JP5502600B2 - Vehicle front structure - Google Patents

Description

  The present invention relates to a vehicle front structure in which a bumper beam in front of a vehicle is attached to a vehicle body.

Some vehicle front structures are provided with a front bumper that absorbs an impact when the front of the vehicle comes into contact.
In this structure, for example, the bumper beam of the front bumper is attached to the left and right side frames of the front body, and the reinforcement beam is stacked on the upper part of the bumper beam, thereby reinforcing the structure without impairing shock absorption (see, for example, Patent Document 1). ).

  In addition, some bumper beams have their longitudinal centers opened up and down to raise and lower the height from the ground, so that they can handle both high and low collision opponents ( For example, see Patent Document 2).

  Still another bumper beam includes one in which the center in the longitudinal direction is separated by forming a bend in a square tube with hydroform and overlapping the square tubes (see, for example, Patent Document 3).

However, Patent Documents 1 and 2 of the prior art are extruded materials made of an aluminum alloy, and if an aluminum alloy is used, it becomes more expensive than steel.
On the other hand, since Patent Document 3 is formed by hydroforming, the strength is small compared to the strength of a material that can be plastically processed on the mold surface of the mold, and the strength of the bumper beam cannot be increased.
Therefore, it has been desired to use steel and cope with different vehicle heights such as a bumper beam, and to increase the impact strength without impairing weight reduction.

JP 2004-262300 A JP 2009-214714 A JP 2008-221920A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle front structure with improved impact strength, which prevents an underride that sinks into the underside of a previous vehicle when the front wheel side is lowered and contacts during sudden braking. .

In order to solve the above-mentioned problem, the invention according to claim 1 is directed to a vehicle front structure in which both ends of a tubular bumper beam are connected to left and right side frames extending toward the front of the vehicle, and the bumper beam is a lower bumper beam. The upper and lower bumper beams are overlapped with each other, and both ends of the lower and upper bumper beams are formed in a straight line shape toward the front of the vehicle and the center of the vehicle in the plan view of the vehicle. The central part that is continuous with the straight line is formed in front of the vehicle from both ends, and one central part of the central part is bent upward or downward so as to be separated from the other central part. An upper bend with a rounded corner formed by the middle and middle of the upper bumper beam and a lower bend with a rounded corner formed by the middle and central of the lower bumper beam Characterized in that the plan view of the vehicle, the radius of the center are different in the vehicle width direction.

The invention according to claim 2 is a vehicle front structure in which both ends of a tubular bumper beam are connected to left and right side frames extending toward the front of the vehicle. The bumper beam overlaps the lower bumper beam with the upper bumper beam, Thus, both ends of the lower and upper bumper beams are formed in a straight line shape toward the front of the vehicle and toward the vehicle center, an intermediate portion continuous with the both end portions is formed toward the front of the vehicle, and a central portion continuous with the intermediate portion is formed in a straight line shape. In addition, it is formed in front of the vehicle from both ends, and one central part of the central part is bent upward or downward of the vehicle so as to be separated from the other central part, and the middle part and the central part of the upper bumper beam The radius is different between the upper bent part with the rounded corner formed by and the lower bent part with the rounded corner formed by the middle part and the center part of the lower bumper beam. And butterflies.

The invention according to claim 3 is that at least one of the lower bumper beam and the upper bumper beam is formed by heating a high-tensile steel pipe, continuously bending a middle portion, and continuously cooling. Features.

The invention according to claim 4 is characterized in that the middle part of the lower / upper bumper beam is formed by connecting the respective front side parts facing forward of the vehicle with a front connecting member.

The invention according to claim 5 is characterized in that both end portions of the lower and upper bumper beams are joined by rear connecting members of the respective rear side portions facing toward the rear of the vehicle.

In the invention according to claim 1, the bumper beams connected to the left and right side frames are formed so that the upper bumper beam is superimposed on the lower bumper beam, and both end portions of the lower and upper bumper beams are formed in a straight line shape toward the vehicle front and the vehicle center. The middle part that is continuous to the vehicle is formed toward the front of the vehicle, the central part that is continuous to the middle part is formed in a straight line and forward of the vehicle from both ends, and one of the central parts is It is bent upward or downward in the vehicle so as to be separated from the central part, and an upper bent part formed by an intermediate part and a central part of the upper bumper beam is rounded, and an intermediate part and a central part of the lower bumper beam The lower bent portion with the rounded corner formed has a different radius in the vehicle width direction in the vehicle plan view. First, when the vehicle contacts (collises) the rear portion of the previous vehicle, the previous vehicle of Part is Meanwhile interfere with the central portion of the (upper bumper beam in this case). As a result, it is possible to prevent the underride from entering under the previous vehicle.

