JPH0789459A - Car body structure for automobile - Google Patents

Abstract

PURPOSE:To provide a constitution by which a collision load or a load from a suspension can be absorbed without increasing car body weight sharply. CONSTITUTION:A nut plate 9 and a torque box reinforcement 15 are erected between a second suspension cross member 3 and a part in which a front side frame reinforcement 5 in a rear end part of a front side frame 1 is internally installed, and a closed cross-sectional structure A is composed of these four members. That is, thus closed cross-sectional structure and the front side frame 1 composed of a closed cross section are made adjacent vertically to each other. Thereby, rigidity of the rear end part of the front side frame 1 is improved, and absorptivity of a front collision load is improved, and a load inputted from a suspension is absorbed effectively by plural closed cross sections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body structure of an automobile, and more particularly to an improvement of a structure around a rear end portion of a front side frame.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No. 63-6488.
As disclosed in Japanese Patent Publication No. 3, a pair of left and right front side frames extending in the front-rear direction of the vehicle body are provided in the vehicle body front portion of the automobile as members for ensuring the rigidity of the vehicle body front portion. And this front side frame is
As disclosed in the above-mentioned publication, a reinforcement for reinforcement is provided inside the position near the rear end of the structure so that the rigidity of the rear part becomes particularly high. Thus, at the time of a frontal collision of the automobile, only the front portion of the automobile is buckled and deformed to absorb the collision load, and the influence of the collision load into the vehicle interior is suppressed. Also,
A suspension cross member (hereinafter referred to as a suspension cross member) is provided between the pair of left and right front side frames.
The suspension cross member supports one end of a suspension arm extending from the suspension. With such a configuration, the load input from the suspension arm is transmitted from the suspension cross member to the front side frame and is absorbed by the front side frame.

As described above, the front side frame is a member that is required to have high rigidity so as to absorb the collision load and the load input from the suspension as described above.

[0004]

However, when it is attempted to obtain high rigidity such that the front side frame can absorb the collision load and the load input from the suspension, the front side frame is not affected by the collision load. It is conceivable to separately provide a reinforcing member for absorbing the load and a reinforcing member for absorbing the load input from the suspension. However, in this case, as the number of parts by these reinforcing members increases, This is not preferable because the weight will be significantly increased and the weight of the vehicle body will be increased.

The present invention has been made in view of this point, and an object of the present invention is to obtain a structure capable of absorbing a collision load and a load from a suspension without causing a significant increase in vehicle body weight. .

[0006]

In order to achieve the above object, the present invention has a structure in which a front side frame and a suspension cross member are connected by a closed cross-section structure. Specifically, the invention according to claim 1 mounts a dash panel that constitutes a front wall of a passenger compartment at a position near a rear end portion of a front side frame that extends in the vehicle front-rear direction, and Install the reinforcing member at the position facing the attachment part of the dash panel. And below the front side frame,
A suspension support member that receives a suspension load is disposed, and the suspension support member and the front side frame are connected by a connection panel means that forms a closed cross section between the suspension support member and the front side frame. Further, one end of the connecting panel means is mounted at a position facing the mounting portion of the reinforcing member on the front side frame.

According to a second aspect of the present invention, in the vehicle body structure according to the first aspect, the mounting portion of the reinforcing member in the front side frame has a closed sectional structure, and the closed sectional structure is formed by the connecting panel means. The front side frame and the front side frame are arranged vertically adjacent to each other.

According to a third aspect of the present invention, in the vehicle body structure of the first or second aspect, the reinforcing member is provided with a vertical portion extending in the vertical direction, and the front side frame also extends in the vertical direction. Provide a vertical part. The vertical portion of the reinforcing member is superposed on and joined to the vertical portion of the front side frame while the upper end of the connecting panel means is joined to the vertical portion of the front side frame.

The invention according to claim 4 is the same as claim 1, 2 or 3.
Alternatively, in the vehicle body structure of the vehicle described in 3, the dash panel is connected to the front side frame and the reinforcing member, respectively.

