JP2012081881A - Suspension arm mounting structure of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension arm mounting structure of a vehicle, which facilitates formation of a mounting part at an aluminum suspension member by molding to improve the productivity of the suspension member, and also which improves the mounting rigidity of the suspension arm and allows sure mounting without causing wobbling.SOLUTION: As the mounting structure of the suspension arm which is attached to the mounting part 4D of the suspension member 4 so as to oscillate, the mounting part 4D of the suspension member 4 is formed of a mounting part upper wall 4D1 and a mounting part lower wall 4D2 which are arranged almost horizontally above and below a bush, and fix the bush, a mounting part front wall 4D3 for connecting the front end of the mounting part upper wall 4D1 and the front end of the mounting part lower wall 4D2, and a mounting part rear wall 4D4 for connecting the rear end of the mounting part upper wall 4D1 and the rear end of the mounting part lower wall 4D2, and is integrally formed into a rectangular cylindrical shape which is opened in right and left directions.

Description

  The present invention relates to a mounting structure for left and right suspension arms that are swingably supported at both left and right ends of an aluminum suspension member disposed below a vehicle engine room.

  The suspension member disposed below the engine room of the vehicle supports the left and right suspension arms so as to be swingable up and down, and has a pair of apron side members disposed along the vehicle front-rear direction on the left and right sides of the engine room. It is a member for connecting and increasing the rigidity of the vehicle body.

  Conventionally, the suspension member is constructed by welding a press-formed product of a sheet metal, and brackets are welded to both left and right end portions to form suspension arm attachment portions, and left and right attachment portions are connected to left and right via bushes. A configuration in which each suspension arm is swingably supported has been adopted. In the suspension member having such a configuration, the brackets are welded to the mounting portions of the suspension arm, respectively, so that the mounting is arranged on both sides of the bush attached to the end of the suspension arm (the mounting portion on the rear side is up and down). A portion (a surface disposed on the upper and lower sides in the mounting portion on the rear side) is formed. Then, the end of the suspension arm is disposed through a bushing on the mounting portion formed between the suspension members (between the upper and lower mounting surfaces in the rear mounting portion), and a bolt inserted through the mounting portion and the inner cylinder of the bushing. By tightening, the suspension member supports the suspension arm through the bush so as to be swingable.

  Incidentally, in recent years, for the purpose of reducing the weight and improving the productivity, the suspension member is integrally formed by casting (die casting or the like) with a lightweight aluminum alloy. Such an aluminum suspension member has a problem that it is difficult to form parallel mounting surfaces in terms of molding. For this reason, in the attachment part on the rear side of the suspension member, parallel upper and lower attachment surfaces are formed by attaching a separate bracket with a bolt or the like. For example, in Patent Document 1, as shown in the partial cross-sectional view of FIG. 11, parallel upper and lower mounting surfaces are formed by a suspension member 104 and a bracket cover 105 separate from the suspension member 104, and the suspension is suspended between these mounting surfaces. The end portion of the arm (lower arm) 130 is arranged together with the bush 138, and the suspension member 104, the bush 138, the bracket cover 105, the bolt 106 that passes through the front side member 101, and the nut 107 that is screwed to this end. The structure which attaches so that rocking is possible is proposed.

  In addition, regarding the mounting portion structure on the front side of the suspension member, Patent Document 2 discloses that one of a pair of mounting walls 204A and 204B formed integrally with the suspension member 204, as shown in a partial side view of FIG. A proposal has been made to make the rigidity of one mounting wall 204A lower than that of the other mounting wall 204B by making the thickness of the mounting wall 204A thinner than the thickness of the other mounting wall 204B. Then, by swinging the casting direction of the mold to one side by the original draft, the outer surface of one mounting wall 204B is made vertical from the beginning, and machining (secondary processing) on the outer surface is omitted. Is disclosed. In FIG. 12, reference numeral 230 denotes a suspension arm mounting portion, 231 denotes a bush press-fitted into the mounting portion 230, and 232 denotes a suspension arm mounting portion 230 to the mounting walls 204A and 204B of the suspension member 204 via the bush 231. A bolt 233 to be tightened is a nut screwed to the end of the bolt 232.

