JP3089988B2 - Anchor support mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor support mounting device used for a suspension mounted on a ladder frame used in a vehicle having a frame and a body, and more particularly, to a vehicle having a frame provided with a widened portion. Anchor mounting device to be used.

[0002]

2. Description of the Related Art Conventionally, many vehicle bodies such as buses and trucks are formed by connecting a lower frame and an upper body. Here, an unsprung member and a power plant including an engine and a transmission are mounted on the frame of the vehicle body, and the body side is mounted on the upper portion thereof via a mount member. Usually, this type of frame is formed by a pair of left and right side members extending in the longitudinal direction of the vehicle and a plurality of cross members connecting the side members, and has a ladder shape in plan view. One example of this ladder-type frame is provided with a pair of right and left straight side members and a cross member that is straight in the vehicle width direction as disclosed in Japanese Utility Model Laid-Open No. 3-40168.

In many vehicles, many of the vehicle body components are formed symmetrically, thereby facilitating the manufacture of each part, setting the position of the center of gravity on the vehicle body center line, and displacing the vehicle body to one of the left and right sides during braking. To prevent them from doing so. In particular,
Suspensions and power transmission systems are often arranged along the vehicle centerline, and the ladder frame that supports them is usually formed symmetrically with respect to the vehicle centerline.

[0004] A power plant including an engine vertically installed in the vehicle longitudinal direction and a transmission integrally connected to the engine is supported by a frame as a vehicle body base. Here, there is known a vertical engine in which the longitudinal direction of the engine body is oriented in the front-rear direction of the vehicle body, in which the side wall along the longitudinal direction of the engine body is inclined in the vehicle width direction. In the case of a power plant that includes a vertically mounted tilt engine, the upper end of the engine body is kept at a relatively low position, which makes it easier to adopt a body design with a reduced vehicle height and lower the floor of the body. . However, in this case, the engine body is mounted inclined, and as a result, one of the pair of left and right side frames supporting the power plant is protruded in the vehicle width direction to form a widened portion, and the accommodation space is set in the vehicle width direction. The power plant will be supported on the frame by being enlarged.

[0005] By the way, 4 as a vehicle suspension.
Independent suspension suspensions are frequently used. In particular,
A wishbone type suspension as shown in FIG. 8 is frequently used. Here, a front right suspension Sr is shown. Here, a knuckle 2 for pivotally supporting the wheels 1 and a bracket 6 on a frame side member 5 side forming a vehicle body base are pinned at four points via an upper arm 3 and a lower arm 4. Be combined. The upper end of the knuckle 2 and the spring receiver 7 of the bracket 6 oppose each other in the vertical direction, and are connected to each other via an air spring 8 so as to be able to come and go. Further, the rotating end side of the lower arm 4 and the upper part of the bracket 6 are connected by a shock absorber (not shown).

Here, the center of rotation of the lower arm 4 is integrally connected to a torsion bar 9 which is pivotally supported by the lower pivot 601 of the bracket 6 and is long in the vehicle longitudinal direction (perpendicular to the paper). The torsion bar 9 is arranged in parallel with the frame side member 5, and an anchor arm (not shown) is integrally attached to the other end (not shown). The other end of the torsion bar 9 is pivotally attached to a portion on the opposed frame side member 5 via a bracket (not shown), and an anchor arm located near the pivotal support gives the torsion bar 9 a predetermined torsion angle. It is connected to the side member 5. As a result, an elastic force corresponding to the torsional displacement of the torsion bar 9 can be applied as a spring force of the suspension Sr, and a suspension having a relatively low spring constant and good ride comfort is configured.

[0007]

When a vehicle uses a suspension having a torsion bar 9, and particularly when a power plant including a vertical type inclined engine is mounted, a pair of left and right supporting the power plant is provided. One of the side frames is protruded in the vehicle width direction to form a widened portion, thereby securing a power plant housing space protruding in the vehicle width direction at the same portion. On the other hand, when the suspension of this vehicle is of a torsion bar type, there is no problem on the bracket 6, upper arm 3 and lower arm 4 side of the suspension Sr, but the mounting portion side of the anchor arm of the torsion bar 9 faces the widened portion of the frame side member. Resulting in.

As a result, in a vehicle employing a frame having a widened portion, the left and right anchor support mounting portions facing the widened portion cannot be set as a structure symmetrical to the left and right opposite side anchor support mounting portions. The same device as the conventional device cannot be used as it is, resulting in a complicated structure and high cost.

