JP6723940B2 - Canister and fuel vapor treatment device - Google Patents

Description

The present invention relates to a canister and an evaporated fuel processing device. More specifically, the present invention relates to a canister and an evaporated fuel processing device used in an evaporated fuel processing device for an internal combustion engine (engine) mounted on a vehicle such as an automobile.

BACKGROUND ART Conventionally, there is known a canister including an adsorbent that adsorbs the evaporated fuel in a desorbable manner in a casing in order to prevent the evaporated fuel generated in the fuel tank from flowing into the atmosphere. For example, the canister disclosed in Patent Document 1 includes a casing, a suction chamber, and an elastic member. The casing has a tank port that communicates with the upper air chamber of the fuel tank, a purge port that communicates with the intake passage of the internal combustion engine, and an atmosphere port that is open to the atmosphere. The adsorption chamber is formed inside the casing. The adsorption chamber contains an adsorbent that adsorbs the evaporated fuel flowing from the tank port to the atmospheric port and desorbs the evaporated fuel when the air from the atmospheric port is sucked into the purge port. The elastic member is arranged in the casing and biases the adsorbent toward the atmosphere port. A filter member for filtering the air introduced into the atmospheric port is provided between the atmospheric port and the adsorbent. The filter member is formed of foam such as urethane in a block shape and has elasticity and air permeability.

JP, 2015-48841, A

In the canister disclosed in Patent Document 1, the filter member is directly interposed between the atmospheric port and the adsorbent. Therefore, the biasing force of the elastic member is applied to the filter member via the adsorbent. Therefore, there is a risk that the filter member undergoes compressive deformation, causing clogging and increasing the pressure loss.

The present invention was created in order to improve the above points, and the problem to be solved by the present invention is to avoid compressive deformation of a filter member of an air filter by an elastic member that biases an adsorbent. An object of the present invention is to provide a canister and an evaporated fuel processing device capable of preventing or suppressing clogging and pressure loss of a filter member.

The present invention takes the following means in order to solve the above problems.

A first aspect of the present invention is a casing having a tank port that communicates with an upper air chamber of a fuel tank, a purge port that communicates with an intake passage of an internal combustion engine, and an atmosphere port that is open to the atmosphere; And an adsorption chamber containing an adsorbent that adsorbs the evaporated fuel flowing from the tank port to the atmospheric port and desorbs the evaporated fuel when the air from the atmospheric port is sucked into the purge port. And an elastic member that is disposed in the casing and biases the adsorbent toward the atmosphere port side, and an air filter is provided between the atmosphere port and the adsorbent. It is provided, the air filter comprises a case portion, a partition member and a filter member, the case portion is provided in the casing, an end wall portion having the atmospheric port, and the end wall portion of the end wall portion. And a cylindrical wall portion connected to the outer peripheral portion, the partition member has a plate-shaped partition plate portion having air permeability, the opening portion of the cylindrical wall portion on the adsorption chamber side. It is provided so as to be closed and the movement of the partition plate portion toward the end wall portion side is regulated, and the filter member is provided in a storage space formed between the case portion and the partition member. The filter member is a canister that is housed, is formed in a block shape having elasticity and air permeability, and is elastically contacted with the end wall portion and/or the cylindrical wall portion.

According to the first aspect of the present invention, in the air filter provided between the atmospheric port of the canister and the adsorbent, the partition member that closes the opening on the adsorption chamber side of the cylindrical wall portion of the case portion of the casing is the partition member. It is provided in a state where the movement of the plate portion toward the end wall portion is restricted. Therefore, the urging force of the elastic member for urging the adsorbent is blocked by the partition member, so that the urging force is not applied to the filter member in the accommodation space partitioned by the partition member. Therefore, it is possible to avoid compressive deformation of the filter member of the air filter due to the elastic member, and prevent or suppress clogging and pressure loss of the filter member. Further, the filter member is elastically contacted with the end wall portion and/or the cylindrical wall portion. Therefore, the air introduced into the adsorption chamber from the atmospheric port can be reliably filtered by the filter member.

2nd invention is a 1st invention, Comprising: The said partition member has a fitting cylinder part fitted in the said cylinder wall part, and contact|abutting the said end wall part, The said filter member is the said fitting. It is a canister that is disposed in the coupling cylinder portion and is elastically contacted with the end wall portion.

According to the second aspect of the invention, the fitting tubular portion of the partition member is fitted into the tubular wall portion and abuts against the end wall portion, whereby the partition plate portion of the partition member moves to the tubular wall portion side. Can be regulated. Further, the filter member arranged in the fitting cylindrical portion of the partition member is elastically contacted with the end wall portion. Therefore, the air introduced into the adsorption chamber from the atmospheric port can be reliably filtered by the filter member.

A third invention is the canister according to the first invention or the second invention, in which an annular pressing protrusion that surrounds the opening of the atmospheric port is formed on the inner surface side of the end wall portion.

According to the third aspect, the compression rate due to the contact of the filter member with the pressing protrusion formed on the end wall portion can be partially increased, and the airtightness between the filter member and the end wall portion is enhanced. be able to.

A fourth aspect of the invention is the canister according to the first aspect of the invention, in which a regulation portion that regulates movement of the partition plate portion toward the end wall portion is formed on the inner surface side of the cylindrical wall portion.

