JPH0924874A - Cap device for vehicular fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the sealing function of a breather hole and a seal member by providing a breather passage of labyrinth structure, formed of chambers, a breather groove, and the like, inside a cap body, and inclining a passage bottom face, provided recessed on the outlet side of the breather passage, downward in a direction of going away from a hinge pin. SOLUTION: In a cap body 41 of a cap device 40 for opening/closing a fuel filler port 39, a hinge part 41a is rotatably fitted to a hinge part 42a of a base seat 42 through a hinge pin 43 so as to be closable. A breather passage 62 of labyrinth structure is formed of the upper part of an inner body 45 internally mounted with a locking device 50 in the cap body 41, a chamber 56 around the locking device 50, a valve chamber 57 for communicating the chamber 56 with the inside of a lock bar cover 46, a chamber 59 near the hinge part 41a, a breather groove 61 at the lower face of a top plate 44, and the like. A passage bottom face 59a inclined downward in a direction of going away from the hinge pin 43 is provided recessed on the outlet side of the breather passage 62, and a breather hole 60 is bored in the passage bottom face 59a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cap device for a vehicle fuel tank.

[0002]

2. Description of the Related Art Vehicles such as motorcycles are equipped with a fuel tank for storing fuel supplied to an engine. Since the fuel in the fuel tank is sucked by the negative pressure of intake air of the engine, if the fuel tank is completely sealed, the inside of the fuel tank will have a negative pressure and smooth fuel supply will be hindered. Therefore, generally, a breather hole is provided in a part of the fuel tank, for example, a cap device that closes the fuel filler port, and outside air is introduced into the fuel tank as fuel is supplied so that the inside of the fuel tank does not become negative pressure. There is.

Conventionally, the breather hole is formed by simply making a hole in the cap device. However, in this cap device, the fuel in the fuel tank sways as the vehicle moves, and the fuel may leak from the breather hole. For this reason, in recent cap devices, a breather passage having a maze structure is provided inside the cap device instead of a breather hole having a simple shape, or a negative pressure valve is provided in the breather passage to prevent fuel leakage. is there.

By the way, when the vehicle suddenly moves, especially when the vehicle is suddenly braked, the fuel in the fuel tank violently shakes, which may temporarily increase the pressure in the fuel tank.

In this case, since the breather passage of the maze structure is always open to the atmosphere, the fuel is jetted from the breather passage due to the sudden increase in the internal pressure of the fuel tank, and the jetted fuel may be applied to the ignition high pressure cord and the engine. is there.

Therefore, in recent years, a breather chamber is provided in the middle of the breather passage, a breather pipe is connected to the outlet of the breather passage, and the open end side of this pipe is arranged away from the engine (for example, it is devised). See Japanese Utility Model Publication No. 59-21995).

FIG. 6 shows a specific example of the cap device described above. As shown in FIG. 6, the cap device 1 includes a pedestal 2 and a cap body 4 that is pivotally attached to the pedestal 2 by a hinge pin 3 so as to be openable and closable. The pedestal 2 is fixed to a pedestal fixing portion 6b provided at the fuel filling port 6 of the fuel tank 5 by a plurality of bolts (not shown).

A lock device 7 is installed in the cap body 4, for example. Further, one lock bar 8 is provided at the bottom of the cap body 4 so as to be able to advance and retract laterally as shown by the arrow in FIG. 6, and the tip claw portion of the lock bar 8 is circumferentially provided at the fuel filler port 6 in the circumferential direction. The cap body 4 is locked by being locked to the formed mouth locking part 6a.
On the other hand, when the lock device 7 is rotated by a key (not shown), the lock bar 8 is housed in the cap body 4 and the locked state of the cap body 4 is released.

On the other hand, a breather passage 9 is formed in the cap body 4. The breather passage 9 includes a first chamber 10 formed around the lock device 7, a valve chamber 11 that connects the first chamber 10 and the fuel tank 5 to each other,
It comprises a second chamber 12 formed in the vicinity of the hinge pin 3, a breather groove 13 that connects the first chamber 10 and the second chamber 12, and the like.

