JP7290125B2 - Cab floor panel reinforcement structure - Google Patents

Description

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

Patent Literature 1 describes an underframe structure for a cab of a vehicle. The underframe unit has a first underframe member that is integrally formed by pressing, and a second underframe member that is obtained by integrating left and right underframe elements press-formed in advance by welding means. Then, the first underframe member and the second underframe member are welded to manufacture the underframe unit. The height dimension of the rising portions of the left and right underframe elements can be freely set.

JP-A-9-175432

By the way, the floor panel of the cab has a front part of the front floor, a rear part of the floor located above the front part of the floor, and a floor connecting the rear end of the front part and the front part of the rear part of the floor. A kick-up portion may be provided. In this case, if a forward load is applied to the rear part of the floor (for example, from a seat) in the event of a vehicle collision, there is a possibility that the bent part between the front part of the floor and the floor kick-up part will be deformed. It is necessary to ensure the strength of the bending portion between the floor front portion and the floor kick-up portion by the frame.

In the cab underframe disclosed in Patent Document 1, the strength of the cab underframe is ensured by increasing the height dimension of the left and right underframe elements that constitute the second underframe member. However, since the second underframe member protrudes greatly downward, there is a risk of narrowing the space below the cab (for example, the engine room, etc.).

Accordingly, an object of the present disclosure is to provide a cab floor panel reinforcement structure that can secure the strength of the bent portion between the floor front portion and the floor kick-up portion while securing the space below the cab.

In order to solve the above-described problems, a first aspect of the present invention provides a front floor, a rear floor positioned above the front floor, and a front floor and rear floor. A floor panel reinforcing structure for a cab for reinforcing a floor panel having a floor kick-up section between, comprising an underframe and a reinforcing member. The underframe has left and right frame vertical plate portions that are fixed to the lower surface of the floor panel and extend downward, and a frame bottom plate portion that connects the lower ends of the left and right frame vertical plate portions to each other. It extends in the front-rear direction along the line to define an internal space between itself and the floor panel, and supports the floor panel from below. The reinforcing member is formed in a plate-like shape that intersects with the vertical direction, and has reinforcing horizontal plate portions that are fixed to the left and right frame vertical plate portions at both left and right end sides, and is arranged in the inner space of the underframe to extend the underframe. It extends in the longitudinal direction along the installation direction and reinforces the underframe. The underframe includes a frame front portion extending in the front-rear direction along the lower surface of the floor front portion, and a frame kick-up portion extending upward along the lower surface of the floor kick-up portion continuously from the rear end side of the front frame portion. and a bent portion between the frame front portion and the frame kick-up portion . The frame bottom plate portion includes a frame front rear region forming a rear portion of the frame front portion, a frame kick-up portion lower region forming a lower portion of the frame kick-up portion, a rear end of the frame front rear region and the frame kick-up portion. and a curved region that is curved with the lower end of the up portion lower region to form a bent portion. The reinforcing member is disposed in the inner section of the underframe including the rear portion of the frame front portion, the lower portion of the frame kick-up portion, and the bent portion . The reinforcing horizontal plate portion of the reinforcing member has a front region facing the frame front rear region of the frame bottom plate portion from above, a rear region facing the frame kick-up portion lower region of the frame bottom plate portion from above, and a side view. has a linear region that extends linearly rearward and upward from the rear end of the front region to the lower end of the rear region and faces the curved region of the frame bottom plate portion from above . The lower portion of the floor kick-up portion, the frame kick-up portion lower side area of the frame bottom plate portion, and the rear side area of the reinforcing horizontal plate portion are arranged substantially parallel and separated from each other. The rear area and the linear area of the reinforcing horizontal plate part divide the inner space of the lower part and the bent part of the frame kick-up part into upper and lower parts.

In the above configuration, the linear region of the reinforcing horizontal plate portion of the reinforcing member extends linearly rearward and upward from the frame front portion side toward the frame kick-up portion side in a side view, and is opposed to the curved region of the frame bottom plate portion. arranged in a string. Therefore, when a forward load is input to the rear part of the floor (for example, from a seat) in the event of a vehicle collision, the forward load is input to the upper end of the frame kick-up portion, When the bent portion with the frame kick-up portion tries to deform, the linear region of the reinforcing horizontal plate portion of the reinforcing member is stretched between the frame bottom plate portion at the front portion of the frame and the frame bottom plate portion at the frame kick-up portion. Deformation of the bent portion between the frame front portion and the frame kick-up portion can be suppressed. As a result, the strength of the bent portion between the floor front portion and the floor kick-up portion of the floor panel can be ensured.