According to the above-mentioned fourth invention, the movement of the partition plate portion of the partition member toward the cylinder wall portion can be regulated by the restriction portion formed on the inner surface side of the cylinder wall portion.

A fifth aspect of the invention is the canister according to the fourth aspect of the invention, wherein the restricting portion is a plurality of restricting ridges extending along a flow direction of air.

According to the fifth aspect of the invention, since the restricting portion is a plurality of restricting ridges extending along the air flow direction, that is, the axial direction, the plurality of restricting ridges should be formed simultaneously with the resin molding of the casing. Is possible.

A sixth invention is the canister according to the fourth invention, wherein the restriction portion is a stepped portion that fits the outer peripheral portion of the partition member.

According to the sixth aspect of the present invention, since the regulation portion is the stepped portion that fits the outer peripheral portion of the partition member, the stepped portion can be formed simultaneously with resin molding of the casing.

A seventh invention is the canister according to the sixth invention, wherein the partition member is coupled to the stepped portion.

According to the seventh aspect of the invention, since the partition member is coupled to the stepped portion, rattling of the partition member due to vibration or the like can be suppressed.

In an eighth aspect based on the first aspect, one member of the end wall portion and the partition member penetrates the filter member and abuts the other member to thereby end wall of the partition plate portion. It is a canister in which a restriction portion that restricts movement toward the section side is formed.

According to the eighth aspect of the present invention, the regulating portion formed on one of the end wall portion and the partition member penetrates the filter member and abuts on the other member, whereby the partition plate portion of the partition member is formed. It is possible to regulate the movement toward the cylinder wall portion side.

A ninth invention is the canister according to the eighth invention, wherein the filter member is formed with an insertion portion through which the restriction portion is inserted in a press-fitted state.

According to the ninth aspect of the invention, since the regulation portion is inserted into the insertion portion of the filter member in a press-fitted state, the airtightness between the insertion portion of the filter member and the regulation portion can be enhanced.

A tenth aspect of the invention is the fuel cell system according to any one of the first to ninth aspects, including an atmosphere-side adsorption chamber adjacent to the atmosphere port, and a tank-side adsorption chamber adjacent to the tank port and the purge port, The average particle size of the adsorbent contained in the atmosphere side adsorption chamber is larger than the average particle size of the adsorbent contained in the tank side adsorption chamber, and the adsorbent contained in the atmosphere side adsorption chamber is hollow. The canister has a cylindrical peripheral wall portion and a partition wall that divides the hollow portion of the peripheral wall portion into a plurality of partitions.

According to the tenth aspect of the invention, the adsorbent contained in the atmosphere side adsorption chamber has an average particle size larger than the average particle size of the adsorbent contained in the tank side adsorption chamber, and the hollow cylindrical peripheral wall And a partition wall that partitions the hollow portion of the peripheral wall portion into a plurality of portions. Therefore, pressure loss (pressure loss) per unit volume of the adsorbent in the atmosphere-side adsorption chamber can be suppressed. Further, since the urging force of the elastic member that urges the adsorbent in the atmosphere-side adsorption chamber is blocked by the partition member, even if the average particle size of the adsorbent in the atmosphere-side adsorption chamber is large, the adsorbent does not operate the filter member. It is possible to suppress local compression. Therefore, it is possible to suppress an increase in pressure loss due to local compressive deformation of the filter member.

An eleventh aspect of the invention is an evaporative fuel treatment apparatus including an atmosphere opening passage that is connected to the atmosphere port of the canister according to any one of the first to tenth aspects of the invention and has an atmosphere opening portion that is open to the atmosphere. The evaporative fuel treatment apparatus is not provided with an air filter for filtering air introduced into the atmospheric port between the atmospheric port and the atmospheric opening portion of the atmospheric opening passage.

According to the eleventh aspect, the air filter for filtering the air introduced into the atmosphere port is not provided between the atmosphere port of the canister and the atmosphere opening portion of the atmosphere opening passage. That is, the air filter provided in the canister filters the air introduced into the atmospheric port to form an air filter as a separate component between the atmospheric port of the canister and the atmospheric opening portion of the atmospheric opening passage. There is no need to provide it. Therefore, it is possible to reduce the number of parts required for the evaporated fuel processing device and reduce the cost.

According to the present invention, by adopting the above-described means, it is possible to avoid compressive deformation of the filter member of the air filter due to the elastic member that biases the adsorbent, and prevent or suppress clogging and pressure loss of the filter member.

FIG. 1 is a configuration diagram showing an evaporated fuel processing apparatus according to a first embodiment. It is sectional drawing which shows a canister. It is sectional drawing which shows an air filter. FIG. 4 is a sectional view taken along line IV-IV of FIG. 3. It is sectional drawing which decomposes|disassembles and shows an air filter. It is a top view which shows a partition member. It is a perspective view showing a filter member. It is a perspective view which shows a 2nd adsorption material. It is a sectional view showing an air filter concerning Embodiment 2. FIG. 6 is a cross-sectional view showing an air filter according to a third embodiment. FIG. 11 is a sectional view taken along the line XI-XI of FIG. 10. It is sectional drawing which shows the air filter concerning Embodiment 4. FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. 12. It is sectional drawing which shows the air filter concerning Embodiment 5.

