JP5633686B2 - Vehicle suspension arm mounting structure - Google Patents

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 such a configuration, the brackets constituting the left and right mounting portions of the suspension member are formed with vertical walls opposed to each other in the front and rear, and the bushes provided on the left and right suspension arms are interposed between the vertical walls. The left and right suspension arms are swingably supported at the left and right ends of the suspension member by arranging and tightening the bolts penetrating the vertical wall and the inner cylinder of the bush.

  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 (for example, see Patent Document 1).

  In general, it is necessary to increase the rigidity of the suspension member in order to ensure high running stability and rigidity in the vehicle, but the suspension member absorbs impact energy from the front of the vehicle in order to increase the shock absorption of the vehicle. A structure is required.

  However, since the aluminum alloy has a characteristic that the elongation is smaller than that of iron, the aluminum suspension member has a problem that the impact energy absorbability is inferior to that of the sheet metal suspension member.

  Therefore, in the past, a device has been devised to increase the impact absorbability of the aluminum suspension member by using an aluminum alloy having a high elongation rate (ductility) or heat treatment after forming the product. Patent Document 2 proposes a method of thinly forming a portion requiring elongation with respect to an impact by adjusting a mold temperature at the time of forming an aluminum suspension member.

  In Patent Document 3, a first reinforcing rib that connects the front side mounting portion and the rear side mounting portion is provided on both sides of the cast suspension member, and the first reinforcing rib is a plurality of second reinforcing ribs. While reinforcing the cast suspension member with respect to the input from the suspension arm, a thin portion is formed in a triangular shape in a plan view on the front side of the rear mounting portion, and a crash bead is formed in the thin portion. Therefore, a configuration for improving the energy absorption performance has been proposed.

JP 2003-127892 A JP 2005-059813 A JP 2005-014728 A

  However, the conventional methods of increasing the shock absorption of aluminum suspension members by using aluminum alloys with high elongation (ductility), heat treatment after product molding, and adjusting mold temperature at the time of molding, etc., do not have material costs or heat treatment costs. In addition to being bulky, there is a problem that the product distortion after heat treatment needs to be corrected, resulting in a decrease in productivity and an increase in manufacturing cost.

  Further, the configuration proposed in Patent Document 3 has a problem that the mold structure is complicated because the first reinforcing rib and a plurality of second reinforcing ribs for reinforcing the first reinforcing rib are necessary.

  The present invention has been made in view of the above problems, and the object of the present invention is to easily form an impact absorbing portion that enhances impact absorption while minimizing the decrease in rigidity of an aluminum suspension member, and to form aluminum. An object of the present invention is to provide a suspension arm mounting structure for a vehicle that can improve the productivity of a suspension member made of a vehicle.

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. A mounting part front wall and a rear end of the mounting part upper wall and a mounting part rear wall connecting the rear ends of the mounting part lower wall are integrally formed into a rectangular cylinder that opens in the left-right direction ,
A bolt insertion hole through which a bolt for fixing the inner cylinder of the bush is inserted is formed in the upper wall of the mounting portion and the lower wall of the mounting portion in the mounting portion of the suspension member, and between the bolt insertion hole and the front wall of the mounting portion. Is set to be larger than the distance between the bolt insertion hole and the rear wall of the mounting portion, so that the portion between the bolt insertion hole and the front wall of the mounting portion is an easily deformable portion .

According to a second aspect of the present invention, in the first aspect of the present invention, a plurality of beads extending in the vehicle width direction are provided on the upper wall of the suspension member at a position corresponding to the easily deformable portion in the longitudinal direction of the vehicle. It is formed.

According to a third aspect, the invention described in claim 2, wherein the bead of two upper wall of the suspension member is formed in the longitudinal direction of the vehicle, than the thickness of other portions of the wall thickness between both of the beads It is also characterized by being made thinner.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the front wall of the attachment portion of the suspension member is formed in a slope shape that is inclined toward the vehicle front side toward the left and right outer sides. Features.

