JP2015128951A - Trailing arm attachment part structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain high rigidity at an attachment place of a trailing arm, while suppressing weight increase and cost increase of a vehicle.SOLUTION: In the trailing arm attachment part structure according to an embodiment of the present invention, a bracket brace attached to a bracket reinforcement for reinforcing a side bracket to which a trailing arm is to be attached includes: a first part extending in a longitudinal direction of a vehicle along a surface, inside in a vehicle width direction, of the bracket reinforcement; a nut attachment part that is disposed at the center, in the longitudinal direction of the vehicle, of the first part, and to which a floating nut is to be fitted; and a pair of beam parts disposed on both sides, in the longitudinal direction of the vehicle, of the nut attachment part respectively, and each extending so as to be laid over the first part and a lower surface of a side member. A lower part of the nut attachment part and lower parts of the pair of beam parts are joined to the bracket reinforcement, and upper parts of the pair of beam parts are joined to the bracket reinforcement or the side member.

Description

  The present invention relates to a trailing arm attachment part structure for attaching a trailing arm connected to an end portion in the vehicle width direction of a torsion beam constituting a rear suspension of a rear part of a vehicle.

  The trailing arm type suspension is a kind of vehicle suspension type, and in a vehicle employing this type, a trailing arm is connected to the left and right of a torsion beam (also referred to as a cross beam) that is a rear suspension. And by attaching this trailing arm to a vehicle, a torsion beam is supported by the vehicle via it (for example, patent documents 1).

JP 2003-154971 A

  In a vehicle, a bending load or a torsional load from a torsion beam is applied more to a mounting portion of a trailing arm than other portions. For this reason, high rigidity is required at the mounting position of the trailing arm to ensure steering stability and NHV (Noise / Vibration / Harshness), and an extension is set at the mounting position of the trailing arm as in Patent Document 1. According to such means, the rigidity of the mounting portion can be improved. However, according to the technique of Patent Document 1, high rigidity is obtained at the mounting position of the trailing arm, but the addition of a member such as an extension causes an increase in the weight and cost of the vehicle.

  The present invention has been made in view of such problems, and an object thereof is to provide a trailing arm mounting portion structure capable of obtaining high rigidity at a trailing arm mounting position while suppressing an increase in the weight and cost of a vehicle. It is said.

  In order to solve the above-described problems, a typical configuration of the trailing arm mounting portion structure according to the present invention is such that a trailing arm connected to the vehicle width direction end portion of the torsion beam constituting the rear suspension of the rear portion of the vehicle is attached to the vehicle. A trailing arm mounting structure to be mounted, which includes a side member extending in the vehicle front-rear direction below a rear floor panel constituting a floor surface of the rear portion of the vehicle, a side sill extending in the vehicle front-rear direction on the vehicle outer side of the side member, Side bracket that is joined to the end and to which the trailing arm is attached, bracket reinforcement that is joined to the side bracket and reinforces the side bracket, and the lower surface of the side member that is arranged on the vehicle rear side of the bracket reinforcement on the vehicle rear side And the bracket reinforcement The bracket brace includes a first part extending in the vehicle front-rear direction along the inner surface in the vehicle width direction of the bracket reinforcement, and a floating nut attached to the center of the first part in the vehicle front-rear direction. A nut mounting portion, and a pair of beam portions that are disposed on both sides of the nut mounting portion in the vehicle front-rear direction and extend so as to straddle the first portion and the lower side surface of the side member, and a lower portion of the nut mounting portion and a pair of beams The lower part of the part is joined to the bracket reinforcement, and the upper part of the pair of beam parts is joined to the bracket reinforcement or the side member.

  According to the said structure, the rigidity around a nut attaching part can be improved with a pair of beam part. Therefore, it is possible to increase the rigidity against the load applied from the bolt attached to the floating nut while suppressing an increase in the weight and cost of the vehicle. The bracket brace is joined to the bracket reinforcement or the side member at the lower portion of the nut mounting portion and at the upper and lower portions of the pair of beam portions. As a result, the bracket brace is joined to the bracket reinforcement and the side member at five locations centering on the floating nut. Therefore, the load applied to the bracket brace can be efficiently distributed to the vehicle body through the bracket reinforcement and the side member.