Further, since the reinforcing member for reinforcing the underframe is arranged in the internal space of the underframe, the reinforcing member does not protrude below the underframe. In this way, since the underframe is reinforced in the internal space of the underframe, there is no need to provide a reinforcing member below the underframe, and the space below the cab can be secured.

Therefore, according to the above configuration, it is possible to secure the strength of the bent portion between the floor front portion and the floor kick-up portion while securing the space below the cab.
In addition, the rear area and the linear area of the reinforcing horizontal plate portion vertically divide the internal space of the lower portion of the frame kick-up portion and the bent portion. That is, the inner space of the underframe has a multi-layer cross-sectional structure in which closed cross sections are stacked vertically in addition to the bent portions between the frame front portion and the frame kick-up portion, and above the bent portions. Thus, by forming the inside of the underframe into a multi-layer cross-sectional structure, the strength of the underframe and the reinforcing member can be ensured, and the strength of the floor panel can be ensured.

A second aspect of the present invention is the cab floor panel reinforcing structure according to the first aspect, wherein the reinforcing members extend upward from the left and right ends of the reinforcing horizontal plate portion and are fixed to the left and right frame vertical plate portions. It has left and right reinforcing vertical plate portions that are attached.

In the above configuration, the reinforcing member has the left and right reinforcing vertical plate portions that extend upward from the left and right ends of the reinforcing horizontal plate portion and are fixed to the left and right frame vertical plate portions. That is, the reinforcing member has a U-shaped cross section that opens upward and extends in the front-rear direction along the extension direction of the underframe. Therefore, when the bent portion between the front portion of the frame and the kick-up portion of the frame attempts to deform in the event of a vehicle collision, deformation of the reinforcing horizontal plate portion of the reinforcing member can be suppressed by the left and right reinforcing vertical plate portions. Deformation of the bent portion between the frame front portion and the frame kick-up portion can be suppressed, and the strength of the bent portion between the floor front portion and the floor kick-up portion can be secured.

A third aspect of the present invention is the cab floor panel reinforcing structure according to the first aspect or the second aspect, wherein at least one of the curved region of the frame bottom plate portion and the linear region of the reinforcing member includes: A bead is formed that protrudes upward and extends from the one front end side to the rear end side.

In the above configuration, at least one of the curved region of the frame bottom plate portion and the linear region of the reinforcing member is formed with a bead that protrudes upward and extends from the front end side to the rear end side of the one. can be secured by the bead. Therefore, deformation of at least one of the curved region of the bottom plate portion of the frame and the linear region of the reinforcing member can be suppressed when the bent portion between the front portion of the frame and the kick-up portion of the frame attempts to deform in the event of a vehicle collision. Therefore, the strength of the bent portion between the floor front portion and the floor kick-up portion can be further ensured.

Further, since the bead is formed in a state of protruding upward, even if it is formed in the curved region of the frame bottom plate portion, unlike the case where the bead protrudes downward, the amount of downward protrusion of the underframe is reduced. It can be suppressed, and the space under the cab can be secured.

A fourth aspect of the present invention is the floor flannel reinforcing structure for a cab according to any one of the first to third aspects, wherein the front region of the reinforcing horizontal plate portion is separated from the frame bottom plate portion. Further, it is arranged at a position spaced apart from the floor panel , and divides the internal space of the front part of the frame into upper and lower parts.

In the above configuration , the front region is arranged at a position spaced apart from the bottom plate portion of the frame and spaced apart from the floor panel, and divides the internal space of the front portion of the frame into upper and lower portions. That is, the interior space of the underframe has a multi-layered cross-sectional structure in which closed cross sections are stacked up and down both in front of and above the bent portions of the frame front portion and the frame kick - up portion, as well as the bent portions. Thus, by forming the inside of the underframe into a multi-layer cross-sectional structure, the strength of the underframe and the reinforcing member can be ensured, and the strength of the floor panel can be ensured.

According to the present disclosure, it is possible to secure the strength of the bent portion between the floor front portion and the floor kick-up portion while securing the space below the cab.

