JP2001039345A - Cab structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance safety by effectively reinforcing buckling strength of a floor panel including floor members, by arranging a collision energy receiving plate in the rear of a cab front structure, and supporting this receiving plate in rear parts of the respective floor members via beams extening in the longitudinal direction. SOLUTION: In a floor panel 3 of a cab such as a truck, a floor surface of a front part 3a including an installing part of a seat is formed low, a floor surface 3c of a rear part is formed high via a floor surface 3b of an inclining intermediate part, and floor members 1 for forming a closed cross-sectional skeleton are arranged so as to extend in the longitudinal direction along an under surface of this floor panel 3. In this case, beams 2a, 2b are arranged to extend so as to form an almost horizontal strut forward in the almost same height position as the rear floor surface 3c of the floor panel 3 from an intermediate part 1b extending while being vertically offset along the floor panel 3 of the respective floor members 1. The respective rear ends are joined to the intermediate part 1b of the floor members 1, and the front ends are joined to a collision energy receiving plate 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cab structure for a vehicle.

[0002]

2. Description of the Related Art Various measures have been taken to improve the safety of occupants in frontal collisions and the like even in large vehicles such as trucks (Japanese Utility Model Laid-Open No. 5-26747, Japanese Utility Model Laid-Open No. 6-13986, etc.). Of these, in the main sill (floor member) that enhances the buckling strength of the floor panel in the front-rear direction, the reinforcing member is disposed on the inner surface of the hat-shaped cross section, so that the buckling strength of the portion from the front end portion to the seat mounting portion is provided. Is positively increased as compared to the rear portion of the motor (Japanese Patent Laid-Open No. 9-24051).
No. 5). In this case, at the time of a frontal collision, buckling concentrates on a portion behind the seat mounting portion to effectively absorb the collision energy, while the front portion including the seat mounting portion is deformed forward due to an increase in buckling strength. As a result, a space can be secured between the seat and a structure in front of the cab (such as an instrument panel or a steering wheel).

[0003]

The main sill is formed so as to extend along the lower surface of the floor panel from the front end portion to the rear portion while being vertically offset. For this reason,
Compared to the case of extending straight, the transmission efficiency of the force tends to decrease due to the offset, and the reinforcement does not effectively reflect the improvement of the buckling strength. The substantial thickness of the main sill is increased by the thickness of the reinforcing member, which leads to an increase in buckling strength.However, such reinforcement by the thickness has a limit from the viewpoint of productivity. The above buckling strength cannot be obtained.

The present invention has been made in view of such a problem, and has an object to provide an effective reinforcing means for a floor member extending while being vertically offset in the front-rear direction along the lower surface of the floor panel. Aim.

[0005]

According to a first aspect of the present invention, as means for reinforcing the buckling strength of the floor panel in the front-rear direction, a plurality of extending from the lower front portion to the higher rear portion along the lower surface of the floor panel. In a cab structure having a floor member, a collision energy receiving plate is arranged behind a cab front structure, and the receiving plate is provided with a beam extending straight in the front-rear direction at an intermediate portion rising to the rear or rear of each floor member. To support through.

According to a second aspect of the present invention, a cab structure including a plurality of floor members extending from a lower front portion to a higher rear portion along the lower surface of the floor panel as means for reinforcing the buckling strength of the floor panel in the front-rear direction. , The rear ends of the beams extending straight in the front-rear direction are respectively connected to the rear portions or the intermediate portions rising to the rear portions of the floor members, and the front ends of these beams are connected to the front panel of the cab via a collision energy absorbing member. .

According to a third aspect of the present invention, in the first or second aspect, a beam connecting these in the vehicle width direction is added to a plurality of beams extending in the front-rear direction.

In a fourth aspect, a plurality of floor members extending from a lower front portion to a higher rear portion along a lower surface of the floor panel as means for reinforcing the buckling strength of the floor panel in the front-rear direction; And a tunnel portion extending from the lower front portion toward the higher rear portion as a part of the cab structure, wherein a reinforcing member having a U-shaped cross section or a hat-shaped cross section forms a closed-frame skeleton extending in the front-rear direction. I do.

[0009]

According to the first aspect of the invention, when collision energy is input to the receiving plate via the cab front structure at the time of a head-on collision, each beam extending straight in the front-rear direction is transmitted to the floor member. The rear of the floor member
The additional input through the beam is more likely to buckle than the front and middle portions reinforced by the beam. As a result, when the buckling occurs at the rear of the floor member, the cab is crushed in the front-rear direction by that much, but the space in front of the seat (the distance between the seat and the front structure of the cab) is increased by the strut through the beam receiving plate. Secured by Since the collision energy at the front of the vehicle is distributed to the floor members and the beams, the buckling strength in the space in front of the seat can be efficiently improved.

In the second invention, the input to each beam is attenuated through the impact energy absorbing member at the time of a head-on collision, so that in addition to the same operation and effect as the first invention, the transmission of the shock to the seat is also achieved. It can be effectively reduced.

In the third aspect, the buckling strength of the beams extending in the front-rear direction is also reinforced by the beams connecting the beams in the vehicle width direction, so that higher safety against a frontal collision can be ensured.