Japanese Patent No. 4025052 JP 2008-201416 A

  However, as proposed in Patent Document 1, the structure in which the bracket cover 105 separate from the suspension member 104 is attached to the suspension member 104 has a problem that the number of parts and the number of attachment steps increase, resulting in an increase in cost.

  By the way, it is necessary to increase the mounting rigidity of the suspension arm to the suspension member in order to improve the running stability and rigidity of the vehicle. However, an aluminum suspension member made of aluminum alloy by casting such as die casting is efficient. It was impossible to obtain a reinforced structure. Further, when the rigidity of the mounting portion of the suspension member is increased, the gap formed to incorporate the bush into the mounting portion (the distance between the upper and lower mounting surfaces-the length of the inner cylinder of the bush) is caused by the deformation of the mounting portion. Since it cannot be absorbed and desired tightening cannot be performed, play may occur between the mounting surfaces and the bush.

  The present invention has been made in view of the above problems, and the object of the present invention is to easily form a mounting portion on an aluminum suspension member by molding to improve the productivity of the suspension member and to form a suspension arm. It is an object of the present invention to provide a suspension arm mounting structure for a vehicle capable of improving the mounting rigidity of the vehicle and realizing a reliable mounting without backlash.

In order to achieve the above object, the invention according to claim 1
An aluminum suspension member integrally formed of an aluminum alloy and having a substantially horizontal upper wall, and a cross-sectional shape having a lower portion opened by a front wall and a rear wall extending downward from front and rear edges of the upper wall;
A suspension arm that is swingably attached to the attachment portion of the suspension member via a bush provided at an end;
A suspension arm mounting structure for a vehicle having:
The mounting portion of the suspension member is disposed substantially horizontally above and below the bush to fix the bush, and the front wall of the mounting portion upper wall and the front wall of the mounting portion lower wall. The mounting portion front wall and the rear end of the upper portion of the mounting portion and the rear portion of the mounting portion that connects the rear ends of the lower portion of the mounting portion are integrally formed into a rectangular cylindrical shape that opens in the left-right direction. To do.

  According to a second aspect of the present invention, in the first aspect of the invention, the distance between the front wall of the mounting portion and the rear wall of the mounting portion in the mounting portion of the suspension member is set to increase toward the vehicle outer side. Features.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the suspension member has a front attachment portion protruding upward from the upper wall on the front side of the left and right end portions as an attachment portion to the vehicle body, Provide rear mounting parts respectively arranged on the rear side of the left and right end parts,
The attachment portion upper wall and the attachment portion lower wall of the attachment portion are arranged in a direction connecting the connection portion of the upper wall and the front attachment portion and the rear attachment portion in plan view.

  According to a fourth aspect of the present invention, in the invention of the third aspect, in the suspension member, the upper wall of the mounting portion is disposed at substantially the same height as the upper wall and is connected to the upper wall. The lower wall is arranged at substantially the same height as the rear mounting portion and is connected to the rear mounting portion.

  According to a fifth aspect of the present invention, in the invention of the fourth aspect, in the suspension member, the front wall of the mounting portion and the upper wall are connected by a peripheral flange extending from a side edge of the upper wall, and the mounting portion The rear wall and the rear mounting portion are connected by a connecting wall.

  According to the first aspect of the present invention, the suspension member mounting portion can be integrally molded into a rectangular cylinder by the mounting portion upper wall, the mounting portion lower wall, the mounting portion front wall, and the mounting portion rear wall by molding. The productivity of the suspension member is increased. In addition, since the upper wall of the mounting part and the lower wall of the mounting part that constitute the upper and lower parallel mounting surfaces of the mounting part of the suspension member can be more easily deformed than other parts, the gap for inserting the bush is provided on the upper and lower mounting surfaces. The suspension arm can be absorbed by the bending deformation of the (attachment portion upper wall and attachment portion lower wall), and the suspension arm can be securely tightened and fixed without play without sacrificing the assembling property.

  According to the invention described in claim 2, since the interval between the front wall of the mounting portion and the rear wall of the mounting portion in the mounting portion of the suspension member is set so as to increase toward the vehicle outer side, it is easy to remove the mold during molding. As a result, the productivity of the suspension member is enhanced, the assembly of the suspension arm (the workability of inserting the suspension member into the mounting portion) is enhanced, and the degree of freedom of the shape of the suspension arm is further enhanced. Further, since the attachment portion front wall and the attachment portion rear wall constituting the attachment portion of the suspension member are not parallel, the attachment rigidity of the suspension arm can be enhanced.

