JP3337935B2 - Canister - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canister for capturing fuel vapor generated from a fuel system of an internal combustion engine and preventing the fuel from being released into the atmosphere.

[0002]

2. Description of the Related Art In the above canister, generally,
An adsorbent for capturing the evaporated fuel is filled in the case, and upper and lower surfaces of the adsorbent layer are sandwiched by filters.

As a mounting structure of such a filter, a filter having a structure shown in FIG.
No. 64) and those having the structure shown in FIG. 10 (for example, Japanese Utility Model Laid-Open No. 4-116655).

FIG. 6 shows a case 100 in which a step 101 is formed on the inner peripheral surface at the back of a case 100, and a peripheral portion 103 of one filter 102 is mounted on the step 101, and the one filter After the adsorbent 104 is filled on the adsorbent 104, the other filter 105 and the perforated plate 10 are placed on the adsorbent 104 layer.
6, and the perforated plate 106 is pressed by a spring 108 interposed between the cover 107 and the cover 107 so that both filters 1
02 and 105 are installed with the adsorbent 104 sandwiched therebetween.

FIG. 10 shows a case 200.
Step 201 is formed on the inner peripheral surface of the inner part of
01, a partition wall 202 made of a perforated plate is brought into contact, and a lattice plate 203 similar to a filter is superimposed on the inner surface thereof.
The grid plate 203 is pressed and held by a pressing plate 205 fixed to the outer periphery of a center partition portion 204 formed at the axis of the shaft. The other partition wall 206 and the grid plate 207 are held by a closing member 208.

[0006]

Meanwhile, in the operation of filling the adsorbent in the above-mentioned canister, the adsorbent is filled while the case is vibrated in order to enhance the filling property of the adsorbent.

In the conventional structure shown in FIG. 6, such an operation of filling the adsorbent is performed as shown in FIG. 7 before the filter 105, the perforated plate 106, the cover 107 and the spring 108 are assembled. One of the filters 102 is mounted on the step (seal surface) 101 in the case 100, and the adsorbent 10 is vibrated while the case 100 is vibrated in this state.
4 is gradually introduced into the case 100. for that reason,
Before filling the adsorbent, or as shown in FIG.
When the case 100 is vibrated in a state where a small amount of
8, the peripheral portion 103 of the filter 102 is turned up as shown in FIG. 8, and a gap D is generated between the filter 101 and the step portion 101. 9 through the gap D.
May leak into the space layer 109 as shown in FIG.

[0008] If the adsorbent 104 continues to bite in the gap D, a part of the adsorbent 104 in the adsorbent layer leaks from the gap D into the space layer 109 after mounting on the vehicle. However, there is a problem that the adsorption efficiency is reduced. When the adsorbent leaks into the space layer 109 as shown in FIG. 9 during and after assembly, the adsorbent enters a valve or the like provided on the side of the atmospheric port 110 communicating with the space layer 109, There is a problem that the sealing failure of the valve is caused.

[0009] The adsorbent filling operation of the conventional structure shown in FIG. 10 is performed by removing the partition 206, the grid plate 207 and the closing member 208 shown in FIG.
00 is turned upside down in FIG.
2 is placed on the step portion 201 (seal surface), the lattice plate 203 is placed thereon, and then the pressing plate 205 is fitted and fixed on the outer periphery of the center partition portion 204, and then the case 200 is vibrated. The adsorbent 209 is gradually charged while the adsorbent 209 is being charged.

[0010] For this reason, the work of filling the holding plate 205 is required in the work of filling the adsorbent, and the partition wall 202 and the grid plate 203 are located near the center of the holding plate 20.
5 is pressed by the case 200
It is easy to bend and turn up at the time of vibration, and a problem similar to the structure of FIG. 6 may occur.

Further, since a center partition 204 for supporting the holding plate 205 is required, it can be applied only to a canister having a passage 210 communicating with the adsorbent layer at the center of the case as shown in FIG. There are also problems. Further, since the holding plate 205 is required as a separate component from the case 200, the number of components is increased, and there are problems in component management and manufacturing costs.

Accordingly, the present invention prevents the adsorbent from being caught and leaked due to the curving of the peripheral portion caused by the rising of the filter (lattice plate) as described above, and the turning of the filter is performed only by the case and the filter. It is an object of the present invention to provide a canister that solves the above-mentioned problems by preventing the use of the canister.

[0013]

According to a first aspect of the present invention, a space layer is provided on the bottom side of a bottomed case having one open side, and the space layer is provided on the bottom side. A step is provided between the peripheral wall to be formed and the case body wall filled with the adsorbent, and a filter (16) is provided with a locking hole (17) in the filter on which the peripheral edge of the filter is placed; A locking portion (7) that fits into the locking hole (17) of the filter (16) and locks the filter (16) on the bottom wall (9) that forms the space layer (4) on the case (2) side. 11)
Is formed.

