JP2009222045A - Vaporized fuel treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent or reduce the breakage of a shoulder portion of an adsorbent due to holding members elastically holding the adsorbent in a case. <P>SOLUTION: A vaporized fuel treatment apparatus comprises the adsorbent 34 having a honeycomb structure capable of adsorbing and desorbing vapor contained in vaporized fuel gas, a sub case body 16 of a case configured to house the first adsorbent 34 therein, and two holding members 37 for elastically holding the adsorbent 34 in the sub case body 16. The holding member 37 has an outer peripheral face holding part 45 for contacting the outer peripheral face of the adsorbent 34 and an end face holding part 47 for contacting the end face of the adsorbent 34. The holding member 37 has a release recessed portion 49 corresponding to the shoulder portion 34a formed between the outer peripheral face and the end face of the adsorbent 34. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention mainly relates to a fuel vapor processing apparatus mounted on a vehicle.

A fuel vapor processing apparatus according to a conventional example will be described. FIG. 26 is a cross-sectional view showing the evaporated fuel processing apparatus.
As shown in FIG. 26, the evaporated fuel processing apparatus 201 includes an adsorbent 202 having a honeycomb structure capable of adsorbing and desorbing vapor contained in the evaporated fuel gas, a case 203 for accommodating the adsorbent 202, Are provided with a pair of holding members 204 and 205 for elastically holding the adsorbent body 202. The holding member 204 disposed on the insertion side (the right side in FIG. 26) of the adsorbent 202 with respect to the case 203 is in contact with the outer peripheral surface holding portion 204 a that contacts the outer peripheral surface of the adsorbent 202 and the end surface of the adsorbent 202. It is formed in an annular shape having an end surface holding portion 204b. In addition, the holding member 205 disposed on the other side (left side in FIG. 26) of the adsorbent body 202 is formed in an annular shape that contacts the outer peripheral surface of the adsorbent body 202. Further, a filter 206 made of a non-woven fabric covering the entire end face is disposed on the end face on the other side (left side in FIG. 26) of the adsorbent body 202. Such an evaporative fuel processing apparatus 201 is described in, for example, Patent Document 1.

Japanese Patent Laying-Open No. 2004-1000069 (see [0082] and FIG. 17)

By the way, since the adsorbent 202 has low mechanical strength, the shoulder 202a formed by the outer peripheral surface and the axial end surface (hereinafter referred to as “end surface”) is particularly fragile and easily damaged. For this reason, when the holding member 204 having the outer peripheral surface holding portion 204 a that contacts the outer peripheral surface of the adsorbent body 202 and the end surface holding portion 204 b that contacts the end surface of the adsorbent body 202 is used, the holding member 204 is attached to the adsorbent body 202. There is a problem in that the shoulder 202a of the adsorbent body 202 is easily damaged during mounting.
The problem to be solved by the present invention is to provide an evaporative fuel processing apparatus capable of preventing or reducing damage to the shoulder portion of the adsorbent by the holding member that elastically holds the adsorbent in the case.

The above-mentioned problem can be solved by an evaporative fuel processing apparatus having the gist of the configuration described in the appended claims.
That is, according to the fuel vapor processing apparatus described in claim 1, the outer peripheral surface holding portion of the holding member is in contact with the outer peripheral surface of the adsorbent, and the end surface holding portion of the holding member is the adsorbent of the adsorbent. By contacting the end face, the adsorbent can be elastically held in the case. By the way, since the relief recess provided in the holding member corresponds to the shoulder formed by the outer peripheral surface and the end surface of the adsorbent, contact of the holding member with the shoulder can be avoided. Thereby, damage to the shoulder portion of the adsorbent by the holding member can be prevented or reduced. The “adsorbent” in the present specification refers to an adsorbent having a breathability of a honeycomb (also referred to as “monolith”) structure in which activated carbon and a binder are kneaded.

  According to the fuel vapor processing apparatus described in claim 2 of the claims, the outer peripheral surface holding material provided in the holding member contacts the outer peripheral surface of the adsorbent and the end surface holding material provided in the holding member is adsorbed. By contacting the end surface of the body, the adsorbent can be elastically held in the case. By the way, since the end face holding member has lower elasticity than that of the outer peripheral face holding member, the external force applied to the shoulder portion of the adsorbent can be reduced. Thereby, damage to the shoulder portion of the adsorbent by the holding member can be prevented or reduced.

  According to the fuel vapor processing apparatus described in claim 3, the outer peripheral surface holding portion provided in the holding member contacts the outer peripheral surface of the adsorbent, and the end surface holding portion provided in the holding member is adsorbed. By contacting the end surface of the body, the adsorbent can be elastically held in the case. By the way, since the outer peripheral surface holding material and the end surface holding material are provided independently, and the end surface holding material has elasticity lower than that of the outer peripheral surface holding material, the external force applied to the shoulder portion of the adsorbent is reduced. be able to. Thereby, damage to the shoulder portion of the adsorbent by the holding member can be prevented or reduced.

