Evaporated fuel treatment device

Abstract

To suppress the damage of an adsorption material unit disposed near an opening portion, in an evaporation fuel treatment device in which the opening portion and a lid portion are fixed in a body case.SOLUTION: An evaporation fuel treatment device is provided. The evaporation fuel treatment device is equipped with a body case, and a lid portion. The body case is equipped with a plurality of adsorption chambers, an adsorption unit, and an opening portion. The lid portion blocks at least a part of the opening portion, and is configured to be fixed to a snap-fit structure to the body case. The lid portion and the adsorption unit are disposed in close proximity to each other.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an evaporative fuel treatment device.

Background Art

[0002] For example, Patent Document 1 below discloses a configuration in an evaporative fuel treatment device in which an opening in a main body case and a lid portion that closes the opening are fixed by welding.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in Patent Document 1 above, the opening and the lid portion may be fixed by vibration welding. Vibration welding is a method in which vibration is applied to the connecting portion of the opening and the lid portion, and a part of the opening and the lid portion is melted by the frictional heat thereof for welding.

[0005] However, as a result of the inventors' detailed examination, it has been found that in a configuration in which the opening and the lid portion are welded by vibration welding, the adsorbent unit disposed near the opening is likely to be damaged by vibration.

[0006] One aspect of the present disclosure is to make it difficult for an adsorbent unit disposed near an opening to be damaged in an evaporative fuel treatment device in which an opening in a main body case and a lid portion are fixed.

Means for Solving the Problems

[0007] One aspect of the present disclosure is an evaporative fuel treatment device. The evaporative fuel treatment device includes a main body case and a lid portion. The main body case includes a plurality of adsorption chambers, an adsorption unit, and an opening. The plurality of adsorption chambers are each configured to accommodate an adsorbent. The adsorption unit is an aggregate of adsorbents. The adsorption unit is disposed in an air-side adsorption chamber that communicates with the atmosphere among at least the plurality of adsorption chambers.

[0008] The opening is configured to communicate the air-side adsorption chamber with the atmosphere. The lid portion closes at least a part of the opening and is configured to be fixed to the main body case with a snap fit structure. The lid portion and the adsorption unit are disposed in proximity to each other.

[0009] According to such a configuration, in a configuration where the lid portion and the adsorption unit are disposed in proximity to each other, when fixing the lid portion to the main body case, since a snap fit structure is used, vibration during fixing is less likely to be transmitted to the adsorption unit compared to the case of using vibration welding. Therefore, damage to the adsorption unit can be suppressed.

[0010] In one aspect of the present disclosure, the outer peripheral portion of the adsorption unit may contact the main body case. According to such a configuration, since the outer peripheral portion of the adsorption unit contacts the main body case, a larger cross-sectional area of the flow path can be ensured.

[0011] In one aspect of the present disclosure, the main body case may include a holding portion, a large-diameter portion, and a stepped portion. In the holding portion, the adsorption unit is held. The large-diameter portion is disposed so as to surround the lid portion at a position spaced apart from the holding portion on the outer peripheral side of the holding portion, and is configured to be connected to the lid portion with a snap fit structure. The stepped portion constitutes a step connecting the holding portion and the large-diameter portion.

[0012] According to such a configuration, when connecting the main body case and the lid portion with a snap fit structure, if an impact occurs, this impact can be absorbed by the stepped portion. Therefore, it is possible to make it difficult for the impact to be transmitted to the holding portion and the adsorption unit.

[0013] One aspect of the present disclosure may further include a seal member configured to close the entire circumference between the opening and the lid portion. According to such a configuration, since the sealing member closes the entire circumference between the opening and the lid, it is possible to easily maintain airtightness at the opening without performing welding or the like.

