JP2001301645A - Frame structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body frame structure for an automobile capable of sufficiently dispersing and absorbing the shock energy from the front in the whole body member. SOLUTION: A side member 10 is provided with a front range 10A extended in the longitudinal direction in the front of a tow board 2, a slant range 10B having a lower face section 11a continuously formed at the rear end of the front range 10A and extended along the front face of the tow board 2 and a nearly U-shaped cross section, and a rear range 10C having a lower face section 11b continued to the lower face section 11a via an inflection point (a) at the front end, extended along the lower face of a floor 5, continued in the longitudinal direction, and having a nearly U-shaped cross section. A rear fitting section 25 connected to a front fitting section 21, a front bulkhead 22, an apex 23 facing the floor 5 via a gap, a rear bulkhead 24, and the lower face section 11b is continuously formed. A separator 20 protruded on the side view astride the inflection point (a) is arranged in the cross section of the side member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure of an automobile, and more particularly, to a reinforcing structure of a side member.

[0002]

2. Description of the Related Art An automobile body frame is disclosed in, for example, Japanese Patent Application Laid-Open No. 11-208503, and an engine room 101 and a vehicle compartment 102 are formed as shown in FIG. The toeboard 103 and a floor 104 continuously formed at the lower end of the toeboard 103 are divided into a lower portion of the engine room 101 and a vehicle room 102.
Has a step with the floor 104, and side members 105 extending in the front-rear direction along the side of the vehicle body extend relatively straight in the engine room 101 in the front-rear direction, abut against the toe board 103, and bend. Bent downward by the portion 105a and extended along the front surface of the toe board 103;
Further, the bent portion 105 near the lower end of the toe board 103
b, and is extended rearward of the vehicle body along the lower surface of the floor 104 and connected to the vehicle body members such as the floor 104 and side sills.

Further, in the engine room 101,
The front end of the subframe 108 supporting the engine 106 and the front wheels 107 and the like is connected near the front end of the side member 105, and the rear end is connected to the side member 105 near the bent portion 105b.

Further, FIG. 6 shows an essential part of the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 58-58979, and FIG.
As shown in FIG. 7 in a sectional view taken along the line I, the side members 105 are provided on the upper surfaces of the bent portions 105a and 105b of the side members 105 below the toe board 103 and the floor 104.
And a reinforcement member 109 that forms a closed cross section that is continuous in the front-rear direction in cooperation with the above.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
According to Japanese Patent Publication No. 8503, a side member 105 extends in the engine room 101 in a relatively linear manner in the front-rear direction, is bent by bent portions 105a and 105b, and extends from the toe board 103 along the lower surface of the floor 104 to the vehicle body. The side member 105 is extended rearward and the shape of the side member 105 changes rapidly at the bent portions 105a and 105b.

When an impact load P from the front is applied to a vehicle provided with such a side member 105, the impact load P input to the front end of the side member 105 changes its shape rapidly and its sectional rigidity changes. Bent portions 105a and 105
There is a concern that the bending portions 105a and 105b may be bent and deformed by concentrating on b.

When the bent portions 105a and 105b are bent and deformed, the deformed toeboard 103 and the like enter the vehicle interior due to the change, and the load on the vehicle body members such as the floor 104 and the side sill from the rear portion of the side member 105 is reduced. Dispersion transmission becomes difficult, and smooth crushing deformation from the front end of the side member 105 is hindered.
In some cases, absorption of impact energy may not be achieved due to the deformation of No. 05.

According to Japanese Utility Model Laid-Open Publication No. 58-58979, the bent portions 105a and 105a of the side member 105 are provided.
By providing the reinforcing member 109 which forms a closed cross section in cooperation with the side member 105 on the upper surface of 05b, the rigidity is improved in the range including the bent portions 105a and 105b.

However, since the cross-sectional shape of the portion of the side member 105 reinforced by the reinforcing member 109 and the portion adjacent thereto, that is, the vicinity of the end of the reinforcing member 109 greatly changes, the side member 105 is impacted from the front. When a load is applied, the load is concentrated on the portion, and bending deformation occurs near the bent portions 105a and 105b, so that sufficient load distribution and absorption of impact energy may not be obtained.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vehicle body frame structure for an automobile in which an impact load with respect to a front impact load is dispersed throughout the vehicle body members and sufficient impact energy is absorbed. It is in.

