Canister

Abstract

To provide a canister which can stably hold a filter while reducing a manufacturing cost.SOLUTION: An aspect of the present disclosure is a canister having an outside case, an inside case disposed in the outside case, a first adsorption chamber disposed in the inside case, a second adsorption chamber disposed between the first adsorption chamber and an atmospheric port in the inside case, a first adsorption material accommodated in the first adsorption chamber, a second adsorption material accommodated in the second adsorption chamber, and a plate-shaped filter disposed between the second adsorption material and the atmospheric port. The filter has a first plate face in contact with the second adsorption material, a second plate face in contact with the outside case, and a side face in contact with the first plate face and the second plate face. At least one of the second plate face and the side face has a release part which is separated from both the inside case and the outside case.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a canister. [Background technology]

[0002] A canister is attached to the fuel tank of a vehicle to prevent evaporated fuel from being released into the atmosphere. The canister adsorbs evaporated fuel onto an adsorbent, draws in air to desorb the fuel from the adsorbent, and then supplies the fuel to the engine.

[0003] A canister is usually provided with a plurality of adsorption chambers. A canister in which the flow direction of gas in the plurality of adsorption chambers is changed is known (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-120492 A Summary of the Invention [Problem to be solved by the invention]

[0005] In a canister having multiple adsorption chambers with different flow directions as described above, depending on the position and shape of the adsorption chambers, there may be some areas where the mold cannot be removed during molding of the canister case. In such cases, it is necessary to divide the case into multiple parts.

[0006] In a canister whose case is divided into multiple parts, the adsorbent filter is arranged across the multiple parts, so there is a risk that the filter may fall off due to vibrations of the vehicle.

[0007] An object of one aspect of the present disclosure is to provide a canister that can stably hold a filter while reducing manufacturing costs. [Means for solving the problem]

[0008] One aspect of the present disclosure is a canister that adsorbs and desorbs evaporated fuel generated in a fuel tank of a vehicle. The canister includes an outer case having a charge port for taking in evaporated fuel, a purge port for discharging evaporated fuel, and an atmospheric port open to the atmosphere, an inner case disposed inside the outer case and having an internal space to which the atmospheric port is connected directly or via another chamber, a first adsorption chamber disposed in the internal space of the inner case, a second adsorption chamber disposed in the internal space of the inner case between the first adsorption chamber and the atmospheric port in a flow path of evaporated fuel, a first adsorbent housed in the first adsorption chamber, a second adsorbent housed in the second adsorption chamber, and a plate-shaped filter disposed in the flow path of evaporated fuel between the second adsorbent and the atmospheric port.

[0009] The flow direction of the gas in the second adsorption chamber intersects with the flow direction of the gas in the first adsorption chamber. The filter has a first plate surface in contact with the second adsorbent, a second plate surface at least a portion of which contacts the outer case, and a side surface connecting the first plate surface and the second plate surface. At least one of the second plate surface and the side surface has an opening separated from both the inner case and the outer case.

[0010] According to this configuration, by inserting the inner case into the outer case, a canister having a first adsorption chamber and a second adsorption chamber with different flow directions can be obtained. Also, since the second plate surface of the filter contacts the outer case and an opening is provided on at least one of the second plate surface and the side surface of the filter, the filter can be stably held while ensuring a gas flow path.

[0011] In one embodiment of the present disclosure, the outer case may have a rib extending in a direction parallel to the second plate surface of the filter. The second plate surface may have a contact portion that contacts the rib and an open portion. With this configuration, the filter can be stably held while ensuring the area of ​​the open portion of the filter.

[0012] In one aspect of the present disclosure, the inner case may have a housing portion that covers a side surface of the filter. The housing portion may contact the rib. With this configuration, the load that the filter receives from the rib is distributed to the housing portion. Therefore, damage to the filter due to vibration of the vehicle can be suppressed.

[0013] In one aspect of the present disclosure, the rib may extend in a direction parallel to the direction of insertion of the inner case into the outer case. The rib may have an inclined guide surface to guide the insertion of the inner case into the outer case. This configuration facilitates the insertion of the inner case into the outer case, thereby promoting the effect of reducing manufacturing costs.

