JP2009083692A - Suspension member mounting structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent generation of a damage and a deformation of a mounting part against an input applied to a mounting part of a suspension member in traveling of a vehicle and in collision of the vehicle. <P>SOLUTION: In the suspension member mounting structure for a vehicle, a brace 3 of an approximately U shape cross section is provided on the side member 2 of the vehicle so as to be downwardly projected, and a terminal fixing part 10 of the suspension member 1 is superposed on a bottom wall 30 of the brace 3 and is fastened by a bolt member B. An outrigger 4 is laid between the side member 2 and a locker 5 positioned on an outdoor side than the side member 2, and end part on the side member 2 side of the outrigger 4 is bonded to the side member 2 while integrated with the brace 3. The input applied from the suspension member 1 to the brace 3 is also distributed to the locker 5 from the outrigger 4 with the side member 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a mounting structure for a suspension member that supports a suspension arm or the like of a vehicle, and more particularly, to a mounting structure for fastening a terminal fixing portion of a suspension member via a brace protruding downward on a side member.

As shown in FIGS. 8 and 9, conventionally, as a mounting structure of the suspension member 1 installed in the vehicle width direction at the lower part of the vehicle body, a pair of left and right extending in the front-rear direction has a closed cross-sectional structure with the passenger compartment floor F. A pair of left and right braces 3 and 3 projecting downward from the side members 2 and 2 are installed below the side members 2 and 2, respectively. These include a structure in which the left and right terminals of the suspension member 1 are attached by bolting from below.
Each brace 3, 3 has a cylindrical shape penetrating the end of the suspension member 1 in screw holes 31, 31 made of a cylindrical screw member that connects the bottom wall of the brace 3 and the bottom wall of the side members 2, 2 up and down. The bolt members B and B penetrating the bolt through holes 14 and 14 made of the collar member are fastened and fixed. In FIG. 9, 4 is the rear side of the brace 3 between the side member 2 and the outer side of the side member 2 between the side member 2 and a rocker (not shown) installed parallel to the lower side of the vehicle body. It is a built-in outrigger.

By the way, the brace installation parts of the side members 2 and 2 to which the braces 3 and 3 supporting the ends of the suspension member 1 and the bolt members B and B and the braces 3 and 3 are attached are input in the front-rear direction and the left-right direction from the suspension. Works. When these inputs repeatedly act, the bolt members B and B may be broken or the brace installation portions of the braces 3 and 3 and the side members 2 and 2 may be deformed.
For this reason, the bolt member B is thickened or the brace 3 and the side member 2 are thickened to increase the rigidity of the suspension member mounting portion. This is not an advantageous measure.

Further, in the device described in Patent Document 1 below, paying attention to the point that the suspension member is likely to vibrate because the distance between the mounting portions at both ends of the suspension member 1 is long, and as a countermeasure against vibration, A pair of left and right braces (mounting brackets) having a substantially L-shaped cross-section and a closed cross-section with the inner side wall of the side member and the passenger compartment floor are provided at positions, which are slightly shorter than the distance between the left and right side members. It has been proposed that both ends of the suspension member are fastened by a plurality (two) of bolt members.
Utility Model Registration No. 2520543

However, in the device described in Patent Document 1, the suspension member can be reduced in size and vibration can be reduced. However, in the event of a vehicle collision or the like, if a large impact in the front / rear / left / right direction acts on the suspension member mounting portion, The brace and the side member may be deformed, and the rigidity of the mounting portion of the suspension member cannot be said to be sufficient.
Accordingly, the present invention provides a suspension member mounting structure for a vehicle that reduces the load on the mounting portion of the suspension member and its peripheral members and prevents the occurrence of breakage and deformation with respect to front, rear, left and right inputs acting on the suspension member. It was made as an issue to achieve.

According to the present invention, a brace that is substantially U-shaped in cross section and that forms a closed cross section with the bottom wall of the side member and projects downward from the bottom wall is provided below the side member of the vehicle. In a suspension member mounting structure for a vehicle in which a suspension member end fixing portion for supporting a suspension arm or the like is overlapped on a wall and fastened by a bolt member, the side member is provided along the lower edge of the side surface of the vehicle body. An outrigger is installed between the rocker and the rocker located on the outer side of the vehicle, and the outrigger is connected to the side member integrally with the brace at the end on the side member side.
Since the outrigger installed between the side member and the rocker is coupled to the side member integrally with the brace, the rigidity of the mounting portion of the suspension member is enhanced. And since the input acting on the brace from the suspension member is transmitted to the outrigger together with the side member and distributed to the rocker, the burden on each input of these members is reduced, and these deformations are prevented without increasing the plate thickness. be able to.

