Patent Publication Number: US-2023151781-A1

Title: Canister

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of Japanese Patent Application No. 2021-185793 filed on Nov. 15, 2021 with the Japan Patent Office, the entire disclosure of which is incorporated herein by reference. 
     BACKGROUND 
     The present disclosure relates to a canister for adsorbing fuel vapor generated in a fuel tank. 
     A canister disclosed in Japanese Unexamined Patent Application Publication No. 2018-96254 is provided with an object chamber in which an adjusting member is arranged that comprises a plurality of rod-shaped portions and a coupling member to couple together bases of the rod-shaped portions. The rod-shaped portions extend substantially parallel to a gas flow direction, and are arranged with spacing therebetween, throughout the object chamber. This leads to generation of gaps between activated carbon pellets, as a granular adsorbent, arranged in the object chamber and the respective rod-shaped portions, resulting in reducing the ventilation resistance of the object chamber. 
     Here, it is conceivable that the adjusting member is manufactured from resin by injection molding. To carry out the injection molding, it is necessary to form a draft on an outer peripheral surface of each rod-shaped portion so that the adjusting member can be taken out of a die. The draft is formed by inclining the outer peripheral surface of each rod-shaped portion so that it becomes thinner with increasing distance from the coupling member. 
     SUMMARY 
     However, in a case where the rod-shaped portions are long, the base of each rod-shaped portion needs to be made thicker in forming the draft. This makes it likely that accumulation of heat occurs around the base of the rod-shaped portion when carrying out the injection molding. 
     In general, a die for injection molding has a cooling pipe arranged therein that allows a refrigerant for cooling a molded member to flow. In the die for the adjusting member, however, although a cooling pipe can be arranged around the adjusting member, it is difficult to arrange a cooling pipe so as to pass through between the rod-shaped portions because the space between the rod-shaped portions of the adjusting member is small. 
     Thus, a part around the base of each rod-shaped portion made thicker due to the draft is less likely to be cooled than other parts. This results in occurrence of non-uniform temperature around the base of the rod-shaped portion, thus generating a slant (hereinafter also referred to as a warpage) in the rod-shaped portion. Accordingly, in the case where the rod-shaped portions are long, manufacture of the adjusting member has been difficult. 
     In one aspect of the present disclosure, it is desirable to facilitate manufacture of a canister. 
     One aspect of the present disclosure is a canister configured to be mounted in a vehicle with an engine. The canister comprises at least one chamber, an inflow port, an atmosphere port, an outflow port, and a resin member. In the at least one chamber, an adsorbent to adsorb fuel vapor is arranged. The inflow port is configured to allow the fuel vapor to flow into the at least one chamber from a fuel tank of the vehicle. The atmosphere port is configured to allow atmospheric air to flow into the at least one chamber from outside of the vehicle. The outflow port is configured to allow the fuel vapor adsorbed on the adsorbent to flow out toward the engine by means of the atmospheric air flowing in from the atmosphere port. The resin member is arranged in an object chamber, which is any of the at least one chamber. The adsorbent arranged in the object chamber is formed as a plurality of granular bodies. The resin member is an integrally formed member of resin, and comprises a coupling member and at least one rod-shaped unit. The at least one rod-shaped unit comprises a plurality of rod-shaped portions extending from the coupling member in an extending direction substantially parallel to a direction intersecting a gas flow direction in the object chamber at an angle of 45° or more and 90° or less. 
     This configuration can facilitate shortening of the length of the rod-shaped portions while arranging the rod-shaped portions throughout the object chamber, thus inhibiting the base of each rod-shaped portion from being thicker due to formation of the draft. Accordingly, occurrence of a warpage in the rod-shaped portion can be inhibited when carrying out injection molding for the resin member, resulting in facilitating manufacture of the canister. 
     In one aspect of the present disclosure, the object chamber may have an elongated shape extending in the gas flow direction in the object chamber. 
     This configuration can further facilitate shortening of the length of the rod-shaped portions, thus inhibiting the base of each rod-shaped portion from being thicker due to formation of the draft. Accordingly, occurrence of a warpage in the rod-shaped portion can be further inhibited when carrying out injection molding for the resin member. 
