JP2000108950A - Floor part frame structure of vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide floor part frame structure that can efficiently transmit, disperse and damp impact energy from the front side and cope with the divided structure of a floor part in a vehicle body with floor part structure composed of a plurality of divided structure bodies. SOLUTION: In a vehicle body with a floor part composed of three parts that are a front frame 12, a passenger compartment part floor structure body 24 and a rear part floor structure body behind a passenger compartment, first underfloor frames 16-1, 16-2 with the front side ends horizontally opposed to the passenger compartment side end of the front frame 12 are fastened to the lower face of the passenger compartment part floor structure body 24, and second underfloor frames 18-1, 18-2 installed in the state of covering the intermediate areas of the upper face parts of the first underfloor frames 16-1, 16-2 are provided between the first underfloor frames 16-1, 16-2 and a toeboard 14 so that the rear side ends are extended into a range including an overlap part between the toeboard 14 and the passenger compartment part floor structure body 24.

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 of a vehicle body, and more particularly, to provide a plurality of frame members on the lower surface of the floor in consideration of transmission of impact energy when a vehicle receives an impact from the front. The present invention relates to a floor frame structure of a vehicle body.

[0002]

2. Description of the Related Art In a structure for responding to a shock from the front of a vehicle, it is ideal if all the shock energy can be absorbed in the front part of the cabin, but it is actually difficult. . In recent years, it has been general to improve the frame structure at the front of the vehicle body as a structure for responding to an impact from the front of the vehicle body. That is, various proposals have been made to incorporate a soft and rigid structure in the front frame in front of the passenger compartment so as to absorb energy when an impact is applied.

If only the shock absorption at the front frame is taken into consideration and the cabin is constructed so as not to be deformed or destroyed, a large shock is applied to the occupant in the cabin when a shock is applied from the front. May be added.

Therefore, when excessive impact energy is applied, instead of being absorbed only by the front frame, the impact energy is transmitted from the floor in the rear passenger compartment to the floor in the rear of the vehicle body. There is the idea that the energy is absorbed and attenuated.

[0005] In order to achieve such a structure, it is necessary to adopt a structure in which energy can be favorably transmitted between the front frame and the floor structure behind the front frame. For example, a frame member is attached to the lower surface side of the floor, such as a car floor structure disclosed in Japanese Utility Model Application Laid-Open No. 61-138779, without partial destruction,
In addition, a structure has been proposed in which energy from the front is dispersed throughout the floor.

[0006]

However, the structure constituting the vehicle body is divided for each unit, and is usually constructed by assembling the units.
For example, the floor is divided into a front structure (including a front frame) centering on the engine chamber, a floor structure in the passenger compartment below the passenger compartment, and a rear floor structure behind the passenger compartment.

[0007] Therefore, in the case of the above-described conventional technique in which the frame is simply attached to the lower surface of the floor, the impact energy from the front can be efficiently reduced on the floor having the unit structure divided into a plurality of units as described above. However, the problem from the viewpoint of dispersing the data in a computer has not been solved.

Therefore, in a floor structure composed of a plurality of units, it is necessary for the frame structure provided on the lower surface thereof to have a structure in which efficient energy transmission and dispersion are considered. In addition, it is necessary to satisfy a divided assembling condition corresponding to a floor composed of a plurality of units.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to efficiently disperse and attenuate the impact from the front of a vehicle body having a floor structure composed of a plurality of divided structures. It is an object of the present invention to provide a floor frame structure that can be adapted to a floor divided structure.

[0010]

According to a first aspect of the present invention, there is provided a floor frame structure for a vehicle body having a floor structure including a front frame, a floor structure in a passenger compartment, and a rear floor structure in a rear portion of the passenger compartment. For the vehicle body, a first underfloor frame having a front side end horizontally opposed to the cabin side end of the front frame is fixed to the lower surface of the floor structure of the cabin, and the first underfloor frame, the toeboard and Is installed so as to cover the middle area of the upper surface of the underfloor frame, and the rear end extends at least to a range including the overlapping portion of the toeboard and the floor structure of the passenger compartment. Is provided with a second underfloor frame. And
The joining and fixing are performed at the overlapping portion of the floor structure of the passenger compartment, the floor joint of the toe board, and the second underfloor frame.

