JP7232421B2 - Vehicle floor panel reinforcement structure - Google Patents

Description

The present disclosure relates to a vehicle floor panel reinforcing structure.

Patent Literature 1 describes a cab floor reinforcing structure. The cab floor consists of a floor tunnel formed in the center of the front part and flat cab floors formed on both sides via a step. An underframe is fixed to the cab floor portion of the cab floor. The underframe has an inverted hat-shaped cross section with a brim. The reinforcing structure consists of a plurality of reinforcing members arranged over substantially the entire floor tunnel portion. The reinforcing members are arranged to extend at appropriate intervals along the longitudinal direction of the vehicle, and the side ends of the respective reinforcing members are fixed to the brim of the underframe. The reinforcing member has an inverted hat shape with a U-shaped cross section. The reinforcement member is fixed to the flange portion of the floor tunnel portion and to the brim of the underframe.

JP-A-2000-135989

In some cases, the cab is supported from the body frame side by front cab mounts provided at the front ends of the left and right underframes and rear cab mounts provided at the rear ends of the left and right underframes. The load from the body frame side is input to the left and right underframes via the front cab mount and the rear cab mount, so it is input to the left and right underframes (for example, the right side) from the front cab mount. If the load is greater than the load applied to the other side (for example, the left side) of the underframe, the cab may undergo torsional deformation.

In the cab floor reinforcing structure described in Patent Document 1, a reinforcing member is provided between the left and right underframes, but the load that is input from the front cab mount to one of the left and right underframes is input to the other side of the underframe. If the load is larger than the load, depending on the magnitude of the load applied to one side of the underframe, the fixing portion between the side end of the reinforcing member and the brim of the underframe may be deformed, and the cab may be torsionally deformed.

Accordingly, an object of the present disclosure is to provide a vehicle floor panel reinforcing structure capable of suppressing torsional deformation of the cab.

In order to solve the above problems, a first aspect of the present invention is a vehicle floor panel reinforcing structure in which a floor panel of a cab is supported from below by a vehicle body frame via a front cab mount. A frame and a reinforcing member are provided. Each of the left and right underframes has a support area at its front end that is supported from below by the front cab mount, extends in the front-rear direction along the lower surface of the floor panel on both sides in the vehicle width direction of the vehicle, and is fixed to the floor panel. . The reinforcing member extends in the vehicle width direction between the left and right frame fixing portions fixed to the left and right underframes in a state of covering at least part of the support area of the left and right underframes from below, and the left and right frame fixing portions. and a panel fixing portion that connects the left and right frame fixing portions to each other and is fixed to the floor panel between the left and right underframes. The panel fixing portion of the reinforcing member defines a closed space extending in the vehicle width direction between the floor panel between the left and right underframes. The left and right frame fixing portions of the reinforcing member are sandwiched between the front cab mount and the support areas of the left and right underframes.

In the above configuration, the left and right frame fixing portions of the reinforcing member are fixed to the left and right underframes in such a manner as to cover from below at least a portion of the support area of the left and right underframes that is supported from below by the front cab mount. , is sandwiched between the front cab mount and the support areas of the left and right underframes. Therefore, when the vehicle vibrates, the load from the vehicle body frame side is directly input to the reinforcing member from the front cab mount.

In addition, the reinforcing member has left and right frame fixing portions sandwiched between the front cab mount and the support regions of the left and right underframes, and the panel fixing portion extends in the vehicle width direction between the left and right frame fixing portions to extend to the left and right sides. frame fixing parts. That is, the reinforcing member connects the supporting regions of the left and right underframes by itself. Further, the panel fixing portion of the reinforcing member is fixed to the floor panel between the left and right underframes, and defines a closed space extending in the vehicle width direction between the left and right underframes and the floor panel between the left and right underframes. The rigidity of the floor panel between the support areas of the underframe can be ensured.

Therefore, even if the load input from the front cab mount to one of the left and right underframes is greater than the load input to the other underframe, the load input from the front cab mount to the underframe on the one side can be directly input to the covering portion on one side of the reinforcing member and efficiently transmitted to the underframe side on the other side via the panel fixing portion, so that torsional deformation of the cab can be suppressed. .

