JP3587657B2 - Cab floor structure - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cab floor structure for a truck or the like.
[0002]
[Prior art]
As shown in FIGS. 9 and 10, the cab floor of a cab-over type cab such as a truck has a center center floor 1a to 1c, side floors 2a to 2c on both sides thereof, and rear beds 3a to 3c. The main members 4a to 4d are formed. Incidentally, as a conventional example regarding the structure of the cab floor, there are those disclosed in Japanese Utility Model Registration No. 30021818, Japanese Utility Model Laid-Open No. 5-80975, and Japanese Utility Model Publication No. 7-2338.
[0003]
[Problems to be solved by the invention]
In the case of a cab-over type truck, different cab floors are used for large vehicles and medium vehicles. For example, as shown in FIGS. 9 and 10, a medium-sized normal vehicle type A in which a medium-sized center floor 1 a is combined with a medium width side floor 2 a, and a wide-sized side floor 2 b is combined with a medium-sized center floor 1 b (the same parts as 1 a). It is classified into a normal vehicle wide type B and a large vehicle type C combining a large center floor 1c and a large side floor 2c. These cab floors A to C require separate molds for press molding of the center floors 1a (1b) and 1c and the side floors 2a to 2c, respectively, and there is a problem that the cost of manufacturing these molds is large. Was.
[0004]
Regarding the main members 4a to 4c, since a large curved portion 5 is formed rearward at a portion extending to the lower surfaces of the beds 3a to 3c, cracks and wrinkles as shown in FIG. Therefore, as shown in FIG. 12, the bases of the main members 4a to 4c are divided into four parts 10 to 13, and the parts 12, 13 are superimposed on the inside of the parts 10, 11, respectively. For example, (1.4 + 1.6 = 3.0 mm) is ensured. Reference numeral 14 denotes a reinforcement for reinforcing the front of the base. Such a superimposed structure, of course, has a disadvantage that it requires a large number of processes and can be manufactured at low cost.
[0005]
The present invention has been made in view of such problems, and has as its object to integrate the cab floors of a large vehicle and a medium vehicle. Another object is to provide a lightweight and inexpensive main member.
[0006]
[Means for Solving the Problems]
In the first invention, in the center floor, the side floors on both sides of the center floor, and the cab floor including a main member and the like, which form these frameworks, the center floor is formed into a shape capable of mounting an engine for a large vehicle. The main member is joined to the lower surface of the side floor so as to extend on both sides of the center floor in the front-rear direction.
[0007]
In the first invention, a front portion of the center floor is formed on a low floor surface, and an inclined shape which is lowered forward so as to allow attachment and detachment of an air conditioner unit to and from an instrument panel is formed on a front portion of the low floor surface. .
[0008]
In the second invention , the main member in the first invention has a groove-shaped base formed integrally by press working.
[0009]
In the third invention, the main member of the second invention has a bead extending in a groove width direction on a bottom surface of a portion where the base having the groove-shaped cross section is bent backward.
[0010]
【The invention's effect】
In the first aspect, the large shape of the center floor enables application to a large vehicle. Since the side floor is the same width as that of a medium-sized car, the size of the side floor in the vehicle width direction is smaller than that of a conventional large-sized cab floor, so that it can be applied to a medium-sized car. That is, it can be integrated as a cab floor for a large vehicle and a medium-sized vehicle. Therefore, the manufacturing cost of the press die is also greatly reduced, and an inexpensive cab floor can be provided.
[0011]
Since the center floor has a shape in which an engine for a large vehicle can be mounted, in the case of a driver's cab of a medium-to-medium-sized vehicle having a low vehicle height, there is a possibility of causing interference with an air conditioner unit which is mounted on an instrument panel.
[0012]
In the first aspect, the interference with the center floor is avoided by the low floor surface having the inclined shape, so that the attachment and detachment of the air conditioner unit can be easily performed.
[0013]
In the second invention , since the base of the main member is formed as a single part by press working, the manufacturing cost of the press die is greatly reduced as compared with a base having a conventional four-part superposed structure. . Since the base is formed integrally, it is more advantageous in strength than the overlapping structure, and the same strength can be secured with a small thickness. As a result, an inexpensive and lightweight main member can be realized.
[0014]
In the third aspect, since the stress concentration at the time of the press working in the portion bent rearward of the base is reduced by the bead, the occurrence of cracks and wrinkles can be prevented.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIGS. 1 and 2, the cab floor D includes a center center floor 1d, side floors 2d on both sides thereof, a rear bed 3d, and a main member 4d, a front cross member 6d, and a rear frame which form a frame on the lower surface thereof. And a cross member 7d.
[0016]
The center floor 1d is formed in a shape in which a large vehicle engine can be mounted, and the side floor 2d for medium-sized vehicles is combined on both sides thereof . The main member 4d is joined (spot-welded) to the lower surface of the side floor 2d so as to extend in the front-rear direction on both sides of the center floor 1d, and is connected between the front cross member 6d and the rear cross member 7d.
