JP4787703B2 - Misfueling structure for vehicle fuel tank - Google Patents

Description

  The present invention relates to an erroneous fueling prevention structure for a vehicle fuel tank used in a vehicle equipped with a main tank that stores main fuel and a subtank that stores auxiliary fuel for starting.

  In recent years, biofuels such as ethanol (ethyl alcohol) produced from sugarcane, corn, sugar beet, wheat, etc. as vehicle fuel that can be used as a substitute for oil and sustainable use in response to global environmental measures and rising oil prices. Fuel is drawing attention. As what uses such a fuel for vehicles, the carburetor for various fuels indicated by patent documents 1 is known, for example.

  In addition, there is known a mixed fuel in which alcohol (ethanol) and gasoline are mixed, or a so-called FFV (Flex Fuel Vehicle) capable of running only with alcohol.

In a vehicle equipped with such a fuel supply device, a low vaporization fuel such as alcohol is used as a main fuel. Therefore, a good vaporization property can be used instead of the main fuel during low temperature start-up or warm-up with poor vaporization. Using secondary fuel (gasoline) or increasing the concentration of secondary fuel in mixed fuel.
Japanese Patent Publication No. 3-41670 (drawing)

  However, the vehicle using the main fuel and the auxiliary fuel as shown in Patent Document 1 includes two types of fuel tanks, a main tank for storing the main fuel and a sub tank for storing the auxiliary fuel, and each tank. Since the types of fuel stored in the tanks are different, the number of fuel filler ports is two according to the number of tanks. For example, when these two fuel filler openings are arranged side by side, there is a risk that fuel may be mistakenly fed.

  In the FFV, the main fuel refueling port of the main tank may be disposed on the rear side surface of the vehicle body, and the sub fuel refueling port of the sub tank may be disposed in the engine room. In the engine room, in addition to the sub tank, a plurality of caps for closing the liquid replenishing ports of other tanks such as a washer tank and a reservoir tank are arranged.

  As a result, there is a possibility that the sub fuel supply port of the sub tank and the liquid replenishment port for replenishing other tanks with other liquids may be mistakenly supplied. Further, there is a possibility that the cap of the opened auxiliary fuel filler port and the cap of the liquid replenishing port for replenishing other liquids are mistakenly attached.

  Accordingly, the present invention has been invented to solve the above-mentioned problems, and mistakes are made in the sub-tank start-up sub fuel supply port, the main tank main fuel supply port, and other liquid replenishment ports. It is an object of the present invention to provide an erroneous fueling prevention structure for a vehicle fuel tank that prevents refueling.

In order to solve the above problem, the erroneous fueling prevention structure for a vehicle fuel tank according to claim 1 stores a main tank that stores main fuel, a volume smaller than the main tank, and stores a starting sub fuel. A sub-tank, the main tank mounted on the vehicle and other tanks other than the sub- tank, a main cap that closes the main fuel filling port of the main tank, and a start tank formed at the end of the sub-tank body of the sub-tank Incorrect fueling prevention for a vehicle fuel tank, comprising: a sub-cap that is directly attached to the auxiliary fuel filler opening and closes the starting auxiliary fuel filler opening; and another cap that closes the liquid replenishment opening of the other tank. The main fuel filler port is installed on one side surface of the vehicle body, and the starting sub fuel filler port is installed on the other side surface of the vehicle body. Is, wherein the vehicle body, on one side, said the main fuel lid placed to cover the main cap, the other side surface, the sub-fuel lid for covering the sub-cap is installed, at least of the main cap and the sub cap On one side, a warning display for preventing misfueling is provided, the main cap and the sub cap each have a male screw portion and an outer peripheral edge, and the other caps have a female screw portion, The opening end of the main fuel filling port and the opening end of the starting auxiliary fuel filling port have a larger diameter at the opening end of the starting auxiliary fuel filling port, and when the main cap is assembled to the sub tank filling port, The outer peripheral edge of the main cap interferes with the opening end .
Here, the main fuel is a fuel mainly used for driving the engine, and is, for example, alcohols or a mixed fuel of alcohols and gasoline. The auxiliary fuel for start-up is a fuel that is used when the main fuel is not used, and is, for example, gasoline having better vaporization than the main fuel.

