JP3339236B2 - Canister - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canister for treating evaporated fuel generated in a fuel tank so as not to leak into the atmosphere.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open No.
A canister disclosed in Japanese Patent No. 47357 is known. In the canister of one embodiment disclosed in the publication, one end opening of a vapor passage is connected to a fuel tank,
The other end opening is connected to the canister via a tank internal pressure control valve composed of a check ball valve. When the fuel evaporates in the fuel tank and the internal pressure of the tank increases to a predetermined value or more, the tank internal pressure control valve opens and the fuel vapor in the fuel tank is introduced into the canister through the vapor passage.

Further, the canister is further provided with two openings, and both openings are closed by check ball valves. One of the check ball valves is an atmospheric intake valve, which opens when purging the fuel vapor adsorbed in the canister into the engine intake system, and introduces outside air into the canister. ing. On the other hand, the other check ball type valve is an atmospheric release valve, which opens when the pressure in the canister increases to a predetermined value or more, and the fuel component is collected in the canister. Fuel (air) is discharged into the atmosphere. In the canister of the prior art, the tank internal pressure control valve, the atmosphere suction valve, and the atmosphere opening valve are each adjusted to adjust the valve opening pressure so that the fuel component of the evaporated fuel is efficiently collected. Has become.

Meanwhile, in recent years, leakage of fuel vapor has been considered to be a cause of air pollution, and a technique for preventing this is strongly desired. In particular, when fuel is supplied into the fuel tank, a large amount of evaporated fuel leaks from the fuel supply port, which is a problem. Therefore, there is a technique for adding a function of processing the evaporated fuel generated during refueling to the canister described above. For example, in a canister described in the specification and drawings of US Pat. No. 4,714,172, a breather passage is provided in addition to the vapor passage. The fuel vapor generated in the fuel tank at the time of refueling is introduced into the canister through the breather passage, and the fuel component is collected.

[0005]

At the time of refueling, the evaporated fuel introduced into the canister is discharged to the outside from the atmosphere opening valve after its fuel component is collected. Here, since the amount of evaporated fuel introduced from the fuel tank to the canister at the time of refueling is extremely large, there is a possibility that a large ventilation resistance may be generated when the evaporated fuel passes through the check ball type air release valve. If the flow of vapor from the fuel tank to the canister is obstructed by the ventilation resistance of the air release valve, the internal pressure in the fuel tank increases, so that fuel cannot be smoothly injected into the tank. That is, the lubricating property is reduced.

[0006] The adsorbent filled in the canister must always be maintained in a state where the adsorbing capacity has a margin so that a large amount of fuel vapor can be processed. Therefore, it is necessary to introduce a large amount of outside air from the air intake valve and to release a large amount of the evaporated fuel collected in the canister by the outside air, thereby increasing the purge amount of the evaporated fuel supplied to the engine intake path. is there. However, it is difficult to introduce a large amount of outside air with a check ball valve used as an atmospheric suction valve in a conventional canister.

For the above reasons, it is conceivable to employ a diaphragm type valve as the atmospheric suction valve and the atmospheric release valve instead of the check ball type valve. This is because a diaphragm valve can pass a large amount of fuel vapor and outside air as compared with a check ball valve.

However, the following problems occur in a canister in which a diaphragm type valve is employed as an atmosphere intake valve and an atmosphere release valve. That is, since the diaphragm type valve is larger than the check ball type valve, the size of the canister in which these are disposed is also increased.
Increasing the size of the canister poses a problem, for example, when mounting the canister in a limited space in an automobile.

FIGS. 7 and 8 (a) and 8 (b) show the canister 9
FIG. 1 shows an example in which an atmosphere intake valve 95 and an atmosphere release valve 96 of a diaphragm type valve are provided. The interior of the canister 91 shown in FIGS. 7, 8A and 8B is partitioned by a partition plate 92 into two adsorbent chambers 93a and 93b. On one side surface of the canister 91, a tank internal pressure control valve 94 is disposed on one adsorbent chamber 93a side, and an air suction valve 95 and an air release valve 96 are disposed on the other adsorbent chamber 93b side. Has been established.

FIG. 7 shows an up-down flow type canister 91 in which vaporized fuel flows vertically when mounted on a vehicle or the like. As shown in FIG.
1. Atmospheric intake valve 95 and atmospheric release valve 96 juxtaposed at the top
Protrudes beyond the entire width L of the main body of the canister 91, thereby increasing the entire width of the canister 91.

FIGS. 8 (a) and 8 (b) show a side flow type canister 91 in which evaporated fuel flows in a horizontal direction. In the side flow type canister 91, the overall height can be reduced, so that the space required for mounting on a vehicle or the like can be reduced. However, in the canister 91 using the diaphragm type valve as the atmosphere intake valve 95 and the atmosphere release valve 96, as shown in the figure, both valves 95 and 96 do not fit within the height H of the canister 91 main body, and the height of the canister 91 is reduced. It becomes big and becomes a problem.

Here, an air suction valve 95 is provided to the canister 91.
And without providing the atmosphere release valve 96, for example, both valves 9
It is conceivable to connect 5, 96 to the canister 91 via a hose or the like. FIG. 9 shows a canister 91 and two valves 95,
An example in which 96 is connected by a hose 97 is shown. By forming the canister 91 and the two valves 95 and 96 separately, it is possible to avoid an increase in the total width L and the total height H of the canister 91 as described above.

However, in the case of such a configuration, parts such as a hose 97 for connecting the canister 91 and the two valves 95 and 96 or a clamp 98 are separately required, so that the cost of the canister 91 is increased. become. Further, a phenomenon in which the fuel vapor passes through the hose 97 to the outside, that is, so-called permeation may occur. In addition, when the canister 91 is mounted on a vehicle, a reduction in work efficiency due to an increase in the number of mounting components poses a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a canister for collecting evaporated fuel generated in a fuel tank of an internal combustion engine, a diaphragm is provided at the atmosphere intake valve and the atmosphere release valve. The purpose of the present invention is to enable the processing of a large amount of fuel vapor and to reduce the size of the fuel by adopting a type valve.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 provides a casing having an adsorbent chamber for accommodating an adsorbent for collecting fuel vapor, and the casing has A first valve that is provided and opens when the internal pressure of the adsorbent chamber becomes equal to or higher than a first predetermined value, and discharges air containing no fuel component in the adsorbent chamber to the atmosphere, A second valve provided in the casing and opening when the internal pressure of the adsorbent chamber becomes equal to or less than a second predetermined value and introducing outside air into the adsorbent chamber; the housing is provided, along with an opening communicating between the inside of the casing within the housing formed in the casing, the first valve and the vertical direction within the housing of the second valve by a diaphragm valve
The valve with the highest valve opening pressure of both valves is lead
While the valve is located directly below, the valve opening pressure is low.
The valve is placed on the upper side in the vertical direction.
The gist of the invention is that the valve is biased to the valve seat .