A breather hole 14 is formed in the passage bottom surface 12a of the second chamber 12, and the breather hole 14 is formed.
A tube-shaped sealing member 15 made of an elastic body is provided on the pedestal 2 immediately below. The seal member 15 and the breather hole 14 are arranged vertically and have a common central axis 16,1.
It is configured to have 7. In addition, the seal member 1
5, a lip portion 15a is formed at the open end of the breather hole 14 side, and the lip portion 15a is adapted to elastically contact the second chamber passage bottom surface 12a in a state where the cap body 4 is closed. Further, a breather pipe connecting portion 18 is provided at the other open end of the sealing member 15, and the connecting portion 1
A breather pipe (not shown) is connected to 8.

[0011]

By the way, when the bottom surface 12a of the second chamber passage is elastically contacted with the seal member 15,
The longer the distance χ between the hinge pin 3 and the breather hole 14 in the bottom surface 12a of the second chamber passage, the larger the crushing margin of the lip portion 15a of the seal member 15 due to the principle of leverage, so that the elastic contact force increases and the sealing action improves. .

However, the central axis 1 of the breather hole 14
6 and the central axis 17 of the seal member 15 are arranged vertically, the diameter of the cap body 4 must be reduced if the distance χ between the hinge pin 3 and the breather hole 14 is increased.
As a result, the volumes of the chambers 10 and 12 cannot be increased, and the breather effect is reduced.

Further, in the above-described conventional cap device, when the second chamber passage bottom surface 12a is elastically contacted with the seal member 15, a lateral load may be applied to the seal surface and the lip portion 15a may be deformed. As a result, the position of the seal member 15 is not stable, and there is a possibility that the sealability is deteriorated.

On the other hand, in the cap device 1 having the structure in which the cap body 4 is locked by locking the tip claw portion of one lock bar 8 to the mouth locking portion 6a formed in the fuel filler port 6. When a bolt (not shown) for fixing the pedestal 2 to the fuel tank 5 comes loose due to vibration of the vehicle or is intentionally removed by a third party, as shown in FIG.
Even if the lock bar 8 is in the locked state, there is a possibility that the cap device 1 as a whole may come off by pulling the cap device 1 or the like, and a sudden leak or theft of fuel may occur.

This problem can be dealt with by increasing the number of lock bars 8 to two, increasing the dimension of the cap body 4 in the thickness direction, or preventing the bolt from coming off from the outside. It is not preferable because the number of parts increases, the structure becomes complicated, or the shape of the fuel filler port 6 needs to be changed.

The present invention has been made in consideration of the above circumstances, and an object thereof is to provide a cap device for a fuel tank for a vehicle, which has an improved cap function.

Another object of the present invention is to provide a vehicular fuel tank cap device which can improve the sealing function between the breather hole and the seal member and can form a chamber of a sufficient size in the breather passage. It is in.

Still another object of the present invention is to provide a vehicular fuel tank cap device in which deformation of the lip portion is prevented even when a load is applied to the sealing surface of the sealing member.

Another object of the present invention is to provide a cap device for a fuel tank for a vehicle, in which the cap device as a whole does not come off as long as the lock bar is in a locked state even if the bolt for fixing the pedestal to the fuel tank comes off. It is in.

[0020]

In order to solve the above-mentioned problems, a vehicle fuel tank cap device according to the present invention is provided with a cap device at a fuel filling port of a fuel tank as described in claim 1. When mounted, this cap device has a pedestal fixed to the fuel filler port, and a cap body supported on the pedestal so as to be openable and closable around a hinge pin. In the tank cap device, the cap body is
A breather passage with a labyrinth structure consisting of a chamber and a breather groove is provided inside, and the passage bottom recessed at the exit side of this breather passage is inclined downward in the direction away from the hinge pin so that the passage bottom can communicate with the outside air. The breather hole is formed.