     In one aspect of the present disclosure, at least a part of the plurality of rod-shaped portions may have, on an outer peripheral surface thereof, at least one recess formed. 
     In this configuration, gaps are formed between the at least one recess formed on the rod-shaped portion and the adsorbent as the plurality of granular bodies. This enables reduction of the ventilation resistance of the canister. 
     In one aspect of the present disclosure, the resin member may comprise, as the at least one rod-shaped unit, a first rod-shaped unit and a second rod-shaped unit. The coupling member may comprise a first portion and a second portion. The second portion is positioned on a side opposite to the first portion. The plurality of rod-shaped portions in the first rod-shaped unit may extend, from the first portion, substantially parallel to a direction determined according to the first rod-shaped unit. The plurality of rod-shaped portions in the second rod-shaped unit may extend, from the second portion, substantially parallel to a direction determined according to the second rod-shaped unit. 
     This configuration makes it possible, when carrying out injection molding, to form the first and second rod-shaped units by means of different dies positioned on each side of the coupling member. Also, the rod-shaped portions in each of the first and second rod-shaped units extend in different extending directions from the coupling member positioned between these rod-shaped units. This can further facilitate shortening of the length of the rod-shaped portions in each rod-shaped unit while arranging the rod-shaped portions throughout the object chamber. Accordingly, occurrence of a warpage in the rod-shaped portion can be further inhibited when carrying out injection molding for the resin member. 
     In one aspect of the present disclosure, the first rod-shaped unit and the second rod-shaped unit may have a substantially identical shape. 
     This configuration simplifies the configuration of the resin member, thus facilitating manufacture of the resin member. 
     In one aspect of the present disclosure, the resin member may have a substantially plane-symmetrical shape with respect to a plane passing through the coupling member. 
     This configuration simplifies the configuration of the resin member, thus facilitating manufacture of the resin member. 
     In one aspect of the present disclosure, the extending direction of the plurality of rod-shaped portions may be a direction intersecting the gas flow direction in the object chamber at an angle of approximately 90°. 
     This configuration can further facilitate shortening of the length of the rod-shaped portions, thus inhibiting the base of each rod-shaped portion from being thicker due to formation of the draft. Accordingly, occurrence of a warpage in the rod-shaped portion can be further inhibited when carrying out injection molding for the resin member. 
     In one aspect of the present disclosure, both ends of the resin member in the gas flow direction may be positioned near an inner wall of the object chamber. 
     This configuration enables reduction of the ventilation resistance of the canister as the resin member is arranged from a first end through a second end of the object chamber in the gas flow direction. 
     In one aspect of the present disclosure, the coupling member may extend in the gas flow direction. 
     This configuration makes it possible to arrange the rod-shaped portions in the object chamber in a preferred manner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Example embodiments of the present disclosure will be described below with reference to the accompanying drawings, in which: 
         FIG.  1    is a sectional view of a canister as viewed from its side; 
         FIG.  2    is a front view of a resin member; 
         FIG.  3    is a side view of the resin member; 
         FIG.  4    is a bottom view of the resin member as viewed from a first end side; 
         FIG.  5    is a sectional view of a first rod-shaped portion  51  having recesses formed thereon; 
         FIG.  6    is a sectional view of the first rod-shaped portion  51  having the recesses formed thereon; 
         FIG.  7    is an explanatory diagram as to injection molding of the resin member; 
         FIG.  8    is a front view of a resin member of a modified example; and 
         FIG.  9    is a front view of a resin member of a modified example. 
     
    
    
     DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Embodiments of the present disclosure are not limited to the embodiments below, and may take various forms as long as they belong to the technical scope of the present disclosure. 
     [Configuration of Canister] 
     A canister  1  of a first embodiment (see  FIG.  1   ) is mounted in a vehicle. The vehicle in which the canister  1  is mounted will be hereinafter referred to as the vehicle concerned. The canister  1  comprises a container  10  of synthetic resin. The container  10  comprises a first chamber  20 , a second chamber  30 , and a third chamber  40 . Arranged respectively in the first chamber  20 , the second chamber  30 , and the third chamber  40  are adsorbents  60 ,  61 , and  62  for adsorbing fuel vapor. The number of chambers in the canister  1  may be, for example, two or less, or four or more. 