According to a second aspect of the present invention, in the canister according to the first aspect, the valve having a small valve opening pressure is the first valve.
The gist is that it is a valve . Claim 3
According to the invention described in the first aspect, in the canister according to the first aspect,
The housing is separate from the casing and detachable.
The gist is that what has been done. Claim 4
The invention according to claim 3, wherein in the canister according to claim 3, the canister
Provided on the side wall of the housing, the space inside the housing
And a pipe provided on the side wall of the casing.
And a fitting hole for inserting the pipe.
A plurality of fitting projections are formed on the outer peripheral surface of the
Forming a notch having a shape in which the fitting protrusion can be inserted;
And the inner peripheral surface of the fitting hole is fitted with the fitting protrusion.
The gist is that a groove that fits is formed.
You. According to a fifth aspect of the present invention, there is provided a canister according to the third aspect.
In the star, provided on the side wall of the casing,
A pipe communicating with a space inside the housing, and the housing
And a fitting hole for inserting the pipe,
And a plurality of fitting projections formed on an outer peripheral surface of the pipe.
The fitting hole has a shape into which the fitting protrusion can be inserted.
And a notch formed on the inner peripheral surface of the insertion hole.
Indicates that a groove for fitting with the fitting protrusion is formed.
To the effect. The invention according to claim 6 is the invention according to claim
1. The canister described in 1
It must be a side-flow type in which the generated fuel flows in the horizontal direction.
And its gist.

According to a seventh aspect of the present invention, in the canister according to the sixth aspect , the diaphragms provided in the first valve and the second valve are opposed to each other, and the center position of the diaphragm is set to a predetermined distance. And place it, and
The gist is that the space between both diaphragms is a pressure chamber common to both valves.

[0018]

According to the first aspect of the present invention, when the internal pressure of the adsorbent chamber becomes equal to or higher than the first predetermined value, the first valve opens to contain the fuel component in the adsorbent chamber. No air is exhausted into the atmosphere. Further, when the internal pressure of the adsorbent chamber becomes equal to or lower than a second predetermined value, the second valve opens, and outside air is introduced into the adsorbent chamber. Since both the first valve and the second valve are diaphragm valves, the amount of air discharged into the atmosphere or the amount of outside air introduced into the adsorbent chamber by both valves is large. Also, since both valves and the canister are connected at one opening, the number of parts is reduced and the mounting space for both valves is reduced as compared to a case where both valves are separately mounted on the canister.

Further, a valve arranged vertically above within the housing is prevented the influence of valve-opening by gravity. According to the invention described in claim 2, the first valve is the
It is easier to open than the second valve. Therefore, the canis
Vapor where fuel components are collected and cleaned
(Air) can be quickly discharged to the outside, and the ORV
The amount of vapor processing during R processing can be increased
You. According to the third aspect of the invention, the member of the canister is provided.
Improves tenability and enables common use of parts
Thus, the manufacturing cost can be reduced. Claim 4
According to the invention as set forth in claim 5, the canister according to claim 3 is provided.
In addition to the function of the star, the housing is attached to the casing
Installation process is easy, and the installation process is shortened.
Is done. According to the invention described in claim 6, the canister
When mounted on vehicles, etc.
Space can be reduced.

According to the invention of claim 7 , according to claim 6,
In addition to the operation of the canister, the diaphragms provided in the first valve and the second valve are arranged with their center positions separated by a predetermined distance. Dimensions are reduced.
Since the space between the housings is a common pressure chamber for both valves, the size of the housing is reduced.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a canister of an automobile will be described below with reference to FIGS. In the following description, a process of introducing evaporated fuel generated in a fuel tank at the time of refueling to a canister and collecting a fuel component is referred to as “ORVR process” (ORVR; Onboard Recycle).
Fueling Vapor Recovery) and normal vapor processing other than during refueling are called "steady vapor processing".

FIG. 1 is an explanatory diagram showing the entire system when the canister 1 in this embodiment is mounted on a vehicle. For convenience of explanation, in FIG. 1, the canister 1 is an up-down flow type in which the vapor flows vertically inside the canister 1, but the actual structure is a side flow type as shown in FIG. The tank internal pressure control valve 4 and the atmosphere side control valve 30 are provided on one side thereof.

As shown in FIG. 1, one end of a vapor passage 3 for introducing evaporative fuel (hereinafter referred to as vapor) generated inside the fuel tank 2 into the canister 1 is connected to the fuel tank 2 by opening. The other end of the vapor passage 3 is connected to the canister 1 via a tank internal pressure control valve 4 provided in the canister 1. The tank internal pressure control valve 4 is opened when the internal pressure of the fuel tank 2 increases to a predetermined value or more, and the vapor of the fuel tank 2 is introduced to the canister 1 side.
Note that a diaphragm valve is used as the tank internal pressure control valve 4.

A breather pipe 5 is provided above the fuel tank 2. A differential pressure valve 6 is provided so as to cover the upper part of the breather pipe 5. The differential pressure valve 6 is opened at the time of refueling. The differential pressure valve 6 is also a diaphragm type valve like the tank internal pressure control valve 4, and the inside thereof is divided into two pressure chambers by a diaphragm valve 7. One of the two pressure chambers is a first pressure chamber 8, and is communicated with the inside of a fuel injection pipe 9 provided in the fuel tank 2 by a pressure passage 10. The other pressure chamber is a second pressure chamber 11, which is in communication with the inside of the canister 1 by a breather passage 12. A coil spring 13 is disposed in the first pressure chamber 8, and the diaphragm valve 7 is urged downward by the elastic force of the coil spring 13 to close the upper end opening of the breather pipe 5.

At the time of refueling, the vapor of the fuel tank 2 is introduced into the canister 1 through the breather passage 12. Here, the amount of vapor passing through the breather passage 12 during the ORVR process is larger than the amount of vapor passing through the vapor passage 3 during the steady-state vapor process, and the flow rate thereof is about 50 times. Therefore, the cross-sectional area of the breather passage 12 is about ten times larger than that of the vapor passage 3.

