JP2000186635A - Canister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent burrs generated from a fusion part from flowing to an engine through a purge port, and prevent it from invading into an inside of a check valve by arranging a wall in the vicinity of the fusion part so as to isolate the purge port and the fusion part for fusing a filter and a casing with protrusions for fusion. SOLUTION: Protrusions 2A, 2B for fusion are formed along a full circumference in the vicinity of a circumference of adsorbent chambers 7A, 7B for adsorbing evaporation fuel, on circumferential flat parts 3A, 3B formed on a casing 1 of a canister, and walls 8A, 8B are formed in the vicinity of insides of the protrusions 2A, 2B. Spaces (recessed parts) 9A, 9B are defined between the protrusions 2A, 2B and lower surfaces of the walls 8A, 8B and filters 4A, 4B. The filters 4A, 4B are mounted on flat parts 3A, 3B, and burr generated in the case where the protrusions 2A, 2B and the filters 4A, 4B and fused with ultrasonic wave are housed in spaces 9A, 9B so as to prevent fused burr from invading into check valves 6A, 6B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canister for adsorbing evaporated fuel of an engine of an automobile or the like.

[0002]

2. Description of the Related Art A simple manufacturing method for obtaining a filter with reliable operation has been proposed in Japanese Patent Application Laid-Open No. 8-229312.

In this conventional technique, a lower case, which is one of an upper and lower case made of nylon, is provided with a flat peripheral portion having a protrusion, a filter element made of polyester fiber is placed on the protrusion, and the protrusion is melted by ultrasonic waves. To penetrate into the fiber gap of the filter element and fix it securely.
A filter is manufactured by a simple manufacturing method.

[0004]

When the above prior art is applied to a filter of a canister for adsorbing evaporated fuel of an engine, as shown in FIG. 7, a canister casing 1 has a peripheral flat portion 3 having a projection 2 having a projection 2. The filter element 4 (hereinafter, simply referred to as a filter) mounted on the flat portion 3 is welded by the projection 2 (FIG. 8).

However, as shown by reference numeral 5 in FIG. 8, the burrs 5 generated during welding fall off and bite into the check valve 6, resulting in abnormal operation of the check valve. May flow out to the intake system.

Further, as shown in FIG. 9, a cap 20 may be placed on the casing 1 of the canister, and the cap 20 may be subjected to vibration in the left-right direction in the figure to perform vibration welding on the casing 1. However, since the shape of the vibration welding portion is a flat type, burrs 5A are generated at the time of welding as shown in FIG. 10 and fall into the inside of the casing 1 to bite into a check valve (not shown). There is a possibility that a problem may occur that the gas flows out from the purge port to the intake system of the engine through the purge port.

Accordingly, an object of the present invention is to provide a canister that can solve such abnormalities and problems.

[0008]

According to one aspect of the present invention, there is provided a casing, an adsorbent chamber provided inside the casing and containing an adsorbent for adsorbing fuel vapor, and an engine. A canister having a purge port connected to the intake port of the fuel tank, a tank port connected to the fuel tank, and an atmosphere port opened to the atmosphere, and having a filter between the ports and the adsorbent chamber. A wall is provided in the vicinity of the welded portion so as to isolate a welded portion for welding the filter and the casing with a welding projection from the purge port.

In the present invention, since the wall provided near the welded portion separates the welded portion of the casing from the purge port, burrs generated from the welded portion flow out to the engine through the purge port, or the inside of the check valve. To prevent intrusion into

[0010] The invention of claim 2 provides a casing, an adsorbent chamber provided inside the casing and containing an adsorbent for adsorbing evaporated fuel, a purge port connected to an intake port of the engine, and a fuel tank. In a canister having a tank port to be connected and an atmosphere port opened to the atmosphere and having a cap welded to the casing, welding burrs generated at a welded portion of the casing and the cap are positively formed on the outside of the casing. A canister characterized in that the shape of the welded portion is asymmetrical so as to occur.

