JP6529795B2 - Joint bus - Google Patents

Description

  The present invention relates to an articulated bus in which a front vehicle and a rear vehicle are pivotably connected in the vehicle longitudinal direction.

  In Japan, at the Tsukuba Expo in 1985, a joint bus connecting the front and rear vehicles was introduced. The articulated bus is a bus provided with openings at the rear of the front vehicle and at the front of the rear vehicle to allow passengers to travel between the front and rear vehicles. The articulated bus is a puller-type articulated bus in which a front vehicle tows a rear vehicle. Since the engine is mounted under the central floor of the front vehicle, the tow-type articulated bus becomes a two-step bus having two steps of steps at the entrance and exit because the floor surface is raised.

Japanese Patent Application Laid-Open No. 07-205844 Japanese Patent Application Publication No. 2002-037121

  In recent years, non-step low-floor baths, in which steps are reduced by lowering the floor, have become mainstream in order to improve getting on and off. In a low floor bus, the engine is mounted at the rear end of the vehicle to realize low floor and non-stepping. In view of the current of such times, it is considered that low beds and non-stepping are strongly required even for articulated buses. Therefore, it is conceivable to lower the floor and reduce steps of the entire front vehicle by mounting an engine at the rear end of the rear vehicle and using a pusher-type articulated bus that pushes the front vehicle with the rear vehicle.

  However, in the pusher-type articulated bus in which the engine is mounted on the rear vehicle, the compression and tensile loads due to acceleration and deceleration of the engine propulsion force are transmitted from the articulation to the front vehicle. For this reason, there is a problem that deformation due to buckling deformation, bending, bending, welding peeling or the like is easily generated in the vicinity of the joint node of the front vehicle.

  Also, the bus does not ensure the strength and rigidity of the entire bus with the chassis frame alone, but also the strength and rigidity of the entire bus with the body. The body of the bus has a skeleton structure (framework structure), and is a pentahedron of a pair of side structure parts, a front structure part, a rear structure part, and a roof structure part (see, for example, Patent Document 1). However, at the articulation, the continuity of the body is broken between the front and rear vehicles. As a result, the compressive and tensile loads are concentrated in the vicinity of the articulation of the front vehicle, so there is also a problem that deformation tends to occur in the vicinity of the articulation of the front vehicle.

  Further, in the case of the two-step bus, since the floor height is high, it is possible to linearly extend the pair of left and right rail parts constituting the chassis frame. However, in the case of a low floor bath, since the floor height is low, it is necessary to bend the rear end portion of the rail portion to wrap around the upper portion of the rear wheel (see, for example, Patent Document 2). The bent portion of the rail portion is likely to be elastically deformed in the opening and closing direction, and may be plastically deformed. Therefore, in the pusher-type articulated bus where the front vehicle is a low floor bus, deformation in the vicinity of the articulated portion of the front vehicle is greater than that of the pusher-type articulated bus where the front vehicle is a two-step bus. There is also the problem of being easy.

  Then, an object of this invention is to provide the articulated bus which can suppress a deformation | transformation of a front vehicle.

  The articulated bus according to the present invention is capable of swinging the front vehicle to which the front and rear wheels are attached, the rear vehicle disposed behind the front vehicle in the vehicle longitudinal direction, the front vehicle and the rear vehicle The chassis frame of the front vehicle includes a pair of rail portions arranged in parallel in the vehicle width direction and extending in the vehicle longitudinal direction, and a rear end portion of the front vehicle in the vehicle longitudinal direction It extends in the width direction and extends in the vehicle width direction ahead of the first transversely extending portion in the vehicle longitudinal direction ahead of the first transversely extending portion connected to the articulated node, and is connected to the vehicle longitudinal direction rear end portions of the pair of rail portions A second transversely extending portion, and a pair of bending rail portions which are juxtaposed in the vehicle width direction and which are connected to the first transversely extending portion and the second transversely extending portion by going up in the vehicle vertical direction of the rear wheel. And a first reinforcing portion connected to the first lateral extending portion, the second lateral extending portion, and the bending rail portion.

  In the articulated bus according to the present embodiment, since the first reinforcing portion is connected to the first laterally extending portion, the second laterally extending portion, and the bending rail portion, elastic deformation in the opening and closing direction of the bending rail portion is suppressed. . Thereby, the strength and rigidity in the vicinity of the articulation of the front vehicle are improved. Moreover, in the pusher-type articulated bus, even when a load is transmitted from the articulated portion to the front vehicle, this load can be properly transmitted to the rail portion. Thereby, the deformation of the front vehicle can be suppressed.

  The first reinforcing portion is connected to the reinforcing bottom plate portion connected to the upper surface in the vehicle vertical direction of the first lateral extending portion and the second lateral extending portion, and the reinforcing bottom plate portion and the inner side surface in the vehicle width direction of each bending rail portion And a pair of reinforcing side plate portions. In this articulated bus, the reinforcement bottom plate is connected to the upper surfaces of the first and second laterally extending parts, and the reinforcing side plate is connected to the inner side of each bent rail, so The load in the longitudinal direction of the vehicle transmitted to the front vehicle can be received in the shear direction. This further improves the strength and rigidity of the front vehicle.

  The reinforcement bottom plate portion may extend in the vehicle width direction along the first laterally extending portion to a position outside the bending rail portion in the vehicle width direction behind the bending rail portion in the vehicle longitudinal direction. In this articulated bus, at least a part of the rear reinforcement bottom plate portion is disposed rearward of the bending rail portion in the vehicle longitudinal direction, so the load transmitted from the articulated portion to the first transversely extending portion is efficiently bent. It can be transmitted to the rail section.

  The chassis frame further includes a third transverse extending portion extending in the vehicle width direction between the first transverse extending portion and the second transverse extending portion in the longitudinal direction of the vehicle and connected to the bending rail portion, and the reinforcing bottom plate portion It is divided into the front reinforcement bottom plate connected to the upper surface of the second horizontal extension and the third horizontal extension in the vehicle vertical direction, and the front reinforcement bottom plate, and the vehicle vertical direction of the third horizontal extension and the first horizontal extension And the front reinforcement bottom plate extends in the longitudinal direction of the vehicle through the space between the pair of bending rails, and the rear reinforcement bottom plate is formed of the bending rail It may extend in the vehicle width direction along the first transversely extending portion to a position outside the bending rail portion in the vehicle width direction at the rear in the vehicle longitudinal direction. In this articulated bus, at least a part of the rear reinforcement bottom plate portion is disposed rearward of the bending rail portion in the vehicle longitudinal direction, so the load transmitted from the articulated portion to the first transversely extending portion is efficiently bent. It can be transmitted to the rail section. In addition, since the front reinforcing bottom plate portion and the rear reinforcing bottom plate portion having different shapes are separate members, the manufacturing of the reinforcing bottom plate portion becomes easy.

