JP2001354158A - Car body lower part structure in automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a rear member to strongly resist a load when applying the load of the moment to the rear member of a side member provided in a car body frame at head-on collision time, and enable the rear member to strongly resist the load with simple constitution. SOLUTION: A front member 26 of the side member 18 positioned in front of a kickup part 25 is positioned so as to become higher by a certain height dimension H than the rear member 27 of the side member 18 positioned in the rear of the kickup part 25. A floor panel 38 is supported by an upper surface 27a of the rear member 27, and front and rear seats 50 and 51 are arranged on this floor panel 38. The upper surface 27a of the rear member 27 up to reaching the kickup part 25 from the front vicinity of the rear seat 51 is formed as an inclined face extending upward and extending in an almost straight line in a side view of a car body 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower body structure of an automobile in which a side member of a body frame has a kick-up portion.

[0002]

2. Description of the Related Art The underbody structure of the above-mentioned automobile includes:
Conventionally, there is one disclosed in Japanese Utility Model Application Laid-Open No. 64-21076.

According to the above publication, a body frame constituting a vehicle body of an automobile is provided with a pair of left and right side members extending in the front-rear direction of the vehicle body. In the side view of the vehicle body, a midway portion of the side member in the longitudinal direction is bent to form a kick-up portion, and a front member of the side member located forward of the kick-up portion is formed by a kick-up portion. Is also higher than the rear member of the side member by a certain height.

A floor panel is supported on the upper surface of the rear member. Normally, front and rear seats are provided on the floor panel and are supported by the floor panel.

[0005]

In the prior art, the front member is located higher than the rear member with respect to the kick-up portion of the side member. When a large impact force is applied to the front member from the front, such as at the time of a front collision that collides with an object in front, the front member is positioned higher than the front end of the rear member. Depending on the height dimension, a large moment is applied to the rear member, and in particular, a stress concentration tends to occur at a joint portion of the rear member to the kickup portion, which is not preferable in terms of the strength of the vehicle body.

The thickness of the rear member is reduced abruptly in the middle from the front end to the rear end.
A break in strength occurs in the middle part.
For this reason, stress concentration tends to occur in the middle part of the rear member due to the load of the moment, which is also unfavorable in the strength of the vehicle body.

The present invention has been made in view of the above circumstances. When a moment load is applied to a rear member of a side member provided in a vehicle body frame, for example, at the time of a front collision, the rear member is set to the above position. The task is to be able to firmly resist loads.

It is another object of the present invention to ensure that the rear member firmly opposes the load with a simple configuration.

[0009]

The underbody structure of the vehicle according to the present invention for solving the above-mentioned problems is as follows.

According to the first aspect of the present invention, the vehicle body frame 3 includes a pair of left and right side members 18 extending in the front-rear direction of the vehicle body 2. Thus, a kick-up portion 25 is formed, and a front member 26 of the side member 18 located forward of the kick-up portion 25 is a rear member 27 of the side member 18 located rearward of the kick-up portion 25. The height of the rear member 27 is higher than that of the rear member 27 by supporting the floor panel 38, and the front and rear seats 50 and 51 are disposed on the floor panel 38.

The upper surface 27a of the rear member 27 from near the front of the rear seat 51 to the kick-up portion 25 extends upward and forward in a side view of the vehicle body 2, and
The inclined surface extends almost linearly.

According to a second aspect of the present invention, in addition to the first aspect, the lower surface 27b of the rear member 27 has an inclined surface extending upward and substantially linearly in a side view of the vehicle body 2. It was done.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

In the drawing, reference numeral 1 denotes an automobile, and an arrow Fr
Indicates the front.

The vehicle body 2 of the vehicle 1 is made of sheet metal. The vehicle body 2 has a body frame 3 constituting a lower end thereof, and an upper space of the vehicle body 2 which is supported by the body frame 3 and has an internal space. A body body 5 having a vehicle compartment 4 and a body frame 3 positioned below a front portion of the body frame 3.
, The sub-frame 9 supported by the front and rear support members 7 and 8
The vehicle body 2 is substantially symmetrical with respect to the center of the vehicle body 10 passing through the center in the width direction.