[0014] In one aspect of the present disclosure, the atmosphere-side adsorption chamber may be a sub-chamber configured to have a smaller volume than the main chamber, which is the adsorption chamber communicating with the atmosphere-side adsorption chamber among the plurality of adsorption chambers. The cross-sectional area of the adsorption unit in the gas flow direction in the sub-chamber may be configured to be larger than the cross-sectional area of the adsorption unit in the gas flow direction in the main chamber.

[0015] According to such a configuration, it is possible to reduce the ventilation resistance of the evaporated fuel passing through the atmosphere-side adsorption chamber.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Mode for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Configuration] The evaporated fuel processing device 1A shown in FIGS. 1 to 3 has a function as a well-known canister. That is, it has a function of adsorbing and desorbing evaporated fuel generated in a fuel tank (not shown) of a vehicle. The evaporated fuel processing device 1A includes a main body case 2 and a lid portion 70.

[0018] The main body case 2 is a case that forms an internal space. The main body case 2 is, for example, a case made of synthetic resin. Note that the material of the main body case 2 is not limited to this. The main body case 2 includes a charge port 21, a purge port 22, an atmosphere port 23, and an auxiliary chamber portion 60. The ports 21 to 23 are arranged on the same side (for example, the upper side in FIG. 1) of the main body case 2. However, the direction of the atmosphere port 23 is different from that of the other ports 21 and 22. Note that the direction of a port is the direction in which the gas discharged from the port is guided. That is, the atmosphere port 23 is configured to guide gas in a direction different from that of the charge port 21 and the purge port 22, and the charge port 21 and the purge port 22 are configured to guide gas in the same direction.

[0019] Note that the gas referred to here is a gas that circulates inside the evaporated fuel processing device 1A and may include air and evaporated fuel. Hereinafter, the side of the main body case 2 where the charge port 21, the purge port 22, and the atmosphere port 23 are provided will be referred to as the port side. The main body case 2 has an opening 26 on the side opposite to the port side. The opening 26 is closed by a cap 27 that functions as a lid.

[0020] The charge port 21 is connected to the fuel tank of the vehicle by a pipe. The charge port 21 is configured to take in the evaporated fuel generated in the fuel tank into the evaporated fuel treatment device 1A.

[0021] The purge port 22 is connected to the intake pipe (not shown) of the vehicle engine via a purge valve. The purge port 22 is configured to discharge the evaporated fuel in the evaporated fuel treatment device 1A from the evaporated fuel treatment device 1A and supply it to the engine.

[0022] The atmosphere port 23 is disposed on the lid portion 70. The atmosphere port 23 is open to the atmosphere. The atmosphere port 23 discharges the gas from which the evaporated fuel has been removed into the atmosphere. Further, the atmosphere port 23 takes in external gas (i.e., purge gas) to desorb (i.e., purge) the evaporated fuel adsorbed by the evaporated fuel treatment device 1A.

[0023] As shown in FIG. 2, the internal space of the main body case 2 is partitioned into a first chamber 2A, a second chamber 2B, and a third chamber 2C. The first chamber 2A is, for example, substantially rectangular parallelepiped-shaped or cylindrical. The port-side end of the first chamber 2A is connected to the charge port 21 and the purge port 22. Further, a first filter 32 is disposed at the port-side end of the first chamber 2A. A second filter 33 is disposed at the cap 27-side end of the first chamber 2A. An adsorbent 40 is disposed between the first filter 32 and the second filter 33. The adsorbent 40 is, for example, an aggregate of a plurality of pellets. A pellet is granular activated carbon. The pellet is produced by kneading powdered activated carbon together with a binder and molding it into a predetermined shape. Note that an adsorbent other than pellets, such as powdered activated carbon, may be disposed in the first chamber 2A.

