JP4457643B2 - Vehicle suspension support structure - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a suspension support structure for a vehicle, and more particularly to a support structure for providing a bracket projecting downward from a skeleton member having a closed cross section provided at the lower part of a vehicle body, and supporting a suspension component such as a strut bar. .

  The suspension structure for the front wheel suspension of an automobile has a suspension member extending in the vehicle width direction between the lower surfaces of the left and right front side members extending in the longitudinal direction of the vehicle body. There is something that was made to support.

  FIG. 4 shows a general support structure of this type of suspension, and the front lower surface of the side end portion of the suspension member 1 having a closed section with the upper panel 1a and the lower panel 1b opens obliquely downward in the vehicle outward direction. A suspension arm attachment portion 10 is formed, and a base end of the suspension arm 2 that extends to the outside of the vehicle and supports the front wheel W is pivotally supported by the support shaft 11 so as to be swingable in the vertical direction. Yes. Although not shown, the suspension arm 2 is provided with a strut-type shock absorber that suppresses the vertical swing of the suspension arm 2 in response to the push-up input of the front wheel W, and the upper end of the suspension arm 2 is the suspension of the vehicle body. Connected to the top of the tower.

  Also, the suspension arm 2 is provided with a metal strut bar 3 extending obliquely rearward from the front end side toward the vehicle interior, and the rear end of the strut bar 3 is bracketed to the rear lower surface of the side end of the suspension member 1. The suspension arm 2 is supported by 4Z, and the strut bar 3 suppresses the forward / backward movement of the suspension arm 2 corresponding to the front / rear input of the front wheel W or the like. In FIG. 4, F indicates a front side member.

  FIG. 5 and FIG. 6 show the support structure of the rear end of the conventional strut bar 3, and the bracket 4Z is formed by an upper surface portion 41 and left and right side surface portions 42 refracted downward from left and right side edges thereof. A vertical wall 45 made of two metal plates before and after connecting the left and right side surface portions 42 in the orthogonal direction is provided inside the bracket 4Z. The outer peripheral flange is welded to the inner surfaces of the upper surface portion 41 and the left and right side surface portions 42. The upper surface portion 41 of the bracket 4Z is overlapped with the lower panel 1b that forms the bottom wall of the suspension member 1, and is fixed by welding. The rear end of the strut bar 3 is inserted into a through hole 46 formed in the center of the vertical wall 45 through the rubber bush 30 and is screwed into the rear end of the strut bar 3 with a pair of nut members 31. Is fastened so as to sandwich the front and rear.

  By the way, the support part on the vehicle body side of the strut bar 3 has a rear end of the strut bar 3 fastened to a bracket 4Z having a U-shaped cross section projecting from the lower surface of the suspension member 1, but the coupling strength with the suspension member 1 is not always sufficient. It cannot be said. When the suspension arm 2 moves up and down, forces in the vertical direction and torsional direction act on the rear end of the strut bar 3, and this acting force is integrated with the rear end of the strut bar 3 via the bracket 4Z that supports the suspension member 1. The lower panel 1b may be bent and deformed (indicated by the alternate long and short dash line in FIGS. 5 and 6), and welding may be peeled off from the bracket 4Z.

  Conventionally, as described in Patent Document 1 below, a bracket that protrudes downward from a skeleton member of a vehicle body is provided, and the strength of a support portion that supports a component member (trailing arm) of a suspension is enhanced by the bracket. In addition, it has been proposed to form a substantially triangular truss by providing a support rod for connecting the frame member to the side surface of the bracket.

However, in the structure described in Patent Document 1, it is necessary to form a triangular truss by providing a support bar that connects these and the skeleton member to each of a plurality of side surfaces of the bracket. The number of parts increases, the structure becomes complicated, and costs increase.
JP 2000-313361 A

  SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has an object to provide a suspension support structure for a vehicle that has a simple structure that minimizes the number of parts and cost and that has high strength against the force acting from the suspension side. It was made as.

