JPH0442515Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the structure of a canister placed horizontally in a vehicle to efficiently adsorb evaporated fuel from a float chamber of a carburetor.

(Prior art) In the engine room of a vehicle, a canister for adsorbing evaporated fuel from the fuel tank and the float chamber of the carburetor is mounted to the vehicle body at a position lower than the carburetor in order to efficiently adsorb evaporated fuel from the float chamber. The horizontal arrangement is disclosed in Japanese Patent Application No. 60-265534 proposed by the present applicant.

The canister is equipped with an air intake that is offset from the center line of the case on one end of the cylindrical case filled with adsorbent. The case is installed horizontally.

(Problem that the invention aims to solve) When purging the evaporated fuel adsorbed by the adsorbent, air is introduced from the air intake port to vaporize the adsorbed evaporated fuel, but this mainly causes the adsorbent below to vaporize. Because it is easily absorbed, the air intake must be located below the center line of the case and at the bottom of the case.

However, if a structure is adopted in which the case lid, which is offset from the case center line, is screwed onto the open end surface of the case body, it is difficult to position the air intake port relative to the case body while the case body is fixed to the vehicle body. It was difficult.

Therefore, the purpose of the present invention is to provide a horizontal canister structure for adsorbing evaporated fuel, in which the air intake port can be reliably and easily positioned at the lowest end of the case by utilizing the engagement between the case lid and the vehicle body. There is something to do.

(Means for Solving the Problems) In order to solve the above problems and achieve the purpose, the present invention provides an offset from the center line C of the cylindrical case on one end surface of the cylindrical case filled with the adsorbent 51. The atmosphere intake port 42 is provided with an air intake port 42 arranged as a
In the canister 20 for adsorbing evaporative fuel, the cylindrical case is horizontally attached to the vehicle body with the cylindrical case positioned below the center line C, the cylindrical case is connected to the air intake port 42 on the open end surface of the case body 21. The case lid 41 is rotatably assembled, and is characterized in that an engagement portion 47 with the vehicle body is provided in a portion of the case lid 41 near the air intake port 42.

More specifically, on the outer circumferential surface of the case lid 41, in the vicinity of the air intake port 42, there is a concave engaging portion 4 that engages with a convex engaging portion 73 provided on the vehicle body side.
7, and a plurality of insert-type fixing portions 32 are provided on the outer circumferential surface of the case body 21, corresponding to the types of support portions 82 provided on the vehicle body side.

(Function) When the canister 20 is mounted horizontally on the vehicle body, the case cover body 41 having the air intake port 42 is rotatably assembled to the open end surface of the case body 21 to form a cylindrical case, and the case Since the engaging part 47 with the vehicle body side is provided in the vicinity of the air intake port 42 of the lid body 41, the case body 21
By rotating and adjusting the case cover body 41, the positioning of the air intake port 42 with respect to the case body 21 can be easily performed, and the engaging part 47 can be moved to the engaging part 73 on the vehicle body side.
By simply engaging the air intake port 42, the air intake port 42 is reliably positioned at the lowermost end of the case.

Then, as in the embodiment, a concave engagement part 47 that engages with a convex engagement part 73 provided on the vehicle body is formed on the outer peripheral surface of the case lid 41 near the air intake port 42,
Furthermore, if a plurality of plug-in fixing parts 32 are provided on the outer peripheral surface of the case body 21 in accordance with the type of support part 82 provided on the vehicle body side, the case body 21 and the case lid body 41 can be rotated. By dynamic adjustment, the position of the air intake port 42 relative to the case body 21 and the position of the case fixing portion 32 relative to the vehicle body can be changed. Therefore, by engaging the concave engaging portion 47 of the case lid body 41 with the convex engaging portion 73 on the vehicle body side and inserting the fixing portion 32 of the case body 21 into the supporting portion 82 on the vehicle body side, the vehicle type and By changing the directions of the charge ports 22, 23 and purge port 24 in response to the difference in the mounting location, the canister 20 can be easily attached without requiring fasteners such as bolts while reliably positioning the air intake port 42 at the bottom of the case. Can be attached to the vehicle body.

(Example) Examples will be described below based on the accompanying drawings.

Fig. 1 shows the arrangement of the canister for adsorbing evaporated fuel in a longitudinal section, where 1 is the fuel tank, 2 is the intake passage to the engine (not shown), 3 is the intake pipe, 5 is the carburetor, 8 is the float chamber, and 9 is the throttle. The valve 20 is a canister. The intake pipe 3 has a fuel introduction port 4
is opened, a fuel nozzle 6 connected to a float chamber 8 is opened in the bench lily portion of the carburetor 5, and a negative pressure outlet 7 is opened downstream of the fuel nozzle 6 and near the upstream of the throttle valve 9. Also, on the ceiling of the canister 20 are first and second charge ports 22, 2.
3, purge port 24, and negative pressure inlet 27 are open.

