JPH0687153U - Vehicle rear suspension mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] For mounting a strut consisting of a shock absorber and suspension spring of a vehicle rear suspension on a side frame, to increase the allowable expansion and contraction stroke of the strut and to improve the strength and rigidity of the suspension mounting part. . [Structure] The reinforcement (A) 4 fixed on the side frame 3 and the reinforcement (B) bonded and fixed between the side end portion of the cross member 6 and the floor lower surface.
The side portions of 7 are joined and fixed, and the suspension bracket 8 is fitted through the mounting hole 32 provided on the lower surface of the side frame 3, and the upper surface 83 is fixed to the reinforcement (A) 4 and the reinforcement (B) 7 It is fixedly attached to the joint with the suspension bracket 8
The outward flange 82 of the lower edge is joined and fixed to the peripheral portion of the mounting hole 32 of the side frame 3, and the upper end of the strut 9 of the rear suspension is mounted to the suspension bracket 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle rear suspension mounting structure.

[0002]

[Prior art]

 As shown in FIG. 4, the rear suspension of the vehicle includes a suspension arm axially swingably mounted on a cross member of the vehicle body, and a suspension tower b provided in a cylindrical projection on a part of a wheel apron a. The shock absorber c and / or the suspension spring d are interposed, and the suspension reaction force is fixed to the suspension tower b and the wheel apron a and the wheel apron forming the suspension tower via the shock absorber c and the suspension spring d. In general, the frame e, the rear pillar inner f, etc. are configured to disperse and absorb them (see, for example, Japanese Utility Model Laid-Open No. 60-68875).

[0003]

[Problems to be solved by the device]

 In the case of the above rear suspension mounting structure, the convex suspension tower b has a problem of narrowing the volume of the trunk room. To solve such a problem, the suspension tower is abolished, Conventionally, a means of interposing a shock absorber c and / or a suspension spring d between the suspension arm and the lower surface of the side frame e has been adopted. However, if such a configuration is adopted, the allowable expansion / contraction stroke of the shock absorber c and the suspension spring d must be limited by the protruding height of the side frame e below the floor surface, and the allowable expansion / contraction stroke is too large. The problem arises that things cannot be done.

Although the allowable expansion / contraction stroke of the shock absorber or the suspension spring can be increased by partially lowering the sectional height of the side frame, lowering the sectional height of the side frame lowers the frame strength. The problem arises. That is, the side frame is fixed along the lower part of the side edge of the floor to form a closed surface in the front-rear direction. If it is made too low, the strength and rigidity near the rear suspension mounting part will decrease, which is not desirable in terms of measures against vibration and noise and safety.

The present invention aims to address the above-mentioned conventional problems.

[0006]

[Means for Solving the Problems]

 In the present invention, the reinforcement (A) is fixed over the entire length so as to partition the closed cross section into upper and lower parts in a side frame that is fixedly joined to the lower side edge of the floor to form a closed cross section in the front-rear direction. Reinforcement that is joined and fixed between the bottom surface of the floor and the vicinity of the joint of the cross member that forms a closed cross section in the vehicle width direction by joining and fixing both ends to the side frame. The side part of (B) is bonded and fixed to the above reinforcement (A), and the suspension bracket is fitted into the closed cross section from the mounting hole of the suspension bracket provided on the lower surface of the side frame, and the upper surface of the suspension bracket is attached. The suspension member (A) and the reinforcement member (B) at the joint fixing portion, and the lower edge portion of the suspension bracket is attached to the peripheral portion of the mounting hole on the lower surface of the side frame. Configure the rear suspension attaching portion fixed to overlap with the lower surface, is characterized in that to attach the strut upper portion of the rear suspension in the suspension bracket.

[0007]

[Action]

 As described above, it is the suspension load receiving surface of the rear suspension that uses the reinforcement (A) for reinforcing the side frame and the reinforcement (B) for reinforcing the joint portion of the cross member to the side frame. The upper surface of the suspension bracket is bonded and fixed to the joint between reinforcements (A) and (B) located above the lower surface of the side frame to distribute the suspension load between the side frame and the cross member. The allowable expansion and contraction stroke of the strut consisting of the absorber and the suspension spring can be set larger than before, and the side frame has the greatest effect on the frame strength. The rim of the mounting hole and the reinforcements (A) and (B) above it are strengthened by the suspension bracket. Since the suspension bracket functions as a reinforcing member near the periphery of the mounting hole, the strength and rigidity of the rear suspension mounting part are significantly improved, and vibration noise and maneuverability are improved. You can measure.

[0008]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the figure, 1 is a floor, 2 is a rear wheel apron, and 3 is a side frame that is fixedly joined to the lower surface of the side edge of the floor 1 to form a closed cross section in the front-rear direction. The reinforcement (A) 4 is fixed so as to vertically partition the closed cross section over the entire length, and the doubler 5 is fixedly adhered inside the lower surface of the side frame 3 to reinforce the side frame 3. Has become. On the inner vertical wall of the side frame 3, a fitting fixing portion 31 of a 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 of the cross member 6 are fitted and fixed to the fitting and fixing portions 31 of the left and right side frames 3. The closed cross section in the front-rear direction formed by the frame 3 and the closed cross section in the vehicle width direction formed by the cross member 6 communicate with each other. Reference numeral 7 is a reinforcement (B). The reinforcement (B) 7 has a floor 1 and a fitting portion from the joint portion with the floor 1 near the end portion on the cross member 6 side to the fitting fixing portion 31. The reinforcement (B) 7 laterally extends into the side frame 3 and is bonded and fixed onto the reinforcement (A) 4 of the side frame 3 and By joining and fixing the side end portion to the outer vertical wall of the side frame 3, the strength of the joint between the side frame 3 and the cross member 6 is improved.

