JP2589368Y2 - Rear suspension mounting structure of vehicle - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear suspension mounting structure for a vehicle.

[0002]

2. Description of the Related Art As shown in FIG. 4, a rear suspension of a vehicle includes a suspension arm which is pivotally mounted on a cross member of a vehicle body so as to be able to swing up and down, and a suspension tower b which is formed in a cylindrical shape on a part of a wheel apron a. Between the shock absorber c and the suspension spring d
And the suspension reaction force is applied to the shock absorber c.
And a suspension tower b, a wheel apron a forming the suspension tower, a side frame e fixed to the wheel apron, a rear pillar inner f and the like via a suspension spring d. (Eg, Japanese Utility Model Laid-Open No. 60-6)
No. 8875).

[0003]

The rear suspension mounting structure as described above has a problem that the projecting suspension tower b reduces the volume of the trunk room. The suspension tower has been abolished, and a shock absorber c and / or a suspension spring d have been interposed between the suspension arm and the lower surface of the side frame e. However, when such a configuration is adopted, the allowable expansion and contraction strokes of the shock absorber c and the suspension spring d are reduced by the side frame e.
Has to be limited by the protruding height below the floor surface, and a problem arises in that the allowable expansion / contraction stroke cannot be made too large.

If the sectional height of the side frame is partially reduced, the allowable expansion / contraction stroke of the shock absorber or suspension spring can be increased. However, if the sectional height of the side frame is reduced, the strength of the frame decreases. Occurs. That is, the side frame is fixed along the lower side edge of the floor to form a closed cross section in the front-rear direction. Since the vertical wall functions dominantly in the frame strength, the height of the vertical wall is partially reduced. If lowered, the strength and rigidity near the rear suspension mounting part will decrease,
This is not preferable in terms of measures against vibration noise and maneuverability.

An object of the present invention is to address the above-mentioned conventional problems.

[0006]

According to the present invention, a reinforcement (A) is provided in a side frame which is joined and fixed to a lower surface of a side edge of a floor to form a closed cross section in the front-rear direction so as to partition the closed cross section up and down. Is fixed to the lower surface of the floor, and both side ends are fixed to the side frame, and the cross member forming the closed cross section in the vehicle width direction is joined between the vicinity of the joint with the side frame and the lower surface of the floor. The side portion of the fixed reinforcement (B) is bonded and fixed to the above-mentioned reinforcement (A), and the suspension bracket is fitted in the closed cross section through the mounting hole of the suspension bracket provided on the lower surface of the side frame. The upper surface of the suspension bracket is overlapped and fixed to the joint fixing portion between the reinforcement (A) and the reinforcement (B), and the lower edge of the suspension bracket is attached to the periphery of the mounting hole on the lower surface of the side frame. By fixing overlapping the lower surface of the cross member constitutes a rear suspension attaching portion in section,
The upper end of a strut of a rear suspension is attached to the suspension bracket.

[0007]

As described above, using the reinforcement (A) for reinforcing the side frame and the reinforcement (B) for reinforcing the joint of the cross member to the side frame, the suspension load receiving surface of the rear suspension is used. The upper surface of the suspension bracket is fixedly bonded to the joint between the reinforcements (A) and (B) above the lower surface of the side frame, and the suspension load is dispersed to the side frame and the cross member. The allowable expansion and contraction stroke of the strut consisting of the shock absorber and the suspension spring can be made larger than before, and the side frame has the greatest effect on the frame strength. And the reinforcement (A) above it
(B) is firmly connected with a suspension bracket, and the suspension bracket functions as a reinforcing member near the periphery of the mounting hole, so that the strength and rigidity near the rear suspension mounting portion are significantly improved. And the operability can be improved.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

In the figure, 1 is a floor, 2 is a rear wheel apron, 3 is a side frame joined and fixed to the lower surface of the side edge of the floor 1 to form a closed cross section in the front-rear direction. Reinforcement (A) 4
Are fixed so as to partition the above-mentioned closed cross section up and down over the entire length, and a doubler 5 is joined and fixed to the inside of the lower surface of the side frame 3 so that the side frame 3 is reinforced. On the inner vertical wall of the side frame 3, a fitting fixing portion 31 of the cross member 6 described later is formed.

Reference numeral 6 denotes a cross member. The cross member 6 is joined and fixed to the lower surface of the floor 1 and both ends thereof are fitted and fixed to fitting fixing portions 31 of the left and right side frames 3 to be joined. The closed section in the front-rear direction formed by the frame 3 and the closed section in the vehicle width direction formed by the cross member 6 communicate with each other. 7 is a reinforcement (B), and the reinforcement (B)
Numeral 7 is sandwiched and fixed from the joint with the floor 1 near the end on the cross member 6 side to the joint with the fitting fixing part 31 and the joint with the floor 1 and the reinforcement (B) 7. The side portion of the side frame 3 extends into the side frame 3 and is bonded and fixed on the reinforcement (A) 4 of the side frame 3 and the side end portion is bonded and fixed to the outer vertical wall of the side frame 3. The strength of the joint between the frame 3 and the cross member 6 is improved.

A mounting portion for the rear suspension is formed in the intersection of the closed cross section in the front-rear direction formed by the side frame 3 and the closed cross section in the vehicle width direction formed by the cross member 6.

That is, as shown in FIG.
A mounting hole 32 for the suspension bracket 8 is provided on the lower surface of the side frame 3 (and the doubler 5 joined to the side frame 3) at the joint portion with the suspension frame 8, and the suspension bracket 8 is fitted inside the mounting hole 32, By fixing the bracket 8 to the peripheral portion of the mounting hole 32 and the reinforcement (A) 4 by spot welding or the like, the suspension is mounted below the reinforcement (A) 4 in the side frame 3. Unit.

