FR3074731A1 - LOWER STRUCTURE OF VEHICLE - Google Patents

Abstract

A recess (13) set back from an upper side is formed in a side portion of a bottom surface of a fuel tank (10) in a lower vehicle structure, and the bottom surface of the fuel tank (10) comprises a lower bottom surface (15a) located in the lower part of the fuel tank (10), and an upper bottom surface (13a) located in the lower part of the recess (13) above the lower bottom surface (15a). A rear transmission shaft (37) overlaps the top bottom surface (13a) in top view, and a cartridge (20) is attached to the upper bottom surface (13a). The cartridge (20) and the rear transmission shaft (37) overlap at least in part in the width direction. The rear transmission shaft (37) is disposed between the cartridge (20) and the lower bottom surface (15a), and the cartridge (20) tilts in a direction in which it is further away from the transmission shaft. rear transmission (37) on its rear side.

Description

LOWER VEHICLE STRUCTURE [0001]

The present invention relates to a lower vehicle structure.

[0002]

There is a lower vehicle structure in which side members, a fuel tank, and the like are disposed under a floor panel, and a drive shaft extending in the longitudinal direction of the vehicle, and the like, are arranged in depending on the types of vehicles. As a fuel tank, a fuel tank mounted with a vehicle cartridge is known, as described in the patent literature 1, for example. The drive shaft is arranged so as to overlap on the fuel tank in top view and in side view.

[0003]

The vehicle cartridge is a device for adsorbing vapors such as gasoline so as not to discharge vapors from the fuel tank of a vehicle into the atmosphere, and is mounted on the bottom surface of the fuel tank in an example described in patent literature 1. In the bottom surface of the fuel tank, a recess recessed with respect to the upper side of the vehicle is provided, and the cartridge is arranged in the recess.

[0004]

The fuel tank recess also serves as a central tunnel for arranging the drive shaft. In such a case, the drive shaft and the cartridge are arranged side by side. A front end of the drive shaft is connected to a transfer, and a rear end of the drive shaft is mounted on an axle housing by means of a differential carrier and the like.

[List of Quotes]

- 1 [0005] [Patent literature 1] JP 2007-162539 A [0006]

In order to improve the adsorption performance of vapors or the like with the strengthening of the legal regulations concerning the quantities of evaporated gas generated, the size of a vehicle cartridge is increased, and the weight tends to increase with this increase in the cut. As the size of the cartridge increases, it is possible that an interval between the cartridge and the drive shaft, in particular an interval in the width direction of the vehicle, may be reduced.

[0007]

In a side collision, when a load directed inwards across the width of the vehicle acts on a rear wheel, a rear differential carrier moves towards one end across the width of the vehicle on the side opposite to a struck part. Then the rear end of the drive shaft attached to the rear differential carrier moves in the same direction.

[0008]

On the other hand, the transfer connected to the front end of the drive shaft is fixed to the lateral elements by a support and the like, and therefore, it is therefore unlikely that a significant change in position will occur at the time. of the side collision. As a result, the drive shaft rotates outward in the vehicle width direction with the transfer in the center, and tilts relative to the longitudinal direction of the vehicle.

[0009]

When the drive shaft moves as described above, the drive shaft may come into contact with the cartridge adjacent to the drive shaft.

-2When the propeller shaft comes into contact with the cartridge, a load acts on a cartridge fastener, and the fastener may be damaged, and it may be difficult to secure the cartridge stably. In addition, the cartridge body may be damaged.

[0010]

The present invention has been made in order to solve the above problems, and an object of the present invention is to provide a lower vehicle structure allowing stable attachment of a cartridge.

[0011]

In order to achieve the above objective, a lower vehicle structure according to the present invention comprises a fuel tank arranged under a floor panel, and extending in the direction of the vehicle width, and a drive shaft arranged under the floor panel, and extending in a longitudinal direction of the vehicle, in which a recess recessed with respect to the upper side of the vehicle is provided in a side part in the widthwise direction of the vehicle in a bottom surface of the tank fuel, and a cartridge is disposed in the recess, the bottom surface includes an upper bottom surface located in the recess, and a lower bottom surface disposed on a lower side of the vehicle relative to the upper bottom surface , and the drive shaft is arranged so as to overlap on the upper bottom surface when viewed from above, a pa rtie front of the drive shaft is connected to a transfer, and a rear part of the drive shaft is connected to a rear axle. In the lower vehicle structure, the cartridge and the drive shaft are arranged to overlap at least partially when viewed from the side, the drive shaft is disposed between the cartridge and the bottom underside in the direction of the width of

-3 vehicle, and the cartridge is arranged so as to tilt in a direction in which it is further from the drive shaft on its rear side of the vehicle.

[0012]

According to the present invention, it is possible to stably fix a cartridge.

