JPH0357873A - Fuel supply device for vehicle - Google Patents

Abstract

PURPOSE:To spread a suction area of fuel so as to improve its improper suction by housing a flexible filter chamber, having a bottom surface of area larger than the opening part of a fuel tank, in its internal part with the filter chamber contracted in the opening part of the fuel tank. CONSTITUTION:A fuel tank is formed by housing a subtank 6 in the interior of a main tank 2. While an electrically-driven fuel pump 40 is housed in the inside of the subtank 6. Further a filter chamber 8 is arranged in the bottom part of the subtank 6. Here a bottom surface of the filter chamber 8 is arranged almost parallelly to the bottom surface of the main tank 2, while an area of the bottom surface of this filter chamber 8 is set larger than the area of an opening part in the main tank 2. Now a mesh material 8b, by which the filter chamber 8 is formed, is contracted in the opening part of the main tank 2, thereafter the mesh material is expanded to the original shape by a deformation- preventing material 8a in the inside of the main tank 2.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel supply system installed in a vehicle, and particularly relates to a fuel supply system that supplies a constant amount of fuel to the engine side without being affected by the movement of fuel in the fuel tank due to acceleration etc. The present invention relates to a fuel supply device capable of pumping out fuel under pressure, and capable of reducing the amount of ineffective fuel remaining when the fuel in the fuel tank approaches empty.

[Prior Art] Recently, fuel tanks for vehicles have tended to become thinner due to car design. When the fuel in such a fuel tank becomes low and the vehicle accelerates suddenly, or when driving around a curve or slope, the fuel tends to lean to one side of the tank.
The fuel pump suction port may be exposed from the fuel.

The suction port is equipped with a filter for fuel filtration, but as the filter material tends to form a lump of fuel, it is recommended to use a filter material that allows fuel to be sucked even if a portion is exposed. In many cases, this is useful to prevent empty pumping of fuel. By the way, the fuel tank has an opening for installing an a-fuel pump, a filter, etc. However, since the fuel tank is required to have strength particularly for safety reasons, the opening portion is generally only provided at N1 to the minimum extent necessary. Therefore, the size of the filter must be such that it can pass through this opening, and its shape is necessarily limited to a small size. Also, if you want to increase the cross-sectional area of the filter with a size that can pass through the opening of the fuel tank, you should make a long and thin filter and pass it through the opening while tilting it so that the filter is parallel to the bottom of the fuel tank when assembled. is possible. Japanese Unexamined Patent Publication No. 47-21
The one described in the 843 bow publication shows an example of this.

[Problems to be Solved by the Invention] However, if the filter is smaller than the opening area of the fuel tank, the entire filter is likely to be exposed due to the inclination of the fuel tank. In addition, when making a long and thin filter to reduce the filter area compared to the opening area, when the fuel tank is tilted in the long direction, it is difficult to expose the entire fuel tank, but when the fuel tank is tilted in the short direction, it is difficult to expose the entire fuel tank. The entire area becomes easily exposed. In any case, since the entire fuel is likely to be exposed, a large amount of fuel remains in the fuel tank pile without being pumped out, or in other words, a large amount of invalid fuel remains.

The present invention is based on the above knowledge, and aims to solve the problems of preventing the entire filter from being exposed to prevent empty fuel from being pumped out, and to reduce the amount of invalid fuel stored in the fuel tank. be.

F stage 1 for solving problem 1 The above problem is solved by a vehicle fuel supply system having the following parts structure.

The vehicle fuel supply device has a fuel tank. The fuel tank is mounted on an object that is subject to acceleration, such as a vehicle, and has an opening at the top.

It has a filter chamber. The filter chamber is formed of a filter chamber component that can suck fuel even if a portion thereof is exposed, and filters and stores fuel viscosity in the fuel tank.

It also has a fuel pump. A fuel pump sucks fuel in the filter chamber.

The filter chamber has a bottom surface that is substantially parallel to the bottom surface of the fuel tank, and the area of the bottom surface of the filter chamber is larger than the area of the 17fl port of the fuel tank, and the filter chamber has a bottom surface that is substantially parallel to the bottom surface of the fuel tank. The N part shrine has the flexibility to pass through the opening of the fuel tank in a contracted state and return to its original shape when installed inside the fuel tank.