  The nut mounting portion bulges inward in the vehicle width direction with respect to the first portion, and the bracket brace is at least one of a region between the nut mounting portion and each of the pair of beam portions in the vehicle front-rear direction. It is good to join with bracket reinforcement. According to this configuration, the trough portion sandwiched between the nut mounting portion and the pair of beam portions is formed on both sides of the nut mounting portion in the vehicle longitudinal direction, and the bracket brace is joined to the bracket reinforcement at the trough portion. The Thereby, since the very vicinity of the nut mounting portion is joined to the bracket reinforcement, it is possible to further increase the rigidity against the load applied from the bolt inserted into the floating nut.

  The bracket brace may have a second portion that extends upward from the upper end of the pair of beam portions along the inner surface of the side member in the vehicle width direction and is joined to the surface. As a result, the load applied to the bracket brace can be more suitably distributed to the side members, and the rigidity of the bracket brace and thus the bracket reinforcement can be further increased.

  In order to solve the above-described problem, another configuration of the trailing arm mounting portion structure according to the present invention is such that a trailing arm connected to an end portion in the vehicle width direction of the torsion beam constituting the rear suspension of the rear portion of the vehicle is attached to the vehicle. Trailing arm mounting portion structure, a side member extending in the vehicle front-rear direction below a rear floor panel constituting the floor surface of the vehicle rear portion, a side sill extending in the vehicle front-rear direction on the vehicle outer side of the side member, and a rear end of the side sill A side bracket to which the trailing arm is attached and a bracket reinforcement joined to the side bracket to reinforce the side bracket. The bracket reinforcement includes a first part extending in the vehicle front-rear direction, Is it a position separated from the rear end and the rear end by a predetermined distance in the vehicle longitudinal direction? A pair of beam portions extending so as to straddle the first portion and the lower side surface of the side member, and a nut attachment portion that is disposed between the pair of beam portions in the vehicle front-rear direction and to which a floating nut is attached. .

  According to this configuration, the first portion and the beam portion are integrally provided on the bracket reinforcement, so that the rear portion of the bracket reinforcement can function as a bracket brace. Therefore, it is possible to obtain the same effect as the trailing arm mounting portion structure provided with the bracket brace described above while reducing the number of parts.

1 is an overall perspective view of a vehicle including a trailing arm mounting portion structure according to the present embodiment. It is an enlarged view of FIG.1 (b). It is a figure which shows the modification of the bracket reinforcement shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is an overall perspective view of a vehicle 100a including a trailing arm attachment part structure (hereinafter simply referred to as an attachment part structure 100) according to the present embodiment. FIG. 1A is an overall perspective view of the vehicle 100a observed from the left side, and FIG. 1B is an overall perspective view of the vehicle 100a observed from below.

  As shown in FIG. 1A, a vehicle 100a is provided with a rear floor center panel (hereinafter referred to as a rear floor panel 102) as a rear floor panel that constitutes a floor surface at the rear of the vehicle. As shown in FIG. 1B, a torsion beam 104 constituting a rear suspension at the rear of the vehicle is disposed below the rear floor panel 102. Trailing arms 106a and 106b are connected to both ends of the torsion beam 104 in the vehicle width direction. The attachment portion structure 100 according to the present embodiment is a structure for attaching these trailing arms 106a and 106b to the vehicle 100a.

  FIG. 2 is an enlarged view of FIG. FIG. 2A is an enlarged view in a broken circle in FIG. 1B, and shows a state in which the trailing arm 106a shown in FIG. 1B is not shown. FIG. 2B is a view for explaining the joining point of the bracket brace 150, and the trailing arm 106a is not shown in the same manner as FIG. Since the trailing arms 106a and 106b have the same configuration in a bilaterally symmetric manner, the following description will be given by exemplifying a case where the trailing arm 106a is attached to the vehicle.

