JP3179882B2 - Lower body structure of car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower body structure of a cab-over type automobile, and more particularly to an improvement in a structure for joining a frame to a floor panel.

[0002]

2. Description of the Related Art In general, in a one-box type automobile having no engine room in front of a passenger compartment, a cab-over type in which an engine is mounted below a floor panel is used (actually, a cab-over type). Kaisho 56-4
No. 8961).

[0003] Further, as such a lower body structure of an automobile, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 4-16085, an opening which opens upward at the lower surface side end of a floor panel is provided. A frame having inner and outer flanges at inner and outer positions of the vehicle body at the opening edge is joined via the inner and outer flanges, and the floor panel and the frame have a closed cross section extending in the front-rear direction at the vehicle body side end. is there. The inner and outer flanges of the frame are bent inward and outward with respect to the inner and outer surfaces of the frame, that is, the inner flange of the frame is bent inward with respect to the inner surface of the frame, while the inner and outer flanges of the frame are bent inward. An outer flange is bent outward with respect to the outer surface of the frame, and is formed in a frame having a substantially hat-shaped cross section.

[0004]

When the engine is disposed between the left and right frames, the frames are bent inward and outward with respect to the lower surface of the floor panel as described above. The joint-fixed one has a drawback that the joint-fixing part between the inner flange and the floor panel protrudes toward the engine (inside the vehicle body), so that the storage volume of the engine is small. .

[0005] The present invention has been made in view of such a point, and an object of the present invention is to effectively arrange the above-mentioned inner flange so that the accommodation capacity of the engine can be increased.

[0006]

Means for Solving the Problems In order to achieve the above object, a solution taken by the invention according to claim 1 is an automobile in which an engine is mounted below a floor panel as a lower body structure of the automobile. Is assumed. Then, a frame having an opening that opens upward at the lower surface side end of the floor panel and having inner and outer flanges at positions inside and outside the vehicle body at the opening edge is joined via the inner and outer flanges, and the floor is joined to the floor panel. The panel and the frame form a closed section extending in the front-rear direction at the vehicle body side end. In addition, the above-mentioned error
The engine shall be located between the two frames.
You. And positioned on the side of the engine on the frame
The inner side of the flange at the site of, is obtained by a configuration in which it extends upwardly.

Further, a solution taken by the invention of claim 2 limits the frame of the invention of claim 1 to correspond to a front portion, a side portion and a rear portion of the engine. Then, an inner flange corresponding to the side portion of the engine is provided extending upward, and the inner flange corresponding to the front portion and the rear portion of the engine is bent inward of the vehicle with respect to the inner side surface of the frame. . On the other hand, the outer flange is bent outward of the vehicle body with respect to the outer surface of the frame.

[0008] Further, a solution taken by the invention according to claim 3 is to limit the floor panel according to the invention described in claim 1 or 2, wherein a seat portion on which a seat is installed on the floor panel is replaced by the seat portion. It is provided so as to protrude in a step-like manner with respect to the floor panel except for. A gusset is provided between the seat and the inner and outer flanges of the frame to connect the seat to the inner and outer flanges of the frame.

[0009]

According to the above-mentioned structure, according to the first aspect of the present invention,
Since the inner flange at a portion of the frame located on the side of the engine is provided extending upward, the joint fixing portion between the inner flange and the floor panel is provided even when the engine is disposed between the frames. , Does not protrude toward the engine.

According to the second aspect of the present invention, since the outer flange is bent outwardly of the vehicle body, the rigidity of the frame against a side collision is increased.

Further, an inner flange corresponding to a side portion of the engine is provided extending upward, and
Since the inner flanges corresponding to the front and rear portions of the engine are bent inward of the vehicle body, the frame is divided into the front and rear portions of the engine and the side portions of the engine having different cross-sectional shapes. Is possible,
The weight of the frame itself is reduced by reducing the thickness of the frames at the front part and the rear part of the engine in order to exhibit the shock absorbing effect at the time of a frontal collision or a rear-end collision.

