JPH09188277A - Floor frame structure supporting floor panel of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the deformation of a floor frame to the minimum when the power from the front is applied while a vehicle is running. SOLUTION: A first frame part 21 is provided so as to extend in the vehicle advancing direction along an undersurface of a front horizontal part 14c of a floor panel 14. A second frame part 22 provided in the rear end of the first frame part is provided so as to extend in the vehicle advancing direction along an undersurface of a leading edge part 14f, and a third frame part 23 provided in the rear end of the second frame part 22 is provided so as to extend in the vehicle advancing direction along an undersurface of a rear horizontal part 14g. One end of a first energy absorption member 31 constructed substantially straight between the first frame part and the second frame part is adhered to the inner surface of the first frame part, and the other end is adhered to the inner surface of the second frame part. The first energy absorption member is constituted so as to be crushed when the combined part of the first and second frame parts is deformed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor frame structure provided on a lower surface of a floor panel of a vehicle and supporting the floor panel.

[0002]

2. Description of the Related Art Conventionally, a pair of box-shaped side members provided on the lower surface of a floor so as to extend in the vehicle traveling direction have a front horizontal portion, a front inclined portion, an intermediate horizontal portion, a rear inclined portion, and a rear horizontal portion. And the front horizontal part and the rear horizontal part are formed to have a smaller cross-sectional shape than the intermediate horizontal part, and the front horizontal part and the rear horizontal part are vertically offset, and between the front horizontal part and the front inclined part. Disclosed is a reinforcing structure for a side member in a vehicle in which a front baffle is erected in the front first bent portion and a rear baffle is erected in the front second bent portion between the front inclined portion and the intermediate horizontal portion. (Actual development 62-9708
3). In this reinforcing structure, the front side baffle and the rear side baffle are erected so as to substantially close the box-shaped cross section of the side member, and the front side baffle and the rear side baffle are connected by a reinforcement laid horizontally. Also, flanges are formed on both sides of the front baffle, the rear baffle, and the reinforcement, and these flanges are welded to the inner surfaces of both side walls of the side member.

In the reinforcing structure of the side member thus constructed, even if a force received from the front is applied to the side member while the vehicle is traveling, the reinforcing member is composed of the front baffle, the rear baffle and the reinforcement. Thus, it is possible to prevent the front first bent portion and the front second bent portion from being broken. As a result, the force can be absorbed by buckling the front horizontal portion of the side member.

[0004]

However, in the above-mentioned conventional side member reinforcing structure, the front horizontal portion is generally curved in substantially the same horizontal plane due to the securing of the accommodating portion of the engine, etc.
Further, since the strength of the front first bent portion and the front second bent portion is increased by the reinforcing member, the front horizontal portion is broken by the force applied to the vehicle, and the front horizontal portion sufficiently absorbs the force. I couldn't do it. An object of the present invention is to provide a floor frame structure that supports a floor panel of a vehicle that can minimize the amount of deformation of the floor frame when a force from the front is applied while the vehicle is traveling.

[0005]

The invention according to claim 1 is
As shown in FIG. 1 and FIG. 4 or FIG. 7, a substantially horizontal front horizontal portion 14c, a rising portion 14f continuously provided at the rear end of the front horizontal portion 14c and rising obliquely upward and a rear end of the rising portion 14f. Substantially horizontal rear horizontal part 14g
A floor panel 14 having a front horizontal portion 14c
A first frame portion 2 that extends along the lower surface in the vehicle traveling direction and forms a closed cross section with the front horizontal portion 14c.
1, a second frame portion 22 that is provided continuously to the rear end of the first frame portion 21 and extends along the lower surface of the rising portion 14f in the vehicle traveling direction, and forms a closed cross section with the rising portion 14f; A third section which is continuously provided at the rear end of the section 22 and extends in the vehicle traveling direction along the lower surface of the rear horizontal section 14g and which forms a closed cross section together with the rear horizontal section 14g.
It is an improvement of a floor frame structure for supporting a floor panel of a vehicle including a frame portion 23. The characteristic configuration is that the first frame portion 21 and the second frame portion 22 are installed in a substantially straight line, one end is fixed to the inner surface of the first frame portion 21, and the other end is fixed to the inner surface of the second frame portion 22. The first energy absorbing member 31 or 71 is provided, and the first energy absorbing member 31 or 71 includes the first and second frame portions 2
It is configured to be crushed when the connecting portions of 1, 2 are deformed. In this floor frame structure, the vehicle 1
When a force is applied from the front while the vehicle is traveling at 0, the second frame 22 rising obliquely upward tends to be deformed in the direction further rising. However, due to the compressive force acting on the first energy absorbing member 31 or 71, this absorbing member 31 or 71 is crushed,
In the process of this crushing, the energy due to the force is efficiently absorbed.