  According to the fuel vapor processing apparatus described in claim 4, the end face holding member is a member that covers the end face of the adsorbent as a whole and has air permeability. Therefore, the end face holding material can ensure the air permeability to the adsorbent while protecting the end face of the adsorbent as a whole.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[Example 1]
A first embodiment of the present invention will be described. For convenience of explanation, after the outline of the evaporated fuel processing apparatus is explained, the holding structure of the adsorbent will be explained. FIG. 1 is a side view showing the fuel vapor processing apparatus with a part broken away.
As shown in FIG. 1, the case 12 included in the fuel vapor processing apparatus 10 includes a main case body 14 that is a main body, a sub case body 16 that is a separate body from the main case body 14, and a main case body 14 and a sub case. A communication pipe 18 that communicates with the case body 16 is formed. For convenience of explanation, the upper, lower, left, and right sides of the case are the same as those in FIG.

  The main case body 14 is formed in a hollow box shape. The main case body 14 includes a case main body 20 that closes the upper surface and opens the lower surface, and a lid plate 21 that closes the lower surface opening of the case main body 20. A tank port 23, a purge port 24, and a connection port 25 are provided on the upper surface of the main case body 14. The tank port 23 is connected to an evaporated fuel gas passage (not shown) that communicates with the gas phase portion of the fuel tank. The evaporated fuel gas generated in the fuel tank is introduced into the main case body 14 through the evaporated fuel gas passage and the tank port 23. The evaporated fuel gas is mainly composed of a mixture of a hydrocarbon compound (hereinafter referred to as “vapor”) and air.

  The purge port 24 is connected to a purge passage (not shown) communicating with the intake pipe of the engine. A purge control valve is provided in the middle of the purge passage, and purge control related to vapor desorption is performed by controlling the purge control valve by a control device during engine operation. One end of the communication pipe 18 is connected to the connection port 25.

  The main case body 14 is filled with granular adsorbents (not shown) made of activated carbon. The adsorbent is for adsorbing vapor contained in the evaporated fuel gas introduced into the main case body 14 from the tank port 23, and is composed of granulated coal, crushed coal, or the like.

  The sub case body 16 includes a hollow cylindrical case tube portion 27 and a lid plate portion 28 that closes the upper surface opening of the case tube portion 27. The cover plate portion 28 is provided with a connection port 30 communicating with the sub case body 16. The other end of the communication pipe 18 is connected to the connection port 30. Thereby, the inside of the main case body 14 and the inside of the sub case body 16 are communicated via the communication pipe 18. Further, an atmospheric port 31 for reducing the diameter is provided at the lower end portion of the sub case body 16. An atmospheric passage (not shown) communicating with the atmospheric side is connected to the atmospheric port 31. Further, a cover cylinder portion 32 surrounding the peripheral portion of the atmospheric port 31 is provided at the lower end portion of the sub case body 16. The sub case body 16 is attached to the side surface of the main case body 14. In addition, the case cylinder part 27 is formed in the gentle taper shape which makes the internal diameter by the side of the lid plate 21 larger than the internal diameter by the side of the air | atmosphere port 31. FIG.

An adsorbent 34 having a honeycomb structure is accommodated in the case cylinder portion 27 of the sub case body 16. FIG. 2 is a perspective view showing the adsorbent.
As shown in FIG. 2, the adsorbent 34 has a large number of gas passage holes 35 that are cylindrical and extend in the axial direction (vertical direction in FIG. 1). Further, the adsorbent 34 can adsorb and desorb vapor contained in the evaporated fuel gas when the evaporated fuel gas flows in the gas passage hole 35. Further, a corner portion formed by the outer peripheral surface and the end surface of the adsorbent 34 is referred to as a shoulder portion 34a. The adsorbent 34 is obtained by mixing a material having a high heat capacity such as ceramic and an adsorbent such as activated carbon at a predetermined ratio, then forming the adsorbent 34 into a predetermined shape (for example, a cylindrical shape), and then firing it.

  As shown in FIG. 1, the adsorbent 34 is elastically held by a pair of upper and lower holding members 38 and 37 in the case cylinder portion 27 of the sub case 16. The lower holding member 37 is in proximity to or in contact with the air-permeable filter 40 provided at the upper end of the atmospheric port 31. On the upper holding member 38, a pressing member 42 having a ring shape is placed concentrically. Further, the cover plate portion 28 is mounted on the upper surface opening of the case tube portion 27 by welding, bonding or the like after a pressing spring 43 made of a coil spring is disposed concentrically on the pressing member 42. The holding spring 43 elastically presses the adsorbent 34. A structure for holding the adsorbent 34 by the holding members 37 and 38 will be described later.