  As shown in FIG. 1B, in the vehicle 100a, a rear floor side member (hereinafter referred to as a side member 110) that is a side member extending in the vehicle front-rear direction is disposed below the rear floor panel 102. As shown in FIGS. 2A and 2B, a side sill rear extension (hereinafter referred to as a side sill 120) is disposed on the vehicle outer side of the side member 110 as a side sill extending in the vehicle front-rear direction.

  A trailing arm outside bracket (hereinafter referred to as a side bracket 130) that is a side bracket to which the trailing arm is attached is joined to the rear end of the side sill 120. Further, a trailing arm bracket reinforcement (hereinafter referred to as a bracket reinforcement 140) is joined to the side bracket 130 as a bracket reinforcement for reinforcing the side bracket 130.

  In the present embodiment, the bracket brace 150 is disposed on the inner side in the vehicle width direction on the vehicle rear side of the bracket reinforcement 140 so as to straddle the lower surface 112 of the side member 110 and the vehicle inner surface 142 of the bracket reinforcement 140. The As a feature of the present embodiment, the bracket brace 150 includes a first portion 152, a nut attachment portion 154, and a pair of beam portions 156a and 156b.

  The first portion 152 is a portion (surface) that extends in the vehicle front-rear direction along the vehicle inner surface 142 that is the inner surface in the vehicle width direction of the bracket reinforcement 140. A nut mounting portion 154 is disposed at the center of the first portion 152 in the vehicle front-rear direction. A floating nut 162 into which a bolt (not shown) for attaching the trailing arms 106a and 106b (see FIG. 1) to the vehicle is inserted is attached to the nut attaching portion 154 via the floating nut attaching bracket 160. . A pair of beam portions 156a and 156b extending across the first portion 152 and the lower side surface 112 of the side member 110 are disposed on both sides of the nut mounting portion 154 in the vehicle front-rear direction.

  According to the above configuration, since the periphery of the nut attachment portion 154 is reinforced by the pair of beam portions 156a and 156b, the rigidity around the nut attachment portion 154 is improved. For this reason, the rigidity with respect to the force which deform | transforms the bracket brace 150 to the vehicle front-back direction can be improved. Further, since the rigidity around the nut mounting portion 154 can be improved only by changing the shape of the bracket brace 150 as in the present embodiment, the trailing arms 106a and 106b (see FIG. 1) can be achieved while suppressing weight and cost. ), The rigidity with respect to the load applied from the bolt attached to the floating nut 162 can be increased, and good steering stability and NHV can be ensured.

  In particular, in the present embodiment, as shown in FIG. 2 (b), the bracket brace 150 is placed at the lower part of the nut attaching part 154 (joining point P1) and the lower part of the pair of beam parts 156a and 156b (joining points P2 and P3). It is joined to the bracket reinforcement 140. The bracket brace 150 is joined to the side member 110 at the upper part (joining points P4 and P5) of the pair of beam portions 156a and 156b. In this way, the bracket brace 150 is joined to the bracket reinforcement 140 and the side member 110 at five locations (joining points P1 to P5) centering on the floating nut 162. Thereby, the load applied from the bolt attached to the floating nut 162 can be efficiently distributed to the vehicle body through the bracket reinforcement 140 and the side member 110.

  In the present embodiment, the configuration in which the upper portions of the pair of beam portions 156a and 156b are joined to the side member 110 is illustrated, but the present invention is not limited to this, and the upper portion of the pair of beam portions 156a and 156b is the bracket reinforcement. 140 may be joined. According to this, a load is propagated from the bracket brace 150 to the bracket reinforcement 140, and the load is propagated to the side member 110 via the bracket reinforcement 140. Then, the load can be distributed to the entire vehicle body through the side member 110.