[Function] In the fuel supply device for a vehicle having the above means, since the filter chamber constituent member has flexibility, it passes through the opening of the fuel tank in a contracted state, and returns to its original shape after passing through. Since it returns to its original position, it is possible to provide a larger bottom area of the filter than the fuel tank opening. This increase in filter depth makes it difficult for the entire filter chamber to be exposed from the fuel. In addition, since the filter is free from the long and narrow filter shape, if the filter chamber is wide and has a circular bottom, the entire filter chamber will be difficult to mist no matter which direction the fuel is tilted.

[Examples] Examples will be specifically described below with reference to the drawings. 1st
The figure is an overall view of the installation of the fuel supply system U for a vehicle according to the present invention, and FIGS. 2 to 4 show a first embodiment of the present invention.

This embodiment is an application example in which the fuel tank includes a main tank and a sub-tank disposed within the main tank.

2 in the figure is the main tank, which stores fuel to be sent to the engine.

6 in the figure is a sub tank. The fuel tank 6 is a cylindrical right-bottom container, and is used to store one square of fuel using a method to be described later. The sub-tank 6 itself is fixed to the flange iron plate 3 with bolts 1. Then, the flange iron plate 3 is fixed to the main tank 2 with bolts 1- through a gasket 4.

Main tank 2 closed by this flange iron plate 3
The portion corresponding to the upper opening is the substantially circular space [ ] portion of the fuel tank described in the claims.

An electric fuel pump 40 (see iδ0 in FIG. 2) is sunk in the sub-tank 6 for pumping fuel to the engine.

The material 1d of the sub-tank 6 is a resin (bolyamide, polyacetal, etc.).

8 in the figure is a filter chamber. The filter chamber 8 is located below the sub-tank 6, and functions to filter and store the fuel in the main tank 2, and to store fuel overflowing from the six-nab tank 6, which will be described later. The filter chamber 8 is a chamber surrounded by a mesh material 8b in which a liquid film of fuel is likely to form, and has an opening at the top. An annular member 8C for attachment is fixed to this opening edge,
The opening of the filter chamber 8 formed by the annular member 8C is fixed so as to surround the bottom surface of the sub-tank 6.

The fixing method is to fit a convex portion 6a provided on the outer peripheral portion of the bottom surface of the sub-tank 6 into a concave portion 8d of an annular member 8C forming an opening of the filter chamber 8.

The bottom surface of the filter chamber 8 is parallel to the bottom surface of the main tank 2 and has a circular shape. The diameter of the circle is larger than the diameter of the opening of the filter chamber 8 itself, and also larger than the diameter of the upper opening of the main tank 2.

The material of the mesh material 8b constituting the filter chamber 8 is nylon thread, which is cut into a shape.

Here, the warp is a bundle of 34 fine threads, equivalent to 210 denier, and is woven into 1111 of 1 inch, and the weft is 220 denier, which is 163 denier in a width of 1 inch. 1. This is included in the book. Therefore, this mesh U8b is located in the filter chamber 8 where a liquid film of fuel is easily formed.
When the entire tank is filled with fuel r1, there is no possibility that the fuel inside will flow back to the main tank 2 side. Furthermore, since the material is nylon, the filter chamber 8 can be deformed to some extent. Here, the nylon mesh material 8b is in contact with each other.
A (Connections between the bottom part and the side wall parts) are made by welding.

In the figure, reference numeral 88 denotes a deformed retaining member for securing the vertical shape of the filter chamber 8. The deformable stopper material 8a serves to keep the mesh material 8b constituting the filter chamber 8 in a state where it is expanded to its maximum extent, and also prevents deformation when it is charged into the main tank 2 from the upper opening. The function of returning the mesh material 8b to its original shape is to prevent deformation due to negative pressure when the electric fuel pump 40 pumps fuel in the filter chamber 8 during use. It is for the purpose of

The deformation prevention material 8a is required to be elastically deformed in response to the force applied when the filter chamber 8 is inserted into the main tank 2, and to have relatively high rigidity when restored to its original shape. In consideration of this condition, a thin stainless steel spring plate or a polyamide resin spring plate is generally used as the material, but coarse sponge or the like may also be used.

In this embodiment, the deformation prevention material 88 is also a part of the filter chamber structure or member having flexibility, together with the mesh material 8b described above.

A detailed plan view of the filter chamber 8 is shown in FIG.

Here, FIG. 3 is a view taken along arrows 1 and 2 in FIG.

