JPH04252782A - Automobile lower body structure - Google Patents

Abstract

PURPOSE:To prevent a frame from deforming at a bending part due to impulsion in the front and rear direction of a vehicle body by providing a gusset connecting the frame with a connecting member on either the front side or the rear side in the front and rear direction of the body of a connecting part of the connecting member to the frame. CONSTITUTION:A torque box 7 as a connecting member extending in the vehicle width direction, with which the bending part 6 of a frame 2a is connected to a side sill 3a, is provided between the frame 2a and the side sill 3a. A gusset 9 connecting the torque box 7 to the frame 2a is provided on the front side of the connecting part of the torque box 7 to the frame 2a. A gusset 10 connecting the torque box 7 to the side sill 3a is provided on the rear side of the connecting part of the torque box 7 to the side sill 3a. A reinforcement 11 reinforcing the torque box 7 is provided inside the torque box 7. The force F in front of the body applied on the frame 2a is effectively transmitted to the torque box 7, the gusset 9, the reinforcement 11, the gusset 10, and the side sill 3a.

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 for an automobile.

0002

[Prior Art] As a member constituting the lower part of an automobile body, there is a frame that extends in the longitudinal direction of the vehicle body at an intermediate portion in the vehicle width direction, and a frame that extends in the longitudinal direction of the vehicle body at the outer end of the vehicle body in the vehicle width direction. There are side sills, etc.

Conventionally, in order to improve the rigidity of the lower part of the vehicle body, there has been a vehicle in which a frame and a side sill are connected by a connecting member extending in the vehicle width direction. As this connecting member,
In particular, a connecting member formed in a substantially box shape is provided to prevent vertical twisting between the frame and the side sill (
(hereinafter referred to as a "torque box"). By providing such a connecting member (torque box), it is possible to greatly improve the rigidity of the lower part of the vehicle body.

[0004] By the way, various automobile parts such as a part of the engine and a fuel tank are arranged at the bottom of the car body.
In order to secure storage space for these parts, the frame may be bent and extended in the vehicle width direction or in the vertical direction. (The bent part of this frame is referred to as "
This is called the "bending part." ) The bent part of the frame as shown above is
The connecting member that connects the frame and the side sill may be provided near the connecting portion with the frame. As an example of this, as shown in FIG. 5, which is a plan view schematically showing the configuration of an example of a conventional lower body structure of an automobile, a frame 2a extending from the inside in the vehicle width direction of the left front wheel 12 of the automobile toward the rear of the vehicle body. For example, the bending portion 6 that bends in the vehicle width direction and the side sill 3a extending from the rear of the left front wheel 12 toward the rear of the vehicle body are connected by a torque box 7 formed in a substantially box shape. A known lower body structure for such an automobile is disclosed, for example, in Japanese Patent Application Laid-Open No. 12977/1983.

[0005]

However, if the frame is provided with a bent portion as described above, it is conceivable that the rigidity of the frame will be reduced. For example, as shown in FIG. 5, when a force F is applied to the frame 2a from the front of the vehicle body, the frame 2a may buckle at the bent portion 6 and deform significantly rearward. Therefore, it is desirable to improve the rigidity of the frame, especially the rigidity of the bent portion, to prevent deformation of the frame. To this end, it is conceivable to increase the thickness of the frame itself or to provide many reinforcing members within the bent portions, but this poses problems such as making it difficult to process the frame and increasing the weight of the vehicle.

In view of the above-mentioned problems, the present invention provides a frame having a bending part bent in the vehicle width direction, in which the vicinity of the bending part of the frame and the side sill are connected by a connecting member such as a torque box. An object of the present invention is to provide a lower body structure for an automobile with a simple configuration that can effectively suppress large deformation of the frame even when a strong impact is applied to the frame in the longitudinal direction of the vehicle body. .

[0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the lower body structure of an automobile according to the present invention has a lower body structure extending in the longitudinal direction of the vehicle body at an intermediate portion in the vehicle width direction of the lower part of the vehicle body. a frame having a bending portion that bends into the frame;
A side sill extending in the longitudinal direction of the vehicle body at an outer end in the vehicle width direction of the lower part of the vehicle body, and a side sill extending in the vehicle width direction between the side sill and the frame, near the bent portion of the side sill and the frame. A lower vehicle body structure for an automobile, comprising: a connecting member that connects the frame to at least one of the front side and the rear side in the longitudinal direction of the vehicle body of a connecting part of the connecting member to the frame. It is characterized in that a gusset is provided for connecting the connecting member and the connecting member.