  Underride means that if the front part of the vehicle is lowered (sinks) by sudden braking just before the rear-end collision, it will enter under the rear part of the previous vehicle when it comes into contact, and the previous vehicle will ride up.

Moreover, weight reduction and the strength improvement with respect to the contact (collision) of the vehicle front can be made compatible.
The bumper beam has a convex shape that is pushed out toward the front of the vehicle by the intermediate portion in a plan view of the vehicle. When an impact is input from the front of the vehicle, the intermediate portion is distributed to the compression load and transmitted to the side frame. Therefore, the collision strength against the impact (load) input to the front of the vehicle can be increased, and as a result, the thickness and weight can be reduced.

In particular, in the present invention, as described above, the upper bent portion formed between the middle portion and the central portion of the upper bumper beam is an upper bent portion, and the angle formed between the intermediate portion and the middle portion of the lower bumper beam is the lower Since the center of the radius of the bending part is different in the vehicle width direction in the vehicle plan view, the strength of the upper bumper beam and the strength of the lower bumper beam with respect to the impact (load) input to the front of the vehicle are different, and the upper and lower sides are inclined upward or downward The moment at the time of an offset collision can be reduced to prevent underride.

In the invention according to claim 2 , the bumper beams that are continuous with the left and right side frames are formed so that the upper bumper beam is superimposed on the lower bumper beam, and both end portions of the lower and upper bumper beams are formed in a straight line shape toward the vehicle front and the vehicle center. The middle part that is continuous to the vehicle is formed toward the front of the vehicle, the central part that is continuous to the middle part is formed in a straight line and forward of the vehicle from both ends, and one of the central parts is It is bent upward or downward in the vehicle so as to be separated from the central part, and an upper bent part formed by an intermediate part and a central part of the upper bumper beam is rounded, and an intermediate part and a central part of the lower bumper beam Since the radius of the lower bent portion with the rounded corner formed is different, first, when the vehicle contacts (collises) with the rear portion of the front vehicle, the rear portion of the front vehicle is one (here, the upper bumper). Interfere with the central portion of the over-time). As a result, it is possible to prevent the underride from entering under the previous vehicle.
In particular, in the present invention, the upper bent portion formed by the corner formed by the middle portion and the central portion of the upper bumper beam is the upper bent portion, and the lower bent portion formed by the corner formed by the intermediate portion and the middle portion of the lower bumper beam are Because the radius is different, the strength of the upper bumper beam and the strength of the lower bumper beam with respect to the impact (load) input to the front of the vehicle is different, and the moment at the time of the vertical offset collision that is offset upward or downward is reduced, and the underride Can be prevented.
Underride means that if the front part of the vehicle is lowered (sinks) by sudden braking just before the rear-end collision, it will enter under the rear part of the previous vehicle when it comes into contact, and the previous vehicle will ride up.
Moreover, weight reduction and the strength improvement with respect to the contact (collision) of the vehicle front can be made compatible.
The bumper beam has a convex shape that is pushed out toward the front of the vehicle by the intermediate portion in a plan view of the vehicle. When an impact is input from the front of the vehicle, the intermediate portion is distributed to the compression load and transmitted to the side frame. Therefore, the collision strength against the impact (load) input to the front of the vehicle can be increased, and as a result, the thickness and weight can be reduced.

In the invention according to claim 3 , at least one of the lower bumper beam and the upper bumper beam is formed by heating a high-tensile steel pipe, continuously bending an intermediate portion, and continuously cooling. The production cost can be reduced, the weight can be reduced, and a desired strength can be imparted.

In the invention according to claim 4 , since the middle part of the lower and upper bumper beams connects the front side parts facing the front of the vehicle with the front connecting member, when an impact (load) is input to the front of the vehicle The front side parts to which the load is transmitted are connected to each other, and the moment when the vertical offset collision occurs can be further reduced.