  The first reinforcing portion may be connected to the first transverse extending portion, the second transverse extending portion and the bending rail portion by plug welding. In this articulated bus, since the first reinforcing portion is connected to the first transverse extending portion, the second transverse extending portion and the bending rail portion by plug welding, the first transverse extending portion, the second transverse extending portion and the bending rail The first reinforcing portion can be firmly connected to the portion.

  The chassis frame may further include a second reinforcing portion connected to the lower surface of the first laterally extending portion and the bending rail portion in the vehicle vertical direction. In this articulated bus, the first transversely extending portion and the bending rail portion are sandwiched by the rear reinforcement bottom plate portion and the second reinforcing portion, so that the strength and the rigidity of the first transversely extending portion and the bending rail portion are further improved. . In addition, since the second reinforcing portion is connected to the lower surfaces of the first laterally extending portion and the bending rail portion, the second reinforcing portion can receive a load in the longitudinal direction of the vehicle transmitted from the joint portion to the front vehicle in the shear direction. This further improves the strength and rigidity of the front vehicle.

  The second reinforcing portion may extend in the vehicle width direction along the first laterally extending portion to a position outside the bending rail portion in the vehicle width direction behind the bending rail portion in the vehicle longitudinal direction. In this articulated bus, at least a part of the second reinforcement portion is disposed rearward of the bending rail portion in the vehicle longitudinal direction, so the load transmitted from the articulation portion to the first transversely extending portion can be efficiently bent. Can be told to the department.

  The second reinforcing portion may be connected to the first transversely extending portion and the bending rail portion by plug welding. In this articulated bus, since the second reinforcing portion is connected to the first transversely extending portion and the bending rail portion by plug welding, the second reinforcing portion is firmly connected to the first transversely extending portion and the bending rail portion it can.

  According to the present invention, the deformation of the front vehicle can be suppressed.

It is a schematic side view of a joint bus. It is the perspective view which looked at the body of the front vehicles from the back. It is a schematic plan view of a connection part. It is a schematic perspective view of a front chassis frame. It is a schematic plan view of a front chassis frame. It is a schematic side view of a front chassis frame. It is a schematic perspective view of the front chassis frame which removed the reinforcement part. It is a schematic plan view of the front chassis frame which removed the reinforcement part. It is a schematic side view of the front chassis frame which removed the reinforcement part. It is a schematic perspective view of a 1st reinforcement part. It is a general | schematic disassembled perspective view of a 1st reinforcement part. It is a schematic sectional drawing in the XII-XII line shown in FIG. It is a schematic sectional drawing in the XIII-XIII line shown in FIG. It is a schematic perspective view of a 2nd reinforcement part.

  Hereinafter, the joint bus according to the embodiment will be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals and redundant description will be omitted. Further, in the following description, the front and rear in the vehicle longitudinal direction may be simply referred to as front and rear, and the upper and lower in the vehicle vertical direction may also be referred to as upper and lower.

  FIG. 1 is a schematic side view of an articulated bus. As shown in FIG. 1, the articulated bus 1 of the present embodiment includes a front vehicle 2, a rear vehicle 3, and an articulated portion 4.

  The front vehicle 2 is a driven vehicle disposed on the front side in the vehicle longitudinal direction of the articulated bus 1. The front vehicle 2 includes a front chassis frame 21 and a front body 22 connected to the front chassis frame 21.

  The front chassis frame 21 functions as a floor structure of the front vehicle. A floor plate (not shown) of the front vehicle 2 is attached to the front chassis frame 21. The front chassis frame 21 includes at least a pair of rail portions 51 arranged in parallel in the vehicle width direction and extending in the longitudinal direction of the vehicle, and a first transversely extending portion 52 extending in the lateral direction of the vehicle at the rear end in the longitudinal direction See) and. The details of the front chassis frame 21 will be described later.

  The front chassis frame 21 has a front axle (not shown) located on the front side in the vehicle longitudinal direction and connected with the front wheel 23a, and a rear axle located on the rear side in the vehicle longitudinal direction and connected with the rear wheel 23b. A part (not shown) is attached. The front wheel 23a is a steered wheel connected to the steering mechanism. The front wheel 23a and the rear wheel 23b are driven wheels.

  FIG. 2 is a perspective view of the body of the front vehicle as viewed from the rear. As shown in FIG. 2, the front body 22 is a skeleton structure (skeleton structure). Specifically, the front body 22 includes a pair of side structures 24 located on the side of the vehicle, a roof structure 25 located on the top of the vehicle, and a front structure (not shown) located on the front of the vehicle And a rear structural portion 26 positioned on the rear side of the vehicle. That is, the front body 22 constitutes a pentahedron by the pair of side structural parts 24, the roof structural part 25, the front structural part, and the rear structural part 26. The front chassis frame 21 is connected to the lower ends of the pair of side structural parts 24, the front structural part, and the rear structural part 26 by welding or the like.

  The rear structure portion 26 is formed in a horseshoe shape (gate shape) to form an opening 27 for an occupant to move back and forth with the rear vehicle 3. The rear structural portion 26 is formed of a horseshoe-shaped outer bone portion 26a which forms the outer shape of the rear structural portion 26 and is connected to the first transversely extending portion 52, and is disposed on the inner side in the vehicle outer direction than the outer bone portion 26a. (A brace of the horseshoe-shaped inner bone 26b connected to the extension 52, a plurality of connection bones 26c connected to the outer bone 26a and the inner bone 26b, and the outer bone 26a and the inner bone 26b And a pair of left and right auxiliary bones 26e extending from the inner bone 26b at the lower part of the front body 22 to the inside of the vehicle inward and outward and connected to the first transversely extending part 52). , And a plurality of auxiliary connection bone portions 26f connected to the inner bone portion 26b and the auxiliary bone portion 26e.

  The rear vehicle 3 is a drive vehicle disposed behind the articulated bus 1 in the front-rear direction of the vehicle. The rear vehicle 3 includes a rear chassis frame 31 and a rear body 32 connected to the rear chassis frame 31.