[0011]

According to a first aspect of the present invention, there is provided an automobile body frame structure, wherein a side member has a front region extending in a front-rear direction in front of a toe board, and a rear end of the front region. A lower surface portion formed continuously with the toe board and extending along the front surface of the toe board to form a closed cross-sectional shape together with the toe board, and a substantially U-shaped cross-section having both side surfaces bent along both side edges of the lower surface portion. The floor having an inclined range, a lower surface portion whose front end is continuous with the lower surface portion via a point of inflection, and both side surfaces formed by bending both side edges of the lower surface portion and being continuous with the side surface. A front section that has a substantially U-shaped cross section that is continuous in the front-rear direction and a front mounting section, a front partition wall, and a top section that are opposed to the floor via a gap, and a rear partition wall that are coupled to the lower surface of the inclined range. A rear mounting portion coupled to a lower surface portion of the rear region. To the above front barrier ribs with the connection formed, a top, by the rear bulkhead, characterized in that the side view protrusion-shaped separator across the inflection point is disposed in the side members of the section.

According to the first aspect of the present invention, the separator
The front mounting portion and the rear mounting portion are coupled to each lower surface portion at a point of inflection, and are formed in a protruding state in a state where the front partition, the top portion, and the rear partition prevent contact with the lower surface of the side member and the floor. Therefore, the rigidity in the front-rear direction is relatively low, and a sudden change in rigidity of the side member due to the load in the front-rear direction due to the attachment of the separator is avoided.
The impact load input to the front end of the side member from the front is
The transmission can be reliably transmitted from the front area to the rear area via the inclination area, and can be distributed and transmitted from the floor or the like to the entire vehicle body.

Further, when an impact load exceeding a predetermined value is input to the front end of the side member, the impact load is transmitted from the front range to the inclined range, and the portion where the front mounting portion of the separator is mounted is substantially moved in the load input direction. And the front partition is pushed away, and the top portion abuts on the floor and is received to prevent deformation of the side members. As a result, the impact load is effectively distributed and transmitted to the entire vehicle body.

Further, when an excessive impact load is applied from the front, the relatively linear front portion is smoothly compressed from the front end, that is, collapsed, and the side member absorbs effective impact energy. Is obtained, and the impact on the passenger compartment and the like is reduced.

According to a second aspect of the present invention, in the vehicle frame structure of the first aspect, the front partition of the separator extends substantially parallel to a load input direction to a portion of the lower surface where the front mounting portion is mounted. It is characterized by being present.

According to the second aspect of the present invention, the front partition wall of the separator extends substantially parallel to the load input direction.
When the front bulkhead is pushed substantially in the load input direction and the top comes into contact with the floor, the front bulkhead is stretched between the lower surface of the side frame and the floor substantially along the load input direction, and the front bulkhead is efficient. Thus, the deformation of the side member can be prevented.

According to a third aspect of the present invention, in the vehicle frame structure of the first or second aspect, the rear partition wall extends substantially perpendicular to the floor, and the top portion extends substantially parallel to the floor. It is characterized by doing.

According to the third aspect of the present invention, since the rear partition wall extends substantially perpendicularly, the rear partition wall extends substantially perpendicularly to the load input direction and is prevented from affecting the shape of the separator. Is formed substantially parallel to the floor, it can be reliably received by the floor.

According to a fourth aspect of the present invention, in the vehicle frame structure according to the first to third aspects, the rear mounting portion is a mounting base of a sub-frame.

According to the fourth aspect of the present invention, since the rear mounting portion functions as a mounting base for the sub-frame, the bonding strength of the rear end of the sub-frame is secured, and a dedicated mounting base for mounting the sub-frame is not required. And the configuration can be simplified.

According to a fifth aspect of the present invention, in the vehicle frame structure of the first to fourth aspects, the top portion is arranged at a predetermined distance from the floor.

According to the fifth aspect of the invention, the deformation of the side member can be more effectively controlled by adjusting the distance between the top and the floor.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle body frame structure according to the present invention will be described below with reference to FIGS.