The suspension 12 is mounted on the sub-frame 9.
A pair of left and right front wheels 13 and 13 are suspended by the suspension, and a pair of left and right rear wheels 14 and 14 are suspended from the rear end of the body frame 3 by another suspension. It is supported on a running surface 15 by wheels 14.

The vehicle body frame 3 is connected to the vehicle body center 10.
A pair of left and right side members 18 extending in the front-rear direction of the vehicle body 2 across the vehicle body, and a plurality of (four) cross members 19 extending in the width direction of the vehicle body 2 and joining the side members 18 to each other. 22. The side members 18 each have a longitudinal cross section of an inverted hat shape, and have high strength and rigidity.

When viewed from the side of the vehicle body 2, the side member 18 is bent at a middle portion in the longitudinal direction, and a kick-up portion 25 is formed at the middle portion. The side member 18 located forward of the kick-up portion 25
The rear end of the front member 26 of the
It is positioned so as to be higher by a certain height dimension H than the front end of the rear member 27 of the side member 18 located rearward, and the side member 18 is positioned behind the rear member 27. Another rear member 28 is provided. The sub-frame 9 is press-formed, and the kick-up portion 25, the front member 26, the rear member 27, and the other rear member 28 are integrally and firmly connected to each other.

The front support members 7 are provided as a pair of left and right sides.
1, a fastener 32 having an axial center extending in a substantially vertical direction for fastening the protruding end of the support arm 31 to the rear end of the front member 26, and an intermediate member between the support arm 31 and the fastener 32. And a rubber elastic body 33 provided.

The outer side of the rear end of the sub-frame 9 is disposed below and near the front end of the rear member 27. The left and right rear supports 8 are provided as a pair, and each of the rear supports 8 has an axial center for extending the outer portion of the rear end of the sub-frame 9 to the front end of the rear member 27 and extends substantially vertically. A tool 35 and a rubber elastic buffer 36 interposed between the sub-frame 9 and the fastener 35 are provided.

The body body 5 constitutes a lower end portion thereof and includes the kick-up portion 25 and the rear members 27 and 2.
8, a pair of left and right side walls 39, 39 extending upward from respective side edges of the floor panel 38, and bridged on upper end edges of the side walls 39, 39. And the roof panel 40 to be joined together, and the members 38, 39,
The interior space surrounded by 40 is the vehicle compartment 4.

The floor panel 38 extends so as to be directly joined to the kick-up portion 25 and the upper surface of each of the rear members 27 and 28, and is connected to this upper surface by spot welding (indicated by X in the drawing). Has been supported.
The cross member 20 is connected to the floor panel 38.
The cross member 20, the rear member 27 of the side member 18, and the floor panel 3
8 are superimposed on each other in the vertical direction and are joined by spot welding.

A side door device 42 is provided on each of the left and right side surfaces of the vehicle body 5. Each of these side door devices 42 has a front door opening 43 formed at a front portion of each of the side walls 39, a rear door opening 44 formed at a rear portion of the side wall 39, and these door openings 43, 44 can be freely opened and closed. And a door 45 that is closed at the same time.

The lower edge of each of the door openings 43 and 44 is a side sill 47 extending in the front-rear direction. These side sills 47 are located outside the side members 18 and are substantially parallel to the side members 18. Have been. Each of the side sills 47 has a large strength and rigidity due to the closed section of each section in the longitudinal direction due to the connection of the outer and inner panels. Each side sill 47
Is the body frame 3 by the cross members 20 and 21.
And are reinforced with each other.

The upper surface of the side sill 47 extends substantially horizontally in the front-rear direction. The upper surface of the side sill 47 is located slightly higher than the upper surface of the rear member 27 and the upper surface of the floor panel 38. The outer edges of the floor panel 38 are joined by spot welding to the middle part in the vertical direction on the side surface of the side sill 47 on the vehicle compartment 4 side.

The front and rear edges of the door openings 43 and 44 are formed as pillars 48 extending vertically, respectively.
Each of these pillars 48 has a large strength and rigidity due to a closed cross section of each part in the longitudinal direction due to the connection of the outer and inner panels.

In the cabin 4, the floor panel 3
A pair of left and right front seats 50, 50 are arranged and supported at the front part on the upper side 8. Behind the front seats 50, 50,
A rear seat 51 is provided at a rear portion on the floor panel 38 and supported.