The brace expands the front-rear width so that the rear end faces the front end of the rocker in the vehicle width direction. The brace and the terminal fixing portion of the suspension member are bolted at a plurality of front and rear positions. An end of the outrigger on the side member side is joined to the side member integrally with a rear end of the brace (Claim 2).
In the event of a frontal collision of the vehicle, the front and rear widths of the brace are expanded and a plurality of bolt members are fastened to the terminal fixing portion of the suspension member. The burden can be reduced. Further, since the rear end of the brace is opposed to the front end of the rocker in the vehicle width direction, it is possible to easily couple the both to the outrigger.

A height dimension of the outrigger is set to a dimension extending over the side member and the brace protruding downward from the side member. The upper half of the end of the outrigger is coupled to the side member and the lower half is coupled to the brace (Claim 3).
Thus, the outrigger is coupled to the side member integrally with the brace.

On the bottom wall of the brace, a stepped portion having a high front half is provided at an intermediate position in the front-rear direction, and a stepped portion corresponding to the stepped portion is also provided in the terminal fixing portion of the suspension member, and the two stepped portions are mutually connected It abuts (Claim 4).
Since the stepped portions of the brace and the suspension member are brought into contact with each other in the front-rear direction, relative movement in the front-rear direction is prevented in the event of a frontal collision of the vehicle, thereby further reducing the burden on each bolt member. it can.

The two stepped portions are formed on an inclined surface that rises forward.
At the time of a frontal collision of the vehicle, the rear part of the vehicle body rises obliquely upward, so that the relative movement of the brace and the suspension member can be reliably prevented by setting the abutting inclined surface as the upwardly inclined surface.

An embodiment in which the present invention is applied to a structure for attaching a front suspension member to a front side member installed in a front lower portion of a vehicle body such as a semi-bonnet type wagon vehicle will be described.
As shown in FIG. 1, a pair of parallel front side members (hereinafter simply referred to as side members) 2 and 2 extending in the front-rear direction and spaced apart from each other on the left and right sides are provided at the front lower portion of the vehicle body as body frame members. Both side members 2 and 2 have a front half extending to the engine room side and a rear half extending along the lower surface of the passenger compartment floor F, and a front suspension member (hereinafter simply referred to as a suspension member) in the front half. 1 is supported. In addition, left and right rockers 5 and 5 serving as skeleton members are provided on the left and right side edges of the passenger compartment floor F, the middle portions of the side members 2 and 2 between the front half and the rear half, and the front ends of the rockers 5 and 5. Are connected by the left and right outriggers 4 and 4 in the vehicle width direction. A front pillar 6 that stands upward is erected on the front ends of the lockers 5 and 5.

As shown in FIGS. 1 and 2, the suspension member 1 has a quadrangular frame shape in plan view, and supports a suspension arm (not shown) at both left and right ends, and supports an engine (not shown) at the center. It is.
The suspension member 1 is disposed at a position lower than the side members 2 and 2, and the suspension member 1 is provided with arm portions 11 that rise upward at the left and right ends of the front side, and the upper ends of both arm portions 11 are connected to the left and right side members. 2 and 2 are attached to the lower surfaces of the front half portions, and the rear end fixing portions 10 are attached to the braces 3 and 3 projecting downward from the intermediate portions of the side members 2 and 2, respectively.

Hereinafter, the detail of the attachment structure of the said terminal fixing | fixed part 10 of the suspension member 1 is demonstrated. The mounting structure is the same on the left and right, and one structure will be mainly described.
As shown in FIGS. 2, 3, and 4, the suspension member 1 has a closed cross-sectional structure with an upper panel 12 and a lower panel 13. The terminal fixing portion 10 on the rear side is provided with bolt through holes 14 and 14 that are provided with cylindrical collars in the front and rear portions and penetrate the upper and lower panels 12 and 13 in series.