According to the first aspect of the present invention, in the vehicle, the main fuel lid is installed on one side surface of the vehicle body, and the sub fuel lid is installed on the other side surface of the vehicle body. Therefore, it does not give a complicated impression and does not impair the appearance of the vehicle.
In the vehicle, the main fuel filler port is installed on one side of the vehicle body, and the auxiliary fuel filler port for starting is installed on the other side of the vehicle body. The refueling port and the starting auxiliary fuel refueling port are located in the same place, making it impossible to refuel. For this reason, it is possible to prevent the main fuel refueling port and the starting sub fuel refueling port from being mistakenly refueled. In other words, when one person replenishes fuel from the two refueling ports of the main fuel refueling port and the starting sub fuel refueling port, it is possible to replenish unless he walks around the vehicle and moves to the opposite side. Incorrect oiling can be prevented.
Further, the sub-cap of the sub-tank is covered with the sub-fuel lid, so that, for example, even if there is a cap of another liquid supply port around the sub-cap, the sub-cap and the cap of the other liquid supply port Due to the difference in the arrangement state around the two, the two can be easily distinguished. As a result, it is possible to prevent the sub cap and the cap of the other liquid supply port from being attached by mistake or misfueling.

Further , according to the first aspect of the present invention, at least one of the main cap and the sub cap includes, for example, characters such as “for alcohol”, “for gasoline”, “for front tank”, “for rear tank”, etc. A warning display to prevent mis-lubrication such as marks. As a result, the main fuel refueling port to which the main cap is attached is a replenishing port dedicated to the main fuel, and the starting sub fuel refueling port to which the sub cap is attached is a replenishing port dedicated to the starting sub fuel. You can confirm that.

Further, according to the invention described in claim 1, the sub-cap and main cap, since by being formed so as incompatible mounting, it is not possible to attach interchanged, and the sub-cap It is possible to prevent the main cap from being attached by mistake.

Further, according to the invention described in claim 1, the outer peripheral edge of the main cap, by being formed that interfere with the diameter at the opening end of the starting secondary fuel filler opening, the secondary fuel filler opening for starting the main cap When it is going to be attached to, the outer peripheral edge of the main cap interferes with the opening end of the starting auxiliary fuel filling port and cannot be closed. For this reason, the main cap is not mistakenly attached to the auxiliary fuel supply port for starting the sub tank.

  According to the erroneous fueling prevention structure for a vehicle fuel tank of the present invention, it is possible to prevent the fueling port of the sub-tank, the fueling port of the main tank, and the other liquid replenishing port from mistakenly supplying the wrong fuel. Further, it is possible to prevent the caps from being replaced with the wrong caps after being replaced.

With reference to FIGS. 1-10, an example of the erroneous fueling prevention structure of the vehicle fuel tank which concerns on embodiment of this invention is demonstrated. FIG. 1 is a diagram showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is a schematic diagram showing the installation positions of a main tank, a sub tank, a main cap and a sub cap in the vehicle.
First, prior to describing the erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, the connection relationship between the vehicle C, the main tank T1, the sub tank T2, and the piping provided with this structure. Will be described.

≪Vehicle configuration≫
As shown in FIG. 1, a vehicle C has a main tank T1 in which main fuel such as alcohol used mainly or a mixed fuel such as alcohol and gasoline is stored in normal time, and other items such as during cold start and during warm-up. The type and shape of the vehicle C are not limited as long as the vehicle has a subtank T2 in which a starting subfuel such as gasoline used in this case is stored. That is, the vehicle C may be a passenger car, a bus, a work vehicle, or the like. For example, when the main fuel filling port 3a of the vehicle C serving as the base is on the left side, the starting sub fuel filling port T2a is disposed on the right side of the vehicle body B. Hereinafter, the case of a passenger car in which the sub tank T2 is installed on the right side of the vehicle body B will be described as an example.

  The vehicle C is equipped with respective tanks for storing a plurality of types of liquids, and is provided with an erroneous fueling prevention structure for the fuel tanks (T1, T2) for preventing erroneous fueling. The vehicle C is, for example, a so-called center tank vehicle in which a main tank T1 is disposed below the front seat. In such a vehicle C, the main fuel supply port 3a is disposed on the rear side of the rear seat, and the main fuel supply port 3a and the main tank T1 are connected by the filler pipe 3 and the breather pipe 4. In the vehicle C, a part of the floor panel is formed low so that the rear seat can be folded flat with respect to the luggage floor. For this reason, in order to avoid interference with the floor panel etc. in the breather pipe 4, the downward curved part 4a which curved the middle downward is formed.