[0014] In one aspect of the present disclosure, the outer case may have a holding portion that, together with the rib, sandwiches the inner case. With this configuration, vibration of the inner case is suppressed, thereby promoting the effect of stably holding the filter.

[0015] In one embodiment of the present disclosure, the outer case may have a main body into which the inner case is inserted. The rib may have a support portion that contacts the second plate surface of the filter and a leg portion that connects the main body portion and the support portion. The width of the support portion may be larger than the width of the leg portion. With this configuration, the contact area between the filter and the rib can be increased.

[0016] In one aspect of the present disclosure, the side surface may have an opening. With this configuration, the entire second plate surface can be supported by the outer case, improving the stability of holding the filter. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic cross-sectional view of a canister according to an embodiment. [Diagram 2] FIG. 2 is a schematic cross-sectional view of a main body of an outer case in the canister of FIG. [Diagram 3]3A is a schematic perspective view of an inner case in the canister of FIG. 1, and FIG. 3B is a schematic cross-sectional view of the periphery of a second adsorption chamber in the canister of FIG. [Figure 4] 4A is a schematic front view showing the relationship between the inner case and the ribs in the canister of FIG. 1, and FIG. 4B is a schematic bottom view showing the relationship between the inner case and the ribs in the canister of FIG. [Diagram 5] 5A and 5B are schematic cross-sectional views of the periphery of a second adsorption chamber of a canister in an embodiment different from that in FIG. 3B. [Figure 6] 6A and 6B are schematic cross-sectional views of a rib in an embodiment different from that in FIG. 1, and FIG. 6C is a schematic cross-sectional view of the periphery of a second adsorption chamber of a canister in an embodiment different from that in FIG. 3B. [Figure 7] FIG. 7 is a schematic cross-sectional view of a canister in an embodiment different from that in FIG. [Figure 8] 8A is a schematic perspective view of an inner case in the canister of FIG. 7, and FIG. 8B is a schematic cross-sectional view of the periphery of a second adsorption chamber in the canister of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings. [1. First embodiment] [1-1. Configuration] A canister 1 shown in FIG. 1 is an evaporated fuel treatment device that adsorbs and desorbs evaporated fuel generated in a fuel tank of a vehicle.

[0019] The canister 1 includes an outer case 2, an inner case 3, a first adsorption chamber 4, a second adsorption chamber 5, a third adsorption chamber 6, a first adsorbent 7, a second adsorbent 8, and a third adsorbent 9.

[0020] <Outer case> The outer case 2 is a housing having an internal space in which the inner case 3 and the third adsorption chamber 6 are disposed, a charge port 21, a purge port 22, and an atmospheric port .

[0021] The charge port 21 is connected to a fuel tank of the vehicle by a pipe and is configured to take in the evaporated fuel generated in the fuel tank into the canister 1.

[0022] The purge port 22 is connected to an intake pipe of an engine of a vehicle via a purge valve, and is configured to discharge the evaporated fuel in the canister 1 from the canister 1 and supply it to the engine.

[0023] The atmospheric port 23 is open to the atmosphere. The atmospheric port 23 releases gas from which evaporated fuel has been removed into the atmosphere. The atmospheric port 23 also takes in outside air (i.e., purged air) to desorb (i.e., purge) the evaporated fuel adsorbed by the canister 1.

[0024] The outer case 2 is provided with a charge port 21, a purge port 22, and an atmospheric port 23, and has a main body portion 2A having an opening through which the inner case 3 can be inserted, and a lid portion 2B attached to the opening of the main body portion 2A.

[0025] As shown in FIG. 2, the main body 2A has a first space 2C in which the inner case 3 is disposed, a second space 2D in which the third adsorption chamber 6 is disposed, and a communication portion 2E that forms a communication passage between the first space 2C and the second space 2D.

