JP2005262924A - Suspension mounting structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve strength and rigidity of a sub frame without substantially increasing the mass. <P>SOLUTION: An upper part 30A of a connecting plate 30 is connected to an absorber coupling part 20 extending from a side rail 12 of the sub frame 10 of a rear suspension to the vehicle body oblique upward outside, and a rear end edge part 30C of a lower part 30B of the connecting plate 30 is connected to a suspension arm coupling part 24 extending from the side rail 12 to the vehicle body oblique downward outside. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a suspension mounting structure, and more particularly to a suspension mounting structure applied to a vehicle such as an automobile.

Conventionally, in a suspension mounting structure applied to a vehicle such as an automobile, the support portion of the buffer member is offset upward with respect to the cross member of the subframe, and the lower arm is connected in the axial direction of the crossmember of the subframe. The structure which is known is known (for example, refer patent document 1). Also, a configuration is known in which a mounting portion to a vehicle body, a suspension bracket that forms a bearing portion that pivotally supports one end of each of the lower arm and the upper arm, and a strut tower that supports a shock absorber (for example, , See Patent Document 2).
JP-A-8-295114 JP-A-8-119141

  However, in the suspension mounting structure as in Patent Document 1, in order to obtain the strength and rigidity that can withstand the force that pushes the support portion upward from the buffer member that acts when the vehicle turns, the thickness of the entire subframe is increased. ing. As a result, the mass of the subframe is greatly increased.

  An object of the present invention is to provide a suspension mounting structure that can improve the strength and rigidity of a subframe without significantly increasing the mass in consideration of the above facts.

The suspension mounting structure according to the first aspect of the present invention includes an absorber connecting portion that extends from the side rail of the subframe toward the obliquely upward outer side of the vehicle body,
A suspension arm connecting portion extending from the side rail of the subframe toward the diagonally lower outer side of the vehicle body,
A coupling member connecting the absorber coupling portion and the suspension arm coupling portion;
It is characterized by having.

  Therefore, input from the diagonally lower outer side of the vehicle body to the absorber connecting portion extending from the side rail of the subframe toward the upper obliquely outward side of the vehicle body, and the input from the subframe side rail to the obliquely downwardly outward side of the vehicle body. The input to the suspension arm connecting portion extending in the direction toward the substantially inner side of the vehicle body cancels out by the connecting member that connects the absorber connecting portion and the suspension arm connecting portion. As a result, the input acting on the side rails of the subframe can be reduced. For this reason, compared with the case where the board thickness of the whole sub-frame is made thick, the intensity | strength and rigidity of a sub-frame can be improved, without increasing a mass significantly.

The suspension mounting structure of the present invention according to claim 2 includes an absorber connecting portion extending from the side rail of the subframe toward the obliquely upward outer side of the vehicle body,
A suspension arm connecting portion extending from the side rail of the subframe toward the diagonally lower outer side of the vehicle body,
A coupling member connecting the absorber coupling portion and the suspension arm coupling portion;
An absorber having an upper end connected to the absorber connecting portion;
A suspension arm whose inner end in the vehicle width direction is connected to the suspension arm connecting portion;
It is characterized by having.

  Accordingly, the upper end portion is input from the absorber connected to the absorber connecting portion to the absorber connecting portion extended from the side rail of the subframe toward the upper obliquely outer side of the vehicle body, from the obliquely lower outer side of the vehicle body to the upper obliquely inner side of the vehicle body. Input from the suspension arm whose inner end in the vehicle width direction is connected to the suspension arm connecting portion to the suspension arm connecting portion that extends from the side rail of the subframe toward the obliquely lower outer side of the vehicle body. The opposite input cancels out by the connecting member that connects the absorber connecting portion and the suspension arm connecting portion. As a result, the input acting on the side rails and the front cross member of the subframe can be reduced. For this reason, compared with the case where the board thickness of the whole sub-frame is made thick, the intensity | strength and rigidity of a sub-frame can be improved, without increasing a mass significantly.

  According to the first aspect of the present invention, there is provided a suspension mounting structure according to the first aspect of the present invention, wherein the absorber connecting portion extends from the side rail of the subframe toward the upper obliquely outward direction of the vehicle body, and extends from the side rail of the subframe toward the obliquely downward outer side of the vehicle body. Since the suspension arm connecting portion and the coupling member that connects the absorber connecting portion and the suspension arm connecting portion are provided, the strength and rigidity of the subframe can be improved without significant increase in mass. .

  According to a second aspect of the present invention, there is provided the suspension mounting structure according to the present invention, wherein the absorber connecting portion extends from the side rail of the subframe toward the upper obliquely outer side of the vehicle body, and extends from the side rail of the subframe toward the obliquely lower outer side of the vehicle body. The suspension arm connecting portion, the connecting member connecting the absorber connecting portion and the suspension arm connecting portion, the absorber having the upper end connected to the absorber connecting portion, and the inner end in the vehicle width direction are connected to the suspension arm connecting portion. Therefore, the strength and rigidity of the subframe can be improved without a significant increase in mass.

