JPH0353010Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to a canister for preventing fuel to be supplied to an internal combustion engine from evaporating and being discharged into the atmosphere.

<Prior Art> Generally, an internal combustion engine is provided with a fuel reservoir such as a fuel tank or a float chamber of a carburetor, and the spaces in these fuel reservoirs are communicated with the atmosphere to maintain pressure balance. It's getting old. However, since the evaporated fuel is discharged into the atmosphere from this communicating portion to the atmosphere side, a canister for recovering the evaporated fuel is provided in this communicating portion.

This canister is, for example, shown in Japanese Utility Model Application Publication No. 55-23406, in which an inlet pipe, an outlet pipe, and an atmosphere communication hole are formed in a container filled with a fuel adsorbent such as activated carbon. The pipe communicates with a space in a fuel reservoir such as a fuel tank or a float chamber of a carburetor, and the exhaust pipe communicates with an intake passage of an internal combustion engine. The vaporized fuel introduced into the container from the introduction pipe is adsorbed by the adsorbent and is prevented from being discharged from the atmosphere communication hole, and the fuel adsorbed by the adsorbent is removed as the internal combustion engine operates. The resulting negative pressure causes
The adsorbent is separated from the adsorbent by air introduced through the atmosphere communication hole, sucked into the intake passage, and then combusted within the cylinder.

By the way, activated carbon has very brittle and weak properties. Therefore, in actual use, a cushioning material such as felt or a partition plate with a spring effect is used above or below the activated carbon to prevent the activated carbon from being worn out or damaged by vibrations from vehicles or the like. This method of use is effective for small canisters with a canister capacity of up to 2, but a large canister with a capacity exceeding 2 has a problem in that it becomes impossible to prevent wear and damage of the internal activated carbon.

Therefore, the present invention aims to prevent wear and damage by dividing activated carbon into small volumes and using the partition material as a cushion material with good air permeability.

<<Means for Solving the Problems>> In order to achieve the above object, the present invention provides an atmosphere communication hole provided at one end of the container in the axial direction, and an evaporative fuel vent provided at the other end of the container in the axial direction. In the canister having an inlet/outlet pipe and an adsorbent filled in the container, a plurality of breathable cushion materials are arranged at predetermined intervals in the container and perpendicular to the axial direction of the container. The adsorbent storage section in the container is separated into a plurality of small chambers along the direction of passage of the evaporated fuel.

<<Function>> With the above-described structure, the canister of the present invention is able to suppress the movement of the adsorbent by separating the adsorbent with the cushion material. Density can be made almost uniform. Further, the vaporized fuel moves in all directions within the cushion material due to the air permeability of the adsorbent, and is supplied throughout the adsorbent.

<<Example>> Hereinafter, an example of the present invention will be described in detail based on the drawings.

That is, FIGS. 1 and 2 show a canister 10 showing an embodiment of the present invention. This canister 10 has a cylindrical container 12 with both ends closed, and punching plates 14 are provided at both ends of the container 12. ,14
It is partitioned by filters 15 and 15a reinforced by a dome a, and activated carbon 16 as an adsorbent is filled between these filters 15 and 15a. Said container 1
An introduction pipe 20 and a discharge pipe 22 are provided approximately at the center of one closed end 12a (lower side in the figure) of 2. The introduction pipe 20 and the discharge pipe 22 communicate with a space _S1 formed between the closed end 21a and the filter 15. The introduction pipe 20 is connected to a fuel tank interior space (not shown) serving as a fuel reservoir, a carburetor float interior space (not shown), or both of these spaces, and the discharge pipe 22 is connected to a fuel tank interior space (not shown) serving as a fuel reservoir. The intake passage of the internal combustion engine is communicated with, for example, the upstream side of the throttle valve. Furthermore, the container 1
An atmosphere communication hole 24 is formed at approximately the center of the other closed end 12b (upper side in the figure) of the second closed end 12b of the filter _15a. is communicated with.