In order to solve the above-mentioned problem, as described in claim 2, a tubular seal member made of an elastic material and having a lip portion is arranged below the breather hole on the bottom surface of the passage. At the same time, a supporting member for preventing the deformation of the seal member is provided on the pedestal near the lip portion so as to abut against the seal member.

Further, in order to solve the above-mentioned problem,
As described in claim 3, a cap device is attached to the fuel filler port of the fuel tank, the cap device is fixed to the fuel filler port, and the cap body is supported on the base so as to be openable and closable around the hinge pin. And a cap device for a vehicle fuel tank having a lock device at a lower portion of the cap body, wherein the lock device has a lock bar provided at a lower portion of the cap body so as to be capable of advancing and retracting sideways. The cap body is configured to be locked by locking the tip claw of the lock bar with the mouth locking part of the fuel filler port, and the locking protrusion is provided on the outer wall of the cap body on the back side of the lock bar. Provided, this locking protrusion,
The lock bar is configured such that when the entire cap device is lifted in a locked state in which the tip claw portion of the lock bar is locked to the mouth locking portion, the lock bar is locked to the mouth locking portion.

[0023]

In the present invention having the above-mentioned structure, a cap device is attached to the fuel filling port of the fuel tank, and the cap device is supported on the pedestal fixed to the fuel filling port and on the pedestal so as to be openable and closable around the hinge pin. The cap body is provided with a lock device at a lower portion of the cap body, and the cap body is provided with a breather passage having a labyrinth structure including a chamber, a breather groove and the like, and an outlet side of the breather passage is provided. Since the bottom surface of the recessed passage is inclined downward in the direction away from the hinge pin, and the breather hole that can communicate with the outside air is formed on the bottom surface of the passage, the distance between the axis of the breather hole and the hinge pin becomes long, and the breather hole is formed. Since the crushing margin of the seal member provided directly below is increased, the elastic contact force is increased and the sealing action between the breather hole and the seal member is increased. It is possible to obtain a chamber with a sufficient size in the breather passage while maintaining a high level, and since a lateral load is not applied to the sealing surface, the lip of the sealing member is not deformed and stable sealing performance is achieved. Can be secured and the cap function is improved.

A tubular seal member made of an elastic material and having a lip portion is disposed below the breather hole on the bottom surface of the passage, and a deformation preventing support for the seal member is provided on the pedestal near the lip portion. Since the supporting member is abutted against the sealing member by projecting the member, the lip portion does not deform even when the bottom surface of the passage is elastically contacted with the sealing member and a load is applied to the sealing surface, resulting in the position of the sealing member. Is stable and the sealing property is improved.

Further, a cap device is attached to the fuel filler port of the fuel tank, and this cap device has a pedestal fixed to the fuel filler port and a cap body supported on the pedestal so as to be openable and closable around a hinge pin. A lock device is provided at a lower portion of the cap body, and the lock device has a lock bar provided at a lower portion of the cap body so as to be capable of advancing and retreating sideways. The cap body is configured to be locked by being locked to the locking portion, and the locking projection is provided on the outer wall of the cap body on the back side of the lock bar, and the locking projection is the tip of the lock bar. The cap device is fixed to the fuel tank because it is configured to engage with the mouth locking part when the entire cap device is lifted with the claw part locked with the mouth locking part. That even the bolt is disengaged, the lock bar is not the entire cap device as long as the locked state is released, the cap functions can be improved.

[0026]

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

FIG. 1 is a left side view showing an example of a motorcycle as a vehicle to which the present invention is applied. In FIG. 1, the motorcycle 21 has a body frame 22, and an engine 23 is mounted on the lower front portion of the body frame 22. A fuel tank 24 is arranged above the engine 23, and an operation seat 25 is installed behind the fuel tank 24.

A head pipe 26 is provided in front of the vehicle body frame 22, and a steering mechanism 27 is provided on the head pipe 26. The steering mechanism 27 is provided with a pair of left and right front forks 29 that rotatably support the front wheels 28, and a handlebar 30, a front fender 31, and the like are attached. The steering mechanism 27 is pivotally attached to the head pipe 26 so as to be rotatable left and right, and the front wheel 28 is steered by the handle bar 30 so as to be rotatable left and right.