  According to the third aspect of the present invention, the upper wall of the mounting portion and the lower wall of the mounting portion constituting the mounting portion of the suspension member are arranged in a direction with high rigidity (the connection portion between the upper wall and the front mounting portion and the rear mounting portion in plan view). , The mounting rigidity of the suspension arm can be further increased.

  According to the fourth aspect of the present invention, the upper wall of the mounting portion is arranged at substantially the same height as the upper wall and connected to the upper wall, and the lower wall of the mounting portion is arranged at substantially the same height as the rear mounting portion. Thus, since the suspension member is connected to the rear attachment portion, the upper wall of the attachment portion and the lower wall of the attachment portion are arranged as substantially continuous surfaces in the vicinity of the attachment portion of the suspension member to the vehicle body. The rigidity in the direction parallel to each surface of the wall is increased to increase the mounting rigidity of the suspension arm, and the rigidity in the direction perpendicular to the surfaces of the upper wall of the mounting part and the lower wall of the mounting part (the tightening direction of the bush) is relatively It is possible to restrain the suspension arm without looseness by absorbing the bushing insertion gap by the bending deformation of the upper wall of the mounting portion and the lower wall of the mounting portion.

  According to the fifth aspect of the present invention, since the fall of the front wall and the rear wall of the mounting portion constituting the mounting portion of the suspension member is prevented by the peripheral flange or the connecting wall, the mounting rigidity of the suspension arm is increased. In addition, the rigidity in the direction parallel to each surface of the upper wall of the mounting portion and the lower wall of the mounting portion can be effectively increased by the peripheral flange and the connecting wall, and the movement in the displacement direction between the upper wall of the mounting portion and the lower wall of the mounting portion. Can be suppressed. And the rigidity of the direction (bush tightening direction) perpendicular | vertical to the surface of an attaching part upper wall and an attaching part lower wall can be restrained comparatively low.

It is a side view which shows the vehicle body front part structure of a vehicle. It is a disassembled perspective view which shows the structure of the suspension system of a vehicle. It is a top view of a suspension member. It is a bottom view of a suspension member. It is a front view of a suspension member. It is a left view of a suspension member. It is a fragmentary perspective view of a suspension member. It is a disassembled perspective view which shows the suspension arm attachment structure which concerns on this invention. It is the perspective view which looked at the attaching part which shows the attachment point of the suspension arm which concerns on this invention from diagonally downward. It is a fragmentary sectional side view which shows the suspension arm attachment structure which concerns on this invention. It is a sectional side view which shows the conventional attachment structure of a suspension arm. It is a fracture side view showing the conventional attachment structure of a suspension arm.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a side view showing a vehicle body front structure, FIG. 2 is an exploded perspective view showing the structure of a suspension system of the vehicle, FIG. 3 is a plan view of the suspension member, and FIG. 4 is a bottom view of the suspension member. 5 is a front view of the suspension member, FIG. 6 is a left side view of the suspension member, FIG. 7 is a partial perspective view of the suspension member, FIG. 8 is an exploded perspective view showing a suspension arm mounting structure according to the present invention, and FIG. The perspective view which looked at the attaching part which shows the attachment point of a suspension arm from diagonally downward, FIG. 10 is the fragmentary sectional side view which shows the attachment structure of a suspension arm.

  As shown in FIG. 1, a pair of left and right apron side members 1 (only one is shown in FIG. 1) are arranged in the engine room S in the front part of the vehicle along the vehicle front-rear direction (left-right direction in FIG. 1). A pair of left and right apron lower members 2 (only one is shown in FIG. 1) are disposed below the apron side members 1 along the vehicle front-rear direction. A radiator support lower member 3 arranged in the vehicle width direction (perpendicular to the plane of FIG. 1) is installed at the front ends of the pair of left and right apron lower members 2, and at the rear ends of the apron lower members 2 A suspension member 4 disposed in the lower part of the engine room S is connected.

  Each apron side member 1 is composed of front and rear first and second horizontal portions 1A, 1B and an inclined inclined portion 1C that connects both horizontal portions 1A, 1B. A crash box 5 that absorbs impact is attached. An upper bumper member 7 having a pair of upper and lower pipe members 6 extending in the vehicle width direction is connected to the front ends of the left and right crash boxes 5, and a bumper fascia 8 is provided in front of the upper bumper member 7 in the vehicle. It is arranged.