As viewed from the side of the vehicle body 2, the front door opening 4
3, the front seat 50 is displaced to the rear side, and the rear seat 51 is displaced to the rear side of the rear door opening 44.
Are arranged, and the occupant 52 can be seated on each of the front seat 50 and the rear seat 51 in a forward direction. Each of the occupants 52 is allowed to get on and off the passenger compartment 4 through each of the door openings 43 and 44.
The passenger can get on and off the passenger compartment 4 over the upper surfaces of the front portions 3 and 44.

In the above structure, the upper surface 27a of the rear member 27 from near the front of the rear seat 51 to the kick-up portion 25 extends upward and substantially linearly in a side view of the vehicle body 2. It is an inclined surface that extends.

Therefore, the upper surface 27 of the rear member 27
The height dimension H can be kept small because a is a slope that rises forward.

Therefore, when a large impact force is applied to the front member 26 of the side member 18 from the front, such as at the time of a front collision of the vehicle 1, the height dimension H is reduced as described above. The load of the moment applied to the rear member 27 is suppressed to a small value. In particular, a large stress concentration is prevented from being generated at the joint of the front end portion of the rear member 27 to the kick-up portion 25, and the load is prevented from being increased. The rear member 27 can be firmly opposed.

Further, as described above, since the upper surface 27a of the rear member 27 extends linearly, the occurrence of a break in a longitudinally intermediate portion of the rear member 27 is suppressed.

Accordingly, the concentration of stress in the middle of the rear member 27 due to the load of the moment is also prevented, and the rear member 27 can firmly oppose the load also in this point.

As described above, since the upper surface 27a of the rear member 27 extends linearly, the shape of the rear member 27 is correspondingly simplified, and the configuration of the side member 18 is simplified. .

Therefore, the strong opposition of the rear member 27 to the load is achieved by a simple structure.
Since the shape of the rear member 27 is simplified, molding by press molding or the like can be facilitated.

Further, as described above, the door opening 43 is formed in the front part of the side wall 39 of the vehicle body 5 of the vehicle body 2, and the door opening 43 is deflected to the rear side of the door opening 43 in a side view of the vehicle body 2 so as to be forward. A seat 50 is provided, and an occupant 52 is able to get on and off the vehicle compartment 4 over the front upper surface of the lower opening edge (side sill 47) of the door opening 43.

Here, as described above, the rear member 27
The upper surface 27a of the door opening 43 is formed as an inclined surface that rises forward, and the floor panel 38 is supported along the upper surface 27a. 38 will be closer together.

Accordingly, it is easy to get on and off the vehicle while straddling the front part of the lower opening edge of the door opening 43.

On the other hand, if the height of the rear side of the rear member 27 is the same as the conventional one, the foot space of the occupant 52 in the lower front part of the rear seat 51 is kept wide, and a favorable height with respect to the rear seat 51 is maintained. Comfort is ensured.

The lower surface 27b of the rear member 27
Is an inclined surface extending upward and substantially linearly when viewed from the side of the vehicle body 2.

For this reason, it is possible to more reliably prevent a break in the middle part of the rear member 27 in the longitudinal direction.
The occurrence of stress concentration in the middle of the rear member 27 is more reliably prevented.

Further, the shape of the rear member 27 is further simplified, and the configuration of the side member 18 is further simplified.

In addition, as described above, the rear member 27
Since the lower surface 27b of the rear member 27 is an inclined surface that rises forward, an extra space is created below the front end of the rear member 27.

Therefore, as described above, the rear end of the sub-frame 9 is disposed in an extra space below the front end of the rear member 27. Therefore, the sub-frame 9 is provided at a predetermined minimum ground level. It can be installed while securing the height.

In the above case, the rear end of the sub-frame 9 is supported by the front end of the rear member 27 from below, so that the rear end of the rear member 27 extends outward from the front end of the rear member 27. Provide a projecting bracket,
Compared to a conventional case in which the rear end of the sub-frame 9 is supported by the projecting end of the bracket,
And the supporting strength is improved.

Further, when viewed from the side of the vehicle body 2, the thickness of the rear member 27 is formed so as to gradually increase toward the front.