On the other hand, a swing arm 33 is pivotally attached to a pivot shaft 32 provided in the lower center of the body frame 22 so as to swing around the pivot shaft 32, and a rear wheel 34 is rotated at a rear end of the swing arm 33. Freely supported.
The lower end of the rear shock absorber 35 is pivotally attached to the rear end of the swing arm 33, and the upper end of the rear shock absorber 35 is pivotally attached to the vehicle body frame 22.

An exhaust pipe 36a and a muffler 36b forming an engine exhaust system 36 are connected to the front side of the engine 23. Further, on the rear side of the engine 23, a carburetor 37a and an air cleaner 37b forming an engine intake system 37 are arranged. Furthermore, engine 2
A radiator 38 that constitutes an engine cooling system is disposed in front of 3.

FIG. 2 is a side view of the fuel tank 24, and a part thereof is shown in a crushed sectional view. As shown in FIG.
A fuel filler port 39 is formed in the upper portion of the fuel tank 24, and the fuel filler port 39 is closed by a cap device 40.

FIG. 3 is a vertical sectional view of the cap device 40, and FIG. 4 is a sectional view taken along line IV-IV of FIG. As shown in FIGS. 3 and 4, the cap device 40
Is composed of a cap body 41 and an annular pedestal 42 arranged on the outer peripheral portion of the cap body 41.
The cap body 41 is configured such that its hinge portion 41a is pivotally attached to the hinge portion 42a of the pedestal 42 via a hinge pin 43 so as to be openable and closable, while the pedestal 42 is provided with a plurality of bolts (not shown) for fueling the fuel tank 24. It is fixed to a pedestal fixing portion 39c formed in the mouth 39.

The cap body 41 mainly includes the top plate 44, the inner body 45, and the lock bar cover 4.
And 6. The inner body 45 is housed in the lock bar cover 46, and is fixed to the lower surface of the top plate 44 with a screw 48 or the like with the first packing 47 interposed therebetween. An annular second packing 49 is arranged on the outer peripheral surface of the inner body 45. This second packing 49
Is always pressed against the upper edge portion 39a of the fuel filler port 39 with the cap body 41 closed, and makes the fuel filler port 39 liquid-tight.

A lock device 5 is provided below the inner body 45.
0 is installed. In this locking device 50, one lock bar 51 is provided between the bottom of the inner body 45 and the bottom of the lock bar cover 46 so as to be able to move forward and backward, as shown by the arrow in FIG. Be urged by. It should be noted that the tip claw portion 51 a of the lock bar 51 is formed by the hinge portions 41 a, 42 of the cap body 41 and the pedestal 42.
It is arranged so as to project at a position facing a.

The tip claw portion 51a of the lock bar 51
Is formed on the fuel filler port 39 in the circumferential direction, and the mouth locking portion 39 is formed.
The cap body 41 is locked by being locked to b. The mouth locking portion 39b does not necessarily have to be formed over the entire circumference in the circumferential direction, and may be provided at two locations in the diametrical direction.

On the other hand, the lock device 5 is operated by a key (not shown).
If 0 is turned, the lock bar 51 is housed in the lock bar cover 46, and the locked state of the cap body 41 is released. A key cap 53 is provided above the key insertion portion on the upper surface of the lock device 50, and the key cap 53 is pivotally attached to the top plate 44 so as to be openable and closable.

By the way, a locking convex portion 54 is provided on the outer wall 46a of the lock bar cover 46 on the back side of the lock bar 51. As shown in FIG. 5, the locking projection 54 is provided with a fuel filler port when the entire cap device 40 is lifted in a state where the tip claw portion 51a of the lock bar 51 projects and is locked to the mouth locking portion 39b. It is configured to be locked to the mouth locking portion 39b formed in 39.