≪Configuration of mis-lubrication prevention structure≫
As shown in FIG. 1, the vehicle fuel tank misfueling prevention structure includes a main tank T1 for storing main fuel and a subtank T2 for storing starting subfuel, and the starting subfuel refueling for the subtank T2. This is a structure for preventing the mistake of the port T2a and the main fuel supply port 3a of the main tank T1 and the liquid replenishment port 5a of the other tank 5 storing other liquids. In this erroneous fueling prevention structure, the main cap 1 that closes the main fuel filling port 3a of the main tank T1 and the subcap 2 that closes the starting sub fuel filling port T2a of the sub tank T2 are respectively located at different positions on the vehicle body B. Is arranged. The main fuel supply port 3a is installed on one side surface (left side surface) of the vehicle body B, and the starting sub fuel supply port T2a is installed on the other side surface (right side surface) of the vehicle body B. The fuel components of the main fuel and the starting sub fuel may be changed as appropriate and are not particularly limited.

≪Relationship of tanks etc. in vehicles≫
Furthermore, the arrangement relationship between tanks in the vehicle C and the supply ports of the tanks will be described with reference to FIG.
The main tank T1 is disposed, for example, below the front seat at the approximate center of the vehicle body B. The main fuel filling port 3a of the main tank T1 is disposed, for example, on the rear left side of the vehicle body B (rear side of the rear door).

  The subtank T2 and the starting subfuel supply port T2a of the subtank T2 are disposed, for example, at a point-symmetrical position with respect to the vehicle body B on the opposite side of the main fuel supply port 3a around the main tank T1. The sub-tank T2 is arranged at a corner on the right rear side of the engine room in a state surrounded by a protector 16 (see FIG. 7) that is a metal guard member. The sub fuel refueling port T2a for start-up is arranged at an outer portion of the vehicle body B to which the sub tank T2 is fixed, is closed by the sub cap 2, and is arranged on the outer surface of the vehicle body B so as to be rotatable. Covered with.

  The engine E is disposed in an engine room provided in the front part of the vehicle body B. In this engine room, various tanks 5 such as a washer tank T3 for storing a washer liquid for cleaning the windshield and an oil tank (not shown) for storing brake oil are arranged. Other tanks 5 other than the main tank T1 and the sub tank T2 are provided with other caps 51 formed in a shape different from the main cap 1 and the sub cap 2 as described later. The other cap 51 is formed in a shape having a female screw portion 51a (see FIG. 4C) and is formed so as not to be shared with the main cap 1 and the sub cap 2.

  Next, the piping connection relationship and each member will be described in more detail with reference to FIG. 2 mainly. FIG. 2 is a block diagram showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention.

≪Configuration of main fuel filler opening≫
As shown in FIG. 2, the main fuel filler port 3a is a filler port for supplying main fuel such as alcohol for driving the engine E, and the distal end of the filler pipe 3 whose base end is connected to the main tank T1. Is formed.
In the vicinity of the main fuel filler opening 3a of the filler pipe 3, the air in the upper space in the main tank T1 is exhausted to the vicinity of the main fuel filler opening 3a of the filler pipe 3 at the time of refueling so that the fuel can be smoothly supplied. A breather pipe 4 for refluxing the evaporated gas is connected.
One end of the breather pipe 4 is connected to the breather valve 8 installed in the upper space in the main tank T1, the other end is connected to the vicinity of the main fuel filler opening 3a of the filler pipe 3, and a downward curved portion formed in the middle. A three-way joint attached to the staying fuel suction pipe 4b is connected to 4a.

FIG. 3 is a diagram showing a misfueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is a perspective view of the vehicle showing an installed state of a main fuel lid and a main cap.
The main fuel filler opening 3a is closed by a main cap 1 shown in FIG. 3, and is further covered with a main fuel lid 6 that is rotatably disposed on the outer surface of the vehicle body B. On the inner surface of the main fuel lid 6, a label for preventing misfueling clearly stating that the main fuel filling port 3 a (see FIG. 2) in the main fuel lid 6 is a filling port for alcohol (main fuel). 61 is affixed.