The interior of the canister 1 is connected to a surge tank 15 which is a part of the engine intake system by a purge passage 14. A purge amount control valve 16 is provided in the middle of the purge passage 14. This purge amount control valve 16
The ECU 17 controls the amount of purge supplied into the surge tank 15, and is controlled by the ECU 17 (Electronic Controller).
ol Unit).

FIG. 2 shows the canister 1 in this embodiment. When the canister 1 in this embodiment is mounted on a vehicle, the canister 1 is of a side flow type in which the vapor moves horizontally inside the canister 1. The interior of the casing 1a constituting the canister 1 is divided into two adsorbent chambers by a partition plate 18, one adsorbent chamber is a first adsorbent chamber 19, and the other adsorbent chamber is a second adsorbent chamber 20. Have been. An air layer 21 is formed on one side (left side in the figure) of each of the adsorbent chambers 19 and 20, and an adsorbent layer 22 is provided adjacent to the air layer 21. Filters 23 and 24 are provided on both sides of the adsorbent layer 22, respectively, and the space of the adsorbent layer 22 sandwiched between the filters 23 and 24 is filled with a granular activated carbon adsorbent 25 for adsorbing vapor. The filter 2 provided on the right side of the adsorbent layer 22
A diffusion chamber 26 is formed adjacent to the first and second adsorbent chambers 1.
9 and 20 are communicated by the diffusion chamber 26. still,
The activated carbon adsorbent 25 constitutes the adsorbent of the present invention.

As shown in FIGS. 2 and 3, the tank internal pressure control valve 4 is provided on one side of the casing 1a corresponding to the first adsorbent chamber 19, and the breather passage 12 and the purge passage 14 are provided. Are open and connected. Further, one end of the pressure passage 27 is opened and connected to a position adjacent to the purge passage 14, and is connected to the pressure passage 2.
The other end of 7 is connected to a back pressure chamber 72 on the side of the atmospheric suction valve 29 described later. At one side of the casing 1a corresponding to the second adsorbent chamber 20, there is provided an atmosphere side control valve 30 in which an atmosphere release valve 28 and an atmosphere suction valve 29 are integrally formed. The atmosphere opening valve 28 constitutes a first valve of the present invention, and the atmosphere suction valve 29 constitutes a second valve.

FIG. 4 is a sectional view taken along the line AA in FIG.
FIG. 3 is a sectional view of a tank internal pressure control valve 4. The tank internal pressure control valve 4 has a structure detachable from the casing 1a, and as shown in FIG.
a. Main body 4 of tank internal pressure control valve 4
5 is provided with a pressure pipe 31 for introducing vapor into the canister 1. On the other hand, a thick portion 32 is formed on the side wall of the casing 1a, and a fitting hole 33 is provided in the thick portion 32. The pressure pipe 31 is inserted into the fitting hole 33 of the casing 1a. Also, the first adsorbent chamber 20 of the fitting hole 33 is formed.
An inner flange 34 is formed on the inner peripheral wall located on the side. The distal end of the pressure pipe 31 inserted into the fitting hole 33 is in contact with the side wall of the inner flange 34.
An opening formed by the inner peripheral surface of the inner flange 34 serves as a vapor introduction port 35 that communicates the inside of the canister 1 with the inside of the tank internal pressure control valve 4.

A pair of fitting projections 36a and 36b are provided at positions 180 ° opposite to each other on the outer circumference of the pressure pipe 31.
Is provided. On the inner peripheral wall of the insertion hole 33, grooves 37a, 3b are provided at positions corresponding to the both engagement protrusions 36a, 36b.
7b are formed, and the two fitting protrusions 36a, 36b are formed.
Are fitted in the grooves 37a and 37b. Furthermore, locking claws 38a, 38b, 39a, 39b are formed in the tips of the fitting projections 36a, 36b and in the grooves 37a, 37b at positions corresponding to the tips, respectively. , 38b, 39a, 39b regulate the relative movement of the pressure pipe 31 in the axial direction and around the axis between the two 36a, 37a, 36b, 37b. An O-ring 40 is tightly fitted to the pressure pipe 31 as a sealing material, and the O-ring 40 is closely held between the outer peripheral wall of the pressure pipe 31 and the inner peripheral wall of the fitting hole 33.

FIG. 6 is an explanatory view showing the structure of the connection portion C1 and a method of attaching the tank internal pressure control valve 4 to the casing 1a. As shown in the drawing, a fitting hole 33 in the front end surface of the thick portion 32 (the left end surface of the thick portion 32 in FIG. 4).
A pair of notches 85a and 85b are formed at positions 180 degrees opposite to each other on the periphery of. Double notch 85
Reference numerals a and 85b each have a shape in which both fitting projections 36a and 36b provided on the pressure pipe 31 can be inserted.

In order to attach the tank internal pressure control valve 4 to the casing 1a, first, the pressure pipe 31 is connected to the fitting hole 33.
Insert At this time, as shown by a solid arrow in FIG. 6, the tank internal pressure control valve 4 is rotated by about 90 degrees around the pressure pipe 31, and the fitting projections 36a, 36b formed on the pressure pipe 31 are cut off. Chip 85a,
85b. And the pressure pipe 31
Is inserted into the fitting hole 33, and the tip of the pressure pipe 31 is brought into contact with the side wall of the inner flange 34. From this state, while the fitting projections 36a and 36b are fitted with the grooves 37a and 37b shown in FIG.
Is rotated relative to the casing 1a in a direction opposite to the rotation direction to complete the mounting. Through the above steps, the tank internal pressure control valve 4 is connected to the casing 1a by the connecting portion C1
Is attached detachably. At this time, since the sealing property of the connection portion C1 is enhanced by the O-ring 40 described above, the vapor in the canister 1 does not leak outside from the connection portion C1.

Next, the structure inside the tank internal pressure control valve 4 will be described. As shown in FIG.
The inside of 1 is communicated with an introduction passage 41 formed inside a main body 45 of the tank internal pressure control valve 4. Therefore, when the tank internal pressure control valve 4 is attached to the casing 1a, the inside of the introduction path 41 and the inside of the first adsorbent chamber 19 are communicated via the pressure pipe 31 and the vapor introduction port 35. A pressure pipe 42 is provided in the middle of the introduction path 41 so as to be opened, and a check ball type vapor relief valve 43 is formed at the tip of the introduction path 41. The vapor relief valve 43 includes a check ball 43a and a spring 43b for urging the check ball 43a downward.