[0024] The cap 27-side end of the first chamber 2A is connected to the second chamber 2B. Inside the main body case 2, gas such as gas containing evaporated fuel can flow between the first chamber 2A and the second chamber 2B. The second chamber 2B is a space having an elongated shape extending from the end on the cap 27 side to the atmosphere port 23. The second chamber 2B is, for example, substantially rectangular parallelepiped-shaped or cylindrical. The port-side end of the second chamber 2B is connected to the third chamber 2C. Further, a first filter 38 is disposed at the end of the second chamber 2B on the cap 27 side. A second filter 54 is disposed at the port-side end of the second chamber 2B. An adsorbent 43 is disposed between the first filter 38 and the second filter 54 in the second chamber 2B. Note that the adsorbent 43 may be of the same type as the adsorbent 40 or a different type.

[0025] The third chamber 2C is formed in the auxiliary chamber portion 60. The third chamber 2C is a space adjacent to the second filter 54 side of the second chamber 2B. As shown in FIG. 3, the auxiliary chamber portion 60 includes a contact portion 61, an adsorption unit 62, a filter 63, an opening 65, a first engagement portion 66A, a holding portion 68, a step portion 68A, and a large-diameter portion 69. The adsorption unit 62 is inserted into the third chamber 2C from the opening 65.

[0026] The third chamber 2C in the auxiliary chamber portion 60 is configured to have a smaller volume (the volume of the internal space and the volume of the outer shape) than the adjacent second chamber 2B. That is, when the second chamber 2B is a main chamber with a relatively large volume, the third chamber 2C is a sub-chamber with a relatively small volume.

[0027] The contact portion 61 is a portion where the adsorption unit 62 inserted into the third chamber 2C from the opening 65 abuts. The contact portion 61 holds the adsorption unit 62 by coming into contact with the adsorption unit 62. The contact portion 61 is used to position the adsorption unit 62 so that a conversion space 64 is formed on the back side (the left side in FIG. 3) of the insertion direction of the adsorption unit 62. The conversion space 64 will be described later.

[0028] The adsorption unit 62 includes, for example, an activated carbon unit. Examples of the activated carbon unit include granular activated carbon, formed activated carbon molded into a monolith shape or a honeycomb shape, and fibrous activated carbon molded into a sheet shape, a rectangular parallelepiped shape, a cylindrical shape, a polygonal column shape, etc. Note that the adsorption unit 62 may have other forms as long as it is unitized.

[0029] In the above-described first chamber 2A and second chamber 2B, the main flow direction of the gas (hereinafter simply referred to as the flow direction) is the direction from the first filters 32 and 38 toward the second filters 33 and 54, or the opposite direction (i.e., the vertical direction in FIG. 2). However, in the third chamber 2C, a conversion space 64 in which the flow direction is converted is provided. In this conversion space 64, the gas is converted so that the flow direction is the direction toward the lid portion 70 or the opposite direction. That is, in the third chamber 2C, the flow direction is the direction from the conversion space 64 toward the lid portion 70 or the opposite direction. In other words, the flow direction in the third chamber 2C intersects the flow direction in the first chamber 2A and the second chamber 2B. That is, the flow direction in the third chamber 2C is the left-right direction orthogonal to the vertical direction in FIG. 2.

[0030] Here, as shown in FIG. 2, let the cross-sectional area of the space in the second chamber 2B where the adsorbent 43 is disposed be D2, and the cross-sectional area of the adsorption unit 62 disposed in the third chamber 2C be D3. However, these cross-sectional areas are the cross-sectional areas in the flow direction. In the present embodiment, the cross-sectional area D3 of the adsorption unit 62 is configured to be larger than the cross-sectional area D2 of the space in the second chamber 2B where the adsorbent 43 is disposed.

[0031] The filter 63 is disposed on the lid portion 70 side (the right side in FIG. 3) of the adsorption unit 62. The adsorption unit 62 is configured such that the surface on the filter 63 side is flush with the surface on the lid portion 70 side of the step portion 68A. That is, the height along the insertion direction of the adsorption unit 62 matches the height from the contact portion 61 to the step portion 68A in the auxiliary chamber portion 60.