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

[Embodiment 1]
The first embodiment of the present invention will be described. In the present embodiment, the canister will be described after the evaporative fuel processing device has been described. FIG. 1 is a configuration diagram showing an evaporated fuel processing device. As shown in FIG. 1, the evaporated fuel processing device 10 includes a purge passage 18 that connects a fuel tank 12 mounted on a vehicle such as an automobile with an intake passage 16 of an engine (internal combustion engine) 14, and a purge passage 18. A canister 20 is provided on the way.

The fuel tank 12 is provided with an inlet pipe 22 having a fuel filler port 23. The inlet pipe 22 is a pipe for introducing the fuel injected from the fuel filler 23 into the fuel tank 12. A tank cap 24 is detachably attached to the opening end of the fuel filler 23.

The purge passage 18 includes a tank-side passage portion 18a that communicates the upper air chamber of the fuel tank 12 with the tank port 26 of the canister 20, and a purge-side passage portion 18b that communicates the purge port 28 of the canister 20 with the intake passage 16. Consists of. A purge control valve 30 is provided in the purge side passage portion 18b. An atmosphere opening passage 34 having an atmosphere opening portion 35 that is open to the atmosphere is connected to the atmosphere port 32 of the canister 20. The atmosphere opening passage 34 connects the atmosphere port 32 of the canister 20 to the atmosphere. The atmosphere opening portion 35 is opened, for example, near the fuel filler port 23.

The canister 20 accommodates a granular adsorbent 36 made of activated carbon or the like that adsorbs and desorbs evaporated fuel generated in the fuel tank 12. The canister 20 introduces the evaporated fuel generated in the fuel tank 12 through the tank side passage portion 18a and adsorbs it by the adsorbent 36. This prevents the evaporated fuel from being released to the atmosphere. 1, reference numeral 37 is a throttle valve, 38 is an air cleaner, and 39 is an air cleaner element.

The purge control valve 30 is opened/closed by an engine control unit (ECU) according to the operating state of the engine 14. When the purge control valve 30 is opened, the intake negative pressure acts on the inside of the canister 20 via the purge side passage portion 18b. As a result, the evaporated fuel adsorbed by the adsorbent 36 in the canister 20 is desorbed from the adsorbent 36 and is introduced into the intake passage 16 via the purge-side passage 18b to be burned in the engine 14. .. At this time, the atmosphere, that is, air, is introduced into the canister 20 through the atmosphere opening passage 34. Further, in the evaporated fuel processing device 10, an air filter for filtering the air introduced into the atmospheric port 32 is not provided between the atmospheric port 32 of the canister 20 and the atmospheric opening portion 35 of the atmospheric opening passage 34.

Next, the canister 20 will be described. FIG. 2 is a sectional view showing the canister. Further, for convenience of description, the up, down, left, and right of the canister 20 will be determined based on FIG. 2, but the arrangement direction of the canister 20 on the vehicle is not specified.

As shown in FIG. 2, the canister 20 includes a casing 42. The casing 42 is made of resin and includes a casing body 43 and a cover plate 44. The casing main body 43 is formed in a bottomed tubular shape having a tubular peripheral wall portion 45 and an upper wall portion 46 that closes one end surface (upper end surface in FIG. 2) of the peripheral wall portion 45. The cover plate 44 is joined to the opening end (lower end in FIG. 2) of the casing body 43 by welding or the like, and closes the opening end.

The upper wall portion 46 of the casing body 43 is formed with three ports protruding upward and arranged in the left-right direction, that is, a tank port 26, a purge port 28, and an atmosphere port 32. Further, on the upper wall portion 46 of the casing body 43, a left partition wall portion 48 and a right partition wall portion 49 extending downward are formed. The partition wall 49 on the right side extends to the vicinity of the cover plate 44, and the first adsorption chamber 51 that communicates with the purge port 28 and the tank port 26 in the casing body 43 and the second adsorption chamber 51 that communicates with the atmosphere port 32. It is divided into the adsorption chamber 52. The partition wall portion 48 on the left side is formed with a protruding amount shorter than the protruding amount of the partition wall portion 49 on the right side, and the upper end portion in the first adsorption chamber 51 is located on the tank port 26 side and the purge port 28 side. It is divided into parts. The second adsorption chamber 52 corresponds to the adsorption chamber on the atmosphere port 32 side.

The first adsorption chamber 51 and the second adsorption chamber 52 are filled with the adsorbent 36. The adsorbent 36 filled in the first adsorption chamber 51 is referred to as a first adsorbent 36 (reference numeral (A) is attached), and the adsorbent 36 filled in the second adsorption chamber 52 is referred to as a first adsorbent 36 (reference numeral). , (B)). As the first adsorbent 36(A), for example, a granular adsorbent such as activated carbon is used. As the second adsorbent 36(B), a granular adsorbent made of granulated carbon obtained by granulating granular or powdery activated carbon together with a binder is used.

FIG. 8 is a perspective view showing the second adsorbent 36(B). As shown in FIG. 8, the second adsorbent 36(B) includes a hollow cylindrical peripheral wall portion 36a and a cross-shaped partition wall 36b for partitioning the hollow portion of the peripheral wall portion 36a into a plurality (four in FIG. 8). And have. By the partition wall 36b, the hollow portion of the peripheral wall portion 36a is partitioned into four through holes 36c penetrating in the axial direction. The diameter 36d and the length 36L of the second adsorbent 36(B) are set to 36d<36L, for example. The diameters 36d and 36L of the second adsorbent 36(B) may be set to 36d=36L or 36d>36L.