  FIGS. 4A and 4B are diagrams showing a misfueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, wherein FIG. 4A is a perspective view of the main cap, FIG. 4B is an enlarged plan view of the main cap, and FIG. FIG. 4 is an enlarged perspective view of another cap.

≪Main cap configuration≫
The main cap 1 shown in FIG. 4A has a bottomed cylindrical male screw portion 1a that is screwed into a female screw portion (not shown) formed in the main fuel filler opening 3a (see FIG. 2) to close the screw. . For example, as shown in FIG. 4B, “SOMENTE PARA O TANQUE TRASEIRO (for alcohol)” is added to the surface of the main cap 1. In this way, the main cap 1 is displayed with a warning by characters and marks for preventing erroneous refueling.
The main cap 1 is formed in substantially the same shape as a starting auxiliary fuel filler port T2a (see FIG. 7), which will be described later, and is formed with different sizes such as the diameter of the male screw portion 1a (see FIG. 7). Not compatible with cap 2. That is, the outer peripheral edge 1b of the main cap 1 is formed with a diameter so as to abut on and interfere with the opening end T2b (see FIG. 7) of the starting auxiliary fuel supply port T2a.

≪Main tank configuration≫
The main tank T1 shown in FIG. 2 is, for example, a resin fuel tank. On the upper surface of the main tank T1, a main pump module P1 and a breather that incorporates a float valve that closes when the tank is full are installed. A valve 8 and a rollover valve 9 having a built-in float valve are also provided.

<Configuration of main pump module>
The main pump module P1 includes a main pump P1a for sending main fuel to the injector 11 via a strainer 10 installed outside the main tank T1 by a main feed line L1 connected to the main pump module P1. . In addition, the main pump module P1 includes a pressure regulator V1 installed in a return pipe L3 for returning main fuel that is excessive with respect to the consumption amount of the engine E to the main tank T1 when the main pump P1a is started. A foreign matter removal suction filter, a fuel level gauge for detecting the fuel level in the main tank T1, and the like are installed.

≪Engine configuration≫
The engine E shown in FIG. 2 is appropriately and efficiently driven by the main fuel and the starting sub fuel. An intake manifold Ea that is an intake passage of the engine E is configured such that the air purified by the air cleaner A is supplied to the engine E through the throttle valve S. A nozzle 12 for injecting the starting sub fuel is installed at the base end of the intake manifold Ea. The nozzle 12 is connected to the sub tank T2 by a sub feed line L2 for supplying a starting sub fuel.

≪Canister configuration≫
The canister 14 contains an adsorbent into which the fuel evaporative gas in the upper space in the main tank T1 and the sub tank T2 is sent and temporarily adsorbed, and the fuel evaporative gas is discharged into the atmosphere from the discharge pipe L6. This is intended to prevent this. The canister 14 is provided with a canister filter for removing dust.

  The canister 14 is connected to a purge pipe L4 connected to the intake manifold Ea via a purge adjusting electromagnetic valve V2, and to a rollover valve 9 of the main tank T1 via a joint J1 and a first two-way valve V3. The vent pipe L5 is connected to a discharge pipe L6 communicating with the atmosphere via a canister filter. A sub tank vent line L7 connected to the sub tank T2 is branched from the joint J1 via a second two-way valve V4 for pressure adjustment.

  When the purge adjustment electromagnetic valve V2 is opened by a command from an ECU (not shown) during the purge operation of the engine E, the fuel evaporative gas stored in the canister 14 is discharged from the atmosphere by the negative pressure of the intake manifold Ea. By being sucked into the canister 14 via the pipe L6, it is separated from the adsorbent and supplied to the intake manifold Ea via the canister 14, the purge pipe L4, and the purge adjustment electromagnetic valve V2 together with the atmosphere. . At this time, an ECU (not shown) connected to the purge adjustment electromagnetic valve V2 or the like controls the length of the open time of the purge adjustment electromagnetic valve V2 based on the signal of each sensor, and the intake amount of the fuel evaporative gas Is adjusted.

  FIG. 5 is a diagram showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is a sectional view of a sub tank. FIG. 6 is a view showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is a front view of a subcap.

