JP2012211539A - Fuel vapor treating device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the outflow of fuel vapor from a fuel tank of a vehicle to the air by a simple structure.SOLUTION: An oil supply cap 4 is provided with a communication chamber 25 connecting a charge passage 5 with the inside of the fuel tank 2, and the communication chamber 25 is provided with an on-off valve (26) to be opened when the internal pressure in the fuel tank 2 reaches predetermined pressure to connect the fuel tank 2 and an fuel vapor reservoir. Further the oil supply cap 4 is provided with a pressure relieving mechanism 43 for opening the on-off valve in conjunction with preliminary operation previous to opening of the oil supply cap 4, and is provided with a locking pin 47 for moving forward or backward depending on the internal pressure in the fuel tank 2 to permit or prohibit rotation of a key cylinder 20.

Description

  The present invention relates to an evaporative fuel processing apparatus for a vehicle that guides evaporative fuel generated inside a fuel tank to the outside of the fuel tank.

  In Patent Document 1, in a fuel vapor processing apparatus for a vehicle equipped with a sealed fuel tank, the tank is electronically controlled to prevent the fuel vapor or fuel from flowing out of the fuel tank when refueling when the tank internal pressure is high. A system for controlling internal pressure is disclosed.

JP 2004-156696 A

  The system according to Patent Document 1 can be suitably used in a relatively large four-wheel vehicle or the like, but requires a small space and is inexpensive, and is applicable to a motorcycle or the like that directly opens and closes a fuel filler port by key operation. There is a difficult point.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle evaporative fuel treatment apparatus that can be used suitably for a small vehicle by suppressing the evaporative fuel from flowing out to the atmosphere with a simple structure.

As a means for solving the above problems, the invention according to claim 1 is attached to a fuel tank (2) for storing fuel and a fuel filler port (3) of the fuel tank (2), and is inserted into a key cylinder (20). A fuel supply cap (4) that can be opened and closed from the fuel supply port (3) by operating the inserted key (49), an evaporative fuel reservoir (6) that adsorbs and stores evaporative fuel with an adsorbent, and the fuel A charge passage (5) for communicating the tank (2) and the evaporated fuel reservoir (6), and a purge passage (8) for communicating the evaporated fuel reservoir (6) and the intake system (7) of the internal combustion engine The fuel supply cap (4) is provided with a communication chamber (25) that allows the charge passage (5) and the fuel tank (2) to communicate with each other. The chamber (25) contains the fuel tank An open / close valve is provided that opens when the internal pressure of (2) reaches a predetermined pressure and communicates the fuel tank (2) and the evaporated fuel reservoir (6). The fuel supply cap (4) A pressure relief mechanism (43, 61, 100, 300) for opening the on-off valve in conjunction with a preliminary operation for opening the fuel cap (4) is provided, and according to the internal pressure of the fuel tank (2). A locking mechanism (47, 131) for allowing or prohibiting the refueling cap (4) opening operation is provided, and the locking mechanism (47, 131) detects the pressure in the fuel tank (2). A pressure determination mechanism, and when the pressure in the fuel tank (2) becomes a predetermined pressure after the pressure release by the pressure release mechanism (43, 61, 100, 300), the pressure determination mechanism Locking mechanism (47, 131) Divided, characterized in that it is configured to permit opening movement of the fuel cap (4).
According to a second aspect of the present invention, the locking mechanism (47, 131) is displaced in accordance with the rotation of the key cylinder (20) or the rotation of the key cylinder (20), so that the oil supply cap (4 ) Is permitted or prohibited from operating the slider (141) that engages the fuel tank (2).
According to a third aspect of the present invention, the pressure determination mechanism includes a communication passage that communicates the inside of the fuel tank (2) and the outside of the fuel tank (2), and the inside and outside of the fuel tank (2) provided in the communication passage. The locking mechanism operates in conjunction with the pressure sensing member, and allows or prohibits the rotation of the key cylinder (20) or the operation of the slider (141). It is comprised so that it may do.
According to a fourth aspect of the present invention, the pressure sensing member includes a diaphragm or a piston provided in the communication path, and a rotation of the key cylinder (20) or an operation of the slider (141) coupled to the diaphragm or the piston. And a biasing member that biases the diaphragm or the piston so that the locking pin allows rotation of the key cylinder (20) or operation of the slider (141). When the internal pressure of the fuel tank (2) is equal to or higher than a predetermined pressure, the locking pin engages with the key cylinder (20) or the slider (141), and the internal pressure of the fuel tank (2) is equal to or lower than the predetermined pressure. The locking pin is configured to be detached from the key cylinder (20) or the slider (141) by the biasing member. And features.
According to a fifth aspect of the present invention, the pressure determination mechanism includes a communication passage that communicates the inside of the fuel tank (2) and the outside of the fuel tank (2) of the communication chamber (25) in which the on-off valve is provided. A flow rate sensing member that senses and operates the flow rate of the evaporated fuel flowing through the on-off valve when the on-off valve is provided in the communication path, and the locking mechanism (47) is interlocked with the flow rate sensing member. It is configured to operate and to allow or prohibit the rotation of the key cylinder (20) or the operation of the slider (141).
According to a sixth aspect of the present invention, the flow velocity sensing member includes a diaphragm or a piston provided in the communication path, an operating pin coupled to the diaphragm or the piston, and the key cylinder (20) attached to the operating pin. A locking member that allows or prohibits rotation of the slider or the operation of the slider (141), and the diaphragm or piston is attached so that the locking member allows rotation of the key cylinder (20) or operation of the slider (141). The communication chamber is formed in a small-diameter cylindrical shape, and when the open / close valve is opened and the flow rate of the evaporated fuel is generated in the communication passage, the diaphragm or piston is connected to the communication chamber. (25) is displaced, the lock member is engaged with the key cylinder (20) or the slider (141), and the flow rate of the evaporated fuel is increased. No If the state had not been characterized in that it is configured to unlock the locking member the key cylinder by the biasing member (20) or said slider (141).
The invention according to claim 7 is characterized in that the preliminary operation for opening the fuel cap (4) is a pushing operation by inserting the key cylinder (20).
The invention according to claim 8 is characterized in that the preliminary operation before opening the fuel cap (4) is a rotation operation by rotation of the key cylinder (20) after inserting the key.
The invention according to claim 9 is characterized in that the preliminary operation for opening the fuel cap (4) is an opening / closing operation of a key cover covering the key insertion hole of the key cylinder (20).
According to a tenth aspect of the present invention, the locking mechanism (47) is a movable claw provided on the oil supply cap (4) and engaged with the key cylinder (20) or the slider (141). When the internal pressure of the fuel tank (2) is equal to or higher than a predetermined pressure, the movable claw engages with the key cylinder (20) or the slider (141), and the internal pressure of the fuel tank (2) becomes lower than the predetermined pressure. In this case, the urging member is configured to be detached from the key cylinder (20) or the slider (141).