[0010]

With the above construction, the present invention provides the following actions. According to the first aspect of the invention, not only the reinforcing member is attached to the position near the rear end portion of the front side frame, but also the connecting panel means forming a closed cross section between the suspension supporting member and the front side frame, Since the front side frame is mounted at a position facing the mounting portion of the reinforcing member, the rigidity of the rear end portion of the front side frame is particularly high. Only the front portion of the front side frame is buckled and deformed to absorb the collision load, and the influence of the collision load on the vehicle interior is suppressed. Further, the load input from the suspension during traveling of the vehicle is transmitted to the front side frame through the suspension supporting member and is absorbed by the front side frame. However, between the front side frame and the suspension supporting member, Since the closed cross section constituted by the connecting panel means is provided, the load is also absorbed by the closed cross section.

According to the second aspect of the present invention, the closed cross-section structural portion of the front side frame and the closed cross-section structural portion composed of the connecting panel means are adjacent to each other in the vertical direction.
The rigidity of the rear end portion of the front side frame is improved and the load input from the suspension is absorbed more effectively.

According to the third aspect of the invention, at the upper end portion of the connecting panel means, the connecting panel means, the vertical portion of the reinforcing member and the vertical portion of the front side frame are superposed and joined to each other. In the above, the three plate members are integrally laminated, and the load input from the suspension is smoothly transmitted to the highly rigid portion of the front side frame.

According to the fourth aspect of the invention, the dash panel is supported by the portion of the front side frame having high rigidity, and the supporting rigidity thereof is improved.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. In this example, a case will be described in which the configuration of the present invention is applied to a vehicle in which a floor surface is set at a relatively high position with a step at an entrance / exit for passengers. FIG. 1 is a perspective view of a front side frame 1 of a vehicle according to this example and its peripheral portion as viewed from the inside of an engine room, with a part omitted, and FIG. 2 is a step arrangement outside the front side frame 1. It is the perspective view which abbreviate | omitted one part which looked at the position periphery from the vehicle body side. As shown in FIG. 1, a vehicle body structure of a vehicle in this example includes a pair of left and right front side frames 1 extending in the vehicle front-rear direction in order to secure rigidity of a front portion of the vehicle.
The front first suspension cross member 2 (hereinafter referred to as the first suspension cross member 2) extending in the vehicle width direction so as to connect the front end portions and the rear end portions of the pair of left and right front side frames 1 to each other.
And a rear side second suspension cross member 3 (hereinafter referred to as a second suspension cross) as a suspension supporting member in the present invention. Each member will be described. The front side frame 1 is composed of a hat-shaped front side frame inner 1a and a front side frame outer 1b. Then, a rectangular closed cross section is formed therein. In addition, a flange portion 1c extending inward in the vehicle width direction from the upper end of the front side frame inner 1a and a front side frame are formed around the rear end of the front side frame 1 so that the front side frame 1 is opened upward. A flange portion 1d extending outward from the upper end of the outer 1b in the vehicle width direction is formed. Further, an inverted hat-shaped center frame 4 extending further rearward of the vehicle body is joined to a rear end edge portion of the front side frame 1. Further, a front side frame reinforcement 5 (hereinafter referred to as a front frame rain) as a reinforcing member according to the present invention is arranged inside the front side frame 1 at a position near a rear end thereof. As shown in FIG. 3, the front frame rain 5 has a U-shaped cross section that opens outward in the vehicle width direction.
The front half of a is on the upper surface inside the front side frame 1, the vertical surface portion 5b is on the vertical surface inside the front side frame 1 in the vehicle width direction, and the lower surface portion 5c is on the lower surface inside the front side frame 1. It is joined.
That is, the front frame rain 5 is arranged across the closed cross-section structure portion of the front side frame 1 and the open cross-section structure portion that is opened upward on the rear side of the closed cross-section structure portion. Therefore, the rigidity of the vicinity of the rear end of the front side frame 1 is improved. On the other hand, the first suspension cross 2 extends in the vehicle width direction below the front side frame 1 and is composed of a hat-shaped first suspension cross upper 2a and a first suspension cross lower 2b. The flange portions formed on the edges are joined to each other, and a rectangular closed cross section is formed inside the flange portions.
A bracket 6 is attached below the position of the front side frame 1 facing the outer end of the first suspension cloth 2 so as to hold both the inner and outer side surfaces of the front side frame 1. An end portion of the first suspension cloth 2 is fastened to the front side frame 1 by a fastening member 7 arranged so as to penetrate the upper and lower surfaces and the lower surface of the bracket 6. A fastening arm 2c extending forward of the vehicle body is provided on the front surface of the outer end of the first suspension cloth 2. This fastening arm 2
c is a closed cross-section structural member that is curved upward toward the front of the vehicle body, and its tip is in contact with the lower surface of the front side frame 1 near the front end portion. It is fastened to the front side frame 1 by a fastening member 8 arranged so as to penetrate the lower surface. As a result, the left and right ends of the first suspension cross 2 are firmly fastened to the front end portion of the front side frame 1.