An object of the present invention can be adopted in a vehicle suspension employing a frame provided with a widened portion, has a symmetrical structure, can use left and right common parts, can avoid complication of the structure, and can reduce the cost. An object of the present invention is to provide an anchor support mounting device that is easy to use.

[0010]

In order to achieve the above-mentioned object, a first aspect of the present invention comprises a pair of frame side members which are connected to both ends of a cross member and have a predetermined width and extend in the longitudinal direction of the vehicle. A suspension member having a torsion bar, wherein the one frame side member is formed with a widened portion near the suspension, and a partial member is formed to extend before and after the widened portion; A reinforcing member that forms a cross section of a closed cross-section, a branch portion of the reinforcing member branched from the widening portion to one end of the partial member, and a branch portion of the widening portion branched from the reinforcing member to the portion. A predetermined amount from one end of the member is coupled to a portion located on the other end side, and the branch portion of the widening portion and the branch portion of the reinforcing member Wherein the attachment portion of the anchor support of the torsion bar is formed into a straight shape extending portion of the partial member of standing between.

According to a second aspect of the present invention, in the anchor support mounting device according to the first aspect, the branch member of the widening portion, the branch portion of the reinforcing member, and the partial member located between the two branch portions. A triangle is formed by the straight extension portion.

According to a third aspect of the present invention, in the anchor support attaching apparatus according to the first aspect, the pivot bracket of the torsion bar is integrally connected to a lower wall surface of the straight extension of the partial member. I do.

According to a fourth aspect of the present invention, in the anchor support mounting device of the third aspect, the pivot bracket has a main portion having an inverted U-shaped cross section and is integrally connected to the torsion bar in the main portion. The torsion bar anchor arm is swingably supported.

[0014]

According to the first aspect of the present invention, one of the frame side members has a widened portion formed near the suspension, and has a partial member extending before and after the widened portion.
A reinforcing member that forms a cross section of the widened portion into a closed cross section; a branched portion of the reinforcing member branched from the widened portion at one end of the partial member; and a branched portion of the widened portion branched from the reinforcing member at one end of the partial member. A predetermined amount is coupled to the part located on the other end side, and the attachment part of the anchor support of the torsion bar is formed in the straight extension part of the partial member located between the branch part of the widening part and the branch part of the reinforcing member. Here, since the straight extension portion where the branch portion of the widened portion and the branch portion of the reinforcing member are connected to each other appropriately extends from one end of the partial member, it is supported by the same portion. The degree of freedom in designing the mounting portion of the anchor support is increased.

According to the second aspect of the present invention, in the anchor support attaching apparatus according to the first aspect, the branch portion of the widened portion, the branch portion of the reinforcing member, and the linear extension of the partial member located between the two branch portions. Since the triangle is formed by the parts, the mounting part of the anchor support is installed in the triangle, and the rigidity of the mounting part can be sufficiently enhanced.

According to the third aspect of the present invention, in the anchor support attaching apparatus according to the first aspect, the pivot bracket of the torsion bar is integrally connected to the lower wall surface of the straight extension of the partial member. The pivot bracket and the partial member can be directly connected.

According to a fourth aspect of the present invention, in the anchor support attaching device according to the third aspect, the pivot bracket has a main portion having an inverted U-shaped cross section and is integrally connected to the torsion bar in the main portion. Since the bar anchor arm is swingably supported, the torsion bar anchor arm can be easily displaced to a desired torsion angle and fixed.

[0018]

1 and 2 show a ladder-type frame of a small bus equipped with the anchor support mounting device of the present invention. Here, the ladder frame is a pair of left and right side members 11 and 12 extending in the vehicle longitudinal direction X, a plurality of cross members 13 to 18 connecting these members, and a rectangular frame-shaped front extension frame 3.
0, and form a ladder shape in plan view. In particular, the widened portion 22 is formed in the right frame side member 12. The left frame side member 11 extends substantially straight in the longitudinal direction X of the vehicle, has a U-shaped cross section, is formed of a relatively thick steel plate, and is sufficiently stiffened.

