Filtering canister

Abstract

The present disclosure relates to a filter can that adsorbs and desorbs evaporated fuel generated in a fuel tank of a vehicle, and has an adsorbent and a cylindrical body. The adsorbent adsorbs the evaporated fuel and is formed in one block. The cylindrical body has a cylindrical shape and holds the adsorbent in a state in which the adsorbent is inserted inside. By making an abutting surface in an inner wall surface of the cylindrical body abut against a side surface of the inserted adsorbent, movement of the adsorbent in a direction orthogonal to a central axis of the cylindrical body is suppressed, in which the abutting surface is at least a part of the range of the inner wall surface of the cylindrical body in the length direction of the central axis. The cylindrical body has an inclined surface on at least a part of the range from an opening end of an opening through which the adsorbent can be inserted to the abutting surface, the inclined surface being formed by making the inner wall surface of the cylindrical body inclined toward the direction close to the central axis of the cylindrical body from the opening end of the opening as a starting point.

Description

Technical Field

[0001] This disclosure relates to filter tanks. Background Technology

[0002] A filter canister is installed in the vehicle's fuel tank to prevent evaporated fuel from being emitted into the atmosphere. The filter canister adsorbs evaporated fuel onto an adsorbent such as activated carbon, and uses intake air to desorb the fuel from the adsorbent for purging, and then supplies the evaporated fuel to the engine. Japanese Patent Application Publication No. 2021-50656 (hereinafter referred to as Patent Document 1) discloses a filter canister containing a honeycomb adsorbent. Specifically, in the filter canister described in Patent Document 1, the honeycomb adsorbent, which is formed in a cylindrical shape, is housed in a shell formed in a cylindrical shape. Summary of the Invention

[0003] However, in the filter canister described in Patent Document 1, when the honeycomb adsorbent is inserted into the housing, the honeycomb adsorbent comes into contact with the open end of the opening in the housing, which may cause the honeycomb adsorbent to break.

[0004] One aspect of this disclosure preferably provides a technique that can suppress adsorbent breakage and properly retain the adsorbent when it is inserted into a filter canister.

[0005] One aspect of this disclosure relates to a filter canister that adsorbs and desorbs evaporating fuel generated in a vehicle's fuel tank. The filter canister includes an adsorbent and a cylindrical body. The adsorbent adsorbs the evaporating fuel and forms a block. The cylindrical body has a cylindrical shape and holds the adsorbent with the adsorbent inserted inside. Movement of the adsorbent in a direction orthogonal to the central axis of the cylindrical body is suppressed by abutting a contact surface in the inner wall of the cylindrical body against the side of the inserted adsorbent, wherein the contact surface is at least a portion of the inner wall of the cylindrical body along the length of the central axis. The cylindrical body has an inclined surface in at least a portion of the range from the open end of the opening into which the adsorbent can be inserted to the contact surface, the inclined surface being formed by inclining the inner wall of the cylindrical body towards the central axis of the cylindrical body, starting from the open end of the opening.

[0006] According to the structure described above, the open end of the opening in the cylindrical body where the adsorbent can be inserted is wider than the front end of the insertion side of the adsorbent. Therefore, when the adsorbent is inserted, contact between the adsorbent and the open end of the opening can be suppressed. This prevents adsorbent breakage during insertion. Furthermore, by suppressing adsorbent movement through the contact surface, the filter can properly retain the adsorbent.

[0007] In the aforementioned filter canister, an inclined surface can be formed on at least a portion of the contact surface, and the cross-sectional area of ​​the portion of the cylindrical body with the inclined surface in the direction orthogonal to the central axis decreases from the opening side of the contact surface toward the side of the contact surface opposite to the opening in the length direction of the central axis. According to the structure described above, the opening side portion of the contact surface is wider than the front end of the adsorbent insertion side. Therefore, when the adsorbent is inserted, contact between the adsorbent and the opening side portion of the contact surface can be suppressed. This prevents adsorbent breakage during insertion.