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

That is, as shown in FIG. 2, a mounting hole 32 for the suspension bracket 8 is provided in the lower surface of the side frame 3 (and the doubler 5 joined thereto) at the joint with the cross member 6, and By mounting the suspension bracket 8 inside the hole 32 and fixing the suspension bracket 8 to the peripheral portion of the mounting hole 32 and the reinforcement (A) 4 by spot welding or the like, a side frame is formed. The suspension attachment section is configured below the reinforcement (A) 4 in the section 3.

More specifically, the suspension bracket 8 has a substantially cylindrical shape or a somewhat conical shape of a substantially conical upper surface with an outward flange 82 at the lower end and an upper surface 83 at the upper end of the peripheral surface 81. The upper surface 83 is joined to the reinforcement (A) 4 and the reinforcement (B) 7 joined to the upper surface 83 by spot welding and the lower end outward flange 82 is attached to the side frame 3. It is joined to the peripheral portion of the mounting hole 32 and fixed to the peripheral portion of the mounting hole 32 and the lower surfaces of the doubler 5 and the cross member 6 joined thereto by spot welding. The upper end of a conventionally known strut 9 including a shock absorber 91 and a suspension spring 92 around the shock absorber 91 is attached to the suspension bracket 8 via a top mount rubber 93, so that the suspension load is applied to the side frame 3 and the cross member 6. And two reinforcements (A) 4 and reinforcements (B) 7 that overlap each other. A hole 83a is provided in the center of the upper surface 83 of the suspension bracket 8, and a hole 4a that substantially matches the hole 83a is provided in the reinforcement (A) 4, and the upper end of the strut 9 is provided with the hole 83a, It can be projected upward from 4a. In the illustrated embodiment, the reinforcement (B) 7 is formed so as to bypass the holes 83a and 4a, but the reinforcement (B) 7 does not bypass the holes 83a and 4a. When configured, the reinforcement (B) 7 is also provided with a hole.

As described above, for reinforcement of the side frame 3, the reinforcement (A) 4 and the side frame 3 of the cross member 6 fixed along the entire length in the side frame 3 so as to partition the closed cross section into upper and lower parts. Using the reinforcement (B) 7 for reinforcing the joint portion, the upper surface 83 of the suspension bracket 8 is joined and fixed to the joint portion between the reinforcements (A) and (B) to attach the suspension attachment portion to the side frame. Due to the construction within the closed cross section of 3, the allowable expansion and contraction stroke of the strut 9 composed of the shock absorber 91 and the suspension spring 92 can be made larger than that of the conventional one in which the suspension mounting portion is provided on the lower surface of the side frame. In addition, the height of the vertical wall of the side frame 3, which has the greatest effect on the frame strength, is not lowered and the height is not increased. The joint between the peripheral edge of the mounting hole 32 of the frame 3 and the lower surface of the cross member 6 and the joint between the reinforcement (A) 4 and the reinforcement (B) 7 are firmly joined by the suspension bracket 8. Since the suspension bracket 8 functions as a reinforcing and stiffening member near the mounting hole 32, the strength and rigidity of the side frame 3 are sufficiently secured, and the vibration noise of the vehicle body is reduced and the steering performance is improved. be able to.

Further, in the present invention, as shown in FIG. 2, the lower surface of the side frame 3 in the vicinity of the suspension mounting portion is formed into an inclined surface that rises from the inner side to the outer side. By combining a suspension mounting structure that allows a large dynamic angle and a large allowable expansion / contraction stroke of the strut 9 with a structure that can increase a vertical swing angle of the suspension arm, a softer characteristic can be obtained. This is extremely effective in that a rear suspension can be obtained, and particularly when a double wishbone suspension is adopted as the rear suspension, it can sufficiently respond to the swing of the upper arm 10.

[0016]

[Effect of device]

 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 and the cross member for reinforcing the side frame. By using the reinforcement (B) that reinforces the joint part to the side frame and accurately distributing the suspension load between the side frame and the cross member, the strength and rigidity of the rear suspension mounting part is significantly improved. This allows the shock absorber and suspension spring to have a large allowable expansion / contraction stroke, and also allows the suspension arm to have a sufficiently large swing angle, which simplifies the structure and reduces the cost. However, it can bring great effects in practical use. It is.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention and is a perspective view 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.

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

[Explanation of symbols]

 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 Circumferential Surface 82 Outer Flange 83 Upper Surface 91 Shock Absorber 92 Suspension Spring

Claims (2)

[Scope of utility model registration request] 1. A reinforcement (A) is fixed over the entire length so as to divide the closed cross section into upper and lower parts in a side frame that is fixedly joined to the lower surface of the side edge of the floor to form a closed cross section in the front-rear direction. Reinforcement that is fixedly attached to the side frame by joining and fixing both ends to the side frame, and is interposed and fixed between a portion of the cross member forming a closed cross section in the vehicle width direction with the side frame and the lower surface of the floor.
The side part of (B) is bonded and fixed to the reinforcement (A), and a mounting hole for fitting and mounting the suspension bracket is provided on the lower surface of the side frame.
The upper surface of the cross member is fixed to the reinforcement (A) and the reinforcement (B), and the lower edge is overlapped with the lower surface of the cross member at the peripheral edge of the mounting hole of the side frame. A structure for a rear suspension mounting portion of a vehicle, characterized in that the rear suspension strut upper end portion is mounted on the suspension bracket in a closed cross section of the side frame. 2. The vehicle rear suspension mounting structure according to claim 1, wherein the lower surface of the side frame near the rear suspension mounting part is formed into an inclined surface that rises from the inside to the outside. Suspension mounting structure.