[0032] The filter 63 is set to be in a state of receiving a pressing force from the lid portion 70 when the lid portion 70 is attached to the auxiliary chamber portion 60. Therefore, the suction unit 62 is held so as to be difficult to move by the pressing force from the filter 63 and the reaction force from the contact portion 61.

[0033] The holding portion 68 is a portion that holds the outer peripheral portion around the insertion direction of the suction unit 62 (for example, the top and bottom of the suction unit 62 in FIG. 3). The outer peripheral portion around the insertion direction is, in other words, the outer peripheral portion parallel to the gas flow direction in the suction unit 62. The inner surface of the holding portion 68 is configured in a cylindrical shape along the outer peripheral shape of the suction unit 62. With these configurations, the outer peripheral portion around the insertion direction of the suction unit 62 is configured to contact the holding portion 68 of the main body case 2.

[0034] The large-diameter portion 69 is disposed so as to surround the lid portion 70 at a position separated from the holding portion 68 on the side opposite to the suction unit 62 (that is, on the outer peripheral side with respect to the holding portion 68). That is, the large-diameter portion 69 has an outer diameter larger than the outer diameter of the holding portion 68.

[0035] The stepped portion 68A is a portion that constitutes a step connecting the holding portion 68 and the large-diameter portion 69. The stepped portion 68A constitutes a surface perpendicular to the holding portion 68 and the large-diameter portion 69. The inner surface (the right surface in FIG. 3) of the stepped portion 68A is the joint surface between the main body case 2 and the lid portion 70.

[0036] The opening 65 is a portion configured to communicate the third chamber 2C and the atmosphere. The opening 65 is the end portion of the large-diameter portion 69 on the side opposite to the stepped portion 68A. The lid portion 70 closes at least a part of the opening 65. As shown in FIG. 3, the lid portion 70 includes a disk-shaped main body portion 71 and a pipe portion 72 connected to the main body portion 71. The open end of the pipe portion 72 constitutes the atmosphere port 23. A seal member 78 is disposed between the outer peripheral large-diameter portion 69 of the lid portion 70. The seal member 78 is configured to close the entire circumference between the opening 65 and the lid portion 70. The seal member 78 is an annular member. The annular shape includes a circular shape, an elliptical shape, a polygonal shape, etc., and is a shape in which the entire circumference of the hole is surrounded.

[0037] For example, an O-ring can be adopted as the seal member 78. The outer peripheral portion of the lid portion 70 at the opening 65 is closed without a gap by the seal member 78. However, the lid portion 70 is provided with an atmosphere port 23 communicating with the atmosphere. The opening 65 is in an open state at the atmosphere port 23.

[0038] Note that any module such as an ELCM (i.e., Evaporative Leak Check Module) may be connected to the atmosphere port 23. The ELCM is a module for performing a leak inspection of the evaporative fuel processing device 1A.

[0039] The lid portion 70 is configured to be fixed to the main body case 2 by a snap-fit structure 80A. The snap-fit structure 80A is a structure that adopts a method of fixing by fitting a convex portion into a concave portion by utilizing the elasticity of the material. In the present embodiment, the lid portion 70 is attached to the main body case 2 by engaging the first engaging portion 66A and the second engaging portion 73A. The first engaging portion 66A is a concave portion disposed on the outer peripheral portion of the large-diameter portion 69 in the main body case 2. The second engaging portion 73A is a convex portion disposed on the outer peripheral portion of the lid portion 70.

[0040] With such a configuration, when the lid portion 70 is inserted along the large-diameter portion 69, the second engaging portion 73A of the lid portion 70 bends toward the inner peripheral side. Then, when the second engaging portion 73A fits into the first engaging portion 66A of the main body case 2, the bending of this portion is eliminated, and the engaging state between the first engaging portion 66A and the second engaging portion 73A is maintained. That is, the lid portion 70 is fixed to the main body case 2. In the present embodiment, the lid portion 70 and the main body case 2 are fixed using four identical snap-fit structures 80A.