[0008] In the aforementioned filter canister, an inclined surface can be formed over at least a portion of the area between the opening and the end of the contact surface on the opening side. The cross-sectional area of ​​the portion of the cylindrical body with the inclined surface, in a direction orthogonal to the central axis, decreases from the opening side towards the end of the contact surface on the opening side. According to the structure described above, the opening is wider than the front end of the adsorbent insertion side. Therefore, when the adsorbent is inserted, contact between the adsorbent and the opening can be suppressed. This prevents adsorbent breakage during insertion.

[0009] In the aforementioned filter canister, the filter canister may also include a filter with a clogged opening. The filter canister may have a welded section, where the wall forming the opening is welded to the filter. According to the structure described above, movement of the adsorbent toward the filter can be suppressed. This prevents the adsorbent from detaching from the cylindrical body.

[0010] In the aforementioned filter canister, the filter canister may also include an outer casing component that houses the cylindrical body. According to the structure described above, the outer casing component can prevent damage to the cylindrical body.

[0011] In the aforementioned filter canister, the outer casing can directly or indirectly contact the adsorbent, thereby preventing the adsorbent from detaching in the opposite direction of insertion. Based on the structure described above, it is possible to prevent the adsorbent from detaching from the cylindrical body.

[0012] In the aforementioned filter canister, the adsorbent can be an elastically deformable activated carbon block. Due to the structure described above, gaps are less likely to form between the cylindrical body and the adsorbent. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the filter tank of the first embodiment as seen from the side.

[0014] Figure 2 This is a cross-sectional view of the second chamber as seen from the side, and an enlarged cross-sectional view of the second adsorption chamber as seen from the side.

[0015] Figure 3 This is a schematic diagram of inserting the adsorbent into the inner shell.

[0016] Figure 4 The images show a sectional view of the second chamber viewed from the side, and an enlarged sectional view of the second adsorption chamber viewed from the side, within a structure where the cross-sectional area of ​​the inner shell in a direction orthogonal to the central axis is approximately the same.

[0017] Figure 5 This is a cross-sectional view of the filter tank of the second embodiment as seen from the side.

[0018] Figure 6 This is a cross-sectional view of a filter tank without an inner shell, viewed from the side.

[0019] Figure 7 This is a cross-sectional view of a filter tank without an inner shell and filter, viewed from the side.

[0020] Figure 8 This is a cross-sectional view of a filter tank without a filter, viewed from the side.

[0021] Figure 9 This is a cross-sectional view of the opening of the second adsorption chamber facing the filter tank from the side.

[0022] Figure 10A This is an enlarged cross-sectional view of a modified example of the second embodiment, viewed from the side, showing a filter can configured such that the portion between the end of the opening into which the adsorbent can be inserted and the opening side of the contact surface protrudes toward the interior space of the second chamber.

[0023] Figure 10B This is an enlarged cross-sectional view of a modified example of the second embodiment of the filter canister, viewed from the side, and is a view of a filter canister configured such that the portion between the end of the opening where the adsorbent can be inserted and the opening side of the contact surface protrudes outward toward the second chamber.

[0024] Figure 11A This is an enlarged cross-sectional view of a modified filter tank as seen from the side, and a view of a filter tank with its central axis inclined relative to the length direction of the inner shell.

[0025] Figure 11B This is an enlarged cross-sectional view of a modified filter canister as seen from the side, showing a filter canister with an inclined surface formed in the length direction of the inner shell, within a range shorter than the contact surface.

[0026] Figure 11C This is an enlarged cross-sectional view of a modified filter canister as seen from the side, showing a filter canister with an inclined surface formed in the length direction of the inner shell over a range longer than the contact surface.

[0027] Figure 11DThis is an enlarged cross-sectional view of a modified filter canister as seen from the side, and a view of a portion of the filter canister that is not tilted, located between the end of the opening for inserting the adsorbent and the opening side of the contact surface. Detailed Implementation

[0028] Exemplary embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0029] [1. First Embodiment]

[0030] [1-1. Structure]

[0031] Figure 1 The filter canister 1 shown adsorbs and desorbs evaporated fuel generated in the vehicle's fuel tank (not shown). The filter canister 1 includes an outer shell 2, an inner shell 3, and an adsorbent 4.

