JPS594820Y2 - Fuel tank mounting structure - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a mounting structure for a fuel tank.

There is a conventional fuel tank mounting structure as shown in Fig. 1, in which the fuel tank a is attached to the rear floor C via several bands b. When an impact force acts on the fuel tank a, such as in the case of a rear-end collision, the fuel tank a contacts the ground or is interfered with by the suspension cross member d, causing cracks and fuel leakage. The problem is that it can be extremely dangerous.

This invention aims to solve these problems, and even if the fuel tank is subjected to an impactful external force or inertial force during a vehicle accident, the fuel tank and nearby vehicle body components will not interfere with each other. An object of the present invention is to provide a fuel tank mounting structure which improves safety by preventing fuel leakage by sufficiently preventing fuel leakage.

For this reason, the fuel tank mounting structure of the present invention includes a fuel tank disposed at the rear of the vehicle body and a rear frame extending longitudinally on the side of the vehicle body, so that the fuel tank is protected against impact from external forces. Fuel tank mounting in which the fuel tank should be mounted with a protective surface on the side facing the upper corner of the fuel tank in order to prevent interference with nearby vehicle body structural members when receiving inertial force. A curved plate-shaped protector having a lower surface is attached to the rear frame, and the fuel tank is mounted and supported on the rear frame via the protector.

Hereinafter, a fuel tank mounting structure as an embodiment of the present invention will be explained with reference to the drawings. Fig. 2 is a plan view thereof;
Figure 3 is a cross-sectional view of the main part along line II-III in Figure 2, Figures 4 and 5 show the protector, Figure 4 is its perspective view, and Figure 5 is its plan view. be.

As shown in FIG. 2, in the rear part A of the vehicle body, a pair of left and right rear frames 1 and 2 extend in the front-rear direction, that is, the longitudinal direction, at the side portions of the vehicle body.

In addition, at the rearmost ends 1a and 2a of each rear frame 1 and 2,
A rear end cross member 3 is connected via a bracket, and thereby the rear end cross member 3 connects the rear frames 1 and 2 in the left-right direction.

Further, each of the rear frames 1 and 2 is curved toward the side of the vehicle body at intermediate portions 1b and 2b extending from the front to the rear.

Therefore, the left and right rear frames 1 and 2 and the rear end cross member 3 constitute a frame that can accommodate an expanded trunk room in the rear part A of the vehicle body, and on this frame,
As shown in FIG. 3, the rear floor panel 4 is connected by means such as spot welding.

Note that since the curved portion of the rear frame is difficult to construct as a single plate, its outer portion is constructed with a reinforcement 5 so that the entire rear frame has a U-shaped cross section.

This rear floor panel 4 has a recess (not shown) in the front part for storing the lower part of a spare tire that is placed upright, and other than that, only small uneven parts are formed for reinforcement. Macroscopically, most of the rear floor panel 4 is formed as a flat portion, and a fuel tank 6 is disposed below the flat portion of the rear floor panel 4.

By the way, since the rear floor panel 4 has a recess only in the front part and the rest is configured as a flat part, the distance from the rear floor panel 4 to the ground is generally smaller than that of the conventional one shown in FIG. However, the distance between the bottom surface of the fuel tank 6 disposed below the rear floor panel 4 and the ground cannot be reduced for safety reasons, so the thickness of the fuel tank 6 can be increased. The thickness is necessarily thinner than the conventional one shown in FIG.

In order to compensate for the reduced capacity due to the thinner fuel tank 6, the bottom area of the fuel tank 6 is increased in the longitudinal and lateral directions of the vehicle body.
2 is curved toward the side of the vehicle body at portions 1b and 2b extending from the front to the rear, and the rear end cross member 3 is connected to the rear ends 1a and 2a of the rear frames 1 and 2, so that the fuel tank 6 The fuel tank 6 can be disposed below the rear floor panel 4 by sufficiently absorbing the increase in the bottom area.

Therefore, the trunk room 7 can be expanded while ensuring a sufficient capacity of the fuel tank 6.

By the way, as shown in FIGS. 3 to 5, a fuel tank mounting surface 8b having a fuel tank protective surface 8a on the side facing the upper corner portion 6a of the fuel tank 6 and to which the fuel tank 6 is to be attached is provided.
A curved plate-shaped protector 8 having a lower surface portion thereof is attached to the rear frame 1. On the lower surface of this protector 8, a flange e a/ at an upper corner portion 6a of the fuel tank 6 is attached to a bolt 9 and a nut 10. As a result, the fuel tank 6 is supported by the rear frame 1 via the protector 8 while at least its upper corner portion 6a is protected by the fuel tank protection surface 8a of the protector 8. There will be.