A flexible disk-shaped diaphragm 44 is provided inside the tank internal pressure control valve 4, and its peripheral portion is sandwiched between a main body 45 of the tank internal pressure control valve 4 and a lid 46. The inside of the tank internal pressure control valve 4 is divided into two pressure chambers by the diaphragm 44,
An atmospheric pressure chamber 47 is formed by the space formed by the diaphragm 44 and the lid 46 so that the diaphragm 44 and the main body 4 are separated from each other.
The positive pressure chambers 48 are respectively formed by the spaces formed by 5. An air introduction port 49 is formed on the side of the lid 46 corresponding to the atmospheric pressure chamber 47 side, and the internal pressure of the atmospheric pressure chamber 47 is always atmospheric pressure. On the other hand, an evaporative pipe 50 is formed below the main body 45 corresponding to the positive pressure chamber 48, and the evaporative pipe 50 is connected to the fuel tank 2 through the vapor passage 3. Therefore, the inside of the positive pressure chamber 48 communicates with the inside of the fuel tank 2.

A valve body 51 is attached to the lower center of the diaphragm 44, and the valve body 51 closes the distal end opening 42a of the pressure pipe 42. A spring receiver 52 is attached to the upper center of the diaphragm 44, and an annular positioning projection 53 is formed on the lid 46 at a position facing the spring receiver 52. The coil spring 54 is sandwiched between the spring receiver 52 and the positioning protrusion 53, and is disposed in a state where the coil spring 54 is positioned by the both 52 and 53. The valve element 51 is urged downward via the spring receiver 52 by the elastic force of the coil spring 54, and is pressed against the distal end opening 42 a of the pressure pipe 42.
Therefore, the fuel tank 2 introduced into the positive pressure chamber 48
When the pressure difference between the internal pressure and the atmospheric pressure is equal to or less than a predetermined value, the tank internal pressure control valve 4 is in a closed state.
When the pressure in the fuel tank 2 becomes a negative pressure equal to or lower than a predetermined value, the check ball 43a of the vapor relief valve 43
Moves upward against the urging force of the spring 43b to introduce air in the canister 1 into the fuel tank 2.

As shown in FIGS. 2 and 3, the second adsorbent chamber 2
An atmosphere side control valve 30 is provided on one side of the casing 1a corresponding to the 0 side. FIG. 5 is a cross-sectional view taken along the line BB in FIG. The atmosphere side control valve 30 has a structure detachable from the casing 1a, and is attached to the casing 1a at a connection portion C2 as shown in FIG. Atmospheric control valve 30
The main body 67 is provided with a pressure pipe 55, through which the outside air is introduced into the canister 1, or the vapor (air) in which the fuel component is collected in the canister 1 is discharged to the outside. The structure of the connection portion C2 is the same as the connection portion C1 of the tank internal pressure control valve 4 described above.
It is the same as the structure of FIG. Therefore, they will be described briefly.

A thick portion 56 is formed on one side of the casing 1a to which the atmosphere-side control valve 30 is attached, and a fitting hole 57 is provided. The second of the same insertion hole 57
An inner flange 58 is formed at a position near the adsorbent chamber 20, and an opening formed by the inner peripheral surface of the inner flange 58 is an atmosphere port 59. In the present invention, the atmosphere port 59 is provided inside the housing D and the casing 1a to be described later.
An opening communicating with the inside is formed. The fitting protrusions 60a and 60b formed on the outer periphery of the pressure pipe 55 are fitted with the grooves 61a and 61b of the fitting hole 57. Also,
The fitting protrusions 60a, 60b and the groove portions 61a, 61b are formed with locking claws 62a, 62b, 63a, 6 formed on both.
The relative movement is regulated by 3b. Pressure pipe 55
The O-ring 64 is tightly held between the outer peripheral wall of the pressure pipe 55 and the inner peripheral wall of the fitting hole 57. The atmosphere-side control valve 30 is detachably attached to the casing 1a at the connection portion C2 described above. The attachment method is the same as that of the tank internal pressure control valve 4 described with reference to FIG. Therefore, in FIG. 6, the connection portion C1 of the tank internal pressure control valve 4
The reference numerals of the members of the connection portion C2 corresponding to the above are given in parentheses, and the description thereof is omitted. The connecting portion C is provided on the periphery of the insertion hole 57.
Notches 86a and 86b are formed as in the case of FIG.

Next, the internal structure of the atmosphere-side control valve 30 will be described with reference to FIG. As described above, the atmosphere-side control valve 30 has a structure in which the atmosphere release valve 28 and the atmosphere intake valve 29 are integrated. The two valves 28 and 29 are disposed vertically above and below. An atmosphere release valve 28 is disposed above the atmosphere side control valve 30, and an atmosphere intake valve 29 is disposed below the atmosphere side control valve 30. Two diaphragms 65 and 66 are provided inside the atmosphere side control valve 30. The two diaphragms 65 and 66 are formed in a disk shape from a flexible material. One of the diaphragms 65 is disposed on the side of the atmosphere release valve 28, and the periphery thereof is sandwiched between the main body 67 of the atmosphere side control valve 30 and the upper lid 68. The other diaphragm 66 is disposed on the side of the air suction valve 29, and the peripheral edge thereof is sandwiched between the main body 67 and the lower lid 69. The main body 67 and the upper lid 6
The housing D of the present invention is constituted by the lower cover 8 and the lower cover 69.

Above the diaphragm 65 disposed on the side of the atmosphere release valve 28, the diaphragm 65 and the upper lid 6 are disposed.
The space surrounded by 8 forms an atmospheric pressure chamber 70 of the atmosphere release valve 28. An air introduction port 71 is formed on a side portion of the upper lid 68 corresponding to the atmospheric pressure chamber 70 side,
The internal pressure of the atmospheric pressure chamber 70 is always atmospheric pressure. A back pressure chamber 72 of the air suction valve 29 is formed below the diaphragm 66 provided on the side of the air suction valve 29 by a space surrounded by the diaphragm 66 and the lower lid 69. The interior of the back pressure chamber 72 is communicated with the interior of the first adsorbent chamber 19 by the pressure passage 27. The space between the two diaphragms 65 and 66 is the air suction valve 29.
A positive pressure chamber 74 common to the air release valve 28 and the inside of the positive pressure chamber 74 is communicated with the second adsorbent chamber 20 by the pressure pipe 55. A part of the main body 67 extends downward on the side of the air suction valve 29, and the opening 7 of the positive pressure chamber 74 is opened.
4a are formed. Then, the main body 67 and the positive pressure chamber 74
A space surrounded by the opening 74a and the diaphragm 66 is an atmospheric pressure chamber 73 on the side of the atmospheric suction valve 29. An atmospheric suction pipe 77 is connected to the atmospheric pressure chamber 73, and its internal pressure is always atmospheric pressure. The opening 74a of the positive pressure chamber 74 is connected to the diaphragm 6 in the atmospheric pressure chamber 73.
6 is closed by a valve body 78 attached to the central portion.