[0032] The outer shell 2 is a shell with an internal space. The outer shell 2 is made of synthetic resin. However, the material of the outer shell 2 is not limited to this.

[0033] The outer casing 2 includes a filling port 21, a purge port 22, and an atmospheric port 23. These ports are arranged on the same side of the casing in the same direction. The side of the outer casing 2 where the filling port 21, purge port 22, and atmospheric port 23 are located will be referred to as the port side. Furthermore, the outer casing 2 has an opening 64 on the opposite side of the port side. This opening 64 is closed by a cover member 31. The side opposite to the port side (in other words, the side where the cover member 31 is located) will be referred to as the cover side.

[0034] The filling port 21 is connected to the vehicle's fuel tank via a pipe. The filling port 21 is configured to guide the evaporated fuel generated in the fuel tank into the filter canister 1.

[0035] The purge port 22 is connected to the intake manifold (not shown) of the vehicle's engine via a purge valve. The purge port 22 is configured to discharge evaporated fuel from the filter canister 1 and supply the evaporated fuel to the engine.

[0036] Atmospheric vent 23 is connected to the vehicle's fuel inlet (not shown) via a pipe and is open to the atmosphere. Atmospheric vent 23 allows the gas from which evaporated fuel has been removed to be released into the atmosphere. In addition, atmospheric vent 23 desorbs (i.e., purges) the evaporated fuel adsorbed by the filter canister 1 by introducing outside air (i.e., purging air).

[0037] The internal space of the outer shell 2 is divided into a first chamber 25 and a second chamber 26 by a partition 27.

[0038] As an example, the first chamber 25 is generally rectangular or cylindrical. Both the filling port 21 and the purging port 22 are connected to the inlet-side end of the first chamber 25. Furthermore, a filter 32 is disposed at the inlet-side end of the first chamber 25. A filter 33 is disposed at the cover-side end of the first chamber 25. Adsorbent 40 is disposed between the filter 32 and the filter 33. As an example, the adsorbent 40 is an aggregate of multiple particles. The particles are granular activated carbon. The particles are formed by mixing powdered activated carbon with a binder and shaping it into a predetermined form. Alternatively, adsorbents other than granular particles, such as powdered activated carbon, may also be disposed in the first chamber 25.

[0039] Furthermore, the end of the first chamber 25 on the cover side is connected to the connecting passage 34. The connecting passage 34 extends along the cover member 31 and connects the first chamber 25 with the second chamber 26. A perforated plate 36 is disposed between the filter 33 on the cover side of the first chamber 25 and the connecting passage 34. The perforated plate 36 has permeability that allows fuel vapor and purge air to pass through. A helical spring 37 is also disposed between the perforated plate 36 and the cover member 31. The helical spring 37 presses the perforated plate 36 towards the opening side. Inside the filter tank 1, fluid travels back and forth between the first chamber 25 and the second chamber 26 via the connecting passage 34.

[0040] The second chamber 26 has an elongated shape extending from the connecting passage 34 toward the atmospheric opening 23. As an example, the second chamber 26 is generally cuboid or cylindrical. The opening-side end of the second chamber 26 is connected to the atmospheric opening 23. Furthermore, a filter 38 is disposed at the cover-side end of the second chamber 26. A filter 39 is disposed at the opening-side end of the second chamber 26. And, an inner housing 3 is disposed between the filter 39 of the second chamber 26 and the cover member 31. A welded portion 76 is formed at the opening-side end of the inner housing 3. At the welded portion 76, the filter 39 is fixed to the opening-side end of the inner housing 3, for example, by ultrasonic welding.