  Next, the operation of the evaporated fuel processing apparatus 10 (see FIG. 1) will be described. The evaporated fuel gas generated in the fuel tank is introduced into the main case body 14 through the tank port 23. The evaporated fuel gas passes through the gap between the adsorbents in the main case body 14, and then flows into the sub case body 16 via the connection port 25, the communication pipe 18, and the connection port 30. The evaporated fuel gas passes through the gas passage hole 35 (see FIG. 2) of the adsorbent 34 and is then released from the atmosphere port 31 to the atmosphere side. At that time, the vapor in the evaporated fuel gas is adsorbed by the adsorbent in the main case body 14 and the rest is adsorbed by the adsorbent 34 in the sub case body 16. As a result, air that does not contain a fuel component is finally released from the atmospheric port 31 to the atmospheric side.

  On the other hand, during purge control during engine operation, if the purge control valve is opened by a control device (not shown), the negative pressure in the intake pipe is introduced into the main case body 14 via the purge port 24, thereby The air inside is sucked into the sub case body 16 from the atmospheric port 31 of the sub case body 16. The air passes through the gas passage hole 35 of the adsorbent 34, passes through the communication pipe 18, passes through the gap between the adsorbents in the main case body 14, and then purges from the purge port 24 into the intake pipe. Is done. At that time, vapor is desorbed from the adsorbent and the adsorbent 34 and flows into the intake pipe.

  Next, the holding structure of the adsorbent 34 in the evaporated fuel processing apparatus 10 will be described. 3 is a cross-sectional view showing a portion III in FIG. 1, FIG. 4 is a cross-sectional view showing a portion IV in FIG. 1, FIG. 5 is an end view showing an adsorbent with a first holding member, and FIG. It is a sectional side view which shows the principal part of an adsorption body. For convenience of explanation, in FIG. 1, the lower holding member 37 is referred to as a first holding member 37, and the upper holding member 38 is referred to as a second holding member 38. Since the first holding member 37 and the second holding member 38 have basically the same configuration, the first holding member 37 will be described, and the second holding member 38 will be described as the first holding member. The same reference numerals are assigned to the same parts as those in FIG.

  As shown in FIG. 5, the 1st holding member 37 is formed in the annular | circular shape with the rubber-like elastic material. As shown in FIG. 6, the first holding member 37 has an outer peripheral surface holding portion 45 that contacts the outer peripheral surface of the adsorbent body 34, and an end surface holding portion 47 that contacts the end surface of the adsorbent body 34. The cross section is formed in an L shape. Further, an escape recess 49 having an L-shaped cross section corresponding to the shoulder 34 a of the adsorbent 34 is provided on the inner peripheral portion of the holding member 37. The escape recess 49 is continuous over the entire circumference of the holding member 38. Further, a tapered cylindrical lip seal portion 51 is formed at the free end portion (lower end portion in FIG. 6) of the outer peripheral surface holding portion 45. The lip seal portion 51 is formed in a lip shape in which the outer diameter gradually increases in the direction opposite to the insertion direction of the adsorbent 34 (upward in FIG. 3 and downward in FIG. 6). Note that a non-breathable rubber-like elastic material is used for the first holding member 37.

  The second holding member 38 is disposed so as to be vertically symmetrical with the first holding member 37 with the adsorbent 34 interposed therebetween (see FIGS. 3 and 4). Therefore, the outer diameter of the lip seal portion 51 of the second holding member 38 gradually increases from the outer peripheral surface of the outer peripheral surface holding portion 45 in the direction opposite to the insertion direction of the adsorbent 34 (upward in FIG. 4). It is formed in a taper shape.

  Next, when the adsorbing body 34 is inserted into the case cylinder portion 27 of the sub case body 16, the first holding member 37 is provided at the insertion side (lower side in FIG. 1) end of the adsorbing body 34. Is elastically attached by fitting (see FIGS. 3, 5 and 6). Further, a second holding member 37 is elastically attached to the end of the adsorbent 34 opposite to the insertion side (upper side in FIG. 1) by fitting (see FIG. 4).

  The adsorbing body 34 equipped with both holding members 37 and 38 is inserted into the case cylinder portion 27 of the sub case body 16 prior to the attachment of the lid plate portion 28. Then, as shown in FIG. 3, in a state where a gap is formed between the outer peripheral surface of the outer peripheral surface holding portion 45 of the first holding member 37 and the inner peripheral surface of the case cylinder portion 27, The large-diameter side end portion elastically contacts the inner peripheral surface of the case tube portion 27. Further, as shown in FIG. 4, in the state where a gap is formed between the outer peripheral surface of the outer peripheral surface holding portion 45 of the second holding member 37 and the inner peripheral surface of the case cylinder portion 27, The large-diameter side end portion elastically contacts the inner peripheral surface of the case tube portion 27. Thereby, the adsorbent 34 is elastically held by the holding members 37 and 38 in the case cylinder portion 27. At the same time, the case cylinder 27 and the adsorbent 34 are elastically sealed by the holding members 37 and 38. Note that the end surface holding portion 47 of the first holding member 37 is brought close to or in contact with the filter 40 (see FIG. 3). An annular pressing portion 42a of the pressing member 42 is brought into contact with the end surface holding portion 47 of the second holding member 38 (see FIG. 4).