[Figure 1] Figure 1 is a perspective view of a vehicle having a lower vehicle structure according to the present invention seen from a lower side and a front side of the vehicle.

[Figure 2] Figure 2 is a perspective view illustrating the periphery of a fuel tank of Figure 1.

[Figure 3] Figure 3 is a bottom view schematically illustrating the positional relationship between a fuel tank, a cartridge, a drive shaft, a transfer, and the like in Figure 1.

[Figure 4] Figure 4 is a schematic bottom view schematically illustrating the direction of inclination of the cartridge relative to the longitudinal direction (longitudinal direction of the vehicle) of the drive shaft of Figure 3.

[0014]

Hereinafter, a lower vehicle structure according to the present invention will be described with reference to the drawings (Figures 1 to 4).

[0015]

A lower vehicle structure of the present embodiment includes a fuel tank 10 mounted under a floor panel 33, and a rear drive shaft 37 disposed under the floor panel 33, and extending in the longitudinal direction of the vehicle. On the fuel tank 10, a cartridge 20 is mounted. These elements will be described below.

-4 [0016]

As illustrated in FIG. 1, the fuel tank 10 is disposed between the lateral elements 31. The lateral elements 31 are arranged in the two respective lateral parts in the direction of the width of the vehicle in a lower part of the vehicle and are elements extending in the longitudinal direction of the vehicle, and are also elements having a high rigidity and constituting a vehicle body chassis. The floor panel 33 composing the vehicle body floor is mounted on the upper parts of the lateral elements 31.

[0017]

As illustrated in FIGS. 2 and 3, the fuel tank 10 is a resin container extending across the width of the vehicle, and is provided with a recess 13 over the entire surface across the width of the vehicle. vehicle outside across the width of the vehicle into a bottom surface. That is, the bottom surface of the fuel tank 10 has a recess 13, and a projection 15 adjacent to this recess. The recess 13 in the fuel tank 10 is a shallow bottom part and the projection 15 is a deep bottom part.

[0018]

In the recess 13, the entire area in the longitudinal direction of the vehicle outside in the direction of the width of the vehicle in the bottom surface is embedded relative to the upper side of the vehicle. In the recess 13 illustrated in Figure 1, a right side portion in the bottom surface of the fuel tank 10 is recessed. That is, the bottom surface of the fuel tank 10 has a bearing composed of two bottom surfaces, and more specifically has an upper bottom surface 13a which is a part where the recess 13 is located, and a surface lower bottom 15a which is a part where the projection 15 adjacent to the recess 13 is located. On the bottom surface

-5 upper 13a of the recess 13, the cartridge 20 is mounted. The mounting of the cartridge 20 and the like will be described below.

[0019]

The fuel tank 10 has a supply hole (not shown) for introducing liquid fuel into the fuel tank 10, in a side surface extending from the outside in the vehicle width direction from the upper bottom surface 13a to the upper side of the vehicle, and is further provided with a recovery part (not shown) for recovering the vapor coming from a liquid fuel, on an upper surface of the fuel tank 10.

[0020]

A fill hose (not shown) is mounted in the feed hole. The liquid fuel is supplied to the fuel tank 10 through the hose for filling. The recovery part is connected to the cartridge 20 by a recovery conduit (not shown). The vapor generated by the perspiration of the liquid fuel in the fuel tank 10 is sent to the cartridge 20 through the recovery conduit. [0021]

As illustrated in Figures 1 and 2, the rear drive shaft 37 is an element extending in the longitudinal direction of the vehicle, and is disposed between the front wheels 51 and between the rear wheels 41 of the vehicle. The rear drive shaft 37 rotates, so that the power of a motor (not shown) arranged in the front part of the vehicle is transmitted to the rear wheels 4L [0022]

As illustrated in FIG. 3, the rear drive shaft 37 is arranged so as to overlap on the fuel tank 10 in top view, a front end 37a of the rear drive shaft 37 is connected to a transfer 32 arranged on the front side of

-6 fuel tank vehicle 10, a rear end 37b of the rear drive shaft 37 is connected to a rear differential support 35 arranged on the rear side of the fuel tank vehicle 10. The rear differential support 35 is connected to an axle housing (rear axle) 39 of the rear wheels 41, and the like.

[0023]

A rear part in the longitudinal direction of the vehicle of the rear drive shaft 37 is arranged so as to overlap on the upper bottom surface 13a of the recess 13 in top view. The upper bottom surface 13a overlapping on this rear part in the longitudinal direction of the vehicle from the rear drive shaft 37 in top view, and a peripheral part 13b thereof are further back from the upper side .