[0026] The outer case 2 also has a plate-like rib 24 protruding from the inner surface that constitutes the first space 2C of the main body 2A. The rib 24 extends in the first space 2C in a direction parallel to the insertion direction of the inner case 3 (i.e., a direction parallel to the second plate surface 52 of the first filter 5A that defines the second adsorption chamber 5). The thickness direction of the rib 24 is perpendicular to the protruding direction and extending direction of the rib 24 from the main body 2A. The width (i.e., thickness) of the rib 24 is constant along the protruding direction from the main body 2A.

[0027] <Inner case> The inner case 3 shown in Figs. 3A and 3B is disposed inside the outer case 2, and has an internal space to which the atmospheric port 23 is directly connected without passing through another adsorption chamber.

[0028] The inner case 3 is obtained, for example, by molding resin using a mold. The inner case 3 has a cylindrical body 31, a sealing member 32, and a protrusion 33. The cylindrical body 31 has a first end 31A that changes the flow direction of gas, and a flange-shaped second end 31B.

[0029] The first end 31A is an end that is connected to the atmospheric port 23. The first end 31A has a rotating part 31D that rotates the gas flow direction by approximately 90° with respect to the first adsorption chamber 4 that is formed in the center of the cylindrical body 31, and a storage part 31F that has an inner diameter larger than that of the rotating part 31D.

[0030] The rotating part 31D is provided adjacent to the first adsorption chamber 4 and is partitioned from the first adsorption chamber 4 by a plurality of partition members 31C extending in the axial direction. The rotating part 31D forms a space that communicates with the first adsorption chamber 4 and the second adsorption chamber 5 formed by the storage part 31F.

[0031] The central axis of the cylindrical body 31 is bent at the rotating part 31D. Furthermore, a rib 31E is disposed inside the rotating part 31D. The rib 31E contacts the second adsorbent 8 from the side opposite to the first filter 5A. Note that the rib 31E is omitted from FIG. 3A.

[0032] The storage section 31F is a cylindrical section provided contiguous with the rotating section 31D and further outward in the axial direction of the cylindrical body 31 than the rotating section 31D. In the storage section 31F, a second adsorption chamber 5 is formed by disposing a second adsorbent 8 therein.

[0033] First filter 5A is accommodated in an end portion of accommodating portion 31F. Accommodating portion 31F covers side surface 53 of first filter 5A. An outer end portion of accommodating portion 31F contacts rib 24 of outer case 2.

[0034] The second end 31B is an end opposite to the first end 31A. In other words, the second end 31B is an end that communicates with the third adsorption chamber 6. The second end 31B has a larger outer diameter than the other portions of the cylindrical body 31 than the second end 31B. However, the outer diameter of the second end 31B may be equal to or smaller than the outer diameter of the first end 31A.

[0035] A seal member 32 is disposed on the outer circumferential surface of the second end portion 31B. The seal member 32 is an elastic ring-shaped member, and is fitted into a groove provided on the outer circumferential surface of the second end portion 31B. The seal member 32 is disposed so as to fill a gap at the joint between the outer case 2 and the inner case 3.

[0036] An O-ring, a gasket, or the like can be used as the sealing member 32. The position of the inner case 3 relative to the outer case 2 is maintained by the frictional force of the sealing member 32. In this embodiment, the inner case 3 is not joined to the outer case 2 at any portion other than the sealing member 32. That is, in this embodiment, there are no welding points between the inner case 3 and the outer case 2.

[0037] The protrusion 33 protrudes from the first end 31A towards the atmospheric port 23. The protrusion 33 presses the second filter 5B towards the atmospheric port 23.

[0038] <1st adsorption chamber> As shown in FIG. 1, the first adsorption chamber 4 is disposed in the internal space of the inner case 3 (specifically, in the center of the cylindrical body 31).

[0039] The first adsorption chamber 4 contains a first adsorbent 7, and is in communication with the third adsorption chamber 6 via a flow path defined by the outer case 2 so that gas can freely flow between the first adsorption chamber 4 and the third adsorption chamber 6. The first adsorption chamber 4 is arranged to be aligned with the third adsorption chamber 6 in the radial direction of the third adsorption chamber 6 so that the gas flow direction is parallel to that of the third adsorption chamber 6.