[0011] Since the front end of the first underfloor frame is horizontally opposed to the passenger compartment end of the front frame in this manner, it is possible to reliably receive the impact from the front frame. The first underfloor frame to which the impact was transmitted is sufficiently reinforced by the presence of the second underfloor frame, which is the second underfloor frame installed thereon and welded and fixed together with the toeboard and the first underfloor frame. And
Deformation at that portion is effectively prevented, and energy can be reliably transmitted to the rear floor member.
That is, it is possible to transmit energy rearward in a state where deformation and destruction are suppressed as much as possible by a transmission portion from the front frame, which is the front portion of the vehicle body, to the floor structure of the passenger compartment, which is the intermediate portion.

[0012] A second underfloor frame is present on the lower surface side of the overlap portion between the floor joint of the toeboard and the floor structure of the passenger compartment, and the floor structure of the passenger compartment and the floor structure of the toeboard are provided. By being welded and fixed to the floor joint and the second underfloor frame, the second underfloor frame effectively reinforces the connection between the toeboard and the floor structure of the passenger compartment.

According to a second aspect of the present invention, there is provided a floor frame structure for a vehicle body, comprising: a third underfloor frame having a front end overlapped with a rear end of the first underfloor frame from an upper surface thereof; The third underfloor frame is mounted on the upper surface and the front end thereof extends beyond the front end of the third underfloor frame.
It was inserted between the rear end of the underfloor frame and the floor structure of the passenger compartment and extended to a position where it overlapped, and the rear end extended to a position directly below a cross member attached to the upper surface of the floor structure of the passenger compartment. A fourth underfloor frame.
The third and lower underfloor frames, the fourth underfloor frame, and the floor structure of the cabin are connected and fixed at a position where the first and third underfloor frames are jointed.

Thus, the floor structure is reinforced by the plurality of underfloor frames divided in the vehicle longitudinal direction. The transmission of the impact from the front frame is also performed by these underfloor frames, but since the connection and fixing are performed in a dispersed manner, concentrated weakened portions are not generated. For example, the connection between the first underfloor frame to which the impact from the front frame is transmitted first and the floor structure of the passenger compartment is performed at a plurality of different front-rear positions and in a joined state with different members. Also, the fourth underfloor frame is
It extends to a position directly below the cross member attached to the upper surface of the floor structure of the passenger compartment, and the rigidity of the floor is further increased by joining these overlapping members.

According to a third aspect of the present invention, in the floor frame structure for a vehicle body, each of the members is connected and fixed by spot welding. The provision of the notch prevents welding of four or more members. Thereby, the welding and fixing in the three-sheet overlapping state, which is the effective compensation range of the spot welding, is reliably performed, so that the stabilization of the joint fixing state is achieved.

According to a fourth aspect of the present invention, there is provided a floor frame structure for a vehicle body, wherein the floor portion of the vehicle body is constituted by a plurality of units including a front frame positioned in front of the passenger compartment and a floor structure for the passenger compartment. A first underfloor frame having a front end horizontally opposed to the cabin end of the frame and fixed to a lower surface of a floor structure of the cabin, wherein the front side of the first underfloor frame is provided; A fragile portion having a predetermined length is provided near the end, and a rear end of the fragile portion substantially coincides with at least a front end of an opening that is closed by a front door of the vehicle, or is located in front of the position. Located on the side.

Thus, the impact energy from the front of the vehicle body can be absorbed by the fragile portion, and the position of the fragile portion is substantially the same as the front end of the opening of the front door of the vehicle body. Since the front door is located further forward, it is possible to suppress the influence on the openability of the front door due to the impact from the front.

According to a fifth aspect of the present invention, in the floor frame structure for a vehicle body, the fragile portions are formed as a plurality of vertically extending beads aligned in the front-rear direction. Therefore, the fragile portion can be formed with a simple configuration without adding another member to the underfloor frame.

[0019]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing an example of a floor frame structure of a vehicle body according to an embodiment of the present invention. As shown, a front structure 10 is provided at a front portion of the vehicle body, and a front frame 12 is provided at the front structure 10.

