JP2018123761A - Fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the delivery of high-temperature fuel returned from an engine to the engine.SOLUTION: A fuel tank 1 includes a storage part 10 for storing fuel, a delivery pipe 20 having a suction port 22 through which the fuel is sucked from the storage part 10, for delivering the sucked fuel to the engine, a return pipe 30 having an opening 32 from which the fuel returned from the engine drops into the storage part 10, and a shield wall 44 located between a drop point P for the fuel from the opening 32 and the suction port 22 for restricting the movement of the fuel into the suction port 22.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a fuel tank mounted on a vehicle.

A vehicle such as a truck is provided with a fuel tank for storing fuel supplied to the engine.
The fuel tank includes a storage portion that stores fuel, a delivery pipe that sucks the fuel stored in the storage portion and delivers the fuel to the engine, and a return pipe that returns excess fuel that has not been consumed by the engine to the storage portion. In addition, the fuel which returned to the accommodating part via the return pipe is then sent again to the engine via the delivery pipe.

JP 2009-108710 A

  By the way, the fuel returning to the accommodating portion through the return pipe passes through the engine and thus has a high temperature. If high-temperature fuel is sucked in by the delivery pipe and delivered again to the engine, there is a risk that a malfunction will occur in the engine. For example, when high-temperature fuel is delivered to the engine, the packing of the engine may cause thermal degradation.

  Therefore, the present invention has been made in view of these points, and an object of the present invention is to suppress delivery of high-temperature fuel returned from the engine to the engine.

In one aspect of the present invention, there is a housing portion that contains fuel, a suction port that sucks the fuel in the housing portion, a delivery pipe that delivers the sucked fuel to the engine, and a fuel that has returned from the engine Is disposed between the return point of the fuel from the opening and the suction port and restricts movement of the fuel to the suction port. A fuel tank is provided.
According to such a fuel tank, when the high-temperature fuel that has dropped from the opening of the return pipe to the drop point is diffused, it is difficult for the restricting portion to reach the suction port. In addition, when the fuel bypasses the regulating portion and reaches the suction port, it takes a long time, and the temperature of the fuel decreases. For this reason, it is possible to prevent the high-temperature fuel falling from the opening of the return pipe from being immediately sucked from the suction port and supplied to the engine.

  Moreover, the said control part is good also as a shielding board which is located around the said suction inlet and shields the movement to the said suction inlet of the said fuel.

  The fuel tank may further include a filter member attached around the suction port in the delivery pipe, and the restricting portion may be provided in the filter member.

  The filter member may be a cylindrical member, and the restricting portion may be an arcuate wall of the filter member.

  According to the present invention, it is possible to suppress the high-temperature fuel returned from the engine from being sent to the engine.

It is a figure for demonstrating an example of the external appearance structure of the fuel tank 1 which concerns on one Embodiment of this invention. 2 is a diagram for explaining an example of an internal configuration of a fuel tank 1. FIG. 4 is a diagram for explaining an example of a configuration of a filter member 40. FIG. It is a figure for demonstrating an example of the fixed state with respect to the delivery pipe | tube 20 of the filter member 40. FIG. It is a figure for demonstrating the case where the water level of the fuel in the accommodating part 10 is low. It is a schematic diagram for demonstrating an example of the diffusion from the dropping point P of a fuel.

<Configuration of fuel tank>
The configuration of the fuel tank 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  Drawing 1 is a figure for explaining an example of the appearance composition of fuel tank 1 concerning one embodiment. FIG. 2 is a diagram for explaining an example of the internal configuration of the fuel tank 1. In FIG. 1, the delivery pipe 20 in the fuel tank 1 is indicated by a broken line.

  The fuel tank 1 is mounted on a truck which is an example of a vehicle. The fuel tank 1 stores fuel supplied to an engine (not shown) of the vehicle. As shown in FIGS. 1 and 2, the fuel tank 1 includes a housing portion 10, a delivery pipe 20, a return pipe 30, an atmosphere release valve 35, and a filter member 40.

  The accommodating part 10 accommodates fuel. The accommodating part 10 has a box shape and has a space 12 for accommodating fuel therein. The fuel in the storage unit 10 is appropriately supplied from the fuel supply port. Although the accommodating part 10 accommodates light oil here, it is not limited to this, For example, you may accommodate gasoline.

  The delivery pipe 20 is a feed pipe that sucks the fuel in the housing 10 and delivers it to the engine. The delivery pipe 20 has a suction port 22 for sucking fuel at the tip. The delivery pipe 20 is fixed to the upper part of the accommodating portion 10 together with the return pipe 30. The delivery pipe 20 is disposed between the accommodating portion 10 and the engine, and a pump (not shown) for sucking fuel is provided in the middle.