As the second adsorbent 36(B), a large particle having an average particle size (corresponding to the diameter 36d in the present embodiment) larger than that of the first adsorbent 36(A) is used. There is. For example, when the average particle diameter of the first adsorbent 36(A) is 2 mm, the diameters 36d and 36L of the second adsorbent 36(B) are set to 3 to 7 mm, preferably 4 to 6 mm. The average particle diameter of the first adsorbent 36(A) represents the average particle diameter of the adsorbent in terms of volume, and a certain volume of particles is sieved in ascending order, and its 50% volume is obtained. The particle size at the time when the particles corresponding to are separated. The first adsorption chamber 51 corresponds to the "tank side adsorption chamber" in this specification. The second adsorption chamber 52 corresponds to the "atmosphere side adsorption chamber" in the present specification.

Between the tank port 26 and the first adsorbent 36(A), and between the purge port 28 and the first adsorbent 36(A), prior to filling the first adsorbent 36(A), A sheet-shaped filter 54 that covers the tank port 26 and the purge port 28 is arranged. The filter 54 is a filter for holding the adsorbent, and is made of, for example, a non-woven fabric. An air filter 56 is provided between the atmosphere port 32 and the second adsorbent 36(B) in the second adsorption chamber 52. The air filter 56 will be described later.

An elastic member 58 is arranged on the inner surface side of the cover plate 44 so as to overlap. The elastic member 58 is made of urethane foam resin or the like and has a predetermined elasticity. The elastic member 58 is arranged so as to cover the open end of the casing body 43, that is, the lower end surfaces of the adsorption chambers 51 and 52, and moves the adsorbents 36(A) and 36(B) toward the atmosphere port 32 side, that is, upward. Urged to. The biasing of the elastic member 58 suppresses the roughness of the adsorbents 36(A) and 36(B) due to vibration or the like. A communication passage 59 is formed between the elastic member 58 and the partition wall 49 on the right side so as to communicate the adsorption chambers 51 and 52 with each other.

Next, the operation of the canister 20 will be described. Evaporated fuel gas containing evaporated fuel generated in the fuel tank 12 at the time of refueling and normal time (for example, parking) is introduced into the first adsorption chamber 51 via the tank port 26. The evaporated fuel gas passes through the first adsorption chamber 51, the communication passage 59, and the second adsorption chamber 52. At that time, the evaporated fuel in the evaporated fuel gas is adsorbed by the first adsorbent 36 (A) in the first adsorption chamber 51 and the second adsorbent 36 (B) in the second adsorption chamber 52. Then, the gas that has become almost air is released from the atmospheric port 32.

During purging (during purge control during operation of the engine 14), the intake negative pressure of the engine 14 is introduced into the first adsorption chamber 51 via the purge port 28, so that air in the atmosphere evaporates. Contrary to the flow of fuel gas, it passes through the second adsorption chamber 52, the communication passage 59, and the first adsorption chamber 51. At this time, the evaporated fuel is desorbed (purged) from the first adsorbent 36 (A) of the first adsorption chamber 51 and the second adsorbent 36 (B) of the second adsorption chamber 52, and the purge port 28 together with the air. Purged from.

Next, the air filter 56 provided between the atmospheric port 32 of the canister 20 and the second adsorbent 36(B) of the second adsorption chamber 52 will be described. 3 is a sectional view showing the air filter, FIG. 4 is a sectional view taken along the line IV-IV of FIG. 3, FIG. 5 is a sectional view showing the air filter in a disassembled state, FIG. 6 is a plan view showing the partition member, and FIG. FIG. 6 is a perspective view showing a filter member. As shown in FIG. 3, the air filter 56 includes a case portion 61, a partition member 63, and a filter member 65.

As shown in FIG. 5, the case portion 61 is provided in the casing 42, and has an end wall portion 67 having the atmosphere port 32 and a cylindrical tubular wall portion 68 connected to the outer peripheral portion of the end wall portion 67. And have. The end wall portion 67 corresponds to a part of the upper wall portion 46 of the casing 42. Further, the tubular wall portion 68 is formed by an upper portion of a tubular portion formed by the peripheral wall portion 45 forming the second adsorption chamber 52 of the casing 42 and the partition wall portion 49 on the right side. The atmosphere port 32 is formed in a tubular shape with two steps, and has a large tubular portion 32a with a large opening area at the base and a small tubular portion 32b with a small opening area at the tip. The large tubular portion 32 a is connected to the central portion of the end wall portion 67 so as to communicate with the inside of the tubular wall portion 68.

On the inner surface side of the end wall portion 67, an annular pressing protrusion 70 that surrounds the opening of the large tubular portion 32a of the atmosphere port 32 is formed. The pressing protrusion 70 is formed in a triangular cross-section that is tapered downward.

The partition member 63 is made of resin and has a bottomed tubular shape. The partition member 63 has a fitting cylinder portion 72 and a partition plate portion 74 (see FIGS. 5 and 6). As shown in FIG. 3, the fitting tubular portion 72 is formed so that it can be fitted into the tubular wall portion 68 with substantially no space (see FIG. 4 ). The partition plate portion 74 closes one end surface (lower end surface) of the fitting tubular portion 72. The partition plate portion 74 is formed in a lattice plate shape having a large number of ventilation holes 75, that is, a so-called mesh plate shape, and has air permeability (see FIGS. 5 and 6 ).