  The side member 2 has a closed cross-sectional shape in which the front half has a square shape, and the rear half has an inverted hat shape in cross section, and the left and right upper edge flanges are coupled to the lower surface of the passenger compartment floor F and closed with the passenger compartment floor F. It constitutes a cross section.

  The brace 3 has a substantially U-shaped cross section, and is welded so that the lower ends of the side members 2 are sandwiched from the left and right sides at the upper edges of the left and right side walls, and closed with the bottom wall 20 of the side members 2. And is fixed so as to protrude downward from the side member 2. The front end of the brace 3 is closed by a front wall formed integrally with the brace 3.

As shown in FIGS. 2 to 5, the brace 3 of the present embodiment has a front-rear width that is larger than the conventional one, and the rear end of the brace 3 faces the front end of the rocker 5 in the vehicle width direction. It is set to the position to do.
The rear end of the brace 3 is integrally joined to the side member 2 and one end of the outrigger 4 that connects the side member 2 and the rocker 5 in the vehicle width direction.

  The locker 5 has a closed cross-section structure with the outer panel 51 and the inner panel 52, and is provided along the lower edge of the side surface of the vehicle body at a low position outside the vehicle of the side member 2. Further, the front pillar 6 standing from the front end of the rocker 5 has a closed cross-sectional structure with an outer panel 61 and an inner panel 62.

  The outrigger 4 is arranged along the vehicle width direction, and is installed in a direction orthogonal to the side member 2 and the rocker 5. The outrigger 4 has a substantially inverted hat shape in cross section, and the upper edge flange of the front wall and the rear wall is coupled to the lower surface of the passenger compartment floor F to form a closed cross section with the passenger compartment floor F. The height dimension of the outrigger 4 is a height from the locker 5 to the vehicle compartment floor F, and is set to be larger than the height of the side member 2.

The outrigger 4 has a front edge and a rear wall of the outer side edge flanges connected to the front end of the rocker 5 and the inner surface of the front pillar 6 on the inner side of the vehicle.
On the other hand, the inner edge of the outrigger 4 is set to have a height dimension approximately equal to the sum of the height dimension of the side member 2 and the height dimension of the brace 3 protruding downward.

  The outer edge of the outrigger 4 on the vehicle inner side is formed by welding the edge flange of the front wall in series along the outer surface of the side member 2 on the outer side of the vehicle and the outer surface of the outer side of the rear end of the brace 3. The inner edge of the rear wall of the rear wall of the outrigger 4 is welded to the outer flange of the side member 2 on the outer surface of the side member 2, and is provided on the lower half of the side member 2. 3 is welded to the rear edge of the brace 3 so that the rear edge of the brace 3 is closed.

  The bottom wall 30 of the brace 3 having an enlarged front-rear width is formed with through holes at two positions on the front and rear sides, and the lower end of a cylindrical screw member 32 is inserted into the brace 3 in correspondence with the through holes. Front and rear screw holes 31, 31 formed by being coupled around the hole and having the upper end coupled to the bottom wall 20 of the side member 2 are formed.

  The suspension member 1 has its terminal fixing part 10 superimposed on the bottom surface of the bottom wall 30 of the brace 3, and bolt members B and B penetrating the front and rear bolt through holes 14 and 14 of the terminal fixing part 10 from below are screw holes 31 of the brace 3. , 31 and fixed.

  In the present embodiment, the end member on the side member 2 side is joined to the side member 2 integrally with the brace 3 using the outrigger 4 installed between the side member 2 and the rocker 5. The rigidity of the part is strengthened. Since the input acting on the brace 3 from the suspension member 1 is distributed and transmitted to the outrigger 4 together with the side member 2, the burden on the input of the brace 3, the bolt member B, and the side member 2 is reduced. Damage and deformation due to input can be prevented without increasing the size and thickness.

  In particular, during a frontal collision of the vehicle, a large input acts on the mounting portion of the suspension member 1 to receive a strong impact. However, in this embodiment, the brace 3 is extended to a position where the rear end faces the front end of the rocker 5. In addition, the rear end of the brace 3 is connected to the front end of the rocker 5 by the outrigger 4, and the brace 3 is fastened to the terminal fixing portion 10 of the suspension member 1 at the two front and rear positions by the bolt members B and B. The burden on B and B is reduced and the occurrence of folding is prevented.