In front of the passenger compartment located on the rear side of the front structure 10, a toe board 14 is provided.
Is installed. The toe board 14 includes a portion of an upright portion 14a that separates a passenger compartment from a front portion thereof, and a floor joint 14 that extends so as to be continuous with the floor structure of the passenger compartment.
b. Then, two first underfloor frames 16, which are one of the characteristic components of the embodiment of the present invention, are provided on the left and right (16-1, 16-2).

FIG. 2 is a perspective view of the first underfloor frame 16 (thickness of the members is omitted in the figure. The same applies to the following parts explanatory drawings). As shown in the drawing, the front end portion 16a of the first underfloor frame 16 has a shape which is raised upward, and the impact energy from the front frame 12 is transmitted to this end portion 16a. It can be attached as follows. Also, as shown in FIG.
A flange 16b is formed at the upper end of the underfloor frame 16, and its cross-sectional shape is substantially U-shaped having a bottom 16c.

FIG. 3 shows another configuration of the first underfloor frame 16. As shown in the figure, near the front end 16a of the first underfloor frame 16, two crush beads 16d-1 and 16d-2 are formed substantially in parallel over substantially the entire circumference as grooves inwardly projecting. A part of the impact energy from the front frame 12 is absorbed by this part.

The rear crash bead 16d-2 of the crash bead 16d coincides with the front end of the door opening width O of the vehicle body, ie, the edge of the door opening of the front pillar P when the vehicle is assembled. It is arranged forward of this and absorbs energy at the above-mentioned portions, thereby minimizing the impact of impact energy on the vehicle body, particularly the impact on door opening. In the drawing, reference numeral 1 is used.
00 is a line indicating the door opening.

Next, as understood from FIG. 1, the front end portion 16a of the first underfloor frame 16 is in a state of being sunk under the floor joint portion 14b of the toe board 14 in the installed state. Further, between the floor joint 14b of the toe board 14 and the first underfloor frame 16, second underfloor frames 18-1 and 18-2 are respectively installed. As shown, this second underfloor frame 18 is
It is installed so as to cover a predetermined range of the upper surface of the underfloor frame 16.

FIG. 3 is a perspective view showing the structure of the second underfloor frame 18. As shown in FIG. As shown in the drawing, a concave portion 18 a is formed in the center of the second underfloor frame 18, and this concave portion matches the concave portion of the first underfloor frame 16. The width of the second underfloor frame 18 is formed to be wider than the width of the first underfloor frame 16.

Next, the first underfloor frames 16-1 and 16-1
-2 at the rear end of the third underfloor frame 20-1, 2
0-2 are joined. This joining is performed by the third underfloor frame 2
0 is overlapped from above the first underfloor frame 16. As shown, the third underfloor frame 2
A flange 20a is provided on the entire upper end of the zero. The cross-sectional shape of the third underfloor frame 20 is substantially U
Although it is shaped like a letter, it is formed so that its depth becomes shallower as it approaches the rear end.

Next, the fourth underfloor frames 22-1 and 22-2 that are partially overlapped with the rear end of the second underfloor frame 18 will be described. This fourth
The specific shape of the underfloor frame 22 is shown in FIG.
As shown in FIG.
a and 22b are provided.

The fourth underfloor frame 22 has its front end overlapped on the rear end of the second underfloor frame 18, and the rear end extends to a position directly below a cross member 26 described later. Is installed as follows.

Next, the front floor pan 24 is provided as a floor structure in the passenger compartment, and has an uneven shape corresponding to a loading member of the vehicle. The front end 24a is installed so as to overlap the upper surface of the floor joint 14b of the toe board 14. That is, the front floor pan 24 is located above the first underfloor frame 16, the second underfloor frame 18, the third underfloor frame 20, and the fourth underfloor frame 22. That is, each underfloor frame member is attached to the lower surface side of the front floor pan 24.

Next, the mounting state of each member will be described with reference to FIG. As shown in the drawing, first, the first underfloor frame 16 has its flange portion 16b welded and fixed together with the floor joint portion 14b of the toe board 14 and the second underfloor frame 18 at a location indicated by a dashed line a in the figure. . In the present embodiment, these connections are fixed by spot welding.