In the invention according to claim 5 , the both end portions of the lower and upper bumper beams are connected to the rear side portions facing the rear of the vehicle by the rear connecting members. When the impact strength (load) is input to the front of the vehicle, the bumper beam extension can be crushed (compressed) in the axial direction by the load.

It is a front view which shows the outline | summary of the vehicle front part structure concerning the Example of this invention. It is a top view of the vehicle front part structure concerning an example. It is drawing of the bumper beam of a vehicle front part structure, (a) is a top view, (b) is a b arrow line view of (a). FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. FIG. 5 is a sectional view taken along line 5-5 of FIG. FIG. 4 is a plan view of a lower bumper beam, (a) is a plan view of the upper bumper beam, and (b) is a plan view of the lower bumper beam.

  Hereinafter, embodiments of the present invention will be described in detail with reference to examples.

  As shown in FIGS. 1 and 2, the vehicle front structure according to the embodiment is adopted in the front portion 12 of the vehicle 11, and the bumper beam 14 of the front front bumper mechanism 13 is attached to the left and right side frames 16 and 17 of the vehicle body 15. It is installed.

  As shown in FIGS. 1 to 5, the bumper beam 14 has an upper bumper beam 22 mounted on a lower bumper beam 21, separated from the center, and both ends overlapped. Both end portions are a left end portion 23 of the lower bumper beam 21, a right end portion 24 of the lower bumper beam 21, a left end portion 25 of the upper bumper beam 22, and a right end portion 26 of the upper bumper beam 22.

  The vehicle body 15 includes a front body 31 included in the front portion 12, and the front body 31 includes the left side frame 16 and the right side frame 17 described above.

  The left side frame 16 (FIGS. 2 and 5) is hollow (closed cross-sectional shape), and has a first side wall 33 that faces the inner side of the vehicle 11 (in the direction of arrow a1), and second and second sides that are continuous with the first side wall 33. 3 side walls 34, 35, and a fourth side wall 36 that continues to the second and third side walls 34, 35 and faces the first side wall 33. The fourth side wall 36 faces the outside of the vehicle 11 (the direction of the arrow a2).

  A first flange 41 is attached to the front end 38 of the side frame 16, and a left bumper beam extension 42 is fastened to the first flange 41 with a first bolt 43.

The right side frame 17 is substantially symmetric with the left side frame 16 with respect to the center (center line C) of the vehicle body 15 in the vehicle width direction.
A bumper beam 14 having a vehicle front structure is attached to the bumper beam extension 42.
The vehicle front structure is substantially symmetrical with respect to the center (center line C) of the vehicle body 15 in the vehicle width direction.

Next, the main structure of the vehicle front structure will be described with reference to FIGS.
In the vehicle front structure, both end portions 47 and 48 of the tubular bumper beam 14 are connected to left and right side frames 16 and 17 extending toward the front surface 46 of the vehicle 11.

  The bumper beam 14 overlaps the lower bumper beam 21 with the upper bumper beam 22, and both ends 23 and 24 of the lower bumper beam 21 and both ends 25 of the upper bumper beam 22 in a plan view of the vehicle 11 (viewpoints in FIGS. 3A and 6). 26 is formed in a straight line shape toward the front of the vehicle and toward the center of the vehicle, that is, obliquely (in the direction of the arrow a3), and intermediate portions 53 and 54 that are continuous to both end portions 23 and 24 and intermediate portions that are continuous to both end portions 25 and 26. Portions 55 and 56 are formed toward the front of vehicle 11 and toward the center of the vehicle (in the direction of arrow a4).

A central portion 57 that is continuous to the intermediate portions 53 and 54 is formed linearly and in front of the vehicle 11 from both end portions 23 and 24, and a central portion 58 that is continuous to the intermediate portions 55 and 56 is linear and both end portions 25. 26, the vehicle 11 is formed in front of the vehicle 11, and one of the central portions 57 and 58 (for example, 22) is located above or below the vehicle 11 so that the central portion is separated from the other (for example, 21) central portion. It is bent to
Here, as shown in FIG. 3B, the central portion 58 of the upper bumper beam 22 is bent upward from the vehicle 11 so as to be separated from each other.

