JPH08312472A - Canister for vehicle - Google Patents

Abstract

PURPOSE: To prevent an absorption effect from being degraded caused by the occurrence of gaps as absorbing agent is pulmerized by increasing the degree of freedom in mounting with a casing simplified in shape, and concurrently enhancing the property of mass production in the transverse type canister where the flow direction gas in the inside of a casing is roughly horizontal. CONSTITUTION: A movable support plate 121 is so constituted as to be inclined to a side which is parted from a stationary filter 10 as it goes upward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing in which a fixed filter is fixedly arranged on one end side in a tubular casing having both ends closed, and a movable support plate provided with a plurality of communication holes for allowing gas flow. An adsorbent layer, which is slidably fitted to the other end of the movable support plate, is superposed on the inner surface side of the movable support plate and is supported between the movable filter and the fixed filter, is filled with an adsorbent to hold an adsorbent layer. The present invention relates to a vehicle canister in which a spring that urges the movable support plate in the direction of compressing the adsorbent layer is provided between the movable support plate and the casing, and in particular, a horizontal type in which the gas flow direction in the casing is substantially horizontal. Vehicle canister of.

[0002]

2. Description of the Related Art Conventionally, in such a laterally mounted vehicle canister, a fine powder of an adsorbent such as activated carbon due to vibration during vehicle mounting creates a void between the upper portion of the casing and the adsorbent layer, and the gas flows through the void. By doing so, sufficient adsorption efficiency may not be obtained, and a technique for solving such a problem is disclosed in, for example, JP-A-62-28495.
No. 1, gazette 5-17410 gazette and gaikaihei 7
No. 14148, for example.

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent Publication No. 4951, a casing is provided with a protrusion projecting upward from the upper portion thereof, and when the adsorbent is pulverized to form a void between the upper portion of the casing and the adsorbent layer, the void is filled with the adsorbent in the protrusion. In Japanese Utility Model Publication No. 5-17410, the above-mentioned Japanese Laid-Open Patent Publication No. 62-2849 is constructed by inclining the upper part of the casing.
Although the same effect as that of Japanese Patent No. 51 is obtained, the degree of freedom in attaching the casing to the vehicle body is increased due to the structure in which a part of the casing projects or the entire upper part of the casing is inclined. descend. Furthermore, the actual Kaihei 7-14
In Japanese Patent Publication No. 148, a plurality of ribs are provided on the inner surface of the upper part of the casing, and even if a gap is formed between the upper part of the casing and the adsorbent layer, the ribs prevent the gas from flowing, but there are ribs. This complicates the processing of the casing, and the ribs obstruct the filling of the adsorbent into the casing, resulting in poor mass productivity.

The present invention has been made in view of the above circumstances, and simplifies the shape of the casing to increase the degree of freedom in mounting and to improve the mass productivity, and further, the adsorbent is pulverized. An object of the present invention is to provide a vehicle canister that prevents a decrease in adsorption efficiency due to the generation of voids.

[0005]

In order to achieve the above object, the invention according to claim 1 has a fixed filter fixedly arranged at one end side in a cylindrical casing whose both ends are closed to allow gas flow. A movable support plate having a plurality of communication holes provided therein is slidably fitted to the other end side in the casing and overlaps and is supported on the inner surface side of the movable support plate, and between the fixed filter and the fixed filter. Holds an adsorbent layer formed by filling the adsorbent, and a spring for urging the movable support plate in the direction of compressing the adsorbent layer is provided between the movable support plate and the casing. In the horizontal casing, the movable support plate is formed so as to be inclined toward the side away from the fixed filter as it goes upward.

According to a second aspect of the present invention, there is provided a movable support plate in which a fixed filter is fixedly arranged at one end side in a cylindrical casing having both ends closed, and a plurality of communication holes for allowing gas flow are provided. An adsorbent layer filled with an adsorbent is held between the movable filter and the fixed filter, which is slidably fitted to the other end of the casing and overlaps and is supported on the inner surface of the movable support plate. In a vehicle canister in which a spring for urging the movable support plate in the direction of compressing the adsorbent layer is provided between the movable support plate and the casing, the casing has a posture in which the axis of the casing is inclined with respect to the horizontal plane. It is attached to.