  According to the present invention, the internal pressure of the fuel tank can be lowered in conjunction with the preliminary operation of opening the fuel cap with a simple structure, and the key cylinder can be allowed to rotate after the tank internal pressure has decreased, The evaporative fuel or liquid fuel can be prevented from flowing out to the atmosphere.

It is a figure which shows schematic structure of the evaporative fuel processing apparatus which concerns on the 1st Embodiment of this invention. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on 1st Embodiment. It is a top view of the fuel supply cap which concerns on the evaporative fuel processing apparatus which concerns on 1st Embodiment. It is sectional drawing of the periphery site | part of the positive pressure regulating valve provided in the fuel supply cap which concerns on the evaporated fuel processing apparatus which concerns on 1st Embodiment. It is a figure explaining the operating method of the evaporative fuel processing apparatus which concerns on 1st Embodiment. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on the 3rd Embodiment of this invention. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on the 4th Embodiment of this invention. It is a perspective view of the key cylinder and press piece in the fuel supply cap which concerns on the evaporative fuel processing apparatus which concerns on 4th Embodiment. It is a figure explaining the operating method of the evaporative fuel processing apparatus which concerns on 4th Embodiment. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on the 5th Embodiment of this invention. It is a figure explaining the operating method of the evaporative fuel processing apparatus which concerns on 5th Embodiment. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on the 6th Embodiment of this invention. It is sectional drawing of the oil supply cap which concerns on the evaporative fuel processing apparatus which concerns on the 7th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used in the following description, UP indicates the upper side and FR indicates the front side. For convenience of description, the following embodiment will be described based on these directions.

<First Embodiment>
FIG. 1 shows a schematic configuration of an evaporative fuel processing apparatus 1 according to a first embodiment applied to a fuel tank for a motorcycle. The evaporative fuel processing apparatus 1 includes a fuel tank 2 and a fuel tank 2. A fuel cap 4 attached to the fuel filler port 3 so as to be openable and closable; a charge pipe 5 penetrating the fuel tank 2 and connected to the fuel cap 4; an evaporative fuel reservoir 6 connected to the charge pipe 5 outside the fuel tank 2; The evaporative fuel reservoir 6 and the intake system 7 are connected to each other, and a purge pipe 8 is provided. The evaporative fuel reservoir 6 is provided with a drain pipe 6A for sucking air.

  As shown in FIG. 2, the fuel tank 2 is formed with a concave seat portion 9 in a sectional view bent and recessed from the upper outer wall, and the fuel filler port 3 has a circular shape in a plan view (top view). Are formed in a substantially central region. The charge pipe 5 communicates with the inside of the fuel tank 2 through the fuel supply cap 4 and sends the evaporated fuel generated inside the fuel tank 2 to the evaporated fuel reservoir 6. The evaporative fuel reservoir 6 has an adsorbent inside, and adsorbs and stores the evaporative fuel supplied from the charge pipe 5.