  As shown in FIG. 1, the delivery tube 20 is bent in the housing portion 10. Specifically, the delivery pipe 20 is bent so that the suction port 22 is located at the lower center of the housing portion 10. For example, the delivery tube 20 has two bent portions 24 and 26. Thereby, for example, even when the water level of the fuel becomes oblique in the housing portion 10 during traveling of the vehicle, the fuel is easily sucked from the suction port 22.

  The return pipe 30 is a return pipe that returns the fuel that has not been consumed by the engine into the housing unit 10. The return pipe 30 has an opening 32 through which the fuel returned from the engine falls into the accommodating portion 10. In addition, since the fuel which falls into the accommodating part 10 from the return pipe 30 has passed through the engine, the temperature is higher than when it is supplied to the engine.

  The air release valve 35 is a valve for taking in air into the housing portion 10 to be equal to the atmospheric pressure or discharging it outside. By taking in air into the housing part 10, the inside of the housing part 10 is prevented from becoming negative pressure due to the suction of fuel by the pump, so that the fuel can be sucked in smoothly.

  The filter member 40 has a function of suppressing foreign matter in the fuel from being sucked from the suction port 22. Examples of the foreign matter include icing matter in which the moisture of the fuel is frozen at low temperatures, and dust.

  The filter member 40 is attached to the distal end portion of the delivery pipe 20 as shown in FIG. Specifically, the filter member 40 is a cylindrical member and is attached around the suction port 22 in the delivery pipe 20. The filter member 40 is fixed above the bent portion 24 of the delivery pipe 20 without using a fastening member such as a screw.

<Detailed configuration of filter member>
A detailed configuration of the filter member 40 will be described with reference to FIGS. 3 and 4.

  FIG. 3 is a diagram for explaining an example of the configuration of the filter member 40. FIG. 4 is a view for explaining an example of a fixed state of the filter member 40 with respect to the delivery pipe 20. In FIG. 4, the mesh 50 shown in FIG. 3 is omitted for convenience of explanation.

  The filter member 40 is made of resin. As shown in FIGS. 3 and 4, the filter member 40 includes a main body portion 42, a shielding wall 44, an insertion portion 45, a cylindrical portion 46, an extension portion 47, and a locking portion 48.

  The main body 42 is formed in a cylindrical shape as shown in FIG. That is, the main body 42 is positioned so as to surround the delivery pipe 20 (specifically, the suction port 22). The bottom surface 42a of the main body 42 faces the suction port 22 with a predetermined distance.

  As shown in FIG. 4, an opening 42 b is formed in the main body 42 along the circumferential direction. A mesh 50 (FIG. 3) is provided in the opening 42b. The mesh 50 is formed in a mesh shape and prevents passage of foreign matters in the fuel. For example, the mesh 50 prevents moisture from passing through at a low temperature.

  The shielding wall 44 is a portion where the mesh 50 is not provided in the main body portion 42, and is an arcuate wall on the side facing the fuel drop point from the return pipe 30 (see FIG. 2). The shielding wall 44 is located between the fuel drop point and the suction port 22, and has a function as a regulating unit that regulates the movement of the fuel that has dropped from the return pipe 30 to the suction port 22. Since the mesh 50 is not provided on the shielding wall 44, the shielding wall 44 is a shielding plate that shields the movement of the fuel that has fallen from the return pipe 30 to the suction port 22.

  The insertion part 45 is a part through which the delivery pipe 20 is inserted. The insertion portion 45 is formed with a through hole (not shown) through which the delivery tube 20 can be inserted. When the filter member 40 is attached to the delivery pipe 20, the insertion part 45 is inserted from the suction port 22 side of the delivery pipe 20. In addition, the diameter of the through-hole of the insertion part 45 is larger than the outer diameter of the delivery pipe | tube 20 so that the filter member 40 can be attached smoothly.

  The cylindrical portion 46 is a cylindrical portion that extends from the insertion portion 45 along the axial direction. As shown in FIG. 3, the cylindrical portion 46 is formed on both sides of the insertion portion 45 in the axial direction. By providing the cylindrical portion 46, the movement of the filter member 40 in the radial direction of the delivery pipe 20 can be restricted.

  As shown in FIG. 4, the extending portion 47 is a portion that extends in the axial direction from the main body portion 42. The extending portion 47 extends vertically upward from the cylindrical portion 46.