[0007]

According to the structure of the invention described in claim 1, since the movable support plate biased by the spring in the direction of compressing the adsorbent layer is inclined, the force in the direction of pushing up the adsorbent layer is exerted. Even when the adsorbent is pulverized due to the action of, the formation of voids between the upper part of the casing and the adsorbent layer is prevented.

Further, according to the configuration of the invention described in claim 2, since the casing has a posture in which its axis is inclined with respect to the horizontal plane, when the adsorbent is pulverized, the upper portion of the casing is And, although voids may be partially formed between the adsorbent layers, voids are not formed over the entire length of the adsorbent layer along the axial direction of the casing.

[0009]

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

First, referring to FIG. 1 showing a first embodiment of the present invention, a casing 5 of this canister has an end wall 6a at one end.
Main body 6 having a bottom and a bottomed cylindrical shape
And a lid member 7 that is connected to the other end of the casing main body 6 and closes the other end of the casing main body 6, and is made of, for example, a synthetic resin. Moreover, a plurality of support pins 8, 8 ... Are provided on the inner surface of the end wall 6a.

At one end of the casing main body 6 in the casing 5, a fixed filter 10 is inserted and arranged, which forms an introduction chamber 9 between itself and the end wall 6a and is supported by a plurality of support pins 8, 8, .... On the other hand, on the other end side of the casing main body 6,
The movable support plate 1 is formed in a disk shape having a large number of communication holes 11, 11 ... Allowing the gas to flow, and is inclined toward the side away from the fixed filter 10 as it goes upward.
2 ₁ have been fitted, the movable support plate 12 ₁ of the cylindrical skirt 1 which is in sliding contact with the inner surface of the casing body 6 at the peripheral
One end of the skirt 3 is integrally connected, and the other end of the skirt 13 is integrally connected with a disc-shaped receiving plate 15 having a through hole 14 at the center. A movable filter 16 is superposed and supported on the inner surface side of the movable support plate 12 ₁ , and the fixed filter 10
And the adsorbent layer 17 formed by filling the adsorbent, for example, activated carbon, is held between the movable filter 16.

[0012] is under compression between the movable support plate 12 ₁ and the integral of the receiving plate 15 and the lid member is between 7 is formed with a discharge chamber 18, exhaust outlet chamber 18 receiving plate 15 is housed in and the lid member 7 The movable support plate 12 ₁ is attached to the adsorbent layer 1 by the spring 19.
It is urged in the direction of compressing 7.

On the end wall 6a of the casing main body 6,
An evaporated fuel conduit 20 for guiding evaporated fuel generated in a fuel tank (not shown) during non-fuel refueling when the vehicle is parked or running, and a purge gas pipe 21 for purging the evaporated fuel adsorbed by the canister into the intake system of the internal combustion engine. Are connected so as to communicate with the introduction chamber 9, and the lid member 7 is connected with an open pipe 22 communicating with the discharge chamber 18.

Next, the operation of the first embodiment will be described. The evaporated fuel introduced from the evaporated fuel conduit 20 into the introducing chamber 9 at the time of non-fuel refueling such as when the vehicle is parked or running is fixed filter 10, Adsorbent layer 17, movable filter 1
6, through the communication holes 11, 11 ... And the through hole 14 of the movable support plate 12 ₁ to flow toward the discharge chamber 18 side,
The evaporated fuel is adsorbed by the adsorbent in the adsorbent layer 17.

Further, at the time of gas purging, the air introduced from the open pipe 22 into the discharge chamber 18 flows through the adsorbent layer 17 toward the introduction chamber 9 side, so that the purge gas is accompanied by the air. It is led from the pipe 21 to the intake system of the internal combustion engine.

In such a canister, when the adsorbent such as activated carbon is pulverized due to vehicle vibration or the like, a gap is likely to be formed between the upper portion of the casing 5 and the adsorbent layer 17. However, the movable support plate 12 ₁ , which is supported by the respective support pins 8 and 8 and is spring-biased in the direction of pressing the adsorbent layer 17 toward the fixed filter 10 side that is substantially at the fixed position, moves upward. As it is inclined toward the side away from the fixed filter 10 as it goes toward, the force in the upward direction acts on the adsorbent layer 17. Therefore, even if the adsorbent is pulverized, it is prevented that the movable support plate 12 ₁ is moved in the direction closer to the fixed filter 10 by that amount, and a gap is generated between the upper portion of the casing 5 and the adsorbent layer 17. Evaporated fuel does not flow around the adsorbent layer 17 to the discharge chamber 18 side, and sufficient adsorption efficiency can be obtained.

