JP2016124345A - Suspension mounting structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension mounting structure capable of improving supporting stiffness against the load input by rear suspensions.SOLUTION: A suspension mounting structure 10 includes: a luggage portion 22 having at least a bottom wall 22A, a rear wall 22B and left and right side walls 22C, provided at a rear panel 20 forming a cabin, protruding toward the rear side of a vehicle body, and extending in a vehicle width direction; a pair of left and right rear side member uppers 14 a front end, in the vehicle body, of each of which is connected to the rear panel 20 at a portion outside of the luggage portion 22 in the vehicle width direction, extending toward the rear side of the vehicle body, and a longitudinally halfway portion of each of which is connected to each of the left and right side walls 22C of the luggage portion 22; and a pair of left and right connection members 50 which connect the rear wall 22B of the luggage portion 22 to the pair of left and right rear side member uppers 14 respectively, and on which upper end portions of a pair of left and right rear suspensions 60 are mounted respectively.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a suspension mounting structure.

  2. Description of the Related Art A structure for mounting a rear suspension in which a damper support for a rear suspension is inserted and attached to a suspension housing is conventionally known (see, for example, Patent Document 1).

Japanese Patent No. 4114002

  However, there is still room for improvement in the suspension mounting structure for ensuring higher support rigidity against the load input by the rear suspension.

  Therefore, an object of the present invention is to obtain a suspension mounting structure that can ensure higher support rigidity with respect to a load input by a rear suspension.

  In order to achieve the above object, the suspension mounting structure according to claim 1 of the present invention is formed so as to protrude toward the rear side of the vehicle body on the rear panel constituting the passenger compartment, and includes at least a bottom wall, a rear wall, and left and right sides. A vehicle body front side end portion is coupled to the luggage compartment portion having a side wall and extending in the vehicle width direction, and the rear panel on the vehicle width direction outer side than the cargo compartment portion, and extends toward the vehicle body rear side. And a pair of left and right rear side member uppers, each of which is coupled to the left and right side walls of the cargo compartment, respectively, and a rear wall of the cargo compartment and the pair of left and right rear side members upper. And a pair of left and right coupling members to which the upper ends of the pair of left and right rear suspensions are respectively attached.

  According to the present invention, higher support rigidity can be ensured with respect to the load input by the rear suspension.

It is a perspective view which shows the rear part of the vehicle provided with the suspension mounting structure which concerns on this embodiment. It is a side view which shows the rear part of the vehicle provided with the suspension mounting structure which concerns on this embodiment. FIG. 3 is a cross-sectional view taken along line XX in FIG. 2. FIG. 3 is a cross-sectional view taken along line YY in FIG. 2. (A) It is sectional drawing which shows the luggage compartment box which comprises the suspension mounting structure which concerns on this embodiment. (B) It is sectional drawing which shows the modification of the luggage compartment box which comprises the suspension mounting structure which concerns on this embodiment.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. For convenience of explanation, an arrow UP appropriately shown in each drawing is an upward direction of the vehicle body, an arrow FR is a forward direction of the vehicle body, and an arrow OUT is an outer side of the vehicle width direction. In addition, in the following description, when the front-rear, up-down, left-right directions are indicated without special mention, the front-rear direction of the vehicle body, the up-down direction of the vehicle body, the left-right direction of the vehicle body (the vehicle width direction) To do.

  As shown in FIGS. 1 and 2, a rear side member upper (hereinafter referred to as “upper member”) extending toward the rear side of the vehicle body is provided on the rear side of the vehicle 12 having the suspension mounting structure 10 according to the present embodiment. 14 are arranged in a pair of left and right. Each upper member 14 is formed into a rectangular closed cross-sectional shape by extrusion molding of a light metal material such as aluminum having a constant cross section, and is a vehicle skeleton member having high rigidity and strength.

  In addition, flat flange portions 16 are fixed to the front end portions of the upper members 14 by welding, and the flange portions 16 are attached to the left and right sides on the upper side of the rear panel 20 by bolt fastening. . The rear panel 20 is a vehicle frame member with high rigidity and strength that constitutes the rear wall of the passenger compartment 18 (see FIG. 5), and is formed of, for example, a carbon fiber reinforced resin material (CFRP).