  The oil filler cap 4 includes an annular outer frame portion 10 fixed to the seat portion 9 and a cap body 11 disposed inside the outer frame portion 10. The outer frame portion 10 has a plurality of counterbore holes. 12 is formed. The oil filler cap 4 is fixed to the seat portion 9 by inserting a bolt into the counterbore 12 of the outer frame portion 10. The cap body 11 is connected to the outer frame portion 10 by a hinge 13 and can be opened and closed in the direction of the rotation arrow A in the figure.

  A cylindrical body cap 14 is provided on the lower surface of the cap main body 11, and the body cap 14 integrally has a flange portion 15 at an upper end edge, and the lower surface of the cap main body 11 by a plurality of screws 15 </ b> A penetrating the flange portion 15. It is fixed to. The body cap 14 is fitted with a sealing material 18 </ b> A made of a resin material pressed against the inner peripheral surface of the fuel filler opening 3. A guide cap 16 is fitted into the body cap 14 on the inner peripheral side of the sealing material 18A. The guide cap 16 is urged downward by a spring 17 whose one end is in contact with the inner peripheral side of the flange portion 15 of the body cap 14.

  The position of the guide cap 16 is regulated by bending the upper end portion in the outer peripheral direction and bringing the bent portion into contact with the sealing material 18A hanging from the outer peripheral side of the flange portion 15 of the body cap 14. In the figure, reference numeral 18B denotes a fixing member for fixing the sealing material 18A.

  A key cover 19 that opens and closes in the direction of the rotation arrow B in the figure is connected to the upper portion of the cap body 11 by a hinge 19A, and the key cover 19 exposes the key cylinder 20 to the outside. The key cylinder 20 is accommodated in a cylinder chamber 21 formed in the body cap 14 so that the key hole faces upward. The key cylinder 20 is in contact with a mount member 23 made of a resin material provided in the cylinder chamber 21 on the lower side, and can be pushed in by the amount of compression of the mount member 23 by inserting the inserted key.

  The key cylinder 20 is released from the locked state of the cap body 11 by inserting a key and being displaced and rotated downward. Specifically, the key cylinder 20 is provided with a locking piece (slider) (not shown) that moves forward and backward in the radial direction of the key cylinder 20 in accordance with the rotation of the key, and this locking piece is provided in the fuel tank 2. Further, the cap body 11 is prevented from being opened by being locked to a stop portion (not shown).

  A communication chamber 25 extending in parallel with the cylinder chamber 21 is formed on the side of the cylinder chamber 21 of the body cap 14, and a lower end portion of the communication chamber 25 is opened inside the fuel tank 2 so that evaporated fuel can pass through. For example, it is covered with a mesh-like filter member 24. The upper end of the communication chamber 25 is closed by the lower surface of the cap body 11.

  Referring to FIG. 3, the communication chamber 25 includes a pair of adjacent cylindrical portions 25A and 25B formed so as to be bored in the body cap 14, and the negative pressure regulating valve 26 is provided in the cylindrical portion 25A. A positive pressure regulating valve 27 is provided in the cylindrical portion 25B. The communication chamber 25 is separated into a lower fuel tank 2 inner side and an upper fuel tank 2 outer side by the negative pressure adjusting valve 26 and the positive pressure adjusting valve 27. The negative pressure adjustment valve 26 is urged by a predetermined urging force from the inside of the fuel tank 2 and opens when the internal pressure of the fuel tank 2 becomes equal to or lower than the predetermined pressure. The positive pressure adjustment valve 27 is connected to the outside of the fuel tank 2. And is opened when the internal pressure of the fuel tank 2 exceeds a predetermined pressure. Here, the negative pressure adjustment valve 26 and the positive pressure adjustment valve 27 are arranged on the opposite side of the hinge 13 with respect to the key cylinder 20.

  As shown in FIG. 2, the negative pressure adjusting valve 26 is fitted into a valve seat 28 having a hole portion 28A formed so as to protrude from the inner peripheral surface of the cylindrical portion 25A in the inner diameter direction, and the hole portion 28A of the valve seat 28. A valve body 31 having a shaft portion 29 to be inserted, and a valve body 31 having an umbrella portion 30 that comes into contact with the valve seat 28 from the inside of the fuel tank 2 and is coupled to the lower end of the shaft portion 29, and one end abuts against the filter member 24. It comprises a spring 32 that abuts against the umbrella portion 30 of the valve body 31 and biases it. The spring 32 is provided to be contracted between the filter member 24 and the valve body 31 and applies a predetermined urging force to the valve body 31.

  On the other hand, as shown in FIG. 4, the positive pressure adjusting valve 27 is formed in a valve seat 33 having a hole 33A formed so as to protrude from the inner peripheral surface of the cylindrical portion 25B in the inner diameter direction, and in the hole 33A of the valve seat 33. A shaft body 34 to be inserted and a valve body 36 having an umbrella portion 35 coupled to the valve seat 33 from the outside of the fuel tank 2 and coupled to the upper end of the shaft section 34, one end abutting against the lower surface of the cap body 11, and the other end And a spring 37 that presses against the umbrella portion 35 of the valve body 36, and the shaft portion 34 projects downward from the valve seat 33 when the positive pressure regulating valve 27 is closed, as shown in FIG. The spring 37 is provided to be contracted between the cap body 11 and the valve body 36 and applies a predetermined urging force to the valve body 36.