  The rear chassis frame 31 functions as a floor structure of the rear vehicle. A floor plate (not shown) of the rear vehicle 3 is attached to the rear chassis frame 31. The rear chassis frame 31 is at least a pair of rail portions 31a arranged in parallel in the vehicle width direction and extending in the vehicle longitudinal direction, and a first laterally extending portion 31b extending in the vehicle width direction at the front end in the vehicle longitudinal direction (see FIG. 3) And.

  Attached to the rear chassis frame 31 are an axle portion (not shown) located at the center in the longitudinal direction of the vehicle and to which the wheels 33 are connected, and an engine E / G located at the rear end in the longitudinal direction of the vehicle. The wheel 33 is a drive wheel connected to the engine E / G via a propeller shaft, a differential gear, and the like.

  The rear body 32 is a skeleton structure (skeleton structure). More specifically, the rear body 32 has a pair of side structures located on the side of the vehicle, a roof structure located on the top of the vehicle, a rear structure located on the rear of the vehicle, and a position on the front of the vehicle And a front structure. That is, the rear body 32 constitutes a pentahedron by the pair of side structural parts, the roof structural part, the rear structural part, and the front structural part. The rear chassis frame 31 is connected to the pair of side structural parts, the rear structural part, and the lower end of the front structural part by welding or the like.

  FIG. 3 is a schematic plan view showing the joint portion. As shown in FIGS. 1 and 3, the joint 4 allows the front chassis frame 21 and the rear chassis frame 31 to be rockable in the vehicle longitudinal direction between the front vehicle 2 and the rear vehicle 3. Do. The joint 4 includes a joint mechanism 41, a passage 42 and a hood 43.

  The joint mechanism 41 has a front chassis frame side connection portion 41 a connected to the first transversely extending portion 52 of the front chassis frame 21 and a rear frame side connected to the first transversely extending portion 31 b of the rear chassis frame 31. And a connection portion 41 b. The front chassis frame side connection portion 41 a and the rear frame side connection portion 41 b are swingably connected between the front vehicle 2 and the rear vehicle 3 with an axis extending in the vertical direction of the vehicle as a swing center. The joint mechanism 41 does not easily connect the front chassis frame 21 and the rear chassis frame 31 detachably like a trailer (tractor), but by fastening the bolts, the front chassis frame 21 and the rear The chassis frame 31 is connected non-removably. However, when there are special circumstances such as maintenance, the front chassis frame 21 and the rear chassis frame 31 can be separated by removing the bolts.

  The passage portion 42 is bridged between the floor plate of the front vehicle 2 and the floor plate of the rear vehicle 3, and is mounted on the articulated mechanism 41. The hood 43 is attached to the front vehicle 2 and the rear vehicle 3 and covers the joint mechanism 41 and the passage 42, and the opening 27 of the rear structure 26 of the front vehicle 2 and the front structure of the rear vehicle 3 Form a passage space in communication with the opening of the

  Next, the front chassis frame 21 will be described in detail.

  FIG. 4 is a schematic perspective view of a front chassis frame. FIG. 5 is a schematic plan view of the front chassis frame. FIG. 6 is a schematic side view of the front chassis frame. FIG. 7 is a schematic perspective view of the front chassis frame from which the reinforcing portion is removed. FIG. 8 is a schematic plan view of the front chassis frame with the reinforcements removed. FIG. 9 is a schematic side view of the front chassis frame with the reinforcement removed. As shown in FIGS. 4 to 9, the front chassis frame 21 includes a pair of rail portions 51, a first laterally extending portion 52, a second laterally extending portion 53, a pair of bent rail portions 54, and a third portion. A laterally extending portion 55, a fourth laterally extending portion 56, and a reinforcing portion 60 are provided. The front chassis frame 21 also includes members other than these.

  As shown in FIGS. 4 to 6, the pair of rail portions 51 are juxtaposed in the vehicle width direction and extend linearly in the vehicle longitudinal direction. The rail portion 51 is a rectangular tubular member (angular pipe) extending linearly.

  The first laterally extending portion 52 linearly extends in the vehicle width direction at the rear end portion in the vehicle longitudinal direction, and is connected to the joint portion 4. For this reason, the first laterally extending portion 52 is also referred to as a bulkhead. The first laterally extending portion 52 is a rectangular tubular member (angular pipe) extending linearly. The connection of the first transversely extending portion 52 to the connecting portion 4 can be performed, for example, by welding or / and bolting. When the left and right outer bones 26a of the rear structural portion 26 are added to the first laterally extending portion 52, the width becomes substantially the same as the vehicle width of the front vehicle 2 (see FIG. 2).

  The second laterally extending portion 53 linearly extends in the vehicle width direction in front of the first laterally extending portion 52 in the vehicle longitudinal direction, and is connected to a rear end portion in the vehicle longitudinal direction of the pair of rail portions 51. For this reason, the second laterally extending portion 53 is also referred to as a cross member. The second laterally extending portion 53 is a rectangular tubular member (angular pipe) extending linearly. The connection of the second laterally extending portion 53 to the rail portion 51 can be performed, for example, by welding all around. The second laterally extending portion 53 is longer than the distance between the pair of rail portions 51, and protrudes outward in the vehicle width direction from the pair of rail portions 51.

  The bent rail portion 54 is arranged in parallel in the vehicle width direction, similarly to the rail portion 51. That is, the right bent rail portion 54 is disposed at the same position in the vehicle width direction as the right rail portion 51, and extends in the vehicle front-rear direction across the axle of the right rear wheel 23b. The left bent rail portion 54 is disposed at the same position in the vehicle width direction as the left rail portion 51, and extends in the vehicle longitudinal direction across the axle of the left rear wheel 23b. The bending rail portion 54 turns up in the vehicle vertical direction of the axle of the rear wheel 23 b and is connected to the first laterally extending portion 52 and the second laterally extending portion 53. The bending rail portion 54 is formed of a square tubular member (square pipe). The bending rail portion 54 is bent so as to wrap around the upper side of the vehicle axle of the rear wheel 23b in the vehicle vertical direction. The bending shape of the bending rail portion 54 can be formed, for example, by joining a plurality of rectangular cylindrical members by welding or the like, or bending the linear rectangular cylindrical member by plastic deformation.

  Specifically, the bending rail portion 54 includes a connection front end portion 54a, a first inclined portion 54b, a horizontal portion 54c, a second inclined portion 54d, and a connection rear end portion 54e.