Therefore, even if the vehicle receives a shocking external force on the fuel tank 6 due to a rear-end collision from a following vehicle, or a shocking inertial force on the fuel tank 6 due to a collision with a vehicle in front, the fuel tank 6 Since it is sufficiently protected by the protector 8, it will not interfere with vehicle body components such as the rear frame 1 or suspension cross member (not shown) disposed nearby, or come into contact with the ground. There is no possibility of fuel leakage due to damage, and safety is greatly improved.

Furthermore, the protector 8 is used as a bracket to attach the fuel tank 6, and since the protector 8 has a curved plate shape and is attached to a component of the rear frame 1, the protector 8 also functions as a reinforcing member. This means that

The fuel tank 6 is supported by the rear frame 1 through the protector 8 at its flange 6a' at the upper corner 6a, and other parts are mounted and supported by the rear floor panel 4 and rear end cross member 3 as appropriate. Therefore, if parts other than the upper corner part 6a of the fuel tank 6 are also protected with a protector, safety can be further increased.

Further, although the rear frames 1 and 2 are constructed by appropriately combining the curved portions 1b and 2b with other members 5, it is also possible to construct the entire rear frame from a single plate. It is.

Further, as shown in FIG. 2, rear side frames 11 are connected at their bases in parallel to a portion IC near the front end of the rear frame 1.
is configured to mainly reinforce torsional rigidity, and the portion IC near the front end of rear frame 1 is configured to primarily reinforce bending rigidity.

Similarly to the case of the rear frame 1 described above, the portion 2C near the front end of the rear frame 2 is also
The rear side frame may be connected in parallel with the rear side frame.

As described in detail above, according to the fuel tank mounting structure of the present invention, the fuel tank mounting surface to which the fuel tank 6 is to be mounted has the protective surface 8a on the side facing the upper corner portion 6a of the fuel tank 6. Curved plate-shaped protector 8 having 8b on the lower surface
is attached to the rear frame 1, and the fuel tank 6 is mounted and supported on the rear frame 1 via the protector 8. Therefore, when the fuel tank 6 receives an impactful external force or inertial force, the protector 8 The upper corner portion 6a of the fuel tank 6 can be protected by the protective surface 8a, thereby reliably preventing interference between the fuel tank 6 and nearby vehicle body components. There is no risk of fuel leaking due to cracks forming in the fuel cell, and the structure is simple, resulting in a significant improvement in safety.

Furthermore, since the protector 8 is used as a bracket to attach the fuel tank 6, and the protector 8 is curved and attached to the rear frame 1, the protector 8 can also be used as a reinforcing member.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a conventional fuel tank mounting structure, and Figs. 2 to 5 show a fuel tank mounting structure as an embodiment of the present invention, and Fig. 2 is a plan view thereof; FIG. 3 is a sectional view of the main part along line III-III in FIG. 2,
4 and 5 show the protector, FIG. 4 being a perspective view thereof, and FIG. 5 being a plan view thereof. 1.2...Rear frame as a vehicle body component, 1a
, 2a...-Rear frame l, 2 (7) rearmost end, lb
. 2b...Curved intermediate portions of the rear frames 1 and 2 going from the front to the rear, 1c, 2c...Rear frames 1.
2. Part near the front end of 2, 3... Rear end cross member 4... Rear floor panel, 5... Reinforcement, 6... Fuel tank, 6a... Upper corner of fuel tank 6, 6a '...Flange, 7...Trunk room, 8...Protector, 8a...Protector 8
8b...Fuel tank mounting surface of protector 8, 9...Bolt, 10...Nut, 11
...Rear side frame.

Claims (1)

[Scope of utility model registration request] It has a fuel tank disposed at the rear of the vehicle body and a rear frame extending longitudinally on the side of the vehicle body, and when the fuel tank is subjected to an impactful external force or inertial force, the vehicle body structural members in the vicinity In order to prevent interference with the fuel tank, a curved plate-shaped protector is provided, which has a protective surface on the side facing the upper corner of the fuel tank and a fuel tank mounting surface on the lower surface to which the fuel tank is attached. , wherein the fuel tank is attached to the rear frame, and the fuel tank is mounted and supported on the rear frame via the protector.
Fuel tank mounting structure.