JP2808403B2 - Evaporative fuel processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank having an oil supply pipe extending upward, a canister for adsorbing fuel vapor from the fuel tank, and a lower part of a nozzle inserted into the oil supply pipe. An evaporative fuel processing apparatus comprising: an on-off valve that opens when refueling by a refueling gun and that communicates between the fuel tank and the canister when the refueling gun automatically stops fuel supply when the fuel level reaches the negative pressure introduction hole. About.

[0002]

2. Description of the Related Art Conventionally, such an apparatus is disclosed in, for example,
It is already known from 1-53451.

[0003]

SUMMARY OF THE INVENTION In the above prior art,
The canister adsorbs the evaporative fuel generated from the fuel tank at the time of refueling by the fuel gun, and discharges the evaporative fuel from the refueling pipe to the outside by making a seal provided in the refueling pipe close to the outer periphery of the nozzle of the refueling gun. To prevent it. However, the durability of the seal is a problem, and if the seal deteriorates or breaks due to repeated refueling, it is inevitable that the fuel vapor is discharged to the outside from the fuel supply pipe.

[0004] The present invention has been made in view of the above circumstances, and without using a seal that has a problem in durability, or even if the seal used is incomplete, the fuel evaporated from the oil supply pipe at the time of refueling. It is an object of the present invention to provide an evaporative fuel treatment device capable of minimizing the emission of fuel.

[0005]

In order to achieve the above object, the invention according to claim 1 comprises a fuel tank having an oil supply pipe extending upward, a canister for adsorbing fuel vapor from the fuel tank, The fuel tank and the fuel tank are opened when refueling by a refueling gun that automatically stops fuel supply in response to a fuel level reaching a negative pressure introduction hole provided at a lower end of a nozzle inserted into the refueling pipe. An on-off valve communicating between the canisters and one end communicating with the upper space in the fuel tank
Evaporative fuel passage with the other end opened into the oil supply pipe
In the evaporative fuel processing device comprising:
The opening into the oil supply pipe of the road is
Arranged so as to face and communicate with the negative pressure introduction hole of the
During refueling before the fuel level reaches the negative pressure introduction hole,
From the fuel passage through the opening and the negative pressure introduction hole
Vapor fuel into the refueling gun, and the fuel
The fuel cell is characterized by being merged with the supply fuel flowing toward the refueling gun in the road .

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the evaporative fuel passage itself has a cross-sectional area for restricting the flow of the evaporative fuel, or There is provided a restricting means for restricting the flow of the fuel vapor.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a guide member for mounting the tip of the nozzle at the time of refueling is provided in the oil supply pipe, and the guide member is provided on the upper surface of the guide member. In the front , a plurality of connection holes commonly communicating with the fuel vapor passage are opened at intervals in the axial direction of
You configure the serial opening.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of the present invention. FIG. 1 is a cutaway sectional view showing the structure of an evaporative fuel treatment apparatus, and FIG. 2 is a sectional view of a refueling gun.

Referring to FIG. 1, a fuel tank T includes a tank main body 21 and a fuel supply pipe 22 extending obliquely upward from the tank main body 21. Is provided. One end of a first evaporated fuel passage 23 is connected to an upper portion of the tank main body 21, and a canister C for adsorbing the evaporated fuel from the fuel tank T is connected to the other end of the first evaporated fuel passage 23. . In addition, a float valve 26 including a float chamber 24 and a float 25 is provided at a connection portion of the first evaporative fuel passage 23 into the tank main body 21. The float valve 26 is closed when the fuel level in the fuel tank T reaches the level indicated by the dashed line, and is open when fuel is supplied to the fuel tank T.