The right frame side member 12 is formed at a position substantially at the center in the longitudinal direction X of the vehicle.
2 and a front member 20 and a rear member 21 disposed at the front and rear ends of the widened portion. The cross section of the front member 20 and the rear member 21 are U-shaped, and are formed of a relatively thick steel plate. The rigidity is enhanced, and they are sequentially joined together. Here, as shown in FIG. 2, this ladder-type frame device is provided with a body cross member 25, which is a long joist member in the vehicle width direction Y, above a pair of left and right side members 11, 12 extending substantially horizontally. Place via The body cross members 25 are sequentially arranged at predetermined intervals in the vehicle longitudinal direction X, and the dimensions of the body cross members 25 are adjusted in the height direction so that the floor surface formed by the floor member 38 is a flat floor surface without irregularities.

The ladder-type frame device shown in FIG. 1 includes a front ladder-type frame portion G1, a high-rigidity ladder-type frame portion G2 on the front side of the vehicle body, and a ladder-type frame portion G3 on the rear side of the vehicle body.
And a structure in which they are sequentially and integrally joined along the vehicle longitudinal direction X. The front ladder-shaped frame portion G1 is configured by arranging the right front member 20 and the front portion 111 of the left frame side member 11 in parallel in the vehicle longitudinal direction X, and arranging them in a rectangular frame-shaped front extension frame 30 and a front cross member. 13 to form a ladder-type frame structure.

Here, the rectangular frame-shaped front extension frame 30 has a U-shaped cross section, a relatively large flange portion, and is formed with sufficient rigidity itself. In the front extension frame 30, the left front portion 111 and the right front member 20 are overlapped on the left and right ends of the rear end portion 301, and are integrally welded. The front extension frame 30 has a rear end located sufficiently ahead of the front axle center position FAC as shown in FIG. 1 and works effectively to enhance the rigidity of the front end on the body side.
The overall length of the pair of left and right side members 11 and 12 itself is suppressed to reduce manufacturing costs. The rear ladder-shaped frame portion G3 is configured by arranging the right rear member 21 and the rear portion 113 of the left frame side member 11 side by side in the vehicle longitudinal direction X, and arranging these three front and rear rear cross members 17.
And a pair of front and rear bar-shaped auxiliary cross members 18 integrally joined to hold a ladder-type frame structure.

The front ladder frame portion G1 and the rear ladder frame portion G3 are both formed symmetrically with respect to the vehicle center line L0 (see FIG. 1) in plan view. On the other hand, in the high rigidity ladder type frame portion G2, the intermediate portion 112 of the left frame side member 11 and the wide portion 22 at the center of the right frame side member 12 are arranged side by side in the vehicle longitudinal direction X. The pair of front and rear cross members 14 and 15 and the engine support 16 are integrally connected to form a highly rigid ladder-type frame structure.

Here, the middle portion 112 of the left frame side member 11 and the widened portion 22 of the right frame side member 12
And the front and rear cross members 14 and 15 are integrally connected to each other in a state of forming a loop by welding. Each of these members has a uniform U-shaped cross section (see FIGS. 3 and 4),
The loop-shaped portion is made of a relatively thick steel plate, and the rigidity is sufficiently enhanced. Here, as shown in FIGS. 3 to 6, the widened portion 22 has a U-shaped cross section, and a reinforcing member 23 having an inverted U-shaped cross section is superimposed on a portion near the center of the widened portion 22. The main parts are welded to each other, thereby forming a long front and rear closed cross section, thereby enhancing the rigidity of a portion near the center position of the widened part 22.

The widened portion 22 has a front inclined portion 221 and a front joining portion 222 formed on the front side thereof, and the front joining portion 222 is welded to the front member 20. A rear inclined portion 223 and a rear joining portion are attached to the rear side. 224 are respectively formed to extend, and the rear joint portion 22 is formed.
4 is welded to the rear member 21. Here front member 2
0, a straight extending portion 201 is formed to extend rearward by a length a at the rear end, and a front bent extending portion 23 of the reinforcing member 23 is formed at the rear end.
1 is superposed and welded. A straight extension 211 is formed at the front end of the rear member 21 so as to extend forward by a length a, and a rear bent extension 232 of the reinforcing member 23 is overlapped and welded to the front end. The front and rear straight extension portions 201 and 211
The alligator-type connecting ends of the front and rear cross members 14, 15 extending in the vehicle width direction are overlapped and welded. Here, the left ends, which are the other ends of the front and rear cross members 14, 15, are welded to the intermediate portion 112 of the left frame side member 1, respectively, to enhance the rigidity of the ladder-shaped frame portion G2.

