JPH09315338A - Structure of front body of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a front body of an automobile wherein a front side member can be deformed with a load from the front and the whole weight can be suppressed. SOLUTION: There is provided a front body structure wherein a connected parts 26 and 27 of a suspension arm 20 is supported with a suspension member 22 and a suspension member is supported with a front side member 24 which can be deformed when a predetermined load is applied. The suspension arm has a front connection part 34 for connecting a connected end part of the suspension arm in a swingable manner, a rear connection part 37, and a front support part 36 for connecting the suspension member to the front side member. The rear support part can be deformed with respect to the rear connection part when a predetermined load is applied to the front side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a front body of an automobile, and more particularly to a front side member which is deformable when an impact load from the front which is larger than a normal load is applied, and a suspension member connected to the front side member. And a front body structure of an FF vehicle including a suspension arm connected to the suspension member.

[0002]

2. Description of the Related Art The two connected end portions of a suspension arm having a front connected end portion and a rear connected end portion are connected to respective side portions of a suspension member located in a body width direction, In a front body of an automobile in which each side portion of a suspension member is connected to a front side member by a front support portion and a rear support portion, the front side member is formed so that it can be deformed by an impact load from the front or more. , There is a structure in which a rear end of a suspension arm and a rear support of a suspension member are vertically overlapped with each other and releasably connected to a front side member by using a common connecting means (Japanese Patent Laid-Open Publication No. 6-61600). 329045 publication).

In this structure, when an impact load of a predetermined amount or more is applied to the front side member, the front side member is deformed to absorb impact energy, and further, the range in which the front side member can be deformed without restraint by the connecting means. To increase energy absorption.

[0004]

In the front body, when an impact load of a predetermined amount or more is applied, the front side member is deformed to absorb energy.
The front side member has a first rigidity large enough to be deformed by an impact load. On the other hand, since the connecting means releases the connection due to the impact load, the front side member has the second rigidity of a size that is not deformed by the impact load at the portion behind the portion to which the connecting means is connected. Have. Since it is necessary for the same front side member to have two different rigidity in this way, the front side member behind the portion to which the connecting means is connected has a large cross-sectional shape or is welded with a reinforcing material. Therefore, it is necessary to take measures to prevent the increase in weight.

The present invention provides a structure of a front body of an automobile, in which the front side member can be deformed by a load from the front side and the overall weight increase can be suppressed.

[0006]

According to the present invention, the two connected ends of a suspension arm having a front connected end and a rear connected end are located in the body width direction of a suspension member. A front body structure of an automobile, in which each side portion is supported, and each side portion of the suspension member is supported by a front side member that is deformable when a predetermined load or more is applied from the front. The suspension member has, on each side, a front connecting portion and a rear connecting portion that swingably connect the front and rear connected ends of the suspension arm, respectively, and
Each side portion has a front support portion and a rear support portion that connect the suspension member to the front side member. The rear supporting portion is formed independently of the rear connecting portion and is deformable with respect to the rear connecting portion when a load larger than a predetermined amount is applied to the front side member from the front side.

[0007]

[Operations and Effects] When a load larger than a predetermined amount is applied to the front side member from the front and at the same time applied to the suspension member via the engine and the transmission, the front support portion and the rear support portion of the suspension member approach each other. The front side member deforms and absorbs impact energy.