The evaporated fuel from the fuel tank 1 passes through the first charge passage 11 to the first charge port 22, and the evaporated fuel from the float chamber 8 passes through the second charge passage 13.
are introduced into the canister 20 through the second charge port 23. Further, a check valve 12 is provided in the first charge passage 11, and a switching valve 14 is provided in the second charge passage 13, respectively.
The check valve 12 opens when the pressure inside the fuel tank 1 exceeds a certain value, and the switching valve 14 opens when the pressure inside the fuel tank 1 exceeds a certain value.
communicates with the inner vent passage 15 when the engine is running, and communicates with the second charge port 23 when the engine is stopped.

The purge port 24 is connected to the fuel introduction port 4 via the purge passage 16, and the negative pressure inlet 27 is connected to the negative pressure outlet 7 via the negative pressure passage 17. It is provided in the negative pressure chamber 26 of the negative pressure responsive valve 25 as shown in FIG. During engine operation, intake pulsation near the throttle valve 9 is introduced into the negative pressure chamber 26, and fuel components in the canister 20 are pumped from the purge port 24 to the purge passage 16 and the fuel introduction port 4 by the pumping action of the negative pressure responsive valve 25. through intake passage 2
is inhaled.

The canister 20 is a resin case body 2.
This is a cylindrical case consisting of a case cover body 41 and a case cover body 41, and is mounted horizontally on the vehicle body at a position lower than the carburetor 5 with its center line C inclined at 10 to 30 degrees with respect to the horizontal plane. In such an installed state, the case body 2
1 The first charge port 2 is installed in the ceiling in order from the top.
2. Second charge port 23, purge port 24
and a negative pressure introduction port 27 are arranged, each opening end being a third
As shown in the figure, they are provided facing in the same direction, and an air intake port 42 is provided at the lowermost end of the case lid 41.

The bottomed cylindrical case body 21 is filled with an adsorbent 51 such as activated carbon, and the chambers 28 and 29 on the ceiling of the case body 21 and the adsorbent 51 are separated by pads 52, grids 53, and filters 54. There is also a pad 55 between the chamber 43 in the case lid 41 and the adsorbent 51,
It is divided by a grid 56 and a filter 57.

The case lid 41 is rotatably assembled to the open end surface of the case body 21. That is, an annular member 61 is fixedly provided on the open end surface of the case body 21, an annular stopper 63 that protrudes inward is formed on the end surface of the annular member 61, and a circumferential stopper 63 is formed on the opposite end surface of the case lid 41. A large number (for example, 24) of stopper claws 45 are formed in the direction. Annular stopper 6
By inserting and engaging the stopper claw 45 into the case body 21, the case lid body 41 is rotatably combined with the case body 21.

As shown in FIG. 4, a concave engaging portion 47 cut out from the rear end is formed on the outer circumferential surface 46 of the case lid 41 in the vicinity of the air intake port 42. As shown in FIG.

Further, on the outer circumferential surface 31 of the case body 21, fixing parts 32, 35, which are fixed to the vehicle body side at different phases of 90 degrees, are fixed to the vehicle body side.
There are three types of 36. Each fixed part 32, 35,
36 has a tapered shape in plan view and is narrower on the case lid 41 side, and has a tapered shape in front view and has a wider bottom surface, and has irregular shapes in width etc. depending on the vehicle type and location. This allows you to visually confirm the difference. For example, as shown in the figure, the fixing part 32 consists of a member 33 on the ceiling side of the case body 21 and two members 34, 34 on the case lid 41 side, and the other fixing parts 35, 36 are made continuous.

On the other hand, FIGS. 5 and 6 show the supporting part and the engaging part on the vehicle body side, and a plate 81 is fixedly provided on the upper surface of the panel 71 at the bottom of the engine compartment.
1 is bent upward to form a convex engaging portion 73 that engages with the concave engaging portion 47, and the plate 81 has a supporting portion 82 into which the fixing portion 32 is inserted. It is formed. For example, the support part 82
The two members 83, 83 are bent inwardly and raised in contact with the tapered surfaces on both sides of the member 33 on the ceiling side of the case body 21 of the fixing part 32, and the case lid body 4.
Two members 8 bent inward to abut the tapered surfaces on both sides of the two members 34, 34 on the first side
It consists of 4.84. Further, the tip of the extending piece 85 from the plate 81 is curved upward to form the case body 21.
A stopper 8 that comes into contact with the end surface of the member 33 on the ceiling side
6 has been established.

The canister 20 is attached, for example, to the fixing part 3.
2, first adjust the rotation of the case lid 41 relative to the case body 21 to position the air intake port 42 on the extension of the fixed part 32, and then close the panel 7 on the vehicle body side.
Place canister 20 on top of 1. Then, insert the fixing part 32 into the support part 82 of the plate 81 as shown in FIG.
The concave engaging portion 47 of the case lid 41 is engaged with the plate 81, and the stopper 86 of the plate 81 is engaged with the tip end surface of the member 33 on the ceiling side of the case body 21 to prevent it from coming off.

When the canister 20 is mounted horizontally on the vehicle body in this way, a concave engagement portion 4 with the vehicle body is provided in the vicinity of the air intake port 42 of the cylindrical case.
7, and the concave engaging portion 47 is engaged with the convex engaging portion 73 on the vehicle body side, so that the air intake port 42 can be reliably positioned at the lowermost end of the case.

