JP7209227B2 - Vehicle body frame structure - Google Patents

Description

The present disclosure relates to a vehicle body frame structure.

Patent Literature 1 illustrates a rear body structure of a bus in which a plurality of cross beams are fixed to a rear surface member of the bus as a skeleton. The plurality of cross beams are vertically spaced apart from each other and extend substantially horizontally in the vehicle width direction.

JP-A-10-250382

When large on-vehicle components (such as a driving battery) are mounted from the rear of a bus (vehicle), it is necessary to provide a rear opening with a large vertical width as a work space on the rear surface of the body.

However, in order to provide a rear opening with a large vertical width in the structure of Patent Document 1, it is necessary to increase the vertical spacing of the cross beams, and increasing the vertical spacing of the cross beams reduces the rigidity of the rear surface of the body. invite.

Accordingly, an object of the present disclosure is to provide a vehicle body frame structure capable of enlarging the rear opening while ensuring the rigidity of the rear surface of the body.

In order to achieve the above object, a first aspect of the present disclosure is a vehicle body frame structure in which the body side surfaces are configured by left and right side frame structures, and the body rear surface is configured by a rear frame structure. The body frame structure is supported from below by a vehicle body frame in which rear end portions of left and right side members extending in the vehicle front-rear direction on both sides in the vehicle width direction are connected by rear end cross members extending in the vehicle width direction. The body frame structure includes left and right rear end pillars, an opening lower edge frame, a first cross frame, and left and right front and rear connecting frames.

The left and right rear end pillars stand and extend vertically on both sides in the vehicle width direction of the rear end of the vehicle where the side frame structure and the rear frame structure intersect. The opening lower edge frame extends in the vehicle width direction above the rear end cross member so as to define the lower edge of the rear opening, and connects the left and right rear end pillars to form a rear skeleton structure. The first cross frame extends in the vehicle width direction in front of the opening lower edge frame and connects the left and right side frame structures. The left and right front-rear connection frames are arranged apart in the vehicle width direction, extend in the vehicle front-rear direction, and connect the opening lower edge frame and the first cross frame.

In the first aspect, the load that is input from the axle of the rear wheel to the rear surface side of the body through the vehicle body frame while the vehicle is running is transmitted from the opening lower edge frame through the left and right front and rear connection frames and the first cross frame. Transmitted to lateral skeletal structures. In this manner, the load input to the rear surface of the body can be distributed and supported by the left and right side skeleton structures via the left and right front and rear connecting frames and the first cross frame, thereby increasing the vertical width of the rear opening. The reduction in rigidity of the rear surface of the body due to (providing a wide space above the opening lower edge frame) can be reliably suppressed by the left and right front and rear connecting frames and the first cross frame. Therefore, the rear opening can be enlarged while ensuring the rigidity of the rear surface of the body.

A second aspect of the present disclosure is the body skeleton structure of the first aspect, comprising one or more second crosses extending in the vehicle width direction above the first cross frame and connecting the left and right side frame structures. Have a frame.

In the second aspect, since the left and right side frame structures are connected by the second cross frame, the load input to one side frame structure can be transmitted to the other side frame structure via the second cross frame. , the rigidity of the entire rear body can be increased. Therefore, it is possible to more reliably suppress the decrease in rigidity of the rear surface of the body due to the enlargement of the rear surface opening.

A third aspect of the present disclosure is the body skeleton structure of the second aspect, wherein the side skeleton structure has left and right intermediate pillars standing at substantially the same vehicle front-rear positions as the first cross frame. The second cross frame connects the left and right intermediate pillars.

In the third aspect, since the second cross frame connects the left and right intermediate pillars standing at substantially the same vehicle front-rear positions as the first cross frame, the rear portion of the body responds to the load input from the first cross frame to the left and right side frame structures. The overall rigidity can be efficiently increased.

A fourth aspect of the present disclosure is the body skeleton structure of the first to third aspects, in which on-vehicle components are mounted on the left and right front and rear connecting frames.

In the fourth aspect, the load input from the on-vehicle component can be distributed and supported by the rear frame structure and the left and right side angle measurement structures. support rigidity can be ensured.