  Further, lamp support braces 9 extending vertically are respectively attached to the inner surfaces of the pair of left and right crash boxes 5 in the vehicle width direction, and a pair of upper and lower pipe members along the vehicle width direction are attached to the front ends of both lamp support braces 9. A lower bumper member 11 having 10 is connected, and a bumper fascia 12 is disposed in front of the lower bumper member 11 in the vehicle. Here, the bumper fascia 8 and the bumper fascia 12 are integrally formed with a radiator air intake port interposed therebetween.

  Next, the structure of the suspension member will be described below with reference to FIGS.

  The suspension member 4 is a member integrally formed by casting with an aluminum alloy (die casting or the like), and extends substantially vertically downward from a substantially horizontal upper wall 4A and front and rear edges of the upper wall 4A. The front wall 4B and the rear wall 4C have a cross-sectional shape opened downward. Here, as shown in FIGS. 2 and 5, a rectangular through hole 14 is formed in the center of the front wall 4B of the suspension member 4 for the torque rod 13 (see FIG. 2) to pass therethrough. Near the right side, a semicircular cutout 16 is formed through which an exhaust pipe 15 extending from an unillustrated engine to the rear of the vehicle passes. A reinforcing rib 17 is integrally formed on the periphery of the notch 16 of the suspension member 4.

  In addition, on the front side of the left and right ends of the upper wall 4A of the aluminum suspension member 4, a post 4b constituting a front mounting portion is provided upright, as shown in FIGS. 3 and 4, at the upper end of each post 4b. A circular hole-shaped bolt insertion hole 18 is provided in the vertical direction. Also, mounting seats 4c (see FIG. 3) constituting rear mounting portions are formed at the rear end corners of the left and right ends of the upper wall 4A of the suspension member 4. As shown in FIGS. A circular bolt insertion hole 19 is provided in the mounting seat 4c in the vertical direction.

  Thus, the suspension member 4 has a bolt 20 (see FIG. 2) inserted from below into the bolt insertion holes 18 formed in the left and right support columns 4b, and the first of the pair of left and right apron side members 1 shown in FIG. A pair of left and right apron side members 1 as shown in FIG. 1 are bolts 21 (see FIG. 2) which are tightened to the lower surface of the rear end of the horizontal portion 1A and inserted from below into a bolt insertion hole 19 formed in the mounting seat 4c. It is attached to the left and right apron side members 1 by tightening to the rear end of the slope portion 1C.

  Meanwhile, the stabilizer 22 and the steering gear box 23 shown in FIG. 2 are attached to the upper part of the suspension member 1, but the stabilizer 22 is provided on the left and right sides of the upper wall 4A of the suspension member 4 as shown in FIGS. Mounting seats 4d for mounting are formed, and mounting seats 4e and 4f for mounting the steering gear box 23 are formed on the left and right in front of these vehicles. Each mounting seat 4d has two screw holes 24, each mounting seat 4e has two screw holes 25, and each mounting seat 4f has one screw hole 25.

  Thus, as shown in FIG. 2, the stabilizer 22 is configured by screwing the two bolts 27 inserted through the holding member 26 into the screw holes 24 of the mounting seat 4 d formed on the upper wall 4 </ b> A of the suspension member 4. The left and right portions are attached to the upper wall 4A of the suspension member 4 along the vehicle width direction. In the steering gear box 23, two bolts 28 are screwed into the screw holes 25 of the mounting seat 4e of the suspension member 4, and two bolts 29 are mounted on the mounting wall 4f formed on the upper wall 4A of the suspension member 4. The left and right portions are attached to the upper surface of the upper wall 4A of the suspension member 4 along the vehicle width direction.

  As shown in FIGS. 2, 7, and 8, the left and right ends of the suspension member 4 are front and rear of the inner end of a pair of left and right suspension arms 30 (only one is shown in the figure) that are Y-shaped in plan view. Is attached so that it can swing up and down. The outer end portions of the left and right suspension arms 30 are pivotally attached to a front wheel knuckle (not shown) via ball joints 31, and the left and right front wheels (not shown) are respectively attached to the front wheel knuckles. End portions of tie rods 32 that are rotatably supported and extend from the steering gear box 23 to the left and right are connected via a ball joint 33.