On the other hand, a gap 55 is formed between the lock bar 51 and the lock bar cover 46, and the inside of the lock bar cover 46 and the inside of the fuel tank 24 are communicated with each other. A first chamber 56 is formed in the upper portion of the inner body 45 and around the lock device 50, and a valve chamber 57 that connects the first chamber 56 and the lock bar cover 46 is formed below the first chamber 56. To be done. A check ball 58 that regulates the flow of fuel into the first chamber 56 is enclosed in the valve chamber 57. Further, a second chamber 59 is formed in the upper portion of the inner body 45 and near the hinge portion 41a of the cap body 41.

On the other hand, an arc-shaped breather groove 61 is formed on the lower surface of the top plate 44. One end of the breather groove 61 has a first communication port 47a formed in the first packing 47.
Through the first chamber 56. The other end of the breather groove 61 communicates with the second chamber 59 via the second communication port 47b formed in the first packing 47. The first and second chambers 56 and 59, the valve chamber 57, the breather groove 61, the first communication port 47a, the second communication port 47b, and the like form a breather passage 62 having a maze structure.

At the exit side of the breather passage 62, the passage bottom surface 5
9a is provided as a recess, and the breather hole 6 is provided on the bottom surface 59a of the passage.
0 is drilled. The passage bottom surface 59a has an inclined surface that inclines downward in the direction away from the hinge pin 43, and a breather hole 60 that communicates with the atmosphere is formed on this inclined surface.

Below the hinge portion 42a of the pedestal 42,
A tubular seal member 63 made of an elastic body is provided just below the breather hole 60 on the passage bottom surface 59a. The seal member 63 is obliquely arranged so that its central axis 64 has a common axis with the central axis 65 of the breather hole 60.
Further, a lip portion 63a is formed at the opening end of the seal member 63 on the breather hole 60 side, and the lip portion 63a elastically contacts the passage bottom surface 59a in a state where the cap body 41 is closed. Further, a breather pipe 67 connecting portion 66 is provided at the other open end of the seal member 63, and the breather pipe 67 is connected to the connecting portion 66 as shown in FIG. Although not shown in detail, the open end side of the breather pipe 67 is arranged away from the engine 23 as usual.

When the cap body 41 is closed and the passage bottom surface 59a elastically contacts the lip portion 63a of the seal member 63, the seal member may be collapsed or deformed. A support member 70 for preventing deformation of the seal member 62 is provided in a protruding manner, and the support member 70 is brought into contact with the seal member 63.

Next, the operation of this embodiment will be described.

When the motorcycle 21 abruptly moves, for example, suddenly brakes and the fuel in the fuel tank 24 sways to increase the pressure in the fuel tank 24, the breather gas containing the fuel causes the breather gas to contain the lock bar 51 and the lock bar 51. After entering the breather passage 62 through the gap 55 between the cover 46 and the fuel, the fuel is separated and removed by the expansion liquefaction action due to the pressure reduction in the breather passage 62. Then, as shown by the arrow in FIG. , And is released into the atmosphere at a position away from the engine 23 through the breather pipe 67.

On the other hand, when the fuel in the fuel tank 24 is sucked by the negative pressure of the intake air of the engine 23, the outside air is introduced into the fuel tank 24 by following the above-mentioned route of the breather passage 62 in the reverse direction. The negative pressure does not result in a smooth fuel supply.

By the way, the bottom surface 59a of the passage is covered with the seal member 6.
3 is elastically contacted with the hinge pin 43 and the passage bottom surface 59a.
The longer the distance α from the breather hole 60, the larger the crushing margin of the lip portion 63a of the seal member 63 due to the principle of leverage, so that the elastic contact force increases and the sealing action improves.

By tilting the passage bottom surface 59a downward in the direction in which the breather hole 60 moves away from the hinge pin 43, the distance α between the center axis 64 of the breather hole 60 and the hinge pin 43 is the same as in the conventional case. Hinge pin 43 and breather hole 60 when vertically arranged
And the distance χ (see FIG. 6).