  According to the fuel vapor processing apparatus 10 described above, the outer peripheral surface holding portions 45 of both the holding members 37 and 38 are in contact with the outer peripheral surface of the adsorbent body 34, and the end surface holding portions 47 of the holding members 37 and 38 are the adsorbent body 34. By contacting each of the end surfaces, the adsorbent 34 can be elastically held in the case 12 (specifically, the sub case body 16). By the way, the relief recesses 49 provided in both the holding members 37 and 38 correspond to the shoulder portion 34a formed by the outer peripheral surface and the end surface of the adsorbent body 34, so that the contact of the both holding members 37 and 38 with the shoulder portion 34a is avoided. can do. As a result, damage to the shoulder portion 34a of the adsorbent 34 by both the holding members 37 and 38 can be prevented or reduced. Further, in this embodiment, the main case body 14 and the communication pipe 18 can be omitted, and the evaporative fuel processing apparatus 10 can be constituted by the sub case body 16 provided with the adsorbing body 34.

[Example 2]
A second embodiment of the present invention will be described. Since the present embodiment is a modification of the first embodiment, the changed portion will be described and redundant description will be omitted. Also, in the following embodiments, the changed parts will be described, and redundant description will be omitted. FIG. 7 is a side view showing the fuel vapor processing apparatus with a part broken away.
As shown in FIG. 7, the evaporative fuel processing apparatus (denoted by reference numeral 110) of the present embodiment omits the sub case body 16 and the communication pipe 18 in the first embodiment (see FIG. 1), and the main case body. A case tube portion 27 (same reference numeral) having the same configuration as the case tube portion 27 of the sub case body 16 in the first embodiment is formed on the side portion including the connection port 25 in the 14 case body 20. The atmospheric port 31 and the cover cylinder part 32 are directed to the upper surface side of the case body 20, and the end part on the opening side (cover plate part side) of the case cylinder part 27 is spaced from the cover plate 21 by a predetermined distance. Is open. Therefore, the inside of the case cylinder part 27 communicates with the inside of the case main body 20 through the gap on the lid plate 21 side.

In the central portion of the case tube portion 27 near the lower side, a pressing member 112 having a hole is mounted instead of the pressing member 42 in the first embodiment. The pressing member 112 has an annular pressing portion 112 a that abuts against the end surface holding portion 47 (see FIG. 4) of the second holding member 38, similar to the pressing member 42.
Further, a press plate 114 having air permeability is fitted into the lower surface opening of the case tube portion 27 so as to be movable up and down in a horizontal state. Between the pressing plate 114 and the lid plate 21, a lifting spring 115 made up of a coil spring that elastically pushes up each pressing plate 114 is interposed. In addition, a granular adsorbent 118 made of activated carbon is filled between the pressing member 112 and the pressing plate 114. Note that a breathable filter 116 is polymerized on the pressing plate 114.

[Example 3]
A third embodiment of the present invention will be described. In the present embodiment, the first holding member 37 in the first embodiment is modified. FIG. 8 is an end view showing the adsorbent with the first holding member mounted thereon, and FIG. 9 is a side sectional view showing the main part.
As shown in FIGS. 8 and 9, in this embodiment, a cross-shaped rib portion 53 is provided in the end surface holding portion 47 of the first holding member 37. Thus, by providing the rib part 53 in the end surface holding part 47, the end surface holding part 47 can be reinforced. In addition, the shape of the rib part 53 should just be a shape which reinforces the end surface holding | maintenance part 47, For example, various shapes like a single letter, a three-spoke shape, a mesh shape etc. can be considered other than a cross. The rib portion 53 can also be applied to the end surface holding portion 47 of the second holding member 38.

[Example 4]
Embodiment 4 of the present invention will be described. In this embodiment, the holding structure for the adsorbent 34 in the first embodiment is changed. 10 is a partially cutaway side view of the fuel vapor processing apparatus, FIG. 11 is a cross-sectional view showing the XI portion of FIG. 10, FIG. 12 is a cross-sectional view showing the XII portion of FIG. 10, and FIG. FIG. 14 is a side cross-sectional view showing the main part of the adsorbing body. For convenience of explanation, in FIG. 10, the lower holding member is referred to as a first holding member 55, and the upper holding member is referred to as a second holding member 56. Since the first holding member 55 and the second holding member 56 have basically the same configuration, the first holding member 55 will be described, and the second holding member 56 will be described as the first holding member. The same reference numerals are assigned to the same parts as those in FIG.