Impact energy can be absorbed by the deformation of the front side member. When the front side member is deformed, the support portion in front of the suspension member is displaced rearward together with the front side member, and accordingly, the suspension arm having large rigidity is displaced substantially in parallel without being deformed. The displacement of the suspension arm causes the rear support of the suspension member to deform relative to the rear connection, so even if the rigidity of each part of the front side member is kept substantially the same, The member can be surely deformed, and the increase in weight can be suppressed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A structure of a front body of an automobile having a suspension arm, a suspension member supporting the suspension arm, and a front side member supporting the suspension member. The suspension arm is an integral type having a substantially L-shaped or A-shaped planar shape, and has a large rigidity. On the other hand, the suspension member has a load from the suspension arm, a load from the steering gear box,
It has rigidity to withstand normal loads such as the load from the engine mount and the jack-up load for lifting the vehicle body. The rear supporting portion of the suspension member is formed so as to be deformable with respect to the rear connecting portion of the suspension member when a load larger than a predetermined value is applied to the front side member from the front. The suspension member and the front side member can be formed so as to be hollow, for example, by laminating two plate materials and welding them. The front side member is deformable when a load larger than a predetermined amount is applied from the front side, and in a side view, a front portion, a rear portion located below the front portion, and a connection that obliquely connects the front portion and the rear portion. And a front support part of the suspension member is connected to the front part, and a rear support part of the suspension member is connected to a transition region between the rear part and the connection part.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the front body is shown in FIG. 1 in which the right side portion of the first embodiment (for the traveling direction of the automobile; the same applies hereinafter) is disassembled and seen from the left front, 2 of the left side of the vehicle viewed from the left front, and FIG. 4 of the attached state viewed from the side.
With reference to, the suspension arm 20 and the suspension member 2 that supports the suspension arm 20.
2 and a front side member 24 that supports the suspension member 22.

The suspension arm 20 is integrally formed so that the plane shape thereof is substantially L-shaped.
A front connected portion 26 and a rear connected portion 27 are provided at front and rear intervals. The suspension arm 20 supports the wheels via a carrier (not shown).

As shown in the sectional view of FIG. 3, the suspension member 22 is formed so that two plate members 30 and 32 are bent into a so-called hat shape and their respective flanges are overlapped and welded to each other so as to be hollow. Is. The suspension members 22 are formed independently of each other, and are located on each side portion in the body width direction. The front connecting portion 34, the rear connecting portion 35, the front supporting portion 36, and the rear supporting portion 37.
And The connected portion 26 at the front of the suspension arm 20 is connected to the connecting portion 34 at the front by a bolt 40 (FIG. 4) extending in the front-rear direction of the body, and the connected portion 27 at the rear of the suspension arm 20 extends in the vertical direction. It is connected to the rear connecting portion 35 by (FIG. 5). The front connected portion 26 is a bush (not shown)
Also, the rear connected part 27 has a bush 28 (FIG. 5), and these connected parts 26 and 27 swing around the horizontal axis with respect to the suspension member 22 within the range of the deflection of the bush. It is possible.

The front support member 36 and the rear support member 37 of the suspension member 22 are connected to the front side member 24.
Linked to The rear supporting portion 37 is deformable with respect to the rear connecting portion 35 when a load larger than a predetermined amount is applied to the front side member 24 from the front. In other words, the rigidity of the rear support portion 37 in the body front-rear direction is smaller than the rigidity of the rear connecting portion 35 in the body front-rear direction. As shown in FIG. 3, the rear support portion 37 is a plate member 3 having a hat shape.
The flange of No. 8 and the edge of the flat plate member 39 are overlapped with the flanges of the plate members 30 and 32 of the suspension member 22 by spot welding or arc welding, and the connecting portion 3
It is provided on the suspension member 22 in a form independent from the position 5, and is located below the rear connecting portion 35. The front support portion 36 and the rear support portion 37 of the suspension member 22 are located above the rear support portion 37 so that the front support portion 36 is fitted to the portion of the front side member 24 to be connected. .

The front side members 24 are provided on the body at each side portion in the width direction of the body in order to secure rigidity of the body mainly in the front-rear direction. The front side member 24 is formed by two plate members and has a closed cross-section structure. The rigidity of the front side member 24 in the front-rear direction is set to be deformable when a load larger than a predetermined value is applied to the front side member 24 from the front side, and this deformation absorbs impact energy. The predetermined load is, for example,
When a car traveling at 55km / h hits a wall, it can be sized to be the same as the load exerted by the wall.
As shown in FIG. 4, the front side member 24 has a front portion 44, a rear portion 45 below the front portion 44, and an oblique connecting portion 46 that connects the front portion 44 and the rear portion 45. In the transition area between the engine room 50 and the vehicle compartment 52, there is a large bend. The suspension arm 20 and the suspension member 22 are the front side member 2
4 below and to the side of the transition zone.