FIG. 1 is a side view schematically showing a front portion 1 of a vehicle body, which is divided into an engine room 3 and a vehicle compartment 4 by a toe board 2. A separator 20 to be described later is provided in the side member 10 and a sub-frame 30 for supporting an engine, front wheels and the like is provided on the lower surface. .

The side member 10 has a relatively linear shape along the lower side in the engine room 3 as shown in the perspective view of the main part of the vehicle body front part 1 from which the sub-frame 30 is omitted in FIGS. A substantially rectangular closed cross-sectional shape extending in the front-rear direction is formed in cooperation with the side member outer 11, and the rear end is the toe board 2.
And a hat having a substantially rectangular closed cross-section that cooperates with the toe board 2 along the front surface of the toe board 2 continuously to the rear end of the front area 10A via the bent portion 10a. And a substantially rectangular shape extending in the front-rear direction along the lower surface of the toeboard 2 and the floor 5 in cooperation with the toeboard 2 and the floor 5 continuously at the lower end of the inclination range 10B via the bent portion 10b. A rear region 10C that forms a closed cross-sectional shape is connected to the side sill 7 via a cross member 6 or the like coupled to the floor 5.

FIG. 3 is an exploded perspective view of a part A of FIG. 1 and FIG.
The structure near the bent portion 10b of the side member 10 will be described with reference to FIG.

The side member 10 in the portion A is a lower surface portion 11a in an inclined range 10B facing the toe board 2.
Has a lower surface 11 continuously formed through a bending point a extending in the vehicle width direction, and both edges of the lower surface 11. A substantially hat-shaped cross section having a side surface 12 bent upward along the upper side and a flange 13 bent along the upper end edge of the side surface 12 and coupled to the toe board 2 and the floor 5. A mounting hole 11c for mounting the subframe is formed in the lower surface 11b of the area 10C.

On the other hand, the separator 20 includes a substantially rectangular front mounting portion 21, a front partition 22, a top 23, and a rear partition 24.
And a bent portion 20 in which the rear mounting portion 25 extends in the vehicle width direction.
a, 20b, 20c, and 20d are successively formed in this order, and in particular a plate-like shape in which the width of the top portion 23 in the front-rear direction is set relatively small, and is formed on both side edges of the front partition 22, the rear partition 24, and the rear mounting portion 25. Reinforcing flanges 22a, 24a, 25 extending along the side members 12 along
a is bent and a mounting hole 25c corresponding to the mounting hole 11c formed in the bottom surface portion 11b is formed in the rear mounting portion 25, and a nut 26 is formed corresponding to the mounting hole 25c.
Are welded.

The front mounting portion 21 can be overlapped on the lower surface portion 11a of the side member 10, and the front partition wall 22 formed by bending at the bent portion 20a can be used when an impact load P acts on the side member 10 from the front. The portion 11d of the lower surface portion 11a to which the front mounting portion 21 is attached extends in the direction in which the portion 11d is initially deformed, that is, extends in the direction of the floor 5 from the bent portion 20a substantially in parallel with the load input direction to the portion 11d. Is formed.

The rear mounting portion 25 can be superimposed on the lower surface portion 11b of the side member 10, and the rear partition wall 24 formed by bending at the bent portion 20d extends substantially vertically upward and is bent at the bent portion 20b. Partition wall 22 and rear partition wall 24 via
Is formed between the toeboard 2 and the floor 5 so as to be substantially parallel to each other at a joint portion where the toeboard 2 and the floor 5 are overlapped or joined and at a position near the joint portion with a predetermined gap therebetween. ing.

The separator 20 thus formed is
The front mounting portion 21 is connected to the lower surface portion 11a and the rear connecting portion 25 is connected to the lower surface portion 11b across the inflection point a of the lower surface 11 of the side member 10, and the front partition wall 22, the top portion 23, and the rear partition wall 24 bend. It is attached in the cross section of the side member 10 in a substantially inverted V-shaped protruding shape in a side view across the point a.

Further, the rear end of the sub-frame 30 is inserted from below into a mounting hole 30a formed in the rear end, and penetrates through the mounting holes 11c and 25c formed in the side member 10 and the separator 20. It is fixedly mounted by a mounting bolt 31 screwed to the nut 26.