According to the present invention, in order to prevent the asymmetrical welded portion from forming welding burrs on the inside of the casing, the welding burrs may enter the check valve and bite into the casing, or the welding burrs may enter the purge port through the check valve. Outflow to the engine is prevented.

According to a third aspect of the present invention, in the canister of the second aspect, the welding portion is isolated from the purge port.
It is characterized in that a wall is provided near the welded portion.
According to the present invention, the wall provided near the welded portion reliably prevents the welding burrs from falling into the inside of the casing, thereby more reliably preventing the check valve from being defective due to the welding burrs and the leakage of the welding burrs to the engine. I do.

According to a fourth aspect of the invention, in the canister of the first aspect, a room having a volume equal to or larger than the volume of the welding projection is formed between the welding portion, a wall near the welding portion, and the lower surface of the filter. Is characterized by the following.

According to the present invention, the burr generated from the welded portion overflows from the room formed between the welded portion, the wall near the welded portion, and the lower surface of the filter, and the burr flows out to the engine or the inside of the check valve. It can be reliably prevented from entering and chewing.

According to a fifth aspect of the invention, in the canister of the fourth aspect, the welding projection has a taper on a side opposite to a wall near the welding portion. According to the present invention, the burr generated from the welding portion can be reliably accommodated in the room by the taper formed in the welding protrusion.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, preferred embodiments of the present invention will be described with reference to the drawings. [Embodiment 1] In Figs. 1 to 3, the casing 1 is formed with peripheral flat portions 3A and 3B.
Welding projections 2A and 2B are formed on A and 3B.

The protrusions 2A and 2B are formed around the entire periphery of the adsorbent chambers 7A and 7B for accommodating the adsorbent for adsorbing the fuel vapor, and walls 8A and 8B are provided near the inside thereof. Rooms (hollows) 9A and 9B are formed between the projections 2A and 2B as welding parts, the walls 8A and 8B, and the lower surfaces of the filters 4A and 4B described later, respectively. The volumes of the rooms 9A and 9B are formed to be equal to or larger than the volumes of the protrusions 2A and 2B.

As shown in FIG. 3, the filter 4A (4B)
Is placed on the flat portion 3A (3B), and the projection 2A (2B) and the filter 4A (4B) are welded (welded) by applying a cylindrical ultrasonic horn H for ultrasonic welding.

Since the projection (welded portion) 2A falls down toward the room 9A by the action of the taper 10A formed on the side opposite to the room 9A, the generated burrs are securely accommodated in the room 9A.
The room 9A is a room sealed by welding.

Since the wall 8A is provided so as to surround the outer periphery of the diffusion chamber 14 connected to the purge port 13, the projection 2A serving as a welded portion and the purge port 13 eventually result in the wall 8A.
Will be isolated.

Therefore, the first check valve 6A and the second check valve 6B communicating with the fuel reservoir chamber 12 connected to the tank port 11 do not become clogged due to burrs during welding, and the diffusion chamber connected to the purge port 13. No burrs enter 14 and flow out to the engine. The first check valve 6A is a negative pressure valve for controlling the internal pressure of a fuel tank (not shown), and the second check valve 6B is a positive pressure valve for controlling the positive pressure of a fuel tank (not shown).

Reference numeral 15 denotes an atmospheric port. The adsorbent chambers 7A and 7B are filled with an adsorbent such as activated carbon, and the canister is assembled by mounting another cover member (not shown) on the upper part of the casing 1 in the figure.

The room for storing the burrs may be provided not only on the inner side but also on the outer side of the projection. In the examples, PA66 nylon was used for the casing, and polyester and rayon mixed nonwoven fabric was used for the filter.

Ultrasonic or friction welding can be used for welding (welding), and the filter can be easily attached to a resin casing. A cap 20 is welded to the lower end of the casing 1 in FIG. 1B so as to cover the fuel reservoir 12. In order to weld the cap 20 to the casing 1, the casing 1 is turned upside down (vehicle mounted state) from the posture of FIG. 1B, and the projection of the cap 20 is placed on the projection 1 </ b> A of the casing 1 as shown in FIG. 20
A is abutted, and the cap 20 is vibrated to the left and right in the figure to vibrate weld both projections.

