JP2691446B2 - Fuel inlet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an improvement in a fuel inlet for a vehicle.

<Prior Art> Conventionally, the structure of the fuel inlet 1 is as shown in FIG. The fuel inlet 1 is a tubular member provided obliquely upward to the right from the right side wall of the fuel tank 3. In addition,
In the figure, reference numeral 5 is a blister hose, reference numeral 6 is a rollover valve, and reference numeral 7 is a canister. The rollover valve 6 and the canister 7 are connected by a first ventilation passage 8. A pressure adjusting valve (not shown) is provided in the first ventilation passage 8 to keep the internal pressure of the tank 3 constant. Then, by inserting the fuel injection nozzle 9 into the fuel injection port 1,
Feed 11 into tank 3.

At this time, in the fuel injection port 1 having the above-described structure, a clearance fits with the nozzle 9, so that the fuel vapor vaporized in the tank 3 leaked to the outside from the clearance.

Therefore, as shown in FIG. 9, a fuel inlet 10 having a seal member 14 on the inner surface has been proposed (see SAE Technical Paper 851204). Reference numeral 15 in the drawing is a retainer, reference numeral 17
Is a trapdoor. In this fuel injection port 10, when the nozzle 9 is inserted, the trap door 17 opens to the back side, and the seal member 14 continuously and closely contacts the outer surface of the nozzle 9 in the circumferential direction (see FIG. 10). As a result, the fuel vapor in the tank 3 does not leak outside.

If the fuel inlet 10 is configured as shown in FIG. 9, the tank 3
Since the fuel cell is sealed, the air having the same volume as the injected fuel must be discharged from the first ventilation passage 8 at the time of fuel injection. However, the diameter of the conventional first ventilation passage 8 is small, and the air cannot be efficiently discharged.

Therefore, it is conceivable to increase the diameter of the first ventilation passage 8, but then it becomes difficult to prevent the fuel from flowing from the ventilation passage 8 into the canister 7 when the vehicle falls. Further, when the fuel becomes mist-like at the time of fuel injection or the like, a large amount of the fuel mist is generated by the canister 7.
There is a risk that it will flow into and exceed its capacity.

Therefore, it was considered to provide the second ventilation passage 12 as shown in FIG. 11 in addition to the first ventilation passage 8.

In normal use, the second ventilation passage 12 must be closed (the first ventilation passage 8 is open). This is to keep the internal pressure of the tank 3 constant.

Then, at the time of fuel injection, the second ventilation passage 12 is opened. At this time, the first ventilation passage 8 is closed. This is because in addition to the large amount of air containing fuel vapor being sent to the canister 7 from the newly provided second ventilation passage 12,
This is because when the air containing the fuel mist is sent from the ventilation path 8, the capacity of the canister 7 may be exceeded.

Such opening and closing of the first ventilation passage 8 is performed by a solenoid valve, and the solenoid valve is controlled by the nozzle 9 inserted into the fuel inlet 1.
Is carried out by a detection means (see Japanese Utility Model Laid-Open No. 64-8425, etc.).

<Problems to be Solved by the Invention> As described above, it is necessary to open and close the second ventilation passage newly provided this time and the use condition. Therefore, it is conceivable to provide a solenoid valve and a means for controlling the solenoid valve as in the first ventilation passage.

However, doing so is not preferable because the number of parts increases.

<Means for Solving the Problems> The present invention is a fuel injection port made in view of the above problems, and has a configuration including a cylindrical main body portion that is connected to a fuel tank and opens to the outside of the vehicle, and the main body. An annular seal member that is disposed on the inner surface of the portion and that is in close contact with the outer surface of the fuel injection nozzle in the circumferential direction, and that the nozzle is inserted into the main body portion to detect the fuel tank and the canister. And a detection means for controlling a solenoid valve that opens and closes a first ventilation path that connects the fuel cell and a second ventilation path that communicates with the canister. The second ventilation path is located deeper than the annular seal member. An opening / closing valve is provided which is opened to the peripheral wall of the main body and is moved in the second ventilation passage by being pressed by the nozzle inserted in the main body and opening the opening of the second ventilation passage when being pressed. Is installed, the detection means The opening / closing valve, a permanent magnet arranged in the opening / closing valve, and a peripheral magnet arranged around the opening / closing valve, and is turned on when the opening of the second ventilation passage is opened by the opening / closing valve by the permanent magnet, and (2) A reed switch that is turned off when the opening of the ventilation path is closed and is connected to an electric circuit for the electromagnetic coil of the solenoid valve, and the solenoid valve is closed when the reed switch is turned on. The solenoid valve is controlled to open when the reed switch is turned off.