Next, the operation of the thus structured frame structure will be described.

The separator 20 provided on the bent portion 10b of the side member 10 includes a substantially rectangular front mounting portion 21, a front partition 22, a top portion 23, a rear partition 24, and a rear mounting portion 25.
Are bent portions 20a, 20b, 20c extending in the vehicle width direction.
20d, and the front mounting portion 21 and the rear mounting portion 25 are separated from each other at lower surfaces 11a and 11
b, and is formed into a substantially inverted V-shaped projection in side view in a state where the front partition 22, the top 23, and the rear partition 24 avoid contact with the lower surface 11 and the floor 5 of the side member 10. Therefore, the rigidity in the front-rear direction is relatively low, so that the rigidity of the side member 10 due to the load in the front-rear direction due to the attachment of the separator 20 is avoided.

Accordingly, when an impact load P acts on the vehicle from the front, the impact load P input to the front end of the side member 10 is transmitted from the front area 10A of the side member 10 to the rear area 10C via the inclined area 10B. Floor 5,
It is effectively distributed and transmitted to the entire vehicle body via the cross member 6, the side sill 7, and the like.

Further, when an impact load P equal to or more than a predetermined value is input to the front end of the side member 10, the impact load P is transmitted from the front area 10A to the inclined area 10B, and is bent.
Is slightly deformed, that is, deformed around the inflection point a of the side member 10, and the portion 11d of the separator 20 to which the front mounting portion 21 is mounted is deformed substantially in the load input direction.

Following the deformation of the portion 11d, the front partition wall 22 is pushed in the extending direction, that is, substantially in the load input direction, and the rear partition wall 24 swings about the folding curve 20d while the top wall 23 moves.
Is moved and pressed against the lower surface of the floor 5, the movement of the top 23 is prevented by the rear partition 24, and the front partition 22 bridged between the portion 11 d and the floor 5 substantially along the load input direction. 11d is prevented, and the lower surface portion 1 in front of the side member 10 across the inflection point a of the side member 10.
A cross section extending in the vehicle width direction in a substantially inverted V-shape in a side view by a front partition 22 and a rear partition 24 bridged between the floors 1a and 11b and the floor 5, that is, the front partition 22, the rear partition 24 and the lower surface The portions 11a and 11b form a substantially triangular cross-sectional shape in which the top portion 23 is in contact with the floor 5 so that deformation of the bent portion 10b of the side member 10 is prevented.

Further, since the rear partition wall 24 extends substantially perpendicularly to the floor 5, it is possible to avoid the rear partition wall 24 extending substantially perpendicular to the load input direction and affecting the deformation of the separator 20 in the front-rear direction. The top 23 can be effectively received by the floor 5 by being formed substantially parallel to the floor 5.

By preventing deformation of the bent portion 10b, swinging of the inclined range 10B toward the vehicle compartment 4 due to a load from the front is suppressed, and deformation of the bent portion 10a is also prevented.

Therefore, the impact load P input to the front end of the side member 10 is limited to the front area 10A of the side member 10.
Is transmitted to the rear area 10C via the inclined area 10B, and is effectively distributed to the entire vehicle body via the floor 5, the cross member 6, the side sill 7, and the like.

Further, when an excessive impact load P acts from the front, the rear portion 10C of the cross member 10 is supported on the entire vehicle body so as to be able to transmit the load, so that the front portion formed relatively linearly. Smooth compressive deformation from the front end of the range 10A, so-called crush deformation, is ensured, and the side member 1
Thus, the impact energy is absorbed by zero, and the impact on the vehicle compartment 4 and the like is reduced, so that the safety is greatly improved.

Further, the rear mounting portion 25 of the separator 20 which is overlapped and coupled on the lower surface portion 10b of the side member 10
A nut 26 is attached to the rear mounting portion 2 and the rear end of the sub-frame 30 is connected by a bolt 31.
5 functions as a mounting base for the sub-frame 30 to secure the bonding strength at the rear end of the sub-frame 30 and to eliminate the need for a dedicated mounting base for mounting the sub-frame, thereby simplifying the configuration and mounting. Bolt 31 and nut 26
Thereby, the joint strength between the rear mounting portion 25 and the side member 10 is improved, and the deformation of the bent portion 10b caused by the impact load P is more reliably prevented.

