JP2526751Y2 - Lower body structure of vehicle - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a lower body structure of a vehicle such as a van type vehicle in which a front frame is disposed at a position below a front floor and at a position corresponding to a bumper. .

(Prior Art) Conventionally, as a lower body structure of the van-type vehicle of the above example,
For example, there is a structure described in Japanese Utility Model Application Laid-Open No. 63-162682.

That is, the front floor on which the driver's seat and the passenger seat are mounted and the rear floor forming the lower surface of the cargo compartment are arranged substantially flush with each other, and the upper part of the driver's seat and the passenger seat is positioned between the driver's seat and the passenger seat. A lower body structure of a van-type vehicle having a structure in which an engine deck projecting from the front floor is formed, and a front frame extending in the vehicle front-rear direction at a position below the front floor and at a position corresponding to the bumper is provided.

In the conventional structure having the above configuration, the luggage space is expanded,
In order to secure a working space in the cargo room and to make the rear floor stepless, a low-floor rear floor may be connected to the rear end of the front floor via a step-down portion. There is a problem that the separation distance between them becomes large, and the supporting rigidity between them becomes insufficient.

That is, the front frame described above cannot be offset upward with respect to the bumper because the front frame receives an input load from the bumper at the time of a frontal collision, and the engine and the transmission are arranged below the front floor. Because the front floor cannot be lowered to a lower position close to the front frame, the separation distance between the front floor and the front frame inevitably increases, and the supporting rigidity between the two is insufficient. Becomes

(Object of the Invention) An object of the invention is to provide a lower vehicle body structure of a vehicle that can achieve both lowering of a rear floor and improvement of support rigidity between a front floor and a front frame.

(Structure of the invention) This invention is characterized in that the upper frame joined to the lower surface of the front floor extends in the front-rear direction of the vehicle body at a position separated downward from the front floor, and the first frame is closed by the front frame inner and the front frame outer. A front frame having a cross section, the front frame outer of the front frame extending upward to the lower surface of the front floor, and the extended portion serving as an inner member of the upper frame. It is a lower vehicle body structure of a vehicle in which a second closed cross section is formed by a frame.

(Effects of the Invention) According to the invention, when the rear floor is lowered, the distance between the front floor and the front frame becomes large, but the upper frame, the front frame outer, and the front Since the so-called double closed cross-section structure in which the first and second closed cross-sections are formed by the three parts with the frame inner is achieved,
There is an effect that the support rigidity between the front floor and the front frame can be improved.

(Embodiment) An embodiment of the present invention will be described in detail below with reference to the drawings.

The drawings show the body structure of an FF (front engine front wheel drive) type van-type vehicle. In FIGS. 1 and 2, an engine 2 is arranged behind a radiator 1 arranged at the front of the body. A transmission 3 is connected to the rear end of the engine 2, and the output of the transmission 3 is transmitted to the left and right front wheels 4, 4 via a front differential (not shown), thereby driving the front wheels 4, 4. doing.

On the other hand, front frames 5, 5 and rear side frames 6, 6 extending in the front-rear direction are provided at the lower part of the vehicle body, and these frames 5, 6 are integrally formed in the front-rear direction,
Cross members 7, 8, 9, 10, 1 between left and right frames 5, 5 and 6, 6
They are linked to each other by 1.

The front floor 14 on which the driver's seat 12 and the passenger seat 13 are mounted and the rear floor 16 on which the rear seat 15 is mounted are connected to the stepped portion 18 of the center pillar 17 mounting portion.
A so-called step-down portion is formed in the front-rear direction, and a steering wheel 19 for steering the front wheels is provided in front of the driver's seat 12 described above.

Further, the left and right rear wheels 20, 20 are suspended by leaf spring type rear suspensions 21, 21.

On the other hand, torque boxes 22, 22 extending outward in the vehicle width direction are joined to substantially middle portions of the above-described front frames 5, 5 in the front-rear direction, and wheels are provided from both ends of these left and right torque boxes 22, 22 toward the front of the vehicle body. Apron frames 23, 23 are arranged along the apron 32 (see FIG. 3).

Hinge pillars 24, 24 extending vertically are joined to predetermined portions of the left and right apron frames 23, 23, and front pillars 25, 25 are joined to upper ends of the hinge pillars 24, 24.

By the way, the lower body structure of the vehicle around the front floor 14 and the front frame 5 described above is configured as shown in FIGS.