In the ladder-type frame of FIG. 1 as described above, the suspension is mounted at the center position FAC of the front axle and the center position RAC of the rear axle. This suspension is a four-wheel independent suspension of the wishbone type. In particular, the front suspensions Sr and Sl adopt a torsion bar type suspension configuration as described with reference to FIG. Here, the front suspension Sr, Sl
Is symmetrical, except that the anchor support mounting position is different. Here, the right front suspension Sr will be mainly described.

As described with reference to FIG. 8, the knuckle 2 for pivotally supporting the wheel 1 (see FIG. 8) and the bracket 6 on the right frame side member 12 are connected to the right front suspension Sr via the upper arm 3 and the lower arm 4 at four points. Pin-coupled,
In particular, the front end of the torsion bar 9 is integrally connected to the base end of the lower arm 4. As shown in FIG. 7, a front anchor arm 27 is spline-fitted to the front end of the torsion bar 9,
The front end side of the lower arm 4 is bolted to the flange of the front anchor arm 27. The pivot end 901 of the torsion bar 9 facing the front end side of the lower arm 4 is pivotally attached to the pivot member 28 extending from the bracket 6 side, whereby the lower arm 4 can swing around the pivot member 28. I support it.

The rear end of the torsion bar 9 is a straight extension 20
1 main part 29 of pivot bracket 29 fixed to the lower wall surface
Connected to 1. As shown in FIGS. 3 and 6, the pivot bracket 29 has a mounting portion 292 having an upper end overlapped on the lower wall surface of the straight extension portion 201 and a main portion welded in a direction crossing the lower end of the mounting portion. 291. The mounting portion 292 is long in the vehicle longitudinal direction X and has an inverted U-shaped cross section.
It is bolted to the straight extension 201 at a plurality of locations. The main portion 291 is long in the vehicle width direction Y and has an inverted U-shaped cross section. The vehicle side end is welded to the mounting portion 292 and the vehicle center end is welded to the auxiliary cross member 31.

The torsion bar 9 pivotally supported by the main part 292
The base end of the torsion bar anchor arm 32 is spline-coupled to the portion facing the main part 292. The arm 32 is swingably accommodated in a main portion 292 having an inverted U-shaped cross section. The torsion bar anchor arm 32 has a through hole formed at its pivotal end, and a lower bolt sheet 34 is in contact with the open end of the through hole, and the anchor bolt 33 is locked via the sheet 34. The other end of the anchor bolt 33 is penetrated through a locking hole formed in the main portion 292, and an upper bolt sheet 35 is brought into contact with an opening end of the hole.
The nut 36 is screwed into the threaded portion passing through the nut 5. When the nut 36 is occupied, the torsion angle θ of the torsion bar can be adjusted to increase or decrease, and thereby the set load of the right front suspension Sr including the lower arm 4 can be adjusted to increase or decrease.

As described above, the mounting portion of the right front suspension Sr is disposed in the widened portion 22. Here, since the straight extending portion 201 is provided in the widened portion 22, the straight extending portion 201 is provided. Could be used as a mounting portion for the right front suspension Sr. As a result, symmetric suspensions Sr, Sl
The configuration can be simplified as compared with the case of left-right asymmetry, and there is no need to largely change the configuration of the conventional suspension, and it is easy to reduce the cost. Further, as shown in FIG. 5, the widened portion 22 of the right frame side member 12 has a triangle T formed by the front inclined portion 221, the straight extension portion 201, and the front bent extension portion 231 in a plan view,
Similarly, a triangle T is formed by the rear inclined portion 223, the straight extension portion 211, and the rear bent extension portion 232. These triangle T portions can enhance the torsional rigidity of the widened portion 22 and serve to enhance the rigidity of the high rigidity ladder frame portion G2.

The widened portion 2 of the high rigidity ladder type frame portion G2
The engine support 16 connects between the second member 2 and the intermediate portion 112 of the left frame side member 1. The engine support 16 is formed so as to form a closed cross-sectional structure by overlapping and welding a long plate on a beam member (not shown) having a hat-shaped cross-sectional shape, and is formed as a U-shaped cross member as a whole in front view. ing. Note that reinforcing plates 24 arranged in the vehicle longitudinal direction X are provided inside the left and right ends of the engine support 16.
Are integrally formed, and the upper end of the reinforcing plate is bent and integrally bonded to the mask of the widened portion 22, thereby also enhancing the rigidity of the high-rigidity ladder frame portion G2.