A fifth aspect of the present disclosure is the body skeleton structure of the second or third aspect, in which an on-vehicle component is mounted on the left and right front and rear connection frames, and the mounted on-vehicle component is mounted on the second cross frame. In the fifth aspect, the load input from the on-vehicle parts can be dispersed and supported by the rear frame structure and the left and right side angle measurement structures, so even if the on-vehicle parts are heavy, Also, it is possible to ensure the support rigidity of the vehicle-mounted parts.

Since the vehicle-mounted component is fixed to the second cross frame, the support state of the vehicle-mounted component can be stabilized.

A sixth aspect of the present disclosure is the body skeleton structure of the first to fifth aspects, comprising one or more upper and lower connecting members. The vertical connecting member is arranged between the rear end cross member and the opening lower edge frame to connect the rear end cross member and the opening lower edge frame.

In the sixth aspect, since the opening lower edge frame and the rear end cross member are connected by the vertical connecting member, the rigidity of the rear surface of the body can be further increased.

According to the present disclosure, the rear opening can be enlarged while ensuring the rigidity of the rear surface of the body.

FIG. 2 is a perspective view of the body skeleton structure according to the present embodiment, viewed obliquely from the rear; FIG. 2 is a perspective view of the body skeleton structure of FIG. 1 as viewed obliquely from the front; FIG. 2 is a side view of the body frame structure of FIG. 1 as viewed from the outside in the vehicle width direction; FIG. 2 is a rear view of the body frame structure of FIG. 1 as seen from the rear of the vehicle; FIG. 2 is a plan view of the body skeleton structure of FIG. 1 as viewed from above; FIG. 3 is an enlarged view of a main portion of FIG. 2;

An embodiment of the present invention will be described below with reference to the drawings. In the following description, the left-right direction means the left-right direction when the vehicle faces forward. Arrow FR in the drawing indicates the front of the vehicle, UP indicates the upper direction, and IN indicates the inner side in the vehicle width direction.

As shown in FIGS. 1 to 5, a vehicle 1 according to the present disclosure is a bus including a body frame structure 3 supported from below by a vehicle body frame 2, and a battery is housed at the rear of the vehicle in a cabin 4 where passengers board. A chamber (in-vehicle component storage chamber) 5 is provided. A battery unit 6 (see FIGS. 3 to 5) is mounted in the battery housing chamber 5 as an in-vehicle component for supplying power to a driving motor (not shown). The battery unit 6 of the present embodiment is composed of two batteries 7 arranged so as to overlap vertically, and a battery support frame 8 that connects and integrates the upper and lower batteries 7 . The rear surface of the body is provided with a rear surface opening 9 that opens the battery storage chamber 5 to the rear of the vehicle. The rear opening 9 is formed to have a large horizontal width and a large vertical width so as to effectively function as a working space when the heavy and large battery unit 6 is mounted from the rear of the vehicle.

The vehicle body frame 2 includes a pair of left and right side members 10 extending in the vehicle front-rear direction on both sides in the vehicle width direction, and a plurality of cross members 11 extending in the vehicle width direction and connecting the left and right side members 10 . The side member 10 of this embodiment is a divided type side member that is divided into a plurality of parts in the vehicle front-rear direction, and has left and right rear side members 12 extending in the front-rear direction at the rear end of the vehicle 1 . The multiple cross members 11 include a rear end cross member 13 that connects the rear end portions of the left and right rear side members 12 . Note that the left and right side members 10 may be of a non-divided type (integrated type) that is continuous over the entire vehicle length.

The left and right body side surfaces of the vehicle 1 are each configured by a side frame structure 14 , the body rear surface is configured by a rear frame structure 15 , and the body ceiling surface is configured by a ceiling surface frame structure 16 . A skeletal structure is a structure constructed by crossing and connecting a plurality of frame members. The cross-sectional shape of the frame members constituting the body skeleton structure 3 (including the frame members of the body side surface, the rear surface of the body, and the ceiling surface of the body, as well as the first cross frame 43, the second cross frame 44, and the front-rear connection frame 45, which will be described later) is , U shape, rectangular tubular shape, etc., according to the required strength.

The left and right side skeleton structures 14 are provided with a plurality of pillars 17, a plurality of side frames 18, and a plurality of side connection frames 26, 27, 28 as frame members. The multiple pillars 17 include a rear end pillar 20 , a first rear pillar 21 and a second rear pillar (intermediate pillar) 22 . The multiple side frames 18 include lower side frames 23 , intermediate side frames 24 and upper side frames 25 .