[0041] Here, in the evaporation fuel processing device 1A, the lid portion 70 is attached to the main body case 2 while pressing the adsorption unit 62 via the filter 63. Therefore, the lid portion 70 and the adsorption unit 62 are arranged close to each other. In other words, the lid portion 70 is arranged on the movement path (that is, on the opening 65 side with respect to the adsorption unit 62) when the adsorption unit 62 moves toward the opening 65 side. Further in other words, the lid portion 70 has a function of suppressing the movement of the adsorption unit 62 by pressing the adsorption unit 62 from the opening 65 side.

[0042] [1-2. Effect] According to the embodiment described in detail above, the following effects can be obtained. (1a) The evaporation fuel processing device 1A includes a main body case 2 and a lid portion 70. The main body case 2 includes a plurality of adsorption chambers 2A to 2C, an adsorption unit 62, and an opening 65. The plurality of adsorption chambers 2A to 2C are each configured to accommodate an adsorbent. The adsorption unit 62 is an aggregate of adsorbents arranged in at least the third chamber 2C that communicates with the atmosphere among the plurality of adsorption chambers 2A to 2C. The opening 65 is configured to communicate the third chamber 2C with the atmosphere. The lid portion 70 closes at least a part of the opening 65 and is configured to be fixed to the main body case 2 by a snap-fit structure 80A. The lid portion 70 and the adsorption unit 62 are arranged close to each other.

[0043] According to such a configuration, when fixing the lid portion 70 and the main body case 2, since the snap fit structure 80A is used, compared with the case of using vibration welding, vibration during fixing is less likely to be transmitted to the suction unit 62. Therefore, in the configuration where the lid portion 70 and the suction unit 62 are arranged close to each other, damage to the suction unit 62 can be suppressed.

[0044] (1b) In one aspect of the present disclosure, the outer peripheral portion of the suction unit 62 is configured to contact the main body case 2. According to such a configuration, since the outer peripheral portion of the suction unit 62 contacts the main body case 2, a larger cross-sectional area of the flow path can be ensured.

[0045] (1c) In one aspect of the present disclosure, the main body case 2 includes a holding portion 68, a large-diameter portion 69, and a stepped portion 68A. In the holding portion 68, the suction unit 62 is held. The large-diameter portion 69 is disposed so as to surround the lid portion 70 at a position spaced farther from the holding portion 68 on the outer peripheral side of the suction unit 62, and is configured to be connected to the lid portion 70 by the snap fit structure 80A. The stepped portion 68A constitutes a step connecting the holding portion 68 and the large-diameter portion 69.

[0046] According to such a configuration, when connecting the main body case 2 and the lid portion 70 using the snap fit structure 80A, if an impact occurs, this impact can be absorbed by the stepped portion 68A. Therefore, it is possible to make it difficult for the impact to be transmitted to the holding portion 68 and the suction unit 62.

[0047] (1d) One aspect of the present disclosure further includes a seal member 78 configured to block the entire circumference between the opening 65 and the lid portion 70. According to such a configuration, since the seal member 78 blocks the entire circumference between the opening 65 and the lid portion 70, it is possible to easily maintain airtightness at the opening 65 without performing welding or the like.

[0048] (1e) In one aspect of the present disclosure, the third chamber 2C may be configured to have a volume smaller than that of the second chamber 2B, which is the adsorption chamber communicating with the third chamber 2C among the plurality of adsorption chambers 2A to 2C. The cross-sectional area of the adsorption unit 62 in the gas flow direction in the third chamber 2C may be configured to be larger than the cross-sectional area of the adsorption unit 62 in the gas flow direction in the second chamber 2B.

[0049] According to such a configuration, since the cross-sectional area of the adsorption unit 62 is set larger in the third chamber 2C closer to the opening 65, the evaporated fuel can be made less likely to leak.