     The adsorbent  61  in the second chamber  30  is formed as pellets, which are granular activated carbon. The adsorbent  61  in the second chamber  30  may be formed as a granular adsorbent other than the pellets. The absorbent  60  in the first chamber  20  and the absorbent  62  in the third chamber  40  may be formed as, for example, powdered activated carbon, or may be formed as pellets. The adsorbent  62  in the third chamber  40  may be formed as a honeycomb carbon block, as an example. The honeycomb carbon block comprises a side wall having a cylindrical shape, and is arranged in the third chamber  40  so as to extend in a gas flow direction. Provided inside the side wall are a plurality of flow paths passing through the honeycomb carbon block in its extending direction. The adsorbents  60 ,  61 , and  62  respectively arranged in the first chamber  20 , the second chamber  30 , and the third chamber  40  may be formed of a material other than the activated carbon. 
     Provided at an end of the container  10  are an inflow port  11 , an outflow port  12 , and an atmosphere port  13 . The inflow port  11  and the outflow port  12  allow for communication between the inside of the first chamber  20  and the outside of the container  10 . The atmosphere port  13  allows for communication between the inside of the third chamber  40  and the outside of the container  10 . 
     Hereinafter, a side of the container  10  of the canister  1  where the inflow port  11 , the outflow port  12 , and the atmosphere port  13  are arranged is referred to as a port side. The container  10  includes an opening on a side opposite to the port side. The opening is closed by a lid member  14 . Hereinafter, the side opposite to the port side (i.e., a side where the lid member  14  is arranged) is referred to as a lid side. 
     The inflow port  11  is connected to a fuel tank for an engine of the vehicle concerned. The fuel vapor generated in the fuel tank flows into the canister  1  via the inflow port  11 , and is adsorbed on the adsorbents  60 ,  61 , and  62  in the respective chambers. In this way, the fuel is accumulated inside the canister  1 . 
     The outflow port  12  is connected to an intake pipe of the engine of the vehicle concerned, and the atmosphere port  13  communicates with the outside of the vehicle concerned. The negative intake air pressure of the engine causes atmospheric air (i.e., purge air) to flow into the canister  1  via the atmosphere port  13 . Such inflow of the purge air causes the fuel adsorbed on the adsorbents  60 ,  61 , and  62  to be desorbed, and the desorbed fuel flows out together with the purge air from the outflow port  12  toward the intake pipe. In this way, a purging to remove the fuel adsorbed on the adsorbents  60 ,  61 , and  62  is carried out, and the adsorbents  60 ,  61 , and  62  are recovered. 
     In other words, the fuel vapor flowing in from the inflow port  11 , the fuel vapor flowing out from the outflow port  12  during the purging, and the purge air flowing in from the atmosphere port  13  during the purging, flow in the chambers  20 ,  30 , and  40  along a direction in which an end on the port side and an end on the lid side face each other. 
     As an example, the first chamber  20  has a substantially rectangular parallelepiped shape. The first chamber  20  has an elongated shape extending from the lid side to the port side, and its port side end is connected to the inflow port  11  and to the outflow port  12 . There are provided filters  21  and  22 , respectively, on the port side end and a lid side end of the first chamber  20 , and the adsorbent  60  is arranged between the filters  21  and  22 . 
     The first chamber  20  communicates, on its lid side end, with a communicating passage  15 . The communicating passage  15  is arranged along the lid member  14 , thus interconnecting the first chamber  20  and the second chamber  30 . There is provided a porous plate  23  with permeability between the filter  22  on the lid side of the first chamber  20  and the communicating passage  15 , and a coil spring  16  is provided between the porous plate  23  and the lid member  14 . The coil spring  16  presses the porous plate  23  toward the port side. This allows fluid to flow to and fro between the first chamber  20  and the second chamber  30  via the communicating passage  15 , in the inside of the canister  1 . 