[0041] Furthermore, a perforated plate 41 is disposed between the filter 38 located on the cover side and the connecting passage 34 in the second chamber 26. The perforated plate 41 is permeable, allowing fuel vapor and purge air to pass through. A coil spring 42 is disposed between the perforated plate 41 and the cover member 31. The coil spring 42 presses the perforated plate 41 towards the opening side.

[0042] The inner shell 3 is housed inside the outer shell 2. The inner shell 3 is cylindrical. More specifically, the inner shell 3 has a cylindrical shape in which the inner diameter is not fixed along the entire length of the central axis 80. The inner diameter near the upper end of the inner shell 3 changes more towards the opening than the other majority of the inner diameter, and the other majority of the inner diameter gradually changes towards the cover. The cross-sectional shape of the inner shell 3 is circular at any position along the length of the central axis 80. That is, the inner shell 3 has the shape of a rotating body centered on the central axis 80. The inner shell 3 is manufactured, for example, by resin molding using a mold. The inner shell 3 is divided by a partition 53 into a first adsorption chamber 51 and a second adsorption chamber 52 arranged in the direction of fluid flow. The partition 53 is integrally formed with the inner shell 3. The partition 53 has vent holes. Thus, inside the inner shell 3, fluid travels back and forth between the first adsorption chamber 51 and the second adsorption chamber 52 via the partition 53. Furthermore, a filter 54 is disposed adjacent to the cover surface of the partition 53. An adsorbent 43 is disposed between the filter 38 and the filter 54, i.e., in the first adsorption chamber 51. The adsorbent 43 may be the same type of adsorbent as the adsorbent 40, or it may be a different type of adsorbent.

[0043] The second adsorption chamber 52 has an inclined surface 93, which is formed by tilting the inner wall surface of the second adsorption chamber 52 towards the central axis 80 of the inner housing 3, starting from the opening end 96 of the opening 62 described later. Thus, the second adsorption chamber 52 is partially conical. More specifically, within a certain range from the opening end of the second adsorption chamber 52, the cross-sectional area of ​​the second adsorption chamber 52 in the direction orthogonal to the central axis 80 of the inner housing 3 decreases towards the cover end of the second adsorption chamber 52. The central axis 80 is a straight line passing through the centroid of the circular cross-section of each part of the inner housing 3. An adsorbent 4 is disposed in the second adsorption chamber 52. The adsorbent 4 is an elastically deformable block of activated carbon. As an example, the adsorbent 4 is a block-shaped aggregate formed by mixing activated carbon into a sponge. The adsorbent 4 is configured to have a shape approximately the same as the conical portion formed in the second adsorption chamber 52. More specifically, the adsorbent 4 is formed in the shape of a frustum cone. The second adsorption chamber 52 retains the adsorbent 4 by inserting it inside.

[0044] like Figure 2As shown, an opening 62 for inserting the adsorbent 4 is formed at the port end of the second adsorption chamber 52. The inner diameter of the opening 62 is larger than the maximum outer diameter of the adsorbent 4. Openings 63 are also formed at the cap ends of the second adsorption chamber 52. The second adsorption chamber 52 has an abutment surface 60. The abutment surface 60 is the inner wall surface of the second adsorption chamber 52, that is, the side surface located on the inner side. The abutment surface 60 abuts against the outer side surface of the inserted adsorbent 4, thereby suppressing the movement of the adsorbent 4 in a direction orthogonal to the central axis 80 of the inner housing 3. Furthermore, the outer housing 2 abuts indirectly against the adsorbent 4, thereby suppressing the adsorbent 4 from detaching in the opposite direction of insertion. In this embodiment, the abutment surface 60 corresponds to an example of an inclined surface.

[0045] Return to Figure 1 To illustrate, buffer spaces 61 are provided at the ends of the second adsorption chamber 52 on the cover side. Adsorbent 4 and adsorbent 43 are not disposed in the buffer spaces 61.