≪Sub tank configuration≫
As shown in FIG. 5, the sub tank T2 is a container for storing the starting sub fuel. On the upper surface of the sub-tank T2, a sub-pump module P2 and a sub-cap 2 are attached to and detached from the upper surface toward the inside of the sub-tank T2. T2a (see FIG. 7) and a rollover valve V5 are provided. As shown in FIG. 5, the sub-tank T2 is formed of a substantially triangular container having a shallow front side and a deep rear side when viewed from the side, and a sub-cap 2 labeled with gasoline (SOMENTE GASOLINA) on the surface at the center. (See FIG. 6) is arranged, the rollover valve V5 is arranged on the front side, and the sub pump module P2 is installed on the rear side. The sub tank T2 is made of, for example, a resin tank having a capacity of 0.7 liter.

<Configuration of sub pump module>
The sub-pump module P2 is provided with a sub-feed line L2 shown in FIG. 2 for supplying start-up sub-fuel to the intake manifold Ea via the solenoid valve V6 and the nozzle 12 for supplying and stopping the start-up sub-fuel. A sub pump P2a is mainly provided. In addition, as shown in FIG. 5, the sub-pump module P2 has a sub-feed line L2 (FIG. 2) for sending sub-starting fuel for the sub-tank T to the engine E when the sub-pump P2a is started under the set conditions. The pressure regulator P2d, which is installed in the system) to adjust the pressure of the starting auxiliary fuel, the suction filter P2b for removing foreign matter, and the fuel level in the sub tank T2 is detected, and the amount of remaining starting auxiliary fuel is small. A remaining fuel warning sensor (not shown) for detecting this is installed.

  FIG. 7 is a diagram showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is a schematic cross-sectional view of a main part showing an installed state of a sub tank and a sub cap.

<Configuration of starting secondary fuel filler opening>
As shown in FIG. 7, the starting auxiliary fuel supply port T2a is formed by a neck pipe T2c installed obliquely upward in the upper part of the sub tank T2. The neck pipe T2c has a starting sub fuel supply port T2a to which the sub cap 2 is attached and detached at one end, and the sub tank T2 is welded to the other end. The starting sub fuel refueling port T2a of the neck pipe T2c is installed in a cylindrical case body 15 provided continuously in a vehicle body opening B3 provided on a side surface of the vehicle body B.
Inside the neck pipe T2c, an internal thread portion T2d into which the external thread portion 2a of the sub cap 2 is screwed is formed.

  The cylindrical case body 15 has a vehicle body opening B3 connected to one end and a neck pipe T2c connected to the other end, and a sub-cap for closing the starting sub fuel supply port T2a in the cylindrical case body 15 2 is arranged. A sub-fuel lid 7 for opening and closing the vehicle body opening B3 is pivotally supported on the inner wall of the cylindrical case body 15 by a hinge member (not shown).

  FIG. 8 is a view showing a misfueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is an enlarged view of a label attached to a sub fuel lid. FIG. 9 is a diagram showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and is an enlarged perspective view of a main part of the vehicle showing an installed state of a sub fuel lid and a sub cap.

<Configuration of sub fuel lid>
The sub fuel lid 7 shown in FIGS. 7 and 9 is made of, for example, a substantially circular metal plate made of metal, and has an outer surface coated with a paint having the same color as that of the vehicle body B. The sub fuel lid 7 is disposed so that the outer surface portion is flush with the outer surface of the outer panel of the vehicle body B when the vehicle body opening B3 is closed. In order to prevent the liquid other than the starting auxiliary fuel from being injected into the back surface of the sub fuel lid 7, a misfueling prevention label 71 with a precautionary statement about misfueling such as “only for gasoline” added ( 8 and 9) is attached. The label 71 is a so-called caution label, and is used for alerting and displaying visually with attached letters and marks to prevent erroneous assembly of the cap and erroneous lubrication. .
Instead of the label 71, a character or mark for displaying a warning for preventing misfueling may be directly attached to the back surface of the sub fuel lid 7.