[0040] The first adsorption chamber 4 is defined by a first filter 4A and a second filter 4B disposed inside the cylindrical body 31 of the inner case 3. As shown in Fig. 3B, the first filter 4A is in contact with a partition member 31C.

[0041] 1, the second filter 4B separates the first adsorption chamber 4 from a communication passage with the third adsorption chamber 6. The second filter 4B is pressed toward the second adsorption chamber 5 and the atmospheric port 23 by a spring 4E via a lattice-shaped grid 4C. The grid 4C may be slit-shaped, porous, or the like.

[0042] The first filter 4A and the second filter 4B that define the first adsorption chamber 4 are configured to allow gas to pass therethrough while not allowing the first adsorbent 7 to pass therethrough. In other words, the filters 4A and 4B sandwich the first adsorbent 7 within the first adsorption chamber 4.

[0043] <Second adsorption chamber> The second adsorption chamber 5 is disposed in the internal space of the inner case 3 (specifically, within the first end portion 31A).

[0044] The second adsorption chamber 5 contains a second adsorbent 8 and is disposed in the flow path of the evaporated fuel between the first adsorption chamber 4 and the atmospheric port 23. The second adsorption chamber 5 communicates with both the first adsorption chamber 4 and the atmospheric port 23. The direction of gas flow in the second adsorption chamber 5 intersects with the direction of gas flow in the first adsorption chamber 4 (specifically, is approximately perpendicular).

[0045] The area of ​​a cross section perpendicular to the gas flow direction of the second adsorption chamber 5 is larger than the area of ​​a cross section perpendicular to the gas flow direction of the first adsorption chamber 4. Furthermore, the length of the second adsorption chamber 5 in the gas flow direction is smaller than the length of the first adsorption chamber 4 in the gas flow direction. However, the length of the second adsorption chamber 5 in the gas flow direction may be larger than the length of the first adsorption chamber 4 in the gas flow direction.

[0046] 3B, the second adsorption chamber 5 is defined by a first filter 5A disposed so as to close the first end 31A of the inner case 3, and a step and a rib 31E within the first end 31A. In addition, a second filter 5B is disposed between the first filter 5A and the atmospheric port 23.

[0047] The first filter 5A is a plate-like member disposed between the second adsorbent 8 and the atmospheric port 23 in the flow path of the evaporated fuel, and separates the space communicating with the atmospheric port 23 from the second adsorption chamber 5.

[0048] The first filter 5A is press-fitted into the accommodation portion 31F of the inner case 3 so as to overlap the second adsorbent 8. That is, the accommodation portion 31F accommodates the second adsorbent 8 and the first filter 5A.

[0049] The first filter 5A has a first plate surface 51 in contact with the second adsorbent 8, a second plate surface 52 a portion of which contacts the rib 24 of the outer case 2, and a side surface 53 connecting the first plate surface 51 and the second plate surface 52.

[0050] The first plate surface 51 covers the entire surface of the second adsorbent 8 from which gas is discharged toward the atmosphere port 23. The side surface 53 is in contact with the storage section 31F of the inner case 3 from the inside.

[0051] 4A and 4B , the second plate surface 52 has a contact portion that contacts the rib 24 of the outer case 2 and an open portion that does not contact the rib 24. The open portion of the second plate surface 52 is a portion separated from both the inner case 3 and the outer case 2.

[0052] 4A and 4B, the second plate surface 52 is in contact with a plurality of ribs 24 arranged in parallel to one another, but the second plate surface 52 may be in contact with only one rib 24. When the second plate surface 52 is in contact with a plurality of ribs 24, a plurality of contact portions and a plurality of open portions are arranged alternately on the second plate surface 52.

[0053] Rib 24 contacts first filter 5A as well as the edge of storage portion 31F. Specifically, rib 24 contacts storage portion 31F at least at two points on either side of the contact portion of second plate surface 52 in the extension direction of rib 24.