[0046] [1-2. Method for assembling the inner shell onto the outer shell]

[0047] like Figure 3 As shown, firstly, the adsorbent 4 is inserted into the second adsorption chamber 52 of the inner housing 3 through the opening 62 on the port side. The adsorbent 4 is moved parallel to and inserted into the second adsorption chamber 52, relative to the state in which it is held within the second adsorption chamber 52.

[0048] Next, the filter 39 is fixed to the end of the inner housing 3 on the port side by ultrasonic welding.

[0049] Next, the inner housing 3 is inserted into the second chamber 26 of the outer housing 2 through the opening 64 on the cover side of the outer housing 2. The inner housing 3 is assembled into the outer housing 2 in the state of a box filled with adsorbent 4. After assembling the inner housing 3, the cover part 31 of the outer housing 2 is assembled onto the outer housing 2.

[0050] [1-3. Effects]

[0051] According to the first embodiment described in detail above, the following effects can be obtained.

[0052] (1a) The cross-sectional area of ​​the second adsorption chamber 52 in the direction orthogonal to the central axis 80 of the inner housing 3 decreases from the opening end of the second adsorption chamber 52 toward the cover end of the two ends of the second adsorption chamber 52. Here, as Figure 4As shown, assume an inner shell 3a with a constant diameter of the internal space (second adsorption chamber 182) at the port side. If an adsorbent 74 with the same cross-sectional shape as the aforementioned internal space is inserted into the inner shell 3a, the adsorbent 74 may collide with the opening end 96 of the opening on the port side of the inner shell 3a, potentially causing the adsorbent 74 to be lost or broken. However, according to the structure of the first embodiment, the opening end 96 of the opening in the inner shell 3a into which the adsorbent 4 can be inserted is wider than the front end of the insertion side of the adsorbent 4. Therefore, when the adsorbent 4 is inserted, contact between the adsorbent 4 and the opening end 96 of the opening can be suppressed. Thus, the breakage of the adsorbent 4 can be suppressed when it is inserted.

[0053] In addition, such as Figure 4 As shown, suppose the second adsorption chamber 182 is configured without the inclined surface 93, but has a support portion 75 that supports the adsorbent 74 in a manner that prevents the adsorbent 74 from falling towards the cap side end of the second adsorption chamber 182. In this case, the flow of the evaporated fuel may deteriorate near the support portion 75. If the cross-sectional area of ​​the flow path changes abruptly, eddies will occur at the location of the abrupt change in cross-sectional area, thereby hindering smooth flow. However, according to the structure of the first embodiment, compared to the structure with the support portion 75, the evaporated fuel can flow more smoothly along the inclined surface 93. Therefore, the flow of the evaporated fuel can be improved.

[0054] (1b) The filter 39 is fixed to the end of the inner housing 3 on the port side by ultrasonic welding. This structure suppresses the movement of the adsorbent 4 toward the filter 39. Therefore, it is possible to prevent the adsorbent 4 from detaching from the inner housing 3. Furthermore, it can work in conjunction with the effect described later in (1d) to suppress the adsorbent 4 from detaching from the inner housing 3.

[0055] (1c) In the filter tank 1, the inner shell 3 is housed inside the outer shell 2. With this structure, the outer shell 2 can prevent the inner shell 3 from breaking.

[0056] (1d) The outer shell 2 indirectly abuts against the adsorbent 4, thereby preventing the adsorbent 4 from detaching in the opposite direction of the insertion direction. According to this structure, it is possible to prevent the adsorbent 4 from detaching from the inner shell 3.

[0057] (1e) The adsorbent 4 is an activated carbon block capable of elastic deformation. Based on this structure, the adsorbent 4 can be disposed within the inner shell 3 without creating gaps. Therefore, leakage of evaporated fuel from between the inner shell 3 and the adsorbent 4 can be suppressed.

[0058] [1-4. Correspondence]

[0059] In this embodiment, the inner shell 3 is an example of a cylindrical body, and the outer shell 2 is an example of an outer shell component.

[0060] [2. Second Implementation]

[0061] Figure 5 The basic structure of the second embodiment shown is the same as that of the first embodiment; the differences will be explained below. Furthermore, the same symbols as in the first embodiment denote the same constituent elements, as explained above.