  As shown in FIGS. 13 and 14, the first holding member 55 in the present embodiment includes an outer peripheral surface holding member 58 that contacts the outer peripheral surface of the adsorbent member 34, and the outer peripheral surface holding member 58. And an end face holding member 60 that is held in contact with the end face. The outer peripheral surface holding member 58 is made of a non-breathable rubber-like elastic material. Further, the end surface holding member 60 is formed of a rubber-like elastic material having air permeability, for example, urethane foam, and has lower elasticity than that of the outer peripheral surface holding member 58. Further, the end surface holding member 60 is formed in a disc shape that covers the entire end surface of the adsorbent 34.

  The outer peripheral surface holding member 58 is formed in an annular shape. The outer peripheral surface holding member 58 has a main holding portion 58a that contacts the outer peripheral surface of the adsorbing body 34 and a cross section having a sub holding portion 58b that holds the end surface holding member 60 in contact with the end surface of the adsorbing member 34. It is formed in an L shape. Further, a tapered cylindrical lip seal portion 61 is formed at the free end portion (lower end portion in FIG. 14) of the main holding portion 58a. The lip seal portion 61 is formed in a lip shape in which the outer diameter gradually increases in the direction opposite to the insertion direction of the adsorbent 34 (upward in FIG. 11 and downward in FIG. 14).

  Further, the outer peripheral surface holding member 58 of the second holding member 56 is arranged so as to be vertically symmetrical with the outer peripheral surface holding member 58 of the first holding member 55 with respect to the adsorbent 34. Therefore, the lip seal portion 61 of the outer peripheral surface holding member 58 of the second holding member 56 is directed from the outer peripheral surface of the outer peripheral surface holding member 58 in the direction opposite to the insertion direction of the adsorbent 34 (upward in FIG. 12). It is formed in a tapered shape that gradually increases the outer diameter.

  Next, when the adsorbent 34 is inserted into the case cylinder portion 27 of the sub case 16, the first holding member 55 is provided at the insertion side (lower side in FIG. 10) end of the adsorbent 34. Be placed. That is, in the first holding member 55, the outer peripheral surface holding material 60 is aligned with the end surface on the insertion side (the lower side in FIG. 11, the upper side in FIG. 14) of the adsorbent body 34 in surface contact. 58 is elastically attached to the end portion of the adsorbing body 34 by fitting (see FIGS. 11, 13 and 14).

  Further, a second holding member 56 is arranged at the end opposite to the insertion side of the adsorbent 34 (upper side in FIG. 10) so as to be vertically symmetrical with the first holding member 55. That is, in the second holding member 56, the outer peripheral surface holding material 58 is adsorbed in a state where the end surface holding material 60 is aligned in surface contact with the end surface on the opposite side (upper side in FIG. 12) of the adsorbent 34. The end of the body 34 is elastically attached by fitting (see FIG. 12).

  The adsorbing body 34 fitted with both holding members 55 and 56 is inserted into the case cylinder portion 27 of the sub case body 16 prior to the attachment of the cover plate portion 28. Then, as shown in FIG. 11, in a state where a gap is formed between the outer peripheral surface of the main holding portion 58a of the outer peripheral surface holding member 58 of the first holding member 55 and the inner peripheral surface of the case cylinder portion 27, The large-diameter side end of the lip seal portion 61 elastically contacts the inner peripheral surface of the case tube portion 27. In addition, as shown in FIG. 12, in a state where a gap is formed between the outer peripheral surface of the main holding portion 58a of the outer peripheral surface holding member 58 of the second holding member 56 and the inner peripheral surface of the case tube portion 27, The large-diameter side end of the lip seal portion 61 elastically contacts the inner peripheral surface of the case tube portion 27. As a result, the adsorbent 34 is elastically held by the holding members 55 and 56 in the case cylinder portion 27. At the same time, the space between the case tube portion 27 and the adsorbent 34 is elastically sealed by the outer peripheral surface holding members 58 of the holding members 55 and 56. The sub-holding portion 58b of the outer peripheral surface holding member 58 of the first holding member 55 is brought close to or in contact with the filter 40 (see FIG. 11). Further, the pressing portion 42a of the pressing member 42 is brought into contact with the auxiliary holding portion 58b of the outer peripheral surface holding material 58 of the second holding member 56 (see FIG. 12).

  According to the fuel vapor processing apparatus 10 described above, the outer peripheral surface holding member 58 provided in both holding members 55 and 56 contacts the outer peripheral surface of the adsorbent 34 and the end face holding member 60 provided in both holding members 55 and 56 is adsorbed. By contacting the end surface of the body 34, the adsorbent 34 can be elastically held in the case 12 (specifically, the sub case body 16). By the way, since the end surface holding member 60 has elasticity lower than that of the outer peripheral surface holding member 58, the external force applied to the shoulder portion 34a of the adsorbent 34 can be reduced. As a result, damage to the shoulder portion 34a of the adsorbent 34 by both the holding members 55 and 56 can be prevented or reduced.