  The connection front end portion 54 a is a vehicle front-rear direction front end portion of the bending rail portion 54. The connection front end 54a is connected to the upper surface of the rear end of the rail 51 in the vehicle longitudinal direction and the upper surface of the second horizontally extending portion 53, and extends rearward in the vehicle longitudinal direction. The connection of the connection front end portion 54a to the rail portion 51 and the second laterally extending portion 53 can be performed, for example, by welding all around. In the drawing, the front upper portion of the connection front end portion 54a is cut out in a rectangular shape, but the portion does not need to be cut out in particular.

  The first inclined portion 54b extends rearward in the vehicle longitudinal direction while inclining upward in the vehicle vertical direction from the rear end in the vehicle longitudinal direction of the connection front end portion 54a.

  The horizontal portion 54c extends rearward in the vehicle longitudinal direction from the rear end in the vehicle longitudinal direction of the first inclined portion 54b.

  The second inclined portion 54d extends rearward in the vehicle longitudinal direction while inclining downward in the vehicle vertical direction from the rear end in the vehicle longitudinal direction of the horizontal portion 54c.

  The connection rear end portion 54 e extends rearward in the vehicle front-rear direction from the rear end of the second inclined portion 54 d in the vehicle front-rear direction. The rear end surface of the connection rear end portion 54 e is connected to the first laterally extending portion 52. The connection of the connection rear end portion 54e to the first laterally extending portion 52 can be performed, for example, by welding all around.

  The third transversely extending portion 55 is disposed between the first transversely extending portion 52 and the second transversely extending portion 53 in the vehicle longitudinal direction. The third laterally extending portion 55 linearly extends in the vehicle width direction in plan view, and is connected to the connection rear end portion 54 e of the pair of bending rail portions 54. The pair of bent rail portions 54 and the first transverse extending portion 52 and the third transverse extending portion 55 are combined in the form of a parallel cross. The third laterally extending portion 55 is formed of a square tubular member (square pipe). The connection of the third laterally extending portion 55 to the bending rail portion 54 can be performed, for example, by welding all around.

  The third laterally extending portion 55 is divided into five, and a central third laterally extending portion 55a located at the center in the vehicle width direction and a pair of side third laterally extending portions located at both ends in the vehicle width direction 55b, and a pair of coupling portions 55c that couple the central third transversely extending portion 55a and the lateral third transversely extending portions 55b.

  The central third laterally extending portion 55a is disposed at the same position as the first laterally extending portion 52 in the vehicle vertical direction. The central third laterally extending portion 55a extends linearly in the vehicle width direction. The right end of the central third laterally extending portion 55a is connected to the connection rear end 54e through the right connection rear end 54e. The right end portion of the central third laterally extending portion 55a protrudes outward in the vehicle width direction from the connected connection rear end portion 54e. The left end of the central third laterally extending portion 55a is connected to the connection rear end 54e through the left connection rear end 54e. The left end portion of the central third laterally extending portion 55a protrudes outward in the vehicle width direction from the connected connection rear end portion 54e.

  The air suspension receiving portion 57 is connected to the side third laterally extending portion 55b. The air suspension receiving portion 57 is a portion that receives an air bellows (not shown) constituting the air suspension from above. That is, the side third laterally extending portion 55b is disposed above the air suspension receiving portion 57 and is connected to the air suspension receiving portion 57 by welding, bolting, or the like. The air suspension receiving portion 57 is illustrated only in FIGS. 7 to 9.

  The side third laterally extending portion 55b is disposed at the same position as the central third laterally extending portion 55a in the longitudinal direction of the vehicle, and is disposed above the central third laterally extending portion 55a in the longitudinal direction of the vehicle. The side third laterally extending portion 55b extends linearly in the vehicle width direction. The left end of the right side third laterally extending portion 55b is connected to the connection rear end 54e through the right connection rear end 54e. The right side third laterally extending portion 55b extends outward in the vehicle width direction from the connected rear end 54e. The right end of the left side third laterally extending portion 55b passes through the left connection rear end 54e and is connected to the left connection rear end 54e. The left side third laterally extending portion 55b extends outward in the vehicle width direction from the connected rear end 54e.

  The coupling portion 55c is connected to the outer surface in the vehicle width direction of the connection rear end portion 54e, and extends in the vehicle vertical direction along the connection rear end portion 54e. The lower end portion of the connecting portion 55c is connected to a portion protruding from the connection rear end portion 54e located on the outer side in the vehicle width direction of the central third laterally extending portion 55a. The upper end portion of the coupling portion 55c is connected to a connection portion with the connection rear end portion 54e located on the inner side in the vehicle width direction of the side third laterally extending portion 55b.

  The fourth transversely extending portion 56 is disposed between the second transversely extending portion 53 and the third transversely extending portion 55 in the vehicle longitudinal direction. The fourth laterally extending portion 56 linearly extends in the vehicle width direction in a plan view, and is connected to a rear end portion in the vehicle longitudinal direction of the pair of rail portions 51 and a connection front end portion 54a of the pair of bending rail portions 54 . For this reason, a pair of rail part 51, the 2nd horizontal extending part 53, and the 4th horizontal extending part 56 are combined in the shape of a parallel cross. Further, the pair of bending rails 54, the second transverse extending portion 53, and the fourth transverse extending portion 56 are combined in a parallel cross shape. The fourth laterally extending portion 56 is formed of a square tubular member (square pipe). The connection of the fourth laterally extending portion 56 to the rail portion 51 and the bending rail portion 54 can be performed, for example, by welding all around.

  The fourth transversely extending portion 56 is divided into five, and a central fourth transversely extending portion 56a located at the center in the vehicle width direction and a pair of side fourth transversely extending portions located at both ends in the vehicle width direction And 56b, and a pair of connecting portions 56c connecting the central fourth lateral extending portion 56a and the side fourth lateral extending portions 56b.

  The central fourth laterally extending portion 56a is disposed at the same position as the rail portion 51 in the vehicle vertical direction. The central fourth lateral extending portion 56a extends linearly in the vehicle width direction. The right end of the central fourth laterally extending portion 56a is connected to the lower surface of the connection front end 54a so as to support the right connection front end 54a from below. The right end of the central fourth laterally extending portion 56a protrudes outward in the vehicle width direction from the connected connection front end 54a. The left end of the central fourth laterally extending portion 56a is connected to the lower surface of the connection front end 54a so as to support the left connection front end 54a from below. The left end of the central fourth laterally extending portion 56a protrudes outward in the vehicle width direction from the connected connection front end 54a.