[0062] In the first embodiment, the filter canister 1 includes an inner shell 3. While... Figure 5 In the second embodiment shown, the filter canister 101 does not have an inner shell 3. Adsorbent 140 is inserted through the opening 64 on the cover side of the second chamber 126, and the adsorbent 140 is disposed inside the cylindrical body 71 formed near the atmospheric vent 23 in the filter canister 101. The cylindrical body 71 has a straight tube portion 72 with a circular cross-section, and a tapered portion 73 disposed closer to the cover side than the straight tube portion 72. The cover side of the tapered portion 73 is an opening 65 for inserting the adsorbent 140. The inner wall surface of the tapered portion 73 is an inclined surface 95, and the cross-sectional area of ​​the portion forming the inclined surface 95 in the direction orthogonal to the central axis 81 of the straight tube portion 72 decreases from the opening 65 side towards the end 66 located on the opening 65 side of the contact surface 60. The central axis 81 mentioned here is a straight line passing through the centroid of the circular cross-section of each portion of the straight tube portion 72. An inclined surface 95 is formed between the opening 65 into which the adsorbent 140 is inserted and the end 66 of the contact surface 60 located on the side of the opening 65. The inclined surface 95 is formed in a conical shape.

[0063] [2-2. Effect]

[0064] According to the second embodiment described above, in addition to obtaining the effects of the first embodiment, the following effects can also be obtained.

[0065] (2a) The cross-sectional area of ​​the portion with the inclined surface 95 in the direction orthogonal to the central axis 81 of the straight tube portion 72 decreases from the opening 65 side toward the end 66 located on the opening 65 side of the contact surface 60. According to this structure, the opening end 97 of the opening 65 into which the adsorbent 140 can be inserted is wider than the front end of the adsorbent 140 on the insertion side. Therefore, when the adsorbent 140 is inserted, contact between the adsorbent 140 and the opening end 97 of the opening 65 can be suppressed. This prevents the adsorbent 140 from breaking during insertion.

[0066] [2-3. Correspondence]

[0067] In this embodiment, the cylinder 71 is an example of a cylindrical body.

[0068] [3. Other Implementation Methods]

[0069] The embodiments of this disclosure have been described above. However, this disclosure is not limited to the above embodiments, and various embodiments can be adopted.

[0070] (3a) In the second embodiment described above, a structure having a straight tube portion 72 and a tapered portion 73 is illustrated. However, as Figure 6 As shown, the end of the second chamber 226 in the filter tank 201 on the inlet side can also be formed in a conical shape. In other words, a cylindrical portion 91 can be formed at the end of the second chamber 226 on the inlet side, wherein the cylindrical portion 91 forms a frustoconical space for disposing of the adsorbent 4, and the cross-sectional area of ​​the cylindrical portion 91 at the plane orthogonal to the central axis 82 can decrease towards the end on the inlet side. The central axis 82 mentioned here is the central axis of the frustoconical space formed by the cylindrical portion 91 and passes through the centroid of the cross section of the space. The adsorbent 4 is sandwiched between filters 211 and 212. In this modified example, the cylindrical portion 91 corresponds to an example of a cylindrical body.

[0071] In addition, such as Figure 7 As shown, the filter canister 301 may not have a filter 211. In this case, the adsorbent 4 can also be supported by the adsorbent 43 filled with the second chamber 226 so that it does not fall towards the cover side.

[0072] In addition, such as Figure 8 As shown, when the filter tank 401 has an inner shell 403, the filter may not be provided on the cover side of the adsorbent 4.