A part of the main body 67 of the atmosphere side control valve 30 is an atmosphere opening pipe 75 formed to extend from the inside of the atmosphere side control valve 30 to the outside. Open air pipe 7
One end 75a of 5 is open to the atmosphere. On the other hand, the other end opening portion 75b of the atmosphere opening pipe 75 is closed by the valve body 76 attached to the center of the diaphragm 65 provided on the atmosphere opening valve 28 side inside the positive pressure chamber 74. Have been. Opening 7 at the other end of the atmosphere opening pipe 75
5b constitutes a valve seat of the atmosphere release valve 28 in the present invention.

A spring receiver 79 is attached to the center upper portion of the diaphragm 65 provided on the atmosphere release valve 28 side.
An annular positioning projection 80 is formed on the upper lid 68 so as to face the spring receiver 79. The coil spring 81 is sandwiched between the spring receiver 79 and the positioning protrusion 80, and is disposed in a state where the coil spring 81 is positioned by the both 79 and 80. The valve body 7
6 is a coil spring 81 via a spring receiver 79.
, And is pressed against the other end opening 75b of the open-to-atmosphere tube 75. Therefore, when the internal pressure of the second adsorbent chamber 20 introduced into the positive pressure chamber 74 is equal to or lower than the first predetermined value, the atmosphere release valve 28 is in a closed state.

Similarly, a coil spring 84 is disposed between a spring receiver 82 attached to the lower center of the diaphragm 66 on the side of the air suction valve 29 and an annular positioning projection 83 formed on the lower lid 69. Have been. The valve element 78 on the side of the air suction valve 29 is urged upward by the elastic force of the coil spring 84 via the spring receiver 82, and is pressed against the opening 74 a of the positive pressure chamber 74.
Therefore, the atmospheric suction valve 29 is normally closed. When purging the vapor in the canister 1 to the engine intake system, the negative pressure generated in the purge passage 14 is transmitted to the back pressure chamber 72 via the pressure passage 27, and the back pressure chamber 72 and the atmospheric pressure chamber 73 When a differential pressure is generated in the air, the atmospheric suction valve 2
The valve 9 is opened, and outside air is introduced into the canister 1 through the air suction pipe 77.

The magnitude of the opening pressure at which the atmospheric suction valve 29 and the atmospheric opening valve 28 are opened is different from each other, and the atmospheric opening valve 28 is easier to open than the atmospheric suction valve 29. This is because the vapor (air), in which fuel components have been collected and cleaned in the canister 1, is quickly discharged to the outside, thereby increasing the amount of vapor processing during the ORVR processing. Further, the atmosphere release valve 28 and the atmosphere suction valve 29 are arranged vertically above and below when the canister 1 is mounted on the vehicle. Therefore, the atmosphere release valve 28 and the atmosphere suction valve 29
, Gravity acts on the two diaphragms 65 and 66, the spring receivers 79 and 82 and the valve bodies 76 and 78 attached thereto, and closes the air release valve 28 so as to close it. On the other hand, the air suction valve 29 acts to open the valve. Here, the reason why the air release valve 28 is disposed on the upper side in the vertical direction is as follows.

That is, the opening pressure of the atmosphere release valve 28 is smaller than that of the atmosphere suction valve 29 as described above. Therefore, when the atmosphere opening valve 28 is disposed on the lower side in the vertical direction, the valve opening pressure of the atmosphere opening valve 28 is further reduced by the action of gravity. As a result, a stable closed state of the atmosphere opening valve 28 cannot be obtained, and the atmosphere opening valve 28 may be opened due to vibration of the vehicle or the like. Here, even when the air release valve 28 is disposed on the lower side in the vertical direction, the air release valve 28 can be stably closed by increasing the spring constant of the coil spring 81 provided on the valve. Can be. However,
When the configuration is such that the spring constant of the coil spring 81 is increased, when the atmosphere release valve 28 is opened, the amount of the valve body 76 separating from the other end opening 75b of the atmosphere release pipe 75 becomes smaller, The amount of air discharged into the atmosphere via the valve 28 is restricted. For this reason, in the present embodiment, the air release valve 28 is arranged on the upper side in the vertical direction.

Further, as shown in FIG.
And the air suction valve 29 have an offset S
Are only offset. here,
The “center position” of the atmosphere release valve 28 and the atmosphere suction valve 29
It means the position of the axis extending in the vertical direction through the center of the disk-shaped diaphragms 65, 66 provided in both valves 28, 29.

Next, the operation of the canister 1 according to the present embodiment having the above configuration will be described. First, how the vapor in the fuel tank 2 is introduced into the canister 1 during the steady-state vapor processing will be described with reference to FIGS. When the liquid fuel evaporates in the fuel tank 2, the amount of vapor in the space of the fuel tank 2 increases, and the internal pressure in the tank 2 increases. The high-pressure vapor in the fuel tank 2 is introduced into the positive pressure chamber 48 of the tank internal pressure control valve 4 via the vapor passage 3 and the evaporative pipe 50. The vapor introduced into the positive pressure chamber 48 urges the diaphragm 44 in the tank internal pressure control valve 4 upward against the internal pressure of the atmospheric pressure chamber 47 and the urging force of the spring. And
When the difference between the internal pressure of the fuel tank 2 introduced into the positive pressure chamber 48 and the internal pressure of the atmospheric pressure chamber 47 becomes a predetermined value or more,
The tank internal pressure control valve 4 is opened. Thereafter, the vapor is supplied to the pressure pipe 3 through the pressure pipe 42 and the introduction path 41.
1 and is further introduced into the canister 1 via the vapor introduction port 35. At this time, the fuel tank 2 is provided in the first pressure chamber 8 of the differential pressure valve 6 provided in the fuel tank 2.
Since a positive pressure equal to the inside pressure is introduced, the differential pressure valve 6 does not open, and the breather passage 12 is in a closed state.