[0050] [2. Other Embodiments] As described above, the embodiments of the present disclosure have been described. However, the present disclosure is not limited to the foregoing embodiments and can be implemented in various modifications.

[0051] (2a) Any snap-fit structure can be adopted for the snap-fit structure 80A employed in the above embodiment. For example, a snap-fit structure 80B may be adopted as in the evaporated fuel treatment device 1B of the first modified example shown in FIGS. 4A and 4B.

[0052] In the snap-fit structure 80A of the above embodiment, the main body case 2 side is provided with a first engaging portion 66A as a recess, and the lid portion 70 side is provided with a second engaging portion 73A as a protrusion. In contrast, in the snap-fit structure 80B of the first modified example, the main body case 2 side is provided with a first engaging portion 66B as a protrusion, and the lid portion 70 side is provided with a second engaging portion 73B as a recess.

[0053] In such a configuration, the first engaging portion 66B on the main body case 2 side is bent to engage with the second engaging portion 73B on the lid portion 70 side. At this time, since the step portion 68A is provided on the main body case 2, the first engaging portion 66B is more likely to bend than when the step portion 68A is not provided. Further, since the step portion 68A can absorb bending and vibration, it is possible to make it difficult for the pressing force and vibration generated when the lid portion 70 is attached to the main body case 2 to be transmitted to the adsorption unit 62.

[0054] (2b) Further, for example, a snap-fit structure 80C may be adopted as in the evaporation fuel treatment device 1C of the second modification shown in FIGS. 5A and 5B. The snap-fit structure 80C of the second modification includes a first engaging portion 66C as a recess on the main body case 2 side and a second engaging portion 73C as a protrusion on the lid portion 70 side, similar to the snap-fit structure 80A of the above embodiment. However, in the snap-fit structure 80A of the above embodiment, a protruding portion protruding further to the outer peripheral side from the large-diameter portion 69 constitutes the first engaging portion 66A, while in the snap-fit structure 80C of the second modification, a hole formed on the outer periphery of the large-diameter portion 69 constitutes the first engaging portion 66C. According to such a configuration, the snap-fit structure 80C can be realized without providing a protruding portion on the large-diameter portion 69.

[0055] (2c) In the above embodiment, an O-ring is adopted as the seal member 78, but the configuration is not limited to this. For example, as in the evaporation fuel treatment device 1D of the third modification shown in FIGS. 6A and 6B, instead of the O-ring, a seal member 78A which is a finned ring may be adopted. The finned ring includes a ring-shaped member and a plurality of fins protruding and extending on the outer peripheral side of the member, and the ring-shaped member and the plurality of fins are integrally formed.

[0056] (2d) In the above embodiment, the lid portion 70 is configured to be attached in a state where the adsorption unit 62 is inserted into the main body case 2, but the configuration is not limited to this. For example, as in the evaporation fuel treatment device 1E of the fourth modification shown in FIGS. 7A and 7B, instead of the lid portion 70, a lid portion 70A may be provided, and the adsorption unit 62 may be disposed inside the lid portion 70A.

[0057] According to such a configuration, the adsorption unit 62 can be inserted into the lid portion 70A, and the lid portion 70A can be configured to be attached to the main body case 2 in a state where the adsorption unit 62 and the lid portion 70A are disposed in proximity. According to this configuration, the state where the adsorption unit 62 and the lid portion 70A are disposed in proximity can be maintained before the lid portion 70A is attached to the main body case 2.

[0058] (2e) In the above embodiment, the direction of the atmosphere port 23 is configured to be different from the directions of the other ports 21 and 22, particularly in a direction away from the other ports 21 and 22. However, the present invention is not limited to this configuration. For example, as in the evaporation fuel processing device 1E of the fifth modification shown in FIG. 8A, the direction of the atmosphere port 23 may be configured to be the same as the directions of the other ports 21 and 22.