Since one projection 1A of the vibration welding portion has an asymmetric shape inclined toward the chamber 12 which is inside the casing 1, the welding burr 5A is positively moved outwardly of the casing 1 as shown in FIG. Occurs and does not occur inward. Therefore, since the welding burrs do not fall off and enter the inner fuel reservoir 12, there is no danger that the burrs bite into the check valve or flow into the engine from the check valve through the diffusion chamber 14.

[Embodiment 2] FIG. 6 shows an embodiment in which the shape of the welded portion for welding the cap 20 to the casing 1 is different.
By forming the lower end of the zero projection 20A as an asymmetric inclined surface as shown in the drawing, burrs during welding are actively generated outside the casing 1. In the second embodiment, a diagram showing a state after welding is not prepared.

As described above, in both embodiments, the cap 2
The welding burrs are prevented from dropping toward the inside of the casing when the welding burrs are welded to the casing 1 to prevent the burrs from flowing out to the engine through the check valve or being caught in the check valve.

The cap 20 described with reference to FIGS.
In the case of welding, the walls 8A and 8A described with reference to FIGS.
As in the case of B, a wall 8C is provided near the projection 1A to isolate the welded portion from the fuel reservoir 12 connected to the tank port, so that the fuel reservoir 12 inside the welding burr 5A can be reliably inserted into the fuel reservoir 12. Can be prevented. Therefore, there is no fear that the check valve is caught by the burr, and further, there is no fear that the burr flows out to the engine through the diffusion chamber 14. Wall 8C thus insulates the weld from the purge port.

[0029]

Since the canister of the present invention is constructed as described above, burrs generated from the welded portion do not flow into the engine through the purge port, and can also enter the check valve and bite. Absent.

Further, the burrs do not overflow from the room, flow into the engine, or enter the check valve. Furthermore, the generated burrs can be securely accommodated in the room and sealed.

Thus, even if burrs are generated at the welded portion, it is possible to reliably prevent the engine and the check valve from being adversely affected, and to realize a highly reliable canister.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a bottom view and FIG. 1B is a sectional view taken along the line AA of FIG.

FIG. 2 is an enlarged view of a part (part B) of the casing of the embodiment of FIG.

FIG. 3 is a view showing how a filter is welded to the casing of FIG. 2, and is an enlarged view of a portion B in FIG. 1 (b).

FIG. 4 is an enlarged view of a portion C in FIG. 1B of the embodiment of the present invention,
FIG. 4 is a view of an upside-down posture, showing a state before cap welding.

FIG. 5 is a view showing a state after cap welding in the view of FIG. 4;

FIG. 6 is a view corresponding to FIG. 4 of another embodiment of the present invention.

FIG. 7 is an enlarged view showing a shape of a casing when applied to a conventional canister.

FIG. 8 is a diagram illustrating generation of burrs when a filter is welded to the casing of FIG. 7 in the related art.

FIG. 9 is an enlarged view showing a cap welding portion according to the prior art, showing an aspect before welding.

FIG. 10 is a view showing a state after welding of the prior art of FIG. 9;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2A, 2B Projection (welding projection) 3A, 3B Peripheral flat part 4A, 4B Filter 6A, 6B Check valve 7A, 7B Adsorbent room 8A, 8B, 8C Wall 9A, 9B Room 10A Taper 11 Tank port 12 Fuel Reservoir 13 Purge port 14 Diffusion chamber 15 Atmospheric port 20 Cap

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[Procedure amendment]

[Submission date] December 16, 1999 (1999.12.
16)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008]

According to one aspect of the present invention, there is provided a casing, an adsorbent chamber provided inside the casing and containing an adsorbent for adsorbing fuel vapor, and an engine. A canister having a purge port connected to the intake port of the fuel tank, a tank port connected to the fuel tank, and an atmosphere port opened to the atmosphere, and having a filter between the ports and the adsorbent chamber. A wall is provided in the vicinity of the welded portion so as to separate the purge port from a welded portion for welding the filter and the casing with the welded protrusion, and the welding protrusion is opposed to the wall in the vicinity of the welded portion.
A canister characterized by having a taper on the opposite side .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