  According to the first aspect of the present invention, the attachment portion formed on the suspension member is formed in a rectangular cylindrical shape opening in the left-right direction, and the attachment portion does not have the vertical wall portions on the left and right sides. The parallel upper wall of the mounting portion and the lower wall of the mounting portion are easily deformed by the compressive force in the vehicle front-rear direction, and the impact from the vehicle front-rear direction can be effectively absorbed by this deformation. The amount of deformation of the upper wall of the mounting portion and the lower wall of the mounting portion can be adjusted by adjusting the lengths of the upper wall of the mounting portion and the lower wall of the mounting portion in the vehicle front-rear direction, thereby improving the shock absorbing performance of the suspension member. It can be adjusted easily. In addition, the rectangular cylindrical mounting portion can be formed at the same time when the aluminum suspension member is formed, and the productivity of the suspension member is enhanced. Since the suspension member's rectangular cylindrical mounting portion maintains high rigidity without being deformed unless it receives an impact, the rigidity of the entire suspension member is kept high, and high running stability and a sense of rigidity are ensured for the vehicle. The

Further, according to the first aspect of the present invention, the distance between the bolt insertion hole formed in the upper wall of the mounting portion and the lower wall of the mounting portion and the front wall of the mounting portion is set in the mounting portion of the suspension member. Since the easily deformable portion is formed in the portion between the bolt insertion hole and the front wall of the mounting portion by setting the distance larger than the distance between the rear walls, the suspension member is disposed in front of the engine or the speed change by the frontal collision of the vehicle. When subjected to an impact load from the machine to the rear of the vehicle, the easily deformable portion of the suspension member is compressed between the front wall of the bolt (bolt for inserting the suspension arm to the suspension member through the bolt insertion hole) Since the impact energy is absorbed by this compression deformation, the shock absorbing performance of the suspension member is enhanced.

According to the second aspect of the present invention, the upper wall of the suspension member is easily compressed and deformed by the plurality of beads formed in the frontal collision of the vehicle. Combined with the effect, the shock absorbing performance of the suspension member is further enhanced.

According to the invention described in claim 3, since the thickness between the two beads formed on the upper wall of the suspension member is made thinner than the thickness of other portions, the suspension member when the vehicle receives an impact load. The upper wall is more easily deformed, and the impact energy is more effectively absorbed by the deformation of the upper wall.

According to the fourth aspect of the present invention, since the front wall of the attachment portion of the suspension member is formed in a slope shape so as to incline toward the vehicle front toward the left and right outer sides, the distance between the bolt insertion hole and the front wall of the attachment portion is fixed. It becomes longer toward the outside which is the open end edge of the part, and the deformation by the impact load of the easily deformable part between the bolt insertion hole and the front wall of the mounting part becomes easier, and the shock absorbing performance of the suspension member is effectively enhanced. .

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. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a fragmentary perspective view of a suspension member. It is a fragmentary sectional side view which shows the suspension arm attachment structure which concerns on this invention. 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.

  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 sectional view taken along line AA of FIG. 3, FIG. 8 is a partial perspective view of the suspension member, and FIG. FIG. 10 is an exploded perspective view showing the suspension arm mounting structure, FIG. 11 is a perspective view of the mounting portion showing the assembling procedure of the suspension arm as viewed obliquely below, and FIG. 12 shows the suspension arm mounting structure. It is a partial sectional side view shown.

  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 (see FIG. 5) extending from the engine (not shown) 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 both left and right ends of the upper wall 4A of the suspension member 4 made of aluminum, a support column 4b that constitutes a vehicle body mounting portion is provided upright, and as shown in FIGS. 3 and 4, at the upper end portion of each support column 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 to the vehicle body 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. Thus, each mounting seat 4c is provided with a circular bolt insertion hole 19 extending vertically.

  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 4de 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.