Further, according to the third aspect of the present invention, the space bulging in a stepped manner between the seat portion of the floor panel and the floor panel excluding the seat portion is formed between the seat portion and the inner and outer flanges of the frame. Since the frame is supported by the gussets connecting the spaces, the supporting rigidity of the seat portion with respect to the floor panel is increased.

Further, the outer portion of the seat portion is reinforced by the gussets on the frame, and the rigidity of the seat portion against a side collision is effectively increased.

[0014]

As above, according to the present invention, according to the vehicle bottom structure of the invention described in claim 1, since there is provided to extend the inner side of the flange of the frame upward, joined and fixed to the inner flange and the floor panel It is possible to increase the accommodation volume of the engine without projecting the portion toward the engine.

According to the vehicle body lower part structure of the present invention, the outer flange is bent outward and the inner flanges corresponding to the front and rear parts of the engine are bent inward. Let me sing,
Since the inner flange corresponding to the side of the engine has been extended upward, the rigidity of the frame against side collisions can be increased, and the front and rear parts of the engine and the side parts of the engine have a cross-sectional shape. , The weight of the frame itself can be reduced while exhibiting a shock absorbing effect at the time of a head-on collision or a rear-end collision.

Further, according to the lower body structure of the automobile according to the third aspect of the present invention, the gusset connecting between the outer portion of the seat portion and the inner and outer flanges of the frame allows the gusset to connect the seat portion and the floor panel. This space can be supported by the frame, so that the supporting rigidity of the seat portion with respect to the floor panel can be increased, and the rigidity of the seat portion with respect to the side collision can be effectively increased.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 8 show a lower part of an automobile using a lower body structure according to an embodiment of the present invention.
A cab-over type one-box car in which a frame structure having frames 2 and 2 extending in the front-rear direction at a lower end portion side end position of a vehicle body is adopted, and an engine 4 is mounted below a vehicle cabin 3. Has been applied.
The engine 4 is a V-type six-cylinder engine having a drive shaft (not shown) extending in the front-rear direction of the vehicle body and having left and right banks 4a and 4b inclined left and right. At the center in the vehicle width direction in the vehicle interior 3, a tunnel 6 protruding upward from a substantially flat floor panel 5 constituting a floor surface of the vehicle interior 3 is located at a front end position in the vehicle interior 3. It is provided extending further back,
The rigidity of the vehicle body is increased. The front end portion of the tunnel section 6 in the passenger compartment 3 is a floor panel 5.
, And is formed integrally, and the remaining rear portion is formed by a tunnel member 7 having a substantially U-shaped cross section. The upper surface of the tunnel material 7 (the rear portion of the tunnel portion 6) is inclined obliquely upward so as to become higher as going backward.

The floor panel 5 is composed of a front floor panel 11 constituting a foot floor of a front occupant sitting on a front seat 13 described later, and a rear floor panel 12 constituting a foot floor of a rear occupant. This front
On the left and right sides between the lower panel 11 and the rear floor panel 12 between the two panels, that is, below a front seat 13 to be described later, first service holes 8, 8 for providing service of the engine 4 are provided. ing. Each of the first service halls 8 has a front seat 1
3 is covered from above by a seat panel 14 (seat portion) for installing the 3 (seat), and is joined and fixed to the periphery of each first service hole 8, that is, to the floor panel 5. And the said sheet panel 14
The floor panel 5 (the front floor panel 11 and the rear floor panel 12) is provided so as to protrude upward in a stepped manner. The front seat 13 is
The lower surface of the seat cushion 13a is composed of a seat cushion 13a and a seat back 13b, and the lower surface of the seat cushion 13a has a pair of left and right substantially C-shaped cross-sections with respect to the upper surface of the seat panel 14.
The front seat 13 allows the front seat 13 to slide in the vehicle longitudinal direction.

