JPH0513671Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a vehicle body structure of a rear suspension mount portion of an automobile.

[Prior Art] As a conventional vehicle body structure of a rear suspension mount part, there is one shown in FIGS. 7 and 8, for example. (As a similar known example,
There is No. 16273. ) That is, rear floor panel 1
01 is provided with a rear side member 103 having a hat cross section. This rear side member 103 is curved along the curved surface of the rear wheel house inner member 105 from the longitudinal direction of the vehicle body, and the flange portion 107 of the vertical portion 103a is coupled to the lower surface of the rear floor panel 101.
The flange portions 109, 111, 113 at the end portions are the side sill inner member 115a of the side sill 115.
is combined with

Then, the horizontal portion 10 of the rear side member 103
3b, a mount bolt 117 is attached to the rain hose 11 as a mounting member for the rear suspension member 116 at a position near the side sill inner member 115a.
9 and the mounting bolt 117
The rear suspension member 116 is attached to the rear suspension member 116 to transmit vibration input from the rear suspension (not shown) to the side sill 115 on the vehicle body side.

[Problems to be solved by the invention] By the way, in such a conventional vehicle body structure, when an upward vibration input is applied to the rear suspension (not shown) due to wheel bounce, the rear suspension member 116 is Through this, the mount bolt 117 is displaced upward in the vertical direction, and as the mount bolt 117 is displaced, the rear side member 103 is displaced in the same direction. However, the vertical portion 103a of the rear side member 103 is curved at a position near the attachment portion of the mount bolt 117 and has high rigidity, so that deformation in the vertical direction is small. Therefore, as shown by the dotted line or chain line in Fig. 8, the rear side member 1
03, vibrations are more likely to be transmitted to the rear floor panel 101. On the other hand, rear side member 10
The flange portion 111 of No. 3 receives only a force in the shearing direction, and the displacement of the side sill inner member 115a in the vertical direction is small, so that vibrations are hardly transmitted to the side sill 115.

Therefore, even though the rear side member 103 is connected to the side sill inner member 115a for the purpose of transmitting vibration input from the rear suspension to the side sill 115, the vibration input is difficult to be transmitted to the side sill 115, and the vibration input is caused by vertical displacement of the rear side member 103. However, there was a problem in that vibrations were easily transmitted to the rear floor panel 101.

This invention was devised in view of such conventional problems, and aims to provide a vehicle body structure of a rear suspension mount part that can easily transmit vibration input from the rear suspension to the side sill.

[Means for Solving the Problem] This invention includes a rear side member which is provided on the lower surface of the rear floor panel, curves from the longitudinal direction of the vehicle body along the curve of the rear wheel house inner member, and whose end portion is connected to the side sill inner member. ,
and a mounting member supported on the side sill inner member side of the rear side member to which the rear suspension member is attached, wherein the mounting member is a bolt penetrating and supported by a support portion of a horizontal portion of the rear side member. , a reinforcing material for reinforcing the support portion of the bolt is provided on the horizontal portion of the rear side member, and a bracket is provided on the support portion of the bolt for diagonally connecting the horizontal portion of the rear side member and the upper surface of the side sill inner member. The bracket, the side sill inner member, and the horizontal portion of the rear side member provide a closed cross-section portion that is adjacent to the closed cross-section structure of the side sill back to back.

[Function] According to the above configuration, when vertical vibration input is applied from the rear suspension to the rear side member via the rear suspension member and the mounting member, the vertical displacement of the rear side member is suppressed by the bracket, and the side sill Vibration input is transmitted to.

[Example] Examples of this invention will be described below.

Fig. 1 is a partially omitted perspective view of the rear suspension mount section, Fig. 2 is a cross-sectional view taken along the - line in Fig. 1, and Fig. 3 is a cross-sectional view taken along the - line in Fig. 2. It is.

In the figure, on the bottom surface of the rear floor panel 1,
A rear side member 3 having a cross-sectional shape of a hat is provided. This rear side member 3 is curved along the curve of the rear wheel house inner member 5 from the longitudinal direction of the vehicle body. In the rear side member 3, the flange portion 7 of the vertical portion 3a is coupled to the lower surface of the rear floor panel 1, and the flange portions 9, 11, 13 formed at the end portions are connected to the side sill 15.
The side sill inner member 15a is connected to the side sill inner member 15a.

A mount bolt 19 as a mounting member for the suspension member 17 passes through a horizontal support portion C of the horizontal portion 3b of the rear side member 3 at a position near the side sill inner member 15a, and reinforces this support portion C. It is supported via a rain hose 21 as a reinforcing material.

Further, a bracket 23 is spanned between the upper surface side of the rear side member 3 and the side sill inner member 15a side at the support portion of the mount bolt 19, and connects the two obliquely. That is, the flange portion 23a at the lower end of the bracket 23 is connected to the upper surface of the rear side member 3 together with the mount bolt 19 and the rain hose 21, and the flange portion 23b at the upper end is connected to the upper surface B at the upper corner portion A of the side sill inner member 15a to the rear floor panel. It is combined with 1. Therefore,
The bracket 23, the rear side member 3, and the side sill inner member 15a form a triangular structure with a closed cross section h, which is adjacent to the closed cross section structure H of the side sill 15 back to back.

Furthermore, as shown in FIG. 3, the bracket 23 has a plurality of (in this embodiment, two)
beads 23C are formed, and the bracket 23
increasing the strength of

Next, we will discuss the effect.