<Sub cap configuration>
As shown in FIG. 9, the sub-cap 2 that opens and closes the starting auxiliary fuel supply port T <b> 2 a is a vehicle body opening B <b> 3 provided on the front side of the front door B <b> 1 of the driver's seat on the side surface of the vehicle body B and below the front pillar B <b> 2. It is the cap made from resin arrange | positioned by. The vehicle body B is provided with a sub fuel lid 7 that opens and closes the vehicle body opening B3 and covers the sub cap 2 so as to be freely opened and closed. The sub cap 2 is formed in a different shape or size from the other liquid replenishing port cap 51 (see FIG. 4C) mounted on the vehicle C so that it cannot be erroneously assembled. The sub cap 2 is formed in such a manner that the size of the aperture is different from that of the main cap 1 and there is no mounting compatibility. On the surface of the sub-cap 2, for example, warning indications such as “for gasoline”, “for gasoline only”, “for front tank”, or the like are displayed.

≪Configuration of other tanks and other caps≫
As shown in FIG. 1, the other tanks 5 are tanks other than the main tank T1 and the sub tank T2, and are tanks that store liquids such as a washer tank T3 disposed in the engine room, for example. The other tank 5 is screwed with another cap 51 having a female screw portion 51a as shown in FIG. The other caps 51 may be caps other than the main cap 1 and the sub cap 2.

≪Action≫
Next, with reference to each figure, the effect | action of the erroneous fueling prevention structure of the vehicle fuel tank which concerns on embodiment of this invention is demonstrated.

<When refueling main fuel>
First, the case where the main fuel is supplied will be described with reference to the drawings.
When an ignition switch (not shown) is turned on, the fuel tank system is started. The driver can know the remaining amount of main fuel in the main tank T1 shown in FIGS. 1 and 2 by a fuel gauge (not shown) of an instrument panel (not shown). When the remaining amount of the starting sub fuel in the sub tank T2 decreases due to the warm-up operation, the warning light is turned on. What is necessary is just to supply oil suitably according to it.

  When refueling the main fuel, as shown in FIGS. 1 and 3, the main fuel lid 6 disposed at the rear left side of the vehicle body B is opened, the main cap 1 is rotated, and the main fuel refueling port 3a is opened. Open and supply main fuel from the main fuel supply port 3a. At this time, as shown in FIG. 3, a label 61 is attached to the back surface of the main fuel lid 6, which indicates that the main fuel lid 6 is mainly alcohol or gasoline. Further, the main cap 1 is additionally described as being for the rear tank as shown in FIGS. 4 (a) and 4 (b). As shown in FIG. 1, the main cap 1 that closes the main fuel filler opening 3 a is located at a symmetrical position of the vehicle body B with respect to the subcap 2 for the starting auxiliary fuel filler opening T <b> 2 a (see FIG. 7). So they are separated from each other. Further, the main cap 1 is separated from the position where the cap 51 of the other tank 5 such as the washer tank T3 in the engine room is located.

  As a result, the warning display between the main fuel lid 6 and the main cap 1 can prevent the auxiliary fuel other than the main fuel and other liquids from being replenished to the main fuel filler opening 3a. Furthermore, since the main cap 1 is different from the sub cap 2 and the other cap 51 in the installation position and the shape and size of each, the cap can be prevented from being assembled incorrectly.

When the main fuel filler port 3a is plugged with the main cap 1, the diameter of the main fuel filler port 3a is different even if an attempt is made to plug the main fuel filler port 3a with the sub cap 2. Therefore, the main fuel filler port 3a is plugged with the sub cap 2. You can't do that.
Further, when the main fuel filler port 3a is to be plugged with another cap 51, the other cap 51 is composed of the female screw portion 51a as shown in FIG. It is impossible to screw into the female screw portion T2d.

  As a result, it is possible to prevent the caps other than the main cap 1 from being attached to the main fuel supply port 3a, and it is possible to prevent fuel and liquid other than the main fuel from being supplied from the main fuel supply port 3a.

  When the main fuel is supplied from the main fuel supply port 3a, the main fuel is injected into the main tank T1 through the filler pipe 3 from the main fuel supply port 3a as shown in FIG. At this time, the fuel that has been liquefied and retained in the downward curved portion 4a of the breather pipe 4 is collected from the retained fuel suction pipe 4b, so that the fuel evaporative gas in the upper space in the main tank T1 is discharged from the vent pipe L5. By flowing into the canister 14 and the breather pipe 4, lubrication can be performed smoothly.

  The main fuel is sent from the main pump P1a in the main tank T1 to the injector 11 through the main feed line L1 for use when the engine E is started at normal temperature or when the normal engine E is driven.