<Examples> Hereinafter, the present invention will be described in more detail with reference to Examples.

The fuel injection port 20 of the embodiment includes a main body portion 21, a seal member 25,
The detection mechanism 40 and the float valve 71 are provided.

The main body 21 has a tubular shape, and a cap 23 for receiving a fuel cap (not shown) is inserted inside the inlet 22. The mouthpiece 23 is reduced in diameter on the inner side (reduced diameter portion 24) and guides the nozzle 9 to the seal member 25. The seal member 25 is an annular member formed of nitrile rubber, and is composed of a seal main body portion 25a whose diameter decreases toward the back and a cylindrical base portion 25b continuous to the large diameter portion of the seal main body portion 25a. . The base portion 25b is fitted to the retainer 27. The retainer 27 is fixed to the inner circumference of the main body 21.

The molding material of the sealing member 25 is such that the inner peripheral surface of the sealing member 25 is brought into close contact with the outer surface of the nozzle 9 continuously in the circumferential direction.
A suitable sealing property is obtained between the 25 and the nozzle 9, and
If it has oil resistance, heat resistance, cold resistance, weather resistance, etc., it is not particularly exhibited. In addition to the nitrile rubbers, synthetic rubbers such as fluorine rubber and fluorosilicone rubber, and elastic polymer materials such as polyester-based, polyvinyl chloride-based and polyurethane-based thermoplastic elastomers can be used. At least the seal body 25a may be made of such a material.

A cylindrical base 31 of a nozzle guide 29 is sandwiched between the main body 21 and the retainer 27. The reduced diameter portion 33 of the nozzle guide 29, the seal member 25, and the reduced diameter portion 24 of the mouthpiece 23 have their axes aligned with each other.

When the nozzle 9 is not inserted, the nozzle guide 29 is closed by the trap door 35. This trapdoor 35
Swings around a shaft 34 fixed to the main body 21.

The main body 21 is divided into two pieces on the inner side thereof, and an opening 38 is provided in the side wall. The large diameter branch pipe 36 is
As shown, it is connected to the tank 3. The small-diameter branch pipe 37 is connected to the blister hose 5. At the upper edge of the opening of the small diameter branch pipe 37, it is preferable to provide a ridge orthogonal to the air flow from the blizzer hose 5. As a result, even if the fuel mist flows to the blizzer hose 5, the fuel mist collides with the ridges and drops.

At the end edge of the opening 38, a detection mechanism 40 and a case 39 of the float valve 71 are provided upright.

The detection mechanism 40 as a detection means for detecting the nozzle 9 inserted into the main body portion 21 includes a trap door 35 and a valve body 41 that move in contact with the nozzle 9 inserted into the main body portion 21, and a valve body 41.
And a reed switch 57.

A valve body 41 corresponding to the on-off valve according to the claims can contact the trap door 35 by extending from a top in FIG. 1 to a spring seat 43 having a bottomed cylindrical shape, a conical seal surface 53 provided with an O-ring, and a downward direction. It is provided with a different portion (contact portion 55). The valve element 41 is inserted into the inner case 60 and can move vertically in FIG. At the center of the spring seat 43, a pillar 47 supporting the permanent magnet 45 is proved. A compression coil spring 51 is interposed between the spring seat 43 and the inner wall 49 of the case 39 to urge the valve body 41 downward (in the direction of the center of the main body portion 21) in FIG. As a result, the permanent magnet 45 is separated from the lead switch 47 and the lead switch 47 is turned off in a state where the nozzle 9 is not inserted into the main body portion 21. At the same time, the conical sealing surface 53 is pressed against the sealed surface 65 of the inner case 60, and the main body portion 21 and the second ventilation passage 70 described later are closed.