The canister 20 is a cylindrical case in which a case lid 41 having an air intake port 42 is rotatably assembled to the open end surface of the case body 21.
Since the case lid body 41 has a concave engaging portion 47 in the vicinity of the air intake port 42 on the outer circumferential surface, and the outer circumferential surface of the case body 21 has a plurality of fixing portions 32, 35, and 36, the case body 21 and the case The air intake port 42 to the case body 21 is adjusted by rotating the lid body 41.
and case fixing part 3 to the vehicle body side.
Charge ports 22, 23 by selecting ports 2, 35, and 36, that is, changing the installation surface position of the vehicle body support portion 82.
It is also possible to change the direction of the purge port 24.

Moreover, the case lid 4 is attached to the convex engaging portion 73 on the vehicle body side.
1 by engaging the concave engaging portion 47 of the support portion 8 on the vehicle body side.
By simply inserting the fixing part 32 of the case body 21 into the canister 20, the air intake port 42 can be reliably positioned at the bottom of the case, depending on the vehicle model and installation location, without the need for fasteners such as bolts.
can be easily attached to the vehicle body, and the stopper 86 and the member 33 on the ceiling side of the case body 21 can be easily attached to the vehicle body.
The canister 20 can be easily held to prevent it from coming off by engaging with the tip end surface.

(Effects of the invention) As described above, according to the invention, when the canister is mounted horizontally on the vehicle body, the case lid body equipped with the air intake port is rotatably assembled to the open end surface of the case body, and the canister is mounted horizontally on the vehicle body. It has a structure in which an engaging part with the vehicle body is provided in the vicinity of the air intake of the case lid body, and this engaging part is engaged with the engaging part on the vehicle body side, so that the case body and the case lid body are connected to each other. By adjusting the rotation, the air intake port can be easily positioned with respect to the case body, and the air intake port can be reliably positioned at the lowermost end of the case.

Furthermore, in the embodiment, a concave engaging part that engages with a convex engaging part provided on the vehicle body is formed on the outer circumferential surface of the case lid near the air intake port, and a concave engaging portion that engages with a convex engaging portion provided on the vehicle body is formed on the outer circumferential surface of the case body. There are multiple plug-in fixing parts depending on the type of support part, so by adjusting the rotation of the case body and case lid, you can change the position of the air intake in relation to the case body and the position of the air intake in relation to the vehicle body. It can accommodate changes in the position of the case fixing part. Therefore, by simply engaging the concave engaging part of the case lid with the convex engaging part on the vehicle body side and inserting the fixing part of the case body into the supporting part on the vehicle body side, it can be adapted to different vehicle models and mounting locations. By changing the direction of the charge port and purge port, the canister can be easily attached to the vehicle body without requiring fasteners such as bolts, while reliably positioning the air intake port at the bottom of the case.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the arrangement of the canister for adsorbing evaporated fuel, Fig. 2 is an enlarged longitudinal sectional view of the canister alone, Fig. 3 is a view in the direction of the arrow in Fig. 2, and Fig. 4 is in the same direction. 5 is a plan view of the support portion and the engaging portion on the vehicle body side, and FIG. 6 is a view in the direction of the arrow in FIG. In addition, in the drawing, 1 is the fuel tank, 2 is the intake passage,
4 is a fuel introduction port, 5 is a carburetor, 7 is a negative pressure outlet, 8 is a float chamber, 9 is a throttle valve, 20 is a canister, 21 is a case body, 22, 23 are charge ports, 24 is a purge port, 25 is a negative A pressure-responsive valve, 26 a negative pressure chamber, 27 a negative pressure inlet, 32,
35 and 36 are fixed parts, 41 is a case lid body, 42 is an air intake port, 47 is a concave engaging part, 51 is an adsorbent,
61 is an annular member, 71 is a panel, 73 is a convex engaging portion, 81 is a plate, 82 is a support portion, 86 is a stopper, and C is a center line.

Claims (1)

[Claims for Utility Model Registration] (1) An air intake port is provided on one end surface of a cylindrical case filled with an adsorbent and is offset from the center line of the cylindrical case, and the air intake port is located at an offset from the center line of the cylindrical case. In the canister for adsorbing evaporated fuel, the cylindrical case is horizontally attached to the vehicle body below the cylindrical case, and the cylindrical case rotates the case cover body provided with the atmospheric air intake to the open end surface of the case body. 1. A horizontal canister structure for adsorbing evaporated fuel, characterized in that the canister structure is movably assembled, and an engagement portion with a vehicle body is provided in a portion of the case lid near the air intake port. (2) In claim 1 of the utility model registration claim, a concave engaging portion that engages with a convex engaging portion provided on the vehicle body is provided on the outer circumferential surface of the case lid near the air intake port. A horizontal canister for adsorbing evaporated fuel, characterized in that the outer peripheral surface of the case body is provided with a plurality of insertable fixing parts corresponding to the types of support parts provided on the vehicle body side. structure.