The second underfloor frame 18 extends at least to a range including a position below a joint between the floor joint 14b of the toe board 14 and the front floor pan 24 which is a floor structure of the cabin. The front floor pan 24, the floor joint 14b of the toe board 14, and the second underfloor frame 18 are fixed by spot welding at the position of the chain line B. This welding is performed at a position outside the flange portion 16b of the first underfloor frame 16 located below the members so as not to perform a welding operation in a state where four members are overlapped (the first underfloor frame). 16 is formed to be narrower than the width of the second underfloor frame 18).

Next, the third underfloor frame 20 is installed with its front end overlapped with the rear end of the first underfloor frame 16 from above. A welding connection is made between the first underfloor frame 16 and the installation portion, that is, at the bottom or possibly the side of the frame.

A fourth underfloor frame 22 is provided above the third underfloor frame 20. That is, the fourth underfloor frame 22 is the first underfloor frame 1
6 and the third underfloor frame 20 are provided at positions covering the overlapped portion, and the flange portion 16b of the first underfloor frame 16, the flange portion 20a of the third underfloor frame 20, Spot welding is performed at the place where the frame 22 and the front floor pan 24 overlap. Since this welding is performed at the part of the notch portion 20b of the flange portion 20a of the third underfloor frame 22 shown in FIG. 4, the spot welding operation is performed on three members.

Further, the front end of the fourth underfloor frame 22 extends to a position where it is partially inserted between the overlapping portion of the second underfloor frame 18 and the front floor pan 24, and this overlapping portion, that is, in the drawing, Spot welding is performed at the position indicated by the dashed line C. Although the flange portion 16b of the first underfloor frame 16 exists in this portion, since the welding operation is performed outside the flange portion 16b, the target members for spot welding are three overlapping portions.

Next, a cross member 26 for reinforcing the floor is installed above the front floor pan 24 in a direction perpendicular to the front-rear direction of the vehicle body.
Has a configuration in which its rear end extends at least to a position directly below the cross member 26. Then, the portions indicated by the dashed lines E and F in the figure, that is, the cross members 26
Flange portion 26a, front floor pan 24 and fourth
Spot welding is performed at a portion where three underfloor frames 22 overlap.

FIG. 7 shows an example of the structure of the cross member 26, and it is understood that a flange portion 26a is formed below the cross member 26.

FIG. 8 shows the first, second, third and fourth parts.
The arrangement relationship between the underfloor frames (16, 18, 20, and 22) and the cross member 26 is shown.
Although not shown, a front floor pan 24 which is a floor structure of a passenger compartment is installed between the floor frame 6 and each of the underfloor frames 16, 18, 20, 22.

By the above arrangement and the work of welding and fixing the members to each other, the underfloor frame for reinforcing the floor portion of the floor portion of the vehicle body composed of a plurality of units is also divided into a plurality of frames which are also divided in the longitudinal direction of the vehicle body. With the configuration including the unit, it is possible to dispose the underfloor frame in accordance with the unit structure of the vehicle body floor. In addition, since the underfloor frame composed of a plurality of frame members is welded and fixed at different positions in the front-rear direction and between different members, it is possible to avoid the occurrence of concentrated fragile portions. Have been.

At the joint between the floor joint 14b of the toe board 14 and the front floor pan 24, which is an important component of the floor, there is a second under-floor frame 18 installed above the first under-floor frame 16. At the joint between the first underfloor frame 16 and the third underfloor frame 20, there is a fourth underfloor frame superimposed on the upper part. That is, the joints of these important components are reinforced by separate underfloor frame members.

Further, a joint between the second underfloor frame 18 and the fourth underfloor frame 22 having the above-described reinforcing function is disposed at an intermediate position in the front-rear direction between the two joints, and welding is performed at the joint. The configuration is such that the connection is performed.

It should be noted that the present invention is not limited to the configuration shown in the above embodiment, and various modifications are possible within the scope of the invention. For example, the shape of each underfloor frame is not limited to the shape described in the above embodiment, and other shapes can be used as long as sufficient strength can be obtained. In addition, although an example using spot welding has been shown for the connection of the mutual members, the present invention is not limited to such a connection means, and other connection means can be used as long as a secure fixing state can be obtained.