  Further, the end surface holding member 60 is a member that covers the entire end surface of the adsorbent 34 and has air permeability. Therefore, the end face holding member 60 can ensure air permeability to the adsorbing body 34 while protecting the end face of the adsorbing body 34 as a whole. Further, since the end surface holding member 60 faces the end surface of the adsorbent body 34 as a whole, it is possible to avoid a decrease in the adsorption performance of the adsorbent body 34 due to the non-breathable member facing the end surface of the adsorbent body 34. Can do.

[Example 5]
Embodiment 5 of the present invention will be described. This embodiment is a modification of the second embodiment. FIG. 15 is a side view showing the fuel vapor processing apparatus with a part broken away.
As shown in FIG. 15, the evaporative fuel processing apparatus 110 of the present embodiment changes the first holding member 37 in the second embodiment (see FIG. 7) to the first holding member 55 in the fourth embodiment. The second holding member 38 in the second embodiment is changed to the second holding member 56 in the fourth embodiment.

[Example 6]
Embodiment 6 of the present invention will be described. In the present embodiment, a change is made to the outer peripheral surface holding member 58 of the first holding member 55 in the fourth embodiment. FIG. 16 is an end view showing the adsorbent with the first holding member mounted thereon, and FIG. 17 is a side sectional view showing the main part.
As shown in FIGS. 16 and 17, in this embodiment, the sub-holding portion 58b of the outer peripheral surface holding member 58 of the first holding member 55 in the fourth embodiment (see FIGS. 13 and 14) is used as the main holding portion. It is changed to a cross-shaped rib-shaped sub-holding portion 58c in 58a. Thus, the main holding portion 58a can be reinforced by providing the rib-type sub holding portion 58c in the main holding portion 58a of the outer peripheral surface holding member 58. The shape of the rib-shaped sub-holding portion 58c may be any shape that reinforces the main holding portion 58a of the outer peripheral surface holding member 58. Various shapes are possible. The rib-type sub-holding portion 58 c can also be applied to the outer peripheral surface holding member 58 in the second holding member 56.

[Example 7]
A seventh embodiment of the present invention will be described. In this embodiment, the holding structure for the adsorbent 34 in the first embodiment is changed. 18 is a side view showing the fuel vapor processing apparatus with a part broken away, FIG. 19 is a cross-sectional view showing a portion XIX in FIG. 18, and FIG. 20 is a cross-sectional view showing a portion XX in FIG. For convenience of explanation, in FIG. 18, the lower holding member is referred to as a first holding member 65, and the upper holding member is referred to as a second holding member 66. Further, in the present embodiment, the pressing member 42 and the pressing spring 43 in the sub case body 16 in the first embodiment (see FIG. 1) are omitted, and the case cylinder portion 27 of the sub case body 16 is vertically It is formed in a two-step cylindrical shape. As a result, the case cylinder 27 includes a first stepped portion 68 corresponding to the end (lower end) on the insertion side of the adsorption body 34 and an end (upper end) on the opposite side to the insertion side of the adsorption body 34. ) And a second stepped portion 69 corresponding to the vicinity.

  The first holding member 65 will be described. As shown in FIG. 19, the first holding member 65 includes an outer peripheral surface holding material 71 that contacts the outer peripheral surface of the adsorbing body 34 and an end surface holding material 72 that contacts the end surface of the adsorbing body 34. In preparation. The outer peripheral surface holding member 71 is formed of a non-breathable rubber-like elastic material. FIG. 21 is a plan view showing the outer peripheral surface holding member of the first holding member, and FIG. 22 is a side sectional view of the same.

  The end surface holding material 72 is formed of a rubber-like elastic material having air permeability, for example, urethane foam, and has an elasticity lower than that of the outer peripheral surface holding material 71. Further, the end surface holding member 72 is formed in a disc shape and is fitted in the case cylinder portion 27 (specifically, the cylindrical portion on the lower side (small diameter side) of the first stepped portion 68). . The end face holding material 72 is close to or superposed on the filter 40. Further, the end surface of the adsorbent 34 is in surface contact with the end surface holding member 72.

  As shown in FIG.21 and FIG.22, the said outer peripheral surface holding material 71 is formed in the annular | circular shape. The outer peripheral surface holding member 71 has a cylindrical mounting base 74 and a tapered cylindrical lip seal portion 75 formed on the inner peripheral surface of the mounting base 74. As shown in FIG. 19, the mounting base 74 is elastically fitted into the case cylinder 27 (specifically, the upper (larger diameter) cylindrical portion of the first stepped portion 68). , Abutted on the stepped portion 68. An annular gap is formed between the attachment base 74 and the outer peripheral surface of the adsorbent 34. The lip seal portion 75 is formed in a lip shape that gradually decreases its inner diameter toward the lower side, and elastically contacts the outer peripheral surface of the insertion side end portion of the adsorbent 34.