  An embodiment of a suspension mounting structure according to the present invention will be described with reference to FIGS.

  In the figure, the arrow UP indicates the vehicle body upward direction, the arrow FR in the figure indicates the vehicle body front direction, and the arrow IN in the figure indicates the vehicle width inside direction.

  As shown in FIG. 2, the sub-frame 10 of the rear suspension according to the present embodiment is installed on a pair of left and right side rails 12 extending in the longitudinal direction of the vehicle body and a rear end portion 12A of the pair of left and right side rails 12. The rear cross member 14 and the front cross member 16 installed on the front part 12B of the pair of left and right side rails 12 are provided, and have a well shape in plan view.

  Both ends 14A in the vehicle width direction of the rear cross member 14 are fixed to left and right rear side members (not shown), and the front end portions 12C of the pair of left and right side rails 12 are also fixed to left and right rear side members (not shown). Has been.

  As shown in FIG. 1, an absorber connecting portion 20 extends from the front portion 12B of the pair of left and right side rails 12 (only the side rail 12 on the right side of the vehicle body is shown in FIG. 1) obliquely upward and outward of the vehicle body. ing.

  As shown in FIG. 4, the cross-sectional shape of the absorber connecting portion 20 viewed from the vertical direction of the vehicle body is a U shape with the opening portion facing rearward in the vehicle width direction outer side.

  As shown in FIG. 2, the upper end portion 22 </ b> A of the absorber 22 is connected to the tip end portion 20 </ b> A of the absorber connecting portion 20.

  As shown in FIG. 1, the front portion 12B of the pair of left and right side rails 12 (in FIG. 1, the side rail 12 on the right side of the vehicle body) is obliquely below the vehicle body from the vicinity of the rear side of the vehicle body of the absorber connecting portion 20. A suspension arm connecting portion 24 extends outward. Further, the suspension arm connecting portion 24 has a rectangular closed cross-sectional structure.

  As shown in FIG. 2, the vehicle width direction inner end portion 26 </ b> A of the suspension lower arm 26 on the front side of the vehicle body is connected to the distal end portion 24 </ b> A of the suspension arm connecting portion 24.

  As shown in FIG. 1, a coupling plate 30 as a coupling member is disposed between the absorber coupling portion 20 and the suspension arm coupling portion 24, and the shape of the coupling plate 30 in a side view is a square shape. ing. Further, the upper portion 30A of the coupling plate 30 is coupled to both open end portions 20B of the absorber coupling portion 20 by welding or the like, and the rear end edge portion 30C of the lower portion 30B of the coupling plate 30 is the front wall of the suspension arm coupling portion 24. It is coupled to the portion 24B by welding or the like.

  Therefore, since the absorber connecting portion 20 and the suspension arm connecting portion 24 are connected to each other by the connecting plate 30, the upper end portion 22A is connected from the absorber 22 connected to the absorber connecting portion 20 to the vehicle body from the side rail 12 of the subframe 10. An input (an arrow F1 in FIG. 3) from the obliquely lower outer side of the vehicle body to the absorber connecting portion 20 extending obliquely upward and outward and the diagonally upper inner side of the vehicle body, and the vehicle width direction inner end portion 26A are the suspension arm connecting portions. Input from the suspension lower arm 26 connected to 24 to the suspension arm connecting portion 24 extending from the side rail 12 of the sub-frame 10 toward the diagonally lower outer side of the vehicle body (indicated by an arrow F2 in FIG. 3). Are offset by the coupling plate 30. As a result, the tip end portion 20A of the absorber connecting portion 20 and the tip end portion 24A of the suspension arm connecting portion 24 can be prevented from being deformed from the position shown by the solid line in FIG. The distance L1 between the distal end portion 20A of the connecting portion 20 and the distal end portion 24A of the suspension arm connecting portion 24 can be prevented from spreading to the distance L2.

  2 denotes a suspension upper arm, and 36 denotes a suspension lower arm on the rear side of the vehicle body.

  Next, the operation of this embodiment will be described.

  In the present embodiment, as shown in FIG. 5, when a centrifugal force S is generated at the center of gravity G of the vehicle body 40 during turning and the vehicle body 40 rolls (roll angle θ), the tires 42 and 43 of the vehicle body 40 The horizontal cornering force S1 and the vertical cornering force S2 act respectively. At this time, in the tire 42 outside the center of rotation, the horizontal cornering force S1 acts inward in the vehicle width direction, and at the same time, the vertical cornering force S2 acts upward in the vehicle body.

  As a result, from the absorber 22 whose upper end 22A is connected to the absorber connecting portion 20, from the side rail 12 of the subframe 10 to the absorber connecting portion 20 extending obliquely upward and outward from the vehicle body, A force (arrow F1 in FIG. 5) directed obliquely upward on the vehicle body acts, and from the suspension lower arm 26 in which the vehicle width direction inner end portion 26A is coupled to the suspension arm coupling portion 24, from the side rail 12 of the subframe 10. A force (arrow F2 in FIG. 5) acting substantially inward of the vehicle body acts on the suspension arm connecting portion 24 that extends obliquely downward and outward of the vehicle body.