In this embodiment, the deformation prevention material 8a spreads in a circular shape from the center in the circumferential direction in order to maintain the circular bottom shape of the filter chamber 8, and furthermore, as shown in FIG. It is curved at the top and bottom to ensure the desired thickness.

The filter chamber 8 has a side wall passage 10 and a sub tank opening/closing valve 12.
It communicates with Subtank 6 at two locations.

The electric fuel pump 40 functions to send +f of fuel in the filter chamber 8 to the engine side. In the figure, 50 is a pump section of the electric fuel pump 40. The pump section 50 consists of two units.
A Sco pump is connected in series with respect to the flow direction.

A fuel suction port 42 of the electric fuel pump 40 passes through the bottom of the sub-tank 6 and communicates with the filter chamber 8 . Cushion rubber 41 is interposed in the insect passage portion in consideration of sealability and shock resistance. The fuel suction bow [142] protrudes slightly into the interior of the filter chamber 8 so as not to suck in air bubbles that may be trapped in the upper part of the filter chamber 8. Further, the fuel discharge port 44 of the electric I#I fuel pump 40 is connected to a fuel supply vibe 46 that supplies fuel to the engine side with a rubber hose 43 to ensure vibration resistance and compatibility. The fuel discharge port 44 and the connection point between the fuel supply vibrator/16 and the rubber hose 43 are firmly fixed with clips 45.

In the figure, numeral 30 is a return fuel vibrator that guides the fuel that is sent to the engine and returned without being consumed by the J3 engine into the sub-tank 6.

The above-mentioned side wall passage 10 is a vibration-shaped passage for regulating the fuel level in the sub-tank 6 to a predetermined level, and has one end open at a predetermined level in the upper part of the sub-tank 6, and has an opening inside the filter chamber 8. The other end is open. Therefore, if the fuel level in the sub-tank 6 attempts to rise above the opening of the side wall passage 10, the fuel will overflow and flow into the filter chamber 8 through the side wall passage 10.

The material of the side wall passage 10 is the same as that of the sub tank 6.

In the figure, 12 is a 1-nab tank opening/closing valve. The sub-tank opening/closing valve 12 closes a flow path that communicates the sub-tank 6 and the filter chamber 8 during steady running, and opens when the vehicle is accelerated or the sub-tank 6 is tilted.

In the figure, 60 is a relief valve. relief valve 60
is attached to a flow path that branches off from the middle of the communication flow path of two Wesco pumps connected in series, and when the fuel pressure in the communication flow path reaches a predetermined level or more, the connection is activated. A portion of the fuel in the flow path is released into the one-knob tank 6.

Next, the overall flow of fuel will be explained.

The electric fuel pump 40 sucks the fuel in all the filters 8. Here, the fuel h in the rib tank 6 (if empty, fuel is not supplied from the rib tank 6 to the filter chamber 8, and the fuel that has passed through the mesh material 8b from inside the main tank 2 flows into the filter chamber 8). In general, the electric fuel pump 401 is designed to be able to send fuel at a certain pressure to the engine even if the battery voltage is low when starting the engine.For this reason, it is normally When the battery is in use and the battery has returned to normal, the fuel pressure applied to the relief valve 60 will exceed a predetermined pressure. Therefore, a portion of the fuel will be released from the relief valve 60 into the sub-tank 6. Furthermore, the difference between the fuel pumped to the engine by the electric fuel pump 40 and the fuel consumed by the engine is returned from the engine to the rib tank 6 through the return diagonal pipe 30.This return fuel is It is a fuel in which a portion of the low boiling point has been removed at high temperature, and almost no vapor is generated.Therefore, as the operation continues, the relief valve 60 gradually closes in the subtank 6.
The fuel from the engine and the fuel returned from the engine will accumulate. When the fuel accumulated in the sub-tank 6 is about to exceed a predetermined level, the fuel overflows and flows into the filter chamber 8 through the side wall passage 10.

As is clear from FIG. 2, since the fuel from the sub-tank 6 does not pass through the mesh material 8b, the fuel flowing from the electric fuel pump 40 is larger than that from the main tank 2 through the mesh material 8b to the filter chamber 8. The suction resistance is small, so the electric fuel pump 40 suctions the fuel overflowing from the small sub-tank 6 of the suction paper tube and pumps it to the engine side.