  An inclined portion 38 that integrally expands (increases) the inner diameter of the hole 33A as it goes downward is formed integrally with the lower portion of the valve seat 33. The tubular portion 25B has a valve seat 33 below the valve seat 33. A spherical rollover valve 50 is accommodated between 33 and the filter member 24. The rollover valve 50 has a diameter (diameter) that is set to be slightly smaller than the diameter of the cylindrical portion 25B so that the evaporated fuel can pass through. The rollover valve 50 enters when the fuel tank 2 is inclined at a predetermined angle or more. Also pushed by the fuel, the shaft portion 29 of the positive pressure regulating valve 27 is pushed up to close the valve seat 33 (inclined portion 38) to prevent the fuel from flowing out. Here, the rollover valve 50 is brought into contact with the inclined portion 38 to improve the adhesion between them.

  Referring to FIG. 2, the upper ends of the cylindrical portions 25 </ b> A and 25 </ b> B are closed by the lower surface of the cap body 11, while the cylindrical portions separated from the inside of the fuel tank 2 by the negative pressure adjustment valve 26 and the positive pressure adjustment valve 27. The upper side spaces of 25A and 25B communicate with each other, and an in-cap charge passage 39 extending in the radial direction of the flange portion 15 is formed from the upper inner peripheral surface of the cylindrical portion 25A. The in-cap charge passage 39 penetrates the inside of the flange portion 15 and opens downward in a space formed between the cap body 11 and the seat portion 9.

  A cylindrical elastic member 40 having a cylindrical shape is airtightly coupled to the opening facing the lower side of the in-cap charge passage 39 when the fuel supply cap 4 is closed. The lower end portion of the cylindrical elastic member 40 is in close contact with the seat portion 9 with the cap body 11 closed, and covers the communication opening 41 formed in the seat portion 9. The communication opening 41 is a hole penetrating from the seat portion 9 into the fuel tank 2 and is airtightly connected to the charge pipe 5 disposed inside the fuel tank 2. As a result, a path from the fuel tank 2 to the evaporated fuel reservoir 6 is formed.

  As shown in FIG. 2, the body cap 14 is provided with a through hole 42 that allows the upper part of the cylinder chamber 21 and the upper part of the cylindrical part 25 </ b> A to communicate with each other, and a pressing piece 43 is inserted into the through hole 42. The body cap 14 is formed with a diaphragm chamber 44 that allows the lower portion of the cylinder chamber 21 and the lower portion of the communication chamber 25 to communicate with each other.

  The through hole 42 opens to the outside of the fuel tank 2 of the cylindrical portion 25 </ b> A partitioned by the negative pressure regulating valve 26, and the pressing piece 43 fixes one end to the key cylinder 20 and the other end into the communication chamber 25. It arrange | positions so that it may face and contact | abuts to the upper end of the axial part 29 of the valve body 31 of the negative pressure adjustment valve 26. FIG. This pressing piece 43 is displaced downward in conjunction with the downward movement of the key cylinder 20, thereby pushing down the valve body 31 downward and forcibly opening the negative pressure adjusting valve 26. The through hole 42 is provided with a seal 43 </ b> A that allows the pressing piece 43 to pass therethrough and fills the gap between the through hole 42 and the pressing piece 43.

  On the other hand, the diaphragm chamber 44 is formed so as to be recessed from the inside of the fuel tank 2 to the key cylinder 20 side of the cylindrical portion 25 </ b> A partitioned by the negative pressure regulating valve 26, and has a communication passage 44 </ b> A penetrating into the cylinder chamber 21. It communicates with the cylinder chamber 21. A diaphragm 45 is provided in the diaphragm chamber 44, and the cylinder chamber 21 side of the diaphragm chamber 44 is separated from the inside of the fuel tank 2 with the diaphragm 45 interposed therebetween.

  A concave engagement groove 46 is formed on the outer peripheral surface of the key cylinder 20 in the cylinder chamber 21 on the extension of the communication path 44A, and an engagement pin 47 engageable with the engagement groove 46 is coupled to the diaphragm 45. ing. A biasing member 48 that biases the diaphragm 45 in a direction in which the engagement pin 47 is not engaged with the engagement groove 46 against the internal pressure of the fuel tank 2 is accommodated on the side of the communication passage 44 </ b> A in the diaphragm chamber 44. Yes. Thereby, when the internal pressure of the fuel tank 2 is high, the engagement pin 47 engages with the engagement groove 46 by the diaphragm 45 compressing the urging member 48 and restricts the rotation of the key cylinder 20. Further, when the internal pressure of the fuel tank 2 is leveled with the atmosphere, the engagement pin 47 releases the engagement with the engagement groove 46 by the diaphragm 45 being urged by the urging member 48, and the key cylinder 20 Allow rotation of