The inner case 60, as shown in detail in FIG.
Bottom plate 61 fixed to and the conical sealed surface (valve seat)
65 and a guide 67 having a frame structure occupying each side of a virtual cube surrounding the spring seat 43 of the valve body 41. Through holes 63 are formed in the bottom plate 61. The abutting portion 55 of the valve element 41 is in a clearance fit with one of the through holes 63.

The reed switch 57 is arranged in a space formed by the peripheral wall of the case 39 and the inner wall 49. The reed switch 57 is turned off when the permanent magnet 45 is separated, and in the circuit shown in FIG. 6, the check valve 58 is opened by the electromagnetic coil.
59 works. The check valve 58 is provided in the first ventilation passage 8 to open and close the ventilation. On the other hand, when the permanent magnet 45 approaches, the reed switch 57 is turned on, and the electromagnetic coil 59 operates so as to "close" the check valve 58 in the circuit.

As shown in FIGS. 4 and 5, a second ventilation passage 70 is provided vertically from the case 39. The second ventilation passage 70 is connected to the canister 7 as shown in FIG. This second air passage 70 efficiently discards the air in the tank when fuel is injected.
It has a larger diameter than the first ventilation passage 8 directly connected to the tank 3. A portion of the second ventilation passage 70 which is continuous with the case 39 is expanded in diameter together with the case. A float 71 valve is installed in this enlarged portion. Due to the compression coil spring 73, the float valve 71 has an apparent specific gravity lighter than that of the fuel. Reference numeral 75 in the drawing is a retainer for the spring 73. A hemispherical valve portion 76 is formed on the upper surface of the float valve 71, and the peripheral edge of the inlet 77 of the second ventilation passage 70 serves as a corresponding valve seat.

Inserting the nozzle 9 into the main body 21 and conical sealing surface of the valve body 41
When the fuel flows into the second ventilation passage 70, such as when the auto stop mechanism of the nozzle 9 fails in a state where the 53 is separated from the sealed surface 65 of the inner case 60, the float valve 71 floats and the inlet 77 To block.

Next, the operation of the fuel injection port 20 of the embodiment will be described.

(1) Normal Use State In FIG. 1, the state where the fuel cap is attached to the inlet 22 of the main body 21 is the normal use state. At this time, the valve body 41 is biased toward the center of the main body 21 by the spring 51, so that the conical seal surface 53 of the valve body 41 is the sealed surface of the inner case 60.
It is pressed against 65. Therefore, the second ventilation passage 70 is closed in the main body 21 and immediately in the tank 3. Of course, the inside of the main body 21 and the outside air are isolated from each other by a fuel cap (not shown).

Further, since the valve body 41 is biased toward the center of the main body 21, the permanent magnet 45 is separated from the reed switch 57. Therefore, the reed switch 57 is turned off and the check valve 58 of the first air passage 8 is opened.

After that, when the fuel cap for injecting fuel is removed, the state shown in FIG. 1 is obtained.

(2) Fuel injection state When the nozzle 9 is inserted into the main body portion 21, as shown in FIG.
The trap door 35 is pushed open. Then, the trap door 35 contacts the contact portion 55 and pushes the valve element 41 outward (upward in FIG. 2). Then, the conical seal surface 53 is separated from the sealed surface 65, and the main body 21, that is, the tank 3 and the second ventilation passage 70 are ventilated. The air flow is indicated by arrows in FIG. Further, the valve body 41 pushed by the trap door 35 causes the magnet 45 thereof to approach the reed switch 57. Therefore, the reed switch 57 is turned on, and the check valve 58 of the first ventilation passage 8 is closed.

That is, the position of the nozzle 9 is brought out by the detection mechanism 40, and the check valve 58 is automatically closed.

As a result, the air in the tank is efficiently discharged from the large-diameter second ventilation passage 70 during fuel injection. Since the first ventilation passage 8 is closed, the fuel mist in the tank 3 is not sent to the canister 7 and its capacity is not exceeded.