  Also, as shown in FIGS. 2, 10 and 11, front and rear of the inner end of a pair of left and right suspension arms 30 (only one is shown in the figure) having a Y-shape in plan view at the left and right ends of the suspension member 4. 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, 10 and 12, two front and rear bosses 4g are integrally formed at the front portions of the left and right ends of the suspension member 4, and the lower surface of each boss 4g is flat and downward. The mounting surface 4g-1 is configured. Each boss 4g has a screw hole 34 extending vertically. And as shown in FIG. 12, 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 attachment surfaces 4 g-1 of the suspension member 4 are formed in the vicinity of the left and right support columns 4 b that are attachment portions of the suspension member 4 to the vehicle body. .

  As shown in FIGS. 6, 8, and 9, attachment portions 4 </ b> D for attaching the flat rectangular cylindrical suspension arms 30 are formed at the rear portions of the left and right ends of the suspension member 4. Here, as shown in detail in FIGS. 8 and 9, each mounting portion 4D includes a mounting portion upper wall 4D1 and a mounting portion lower wall 4D2 disposed substantially horizontally above and below, and these mounting portion upper walls 4D1. The front end of the mounting portion and the front end of the mounting portion lower wall 4D2 are connected in the left-right direction by 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. It is integrally formed in a rectangular tube shape. 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. Further, 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 substantially the same height as the attachment seat 4c. It is arranged at a position and connected to the mounting seat 4c. The front surface of the attachment portion front wall 4D3 and the upper wall 4A are connected by a peripheral flange extending downward from the side edge of the upper wall 4A, and the rear surface of the attachment portion rear wall 4D4 and the upper surface of the attachment seat 4c are connected. Connected by walls. The connecting wall 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.

  A circular bolt insertion hole 36 is formed in the mounting portion lower wall 4D2 constituting the mounting portion 4D, and a columnar boss 4i is erected integrally on the upper mounting portion upper wall 4D1. Each boss 4i is provided with a screw hole (bolt insertion hole) 37 extending vertically.

  On the other hand, as shown in FIG. 10, a cylindrical boss 30a that opens in the vehicle front-rear direction is integrally formed on the front side of the vehicle width direction inner end of each of the left and right suspension arms 30 (only one is shown in FIG. 10). A bush 38 is press-fitted in the lateral direction into the boss 30a. Here, as shown in FIG. 12, 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. Here, as shown in FIG. 9, the bush 40 is configured by filling an elastic member 40C such as rubber between an inner cylinder 40A and an outer cylinder 40B having an inner and outer double cylinder shape.

  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. 10 and 11, a boss 30a formed on the front side of the inner end portion in the vehicle width direction of each suspension arm 30 and a bush 38 press-fitted thereto 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, a bushing 40 press-fitted into a fitting hole 30b formed on the rear side of the vehicle width direction inner end portion of each suspension arm 30 is a rectangular cylindrical mounting portion formed on the suspension member 4 as shown in FIG. 4D is inserted into the bolt insertion hole 36 formed in the attachment portion lower wall 4D2 of the attachment portion 4D from below, and the bolt 42 is passed through the inner cylinder 40A of the bush 40, and the tip of the bolt 42 is inserted into the attachment portion 4D. By screwing into the screw hole 37 of the boss 4i erected on the mounting portion upper wall 4D1, the rear side in the vehicle width direction of each suspension arm 30 can swing up and down by elastic deformation of the elastic member 40C of the bush 40. Attached to.