Here, in this embodiment, inside the container 12,
A plurality of cushion members 30 are arranged perpendicularly to the axial direction.
are placed at predetermined intervals. As a result, the activated carbon 16 storage portion within the container 12 is separated into a plurality of small chambers along the passage direction of the evaporated fuel. The cushion material 30 is made of a breathable material such as felt or urethane. In this embodiment, three cushion materials 30 are used, and the storage portion for the activated carbon 16 is divided into approximately four equal parts. Note that the number of such cushion materials 30 is not limited to three, and may be determined depending on the capacity of the activated carbon storage section, and may be one, two, or four or more.

With the above configuration, in the canister 10 of this embodiment, the evaporated fuel introduced into the container 12 from the introduction pipe 20 passes in the direction of the atmosphere communication hole 24, that is, through the filters 15 and 15a, the activated carbon 16, and the cushion material 30. The fuel vapor flows in the direction of the central axis of the container 12, and at this time, the fuel in the evaporated fuel flows into the activated carbon 1.
6 is adsorbed. Therefore, since the fuel is adsorbed by the activated carbon 16 in this way, only air is discharged into the atmosphere from the atmosphere communication hole 24.

Next, when the internal combustion engine operates, the negative pressure generated in the intake passage acts on the inside of the container 12 via the exhaust pipe 22, and the negative pressure at this time causes the atmospheric communication hole 2 to
When the air taken in from the activated carbon 16 passes through the activated carbon 16, the fuel adsorbed on the activated carbon 16 is separated from the activated carbon 16. The fuel thus separated is introduced into the intake passage through the exhaust pipe 22, and is supplied into the combustion chamber together with the air-fuel mixture.

In this embodiment, the activated carbon 16 is separated into a plurality of storage parts by the cushion material 30, so that movement of the activated carbon 16 due to vibrations or the like is effectively suppressed. Furthermore, the activated carbon 16 is compressed almost uniformly over the entire area due to the elastic force of the cushion material 30, and from this point of view as well, movement of the activated carbon 16 can be suppressed and wear and damage of the activated carbon 16 can be prevented. can. Furthermore, cushion material 3
Since the density of the activated carbon 16 can be easily made uniform by using 0, the work of storing the activated carbon 16 can be simplified and productivity can be improved. By the way, since the cushion material 30 has breathability, the evaporated fuel moves freely in all directions within the cushion material 30.
It is emitted from the entire surface of the activated carbon 16 and is almost evenly supplied to the entire activated carbon 16. Therefore, the activated carbon 16 can be used without waste, and the fuel adsorption efficiency can be greatly improved.

<<Effects of the invention>> As explained above, in the canister of the present invention, a plurality of breathable cushion materials are installed at predetermined intervals in the container in a direction perpendicular to the axial direction. Since the adsorbent storage section is separated into a plurality of small chambers along the passage direction of the evaporated fuel, movement of the adsorbent can be suppressed to prevent wear and damage of the adsorbent, and the adsorbent density can be reduced. It is possible to improve productivity by making it almost uniform. Furthermore, since the evaporated fuel passes through the cushion material in all directions and emanates from the entire surface of the cushion material,
This provides various excellent effects such as being able to utilize the entire adsorbent uniformly and significantly improving adsorption efficiency.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the canister of the present invention, and FIG. 2 is a plan view showing an embodiment of the canister of the present invention. 10... Canister, 12... Container, 16...
Activated carbon (adsorbent), 30...Cushion material.

Claims (1)

[Scope of utility model registration request] A canister having an atmosphere communication hole provided at one axial end of the container, an evaporative fuel introduction/input pipe provided at the other axial end of the container, and an adsorbent filled in the container, Inside the container, a plurality of breathable cushioning materials are installed at predetermined intervals perpendicular to the axial direction of the container, and the adsorbent storage part in the container is installed along the passage direction of the vaporized fuel. A canister characterized by being separated into multiple small chambers.