The present invention provides a vehicle suspension in which a bracket projecting downward is installed on a skeleton member having a closed cross section provided at a lower portion of a vehicle body, and a vehicle body side terminal of a member constituting a wheel suspension is supported by the bracket. In the support portion structure, the bracket has a cross section that opens downward from a main body portion and an extension portion that extends forward from the main body portion and whose upper surface portion is one step lower than the upper surface portion of the main body portion. The upper part of the main body part is provided with front and rear vertical surface parts bent downward from the edge of the upper surface part, and the upper part of the main body part is placed on the bottom wall of the skeleton member. An opening to be inserted into the interior is provided, a peripheral wall flange is formed around the opening, the upper portion of the main body is inserted into the skeleton member from the opening, and the upper surface of the main body is inserted into the skeleton member. Heavy on the lower surface of the upper wall The left and right side surfaces of the upper part of the main body and the front and rear vertical surfaces are overlapped and joined to the peripheral flange of the opening, and the upper surface of the extension is connected to the skeleton member. A bulkhead is formed by connecting the upper and lower walls of the bottom wall and connecting the upper wall and the bottom wall of the skeleton member inside the skeleton member by the upper part of the main body part, and a suspension is formed at the lower part of the main body part. allowed to support the terminal member (claim 1).

The upper part of the main part of the bracket is inserted into the inside of the skeleton member through an opening provided in the bottom wall of the skeleton member, the upper surface part of the main body part is coupled to the upper wall of the skeleton member, and the upper part of the extension part of the bracket is Since it is coupled to the bottom wall of the skeleton member, and the upper side surface portion and the vertical surface portion of the main body portion are coupled to the peripheral flange of the opening, the bonding strength between the skeleton member and the bracket can be enhanced, and the bracket can be connected to the bulkhead of the skeleton member. Thus, the rigidity of the skeletal member holding the bracket can be enhanced, and the overall strength of the suspension support portion is enhanced. In addition, since no additional parts are added, the cost can be reduced.

The skeleton member is configured by a suspension member having a closed cross-sectional structure including an upper panel and a lower panel, and the bracket includes a vertical wall that connects right and left side surfaces in an orthogonal direction at an intermediate position inside the lower portion thereof, This allowed to bind support the vertical wall and allowed through a terminal member serving strut bar constituting the suspension to vertical wall (claim 2). The present invention can be suitably used for a support portion of a suspension strut bar.

  According to the suspension support portion structure of the present invention, a high-strength support portion can be configured with a simple structure that minimizes the number of parts and cost, and the deformation of the support portion due to input acting from the suspension side is prevented. be able to.

  The embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the rear lower surface of the rear end of the side end of the suspension member 1 that supports the suspension arm 2 of the front wheel W is installed between the lower surfaces of the left and right front side members F shown in FIG. The bracket 4 is provided to the support portion that supports the end of the strut bar 3 that extends in an oblique direction from the suspension arm 2 toward the vehicle interior and rearward and prevents the suspension arm 2 from moving back and forth. Is applied.

  The suspension member 1 has a closed cross-section with the upper panel 1a and the lower panel 1b, and the front-rear width of the side end is enlarged toward the rear. As shown in FIGS. 1 to 3, the rear end portion of the widened suspension member 1 is closed by superposing the peripheral edge of the flat lower panel 1b on the peripheral flange of the shallow cross-section upper panel 1a. In addition, a rectangular opening 12 for attaching a bracket 4 to be described later is formed at a rear portion of the side end of the suspension member 1 at an intermediate position of the lower panel 1b. A peripheral wall flange 13 having a vertical wall shape that is bent in a substantially L-shaped cross section from the periphery to the inside of the suspension member 1 is formed at the periphery of the opening 12.