  In the bumper beam 14, as shown in FIG. 3A and FIG. 6, the upper bent portion 61 formed by the corners formed by the intermediate portions 55 and 56 of the upper bumper beam 22 and the central portion 58 is an intermediate portion of the lower bumper beam 21. The lower bent portion 62 having a rounded corner formed by the portions 53 and 54 and the central portion 57 has a distance L1 in the vehicle width direction (X-axis direction) when the center ou and ow of the radii ru and rw are in plan view. Only different.

The center ow of the radius rw of the lower bumper beam 21 is a distance L2 from the longitudinal center C of the lower bumper beam 21.
On the other hand, the center ou of the radius ru of the upper bumper beam 22 is a distance L3 from the longitudinal center C of the upper bumper beam 22. The distance L3 is longer than L2.
That is, the upper bumper beam 22 is bent large (so that the angle α is small).

Further, an angle formed by the upper bent portion 61 having a rounded corner formed by the intermediate portions 55 and 56 and the central portion 58 of the upper bumper beam 22 and an angle formed by the intermediate portions 53 and 54 and the central portion 57 of the lower bumper beam 21. The lower bent portion 62 having a rounded radius has different radii ru and rw.
The radius ru of the upper bumper beam 22 is smaller than the radius rw of the lower bumper beam 21.

  The intermediate portions 57 and 58 of the lower and upper bumper beams 21 and 22 connect the front side portions 63 and 64 facing the front of the vehicle 11 by a front connecting member 65.

Both end portions 23, 24, 25, and 26 of the lower and upper bumper beams 21 and 22 are connected to the rear side portions 66 and 67 facing the rear of the vehicle 11 by a rear connecting member 71 (FIG. 5).
Further, as shown in FIG. 5, the end portions 23 and 25 are formed by connecting the corner portion 74 of the upper bumper beam 22 to the corner portion 73 of the lower bumper beam 21 by a welding portion 75. The same applies to both end portions 24 and 26.

Next, the bumper beam 14 will be described in detail.
The left side of the bumper beam 14 will be described, and the right side will be described as necessary.

In the bumper beam 14, one end (left end) 47 of FIG. 3 is composed of an end (lower left end) 23 of the lower bumper beam 21 and an end (upper left end) 25 of the upper bumper beam 22.
The other end (right end) 48 includes a lower right end 24 and an upper right end 26.

One intermediate portion 51 includes an intermediate portion (lower left intermediate portion) 53 of the lower bumper beam 21 and an intermediate portion (upper left intermediate portion) 55 of the upper bumper beam 22.
The other intermediate portion 51 includes an intermediate portion (lower right intermediate portion) 54 and an intermediate portion (upper right intermediate portion) 56.

  Further, the central portion 77 of the bumper beam 14 includes a central portion (lower central portion) 57 of the lower bumper beam 21 and a central portion (upper central portion) 58 of the upper bumper beam 22.

The bumper beam 14 has a maximum front-rear length Lm from the center portion 77 to the left end portion 47 and the right end portion 48 in a plan view of the vehicle 11 (view point in FIG. 3A).
The maximum longitudinal length Lm coincides with the maximum longitudinal length L1 (FIG. 6) of the lower bumper beam 21 and the maximum longitudinal length L2 of the upper bumper beam 22.

The lower bumper beam 21 is formed in a straight line when the vehicle 11 is viewed from the front (viewpoint in FIG. 3B).
As shown in FIGS. 4 and 5, the lower bumper beam 21 has a square cross-sectional shape.
The front side portion 63, the rear side portion 66, the top portion 81, and the bottom portion 82 are included.
The rear side portion 66 is provided with a hole 85 for fastening to the bumper beam extension 42 with the second bolt 84 at the left end portion 23.
A tool hole 86 is formed in the front side portion 63 concentrically with the hole 85.

  The lower bumper beam 21 is obtained by plastically processing the aforementioned lower bent portion 62 and the second lower bent portion 91 (FIG. 6B) into a straight pipe material using a bending apparatus (not shown).

The upper bumper beam 22 has a square cross-sectional shape. It consists of a front side portion 64, a rear side portion 67, a top portion 93, and a bottom portion 94.
The rear side portion 67 has a hole 95 for fastening the bumper beam extension 42 to the bumper beam extension 42 with the second bolt 84 at the left end portion 25.
A tool hole 96 is formed in the front side portion 64 concentrically with the hole 95.