A second aspect of the present invention is the vehicle floor panel reinforcement structure according to the first aspect, wherein a region where the support regions of the left and right underframes overlap the left and right frame fixing portions of the reinforcing member includes a front cab A fixing portion is provided for fixing the mount and the left and right underframes.

In the above configuration, the fixing portions for fixing the left and right underframes to the front cab mount are provided in the regions where the support regions of the left and right underframes and the left and right frame fixing portions of the reinforcing member overlap each other. The support areas of the left and right underframes and the left and right frame fixing portions of the reinforcing member are integrated at the fixing portion. Therefore, the front cab mount, the support areas of the left and right underframes, and the left and right frame fixing portions of the reinforcing member can be firmly fixed, so that the load input from the front cab mount to the underframe on one side can be reinforced. The force can be transmitted to the underframe on the other side more efficiently via the member, and torsional deformation of the cab can be suppressed.

According to the present disclosure, torsional deformation of the cab can be suppressed.

1 is a front perspective view of a vehicle to which a floor panel reinforcing structure according to an embodiment of the invention is applied; FIG. It is a bottom view of a cab. FIG. 4 is a perspective view of the front end portion of the floor panel as viewed from above; FIG. 3 is an enlarged view of part IV of FIG. 2; 5 is a bottom view of the cab corresponding to FIG. 4 with the front cab mount attached; FIG. 5 is a sectional view taken along the line VI-VI in FIG. 4; FIG.

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

As shown in FIG. 1, a vehicle 1 to which the floor panel reinforcing structure according to the present embodiment is applied is a cab-over type vehicle 1 in which a cab 2 is arranged generally above an engine (not shown). has a vehicle body frame 3 that supports from below. The front end side of the cab 2 is supported from the body frame 3 side via a front cab mount 6, which will be described later, and the rear end side of the cab 2 is supported from the body frame 3 side via a rear cab mount (not shown). .

The body frame 3 includes a pair of left and right side members 4 extending in the longitudinal direction below the cab 2 and a plurality of cross members 5 extending in the vehicle width direction between the left and right side members 4 and connecting the left and right side members 4 to each other. and A front cab mount 6 that supports the front end side of the cab 2 from below is fixed above the front end portions of the left and right side members 4 of the vehicle body frame 3 .

The front cab mount 6 includes left and right cab mount brackets 7 fixed to the left and right side members 4 , cylindrical mount tubes 8 elastically supported by the left and right cab mount brackets 7 , and left and right mount tubes 8 fixed to the mount tubes 8 . and a lever bracket 9 of . At the upper ends of the right and left cab mount brackets 7, mount tube support portions 10 are provided with cylindrical mount rubbers (not shown) penetrating in the vehicle width direction. Mount tubes 8 are inserted through mount rubbers of mount tube support portions 10 of left and right cab mount brackets 7 . The mount tube 8 extends in the vehicle width direction with both left and right ends elastically supported by the mount tube support portions 10 of the left and right cab mount brackets 7 . The left and right lever brackets 9 are fixed to the mount tube 8 between the left and right cab mount brackets 7 and extend rearward. The left and right lever brackets 9 are composed of a bracket upper plate portion 11 (see FIG. 5) fixed to the cab 2 side, and left and right lever brackets extending downward from the left and right ends of the bracket upper plate portion 11 and fixed to the mount tube 8 . and a bracket side plate portion 12 respectively.

As shown in FIGS. 2 and 3, the cab 2 has a floor panel 13 supported from below by the body frame 3 via the front cab mount 6 and the like. The floor panel 13 is formed in a plate shape crossing the vertical direction. The floor panel 13 integrally includes a middle panel portion 13a positioned in the center in the vehicle width direction, a left panel portion 13b positioned on the left side of the middle panel portion 13a, and a right panel portion 13c positioned on the right side of the middle panel portion 13a. have in The middle panel portion 13a extends in the front-rear direction from the front end side to the rear end side of the floor panel 13 while protruding upward from the left panel portion 13b and the right panel portion 13c. The length in the vehicle width direction of the rear end side of the middle panel portion 13a is longer than the length in the vehicle width direction of the front end side of the middle panel portion 13a. On the lower surface 14 of the floor panel 13 are a pair of left and right underframes 15 arranged in the vehicle width direction and extending in the front-rear direction, and a gusset plate (reinforcing member) 16 connecting the front ends of the left and right underframes 15 to each other. is fixed.