In the illustrated embodiment, a mounting seat 47 projecting downward is provided at the front portion 44 of the front side member 24, and a mounting seat 48 is provided at the transition region between the rear portion 45 and the connecting portion 46. There is. The front support portion 36 of the suspension member 22 is screwed to the mounting seat 47 with a bolt 54, and the rear support portion 37 is screwed to the mounting seat 48 with a bolt 56. As shown in FIG. 5A, a cylindrical spacer 58 is interposed in the portion of the support portion 37 through which the bolt 56 penetrates, and the bolt 56 is screwed into the nut 57 fixed to the mounting seat 48. Mounting seat 47 of the support portion 36
Do the same for the installation. The bolt 56 is located at the center of the front side member 24 in the body width direction. On the other hand, the bolt 42 that connects the connected portion 27 of the suspension arm to the connecting portion 35 of the suspension member is
As shown in FIG. 5B, the front side member 24
Is located inward in the body width direction, and the connecting portion 35 is located below the front side member 24.

In the embodiment shown in FIG. 4, a dash panel 60 is provided at a connecting portion between the connected portion 27 on the rear side of the suspension arm 20 and the connecting portion 35 of the suspension member 22.
It is located in the vicinity of the floor 62 and slightly below the floor 62. Therefore, the front side member 24
Even if the connecting portion is moved rearward due to the impact load A applied to the suspension member 22 and the impact load B applied to the suspension member 22 from the engine or the transmission 64,
Dash panel 60 by suspension arm 20
There is no risk of deforming the floor 62.

Next, the operation of the structure of the front body according to the present invention will be described with reference to FIG. 6 showing the positional relationship among the suspension arm 20, the suspension member 22, and the front side member 24. In the figure, a cross line is inserted in the support portion 37 at the rear of the suspension member 22 for convenience of description.

Before the load of a predetermined amount or more is applied (a), the supporting portion 36 and the connecting portion 34 are in the regular positional relationship, the supporting portion 37 and the connecting portion 35 are in the regular positional relationship, and the suspension arm 20 The front surface of is at the reference position B. When a predetermined load F is applied to the front side member 24 from the front (b), the front side member 24 is deformed.
At this time, the support portion 3 in front of the suspension member 22
6 is displaced rearward together with the front side member 24,
Along with this, the suspension arm 20 having large rigidity is displaced rearward in parallel, and the suspension arm 20
The front surface of is separated from the reference position B rearward by a distance L. Since the suspension arm 20 is displaced rearward in parallel without being substantially deformed, the connected portion 27 at the rear of the suspension arm 20 is also displaced rearward by the distance L, and the connecting portion 35 of the suspension member 22 is connected to the connected portion 27. The distance L is displaced together. As a result, the suspension member 2
The support portion 37 on the rear side of 2 receives a pulling force from the front side member 24 and the rear connecting portion 35, and the connecting portion 35
Transforms against. On the other hand, the connected portion 27 behind the suspension arm 20 that is displaced in parallel enters under the floor.

The above-described actions and effects can be obtained by the configurations shown in FIGS. 7 to 9. In these figures, parts having substantially the same structure are designated by the same reference numerals. Therefore, detailed description is omitted.

The suspension arm 70 of FIG. 7 has a front connected portion 26 and a rear connected portion 71. On the other hand, the suspension member 72 is connected to the front connecting portion 34,
It has a rear connecting portion 35, a front supporting portion 36, and a rear supporting portion 73. In the embodiment of FIG. 2, the rear support 3
As a result of 7 being located below the suspension arm 20, the rear connected portion 27 is obliquely above the front connected portion 26. On the other hand, in the embodiment of FIG. 7, the rear support portion 73 is located above the suspension arm 70.