As shown in FIG. 7, a front upper surface of a front lower frame 15 having a substantially V-shaped cross section is fixedly joined to the front lower surface of the front floor panel 11. Is joined to the lower surface of the front end of the front floor panel 11 via a dash lower panel 19, which will be described later. further,
At the side of the front floor panel 11, there is provided a step portion 16 for facilitating getting on and off the front seat occupant. The step portion 16 has a step panel 17 having a substantially L-shaped cross-section and an upper end joined and fixed to the lower surface of the side end of the front floor panel 11 and an upper end joined to the outer end of the step panel 17. Side sill portion 18a. The front portion of the step panel 17 has an inner surface joined and fixed to the rear outer end of the front lower frame 15 and extends forward.
Is bonded and fixed to the front rear surface of the front panel.

The side sill portion 18a is joined and fixed to the outer end of the front lower frame 15 from the front end thereof and extends upward along the front lower frame 15;
A center pillar 18c extending upward from the rear end position is integrally formed. At the lower end position of the inner end of the center pillar portion 18c, a first gusset 20 having an inner end portion having a holding portion 20a for holding the frame 2 from below and outside with respect to the frame 2 is provided. The inner end surface is bonded and fixed, and the support rigidity of the lower end of the center pillar portion 18c is effectively increased by bonding and fixing to the frame 2 by the holding portion 20a via the first gusset 20. I have. At the front end of the front floor panel 11, a dash lower panel 19 that partitions an auxiliary device accommodating space H for accommodating auxiliary devices such as a battery B and a blower A of an air conditioner and a vehicle compartment 3 at a lower position.
The outer end of the dash lower panel 19 is joined and fixed to the inner surface of the front end of the cowl side portion 18b.

The seat panel 14 has a central portion in the vehicle width direction bulging further upward to form the tunnel portion 6.
Is provided to extend rearward. The extension tunnel portion 21 is formed of an extension tunnel material 29 and is formed in a stepped shape with respect to the upper surface of the seat panel 14 in a front view of the vehicle body, and is substantially horizontally lower than the uppermost portion 21 a of the extension tunnel portion 21. Step 21
b prevents the engine 4 from interfering with the banks 4a and 4b. The seat panel 14
Is opened with an edge on its upper surface, and the engine 4
And a second service hole 22 for performing the above-mentioned service from the upper surface side of the seat panel 14, and a lower end thereof is fixedly joined to a rear portion of the front floor panel 11 and a rear end of the tunnel member 7 so as to stand substantially at a right angle, and 14 having a substantially L-shaped cross section, having a top edge at the top and a front edge 23a constituting the front edge of the extension tunnel portion 21 at its upper end.
3 and a lower end thereof are joined and fixed to a rear portion of the inner end of the step panel 17 and a rear portion of an upper edge of the side sill portion 18a so as to stand substantially at a right angle along the center pillar portion 18c. Constituting side edge 24a
Side panel member 24 having a substantially L-shaped cross section at the upper end, and a rear edge of an upper surface of the sheet panel 14 having a front end joined and fixed to a rear end of the extended tunnel portion 21 and an inner end rear of the side panel member 24, respectively. A rear panel member 25 having a rear edge portion 25a at the front end portion and inclined obliquely downward so as to become lower toward the rear, and a rear panel member corresponding to the rear of the uppermost portion 21a of the extension tunnel portion 21 25 and the top 2 of the extension tunnel 21
A second gusset 27 having a substantially U-shaped cross section for closing the opening 26 so that the rear panel member 25 protrudes rearward to the rear end of the rear panel member 25, and a rotating hinge 71 to be described later is attached to a rear edge 25 a of the rear panel member 25. , And is rotatably supported through the upper surface of the sheet panel 14 (the step portion 21b of the extension tunnel portion 21, the front edge 23a of the vertical panel material 23, the side edge 24a of the side panel material 24, and the rear panel). A sheet panel material 33 (seat panel) that covers the second service hole 22 with the peripheral edge thereof abutting against the rear edge 25a) of the material 25 from above. The sheet panel member 33 is sealed with respect to the upper edge of the sheet panel 14 by a sealing member 9 made of hollow rubber provided over the entire periphery of the sheet panel member 33. The rear panel material 25
The rear end is joined and fixed to the front end of the rear floor panel 12. Further, a cross member 28 having a substantially U-shaped cross section extending in the vehicle width direction is joined and fixed to the lower surface of the front end portion of the rear floor panel 12, and is joined and fixed to the frames 2, 2. Between them, a closed cross section extending in the vehicle width direction is formed.