[0008] The above-mentioned "connecting member" includes, for example, a substantially box-shaped torque box that is provided to connect the frame and side sills in order to prevent the frame and side sills from twisting in the vertical direction. .

Further, in order to solve the above problems, the lower body structure of an automobile according to the present invention includes, in addition to the above structure, at least one of the front side and the rear side in the longitudinal direction of the vehicle body of the connecting portion of the connecting member to the side sill. A gusset may be provided to connect the side sill and the connecting member.

0010

[Function] As described above, the lower body structure of an automobile according to the present invention is provided with a frame provided on the front or rear side of the connecting portion with the frame of the connecting member that connects the vicinity of the bent portion of the frame and the side sill. The gusset that connects the connecting member effectively transmits the force applied to the frame in the longitudinal direction of the vehicle body to the side sill via the connecting member, and prevents deformation of the joint between the frame and the connecting member.
Even if a strong impact is applied to the frame in the longitudinal direction of the vehicle body, the frame can be prevented from buckling at the bending portion and being significantly deformed.

Further, in the lower body structure of an automobile according to the present invention, in addition to the gusset provided in the connecting portion of the connecting member to the frame, the connecting member is also provided with the side sill and the connecting member on the front or rear side of the connecting portion with the side sill. By providing a gusset that connects the frame side gusset and the side sill side gusset, the force applied to the frame in the longitudinal direction of the vehicle body can be more effectively transmitted to the side sill via the connecting member, and the frame side gusset and the side sill side gusset can This prevents deformation of the joints with the connecting members and the joints between the side sills and the connecting members, so even if a strong impact is applied to the frame in the longitudinal direction of the vehicle body,
It is possible to more effectively prevent the frame from buckling at the bending portion and being significantly deformed.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the lower body structure of an automobile according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the configuration of the main parts of an automobile lower body structure according to an embodiment of the present invention, and FIG. 2 shows a connecting member and a gusset used in an automobile lower body structure according to an embodiment of the present invention. 3 is a perspective view showing the overall structure of the lower body structure of an automobile according to an embodiment of the present invention, and FIG. 4 is a perspective view schematically showing the structure of the lower body structure of an automobile according to an embodiment of the present invention. FIG.

As shown in FIG. 3, the lower vehicle body structure of this embodiment includes two frames 2a and 2b extending in the longitudinal direction of the vehicle body at an intermediate portion in the vehicle width direction at the lower part of the vehicle body 1; Two side sills 3a and 3b are provided at both outer ends in the vehicle width direction and extend in the longitudinal direction of the vehicle body.

Up frames 4a, 4b extending in the longitudinal direction of the vehicle body are welded to the upper portions of the frames 2a, 2b, respectively.
The upper flange b is welded to the floor panel 5 shown by the two-dot chain line. Further, the two frames 2a and 2b have a bent portion 6 formed in the middle thereof to be bent in the vehicle width direction. A torque box 7 is provided between the frame 2a and the side sill 3a and serves as a connecting member extending in the vehicle width direction that connects the bent portion 6 of the frame 2a and the side sill 3a.

As clearly shown in FIGS. 1 and 2, the torque box 7 is formed into a substantially box shape, and the flange 7a of the torque box 7 is connected to the frame 2a and the up frame 4.
a, the flange 7b is attached to the floor panel 5, and the flange 7c is attached to the floor panel 5.
is welded to the step panel 8 that constitutes a foothold when getting on and off, and the flange 7d is welded to the side sill 3, respectively.
The torque box 7 forms a closed section with these panels. A gusset 9 that connects the torque box 7 and the frame 2a is provided on the front side of the portion of the torque box 7 that is connected to the frame 2a. The gusset 9 has a substantially L-shaped cross section, and the flange 9a is welded to the frame 2a and up frame 4a, the flange 9b is welded to the floor panel 5, and the flange 9c is welded to the torque box 7. forms a closed cross section.

