JP4787337B2 - Canister mounting structure - Google Patents

Description

  The present invention relates to a canister mounting structure in a fuel evaporative emission control system.

  2. Description of the Related Art A fuel evaporative gas emission preventing device for preventing the emission of fuel evaporative gas generated in a fuel tank in a vehicle is known (see, for example, Patent Document 1).

The conventional fuel evaporative emission prevention device disclosed in Patent Document 1 temporarily stores fuel evaporative gas in a fuel tank in a canister, and when the engine is started, it is sucked into the intake system of the engine from the canister. is there.
In order to shorten the piping from the fuel tank to the canister, it is common to place the canister in the vicinity of the fuel tank. In particular, considering the installation space in the vehicle, it is preferable to arrange the fuel tank at the rear part of the vehicle body and the canister at the rear part. A conventional canister mounting structure will be described below.

6 (a) and 6 (b) are configuration diagrams of a conventional canister mounting structure, which is a re-display of FIGS. 1 and 2 of Japanese Patent No. 3241552. FIG. 2A is a side view of a rear portion of the vehicle 100 as viewed from the left side, and FIG. In addition, the code | symbol was reassigned.
In the rear part of the body frame 101 in the conventional vehicle 100, the cross member 103 is spanned between the left and right rear side frames 102, 102 extending in the front-rear direction. , 102. The subframe 104 is a member that supports a rear suspension (not shown).
A fuel tank 111 is disposed in front of the cross member 103, and a canister 112 is attached to the lower surface of the cross member 103. The canister 112 is disposed between the upper cross member 103 and the lower subframe 104.

Japanese Patent No. 3241552 (page 3-4, FIG. 1 to FIG. 3 and FIG. 5)

By the way, in the prior art described above, the canister 112 protrudes rearward from the cross member 103 and the subframe 104. When a collision object collides with the rear part of the vehicle 100 (hereinafter referred to as “at the time of rear collision”), the rear part 105 of the vehicle body is plastically deformed forward as shown by an imaginary line of (a) and hits the canister 112. .
The canister 112 is simply filled with an adsorbent such as activated carbon that adsorbs fuel evaporative gas, and even if it is damaged by collision energy, it can basically be used.

  However, even if some liquid fuel has entered the canister 112 from the fuel tank 111 for some reason, it is preferable that there is no leakage of the liquid fuel from the canister 112 at the time of a rear impact.

  Accordingly, an object of the present invention is to provide a technique capable of avoiding leakage of liquid fuel from a canister by further improving the protection performance of the canister.

In order to solve the above problems, the invention according to claim 1
In a mounting structure of a canister filled with an adsorbent that adsorbs fuel evaporative gas generated in a fuel tank, a vehicle body frame includes left and right rear side frames extending front and rear, and front and rear sides spanned between these rear side frames. Two cross members and a floor panel provided on the left and right rear side frames and the two front and rear cross members, and a canister is mounted on a rear portion of the vehicle body frame to support the rear suspension. Arranged between the front and rear ends of the attached subframe and between the left and right rear side frames so as to fit between the two front and rear cross members , the subframe and the left and right rear side frames are combined, and the front side than the coupling position of the subframe the left and right rear side frames, the sub-frame and the front Kurosumen Doo is by binding, are coupled to sub-frame connecting the left and right rear side frames and the front cross member,
Canister mounting structure characterized by this.

The invention according to claim 2 is characterized in that, in claim 1, the sub-frame is coupled to the front cross member on the inner side in the vehicle width direction than the left and right side frames .

The invention according to claim 3 is characterized in that, in claim 1, the canister is arranged below the floor panel and above the subframe .

According to the present invention as described above, the canister is mounted between the front and rear ends of the subframe attached to the rear portion of the vehicle body frame to support the rear suspension , and between the left and right rear side frames . Arranged so as to fit between the cross members , the sub frame and the left and right rear side frames are coupled, and the sub frame and the front cross member are coupled in front of the coupling position of the sub frame and the left and right rear side frames. Therefore, the canister, which is connected so that the sub frame connects the left and right rear side frames and the front cross member, is positioned between the front end and the rear end of the sub frame at a position with high rigidity between the front and rear cross members. When the vehicle has a collision from behind (during rear collision), the canister It can be easily and reliably protected. For this reason, since the protection performance of a canister can be improved more, the leakage of the liquid fuel from a canister can be avoided more reliably.
In addition, since the sub-frame that supports the rear suspension also serves as a canister protection member, a separate protection member is not required. Therefore, the protection structure of the canister can be simplified and the number of parts can be reduced.

It is a bottom view (the 1) of the vehicle rear part concerning the present invention. It is a bottom view (the 2) of the vehicle rear part concerning the present invention. FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. It is a left view of the vehicle rear part which concerns on this invention. It is a rear view of the vehicle rear part concerning the present invention. It is a block diagram of the conventional canister mounting structure.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
“Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right Indicates. The drawings are to be viewed in the direction of the reference numerals.