[0054] The open portion of the first filter 5A faces the inner surface of the outer case 2 from which the ribs 24 protrude. Therefore, the gas that has passed through the second adsorption chamber 5 collides with this inner surface, causing the flow direction to change.

[0055] 3 is fixed to the outer case 2 by, for example, ultrasonic welding. The inner case 3 is inserted into the outer case 2 so that the protrusions 33 are pressed against the second filter 5B. Therefore, if the second filter 5B can be held by the protrusions 33, the second filter 5B does not necessarily have to be fixed to the outer case 2.

[0056] The first filter 5A defining the second adsorption chamber 5 and the second filter 5B disposed adjacent to the atmospheric port 23 have the same function as the filters 4A and 4B of the first adsorption chamber 4.

[0057] The second adsorbent 8 is a block-shaped agglomerate of granular adsorbent or an aggregate of fibrous adsorbent. The surface of the second adsorbent 8 opposite to the atmospheric port 23 contacts the step of the first end 31A and the rib 31E. Therefore, a buffer space formed by the rotating part 31D is provided between the second adsorbent 8 and the partition member 31C. No adsorbent is disposed in this buffer space.

[0058] Since the first filter 5A is not welded in the second adsorption chamber 5, separation of the adsorbent agglomerates or aggregates due to vibration during welding can be suppressed. Furthermore, since the cross-sectional area of ​​the second adsorption chamber 5 is larger than the cross-sectional area of ​​the first adsorption chamber 4, even if agglomerates or aggregates with high airflow resistance are used as the second adsorbent 8, an increase in the airflow resistance of the canister 1 can be suppressed.

[0059] The gas that has passed through the first adsorption chamber 4 has its flow direction changed by the rotating part 31D and enters the second adsorption chamber 5. Furthermore, the gas that has passed through the second adsorption chamber 5 has its flow direction changed again by the inner wall of the outer case 2 that faces the first filter 5A. The gas is then released from the atmosphere port 23.

[0060] The inner case 3 is assembled to the main body 2A of the outer case 2 in a cartridge state filled with the first adsorbent 7 and the second adsorbent 8. After assembly of the inner case 3, the lid 2B of the outer case 2 is attached to the main body 2A.

[0061] <3rd adsorption chamber> As shown in FIG. 1, the third adsorption chamber 6 is disposed inside the outer case 2 and outside the inner case 3 (specifically, in the second space 2D of the outer case 2).

[0062] The third adsorption chamber 6 contains the third adsorbent 9, and is connected to a charge port 21 and a purge port 22. The third adsorption chamber 6 adsorbs the evaporated fuel taken in through the charge port 21. The third adsorption chamber 6 also discharges the adsorbed evaporated fuel from the purge port 22.

[0063] The third adsorption chamber 6 is defined by a first filter 6A and a second filter 6B, each of which is disposed inside the outer case 2. The first filter 6A separates the third adsorption chamber 6 from a space communicating with a charge port 21 and a purge port 22 connected to the third adsorption chamber 6.

[0064] The second filter 6B separates a communication passage with the first adsorption chamber 4 from the third adsorption chamber 6. The second filter 6B is pressed by a spring 6D toward the charge port 21 and the purge port 22 via a lattice-shaped grid 6C. The grid 6C may be slit-shaped, porous, or the like.

[0065] The filters 6A, 6B defining the third adsorption chamber 6 have a similar function to the filters 4A, 4B of the first adsorption chamber 4.

[0066] The evaporated fuel taken in from the charge port 21 is adsorbed by the third adsorbent 9 in the third adsorption chamber 6. The evaporated fuel that cannot be adsorbed in the third adsorption chamber 6 moves to the first adsorption chamber 4 in the inner case 3, and is adsorbed by the first adsorbent 7 in the first adsorption chamber 4.

[0067] Furthermore, the evaporated fuel that cannot be adsorbed in the first adsorption chamber 4 moves to the second adsorption chamber 5 inside the inner case 3, and is adsorbed by the second adsorbent 8 in the second adsorption chamber 5. The gas with the adsorbed evaporated fuel is released from the atmospheric port 23.