  The air suspension receiving portion 57 is connected to the side fourth laterally extending portion 56b in the same manner as the side third laterally extending portion 55b. That is, the side fourth laterally extending portion 56 b is disposed above the air suspension receiving portion 57 and is connected to the air suspension receiving portion 57 by welding, bolting, or the like.

  The side fourth laterally extending portion 56b is disposed at the same position as the central fourth transversely extending portion 56a in the longitudinal direction of the vehicle, and is disposed at the same position as the side third transversely extending portion 55b in the vehicle vertical direction. The side fourth laterally extending portion 56b extends linearly in the vehicle width direction. The left end of the right side fourth lateral extending portion 56b is connected to the connection front end 54a through the right connection front end 54a. The right side fourth laterally extending portion 56b extends outward in the vehicle width direction from the connected front end 54a. Further, the right end of the left side fourth laterally extending portion 56b is connected to the left connection front end 54a through the left connection front end 54a. The left side third laterally extending portion 55b extends outward in the vehicle width direction from the connected front end 54a.

  Coupling portion 56c is connected to the outer surface of connection front end 54a in the vehicle width direction, and extends in the vehicle vertical direction along connection front end 54a. The lower end portion of the coupling portion 56c is connected to a portion protruding from the connection front end portion 54a located on the outer side in the vehicle width direction of the central fourth laterally extending portion 56a. The upper end portion of the coupling portion 56c is connected to a connection portion with the connection front end portion 54a located on the inner side in the vehicle width direction of the side fourth laterally extending portion 56b.

  As shown in FIGS. 4 to 6, the reinforcing portion 60 includes a first reinforcing portion 61 and a second reinforcing portion 62. Other than distinguishing and explaining the first reinforcing portion 61 and the second reinforcing portion 62, they are collectively described as a reinforcing portion 60.

  FIG. 10 is a schematic perspective view of the first reinforcing portion. FIG. 11 is a schematic exploded perspective view of the first reinforcing portion. 12 is a schematic cross-sectional view taken along line XII-XII shown in FIG. FIG. 13 is a schematic cross-sectional view taken along line XIII-XIII shown in FIG. As shown in FIGS. 4 to 6 and 10 to 13, the first reinforcing portion 61 is connected to the first laterally extending portion 52, the second laterally extending portion 53, and the bending rail portion 54. The first reinforcing portion 61 includes a reinforcing bottom plate portion 63 and a pair of reinforcing side plate portions 64.

  The reinforced bottom plate portion 63 includes a first laterally extending portion 52, a second laterally extending portion 53, a central third laterally extending portion 55a (third laterally extending portion 55), and a central fourth laterally extending portion 56a (fourth transversely extending portion 56). ) Is a member connected to the upper surface in the vertical direction of the vehicle. The reinforcement bottom plate portion 63 includes a front reinforcement bottom plate portion 65 and a back reinforcement bottom plate portion 66. The front reinforcement bottom plate portion 65 and the rear reinforcement bottom plate portion 66 are members separated from each other.

  The front reinforcing bottom plate portion 65 is a rectangular flat member extending substantially in the longitudinal direction of the vehicle and in the vehicle width direction. The front reinforcing bottom plate portion 65 extends in the vehicle longitudinal direction through between the pair of bending rail portions 54 (inward of the pair of bending rail portions 54 in the vehicle width direction). The front reinforcement bottom plate portion 65 extends in the vehicle longitudinal direction while curving slightly upward in the vehicle vertical direction so as not to interfere with the axle of the rear wheel 23b. The vehicle front-rear direction front end portion of the front reinforcing bottom plate portion 65 is connected to the upper surface in the vehicle vertical direction of the second transversely extending portion 53 and the central fourth transversely extending portion 56a (the fourth transversely extending portion 56). The vehicle longitudinal direction rear end portion of the front reinforcing bottom plate portion 65 is connected to the upper surface in the vehicle vertical direction of the central third laterally extending portion 55a (third lateral extending portion 55). As will be described later, the rear reinforcing bottom plate portion 66 is also connected to the third laterally extending portion 55. Therefore, the rear end portion of the front reinforcing bottom plate portion 65 in the vehicle longitudinal direction is connected only to the front portion in the vehicle longitudinal direction of the central third laterally extending portion 55a.

  The connection of the front reinforcing bottom plate portion 65 to the second transversely extending portion 53, the central fourth transversely extending portion 56a, and the third transversely extending portion 55 can be performed, for example, by plug welding and fillet welding. Specifically, the front reinforcing bottom plate portion 65 has a hole 65 a for plug welding to the second horizontal extending portion 53 and the center fourth horizontal extending portion 56 a, and a third horizontal extending portion 55. A hole 65b for performing plug welding is formed. A plurality of holes 65 a are formed along the second laterally extending portion 53 and the fourth laterally extending portion 56. A plurality of holes 65 b are formed along the third laterally extending portion 55. The shapes of the holes 65a and the holes 65b can be, for example, a circle, an ellipse, an oval (oblong), or the like. Then, the front reinforcing bottom plate portion 65 and the second laterally extending portion 53, the central fourth laterally extending portion 56a, and the third transversely extending portion 55 are welded on the inner peripheral surfaces of the holes 65a and the holes 65b. Further, the front end in the vehicle longitudinal direction of the front reinforcing bottom plate portion 65 and the second laterally extending portion 53 are welded by fillet welding. Further, the rear end of the front reinforcing bottom plate portion 65 in the vehicle longitudinal direction and the central third laterally extending portion 55a are welded by fillet welding.

  The rear reinforcement bottom plate portion 66 is a T-shaped flat member extending substantially in the longitudinal direction of the vehicle and in the vehicle width direction. A front portion 66A of the rear reinforcing bottom plate portion 66, which is positioned on the front side in the vehicle longitudinal direction, extends inward in the vehicle width direction of the pair of bending rail portions 54 in the vehicle longitudinal direction. The rear side portion 66B of the rear reinforcement bottom plate portion 66 located on the rear side in the vehicle longitudinal direction is a first laterally extending portion to a position outside the bending rail portion 54 in the vehicle width direction behind the bending rail portion 54 in the vehicle longitudinal direction It extends in the vehicle width direction along 52. That is, the rear side portion 66B extends in the vehicle width direction with respect to the front side portion 66A, and is positioned rearward of the bending rail portion 54 in the vehicle longitudinal direction. The front portion 66A is connected to the upper surface of the central third laterally extending portion 55a (the third laterally extending portion 55) in the vehicle vertical direction. As described above, the front reinforcing bottom plate portion 65 is also connected to the central third laterally extending portion 55a. Thus, the front portion 66A is connected only to the rear portion in the vehicle longitudinal direction of the central third laterally extending portion 55a. The rear portion 66B is connected to the upper surface of the first laterally extending portion 52 in the vehicle vertical direction.