In the invention according to claim 2, as shown in FIG. 5, the second frame portion 22 and the third frame portion 23 are installed in a substantially straight line, and one end is on the lower surface of the rising portion 14f in the second frame portion 22. The second energy absorbing member 52 is fixed and the other end is fixed to the lower surface of the rear horizontal portion 14g in the third frame portion 23, and the second energy absorbing member 52 connects the second and third frame portions 22, 23. It is a floor frame structure for supporting a floor panel of a vehicle, which is configured to be crushed when the installation portion is deformed. In this floor frame structure, when a force is applied from the front while the vehicle is traveling, the second frame 22 rising diagonally upward tends to be deformed in the direction further rising, but the second energy absorbing member 5
The absorbing member 52 is crushed by the compressive force acting on 2, and the energy due to the force is efficiently absorbed in the process of crushing.

In the invention according to claim 3, as shown in FIG. 6, the first frame portion 21 and the second frame portion 22 are installed in a substantially straight line, and one end is fixed to the inner surface of the first frame portion 21 and the other. The first energy absorbing member 31 whose end is fixed to the inner surface of the second frame portion 22, the second frame portion 22, and the third energy absorbing member 31.
The second energy, which is installed in a substantially straight line with the frame portion 23, has one end fixed to the lower surface of the rising portion 14f in the second frame portion 22 and the other end fixed to the lower surface of the rear horizontal portion 14g in the third frame portion 23. The first and second energy absorbing members 31, 52 are provided with an absorbing member 52, and the first and second energy absorbing members 31, 52 are connected to the first and second frame portions 21, 22 and the second and third frame portions 2.
It is a floor frame structure for supporting a floor panel of a vehicle, characterized in that it is configured to be crushed when the connecting portions of 2, 23 are deformed. In this floor frame structure, when a force is applied from the front while the vehicle is traveling, the second frame 22 rising diagonally upward tends to be deformed in the direction further rising, but the first and second energy absorbing members 3
These absorbing members 3 due to the compressive force acting on 1, 52
1, 52 are crushed, and the energy due to the force is efficiently absorbed in the process of crushing.

[0008]

Next, a first embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 4, the chassis frame 11 of the cab-over type truck 10 is shown.
A cab 13 is mounted on the front portion of the cab via a cab suspension device 12. On the lower surface of the floor panel 14 of the cab 13, a floor frame 16 that supports this panel 14 is provided.
Is arranged. The floor panel 14 is formed by bending a metal plate such as a steel plate, and has a front bulging portion 14b formed by projecting upward in the center of the front portion and a front horizontal portion 14c formed substantially horizontally on the left and right portions of the front portion. , 14c, and a front bulge portion 14
An intermediate panel portion 14 having an intermediate bulge portion 14e continuously provided at the rear end of b and rising portions 14f and 14f continuously provided at the rear ends of the front horizontal portions 14c and 14c.
d and a substantially horizontal rear horizontal portion 14g continuously provided at the rear end of the intermediate panel portion 14d. An engine (not shown) mounted between the pair of side members 11a of the chassis frame 11 is housed on the lower surfaces of the front bulging portion 14b and the intermediate bulging portion 14e.

The floor frame 16 includes a pair of floor side members 17 and 17 extending in the vehicle traveling direction, and a floor cross member 18 (FIG. 3) installed on the side members 17 and 17. The floor side member 17 is formed by bending a cross-section inverted hat-shaped shaped steel or the like having a pair of flanges 17a, 17a (FIG. 2) along the lower surface of the floor panel 14 into a substantially crank shape, and First frame portions 21 and 21 arranged along the lower surfaces of the horizontal portions 14c and 14c, and the first frame portion 2
The rising portions 14f, which are continuously provided at the rear ends of
Second frame portions 22, 2 arranged along the lower surface of 14f
2 and the third frame portions 23, 23 that are continuously provided at the rear ends of the second frame portions 22, 22 and are provided along the lower surface of the rear horizontal portion 14g (FIGS. 1 to 4). Further, by welding the pair of flanges 17a, 17a of the floor side member 17 to the lower surface of the floor panel 14, the first frame portion 21 and the front horizontal portion 14c, the second frame portion 22, the rising portion 14f, and the third frame portion 23. And the rear horizontal portion 14g constitutes a closed cross section. Although a truck is used as the vehicle in this embodiment,
The vehicle may be a one-box type vehicle or another vehicle as long as the vehicle is provided along the lower surface of the floor panel and has a frame bent in a crank shape.