[0059] (2f) Further, instead of the lid portion 70, a lid portion 70B may be provided as in the evaporation fuel processing device 1F of the sixth modification shown in FIG. 8B. In the lid portion 70B, the atmosphere port 23 is configured to communicate with the main body case 2 via a direction changing portion 75. The direction changing portion 75 has a substantially rectangular parallelepiped shape, and a space for gas to flow is formed inside. One surface of the substantially rectangular parallelepiped shape of the direction changing portion 75 faces the main body portion 71 (i.e., the substantially circular portion) of the lid portion 70B, and the pipe portion 72 is arranged at an arbitrary position on any of the four side surfaces adjacent to this surface so that the atmosphere port 23 faces in a direction perpendicular to the side surface. In the direction changing portion 75, it is sufficient that the side surface on which the atmosphere port 23 is arranged and the direction of the atmosphere port 23 intersect, and they do not necessarily need to be perpendicular. Further, the direction changing portion 75 is configured to connect the main body portion 71 of the lid portion 70B and the pipe portion 72 while ensuring airtightness.

[0060] (2g) In the above embodiment, the sub chamber portion 60 has a substantially cylindrical internal space and includes a substantially cylindrical adsorption unit 62 that matches the shape of this internal space. However, the present invention is not limited to this configuration. For example, as in the evaporation fuel processing device 1H of the seventh modification shown in FIG. 9A, instead of the sub chamber portion 60, a sub chamber portion 60C may be provided. The sub chamber portion 60C includes a holding portion 68C that forms a part of the outer peripheral surface of a cone. The holding portion 68C is configured in a tapered shape such that the inner diameter expands as it approaches the lid portion 70. The adsorption unit 62 is configured to have substantially the same shape as the shape of the portion of the holding portion 68C that is configured in a tapered shape. That is, the adsorption unit 62 is configured in a frustum of a cone shape.

[0061] (2h) In the above-described embodiment, the adsorption unit 62 is configured such that the surface on the filter 63 side is flush with the surface on the lid portion 70 side in the stepped portion 68A. However, the present invention is not limited to this configuration. For example, like the evaporation fuel processing apparatus 1I of the eighth modification shown in FIG. 9B, the surface on the filter 63 side of the adsorption unit 62 may be configured to protrude by a length Δ from the surface on the lid portion 70 side in the stepped portion 68A. According to such a configuration, since the surface on the filter 63 side of the adsorption unit 62 protrudes, the lid portion 70 can be configured to more easily press the adsorption unit 62.

[0062] (2i) A plurality of functions of one component in the above-described embodiment may be realized by a plurality of components, or one function of one component may be realized by a plurality of components. Further, a plurality of functions of a plurality of components may be realized by one component, or one function realized by a plurality of components may be realized by one component. Further, a part of the configuration of the above-described embodiment may be omitted. Further, at least a part of the configuration of the above-described embodiment may be added to or replaced with the configuration of another above-described embodiment.

[0063] (2j) In addition to the evaporation fuel processing apparatus 1A described above, the present disclosure can also be realized in various forms such as a system including the evaporation fuel processing apparatus 1A as a component and an evaporation fuel processing method.