[0073] (3b) In the first embodiment described above, an example is shown where the opening of the second adsorption chamber 52 for inserting the adsorbent 4 is opened in such a way that fluid flows parallel from the cover side to the opening side. However, as Figure 9 As shown, the opening of the second adsorption chamber 552 for inserting the adsorbent 4 can also be opened in a cross-direction, allowing fluid to flow in a direction perpendicular to the direction from the cover side to the opening side. In other words, a cylindrical portion 92 can be formed at the end of the second chamber 26 on the opening side. The cylindrical portion 92 has a length in the aforementioned cross-direction and forms a frustum-shaped space for disposing of the adsorbent 4. Furthermore, the cross-sectional area of ​​the cylindrical portion 92 at the plane orthogonal to the central axis 83 decreases from the opening towards the interior of the inner housing 3 in the aforementioned cross-direction. The central axis 83 mentioned here is the central axis of the frustum-shaped space formed by the cylindrical portion 92 and passes through the center of gravity of the cross section of the space. In this modified example, the cylindrical portion 92 corresponds to an example of a cylindrical body.

[0074] (3c) In the second embodiment described above, an inclined surface 95 is shown to be formed in a conical shape, and the cross-sectional shape of the inclined surface 95 is linear. However, the cross-sectional shape of the inclined surface may not be linear. For example... Figure 10A As shown, the portion between the opening 65 into which the adsorbent 140 can be inserted and the end of the abutment surface 60 on the side of the opening 65 can also be configured to protrude toward the interior space of the second chamber 126. Furthermore, for example... Figure 10B As shown, the portion between the opening 65 into which the adsorbent 140 can be inserted and the end of the abutment surface 60 on the side of the opening 65 can also be configured to protrude toward the outside of the second chamber 126.

[0075] (3d) In the first embodiment described above, a structure in which an inclined surface 93 is formed on the entire surface of the abutment surface 60 is illustrated. Furthermore, in the second embodiment described above, a structure in which an inclined surface 95 is formed on the entire surface of the portion between the opening 65 into which the adsorbent 140 can be inserted and the end of the abutment surface 60 on the side of the opening 65 is shown. However, the range of the inclined surface is not limited to this. An inclined surface can be formed on at least a portion of the range from the opening end of the opening into which the adsorbent can be inserted to the abutment surface. At least a portion of the range from the opening end to the abutment surface refers to at least a portion of the range encompassing the entire area of ​​the abutment surface from the opening end. In other words, at least a portion of the range from the opening end to the abutment surface refers to at least a portion of the range from the opening end to the end of the abutment surface located on the opposite side of the opening. As a variation of the first embodiment, such as... Figures 11A to 11C As shown, an inclined surface may be formed on at least a portion of the contact surface 60. Figure 11A As shown, a portion of the contact surface 60 may not be inclined. Furthermore, the central axis 84 may also be inclined relative to the length direction of the inner housing 3. The central axis 84 may be a straight line passing through the centroid of the cross-section of the main body portion through which the adsorbent 4 is disposed. Furthermore, as... Figure 11B As shown, an inclined surface can be formed along the length of the inner housing 3, in a range shorter than the abutment surface 60. Furthermore, as... Figure 11C As shown, an inclined surface can be formed in the length direction of the inner shell 3, in a range longer than the abutment surface 60.

[0076] Furthermore, as a variation of the second embodiment, such as Figure 11D As shown, an inclined surface may also be formed on at least a portion of the area between the opening 65 of the adsorbent insertion 140 and the end of the contact surface 60 located on the opening 65 side. Alternatively, a portion of the area between the opening 65 of the adsorbent insertion 140 and the end of the contact surface 60 located on the opening 65 side may not be inclined.

[0077] (3e) In the above embodiment, the adsorbent 4 is exemplified as an elastically deformable activated carbon block. However, the structure of the adsorbent 4 is not limited to this. For example, the adsorbent may not be elastically deformable, as long as no gaps are generated between the inner shells 3, and the adsorbent is not limited to activated carbon. In addition, the adsorbent may also have a honeycomb structure.

[0078] (3f) In the first embodiment described above, an example is shown where the outer shell 2 indirectly abuts against the adsorbent 4, thereby suppressing the adsorbent 4 from detaching in the opposite direction of the insertion direction. However, the outer shell 2 may also directly abut against the adsorbent 4, thereby suppressing the adsorbent 4 from detaching in the opposite direction of the insertion direction.