The characteristic structure of the present embodiment is that one end of a first energy absorbing member 31 which is installed in a substantially straight line between the first frame portion 21 and the second frame portion 22 is fixed to the inner surface of the first frame portion 21. And the other end is the second frame portion 22.
(Figs. 1 and 2). The first energy absorbing member 31 is a cylindrical absorbing member body 31a.
And a pair of brackets 31b and 31c welded to both ends of the absorbent member main body 31a. Absorbing member body 3
1a is formed of a metal pipe such as a steel pipe, and a plurality of beads 31d that swell in the radial direction and extend in the circumferential direction are formed on the outer peripheral surface thereof at predetermined intervals in the axial direction of the absorbent member main body 31a. One of the pair of brackets 31b and 31c is welded to the inner surface of the first frame portion 21, and the other bracket 31c is attached to the second frame portion 2.
2 is welded to the inner surface.

The cab suspension device 12 is a cab 1.
3 A front suspension part 26 for suspending the front part and a rear suspension part 27 for suspending the rear part of the cab 13 are provided (FIG. 4). The front suspension portion 26 includes a lower bracket 26a fixed to the front end of the side member 11a of the chassis frame 11, a link lever 26c whose front end is pivotally attached to the upper end of the bracket 26a via a lower pin 26b, and an upper surface of the first frame. A substantially T-shaped upper bracket 26d fixed to the lower surface of the portion 21 and having its lower end pivotally attached to the approximate center of the link lever 26c, and the link lever 26c.
It has a first air spring 26e interposed between c and the upper bracket 26d, and a shock absorber 26f whose lower end is rotatably attached to the lower pin 26b and whose upper end is pivotally attached to the upper bracket 26d. Further, the rear suspension portion 27 includes a rear arch 27a that is provided between the pair of side members 11a of the chassis frame 11 and a floating arch 27b that is provided above the rear arch 27a and that is provided above the pair of third frame portions 23, 23.
And a second air spring 27c interposed between the arches 27a and 27b. The cab 13 is tiltable around the lower pin 26b.

In the floor frame structure constructed as described above, when a force is applied from the front while the truck 10 is running, the second frame 22 rising diagonally upward tends to be deformed in the direction further rising. At this time, since a compressive force acts on the absorbing member main body 31a of the first energy absorbing member 31, the absorbing member main body 31a is crushed starting from the plurality of beads 31d, and the pair of brackets 31b and 31c approach each other. The energy due to the force is efficiently absorbed in the process of crushing the absorbing member body 31a. As a result, the amount of deformation of the second frame portion 22, that is, the amount of deformation of the floor frame 16 can be minimized.

FIG. 5 shows a second embodiment of the present invention.
5, the same reference numerals as those in FIG. 1 indicate the same parts. In this floor frame structure, the second energy absorbing member 52 is installed on the second frame portion 22 and the third frame portion 23 in a substantially straight line. The energy absorbing member 52 is configured substantially the same as the first energy absorbing member of the first embodiment, and has an absorbing member main body 52a and a pair of brackets 52b and 52c. One of the pair of brackets 52b, 52c is welded to the lower surface of the rising portion 14f in the second frame portion 22, and the other bracket 52c is welded to the lower surface of the rear horizontal portion 14g in the third frame portion 23. In the floor frame structure configured in this manner, when a force is applied from the front while the truck is traveling, the second frame 22 rising diagonally upward tends to be deformed in the direction further rising. At this time, the second energy absorbing member 52 acts in the same manner as the first energy absorbing member of the first embodiment. As a result, the amount of deformation of the second frame portion 22, that is, the amount of deformation of the floor frame 16 can be minimized.

FIG. 6 shows a third embodiment of the present invention.
6, the same reference numerals as those in FIGS. 1 and 5 indicate the same parts. In this floor frame structure, the first frame portion 21
The first energy absorbing member 31 is installed on the second frame portion 22 in a substantially straight line, and the second energy absorbing member 52 is installed on the second frame portion 22 and the third frame part 23 in a substantially straight line. The first energy absorbing member 31 has an absorbing member main body 31a and a pair of brackets 31b and 31c, and the second energy absorbing member 52 has an absorbing member main body 52a and a pair of brackets 52b and 52c. One bracket 31b of the pair of brackets 31b and 31c is welded to the inner surface of the first frame portion 21, and the other bracket 31b.
c is welded to the inner surface of the second frame portion 22. In addition, one of the pair of brackets 52b and 52c, the one bracket 5
2b is welded to the lower surface of the rising part 14f in the second frame part 22, and the other bracket 52c is the third frame part 2
3 is welded to the lower surface of the rear horizontal portion 14g.