Further, the second suspension cloth 3 is the first suspension described above.
Like the suspension cross 2, the front side frame 1
Of the second suspension cross upper 3a and the second suspension cross lower 3b, each of which is formed in a hat shape and extends in the vehicle width direction below, and the flange portions formed on the front and rear edges of each are joined to each other, It has a configuration in which a rectangular closed cross section is formed therein. An upper end of a nut plate 9 described later is joined to a position of the front side frame 1 facing the end of the second suspension cross 3, and the lower surface of the nut plate 9 is connected to the end of the second suspension cross 3. It is bolted (see Figure 5).
As a result, the left and right ends of the second suspension cross 3 are firmly fastened to the rear end of the front side frame 1. The configuration around the fastening portion of the second suspension cross 3 will be described later.

Reference numeral 10 in FIG. 1 denotes a suspension housing lower, the lower end portion of which is joined to the outer surface of the upper end flange portion of the front side frame 1 as shown in FIG. A suspension housing upper 11 is joined to the upper portion of the suspension housing lower 10,
The suspension housing upper 11 supports the upper end of a strut of a suspension (not shown). Furthermore,
A wheel apron 1 for forming a wheel house on both sides of the suspension housing lower 10 in the longitudinal direction of the vehicle body.
2, 12 are joined. A suspension arm of a suspension device (not shown) is connected to the first suspension cross 2 and the second suspension cross 3, and the thrust load of the suspension input from the suspension arm is the first suspension cross 2 and the second suspension cross 3. It is transmitted to the front side frame 1 via and is absorbed by the front side frame 1.

Next, the peripheral structure of the rear end portion of the front side frame 1 which characterizes the present vehicle body structure will be described. As shown in FIG. 5, a lower end portion of a dash panel 13 for partitioning an engine room and a vehicle compartment is joined to a front end portion of an open cross-section structure portion of the front side frame 1 which is open upward. More specifically, a mounting flange 13a is formed at the lower end of the dash panel 13, and the flange 13a is connected to the flange portions 1c and 1d of the open cross-section structure portion of the front side frame 1 which is open upward. The front frame rain 5 is joined to the upper surface 5a of the front frame rain 5 in a state of being mounted thereon, whereby the support rigidity of the dash panel 13 is improved. A floor panel 14 is mounted on the flanges 1c and 1d of the open side structure portion of the front side frame 1 and the upper surface 5a of the front frame rain 5 from above the flange 13a of the dash panel 13. This floor panel 1 is joined in the state
The reference numeral 4 extends toward the vehicle interior side at the rear of the vehicle body. That is, the open cross-section structure portion of the front side frame 1 having an open upper part constitutes a closed cross-section structure with the floor panel 14. Further, the dash panel 13 is provided at the upper edge of the dash panel 13.
The cowl panel 13b extending forward from the upper end of the dash panel 13 is joined, and the dash panel cross member 13c for reinforcing the upper edge of the dash panel 13 is joined.