As shown in FIG. 2, the left and right underframes 15 are fixed to the lower surface 14 of the left panel portion 13b and the right panel portion 13c of the floor panel 13, and the inner end portions of the left panel portion 13b and the right panel portion 13c in the vehicle width direction. extends in the front-rear direction along the The underframe 15 includes a pair of left and right frame vertical plate portions 17 intersecting the vehicle width direction, a frame bottom plate portion 18 connecting the lower ends of the left and right frame vertical plate portions 17, and the upper ends of the left and right frame vertical plate portions 17. The floor panel 13 has left and right flange portions 19 extending in directions away from each other, and is formed in a hat-shaped cross section that opens upward and extends from the front end portion to the rear end portion of the floor panel 13 . The left and right flange portions 19 are spaced apart from each other in the left and right direction, and are joined and fixed to the lower surface 14 of the floor panel 13 (the lower surfaces 14 of the left panel portion 13b and the right panel portion 13c). The left and right frame vertical plate portions 17 are spaced apart from each other in the left and right direction, and extend downward from the lower surface 14 side of the floor panel 13 . The frame bottom plate portion 18 is arranged at a position spaced downward from the bottom surface 14 of the floor panel 13 . The internal space of the underframe 15 is a closed space whose upper part is blocked by the floor panel 13 .

As shown in FIGS. 4 and 5 , left and right lever brackets 9 of the front cab mount 6 are fixed to the front ends of the left and right underframes 15 . The frame bottom plate portions 18 of the left and right underframes 15 have support regions 20 (regions surrounded by two-dot chain lines 20 in FIG. 4) supported from below by the bracket upper plate portions 11 of the left and right lever brackets 9 . In the support area 20 of the frame bottom plate portion 18 of the left and right underframes 15, a plurality of (three in this embodiment) bolt insertion holes (fixing portions) for fixing the bracket upper plate portions 11 of the left and right lever brackets 9 are provided. 26 are formed spaced apart from each other in the fore and aft. In FIG. 5, illustration of the left and right cab mount brackets 7 of the front cab mount 6 is omitted.

As shown in FIGS. 4 to 6, the gusset plate 16 is formed in a plate shape extending in the vehicle width direction while intersecting the vertical direction, and is fixed to the floor panel 13 and the left and right underframes 15 . The gusset plate 16 extends in the vehicle width direction between left and right frame fixing portions 21 fixed to the front end portions of the left and right underframes 15 and between the left and right frame fixing portions 21 and is attached to the front end portion of the middle panel portion 13 a of the floor panel 13 . and a panel fixing portion 22 fixed to the lower surface 14 of the.

The left and right frame fixing portions 21 of the gusset plate 16 are formed to have a hat-shaped cross section so as to cover the front end portions of the left and right underframes 15 having a hat-shaped cross section from below. That is, the left and right frame fixing portions 21 cover the left and right flange covering portions 23 that cover the left and right flange portions 19 of the left and right underframes 15 from below, and cover the left and right frame vertical plate portions 17 of the left and right underframes 15 from the outside. It has left and right vertical plate covering portions 24 and a bottom plate covering portion 25 that covers the frame bottom plate portion 18 from below. The left and right flange covering portions 23 are fixed to the left and right flange portions 19 of the underframe 15 in surface contact (for example, by spot welding). The left and right vertical plate covering portions 24 are arranged at positions spaced outward from the left and right frame vertical plate portions 17 of the underframe 15 . The bottom plate covering portion 25 is in surface contact with the frame bottom plate portion 18 from below while covering a part of the front end side of the support region 20 of the frame bottom plate portion 18 of the underframe 15 from below. In the support area 20 of the frame bottom plate portion 18 of the left and right underframes 15, the area covered by the bottom plate covering portion 25 of the left and right frame fixing portions 21 of the gusset plate 16 is provided with the bracket upper plate portions 11 of the left and right lever brackets 9. One bolt insertion hole 26 (in this embodiment, the most forward bolt insertion hole 26) is arranged among a plurality of bolt insertion holes 26 for fixing the . The bottom plate covering portions 25 of the left and right frame fixing portions 21 are formed with bolt insertion holes (fixing portions) 27 that communicate with the bolt insertion holes 26 of the support areas 20 of the frame bottom plate portions 18 of the left and right underframes 15 .