An opening / closing valve V that opens during refueling is provided in the middle of the first evaporated fuel passage 23. A peripheral portion of a diaphragm 49 is sandwiched by the housing 48 of the on-off valve V, and the inside of the housing 48 is separated by the diaphragm 49 into a portion 23 of the first evaporated fuel passage 23 on the fuel tank T side.
The valve chamber 50 is divided into a valve chamber 50 communicating with a and a spring chamber 51. A spring 52 for urging the diaphragm 49 toward the valve chamber 50 is housed in the spring chamber 51. In the valve chamber 50, a valve body 54 that can open and close a valve hole 53 communicating with a portion 23b of the first evaporative fuel passage 23 on the canister C side and is connected to a diaphragm 49 is housed. Moreover, the spring chamber 51 is communicated with the oil supply port 22 a of the oil supply pipe 22 via the communication passage 55.

In such an on-off valve V, when the oil supply port 22a is closed, the differential pressure for displacing the diaphragm 49 to the side where the valve element 54 opens the valve hole 53 is applied to the valve chamber 50 and the spring chamber 51.
However, when the fuel supply port G is opened and the fuel is supplied into the fuel tank T by the fueling gun G, the pressure in the fuel tank T, that is, the valve chamber 50 is closed. In response to the increase in the pressure, the diaphragm 49 moves the spring chamber 5
1 is displaced to the side of reducing the volume, and the valve
Opens the valve hole 53, so that the valve is opened at the time of refueling.

At the time of refueling the fuel tank T, the nozzle 3 of the refueling gun G is inserted into the refueling port 22a of the refueling pipe 22.
The refueling gun G has a fuel level of the refueling port 22 of the refueling pipe 22.
This is a conventionally well-known type having a negative pressure-operated auto-stop mechanism for automatically stopping refueling when the fuel tank rises to the vicinity of a. Next, a schematic configuration of the refueling gun G will be described.

In FIG. 2, the refueling gun G includes a gun body 1 held by a refueling operator and a nozzle 3 inserted into a refueling port 22 a of a refueling pipe 22. A fuel passage 5 is provided in the gun body 1 so as to connect between the fuel supply pipe 4 and the nozzle 3, and a valve seat 5 a having a narrow flow passage cross section is formed in the middle of the fuel passage 5. Is done. An L-shaped link 8 which is rotatable around a pin 7 and supported by the gun body 1 is connected to the valve body 6 which can be seated on the valve seat 5a. A lock member 11 is provided between the lever 8 pivotally supported by the pin 9 on the gun body 1 and the link 8 so as to be vertically slidable and swingable, and formed inside the gun body 1. A rod 14 extending from a diaphragm 13 housed in the negative pressure chamber 12 is connected to an elongated hole 11 a provided in the lock member 11. At the lower end of the nozzle 3, a negative pressure introducing hole 3a is provided.
a is communicated with the negative pressure chamber 12 via the air passage 15, and the other end of the negative pressure passage 16 having one end communicating with the negative pressure chamber 12 is opened to the fuel passage 5 near the valve seat 5 a.

When the nozzle 3 of the refueling gun G is inserted into the refueling port 22a and the lever 10 is pulled upward, the lock member 11 moves upward, the link 8 is rotated clockwise, and the valve body 6 is rotated. Is separated from the valve seat 5a. Thereby, the fuel from the fuel supply pipe 4 is supplied into the fuel tank T through the fuel passage 5 and the nozzle 3. At this time, a negative pressure is generated in the vicinity of the valve seat 5a whose flow path cross-sectional area is narrowed. However, unless the negative pressure introduction hole 3a opened at the lower end of the nozzle 3 is closed, the negative pressure chamber 12 is kept at atmospheric pressure. And the diaphragm 13 does not operate, and the refueling state is maintained.

When the fuel tank T becomes full and the fuel level rises in the fuel supply pipe 22 and the negative pressure introduction hole 3a at the lower end of the nozzle 3 is closed with fuel, the valve seat is closed. The negative pressure near 5a acts on the negative pressure chamber 12 as it is, and the diaphragm 13 is displaced to the left in FIG. Thereby, the lever 10
Is not transmitted to the link 8, the valve body 6 is seated on the valve seat 5a by the pressure of the fuel flowing through the fuel passage 5, and the fuel supply is stopped.