In the fourth aspect, since the skeleton extending in the front-rear direction is formed, the buckling strength of the tunnel portion and thus the buckling strength of the floor panel including the floor member extending while offset vertically in the front-rear direction are effectively reinforced. it can.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a first embodiment. A cab floor panel 3 has a front portion 3a including a mounting portion of a seat 4 having a low floor surface and an inclined middle portion. Floor 3c (becomes a bed behind the seat) via the floor 3b
Is formed high. A floor member 1 extending in the front-rear direction along the lower surface of the floor panel 3 is provided. The floor member 1 forms a skeleton of a closed cross section on the lower surface of the floor panel 3, and is arranged symmetrically through the center line thereof.

A substantially horizontal strut is formed forward from the intermediate portion 1b of each floor member 1 (extending while being vertically offset along the floor panel 3) at the same height as the rear floor surface 3c of the floor panel 1. Extending beam 2
a, 2b (vertical beam members) are provided, respectively. Beam 2
The rear ends of the members a and 2b are connected to the intermediate portion 1b of the floor member 3, and the receiving plates 5 for collision energy are formed at the front ends extending forward. The receiving plate 5 is disposed so as to face the cab front structure (the front panel and its attached structure, etc.), and is attached between the pair of beams 2a and 2b so as to connect them.

With such a configuration, when collision energy is input to the receiving plate 5 via the cab front structure at the time of a head-on collision, the beams 2 a and 2 b extending substantially horizontally and straight transmit the input to the floor member 1. Since the rear portion 1c of the floor member 1 also receives an input via the beams 2a and 2b, the rear portion 1c is more likely to buckle than the front portion 1a and the intermediate portion 1b reinforced by the beams 2a and 2b. As a result, when buckling occurs at the rear portion 1c of the floor member 1, the cab is crushed in the front-rear direction by that much, but the space in front of the seat 4 (the distance between the seat 4 and the cab front structure) is reduced by the beam 2
a, 2b is secured by a tension through the receiving surface 5. Since the collision energy on the front of the vehicle is distributed to the floor member 1 and the beams 2a and 2b, the buckling strength in the space in front of the seat 4 can be efficiently improved.

FIGS. 3 to 7 show a second embodiment. In order to further reinforce a pair of beams 2a and 2b extending in the front-rear direction, two beams connecting the pair in the vehicle width direction are provided. Beams 6a and 6b (cross beams) are added. One cross beam 6a is arranged at an intermediate position between the vertical beams 2a and 2b, and the other cross beam 6b is arranged at the rear end of the vertical beams 2a and 2b. The pair of vertical beams 2a, 2b is connected to the intermediate portion 1b of each floor member 1 via the horizontal beam 6b at the rear end position.
Linked to In this case, a region sandwiched between the pair of floor members 1 is formed in the tunnel panel 7 protruding toward the passenger compartment in the floor panel 3, and the vertical and horizontal beams 2a, 2b, 6a, 6
The structure composed of b and the receiving plate 5 is housed inside the tunnel portion 7 (in a concave portion opened on the lower surface of the panel 3). Note that a plurality of cross beams 6a may be arranged at appropriate intervals.

According to this, the buckling strength of the beams 2a and 2b is also reinforced by the beams 6a and 6b, so that higher safety against a head-on collision can be secured.
Further, when the structures such as the beams 2a, 2b, 6a, 6b are hidden inside the tunnel portion 7, the appearance in the vehicle compartment is not spoiled. When the front half of the tunnel portion 7 is formed lower than the rear half of the floor panel 3 at substantially the same height as the rear portion 3c, the structures such as the beams 2a, 2b, 6a, and 6b move forward as shown in FIG. You may make it attach with the angle (alpha) which inclines downward. In the case where the first half of the tunnel portion 7 is similarly formed narrower than the second half, FIG.
The vertical beam members 2a, 2b extending from the horizontal beam member 6b to the receiving surface portion 5 so that the interval between the beams 2a, 2b decreases forward as shown in FIG.
May be set to the angle β. 3 to 7, parts that are the same as those shown in FIGS. 1 and 2 are given the same reference numerals, and redundant description is omitted. The beams 6a may be arranged in plural at appropriate intervals.

FIGS. 8 and 9 show a third embodiment, in which beams 2a and 2b extending in the front-rear direction and a beam 6a connecting these at an intermediate position are provided. On the lower surface of the floor panel 3, in addition to the floor member 1, a cross member 10 for connecting these rear portions to each other is attached. The floor member 1 forms a closed-section skeleton on the floor panel 3, while the cross member 10 forms a closed-section skeleton on a bent portion (corner portion) extending from the intermediate portion 3 b to the rear portion 3 c of the floor panel 3. .

The beams 2a and 2b have their rear ends connected to the floor member 1 via the cross member 10, while their front ends are connected to the box member 8 of the front panel 11 as energy absorbing members. The front panel 11 includes a plurality of cross members 9 forming a skeleton of a closed cross section in the vehicle width direction, and the box members 8 form a skeleton of a closed cross section connecting the cross members 9. In the floor panel 3, a portion between the pair of floor members 1 is formed in the tunnel portion 7, and the beams 2 a, 2 b, 6 a are stored inside the tunnel portion 7.