  The connection of the rear reinforcement bottom plate portion 66 to the central third laterally extending portion 55a and the first transversely extending portion 52 can be performed, for example, by plug welding and fillet welding. Specifically, in the rear reinforcement bottom plate portion 66, a hole 66a for performing plug welding with respect to the central third laterally extending portion 55a, and for performing plug welding with respect to the first transversely extending portion 52. Holes 66b are formed. A plurality of holes 66a are formed along the central third laterally extending portion 55a. A plurality of holes 66 b are formed along the first laterally extending portion 52. The shapes of the holes 66a and the holes 66b may be, for example, circular, oval, oval (oblong), or the like. Then, on the inner peripheral surfaces of the holes 66a and the holes 66b, the rear side reinforcing bottom plate portion 66 is welded to the central third transversely extending portion 55a and the first transversely extending portion 52. Further, the rear end in the vehicle longitudinal direction of the rear side reinforcing bottom plate portion 66 and the first laterally extending portion 52 are welded by fillet welding. Furthermore, the vehicle front-rear direction front end of the rear side reinforcing bottom plate portion 66 and the central third laterally extending portion 55a are welded by fillet welding.

  The reinforcing side plate portion 64 is a member connected to the front reinforcing bottom plate portion 65 of the reinforcing bottom plate portion 63 and the inner side surface in the vehicle width direction of each of the bending rail portions 54. Of the pair of reinforcing side plate portions 64, the right reinforcing side plate portion 64 is connected to the right end of the front reinforcing bottom plate portion 65 in the vehicle width direction, and the left reinforcing side plate portion 64 is a car of the front reinforcing bottom plate portion 65. It is connected to the left end in the width direction. If it explains concretely, reinforcement side plate part 64 is provided with the 1st reinforcement side plate part 64A, and the 2nd reinforcement side plate part 64B. The first reinforcing side plate portion 64A and the second reinforcing side plate portion 64B are formed by bending the flat reinforcing side plate portion 64 at a substantially right angle.

  The first reinforcing side plate portion 64A is a flat portion extending in the vehicle width direction and the substantially vehicle longitudinal direction. Like the front reinforcing bottom plate portion 65, the first reinforcing side plate portion 64A extends in the vehicle longitudinal direction while curving slightly upward in the vehicle vertical direction so as not to interfere with the axle of the rear wheel 23b. The first reinforcing side plate portion 64A is connected to the lower surface of the front reinforcing bottom plate portion 65 in the vehicle vertical direction at the outer end of the front reinforcing bottom plate portion 65 in the vehicle width direction. The connection of the first reinforcing side plate portion 64A to the front reinforcing bottom plate portion 65 can be performed, for example, by welding.

  The second reinforcing side plate portion 64B is a flat portion extending in the vehicle vertical direction and the vehicle longitudinal direction. The second reinforcing side plate portion 64B faces the inner side surface of the bending rail portion 54 in the vehicle width direction. In this case, the second reinforcing side plate portion 64B may face at least the first inclined portion 54b, the horizontal portion 54c, and the second inclined portion 54d of the bending rail portion 54. The second reinforcing side plate portion 64B may face the connection rear end portion 54e, and may further face the connection front end portion 54a. The second reinforcing side plate portion 64B is connected to the inner side surface of the bending rail portion 54 in the vehicle width direction.

  The connection of the second reinforcing side plate portion 64B to the bending rail portion 54 can be performed, for example, by plug welding and fillet welding. If it demonstrates concretely, the hole 64a for performing plug welding with respect to the bending rail part 54 is formed in the 2nd reinforcement side board part 64B. A plurality of holes 64 a are formed along the bending rail portion 54. That is, a plurality of holes 64b are formed along at least the first inclined portion 54b, the horizontal portion 54c, and the second inclined portion 54d of the bending rail portion 54. When the bending rail portion 54 faces the connection rear end portion 54e, a plurality of holes 64b may be further formed along the connection rear end portion 54e, and when the bending rail portion 54 also faces the connection front end portion 54a. A plurality of holes 64b may be further formed along the connection front end 54a. The shape of the hole 64a can be, for example, a circle, an ellipse, an oval (elliptical), or the like. Then, the second reinforcing side plate portion 64B and the bending rail portion 54 are welded on the inner peripheral surface of the hole 64a. Moreover, the 2nd reinforcement side plate part 64B and the bending | flexion rail part 54 are welded by fillet welding. In this case, the second reinforcing side plate portion 64B and the bending rail portion 54 are intermittently welded in a corner, and the second reinforcing side plate portion 64B is a portion where the second reinforcing side plate portion 64B and the bending rail portion 54 are fillet welded. And the locations where the welding of the bending rail portions 54 is carried out may be alternately arranged along the bending rail portions 54 in a staggered arrangement. Thereby, the space formed by the reinforcement bottom plate portion 63 and the bending rail portion 54 in the side view (FIG. 6) is covered by the second reinforcement side plate portion 64B.

  FIG. 14 is a schematic perspective view of the second reinforcing portion. As shown in FIGS. 4 to 6 and 14, the second reinforcing portion 62 is a member connected to the lower surface of the first laterally extending portion 52 and the bending rail portion 54 in the vehicle vertical direction. The second reinforcing portion 62 includes a front second reinforcing portion 62A, a center second reinforcing portion 62B, and a rear second reinforcing portion 62C. The front second reinforcing portion 62A, the center second reinforcing portion 62B, and the rear second reinforcing portion 62C are formed by bending the flat second reinforcing portion 62.

  The front second reinforcing portion 62A is a flat portion extending rearward in the vehicle vertical direction while being inclined downward in the vehicle vertical direction. The front second reinforcing portion 62A extends in the vehicle width direction so as to be bridged between the pair of second inclined portions 54d. Both ends in the vehicle width direction of the front second reinforcing portion 62A face the lower surface of each second inclined portion 54d in the vehicle vertical direction. The front second reinforcing portion 62 </ b> A extends forward in the vehicle longitudinal direction to a position not in contact with the front reinforcing bottom plate portion 65 of the first reinforcing portion 61. The front second reinforcing portion 62A is connected to the lower surface of the second inclined portion 54d in the vehicle vertical direction.