  As shown in FIG. 2A, in the present embodiment, the nut attachment portion 154 is bulged toward the inner side in the vehicle width direction with respect to the first portion 152. As a result, since the nut mounting portion 154 has a three-dimensional shape, it is possible to improve the rigidity of the nut mounting portion 154 and to suppress the surface deformation of the nut mounting portion 154, and to apply a load applied from a bolt attached to the floating nut 162. On the other hand, higher rigidity is obtained.

  Further, as described above, the nut mounting portion 154 bulges inward in the vehicle width direction, whereby the nut mounting portion 154 and the pair of beam portions 156a and 156b are provided on both sides of the nut mounting portion 154 in the vehicle front-rear direction. Between these, valleys 158a and 158b are formed. In the present embodiment, the bracket brace 150 and the bracket reinforcement 140 are joined at the valleys 158a and 158b in addition to the joint points P1 to P5 described above (joint points P6 and P7).

  As described above, the valley portions 158a and 158b formed in the regions between the nut attachment portion 154 and the pair of beam portions 156a and 156b, that is, the very vicinity of the nut attachment portion 154 are joined to the bracket reinforcement 140. Thereby, the joint strength between the bracket brace 150 and the bracket reinforcement 140 can be increased. Therefore, it is possible to obtain higher rigidity in the bracket brace 150.

  In the present embodiment, the bracket reinforcement 140 and the bracket brace 150 are joined at both the trough portions 158a and 158b formed in the region between the nut mounting portion 154 and the pair of beam portions 156a and 156b in the vehicle longitudinal direction. The structure to perform was illustrated. However, the present invention is not limited to such an embodiment. It is good also as a structure which joins the bracket reinforcement 140 and the bracket brace 150 in any one of the two trough parts 158a * 158b.

  Further, as a feature of the present embodiment, the bracket brace 150 extends upward from the upper ends of the pair of beam portions 156a and 156b along the inner side surface 114 that is the inner surface in the vehicle width direction of the side member 110 and is joined to the surface. Second portions 164a and 164b are provided. As a result, the bracket brace 150 can be joined so as to straddle the inner side surface 114 of the side member in addition to the vehicle inner side surface 142 of the bracket reinforcement 140 and the lower side surface 112 of the side member 110. As a result, the load can be more suitably distributed to the side members 110. Therefore, the load applied to the bracket brace 150 and the bracket reinforcement 140 can be reduced. Further, since the bracket brace 150 has a three-dimensional shape, the rigidity against loads from more directions can be exhibited.

  FIG. 3 is a diagram showing a modification of the bracket reinforcement shown in FIG. In addition, about the component same as the attachment part structure 100 and the bracket reinforcement 140 mentioned above, description is abbreviate | omitted by attaching | subjecting the same code | symbol. In the bracket reinforcement 140a shown in FIG. 3, a pair of beam portions 156a and 156b and a nut attachment portion 154 are integrally provided in a first portion 152 extending in the vehicle longitudinal direction. The pair of beam portions 156a and 156b extend so as to straddle the first portion 152 and the lower surface 112 of the side member 110 from a rear end of the first portion 152 and a position spaced from the rear end by a predetermined distance in the vehicle front-rear direction. A floating nut 162 through which a bolt (not shown) for attaching the trailing arms 106a and 106b (see FIG. 1) to the vehicle is inserted between the pair of beam portions 156a and 156b in the vehicle front-rear direction. A nut mounting portion 154 is disposed.

  As described above, a pair of beam portions 156a and 156b and a nut mounting portion 154 are integrally provided in the first portion 152 of the bracket reinforcement 140a. Thereby, the function as the bracket brace 150 shown in FIG. 2 can be obtained in the rear part of the bracket reinforcement 140a. Therefore, it is possible to obtain the same effect as the case where the bracket brace 150 described above is provided without requiring the bracket brace 150. Further, since it is not necessary to provide the bracket brace 150, the work of joining the bracket brace 150 to the bracket reinforcement 140 or the side member 110 becomes unnecessary. Therefore, according to the configuration shown in FIG. 3, the number of parts and the number of weldings can be reduced, and the manufacturing cost can be reduced and the manufacturing efficiency can be improved.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  INDUSTRIAL APPLICABILITY The present invention can be used for a trailing arm attachment portion structure that attaches a trailing arm connected to an end portion in the vehicle width direction of a torsion beam that constitutes a rear suspension at the rear of a vehicle.