1 is a perspective view of a floor panel of a cab to which a floor panel reinforcing structure according to an embodiment of the invention is applied; FIG. It is the schematic which looked FIG. 1 from the II direction. It is a bottom view of a cab. It is a perspective view from the downward direction of an underframe and a reinforcement. FIG. 3 is an enlarged view of a portion V of FIG. 2; 6 is a sectional view taken along the line VI-VI of FIG. 5; FIG. FIG. 6 is a cross-sectional view taken along line VII-VII in FIG. 5; FIG. 5 is an explanatory diagram of when the floor panel of the cab is deformed;

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 positioned generally above an engine (not shown). The cab 2 has a floor panel 4 that defines the lower part of the passenger compartment 3 . The floor panel 4 integrally includes a front floor portion 4a, a floor kick-up portion 4b extending rearward and upward from the rear end of the floor front portion 4a, and a floor rear portion 4c extending rearward from the upper end of the floor kick-up portion 4b. have in The floor rear part 4c is located rearward and upward from the floor front part 4a, and the seat 5 on which the passenger sits is fixed on the upper side thereof.

As shown in FIGS. 1 to 7, the floor panel reinforcing structure for reinforcing the floor panel 4 includes a pair of left and right reinforcing structures arranged on both sides in the vehicle width direction and extending in the front-rear direction along the lower surface 6 of the floor panel 4. An underframe 10 and a pair of right and left reinforcements (reinforcing members) 11 arranged on both sides in the vehicle width direction and arranged in the underframe 10 are provided. In this embodiment, the left and right underframes 10 and the left and right reinforcements 11 are provided symmetrically on the left and right sides of the cab 2 and have substantially the same configuration. The force 11 will be explained, and the explanation on the right side will be omitted.

As shown in FIGS. 1 to 7, the left underframe 10 (hereinafter simply referred to as the "underframe 10") includes a frame front portion 10a extending in the longitudinal direction along the lower side surface 6a of the floor front portion 4a, It integrally has a frame kick-up portion 10b extending vertically along the lower side surface 6b (rear side surface) of the floor kick-up portion 4b and a frame rear portion 10c extending in the front-rear direction along the lower side surface 6c of the floor rear portion 4c. . The frame front portion 10a extends rearward from the front end portion of the floor panel 4 toward the outside in the vehicle width direction and is fixed to the floor front portion 4a. The frame kickup portion 10b extends rearward and upward continuously from the rear end of the frame front portion 10a and is fixed to the floor kickup portion 4b. The frame rear portion 10c extends rearward continuously from the upper end of the frame kick-up portion 10b to the rear end portion of the floor panel 4 and is fixed to the floor rear portion 4c. That is, the underframe 10 is fixed to the floor panel 4 and supports the floor panel 4 from below. A front end portion of the frame front portion 10a and a rear end portion of the frame rear portion 10c are supported from the vehicle body frame (not shown) side below.

The underframe 10 includes a pair of left and right frame vertical plate portions 12 intersecting the vehicle width direction, a frame bottom plate portion 13 connecting the lower ends of the left and right frame vertical plate portions 12, and the upper ends of the left and right frame vertical plate portions 12. and left and right flange portions 14 extending in directions away from each other, and formed in a hat-shaped cross section opening upward (see FIGS. 6 and 7), from the front end to the rear end of the floor panel 4. extends to That is, the left and right flange portions 14, the left and right frame vertical plate portions 12, and the frame bottom plate portion 13 continuously extend from the frame front portion 10a to the frame rear portion 10c via the frame kick-up portion 10b. The left and right flange portions 14 are spaced apart from each other in the left and right direction, and are joined and fixed to the lower side surface 6 of the floor panel 4 . The left and right frame vertical plate portions 12 are spaced apart from each other in the left and right direction, fixed to the lower surface 6 of the floor panel 4 via left and right flange portions 14, and extend downward. The frame bottom plate portion 13 is separated from the lower side surface 6 of the floor panel 4 . The underframe 10 defines an internal space 15 with left and right frame vertical plate portions 12 and a frame bottom plate portion 13 . The internal space 15 is a closed space whose top is blocked by the floor panel 4 . As shown in FIG. 5, the frame bottom plate portion 13 has a curved region 13a at the bent portion between the frame front portion 10a and the frame kick-up portion 10b. The curved region 13a of the frame bottom plate portion 13 is a partial region in the front-rear direction of the frame bottom plate portion 13, and is located at the bent portion between the frame front portion 10a and the frame kick-up portion 10b. It curves so as to bulge downward from the rear end side of 10a to the lower end side of frame kick-up portion 10b. The frame bottom plate portion 13 has a bead 16 continuously extending from the rear end portion of the frame front portion 10a to the front end portion of the frame rear portion 10c via the frame kick-up portion 10b. That is, in the present embodiment, the bead 16 extends from the front of the curved region 13a of the frame bottom plate portion 13 to the rear of the curved region 13a. The bead 16 is arranged at the center of the frame bottom plate portion 13 in the vehicle width direction, and extends in the front-rear direction while protruding upward (toward the interior space 15).