[0079] (3g) In the above embodiment, a structure is illustrated in which the filling port 21, the purging port 22, and the atmospheric port 23 are arranged on the same side of the housing in the same direction. However, the orientation of these ports is not limited to this. For example, any port may be arranged in a direction orthogonal to the other ports. Furthermore, for example, any port may be arranged on the side of the housing opposite to the other ports.

[0080] (3h) In the first embodiment described above, an example is shown where the inner shell 3 is cylindrical and the cross-sectional shape of the inner shell 3 is circular. Furthermore, the adsorbent 4 is formed in the shape of a frustum cone. However, the shape of the inner shell 3 is not limited to this. And the shape of the adsorbent 4 is also not limited to this. For example, the inner shell may be polygonal, and the adsorbent may be pyramidal or frustum-shaped.

[0081] Furthermore, in the second embodiment described above, a structure in which the cross-section of the straight tube 72 is circular is illustrated. However, the shape of the straight tube 72 is not limited to this. For example, the straight tube may also be polygonal.

[0082] (3i) One or more functions of one constituent element in the above embodiments can be shared by multiple constituent elements, or one or more functions of multiple constituent elements can be integrated into one constituent element. Furthermore, a portion of the configuration of the above embodiments can be omitted. In addition, at least a portion of the configuration of the above embodiments can be added to the configuration of the other embodiments, or at least a portion of the configuration of the above embodiments can be substituted with the configuration of the other embodiments, etc.

Claims

1. A filter canister for adsorbing and desorbing evaporated fuel generated in a vehicle's fuel tank, characterized in that it comprises: An adsorbent adsorbs the evaporated fuel and forms a block; A cylindrical body having a cylindrical shape and retaining the adsorbent with the adsorbent inserted inside; and An atmospheric vent, which opens to the atmosphere, By making the contact surface on the inner wall of the cylindrical body abut against the side of the inserted adsorbent, the movement of the adsorbent in a direction orthogonal to the central axis of the cylindrical body is suppressed. The contact surface is at least a portion of the inner wall surface of the cylindrical body along the length direction of the central axis. The cylindrical body has an inclined surface over at least a portion of the range from the open end of the opening into which the adsorbent can be inserted to the contact surface. The inclined surface is formed by tilting the inner wall surface of the cylindrical body in a direction close to the central axis of the cylindrical body, starting from the open end of the opening. The opening is formed at the end of the cylindrical body on the atmospheric port side. The cross-sectional area of ​​the inclined surface in the direction orthogonal to the central axis decreases as it moves from the opening side toward the opposite side of the opening.

2. The filter tank according to claim 1, characterized in that, The inclined surface is formed over at least a portion of the abutment surface, and the cross-sectional area of ​​the portion of the cylindrical body in which the inclined surface is formed, in a direction orthogonal to the central axis, decreases from the opening side of the abutment surface toward the side of the abutment surface opposite to the opening in the length direction of the central axis.

3. The filter tank according to claim 1, characterized in that, The inclined surface is formed over at least a portion of the area between the opening and the end of the abutment surface on the opening side, and the cross-sectional area of ​​the portion of the cylindrical body in which the inclined surface is formed decreases from the opening side toward the end of the abutment surface on the opening side in a direction orthogonal to the central axis.

4. The filter tank according to any one of claims 1 to 3, characterized in that, It also includes a filter that seals the opening. The filter canister has a welded section, where the wall forming the opening is welded to the filter.

5. The filter tank according to any one of claims 1 to 3, characterized in that, It also includes an outer casing component that houses the cylindrical body.

6. The filter tank according to claim 5, characterized in that, The outer shell component comes into direct or indirect contact with the adsorbent, thereby preventing the adsorbent from detaching in the opposite direction to the insertion direction.

7. The filter tank according to any one of claims 1 to 3, characterized in that, The adsorbent is an activated carbon block that can be elastically deformed.

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