Next, in the ORVR processing, the fuel tank 2
The manner in which the vapor inside is introduced into the canister 1 will be described with reference to FIGS. At the time of refueling, first, in order to insert a refueling nozzle (not shown) into the fuel injection pipe 9, a fueling cap 87 provided at the upper end of the fuel injection pipe 9 is removed. Therefore, the internal pressure of the fuel injection pipe 9 becomes equal to the atmospheric pressure. First pressure chamber 8 of the differential pressure valve 6
Is communicated with the inside of the fuel injection pipe 9 by the pressure passage 10, so that the inside of the pressure chamber 8 becomes equal to the atmospheric pressure. Next, when fuel is injected from a refueling nozzle (not shown), the fuel level in the fuel tank 2 rises,
The space in the fuel tank 2 is filled with vapor. Therefore, the internal pressure in the fuel tank 2 increases, and the internal pressure is introduced into the breather pipe 5. And breather tube 5
When the pressure difference between the internal pressure of the first pressure chamber 8 and the atmospheric pressure introduced into the first pressure chamber 8 reaches a predetermined value, the internal pressure in the breather pipe 5 raises the diaphragm valve 7 of the differential pressure valve 6 upward. As a result, the differential pressure valve 6 is opened. as a result,
The vapor in the fuel tank 2 is introduced into the canister 1 through the breather passage 12. At this time, the differential pressure valve 6
Is set to a low pressure with respect to the tank internal pressure control valve 4, the control valve 4 is closed.

As described above, the vapor in the fuel tank 2 is introduced into the canister 1 through the vapor passage 3 or the breather passage 12 during the steady vapor processing and the ORVR processing. Next, the manner in which the vapor introduced into the canister 1 is processed will be described with reference to FIGS. 2, 4, and 5. FIG.

The vapor introduced into the canister 1 is
After passing through the air layer 21 and the filter 23, it is introduced into the adsorbent layer 22 of the first adsorbent chamber 19. Then, the vapor is activated carbon adsorbent 25 filled in the adsorbent layer 22.
The fuel component is collected. Subsequently, the vapor is introduced into the diffusion chamber 26 via the filter 24, and moves inside the diffusion chamber 26 toward the second adsorbent chamber 20. Further, the vapor is introduced into the adsorbent layer 22 of the second adsorbent chamber 20 via the filter 24, and is collected by the activated carbon adsorbent 25 in the adsorbent layer 22 on the first adsorbent chamber 19 side. Fuel components that could not be collected are collected.

Most of the fuel component is contained in both adsorbent chambers 19, 20.
(Air) collected by the activated carbon adsorbent 25
Is sequentially passed through the filter 23, the air layer 21, and the atmosphere port 59, and is introduced into the positive pressure chamber 74 of the atmosphere-side control valve 30. Here, when the amount of vapor introduced into the canister 1 from the vapor passage 3 and the breather passage 12 is small,
That is, when the internal pressure of the canister 1 is low, the air release valve 28 and the air suction valve 29 are both closed. Therefore, the air introduced into the positive pressure chamber 74 is not discharged into the atmosphere. Then, the amount of vapor introduced into the canister 1 increases, and the canister 1
When the internal pressure in the chamber rises above a first predetermined value, the atmosphere release valve 2
The diaphragm 65 of No. 8 is urged upward by the internal pressure of the positive pressure chamber 74, and the atmosphere release valve 28 is opened. Therefore, the air introduced into the positive pressure chamber 74 is discharged outside through the atmosphere release valve 28 and the atmosphere release pipe 75. Since the atmosphere opening valve 28 is constituted by a diaphragm type valve, a large amount of air can be passed unlike a conventional check ball type valve. That is, since the canister 1 of the present embodiment has a very small airflow resistance as compared with the conventional canister that employs a check ball valve as the atmosphere release valve 28, the canister 1 of the present embodiment is an ORVR. It is possible to process a large amount of vapor in the processing. In addition, the atmosphere release valve 28
Is also superior to a check ball valve in the responsiveness of the canister 1 to changes in internal pressure.

The atmosphere opening valve 28 is opened when the internal pressure of the canister 1 increases to a first predetermined value or more. At this time, the atmosphere suction valve 29 is kept closed. This is for the following reason. That is, since the positive pressure of the first adsorbent chamber 19 is introduced into the back pressure chamber 72 on the side of the air suction valve 29 by the pressure passage 27, the diaphragm 66 on the side of the air suction valve 29 is attached upward in FIG. It is being rushed. On the other hand, the diaphragm 66 opens the internal pressure of the positive pressure chamber 74 to the opening 74.
a, and is urged downward in the figure by receiving the internal pressure of the atmospheric pressure chamber 73. Here, the internal pressure of the positive pressure chamber 74 is equal to that of the back pressure chamber 72, and the atmospheric pressure chamber 73 is constantly supplied with the atmospheric pressure from an atmospheric suction pipe 77. As a result, the valve body 78 attached to the diaphragm 66 is pressed toward the opening 74a. Therefore,
The air in the positive pressure chamber 74 does not leak out through the atmosphere suction pipe 77 to the outside.

As described above, in the canister 1 of this embodiment, when the vapor passes through the adsorbent layer 22 into the first adsorbent chamber 19 and the second adsorbent chamber 20, the fuel component is gradually collected. It has become. The flow of the vapor inside the canister 1 forms a substantially U-shaped flow path. Therefore, as the moving distance of the vapor increases, the time during which the vapor contacts the activated carbon adsorbent 25 increases.
As a result, the fuel component contained in the vapor is efficiently collected.

On the other hand, the fuel tank 2
Is cooled, the generation of vapor in the fuel tank 2 stops,
When the pressure inside the canister 1 becomes relatively high, the check ball 43a moves upward against the urging force of the spring 43b, and the vapor relief valve 43 is opened. As a result, the vapor in the canister 1 is returned to the fuel tank 2 through the pressure pipe 31, the introduction path 41, the vapor relief valve 43, the evaporation pipe 50, and the vapor passage 3 in this order.