In the present invention, when the case (2) is filled with the adsorbent (18), the filter (16) is locked in advance by locking the locking hole (17) of the filter (16) with the locking portion (11). By fixing the (16) to the case (2), even if the case (2) is filled with the adsorbent (18) while vibrating, the filter (16) does not flutter due to the vibration. Therefore, the peripheral portion (16a) of the filter (16)
Can be prevented from turning up from the step (8), and the adsorbent (18)
Can be prevented from being bitten or the adsorbent (18) leaking into the space layer (4) from the gap.

According to a second aspect of the present invention, in the first aspect, the locking portion (11) is a column-shaped pedestal (12) integrally erected on the bottom wall (9); 12) and a locking projection (13) integrally formed at the tip of the base (1).
The upper surface (12a) of (2) is formed on the same plane as the step (8), and the locking projection (13) has a neck (13a) smaller in diameter than the pedestal (12) and larger than the neck (13a). With the head (13b) having the same diameter as the locking hole (1) of the filter (16).
The diameter of 7) is fitted to the neck portion (13a) and is smaller than the diameter of the head portion (13b).

In the second invention, the filter (1
The filter (16) is pressed by aligning the locking holes (17) of (6) with the locking projections (13), thereby making the locking projections (1).
3) is inserted into the locking hole (17), the neck (13a) is located in the locking hole (17), and the head (13b) is locked on the surface of the filter (16). The filter (16) is provided on the upper surface (12) of the pedestal (12) forming the locking portion (11).
Supported in a).

Therefore, fixing of the filter (16)
This can be easily performed simply by pressing the filter (16), and the support of the filter (16) is improved. Claim 3
According to a third aspect of the present invention, in the second aspect, the locking portion (11) on the case side and the locking hole (1) on the filter (16) side.
7) are eccentrically formed from the center of the case (2).

In the third aspect of the present invention, the filter (1
6) approaches the step (8) side, and the filter (1)
The turning up of the peripheral portion (16a) during the vibration of (6) is further prevented.

According to a fourth aspect of the present invention, a space layer is provided on the bottom side of a bottomed case having one side opened, and a space between a peripheral wall forming the space layer and a case body wall filled with an adsorbent is provided. In a device in which a step is provided and a peripheral portion of the filter is placed on the step, the step (8) is provided on the filter (30).
And a crimp surface (30b) to be crimped and fixed to the inner surface of the peripheral wall (5) forming the space layer (4).
c) is formed.

In the fourth aspect of the present invention, the crimping surface (30) of the filter (30) is attached to the peripheral wall (5) forming the space layer (4).
By press-fitting c), the filter (30) is crimped and fixed, so that the filter (30) is prevented from rising when vibrating. In addition, this crimping fixation is simply performed by using a filter (3).
This can be done only by pressing 0).

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the embodiments shown in FIGS. 1 to 3 show a first embodiment.

FIG. 1 is a side sectional view of an assembled canister. A case 2 constituting the canister 1 is formed of a bottomed cylindrical body having an open end, and is formed of a resin material.

FIG. 2 shows a side sectional shape of the case 2 alone. In FIG. 2, a space layer 4 having a smaller diameter than the adsorbent filling chamber 3 is formed on the bottomed side of the case 2.
And a case body wall 6 forming the adsorbent filling chamber 3 are integrally connected by a horizontal connecting wall 7, and the upper surface of the connecting wall 7 is formed on a horizontal step (seal surface) 8. Have been.

On the bottom wall 9 forming the space layer 4,
A plurality of pin-shaped posts 10 are integrally formed upright, and
The upper end surface of the reference numeral 0 is located on the same horizontal plane as the step 8. Further, a locking portion 11 is integrally formed on the bottom wall 9. The locking portion 11 includes a pedestal 12 and a locking projection 13. The pedestal 12 is formed upright on the bottom wall 9 in a columnar shape, and a locking projection 13 is integrally formed upright at the center of the upper surface. The upper surface 12a of the pedestal 12 at the outer peripheral portion of the locking projection 13 is formed on the same horizontal plane as the step 8 and serves as a filter support surface. Further, the locking projection 13 has a neck 13 having a diameter smaller than the diameter of the pedestal 12.
a and a head 13b formed of a spherical shape having a larger diameter than the neck 13a at the upper end of the neck 13a.

A plurality of pedestals 12 integrally formed with such locking projections 13 are provided at positions eccentric to the side from the center of the case 2, and in the embodiment shown in FIG.
Are provided. Each pedestal 12 is desirably close to the step 8. In the embodiment shown in the figure, the pedestal 12 is provided at an intermediate portion between the center of the case 2 and the step 8.