A second evaporative fuel passage having one end communicating with the upper space in the fuel tank T in order to prevent the evaporative fuel from being discharged to the outside from the fuel supply pipe 22 during refueling by the refueling gun G as much as possible. The other end of 27 ₁ is inserted in the negative pressure introducing hole 3 a of the nozzle 3 at the time of refueling in the circumferential direction of the refueling pipe 22.
Also connection opening into the fuel supply pipe 22 at the portion corresponding to the direction, according
Opening 2 into the fuel supply pipe 22 of the evaporative fuel passage 27 ₁
7a ₁ faces the negative pressure introducing hole 3a of the nozzle 3 at the time of refueling.
It is arranged at the position where it communicates with The second evaporative fuel passage 2
Cross-sectional area of ₇₁ is set smaller than the cross-sectional area of the first evaporative fuel path 23 to restrict the flow of fuel vapor.

Next, the operation of the first embodiment will be described. When refueling the fuel tank T with the refueling gun G,
The float valve 26 and the opening / closing valve V are open, and the fuel vapor generated in the fuel tank T is supplied to the first fuel vapor passage 23.
Together guided to the canister C through, it is guided to the vicinity of the fuel supply port 22a of the oil supply pipe 22 through the second evaporative fuel path 27 _1. Thus, the fuel supply pipe 22 of the second evaporated fuel passage 27 ₁
Opening 27a ₁ of the inner is opposed to the negative pressure introduction hole 3a in the nozzle 3 of the fuel filling gun G, which is inserted into the fuel supply port 22a
And communicates with, therefore the negative pressure introduction hole 3a, will be vaporized fuel from the second fuel vapor path 27 ₁ is aspirated fuel vapor is sucked into the fuel gun in G is a fuel tank with fuel It is discharged toward T. Thus some of the fuel vapor, will be circulated from the second fuel vapor path 27 ₁ to the negative pressure introduction hole 3a and through the oil supply gun G refueling tank T, the emission to the outside from the oil supply pipe 22 of the fuel vapor It is possible to prevent as much as possible,
As a result, the amount of air sucked into the fuel supply pipe 22 with the refueling can be reduced to reduce the amount of evaporative fuel generated in the fuel tank T, thereby contributing to downsizing of the canister C.

Further, the second evaporative fuel passage 27 ₁ is formed to have a small diameter that restricts the flow of the evaporative fuel, so that the evaporative fuel guided from the second evaporative fuel passage 27 ₁ to the fuel supply pipe 22 is restricted. Thus, it is possible to effectively prevent the surplus evaporated fuel that is not sucked into the air passage 15 from the negative pressure introducing hole 3a from being discharged to the outside.

FIGS. 3 and 4 show a second embodiment of the present invention. FIG. 3 is a sectional view showing the vicinity of an oil supply port of an oil supply pipe, and FIG. 4 is a perspective view of a guide member.

A guide member 28 for mounting the tip of the nozzle 3 of the refueling gun G is mounted on the lower surface of the refueling port 22a of the refueling pipe 22. The guide member 28 is inclined so as to move away from the inner surface of the oil supply pipe 22 as it goes inward in the axial direction of the oil supply pipe 22, and has an upper surface 28 formed in an arc-shaped cross section so as to receive the lower end of the tip of the nozzle 3.
a in the state of being attached to the oil supply pipe 22,
Between the guide members 28 and the oil supply pipe 22, the fuel vapor chamber 29 communicating with the second fuel vapor path 27 ₁ is formed. Moreover, the upper surface 28a of the guide member 28 is
A plurality of connection holes 30 ₁ communicating in common to the first evaporative fuel path 27 ₁ through 30 _2, 30 ₃ is opened at an interval in the axial direction of the fuel supply pipe 22, which connecting holes 30 _1, 30 _2,
30 ₃ constitutes an opening of the present invention. The guide member 2
8 has a passage 3 leading to the fuel vapor chamber 29.
1 is provided.