In the floor frame structure thus constructed, when a force is applied from the front while the truck is traveling, the second frame 22 rising diagonally upward tends to be deformed in the direction further rising. At this time, the first and second energy absorbing members 31 and 52 act similarly to the first energy absorbing member of the first embodiment and the second energy absorbing member of the second embodiment, respectively. As a result, the amount of deformation of the second frame portion 22, that is, the amount of deformation of the floor frame 16 can be minimized.

7 and 8 show a fourth embodiment of the present invention. 7 and 8, the same reference numerals as those in FIGS. 1 and 2 indicate the same parts. In this floor frame structure,
A first energy absorbing member 71 is installed on the frame portion 21 and the second frame portion 22 in a substantially straight line. The energy absorbing member 71 is formed by bending a metal plate such as a steel plate into a hat-shaped cross section, and has a pair of flanges 71a, 71a.
Is provided. The flange 71a is formed along the middle flange portions 71b, 71b at the center in the longitudinal direction, the front side flange portion 71c formed along the inner surface of the first frame portion 21, and the inner side surface of the second frame portion 22. It has a side flange portion 71d. A plurality of beads 71e, which bulge outward and extend in a direction orthogonal to the longitudinal direction, are formed on the outer peripheral surface of the energy absorbing member 71 at predetermined intervals in the longitudinal direction. The front flange portion 71c is welded to the inner surface of the first frame portion 21, and the rear flange portion 71d is welded to the inner surface of the second frame portion 22. In the floor frame structure configured as described above, the operation when a force is applied from the front while the truck is traveling is substantially the same as that in the first embodiment, and thus the repeated description is omitted.

[0017]

As described above, according to the present invention, the first frame portion extending along the lower surface of the front horizontal portion of the floor panel and the first frame portion extending continuously from the rear end of the first frame portion and extending along the lower surface of the rising portion. Since the first energy absorbing member is installed in a substantially straight line inside the two frame portions, and one end and the other end of this first energy absorbing member are fixed to the inner surface of the first frame portion and the inner surface of the second frame portion, respectively. When a force acts on the vehicle from the front to deform the connecting portions of the first and second frames, the absorbing member is crushed by the compressive force acting on the first energy absorbing member. Energy due to the force is efficiently absorbed. As a result, the amount of deformation of the second frame portion, that is, the amount of deformation of the floor frame can be minimized. In addition, a second energy absorbing member is installed in a substantially straight line on the second frame portion and the third frame portion, and one end and the other end of this second energy absorbing member are formed on the lower surface of the rising portion in the second frame portion and in the third frame portion. If the second energy absorbing member is fixed to the lower surface of the rear horizontal portion, the second energy absorbing member is crushed in the same manner as the first energy absorbing member, so that the same effect as described above can be obtained.

Further, one end and the other end of the first energy absorbing member, which is installed in a substantially straight line between the first frame portion and the second frame portion, are fixed to the inner surface of the first frame portion and the inner surface of the second frame portion, respectively. , One end and the other end of the second energy absorbing member which is installed in a substantially straight line between the second frame portion and the third frame portion are fixed to the lower surface of the rising portion in the second frame portion and the lower surface of the rear horizontal portion in the third frame portion. By doing so, the first and second energy absorbing members are crushed together when the connecting portion of the first and second frame portions and the connecting portion of the second and third frame portions are deformed. Is effective when one cannot absorb enough energy,
Further, when even one energy absorbing member can absorb energy sufficiently, there is an advantage that each energy absorbing member can be downsized.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a portion A of FIG. 4 showing a floor frame structure for supporting a floor panel according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is an exploded perspective view of the floor panel and floor frame.

FIG. 4 is a cross-sectional configuration diagram of a cab including the floor frame.

FIG. 5 is a sectional view showing a second embodiment of the present invention and corresponding to FIG. 1;

FIG. 6 is a sectional view corresponding to FIG. 1 showing a third embodiment of the present invention.

FIG. 7 is a sectional view corresponding to FIG. 1 showing a fourth embodiment of the present invention.