  Next, the second holding member 66 will be described. As shown in FIG. 20, the second holding member 66 includes an outer peripheral surface holding material 77 that contacts the outer peripheral surface of the adsorbent body 34 and an end surface holding material 78 that contacts the end surface of the adsorbent body 34. In preparation. The outer peripheral surface holding member 77 is formed of a non-breathable rubber-like elastic material. FIG. 23 is a plan view showing the outer peripheral surface holding member of the second holding member, and FIG. 24 is a side sectional view of the same.

  The end surface holding material 78 is formed of a rubber-like elastic material having air permeability, for example, urethane foam, and has an elasticity lower than that of the outer peripheral surface holding material 77. The end surface holding member 78 is formed in a disc shape and is fitted in the case tube portion 27 (specifically, the upper (large diameter side) tube portion of the second stepped portion 69). . The end surface holding member 72 is in surface contact with the end surface of the adsorbent 34. Further, the outer peripheral portion of the cover plate portion 28 is in surface contact with the outer peripheral portion of the end surface holding member 72.

  As shown in FIGS. 23 and 24, the outer peripheral surface holding member 77 is formed in an annular shape. The outer peripheral surface holding member 77 includes an annular plate-shaped attachment base 80, a cylindrical portion 81 projecting downward in an L-shaped cross section from the inner peripheral portion of the attachment base 80, and a distal end portion of the cylindrical portion 81. It also has a pair of inner and outer tapered cylindrical lip seal portions 82 and 83 branched in a shape. As shown in FIG. 20, the mounting base 80 is elastically fitted into the case cylinder 27 (specifically, the upper (larger diameter) cylindrical portion of the second stepped portion 69). , Abutted on the stepped portion 69. In addition, an annular gap is formed between the inner peripheral surface of the cylindrical portion 81 and the outer peripheral surface of the adsorbing body 34, and the outer peripheral surface of the cylindrical portion 81 and the case cylindrical portion 27 (specifically, the second step) An annular gap is formed between the inner peripheral surface of the upper portion (large-diameter cylindrical portion) of the attaching portion 69. Further, the inner lip seal portion 82 is formed in a lip shape that gradually decreases its inner diameter downward, and elastically contacts the outer peripheral surface of the end portion on the opposite side to the insertion side of the adsorbent 34. Yes. The outer lip seal portion 83 is formed in a lip shape that gradually increases the outer diameter downward, and the case tube portion 27 (specifically, the upper side (large diameter side) of the second stepped portion 69). The cylindrical part) is in elastic contact with the inner peripheral surface.

  According to the evaporative fuel processing apparatus 10 described above, the outer peripheral surface holding members 71 and 77 (specifically, the lip seal portions 75 and 82) included in both the holding members 65 and 66 are in contact with the outer peripheral surface of the adsorbent 34, and the both When the end surface holding members 72 and 78 included in the holding members 65 and 66 come into contact with the end surface of the adsorbent body 34, the adsorbent body 34 can be elastically held in the case 12 (specifically, the sub case body 16). . By the way, the outer peripheral surface holding members 71 and 77 and the end surface holding members 72 and 78 are provided independently, and the end surface holding members 72 and 78 have lower elasticity than that of the outer peripheral surface holding members 71 and 77. The external force applied to the shoulder 34a of the adsorbent 34 can be reduced. As a result, damage to the shoulder portion 34a of the adsorbent 34 by both the holding members 65 and 66 can be prevented or reduced.

  Further, the end surface holding members 72 and 78 are members that cover the entire end surface of the adsorbent 34 and have air permeability. Therefore, the end face holding members 72 and 78 can ensure the air permeability to the adsorbent 34 while protecting the end face of the adsorbent 34 as a whole. Further, since the end surface holding members 72 and 78 generally face the end surface of the adsorbing body 34, a decrease in the adsorbing performance of the adsorbing body 34 due to the non-breathable member facing the end surface of the adsorbing body 34 is avoided. can do.

[Example 8]
Embodiment 8 of the present invention will be described. This embodiment is a modification of the second embodiment. FIG. 25 is a side view showing the fuel vapor processing apparatus with a part broken away.
As shown in FIG. 25, the evaporative fuel processing apparatus 110 of the present embodiment uses the first holding member 37 in the second embodiment (see FIG. 7) as the first holding member in the seventh embodiment (see FIG. 18). The second holding member 38 in the second embodiment (see FIG. 7) is changed to the second holding member 66 in the seventh embodiment. Further, the main case body 14 is formed with a stepped cylindrical case tube portion 27 having two upper and lower steps in the seventh embodiment (see FIG. 18).