A steering member 42 having a substantially circular cross section for supporting a steering shaft 41 extending substantially in the front-rear direction of the vehicle body is provided in front of the seat panel 14 in the vehicle interior 3. The steering member 42 is arranged so as to extend in the vehicle width direction, and each end thereof is joined and fixed to the cowl side portion 18b. Further, upper ends of steering stays 43, 43 for supporting a substantially intermediate portion of the steering member 42 below, are fixedly connected to the steering member 42. Each of the steering stays 43 has a shape in which the front-rear width is increased as approaching the lower end so that the lower end thereof is joined and fixed to the vertical panel member 23 on the front side of the left and right seat panels 14 and the front floor panel 11. It is formed and fixed to the vertical panel member 23 and the front floor panel 11 via the flange 43a bent at a substantially right angle in accordance with the vertical panel member 23 and the front floor panel 11 at the lower end. It has become. Further, the lower end of each of the steering stays 43 is arranged along the side wall surface of the tunnel portion 6 (tunnel material 7), and the lower surface is joined and fixed to the upper surface of the tunnel portion 6 and the side surface protrudes upward. The bracket 45 is fastened and fixed to the side surface of the bracket 45 having a substantially U-shaped cross section.

As a characteristic part of the present invention, as shown in FIGS. 1 to 5, the frames 2 and 2 are provided with a central frame portion 51 joined to the lower surface of the floor panel 5.
(Frame), a front frame portion 52 having a rear end portion joined and fixed to a front end portion of the central frame portion 51, and a rear frame portion 53 having a front end portion joined and fixed to a rear end portion of the central frame portion 51. And is divided into three. The front frame portion 52 and the rear frame portion 53 are formed thinner than the center frame portion 51 so as to effectively absorb the collision energy at the time of a frontal collision or a rear-end collision. The central frame portion 51 is formed in a substantially U-shaped cross section having an opening that opens upward, and has inner and outer flanges 54 and 55 at positions inside and outside the vehicle body at inner and outer edges of the opening. Inner and outer flanges 54,5
A central frame portion 51 is joined and fixed to the lower surface of the floor panel 5 via a central portion 5, and a closed section extending in the front-rear direction at the vehicle body side end is formed by the floor panel 5 and the frames 2 and 2. Further, the central frame portion 51 includes a side portion 56 located on the side of the engine 4, a front portion 57 corresponding to the front of the engine 4, and a rear portion 58 corresponding to the rear of the engine 4. The side portion 56 is arranged so as to expand toward the outside of the vehicle body so as to avoid interference with the engine 4. The inner flange 54 corresponding to the side portion 56 is provided so as to extend upward so as to coincide with the inner surface 59 of the side portion 56, while the inner flange 54 of the front portion 57 and the rear portion 58 is provided. 54 is the front part 5
7 and the inside surface 59 of the rear portion 58 is bent inward of the vehicle body. On the other hand, the outer flange 55 of the central frame portion 51 (the side portion 56, the front portion 57, and the rear portion 58) is bent outward of the vehicle body with respect to the outer surface 60 of the central frame portion 51. The central frame portion 51 corresponding to the first service hole 8 is opened upward, is closed by a panel material 61 having a substantially L-shaped cross section, and forms a closed cross section. The frame portion 52 and the rear frame portion 53 include a first member 62 having a substantially hat-shaped cross section located on the vehicle body inner side, and a panel-shaped second member 6 for closing an opening of the first member 62 from the vehicle body outer side.
3 form a closed section.

