JP3478146B2 - Suspension mounting structure - Google Patents

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 suspension mounting portion of an automobile or the like.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a structure of a conventional suspension mounting portion, and 1 denotes a rear side member which is a frame member in the vehicle longitudinal direction.

Reference numeral 2 denotes the rear side member 1 and a sill inner 10 of a side sill 10 which is a skeleton-constituting member of a vehicle side portion.
a shows an outrigger extending over the
The flange 2a is joined to the lower surface of the rear side member 1, and the flange 2b is joined to the side surface of the side sill (not shown).

Reference numeral 3 denotes a reinforcement which is joined to the rear side member 1 and the outrigger 2 in a straddling manner. The outrigger 2 and the reinforcement 3 form a closed cross-section portion 13.

A weld nut 5 having a sleeve 5a joined by projection welding P or the like is provided on the upper surface 13b of the closed cross section 13, and the closed cross section 1 is also provided.
Inside the 3, a collar 12 whose upper end is joined to the lower side of the upper surface 13b of the closed cross section 13 by arc welding A or the like is provided.

Reference numeral 4 denotes a suspension bracket. The suspension bracket 4 is provided on the upper surface 13b of the closed cross section 13 by inserting the bolt 6 from the lower side of the vehicle into the collar 12 provided on the closed cross section 13. Further, by being fastened with the weld nut 5, it is fixed to the lower surface of the outrigger 2 below the closed cross section 13.

[0007]

According to the above-mentioned conventional structure, since the weld nut 5 and the collar 12 are provided separately, not only the number of working steps is increased, but also the lower surface 13a of the closed section 13 which is a suspension mounting surface. However, there is a problem in that it is difficult to align the weld nut 5 and the collar 12 with each other and the dimensions, and it is difficult to obtain the accuracy of the mounting surface.

Also, the suspension mounting surface 13
Since the span from “a” to the screwing point 5c of the weld nut 5 is long and the moment of suspension input applied to this screwing point is large, the bolt 6 does not loosen at the screwing point. Met.

In addition, since the structure depends on the upper surface 13b of the closed cross section 13 for the vertical input of the suspension, it is necessary to increase the thickness of the outrigger 2 in order to improve the suspension support rigidity. However, there was a problem that the weight and cost increased.

Also, at the lower end of the collar 12, since the contact area between the outrigger 2 and the lower end of the collar 12 is small, it is necessary to take measures to reinforce the contact surface such as increasing the plate thickness of the outrigger 2 in order to increase the support rigidity. From this point as well, there is a problem that the weight and the cost increase.

On the other hand, as shown in FIG. 5, the lower end of the weld nut 5 is extended downward, the collar 5b is formed integrally with the weld nut 5, and the sleeve 5a of the weld nut 5 is closed. By providing the upper surface 13b of 13 by being joined by projection welding P or the like, the lower surface 13a of the closed cross section 13 which is the suspension mounting surface,
There is also known a structure in which the position and size of the weld nut 5 and the collar 12 are easily adjusted to improve the mounting surface accuracy.

However, even in this structure, the collar 5b
Has a long span from the lower end of the weld nut 5 to the screwing point of the weld nut 5, and means for suppressing the influence of the moment from the suspension input on the screwing point is necessary, and the vertical input of the suspension is closed. The structure depends on the upper surface 13b of 13 and the contact area between the lower end of the collar 5b and the outrigger 2 at the lower end of the collar 5b is invariable, and the weight increase and cost increase due to measures such as panel reinforcement. The problem of doing it remained.

Therefore, the present invention provides a structure of a suspension mounting portion which can achieve both weight reduction of a vehicle and improvement of suspension support rigidity.

[0014]

In the claim 1 Means for Solving the Problems], on the lower side of the closed-section portion formed in the vehicle frame member, the structure for mounting a suspension bracket, the closed section
The parts are the rear side member and the side seat, which are the vehicle frame members.
And an outrigger that spans between the
Formed with rear side members and reinforcements
And, wherein a sleeve joined to the bottom surface of the closed cross-section portion, and extend upwardly of the sleeve is <br/> through the insertion hole of the upper surface of the closed-section portion, of the closed-section portion at the insertion hole around A weld nut having a collar joined to an upper surface is provided, and the suspension nut is fixed to the lower side of the closed cross section by a bolt inserted from the weld nut and the lower side of the closed cross section. There is.