Moreover, the outer surface shape and the inner surface shape of the casing 5 are not complicated in order to prevent the formation of the voids, and a rib or the like is provided on the inner surface of the casing 5 so as to obstruct the filling of the adsorbent. Because there is no
It is possible to increase the degree of freedom in mounting the canister and improve mass productivity.

Further, since the skirt 13 provided integrally with the movable support plate 12 ₁ slides inside the casing 5, even if the movable support plate 12 ₁ is distorted, the adsorbent will flow out to the discharge chamber 18 side. There is no.

In the first embodiment described above, the canister that adsorbs the evaporated fuel generated in the fuel tank when the vehicle is running and parked has been described. However, the canister that also adsorbs the evaporated fuel generated during refueling is described. In this case, the evaporative fuel during traveling and parking and the evaporative fuel during refueling may be guided by a common vaporized fuel conduit or by separate vaporized fuel conduits. May be.

2 and 3 show a second embodiment of the present invention, in which parts corresponding to those of the first embodiment are designated by the same reference numerals.

The casing 5'is composed of a casing main body 6'which has an end wall 6a 'at one end and is formed in a rectangular tube shape, and a lid member 7'which is joined to the other end of the casing main body 6'. On the inner surface of the casing main body 6 ', both side ends of the partition wall 24 extending to the lid member 7'side with one end connected to the end wall 6a' at a right angle are integrally connected. The first fixed filter 10 _{1, which} is formed on one side of the partition wall 24 inside the casing main body 6 ′, forms the introduction chamber 25 between itself and the end wall 6 a ′ and is supported by a plurality of support pins 8, 8 ... In the casing main body 6'on the other side of the partition wall 24, the second fixed filter 10 ₂ is formed, which is formed between the discharge chamber 27 and the end wall 6a 'and is supported by the plurality of support pins 8, 8 ... Inserted and placed.

On the other hand, on the other end side of the casing main body 6 ',
Has a large number of communication holes 11, 11 ... Allowing gas flow
And corresponding to the inner surface shape of the casing main body 6 '.
Movable support plate 12 formed in a rectangular flat plate shape₁´ is above
Both fixed filters 10 toward₁, 10₂Away from
The movable support plate 12 is fitted so as to be inclined on the opposite side.
₁At the periphery of ′, there is a corner that slidably contacts the inner surface of the casing main body 6 ′.
One end of a cylindrical skirt 13 'is integrally connected to form the skirt.
A square having a through hole 14 at the center at the other end of the port 13 '.
Flat plate-shaped receiving plates 15 'are integrally connected. Movable support
Holding plate 12₁The movable filter 16 ′ is superposed on the inner surface side of ‘
Supported, the first fixed filter 10 ₁And movable
The adsorbent layer 17 by filling the adsorbent between the filters 16 '₁But
Holds the second fixed filter 10₂And movable filter
The adsorbent layer 17 is formed by filling the space between 16 'with the adsorbent.₂Is held
Be done. Moreover, the end of the partition wall 24 facing the movable filter 16 '
Is the movable support plate 12₁Formed to incline corresponding to
Is done.

A receiving plate 15 'integrated with the movable support plate 12 ₁ '
And an intermediate chamber 26 is formed between the lid member 7 ',
A spring 19 for urging the movable support plate 12 ₁ ′ in the direction of compressing the adsorbent layer 17 is housed in the intermediate chamber 26.

The end wall 6a of the casing main body 6 '
An evaporative fuel conduit 20 and a purge gas pipe 21 are connected to ′ ′ so as to communicate with the introduction chamber 25, and an open pipe 22 that communicates with the discharge chamber 27 is connected thereto.

According to this second embodiment, the fuel vapor conduit 2
The evaporated fuel introduced into the introduction chamber 25 from 0 passes through the first fixed filter 10 ₁ and passes through the adsorbent layer 17 ₁ into the intermediate chamber 2
Distributed to the 6 side. Movable filter 16 'and the movable support plate 12 ₁ Thus' vaporized fuel enters the intermediate chamber 26 through the the movable support plate 12 _'and the movable filter 16' again pass to the adsorbent layer 17 in the ₂ Enter the adsorbent layer 17
Within ₂ will be distributed toward the discharge chamber 27 side. Therefore, the vaporized fuel is adsorbed by the adsorbent in both adsorbent layers 17 ₁ and 17 ₂ .