     The second chamber  30  and the third chamber  40  are adjacent to the first chamber  20 , and each have an elongated shape extending from the lid side to the port side. As an example, L/D of the second chamber  30  and/or the third chamber  40  may be greater than 1. L means the length of the chamber in a gas flow direction, and D means an equivalent diameter of a cross section of the chamber perpendicular to the gas flow direction. The second chamber  30  and the third chamber  40  are arranged from the lid side to the port side, with their ends adjacent to each other. The second chamber  30  and the third chamber  40  are separated by a partition member  18  with permeability having a plate shape. This allows fluid to pass through the partition member  18  and flow to and fro between the inner space of the second chamber  30  and the inner space of the third chamber  40 . 
     There is provided a filter  31  on a lid side end of the second chamber  30 , and the adsorbent  61  is arranged between the filter  31  and the partition member  18 . Further, there is provided a filter  41  on a port side end of the third chamber  40 , and the adsorbent  62  is arranged between the filter  41  and the partition member  18 . 
     There is provided a porous plate  32  with permeability between the filter  31  on the lid side of the second chamber  30  and the communicating passage  15 , and a coil spring  17  is provided between the porous plate  32  and the lid member  14 . The coil spring  17  presses the porous plate  32  toward the port side. The port side end of the third chamber  40  is connected to the atmosphere port  13 . 
     [Resin Member] 
     In the present embodiment, as an example, the second chamber  30  is configured as an object chamber, and a resin member  5  is provided in the second chamber  30  (see  FIG.  1   ). The first chamber  20  or the third chamber  40  may be configured as the object chamber in which the resin member  5  is arranged, or two or more of the first chamber  20 , the second chamber  30 , and the third chamber  40  may be configured as the object chambers. In the object chamber, a granular adsorbent, such as pellets, is arranged. 
     The resin member  5  is arranged in the second chamber  30  such that a first end  5 A is positioned on the port side and a second end  5 B is positioned on the lid side (see  FIGS.  2  through  4   ). The first end  5 A of the resin member  5  is positioned close to an inner wall of the object chamber located at a port side end thereof, and the second end  5 B is positioned close to an inner wall of the object chamber located at a lid side end thereof. On the contrary, however, the resin member  5  may be arranged in the second chamber  30  such that the second end  5 B is positioned on the port side and the first end  5 A is positioned on the lid side. 
     The resin member  5  is formed of a resin into one piece, and comprises first and second rod-shaped units  50  and  52 , and a coupling member  54 . 
     [First and Second Rod-Shaped Units] 
     The first rod-shaped unit  50  comprises a plurality of first rod-shaped portions  51  (see  FIGS.  2  through  4   ). The first rod-shaped portions  51  are elongated portions extending so as to be substantially parallel to each other with spaces therebetween and having the lengths substantially identical to each other. Each first rod-shaped portion  51  extends in a first extending direction  51 A from a first portion  54 A of the coupling member  54 . Each first rod-shaped portion  51  has a draft formed thereon, and becomes thinner with increasing distance toward its tip. Each first rod-shaped portion  51  is formed such that, as an example, its cross section perpendicular to its extending direction (hereinafter simply referred to as the cross section) is substantially circular. However, the shape of the cross section may be determined as appropriate. 
     The second rod-shaped unit  52  also comprises a plurality of second rod-shaped portions  53  configured similarly to the plurality of first rod-shaped portions  51 . The second rod-shaped portions  53  have the lengths substantially identical to those of the first rod-shaped portions  51 . Each second rod-shaped portion  53  extends in a second extending direction  53 A from a second portion  54 B of the coupling member  54  opposite to the first portion  54 A. 
     As an example, the first and second extending directions  51 A and  53 A intersect gas flow directions  5 C in the second chamber  30  at an angle of approximately 90°, and the first extending direction  51 A is opposite to the second extending direction  53 A. A base of each first rod-shaped portion  51  is adjacent to a base of a corresponding second rod-shaped portion  53 , and the first rod-shaped portion  51  and the corresponding second rod-shaped portion  53  whose base is adjacent to that of the first rod-shaped portion  51  extend substantially in a straight line with the coupling member  54  therebetween. 