Here, if the elastic contact force between the passage bottom surface 59a and the seal member 63 is equal to the conventional one, the horizontal distance β between the breather hole 60 and the hinge pin 43 may be shorter than the conventional one, and as a result, the cap body It is not necessary to reduce the diameter of 41, and the volumes of the chambers 56 and 59 can be increased. Since the volumes of the chambers 56 and 59 can be made large, the breather effect can be maintained high, and it is possible to sufficiently cope with a sudden change in the internal pressure in the fuel tank 24.

When the passage bottom surface 59a is elastically contacted with the seal member 63, only the axial force of the central shaft 64 of the seal member 63 acts on the lip portion 63a at the tip of the seal member 63, so that the lip portion 63a. Of the base 4 near the lip portion 63a due to deformation of the
Since the deformation preventing support member 70 of the seal member 62 is provided on the second member 2, even if a load is applied to the sealing surface of the seal member 63, the seal member 63 will not be deformed such as falling down and stable sealing performance. Can be obtained.

On the other hand, the locking projection 54 is provided on the outer wall 46a of the lock bar cover 46 on the back side of the tip claw portion 51a of the lock bar 51.
As shown in FIG. 5, the tip end claw portion 51a of the lock bar 51 projects from the locking projection 54 so that the mouth locking portion 39b.
The pedestal 42 is fixed to the fuel tank 24 by being configured to engage with the mouth engaging portion 39b formed in the fuel filler port 39 when the entire cap device 40 is lifted in the state of being engaged with the fuel tank 24. Even if the bolt does not come loose due to the vibration of the vehicle or is intentionally removed by a third party, the cap device 40 as a whole does not come off as long as the lock bar 51 is in the locked state, and a sudden fuel leak occurs. No theft or theft will occur.

The lock bar cover 46 outer wall 46a
Providing the locking convex portion 54 to the lock bar 51 is greater than the number of the lock bar 51 to two, the size of the cap body 41 in the thickness direction is increased, or the bolt is prevented from coming off from the outside. The number of parts is small, and
Since the structure is simple, it does not cost much.

[0052]

As described above, according to the vehicular fuel tank cap device of the present invention, the cap device is attached to the fuel filler port of the fuel tank, and the cap device is fixed to the fuel filler port. It has a pedestal and a cap body supported on the pedestal so as to be openable and closable around a hinge pin,
In a cap device for a vehicle fuel tank having a lock device at a lower portion of the cap body, the cap body is provided with a breather passage having a labyrinth structure including a chamber and a breather groove, and an outlet side of the breather passage. Since the bottom surface of the recessed passage is inclined downward in the direction away from the hinge pin, and the breather hole that can communicate with the outside air is formed on the bottom surface of the passage, the distance between the axis of the breather hole and the hinge pin becomes long, and the breather hole is formed. Since the crushing margin of the seal member provided directly below becomes large, the elastic contact force increases, and while maintaining a high sealing action between the breather hole and the seal member, it is possible to obtain a chamber of a sufficient size in the breather passage and Since the lateral load is not applied to the surface, the lip of the seal member does not deform and is stable. Sealability can be secured, the cap functions can be improved.

A tubular seal member made of an elastic material and having a lip portion is disposed below the breather hole on the bottom surface of the passage, and a deformation preventing support for the seal member is provided on the pedestal near the lip portion. Since the supporting member is abutted against the sealing member by projecting the member, the lip portion does not deform even when the bottom surface of the passage is elastically contacted with the sealing member and a load is applied to the sealing surface, resulting in the position of the sealing member. Is stable and the sealing property is improved.