A part of the rear end of the front floor panel 11 corresponding to the front side of the side portion 56 of the central frame portion 51 (the portion outside the extended tunnel portion 21) is connected to the vertical panel material 23. The front and rear flanges 54 and 55 of the central frame portion 51 extend through a part of the rear end of the front floor panel 11 and the front edge 23 a of the vertical panel member 23. A third gusset 31 having a substantially U-shaped cross section and having a substantially trapezoidal shape when viewed from the side of the vehicle body, which is joined and fixed between the two, is joined and fixed to the lower surface,
The front surface of the third gusset 31 is also joined and fixed to the rear surface of the vertical panel member 23. Also, as shown in FIG.
Inner and outer flanges 54 and 55 corresponding to the rear side of the side portion 56 of the central frame portion 51, and the rear panel member 25 corresponding to the upper portion of the rear side of the side portion 56 of the central frame portion 51.
A fourth gusset 32 having a substantially U-shaped cross section and having a substantially trapezoidal shape when viewed from the side of the vehicle body is provided between the second gusset 32 and the rear gusset 32a. The rear surface is also bonded and fixed to the lower surface of the rear panel member 25. Further, between the rear end portion of the seat panel member 33 and the front end portion of the rear floor panel 12, a rotating hinge 71 for supporting the seat panel member 33 so as to be freely open rearward with respect to the rear floor panel 12 is provided. ing. The rotating hinge 71 has inner and outer pieces 72a, 72b extending forward and downward along the outer surface of the rear panel material 25 at the inner and outer positions of the sheet panel material 33, respectively.
b is fastened and fixed to the rear end of each of the seat sliders 10 by bolts 73, 73, while the base ends (rear ends) of the inner and outer pieces 72a, 72b are integrally connected. A rear panel member 25 having a vertical surface 75a standing upright along the rear surface of the rear panel member 25 and extending rearward along the rear floor panel 12 with bolts 73 attached to the rear floor panel 12. , 73, the rear floor panel side member 7 having a substantially L-shaped cross section
The support shaft 71a of the rotary hinge 71 is provided at a corner of the upper rear end of the fourth gusset 32 corresponding to the upper end of the rear surface of the rear panel member 25 to reinforce the rotary hinge 71. Is effectively performed by the fourth gusset 32.

Therefore, in the above embodiment, the inner flange 54 of the central frame portion 51 is provided so as to extend upward so as to substantially coincide with the inner surface 59 thereof. Even if the engine 4 is disposed between the central frame portions 51, 51, the joint fixing portion does not protrude toward the engine 4 (inward of the vehicle body), so that the accommodation capacity of the engine 4 can be increased.

Further, since the outer flange 55 of the central frame portion 51 is bent outward with respect to the outer surface 60 of the central frame portion 51, the rigidity of the central frame portion 51 against side collision can be increased. Moreover, the front part 5 of the central frame 51 corresponding to the front and rear of the engine 4
7 and the inner flange 54 of the rear portion 58 are bent inward of the vehicle body with respect to the inner surface 59 of the front portion 57 and the rear portion 58, so that the front portion 57 and the rear portion 58 having different cross-sectional shapes. And the side frame 56, the front frame 52 and the rear frame are formed to be thin in order to exhibit a shock absorbing effect at the time of a frontal collision or a rear-end collision. 53
Accordingly, the weight of the frame 2 itself can be reduced.

Further, the front edge 23a of the vertical panel material 23
The inner and outer flanges 5 on the front side of the central frame portion 51 through a part of the rear end of the front floor panel 11 on the frame 2
The floor panel is formed by a third gusset 31 that supports the rear panel material 25 and the fourth gusset 32 that supports the rear edge 25a of the rear panel member 25 to the inner and outer flanges 54 and 55 on the rear side of the central frame portion 51. The space between the seat panel 5 and the seat panel 14 bulging in a stepped manner with respect to the floor panel 5 is supported at the front and rear, and the supporting rigidity of the seat panel 14 with respect to the floor panel 5 can be increased. Moreover,
The outer portions of the seat panel 14 are reinforced by the front and rear gussets 31 and 32 on the central frame portion 51, and the rigidity of the seat panel 14 against side collision can be more effectively increased.