The left and right rear end pillars 20 stand and extend vertically on both sides in the vehicle width direction of the vehicle rear end where the side frame structure 14 and the rear frame structure 15 intersect. fixed. The first rear pillar 21 extends vertically in front of the rear end pillar 20 , and the second rear pillar 22 extends vertically in front of the first rear pillar 21 . The rear end pillar 20 and the first rear pillar 21 are connected by a side connecting frame (first lateral connecting frame 26) extending in the front-rear direction. Similarly, the first rear pillar 21 and the second rear pillar 22 are connected by a side connecting frame (second lateral connecting frame 27) extending in the front-rear direction.

The lower side frame 23 extends in the front-rear direction above the vehicle body frame 2 , and the rear end portion of the lower side frame 23 is fixed to the rear end pillar 20 . A front end portion of the lower side frame 23 is fixed to a side connecting frame (wheel house upper vertical frame 28 ) extending vertically above the vehicle body frame 2 . The intermediate side frame 24 extends in the longitudinal direction above the lower side frame 23 , and the rear side of the intermediate side frame 24 and the lower side frame 23 are connected by the lower portion of the first rear pillar 21 and the wheel house upper vertical frame 28 . . The wheelhouse upper vertical frame 28 is arranged at substantially the same vehicle front-rear position as the second rear pillar 22 (see FIGS. 3 and 6). The upper side frame 25 extends in the front-rear direction above the intermediate side frame 24 , and the upper end portions of the first rear pillar 21 and the upper end portions of the second rear pillar 22 are fixed to the upper side frame 25 .

Below the lower side frame 23, an arch-shaped rear fender 30 that partitions the upper portion of the wheel house 29 is fixed. A rear wheel tire 31 (see FIG. 3) is accommodated in the wheel house 29, and the body frame 2 is supported by a rear wheel axle (not shown) via a suspension (not shown). A reinforcing member 32 that reinforces the rear side of the wheel house 29 is fixed to the upper surface of the rear end cross member 13 behind the rear fender 30 .

The ceiling surface frame structure 16 includes beam-like rear end panels 33, a plurality of ceiling beams 34, and a plurality of ceiling surface connection frames 35 as frame members. 2 ceiling beams 37 are included. The beam-shaped rear end panel 33 extends in the vehicle width direction, and both ends of the beam-shaped rear end panel 33 in the vehicle width direction are fixed to and supported by the upper ends of the rear end pillar 20 and the upper ends of the first rear pillars 21 . The first ceiling beam 36 extends in the vehicle width direction while overlapping the front surface of the beam-shaped rear end panel 33 and fixed, and the other ceiling beams 34 (including the second ceiling beam 37) They are spaced apart from each other in the front-rear direction and extend in the vehicle width direction. Both ends of the other ceiling beam 34 in the vehicle width direction are fixed to and supported by the upper side frame 25 . The ceiling surface connection frame 35 extends in the vehicle front-rear direction and connects the ceiling beams 34 spaced apart in the front-rear direction.

The rear frame structure 15 includes the left and right rear end pillars 20, the beam-shaped rear end panels 33, the left and right rear end frames 40, and the opening lower edge frame 41 as frame members. ) and an upper and lower connection frame 42 . The left and right rear end frames 40 stand up from the upper surfaces of both ends of the rear end cross member 13 in the vehicle width direction and extend upward. The lower portions of the left and right rear end pillars 20 are fixed to the left and right rear end frames 40, respectively.

The opening lower edge frame 41 extends in the vehicle width direction above the rear end cross member 13 and below the center of the vertical height of the rear surface of the body so as to define the lower edge of the rear surface opening 9. 20 are concatenated. Both ends of the opening lower edge frame 41 in the vehicle width direction are placed and fixed to the upper ends of the rear end frames 40 and fixed to the rear end pillars 20 . The left and right upper and lower connecting frames 42 extend vertically between the opening lower edge frame 41 and the reinforcing member 32 , and the upper and lower end portions of the upper and lower connecting frames 42 are connected to the opening lower edge frame 41 and the reinforcing member 32 . fixed respectively. That is, the vertical connection frame 42 and the reinforcing member 32 are disposed between the rear end cross member 13 and the opening lower edge frame 41 to form a vertical connection member that connects the rear end cross member 13 and the opening lower edge frame 41. do. The positions of the left and right vertical connection frames 42 in the vehicle width direction are set to be substantially the same as the positions of the left and right front/rear connection frames 45 described later in the vehicle width direction.