  Here, the attachment structure of the suspension arm 30 according to the present invention will be described.

  As shown in FIGS. 6 and 8, two front and rear bosses 4g are integrally formed on each front portion of the left and right ends of the suspension member 4, and the lower surface of each boss 4g is a flat downward mounting surface 4g. -1. Each boss 4g has a screw hole 34 extending vertically. And as shown in FIG. 10, the recessed part 35 is formed between the attachment surfaces 4g-1 formed in the front and back at each front part of the left and right ends of the suspension member 4, and the attachment surface Ribs 4h extending in a direction perpendicular to 4g-1 are provided. Here, as shown in FIGS. 4 and 6, the left and right mounting surfaces 4g-1 of the suspension member 4 are formed in the vicinity of the left and right support columns 4b, which are front mounting portions of the suspension member 4 to the vehicle body. Yes.

  Also, as shown in FIGS. 6 to 9, flat rectangular cylindrical mounting portions 4 </ b> D are formed at the rear portions of the left and right ends of the suspension member 4, respectively. Here, as shown in detail in FIG. 7, the attachment portion 4D of the suspension arm 30 includes upper and lower attachment portion upper walls 4D1 and attachment portion lower walls 4D2, and front ends of attachment portion upper walls 4D1 and attachment portion lower walls 4D2. The mounting portion front wall 4D3 and the rear end of the mounting portion upper wall 4D1 and the mounting portion rear wall 4D4 connecting the rear ends of the mounting portion lower wall 4D2 are integrally formed in a rectangular cylindrical shape that opens in the left-right direction. .

  By the way, in this Embodiment, the space | interval of the attachment part front wall 4D3 and the attachment part rear wall 4D4 in the attachment part 4D of the suspension member 4 is set so that it may become wide toward the vehicle outer side. Specifically, the attachment portion front wall 4D3 is set to be on the front side toward the vehicle outer side, and the attachment portion rear wall 4D4 is set substantially parallel to the left-right direction of the vehicle.

  In addition, the suspension member 4 is disposed as a mounting portion for the vehicle body on the front side of the left and right end portions and on the rear side of the left and right end portions, respectively, on the support column 4b that is a front mounting portion that protrudes upward from the upper wall 4A. The mounting seat 4c, which is a rear mounting portion, is provided. The mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 of the mounting portion 4D are connected to the connecting portion of the upper wall 4A and the column 4b and the mounting seat 4c in a plan view. It is arranged along the direction of tying. Specifically, the attachment portion upper wall 4D1 and the attachment portion lower wall 4D2 of the attachment portion 4D are disposed between the connection portion of the upper wall 4A and the column 4b and the attachment seat 4c in plan view.

  Further, in the suspension member 4, the attachment portion upper wall 4D1 constituting the attachment portion 4D is disposed at substantially the same height as the upper wall 4A and connected to the upper wall 4A, and the attachment portion lower wall 4D2 is attached to the attachment seat. Arranged at substantially the same height as 4c and connected to the mounting seat 4c.

  As shown in FIG. 7, in the suspension member 4, the attachment portion front wall 4D3 and the upper wall 4A constituting the attachment portion 4D are connected by a peripheral flange 4j extending downward from the side edge of the upper wall 4A. The mounting portion rear wall 4D4 and the mounting seat 4c are connected by a connecting wall 4k. Specifically, the front surface of the attachment portion front wall 4D3 and the upper wall 4A are connected by a peripheral flange 4j, and the rear surface of the attachment portion rear wall 4D4 and the upper surface of the attachment seat 4c are connected by a connection wall 4k. The connecting wall 4k connects the upper wall 4A and the mounting seat 4c having different heights, and has a slope that becomes higher toward the center of the vehicle.

  In the attachment portion 4D of the suspension member 4, a circular bolt insertion hole 36 is formed in the attachment portion lower wall 4D2, and a columnar boss 4i is erected integrally with the attachment portion upper wall 4D1. Each boss 4i has a screw hole 37 extending vertically.