Such a high rigidity ladder type frame portion G2
4 protrudes rightward from the vehicle body center line L0 (see FIG. 1) in a plan view by a large amount b, and furthermore, only the upward facing surface of the pair of left and right side members 1 and 2 is h (FIG. 4).
See below). As a result, the accommodation space M of the power plant 37 as a vehicle body component can be secured in the ladder-shaped frame portion G2 with a width c and a height h. For this reason, the power plant 37 including the vertical type inclined engine is mounted on the engine support 16 via an engine mount (not shown), and is suspended on the rear cross member 15 via an engine mount (not shown).
It is reliably accommodated in the accommodation space M. In particular, the power plant 37 held in the accommodation space M has its output shaft center line (not shown) coincident with the vehicle body center line L0, and the right end of the power plant 37 protrudes largely to the right (FIG. 1), even with such a structure, the power plant 37 can be reliably accommodated, the conventional power transmission system can be used without major design changes, and an increase in cost can be prevented.

As described above, in the anchor support attaching device of FIG. 1, the right frame side member 12 has the widened portion 22 formed near the suspension Sr, and the front and rear members 20 and 21 extend before and after the widened portion. And a reinforcing member 23 for forming a cross section of the widened portion 22 into a closed cross section. The front bent portion 231 and the rear bent portion 232 branched from the widened portion 22 are connected to the front and rear members 20, 21. At one end, a front inclined portion 221 and a rear inclined portion 223 branched from the reinforcing member
Is connected to a portion located on the other end side by a predetermined amount a from one end of the front and rear members 20 and 21, and the straight extension of the partial member existing between the branch portion of the widening portion 22 and the branch portion of the reinforcing member. The attachment portions of the anchor support 29 of the torsion bar 9 were formed on the projections 201 and 211. Here, the straight extending portions 201 and 211 appropriately extend from one ends of the front and rear members 20 and 21, so that the degree of freedom in designing the mounting portion of the anchor support 29 supported by the front and rear members 20 and 21 is increased. It will be. Therefore, it is possible to use the symmetrically designed anchor support 29 and the same torsion bar 9 on the left and right sides, thereby simplifying the configuration, reducing the cost, and changing the design of the existing torsion bar and its anchor support on the suspension side. Can be used without requiring much, and cost reduction can be achieved also in this regard.

Further, the front inclined portion 2 which is a branch portion of the widened portion.
21 and a rear inclined portion 223, a front bent extension portion 231 and a rear bent extension portion 232 which are branch portions of the reinforcing member, and straight extension portions 201 and 211 of partial members located between the two branch portions. As a result, a triangle T is formed,
The mounting portion of the anchor support 29 is installed in the triangle T, so that the rigidity of the mounting portion can be sufficiently enhanced, and the durability of the same portion can be improved. Furthermore, the torsion bar 9
Since the anchor support 29 of the torsion bar is integrally connected to the lower wall surfaces of the straight extension portions 201 and 211, the anchor support of the torsion bar and the front and rear members 20 and 21 can be directly connected, and the support rigidity is increased.

Further, the anchor support 29 has a main portion 291 having an inverted U-shaped cross section, and supports the torsion bar anchor arm 32 integrally coupled with the torsion bar 9 in the main portion so as to be swingable. The anchor arm 32 can be easily displaced to a desired torsion angle and fixed. As described above, the main portion 291 having the inverted U-shape in the pivotal cross section can be effectively used, and the number of parts can be reduced. In the above description, the widened portion 22 is formed on the right frame side member 12. However, the widened portion 22 is formed on the left frame side member 11, and a left front suspension Sl formed symmetrically with the right front suspension Sr is mounted on the same. In this case, the same operation and effect can be obtained.

[0035]

According to the first aspect of the present invention, one of the frame side members is formed with a widened portion near the suspension, and the partial members are formed to extend before and after the widened portion. A reinforcing member formed in a closed cross section has a branch portion of the reinforcing member branched from the widened portion at one end of the partial member, and a branched portion of the widened portion branched from the reinforcing member at a predetermined amount from the one end of the partial member to the other end. Since the attachment part of the anchor support of the torsion bar was formed at the straight extension of the partial member located between the branch part of the widened part and the branch part of the reinforcing member, Since the straight extending portion where the branch portion of the widening portion and the branch portion of the reinforcing member are connected appropriately extends from one end of the partial member, the mounting portion of the anchor support supported by the portion is design So that the degree of freedom of the increases. Therefore, a symmetrical torsion bar and its anchor support can be used, the configuration can be simplified, the cost can be reduced, and the existing torsion bar and its anchor support, etc. can be used without a large change in the design of the suspension side. It is also possible to reduce costs in this regard.

