JPH0687152U - Vehicle rear suspension mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] The strength and rigidity of the side frame of the side frame, which is joined and fixed to the lower part of the floor side of the vehicle, is provided with the strut mounting part consisting of the shock absorber of the rear suspension and the suspension spring. Ensuring sufficient expansion of the strut expansion and contraction strokes. [Structure] The reinforcement 4 is fixed over the entire length in the side frame 3 so as to divide the closed cross section into upper and lower parts.
The suspension bracket 7 is fitted into the closed cross section through the mounting hole 31 provided on the lower surface of the side frame 3, and the upper surface 73 of the suspension bracket 7 is fixedly joined to the reinforcement 4 by the outward flange of the lower edge of the suspension bracket 7. 72 is bonded and fixed to the peripheral edge of the mounting hole 31 of the side frame 3, and the upper end of the strut 8 of the rear suspension is mounted to the suspension bracket 7.

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]

 According to the present invention, the reinforcement 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. Fit the suspension bracket into the closed cross section through the mounting holes of the suspension bracket provided on the bottom surface, and then bond the top surface of the suspension bracket to the reinforcement and fix it to the bottom edge of the side frame. It is characterized in that the upper end of the strut of the rear suspension is attached to the suspension bracket by being fixed to the peripheral portion of the hole for use.

[0007]

[Action]

 As mentioned above, by using the reinforcement for reinforcing the side frame, the suspension bracket upper surface, which is the suspension reaction force receiving surface of the rear suspension, is bonded and fixed to the reinforcement above the side frame bottom surface. The allowable expansion and contraction stroke of the strut that consists of the shock absorber and suspension spring can be made larger than before, and the side frame has the greatest effect on the frame strength. The rear suspension mounting portion is configured so that the peripheral edge portion of the mounting hole on the bottom surface and the reinforcement above it are firmly coupled by the suspension bracket, and the suspension bracket functions as a reinforcing member near the peripheral portion of the mounting hole. Sufficient strength and rigidity are secured in the vicinity to reduce vibration and noise and It can measure the improvement of cheap properties.

[0008]

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, and 3 is a side frame that is fixedly joined to the lower side edge of the floor 1 to form a closed cross section in the front-rear direction. The reinforcement 4 is fixed so as to vertically partition the closed cross section over the entire length, thereby reinforcing the side frame 3, and the doubler 5 is fixedly joined to the inside of the lower surface of the side frame 3.

Reference numeral 6 denotes a cross member, which is joined and fixed to the lower surface of the floor 1 to form a closed cross section in the vehicle width direction, and both ends thereof are joined to the left and right side frames 3.

The suspension mounting portion of the side frame 3 is configured as shown in FIG.

That is, as shown in FIG. 2, an attachment hole 31 for the suspension bracket 7 is provided in the bottom surface of the side frame 3 (and the doubler 5 joined thereto), and the suspension bracket 31 is provided inside the attachment hole 31. 7 and the suspension bracket 7 is fixed to the peripheral portion of the mounting hole 31 and the reinforcement 4 by spot welding or the like, so that the suspension bracket 7 is attached to the lower side of the reinforcement 4 in the side frame 3. It constitutes the suspension mounting part.

In more detail, the suspension bracket 7 has a substantially cylindrical shape or a somewhat conical shape of a substantially conical upper surface with an outward flange 72 at the lower end and an upper surface 73 at the upper end of the peripheral surface 71. The upper surface 73 is joined to the reinforcement 4 and fixed by spot welding, and the outward flange 72 at the lower end is joined to the periphery of the mounting hole 31 of the side frame 3 by spot welding. Stick to it. The upper end of a conventionally known strut 8 consisting of a shock absorber 81 and a suspension spring 82 around the shock absorber 81 is attached to the suspension bracket 7 via a top mount rubber 83, so that the suspension reaction force is applied to the side frame 3 and the reinforcement. It is designed to be supported by the ment 4. A hole 73a is provided at the center of the upper surface 73 of the suspension bracket 7, and a hole 4a that substantially matches the hole 73a is also provided at the reinforcement 4 so that the upper end of the strut 8 extends from the holes 73a, 4a. It can be projected upward.

As described above, for reinforcement of the side frame 3, the reinforcement 4 which is fixed over the entire length in the side frame 3 so as to divide the closed cross section into upper and lower parts is used, and the suspension bracket 7 is attached to the reinforcement 4. Since the upper surface 73 of the suspension is joined and fixed to form the suspension mounting portion within the closed cross section of the side frame 3, the allowable expansion / contraction stroke of the strut 8 including the shock absorber 81 and the suspension spring 82 is fixed to the lower surface of the side frame. It can be made larger than the conventional suspension mounting part, and the height of the vertical wall of the side frame 3, which has the greatest effect on the frame strength, does not decrease and the periphery of the mounting hole 31 of the side frame 3 The portion and the reinforcement 4 are firmly connected by the suspension bracket 7. Since the suspension bracket 7 functions as a reinforcing and stiffening member in the vicinity of the mounting hole 31, 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 bottom surface of the side frame 3 near 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 8 with a structure that can increase the 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 especially when a double wishbone suspension is adopted as the rear suspension, it can sufficiently respond to the swing of the upper arm 9.

[0016]

As described above, according to the present invention, in a rear suspension of a type in which a side frame supports a suspension reaction force, a reinforcement fixed over the entire length in the side frame is used to reinforce the side frame. By using it, it is possible to secure a sufficient strength and rigidity of the side frame, and to allow a large allowable expansion and contraction stroke of the shock absorber and the suspension spring, and also a sufficiently large swing angle of the suspension arm. In addition to being simple in structure and low in cost, it can bring about great practical effects.

[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 6 Cross Member 7 Sus Bracket 8 Strut 31 Mounting Hole 71 Circumferential Surface 72 Outer Flange 73 Upper Surface 81 Shock Absorber 82 Suspension Spring

Claims (2)

[Scope of utility model registration request] 1. A bottom surface of the side frame, wherein a reinforcement is fixed over the entire length in a side frame which is fixedly joined to a lower portion of a side edge of a floor to form a closed cross section in the front-rear direction so as to divide the closed cross section into upper and lower parts. A mounting hole for fitting and mounting the suspension bracket is provided in the suspension bracket, the upper surface of the suspension bracket is bonded and fixed to the reinforcement, and the lower edge of the suspension bracket is fixed to the peripheral edge of the mounting hole of the side frame. A rear suspension mounting portion structure for a vehicle, characterized in that the upper end of a strut of a rear suspension is mounted on the suspension bracket. 2. The vehicle rear suspension mounting structure according to claim 1, wherein the bottom 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.