 4 of the fuel tank T.
It is supported by welding on top, and its upper end is spaced appropriately from the ceiling wall 1. The deflecting plate 2 has
A plurality of through holes 6 are provided in the middle of the inclined surface, and a plurality of notches 7 are provided in the lower end, through which fuel can flow forward and backward of the baffle plate 2.

The fuel reservoir 3 has a cup shape with its upper surface open at a mid-height position of the deflector plate 2, and is located in the narrow part between the left and right halves 2a and 2b of the deflector plate 2, and approximately in the center of the tank body in the front-rear direction. It is fixed onto the bottom wall 4 of the fuel tank T via a mounting ring 8. That is, a mounting ring 8 is welded to the lower outer periphery of the fuel reservoir 3, and a flange 9 at the lower end of the ring 8 is welded to the bottom wall 4.

An annular passage 10 is provided between the fuel reservoir 3 and the mounting ring 8.
In order to communicate the inside of the fuel reservoir 3 and the outside of the attachment ring 8 via this passage 10, one or more small holes 11, 12 are bored in the lower part of each of the fuel reservoir 3 and the attachment ring 8. will be established. At this time, these small holes 11 and 12 are provided so as to be largely shifted from each other in the circumferential direction of the fuel reservoir 3 and the attachment ring 8.

A suction pipe 13 connected to a fuel pump (not shown) is inserted into the fuel reservoir 3, and a filter 14 is attached to the suction port.

Note that in the figure, arrow A indicates the front of the vehicle.

Next, the operation of this embodiment will be explained. The fuel in the fuel tank T is stored in the fuel reservoir 3 and is sucked up from the suction pipe 13 and supplied to the engine. When the fuel is consumed and the oil level O drops below the lower wall 1b of the ceiling wall 1 as shown in FIG. The vibration is attenuated by the resistance of the baffle plate 2. Moreover, since the deflecting plate 2 is inclined upwardly from the lower wall 1b side to the upper wall 1a side as described above, when the fuel flows forcefully from the upper wall 1a side to the lower wall 1b side, the deflection plate 2 The direction of the flow is reversed toward the upper wall 1a by the slope of the baffle plate 2, as indicated by the arrow in the figure. Therefore, the fuel is prevented from hitting the lower wall 1b and making noise. Since the upper wall 1a is located at a relatively high position, the fuel turned toward it is attenuated before reaching the upper wall 1a.

When the oil level O drops to below the upper open surface of the fuel reservoir 3, the fuel around the fuel reservoir 3 usually flows into the small hole 1.
2, the fuel reservoir 3 through the annular passage 10 and the small hole 11
Therefore, the fuel reservoir 3 is not depleted. Furthermore, even if the fuel swings back and forth significantly as the vehicle starts, stops, accelerates and decelerates as described above, and the fuel outside the fuel reservoir 3 moves to one side of the fuel tank T, the fuel The fuel in the reservoir 3 is retained almost unchanged in the fuel reservoir 3 due to the flow path resistance of the small holes 11 and 12 and the annular passage 10. Moreover, when the fuel outside the fuel reservoir 3 moves vigorously from the upper wall 1a side to the lower wall 1b side, the fuel is guided to the left and right halves 2a and 2b of the baffle plate 2, which are arranged in a manner that spreads out toward the end. The fuel is collected in the narrow parts of both halves 2a and 2b, and with its momentum, it easily overcomes the upper edge of the fuel reservoir 3 and is stored therein. Therefore, the oil level in the fuel reservoir 3 is maintained higher than the surrounding oil level, and fuel is reliably supplied to the engine.

C. Effects of the invention As described above, according to the invention, the ceiling wall of the tank body is composed of an upper wall and a lower wall arranged in the longitudinal direction of the vehicle, and a stepped section connecting these upper and lower walls. In a fuel tank device for a vehicle, a fuel reservoir with an open top is installed on the inner surface of the bottom wall of the tank body, and a suction pipe connected to the fuel pump is inserted into the fuel reservoir. A deflector plate is disposed substantially in the center in the front-rear direction, and is erected on the inner surface of the bottom wall of the tank body, and is inclined upwardly from the lower wall side to the upper wall side below the step portion or the vicinity thereof. This baffle plate has both halves formed in a shape that widens toward one side in the longitudinal direction of the vehicle, and is arranged so that the fuel reservoir is located in the narrow part between the two halves, so that the fuel tank When the amount of fuel remaining in the tank is getting low, use a baffle plate to prevent the flow of fuel from the upper wall to the lower wall that occurs in the tank due to starting, stopping, acceleration/deceleration, etc. of the vehicle. It is possible to effectively attenuate the fuel flow by reversing it toward the upper wall, thereby avoiding collision of the fuel flow with the lower wall, and preventing the generation of so-called waving noise due to the collision. Therefore, it does not cause discomfort to the passengers.
Furthermore, the reversed flow is guided by the two halves of the deflector plate arranged in a diverging manner, and is collected in the narrow part of the two halves, and with its momentum, it easily overcomes the upper edge of the fuel reservoir and enters the inside thereof. Because it is replenished smoothly,
Utilizing the forward and backward flow of fuel that frequently occurs in the fuel tank when the vehicle starts, stops, accelerates and decelerates, etc., it is possible to efficiently and sufficiently replenish the fuel reservoir when the oil level fluctuates. Therefore, even when the oil level fluctuates, there is no risk that the fuel suction action of the suction pipe will be interrupted.
Fuel can be stably supplied to the engine.

In addition, the fuel reservoir is located approximately at the center of the fuel tank body in the longitudinal direction, where the amount of oil level displacement is the smallest in response to longitudinal fluctuations of the fuel in the tank.
The replenishment of fuel to the fuel reservoir is more reliably performed. Moreover, since the fuel reservoir is located in the narrow part between the two halves of the diverging baffle plate, the baffle plate There will be no interference.

Furthermore, the deflection plate described above can be used both as a collision prevention wall that prevents the fuel flow inside the tank from colliding with the tank wall, and as a guiding wall that efficiently collects the fuel flow into the fuel reservoir, which makes the structure simpler. This can contribute to cost reduction and improved assembly efficiency.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of an automobile fuel tank and its surrounding area based on an embodiment of the present invention, Fig. 2 is an enlarged longitudinal sectional side view of the fuel tank, and Fig. 3 is a partially cutaway view of the fuel tank. FIG. T... Fuel tank, 1... Ceiling wall, 1a... Upper wall, 1b... Lower wall, 2... Deflector plate, 2a,
2b...Left, right half, 3...Fuel reservoir, 4...Bottom wall, 13...Suction pipe.

Claims (1)

[Scope of utility model registration request] The ceiling wall of the tank body is composed of an upper wall and a lower wall arranged in the longitudinal direction of the vehicle, and a stepped part connecting these upper and lower walls, and the inner surface of the bottom wall of the tank body has an open top wall. In a fuel tank device for a vehicle in which a fuel reservoir is installed upright and a suction pipe connected to a fuel pump is inserted into the fuel reservoir, the fuel reservoir is arranged approximately in the center of the tank body in the front-rear direction, and the fuel reservoir is located at the bottom wall of the tank body. A deflecting plate is provided on the inner surface below the stepped portion or the vicinity thereof, and is inclined upwardly from the lower wall side to the upper wall side, and both halves of the deflecting plate are located at the front and rear of the vehicle. A fuel tank device for a vehicle, characterized in that the fuel tank device is formed in a shape that widens in one direction, and the fuel reservoir is located in a narrow portion between the two halves.