The shape of the nut plate 9 connecting the second suspension cloth 3 and the front side frame 1 is as shown in FIGS. 2, 5 and 6.
A lower surface portion 9a, which is in contact with the upper surface of the second suspension cloth 3 and is bolted to the second suspension cloth 3, the lower surface portion 9
an inner vertical wall portion 9b bent upward from an inner end in the vehicle width direction of a, a front vertical wall portion 9c and a rear vertical wall portion 9d bent upward from both ends of the lower surface portion 9a in the vehicle front-rear direction. Has been. The nut plate 9 is arranged so as to face the position where the front frame rain 5 is arranged, and the upper end of the inner vertical wall portion 9b is located on the front and rear vertical wall portions 9c and 9d. It is located above the upper end, and the upper end of this inner vertical wall portion 9b is joined to the inner side surface as the vertical portion of the front side frame 1. That is, as shown in FIG. 6, at the upper end of the nut plate 9, the three members of the front frame rain 5, the front side frame inner la and the nut plate 9 are superposed and integrally joined. Become. Therefore, the load input from the suspension is smoothly transmitted to the highly rigid portion of the front side frame 1 via the nut plate 9. A flange portion 9e extending forward of the vehicle body is formed at an upper end of the front side vertical wall portion 9c, and a flange portion 9f extending rearward of the vehicle body is formed at an upper end of the rear side vertical wall portion 9d. , 9f are joined to the lower surface of the front side frame 1.

As one of the features of this embodiment, a tokule box reinforcement having a closed cross-section structure between the front side frame 1 and the nut plate 9 is provided on the vehicle width direction outer side of the float side frame 1. 15
(Hereinafter referred to as "torque box rain"). As shown in FIGS. 2 and 6, the shape of the torque box rain 15 is made of a plate material similar to the shape of the inner vertical wall portion 9b of the nut plate 9, and the lower end thereof extends to the outer side in the vehicle width direction. The flange portion 15a is also formed with side end flange portions 15b and 15c, which are also formed at respective side edge portions in the vehicle body front-rear direction and extend outward in the vehicle width direction. The torque box rain 15 is arranged at a position spaced from the inner vertical wall portion 9b of the nut plate 9 by a predetermined distance, and the lower end flange portion 15a thereof is superposed on the upper surface of the lower surface portion 9a of the nut plate 9. Are joined together, and each side end flange portion 15b, 15c
Are superposed and joined to the inner side surfaces of the front vertical wall portion 9c and the rear vertical wall portion 9d of the nut plate 9, respectively. The upper end of the torque box rain 15 is joined to the outer surface of the front side frame outer 1b. As a result, as shown in FIGS. 5 and 6, a box-shaped space A is formed which is closed by the three members of the front side frame 1, the nut plate 9 and the torque box rain 15. That is, with respect to the front side frame 1 having a closed cross-section structure reinforced by the front frame rain 5, the second suspension cross 3 is supported via the closed cross section A formed on the lower side of the front side frame 1. It will be. As a result, the nut plate 9 and the torque box rain 15 constitute a connecting panel means in the present invention.