  The connection of the front second reinforcing portion 62A to the second inclined portion 54d can be performed, for example, by plug welding. If it demonstrates concretely, the hole 62a for performing plug welding with respect to the 2nd inclination part 54d is formed in the front side 2nd reinforcement part 62A. A plurality of holes 62a are formed along the second inclined portion 54d. The shape of the hole 62a can be, for example, a circle, an ellipse, an oval (elliptical), or the like. Then, the front second reinforcing portion 62A and the second inclined portion 54d are welded on the inner peripheral surface of the hole 62a.

  The central second reinforcing portion 62B is a flat portion extending in the vehicle longitudinal direction. The central second reinforcing portion 62B extends in the vehicle width direction so as to bridge the pair of connection rear end portions 54e. Both end portions in the vehicle width direction of the central second reinforcing portion 62B face the connection rear end portions 54e. The central second reinforcing portion 62B is connected to the lower surface of the connection rear end 54e in the vehicle vertical direction.

  The connection of the central second reinforcing portion 62B to the connection rear end portion 54e can be performed, for example, by plug welding. Specifically, the central second reinforcing portion 62B is formed with a hole 62b for plug welding to the connection rear end portion 54e. A plurality of holes 62b are formed along the connection rear end 54e. The shape of the hole 62b can be, for example, a circle, an ellipse, an oval (elliptical), or the like. Then, the central second reinforcing portion 62B and the connection rear end portion 54e are welded on the inner peripheral surface of the hole 62b.

  The rear second reinforcing portion 62C is a flat portion extending in the vehicle longitudinal direction. The rear second reinforcing portion 62C extends in the vehicle width direction along the first laterally extending portion 52 to a position outside the bending rail portion 54 in the vehicle width direction behind the bending rail portion 54 in the vehicle longitudinal direction. That is, the rear second reinforcing portion 62C extends in the vehicle width direction with respect to the central second reinforcing portion 62B, and is positioned rearward of the bending rail portion 54 in the vehicle longitudinal direction. The central second reinforcing portion 62B gradually spreads in the vehicle width direction toward the rear second reinforcing portion 62C. The rear second reinforcing portion 62C is connected to the lower surface of the first laterally extending portion 52 in the vehicle vertical direction.

  The connection of the rear second reinforcing portion 62C to the first transversely extending portion 52 can be performed, for example, by plug welding and fillet welding. Specifically, in the rear second reinforcing portion 62C, a hole 62c for performing plug welding on the first laterally extending portion 52 is formed. A plurality of holes 62 a are formed along the first laterally extending portion 52. The shape of the hole 62c can be, for example, a circle, an ellipse, an oval (elliptical), or the like. Then, on the inner peripheral surface of the hole 62c, the rear second reinforcing portion 62C and the first laterally extending portion 52 are welded. The rear end of the rear second reinforcing portion 62 </ b> C in the vehicle longitudinal direction and the first laterally extending portion 52 are welded by fillet welding.

  Next, how to transmit the driving force in the front vehicle 2 will be described. A case will be considered in which the driving force in the front-rear direction of the vehicle is transmitted from the joint portion 4 to the first laterally extending portion 52 by the propulsive force of the engine E / G. In this case, the driving force transmitted to the first laterally extending portion 52 is a force that pushes the first laterally extending portion 52 forward in the vehicle longitudinal direction and pushes the bending rail portion 54 and the second transversely extending portion 53 forward in the vehicle longitudinal direction . Further, the driving force transmitted to the first laterally extending portion 52 pushes the first reinforcing portion 61 and the second reinforcing portion 62 forward in the vehicle longitudinal direction, and the third laterally extending portion 55, the bending rail portion 54, and the fourth transversely extending portion It becomes a force which pushes 56 and the 2nd side extending part 53 in the direction of vehicles order. Then, these forces become axial force of the rail portion 51 and are transmitted forward in the vehicle longitudinal direction.

  As described above, in the articulated bus 1 according to the present embodiment, since the first reinforcing portion 61 is connected to the first laterally extending portion 52, the second laterally extending portion 53, and the bending rail portion 54, Elastic deformation in the opening and closing direction is suppressed. Thereby, the strength and the rigidity in the vicinity of the articulation 4 of the front vehicle 2 are improved. Moreover, in the pusher-type articulated bus, even when a load is transmitted from the articulated portion 4 to the front vehicle 2, this load can be properly transmitted to the rail portion 51. Thereby, the deformation of the front vehicle 2 can be suppressed.

  Further, in the joint bus 1, the reinforcing bottom plate portion 63 is connected to the upper surfaces of the first laterally extending portion 52 and the second laterally extending portion 53, and the reinforcing side plate portion 64 is provided on the inner side surface of each of the bent rail portions 54. Because of being connected, it is possible to receive the load in the longitudinal direction of the vehicle transmitted from the joint portion 4 to the front vehicle 2 in the shear direction. This further improves the strength and rigidity of the front vehicle 2.

  Further, in the joint bus 1, the rear side portion 66 </ b> B of the rear reinforcing bottom plate portion 66 is disposed rearward of the bending rail portion 54 in the vehicle longitudinal direction. The load can be efficiently transmitted to the bending rail portion 54. Moreover, since the front reinforcing bottom plate portion 65 and the rear reinforcing bottom plate portion 66 having different shapes are separate members, the manufacturing of the reinforcing bottom plate portion 63 is facilitated.

  In addition, in the joint bus 1, the first reinforcing portion 61 is connected to the first laterally extending portion 52, the second laterally extending portion 53, the fourth laterally extending portion 56, and the bending rail portion 54 by plug welding. The first reinforcing portion 61 can be firmly connected to the first laterally extending portion 52, the second laterally extending portion 53, the fourth laterally extending portion 56, and the bending rail portion 54.

  Further, in the articulated bus 1, the first laterally extending portion 52 and the bending rail portion 54 are sandwiched by the rear side reinforcing bottom plate portion 66 and the second reinforcing portion 62. The strength and stiffness of 54 are further improved. Moreover, since the second reinforcing portion 62 is connected to the lower surfaces of the first laterally extending portion 52 and the bending rail portion 54, the second reinforcing portion 62 receives a load in the longitudinal direction of the vehicle transmitted from the joint portion 4 to the front vehicle 2 in the shear direction. be able to. This further improves the strength and rigidity of the front vehicle 2.