Bracket 4 has a main body portion 4a, and extending from the body portion 4a to the front, consisting of height and sunken extending portion 4b than the body portion 4a. The main body portion 4a is formed in a substantially U-shaped longitudinal section of the lower end opening by a rectangular upper surface portion 41 forming a top surface and left and right side surface portions 42 that refract and extend substantially perpendicularly from the left and right side edges. .
In the upper part of the main body part 4a, a refracted and extended downward from the front edge of the upper surface part 41 to form a step with the upper surface part (extended upper surface part) 41a of the extension part 4b, and both left and right edges are A front vertical surface portion 43a that continues to the upper portion of the side surface portion 42 and a rear vertical surface portion 43b that refracts downward from the rear edge of the upper surface portion 41 and extends to the upper portion of the side surface portion 42 are formed. . The height dimensions of both the vertical surface portions 43a and 43b are substantially the same as the thickness of the suspension member 1. A rear edge flange 431 is formed at the lower edge of the rear vertical surface portion 43b so as to refract rearward in a substantially L-shaped cross section and form a height position equivalent to the extended upper surface portion 41a.

The extended portion 4b has an extended upper surface portion 41a that refracts from the lower edge of the front vertical surface portion 43a and extends forward, and continuously extends forward from the left and right side surface portions 42 of the main body portion 4a. The extended side surface portion 42a is formed in a substantially U-shaped longitudinal section. The vertical dimension of the main body portion 4a is larger than that of the extending portion 4b, and the lower edge of the extending side surface portion 42a gradually descends rearward and continues to the lower edge of the side surface portion 42. A lower edge flange 421 refracted in a substantially L-shaped cross section in the outward direction is formed on the lower edge of the extended side surface portion 42 a and the side surface portion 42.

A vertical wall 45 for connecting the rear end of the suspension strut bar 3 is provided in the middle of the lower portion of the main body 4a of the bracket 4 at the front and rear intermediate positions. The vertical wall 45 has a double structure in which two front and rear metal plates are disposed with a slight gap therebetween, and a coaxial through hole 46 is formed at the center of each metal plate . The peripheral portions of both through-holes 46 are formed high in the opposite direction, and both peripheral portions are overlapped and joined. The vertical wall 45 is welded and connected to the inner surfaces of the upper surface portion 41 and the both side surface portions 42 by connecting flanges provided on the outer peripheral edges of both metal plates. Further, the lower edge of the vertical wall 45 is joined to the bottom plate 47 that spans between the lower edge flanges 421 of the left and right side portions 42 in the width direction.

The bracket 4 configured in this manner has the upper surface portion 41 of the main body portion 4a fitted into the opening 12 of the lower panel 1b from below the suspension member 1, the upper surface portion 41 abuts on the lower surface of the upper panel 1a, and is overlapped and welded. The upper portions of the left and right side surface portions 42 and the lower portions of the front and rear vertical surface portions 43a and 43b are respectively brought into contact with the peripheral flange 13 of the opening 12 of the lower panel 1b and superposed and welded, and the extended upper surface portion 41a and the rear vertical surface portion 43 are further welded. The lower edge flange 431 is overlapped and welded to the lower surface of the lower panel 1b.

  The bracket 4 is inserted into the through hole 46 of the vertical wall 45 by inserting the rear end of the strut bar 3 through the rubber bush 30, and the vertical wall 45 is attached to the rear end of the strut bar 3 by a pair of nut members 31. The rear end of the strut bar 3 is supported by being fastened so as to be sandwiched between the front and rear.

According to the present embodiment, the upper portion of the bracket 4 is fitted into the suspension member 1 through the opening 12 formed in the lower panel 1b of the suspension member 1, and the upper surface portion 41 of the bracket 4 is coupled to the upper panel 1a of the suspension member 1. The extended upper surface portion 41 a is coupled to the lower panel 1 b of the suspension member 1, and both side surface portions 42 of the bracket 4 and the front and rear vertical surface portions 43 a and 43 b are coupled to the peripheral flange 13 of the lower panel 1 b around the opening 12. The bonding strength between the bracket 4 and the bracket 4 can be enhanced.

Further, since both the side surface portions 42 of the upper portion of the bracket 4 and the front and rear vertical surface portions 43a and 43b serve as bulkheads for connecting the upper panel 1a and the lower panel 1b of the suspension member 1 up and down, respectively, the rigidity of the suspension member 1 is increased. Can be strengthened.