[0068] Furthermore, by drawing air in through the atmospheric port 23, the evaporated fuel that has been adsorbed by the adsorbents in the first adsorption chamber 4, the second adsorption chamber 5, and the third adsorption chamber 6 is discharged to the engine through the purge port 22. As a result, air containing evaporated fuel is supplied to the engine.

[0069] <Adsorbent> The first adsorbent 7, the second adsorbent 8, and the third adsorbent 9 each adsorb the evaporated fuel and butane supplied to the canister 1 together with air, etc. Also, the evaporated fuel and butane are desorbed by the introduction of external air. The desorbed evaporated fuel is supplied to the engine.

[0070] The first adsorbent 7, the second adsorbent 8, and the third adsorbent 9 can be made of materials such as activated carbon and zeolite. Examples of activated carbon that can be used include an aggregate of granular adsorbents, activated carbon formed into a honeycomb shape, and activated carbon fiber formed into a sheet, rectangular parallelepiped, cylindrical, or prismatic shape. The first adsorbent 7, the second adsorbent 8, and the third adsorbent 9 may be the same type of adsorbent, or different types of adsorbents.

[0071] <Modification of the first embodiment> 5A, the rib 24 may have an inclined guide surface 24A to guide the insertion of the inner case 3 into the outer case 2. The guide surface 24A is inclined so that the distance from the inner surface of the outer case 2 increases as the guide surface approaches the atmospheric port 23.

[0072] In other words, the guide surface 24A is configured to guide the first end 31A of the inner case 3, which is inserted into the outer case 2 from the side opposite to the atmospheric port 23, into the inside of the first space 2C of the outer case 2. This facilitates the insertion of the inner case 3 into the outer case 2, thereby promoting the effect of reducing the manufacturing costs of the canister 1.

[0073] 5B, the outer case 2 may have a retaining portion 25. The retaining portion 25 is a plate-like or block-like portion that, together with the rib 24, sandwiches the first end portion 31A of the inner case 3. The retaining portion 25 protrudes from the inner surface of the main body portion 2A so as to face the rib 24 in the first space 2C of the outer case 2. The retaining portion 25 suppresses vibration of the inner case 3. This promotes the effect of stably holding the first filter 5A.

[0074] 6A and 6B, the rib 24 may have a support portion 24B and a leg portion 24C. The support portion 24B is a portion that contacts the second plate surface 52 of the first filter 5A. The leg portion 24C is a portion that connects the main body portion 2A of the outer case 2 and the support portion 24B.

[0075] The width of support portion 24B is greater than the width of leg portion 24C. That is, rib 24 may have a T-shaped cross section perpendicular to the extension direction. This increases the contact area between first filter 5A and rib 24. Also, by chamfering support portion 24B as shown in FIG. 6B, damage to first filter 5A can be suppressed.

[0076] 6C, the rib 24 may protrude from the inner surface of the wall of the main body 2A of the outer case 2, where the atmospheric port 23 is provided. This makes the rib 24 more flexible, facilitating assembly of the inner case 3 to the outer case 2.

[0077] [1-2. Effects] According to the embodiment described above in detail, the following effects can be obtained. (1a) By inserting the inner case 3 into the outer case 2, a canister 1 having a first adsorption chamber 4 and a second adsorption chamber 5 with different flow directions can be obtained. In addition, the second plate surface 52 of the first filter 5A contacts the outer case 2 and an opening is provided in the second plate surface 52 of the first filter 5A, so that the first filter 5A can be stably held while ensuring a gas flow path.

[0078] (1b) Second plate surface 52 of first filter 5A comes into contact with rib 24 extending parallel to second plate surface 52, thereby making it possible to stably hold first filter 5A while ensuring the area of ​​the open portion of first filter 5A.

[0079] (1c) The load that the first filter 5A receives from the ribs 24 is distributed to the housing portion 31F by the housing portion 31F of the inner case 3 coming into contact with the ribs 24. This makes it possible to suppress damage to the first filter 5A due to vibrations of the vehicle.