  On the other hand, as shown in FIG. 8, a cylindrical boss 30a that opens in the vehicle front-rear direction is integrally formed on the front side of the inner end of the left and right suspension arms 30 (only one is shown in FIG. 8). A bush 38 is pressed into the boss 30a in the vehicle front-rear direction. Here, as shown in FIG. 10, the bush 38 includes a shaft 38A and an outer cylinder 38B fixed to the suspension member 4, and an elastic member 38C such as rubber filled between the shaft 38A and the outer cylinder 38B. Flat fastening and fixing portions 38a are formed at both ends of the shaft 38A protruding from the outer cylinder 38B. A circular bolt insertion hole 39 is formed in each tightening fixing portion 38a of the shaft 38A.

  A circular fitting hole 30b is formed on the rear side of the vehicle width direction inner end portion of each suspension arm 30, and a bush 40 is press-fitted in the fitting hole 30b in the vertical direction. Although not shown, the bush 40 is configured by filling an elastic member such as rubber between an inner cylinder and an outer cylinder of an inner / outer double cylinder like the bush 38.

  Thus, each suspension arm 30 is attached to the suspension member 4 so as to be swingable up and down in the following manner.

  That is, as shown in FIGS. 8 and 9, a boss 30a formed on the front side in the vehicle width direction inner end portion of each suspension arm 30 and a bush 38 press-fitted into the boss 30a are arranged between the two front and rear mounting surfaces 4g-1. The flat fastening fixing portions 38a formed at both ends of the shaft 38A of the bush 38 are pressed into the front and rear mounting surfaces 4g-1 of the suspension member 4 from below to fit into the formed concave portions 35, and the fastening fixing portions 38a. The bolt 41 inserted from below into the bolt insertion hole 39 formed in the screw is screwed into the screw hole 34 formed in the mounting surface 4g-1 of the suspension member 4, so that the front end in the vehicle width direction of each suspension arm 30 is The side is attached so as to be swingable up and down around the shaft 38A of the bush 38.

  Further, the bush 40 press-fitted into the fitting hole 30b formed on the rear side of the inner end portion in the vehicle width direction of each suspension arm 30 is inserted into the rectangular cylindrical mounting portion 4D formed in the suspension member 4. The bolt 42 inserted from below into the bolt insertion hole 36 formed in the mounting portion lower wall 4D2 of the mounting portion 4D is passed through the inner cylinder of the bush 40, and the tip of the bolt 42 stands on the mounting portion upper wall 4D1 of the mounting portion 4D. By screwing into the screw hole 37 of the boss 4i provided, the rear side of the vehicle width direction inner end portion of each suspension arm 30 is attached so as to be able to swing up and down by elastic deformation of the elastic member of the bush 40.

  As described above, in the present embodiment, the mounting portion 4D of the suspension member 4 is integrally formed into a rectangular cylinder by the mounting portion upper wall 4D1, the mounting portion lower wall 4D2, the mounting portion front wall 4D3, and the mounting portion rear wall 4D4 by molding. Therefore, the productivity of the suspension member 4 is increased.

  Further, the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 constituting the upper and lower parallel mounting surfaces of the mounting portion 4D of the suspension member 4 can be more easily deformed than other portions, so that a gap for inserting a bush is provided. The suspension arm 30 can be absorbed by the bending deformation of the upper and lower mounting surfaces (the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2), and the suspension arm 30 can be securely attached to the mounting portion 4D of the suspension member 4 without sacrificing the assembling property. It can be fastened and fixed to.

  Further, in the present embodiment, since the interval between the attachment portion front wall 4D3 and the attachment portion rear wall 4D4 in the attachment portion 4D of the suspension member 4 is set to increase toward the vehicle outer side, it is easy to remove the mold during molding. As a result, the productivity of the suspension member 4 is enhanced, the assembly of the suspension arm 30 (the workability of inserting the suspension member 4 into the mounting portion 4D) is enhanced, and the degree of freedom of the shape of the suspension arm 4 is further increased. Enhanced. Since the attachment portion front wall 4D3 and the attachment portion rear wall 4D4 constituting the attachment portion 4D of the suspension member 4 are not parallel, the attachment rigidity of the suspension arm 30 is enhanced.

  Further, the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 constituting the mounting portion 4D of the suspension member 4 have a high rigidity direction (direction in which the connection portion between the upper wall 4A and the column 4b and the mounting seat 4c are connected in plan view). Therefore, the mounting rigidity of the suspension arm 30 can be further increased.