As shown in FIGS. 4 to 7, the left reinforcement 11 (hereinafter simply referred to as "reinforcement 11") is a reinforcing member fixed to the underframe 10 to reinforce the underframe 10. The underframe is formed to have a U-shaped cross section having a pair of left and right reinforcing vertical plate portions 17 crossing the direction and a reinforcing bottom plate portion (reinforcing horizontal plate portion) 18 connecting the lower ends of the left and right reinforcing vertical plate portions 17 to each other. 10 and extends in the longitudinal direction along the direction in which the underframe 10 extends. In this embodiment, the reinforcement 11 continuously extends from the front end side of the frame front portion 10a of the underframe 10 to substantially the center portion in the vertical direction of the frame kick-up portion 10b. That is, the reinforcement 11 is arranged in a region of the interior space 15 of the underframe 10 that includes the curved portion between the frame front portion 10a and the frame kick-up portion 10b. The left and right reinforcing vertical plate portions 17 are spaced apart from each other in the left and right direction, and are joined to the left and right frame vertical plate portions 12 of the underframe 10 in surface contact from the interior space 15 side. As shown in FIG. 5, of the reinforcing bottom plate portion 18, a region 18a facing the curved region 13a of the frame bottom plate portion 13 in a side view (hereinafter referred to as a "linear region 18a") can be seen from the frame front portion 10a side. It extends linearly rearward and upward toward the side of the frame kick-up portion 10b. The linear region 18a of the reinforcing bottom plate portion 18 is arranged in a chord shape with respect to the curved region 13a of the frame bottom plate portion 13 in a side view, and is spaced upward from the curved region 13a of the frame bottom plate portion 13 . A front region 18b of the reinforcing bottom plate portion 18 extending forward from the front end of the linear region 18a is in surface contact with the frame bottom plate portion 13 of the frame front portion 10a from above (see FIG. 6). A rear region 18c of the reinforcing bottom plate portion 18 extending upward from the rear end of the linear region 18a is spaced forward from the frame bottom plate portion 13 of the frame kick-up portion 10b. The linear region 18a and the rear region 18c of the reinforcing bottom plate portion 18 are separated from the frame bottom plate portion 13 and divide the internal space 15 of the underframe 10 into upper and lower portions. The reinforcing bottom plate portion 18 has a bead 19 that continuously extends from the front end of the linear region 18a to the rear end of the rear region 18c. The bead 19 is arranged in the vehicle width direction central portion of the reinforcing bottom plate portion 18 and extends in the front-rear direction while protruding upward.

Next, deformation of the floor panel 4 and the like (including the underframe 10 and the reinforcement 11) when the vehicle 1 collides and a forward load is input from the seating seat 5 side to the floor rear portion 4c of the floor panel 4. will be described with reference to FIG. 8 shows a state in which the floor panel 4 and the like are largely deformed for easy understanding.

As shown in FIG. 8, when a forward load is input to the floor rear portion 4c of the floor panel 4, the forward load is input to the upper end side of the frame kick-up portion 10b of the underframe 10, causing the underframe 10 to move. The bending portion between the frame front portion 10a and the frame kick-up portion 10b is further deformed in the bending direction. When the bent portion between the frame front portion 10a and the frame kick-up portion 10b of the underframe 10 is deformed, the frame bottom plate portion 13 of the frame kick-up portion 10b moves toward the rear end side of the linear region 18a of the reinforcing bottom plate portion 18 of the reinforcement 11. , the front end side of the linear region 18a of the reinforcing bottom plate portion 18 contacts the frame bottom plate portion 13 of the frame front portion 10a, and the linear region 18a of the reinforcement 11 contacts the frame bottom plate portion 13 of the frame front portion 10a and the frame kick The up portion 10b and the frame bottom plate portion 13 are stretched. As a result, deformation of the bent portion between the frame front portion 10a and the frame kick-up portion 10b of the underframe 10 is suppressed.