[0024]

The rear drive shaft 37 is disposed in one of the regions with the center in the vehicle width direction of the vehicle body (the center in the vehicle width direction of the floor panel 33 in this example) as a limit. That is, the rear drive shaft 37 is disposed in a position offset from one side in the direction of the vehicle width relative to the center in the direction of the vehicle width of the vehicle body. In this example, the rear drive shaft 37 is disposed in a region where the cartridge 20 is disposed, relative to the center in the direction of the vehicle width. For example, in the present embodiment, the rear drive shaft 37 is disposed to the right of the center in the direction of the vehicle width of the vehicle body. Therefore, a region having a large distance between the rear driveshaft 37 and a vehicle widthwise end of the vehicle body, and a region having a small distance between the rear driveshaft 37 and a end in the vehicle width direction of the vehicle body are defined.

-7 [0025]

The entire area of the bottom undersurface 15a is disposed in the above region having the longest distance between the rear driveshaft 37 and the vehicle widthwise end of the vehicle body. In the region with the short distance, part of the upper bottom surface 13a is disposed. In the present example, the center in the vehicle width direction of the vehicle body may overlap on the lower bottom surface 15a which becomes the bottom of the fuel tank 10, when viewed from above. According to the present configuration, the projection 15 (bottom end part) which does not interfere with the rear drive shaft 37 can be arranged in the above region having the great distance, and therefore it is possible to increase the fuel tank capacity 10.

[0026]

The transfer 32 connected to the front end 37a of the rear transmission shaft 37 has a function of distributing the engine power, transmitted by a transmission (not shown) in a transmission casing 52, between the front wheels 51 and the rear wheels 4L The transfer 32 is fixed to the side members 31 on both sides across the width of the vehicle, and the like via the supports 32a, 32b, and the like. [0027]

The transmission housing 52 and the transfer 32 are connected by a first front transmission shaft 53 extending in the longitudinal direction of the vehicle. A second front drive shaft 54 is connected to a front part of the transfer 32, and a front differential support 55 is connected to a front part of the second front drive shaft 54. [0028]

The rear differential support 35 and the front differential support 55 are each an element forming part of a device intended to absorb a difference in rotation.

Between the left and right drive wheels generated due to the difference between a distance of movement of each wheel outside a corner and a distance of movement of each wheel inside the corner at the time of the turning of the vehicle, and to make a smooth turn. [0029]

Next, a shape and the like of the cartridge 20 will be described. As illustrated in Figures 1 to 3, the cartridge 20 has a substantially rectangular parallelepiped shape, and extends so as to tilt slightly relative to the longitudinal direction of the vehicle. Although the illustration is omitted, a plurality of mounting flanges (not shown) are provided on an upper surface of the cartridge 20, and the mounting flanges are mounted on the upper bottom surface 13a of the recess 13 through , for example, a support (not shown) and the like.

[0030]

The cartridge 20 and the rear transmission shaft 37 are arranged so as to overlap at least partially in side view, and are adjacent in top view. In addition, the rear drive shaft 37 is disposed between the cartridge 20 and the bottom undersurface 15a in the vehicle width direction. The cartridge 20 is arranged to tilt in a direction in which it is further from the rear drive shaft 37 on its rear side of the vehicle in the longitudinal direction.

[0031]

An angle formed by the direction going from the front end 37a of the rear drive shaft 37 towards the rear end 37b (longitudinal direction of the vehicle), and the direction going from a front end 21 of the cartridge 20 to a rear end (inclined direction with respect to the rear drive shaft 37) (inclination angle a) is preferably an acute angle such as an angle of about 10 degrees to 30 degrees.

[0032]

For example, as illustrated in FIG. 4, the angle of inclination a is preferably adjusted to an angle (acute angle) greater than an angle composed of a ratio between an amount of displacement of the rear differential support 35 in the vehicle width direction (amount of travel XI in the width direction) at the time of the lateral collision described below and a distance L1 from the front end 37a of the rear drive shaft 37 to the rear end 37b, that is to say, the distance L1 from a position of connection of the rear transmission shaft 37 to the transfer 32 to a position of connection of the rear transmission shaft 37 to the support rear differential 35. FIG. 4 illustrates the rear drive shaft 37A which rotates with the front end 37a as the center after the side collision on the rear drive shaft 37 before the side collision.

[0033]

For example, the acute angle is more preferably greater than that which satisfies the relationship of Expression (1).

tan a = Xl / Ll ... (Expression 1)

However, a maximum value of a should be around 30 degrees as described above, due to the relationship with the other constituent members.

[0034]

At this time, a distance X3 in the width direction of the vehicle between one end 22 on a side close to the rear propeller shaft 37 of the cartridge 20, and the rear propeller shaft 37 is preferably greater than an amount of displacement X2 in the width direction at a position equivalent to the front end 21 of the cartridge 20.

[0035]

For example, X3 more preferably satisfies the relationship of the following Expression (2).