  The upper bumper beam 22 is obtained by plastically processing the above-described upper bending portion 61 and the second upper bending portion 98 (FIG. 6A) into a straight pipe material using a bending apparatus (not shown).

  The lower bumper beam 21 heats the high-tensile steel pipe and continuously bends the second lower bent portion 91, the intermediate portion 53, the lower bent portion 62, the lower bent portion 62, the intermediate portion 54, and the second lower bent portion 91. It is formed by molding and continuously cooling.

  The upper bumper beam 22 heats the high-tensile steel pipe and continuously bends the second upper bent portion 98, the intermediate portion 55, the upper bent portion 61, the upper bent portion 61, the intermediate portion 56, and the second upper bent portion 98. It is formed by molding and continuously cooling.

The bending apparatus is an existing apparatus.
This device performs bending and heat treatment continuously. After passing one end of the straight pipe material through the support roll, it passes through the adjacent heating furnace and moves (biaxial, horizontal, vertical). Bending to a predetermined radius and quenching by cooling. As a specific forming procedure, for example, the technique described in “Patent No. 4198715” can be cited.

Next, the operation of the vehicle front structure will be described.
A mechanism for preventing underriding of the vehicle front structure, a mechanism for increasing the collision strength, and other mechanisms will be described.

  In the vehicle front structure, as shown in FIGS. 2 and 4, when the vehicle 202 is in contact with the front vehicle 201, it is possible to prevent an underride in which the rear portion 202 of the front vehicle 201 rides up as indicated by an arrow a <b> 6. .

  Specifically, the bumper beam 14 is bent upward so that the central portion 58 of the upper bumper beam 22 is separated from the central portion 57 of the lower bumper beam 21, so that the height of the bumper beam 14 is not separated. The bumper beam 14 can be provided at a desired height from the ground, with a height h (FIG. 3B) higher than the height. Therefore, underride can be prevented.

  On the other hand, as shown in FIG. 1 and FIG. 3B, the empty space 101 can be secured along the both end portions 47, 48 by not separating the both end portions 47, 48. As a result, there is an advantage that the degree of freedom in designing parts such as the headlamp 102 is increased. For example, the lower portion of the headlamp 102 can be disposed in the empty space 101 at a position lower than the central portion 77 of the bumper beam 14.

  In the vehicle front structure, both end portions 47 and 48 of the bumper beam 14 attached to the vehicle body 15 are formed in a straight line shape toward the front and the center of the vehicle 11, and an intermediate portion 51 continuous with the both end portions 47 and 48 faces the front of the vehicle 11. Since the central portion 77 formed and continuous to the intermediate portion 51 is formed in a straight line and in front of the vehicle 11 from both end portions 47 and 48, when an impact (load) is input to the front surface 46 of the vehicle 11, The load is dispersed and transmitted as a compressive load to the intermediate portion 51 and both end portions 47 and 48 by the intermediate portion 51 and both end portions 47 and 48 in the directions of arrows a4 and a3. Therefore, the collision strength against the frontal collision can be increased.

  In the vehicle front structure, the intermediate portion 51 of the bumper beam 14 has a different shape between the lower bumper beam 21 and the upper bumper beam 22, and therefore, when an impact (load) is input to the front surface 46 of the vehicle 11, the upper bumper beam 22 and the lower bumper beam 22. The magnitude of the load dispersed at 21 can be varied.

  Specifically, first, the maximum longitudinal lengths L1 and L2 are matched, the center ou position of the radius ru of the upper bumper beam 22 is brought closer to the end than the center ow position of the radius rw of the lower bumper beam 21, and the radius of the lower bumper beam 21 is reached. The radius ru of the upper bumper beam 22 is reduced. That is, by bending the upper bumper beam 22 large (so that the angle α becomes small), the upper bumper beam 22 has a bending strength with respect to the input direction (the direction of arrow a7 in FIG. 4) of the impact (load) input to the front surface of the vehicle 11. Increases and the moment in the twisting direction (the direction of the arrow a8 in FIG. 4) can be suppressed during underride.

  Second, when an impact (load) is input to the front surface of the vehicle 11, the force is increased at the upper bending portion 61 of the upper bumper beam 22 with the radius ru and the lower bending portion 62 of the lower bumper beam 21 with the radius rw (stress concentration). Therefore, the site where the force is large can be dispersed. Therefore, the plate thickness of the upper bumper beam 22 and the lower bumper beam 21 can be reduced, and the thickness and weight can be reduced.