In the above configuration, the linear region 18a of the reinforcing bottom plate portion 18 of the reinforcement 11 extends linearly rearward and upward from the frame front portion 10a side toward the frame kick-up portion 10b side in a side view. It is arranged in a chord with respect to the curved region 13a. Therefore, when a forward load is input to the floor rear portion 4c of the floor panel 4 at the time of collision of the vehicle 1, the forward load is input to the upper end side of the frame kick-up portion 10b, and the frame front portion 10a and the frame kick-up portion 10b. When the bent portion with the frame kick-up portion 10b is about to deform, the linear region 18a of the reinforcing bottom plate portion 18 of the reinforcement 11 will move between the frame bottom plate portion 13 of the frame front portion 10a and the frame bottom plate portion 13 of the frame kick-up portion 10b. Therefore, deformation of the bent portion between the frame front portion 10a and the frame kick-up portion 10b can be suppressed. Thereby, the strength of the bent portion between the floor front portion 4a and the floor kick-up portion 4b of the floor panel 4 can be ensured.

Further, the reinforcement 11 is provided by left and right reinforcing vertical plate portions 17 fixed to the left and right frame vertical plate portions 12 of the underframe 10 and a reinforcing bottom plate portion 18 connecting the lower ends of the left and right reinforcing vertical plate portions 17 to each other. It is formed to have a U-shaped cross section and is arranged in a region of the internal space 15 of the underframe 10 that includes the bent portion between the frame front portion 10a and the frame kick-up portion 10b. Therefore, when the bent portion between the frame front portion 10a and the frame kick-up portion 10b is about to be deformed in the collision of the vehicle 1, the deformation of the reinforcing bottom plate portion 18 of the reinforcement 11 is suppressed by the left and right reinforcing vertical plate portions 17. Therefore, deformation of the bent portion between the frame front portion 10a and the frame kick-up portion 10b can be suppressed, thereby increasing the strength of the bent portion between the floor front portion 4a and the floor kick-up portion 4b of the floor panel 4. can be ensured.

Further, since the bead 16 extending from the front end side to the rear end side is formed in the curved region 13a of the frame bottom plate portion 13 of the underframe 10, the strength of the curved region 13a of the frame bottom plate portion 13 is ensured by the bead 16. can be done. Therefore, deformation of the curved region 13a of the frame bottom plate portion 13 of the underframe 10 can be suppressed when the bent portion between the frame front portion 10a and the frame kick-up portion 10b is about to be deformed in the collision of the vehicle 1. , deformation of the bent portion between the frame front portion 10a and the frame kick-up portion 10b can be suppressed, thereby securing the strength of the bent portion between the floor front portion 4a and the floor kick-up portion 4b of the floor panel 4. can be done.

Further, since the bead 19 extending from the front end side to the rear end side is formed in the linear region 18a of the reinforcing bottom plate portion 18 of the reinforcement 11, the strength of the linear region 18a of the reinforcing bottom plate portion 18 is secured by the bead 19. can do. Therefore, when the vehicle 1 collides, the bent portion between the frame front portion 10a and the frame kick-up portion 10b tends to be deformed, and the linear region 18a of the reinforcing bottom plate portion 18 of the reinforcement 11 becomes the frame bottom plate portion of the frame front portion 10a. 13 and the frame bottom plate portion 13 of the frame kick-up portion 10b, deformation of the linear region 18a of the reinforcing bottom plate portion 18 can be suppressed. Therefore, the strength of the bent portion between the floor front portion 4a and the floor kick-up portion 4b of the floor panel 4 can be secured.

Further, the linear region 18a and the rear region 18c of the reinforcing bottom plate portion 18 of the reinforcement 11 divide the internal space 15 of the underframe 10 into upper and lower portions. That is, the interior space 15 of the underframe 10 has a multi-layer cross-sectional structure in which the closed cross sections are stacked vertically on the curved portion between the frame front portion 10a and the frame kick-up portion 10b and the area behind (above) the curved portion. . Thus, by making the inside of the underframe 10 to have a multi-layer cross-sectional structure, the strength of the underframe 10 and the reinforcement 11 can be secured, and the strength of the floor panel 4 can be secured.