     In other words, the first rod-shaped unit  50  and the second rod-shaped unit  52  have a substantially identical shape, and the resin member  5  has a substantially plane-symmetrical shape with a plane passing through the coupling member  54  as its center. 
     The first and second rod-shaped portions  51  and  53  are arranged, as an example, so as to form a first row  5 D, a second row  5 E, and a third row  5 F, and are arranged throughout the second chamber  30 . The number of the rows of the first and second rod-shaped portions  51  and  53 , and the number of the first and second rod-shaped portions  51  and  53  arranged in each row may be determined as appropriate according to the size of the chamber in which the resin member  5  is arranged. 
     The adsorbent  61  arranged in the second chamber  30  is formed as granular pellets. Thus, by arranging the first and second rod-shaped portions  51  and  53  (hereinafter also referred to simply as the rod-shaped portions) in the second chamber  30 , gaps are formed between the respective rod-shaped portions and the adsorbent  61 . This results in reducing the ventilation resistance of the second chamber  30 . 
     [Coupling Member] 
     The coupling member  54  is arranged from the first end  5 A through the second end  5 B of the resin member  5 , and extends along the gas flow directions  5 C in the second chamber  30  (see  FIGS.  2  through  4   ). The coupling member  54  is positioned substantially in the middle of the resin member  5  with respect to the first and second extending directions  51 A and  53 A, and couples the bases of the first rod-shaped portions  51  and the bases of the second rod-shaped portions  53  to each other. It is to be appreciated that, in the resin member  5  of the present embodiment, the rod-shaped portions  51  and  53  are coupled to each other by the coupling member  54 , as an example, and are not coupled to each other by other elements. The coupling member  54  comprises a body portion  55 , a plurality of first branch portions  56 , a plurality of second branch portions  57 , and two flat portions  58  (see  FIGS.  3  and  4   ). 
     The body portion  55  is a rod-shaped portion extending substantially linearly along the gas flow directions  5 C. The body portion  55  couples the bases of the first rod-shaped portions  51  and the bases of the corresponding second rod-shaped portions  53  in the second row  5 E to each other. 
     The first branch portions  56  are each arranged so as to protrude toward the first row  5 D from the base of the corresponding rod-shaped portion in the second row  5 E. Each first branch portion  56  couples the base of the corresponding rod-shaped portion in the second row  5 E to the base of the rod-shaped portion in the first row  5 D positioned on the side of the second end  5 B with respect to such rod-shaped portion and closest to such rod-shaped portion. 
     The second branch portions  57  are each arranged so as to protrude toward the third row  5 F from the base of the corresponding rod-shaped portion in the second row  5 E. Each second branch portion  57  couples the base of the corresponding rod-shaped portion in the second row  5 E to the base of the rod-shaped portion in the third row  5 F positioned on the side of the second end  5 B with respect to such rod-shaped portion and closest to such rod-shaped portion. 
     The flat portions  58  are each arranged in the first row  5 D and in the third row  5 F. The flat portion  58  in the first row  5 D couples the bases of three rod-shaped portions arranged from the first end  5 A in the first row  5 D to each other. Also, the flat portion  58  in the third row  5 F couples the bases of three rod-shaped portions arranged from the first end  5 A in the third row  5 F to each other. 
     Each flat portion  58  has a flat shape substantially parallel to the gas flow directions  5 C and extending so as to be substantially orthogonal to the first and second extending directions  51 A and  53 A, and protrudes toward the inner wall of the second chamber  30  to abut the inner wall. This results in forming gaps between the inner wall of the second chamber  30  and the rod-shaped portions in the first row  5 D and in the third row  5 F. 
     [Recess] 
     At least a part of the rod-shaped portions in the first rod-shaped unit  50  and/or the second rod-shaped unit  52  may have a recess  59  formed on its outer peripheral surface (see  FIGS.  5  and  6   ). Specifically, for example, the recess  59  may be formed as a groove-shaped portion extending substantially parallel to the extending direction of the rod-shaped portion from the base thereof or its vicinity to the tip thereof or its vicinity. As an example, the recess  59  may be provided four in number with substantially equal spacing, to thereby form the cross section of the rod-shaped portion in an X-like shape (see  FIG.  5   ). Alternatively, for example, the recess  59  may be provided five in number with substantially equal spacing, to thereby form the cross section of the rod-shaped portion in a star-like shape (see  FIG.  6   ). 