Next, the manner in which the fuel component trapped in the canister 1 is supplied to the engine intake system will be described with reference to FIGS. When the engine is started, combustion air flows in the engine intake path. Along with the flow of the combustion air, the vicinity of the opening of the purge passage 14 on the surge tank 15 side is in a negative pressure state, and this negative pressure acts in the purge passage 14. And
Each time the ECU 17 drives the purge amount control valve 16 to open, a vapor flow from the canister 1 to the surge tank 15 is formed in the purge passage 14. Accordingly, while the internal pressure of the canister 1 is turned to a negative pressure, the negative pressure is transmitted to the back pressure chamber 72 of the atmospheric suction valve 29 through the pressure passage 27, and the internal pressure of the chamber 72 becomes equal to or less than the second predetermined value. As a result, the diaphragm 66 of the air suction valve 29 is urged downward by the negative pressure of the back pressure chamber 72, so that the air suction valve 29 is opened and the air suction pipe 7 is opened.
Fresh air is introduced into the atmospheric pressure chamber 73 through 7. Then, the outside air is introduced into the opening 74a and the positive pressure chamber 74,
Thereafter, the gas is introduced into the second adsorbent chamber 20 of the canister 1 through the pressure pipe 55 and the atmosphere port 59. As a result, the fuel component adsorbed on the activated carbon adsorbent 25 is separated and absorbed by the outside air. The outside air (vapor) having absorbed the fuel component is supplied to the second adsorbent chamber 20, the diffusion chamber 26 and the first
It is led into the purge passage 14 through the adsorbent chamber 19 and flows into the surge tank 15 via the purge amount control valve 16.

In the surge tank 15, the vapor is mixed with the combustion air that has passed through the air cleaner 90 and supplied to a cylinder (not shown). The vapor mixed with the combustion air is supplied to the fuel pump 8 in the fuel tank 2.
The fuel is discharged from the fuel injection valve 89 via the fuel tank 8 and burned in a cylinder (not shown). Here, since the air suction valve 29 is a diaphragm valve, a large amount of outside air can be introduced into the canister 1. As a result, the amount of the fuel component desorbed and absorbed by the outside air increases. The activated carbon adsorbent 25 has a reduced vapor adsorption capacity in a state of absorbing fuel components,
When the fuel component is desorbed by the outside air introduced into the canister 1, its adsorption capacity is restored again. Therefore, in the canister 1 according to the present embodiment, the activated carbon adsorbent 25 can be maintained in a state of high adsorption ability, thereby improving the vapor collection efficiency.

As described above, the canister 1 in this embodiment can process a large amount of vapor during the ORVR process. Further, when purging the vapor in the canister 1 into the engine intake system, a large amount of outside air is introduced into the canister 1 and the outside air quickly releases and absorbs the fuel component collected by the activated carbon adsorbent 25. Thereby, the vapor collecting ability of the canister 1 is improved.

The canister 1 of this embodiment has the following features in addition to the above. First, the atmosphere side control valve 30 provided in the casing 1a of the present embodiment.
Has a structure in which an atmosphere release valve 28 and an atmosphere suction valve 29 are integrated. Therefore, unlike the case where the atmosphere release valve 28 and the atmosphere suction valve 29 are separately mounted on the casing 1a, only one mounting opening (the atmosphere port 59) for the atmosphere side control valve 30 needs to be provided in the casing 1a. In addition, the number of sealing portions is reduced. In addition, since the two valves 28 and 29 are integrated, the number of parts can be reduced.

Further, in this embodiment, the tank internal pressure control valve 4 and the atmosphere side control valve 30 are separately provided to the casing 1a. Therefore, if the structure of the connecting portion C1 or the connecting portion C2 is made equal and the mounting method is unified, the tank internal pressure control valve 4 or the atmosphere side control valve 30 is commonly used even if the specifications of the casing 1a are different. And the parts can be shared. Similarly, a common casing 1a can be used even when the specifications of the two control valves 4 and 30 are different. As described above, it is possible to use common components, and therefore, in this embodiment, the manufacturing cost of the canister 1 can be reduced.

Further, both valves 28 and 29 are connected to the casing 1a.
, The maintenance of both valves 28 and 29 can be easily performed. In addition, both valves 28, 2
9 is attached to the casing 1a at the connection portions C1 and C2.
The mounting process for mounting 8, 29 to the casing 1a is shortened. Further, both valves 28 and 29 and casing 1
Unlike the case where a is connected via a hose, a hose,
There is no problem that the manufacturing cost increases with an increase in parts such as clamps.

In this embodiment, since the positive pressure chamber 74 is a common pressure chamber for the atmosphere release valve 28 and the atmosphere suction valve 29, the size of the atmosphere side control valve 30 is reduced. In addition, since the atmosphere release valve 28 and the atmosphere suction valve 29 are arranged with their respective center positions offset, the height (the length in the vertical direction in FIG. 5) of the atmosphere-side control valve 30 is reduced. The positive pressure chamber 74 can be connected to both valves 28,
Similarly to the effect of the common pressure chamber 29, the atmosphere side control valve 30
Can be reduced in size. As described above, in the present embodiment, the air release valve 28 and the air suction valve 29 have an integrated structure and are miniaturized. Therefore, when they are attached to the casing 1a, they are shown in FIG. Thus, the canister 1 can be arranged within the entire width L and the entire height H. Therefore, downsizing of the entire canister 1 is achieved. The miniaturization of the canister 1 is extremely effective when the mounting space is limited as in the case where the canister is arranged under the floor of an automobile.

Further, in the present embodiment, the atmosphere side control valve 3
Inside the cylinder 0, an atmosphere opening valve 28 having a small valve opening pressure is arranged vertically upward, and an atmosphere suction valve 29 having a large valve opening pressure is arranged below. The diaphragms 65 and 66 provided on the two valves 28 and 29 are respectively subjected to the action of gravity. At this time, the valve body 76 on the atmosphere opening valve 28 side is moved toward the other end opening 75b side of the atmosphere opening pipe 75 by gravity. Be energized. Therefore, gravity acts to close the atmosphere release valve 28. That is, the valve 28
There is no risk that the valve will open. On the other hand, since the opening pressure of the air suction valve 29 is large, the air suction valve 29 maintains the closed state even when the valve opening pressure decreases due to the action of gravity. As described above, in the canister 1 of the present embodiment, the atmosphere release valve 28 and the atmosphere intake valve 29 are disposed in the atmosphere side control valve 30 so as to be vertically opposed, and the atmosphere release valve 28 having a low valve opening pressure is provided. Is arranged on the lower side, the reliability of the atmosphere side control valve 30 is improved.