According to a second aspect of the present invention, in the anchor support attaching apparatus according to the first aspect, the branch portion of the widened portion, the branch portion of the reinforcing member, and the linear extension of the partial member located between the two branch portions. Since the triangle is formed by the parts, the mounting part of the anchor support is installed in the triangle, the rigidity of the mounting part can be sufficiently enhanced, and the durability of the part can be improved.

According to the third aspect of the present invention, in the anchor support attaching device according to the first aspect, the anchor support of the torsion bar is integrally connected to the lower wall surface of the straight extension of the partial member. The support and the partial member can be directly connected, and the support rigidity is increased.

According to a fourth aspect of the present invention, in the anchor support attaching device according to the third aspect, the anchor support has a main portion having an inverted U-shaped cross section, and a torsion bar integrally connected to the torsion bar in the main portion. Since the anchor arm is swingably supported, the torsion bar anchor arm can be easily displaced to a desired torsion angle and fixed. In this way, the main part having the inverted U-shape in the pivotal cross section can be effectively used, and the number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a ladder-type frame equipped with an anchor support attaching device according to an embodiment of the present invention.

FIG. 2 is a side view of the ladder frame of FIG. 1;

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 1;

FIG. 5 is an enlarged partial plan view of a widened portion of the ladder frame of FIG. 1;

FIG. 6 is a cutaway enlarged perspective view of a widened portion of the ladder type frame of FIG. 1;

FIG. 7 is an enlarged partial plan view of a main part of a front right suspension used in the anchor support attaching device of FIG. 1;

FIG. 8 is a cutaway rear view of a main part of a right front suspension of a vehicle equipped with the conventional device. DESCRIPTION OF SYMBOLS 11 Left frame side member 111 Front part 112 Intermediate part 113 Rear part 12 Right frame side member 13 Front cross member 14 Front and rear cross member 15 Front and rear cross member 16 Engine support 20 Front member 201 Straight extension part 21 Rear member 211 Straight extension Protruding part 22 Wide part 221 Front inclined part 223 Rear inclined part 23 Reinforcement member 231 Front bent extension part 232 Rear bent extension part 37 Powerplant G1 Front ladder frame part G2 High rigid ladder frame part G3 Rear ladder type Frame M Housing space X Vehicle longitudinal direction Y Vehicle width direction L0 Body center line T Triangle

──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshitaka Hayashi 5-33-8 Shiba, Minato-ku, Tokyo, Mitsubishi Motors Corporation (72) Haruo Suzuki 4-2-1-1, Shimomaruko, Ota-ku, Tokyo No./Mitsubishi Automotive Engineering Co., Ltd. (56) References JP-A-6-2788643 (JP, A) JP-A 61-42326 (JP, U) JP-A 53-161419 (JP, U) JP-A 3-40168 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 21/00-21/02

Claims (4)

(57) [Claims] 1. An anchor support mounting apparatus comprising a pair of frame side members joined to both ends of a cross member and extending in the longitudinal direction of a vehicle with a predetermined width and having a suspension provided with a torsion bar. A reinforcing member for forming a widened portion near the suspension and extending a partial member before and after the widened portion, forming a cross section of the widened portion into a closed cross section, and branching from the widened portion. The branching portion of the reinforcing member is connected to one end of the partial member, and the branching portion of the widening portion branched from the reinforcing member is connected to a portion located at a predetermined amount from the one end of the partial member to the other end. The torsion bar has a straight extending portion of the partial member located between the branch portion of the portion and the branch portion of the reinforcing member. An anchor support mounting device, wherein an anchor support mounting portion is formed. 2. The anchor support mounting device according to claim 1, wherein said branch portion of said widened portion, said branch portion of said reinforcing member, and said member extending straight between said branch portions. An anchor support attachment device, characterized in that a triangle is formed by the part and the triangle. 3. The anchor support mounting device according to claim 1, wherein the pivot bracket of the torsion bar is integrally connected to a lower wall surface of the straight extension of the partial member. . 4. The anchor support mounting device according to claim 3, wherein the pivot bracket has a main portion having an inverted U-shaped cross section, and a torsion bar anchor arm integrally connected to the torsion bar in the main portion. An anchor support mounting device characterized in that it is swingably supported.