<When supplying auxiliary fuel for starting>
When refueling the starting sub fuel, as shown in FIG. 9, the sub fuel lid 7 disposed on the right front side of the vehicle body B is opened, and the sub cap 2 is rotated to start the sub fuel refueling port for starting. T2a (see FIG. 7) is opened, and starting auxiliary fuel is supplied from the starting auxiliary fuel supply port T2a. At this time, as shown in FIG. 9 and FIG. 8, a label 71 is attached to the back surface of the sub fuel lid 7, which indicates that the sub fuel lid 7 is a starting secondary fuel such as gasoline.

  Further, as shown in FIGS. 6 and 8, the subcap 2 is additionally described as dedicated to gasoline, which is a starting auxiliary fuel. The sub cap 2 that closes the starting sub fuel refueling port T2a is located away from the main cap 1 at the symmetrical position of the vehicle body B as shown in FIG. Further, the sub cap 2 is covered with the sub fuel lid 7, while the cap 51 of the other tank 5 in the engine room is covered with a bonnet (not shown).

  As a result, the warning display of the sub fuel lid 7 and the sub cap 2 can prevent the starting sub fuel supply port T2a from being supplemented with main fuel other than the starting sub fuel or other liquid. Furthermore, since the sub cap 2 is different from the main cap 1 and the other cap 51 in the installation position and the shape and size of each, it is possible to prevent erroneous assembly.

  FIG. 10 is a diagram showing a structure for preventing erroneous fueling of a vehicle fuel tank according to an embodiment of the present invention, in which an attempt is made to accidentally close the sub-tank starting sub-fuel filler port with a main cap for the main fuel filler port. It is principal part sectional drawing which shows the state of time.

  When the main cap 1 is mistakenly assembled to the starting sub fuel refueling port T2a as shown in FIG. 10, the sub cap 2 should close the starting sub fuel refueling port T2a. Even if the main cap 1 attempts to plug the starting auxiliary fuel refueling port T2a, the outer diameter 1b on the assembly side of the main cap 1 becomes the opening end T2b of the starting subfuel refueling port T2a. Contact and interfere. In this way, it is impossible to close the starting auxiliary fuel supply port T2a by the main cap 1.

  In addition, when trying to plug the starting auxiliary fuel supply port T2a with the other cap 51, the other cap 51 includes the female screw portion 51a as shown in FIG. It cannot be screwed into the female thread T2d of T2a.

  As a result, it is possible to prevent caps other than the sub cap 2 from being attached to the starting sub fuel refueling port T2a, and to inject fuel or liquid other than the starting sub fuel from the starting sub fuel refueling port T2a. Can be prevented.

When the starting sub fuel is supplied from the starting auxiliary fuel supply port T2a, it is stored in the sub tank T2 shown in FIG. At this time, the fuel evaporative gas in the upper space of the sub-tank T2 flows into the canister 14 from the sub-tank vent line L7, so that fuel can be smoothly supplied.
The starting auxiliary fuel is sent from the sub tank T2 to the nozzle 12 through the sub feed line L2 and used during the low temperature or warm-up of the engine E.

≪Modification≫
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea. The present invention extends to these modifications and changes. Of course.

  In the above embodiment, as shown in FIG. 1, the main fuel filler opening 3 a is disposed on the left side rear side portion of the vehicle body B, and the starting auxiliary fuel filler port T <b> 2 a is disposed on the right front side portion of the vehicle body B. However, the present invention is not limited to this. For example, the main cap 1 that closes the main fuel filler opening 3a, the subcap 2 that closes the starting auxiliary fuel filler opening T2a, the main fuel lid 6 and the sub fuel lid 7 are arranged on the left and right side surfaces of the vehicle body B. As long as they are arranged at different positions in the part and are arranged at positions separated from each other, the vehicle body B may be installed by changing to another appropriate position.

  For example, in the case of a vehicle in which the engine E, the main tank T1, the sub tank T2, etc. are arranged on the rear side of the vehicle body B, the main cap 1 and the sub cap 2 are separately provided on the left and right side surfaces of the rear portion of the vehicle body. Similarly, the main fuel lid 6 and the sub fuel lid 7 may be separately arranged on the left and right side surfaces.