In the present embodiment, the upper edge of the rear opening 9 is defined by the beam-shaped rear end panel 33, and both side edges of the rear opening 9 in the vehicle width direction are defined by the left and right rear end pillars 20. The top edge and both side edges may be defined by other members. For example, an opening upper edge frame extending in the vehicle width direction below the beam-shaped rear end panel 33 and connecting the left and right rear end pillars 20 may be provided, and the upper edge of the rear opening 9 may be defined by the opening upper edge frame. In addition, left and right opening side edge frames are provided to extend vertically inside the left and right rear end pillars 20 in the vehicle width direction and connect the opening lower edge frame 41 and the beam-shaped rear end panel 33, and the left and right opening side edge frames provide a rear surface. The left and right side edges of the opening 9 may be defined.

The body skeleton structure 3 includes a first cross frame 43, upper and lower second cross frames 44, and left and right front and rear connecting frames 45 as frame members. The first cross frame 43 extends in the vehicle width direction in front of the opening lower edge frame 41 and connects the left and right side frame structures 14 . In this embodiment, both ends of the first cross frame 43 in the vehicle width direction are fixed to the vehicle width direction inner surfaces of the left and right wheel house upper vertical frames 28 . Since the wheelhouse upper vertical frame 28 is arranged at substantially the same vehicle front-rear position as the second rear pillar 22 , the second rear pillar 22 stands at substantially the same vehicle front-rear position as the first cross frame 43 .

The upper and lower second cross frames 44 are spaced apart vertically above the first cross frame 43 and extend in the vehicle width direction to connect the left and right side frame structures 14 . A partition wall (not shown) that partitions the vehicle compartment 4 and the battery storage compartment 5 is fixed to the upper and lower second cross frames 44 . In the present embodiment, both vehicle width direction end portions of the second cross frame 44 are fixed to the vehicle width direction inner surfaces of the left and right second rear pillars 22 . The number of second cross frames 44 is not limited to two, and may be one or three or more.

The left and right front-rear connection frames 45 are spaced apart in the vehicle width direction and extend in the vehicle front-rear direction to connect the opening lower edge frame 41 and the first cross frame 43 . In this embodiment, the front end portion of the front/rear connection frame 45 is fixed to the vehicle rear surface of the first cross frame 43, and the rear end portion of the front/rear connection frame 45 is placed and fixed on the upper surface of the opening lower edge frame 41. .

A battery support member 46 that supports the battery unit 6 from the front is fixed to the vehicle rear surface of the second cross frame 44 . The battery unit 6 is placed and fixed on the left and right front and rear connecting frames 45 . A vehicle front portion of the battery unit 6 is fixed to the second cross frame 44 via a battery support member 46 .

According to this embodiment, the load that is input from the axle of the rear wheel to the rear surface side of the body through the body frame 2 while the vehicle 1 is running is applied from the opening lower edge frame 41 to the left and right front and rear connection frames 45 and the first cross frame. 43 to the left and right side skeleton structures 14 . In this manner, the load input to the rear surface of the body can be distributed and supported by the left and right side skeleton structures 14 via the left and right front and rear connection frames 45 and the first cross frames 43 . The left and right front/rear connection frames 45 and the first cross frame 43 can reliably suppress a reduction in the rigidity of the rear surface of the body due to an increase in width (providing a wide space above the opening lower edge frame 41). Therefore, the rear opening 9 can be enlarged while ensuring the rigidity of the rear surface of the body.

Since the left and right side skeleton structures 14 are connected by the second cross frames 44, the load input to one side skeleton structure 14 can be transmitted to the other side skeleton structure 14 via the second cross frames 44, The rigidity of the entire rear body can be increased. Therefore, it is possible to more reliably suppress the deterioration of the rigidity of the rear surface of the body due to the enlargement of the rear surface opening 9 .