  In addition, a luggage compartment box 22 is integrally formed on the upper side of the rear panel 20 as a cargo compartment portion that protrudes rearward of the vehicle body and extends in the vehicle width direction (see FIG. 5A). The luggage compartment box 22 constituting the suspension mounting structure 10 is formed in a hollow shape, and a side wall 22C described later is fixed to the middle part of the left and right upper members 14 in the longitudinal direction of the vehicle body by bolting. The fastening structure between the cargo box 22 and each upper member 14 will be described in detail later.

  Further, a rear side member lower (hereinafter referred to as “lower member”) 24 bent in a substantially “L” shape in a side view as viewed from the vehicle width direction on the rear side of the vehicle 12 and on the vehicle body lower side of each upper member 14. Are arranged in a pair on the left and right. Each lower member 24 is formed into a rectangular closed cross-sectional shape by extrusion molding of a lightweight metal material such as aluminum having a constant cross section, and is a vehicle skeleton member having high rigidity and strength.

  Then, a substantially flat flange portion 26 is fixed to the front end portion of each lower member 24 by welding, and each flange portion 26 is attached to each of the left and right sides of the lower side of the rear panel 20 by bolt fastening. Yes. In the following description, a portion of the lower member 24 that extends toward the vehicle body rear side is referred to as a front / rear lower member 24A, and a portion that extends from the rear end portion of the front / rear lower member 24A toward the vehicle body upper side is referred to as an upper / lower lower member 24B.

  Further, the cross-sectional area of each lower member 24 is formed larger than the cross-sectional area of each upper member 14. Thereby, the strength and rigidity of each lower member 24 are configured to be higher than the strength and rigidity of each upper member 14. Each upper member 14 is arranged on the outer side in the vehicle width direction than each lower member 24. For example, each upper member 14 is designed such that the rear side of the vehicle body curves inward in the vehicle width direction in a plan view. It may be a shape having a curvature.

  Lower brackets 28 for attaching lower arms 64 of the rear suspension 60 described later are provided on the lower surfaces of the front and rear lower members 24A extending to the vehicle body rear side of the lower members 24, respectively. In addition, you may make it connect and reinforce the site | part in which the lower bracket 28 of each front and rear lower member 24A is provided by the lower cross member (illustration omitted) extended in a vehicle width direction. This lower cross member is also formed into a rectangular closed cross-sectional shape by extrusion molding of a lightweight metal material such as aluminum having a constant cross section.

  Further, the rear end portion of each upper member 14 and the upper end portion of each upper and lower lower member 24B extending to the upper side of the vehicle body of each lower member 24 are connected by a pair of left and right joint members 30, respectively. Each joint member 30 is formed of a lightweight metal material such as aluminum in a casing shape in which a part of the front wall, a part of the lower wall, and a part of the inner wall are opened.

  Therefore, the rear end portion of each upper member 14 and the upper end portion of each upper and lower lower member 24B are inserted into the openings of the front wall and the lower wall of the joint member 30 from the vehicle body front side and the vehicle body lower side, respectively, and the edge of each opening Are joined by arc welding. Thereby, the rear end part of each upper member 14 and the upper end part of each upper and lower lower member 24B (each lower member 24) are connected via the joint member 30.

  The left and right joint members 30 are connected by an upper cross member 32 extending in the vehicle width direction. The upper cross member 32 is formed in a closed cross-sectional shape by extrusion molding of a lightweight metal material such as aluminum having a constant cross section, and both left and right end portions thereof are inserted into the opening of the inner wall of the joint member 30, and the opening It is joined to the edge of this by arc welding. The vehicle 12 is also provided with a pair of left and right connecting rods 34 that connect the upper wall 30A of each joint member 30 and the rear panel 20.

  Further, in the vicinity of the boundary portion (bent portion) between the front and rear lower members 24A and 24B of each lower member 24, the front end portions of a pair of left and right extension members 36 extending to the rear side of the vehicle body are respectively attached by bolt fastening. ing. Each extension member 36 is also formed in a rectangular closed cross-sectional shape by extrusion molding of a light metal material such as aluminum having a constant cross section.

  A rear bumper reinforcement 38 extending in the vehicle width direction is installed at the rear end of each extension member 36. The rear bumper reinforcement 38 is also formed into a flat closed cross-sectional shape by extrusion molding of a light metal material such as aluminum having a constant cross section, and is joined to the rear end portion of each extension member 36 by arc welding.

  A power unit 40 including an engine is disposed on the vehicle body front side of the rear bumper reinforcement 38 and between the lower members 24. The center portion in the vehicle width direction of the rear bumper reinforcement 38 is curved in an arc shape toward the upper side of the vehicle body in order to avoid the cylindrical muffler 42 extending from the power unit 40.