  Furthermore, in the present embodiment, the attachment portion upper wall 4D1 constituting the attachment portion 4D of the suspension member 4 is disposed at substantially the same height as the upper wall 4A and connected to the upper wall 4A, and the attachment portion lower wall 4D2 Is disposed at substantially the same height as the mounting seat 4c and connected to the mounting seat 4c, so that the suspension member 4 is mounted on the mounting portion as a surface substantially continuous with the support 4b and the mounting seat 4c. The wall 4D1 and the mounting portion lower wall 4D2 are arranged, the rigidity in the direction parallel to each surface of the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 is increased, and the mounting rigidity of the suspension arm 4 is increased. The rigidity in the direction perpendicular to the surfaces of the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 (the tightening direction of the bush 38) is kept relatively low to facilitate bending deformation in that direction. And absorbed by bending deformation of the mounting portion on the wall 4D1 and attached subordinate wall 4D2 becomes possible fastened suspension arm 30 there is no play the.

  In the present embodiment, the mounting portion front wall 4D3 and the mounting portion rear wall 4D4 constituting the mounting portion 4D of the suspension member 4 are prevented from falling by the peripheral flange 4j or the connecting wall 4k. Stiffness is increased.

  Further, the rigidity in the direction parallel to the respective surfaces of the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 can be effectively increased by the peripheral flange 4j and the connecting wall 4k. These mounting portion upper wall 4D1 and mounting portion lower wall 4D2 It is possible to suppress the movement in the deviation direction. The rigidity in the direction perpendicular to the surfaces of the attachment portion upper wall 4D1 and the attachment portion lower wall 4D2 (the tightening direction of the bush 38) can be kept relatively low.

DESCRIPTION OF SYMBOLS 1 Apron side member 4 Aluminum suspension member 4A Upper wall of suspension member 4B Front wall of suspension member 4C Rear wall of suspension member 4D Mounting part of suspension arm 4D1 Mounting part upper wall 4D2 Mounting part lower wall 4D3 Mounting part front wall 4D4 Mounting part Rear wall 4b Post (front mounting part)
4c Mounting seat (rear mounting part)
4j Peripheral flange of suspension member 4k Connecting wall of suspension member 30 Suspension arm 38 Bush S Engine room

Claims (5)

An aluminum suspension member integrally formed of an aluminum alloy and having a substantially horizontal upper wall, and a cross-sectional shape having a lower portion opened by a front wall and a rear wall extending downward from front and rear edges of the upper wall;
A suspension arm that is swingably attached to the attachment portion of the suspension member via a bush provided at an end;
A suspension arm mounting structure for a vehicle having:
The mounting portion of the suspension member is disposed substantially horizontally above and below the bush to fix the bush, and the front wall of the mounting portion upper wall and the front wall of the mounting portion lower wall. The mounting part front wall and the mounting part upper wall and the mounting part rear wall connecting the rear ends of the mounting part front wall and the mounting part lower wall are integrally formed into a rectangular cylinder opening in the left-right direction. A suspension arm mounting structure for a vehicle.   2. The suspension arm mounting structure for a vehicle according to claim 1, wherein a distance between the front wall of the mounting portion and the rear wall of the mounting portion in the mounting portion of the suspension member is set to increase toward the vehicle outer side. The suspension member is provided with a front mounting portion projecting upward from the upper wall on the front side of the left and right end portions as a mounting portion to the vehicle body, and a rear mounting portion disposed on the rear side of the left and right end portions,
The mounting portion upper wall and the mounting portion lower wall of the mounting portion are arranged along a direction connecting the connecting portion of the upper wall and the front mounting portion and the rear mounting portion in plan view. Or the suspension arm attachment structure of the vehicle of 2 description.   In the suspension member, the upper wall of the attachment portion is arranged at the same height position as the upper wall and connected to the upper wall, and the lower wall of the attachment portion is arranged at the same height position as the rear attachment portion. 4. The suspension arm mounting structure for a vehicle according to claim 3, wherein the suspension arm mounting structure is connected to the rear mounting portion. In the suspension member, the attachment portion front wall and the upper wall are connected by a peripheral flange extending from a side edge of the upper wall, and the attachment portion rear wall and the rear attachment portion are connected by a connection wall. 5. The suspension arm mounting structure for a vehicle according to claim 4, wherein the suspension arm mounting structure is a vehicle.

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