It should be noted that the present invention is not limited to the above-described embodiment, but includes various other modifications.
For example, in the above-described embodiment, the third gusset 31 and the fourth gusset 32 support the seat panel 14 bulging in a step-like manner with respect to the floor panel 5 in the front-rear direction. The configuration may be such that the sheet panel is supported at the rear by only the gusset.

In the above embodiment, the seat panel 14
The second service hole 22 is provided on the upper surface of the vehicle, and the service hole 22 is covered with the seat panel material 33. However, a rotating hinge is provided between the seat panel and the rear floor panel, and the seat panel is opened and closed by the rotating hinge. Thus, the first service hole may be configured to be covered.

Further, in the above embodiment, the central frame portion 51 is integrally formed by the side portion 56, the front portion 57, and the rear portion 58 having different cross-sectional shapes, but the side portion, the front portion, and the rear portion are respectively formed. It may be formed separately, in which case, at the time of a head-on collision (at the time of a rear-end collision)
The thickness may be changed in consideration of the absorption of the load. Also,
In the above embodiment, the inner flange 54 of the side portion 56 of the central frame portion 51 extends upward and the outer flange 55
Is bent outward, but the inner and outer flanges at the side portions of the central frame portion may both be extended upward.

[Brief description of the drawings]

FIG. 1 is a side view of a front part of a vehicle compartment in a partially cut-away state.

FIG. 2 is a cross-sectional view of a side portion of the central frame portion.

FIG. 3 is a cross-sectional view of a joint fixing portion between a side portion and a front portion in a central frame portion.

FIG. 4 is a sectional view of a rear portion of the central frame portion.

FIG. 5 is a sectional view of a front frame portion.

FIG. 6 is a perspective view of the vicinity of the rear portion of the seat panel on the right side of the vehicle body, cut off in the vicinity of the central frame portion.

FIG. 7 is a perspective view of the vicinity of a seat panel on the left side of the vehicle body.

FIG. 8 is a plan view of the front part of the vehicle interior.

[Explanation of symbols]

2 Frame 4 Engine 5 Floor Panel 13 Front Seat (Seat) 14 Seat Panel (Seat) 31 Third Gusset (Gusset) 32 Fourth Gusset (Gusset) 51 Central Frame (Frame) 54 Inner Flange 55 Outer Flange 56 Lateral Part 57 front part 58 rear part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-62289 (JP, U) JP-A 56-22125 (JP, U) JP-A 63-21182 (JP, U) JP 4-96 16085 (JP, U) Shokai 56-48961 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (3)

(57) [Claims] 1. An automobile in which an engine is mounted below a floor panel, the lower surface of the floor panel has an opening that opens upward, and a flange is formed inside and outside the vehicle body at the opening edge. The respective frames are joined via inner and outer flanges thereof to form a closed cross section extending in the front-rear direction at the vehicle body side end between the floor panel and the frame, and the engine is disposed between the two frames.
Disposed, positioned to the side of the engine of the frame
Flange of the inner side at the site of the lower vehicle body structure, characterized in that provided extending upwardly. The frame corresponds to a front portion, a side portion, and a rear portion of the engine, and an inner flange corresponding to the side portion of the engine is provided to extend upward. The inner flanges corresponding to the front part and the rear part of the frame are bent inwardly with respect to the inner surface of the frame, while the outer flanges are bent outwardly with respect to the outer surface of the frame. The lower vehicle body structure of an automobile according to claim 1, wherein: 3. The floor panel, wherein a seat portion on which the seat is installed on the floor panel is provided so as to protrude stepwise with respect to the floor panel excluding the seat portion, and the seat portion and the inside and outside of the frame are provided. The vehicle seat mounting structure according to claim 1 or 2, wherein a gusset for connecting the seat portion and inner and outer flanges of the frame is provided between the flange and the flange.