A second aspect of the present invention is characterized in that the weld nut and the bolt according to the first aspect are screwed, fastened and fixed near the bottom surface of the closed cross section.

[0016]

[0017]

According to the first aspect of the present invention, the sleeve joined to the bottom surface of the closed cross section, and the sleeve extending around the sleeve and penetrating through the insertion hole on the upper surface of the closed cross section are provided around the insertion hole. And a weld nut having a collar joined to the upper surface of the closed cross section, and the suspension nut is fixed to the lower side of the closed cross section by a bolt inserted from the weld nut and the lower side of the closed cross section. Therefore, by the sleeve joined to the bottom surface of the closed cross section,
The contact area between the lower end of the weld nut and the bottom surface of the closed cross section can be made large, and the vertical input of the suspension is supported on both the upper surface where the collar is joined and the bottom surface where the sleeve is joined. Therefore, it is possible to suppress an increase in weight and cost due to the reinforcement, and to achieve both weight reduction and improvement in suspension support rigidity.

Further, since the weld nut is formed integrally with the collar and the sleeve, and the upper surface of the closed cross-section is arranged so as to penetrate therethrough, the upper end of the weld nut is joined to the weld nut. The lower surface of the cross section,
The weld nut and collar can be easily aligned and dimensioned, and the workability of installation can be improved significantly. In addition, the closed cross section is the rear frame that is the vehicle frame member.
Outriggers straddled between member and side sill
And the relay installed between the outrigger and the rear side member.
Because it is formed with force,
The input from these is reliably transmitted to the vehicle frame member, and the support rigidity is increased.
You can

According to the second aspect, in addition to the effect of the first aspect, the weld nut and the bolt are screwed in the vicinity of the bottom surface of the closed cross section to be fastened and fixed.
The span from the suspension mounting surface to the screw fastening point can be shortened, and thus the influence of the moment due to the suspension input on the screw fastening point can be reduced.

[0020]

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

1 to 3, reference numeral 1 denotes a rear side member having a substantially hat-shaped cross section which is a skeleton member in the vehicle front-rear direction. The rear side member 1 has its flanges 1a and 1a joined to the bottom surface of a floor panel 15. .

Reference numeral 2 denotes an outrigger which is laid across the rear side member 1 and a sill inner 10a which is a constituent member of a side sill 10 which is a skeleton constituent member of a vehicle side portion.

The outrigger 2 is a flange 2a at the inner end.
The upper surface is joined to the lower surface of the rear side member 1, the outer surface of the flange 2b at the outer end is joined to the side surface of the side sill 10, and the flanges 2c, 2c are joined to the lower surface of the floor panel 15.

Reference numeral 3 denotes a reinforcement which is joined to the rear side member 1 and the outrigger 2 so that the side wall 3a of the reinforcement 3 is joined to the side surface of the rear side member 1, and the flanges 3b and 3b and the lower surface 3 are joined together.
C is joined to the bottom surface 13a of the outrigger 2.

A projection is formed on the reinforcement 3 at a position where a weld nut 5 for fastening and fixing a suspension bracket 4 to be described later is formed. By assembling the outrigger 2 and the reinforcement 3, a weld is formed. A closed cross section 13 is formed at the position where the nut 5 is arranged.

Reference numeral 5 denotes a weld nut in which a sleeve 5a and a collar 5b are integrally formed. The weld nut 5 has its lower end sleeve 5a joined to the closed cross-section bottom surface 13a by projection welding P or the like, and the sleeve 5a.
The upper end of the collar 5b extending above the closed cross section 13
The upper surface 13b is penetrated through the insertion hole 9 and is joined and fixed by arc welding A or the like in the portion around the insertion hole 9.

Therefore, the specific mounting of the suspension bracket 4 is performed by disposing the suspension bracket 4 on the lower surface of the outrigger 2 below the closed section.
Bolts 6 are fastened and fixed to the weld nuts 5 provided at a plurality of positions in the closed cross section 13 from below the vehicle.

In particular, in this embodiment, the weld nut 5 and the bolt 6 are screwed together near the bottom surface 13a of the closed cross section 13.