  FIG. 1 is a bottom view (No. 1) of a rear portion of a vehicle according to the present invention. A vehicle body frame 20 of the vehicle 10 is hung between left and right rear side frames 21 and 21 extending in the front-rear direction and these rear side frames 21 and 21. Two cross members (front cross member 22 and rear cross member 23) are provided.

  Further, the vehicle body frame 20 spans the foremost cross member 24 between the front ends of the left and right rear side frames 21 and 21, extends the left and right side sills 25 and 25 forward from the front ends of the left and right rear side frames 21 and 21, and Rear suspension damper housings 26, 26 are provided on the left and right sides of the rear side frames 21, 21.

Such a vehicle 10 has a fuel tank 30 disposed and mounted in a space S1 surrounded by the left and right rear side frames 21, 21, the front cross member 22 and the front cross member 24, that is, at the rear of the vehicle body. Thus, the canister 40 is arranged and attached at a substantially middle portion in the vehicle width direction of the space S2 surrounded by the left and right rear side frames 21, 21 and the front cross member 22 and the rear cross member 23.
That is, the canister 40 is, as will be described later, between the front end 54 and the rear end 55 of the subframe 50 attached to the rear portion of the vehicle body frame to support the rear suspension, and between the left and right rear side frames 21 and 21. Placed so that it fits.

The canister 40 is a constituent member of a fuel evaporative gas discharge prevention device that prevents the fuel evaporative gas generated in the fuel tank 30 from being discharged, and is filled with an adsorbent such as activated carbon that adsorbs the fuel evaporative gas.
The fuel evaporative emission prevention device is a device that temporarily stores the fuel evaporative gas in the fuel tank 30 in the canister 40 and sucks it from the canister 40 into the intake system of the engine when the engine is started. Since the canister 40 is disposed in the vicinity of the fuel tank 30, the piping from the fuel tank 30 to the canister 40 can be shortened.

  The canister 40 includes leg portions 42 and 43 extending left and right from a case 41 elongated in the vehicle width direction. On the other hand, the vehicle body frame 20 includes left and right stays 27 and 27 extending between the front and rear cross members 22 and 23 and extending in the front-rear direction. The canister 40 can be detachably attached to the vehicle body frame 20 from below by fixing the leg portions 42, 43 to the stays 27, 27 with bolts 44, 44. The width of the canister 40, that is, the dimension in the front-rear direction is A1. The left and right rear side frames 21 and 21 and the front cross member 22 have four sub-frame mounting bolt holes 28 (... Indicate a plurality, the same applies hereinafter) on the bottom surface. In the figure, 11 and 11 are left and right rear wheels.

FIG. 2 is a bottom view (No. 2) of the rear portion of the vehicle according to the present invention, and shows that a subframe 50 is attached to the rear portion of the vehicle body frame 20 and the canister 40 is disposed in front of the subframe 50.
The subframe 50 is a member having high rigidity that supports a rear suspension (not shown) (particularly, an upper arm and a lower arm of the rear suspension).

  More specifically, the sub-frame 50 is an elongated bar-shaped frame extending in the vehicle width direction, and both ends thereof can be fixed to the left and right rear side frames 21 and 21 with bolts 51 and 51. Further, the sub-frame 50 can extend the left and right leg portions 52 and 52 forward from the left and right front portions, and the ends thereof can be fixed to the front cross member 22 with bolts 51 and 51. In this way, the sub frame 50 can be detachably attached to the vehicle body frame 20 from below.

  As shown in FIG. 2, the front surface 53 of the sub-frame 50 has a generally arcuate shape from the vehicle width center portion 56 to the front ends 54 and 54 of the left and right leg portions 52 and 52. The canister 40 is surrounded by a space S3 formed by the width central portion 56 and the left and right leg portions 52, 52. That is, the rear portion and the left and right of the canister 40 can be surrounded by the subframe 50.

  The length in the front-rear direction from the front end 54 of the subframe 50 (that is, the front end 54 of the leg portion 52) to the rear end 55 is A2, which is larger than the dimension A1 in the front-rear direction of the canister 40 (see FIG. 1). The present invention is characterized in that the canister 40 is disposed so as to fit between the front end 54 and the rear end 55 of the subframe 50.

FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1 and shows that the vehicle body frame 20 includes a floor panel 60 provided on the left and right rear side frames 21 and 21 and the front and rear cross members 22 and 23. Show.
The left and right rear side frames 21 and 21 are higher in the rear half where the front and rear cross members 22 and 23 are bridged with respect to the front half where the fuel tank 30 is disposed. The lower surfaces 22 a and 23 a of the front and rear cross members 22 and 23 are higher than the fuel tank 30.