As shown in FIG. 3, by fitting the partition member 63 into the cylindrical wall portion 68 of the case portion 61, the opening of the cylindrical wall portion 68 on the second adsorption chamber 52 side is closed and the case is A predetermined accommodation space is formed between the portion 61 and the partition member 63. The partition member 63 is urged upward by the urging force of the elastic member 58 (see FIG. 2) via the second adsorbent 36(B), so that the upper end surface of the fitting tubular portion 72 moves toward the end wall portion 67. It is pressed. As a result, the movement of the partition plate portion 74 to the upper side, that is, the end wall portion 67 side is restricted.

The filter member 65 is made of, for example, a porous material such as urethane foam resin, and is formed in a block-like so-called columnar shape having elasticity and air permeability (see FIG. 7). As shown in FIG. 5, the height (axial length) 65H of the filter member 65 in the free state is set to be slightly larger than the depth (axial length) 72D in the partition member 63. Therefore, in the state where the filter member 65 is fitted in the partition member 63, the upper end portion of the filter member 65 projects upward from the fitting tubular portion 72 (see the chain double-dashed line 65 in FIG. 5 ). The upper surface and the lower surface of the filter member 65 are parallel to each other.

As shown in FIG. 3, the filter member 65 is fitted into the partition member 63 with almost no space, and is housed in the housing space between the case portion 61 and the partition member 63. The lower surface of the filter member 65 is in contact with the upper surface of the partition plate portion 74. The upper surface of the filter member 65 is elastic with respect to the inner surface (lower surface) of the end wall portion 67 of the case portion 61 when the partition member 63 is urged upward by the urging force of the elastic member 58 (see FIG. 2 ). Have been touched. Further, the pressing projection 70 of the end wall portion 67 compresses the portion of the upper surface of the filter member 65 that surrounds the opening of the large tubular portion 32 a of the atmospheric port 32.

A procedure for assembling the partition member 63 and the filter member 65 to the case portion 61 will be described. Prior to filling the casing body 43 with the second adsorbent 36(B), the partition member 63 fitted with the filter member 65 is fitted into the case portion 61. Then, after the second adsorbent 36(B) is filled in the casing body 43, the elastic member 58 and the cover plate 44 are attached to the casing body 43 (see FIG. 2). At this time, the partition member 63 is biased upward by the biasing force of the elastic member 58 via the second adsorbent 36(B), whereby the filter member 65 is compressed in the axial direction (vertical direction) and The partition member 63 is pressed against the end wall portion 67 of the case portion 61. The elastic member 58 may be attached to the cover plate 44 in advance.

According to the canister 20 described above, in the air filter 56 provided between the atmosphere port 32 of the canister 20 and the second adsorbent 36(B), the second adsorption chamber 52 of the cylindrical wall portion 68 of the case portion 61 of the casing 42 is provided. The partition member 63 that closes the opening on the side is provided in a state in which the movement of the partition plate portion 74 toward the end wall portion 67 is restricted. Therefore, the urging force of the elastic member 58 for urging the second adsorbent 36 (B) is blocked by the partition member 63, and the urging force is applied to the filter member 65 of the accommodation space partitioned by the partition member 63. Never. Therefore, the compressive deformation of the filter member 65 of the air filter 56 by the elastic member 58 can be avoided, and the clogging and pressure loss of the filter member 65 can be prevented or suppressed. As a result, the dust contained in the air introduced into the second adsorption chamber 52 from the atmospheric port 32 can be favorably collected for a long period of time.

The filter member 65 is elastically contacted with the end wall portion 67. Therefore, the air introduced from the atmospheric port 32 into the adsorption chamber can be reliably filtered by the filter member 65.

Further, the fitting cylinder portion 72 of the partition member 63 is fitted into the cylinder wall portion 68 and abuts against the end wall portion 67, whereby the partition plate portion 74 of the partition member 63 moves to the cylinder wall portion 68 side. Can be regulated.

Further, the filter member 65 arranged in the fitting tubular portion 72 of the partition member 63 is elastically contacted with the end wall portion 67. Therefore, the air introduced into the second adsorption chamber 52 from the atmosphere port 32 can be reliably filtered by the filter member 65.

Further, the compression rate due to the contact of the filter member 65 with the pressing protrusion 70 formed on the end wall portion 67 can be partially increased, and the airtightness between the filter member 65 and the end wall portion 67 can be increased. ..

The second adsorbent 36(B) contained in the second adsorption chamber 52 has an average particle diameter (diameter larger than that of the first adsorbent 36(A) contained in the first adsorption chamber 51. 36d), which has a hollow cylindrical peripheral wall portion 36a and a partition wall 36b that partitions the hollow portion of the peripheral wall portion 36a into a plurality of portions. Therefore, the pressure loss (pressure loss) per unit volume of the second adsorbent 36(B) in the second adsorption chamber 52 can be suppressed. Further, since the urging force of the elastic member 58 that urges the second adsorbent 36(B) in the second adsorption chamber 52 is blocked by the partition member 63, the second adsorbent 36(B) in the second adsorption chamber 52 is blocked. Even if the average particle diameter (diameter 36d) of is large, it is possible to suppress the second adsorbent 36(B) from locally compressing the filter member 65. Therefore, it is possible to suppress an increase in pressure loss due to local compressive deformation of the filter member 65.