As shown by 3 in the drawing, below the rear side member 1, a sleeve 7a is joined by projection welding P or the like inside the closed cross section formed by the rear side member 1, the outrigger 2 and the reinforcement 3. A weld nut 7 is provided, and a bolt 8 is inserted and fastened from below the vehicle to fix the suspension bracket 4.

FIG. 2 is a plan view showing the positions of the main parts of the vehicle of the present invention, and 11 is a rear tire.

According to the structure of the above embodiment, the sleeve 5a joined to the bottom surface 13a of the closed cross section 13 and the sleeve 5a extending above the sleeve 5 and penetrating from the insertion hole 9 of the upper surface 13b of the closed cross section 13 are inserted. The upper end of the closed cross section 13
Is provided with a weld nut 5 having a collar 5b joined to the upper surface 13b of the above, and the suspension bracket 4 is fixed to the lower side of the closed cross section 13 by a bolt 6 inserted from the lower side of the closed cross section 13. Therefore, by the sleeve 5a joined to the bottom surface 13a of the closed cross section 13,
Since the contact area between the lower end of the weld nut 5 and the bottom surface 13a of the closed cross section 13 can be increased,
It is possible to suppress an increase in weight and cost due to the reinforcement of the outrigger 2 panel, and achieve both weight reduction and suspension support rigidity.

Further, since the vertical input of the suspension can be supported by both the upper surface 13b to which the upper end portion of the collar 5b is joined and the bottom surface 13a to which the sleeve 5a is joined, the weight of the reinforcement 2 due to panel reinforcement and the like. The increase in cost can be suppressed, and the weight reduction and the support rigidity of the suspension can be more advantageously obtained.

In addition, the weld nut 5 is formed integrally with the collar 5b and the sleeve 5a, and the collar 5b is formed.
Of the closed cross section 13 upper surface 13b.
Since it is arranged so as to pass through from the insertion hole 9 and is joined around the insertion hole 9, it is possible to align the lower surface of the closed cross-section portion 13 which is the suspension mounting surface and the collar 5b of the weld nut 5 with each other. It becomes easy and the mounting workability can be remarkably improved.

Particularly in this embodiment, when the suspension bracket 4 is attached, the weld nut 5 and the bolt 6 are attached.
And are screwed in the vicinity of the bottom surface 13a of the closed cross-section portion 13, and are fastened,
Since it is fixed, the span from the suspension mounting surface 13a to the screwing point 5c can be shortened,
Therefore, it is possible to reduce the influence of the moment due to the suspension input on the screwing point.

The closed cross section 13 is composed of an outrigger 2 extending between the rear side member 1 and the side sill 10, which are vehicle frame members, and a reinforcement 3 extending over the outrigger 2 and the rear side member 1. Since it is formed, the input from the suspension (not shown) can be reliably transmitted to these vehicle frame members, and the support rigidity can be increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view showing a position of a main part of the present invention in a vehicle.

FIG. 3 is an explanatory cross-sectional view taken along line XX of FIG.

FIG. 4 is a sectional explanatory view of a conventional structure corresponding to FIG.

FIG. 5 is a cross-sectional explanatory view corresponding to FIG. 3 of a different conventional structure.

[Explanation of symbols]

1 Rear side member 2 Outrigger 3 reinforcement 4 suspension bracket 5 Weld nut 5a sleeve 5b color 6 bolts 10 side sills 13 Closed section 13a bottom 13b upper surface

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B62D 21/00 B60G 7/00

Claims (2)

(57) [Claims] 1. A structure in which a suspension bracket is attached to a lower side of a closed cross section formed on a vehicle frame member, wherein the closed cross section is a vehicle frame member.
And the side sill, and the outrigger that straddles the
Reinforce over the trigger and rear side member
Formed by the scan, the a sleeve joined to the bottom surface of the closed cross-section portion, and extend upwardly of the sleeve is penetrated from the insertion hole of the upper surface of the closed-section portion, of the closed-section portion at the insertion hole around A weld nut having an upper surface and a collar joined to the upper surface is provided, and the suspension bracket is fixed to the lower side of the closed cross section by the weld nut and a bolt inserted from the lower side of the closed cross section. Suspension mounting structure. 2. The weld nut and the bolt,
The suspension mounting portion structure according to claim 1, wherein the suspension mounting portion structure is configured to be screwed, fastened, and fixed in the vicinity of the bottom surface of the closed cross-section portion.