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the technical elements described in this specification or the drawings exhibit technical usefulness alone or in combination, and are not limited to those described in the claims. In addition, the technology exemplified in the present specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects. Moreover, in the said Example, although this invention was applied to the 1st holding member and the 2nd holding member, what is necessary is just to apply this invention to at least one holding member. Also, the first holding member and the second holding member in different embodiments can be combined.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a partially broken fuel fuel processing apparatus according to a first embodiment. It is a perspective view which shows an adsorbent. It is sectional drawing which shows the III section of FIG. It is sectional drawing which shows the IV section of FIG. It is an end view which shows the adsorption body equipped with the 1st holding member. It is a sectional side view which shows the principal part of the adsorption body with which the 1st holding member was mounted | worn. It is a side view which shows the fuel vapor processing apparatus which concerns on Example 2 partially broken. It is an end view which shows the adsorption body equipped with the 1st holding member concerning Example 3. It is a sectional side view which shows the principal part of the adsorption body with which the 1st holding member was mounted | worn. It is a side view which shows the fuel vapor processing apparatus which concerns on Example 4 partially broken. It is sectional drawing which shows the XI part of FIG. It is sectional drawing which shows the XII part of FIG. It is an end view which shows the adsorption body equipped with the 1st holding member. It is a sectional side view which shows the principal part of the adsorption body with which the 1st holding member was mounted | worn. It is a side view which shows the fuel vapor processing apparatus which concerns on Example 5 partially fractured | ruptured. It is an end view which shows the adsorption body equipped with the 1st holding member which concerns on Example 6. FIG. It is a sectional side view which shows the principal part of the adsorption body with which the 1st holding member was mounted | worn. FIG. 10 is a side view showing a partially broken fuel fuel processing apparatus according to Embodiment 7. It is sectional drawing which shows the XIX part of FIG. It is sectional drawing which shows the XX part of FIG. It is a top view which shows the outer peripheral surface holding material of a 1st holding member. It is a sectional side view which shows the outer peripheral surface holding material of a 1st holding member. It is a top view which shows the outer peripheral surface holding material of a 2nd holding member. It is a sectional side view which shows the outer peripheral surface holding material of a 2nd holding member. It is a side view which shows the evaporative fuel processing apparatus based on Example 8 partially broken. It is sectional drawing which shows the evaporative fuel processing apparatus which concerns on a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Evaporative fuel processing apparatus 12 Case 14 Main case body 16 Sub case body 34 Adsorbent body 34a Shoulder part 37 First holding member 38 Second holding member 45 Outer peripheral surface holding part 47 End surface holding part 49 Relief recessed part 55 First holding Member 56 second holding member 58 outer peripheral surface holding material 60 end surface holding material 65 first holding member 66 second holding member 71 outer peripheral surface holding material 72 end surface holding material 77 outer peripheral surface holding material 78 end surface holding material 110 evaporative fuel treatment apparatus

Claims (4)

An adsorbent having a honeycomb structure capable of adsorbing and desorbing vapor contained in the evaporated fuel gas;
An evaporative fuel processing apparatus comprising: a case that houses the adsorbent body; and a holding member that elastically holds the adsorbent body in the case,
The holding member includes an outer peripheral surface holding portion that contacts the outer peripheral surface of the adsorbent and an end surface holding portion that contacts the end surface of the adsorbent,
The evaporative fuel processing apparatus, wherein the holding member is provided with an escape recess corresponding to a shoulder formed by the outer peripheral surface and the end surface of the adsorbent. An adsorbent having a honeycomb structure capable of adsorbing and desorbing vapor contained in the evaporated fuel gas;
An evaporative fuel processing apparatus comprising: a case that houses the adsorbent body; and a holding member that elastically holds the adsorbent body in the case,
The holding member has an outer peripheral surface holding material that contacts the outer peripheral surface of the adsorbent, and an elasticity that is held in contact with the end surface of the adsorbent by the outer peripheral surface holding material and is lower than the elasticity of the outer peripheral surface holding material An evaporative fuel processing apparatus, comprising: an end face holding member having An adsorbent having a honeycomb structure capable of adsorbing and desorbing vapor contained in the evaporated fuel gas;
An evaporative fuel processing apparatus comprising: a case that houses the adsorbent body; and a holding member that elastically holds the adsorbent body in the case,
An outer peripheral surface holding material that contacts the outer peripheral surface of the adsorbent and an end surface holding material that contacts the end surface of the adsorbent and has elasticity lower than that of the outer peripheral surface holding material are independent of each other. An evaporative fuel processing apparatus characterized by comprising: It is an evaporative fuel processing apparatus of Claim 2 or 3,
The evaporated fuel processing apparatus, wherein the end surface holding member is a member that covers the entire end surface of the adsorbent and has air permeability.

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