JPH0332773Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention discharges evaporated fuel generated in the fuel tank or the float chamber of the carburetor to the air cleaner through the evaporated fuel processing passage, and releases it into the combustion chamber of the engine body. The present invention relates to an evaporative fuel processing device that sucks fuel together with an air-fuel mixture and burns it.

(Prior Art) As shown in Fig. 1 (see Japanese Utility Model Publication No. 51-44805), this type of evaporative fuel processing device is of a type in which the evaporative fuel processing passage b of the canister a is connected to the dirty side space e of the air cleaner d. There are two types: one in which the processing passage is connected to the clean side space of the air cleaner.

In the latter type, when a large amount of evaporated fuel is generated while the engine is stopped in a car such as a cab-over type car where the engine room easily becomes hot, this evaporated fuel flows into the intake air via the clean side space. Since it accumulates in the passageway, there is a problem in that when the engine is restarted, overburden occurs, impairing the smoothness of the restart.

The former method has the advantage of not having such problems. By the way, in vehicles such as cab-over type automobiles where it is difficult to take up sufficient space in the engine room, a rigid cylindrical air cleaner as shown in Figs. 2 and 3 is used, and the air cleaner inlet is connected to the air cleaner. There is something installed at the bottom of the.

(Problem to be solved by the invention) As described above, the air cleaner inlet is provided at the bottom of the air cleaner, and the evaporated fuel processing passage is connected to the dirty side space of the air cleaner, allowing smooth restart. On the other hand, dust and moisture in the air taken into the air cleaner from the suction port are likely to enter the processing passage, and the processing passage may be blocked by these.
There is a drawback that the evaporated fuel may not be processed smoothly.

(Means for solving the problem) The present invention aims to eliminate the above drawbacks,
An evaporative fuel processing passage is provided in the dirty side space of a cylindrical air cleaner in which an air cleaner element is fixed to the inner surface of the air cleaner side wall via a seal member at its upper peripheral edge so that the upper space becomes a clean side space and the lower space becomes a dirty side space. In the evaporative fuel processing device to which the evaporative fuel processing passage is connected, the evaporative fuel processing passage is configured such that its tip opening opens into the gap formed between the side circumferential surface of the air cleaner element and the inner surface of the air cleaner side wall, and The air cleaner element is characterized in that the opening is opened at a position below the bottom surface of the air cleaner element.

(Function) According to the present invention, since the evaporative fuel processing passage is configured such that its tip opening opens into the gap formed between the side circumferential surface of the air cleaner element and the inner surface of the air cleaner side wall, the tip The evaporated fuel supplied to the dirty side space from the opening flows into the lower space of the dirty side space through the gap, flows upward from the bottom surface of the air cleaner element, and reaches the clean side space. The tip opening of the evaporated fuel processing passage opens into the gap, and the air cleaner inlet is opened at a position below the bottom surface of the air cleaner element, so the air cleaner element acts as a baffle plate, and the air cleaner inlet Dust and moisture in the air taken into the dirty side space can be prevented from entering the evaporated fuel processing passage, and the air taken in from the air cleaner intake port can smoothly flow.

(Embodiment) The first embodiment shown in FIG. 2 is configured so that the evaporated fuel generated in the fuel tank 1 is guided to the dirty side space 5 of the air cleaner 4 through the evaporated fuel processing passage 2. A breather valve 14 is arranged in the middle of the evaporated fuel processing passage 2.

The tip opening 3 of the evaporative fuel processing passage 2 opens in a gap formed between the inner surface of the side wall 15 of the air cleaner 4 and the side circumferential surface 6a of the air cleaner element 6, facing the side circumferential surface 6a, and It communicates with dirty side space 5.
The air cleaner element 6 is formed so that its side peripheral surface 6a approaches the tip opening 3. The distance H between the two is the air cleaner element 6
The air cleaner intake port 11 is set at a level sufficient to prevent the air flow taken into the dirty side space 5 from directly flowing into the evaporated fuel processing passage 2 through the air cleaner intake port 11 which opens at a position below the bottom surface of the air cleaner inlet 11 . As shown in FIG. 2, the tip opening 3 is located above the air cleaner suction port 11 and is not located on the axis of the air cleaner suction port 11 in the suction direction.

The internal space of the cylindrical air cleaner 4 is formed into a dirty side space located below and to the side by an air cleaner element 6 and a seal member 9 interposed on the upper periphery of the air cleaner element 6 and fixed to the side wall 5. 5 and a clean side space 10 located above the dirty side space 5, an air cleaner intake port 11 for taking in air is connected to the dirty side space 5, and a connecting pipe connected to the engine body side is connected to the clean side space 10. 12 are connected.

In the second embodiment shown in FIG. 3, evaporated fuel generated in a fuel tank or evaporated fuel generated in a float chamber of a vaporizer is introduced into a canister 16 equipped with a charcoal adsorption layer 7 through an evaporated fuel introduction pipe 8. I'm putting it in. This canister 16 may receive both evaporated fuel generated in the fuel tank and in the carburetor float chamber.

The evaporated fuel temporarily adsorbed on the charcoal adsorption layer 7 of the canister 16 passes through the evaporated fuel processing passage 2 on the airflow flowing in from the atmosphere opening pipe 13 during engine operation, and then is led out to the dirty side space 5 of the air cleaner 4. Ru. In this embodiment, the tip opening 3 of the processing passage 2 is connected to the side peripheral surface 6a of the air cleaner element 6 in the dirty side space 5.
into the gap formed between the air cleaner element 6 and the inner surface of the air cleaner side wall.
It is disposed close to the side circumferential surface 6a in the same manner as in the first embodiment.

(Effect of the invention) Since the present invention has the above configuration, even though it is a rigid cylindrical air cleaner and the air cleaner inlet and the evaporative fuel processing passage are connected to the dirty side space at the bottom. First, it is possible to prevent dust and moisture in the air taken into the dirty side space of the air cleaner from entering the evaporative fuel processing passage. Therefore, the processing passage can be prevented from being blocked by dust or moisture in the air, and the evaporated fuel can be processed smoothly.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram showing an evaporative fuel processing apparatus published in Japanese Utility Model Publication No. 51-44805, and FIGS. 2 and 3 are schematic explanatory diagrams showing an embodiment of the present invention. 2... Evaporated fuel processing passage, 3... Tip opening,
4... Air cleaner, 5... Dirty side space, 6... Air cleaner element, 6a... Side peripheral surface, 9... Seal member, 10... Clean side space, 11... Air cleaner inlet, 15...
side wall.

Claims (1)

[Scope of utility model registration request] An evaporative fuel processing passage is provided in the dirty side space of a cylindrical air cleaner in which an air cleaner element is fixed to the inner surface of the air cleaner side wall via a seal member at its upper peripheral edge so that the upper space becomes a clean side space and the lower space becomes a dirty side space. In the evaporative fuel processing device to which the evaporative fuel processing passage is connected, the evaporative fuel processing passage is configured such that its tip opening opens into the gap formed between the side circumferential surface of the air cleaner element and the inner surface of the air cleaner side wall, and A vaporized fuel processing device characterized in that an opening is opened at a position below the bottom surface of an air cleaner element.