Further, FIG. 3 shows that the canister 40 is disposed after the front cross member 22 and in front of the rear cross member 23 and at a height contacting or substantially contacting the lower surface 61 of the floor panel 60. . The lower surface 45 of the canister 40 is slightly lower than the lower surfaces 22 a and 23 a of the front / rear cross members 22 and 23 and higher than the fuel tank 30.
In FIG. 3, the sub-frame 50 before being attached to the vehicle body frame 20 is also shown.

  As shown in FIG. 3, the subframe 50 is attached to the vehicle body frame 20, but the subframe 50 formed of an elongated bar-shaped frame extending in the vehicle width direction has a front cross member at the left and right front end portions 54. The left and right rear end portions 55 and 55 are fixed to the lower surfaces of the left and right rear side frames 21 and 21 with bolts 51 and the subframe 50 is attached to the vehicle body frame 20. .

  FIG. 4 is a left side view of the rear portion of the vehicle according to the present invention, and shows a configuration in which a fuel tank 30, a canister 40, and a subframe 50 are attached to the body frame 20.

  FIG. 5 is a rear view of the rear portion of the vehicle according to the present invention, and shows that the vehicle width center portion 56 of the subframe 50 is lowered to the vicinity of the lower surface 31 of the fuel tank 30.

As apparent from the above description, the mounting structure of the canister 40 has the following operations and effects.
As shown in FIG. 2, the canister 40 is disposed between the left and right rear side frames 21 and 21 so as to fit between the front end 54 and the rear end 55 of the subframe 50, so that there is a collision with the vehicle 10 from the rear. The canister 40 can be easily and reliably protected by the sub-frame 50 having a high rigidity when the rear side is in a rear collision. For this reason, since the protection performance of the canister 40 can be improved, the leakage of the liquid fuel from the canister 40 can be avoided more reliably.

  In addition, since the subframe 50 that supports the rear suspension also serves as a protection member for the canister 40, a separate protection member is not necessary. Therefore, the protection structure of the canister 40 can be made simple and the number of parts can be reduced.

  Furthermore, the periphery (front / rear / left / right) of the canister 40 is surrounded by the left and right rear side frames 21, 21 and the front / rear cross members 22, 23, and the lower part of the canister 40 is surrounded by the subframe 50. The protection performance can be further enhanced.

Still further, referring to FIGS. 3 to 5, in the present invention, the canister 40 is disposed after the front cross member 22 and before the rear cross member 23 and above the subframe 50. Further, the floor panel 60 is arranged at a height that is in contact with or substantially in contact with the lower surface 61 of the floor panel 60.
By disposing the canister 40 while avoiding the positions of the front / rear cross members 22, 23, the canister 40 can be disposed at a height that touches or substantially touches the lower surface 61 of the floor panel 60. Accordingly, the canister 40 can be arranged at a higher level.

By doing so, the canister 40 can be disposed higher than the fuel tank 30. For this reason, infiltration of the liquid fuel from the lower fuel tank 30 to the higher canister 40 can be avoided more reliably. As a result, leakage of the liquid fuel from the canister 40 can be avoided more reliably.
In addition, since the liquid fuel does not enter the canister 40, the performance of the adsorbent such as activated carbon filled in the canister 40 can be maintained in a good state for a long time.

  In the above-described embodiment of the present invention, only one of the front / rear cross members 22 and 23 may be provided.

  The canister mounting structure according to the present invention is suitable for a canister attached to a fuel tank of a vehicle.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 20 ... Body frame, 21 ... Rear side frame, 22, 23 ... Cross member (front / rear cross member), 30 ... Fuel tank, 40 ... Canister, 50 ... Subframe, 54 ... Front end of subframe, 55 ... rear end of subframe, 60 ... floor panel.

Claims (3)

In the canister mounting structure filled with the adsorbent that adsorbs the fuel evaporative gas generated in the fuel tank,
The vehicle body frame includes left and right rear side frames extending in the front-rear direction, two front and rear cross members spanned between the rear side frames, the left and right rear side frames, and the two front and rear crosses. A floor panel provided on the member,
The canister fits between two front and rear cross members between a front end and a rear end of a subframe attached to a rear portion of a vehicle body frame to support a rear suspension, and between the left and right rear side frames. Placed in
The sub frame and the left and right rear side frames are coupled, and the sub frame and the front cross member are coupled to each other in front of the coupling position of the sub frame and the left and right rear side frames. A frame is coupled so as to connect the left and right rear side frames and the front cross member ;
Canister mounting structure characterized by this. 2. The canister mounting structure according to claim 1, wherein the sub-frame is coupled to the front cross member on the inner side in the vehicle width direction than the left and right side frames . 2. The canister mounting structure according to claim 1, wherein the canister is placed below the floor panel and above the subframe .

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