DESCRIPTION OF SYMBOLS 100 ... Mounting part structure, 100a ... Vehicle, 102 ... Rear floor panel, 104 ... Torsion beam, 106a ... Trailing arm, 106b ... Trailing arm, 110 ... Side member, 112 ... Lower side surface, 114 ... Inner side surface, 120 ... Side sill, 130 ... Side bracket, 140 ... Bracket reinforcement, 140a ... Bracket reinforcement, 142 ... Vehicle inner surface, 150 ... Bracket brace, 152 ... First part, 154 ... Nut mounting part, 156a ... Beam part, 156b ... Beam part, 158a ... Valley, 158b ... Valley, 160 ... Floating nut mounting bracket, 162 ... Floating nut, 164a ... Second part, 164b ... Second part

Claims (4)

A trailing arm attachment structure for attaching to a vehicle a trailing arm connected to a vehicle width direction end of a torsion beam constituting a rear suspension of the vehicle,
A side member extending in the vehicle front-rear direction below a rear floor panel constituting a floor surface of the rear of the vehicle;
A side sill extending in the vehicle front-rear direction on the vehicle outer side of the side member;
A side bracket to which the trailing arm is attached to the rear end of the side sill;
A bracket reinforcement joined to the side bracket to reinforce the side bracket;
A bracket brace disposed on the vehicle width direction inner side of the bracket reinforcement on the vehicle rear side and straddling the lower surface of the side member and the vehicle inner surface of the bracket reinforcement;
The bracket brace is
A first portion extending in the vehicle front-rear direction along the inner surface in the vehicle width direction of the bracket reinforcement;
A nut mounting portion disposed in the center of the vehicle front-rear direction of the first part and to which a floating nut is mounted;
A pair of beam portions disposed on both sides of the nut mounting portion in the vehicle front-rear direction and extending so as to straddle the first portion and the lower side surface of the side member;
The lower part of the nut mounting part and the lower part of the pair of beam parts are joined to the bracket reinforcement,
The trailing arm mounting portion structure is characterized in that upper portions of the pair of beam portions are joined to the bracket reinforcement or the side member. The nut mounting portion bulges inward in the vehicle width direction with respect to the first part,
2. The tray according to claim 1, wherein the bracket brace is joined to the bracket reinforcement in at least one of regions between the nut mounting portion and the pair of beam portions in the vehicle front-rear direction. Ring arm mounting structure.   3. The bracket brace has a second portion that extends upward along the inner surface in the vehicle width direction of the side member from the upper ends of the pair of beam portions and is joined to the surface. The trailing arm attachment structure described in 1. A trailing arm attachment structure for attaching to a vehicle a trailing arm connected to a vehicle width direction end of a torsion beam constituting a rear suspension of the vehicle,
A side member extending in the vehicle front-rear direction below a rear floor panel constituting a floor surface of the rear of the vehicle;
A side sill extending in the vehicle front-rear direction on the vehicle outer side of the side member;
A side bracket to which the trailing arm is attached to the rear end of the side sill;
A bracket reinforcement joined to the side bracket to reinforce the side bracket,
The bracket reinforcement is
A first portion extending in the vehicle longitudinal direction;
A pair of beams extending from the rear end of the first part and a position spaced apart from the rear end by a predetermined distance in the vehicle front-rear direction across the first part and the lower surface of the side member;
A trailing arm mounting portion structure comprising: a nut mounting portion that is disposed between the pair of beam portions in the vehicle front-rear direction and to which a floating nut is mounted.

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