According to the second embodiment, the tip of the nozzle 3 of the refueling gun G is placed on the upper surface 28a of the guide member 28, so that the connection hole 30 is formed in accordance with the insertion depth of the nozzle 3 into the refueling pipe 22. _1, 30 _2, 30 ₃ or the can be Ren'nara reliably to face the negative pressure introduction hole 3a, it is possible to further improve the release effect of preventing the outside of the fuel vapor. Moreover, when the fuel level rises in the fuel supply pipe 22, the fuel can be introduced into the evaporative fuel chamber 29 from the passage 31, so that the negative pressure introduction hole 3a is closed with the fuel and the fuel gun G is provided with an automatic stop function. Can be demonstrated.

FIG. 5 shows a third embodiment of the present invention, and portions corresponding to the above embodiments are given the same reference numerals.

First evaporated fuel passage 2 leading to canister C
3 a second evaporative fuel path 27 _{and second} end having an equivalent cross-sectional area in communication with the upper space in the fuel tank T, the second end of the fuel vapor passage 27 _2, the negative pressure introduction nozzle 3 during refueling The portion corresponding to the hole 3a is connected to the oil supply pipe 22. Thus the midway of the second evaporative fuel path 27 _2, the aperture 32 is provided as a limiting means for limiting the fuel vapor flow rate. Like this
Also in this embodiment , refueling of the second evaporated fuel passage 27 ₂
Opening 27a ₂ into the tube 22, the fuel supply port 22a during refueling
Of negative pressure in nozzle 3 of refueling gun G inserted in
It is arranged so as to face and communicate with the inlet 3a.

[0025] According to the third embodiment, without a large amount of fuel vapor to the filler tube 22 from the second fuel vapor passage 27 ₂ flows, released more effectively to the outside from the oil supply pipe 22 of the fuel vapor Is prevented.

[0026] The diaphragm 32 may be provided at any position in the second evaporative fuel passage 27 _2.

FIG. 6 shows a fourth embodiment of the present invention, and portions corresponding to the above embodiments are given the same reference numerals.

[0028] in the middle of the ₂ second evaporative fuel path 27 connecting the portion corresponding to the negative pressure introduction hole 3a of the upper space and the fuel supply pipe 22 in the fuel tank T is differential pressure regulating valve 33 as a limiting means is interposed You. The differential pressure valve 33 includes a valve body 35 that can open and close a valve hole 34 communicating with the fuel tank T, and a spring 36 that urges the valve body 35 in a direction to close the valve hole 34. The valve opens when the internal pressure becomes equal to or higher than a predetermined pressure. Thus, also in this embodiment, the second evaporated fuel passage
Opening 27a ₂ to the road-27 ₂ of the oil supply pipe 22, during refueling
Nozzle 3 of refueling gun G inserted in refueling port 22a
Arranged so as to face and communicate with the negative pressure introducing hole 3a
Is done.

According to the fourth embodiment, when the refueling speed of the refueling gun G is relatively low and the amount of air entrained from the refueling port 22a is relatively small, the release of the fuel vapor from the refueling port 22a to the atmosphere is prevented. to, until the pressure in the fuel tank T is equal to or greater than the predetermined pressure may be kept closed second evaporative fuel path 27 _2.

The differential pressure valve 33 is, as shown in FIG.
It may be provided to the second one of the position of the fuel vapor passage 27 _2.

FIG. 8 shows a fifth embodiment of the present invention, and portions corresponding to the above-described embodiments are denoted by the same reference numerals.