Further, according to the above-described evaporative fuel processing apparatus 10, the air filter 56 for filtering the air introduced into the atmospheric port 32 is provided between the atmospheric port 32 of the canister 20 and the atmospheric opening portion 35 of the atmospheric opening passage 34. Has not been done. That is, the air introduced into the atmospheric port 32 is filtered by the air filter 56 provided in the canister 20, so that the air port 32 of the canister 20 and the atmospheric opening portion 35 of the atmospheric opening passage 34 are often kept. It is not necessary to provide the air filter 56 as a separate component. Therefore, it is possible to reduce the number of parts required for the evaporated fuel processing device 10 and reduce the cost.

[Embodiment 2]
In the present embodiment, since the pressing protrusion 70 (see FIG. 3) of the case portion 61 of the air filter 56 in the first embodiment is changed, only the changed portion will be described and duplicated description will be omitted. FIG. 9 is a sectional view showing the air filter. As shown in FIG. 9, the pressing protrusion (denoted by reference numeral 77) of the present embodiment is formed in a rectangular cross section. The pressing protrusion 77 can increase the compression area of the filter member 65.

[Third Embodiment]
Since the present embodiment is a modification of the air filter 56 of the first embodiment (see FIG. 3 ), only the changed part will be described and the duplicated description will be omitted. 10 is a sectional view showing the air filter, and FIG. 11 is a sectional view taken along the line XI-XI of FIG. As shown in FIG. 10, the partition member (denoted by reference numeral 80) is made of resin, is formed in a lattice plate shape, a so-called mesh plate shape, and has air permeability. The partition member 80 is fitted in the cylindrical wall portion 68 of the case portion 61 with almost no space (see FIG. 11 ). The partition member 80 has a plate thickness larger than that of the partition plate portion 74 (see FIG. 3) of the first embodiment, and has a large number of coarse ventilation holes 81. The partition member 80 is also a “partition plate portion” in the present specification.

On the inner surface side of the cylindrical wall portion 68 of the case portion 61, a plurality of (representing five in FIG. 11) restricting ridges 83 extending along the air flow direction, that is, the axial direction (vertical direction in FIG. 10) are provided. Has been formed. The restriction ridges 83 are arranged dispersively in the circumferential direction on the inner surface side of the cylindrical wall portion 68. The restriction ridge 83 is formed downward from the end wall portion 67 with a predetermined height (axial length) 83H. The restriction ridge 83 is formed in a semicircular cross section. Further, the pressing protrusion 70 (see FIG. 3) of the end wall portion 67 in the first embodiment is omitted.

By fitting the partition member 80 into the tubular wall portion 68 of the case portion 61, the opening of the tubular wall portion 68 on the second adsorption chamber 52 side is closed, and the case portion 61 and the partition member 80 are A predetermined accommodation space is formed between the two. The partition member 80 is urged upward by the urging force of the elastic member 58 (see FIG. 2) via the second adsorbent 36(B), and thus is pressed against the lower end surfaces of the plurality of regulating protrusions 83. There is. As a result, the movement of the partition plate portion 74 to the upper side, that is, the end wall portion 67 side is restricted. The regulation ridges 83 correspond to the “regulation section” in this specification.

The height (axial length) 85H of the filter member (denoted by reference numeral 85) in the free state (see the alternate long and two short dashes line 85 in FIG. 10) is set to be slightly larger than the height 83H of the regulating projection 83. Has been done. The filter member 85 is press-fitted into the tubular wall portion 68 of the case portion 61. The lower surface of the filter member 85 is in contact with the upper surface of the partition member 80. The upper surface of the filter member 85 is elastic with respect to the inner surface (lower surface) of the end wall portion 67 of the case portion 61 when the partition member 80 is urged upward by the urging force of the elastic member 58 (see FIG. 2 ). Have been touched.

A procedure for assembling the partition member 80 and the filter member 85 to the case portion 61 will be described. Prior to filling the second adsorbent 36 (B) into the casing body 43, the case member 61 is fitted with the filter member 85 and the partition member 80 in this order. After that, the procedure is the same as that in the first embodiment.

According to this embodiment, the filter member 85 is elastically contacted with the end wall portion 67 and the cylindrical wall portion 68 of the case portion 61. Therefore, the air introduced from the atmosphere port 32 into the second adsorption chamber 52 can be reliably filtered by the filter member 85.

Further, the movement of the partition member 80 toward the cylinder wall portion 68 can be restricted by the plurality of restricting protrusions 83 formed on the inner surface side of the cylinder wall portion 68 of the case portion 61.

Further, since the plurality of regulating ridges 83 extend along the air flow direction, that is, the axial direction, it is possible to form the plurality of regulating ridges 83 simultaneously with the resin molding of the casing 42.

[Embodiment 4]
The present embodiment is a modification of the air filter 56 of the third embodiment (see FIG. 10), and therefore only the modified part will be described and duplicate description will be omitted. 12 is a sectional view showing the air filter, and FIG. 13 is a sectional view taken along the line XIII-XIII in FIG. As shown in FIG. 12, the partition member (denoted by reference numeral 87) uses the partition member 80 (see FIG. 10) of the third embodiment as a partition plate portion 88.