[0042]

As described above, according to the floor frame structure for a vehicle body of the present invention, a vehicle body having a floor formed by a plurality of units is provided with a floor reinforcement formed on the lower surface of the floor. The underfloor frame member can easily cope with the unit assembly of the floor, and reinforces the floor, reliably transmits the impact from the front of the vehicle body to the floor, and disperses and attenuates it. It has become possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration perspective view of a floor frame structure according to an embodiment.

FIG. 2 is a perspective view of a first underfloor frame according to the embodiment.

FIG. 3 is a perspective view showing another configuration example of the first underfloor frame.

FIG. 4 is a perspective view of a second underfloor frame according to the embodiment.

FIG. 5 is a perspective view of a third underfloor frame according to the embodiment.

FIG. 6 is a perspective view of a fourth underfloor frame according to the embodiment.

FIG. 7 is an explanatory diagram of a mounted state and a connected state of each underfloor frame according to the embodiment.

FIG. 8 is a perspective view showing an example of a cross member installed on the floor frame structure according to the embodiment.

FIG. 9 is an explanatory diagram showing a positional relationship between each underfloor frame and a cross member.

[Description of Signs] 10 Front structure 12 Front frame 14 Toe board 14b Floor joint 16 First lower floor frame 18 Second lower floor frame 20 Third lower floor frame 22 Fourth lower floor frame 24 Front floor pan

Claims (5)

[Claims] 1. A floor portion of a vehicle body is constituted by a plurality of units including a front frame positioned in front of a passenger compartment, a floor structure in a passenger compartment, and a rear floor structure located in a rear portion of the passenger compartment. A first underfloor frame having a front end horizontally opposed to a passenger compartment side end of the frame, and fixed to a lower surface of a floor structure of the passenger compartment; a front frame and a floor structure of the passenger compartment; A toeboard provided between the first floor and a standing portion located at the front of the cabin and a floor joint that is superimposed on the lower surface of the floor structure of the cabin by abutting the upper surface thereof; It is installed between the frame and the floor joint of the toe board so as to cover an intermediate region of the upper surface of the first underfloor frame, and a rear end is at least a lower part of the floor structure of the passenger compartment of the toe board. Overlap of floor joints And a second underfloor frame extending beyond the floor portion, comprising: a floor structure of the cabin, a floor joint of the toeboard, and an overlapped portion of the second underfloor frame. A floor frame structure of a vehicle body characterized by the following. 2. A third underfloor frame, which is joined and installed on the lower surface side of the floor structure of the passenger compartment, with a front end portion being overlapped with a rear end portion of the first underfloor frame from an upper surface side thereof, On the lower surface side of the floor structure of the cabin, on the upper surface of the third underfloor frame, the front end is beyond the front end of the third underfloor frame, and the rear end of the second underfloor frame A fourth underfloor frame extending to a position inserted between the floor structure of the passenger compartment and a rear end extending to a position directly below a cross member attached to an upper surface of the floor structure of the passenger compartment. And the fourth underfloor frame straddles the joint between the first underfloor frame and the third underfloor frame, and has a front end on the second underfloor frame and a rear end on the third underfloor frame. 2. The fixing device according to claim 1, wherein Floor frame structure of the body. 3. The joining and fixing of the respective members is performed by spot welding, and in a portion where four or more members to be welded are overlapped, a predetermined cut-out portion is provided for a predetermined member to overlap the four members. 3. The floor frame structure for a vehicle body according to claim 1, wherein the welding of the above members is prevented. 4. A floor portion of a vehicle body is constituted by a plurality of units including a front frame positioned in front of a passenger compartment and a floor structure of a passenger compartment, and horizontally opposed to a passenger compartment side end of the front frame. A first underfloor frame fixed to the lower surface of the floor structure of the passenger compartment, and a fragile portion having a predetermined length near the front end of the first underfloor frame. A vehicle body characterized in that a rear end of the fragile portion is disposed at a position substantially coincident with a front end of an opening closed by at least a front door of the vehicle, or at a position further forward than the front end. Floor frame structure. 5. The floor frame structure for a vehicle body according to claim 4, wherein the fragile portion is a vertically extending bead that is aligned in a plurality of longitudinal directions.