[0016] Also, the side sill 3 of the torque box 7
A gusset 10 that connects the torque box 7 and the side sill 3a is provided on the rear side of the connecting portion with the side sill 3a. The gusset 10 has a substantially L-shaped cross section, and the flange 10a is welded to the torque box 7, the flange 10b to the step panel 8, and the flange 10c to the side sill 3a.The gusset 10 has a closed cross section with these panels. is formed.

Furthermore, a reinforcement 11 for reinforcing the torque box 7 is provided inside the torque box 7. Flange 1 of reinforcement 11
1a is a position substantially facing the joint portion between the flange 9c of the gusset 9 and the torque box 7;
The flange 11b is welded to the inner surface of the gusset 10.
It is welded to the inner surface of the torque box 7 at a position substantially opposite to the joint portion between the flange 10a and the torque box 7.

When a force F is applied to the frame 2a from the front of the vehicle body as shown in FIGS. 3a, and prevents the frame 2a from being significantly deformed at the bending portion 6.

Although the lower body structure of an automobile according to the present invention has been described above based on one embodiment, the lower body structure of an automobile according to the present invention is not limited to this embodiment. For example, although the embodiment described above relates to the front portion of the vehicle body, the present invention can also be applied to the rear portion of the vehicle body or the intermediate portion of the vehicle body.

Further, in the above embodiment, the connecting member connecting the frame and the side sill is the torque box 7 formed in a substantially box shape, but the connecting member is formed in a substantially box shape like the torque box 7. Not limited to things.

Furthermore, in the above embodiment, the gusset 9, reinforcement 11,
Although the gusset 10 is arranged so that the planar cross section thereof is linear, the present invention does not require such an arrangement method, and the gusset 9 alone can be used without providing the reinforcement 11 or the gusset 10. This effect can also be achieved when provided.

Furthermore, the shape of the gusset, the method of joining, etc. can be changed as appropriate, taking into account the shape of the vehicle body, ease of assembly, and the like.

[0023]

Effects of the Invention As described above, according to the lower body structure of an automobile according to the present invention, the connection portion with the frame of the connecting member that connects the side sill with the vicinity of the bent portion provided on the frame that bends in the vehicle width direction. Due to its simple structure, in which a gusset is provided on at least one of the front and rear sides of the frame to connect the frame and the connecting member, even if a strong impact is applied to the frame in the longitudinal direction of the vehicle body, the frame will not bend at the bend. It is possible to prevent buckling and large deformation.

In addition to the above configuration, a gusset for connecting the side sill and the connecting member is provided on at least one of the front and rear sides of the connecting portion of the connecting member to the side sill, thereby making the frame more effective. Deformation due to buckling at the bent portion can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the configuration of the main parts of the lower body structure of an automobile according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a connecting member and a gusset used in the lower body structure of an automobile according to an embodiment of the present invention.

[Figure 3]
A perspective view showing the overall configuration of a lower body structure of an automobile according to an embodiment of the present invention.

FIG. 4 is a plan view schematically showing the structure of the lower body structure of an automobile according to an embodiment of the present invention.

[Fig. 5] A plan view schematically showing the configuration of an example of the lower body structure of a conventional automobile.

[Explanation of symbols]

1 Vehicle body 2a, 2b frame 3a, 3b Side sill 7 Connecting member 9,10 Gusset

Claims (2)

[Claims] Claim 1: A frame extending in the longitudinal direction of the vehicle body at an intermediate portion in the vehicle width direction of the lower portion of the vehicle body and having a bending portion bent in the vehicle width direction at the intermediate portion; A side sill extending in the longitudinal direction of the vehicle body, and a connecting member extending in the vehicle width direction between the side sill and the frame and connecting the side sill and a portion of the frame near the bent portion. A lower body structure for an automobile comprising: a gusset for connecting the frame and the connecting member on at least one of a front side and a rear side in the longitudinal direction of the vehicle body of a connecting portion of the connecting member with the frame; An automobile lower body structure characterized by: 2. A gusset for connecting the side sill and the connecting member is provided on at least one of the front side and the rear side in the longitudinal direction of the vehicle body of the connecting portion of the connecting member with the side sill. The lower body structure of a motor vehicle according to claim 1.