X3> X2 = (L2 / L1) -X1 ... (Expression 2)

- 10 [0036]

For example, when a lateral collision, in which a lateral collision load acts on a lateral part of the vehicle body remote from the cartridge 20, occurs, a load directed inward in the direction of the vehicle width acts on one of the rear wheels 41. Under the action of this load, the rear wheel 41 moves inward in the width of the vehicle direction. That is, the rear wheel 41 on the side collided side moves toward one end in the vehicle width direction on the side opposite to one end in the vehicle width direction on the side subjected to the side collision, in the vehicle width direction (direction of the side collision).

[0037]

At this time, the axle housing (rear axle) 39 and the like moves in the direction of the side collision which is the same as the rear wheel 41. Thus, the rear differential carrier 35 also moves in the direction of the lateral collision. In the case where the connection between the front end 37a of the rear drive shaft 37 and the rear differential support 35 is maintained, when the rear differential support 35 moves in the direction of the lateral collision, the end rear 37b of the rear drive shaft 37 also moves in the direction of the lateral collision.

[0038]

On the other hand, the transfer 32 is fixed to the lateral elements 31 by the supports 32a, 32b, and the like, and therefore, it is therefore unlikely that a significant change in position will occur at the time of the lateral collision. As a result, the rear drive shaft 37 rotates outward in the vehicle width direction with the front end 37a connected to the transfer 32 as a center, and moves so as to tilt relative to in the longitudinal direction of the vehicle.

[0039]

- 11 Thus, the angle of inclination a and the distance X3 in the direction of the vehicle width are adjusted, so that, for example, even when the rear drive shaft 37 moves so as to tilt at the time of the lateral collision, the rear drive shaft 37 can avoid contact with the cartridge 20. As a result, it is also possible to reduce the damage caused to a fastener of the cartridge 20 and to the surface of lower top 13a, as well as reducing the risk of damage to the body of the cartridge 20. [0040]

The front end 21 of the cartridge 20 is disposed on the front face of the vehicle with respect to a front end 10a of the fuel tank 10, and is disposed on the rear face of the vehicle with respect to the transfer 32. With such an arrangement, the cartridge 20 is arranged on the side of the front part where the amount of movement is small at the time of the lateral collision. Therefore, even when the rear end 37b of the rear drive shaft 37 moves to the opposite side (side where the cartridge 20 is disposed), it is unlikely that the rear drive shaft 37 will come into contact with cartridge 20. [0041]

The description of the present embodiment is given by way of example to describe the present invention, and does not limit the scope of the invention. Furthermore, the configuration of each part of the present invention is not limited to the above-mentioned embodiment, and various changes can be made in the technical scope of the present invention. [List of Reference Numbers] [0042] fuel tank

10a front end of course

13a upper bottom surface

- 1215 projection

15a bottom surface lower cartridge front end transfer side element

32a support

32b floor panel support rear differential support rear drive shaft

37a front end

37b rear end axle housing (rear axle) rear wheels front wheels transmission housing first transmission shaft before second transmission shaft before front differential carrier

Claims (4)

claims 1. Lower structure of vehicle comprising a fuel tank (10) disposed under a floor panel (33), and extending in the direction of a vehicle width, and a drive shaft (37) disposed under the panel floor (33), and extending in a longitudinal direction of the vehicle, in which a recess (13) recessed with respect to an upper side of the vehicle is formed in a lateral part in the direction of the width of the vehicle in a surface bottom (15) of the fuel tank (10), and a cartridge (20) is arranged in the recess (13), the bottom surface (15) comprises an upper bottom surface (13a) located in the recess (13), and a lower bottom surface (15a) arranged on a lower side of the vehicle with respect to the upper bottom surface (13a), and the drive shaft (37) is arranged so as to overlap the surface of upper bottom (13a) for top view s, a front part of the transmission shaft (37) is connected to a transfer (32), and a rear part of the transmission shaft (37) is connected to a rear axle, in which the cartridge (20) and the drive shaft (37) are arranged to overlap at least partially in side view, the drive shaft (37) is disposed between the cartridge (20) and the lower bottom surface (15a) in the width of the vehicle, and the cartridge (20) is arranged to tilt in a direction in which it is further from the drive shaft (37) at a rear of the vehicle. 2. A lower vehicle structure according to claim 1, wherein a front end of the cartridge (20) is disposed at a front of the vehicle relative to a front end of the fuel tank (10). 3. lower vehicle structure according to claim 1 or claim 2, wherein the drive shaft (37) is arranged so as to be offset from one side relative to a center in the direction of the vehicle width of a vehicle body, a region having a large distance between the drive shaft (37) and a 5 vehicle widthwise end of the vehicle body, and a region having a small distance between the drive shaft (37) and a vehicle widthwise end of the vehicle body are defined, and the bottom undersurface (15a) is disposed in the region having the longest distance.