  In the fuel vapor processing apparatus 1 having the above configuration, when the internal pressure of the fuel tank 2 becomes equal to or lower than a predetermined pressure and the negative pressure adjustment valve 26 is opened, the fuel tank 2 and the charge pipe 5 pass through the fuel cap 4. Since it communicates, it becomes possible to send the atmosphere from the evaporated fuel reservoir 6 to the fuel tank 2 via the charge pipe 5. Further, when the internal pressure of the fuel tank 2 becomes equal to or higher than a predetermined pressure, the fuel tank 2 and the charge pipe 5 communicate with each other via the fuel cap 4 by opening the positive pressure regulating valve 27. It becomes possible to send the evaporated fuel generated in the fuel 2 to the evaporated fuel reservoir 6 through the charge pipe 5.

  Further, referring to FIG. 5, when the key cylinder 20 is pushed down by the key 49 inserted into the key cylinder 20, the pressing piece 43 pushes down the valve body 31 of the negative pressure adjusting valve 26, and the negative pressure adjusting valve 26 is Opened. When the negative pressure regulating valve 26 is thus opened, the internal pressure in the fuel tank 2 is changed to the cylindrical portion 25A, the in-cap charge passage 39, the cylindrical elastic member 40, and the charge, as indicated by the arrow in the figure. It goes out to the evaporative fuel reservoir 6 side via the pipe 5. When the internal pressure of the fuel tank 2 decreases, the engagement pin 47 moves in the direction of the arrow in the drawing to release the engagement with the engagement groove 46, allowing the key cylinder 20 to rotate and opening the fuel supply cap 4. It becomes possible. Although the slider is not shown, the operation of the slider is indirectly permitted by allowing the key cylinder 20 to rotate.

  According to the evaporative fuel processing apparatus 1 according to the present embodiment described above, the internal pressure of the fuel tank 2 is lowered in conjunction with the preliminary operation of opening the fuel supply cap 4 with a simple structure, and the tank internal pressure decreases. The rotation of the key cylinder 20 can be allowed, and the evaporative fuel or liquid fuel can be prevented from flowing out to the atmosphere.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 6, in this embodiment, a through hole 60 is provided between the cylinder chamber 21 and the cylindrical portion 25A in the body cap 14, and the through hole 60 is partitioned by the negative pressure adjusting valve 26 (valve seat 28). It opens to the inside of the fuel tank 2 of the cylindrical portion 25A. The pressing piece 61 inserted through the through-hole 60 has one end fixed to the key cylinder 20 and the other end facing the tubular portion 25A so as to contact the umbrella portion 30 of the valve body 31 from above. The other end of the pressing piece 61 is sandwiched between the valve seat 28 and the umbrella portion 30 of the valve body 31, and the airtightness is maintained in this state. The pressing piece 61 is moved downward in conjunction with the downward movement of the key cylinder 20. Displace. In the configuration of this embodiment, the axial length of the cylinder chamber 21 of the body cap 14 can be shortened.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. In the present embodiment, the configuration of the diaphragm 45 is different from that of the first embodiment. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 7, in the present embodiment, a diaphragm chamber 64 is formed in the body cap 14 so as to straddle the key cylinder 20 and the cylindrical portion 25A as in the first embodiment. The diaphragm chamber 64 is formed so as to be recessed from the inside of the fuel tank 2 to the key cylinder 20 side of the cylindrical portion 25A partitioned by the negative pressure regulating valve 26, and has a communication passage 64A penetrating into the cylinder chamber 21 to have a cylinder chamber. 21 communicates. On the fuel tank 2 side in the diaphragm chamber 64, a biasing member 65 that biases the diaphragm 45 in a direction to engage the engagement pin 47 with the engagement groove 46 against the air pressure on the communication path 44A side is provided. ing. One end of the urging member 65 is supported by a convex piece 66 formed at the edge of the diaphragm chamber 64 on the fuel tank 2 side.

  In the configuration according to this embodiment, when the internal pressure of the fuel tank 2 is high, the diaphragm 45 receives the tank internal pressure and is urged by the urging member 48 so that the engagement pin 47 engages with the engagement groove 46. The rotation of the key cylinder 20 is restricted. When the internal pressure of the fuel tank 2 becomes low and falls below the pressure on the communication path 44A side, the diaphragm 45 is displaced against the urging force of the urging member 48, and the engagement pin 47 and the engagement groove 46 are displaced. The key cylinder 20 is allowed to rotate by releasing the engagement with the key cylinder 20.