[0043]

According to the vehicle body frame structure of the present invention described above, the front mounting portion and the rear mounting portion of the separator are connected to the lower surface of the side member with the point of inflection therebetween, and the front partition, the top, and the rear. Since the partition wall is formed in a protruding shape in a state where contact with the lower surface of the side member and the floor is avoided, the rigidity of the separator in the front-rear direction is relatively low. Such a rigid change is avoided, and the impact load from the front is effectively distributed and transmitted to the entire vehicle body via the side members.

On the other hand, when an impact load exceeding a predetermined value is input to the front end of the side member, the impact load is transmitted from the front area to the inclined area, the front partition wall of the separator is pushed, and the top comes into contact with the floor. The received front wall partitions prevent the side members from being deformed, and the impact load is effectively distributed and transmitted to the entire vehicle body.

When an excessively large impact load is applied from the front, the front portion formed relatively linearly is smoothly crushed and deformed from the front end, so that the impact energy is absorbed by the side members and the vehicle is absorbed. This alleviates the impact on the room or the like. Therefore, by attaching a simple separator to the side member, the safety of the vehicle is effectively improved, which greatly contributes to the improvement of the safety of the vehicle.

[Brief description of the drawings]

FIG. 1 is a side view of a vehicle body front portion schematically showing a vehicle body frame structure according to the present invention.

FIG. 2 is a perspective view of a main part of a vehicle body front part.

3 is an exploded perspective view of a main part of a portion A in FIG. 1;

FIG. 4 is a sectional view taken along line II of FIG. 2;

FIG. 5 is a side view of a vehicle body front part schematically showing an outline of a conventional vehicle body frame structure.

FIG. 6 is a side view showing a conventional vehicle body frame structure.

FIG. 7 is a sectional view taken along line II-II of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body front part 2 Toe board 3 Engine room 4 Cabin room 5 Floor 10 Side member 10a Bent part 10b Bent part 10A Front part range 10B Slope range 10C Rear part area 11 Lower surface 11a, 11b Lower surface part 12 Side surface 20 Separator 21 Front mounting part 22 Front Partition wall 23 Top part 24 Rear partition wall 25 Rear mounting part 26 Nut 30 Subframe 31 Mounting bolt

Claims (5)

[Claims] An engine room and a vehicle compartment are defined by a toe board, and a lower end of the toe board is connected to a front end of the floor of the vehicle compartment, and a front-rear direction extends from a front portion of the engine room along a front surface of the toe board and a lower surface of the floor. The frame structure of the vehicle, wherein the side members extend in the front-rear direction in front of the toe board, and are formed continuously at the rear end of the front area along the front surface of the toe board. A lower surface portion extending to form a closed cross-sectional shape together with the toe board, and an inclined range having a substantially U-shaped cross section having both side surfaces bent along both side edges of the lower surface portion; A lower surface that is continuous with the floor, and has a lower surface that is continuous with the floor, and has a lower surface that is continuous with the lower surface and that is formed on both side edges of the lower surface and is continuous with the side surface. A front portion having a substantially U-shaped rear region, a front mounting portion coupled to the lower surface portion of the inclined region, a top portion facing the front partition and the floor via a gap, a rear partition, and a lower surface portion of the rear region. The rear mounting portion is formed continuously with the front partition, the top portion, and the separator in a side view protruding shape crossing the inflection point by the rear partition is disposed in the cross section of the side member. An automobile frame structure characterized by the above-mentioned. 2. The vehicle frame structure according to claim 1, wherein a front partition wall of the separator extends substantially parallel to a load input direction to a lower surface portion to which the front mounting portion is mounted. . 3. The automobile frame structure according to claim 1, wherein the rear partition wall extends substantially perpendicular to the floor, and the top portion extends substantially parallel to the floor. 4. The vehicle frame structure according to claim 1, wherein said rear mounting portion is a mounting base of a sub-frame. 5. The vehicle frame structure according to claim 1, wherein the top portion is arranged at a predetermined distance from the floor.