According to this, since the box member 8 of the front panel 3 is used as an energy absorbing member,
In addition to the functions and effects of the first embodiment, the impact received by the beams 2a and 2b at the time of a head-on collision can be effectively attenuated. That is, the transmission of shock to the seat mounting portion located in the front space secured by the beams 2a, 2b, 6a is also reduced. The tunnel 7 has a floor panel 3 in the first half.
The beam 2a, 2b is attached so as to be inclined downward from the cross member 10 to the front panel 11 (see FIG. 6).
reference). 8 and 9, the same components as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and the description thereof will not be repeated.

FIGS. 10 to 12 show a fourth embodiment in which the tunnel portion 7 formed on the floor panel 3 is actively used in order to increase the buckling strength of the floor panel 3 in the front-rear direction. is there. Tunnel part 7 of floor panel 3
Are provided on both sides of the floor member 1 forming a closed-section skeleton extending in the front-rear direction from the front part 3a of the low floor to the rear part 3c of the high floor along the lower surface of the panel. Inside the tunnel portion 7, a reinforcing member 12 forming a skeleton of a closed cross section extending in the front-rear direction at a bent portion (corner portion) extending from the side wall 7a to the ceiling 7b is attached. The reinforcing member 12 is formed to have a substantially U-shaped cross section, and is welded to both sides (side wall surface and ceiling surface) of the tunnel portion 7 with the bent portion therebetween via a flange.

With such a structure, a skeleton extending in the front-rear direction is formed at the corner of the tunnel portion 7, so that the buckling strength of the tunnel portion 7 and thus the floor including the floor member 1 extending vertically offset in the front-rear direction. Panel 3
Buckling strength can be effectively reinforced. The reinforcing member 12 may form two sides of a closed cross section by using the corner portion of the tunnel portion 7, and the material cost can be reduced. In addition, as shown in FIG. 12, not only the corner portion of the tunnel portion 7 but also a reinforcing member 12a having a hat-shaped cross section may be added as necessary, and the frame may be hung on the ceiling 7b or the side wall 7a to form a plurality of skeletons. . In that case, these reinforcing members 12, 12a
By integrally molding a single steel plate by pressing, it is easy to assemble (welding, etc.) to the tunnel portion 7. When a sound absorbing material or the like is housed in a closed section skeleton formed by the reinforcing members 12, 12a, a significant reduction in engine noise and vibration can be obtained.

In the first and second embodiments, when an impact energy absorbing member is disposed on the front surface of the receiving plate 5, the same operation and effect as those of the third embodiment (reduction of impact to the seat) can be achieved. Can be secured).

[Brief description of the drawings]

FIG. 1 is a perspective view of a floor panel representing a first embodiment.

FIG. 2 is a side view of the cab.

FIG. 3 is a perspective view of a floor panel showing a second embodiment.

FIG. 4 is a side view of the floor panel.

FIG. 5 is a sectional view taken along line AA of FIG.

FIG. 6 is a side view of a floor panel showing a modification.

FIG. 7 is a bottom view of a floor panel showing a modification.

FIG. 8 is a perspective view of a floor panel showing a third embodiment.

FIG. 9 is a side view of the same.

FIG. 10 is a perspective view of a floor panel showing a fourth embodiment.

FIG. 11 is a sectional view taken along line BB of FIG.

FIG. 12 is a sectional view showing a modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor member 2a, 2b, 6a, 6b Beam 3 Floor panel 4 Seat 5 Receiving plate 7 Tunnel part 8 Energy absorption member (front box member) 10 Floor cross member 11 Front panel 12, 12a Reinforcement member

Claims (4)

[Claims] 1. A cab structure comprising a plurality of floor members extending from a lower front portion to a higher rear portion along a lower surface of a floor panel as means for reinforcing the buckling strength of the floor panel in the front-rear direction. A cab having a collision energy receiving plate disposed behind the structure and supported by a beam extending straight in the front-rear direction at a rear portion or an intermediate portion rising to the rear portion of each floor member. Construction. 2. A cab structure comprising a plurality of floor members extending from a lower front portion to a higher rear portion along a lower surface of the floor panel as means for reinforcing buckling strength of the floor panel in the front-rear direction. The rear end of the beam extending straight in the front-rear direction is connected to the rear portion or the intermediate portion rising to the rear portion, and the front ends of these beams are connected to the front panel of the cab via a collision energy absorbing member. Cab structure to do. 3. The cab structure according to claim 1, wherein a beam for connecting the plurality of beams extending in the front-rear direction in a vehicle width direction is added. 4. A plurality of floor members extending from a lower front portion to a higher rear portion along a lower surface of the floor panel as means for reinforcing the buckling strength of the floor panel in the front-rear direction.
A cab structure, comprising a tunnel portion that rises from a lower front portion and extends toward a higher rear portion as a part of the floor panel. A cab structure characterized by being formed.