A side sill 16 is arranged outside the torque box rain 15 in the vehicle width direction with a torque box B having a closed cross section interposed therebetween. More specifically, as shown in FIGS. 2 and 6, a torque box panel 17 is disposed outside the torque box rain 15, and the torque box panel 17, the floor panel 14, a step panel 18 described later, and The side sill 16 constitutes a torque box B having a closed cross section. Explaining each member, the torque box panel 17 will be described.
2 is a U-shape that is open upward in a side view as shown in FIG. 2, and includes a lower surface portion 17a, a front vertical wall portion 17b extending upward from a front end edge of the lower surface portion 17a, and a rear end of the lower surface portion 17a. A rear vertical wall portion 17c extending upward from the edge is provided, and flanges 17d to 17h are formed on the respective edge portions. As shown in FIG. 6, the inner edge of the lower surface portion 17a in the vehicle width direction is overlapped and joined to the lower side of the lower surface portion 9a of the nut plate 9. Therefore, in this portion, the lower end flange portion 15a of the torque box rain 15, the lower surface portion 9a of the nut plate 9 and the lower surface portion 17a of the torque box panel 17 are superposed on each other and integrally joined. The side sill 16 is composed of a side sill inner 16a and a side sill outer 16b, and flange portions formed on the upper and lower edges of each side sill are joined to each other, and a closed cross section is formed inside thereof. As shown in FIG. 7, a flange 17d at the outer edge in the vehicle width direction of the lower surface 17a of the torque box panel 17 is joined to the lower surface of the side sill inner 16a. In addition, as shown in FIG. 2 and FIG.
The front vertical wall portion 17b of the torque box panel 17 is
The side sill 16 is curved upward so as to follow the shape of the front pillar 16 ′ formed by being curved forward, and the flange 17 e formed on the outer edge portion in the vehicle width direction of the side sill 16 has a lower surface of the side sill inner 16 a and the front pillar. 16
It is joined over the front edge portion of ′. A flange 17f formed on the upper edge of the front vertical wall portion 17b of the torque box panel 17 is joined to the lower surface of the floor panel 14. Further, the vehicle width direction inner edge of the front vertical wall portion 17b of the torque box panel 17 is superposed and joined to the outer surface of the front vertical wall portion 9c of the nut plate 9. On the other hand, this torque box panel 17
The rear vertical wall portion 17c is formed along the shape of the step panel 18, and as shown in FIG. 9, the flange 17g formed at the outer edge portion in the vehicle width direction of the step panel 18 is formed. It is joined to the bottom surface. Further, the flange 17h formed at the upper edge of the rear vertical wall portion 17c of the torque box panel 17 is the floor panel 14
Is joined to the lower surface of. Further, the inner edge of the rear vertical wall portion 17c of the torque box panel 17 in the vehicle width direction is overlapped and joined to the outer surface of the rear vertical wall portion 9d of the nut plate 9. Meanwhile, the step panel 18
Is a plate member having a vertical cross section formed in an L shape when an occupant gets on and off the vehicle, and an upper end of the plate member is a lower surface of an outer edge portion in the vehicle width direction of the floor panel 14. And the lower end edge thereof is joined to the upper end surface of the side sill inner 16a (see FIG. 8).
In this way, the torque box panel 17, the floor panel 14, the step panel 18, and the side sill 16 constitute a torque box B having a closed cross section.

As an operation of the structure described above, first, in the event of a frontal collision of the vehicle, not only the front frame rain 5 is arranged inside the rear side frame 1 at the position near the rear end thereof, but also the front side Since the closed cross section A composed of the front side frame 1, the nut plate 9 and the torque box rain 15 is adjacent to the lower side of the front side frame 1 so as to face the position where the frame rain 5 is disposed, this front side frame 1 Since the rear part 1 has a particularly high rigidity, only the front part of the front side frame 1 can be buckled and deformed by the collision load to absorb the collision load, and the influence of the collision load into the vehicle interior is suppressed. It will be. Further, the load input from the suspension arm during traveling of the vehicle is transmitted from the suspension crosses 2 and 3 to the front side frame 1 and is absorbed by the front side frame 1, but as described above, Since the closed cross section A is arranged between the second suspension cross 3 and the second suspension cross 3, the load can be absorbed also by the closed cross section. Also, in particular, the front side frame 1 of the nut plate 9 and the torque box rain 15
Since the state of connection to is in the shearing direction via the load input from the suspension arm, the rigidity with respect to this load is ensured particularly high. Further, in such a load absorbing operation, since the closed cross section A and the closed cross section of the front side frame 1 are arranged vertically adjacent to each other, the rigidity of the rear end portion of the front side frame 1 is improved. Also, the load input from the suspension is effectively absorbed.

As described above, according to the structure of this embodiment, the front side frame 1 is provided with the reinforcing member for absorbing the collision load and the reinforcing member for absorbing the load input from the suspension. Since these loads can be effectively absorbed without any trouble, the collision load and the load from the suspension can be absorbed without causing a significant increase in the weight of the vehicle body.

In this example, the vehicle in which the floor surface is set at a relatively high position with a step at the entrance / exit of the occupant has been described. However, the present invention is not limited to this, and is not limited to a general passenger car. Can be adopted.

