JP2015193331A - Structure of trailing arm attachment part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure of a trailing arm attachment part which can obtain high rigidity even in a trailing arm attachment point while suppressing an increase of the weight and cost of a vehicle.SOLUTION: This structure (attachment part structure 100) of a trailing arm attachment part includes a side member 110, a side sill 120 and a bracket 130. A lower face of the side member is located in an upper part rather than a lower face of the side sill, attached to a side of the bracket at the inside of a vehicle, and includes a reinforcing member 140 which straddles the lower face of the side member and the lower face of the side sill, and connects these lower faces. In a vehicle front view, the reinforcing member has the lower face of the side member, a vertical face of the side sill at the inside of a vehicle width direction, and a plane part 142 having a region which is surrounded by a line component or an arc which connects an end part of the lower face of the side member at the inside of the vehicle width direction and a lower end of the vertical face of the side sill at the inside of the vehicle width direction.

Description

  The present invention relates to a trailing arm attachment structure for attaching a trailing arm of a torsion beam type rear suspension at the rear of a vehicle to a vehicle in a swingable manner.

  The torsion beam type rear suspension is a kind of vehicle suspension type. In the torsion beam type rear suspension, trailing arms are disposed on the left and right sides of a torsion beam (also referred to as a cross beam) that extends in the vehicle width direction below the floor surface at the rear of the vehicle. By attaching this trailing arm to the rear part of the vehicle, the torsion beam type rear suspension is swingably supported by the rear part of the vehicle (for example, Patent Document 1).

JP 2010-111154 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 NVH (Noise, Vibration, Harshness). In addition, the trailing arm has a built-in bush for mitigating the vibration during driving on the road surface because the vibration is input from the rear tire. In order to make this bush function effectively, high rigidity is required locally at the mounting position of the trailing arm.

  According to the means for setting the reinforcing member (stiffener) at the mounting position of the trailing arm as in Patent Document 1, the rigidity of the mounting position can be improved. However, since the reinforcing member of Patent Document 1 is simply a member obtained by bending a plate-like member, it is unlikely that high rigidity can be obtained at the reinforcing member itself, and by extension, at the mounting position of the trailing arm. Moreover, when the reinforcing member is joined to the longitudinal surfaces of the inner support wall and the rear frame as in Patent Document 1, there is a possibility that the rigidity against the load in the vehicle width direction is insufficient.

  As a means for further improving the rigidity of the mounting location of the trailing arm in the structure as in Patent Document 1, it is conceivable to add a new reinforcing member near the mounting location. However, such means can increase the rigidity of the mounting position of the trailing arm, but increases the weight and cost of the vehicle due to the addition of new members. Further, if the plate thickness of the member to be attached to the trailing arm is increased, the rigidity can be increased, but the weight and cost are also increased.

  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 structure of the trailing arm mounting portion structure according to the present invention is a trailing arm mounting portion structure in which the trailing arm of a torsion beam type rear suspension at the rear of the vehicle is swingably mounted on the vehicle. A side member extending in the vehicle front-rear direction below the rear floor panel constituting the 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, and a vehicle interior in the vehicle width direction of the side sill from the lower surface of the side member A bracket that extends downward along the vertical surface, is attached to the side member in the vicinity of the rear end of the side sill, and supports the trailing arm through a bolt that serves as a swing shaft of the side sill. It is located above the lower surface of the bracket and is attached to the vehicle inner surface of the bracket, The reinforcing member further includes a reinforcing member that connects the lower surface of the id member and the lower surface of the side sill, and the reinforcing member includes a lower surface of the side member, a vertical surface on the inner side in the vehicle width direction of the side sill, It has a plane part which has the field surrounded by the line segment or arc which connects from the edge part of the vehicle width direction inside of a lower surface to the lower end of the vertical surface inside the vehicle width direction of a side sill.

  According to the above configuration, since the reinforcing member is attached to the side member and the side sill, which are structural members of the vehicle body, in addition to the bracket, the load applied to the bracket can be suitably distributed throughout the vehicle body. Thereby, a reinforcement effect is heightened and a deformation | transformation of a bracket can be suppressed. That is, it becomes possible to increase the rigidity of the trailing arm mounting location. In particular, in the above configuration, the reinforcing member is attached to the bracket in the vehicle height direction, and is attached to the side member and the side sill in the vehicle width direction. Thereby, the rigidity with respect to the load of a vehicle width direction is improved.