That is, the above-described front frame 5 is disposed below the front floor 14 and at a position corresponding to the bumper toward the front-rear direction of the vehicle body, and the front frame 5 includes a front frame outer 26 and a front frame inner 27. Form a first closed section 28.

On the other hand, an upper frame 29 having a substantially L-shaped cross section is provided which is joined to the lower surface of the front floor 14 described above.

Then, the front frame outer 26 of the front frame 5 is extended upward to the lower surface of the front floor 14 to form an extension 30, and the extension 30 is formed as an inner member of the upper frame 29. , The extension 30
A second closed section 31 (see FIG. 5) is formed by the upper frame 29 and the upper frame 29 described above.

Here, the above-described front frame inner 27 has joining flange portions 27b and 27c above and below a main portion 27a having a substantially U-shaped cross section, and these two flange portions 27b and 27c are connected to the main surface portion 26a of the above-described front frame outer 26. And a first closed section 28 is formed by spot welding.

Joint flanges 27d and 27e for joining the inner frame 27 to the rear floor 16 are integrally formed at the upper rear end of the above-described front frame inner frame 27.

At the upper end of the extension portion 30 of the front frame outer 26 described above, a first joint flange portion 30a is integrally formed by bending, and the first joint flange portion 30a is joined to the lower surface of the front floor 14.

At the front of the above-described first joining flange portion 30a forming portion,
A second joint flange portion 33 having a substantially L-shaped cross section for joining the front frame outer 26 to the wheel apron 32 is integrally formed by bending.

Further, the above-mentioned upper frame 29 is formed by integrally forming a horizontal surface portion 34, an upright surface portion 35 on the outer side in the vehicle width direction, and an upright surface portion 36 on the rear side in the vehicle front-rear direction in substantially right angles, respectively. 34 has a joining flange portion 34a for joining to the front frame outer 26, and a joining flange portion 35a for joining to the front floor 14 at the upper end of the above-described standing surface portion 35.
Joint flanges 36a and 36b for separately joining to the front floor 14 and the front frame outer 26 are integrally formed on the above-described standing surface portion 36, respectively. A joining piece 37 is integrally formed obliquely over the front end, and the joining piece 37 is joined and fixed to the wheel apron 32 described above.

Then, the above-described upper frame 29 is attached to the front floor 14.
As shown in FIG. 5, the second closed cross section is formed obliquely above the first closed cross section 28 between the first closed cross section 28 and the front frame outer 26.
31 are formed to form a so-called double closed cross section structure.

The legs 40 of the driver's seat 12 and the passenger seat 13 are attached to the upper part of the front floor 14 at the double closed section forming portion using a plurality of bolts 38 and nuts 39.

Incidentally, reference numeral 41 in FIG. 3 denotes a dash lower panel.

As shown in FIG. 1, when the rear floor 16 has a low-floor structure for the purpose of expanding the luggage space, securing a work space in the luggage room, and making the rear floor 16 stepless, the above-described front floor 14 And front frame 5
The distance between the upper frame and the upper frame
29, a front frame outer 26 and a front frame inner 27 form a so-called double closed cross-section structure in which first and second closed cross sections 28 and 31 are formed.
There is an effect that the support rigidity between the front floor 14 and the front frame 5 can be improved while the floor 16 is reduced.

In addition, as shown in the above-described embodiment, when the legs 40 of the seats 12, 13 are mounted on the front floor 14 corresponding to the double-closed section forming portion, a relatively large load is applied to the front floor 14. There is an effect that the added sheet mounting portion can be strengthened.

[Brief description of the drawings]

1 is a side view showing a lower body structure of a van-type vehicle, FIG. 2 is a plan view of the same, FIG. 3 is a perspective view of a main part, and FIG. FIG. 5 is an exploded perspective view of a frame, a front frame outer, and a front frame inner. FIG. 5 is a cross-sectional view taken along line AA of FIG. 5 Front frame 14 Front floor 26 Front frame outer 27 Front frame inner 28 First closed section 29 Upper frame 30 Extended section 31 Second closed section

Claims (1)

(57) [Scope of request for utility model registration] A first closed section is formed by an upper frame joined to a lower surface of a front floor, and extends in the front-rear direction of the vehicle body at a position separated downward from the front floor, and includes a front frame inner and a front frame outer. A front frame, wherein the front frame outer of the front frame is extended upward to the lower surface of the front floor, and the extended portion is formed as an inner member of the upper frame, and the extended portion and the upper frame are connected to each other. 2 Lower body structure of a vehicle with a closed cross section.