[0080] [2. Second embodiment] [2-1. Configuration] 7 adsorbs and desorbs evaporated fuel generated in a fuel tank. The canister 101 includes an outer case 2, an inner case 103, a first adsorption chamber 4, a second adsorption chamber 105, a third adsorption chamber 6, a first adsorbent 7, a second adsorbent 8, and a third adsorbent 9.

[0081] The outer case 2, the first adsorption chamber 4, the third adsorption chamber 6, and the adsorbents 7, 8, and 9 of the canister 101 are similar to those of the canister 1 in FIG. 1, and therefore the same reference numerals are used and the description thereof will be omitted.

[0082] <Inner case> The inner case 103 is disposed inside the outer case 2 and has an internal space connected to communicate with the atmospheric port 23. The inner case 103 is obtained, for example, by molding a resin using a mold.

[0083] 8A and 8B, the inner case 103 has a cylindrical body 131, a sealing member 32, and a protruding portion 33. The sealing member 32 and the protruding portion 33 are the same as those of the inner case 3 of the canister 1 in FIG.

[0084] The cylindrical body 131 has a first end 131A and a second end 131B. The second end 131B is the same as the second end 31B of the inner case 3 in FIG. 1. The first end 131A is an end that is connected to the atmospheric port 23. The first end 131A has a rotating part 131D that is partitioned from the first adsorption chamber 4 by a partition member 131C, and a storage part 131F. The partition member 131C and the rotating part 131D are the same as the partition member 31C and the rotating part 31D of the inner case 3 in FIG. 1.

[0085] 1. Specifically, the storage portion 131F has a notch 131G that exposes a part of the side surface 153 of the first filter 105A from the inner case 103. The notch 131G is provided in a region of the storage portion 131F that is close to the atmospheric port 23.

[0086] <Second adsorption chamber> The second adsorption chamber 105 is disposed in the internal space of the inner case 103 (specifically, within the first end portion 131A).

[0087] The second adsorption chamber 105 contains the second adsorbent 8 and is disposed in the flow path of the evaporated fuel between the first adsorption chamber 4 and the atmospheric port 23. The function of the second adsorption chamber 105 is the same as that of the second adsorption chamber 5 of the canister 1 in FIG.

[0088] The second adsorption chamber 105 is defined by a first filter 105A disposed so as to close the first end 131A of the inner case 103, and a step within the first end 131A. In addition, a second filter 5B, which is the same as that in the canister 1 in Fig. 1, is disposed between the first filter 105A and the atmospheric port 23 (see Fig. 7).

[0089] The first filter 105A is a plate-like member disposed between the second adsorbent 8 and the atmospheric port 23 in the flow path of the evaporated fuel, and separates a space communicating with the atmospheric port 23 from the second adsorption chamber 105. The first filter 105A that defines the second adsorption chamber 105 has a function similar to that of the filters 4A and 4B of the first adsorption chamber 4.

[0090] First filter 105A is press-fitted into accommodation portion 131F of inner case 103 so as to overlap second adsorbent 8. That is, accommodation portion 131F accommodates second adsorbent 8 and first filter 105A.

[0091] The first filter 105A has a first plate surface 151 that contacts the second adsorbent 8, a second plate surface 152 that contacts the inner surface of the main body 2A of the outer case 2, and a side surface 153 that connects the first plate surface 151 and the second plate surface 152.

[0092] The first plate surface 151 covers the entire surface of the second adsorbent 8 from which gas is discharged toward the atmosphere port 23. The second plate surface 152 is entirely in contact with the inner surface of the main body 2A. A part of the side surface 153 is exposed from the notch 131G of the storage section 131F.

[0093] In this manner, the side surface 153 has an opening that is separated from both the inner case 103 and the outer case 2. The gas that has passed through the second adsorbent 8 flows from the opening of the side surface 153 of the first filter 105A toward the atmospheric port 23.

[0094] [2-2. Effects] According to the embodiment described above in detail, the following effects can be obtained. (2a) Since second plate surface 152 of first filter 105A can be entirely supported by outer case 2, first filter 105A is held more stably.