When vibration input in the vertical direction from the suspension (not shown) due to wheel bounce reaches the rear side member 3 via the suspension member 17 and the mount bolt 19, most of the vibration input is transmitted directly to the side sill inner member 15a via the bracket 23. . When the force is transmitted from the mount bolt 19 to the bracket 23, the rain hose 21
Due to the existence of , transmission can be carried out reliably. Therefore, the rear side member 3 is connected to the bracket 2.
3 suppresses displacement in the vertical direction, and vibration transmission to the rear floor panel 1 is significantly reduced.
Furthermore, since the input to the side sill inner member 15a is performed at the upper corner portion A, which has high rigidity, the influence on the side sill inner member 15a is extremely small. The presence of the beat 23C increases the rigidity of the bracket 23, and the plate thickness can be made thinner, so that the effect on weight increase is small. In addition, since the flange portion 23b of the bracket 23 is connected to the upper surface B of the side sill 15, the force is transmitted from the bracket 23 to the side sill 15 almost in the shear direction (in the upper surface B) with respect to the connection between the two (for example, spot welding). The bracket 23 can reliably transmit the force to the upper surface B of the side sill 15. Since the bracket 23 can be fixed together with the support of the mount bolts 19 and the connection of the rear floor panel 1, no special fixing means is required and the number of man-hours is not affected. Furthermore, since the bracket 23 has a triangular closed cross-sectional structure formed in this portion, it not only suppresses displacement of the side member upwardly of the vehicle body, but also contributes to improving the rigidity of the vehicle body.

4 to 6 show another embodiment. In this embodiment, the rear side member 3 and the side sill inner member 1 are connected to each other via the flange portions 25a and 25b.
Flanges 25C are bent on both inclined edges of the bracket 25 connected to the bracket 5a as shown in FIG. 6 to increase the rigidity of the bracket 25. Further, the end portion of the rear side member 3 is inclined downward and the length of the flange portions 9, 13 is increased to increase the joint area between the rear side member 3 and the side sill inner member 15a.

Therefore, according to this embodiment, the bracket 25
Due to this action and the increase in the joint area between the rear side member 3 and the side sill inner member 15a, vertical displacement of the rear side member 3 can be suppressed more strongly. At the same time, the diagonal portion of the rear side member 3 receives a moment with the flange portion 11 as a fulcrum due to input in the vertical direction, but the rotation tangent direction of the contact point P between the horizontal portion 3b and the diagonal portion is approximately in the diagonal direction of the bracket 25. This makes input to the side sill 15 via the bracket 25 even easier.

In this embodiment, components that are substantially the same as those in the above embodiment are denoted by the same reference numerals, and explanations thereof will be omitted.

[Effects of the invention] As is clear from the above, according to the structure of this invention, the mounting member is a bolt that penetrates and is supported by the support part of the rear side member, so that the vertical direction from the rear suspension member to the bolt is When there is an input, vibration is directly input to the support portion of the horizontal portion of the rear side member, and this input can be reliably received by the support portion reinforced with the reinforcing material. The input received by the reinforced support part is transmitted to the side sill through the closed cross-section part composed of the bracket, the side sill inner member, and the horizontal part of the side member, and can be received by the closed cross-section structure of the side sill. , vertical input from the rear suspension member can be reliably transmitted.

In the closed cross-sectional portion, the force reliably transmitted to the bracket via the reinforcing material can be transmitted from the bracket to the upper surface of the side sill. Therefore, the transmission of force from the bracket to the side sill is as follows:
The connection between the two can be performed in a substantially shear direction, and reliable load transmission can be achieved.

Therefore, vibration input from the rear suspension can be dispersed and reliably transmitted to the side sills, and transmission to the rear floor panel can be suppressed, making it possible to significantly suppress vibrations in the rear floor panel.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted perspective view of the vehicle body structure of a rear suspension mount according to an embodiment of this invention, Fig. 2 is a cross-sectional view taken along the line shown in Fig. 1, and Fig. 3 is a cross-sectional view of Fig. 4 is a partially omitted perspective view of the vehicle body structure of a rear suspension mount portion according to another embodiment of the invention, and FIG. 5 is a sectional view taken along the line - in FIG. 4. , FIG. 6 is a sectional view taken along the - line in FIG. 5, FIG. 7 is a partially omitted perspective view of the vehicle body structure of the rear suspension mount section according to the conventional example, and FIG. FIG. Explanation of symbols representing main parts of the drawings: 1... Rear floor panel, 3... Rear side member, 5...
Rear wheel house inner member, 15a...Side sill inner member, 17...Suspension member, 19...Mount bolt (mounting member),
23, 25...Bracket, B...Top surface, C...
Support part, h...Closed cross-section part, H...Closed cross-section structure.

Claims (1)

[Scope of Claim for Utility Model Registration] A rear side member that is provided on the lower surface of the rear floor panel and is curved along the curve of the rear wheel house inner member from the longitudinal direction of the vehicle body, and whose ends are connected to the side sill inner member; and a mounting member supported on the side sill inner member side to which the rear suspension member is attached, wherein the mounting member is a bolt penetrating and supported by a support portion of a horizontal portion of the rear side member, and the rear side A reinforcing material for reinforcing the support portion of the bolt is provided on the horizontal portion of the member, and a bracket is provided on the support portion of the bolt for diagonally connecting the horizontal portion of the rear side member and the upper surface of the side sill inner member; A vehicle body structure of a rear suspension mount portion, wherein the bracket, the side sill inner member, and the horizontal portion of the rear side member are provided with closed cross-section portions adjacent to the closed cross-section structure of the side sill back to back.