     Obviously, the recess  59  may be formed as a groove-shaped portion extending in a direction different from the extending direction, without being limited to the above. Further, the recess  59  is not limited to the groove-shaped portion and, for example, may be formed on a dot-shaped area on the outer peripheral surface of the rod-shaped portion. 
     The rod-shaped portions in the first rod-shaped unit  50  and/or the second rod-shaped unit  52  may comprise rod-shaped portions of two or more types differing in the shape of the cross section, or may comprise at least one particular rod-shaped portion. The at least one particular rod-shaped portion comprises two or more segments arranged along the extending direction of the at least one particular rod-shaped portion and differing in the shape of the cross section. 
     [Manufacturing Method of Resin Member] 
     The resin member  5  is manufactured by injection molding using first and second dies  7 A and  7 B (see  FIG.  7   ). The first die  7 A is configured to form the first rod-shaped unit  50  (i.e., the first rod-shaped portions  51 ) and the first portion  54 A of the coupling member  54 . The second die  7 B is configured to form the second rod-shaped unit  52  (i.e., the second rod-shaped portions  53 ) and the second portion  54 B of the coupling member  54 . 
     The first die  7 A comprises a recessed portion  70 , a plurality of holes  71 , a contact surface  72 , and a cooling pipe  73 . 
     The recessed portion  70  is a portion for forming the first portion  54 A of the coupling member  54 , and is arranged on the contact surface  72 . 
     The holes  71  are cylindrically-shaped portions for forming the first rod-shaped portions  51 , and are arranged at the bottom of the recessed portion  70 . To form a draft on each first rod-shaped portion  51 , the diameter of each hole  71  becomes smaller with increasing distance toward the bottom side of the hole  71 . 
     The cooling pipe  73  is a portion for allowing a coolant for cooling a resin filling the recessed portion  70  and the holes  71  to flow when carrying out injection molding. The cooling pipe  73  is arranged so as to pass around the first rod-shaped portions  51 . However, the cooling pipe  73  does not pass between the respective first rod-shaped portions  51 . 
     The second die  7 B has a configuration similar to that of the first die  7 A, and comprises the recessed portion  70 , the plurality of holes  71 , the contact surface  72 , and the cooling pipe  73 . 
     When manufacturing the resin member  5 , the first and second dies  7 A and  7 B are arranged such that the contact surfaces  72  are in contact with each other. At this time, the recessed portion  70  and the holes  71  in the first die  7 A, and the recessed portion  70  and the holes  71  in the second die  7 B are substantially plane-symmetrical with respect to the contact surfaces  72 . 
     Next, a space formed by the recessed portions  70  and the holes  71  in the first and second dies  7 A and  7 B is filled with a high-temperature resin. Then, the resin filling the space is cooled by flowing the coolant through the cooling pipe  73 , whereby the resin is cured. 
     Upon completion of the curing of the resin, the first die  7 A and the second die  7 B are separated from each other, and the resin member  5  is taken out from the inside of the first and second dies  7 A and  7 B. 
     A configuration may be employed in which the first die  7 A is configured with a plurality of dies and the first rod-shaped unit  50  and the first portion  54 A of the coupling member  54  are formed by the plurality of dies when carrying out injection molding. Similarly, the second die  7 B may also be configured with a plurality of dies. 
     MODIFIED EXAMPLES 
     In the present embodiment, an angle at which the first extending direction  51 A of the first rod-shaped portions  51  intersects the gas flow directions  5 C (hereinafter referred to as a first intersection angle) is approximately 90°. Similarly, an angle at which the second extending direction  53 A of the second rod-shaped portions  53  intersects the gas flow directions  5 C (hereinafter referred to as a second intersection angle) is also approximately 90° (see  FIG.  2   ). 