A reinforcement 11 for reinforcing the underframe 10 is arranged in the internal space 15 of the underframe 10 . In this way, since the underframe 10 is reinforced by the reinforcement 11 arranged in the internal space 15 of the underframe 10, there is no need to provide a reinforcing member below the underframe 10, and the space below the cab 2 (engine, etc.) space) can be secured.

In addition, since the beads 16 provided in the curved region 13a of the frame bottom plate portion 13 of the underframe 10 are formed in a state of protruding upward, the amount of downward protrusion of the underframe 10 differs from that of downward protrusion. can be suppressed, and a space below the cab 2 can be secured.

Therefore, according to this embodiment, it is possible to secure the strength of the bent portion between the floor front portion 4a and the floor kick-up portion 4b of the floor panel 4 while securing the space below the cab 2 .

In this embodiment, the front region 18b of the reinforcing bottom plate portion 18 of the reinforcement 11 is brought into surface contact with the frame bottom plate portion 13 of the frame front portion 10a of the underframe 10, but the present invention is not limited to this. For example, the front region 18b of the reinforcement bottom plate portion 18 of the reinforcement 11 is separated upward from the frame bottom plate portion 13 of the frame front portion 10a of the underframe 10, and the internal space 15 of the underframe 10 is formed on the front side of the reinforcement bottom plate portion 18. The area 18b may be divided vertically.

Further, in the present embodiment, the rear region 18c of the reinforcing bottom plate portion 18 of the reinforcement 11 is spaced forward from the frame bottom plate portion 13 of the frame kick-up portion 10b of the underframe 10, but this is not limitative. isn't it. For example, the rear region 18 c of the reinforcing bottom plate portion 18 of the reinforcement 11 may be brought into contact with the frame bottom plate portion 13 of the frame kick-up portion 10 b of the underframe 10 .

Further, in this embodiment, the front end of the linear region 18a of the reinforcing bottom plate portion 18 is brought into contact with the frame bottom plate portion 13 of the frame front portion 10a, and the rear end of the linear region 18a of the reinforcing bottom plate portion 18 is used as a frame kick. Although the up portion 10b is separated from the frame bottom plate portion 13, it is not limited to this. The front end of the linear region 18a of the reinforcing bottom plate portion 18 is separated from the frame bottom plate portion 13 of the frame front portion 10a, and the rear end of the linear region 18a of the reinforcing bottom plate portion 18 is connected to the frame bottom plate portion of the frame kick-up portion 10b. 13 may be contacted. Alternatively, both the front and rear ends of the linear region 18 a of the reinforcing bottom plate portion 18 may be brought into contact with the frame bottom plate portion 13 or separated from the frame bottom plate portion 13 .

Further, in the present embodiment, the beads 16 and 19 are provided in both the curved region 13a of the frame bottom plate portion 13 of the underframe 10 and the linear region 18a of the reinforcing bottom plate portion 18 of the reinforcement 11, but the present invention is not limited to this. bead 16 (or bead 19) may be provided in only one of the curved region 13a of the frame bottom plate portion 13 and the linear region 18a of the reinforcing bottom plate portion 18, or the frame bottom plate portion 13 The beads 16 and 19 need not be provided on both the curved region 13a of the reinforcing bottom plate portion 18 and the linear region 18a of the reinforcing bottom plate portion 18.

Further, in the present embodiment, the reinforcement 11 is formed into a U-shaped cross section that opens upward by the left and right reinforcing vertical plate portions 17 and the reinforcing bottom plate portion 18 that connects the lower ends of the left and right reinforcing vertical plate portions 17 to each other. However, the present invention is not limited to this, and it is sufficient that at least the left and right end sides have the reinforcing bottom plate portions 18 fixed to the left and right frame vertical plate portions 12 . For example, instead of the left and right reinforcing vertical plate portions 17, or in addition to the left and right reinforcing vertical plate portions 17, the reinforcement 11 extends downward from the left and right ends of the reinforcing bottom plate portion 18 to extend downward from the left and right frame vertical plate portions 12. It may have lower left and right reinforcing vertical plate portions fixed to the lower side.