  Further, the sub cap 2, the main cap 1, and the other cap 51 are different from each other in the male screw portions 1a, 2a and the female screw portion 51a, or the sizes of the caps, the main fuel filler opening 3a, and the starting sub cap. Although the case where it formed by making the diameter of fuel refueling port T2a different was mentioned as an example, it demonstrated, it is not limited to this. For example, the sub cap 2, the main cap 1, and the other cap 51 are formed in a circular shape, a polygonal shape, etc. in plan view, and the shapes of the caps are different from each other. The colors may be different.

  The characters added to the sub cap 2 and the main cap 1 and the labels 61 and 71 attached to the main fuel lid 6 and the sub fuel lid 7 are not limited to those described in the above embodiment. Anything that urges the attention of misfueling. For example, the characters, labels 61 and 71 may change the shape, color, size, and display itself of the displayed characters in a timely manner. The character may be in Japanese or a foreign language, or may be a combination of both.

  The main fuel stored in the main tank T1 may be main fuel for driving the engine E, and may be gasoline other than alcohols. On the other hand, the starting sub fuel stored in the sub tank T2 may be any fuel that is used when starting the engine E, and may be appropriately changed to a fuel other than gasoline.

It is a figure which shows the erroneous fueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention, and is the schematic which shows the installation position of the main tank in a vehicle, a subtank, a main cap, and a subcap. It is a block diagram which shows the erroneous fueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention. It is a figure which shows the erroneous fueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention, and is a perspective view of the vehicle which shows the installation state of a main fuel lid and a main cap. It is a figure which shows the erroneous fueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention, (a) is a perspective view of a main cap, (b) is an enlarged plan view of a main cap, (c) is another cap FIG. It is a figure which shows the misfueling prevention structure of the vehicle fuel tank which concerns on embodiment of this invention, and is sectional drawing of a sub tank. It is a figure which shows the misfueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention, and is a front view of a subcap. It is a figure which shows the erroneous fueling prevention structure of the vehicle fuel tank which concerns on embodiment of this invention, and is a principal part schematic sectional drawing which shows the installation state of a subtank and a subcap. It is a figure which shows the misfueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention, and is an enlarged view of the label affixed on a sub fuel lid. It is a figure which shows the erroneous fueling prevention structure of the fuel tank for vehicles which concerns on embodiment of this invention, and is a principal part expansion perspective view of the vehicle which shows the installation state of a sub fuel lid and a sub cap. FIG. 5 is a diagram showing an erroneous fueling prevention structure for a vehicle fuel tank according to an embodiment of the present invention, and shows a state when the sub-tank starting sub-fuel filler port is accidentally closed with a main cap for the main fuel filler port. It is a principal part sectional view shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main cap 1a, 2a Male thread part 1b Outer periphery 2 Subcap 3a Main fuel filling port 5 Other tank 5a Liquid replenishment port 6 Main fuel lid 7 Sub fuel lid 51 Other cap 51a Female thread part B Car body C Vehicle T1 Main tank T2 Sub-tank T2a Sub-fuel filler for starting T2b Open end

Claims (1)

A main tank for storing main fuel;
A sub-tank having a smaller volume than the main tank and storing a starting sub fuel;
Other tanks other than the main tank and the sub tank mounted on the vehicle,
A main cap for closing the main fuel filler of the main tank;
A sub-cap that is directly attached to a starting sub-fuel filler port formed at an end of a sub-tank body of the sub-tank and closes the starting sub-fuel filler port;
Other caps that block the liquid replenishment ports of the other tanks;
A fuel oil prevention structure for a vehicle fuel tank equipped with
The main fuel filler port is installed on one side of the vehicle body,
The starting auxiliary fuel filler port is installed on the other side of the vehicle body,
The vehicle body is provided with a main fuel lid that covers the main cap on one side surface, and a sub fuel lid that covers the sub cap on the other side surface ,
At least one of the main cap and the sub-cap has a warning display for preventing misfueling,
The main cap and the sub cap each have a male screw portion and an outer peripheral edge,
The other cap has an internal thread portion,
At the opening end of the main fuel filling port and the opening end of the starting auxiliary fuel filling port, the diameter of the opening end of the starting auxiliary fuel filling port is larger,
An erroneous fueling prevention structure for a fuel tank for a vehicle, wherein an outer peripheral edge of the main cap interferes with the opening end when the main cap is assembled to the sub tank fueling port .

Images