[0032] in the middle of the ₂ second evaporative fuel path 27 connecting the portion corresponding to the negative pressure introduction hole 3a of the upper space and the fuel supply pipe 22 in the fuel tank T, the control valve 37 as a limiting means is interposed You. The control valve 37 is configured to increase its opening degree as the pressure in the fuel tank T increases, and a valve communicating with the upper space of the fuel tank T is provided in a housing 38 of the control valve 37. A chamber 39, a spring chamber 40 communicating with the oil supply pipe 22, and a pressure chamber 41 are formed. That is, the valve chamber 39 and the spring chamber 40 are partitioned by a partition 43 having a valve hole 42 and fixed to the housing 38,
The pressure chamber 41 and the pressure chamber 41 are defined by a diaphragm 44 whose peripheral edge is supported by a housing 38. In the valve chamber 39, a valve body 45 capable of changing the opening degree of the valve hole 42 is provided.
4 and is housed in the spring chamber 40.
A spring 46 for urging the diaphragm 44 is housed on the side of reducing the volume of the pressure chamber 41.
It is communicated in the middle of the evaporative fuel passage 23.

In such a control valve 37, the fuel tank T
The diaphragm 44 is displaced downward in FIG. 8 in accordance with the internal pressure, that is, the pressure increase in the first evaporative fuel passage 23, whereby the valve body 45 is driven in a direction to increase the opening degree of the valve hole 42. . Thus, also in this embodiment, the second evaporation
Opening 27a ₂ into the oil supply pipe 22 of the fuel passage 27 _2,
The refueling gun G inserted into the refueling port 22a during refueling
To communicate with the negative pressure introducing hole 3a in the chisel 3
Placed in

[0034] According to the fifth embodiment, it is possible to increase the evaporative fuel flow rate flowing through the second fuel vapor passage 27 ₂ in response to an increase refueling quantity into the fuel tank T during fueling by fueling gun G, The discharge of the evaporated fuel from the fuel supply pipe 22 to the outside is more effectively prevented in accordance with the fuel supply amount.

Although the embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the appended claims. It is possible to do.

[0036]

As described above, according to the first aspect of the present invention, the opening of the other end of the evaporative fuel passage having one end communicating with the upper space in the fuel tank into the fuel supply pipe is formed. Is paid
So that it communicates with the negative pressure introduction hole of the refueling gun during oiling
Refueling before the fuel level reaches the negative pressure inlet
Inside, the fuel vapor passes through the opening and the negative pressure introduction hole.
The evaporative fuel is drawn into the refueling gun from the
Into the fuel passage and the supply fuel flowing toward the refueling gun.
During refueling, the upper part of the fuel tank evaporates.
The fuel passes through the evaporative fuel passage and the refueling gun into the fuel tank.
Therefore, even if the seal used conventionally is not used, or even if the used seal is incomplete, the discharge of the fuel vapor in the fuel tank from the fuel supply pipe to the outside at the time of refueling is minimized. Prevention and refueling
To reduce the amount of air sucked into the oil supply pipe
Thus, it is possible to reduce the amount of evaporative fuel generated in the engine and contribute to downsizing of the canister.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the invention, the fuel vapor passage has a cross-sectional area which itself restricts the flow of fuel vapor, or Since there is provided a restricting means for restricting the flow of the evaporative fuel, it is possible to prevent the evaporative fuel from flowing unnecessarily to the fuel supply pipe side and effectively discharge the surplus evaporative fuel that is not sucked into the negative pressure introduction hole to the outside. Can be prevented.

According to a third aspect of the present invention, in addition to the configuration of the first aspect of the present invention, a guide member for mounting a tip of a nozzle at the time of refueling is provided in the oil supply pipe, and a guide member is provided on an upper surface of the guide member. In the front , a plurality of connection holes commonly communicating with the fuel vapor passage are opened at intervals in the axial direction of
Runode configure the serial opening, the opening of the fuel vapor passage negative pressure introduction hole according to the insertion depth of the feeding line of the nozzle of the fuel filling gun
Parts to face can be reliably communicated to, it is possible to more effectively prevent the release to the outside of the fuel vapor.