[0095] 3. Other embodiments Although the embodiments of the present disclosure have been described above, it goes without saying that the present disclosure is not limited to the above-described embodiments and can take various forms.

[0096] (3a) In the canister of the above embodiment, the first filter disposed between the second adsorbent and the atmospheric port may be fixed to the housing of the inner case by, for example, ultrasonic welding.

[0097] (3b) In the canister of the above embodiment, an auxiliary chamber for accommodating an adsorbent may be further provided between the inner case and the atmospheric port. In other words, the atmospheric port may be connected to the inner case via another chamber (i.e., the auxiliary chamber).

[0098] (3c) The function of one component in the above embodiments may be distributed among multiple components, or the functions of multiple components may be integrated into one component. In addition, a part of the configuration of the above embodiments may be omitted. In addition, at least a part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. Note that all aspects included in the technical idea identified from the wording of the claims are embodiments of the present disclosure. [Explanation of symbols]

[0099] 1,101...canister, 2...outer case, 2A...main body, 2B...lid, 2C...First space, 2D...Second space, 2E...Communication section, 3,103...Inner case, 4...first adsorption chamber, 5,105...second adsorption chamber, 5A,105A...first filter, 5B: second filter; 6: third adsorption chamber; 7: first adsorbent; 8: second adsorbent; 9...third adsorbent, 21...charge port, 22...purge port, 23...atmospheric port, 24... rib, 24A... guide surface, 24B... support portion, 24C... leg portion, 25... holding portion, 31,131...Cylinder, 31A,131A...First end, 31B,131B...Second end, 31C, 131C...partition member, 31D, 131D...rotating part, 31F, 131F... accommodation portion, 32... sealing member, 51, 151... first plate surface, 52,152…2nd plate surface, 53,153…side surface, 131G…cut edge.

Claims

1. A canister that adsorbs and desorbs evaporated fuel generated in a fuel tank of a vehicle, an outer case having a charge port for taking in the evaporated fuel, a purge port for discharging the evaporated fuel, and an atmosphere port open to the atmosphere; an inner case disposed inside the outer case and having an internal space to which the atmospheric port is connected directly or via another chamber; A first adsorption chamber disposed in the internal space of the inner case; a second adsorption chamber disposed in the internal space of the inner case between the first adsorption chamber and the atmospheric port in the flow path of the evaporated fuel; a first adsorbent housed in the first adsorption chamber; a second adsorbent housed in the second adsorption chamber; a plate-shaped filter disposed between the second adsorbent and the atmospheric port in the fuel vapor flow path; Equipped with a gas flow direction in the second adsorption chamber intersects with a gas flow direction in the first adsorption chamber, The filter comprises: a first plate surface in contact with the second adsorbent; a second plate surface at least a portion of which contacts the outer case; A side surface connecting the first plate surface and the second plate surface; having At least one of the second plate surface and the side surface has an opening separated from both the inner case and the outer case.

2. 2. The canister of claim 1, the outer case has a rib extending in a direction parallel to the second plate surface of the filter, The second plate surface is A contact portion that contacts the rib; The opening; A canister having

3. 3. The canister according to claim 2, the inner case has a housing portion that covers the side surface of the filter, The canister, wherein the receiving portion contacts the rib.

4. 4. The canister according to claim 2 or 3, the rib extends in a direction parallel to a direction in which the inner case is inserted into the outer case, The rib has an inclined guide surface to guide insertion of the inner case into the outer case.

5. 4. The canister according to claim 2 or 3, The canister, wherein the outer case has a holding portion that, together with the rib, sandwiches the inner case.

6. 4. The canister according to claim 2 or 3, the outer case has a main body into which the inner case is inserted, The rib is A support portion contacting the second plate surface of the filter; A leg portion connecting the main body portion and the support portion; having The canister, wherein the width of the support portion is greater than the width of the leg portion.

7. 3. The canister according to claim 1 or 2, The side surface of the canister has the opening.

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