  Moreover, in the said structure, a reinforcement member has a plane part in addition to the surface extended along the vertical surface inside the vehicle width direction of a bracket from the lower surface of a side member. Thereby, since a reinforcement member becomes a three-dimensional shape, the high rigidity with respect to a load is obtained compared with the conventional simple plate-shaped member. Thus, in the said structure, the effect mentioned above is acquired by the joining location and shape change (addition of a plane part) of a reinforcement member. Therefore, it is possible to obtain high rigidity at the trailing arm attachment location while suppressing an increase in the weight and cost of the vehicle.

  The support point of the bolt in the reinforcing member may be located in the region when viewed from the front of the vehicle. According to such a configuration, the support point of the bolt is located in a region reinforced by the flat portion when viewed from the front of the vehicle. Thereby, the rigidity in the vicinity of the support point of the bolt where the load from the trailing arm concentrates most in the bracket can be increased, and deformation due to the load can be suppressed.

  The support point of the bolt in the reinforcing member is preferably located on a line segment connecting the end of the lower surface of the side member on the inner side in the vehicle width direction and the lower end of the vertical surface on the inner side of the side sill in the vehicle width direction. Thereby, since the load applied to the support point of the bolt in the bracket can be most efficiently distributed to the side member and the side sill, the stress applied to the bracket can be reduced and the deformation thereof can be suppressed.

  According to the present invention, it is an object to provide a trailing arm mounting portion structure capable of obtaining high rigidity at a trailing arm mounting position while suppressing an increase in weight and cost of a vehicle.

1 is an overall perspective view of a vehicle including a trailing arm mounting portion structure according to the present embodiment. It is the whole perspective view which observed the vehicle shown in FIG. 1 from the downward direction. FIG. 3 is an enlarged view within a broken-line circle in FIG. 2. It is a figure which shows the state which observed the reinforcement member shown in FIG. 3 from A direction. It is BB sectional drawing of FIG. It is a figure which shows the state which observed the reinforcement member shown in FIG. 3 from the G direction. It is a figure which shows the state which observed the reinforcement member shown in FIG. 3 from the H direction.

  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 provided with a trailing arm mounting portion structure (hereinafter simply referred to as a mounting portion structure 100) according to the present embodiment, and illustrates a state in which the vehicle 100a is observed from the left side. Yes. FIG. 2 is an overall perspective view of the vehicle 100a shown in FIG. 1 observed from below.

  As shown in FIG. 1, a vehicle 100a is provided with a rear floor panel 102 that constitutes a floor surface at the rear of the vehicle. As shown in FIG. 2, a rear floor side member (hereinafter referred to as a side member 110), which is a side member extending in the vehicle front-rear direction, is disposed below the rear floor panel 102.

  In the present embodiment, a rear wheel (not shown) of the vehicle 100a is supported by a torsion beam type rear suspension. Specifically, in the torsion beam type rear suspension, as shown in FIG. 1B, trailing arms 106a and 106b for supporting the rear wheels are arranged at both ends of the torsion beam 104 extending in the vehicle width direction. Such trailing arms 106a and 106b are swingably attached to the vehicle. The attachment part structure 100 of this embodiment is a structure for attaching these trailing arms 106a and 106b to the vehicle 100a.

  FIG. 3 is an enlarged view inside the broken-line circle in FIG. 2, and illustrates a state where the inside of the broken-line circle in FIG. 2 is observed from the lower side of the vehicle. FIG. 4 is a view showing a state in which the reinforcing member 140 shown in FIG. 3 is observed from the A direction. FIG. 5 is a cross-sectional view taken along the line B-B of FIG. 3 and illustrates a state in which the reinforcing member 140 is partially transmitted for easy understanding.

  As shown in FIG. 3, a side sill 120 extending in the vehicle front-rear direction is disposed on the vehicle outer side of the side member 110. As shown in FIG. 5, in the present embodiment, the lower surface 110 a of the side member 110 is positioned above the lower surface 120 a of the side sill 120. Although not shown in the present embodiment, a suspension mounting bush (not shown) is disposed between the side member 110 and the side sill 120 and is attached by being sandwiched between the side sill 120 and a bracket 130 described later. The bush is fixed to the car body.

  As shown in FIG. 4, a bolt 160 (see FIG. 5) that is a swinging shaft of the trailing arm 106 a (see FIG. 1) is penetrated and supported inside the side sill 120 and below the side member 110. A bracket 130 is disposed. As shown in FIGS. 4 and 5, the bracket 130 extends downward from the lower surface 110 a of the side member 110 along the longitudinal surface 120 b on the inner side in the vehicle width direction of the side sill 120, and is attached to the side member 110 near the rear end of the side sill 120. It is attached.