  Next, another embodiment of the present invention that is more effective against a large impact acting on the brace 3 at the time of a frontal collision of the vehicle will be described with reference to FIGS. The basic structure of the present embodiment is almost the same as that of the previous embodiment, and differences will be mainly described. In the drawings, the same members are denoted by the same reference numerals, and description thereof will be omitted.

On the bottom wall of the brace 3A used in the present embodiment, a step portion 35 having a front rising inclined surface with the front half 30a as a high position is formed at the front and rear intermediate positions of the front half 30a and the rear half 30b.
Correspondingly, a step portion 15 is also formed in the terminal fixing portion 10 of the suspension member 1. Then, the terminal fixing portion 10 is bolted to the brace 3A in a state where the step portion 15 of the terminal fixing portion 10 is overlapped and brought into contact with the step portion 35 of the brace 3A.

During a frontal collision of the vehicle, input in the front-rear direction is applied to the side member 2 and the suspension member 1, and a large input load is applied to the bolt members B and B that fasten the brace 3A and the terminal fixing portion 10 of the suspension member 1. Added. In the present embodiment, the step portions 35 and 15 are formed on the bottom wall of the overlapping brace 3A and the terminal fixing portion 10 of the suspension member 1, thereby preventing the relative movement therebetween, and further reducing the burden on the bolt members B and B. And breakage is prevented.
At the time of a frontal collision of the vehicle, the vehicle inclines in the direction in which the rear part is lifted. .

  Each of the above-described two embodiments is an embodiment in which the present invention is applied to a front suspension member mounting structure. However, the present invention is not limited thereto, and the present invention may be applied to a rear suspension member mounting structure.

1 is a schematic plan view showing an embodiment in which the present invention is applied to a mounting structure for a front suspension member of a vehicle. It is a principal part perspective view of the said attachment structure. It is sectional drawing in the position which follows the III-III line of FIG. It is sectional drawing in the position which follows the IV-IV line of FIG. It is sectional drawing in the position which follows the VV line of FIG. FIG. 6 is a schematic plan view of another embodiment in which the present invention is applied to a vehicle front suspension member mounting structure. It is sectional drawing in the position which follows the VII-VII line of FIG. It is a schematic sectional drawing which shows the conventional suspension member attachment structure. It is sectional drawing which follows the IX-IX line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Suspension member 10 Terminal fixing | fixed part 15 Step part 2 Side member 20 Bottom wall 3,3A Brace 30 Bottom wall 35 Step part 4 Outrigger 5 Rocker B Bolt member

Claims (5)

A brace is formed below the side member of the vehicle. The brace has a substantially U-shaped cross section, forms a closed cross section with the bottom wall of the side member, and projects downward from the bottom wall. A suspension arm is provided on the bottom wall of the brace. In the suspension member mounting structure for a vehicle in which the terminal fixing portions of the suspension members that support etc. are overlapped and fastened by bolt members,
An outrigger is installed between the side member and a rocker provided along the lower edge of the side surface of the vehicle body and located on the vehicle outer side than the side member. The outrigger has an end on the side member side and the brace. A suspension member mounting structure for a vehicle, wherein the suspension member is integrally coupled to the side member. The front and rear braces are enlarged in the front and rear direction so that the rear end faces the front end of the rocker in the vehicle width direction.
Bolt the brace and the terminal fixing part of the suspension member at the front and back at several locations,
The suspension member mounting structure for a vehicle according to claim 1, wherein an end portion of the outrigger on the side member side is coupled to the side member integrally with a rear end of the brace. A height dimension of the outrigger is set to a dimension across the side member and the brace protruding downward from the side member;
The suspension member mounting structure for a vehicle according to claim 1 or 2, wherein an upper half portion of an end portion of the outrigger is coupled to the side member and a lower half portion is coupled to the brace. The bottom wall of the brace is provided with a stepped portion having a front half portion at a middle position in the front-rear direction, and a stepped portion corresponding to the stepped portion is also provided at the terminal fixing portion of the suspension member.
The suspension member mounting structure for a vehicle according to claim 1 or 3, wherein the two step portions are brought into contact with each other.   The suspension member mounting structure for a vehicle according to claim 4, wherein the two stepped portions are formed in an upwardly inclined surface.

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