At the time of gas purging, the air introduced from the open pipe 22 into the discharge chamber 27 flows from the adsorbent layer 17 ₂ through the intermediate chamber 26 through the adsorbent layer 17 ₁ toward the introduction chamber 25 side. The purge gas is introduced from the purge gas pipe 21 into the intake system of the internal combustion engine while being entrained in the air.

Also in such a canister, the movable support plate 12 ₁ ′ moves upward as the fixed filter 1 moves upward.
By inclining to the side away from 0 ₁ and 10 ₂ , the same effect as the first embodiment can be obtained.

FIG. 4 shows a third embodiment of the present invention, and the portions corresponding to the respective embodiments described above are designated by the same reference numerals.

In a casing 5 composed of a casing main body 6 having a bottomed cylindrical shape having an end wall 6a at one end, and a lid member 7 connected to the other end of the casing main body 6, At one end side, a fixed filter 10 is formed which is formed between the end wall 6a and a discharge chamber 18 and is supported by a plurality of support pins 8, 8 ... On the other hand, the casing main body 6
On the other end side of the, a large number of communication holes 1 that allow the flow of gas
A movable support plate 12 having a disk-like shape having 1, 11, ...
₂ is fitted to the movable support plate 12 ₂ , and
In order to allow the movable support plate 12 ₂ slides while maintaining a posture substantially perpendicular to the axis of the casing body 6, contiguously one end of a short cylindrical skirt 30 in sliding contact with the inner surface of the casing body 6 is integrally To be done. Movable filter 16 on the inner surface of the movable support plate 12 ₂ is polymerized, and is supported, the adsorbent layer 17 by filling the adsorbent is held between the fixed filter 10 and the movable filter 16.

[0030] A supply chamber 9 is formed between the movable support plate 12 ₂ and the lid member 7, the conductor entry 9, the adsorbent layer 17
Spring 19 for urging the movable support plate 12 ₂ in the direction of compressing
Is stored.

An open pipe 22 communicating with the discharge chamber 18 is connected to the end wall 6a of the casing main body 6, and an evaporated fuel conduit 20 and a purge gas pipe 21 are connected to the lid member 7 so as to communicate with the introducing chamber 9. It

The casing 5 of such a canister is
The stay 5 is attached to the vehicle body 28 by the stay 29. In the attached state, the casing 5 is in a posture in which the axis of the casing 5 is tilted by an angle α with respect to the horizontal plane, and the open pipe 22 is diagonally upward and the casing is inclined. Connected to 5.

According to the third embodiment, since the casing 5 has a posture in which its axis is inclined with respect to the horizontal plane, when the adsorbent is pulverized, the upper portion of the casing 5 and the adsorbent are Although an air gap may partially occur between the layers 17, the adsorbent layer 17 along the axial direction of the casing 5
No void is formed over the entire length of the. Therefore, the evaporated fuel does not flow around the adsorbent layer 17 to the discharge chamber 18 side, and sufficient adsorption efficiency can be obtained.

Moreover, since the structure of the canister does not change at all by merely inclining the mounting posture of the casing 5 to the vehicle body 28, the canister having the conventional structure can be used. In addition, the adsorbent layer 17 is pressed obliquely upward by the spring force of the spring 19, so that the spring force of the spring 19 acts more effectively than that of a simple horizontal type, and the adsorbent layer 17 is more effective. The gap can be made as small as possible to increase the packing density.

Further, since the open pipe 22 is located at the upper position, the flow direction of the evaporated fuel is obliquely upward, and the adsorption performance can be improved by the gravity effect, and at the same time, water and dust are prevented from entering through the open pipe 22. It can be prevented as much as possible.

Incidentally, in the above-mentioned embodiments, the explanation has been made mainly for the purpose of preventing the decrease of the adsorption efficiency due to the generation of the voids due to the pulverization of the adsorbent, but the pelletization or the large particle size of the adsorbent such as activated carbon or the like. The present invention is more effective in such a canister, since voids are more likely to occur when the canister is designed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the present invention described in the claims. It is possible.