[Brief description of the drawings]

FIG. 1 is a cutaway sectional view showing a configuration of a fuel vapor processing apparatus according to a first embodiment.

FIG. 2 is a sectional view of a refueling gun.

FIG. 3 is a cross-sectional view showing the vicinity of an oil supply port of an oil supply pipe according to a second embodiment.

FIG. 4 is a perspective view of a guide member.

FIG. 5 is a cutaway sectional view corresponding to FIG. 1 of a third embodiment.

FIG. 6 is a cutaway sectional view corresponding to FIG. 1 of a fourth embodiment.

FIG. 7 is a cutaway sectional view showing a modification of the fourth embodiment.

FIG. 8 is a cutaway sectional view corresponding to FIG. 1 of a fifth embodiment.

[Explanation of symbols]

3 Nozzle 3a Negative pressure introducing hole 22 Oil supply pipe 27 ₁ , 27 ₂ Evaporated fuel passage 27 a ₁ , 27 a ₂ Opening 28 Guide member 30 ₁ , 30 ₂ , 30 ₃ ... Connection hole as opening 32 ... Restrictor as restricting means 33 ... Differential pressure valve as restricting means 37 ... Control valve as restricting means C ... Canister G ...・ Refueling gun T ・ ・ ・ Fuel tank V ・ ・ ・ On / off valve

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Teruo Wakagi 1-4-1 Chuo, Wako-shi, Saitama Pref. Honda R & D Co., Ltd. (72) Takeshi Hara 1-4-1 Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Inventor Tomoyuki Kawakami 143 Hagadai, Haga-cho, Haga-gun, Tochigi Pref. (JP, U) J. 50-26815 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02M 25/08 F02M 33/00

Claims (3)

(57) [Claims] 1. A fuel tank (T) having a fuel pipe (22) extending upward, a canister (C) for adsorbing fuel vapor from the fuel tank (T), and inserted into the fuel pipe (22). The valve is opened at the time of refueling by a refueling gun (G) which automatically stops fuel supply in response to a fuel level reaching a negative pressure introducing hole (3a) provided at a lower part of the tip of the nozzle (3). An on-off valve (V) communicating between the fuel tank (T) and the canister (C ), and an upper space in the fuel tank (T)
To one end and the other end to the oil supply pipe (22).
Evaporative fuel passage is opened to (27 _1, 27 ₂₎ in the fuel vapor processing apparatus comprising, said evaporative fuel path (27 _1, 27 ₂₎ oil pipe (22)
Opening to the inner _{(27a 1, 27a 2, 30} 1 ~30 3)
When the opening is filled with the negative pressure of the refueling gun (G) when refueling.
The fuel supply is arranged so as to face and communicate with the hole (3a), and before the fuel level reaches the negative pressure introduction hole (3a).
During the opening _{(27a 1, 27a 2, 30} 1 ~3
0 ₃ ) and the negative pressure introducing hole (3a).
Evaporated fuel is supplied from the road (27 ₁ , 27 ₂ ) into the fuel gun (G).
And refuel inside the fuel passage (5) of the gun (G).
An evaporative fuel treatment apparatus characterized by combining with supply fuel flowing toward a gun (G) . 2. The evaporative fuel passage (27 ₁ , 27 ₂ )
2. An evaporative fuel treatment system according to claim 1, wherein the evaporative fuel treatment device has a cross-sectional area for restricting the flow of evaporative fuel, or has a restricting means for restricting the flow of evaporative fuel. apparatus. 3. A guide member (28) on which the tip of the nozzle (3) for refueling is mounted is provided in the refueling pipe (22), and an upper surface of the guide member (28) has an evaporative fuel passage (27 ₁ ).
Connecting holes (30 ₁ , 30 ₂ , 3
0 ₃ ), wherein the opening is formed by being opened at an interval in the axial direction of the oil supply pipe (22).
The evaporative fuel treatment device according to any one of the preceding claims.