An atmosphere port 14 communicating with the space layer 4 is formed integrally with the bottom wall 9.
A flange 15 is integrally formed at the upper end of the cover. A filter 16 is provided in the case 2 as shown in FIG. As shown in FIG. 3, the filter 16 is formed in the shape of a disk having the same diameter as the adsorbent filling chamber 3 and has the same number as the number of the locking projections 13 and the position where the neck 13a of the locking projection 13 is formed. Locking hole 1 located at the matching part
7 are formed penetrating in the front and back directions.

The filter 16 is formed of a member having a bending elasticity in the front and back directions. For example, resin fibers having very fine thicknesses, more specifically, rayon fibers, nylon fibers, polyester fibers (trade names) Tetron) and is formed of a known non-woven fabric entangled with these fibers.

Further, the thickness of the filter 16 is about 2.5 m.
m, and the relationship between the thickness and the length of the neck 13a is:
The length of the neck 13a and the thickness of the filter 16 may be substantially the same, but it is desirable that the length of the neck 13a is slightly shorter than the thickness of the filter 16.

The diameter of the locking hole 17 is smaller than the diameter of the head 13b of the locking projection 13 and the diameter of the neck 13
It is formed to have a diameter that fits loosely into a. In FIG. 1, the adsorbent 18 is filled in the adsorbent filling chamber 3 on the filter 16, another filter 19 is placed on the upper surface of the adsorbent layer, and the porous plate 20 is further placed on the upper surface. Have been. Then, the cover 21 is compressed by a spring 22 between the cover 21 and the perforated plate 20 so that the flange 15 of the case 2 is
It is stuck to.

The cover 21 is provided with an evaporative fuel introduction port 23 and a purge port 24. Next, the operation of filling the adsorbent in the above embodiment will be described.

First, with only the case 2 shown in FIG. 2, the filter 16 shown in FIG. 3 is inserted into the adsorbent filling chamber 3, and each locking hole 17 of the filter 16 is fitted to each locking projection 13. At the same time, the filter 16 around the locking hole 17 is pressed, and the locking hole 17 is inserted into the neck 13 a of the locking projection 13.
Fits. At this time, the diameter of the locking hole 17 is increased once at the head 13b, and is reduced to its original shape after being fitted to the neck 13a.
Therefore, the fitted filter 16 has the head 13b
Are locked on the surface of the filter 16 so as not to easily come off. Also, the peripheral portion 1 of the filter 16
6 a is placed on the step 8 in the case 2, and the other portions are supported by the upper surface 12 a of the pedestal 12 and the upper surface of the support 10.

Next, the adsorbent 18 is gradually charged into the adsorbent filling chamber 3 while vibrating the case 2. At the time of this vibration, the filter 16 is fixed so as not to come off the locking projection 13, and the fixing point of the filter 16 by the locking projection 13 is eccentric to the step 8 side from the center of the case 2, and Has elasticity, so that the filter 16 does not move up due to the vibration of the case 2 and the peripheral portion 16a of the filter 16 does not move up.

Therefore, the adsorbent is prevented from biting between the filter 16 and the step portion 8 and leaking into the space layer 4 as in the conventional structure shown in FIG. In particular, by forming the length of the neck portion 13a shorter than the thickness of the filter 16 as described above, the peripheral edge portion 16a of the filter 16 comes into close contact with the step portion 8 in pressure contact, thereby further preventing the peripheral edge portion 16a from being turned up. In addition, biting and leakage of the adsorbent can be further prevented.

After the filling of the adsorbent 18 is completed, the other filter 19 and the perforated plate 20 are inserted, and the cover 21 is fixed to the case 2 via the spring 22. Next, a second embodiment shown in FIGS. 4 and 5 will be described.

In the second embodiment, the filter is fixed directly using the peripheral wall of the case. That is, a step 8 similar to that of the first embodiment is formed in the case 2, and a column 10 that does not reach the step 8 is integrally formed on the bottom wall 9. 4
Thick main part 30a press-fitted to the inner peripheral surface of the peripheral wall 5
And a flange-shaped locking piece 30b protruding so as to be placed on the step 8 on the upper outer periphery of the main body 30a.

The diameter of the crimping surface 30c of the main body 30a which is press-fitted to the inner peripheral surface of the peripheral wall 5 of the space layer 4 is formed to be slightly larger than the diameter of the inner peripheral surface of the peripheral wall 5, and the elasticity of the filter 30 is increased. Thereby, the crimping surface 30 c is crimped to the peripheral wall 5. In addition, the diameter of the locking piece 30b is formed to a diameter that fits almost entirely with the case body wall 6. The filter 30 is made of the same material as in the first embodiment.

The other structure is the same as that of the first embodiment except for the locking portion 11 and the locking hole 17 in the first embodiment. Therefore, the same parts as those described above are denoted by the same reference numerals. The description is omitted.