Further, in the present embodiment, the reinforcement 11 extends continuously from the front end side of the frame front portion 10a of the underframe 10 to substantially the center portion in the vertical direction of the frame kick-up portion 10b, but is limited to this. Instead, it may be arranged in a region of the interior space 15 of the underframe 10 that includes the bent portion between the frame front portion 10a and the frame kick-up portion 10b. For example, the reinforcement 11 may extend from the front end side of the frame front portion 10a of the underframe 10 to the rear end side of the frame rear portion 10c, or may extend from the front-rear direction intermediate portion of the frame front portion 10a of the underframe 10. It may be extended continuously up to the intermediate portion in the vertical direction of the frame kick-up portion 10b.

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 reinforcing structures for floor panels of cabs of various vehicles.

1: Vehicle 2: Cab 4: Floor panel 4a: Front floor part 4b: Floor kick-up part 4c: Floor rear part 6: Bottom side of floor panel 10: Under frame 10a: Frame front part 10b: Frame kick-up part 11: Rain Force (reinforcement member)
12: Left and right frame vertical plate portions 13: Frame bottom plate portion 13a: Curved region of frame bottom plate portion 15: Internal space 16, 19: Bead 17: Left and right reinforcing vertical plate portions 18: Reinforcing bottom plate portion (reinforcing horizontal plate portion)
18a: linear region of reinforcing bottom plate portion 18b: front region of reinforcing bottom plate portion 18c: rear region of reinforcing bottom plate portion

Claims (4)

A cab that reinforces a floor panel having a front floor front portion, a rear floor rear portion positioned above the floor front portion, and a floor kick-up portion between the floor front portion and the floor rear portion. A floor panel reinforcement structure,
Left and right frame vertical plate portions fixed to the lower surface of the floor panel and extending downward, and a frame bottom plate portion connecting the lower ends of the left and right frame vertical plate portions to each other, along the lower surface of the floor panel. an underframe that extends in the front-rear direction to define an internal space between itself and the floor panel and supports the floor panel from below;
It is formed in a plate shape that intersects with the vertical direction, and has reinforcing horizontal plate portions that are fixed to the left and right frame vertical plate portions at both left and right end sides, and are arranged in the internal space of the underframe to extend the underframe. a reinforcing member that extends in the longitudinal direction along the installation direction and reinforces the underframe;
The underframe includes a frame front portion that extends in the front-rear direction along the lower side surface of the floor front portion, and a frame front portion that extends upward along the lower side surface of the floor kick-up portion continuously from a rear end side of the frame front portion. a frame kick-up portion and a bent portion between the frame front portion and the frame kick-up portion ;
The frame bottom plate portion includes a frame front rear region forming a rear portion of the frame front portion, a frame kick-up portion lower region forming a lower portion of the frame kick-up portion, and a rear frame front rear region. a curved region that curves between an end and a lower end of the frame kick-up portion lower region to form the bent portion;
The reinforcing member is disposed in the internal space of a region of the underframe including the rear portion of the frame front portion, the lower portion of the frame kick-up portion, and the bent portion ,
The reinforcing horizontal plate portion of the reinforcing member includes a front region facing the frame front rear region of the frame bottom plate portion from above, and a rear region facing the frame kick-up portion lower region of the frame bottom plate portion from above. and a linear region extending linearly rearward and upward from the rear end of the front region to the lower end of the rear region in side view and facing the curved region of the frame bottom plate portion from above ,
the lower portion of the floor kick-up portion, the lower area of the frame kick-up portion of the frame bottom plate portion, and the rear area of the reinforcing horizontal plate portion are arranged substantially in parallel and separated from each other;
The rear region and the linear region of the reinforcing horizontal plate portion vertically divide the internal space of the lower portion and the bent portion of the frame kick-up portion.
A cab floor panel reinforcing structure characterized by: The cab floor panel reinforcing structure according to claim 1,
A cab floor panel reinforcing structure, wherein the reinforcing member has left and right reinforcing vertical plate portions extending upward from both left and right ends of the reinforcing horizontal plate portion and fixed to the left and right frame vertical plate portions. The cab floor panel reinforcing structure according to claim 1 or 2,
At least one of the curved region of the frame bottom plate portion and the linear region of the reinforcing member is formed with a bead that protrudes upward and extends from the front end side to the rear end side of the one. Cab floor panel reinforcement structure. The cab floor panel reinforcement structure according to any one of claims 1 to 3 ,
The front region of the reinforcing horizontal plate portion is arranged at a position spaced apart from the frame bottom plate portion and from the floor panel to vertically divide the internal space of the frame front portion . The floor panel reinforcement structure of the cab.

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