<Fourth Embodiment>
Next, a fourth embodiment of the present invention will be described. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In the present embodiment, as shown in FIG. 8, the linking member 100 is inserted through a through hole 42 formed in the body cap 14 that allows the upper portion of the cylinder chamber 21 and the upper portion of the cylindrical portion 25A to communicate with each other. The through hole 42 opens to the outside of the fuel tank 2 of the cylindrical portion 25A partitioned by the negative pressure regulating valve 26. The linkage member 100 engages one end with the key cylinder 20 and the other end within the communication chamber 25. Is arranged so as to contact the upper end of the shaft portion 29 of the valve element 31 of the negative pressure adjusting valve 26. The linking member 100 is displaced downward in conjunction with the rotation operation of the key cylinder 20, thereby pushing down the valve body 31 downward to forcibly open the negative pressure adjusting valve 26.

  FIG. 9 shows the structure of the key cylinder 20 and the linking member 100. A groove 101 extending obliquely is formed in the key cylinder 20, and one end of the linkage member 100 is engaged with the groove 101. As shown in FIG. 9A, the key 49 is inserted into the key cylinder 20, and the key cylinder 20 is rotated in the direction of the rotation arrow in the figure, so that the linkage member 100 becomes the groove 101 as shown in FIG. Displaced downward along Thereby, the valve body 31 is pushed down.

  In this embodiment, when the linkage member 100 is pushed down by rotating the key 49 inserted into the key cylinder 20, the linkage member 100 pushes down the valve body 31 of the negative pressure adjusting valve 26 as shown in FIG. The negative pressure adjustment valve 26 is opened. When the negative pressure regulating valve 26 is opened in this way, the internal pressure in the fuel tank 2 is passed through the cylindrical portion 25A, the in-cap charge passage 39, the cylindrical elastic member 40, and the charge pipe 5, and the evaporated fuel reservoir. Exit to the 6th side. When the internal pressure is released and the internal pressure of the fuel tank 2 is lowered, the engagement pin 47 moves in the direction of the arrow in the figure to release the engagement with the engagement groove 46, allowing the key cylinder 20 to rotate, and refueling cap. 4 can be opened.

<Fifth Embodiment>
Next, a fifth embodiment of the present invention will be described. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  In this embodiment, as shown in FIG. 11, a key cover 19 that opens and closes in the direction of the rotation arrow B in the figure is connected to the upper portion of the cap body 11 by a hinge 19 </ b> A. Is exposed to the outside. The key cylinder 20 is accommodated in a cylinder chamber 21 formed in the body cap 14 so that the key hole faces upward. The key cover 19 includes a base 19B connected to the hinge 19A and a cover body 19C that is formed integrally with the base 19B and covers the key hole of the key cylinder 20.

  The upper end portion of the communication chamber 25 is airtight by a linkage member 300 including a pressing plate 301 made of a flexible metal material and an elastic sheet 302 made of a resin material, which is provided immediately below the base portion 19B of the key cover 19. Covered. The pressing plate 301 and the elastic sheet 302 are provided in the cap body 11 so as to close a hole penetrating the cap body 11 below the base portion 19B of the key cover 19.

  The upper end of the shaft portion 29 of the negative pressure adjusting valve 26 is in contact with the elastic sheet 302, the base 19B of the key cover 19 located above the pressing plate 301 and the elastic sheet 302 has a cam shape, and the base 19B has an outer diameter. A pressing portion 19D protruding in the direction is integrally provided. The pressing plate 301 and the elastic sheet 302 are positioned on the rotation locus centering on the hinge 19A of the pressing portion 19D. When the key cover 19 is opened, the pressing portion 19D is displaced downward and the pressing plate 301 and the elastic sheet 302 are located. Press. Therefore, the negative pressure adjusting valve 26 is opened in conjunction with the opening operation of the key cover 19.

  In the present embodiment, when the key cover 19 is opened, as shown in FIG. 12, the base 19B (pressing portion 19D) of the key cover 19 presses the pressing plate 301 and the elastic sheet 302 of the linkage member 300, thereby reducing the negative pressure adjusting valve. The shaft part 29 of the valve body 31 of 26 is pushed down, and the negative pressure adjusting valve 26 is opened. When the negative pressure regulating valve 26 is opened in this way, the internal pressure in the fuel tank 2 is passed through the cylindrical portion 25A, the in-cap charge passage 39, the cylindrical elastic member 40, and the charge pipe 5, and the evaporated fuel reservoir. Exit to the 6th side. When the internal pressure is released and the internal pressure of the fuel tank 2 is lowered, the engagement pin 47 moves in the direction of the arrow in the figure to release the engagement with the engagement groove 46, allowing the key cylinder 20 to rotate, and refueling cap. 4 can be opened.

<Sixth Embodiment>
Next, a sixth embodiment of the present invention will be described. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 13, in the fuel vapor processing apparatus according to this embodiment, a diaphragm chamber 64 is formed in the body cap 14 so as to straddle the key cylinder 20 and the cylindrical portion 25A, as in the third embodiment. The diaphragm chamber 64 has a communication passage 64A penetrating the cylinder chamber 21 and communicates with the cylinder chamber 21. The diaphragm chamber 64 urges the operating pin 131 and the operating pin 131 toward the cylinder chamber 21. A biasing member 65 is provided. A lock member 132 that engages with the key cylinder 20 is attached to the operation pin 131. When the lock member 132 is pulled toward the tubular portion 25A by the diaphragm 64, the lock member 132 is engaged with the key cylinder 20 to restrict the rotation of the key cylinder 20. The lock member 132 is configured to allow the key cylinder 20 to rotate when not being pulled by the diaphragm 64.