[0024]

As described above, according to the present invention, the following effects are exhibited. According to the invention described in claim 1, the suspension support member and the front side frame are connected by the connection panel means forming a closed cross section between the suspension support member and the front side frame, and one end of the connection panel means is connected. Since the portion is attached to a position facing the attaching portion of the reinforcing member in the front side frame,
The rigidity of the rear end of the front side frame can be made particularly high, so that the collision load at the time of a front collision of the vehicle can be effectively absorbed, and the influence of the collision load into the vehicle interior can be suppressed. Sometimes, the load input from the suspension can be effectively absorbed by the closed cross section formed by the connecting panel means, so that the front side frame absorbs the load input from the reinforcement member and the suspension to absorb the collision load. Since it is possible to effectively absorb these loads without separately providing the reinforcing members of the above, the collision load and the load from the suspension can be absorbed without significantly increasing the weight of the vehicle body. Can be absorbed.

According to the second aspect of the present invention, the mounting portion of the reinforcing member in the front side frame has a closed sectional structure, and the closed sectional structure formed by the connecting panel means and the front side frame are arranged in the vertical direction. Since they are arranged adjacent to each other, the rigidity of the rear end portion of the front side frame can be improved and the load input from the suspension can be absorbed more effectively.

According to the third aspect of the present invention, the reinforcing member is provided with the vertical portion extending in the vertical direction, and the front side frame is also provided with the vertical portion extending in the vertical direction, and the vertical portion of the reinforcing member is provided. Is joined to the vertical portion of the front side frame while being superposed on the vertical portion of the front side frame, and the upper end portion of the connecting panel means is joined to the vertical portion of the front side frame. Can be smoothly transmitted to a high portion, and the absorption performance of this load can be improved.

According to the fourth aspect of the invention, since the dash panel is connected to the front side frame and the reinforcing member respectively, it is possible to improve the support rigidity of the dash panel.

[Brief description of drawings]

FIG. 1 is a perspective view of a front side frame and its peripheral portion as viewed from the inside of an engine room with a part omitted.

FIG. 2 is a perspective view in which a part of the periphery of the step arrangement position outside the front side frame is viewed from the side of the vehicle body and is omitted.

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

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

5 is a sectional view taken along line VV in FIG.

FIG. 6 is a sectional view taken along line VI-VI in FIG.

7 is a sectional view taken along line VII-VII in FIG.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

9 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

1 Front Side Frame 3 Second Suspension Cross Member (Suspension Supporting Member) 5 Front Side Frame Reinforcement (Reinforcing Member) 5b Vertical Surface (Vertical) 9 Nut Plate (Connecting Panel Means) 13 Dash Panel 15 Torque Box Reinforcement (Connecting panel means)

Claims (4)

[Claims] 1. A dash panel forming a front wall of a vehicle compartment is attached to a position near a rear end of a front side frame extending in the vehicle front-rear direction, and the dash panel is attached to the front side frame. A reinforcing member is attached to a position facing the portion, a suspension supporting member for receiving a suspension load is arranged below the front side frame, and the suspension supporting member and the front side frame are separated from each other. The suspension support member and the front side frame are connected by a connecting panel means forming a closed cross section, and one end portion of the connecting panel means faces a mounting portion of the reinforcing member in the front side frame. Automatic characterized by being installed in position Body structure of. 2. The mounting portion of the reinforcing member in the front side frame has a closed cross section structure, and the closed cross section structure formed by the connecting panel means and the front side frame are arranged vertically adjacent to each other. The vehicle body structure for an automobile according to claim 1, wherein 3. The reinforcing member has a vertical portion extending in the vertical direction, and the front side frame also has a vertical portion extending in the vertical direction, and the vertical portion of the reinforcing member has a vertical portion of the front side frame. 3. The vehicle body structure for an automobile according to claim 1, wherein the connecting panel means has an upper end portion joined to a vertical portion of the front side frame while being overlapped and joined to the portion. 4. The vehicle body structure for an automobile according to claim 1, wherein the dash panel is connected to the front side frame and the reinforcing member, respectively.