  Further, in the joint bus 1, the rear second reinforcing portion 62 </ b> C of the second reinforcing portion 62 is disposed rearward of the bending rail portion 54 in the vehicle longitudinal direction. The load transmitted to can be efficiently transmitted to the bending rail portion 54.

  Further, in the joint bus 1, the second reinforcing portion 62 is connected to the first transversely extending portion 52 and the bending rail portion 54 by plug welding, so that the second reinforcing portion 62 is connected to the first transversely extending portion 52 and the bending rail portion 54. The second reinforcing portion 62 can be firmly connected.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the scope of the invention as set forth in the claims. May be

  For example, although the front chassis frame 21 has been described as including the third transversely extending portion 55 in the above embodiment, the third transversely extending portion 55 may not necessarily be included.

  In the above embodiment, the bending rail portion 54 is described as being connected to the rail portion 51, the second laterally extending portion 53, the fourth laterally extending portion 56, and the first laterally extending portion 52. In order to be connected to the second laterally extending portion 53, it may be connected to at least the second laterally extending portion 53 and the first laterally extending portion 52.

  In the above embodiment, the reinforcement bottom plate portion 63 is described as being divided into the front side reinforcement bottom plate portion 65 and the rear side reinforcement bottom plate portion 66, but in the front side reinforcement bottom plate portion 65 and the rear side reinforcement bottom plate portion 66 It may be an integral member that is not divided.

  Reference Signs List 1 ... articulated bus, 2 ... front vehicle, 3 ... rear vehicle, 4 ... articulated portion, 21 ... front chassis frame (chassis frame), 22 ... front body, 23a ... front wheel, 23b ... rear wheel, 24 ... Side structure portion 25: Roof structure portion 26: Rear structure portion 26a: Outer bone portion 26b: Inner bone portion 26c: Connecting bone portion 26d: Muscle joint bone portion 26e: Auxiliary bone portion 26f: Auxiliary Connection bone portion 27 opening 31 rear chassis frame 31a rail portion 31b first lateral extension 32 rear body 33 wheels 41 joint mechanism 41a front chassis frame side connection Portions 41b: Rear frame side connection portion 42: Passage portion 43: Hood 51: Rail portion 52: First laterally extending portion 53: Second laterally extending portion 54: Flexed rail portion 54a: Connecting front end Part, 54b ... first inclined part, 54c ... horizontal part, 54d ... second inclined part, 54 ... connection rear end, 55 ... third transverse extension, 55a ... central third transverse extension, 55b ... side third transverse extension, 55c ... coupling section, 56 ... fourth transverse extension, 56a ... central fifth Four laterally extending portions 56b: side fourth laterally extending portion 56c: coupling portion 57: air suspension receiving portion 60: reinforcing portion 61: first reinforcing portion 62: second reinforcing portion 62A: front side fourth side Two reinforcements, 62B: central second reinforcement, 62C: rear second reinforcement, 62a: holes, 62b: holes, 62c: holes, 63: reinforced bottom plate, 64: reinforcing side plate, 64A: first reinforcement Side plate portion 64B: second reinforcement side plate portion 64a: hole 64b: hole 65: front reinforcement bottom plate portion 65a: hole 65b: hole 66: rear side reinforcement bottom plate portion 66A: front portion 66B: rear Side part, 66a ... hole, 66b ... hole, E / G ... engine.

Claims (7)

A front vehicle with front and rear wheels attached;
A rear vehicle disposed behind the front vehicle in the front-rear direction of the vehicle;
And an articulation portion pivotally interlocking the front vehicle and the rear vehicle,
The front vehicle chassis frame is
A pair of rail portions arranged in parallel in the vehicle width direction and extending in the longitudinal direction of the vehicle;
A first laterally extending portion extending in a vehicle width direction at a vehicle longitudinal direction rear end portion of the front vehicle and connected to the joint portion;
A second laterally extending portion extending in a vehicle width direction in front of the first laterally extending portion in the vehicle longitudinal direction and connected to a rear end portion of the pair of rail portions in the vehicle longitudinal direction;
A pair of bending rail portions which are juxtaposed in the vehicle width direction and which extend around the vehicle in the vertical direction of the rear wheel and are connected to the first laterally extending portion and the second laterally extending portion;
And a first reinforcing portion connected to the first lateral extending portion, the second lateral extending portion, and the bending rail portion.
Joint bus.   The first reinforcing portion is plate-shaped,
A joint bus according to claim 1. The first reinforcing portion is
A reinforced bottom plate connected to an upper surface of the first laterally extending portion and the second laterally extending portion in the vehicle vertical direction;
And a pair of reinforcing side plate portions connected to the reinforcing bottom plate portion and an inner side surface of each of the bending rail portions in the vehicle width direction.
Joint bus according to claim 1 or 2 . The reinforcement bottom plate portion extends in the vehicle width direction along the first laterally extending portion to a position outside the bending rail portion in the vehicle width direction behind the bending rail portion in the vehicle longitudinal direction.
A connected bus according to claim 3 . The chassis frame further includes a third transverse extending portion and a fourth transverse extending portion disposed between the first transverse extending portion and the second transverse extending portion in the vehicle longitudinal direction,
The third laterally extending portion extends in the vehicle width direction in plan view, and is connected to the bending rail portion,
The fourth laterally extending portion extends in the vehicle width direction in a plan view, and is connected to the bending rail portion in front of the third laterally extending portion in the vehicle longitudinal direction,
The reinforcing bottom plate portion is
A front reinforcing bottom plate connected to an upper surface of the second laterally extending portion and the third laterally extending portion in the vehicle vertical direction;
And a rear reinforcement bottom plate portion divided from the front reinforcement bottom plate portion and connected to an upper surface of the third transversely extending portion and the first transversely extending portion in the vehicle vertical direction,
The front reinforcement bottom plate portion extends in the vehicle longitudinal direction through a space between the pair of bending rail portions.
The rear side reinforcing bottom plate portion extends in the vehicle width direction along the first laterally extending portion to a position outside the vehicle width direction with respect to the bending rail portion at the rear in the vehicle longitudinal direction of the bending rail portion.
A connected bus according to claim 3 . The chassis frame further includes a second reinforcing portion connected to a lower surface of the first laterally extending portion and the bending rail portion in the vehicle vertical direction.
The joint bus according to any one of claims 3 to 5 . The second reinforcing portion extends in the vehicle width direction along the first laterally extending portion to a position outside the bending rail portion in the vehicle width direction behind the bending rail portion in the vehicle longitudinal direction.
The joint bus according to claim 6 .

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