As described above, since the coupling force between the suspension member 1 and the bracket 4 is strengthened and the rigidity of the suspension member 1 itself is enhanced by the bracket 4, the strength of the support portion that supports the strut bar 3 dramatically by the synergistic effect of both. Can be strengthened. Therefore, even if an input from the strut bar 3 is applied to the support portion when the vehicle is running, the support portion is not deformed. Particularly, when the torsion is input from the strut bar 3, the side surface portion 42 and the vertical surface portion 43a of the bracket 4. , 43b and the peripheral flange 13 of the opening 12 of the lower panel 1b, which supports the rotation of the bracket 4 effectively, can be prevented from being deformed as in the conventional structure.

  Further, the strength can be enhanced by slightly changing the shape of the suspension member 1 and the bracket 4 and changing the coupling structure of the both without reinforcing the conventional structure described in Patent Document 1 with another member. , The structure can be simplified without increasing the number of parts, and the cost can be reduced.

  In the above-described embodiment, the strength of the support portion for supporting the suspension strut bar 3 on the suspension member 1 via the bracket 4 protruding downward is enhanced, but the present invention is not limited to this. The present invention provides a structure of a support portion for supporting a suspension arm by providing a bracket projecting downward from a suspension member, or providing a bracket projecting downward from a front side member of a vehicle body to which a suspension arm, strut bar, etc. The present invention can be applied to a structure of a support portion in which a bracket projecting downward is provided on a skeleton member having a closed cross section of a vehicle body and a structural member of a suspension is supported on the skeleton member.

FIG. 5 shows a structure of a suspension support part of the present invention, and is a cross-sectional view taken along a line TT in FIG. 4. It is sectional drawing in the position which follows the SS line | wire of FIG. 4 which shows the said suspension support part structure. It is a disassembled perspective view of the principal part of the said suspension support part structure. 1 is a schematic plan view of a vehicle suspension support structure to which the present invention is applied. FIG. 5 is a cross-sectional view of the conventional suspension support structure corresponding to FIG. 1 taken along line TT in FIG. 4. FIG. 5 is a cross-sectional view of the conventional suspension support structure corresponding to FIG. 2 along the line SS in FIG. 4.

Explanation of symbols

1 Frame member (suspension member)
1a Upper wall (upper panel)
1b Bottom wall (lower panel)
12 Openings 3 Suspension component (strut bar)
4 Bracket
4a body
4b extension part 41 upper surface part
41a Extension upper surface part 42 Side surface part 43a, 43b Vertical surface part
431 trailing edge flange

Claims (2)

In a suspension support structure for a vehicle in which a bracket projecting downward is installed on a skeleton member having a closed cross section provided at a lower portion of a vehicle body, and a vehicle body side terminal of a member constituting a wheel suspension is supported on the bracket. ,
The bracket is formed in a substantially U-shaped cross section that opens downward by a main body part and an extension part that extends forward from the main body part and whose upper surface part is one step lower than the upper surface part of the main body part. ,
The upper part of the main body part includes front and rear vertical surface parts bent downward from the edge of the upper surface part,
An opening for inserting the upper part of the main body into the inside of the member is provided in the bottom wall of the skeleton member, and a peripheral flange having a vertical wall shape is formed around the opening,
The upper part of the main body part is inserted into the skeleton member through the opening, and the upper surface part of the main body part is overlapped and joined to the lower surface of the upper wall of the skeleton member. And the rear vertical surface portion is overlapped and bonded to the peripheral flange of the opening, and the upper surface portion of the extension portion is overlapped and bonded to the bottom wall lower surface of the skeleton member,
A bulkhead that connects the top wall and bottom wall of the skeleton member inside the skeleton member by the upper part of the main body part, and the terminal of the member that constitutes the suspension is supported at the lower part of the main body part. A vehicle suspension support structure. The skeleton member is configured by a suspension member having a closed cross-sectional structure including an upper panel and a lower panel, and the bracket includes a vertical wall that connects right and left side surfaces in an orthogonal direction at an intermediate position inside the lower portion thereof, 2. The suspension support structure for a vehicle according to claim 1, wherein a terminal of a strut bar, which is a member constituting the suspension, is passed through a vertical wall, and is connected to and supported by the vertical wall .

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