Further, a cap device is attached to the fuel filling port of the fuel tank, and this cap device has a pedestal fixed to the fuel filling port and a cap body supported on the pedestal so as to be openable and closable around a hinge pin. In the cap device for a vehicle fuel tank having a lock device at a lower portion of the cap body, the lock device has a lock bar provided at a lower portion of the cap body so as to be able to move forward and backward.
The cap body is configured to be locked by locking the tip claw portion of the lock bar with the mouth locking portion of the fuel filler port, and the locking projection is formed on the outer wall of the cap body on the back side of the lock bar. The locking projection is configured to lock to the mouth locking portion when the entire cap device is lifted in a locked state in which the tip claw portion of the lock bar locks to the mouth locking portion. Therefore, even if the bolt for fixing the cap device to the fuel tank comes off, the cap device as a whole does not come off as long as the lock bar is in the locked state, and the cap function is improved.

[Brief description of drawings]

FIG. 1 is a left side view of a motorcycle as a vehicle showing an embodiment of a vehicle fuel tank cap device according to the invention.

FIG. 2 is a side view of a fuel tank.

FIG. 3 is a vertical sectional view of a cap device.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a side view of the cap device.

FIG. 6 is a vertical cross-sectional view of a conventional cap device.

FIG. 7 is a side view of a conventional cap device.

[Explanation of symbols]

 21 Motorcycle 24 Fuel Tank 39 Fuel Filling Port 39b Mouth Locking Port Formed at Fuel Filling Port 40 Cap Device 41 Cap Body 42 Pedestal 43 Hinge Pin 44 Top Plate (Cap Body) 45 Inner Body (Cap Body) 46 Lock Bar Cover (cap body) 46a Outer wall of lock bar cover 47 First packing 50 Locking device 51 Lock bar 51a Lock bar tip claw portion 54 Locking convex portion 56 First chamber 59 Second chamber 59a Breather passage bottom surface 60 Breather hole 61 breather groove 62 breather passage 63 seal member 63a seal member lip 64 central axis of breather hole 70 support member for preventing deformation of seal member α distance between central axis of breather hole and hinge pin β central axis of breather hole and hinge pin Horizontal distance of

Front page continuation (72) Inventor Shunsuke Omura 1126 Nakajo, Hamakita City, Shizuoka Prefecture Asahi Denso Co., Ltd.

Claims (3)

[Claims] 1. A cap device is attached to a fuel filler port of a fuel tank, and the cap device has a pedestal fixed to the fuel filler port, and a cap body rotatably supported on the pedestal around a hinge pin. In a cap device for a vehicle fuel tank having a lock device at a lower portion of the cap body, the cap body 41 includes therein a breather passage 62 having a labyrinth structure including chambers 56 and 69, a breather groove 61, and the like. The bottom surface 59a of the breather passage 62, which is recessed on the outlet side, is connected to the hinge pin 43.
Slope down in the direction away from the
A cap device for a fuel tank for a vehicle, characterized in that a breather hole 60 capable of communicating with the outside air is formed in the air. 2. A tubular seal member 63 made of an elastic material and having a lip portion 63a is disposed below the breather hole 60 on the bottom surface 59a of the passage, and the seal is provided on the pedestal 42 near the lip portion 63a. The vehicle fuel tank cap device according to claim 1, wherein a support member 70 for preventing deformation of the member 62 is provided in a protruding manner, and the support member 70 is brought into contact with the seal member 63. 3. A cap device is attached to a fuel filler port of a fuel tank, and the cap device has a pedestal fixed to the fuel filler port, and a cap body rotatably supported on the pedestal around a hinge pin. In a cap device for a vehicle fuel tank having a lock device at a lower part of the cap body, the lock device has a lock bar 51 provided at a lower part of the cap body 41 so as to be able to move forward and backward. The cap body 41 is configured to be in a locked state by locking the tip end claw portion 51 a of the fuel cell 51 to the mouth locking portion 39 b of the fuel filler port 39.
Outer wall 46 of the cap body 41 on the back side of the lock bar 51
A locking projection 54 is provided on a, and the locking projection 54 is provided when the cap device 40 is entirely lifted in a locked state in which the tip claw portion 51a of the lock bar 51 is locked to the opening locking portion 39b. A cap device for a vehicle fuel tank, characterized in that the cap device is configured to be locked to the part locking part 39b.