     However, the first and second intersection angles are not limited to approximately 90°, and may be determined in a range of 45° or more and 90° or less. Moreover, as shown in  FIG.  8   , the tips of the first and second rod-shaped portions  51  and  53  may be positioned on the side of the second end  5 B with respect to the bases of such first and second rod-shaped portions  51  and  53 , or may be positioned on the side of the first end  5 A, as shown in  FIG.  9   . In either case, the first and second intersection angles are not limited to approximately 90°, and may be determined in the range of 45° or more and 90° or less. Furthermore, the first and second intersection angles may have values substantially identical to each other, or may have values different from each other. 
     When the first and second intersection angles have values different from approximately 90°, or even when the first and second intersection angles are different from each other, the resin member  5  is manufactured by injection molding, in a manner similar to the present embodiment. 
     [Effects] 
     (1) The above-described embodiments can facilitate shortening of the length of the rod-shaped portions while arranging the rod-shaped portions throughout the second chamber  30 . This makes it possible to inhibit the base of each rod-shaped portion from being thicker due to formation of the draft, to thereby inhibit accumulation of heat around the base of the rod-shaped portion when carrying out injection molding. Accordingly, occurrence of a warpage in the rod-shaped portion can be inhibited, resulting in facilitating manufacture of the canister  1 . 
     Moreover, inhibiting occurrence of a warpage in the rod-shaped portion results in improvement of accuracy in dimensions of the resin member  5 . Even when a warpage occurs in the rod-shaped portion, shortening of the length of the rod-shaped portion makes it possible to reduce dimensional deviation due to the warpage. Furthermore, shortening of the length of the rod-shaped portions makes it possible to reduce an injection stroke when manufacturing the resin member  5  by injection molding, thus enabling the injection molding to be carried out in shorter cycles. Additionally, an amount of the resin required to manufacture the resin member  5  can be reduced by inhibiting the bases of the rod-shaped portions from being thicker, thus enabling the canister  1  to be lighter in weight and lower in cost. 
     (2) The resin member  5  is arranged in the second chamber  30  having an elongated shape, and this can further facilitate shortening of the length of the rod-shaped portions. Accordingly, it is possible to inhibit the base of each rod-shaped portion from being thicker due to formation of the draft, to thereby further inhibit occurrence of a warpage in the rod-shaped portion when carrying out injection molding for the resin member  5 . 
     (3) Forming the recess  59  on each rod-shaped portion results in forming gaps between the recess  59  and the pellets as the adsorbent. Accordingly, the ventilation resistance of the canister  1  can be reduced. 
     (4) When carrying out injection molding, the first and second rod-shaped units  50  and  52  can be formed by means of the first and second dies  7 A and  7 B, respectively, positioned on each side of the coupling member  54 . Further, the first rod-shaped portions  51  in the first rod-shaped unit  50  and the second rod-shaped portions  53  in the second rod-shaped unit  52  extend in mutually opposite directions. This makes it possible to further facilitate shortening of the length of the rod-shaped portions while arranging the rod-shaped portions throughout the second chamber  30 . Accordingly, occurrence of a warpage in the rod-shaped portion can be further inhibited when carrying out injection molding for the resin member  5 . 
     Other Embodiments 
     (1) The resin member  5  of the above-described embodiments comprise the first and second rod-shaped units  50  and  52 , but may be configured with the first rod-shaped unit  50  alone. In other words, the first rod-shaped portions  51  may be provided on the first portion  54 A alone of the coupling member  54 . The length of the first rod-shaped portions  51  may be adjusted, and the resin member  5  may be arranged in the chamber such that the coupling member  54  and the tips of the first rod-shaped portions  51  are positioned on, or in the vicinity of, the inner wall of the second chamber  30 . Alternatively, two or more rod-shaped units may be provided on the first portion  54 A and/or the second portion  54 B of the resin member  5  of the above-described embodiments, to thereby provide the resin member  5  with three or more rod-shaped units. 
     (2) Two or more functions of a single element in the above-described embodiments may be performed by two or more elements, and a single function of a single element may be performed by two or more elements. Two or more functions performed by two or more elements may be performed by a single element, and a single function performed by two or more elements may be performed by a single element. Part of the configuration in the above-described embodiments may be omitted. At least a part of the configuration in the above-described embodiments may be added to or replace another configuration in the above-described embodiments.