[0038]

As described above, according to the first aspect of the present invention, the movable support plate is formed so as to be inclined toward the side away from the fixed filter as it goes upward in the casing whose axis is substantially horizontal. Therefore, by exerting a force in the direction of pushing up on the adsorbent layer, even if pulverization of the adsorbent occurs, it is possible to prevent the formation of voids between the upper part of the casing and the adsorbent layer and prevent a decrease in adsorption efficiency. Can
Moreover, since the casing has a simple shape, the degree of freedom in mounting can be increased and the mass productivity can be improved.

According to the second aspect of the invention, since the casing is attached to the vehicle body in a posture in which the axis of the casing is inclined with respect to the horizontal plane, when the adsorbent is pulverized, the upper portion of the casing and Even if a gap is partially formed between the adsorbent layers, a gap is not formed over the entire length of the adsorbent layer along the axial direction of the casing,
It is possible to reliably prevent the evaporative fuel from flowing around the adsorbent layer and prevent a decrease in adsorption efficiency. In addition, since the casing has a simple shape, mounting flexibility is increased and mass production is performed. It is possible to improve the property.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a canister of a first embodiment.

FIG. 2 is a cross-sectional view of a canister of a second embodiment.

FIG. 3 is a sectional view taken along line 3-3 of FIG. 2;

FIG. 4 is a vertical cross-sectional view showing how a canister of a third embodiment is attached to a vehicle body.

[Explanation of symbols]

5, 5 '... Casing 10, 10 ₁ , 10 ₂ ... Fixed filter 11 ... Communication hole 12 ₁ , 12 ₁ ', 12 ₂ ... Movable support plate 16, 16 '... Movable filter 17, 17 ₁ , 17 ₂ ... Adsorbent layer 19 ... Spring 28 ... Vehicle body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeaki Nakajima 1-4-1, Chuo, Wako-shi, Saitama Inside Honda R & D Co., Ltd. (72) Inventor Takeshi Hara 1-4-1, Chuo, Wako-shi, Saitama Incorporated in Honda R & D Co., Ltd. (72) Inventor Shoichi Gazono 1-4-1, Chuo, Wako, Saitama Incorporated in R & D Co., Ltd.

Claims (2)

[Claims] 1. A tubular casing (5, 5) having both ends closed.
′) Fixed filter (10; 10 ₁ , 1) on one end side
_No. 0 ₂ ) is fixedly arranged, and a plurality of communication holes (11) for allowing the flow of gas are provided in the movable support plates (12 ₁ , 12 _1).
′) Is slidably fitted to the other end side in the casing (5, 5 ′) and is superposed and supported on the inner surface side of the movable support plate (12 ₁ , 12 ₁ ′). 16 ') and the fixed filter (10; 10 ₁ , 10 ₂ ) hold an adsorbent layer (17; 17 ₁ , 17 ₂ ) formed by filling the adsorbent with the movable support plate (12 ₁ , 12). ₁ ′) and the casing (5, 5 ′) between the adsorbent layer (17; 17 ₁ ,
17 ₂ ) is movable in the direction of compressing the support plates (12 ₁ , 12 ₁
In a vehicle canister provided with a spring (19) for urging a spring (19 '), a casing (5, 5) with an axis substantially horizontal
′), The movable support plates (12 ₁ , 12 ₁ ′) are fixed filters (10; 10 ₁ , 10 ₂ ) as they move upward.
A canister for a vehicle, which is formed so as to be inclined toward a side away from the canister. 2. A movable support in which a fixed filter (10) is fixedly arranged at one end side in a tubular casing (5) having both ends closed, and a plurality of communication holes (11) for allowing gas flow are provided. A movable filter (16) in which the plate (12 ₂ ) is slidably fitted to the other end side in the casing (5) and is superposed and supported on the inner surface side of the movable support plate (12 ₂ ) and the fixed filter. An adsorbent layer (17) is filled with the adsorbent between the movable support plate (12 ₂ ) and the casing (5) in a direction in which the adsorbent layer (17) is compressed. In a vehicle canister provided with a spring (19) for biasing a movable support plate (12 ₂ ), a casing (5)
Is attached to a vehicle body (28) in a posture in which its axis is inclined with respect to a horizontal plane.