The filling operation of the adsorbent 18 in the second embodiment is performed by the other filter 19, the plate 20, and the cover 2.
1. In the state of only the case 2 from which the spring 22 is removed, first, the crimping surface 30c of the filter 30 is press-fitted to the inner peripheral surface of the peripheral wall 5 and the locking piece 30b is placed on the step 8 to remove the filter 8. Is fixed in the case 2. Next, the adsorbent 18 is gradually charged into the adsorbent filling chamber 3 while vibrating the case 2.

When the case 2 vibrates, the filter 30 is fixed to the peripheral wall 5 of the space layer 4 by pressure bonding, so that the filter 30 is prevented from rising. for that reason,
As in the conventional structure shown in FIG.
And the step portion 8 and the leakage to the space layer 4 are prevented.

In particular, according to the structure of this embodiment, as shown in FIG.
(Step 8) so that the locking piece 30b
The turning up can be further prevented, and the adsorbent 18 can be more reliably prevented from being caught and leaked. Further, the fixing structure can be a simple structure using the wall surface of the case as it is.

[0041]

As described above, according to the first aspect of the present invention, the rising of the filter is prevented by preventing the rising of the filter, and the rising of the peripheral portion of the filter is prevented. It is possible to prevent the adsorbent from biting or leaking.

Further, since the filter is fixed by the locking portion integrally formed on the bottom wall of the space layer in the case, a canister of a type having a passage at the center of the case as in the conventional structure shown in FIG. However, the present invention is not limited to the above, and does not require a separate component from the case. Therefore, the number of components is not increased, which is effective in component management and manufacturing cost.

According to the second aspect of the present invention, the work of fixing the filter is further facilitated and the filter can be well supported. According to the third aspect of the present invention, it is possible to further prevent the adsorbent from being caught or leaked.

According to the fourth aspect of the present invention, the above effect can be exhibited, and the filter can be fixed by using the peripheral wall of the space layer. Therefore, the fixing structure is simplified, and the fixing position of the filter can be changed. The filter can be approached to the stepped portion, so that the edge of the filter can be prevented from being turned up more reliably. Further, the fixing work of the filter can be easily performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a canister showing a first embodiment of the present invention.

FIG. 2 is a side sectional view showing only a case in the canister of FIG. 1;

FIG. 3A is a plan view of the filter in FIG. 1,
(B) is XX sectional drawing in (a).

FIG. 4 is a side sectional view of a canister showing a second embodiment of the present invention.

FIG. 5 is a bottom view of the filter in FIG.

FIG. 6 is a side sectional view showing a conventional canister.

FIG. 7 is a side sectional view showing a case and a filter before the adsorbent is filled in the canister of FIG. 6;

8 is a side sectional view showing an initial state in which the case is filled with the adsorbent while vibrating the case in the state of FIG. 7, and shows a state in which the adsorbent is bitten.

FIG. 9 is a side sectional view showing a state in which the adsorbent has leaked into the space layer after the adsorbent of FIG. 8 has been filled.

FIG. 10 is a side sectional view showing another example of the conventional canister.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 2 ... Case 4 ... Space layer 5 ... Peripheral wall 8 ... Step part 9 ... Bottom wall 11 ... Locking part 12 ... Pedestal 13 ... Locking projection 13a ... Neck 13b ... Head 16 ... Filter 16a ... Peripheral part 17 of a filter Stop hole 30 ... Filter 30b ... Lock piece 30c ... Crimping surface

Claims (4)

(57) [Claims] 1. A space layer is provided on the bottom side of a bottomed case having one open side, and a step is provided between a peripheral wall forming the space layer and a case body wall filled with an adsorbent. In the case where the peripheral portion of the filter is placed, a lock hole is formed in the filter, and a lock that fits into the lock hole of the filter and locks the filter on the bottom wall that forms the space layer on the case side. A canister characterized by forming a portion. 2. The locking portion comprises a column-shaped pedestal integrally formed on the bottom wall and a locking projection integrally formed at the tip of the pedestal, and the upper surface of the pedestal is formed on the same plane as the step portion. The locking projection is formed by a neck portion having a diameter smaller than the diameter of the pedestal and a head portion having a diameter larger than the neck portion, and the diameter of the locking hole of the filter is fitted to the neck portion and the diameter is smaller than the diameter of the head portion. The canister of claim 1 formed. 3. The canister according to claim 1, wherein the locking portion on the case side and the locking hole on the filter side are formed eccentrically from the center of the case. 4. A space layer is provided on the bottom side of a bottomed case having one open side, and a step is provided between a peripheral wall forming the space layer and a case body wall filled with an adsorbent. A canister wherein a peripheral portion of a filter is placed, wherein the filter has a locking piece to be placed on the step and a crimping surface for crimping and fixing to an inner surface of a peripheral wall forming the space layer. .