  As shown in FIG. 4, the locking portion 48 is provided on the distal end side of the extending portion 47 and is a portion locked to the delivery pipe 20. The locking portion 48 is locked to a portion (a portion above the bending portion 24) opposite to the suction port 22 when viewed from the bending portion 24 of the delivery pipe 20. The distal end of the locking portion 48 is hooked on the delivery pipe 20. In addition, when the latching | locking part 48 is hooked on the delivery pipe | tube 20, the latching | locking part 48 is perpendicular | vertical with respect to the part which the delivery pipe | tube 20 is caught. Thereby, the filter member 40 can be fixed to the delivery pipe 20 with a simple configuration.

<Diffusion of fuel dropped from return pipe 30>
In the fuel tank 1, the fuel that has not been consumed by the engine falls from the opening 32 of the return pipe 30 to the accommodating portion 10 and diffuses around the dropping point.
In the following, the mode of diffusion of the fuel dropped from the opening 32 in the storage unit 10 will be described by taking as an example a case where the fuel in the storage unit 10 is reduced as shown in FIG.

  FIG. 5 is a diagram for explaining a case where the water level of the fuel in the accommodating portion 10 is low. FIG. 6 is a schematic diagram for explaining an example of diffusion from the fuel drop point P. FIG. In FIG. 6, only the suction port 22 and the shielding wall 44 are shown for the delivery pipe 20 and the filter member 40 for convenience of explanation, and the others are omitted.

  In the state shown in FIG. 5, the fuel level is close to the position of the suction port 22. In such a case, the fuel that has fallen to the drop point P tends to go to the suction port 22 as compared with the case where the fuel level is high.

  On the other hand, in this embodiment, as shown in FIG. 6, since the shielding wall 44 exists between the drop point P and the suction port 22, the high-temperature fuel that has fallen to the drop point P immediately enters the suction port. Inhalation from 22 can be regulated.

In FIG. 6, the diffusion state of the fuel that has fallen at the dropping point P is indicated by a concentric circle of a one-dot chain line. That is, the fuel diffuses from the falling point P toward a circle with a large radius. At this time, since the shielding wall 44 is located on a line connecting the drop point P and the suction port 22, it is difficult for the diffusing fuel to reach the suction port 22. In particular, since the shielding wall 44 is formed in an arc shape around the suction port 22, it is possible to more effectively suppress the fuel from reaching the suction port 22.
Further, when the fuel at the drop point P bypasses the shielding wall 44 and reaches the suction port 22, the time until the fuel reaches the suction port 22 becomes longer. For this reason, the high-temperature fuel that has dropped to the drop point P is mixed with the fuel in the housing portion 10 with the passage of time, and the temperature decreases. As a result, high temperature fuel can be prevented from being sucked from the suction port 22.

  In the above description, the shielding wall 44 is provided on the filter member 40. However, the present invention is not limited to this. For example, the shielding wall 44 may be a member that is not provided in the filter member 40 and is fixed to the housing portion 10.

<Effect in this embodiment>
According to the embodiment described above, as shown in FIG. 5, the shielding wall 44 is located between the fuel drop point P from the opening 32 of the return pipe 30 and the suction port 22 of the delivery pipe 20. . The shielding wall 44 restricts the movement of the fuel from the drop point P to the suction port 22.
With the above configuration, when the high-temperature fuel that has dropped from the opening 32 to the drop point P diffuses, it is difficult to reach the suction port 22 by the shielding wall 44. Further, when the fuel bypasses the shielding wall 44 and reaches the suction port 22, it takes a long time, so the temperature of the fuel decreases. For this reason, it is possible to prevent the high-temperature fuel falling from the opening 32 from being immediately sucked from the suction port 22.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Fuel tank 10 Accommodating part 20 Delivery pipe 22 Suction port 30 Return pipe 32 Opening 40 Filter member 44 Shielding wall P Falling point

Claims (4)

A storage section for storing fuel;
A delivery pipe for sucking the fuel in the housing portion and delivering the sucked fuel to the engine;
A return pipe having an opening through which fuel returned from the engine falls into the housing;
A restricting portion that is located between the fuel drop point from the opening and the suction port and restricts the movement of the fuel to the suction port;
A fuel tank. The restricting portion is a shielding plate that is located around the suction port and shields the movement of the fuel to the suction port.
The fuel tank according to claim 1. A filter member attached around the suction port in the delivery pipe;
The restricting portion is provided on the filter member.
The fuel tank according to claim 1 or 2. The filter member is a cylindrical member,
The restricting portion is an arc-shaped wall of the filter member.
The fuel tank according to claim 3.

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