  Here, in the present embodiment, as shown in FIG. 9, the distance L1 between the bolt 42 (bolt insertion hole 36 and screw hole 37) and the mounting portion front wall 4D3 in the mounting portion 4D of the suspension member 4 is the bolt 42. And a distance L2 between the mounting portion rear wall 4D4 (L1> L2), and the portion between the bolt 42 and the mounting portion front wall 4D3 is an easily deformable portion that is easily deformed by an external force (impact load). It is configured. Then, as shown in FIG. 8, with respect to the width of the mounting portion lower wall 4D2 in the mounting portion 4D of the suspension member 4, the width b1 of the portion between the bolt 42 (bolt insertion hole 36 and screw hole 37) and the mounting portion front wall 4D3. Is set narrower than the width b2 of the part between the bolt 42 and the mounting portion rear wall 4D4 (b1 <b2). Further, as shown in FIG. 9, a bent portion 4j that is bent downward to be a starting point of deformation is formed at a portion between the bolt insertion hole 36 (bolt 42) of the lower wall 4D2 of the mounting portion and the front wall 4D3 of the mounting portion. Has been. More specifically, the fastening fixing surface around the bolt insertion hole 36 is formed substantially horizontally, whereas the portion between the bolt insertion hole 36 and the mounting portion front wall 4D3 is formed by bending of the bent portion 4j. It becomes an inclined surface which becomes lower as it goes forward, and the connection part of the front end of attachment part lower wall 4D2 and the lower end of attachment part front wall 4D3 is formed in the curved surface shape.

  In this embodiment, as shown in FIGS. 3 and 7, the suspension member 4 is positioned above the suspension member 4 at a position corresponding to the easily deformable portion between the bolt 42 and the mounting portion front wall 4D3 in the longitudinal direction of the vehicle. The wall 4A is formed with two front and rear beads 4k extending in the vehicle width direction. Here, as shown in FIG. 7, the thickness t1 between the beads 4k of the upper wall 4A of the suspension member 4 is set to be thinner than the thickness t2 of other portions (t1 <t2).

  Further, in the present embodiment, as shown in FIG. 8, the attachment portion front wall 4D3 of the suspension member 4 is formed in a slope shape that is inclined toward the vehicle front side toward the left and right outer sides.

  In the above, in the present embodiment, the attachment portion 4D formed on the suspension member 4 is formed in a rectangular cylindrical shape that opens in the left-right direction, and the attachment portion 4D does not have vertical wall portions on the left and right sides. The upper and lower parallel mounting portion upper wall 4D1 and mounting portion lower wall 4D2 are easily deformed by the compressive force in the vehicle longitudinal direction, and this deformation can effectively absorb the impact from the vehicle longitudinal direction. Then, by adjusting the lengths of the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 in the vehicle front-rear direction, the deformation amount of the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 can be adjusted. The shock absorbing performance can be easily adjusted.

  In particular, in the present embodiment, the distance L1 between the bolt 42 (bolt insertion hole 36 and screw hole 37) and the mounting portion front wall 4D3 in the mounting portion 4D of the suspension member 4 is set between the bolt 42 and the mounting portion rear wall 4D4. Distance L2 (L1> L2), and the portion between the bolt 42 and the front wall 4D3 of the mounting portion is configured as an easily deformable portion that is easily deformed by an external force (impact load). 4 receives an impact load F (see FIG. 9) to the rear of the vehicle from an engine or transmission (not shown) arranged in front of the suspension member 4, the easily deformable portion of the suspension member 4 is bolt 42 (bolt insertion hole 36 and 9 is compressed and deformed between the bolts 37 through the screw holes 37 and bolts for attaching the suspension arm 30 to the suspension member 4 as shown by broken lines in FIG. Shock absorbing capacity of the suspension member 4 is increased in order to impact energy is absorbed by the contraction deformation. Then, due to the compressive deformation of the easily deformable portion of the suspension member 4, the attachment portion front wall 4D3 strokes backward by Δx shown in FIG. In the present embodiment, as described above, the bent portion 4j that bends downward as a starting point of deformation at the portion between the bolt insertion hole 36 (bolt 42) of the mounting portion lower wall 4D2 and the mounting portion front wall 4D3. 9 (see FIG. 9), the mounting portion upper wall 4D1 and the mounting portion lower wall 4D2 are connected by the bolt 42, but the easily deformable portion is bent as shown by the broken line in FIG. 9 starting from the bending portion 4j. Deform.