The panel fixing portion 22 of the gusset plate 16 extends in the vehicle width direction between the left and right frame fixing portions 21 to connect the left and right frame fixing portions 21 to each other. The panel fixing portion 22 has a middle plate portion 28 that extends linearly in the vehicle width direction between the flange covering portions 23 on the inner side in the vehicle width direction of the left and right frame fixing portions 21 and connects the flange covering portions 23 on the inner side in the vehicle width direction. , a front plate portion 29 extending forward from the front end of the intermediate plate portion 28 and a rear plate portion 30 extending rearward from the rear end of the intermediate plate portion 28 . The intermediate plate portion 28 is arranged at a position spaced downward from the intermediate panel portion 13 a of the floor panel 13 . The front plate portion 29 and the rear plate portion 30 are fixed to the middle panel portion 13a of the floor panel 13 while being in surface contact (for example, by spot welding). That is, the panel fixing portion 22 defines a closed space 31 extending in the vehicle width direction between itself and the middle panel portion 13 a of the floor panel 13 .

As shown in FIG. 5 , the bracket upper plate portion 11 of the left and right lever brackets 9 of the front cab mount 6 includes bolts that pass through the plurality of bolt insertion holes 26 of the left and right underframes 15 and the bolt insertion holes 27 of the gusset plate 16 . 32 are fastened and fixed to the left and right underframes 15 and gusset plates 16 . With the left and right lever brackets 9 of the front cab mount 6 fixed to the left and right underframes 15 and the gusset plate 16, the rear end sides of the bottom plate covering portions 25 of the left and right frame fixing portions 21 of the gusset plate 16 are The support area 20 of the frame bottom plate portion 18 of the underframe 15 and the bracket upper plate portions 11 of the left and right lever brackets 9 are sandwiched.

In the above configuration, with the left and right lever brackets 9 of the front cab mount 6 fixed to the left and right underframes 15 and the gusset plate 16, the bottom plate covering portions 25 of the left and right frame fixing portions 21 of the gusset plate 16 are The support area 20 of the frame bottom plate portion 18 of the underframe 15 and the bracket upper plate portions 11 of the left and right lever brackets 9 are sandwiched. Therefore, when the vehicle 1 vibrates, the load (vertical load) from the vehicle body frame 3 side is directly input to the gusset plate 16 from the front cab mount 6 .

The left and right frame fixing portions 21 of the gusset plate 16 are sandwiched between the support regions 20 of the frame bottom plate portions 18 of the left and right underframes 15 and the bracket upper plate portions 11 of the left and right lever brackets 9, respectively. 22 extends in the vehicle width direction between the left and right frame fixing portions 21 and connects the left and right frame fixing portions 21 to each other. That is, the gusset plate 16 connects the support areas 20 of the frame bottom plate portions 18 of the left and right underframes 15 with each other by the gusset plate 16 alone. Further, the panel fixing portion 22 of the gusset plate 16 is fixed to the middle panel portion 13a of the floor panel 13 (the floor panel 13 between the left and right underframes 15), and is spaced between the middle panel portion 13a in the vehicle width direction. Since the extended closed space 31 is defined, the rigidity of the floor panel 13 between the support areas 20 of the left and right underframes 15 can be ensured.

Therefore, according to the present embodiment, even if the load input from the front cab mount 6 to one of the left and right underframes 15 is greater than the load input to the underframe 15 on the other side, the front cab mount 6 Since the load input to the underframe 15 on the one side can be efficiently transmitted to the underframe 15 on the other side via the gusset plate 16, torsional deformation of the cab 2 can be suppressed.