More specifically, the suspension bracket 8
Is a substantially cylindrical or somewhat conically shaped substantially conical peripheral surface 8
1 has an outward flange 82 at the lower end thereof and has an upper surface 83 at the upper end of the peripheral surface 81. The upper surface 83 is provided with a reinforcement (A) 4 and a reinforcement (B) 7 joined thereto. And the outer flange 82 at the lower end is joined to the peripheral edge of the mounting hole 32 of the side frame 3, and the peripheral edge of the mounting hole 32 and the doubler 5 and the cross member 6 joined thereto. And fixed to the lower surface by spot welding. By attaching the upper end of a conventionally known strut 9 comprising a shock absorber 91 and a suspension spring 92 on the outer periphery of the suspension bracket 8 via a top mount rubber 93, the suspension load is reduced. And two reinforcements (A) 4 and reinforcements (B) 7 overlapping each other. A hole 83a is provided at the center of the upper surface 83 of the suspension bracket 8, and a hole 4a substantially corresponding to the hole 83a is also provided in the reinforcement (A) 4, and the upper end of the strut 9 is provided with the hole 83a, 4a can be projected upward. In the illustrated embodiment, the reinforcement (B) 7 has the hole 83 as shown in FIG.
a and 4a are formed so as to bypass the holes 83a and 4a. If the reinforcement (B) 7 is configured not to bypass the holes 83a and 4a, holes are provided in the reinforcement (B) 7 as well. And

As described above, the reinforcement (A) 4 fixed to the side frame 3 over its entire length so as to partition the closed cross section upward and downward for reinforcement of the side frame 3 and the connection of the cross member 6 to the side frame 3. The upper surface 8 of the suspension bracket 8 is attached to the joint between the reinforcements (A) and (B) by using a reinforcement (B) 7 for reinforcing the part.
3 and the suspension mounting portion is formed in the closed cross section of the side frame 3 so that the allowable expansion and contraction stroke of the strut 9 including the shock absorber 91 and the suspension spring 92 is provided, and the suspension mounting portion is provided on the lower surface of the side frame. The height of the vertical wall of the side frame 3, which has the greatest influence on the frame strength, is not reduced, and the periphery of the mounting hole 32 of the side frame 3 and the cross member 6 The joint with the lower surface and the joint between the reinforcement (A) 4 and the reinforcement (B) 7 are firmly connected by a suspension bracket 8, and the suspension bracket 8 is stiffened in the vicinity of the mounting hole 32. Since it functions as a member, the strength and rigidity of the side frame 3 are sufficiently ensured, and the vibration of the vehicle body Can be reduced and improvement of steering stability of the sound.

In the present invention, as shown in FIG. 2, the lower surface of the side frame 3 near the suspension mounting portion is formed as an inclined surface which rises from the inside to the outside. A softer characteristic can be obtained by combining a suspension mounting part structure capable of increasing the permissible expansion / contraction stroke of the strut 9 and a structure capable of increasing the vertical swing angle of the suspension arm. A rear suspension can be obtained. In particular, when a double wishbone type suspension is used as the rear suspension, it is extremely effective in that it can sufficiently cope with the swing of the upper arm 10.

[0016]

As described above, according to the present invention, in the rear suspension of the type in which the suspension load is supported by the side frame, the reinforcement (A) fixed to the side frame over the entire length to reinforce the side frame. Strength and rigidity of the rear suspension mounting part by using a reinforcement (B) that reinforces the joint between the side member and the cross member to distribute the suspension load accurately between the side frame and the cross member. The shock absorber and suspension spring can have a large allowable expansion and contraction stroke, and the swing angle of the suspension arm can be made sufficiently large, so that the structure is simple and the cost is low. Together, they have a great effect in practical use It is get those.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, showing a rear suspension mounting portion with a floor removed.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a sectional view taken along line YY of FIG. 1;

FIG. 4 is a cross-sectional view showing an example of a conventional rear suspension mounting portion.

[Explanation of symbols]

 Reference Signs List 1 floor 2 wheel apron 3 side frame 4 reinforcement (A) 6 cross member 7 reinforcement (B) 8 suspension bracket 9 strut 32 mounting hole 81 peripheral surface 82 outward flange 83 upper surface 91 shock absorber 92 suspension spring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 25/20

Claims (2)

(57) [Scope of request for utility model registration] 1. A reinforcement (A) is fixed over the entire length in a side frame joined and fixed to a lower surface of a side edge of a floor to form a closed cross section in the front-rear direction so as to partition the closed cross section vertically. Reinforcement that is interposed and fixed between the vicinity of the joint with the side frame and the lower surface of the floor of the cross member that forms a closed cross section in the vehicle width direction.
(B) is joined and fixed to the reinforcement (A), and a mounting hole for fitting and mounting a suspension bracket is provided on the lower surface of the side frame.
The upper surface is overlapped and fixed on the joint fixing portion between the reinforcement (A) and the reinforcement (B), and the lower edge is overlapped with the lower surface of the cross member on the periphery of the mounting hole of the side frame and fixed. A rear suspension mounting structure for a vehicle, wherein the upper end of the strut of the rear suspension is mounted on the suspension bracket within the closed cross section of the side frame. 2. The rear suspension mounting structure for a vehicle according to claim 1, wherein a lower surface of the side frame near the rear suspension mounting portion is formed as an inclined surface rising from the inside to the outside. Suspension mounting structure.