  In the configuration of the present embodiment, the cylindrical portion 25A has a small-diameter cylindrical shape, and when the negative pressure adjustment valve 26 is opened, the flow rate of the evaporated fuel is generated in the diaphragm chamber 64. In this case, the diaphragm 64 is in accordance with Bernoulli's theorem. It is displaced toward the communication chamber 25 (tubular portion 25A), and the lock member 132 is pulled. As a result, the lock member 132 restricts the rotation of the key cylinder 20 when a flow velocity is generated in the diaphragm chamber 64, and allows the rotation of the key cylinder 20 when the flow velocity is no longer generated. It becomes possible.

<Seventh Embodiment>
Next, a seventh embodiment of the present invention will be described. Constituent elements in the present embodiment that are the same as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 14, in the present embodiment, the slider 141 that has the basic configuration of the first embodiment is provided at the lower portion of the body cap 14 so as to advance and retract in the outer diameter direction of the key cylinder 20 in accordance with the key rotation operation. Is provided. The slider 141 engages with a predetermined portion inside the fuel tank 2 in the extended state to restrict the opening of the fuel supply cap 4.

  Further, in the present embodiment, the diaphragm 45 or the like is not provided in the diaphragm chamber 44, and a locking mechanism 142 is provided below the slider 141 instead. The locking mechanism 142 is configured by projecting a movable claw 144 that is engaged with the slider 141 from the peripheral edge of a disk-like base portion (piston) 143 that can advance and retreat in the axial direction of the key cylinder 20. The base portion 143 is covered with a bellows-like sheet member 145 on the outer periphery, separated from the inside of the fuel rank 2, and urged by a spring 146 in a direction in which the movable claw 144 is separated.

  The slider 141 is formed with an engagement hole 147 with which the movable claw 144 is engaged. When the internal pressure of the fuel tank 2 is higher than a predetermined pressure, the base portion 143 resists the urging force of the spring 146 upward. Thus, the movable claw 144 is engaged with the engagement hole 147.

  In this embodiment, when the negative pressure adjusting valve 26 is pushed by the pressing piece 43 to be opened and then the pressure inside the fuel tank 2 is lowered, the movable claw 144 is detached from the engaging hole 147 and the fuel supply cap 4 is opened. Is acceptable. In FIG. 14, reference numeral 148 denotes a bar-shaped guide member, and the guide member 148 guides the base portion 143 in the axial direction of the key cylinder 20. In the present embodiment, the movable claw 144 is engaged with the engagement hole 147. However, the guide member 148 is directly engaged with the key cylinder 20 to restrict the rotation of the key cylinder 20. Also good.

  Although the first to seventh embodiments of the present invention have been described above, the present invention is not limited to the above embodiments. For example, although the pressing pieces 43 and 60 and the linking members 100 and 300 have been described as the configuration corresponding to the pressure release mechanism of the present invention, for example, a pressure release mechanism using a latch or the like provided on a lid that covers the oil supply cap is used. May be configured. Moreover, although the structure using a diaphragm was demonstrated in the said embodiment, it may replace with this and may use a piston.

DESCRIPTION OF SYMBOLS 1 Evaporated fuel processing apparatus 2 Fuel tank 5 Charge channel | path 6 Evaporated fuel storage device 8 Purge channel | path 20 Key cylinder 25 Communication chamber 26 Negative pressure regulating valve (open / close valve)
27 Positive pressure regulating valve (open / close valve)
43, 61 Pressing piece (pressure release mechanism)
47 Locking pin 100, 300 Linking member (pressure release mechanism)
131 Actuating pin 141 Slider

Claims (10)