In addition, in the support region 20 of the frame bottom plate portion 18 of the left and right underframes 15, the region covered with the bottom plate covering portion 25 of the left and right frame fixing portions 21 of the gusset plate 16 has bracket upper plates of the left and right lever brackets 9. Bolt insertion holes 26 are arranged for fixing the portion 11 , and the bottom plate covering portions 25 of the left and right frame fixing portions 21 of the gusset plate 16 communicate with the bolt insertion holes 26 of the support regions 20 of the left and right underframes 15 . A bolt insertion hole 27 is formed. Therefore, while the front cab mount 6 is fixed to the cab 2 , the front cab mount 6 , the left and right underframes 15 , and the left and right frame fixing portions 21 of the gusset plate 16 are integrated by the bolts 32 . Therefore, the support areas 20 of the front cab mount 6, the left and right underframes 15, and the left and right frame fixing portions 21 of the gusset plate 16 can be firmly fixed. The load input to the frame 15 can be more efficiently transmitted to the underframe 15 on the other side via the gusset plate 16, and torsional deformation of the cab 2 can be suppressed.

In the present embodiment, bolt insertion holes 26 and 27 are provided in regions where the support regions 20 of the frame bottom plate portions 18 of the left and right underframes 15 and the bottom plate covering portions 25 of the left and right frame fixing portions 21 of the gusset plate 16 overlap. However, it is not necessary to provide the bolt insertion holes 26 and 27 in the region where the support region 20 of the frame bottom plate portion 18 and the bottom plate covering portion 25 of the gusset plate 16 overlap. That is, the bottom plate covering portions 25 of the left and right frame fixing portions 21 of the gusset plate 16 are not fixed to the support regions 20 of the left and right underframes 15, and the support regions 20 of the left and right underframes 15 and the front cab mount 6 are separated from each other. It may be sandwiched between the bracket upper plate portions 11 of the left and right lever brackets 9 .

In addition, in the present embodiment, the middle panel portion 13a of the floor panel 13 between the left and right underframes 15 projects upward beyond the left panel portion 13b and the right panel portion 13c, but the present invention is not limited to this. , the middle panel portion 13a between the left and right underframes 15 may be arranged at substantially the same height position as the left panel portion 13b and the right panel portion 13c, or may be arranged below the left panel portion 13b and the right panel portion 13c. .

In this embodiment, the front cab mount 6 is configured by the left and right cab mount brackets 7, the mount tubes 8, and the left and right lever brackets 9. Other configurations may be used as long as the front cab mount 6 supports the floor panel 13 below the front end of the cab 2 from below.

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.

The floor panel reinforcing structure according to the present disclosure can be widely applied to vehicles in which the floor panel of the cab is supported from below by the vehicle body frame via the front cab mount.

1: Vehicle 2: Cab 3: Body Frame 6: Front Cab Mount 13: Floor Panel 15: Left and Right Under Frames 16: Gusset Plate (Reinforcing Member)
20: Support areas for left and right underframes 21: Left and right frame fixing parts 22: Panel fixing parts 26, 27: Bolt insertion holes (fixing parts)
31: closed space

Claims (2)

A vehicle floor panel reinforcing structure in which a cab floor panel is supported from below by a vehicle body frame via a front cab mount,
Left and right sides 1 each having a support region at the front end portion to be supported from below by the front cab mount, extending in the front-rear direction along the lower surface of the floor panel on both sides in the vehicle width direction of the vehicle, and fixed to the floor panel. a pair of underframes;
Left and right frame fixing portions fixed to the left and right underframes in a state of covering at least part of the support regions of the left and right underframes from below; a reinforcing member having a panel fixing portion that connects the left and right frame fixing portions to each other and is fixed to the floor panel between the left and right underframes,
The panel fixing portion of the reinforcing member defines a closed space extending in the vehicle width direction between the floor panel between the left and right underframes,
The vehicle floor panel reinforcement structure, wherein the left and right frame fixing portions of the reinforcing member are sandwiched between the front cab mount and the support regions of the left and right underframes. The vehicle floor panel reinforcement structure according to claim 1,
A fixing portion for fixing the front cab mount and the left and right underframes is provided in a region where the support regions of the left and right underframes overlap the left and right frame fixing portions of the reinforcing member. vehicle floor panel reinforcement structure.

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