Since the second cross frame 44 connects the left and right second rear pillars 22 standing at substantially the same vehicle front-rear position as the first cross frame 43 , the rear portion of the body with respect to the load input from the first cross frame 43 to the left and right side frame structures 14 . The overall rigidity can be efficiently increased.

Since the load input from the battery unit 6 can be distributed and supported by the rear frame structure 15 and the left and right side angle measurement structures, the support rigidity of the heavy battery unit 6 can be ensured.

Since the front portion of the battery unit 6 is fixed to the second cross frame 44, the supporting state of the battery unit 6 can be stabilized.

Further, since the opening lower edge frame 41 and the rear end cross member 13 are connected by the vertical connection frame 42 and the reinforcing member 32, the rigidity of the rear surface of the body can be further increased.

Although the present invention has been described above based on the above embodiments, the present invention is not limited to the contents of the above embodiments, and can be appropriately modified without departing from the scope of the present invention. In other words, all other embodiments, examples, operation techniques, etc. made by those skilled in the art based on this embodiment are naturally included in the scope of the present invention.

For example, in the above embodiment, the battery unit 6 was exemplified as an in-vehicle component, but an in-vehicle component other than the battery unit 6 may be mounted. Further, the number of front and rear connection frames 45 is not limited to two, and may be three or more.

INDUSTRIAL APPLICABILITY The present invention can be applied to vehicles having a body frame structure.

1: Vehicle 2: Body frame 3: Body frame structure 4: Vehicle interior 5: Battery storage compartment 6: Battery unit (on-vehicle component)
9: Rear opening 10: Side member 11: Cross member 12: Rear side member 13: Rear end cross member 14: Side skeleton structure 15: Rear skeleton structure 16: Ceiling surface skeleton structure 20: Rear end pillar 21: First rear pillar 22: Second Rear pillar (middle pillar)
23: Lower side frame 22: Intermediate side frame 23: Upper side frame 29: Wheel house 30: Rear fender 31: Tire 32: Reinforcing member (vertical connecting member)
40: Rear end frame 41: Opening lower edge frame 42: Upper and lower connection frame (upper and lower connection member)
43: First cross frame 44: Second cross frame 45: Front/rear connection frame

Claims (6)

The rear ends of left and right side members extending in the vehicle front-rear direction on both sides in the vehicle width direction are supported from below by a body frame connected by a rear end cross member extending in the vehicle width direction, and the body side surfaces are supported by left and right side frame structures. A body frame structure for a vehicle in which the rear surface of the body is configured by a rear frame structure,
left and right rear end pillars that stand and extend vertically on both sides in the vehicle width direction of a vehicle rear end where the side frame structure and the rear frame structure intersect;
an opening lower edge frame extending in the vehicle width direction above the rear end cross member so as to define the lower edge of the rear opening, connecting the left and right rear end pillars to form the rear skeleton structure;
a first cross frame that extends in the vehicle width direction in front of the opening lower edge frame and connects the left and right side frame structures;
A body frame structure for a vehicle, comprising left and right front-rear connection frames that are spaced apart in a vehicle width direction and extend in the vehicle front-rear direction to connect the opening lower edge frame and the first cross frame. A body skeleton structure according to claim 1, comprising:
A body frame structure for a vehicle, comprising: one or a plurality of second cross frames extending in the vehicle width direction above the first cross frame and connecting the left and right side frame structures. A body skeleton structure according to claim 2,
The side frame structure has left and right intermediate pillars standing at substantially the same vehicle front-rear positions as the first cross frame,
The vehicle body frame structure, wherein the second cross frame connects the left and right intermediate pillars. The body skeleton structure according to any one of claims 1 to 3,
A body frame structure for a vehicle, wherein vehicle-mounted parts are mounted on the left and right front and rear connection frames. A body skeleton structure according to claim 2 or claim 3,
In-vehicle parts are mounted on the left and right front and rear connection frames,
The vehicle body frame structure, wherein the mounted on-vehicle component is fixed to the second cross frame. The body skeleton structure according to any one of claims 1 to 5,
A vehicle body skeleton, comprising: one or more upper and lower connecting members arranged between the rear end cross member and the opening lower edge frame to connect the rear end cross member and the opening lower edge frame. structure.

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