A fuel tank (2) for storing fuel, and a fuel port (3) attached to a fuel port (3) of the fuel tank (2) and operated by a key (49) inserted into a key cylinder (20) A fuel supply cap (4) that can be opened and closed from the outside, an evaporative fuel reservoir (6) that adsorbs and stores evaporative fuel with an adsorbent, and the fuel tank (2) and the evaporative fuel reservoir (6) communicate with each other. An evaporative fuel processing apparatus for a vehicle, comprising: a charge path (5) for causing the fuel to evaporate; and a purge path (8) for communicating the evaporative fuel reservoir (6) with the intake system (7) of the internal combustion engine;
The fuel supply cap (4) is provided with a communication chamber (25) for communicating the charge passage (5) with the fuel tank (2).
The communication chamber (25) is provided with an open / close valve that opens when the internal pressure of the fuel tank (2) reaches a predetermined pressure and communicates the fuel tank (2) and the evaporated fuel reservoir (6). And
The oil filler cap (4) is provided with a pressure relief mechanism (43, 61, 100, 300) for opening the on-off valve in conjunction with a preliminary operation for opening the oil cap (4). A locking mechanism (47, 131) is provided to advance or retreat according to the internal pressure of the fuel tank (2) and allow or prohibit the opening operation of the fuel cap (4).
The locking mechanism (47, 131) includes a pressure determination mechanism that detects the pressure in the fuel tank (2), and after the pressure release by the pressure release mechanism (43, 61, 100, 300), the fuel tank (2) When the pressure inside becomes a predetermined pressure, the pressure determination mechanism releases the locking state of the locking mechanism (47, 131) and allows the opening operation of the oil supply cap (4). An evaporative fuel processing apparatus for a vehicle, characterized in that the apparatus is configured as follows.   The locking mechanism (47, 131) is displaced in accordance with the rotation of the key cylinder (20) or the rotation of the key cylinder (20) so that the fuel cap (4) is moved to the fuel tank (2) side. The evaporative fuel processing device for a vehicle according to claim 1, wherein the operation of the slider (141) that is locked to the vehicle is allowed or prohibited.   The pressure determination mechanism includes a communication passage that communicates the inside of the fuel tank (2) and the outside of the fuel tank (2), and a pressure sensing member that is operated by a differential pressure inside and outside the fuel tank (2) provided in the communication passage. The locking mechanism operates in conjunction with the pressure sensing member, and is configured to allow or prohibit rotation of the key cylinder (20) or operation of the slider (141). The evaporative fuel processing apparatus for a vehicle according to claim 2, wherein   The pressure sensing member includes a diaphragm or a piston provided in the communication path, a locking pin coupled to the diaphragm or the piston to allow or prohibit the rotation of the key cylinder (20) or the operation of the slider (141), The locking pin is composed of a biasing member that biases the diaphragm or the piston so as to allow the rotation of the key cylinder (20) or the operation of the slider (141), and the internal pressure of the fuel tank (2) When the pressure is higher than a predetermined pressure, the locking pin engages with the key cylinder (20) or the slider (141), and when the pressure in the fuel tank (2) becomes lower than the predetermined pressure, the biasing member The locking pin is configured so as to be detached from the key cylinder (20) or the slider (141). Evaporative fuel processing apparatus of the mounting of the vehicle.   The pressure determination mechanism includes a communication passage that communicates the inside of the fuel tank (2) with the outside of the fuel tank (2) of the communication chamber (25) in which the opening / closing valve is provided, and the opening / closing provided in the communication passage. A flow rate sensing member that senses and operates the flow rate of the evaporated fuel that flows through the on-off valve when the valve is opened, and the locking mechanism (47) operates in conjunction with the flow rate sensing member, and the key cylinder (20). The evaporative fuel processing device for a vehicle according to claim 2, wherein the rotation of the slider or the operation of the slider (141) is allowed or prohibited. The flow rate sensing member includes a diaphragm or a piston provided in the communication path, an operating pin coupled to the diaphragm or the piston, a rotation of the key cylinder (20) attached to the operating pin, or the slider (141). A lock member that permits or prohibits the operation, and a biasing member that biases the diaphragm or the piston so that the lock member allows the rotation of the key cylinder (20) or the operation of the slider (141),
The communication chamber is formed in a small-diameter cylindrical shape, and the diaphragm or piston is displaced toward the communication chamber (25) when the on-off valve is opened and the flow rate of the evaporated fuel is generated in the communication passage. When the lock member is engaged with the key cylinder (20) or the slider (141) and the flow rate of the evaporated fuel is not generated, the bias member causes the lock member to move to the key cylinder (20). 6. The evaporative fuel processing device for a vehicle according to claim 5, wherein the slider (141) is unlocked.   The evaporative fuel processing device for a vehicle according to claim 1, wherein the preliminary operation for opening the fuel supply cap is a push-in operation by inserting a key of the key cylinder.   The evaporative fuel processing for a vehicle according to claim 1, wherein the preliminary operation for opening the refueling cap (4) is a rotation operation by rotation after inserting the key cylinder (20). apparatus.   The vehicle preliminary evaporation according to claim 1, wherein the preliminary preliminary operation for opening the fuel filler cap (4) is an opening / closing operation of a key cover that covers a key insertion hole of the key cylinder (20). Fuel processor.   The locking mechanism (47) is a movable claw provided on the fuel supply cap (4) and engaged with the key cylinder (20) or the slider (141), and the pressure inside the fuel tank (2) is predetermined. When the pressure is higher than the pressure, the movable claw engages with the key cylinder (20) or the slider (141), and when the pressure in the fuel tank (2) becomes lower than a predetermined pressure, The evaporative fuel processing apparatus for a vehicle according to claim 2, wherein the evaporative fuel processing apparatus is configured to be detached from the key cylinder (20) or the slider (141).

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