  Moreover, as shown in FIG. 3, the attachment part structure 100 of this embodiment is further comprised including the reinforcement member 140 which reinforces the bracket 130 (refer FIG. 4 and FIG. 5). As shown in FIG. 4, the reinforcing member 140 is attached to the vehicle inner surface of the bracket 130 and connects the lower surface 110 a of the side member 110 and the lower surface 120 a of the side sill 120 across them. That is, in the mounting portion structure 100 of the present embodiment, the bracket 130, the side member 110, and the side sill 120 are connected by the reinforcing member 140.

  By connecting the bracket 130, the side member 110, and the side sill 120 with the reinforcing member 140 as in the above configuration, the load applied to the bracket 130 from the trailing arms 106a and 106b via the bolt 160 (see FIG. 5) is reduced. It is preferably dispersed in the side member 110 and the side sill 120 which are structural members. Thereby, the reinforcement effect by the bracket 130 is enhanced, and the deformation of the bracket 130 due to the load is prevented. That is, it is possible to improve the rigidity of the trailing arm mounting portion.

  As shown in FIG. 4, in this embodiment, the reinforcing member 140 is attached to the vehicle inner surface of the bracket 130 in the vehicle height direction, and the lower surface 110 a of the side member 110 and the lower surface of the side sill 120 in the vehicle width direction. It is attached to 120a. As a result, the rigidity against the load in the vehicle width direction can be increased.

  Further, as a feature of the present embodiment, the reinforcing member 140 has a flat portion 142 as shown in FIG. As shown in FIG. 5, the plane portion 142 (see FIG. 4) includes a lower surface 110 a (line segment C) of the side member 110 and a vertical surface (line segment D) inside the side sill 120 in the vehicle width direction. And a region surrounded by an arc E connecting the end P1 on the inner side in the vehicle width direction of the lower surface 110a of the side member 110 to the lower end P2 of the vertical surface on the inner side in the vehicle width direction of the side sill 120. Accordingly, the reinforcing member 140 has a three-dimensional shape including the vertical surface portion 144 (see FIG. 7) that is a surface extending from the lower surface 110a of the side member 110 along the vertical surface on the inner side in the vehicle width direction of the bracket 130, and the flat surface portion 142. It will have. Therefore, in the reinforcing member 140, it is possible to obtain a higher rigidity with respect to the load as compared with a conventional simple plate-like member, and to exhibit a higher reinforcing effect.

  In the present embodiment, the configuration in which P1 and P2 are connected by the arc E is illustrated. However, the present invention is not limited to this, and P1 and P2 may be connected by a line segment F that is a straight line. . In this case, in this embodiment, the region surrounded by the line segment C, the line segment D, and the arc E is substantially fan-shaped, whereas the region surrounded by the line segment C, the line segment D, and the line segment F is substantially triangular. It becomes a shape.

  In particular, in the present embodiment, the end portion of the arc E of the reinforcing member includes the end portion P1 (ridgeline) on the inner side in the vehicle width direction of the lower surface 110a of the side member 110 and the lower end P2 of the vertical surface on the inner side in the vehicle width direction of the side sill 120. Are arranged to connect. Since these ends P1 and P2 are bent portions between two surfaces of each member, they have high rigidity. Therefore, by disposing the arc ends of the reinforcing member 140 on the ends P1 and P2 as in this embodiment, the deformation of the reinforcing member 140 can be more suitably suppressed.

  As described above, in the attachment portion structure 100 of the present embodiment, the load from the trailing arms 106a and 106b is preferably dispersed by connecting the bracket 130, the side member 110, and the side sill 120 with the reinforcing member 140. Can do. Further, by providing the reinforcing member 140 with the flat surface portion 142, deformation of the reinforcing member 140 is suppressed, and the reinforcing effect can be enhanced. Therefore, by changing the joint location and shape of the reinforcing member 140, high rigidity can be obtained at the attachment locations of the trailing arms 106a and 106b while suppressing an increase in the weight and cost of the vehicle.