The present invention is not limited to the above embodiment, but can be implemented by changing the configuration as follows. (1) In the above embodiment, the pressure pipes 31, 55 having the O-rings 40, 64 are provided in the tank internal pressure control valve 4 and the atmosphere side control valve 30, and the fitting holes 33, 57 for inserting the same are formed in the casing 1a side. However, by changing this, the pressure pipe may be provided on the casing 1a side, and a fitting hole may be formed on the tank internal pressure control valve 4 and the atmosphere side control valve 30 side.

(2) The pressure pipes 31, 55 of the tank internal pressure control valve 4 and the atmosphere side control valve 30 are fitted with fitting projections 36a, 36.
b, 60a, and 60b may be provided as three or more.

(3) The canister 1 in this embodiment is O
Although RVR processing is possible, this may be a canister that performs only steady-state vapor processing. The present invention has a great effect when realized in a side flow type canister in which vapor flows in the horizontal direction, but can also be realized in an up-down flow type canister.

[0065]

[0066]

[0067]

According to the first aspect of the present invention, since the first valve is a diaphragm valve, a large amount of air in the adsorbent chamber of the canister is discharged to the atmosphere via the first valve. Can be. Therefore, even when a large amount of fuel vapor is introduced from the fuel tank into the canister as in the case of the ORVR process, the canister of the present invention can process this. Since the second valve is also a diaphragm valve, a large amount of outside air can be introduced into the canister from the second valve. As a result, the amount of released fuel released from the adsorbent by the outside air increases. Therefore, it is possible to maintain the adsorption capacity of the adsorbent in a high state. In addition, the manufacturing cost of the canister can be reduced by reducing the number of parts in the mounting portion when connecting both valves to the canister. Further, the space for mounting both valves is reduced, so that the canister can be downsized.

[0068] Further, the order of gravity acting on small valves of the valve opening pressure of the first valve and the second valve acts to close the Doben, the same valve by gravity becomes an open state Can be prevented. According to the invention described in claim 2, the first
Is easier to open than the second valve. Therefore,
Fuel components are collected and cleaned inside the canister
The vapor (air) can be quickly discharged to the outside,
Increasing the amount of vapor processing during ORVR processing
Can be. According to the third aspect of the invention, the canister
Maintenance is improved and parts are shared.
This makes it possible to reduce manufacturing costs. Claim
According to the invention described in claim 4 or 5, according to claim 3,
In addition to the effects of the canister, the housing is
The mounting process is easy when mounting
Is shortened. According to the invention described in claim 6, the canister
Mounted on vehicles, etc. because the overall height of the star can be reduced
This can reduce the space required for the operation.

According to the invention of claim 7 , according to claim 6,
In addition to the operation of the canister described in (1), the housing can be downsized, so that the entire canister can be downsized. Therefore, when the canister is mounted on a vehicle, the mounting space can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an entire system when a canister according to an embodiment is mounted on an automobile.

FIG. 2 is a partial sectional view of a canister according to the embodiment.

FIG. 3 is a side view of the same.

FIG. 4 is a sectional view taken along line AA in FIG. 2;

FIG. 5 is a sectional view taken along the line BB in FIG. 2;

FIG. 6 is a perspective view showing a method of mounting a tank internal pressure control valve and an atmosphere side control valve.

FIG. 7 is a front view showing a conventional arrangement example of a tank internal pressure control valve, an atmosphere release valve, and an atmosphere suction valve.

FIG. 8 shows another example of the arrangement, (a) is a plan view,
(B) is a front view.

FIG. 9 is a perspective view showing another example of the arrangement.

[Description of Signs] 1 ... canister, 19 ... first adsorbent chamber (adsorbent chamber), 2
0: second adsorbent chamber (adsorbent chamber), 25: activated carbon adsorbent (adsorbent), 28: atmosphere opening valve (first valve), 29: atmosphere suction valve (second valve), 30: atmosphere Side control valve, 59 ... atmosphere port (opening), 65 ... diaphragm, 66 ... diaphragm, 74 ... positive pressure chamber (pressure chamber), 75b ... atmospheric opening pipe other end opening (valve seat), 76 ... valve element, D …housing.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 7/17 F02M 25/08 311

Claims (7)

(57) [Claims] 1. A casing having an adsorbent chamber containing an adsorbent for collecting evaporated fuel, provided in the casing, and when an internal pressure of the adsorbent chamber becomes equal to or higher than a first predetermined value. A first valve that opens and discharges air that does not contain a fuel component in the adsorbent chamber to the atmosphere; and a first valve that is also provided in the casing and that has an internal pressure of the adsorbent chamber equal to or lower than a second predetermined value. A second valve for opening the valve when it becomes the second and introducing outside air into the adsorbent chamber. A housing is provided in the casing, and an opening communicating between the housing and the casing is provided in the casing. formed with the vertical direction up and down within the housing said first and second valves and the diaphragm valve
And the valve with the highest valve opening pressure
On the other hand, a valve with a low valve opening pressure
The valve body is located vertically above and its valve body is
A canister characterized in that the valve is biased to the canister. 2. The canister according to claim 1, wherein a valve having a small valve opening pressure is the first valve . 3. The canister according to claim 1, wherein said housing is provided as a separate body detachable from a casing.
It features and be Ruki Yanisuta that was. 4. The canister according to claim 3, wherein the canister is provided on a side wall of the housing, and is provided inside the housing.
A pipe that communicates with a space and is provided on a side wall of the casing, and the pipe is inserted thereinto.
A plurality of fitting projections are formed on the outer peripheral surface of the pipe, and the fitting insertion hole has a shape in which the fitting projections can be inserted.
Notches are formed, and the inner peripheral surface of the insertion hole is
It is characterized in that a groove part to be fitted with the fitting projection is formed.
Canister. 5. The canister according to claim 3, wherein said canister is provided on a side wall of said casing, and is provided inside said casing.
A pipe communicating with a space, and a pipe provided on a side wall of the housing for inserting the pipe.
A plurality of fitting projections are formed on the outer peripheral surface of the pipe, and the fitting insertion hole has a shape in which the fitting projections can be inserted.
Notches are formed, and the inner peripheral surface of the insertion hole is
It is characterized in that a groove part to be fitted with the fitting projection is formed.
Canister. 6. When the fuel vapor is water when the vehicle is mounted.
The side flow type that flows in a horizontal direction as described in claim 1.
On the canister. 7. The canister according to claim 6, wherein a diaphragm provided in the first valve and the second valve is provided.
And the center position of the diaphragm is fixed.
The space between the two diaphragms
A canister characterized by a common pressure chamber between both valves
Ta.