Furthermore, according to this structure, even when the fuel in the main tank 2 is low and the vehicle runs on a slope or curve, the fuel surface 'a' is frequently tilted, the filter chamber 8 is a shaped room with a wide base,
The entire filter chamber 8 is rarely exposed from the fuel liquid level. In addition, since the mesh material 8b tends to prevent fuel liquid from forming, the fuel inside the filter chamber 8 does not flow back toward the main tank 2 side. Furthermore, since the bottom of the filter 8 is wide, fuel can be sucked from a wide range within the main tank 2, and the amount of invalid fuel remaining within the C main tank 2 that is not pumped to the engine is also reduced.

Since the fuel in the V-tank 6 flows into the filter v8 when the sub-tank opening/closing valve 12 is turned on, it is possible to cope with the exposure of the filter chamber 8 for a fairly long period of time.

This is a diagram showing the state when the sub-tank 6 and filter rod 8 are inserted into the main tank 2 from the upper part of the main tank 2. Here, the upper opening of the main tank 2 is the diameter of the sub-tank 6. It is made larger than the original.

In the figure, reference numeral 80 denotes a charging nod, which covers the edge of each of the seven parts and one mouth of the main tank 2, so that a trumpet-shaped, substantially circular solid guide is vertically divided into two. This is used to avoid damaging the mesh material 8b when inserting the filter chamber 8 into the main tank 2, and is removed once the filter chamber 8 passes through the opening.

5 to 7 show a second embodiment of the present invention.

In the case of this embodiment, the structure of the deformation prevention material 8a of the filter chamber 8 used in the first embodiment is modified. Therefore, the effects of this embodiment are almost the same as those of the first embodiment.

A detailed plan view of the filter chamber 9 is shown in FIG.

In this embodiment, the U-deformation prevention member 9a extends radially outward and downward from the outer periphery of the bottom surface of the sub-tank 6. The thickness of the filter chamber 9 is ensured by the downward inclination of the deformation prevention member 19a. The material of the deformation prevention shrine 9a is polyamide resin.

Here, the connection between the deformation preventing portion 449a and the annular member 9C forming the opening of the filter chamber 9 is performed by ultrasonic melting.

Figure 7 is a diagram showing the state when charging the sub-tank 6 and filter v9 into the main tank 2 from the upper opening. This is Genai and 14th case of the 1st Miura case.

[Effects of the invention] According to Mokaki, even if the fuel in the fuel tank is tilted, the bottom area of the filter chamber is wider than the front face of the fuel tank, so poor fuel suction can be corrected, and the fuel The amount of useless fuel remaining in the tank decreases. Also, if the shape of the bottom of the filter is circular, etc., and the length of one culm is determined by the length of one bean, the entire grain will be exposed no matter what direction the burnt rice is tilted. Therefore, it is effective in preventing empty fuel pumping and reducing ineffective fuel.

[Brief explanation of drawings]

Fig. 1 is an overall view of the installation of the vehicle fuel supply system according to the present invention, Fig. 2 is a detailed cutaway view of the sub-tank and filter chamber according to the first embodiment of the present invention, and Fig. 3 is the present invention. FIG. 4 is a detailed plan view of the filter chamber according to the first embodiment of the present invention, FIG. Detailed sectional view of the sub-tank and filter chamber according to the embodiment, No. 6
The figure is a detailed plan view of the filter chamber according to the second embodiment of the present invention, and FIG. 7 is a diagram showing the state in which the sub tank and the filter chamber are loaded into the main tank according to the second embodiment of the present invention. 2 Main tank 6 Sub tank 8 Filter chamber 8a Deformation prevention member 9 Filter chamber 9a Deformation prevention member 40 Electric fuel pump

Claims (1)

[Claims] The fuel tank is mounted on an object that is subject to acceleration such as a vehicle, and is formed by a fuel tank having an opening at its upper part, and a filter chamber component that can suck fuel even if a part of the fuel tank is exposed. It has a filter chamber that filters and stores the fuel in the fuel tank, and a fuel pump that sucks the fuel in the filter chamber, and the filter chamber has a bottom surface that is substantially parallel to the bottom surface of the fuel tank. The area of the bottom surface is larger than the area of the opening of the fuel tank, and the filter chamber component passes through the opening of the fuel tank in a contracted state, and when installed inside the fuel tank, the filter chamber component passes through the opening of the fuel tank. A vehicle fuel supply device characterized by having flexibility to return to its shape.