(3) When the injection of the fuel is completed and the nozzle 9 is pulled out from the main body portion 21, the trap door 35 rotates counterclockwise. As a result, the trap door 35 does not interfere with the portion 55, and the valve body 41 is urged by the spring 51 toward the center of the body portion 21 to return to the state of FIG. Therefore, the second ventilation passage 70 is closed, the reed switch 57 is turned off, and the check valve of the first ventilation passage 8 is opened.

<Operation and Effect of the Invention> As described above, the fuel injection port of the present invention is the first
The component itself of the means (detection means) for controlling the solenoid valve of the ventilation passage has an opening / closing valve for the opening of the second ventilation passage, a permanent magnet arranged in the opening / closing valve, and a periphery of the opening / closing valve, And a reed switch that is turned on and off by a permanent magnet and is electrically connected to an electric circuit for the electromagnetic coil of the electromagnetic valve.

Therefore, it is not necessary to provide an opening / closing dedicated to the second ventilation passage and a means for controlling the opening / closing. Therefore, even if the second ventilation passage is newly provided, it is necessary to simply control the solenoid valve of the first ventilation passage.
Only the on-off valve, the permanent magnet, and the reed switch that conducts to the electric circuit for the electromagnetic coil of the electromagnetic valve are provided, and other components are not increased at all.

That is, according to the present invention, an inexpensive fuel injection port can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view (cross-sectional view taken along the line I--I of FIG. 4) of a fuel injection port 20 of an embodiment of the present invention, FIG. 2 is a cross-sectional view with the nozzle 9 inserted, and FIG. Is a front view of the fuel injection port 20 (which is attached to the vehicle in this state), FIG. 4 is a sectional view taken along line IV in FIG. 3, and FIG. 5 is a partial sectional view taken along line VV in FIG. 6 is a wiring diagram of the reed switch 57 and the electromagnetic coil 59, FIG. 7 is a diagram showing the connection between the fuel inlet 20 and the tank 3, and FIG. 8 is a sectional view showing the fuel inlet 1 of the conventional example. FIG. 9 is a cross-sectional view showing another conventional fuel injection port 10, FIG. 10 is a cross-sectional view showing a state in which the nozzle 9 is inserted into the fuel injection port 10, and FIG. 11 is a new second ventilation passage 12 FIG. 4 is a cross-sectional view showing a fuel injection port of a study plan provided with. 1,10,18,20 …… Fuel inlet, 3 …… Tank, 8 …… First ventilation passage, 9 …… Nozzle, 12,70 …… Second ventilation passage, 14,25 …… Seal member, 21 ...... Main body, 40 …… Detection mechanism (detection means), 41 …… Valve element (opening / closing valve body of the second ventilation passage), 58 …… Check valve (opening / closing valve body of the first ventilation passage).

Front page continued (72) Inventor Mitsuhiro Kikuta Kasugamura, Aichi Prefecture Kasugamura Ochiai character Nagahata No. 1 in Toyoda Gosei Co., Ltd. Within

Claims (1)

(57) [Claims] 1. A tubular main body which is connected to a fuel tank and which is open to the outside of the vehicle, and an annular ring which is disposed on the inner surface of the main body and which is in continuous circumferential contact with the outer surface of the fuel injection nozzle. A seal member, detecting that the nozzle is inserted into the main body,
A fuel injection port comprising: a detection unit that controls a solenoid valve that opens and closes a first ventilation path that connects the fuel tank and the canister, wherein a second ventilation path that communicates with the canister is the annular seal member. It is opened to the peripheral wall of the main body located on the further back side, and is moved by being pushed by the nozzle inserted into the main body into the second ventilation passage, and the opening of the second ventilation passage is opened at the time of the pressing. An opening / closing valve for opening is arranged, the detecting means is arranged around the opening / closing valve, a permanent magnet arranged in the opening / closing valve, and the opening / closing valve, and by the permanent magnet, 2 A reed switch that is turned on when the opening of the air passage is opened and turned off when the opening of the second air passage is closed, and is connected to an electric circuit for the electromagnetic coil of the solenoid valve. The reed switch The fuel injection port is characterized in that the solenoid valve is closed when the switch is turned on, and the solenoid valve is opened when the reed switch is turned off.