On the upper surface side of the partition plate portion 88, a plurality of (five in FIG. 13) restriction pins 90 extending in the air flow direction, that is, the axial direction (vertical direction in FIG. 12) are formed. The plurality of regulation pins 90 are arranged in a distributed manner in the portion of the partition plate portion 88 facing the end wall portion 67 of the case portion 61. The regulation pin 90 has a circular cross section. The restriction pin 90 is formed upward from the partition plate portion 88 with a predetermined height 90H (axial length). The height of the restriction pin 90 is set to be the same as the height 83H (see FIG. 10) of the restriction protrusion 83 in the third embodiment. Further, the restricting ribs 83 (see FIG. 10) in the third embodiment are omitted.

By fitting the partition member 87 into the cylindrical wall portion 68 of the case portion 61, the opening of the cylindrical wall portion 68 on the side of the second adsorption chamber 52 is closed, and the case portion 61 and the partition plate portion 88. A predetermined accommodation space is formed between the and. The partition member 87 is urged upward by the urging force of the elastic member 58 (see FIG. 2) via the second adsorbent 36(B), so that the upper end surfaces of the plurality of restriction pins 90 are moved to the end wall portion 67. It is pressed. As a result, the movement of the partition plate portion 88 to the upper side, that is, the end wall portion 67 side is restricted. The restriction pin 90 corresponds to the “restriction section” in this specification.

The filter member 85 has a plurality of insertion holes 92 corresponding to the plurality of restriction pins 90. The insertion hole 92 is formed in a round hole shape or a slit shape (a cut shape) that penetrates the filter member 85 in the vertical direction (axial direction). The insertion hole 92 is formed in such a size that the regulation pin 90 is inserted in a press-fitted state. The insertion hole 92 corresponds to the “insertion portion” in this specification.

A procedure for assembling the partition member 87 and the filter member 85 to the case portion 61 will be described. Prior to the filling of the second adsorbent 36(B) into the casing body 43, the plurality of restriction pins 90 of the partition member 87 are press-fitted into the plurality of insertion holes 92 of the filter member 85, so that the partition member 87. And the filter member 85 are assembled. The partition member 87, to which the filter member 85 is assembled, is fitted into the case portion 61. After that, the procedure is the same as that in the third embodiment.

According to the present embodiment, the regulating pin 90 formed on the partition member 87 penetrates the filter member 85 and abuts against the end wall portion 67 of the case portion 61, so that the cylindrical wall portion of the partition plate portion 88 of the partition member 87. The movement toward the 68 side can be restricted.

Further, since the restriction pin 90 is inserted into the insertion hole 92 of the filter member 85 in a press-fitted state, the airtightness between the insertion hole 92 of the filter member 85 and the restriction pin 90 can be enhanced.

Further, the regulation pin 90 may be formed on the end wall portion 67 of the case portion 61 instead of the partition plate portion 88. In this case, the regulation pin 90 penetrates the filter member 85 and comes into contact with the partition plate portion 88. Further, prior to the filling of the second adsorbent 36(B) into the casing body 43, the filter member 85 and the partition member 87 may be fitted to the case portion 61 in this order.

[Fifth Embodiment]
The present embodiment is a modification of the air filter 56 of the third embodiment (see FIG. 10), and therefore only the modified part will be described and duplicate description will be omitted. FIG. 14 is a sectional view showing the air filter. As shown in FIG. 14, a stepped portion 94 into which the outer peripheral portion of the partition member 80 is fitted is formed on the inner surface side of the cylindrical wall portion 68 of the case portion 61. The partition member 80 is fitted to the stepped portion 94. Thereby, the movement of the partition member 80 to the upper side, that is, the end wall portion 67 side is restricted. In this embodiment, the partition member 80 is joined to the stepped portion 94 by welding. The stepped portion 94 corresponds to the "regulating portion" in this specification. Further, the restricting ribs 83 (see FIG. 10) in the third embodiment are omitted.

According to the present embodiment, the stepped portion 94 of the cylindrical wall portion 68 of the case portion 61 can restrict the movement of the partition member 80 toward the cylindrical wall portion 68 side. Further, since it is the stepped portion 94 that fits the outer peripheral portion of the partition member 80, the stepped portion 94 can be formed simultaneously with the resin molding of the casing 42.

Further, since the partition member 80 is coupled to the stepped portion 94, rattling of the partition member 80 due to vibration or the like can be suppressed.

[Other Embodiments]
The present invention is not limited to the embodiments, and modifications can be made without departing from the present invention.

For example, the number of the second adsorption chambers 52 of the canister 20 may be increased or decreased. Further, as the second adsorbent 36(B), an adsorbent such as granular activated carbon or a honeycomb-shaped adsorbent may be used.

The filter member 85 is not limited to one, but may be a combination of a plurality of members.

Further, the sectional shape of the pressing protrusion 70 is not limited to the triangular shape or the quadrangular shape, and may be changed to any shape.

Further, the connection of the partition member 80 to the stepped portion 94 can be omitted.

As the elastic member 58 (see FIG. 2), elastic members of various shapes and materials may be used as long as they urge the adsorbents 36(A) and 36(B) toward the atmospheric port 32 side. Good. Specifically, a spring member such as a coil spring or a leaf spring may be used. In this case, a filter for holding the adsorbent and a plate member having air permeability may be interposed between the adsorbent and the spring member.