  Next, the fastening structure between the cargo box 22 and each upper member 14 will be described in detail. As shown in FIGS. 1 to 5, the cargo box 22 formed in a hollow shape has a bottom wall 22A, a rear wall 22B, left and right side walls 22C, and an upper wall 22D. As shown in FIG. 3, the left and right side walls 22 </ b> C are respectively provided on the inner wall 14 </ b> A facing the inner side in the vehicle width direction of the left and right upper members 14. It is fastened and fixed by.

  More specifically, the inner wall 14A of each upper member 14 is formed with a plurality of (for example, the above six) female screw portions 14B, and a bolt 48 is inserted into each side wall 22C of the cargo box 22. A plurality of (for example, six) through holes 23 are formed. Therefore, each side wall 22C of the cargo box 22 is fastened and fixed to the inner wall 14A of each upper member 14 by the bolt 48 being inserted into the through hole 23 from the inner surface side and screwed into the female screw portion 14B. .

  A groove 15 extending along the longitudinal direction of the upper member 14 is formed in the outer wall 14C facing the vehicle width direction outside of each upper member 14, and a slide rail of a slide door (not shown) is formed in the groove 15. 44 is fastened and fixed by mounting bolts 46. Further, as shown in FIG. 4, left and right end portions (corner portion 22E) of the rear wall 22B of the luggage compartment box 22 are coupled to the upper members 14 via upper brackets 50 as coupling members.

  More specifically, each upper bracket 50 is formed in a substantially “U” shape with the open side facing the rear of the vehicle body in plan view, and the outer wall 54 disposed on the outer side in the vehicle width direction is the upper member 14. The inner wall 14A is joined and fixed by arc welding. The left and right end portions (corner portion 22E) of the rear wall 22B of the luggage compartment box 22 are fastened and fixed to the front wall 52 disposed on the vehicle body front side of each upper bracket 50 by bolts 48, respectively.

  That is, the front wall 52 is formed with a female screw portion 52A, and the through holes 23 through which the bolts 48 are inserted are formed at the left and right ends of the rear wall 22B. Therefore, the rear wall 22B of the luggage compartment box 22 is fastened and fixed to the front wall 52 of each upper bracket 50 by the bolt 48 being inserted into the through hole 23 from the inner surface side and screwed into the female screw portion 52A. ing.

  In other words, the left and right corner portions 22E, which are the hardest (most difficult to deform) in the cargo box 22, are formed by the front wall 52 and the outer wall 54 of each upper bracket 50 having a substantially “L” shape in plan view. Is bound to. As shown in FIGS. 1 and 2, the outer wall 54 of each upper bracket 50 and the lower end portion of the inner wall 56 (see FIG. 4) arranged on the inner side in the vehicle width are located on the vehicle body lower side than the upper members 14. It is protruding.

  A through hole (not shown) for inserting a bolt that communicates in the vehicle width direction is formed at the lower ends of the outer wall 54 and the inner wall 56 of each upper bracket 50. Thereby, the upper end part of the shock absorber part 62 of the rear suspension 60 made into a pair of left and right is fastened to the lower end part of each upper bracket 50 by the bolt 66 and the nut 68, respectively (see FIG. 4).

  As shown in FIG. 5A, the luggage compartment box 22 is configured such that the front side of the luggage compartment box 22 is opened by tilting the seat back 58 forward so that luggage or the like can be put in from the compartment 18 side. However, as shown in FIG. 5B, the upper wall 22D may be configured to be openable and closable from the outside of the vehicle. In this case, since each bolt 48 can be fastened from outside the vehicle, the workability is improved. The bolts 48 are fastened from the inside of the cargo box 22 to prevent the heads of the bolts 48 from being exposed to the outside.

  Next, the operation of the suspension mounting structure 10 configured as described above will be described.

  As described above, each side wall 22C of the luggage compartment box 22 is bolted to the inner wall 14A of each upper member 14, and the outer wall 54 is welded to the inner wall 14A of each upper member 14 to the front wall 52 of each upper bracket 50. Both left and right end portions (corner portion 22E) of the rear wall 22B of the cargo box 22 are fastened with bolts. Here, the luggage compartment box 22 is formed integrally with the rear panel 20 and has high strength and rigidity.