  The rear connecting member 71 is fastened at the center to the lower bumper beam 21 and the upper bumper beam 22 by the second bolt 84, and the edge 104 is fixed to the bottom portion 82 and the top portion 93 by the welded portion 105. The strength against twisting (in the direction of arrow a8 in FIG. 4) of the central portion 77 of the bumper beam 14 can be increased as compared with the case fixed to 1.

Although the bumper beam 14 of the present invention is employed in the front portion 12 of the vehicle 11 in the embodiment, it may also be employed as a rear bumper beam in the rear portion of the vehicle.
In the rear bumper beam, the central portion of the lower bumper beam is bent downward from the vehicle so as to be separated from the central portion of the upper bumper beam. As a result, the rear ride can be prevented from falling (sinking) due to sudden braking and entering under the rear of the vehicle.

  The vehicle front portion structure of the present invention is suitable for a vehicle.

  DESCRIPTION OF SYMBOLS 11 ... Vehicle, 14 ... Bumper beam, 16 ... Left side frame, 17 ... Right side frame, 21 ... Lower bumper beam, 22 ... Upper bumper beam, 23 ... End part (left end part) of lower bumper beam, 24 ... End of lower bumper beam Part (right end part), 25 ... end part (left end part) of the upper bumper beam, 26 ... end part (right end part) of the upper bumper beam, 46 ... front of the vehicle, 47 ... end part (left end part) of the bumper beam, 48 ... bumper beam Of the lower bumper beam, 55, 56 ... an intermediate portion of the upper bumper beam, 57 ... a central portion of the lower bumper beam, 58 ... a central portion of the upper bumper beam, 61 ... an upper bent portion, 62 ... lower bent part, 65 ... front connecting member, 71 ... rear connecting member, ru ... radius of upper bent part, rw ... radius of lower bent part.

Claims (5)

In the vehicle front structure in which both ends of the tubular bumper beam are connected to the left and right side frames extending toward the front of the vehicle,
The bumper beam overlaps the lower bumper beam with the upper bumper beam overlapped, and the both ends of the lower and upper bumper beams are formed in a straight shape toward the vehicle front and the center of the vehicle in a plan view of the vehicle. Is formed toward the front of the vehicle, a central portion continuing to the intermediate portion is linearly formed at the front of the vehicle from the both ends, and one central portion of the central portions is the other The vehicle is bent upward or downward so as to be separated from the central portion of the vehicle,
An upper bent portion having a rounded corner formed by the intermediate portion and the central portion of the upper bumper beam, and a lower bent portion having a rounded corner formed by the intermediate portion and the central portion of the lower bumper beam. Is a vehicle front structure characterized in that the center of the radius differs in the vehicle width direction in plan view of the vehicle. In the vehicle front structure in which both ends of the tubular bumper beam are connected to the left and right side frames extending toward the front of the vehicle,
The bumper beam overlaps the lower bumper beam with the upper bumper beam overlapped, and the both ends of the lower and upper bumper beams are formed in a straight shape toward the vehicle front and the center of the vehicle in a plan view of the vehicle. Is formed toward the front of the vehicle, a central portion continuing to the intermediate portion is linearly formed at the front of the vehicle from the both ends, and one central portion of the central portions is the other The vehicle is bent upward or downward so as to be separated from the central portion of the vehicle,
An upper bent portion having a rounded corner formed by the intermediate portion and the central portion of the upper bumper beam, and a lower bent portion having a rounded corner formed by the intermediate portion and the central portion of the lower bumper beam. Have different radii
A vehicle front structure characterized by that. At least one of the upper bumper beam and the lower bumper beam is, the claims heated high-tensile steel pipe formed by bending the middle portion in succession, and characterized in that formed by cooling successively The vehicle front structure according to 1 or 2 . The vehicle front part structure according to claim 1 or 2 , wherein the intermediate parts of the lower and upper bumper beams are joined by front connecting members at respective front side parts facing forward of the vehicle. The vehicle front structure according to claim 1 , wherein the both end portions of the lower and upper bumper beams are joined by rear connecting members at the rear side portions facing toward the rear of the vehicle.

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