10 Evaporative Fuel Treatment Device 12 Fuel Tank 14 Engine (Internal Combustion Engine)
16 intake passage 20 canister 26 tank port 28 purge port 32 atmosphere port 34 atmosphere opening passage 35 atmosphere opening portion 36 adsorbent 36 (A) first adsorbent 36 (B) second adsorbent 36a peripheral wall portion 36b partition wall 42 casing 51 1 adsorption chamber (tank side adsorption chamber)
52 Second adsorption chamber (atmosphere side adsorption chamber)
58 elastic member 56 air filter 61 case part 63 partition member 65 filter member 67 end wall part 68 cylinder wall part 70 pressing protrusion 72 fitting cylinder part 74 partition plate part 80 partition member (partition plate part)
85 Filter member 87 Partitioning member 88 Partitioning plate part 83 Restricting ridge (regulating part)
90 Control Pin (Regulator)
92 Insertion hole (insertion part)
94 Stepped part (regulation part)

Claims (10)

A casing having a tank port communicating with the upper air chamber of the fuel tank, a purge port communicating with the intake passage of the internal combustion engine, and an atmosphere port open to the atmosphere;
An adsorbent, which is formed in the casing, adsorbs the evaporated fuel flowing from the tank port to the atmospheric port and desorbs the evaporated fuel when the air from the atmospheric port is sucked into the purge port is stored. Adsorption chamber,
An elastic member that is disposed in the casing and biases the adsorbent in the atmospheric port side direction,
A canister comprising:
An air filter is provided between the atmospheric port and the adsorbent,
The air filter includes a case portion, a partition member, and a filter member,
The case portion is provided in the casing and has an end wall portion having the atmospheric port, and a tubular wall portion connected to the outer peripheral portion of the end wall portion.
The partition member has a breathable plate-shaped partition plate portion, and restricts movement of the partition plate portion toward the end wall portion side so as to close the adsorption chamber side opening of the cylindrical wall portion. It is provided in a state where
The filter member is housed in a housing space formed between the case portion and the partition member,
The filter member is formed into a block shape having elasticity and breathability, and is elastically contacted with the end wall portion and/or the cylindrical wall portion ,
A canister in which an annular pressing protrusion that surrounds the opening of the atmosphere port is formed on the inner surface side of the end wall portion . The canister according to claim 1,
The partition member has a fitting tubular portion that fits into the tubular wall portion and abuts against the end wall portion,
The said filter member is a canister which is arrange|positioned in the said fitting cylinder part, and is contacting elastically with the said end wall part. The canister according to claim 1,
A canister in which a regulation portion that regulates the movement of the partition plate portion toward the end wall portion is formed on the inner surface side of the cylindrical wall portion. The canister according to claim 3 , wherein
The said control part is a canister which is a plurality of control protrusions extended along the flow direction of air. The canister according to claim 3 , wherein
The said control part is a canister which is a stepped part which fits the outer peripheral part of the said partition member. The canister according to claim 5 , wherein
A canister in which the partition member is coupled to the stepped portion. A casing having a tank port communicating with the upper air chamber of the fuel tank, a purge port communicating with the intake passage of the internal combustion engine, and an atmosphere port open to the atmosphere;
An adsorbent, which is formed in the casing, adsorbs the evaporated fuel flowing from the tank port to the atmospheric port and desorbs the evaporated fuel when the air from the atmospheric port is sucked into the purge port is stored. Adsorption chamber,
An elastic member that is disposed in the casing and biases the adsorbent in the atmospheric port side direction,
A canister comprising:
An air filter is provided between the atmospheric port and the adsorbent,
The air filter includes a case portion, a partition member, and a filter member,
The case portion is provided in the casing and has an end wall portion having the atmospheric port, and a tubular wall portion connected to the outer peripheral portion of the end wall portion.
The partition member has a breathable plate-shaped partition plate portion, and restricts movement of the partition plate portion toward the end wall portion side so as to close the adsorption chamber side opening of the cylindrical wall portion. It is provided in a state where
The filter member is housed in a housing space formed between the case portion and the partition member,
The filter member is formed in a block shape having elasticity and breathability, and is elastically contacted with the end wall portion and/or the cylindrical wall portion ,
One of the end wall portion and the partition member is provided with a restriction portion that penetrates the filter member and contacts the other member to restrict the movement of the partition plate portion toward the end wall portion. Has been a canister. The canister according to claim 7 , wherein
The canister, wherein the filter member has an insertion portion through which the restriction portion is inserted in a press-fitted state. A canister according to any one of claims 1 to 9 ,
An atmosphere side adsorption chamber adjacent to the atmosphere port, and a tank side adsorption chamber adjacent to the tank port and the purge port,
The average particle size of the adsorbent stored in the atmosphere side adsorption chamber is larger than the average particle size of the adsorbent stored in the tank side adsorption chamber,
The canister, wherein the adsorbent contained in the atmosphere-side adsorption chamber has a hollow cylindrical peripheral wall portion and a partition wall that partitions the hollow portion of the peripheral wall portion into a plurality of partitions. A fuel vapor processing apparatus including the atmosphere open passage having an open air section, which is connected to the atmospheric air port is open and the atmosphere of the canister described in any one of claims 1-9,
An evaporative fuel treatment apparatus in which an air filter for filtering air introduced into the atmosphere port is not provided between the atmosphere port of the canister and the atmosphere opening portion of the atmosphere opening passage.

Images