JPH0247097Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a lower body structure of an automobile, and more particularly to a lower body structure in the vicinity of a rear suspension mounting portion.

(Prior Art) An automobile suspension is interposed between the vehicle body and the wheels, and receives external forces, vibrations, etc. that act on the wheels during driving. For this reason,
A large vertical and lateral load is applied to the suspension mounting portion of the vehicle body due to the above-mentioned external forces, vibrations, etc., and the suspension mounting portion must be formed sufficiently strong.

For this reason, for example,
As disclosed in No. 1, a box-shaped reinforcement for reinforcing the suspension mounting portion is provided within the vehicle body frame to strengthen the mounting portion.

(Purpose of the invention) The purpose of the present invention, similar to the above proposal, is to provide a lower body structure for an automobile in which the suspension mounting part has greater strength and rigidity. The purpose is to provide a lower vehicle body structure with high strength and rigidity.

(Structure of the invention) The lower body structure of an automobile of the present invention is arranged between a pair of frames extending longitudinally on both sides of the vehicle body, each end is joined to the frame, and extends in the left-right direction of the vehicle body to form a closed cross section. A cross member is provided to form a cross member, and within the closed cross section of this cross member,
A vertically extending cylindrical recess is formed in the vertical wall of each frame that the end of the cross member abuts, a spacer for the suspension mounting bolt is fitted into this recess, and the bracket holding this spacer is closed. It is characterized in that it is joined to the vertical wall within the cross section.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view showing one embodiment of the lower car body structure of the present invention, in which the direction of the arrow "Front" indicates the front of the car body, and Fig. 3 is a cross section taken along the arrow A-A in Fig. 1. The explanation will be made using the above figures together. In addition,
The lower body structure is symmetrical on the left and right sides of the vehicle, so only the right side of the vehicle is shown in this figure. A side edge 2 is attached to the front lower surface of a frame 1 that extends back and forth on the side of the vehicle body (right side).
A is joined to form a front floor 2, a front end 3a is joined to the rear end of this front floor 2, and a side end is joined to the frame 1, and a cross member lower 3 extending from left to right of the vehicle body is provided. . Located above this cross member lower 3,
A cross member upper 6 having a U-shaped cross section with an open bottom and extending left and right is connected at both ends to the vertical wall of the frame 1, and at the same time, the lower end is connected to the cross member lower 3. will be established. A closed section 7 extending left and right is formed by the upper surface of the cross member lower 3 and the cross member upper 6.
Within this closed section 7, a suspension reinforcement 4 that contacts the vertical wall of the frame 1 is disposed, and a suspension bracket 5 is placed on the vertical wall of the frame 1 at a position surrounded by the suspension reinforcement 4. They are connected and arranged.

Figure 2 shows the structure of Figure 1 in order to clarify the structure of Figure 1.
It is a perspective view showing the structure shown in the figure with the suspension bracket 5 and cross member upper 6 removed. At the rear of the front floor 2 whose end is joined to the lower front surface of the frame 1, the front end of a cross member lower 3 whose structure is shown in FIG. 4D is joined and disposed. Although not shown, the front end of a rear floor is joined to the rear end of the cross member lower 3, and the rear floor is joined to the rear lower surface of the frame 1.

A suspension reinforcement 4 is disposed on this cross member lower 3 and joined to the side wall of the frame 1. As shown in FIG. 4C, the suspension reinforcement 4 has a pair of vertical surfaces 4a and 4b extending front and rear to the left and right of the vehicle body, and the ends of the vertical surfaces 4a and 4b are joined to the vertical walls of the frame 1. Vertical flanges 4c and 4d are formed. On the other hand, the lower surface is approximately circular and protrudes outward from the vehicle body.
A horizontal flange 4e that joins the lower surface of the frame 1 is formed on this protrusion. For this reason, the third
As can be seen from the figure, a suspension reinforcement 4 is joined to the frame 1, and a side portion of the cross member lower 3 is joined to the lower surface of the suspension reinforcement 4.

Furthermore, a cylindrical recess 1a is provided in the vertical wall of the frame 1 and extends vertically between the vertical surfaces 4a and 4b of the suspension reinforcement 4, and the recess 1a is covered with a cylindrical recess 1a as shown in FIG. 4B. A detailed suspension bracket 5 is joined to the frame 1. As shown in FIG. 3, a cylindrical spacer 8 for holding the suspension mounting bolt 9 is attached to the inside of the suspension bracket 5. When the suspension bracket 5 is joined to the frame 1, the spacer 8 is attached. 8
fits into the cylindrical recess 1a of the frame 1. After that, cover the suspension reinforcement 4 and the suspension bracket 5, and
A cross member upper 6 shown in detail in the figure is disposed, and as a result, a suspension reinforcement 4 and a suspension bracket 5 are disposed within a closed cross section surrounded by the cross member lower 3 and cross member upper 6. That will happen.

As shown in FIG. 3, the frame 1 has a U-shaped cross section that is open to the outside of the vehicle body, and the closing plate 10 is inserted from the outside of the frame 1.
is joined to the frame 1 to form a closed cross section, and furthermore, the side sill outer 11 is joined to the closing plate 10 from the outside.

After joining each member as described above, the suspension mounting bolt 9 is inserted into the spacer 8 of the suspension bracket 5 from the bolt hole 6a of the cross member upper 6, and the lower end of this bolt 9 is inserted into the suspension rainforest. It protrudes downward through each bolt hole 4f, 3a of the component 4 and cross member lower 3. A suspension (not shown) is attached to this bolt 9, and the suspension is supported by this structure.

(Effects of the invention) As described above, according to the invention, the spacer into which the suspension mounting bolt is inserted and held is fitted into the recess formed in the vertical wall of the frame, and this is fixed by the suspension bracket. Since it is held, the load received from the suspension, especially the load in the lateral direction of the vehicle body, can be received by the strong vertical walls of the frame, and the strength and rigidity of the suspension mounting portion can be increased. The vertical wall of the frame to which the spacer is fitted is
Since it is a portion within the closed cross section of the cross member joined to the frame, it also obtains the reinforcing effect of the cross member and has particularly high strength, and the above effect is particularly remarkable.

In addition, since the spacer is directly fitted into the recess like the one above, the only part required for mounting the spacer is the bracket mentioned above, and the strength of the spacer mounting part is maintained high, and the spacer mounting accuracy is also high. Secured.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the lower vehicle body structure of the present invention, Fig. 2 is a perspective view showing the structure of the embodiment shown in Fig. 1 with the cross member upper and suspension bracket removed, and Fig. 3. 1 is a sectional view showing this embodiment along the arrow A-A in FIG. 1, and FIGS. 4A to 4D are perspective views showing details of each member in the embodiment of FIG. 1. 1...Frame, 2...Front floor, 3...
...Cross member lower, 4...Suspension reinforcement, 5...Suspension bracket, 6...Cross member top, 7...Closed section, 8...Spacer.

Claims (1)

[Claims for Utility Model Registration] A pair of frames extending front and rear on the left and right sides of the vehicle body, and a closed cross-section that is arranged between the pair of frames and has each end joined to the frames, extending in the left and right direction of the vehicle body. a cross member that forms a vertical wall of the frame to which the cross member is joined within the closed cross section; a bracket joined to a wall and holding the spacer, the vertical wall having a vertically extending cylindrical recess, and the spacer being fitted into the recess. lower body structure.