  On the other hand, in this embodiment, the absorber connecting part 20 and the suspension arm connecting part 24 are connected by the connecting plate 30. Therefore, an input (arrow F1 in FIG. 3) that is input from the absorber 22 to the absorber connecting portion 20 of the subframe 10 toward the absorber connecting portion 20 of the subframe 10 from the obliquely lower outside of the vehicle body to the obliquely upward inside of the vehicle body, and the suspension arm connecting portion of the subframe 10 from the suspension lower arm 26 The input to 24 substantially toward the vehicle body inner side (arrow F2 in FIG. 3) cancels out by the coupling plate 30.

  As a result, the input acting on the side rail 12 and the front cross member 16 of the subframe 10 can be reduced. For this reason, compared with the case where the board thickness of the whole sub-frame 10 is made thick, the intensity | strength and rigidity of the sub-frame 10 can be improved, without the mass increasing significantly.

  That is, the tip portion 20A of the absorber connecting portion 20 and the tip portion 24A of the suspension arm connecting portion 24 are separated from each other as indicated by a solid line in FIG. It is possible to suppress the deformation to the position, and it is possible to suppress the distance L1 between the distal end portion 20A of the absorber connecting portion 20 and the distal end portion 24A of the suspension arm connecting portion 24 from spreading to the distance L2.

  In addition, when the vehicle body changes lanes, particularly on a rough road, the coupling plate 30 similarly applies the input from the absorber 22 to the absorber connecting portion 20 of the subframe 10 from the vehicle body diagonally lower outer side to the vehicle body diagonally upper upper side. Since the input (arrow F1 in FIG. 3) and the input (arrow F2 in FIG. 3) input to the suspension arm connecting portion 24 of the subframe 10 from the suspension lower arm 26 toward the substantially vehicle body can be offset. Strength and rigidity can be improved. In particular, the effect of this structure is very great when cornering on rough roads with the largest input.

  Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, as shown in FIG. 1, the upper part 30A of the coupling plate 30 is joined to the opening both ends 20B of the absorber connecting part 20 by welding or the like, and the rear edge 30C of the lower part 30B of the coupling plate 30 is connected. The upper part 30A of the coupling plate 30 is formed at the opening both ends 20B of the absorber connecting part 20 as shown in FIG. 6 instead of being joined to the front wall part 24B of the suspension arm connecting part 24 by welding or the like. The flange 30D may be coupled to the flange 20C by welding or the like, and the flange 30D formed on the rear end edge portion 30C of the lower portion 30B of the coupling plate 30 may be coupled to the front wall portion 24B of the suspension arm coupling portion 24 by welding or the like.

  Further, as shown in FIG. 7, the torsional rigidity of the coupling plate 30 may be improved by forming the flange 30E at the front edge of the coupling plate 30 and forming the flange 30F at the rear edge. .

  Further, the coupling plate 30 may be integrated with the absorber connecting portion 20.

  In the above embodiment, the suspension mounting structure of the present invention is applied to the subframe 10 of the rear suspension. However, the suspension mounting structure of the present invention is also applicable to the subframe of the front suspension.

It is the perspective view seen from the vehicle body diagonally forward inner side which shows the principal part of the suspension mounting structure concerning one Embodiment of this invention. It is the schematic seen from the vehicle body diagonal front which shows the suspension mounting structure concerning one Embodiment of this invention. It is the schematic front view which made a part the cross section which shows the principal part of the suspension mounting structure which concerns on one Embodiment of this invention. It is a schematic plan view which shows the principal part of the suspension mounting structure which concerns on one Embodiment of this invention. It is operation | movement explanatory drawing of the suspension mounting structure which concerns on one Embodiment of this invention. It is the perspective view seen from the vehicle body diagonally forward inner side which shows the principal part of the suspension mounting structure concerning other embodiment of this invention. It is a schematic plan view which shows the principal part of the suspension mounting structure which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Subframe 12 Side rail of subframe 14 Rear cross member of subframe 16 Front cross member of subframe 20 Absorber connection part 22 Absorber 22A Absorber upper end part 24 Suspension arm connection part 26 Suspension lower arm 26A Vehicle width inside of suspension lower arm End 30 Coupling plate (Coupling member)

Claims (2)

An absorber connecting portion extending obliquely upward and outward from the side rail of the subframe;
A suspension arm connecting portion extending from the side rail of the subframe toward the diagonally lower outer side of the vehicle body,
A coupling member connecting the absorber coupling portion and the suspension arm coupling portion;
A suspension mounting structure comprising: An absorber connecting portion extending obliquely upward and outward from the side rail of the subframe;
A suspension arm connecting portion extending from the side rail of the subframe toward the diagonally lower outer side of the vehicle body,
A coupling member connecting the absorber coupling portion and the suspension arm coupling portion;
An absorber having an upper end connected to the absorber connecting portion;
A suspension arm whose inner end in the vehicle width direction is connected to the suspension arm connecting portion;
A suspension mounting structure comprising:

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