  Further, since the upper wall 4A of the suspension member 4 is easily compressed and deformed by the two beads 4k formed on the front wall of the vehicle as described above, the shock absorption due to the compressive deformation of the easily deformable portion of the suspension member 4 is achieved. Combined with the effect, the shock absorbing performance of the suspension member 4 is further enhanced. In the present embodiment, as shown in FIG. 7, the wall thickness t1 between the two beads 4k formed on the upper wall 4A of the suspension member 4 is made thinner than the wall thickness t2 of other parts (t1). <T2) When the vehicle receives the impact load F, the upper wall 4A of the suspension member 4 is further easily deformed, and the impact energy is more effectively absorbed by the deformation of the upper wall 4A.

  Furthermore, in the present embodiment, as described above, the mounting portion front wall 4D3 of the suspension member 4 is formed in a slope shape so as to incline toward the vehicle front side toward the left and right outer sides, so that the space between the bolt 42 and the mounting portion front wall 4D3. The distance L1 increases toward the outside, which is the open end edge of the mounting portion 4D, and the deformation of the easily deformable portion between the bolt 42 and the mounting portion front wall 4D3 due to the impact load is further facilitated. Performance is effectively increased.

  In addition, since the aluminum suspension member 4 according to the present embodiment can be formed with a rectangular cylindrical mounting portion 4D at the same time as the molding thereof, the productivity of the suspension member 4 can be improved. . Since the rectangular cylindrical mounting portion 4D of the suspension member 4 is not deformed unless it receives an impact and maintains high rigidity, the rigidity of the suspension member 4 as a whole is kept high, and the vehicle has high running stability and rigidity. Is secured.

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 Suspension Member Mounting 4D1 Suspension Member Mounting Upper Wall 4D2 Suspension Member Mounting Lower Wall 4D3 Suspension 4D4 Suspension member rear wall 4j Suspension member bend 4k Suspension member bead 30 Suspension arm 36 Suspension member bolt insertion hole 37 Suspension member screw hole (bolt insertion hole)
38, 40 Bush 42 Bolt L1 Distance between the bolt insertion hole of the suspension member and the front wall of the attachment portion L2 Distance between the bolt insertion hole of the suspension member and the rear wall of the attachment portion t1 Meat between the beads on the suspension member upper wall Thickness t2 Thickness other than between the beads on the suspension member upper wall S Engine room

Claims (4)

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. A mounting part front wall and a rear end of the mounting part upper wall and a mounting part rear wall connecting the rear ends of the mounting part lower wall are integrally formed into a rectangular cylinder that opens in the left-right direction ,
A bolt insertion hole through which a bolt for fixing the inner cylinder of the bush is inserted is formed in the upper wall of the mounting portion and the lower wall of the mounting portion in the mounting portion of the suspension member, and between the bolt insertion hole and the front wall of the mounting portion. Is set to be larger than the distance between the bolt insertion hole and the rear wall of the mounting portion, so that the portion between the bolt insertion hole and the front wall of the mounting portion is an easily deformable portion. Suspension arm mounting structure. The vehicle suspension arm according to claim 1, wherein a plurality of beads extending in the vehicle width direction are formed on an upper wall of the suspension member at a position corresponding to the easily deformable portion in the longitudinal direction of the vehicle. Mounting structure. 3. The vehicle suspension according to claim 2, wherein the two beads are formed in the vehicle front-rear direction on the upper wall of the suspension member, and the thickness between the two beads is made thinner than the thickness of other portions. Arm mounting structure. The suspension arm mounting structure for a vehicle according to any one of claims 1 to 3, wherein a front wall of the mounting portion of the suspension member is formed in a slope shape that is inclined toward the front of the vehicle toward the left and right outer sides .

Images