[0064] [Technical Idea Disclosed in this Specification] [Item 1] An evaporation fuel processing apparatus, comprising a main body case and a lid portion, wherein the main body case includes a plurality of adsorption chambers configured to accommodate an adsorbent respectively, an adsorption unit which is an aggregate of the adsorbent and is disposed in at least the atmospheric-side adsorption chamber communicating with the atmosphere among the plurality of adsorption chambers, and an opening configured to communicate the atmospheric-side adsorption chamber with the atmosphere, and is provided with The lid portion closes at least a part of the opening portion and is configured to be fixed to the main body case by a snap fit structure. The lid portion and the adsorption unit are arranged in proximity to each other. An evaporation fuel treatment device configured as described above. [Item 2] The evaporation fuel treatment device according to Item 1, wherein an outer peripheral portion of the adsorption unit abuts against the main body case. An evaporation fuel treatment device configured as described above. [Item 3] The evaporation fuel treatment device according to Item 1 or Item 2, wherein the main body case has a holding portion for holding the adsorption unit, a large-diameter portion that is arranged so as to surround the lid portion at a position separated from the holding portion toward the outer peripheral side of the holding portion and is configured to be connected to the lid portion by the snap fit structure, and a stepped portion that forms a step for connecting the holding portion and the large-diameter portion. An evaporation fuel treatment device including the above. [Item 4] The evaporation fuel treatment device according to any one of Items 1 to 3, further including a seal member configured to close the entire circumference between the opening portion and the lid portion. An evaporation fuel treatment device further including the above. [Item 5] The evaporation fuel treatment device according to any one of Items 1 to 4, wherein the atmosphere-side adsorption chamber is a sub-chamber configured to have a smaller volume than a main chamber that is an adsorption chamber communicating with the atmosphere-side adsorption chamber among the plurality of adsorption chambers, and a cross-sectional area of the adsorption unit in a gas flow direction in the sub-chamber is configured to be larger than a cross-sectional area of the adsorption unit in a gas flow direction in the main chamber. An evaporation fuel treatment device.

Explanation of Reference Numerals

[0065] 1A to 1I... Evaporative fuel treatment device, 2... Main body case, 2A... First chamber, 2B... Second chamber, 2C... Third chamber, 2C... Third chamber, 4... Adsorbent, 21... Charge port, 22... Purge port, 23... Atmosphere port, 40, 43... Adsorbent, 60, 60C... Sub-chamber part, 61... Contact part, 62... Adsorption unit, 63... Filter, 64... Conversion space, 64... Adsorption unit, 65... Opening, 66A to 66C... First engagement part, 68... Holding part, 68A... Step part, 69... Large diameter part, 70, 70A to 70C... Cover part, 73A to 73C... Second engagement part, 78... Seal member, 78... O-ring, 80A to 80C... Snap fit structure.

Claims

1. An evaporation fuel treatment device, comprising a main body case and a lid portion, wherein the main body case has a plurality of adsorption chambers configured to accommodate an adsorbent respectively, an adsorption unit which is an aggregate of the adsorbents and is disposed in at least an atmospheric-side adsorption chamber communicating with the atmosphere among the plurality of adsorption chambers, and an opening configured to communicate the atmospheric-side adsorption chamber with the atmosphere, and the lid portion closes at least a part of the opening and is configured to be fixed to the main body case by a snap-fit structure, the lid portion and the adsorption unit are disposed adjacent to each other, the main body case has a holding portion for holding the adsorption unit, a large-diameter portion disposed so as to surround the lid portion at a position separated from the outer peripheral side of the holding portion with respect to the holding portion and configured to be connected to the lid portion by the snap-fit structure, and a stepped portion forming a step for connecting the holding portion and the large-diameter portion, and is an evaporation fuel treatment device comprising these.

2. The evaporation fuel treatment device according to Claim 1, wherein an outer peripheral portion of the adsorption unit is configured to contact the main body case. and is an evaporation fuel treatment device.

3. The evaporation fuel treatment device according to Claim 1, further comprising a seal member configured to close the entire circumference between the opening and the lid portion. and is an evaporation fuel treatment device.

4. The evaporation fuel treatment device according to Claim 1, wherein the atmospheric-side adsorption chamber is a sub-chamber configured to have a smaller volume than a main chamber which is an adsorption chamber communicating with the atmospheric-side adsorption chamber among the plurality of adsorption chambers, and a cross-sectional area of the adsorption unit in a gas flow direction in the sub-chamber is configured to be larger than a cross-sectional area of the adsorption unit in a gas flow direction in the main chamber. and is an evaporation fuel treatment device.

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