The suspension arm 80 shown in FIG. 8 has a front connected portion 26 and a rear connected portion 81. On the other hand, the suspension member 82 is connected to the front connecting portion 34,
It has a rear connecting portion 83, a front supporting portion 36, and a rear supporting portion 37. In the embodiment of FIG. 2, the connected portion 27 on the rear side of the suspension arm 20 is connected to the connecting portion 35 of the suspension member 22 by a bolt extending in the vertical direction. On the other hand, in the embodiment shown in FIG. 8, the rear connected portion 81 is a shaft extending in the front-back direction of the body. The shaft 81 is connected to the connecting portion 83 by a bearing 84 having a semi-cylindrical bearing portion. Suspension member 82
The support portion 37 at the rear of is located below the suspension arm 80. The height of the connecting portion 83 is low, and the shaft 81 is arranged above the connecting portion 83 and connected.

The suspension arm 20 of FIG. 9 has a front connected portion 26 and a rear connected portion 27, and is the same as the suspension arm of FIG. On the other hand, the suspension member 92 has a front connecting portion 34 and a rear connecting portion 9
3, a front support portion 36, and a rear support portion 94. In the embodiment of FIG. 2, the rear connecting portion 35 and the rear supporting portion 37 of the suspension member 22 are formed in separate cross-sections by separate plate members. On the other hand, in the embodiment of FIG. 9, the plate member 95 on the bottom side of the connecting portion 93 is formed.
Is common to the connecting portion 93 and the supporting portion 94, and
The support portion 94 and the support portion 94 are formed in a closed cross-section structure by using a common plate material 95. In this embodiment, when a load larger than a predetermined value is applied to the front side member from the front, the rear support portion 94 is deformed with respect to the connecting portion 93.
A crack 96 occurs in the plate material 95 as shown by an arrow C. The generation of the crack 96 can also absorb energy.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the structure of a front body of an automobile according to the present invention, in which the right side portion is viewed from the front left side.

FIG. 2 is a perspective view of an embodiment of a structure of a front body of an automobile according to the present invention, in which the left side portion is viewed from the front left side.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a side view of a vehicle having a structure of a vehicle front body according to the present invention, in which only a brake booster is shown in an engine room.

5 is a cross-sectional view of the portion shown in FIG. 4, (a) being taken along the line 5a-5a in FIG. 4, and (b) being 5 in FIG.
It is cut along the line b-5b.

FIG. 6 is a plan view showing the operation of the present invention, in which (a) shows a state before deformation and (b) shows a state after deformation.

7A and 7B show another embodiment of the structure of the front body of an automobile according to the present invention, in which FIG. 7A is a perspective view similar to FIG. 2, and FIG. FIG.

8A and 8B show still another embodiment of the structure of the front body of an automobile according to the present invention, wherein FIG. 8A is a perspective view similar to FIG. 2, and FIG. 8B is a bb line of FIG. 8A. It is sectional drawing cut.

9A and 9B show still another embodiment of the structure of the front body of the motor vehicle according to the present invention, wherein FIG. 9A is a perspective view similar to FIG. 2, FIG. 9B is a plan view of a main part, and FIG. Is a plan view of an essential part showing the action, and (d) is a cross-sectional view taken along line dd of (b).

[Explanation of symbols]

 20, 70, 80 Suspension arm 22, 72, 82, 92 Suspension member 24 Front side member 26, 27, 71, 81 Connected portion 34, 35, 83, 93 Connecting portion 36, 37, 73, 94 Support portion

Claims (1)

[Claims] 1. The two connected ends of a suspension arm having a front connected end and a rear connected end are supported by respective side portions of a suspension member located in a body width direction, On each side of the suspension member,
A structure of a front body of an automobile, which is supported by a front side member that is deformable when a load larger than a predetermined amount is applied from the front, wherein the suspension member swings the front and rear connected ends of the suspension arm, respectively. Each side part has a front connecting part and a rear connecting part that are movably connected to each other, and a front supporting part and a rear supporting part that connect the suspension member to the front side member. And the rear support portion is formed independently of the rear connecting portion, and is deformable with respect to the rear connecting portion when a predetermined load or more is applied to the front side member from the front side. Is the structure of the front body of the car.