  Therefore, the cargo box 22 can function as a reinforcing cross member that connects the left and right upper members 14, and the coupling strength and rigidity between the rear panel 20 and each upper member 14 can be improved. Therefore, the strength and rigidity of the vehicle 12 made of a lightweight material such as aluminum or CFRP, which is lower in strength than a steel plate, can be reinforced, resulting in an increase in weight and cost due to the addition of reinforcing parts and an increase in plate thickness. Can be avoided.

  Further, the upper end portion of the shock absorber portion 62 of the rear suspension 60 is bolted to an upper bracket 50 that is directly coupled to the hardest (hardest deformable) corner portion 22E in the cargo box 22. Therefore, even if a load directed from the rear wheel to the upper side of the vehicle body is input to the upper bracket 50 via the shock absorber 62 of the rear suspension 60, it is possible to sufficiently secure the support strength and the support rigidity with respect to the load.

  Therefore, the strength and rigidity of the vehicle 12 itself can be improved, and the torsion and vibration of the vehicle body when the vehicle 12 is traveling can be greatly suppressed. That is, the steering stability performance of the vehicle 12 can be improved. Further, when the vehicle 12 collides rearward, each upper member 14 and each extension member 36 are compressed and deformed in the axial direction (vehicle body longitudinal direction) to absorb a part of the collision load, and the luggage compartment box 22 becomes a barrier.

  That is, not only each upper member 14 and each extension member 36 but also the cargo box 22 can be functioned as an energy absorber at the time of a rear collision. In addition, since the left and right joint members 30 are connected to each other by the upper cross member 32, the vehicle 12 transmits the load input to the left or right upper member 14 to the left or right upper member 14. Can be dispersed.

  Therefore, the load concentration on either the left or right upper member 14 can be reduced, and deformation of the rear panel 20 (the vehicle compartment 18) excluding the cargo compartment box 22 can be suppressed. Therefore, the collision safety performance (occupant protection performance) can be improved in the vehicle 12 made of a lightweight material such as aluminum or CFRP having a lower strength than the steel plate.

  The suspension mounting structure 10 according to the present embodiment has been described with reference to the drawings. However, the suspension mounting structure 10 according to the present embodiment is not limited to the illustrated one and does not depart from the gist of the present invention. The design can be changed as appropriate within the range.

  For example, the outer wall 54 of the upper bracket 50 is not limited to a configuration that is coupled to the inner wall 14A of the upper member 14 by arc welding, and may be configured to be coupled to the inner wall 14A of the upper member 14 by bolt fastening. .

  Further, the lower member 24 is not limited to a configuration formed in a bent shape having a front and rear lower member 24A extending in the front-rear direction of the vehicle body and an upper and lower lower member 24B extending in the vehicle body vertical direction, as viewed from the side. You may form in the curved shape which curves toward the vehicle body rear upper side.

  Moreover, the extension member 36 is not limited to the structure couple | bonded with the lower member 24 by bolt fastening, You may be set as the structure couple | bonded with the lower member 24 by the rivet and arc welding which are not shown in figure.

  Further, the upper member 14, the lower member 24, the upper cross member 32, the extension member 36, the rear bumper reinforcement 38, etc. are not limited to the configuration formed by extrusion molding of a lightweight metal material having a constant cross section. The outer panel and the inner panel that are not used may be joined to form a closed cross-sectional shape.

  Further, the upper member 14, the lower member 24, the extension member 36, and the like are not limited to the configuration having a rectangular cross section, and may be configured to have, for example, a circular cross section.

10 Suspension mounting structure 14 Upper member (rear side member upper)
18 Car compartment 20 Rear panel 22 Cargo box (cargo compartment)
22A Bottom wall 22B Rear wall 22C Side wall 50 Upper bracket (coupling member)
60 Rear suspension

Claims (1)

A luggage compartment portion that is formed to protrude toward the rear side of the vehicle body on the rear panel that constitutes the passenger compartment, and has at least a bottom wall, a rear wall, and left and right side walls and extends in the vehicle width direction,
A vehicle body front side end is coupled to the rear panel on the outer side in the vehicle width direction than the cargo compartment, extends toward the rear of the vehicle, and is disposed in the vehicle longitudinal direction in the left and right side walls of the cargo compartment, respectively. A pair of left and right rear side member uppers joined together;
A pair of left and right coupling members to which the rear wall of the cargo compartment portion and the pair of left and right rear side member uppers are respectively coupled, and upper end portions of a pair of left and right rear suspensions are respectively attached;
Suspension mounting structure with

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