FIG. 8 is a sectional view taken along line CC of FIG. 7;

[Explanation of symbols]

 10 truck (vehicle) 14 floor panel 14c front horizontal part 14f rising part 14g rear horizontal part 16 floor frame 21 first frame part 22 second frame part 23 third frame part 31,71 first energy absorbing member 52 second energy absorbing part Element

Claims (3)

[Claims] 1. A substantially horizontal front horizontal part (14c), a rising part (14f) continuously connected to the rear end of this front horizontal part (14c) and rising obliquely upward, and a rear end of this rising part (14f). A floor panel (14) having a substantially horizontal rear horizontal portion (14g) continuously provided, and a front horizontal portion (14c) provided along the lower surface of the front horizontal portion (14c) extending in the vehicle traveling direction. A first frame portion (21) forming a closed cross section and the rising portion (14) connected to the rear end of the first frame portion (21).
f) A second frame portion (22) extending along the lower surface in the vehicle traveling direction and forming a closed cross section together with the rising portion (14f), and continuously provided at the rear end of the second frame portion (22). A floor panel of a vehicle, comprising a third frame portion (23) which is provided along the lower surface of the rear horizontal portion (14g) and extends in the vehicle traveling direction and which forms a closed cross section with the rear horizontal portion (14g). In a supporting floor frame structure, the first frame part (21) and the second frame part (22) are installed substantially linearly, one end of which is fixed to the inner surface of the first frame part (21) and the other end of which is fixed. Includes a first energy absorbing member (31, 71) fixed to an inner surface of the second frame portion (22), and the first energy absorbing member (31, 71) is the first and second energy absorbing members (31, 71).
A floor frame structure for supporting a floor panel of a vehicle, which is configured to be crushed when a connecting portion of the frame portions (21, 22) is deformed. 2. A substantially horizontal front horizontal part (14c), a rising part (14f) continuously connected to the rear end of this front horizontal part (14c) and rising obliquely upward, and a rear end of this rising part (14f). A floor panel (14) having a substantially horizontal rear horizontal portion (14g) continuously provided, and a front horizontal portion (14c) provided along the lower surface of the front horizontal portion (14c) extending in the vehicle traveling direction. A first frame portion (21) forming a closed cross section and the rising portion (14) connected to the rear end of the first frame portion (21).
f) A second frame portion (22) extending along the lower surface in the vehicle traveling direction and forming a closed cross section together with the rising portion (14f), and continuously provided at the rear end of the second frame portion (22). A floor panel of a vehicle, comprising a third frame portion (23) which is provided along the lower surface of the rear horizontal portion (14g) and extends in the vehicle traveling direction and which forms a closed cross section with the rear horizontal portion (14g). In the supporting floor frame structure, the second frame portion (22) and the third frame portion (23) are installed substantially linearly and one end thereof is the rising portion (14f) in the second frame portion (22). A second energy absorbing member (52) fixed to the lower surface and having the other end fixed to the lower surface of the rear horizontal portion (14g) in the third frame portion (23), the second energy absorbing member (52) Is configured to be crushed when the connecting portion of the second and third frame portions (22, 23) is deformed. Floor frame structure for supporting a floor panel of a vehicle, characterized. 3. A substantially horizontal front horizontal portion (14c), a rising portion (14f) continuously connected to the rear end of the front horizontal portion (14c) and rising obliquely upward, and a rear end of the rising portion (14f). A floor panel (14) having a substantially horizontal rear horizontal portion (14g) continuously provided, and a front horizontal portion (14c) provided along the lower surface of the front horizontal portion (14c) extending in the vehicle traveling direction. A first frame portion (21) forming a closed cross section and the rising portion (14) connected to the rear end of the first frame portion (21).
f) A second frame portion (22) extending along the lower surface in the vehicle traveling direction and forming a closed cross section together with the rising portion (14f), and continuously provided at the rear end of the second frame portion (22). A floor panel of a vehicle, comprising a third frame portion (23) which is provided along the lower surface of the rear horizontal portion (14g) and extends in the vehicle traveling direction and which forms a closed cross section with the rear horizontal portion (14g). In a supporting floor frame structure, the first frame part (21) and the second frame part (22) are installed substantially linearly, one end of which is fixed to the inner surface of the first frame part (21) and the other end of which is fixed. Is erected in a substantially straight line between the first energy absorbing member (31) fixed to the inner surface of the second frame portion (22) and the second frame portion (22) and the third frame portion (23). One end is fixed to the lower surface of the rising portion (14f) in the second frame portion (22) and the other end is the third flap. Over arm portion (23) wherein a rear horizontal section (14 g) second energy absorbing member fixed to the lower surface (52) in said first and second energy absorbing member (31, 52) is the first
And the second frame portion (21, 22) connecting portion and the second and third frame portion (22, 23) connecting portion are deformed when deformed respectively. Floor frame structure that supports the floor panel of the.