For this reason, the thickness of the connecting portion of the front end portion of the rear member 27 with respect to the kick-up portion 25 becomes larger, the strength thereof is sufficiently improved, and stress concentration occurs at the connecting portion. It is surely prevented.

[0048]

The effects of the present invention are as follows.

According to the first aspect of the present invention, the vehicle body frame includes a pair of left and right side members extending in the front-rear direction of the vehicle body, and the kick-up portion is formed by bending a middle portion in the longitudinal direction of the side member in a side view of the vehicle body. Is formed such that the front member of the side member positioned forward of the kick-up portion is higher than the rear member of the side member positioned rearward of the kick-up portion by a certain height dimension. In the automobile, the floor panel is supported on the upper surface of the rear member, and the front and rear seats are disposed on the floor panel.

The upper surface of the rear member from the vicinity of the front of the rear seat to the kick-up portion is an inclined surface extending upward and substantially linearly when viewed from the side of the vehicle body.

For this reason, the height dimension can be kept small because the upper surface of the rear member is an inclined surface that rises forward.

Therefore, when a large impact force is applied to the front member of the side member from the front, such as at the time of a front collision of an automobile, the height of the rear member is reduced as described above. The load of the applied moment is suppressed to a small value, and in particular, a large stress concentration is prevented from being generated at a joint portion of the front end portion of the rear member to the kick-up portion, and the rear member can strongly resist the load. Becomes

Further, as described above, since the upper surface of the rear member extends linearly, the occurrence of a break in a longitudinally intermediate portion of the rear member is suppressed.

Accordingly, the concentration of stress in the middle of the rear member due to the moment load is also prevented. In this respect, the rear member can firmly oppose the load.

Further, as described above, since the upper surface of the rear member extends linearly, the shape of the rear member is correspondingly simplified, and the configuration of the side member is simplified.

Therefore, the strong resistance of the rear member to the load can be achieved by a simple structure, and the rear member can be formed easily because the shape of the rear member is simplified.

According to a second aspect of the present invention, the lower surface of the rear member is an inclined surface extending upward and substantially linearly when viewed from the side of the vehicle body.

[0058] For this reason, it is possible to more reliably prevent a break in the middle portion of the rear member in the longitudinal direction, and to more reliably prevent stress concentration in the middle portion of the rear member.

Further, the shape of the rear member is further simplified, the structure of the side member is further simplified, and the effect of the first aspect of the present invention is promoted.

[Brief description of the drawings]

FIG. 1 is an overall simplified side view of a vehicle body.

FIG. 2 is an overall simplified plan view of a vehicle body.

FIG. 3 is a partially enlarged sectional view of FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 2 Body 3 Body frame 4 Cab 5 Body body 7, 8 Support 9 Subframe 18 Side member 20 Cross member 25 Kickup part 26 Front member 27 Rear member 27a Upper surface 27b Lower surface 38 Floor panel 39 Side wall 43, 44 Door opening 47 Side sill 50 Front seat 51 Rear seat 52 Occupant H Height dimensions

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuo Kawamoto 2-1-1 Taoyuan, Ikeda-shi, Osaka Daihatsu Industry Co., Ltd. (72) Kazuhiro Fujimoto 2-1-1 Taoyuan, Ikeda-shi, Osaka Daiha F-term (for reference) within Tsutsu Kogyo Co., Ltd. 3D003 AA01 AA04 AA05 BB01 CA09 CA18 CA48 DA24

Claims (2)

[Claims] 1. A vehicle body frame comprising a pair of left and right side members extending in the front-rear direction of a vehicle body, and forming a kick-up portion by bending a middle part in a longitudinal direction of the side member in a side view of the vehicle body. The front member of the side member positioned forward of the kick-up portion is positioned higher than the rear member of the side member positioned rearward of the kick-up portion by a certain height, and the rear member is In a vehicle having a floor panel supported on the upper surface of the vehicle and front and rear seats disposed on the floor panel, the upper surface of the rear member from near the front of the rear seat to the kick-up portion is formed on the side of the vehicle body. The lower body structure of an automobile having an inclined surface that extends upward and extends substantially linearly. 2. The vehicle body lower part structure according to claim 1, wherein the lower surface of the rear member is an inclined surface extending upward and substantially linearly when viewed from the side of the vehicle body.