  Further, in the present embodiment, as shown in FIG. 5, the support point P3 of the bolt 160 in the reinforcing member 140 is located in the region where the flat surface portion 142 is provided in the vehicle front view (in the region surrounded by the broken line). Is located. As a result, the support point P3 of the bolt 160 is located in a region reinforced by the flat portion 142 in the vehicle front view. Accordingly, the rigidity of the bolt 160 in the vicinity of the support point P3 can be increased, and deformation of the bracket 130 where the loads from the trailing arm trailing arms 106a and 106b are concentrated can be suitably prevented.

  Further, in the present embodiment, as shown in FIG. 5, the support point P3 of the bolt 160 in the reinforcing member 140 is positioned between the end portion P1 on the vehicle width direction inner side end P1 of the lower surface 110a of the side member 110 and the side sill 120. It is located on a line segment F connecting the lower end P2 of the vertical surface on the inner side in the width direction. Thereby, the load applied to the support point P3 of the bolt 160 in the reinforcing member 140 can be most efficiently distributed to the side member 110 and the side sill 120. Therefore, the stress applied to the reinforcing member 140 and the bracket 130 can be reduced, and the deformation starting from the support point P3 of the bolt 160 can be more effectively suppressed.

  6 is a diagram showing a state in which the reinforcing member 140 shown in FIG. 3 is observed from the G direction, and FIG. 7 is a diagram showing a state in which the reinforcing member 140 shown in FIG. 3 is observed from the H direction. As shown in FIGS. 3 and 6, in the mounting portion structure 100 of the present embodiment, in the reinforcing member 140, the side member arc E (the vehicle width of the side sill 120 from the inner side end portion P <b> 1 of the lower surface of the side member in the vehicle width direction). A flange-shaped lower surface portion 144 extending in the vehicle front-rear direction from an arc connecting to the lower end P2 of the vertical surface on the inner side in the direction (see FIG. 5) is provided. Thereby, since the rigidity of the reinforcing member 140 can be increased without requiring an increase in the plate thickness, it is possible to contribute to a reduction in vehicle weight.

  As shown in FIGS. 3 and 7, in the mounting portion structure 100 of the present embodiment, the flat portion 142 bulges in the vehicle width direction below the support point P <b> 3 of the bolt 160 (see FIG. 5). The bulging part 148 which connects the wall surface part 146 provided in the vehicle rear side rather than the part 142 is provided. In this way, by connecting the flat portion 142 and the wall surface portion 146 provided in pairs in the vehicle longitudinal direction by the bulging portion 148, the vehicle longitudinal direction applied to the reinforcing member 140 from the trailing arms 106a and 106b. The rigidity against the load can be increased. Therefore, the deformation of the reinforcing member 140 and the vehicle body can be more effectively suppressed.

  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 in which a trailing arm of a torsion beam type rear suspension at the rear of a vehicle is attached to a vehicle in a swingable manner.

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, 110a ... Lower surface, 120 ... Side sill, 120a ... Lower surface, 120b ... Longitudinal surface, 130 ... bracket, 140 ... reinforcing member, 142 ... flat surface portion, 144 ... bottom surface portion, 146 ... wall surface portion, 148 ... bulge portion, 160 ... bolt

Claims (3)

In the trailing arm attachment structure for attaching the trailing arm of the torsion beam type rear suspension at the rear of the vehicle to the vehicle in a swingable manner,
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 bolt that extends downward from the lower surface of the side member along a longitudinal surface on the inner side in the vehicle width direction of the side sill, is attached to the side member in the vicinity of the rear end of the side sill, and the trailing arm is a bolt that serves as a swing shaft. Including a bracket to be penetrated and supported,
The lower surface of the side member is located above the lower surface of the side sill,
The bracket further includes a reinforcing member that is attached to a vehicle inner surface of the bracket and connects them across the lower surface of the side member and the lower surface of the side sill,
In the vehicle front view, the reinforcing member includes a lower surface of the side member, a longitudinal surface on the inner side in the vehicle width direction of the side sill, and an inner end in the vehicle width direction of the side member on the inner side in the vehicle width direction. A trailing arm mounting portion structure having a flat portion having a region surrounded by a line segment or an arc connecting to the lower end of the vertical surface of the vertical arm.   2. The trailing arm attachment structure according to claim 1, wherein a support point of the bolt in the reinforcing member is located in the region in a vehicle front view. 3.   The support point of the bolt in the reinforcing member is located on a line segment connecting the end portion on the inner side in the vehicle width direction of the lower surface of the side member and the lower end of the vertical surface on the inner side in the vehicle width direction of the side sill in the vehicle front view. The trailing arm attachment structure according to claim 1 or 2, wherein the trailing arm attachment part structure is provided.

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