In the present invention, since the wall provided near the welded portion separates the welded portion of the casing from the purge port, burrs generated from the welded portion flow out to the engine through the purge port, or the inside of the check valve. To prevent intrusion into Further, due to the taper formed on the welding projection,
Between the welding projection and the wall.
Burrs can be securely stored. The invention described in claim 2 is a contract
In the invention according to claim 1, the welded portion and the wall near the welded portion and the filler
A part with a volume equal to or larger than the welding projection
It is characterized by forming a shop. With this invention
In addition, the burrs generated from the welded part
From the room formed between the nearby wall and the bottom of the filter
Spills out, burrs leak into the engine, or inside the check valve
It is possible to reliably prevent the user from entering the portion and biting.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

According to a third aspect of the present invention, there is provided a casing, an adsorbent chamber provided inside the casing for containing an adsorbent for adsorbing fuel vapor, a purge port connected to an intake port of an engine, and a fuel tank. In a canister having a tank port to be connected and an atmosphere port opened to the atmosphere and having a cap welded to the casing, welding burrs generated at a welded portion of the casing and the cap are positively formed on the outside of the casing. A canister characterized in that the shape of the welded portion is asymmetrical so as to occur.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

According to a fourth aspect of the present invention, in the canister of the third aspect, the welding portion is isolated from the purge port.
It is characterized in that a wall is provided near the welded portion.
According to the present invention, the wall provided near the welded portion reliably prevents the welding burrs from falling into the inside of the casing, thereby more reliably preventing the check valve from being defective due to the welding burrs and the leakage of the welding burrs to the engine. I do.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Deleted

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Deleted

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Deleted

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Kato 1-1, Kyowa-cho, Obu City, Aichi Prefecture Inside Ai San Industry Co., Ltd. (72) Inventor Hideo Yamada 1-1-1, Kyowa-cho, Obu City, Aichi Prefecture 1 Ai San Kogyo Co., Ltd. (72) Inventor Tadayoshi Tominaga 1-1-1 Kyowa-cho, Obu City, Aichi Prefecture Ai San Kogyo Co., Ltd. (72) Masaharu Nagasaka 1-1-1 Kyowa-cho, Obu City, Aichi Prefecture 1 Ai San Kogyo Co., Ltd. (72) Inventor Mitsaku Terada 1-1, Kyowacho, Obu City, Aichi Prefecture 1 Ai San Kogyo Co., Ltd. (72) Inventor Shinsuke Kiyomiya 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Auto Inside the car company

Claims (5)

[Claims] 1. A casing, an adsorbent chamber provided in the casing and containing an adsorbent for adsorbing fuel vapor, a purge port connected to an intake port of an engine, and a tank port connected to a fuel tank. And a canister having an atmosphere port opened to the atmosphere and having a filter between each port and the adsorbent chamber, wherein a welding portion for welding the filter and the casing with a welding projection and a purge port are provided. A canister characterized in that a wall is provided near a welded portion so as to be isolated. 2. A casing, an adsorbent chamber provided in the casing and containing an adsorbent for adsorbing fuel vapor, a purge port connected to an intake port of an engine, and a tank port connected to a fuel tank. In a canister having an air port opened to the atmosphere and having a cap welded to the casing, welding burrs generated at a welded portion between the casing and the cap are positively generated outside the casing, A canister characterized by an asymmetrical welded portion. 3. A wall is provided near the welded portion so as to isolate the welded portion from the purge port.
The canister as described. 4. The canister according to claim 1, wherein a room having a volume equal to or larger than the volume of the welding projection is formed between the welding portion, a wall near the welding portion, and the lower surface of the filter. 5. The canister according to claim 4, wherein the welding projection has a taper on a side opposite to a wall near the welding portion.