[0017]
If the center floor 1d follows the conventional size for a large vehicle as it is, in the case of a driver's cab of a medium-sized vehicle having a low vehicle height, the center floor 1d interferes with a lower portion of an air conditioner unit attached to an instrument panel. Therefore, as shown in FIGS. 3 and 4, the front portion of the center floor 1d is formed on a low floor surface 20 which does not interfere with the radiator of the engine for a large vehicle, and allows the attachment and detachment of the air conditioner unit. Is provided with an inclined surface 21 descending to the front cross member 6d.
[0018]
In the driver's cab of a medium-sized car, as shown in FIG. 5, pull out the air conditioner unit 22 from the installation position of the instrument panel 23 in the extension direction of the inclined surface 21 (in the direction of arrow 1) and place it on a low floor The air conditioner unit 22 can be easily removed by moving the air conditioner unit rearward (in the direction of arrow {circle around (2)}).
[0019]
On both sides of the low floor surface 20, the width of the front portion of the floor is widened by a predetermined amount m (for example, 20 mm) as shown in FIG. 6 in order to avoid interference with the radiator of the engine for a large vehicle. The flange 25 of the main member 4d is spot-welded to the flange 26 of the center floor 1d with the side floor 2d interposed therebetween. If the width of the front part of the floor is increased by a predetermined amount m while maintaining the conventional shape, the required width H of spot welding is required. Cannot be secured.
[0020]
Therefore, reducing the radius of curvature R ₂ of the portion bent into flanges 26 than the conventional radius of curvature R ₁ (e.g., from _{R 1 = 15mm R 2 = 30mm} ) by setting, to ensure the necessary width H of the spot welding It has become. That is, by changing the shape as shown in FIGS. 4 and 6, it is possible to secure the necessary width H of spot welding at the front portion of the center floor 1d while avoiding interference with the radiator of the engine for a large vehicle.
[0021]
As for the main member 4d, in order to reduce the manufacturing cost by reducing the number of press dies, for example, as shown in FIG. The main part is composed of a reinforcement 31 that reinforces the structure and two parts. Since the base 30 is a single part formed by press molding, it is advantageous in terms of strength as compared with the conventional overlapping structure. Therefore, the plate thickness of the base 30 is set smaller than the total plate thickness (for example, 3.0 mm) of the conventional base that secures the same strength, for example, 2.0 to 2.3 mm. As a result, a lightweight main member can be manufactured at low cost.
By pressing the base 30, but results in a curved portion 32 applied to the underside of the bed 3d, the radius of curvature R ₄ as shown in FIG. 8 (e.g., 300 mm), the angle θ of a conventional with a ₂ radius of curvature R ₃ (e.g., 150 mm), and a plurality of beads 33 that are gently bent more than the bend at the angle θ ₁ and that extend in the groove width direction are formed on the bottom surface of the groove.
[0022]
Although the thickness of the plate subjected to the press working is larger than before, the bead 33 is formed by increasing the radius of curvature R ₄ and the angle θ ₂ of the curved portion 32, so that stress concentration at the time of the press working is eased. Cracks and wrinkles can be prevented from being generated in the curved portion 32 to 3d.
[0023]
Since the base 30 is a one-piece part having a considerable length, a location hole at the time of press working remains at the front part of the base, but the reinforce 31 is formed longer than the conventional one with the same plate thickness (for example, 2.3 mm). By connecting the location hole to the front portion of the base 30 so as to close the location hole, the strength of the base 30 can be effectively reinforced.
[0024]
A new cab floor D (see FIGS . 9 and 10 ) based on such a configuration is formed on substantially the same floor surface as the medium- and medium-sized vehicle wide type B, and the center floor 1d is capable of mounting an engine for a large vehicle. Due to its shape, it can be integrated as a cab floor for large trucks and medium-sized trucks. For this reason, the number of press dies is greatly reduced, so that the cab floor can be manufactured at low cost.
[0025]
As described above, the occurrence of cracks and wrinkles in the curved portion 32 is further reduced by the bead 33 as described above, so that the entire base 30 can be press-formed into one part. Therefore, it is possible to provide a lightweight and inexpensive main member while securing necessary strength.
[Brief description of the drawings]
FIG. 1 is a cab floor perspective explanatory view showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the cab floor.
FIG. 3 is an explanatory diagram of a shape of a center floor.
FIG. 4 is an explanatory view of the shape of the center floor.
FIG. 5 is an explanatory view of the shape of the center floor.
FIG. 6 is an explanatory view of the shape of the center floor.
FIG. 7 is an exploded perspective view of the main member.
FIG. 8 is an explanatory view of the shape of the member.
FIG. 9 is a comparison diagram with a conventional cab floor.
FIG. 10 is a comparison diagram with a conventional cab floor.
FIG. 11 is a partial perspective view of a main member for explaining a conventional problem.
FIG. 12 is an exploded perspective view of a conventional main member.
[Explanation of symbols]
D Cab floor 1d Center floor 2d Side floor 3d Bed 4d Main member 20 Low floor surface 21 of center floor Slope surface 22 of center floor Air conditioner unit 30 Base 32 of main member Curved portion 33 of main member 33 Bead

Claims (3)

In a cab floor including a center center floor, side floors on both sides of the center floor, and a main member forming these frameworks , the center floor is formed into a shape capable of mounting an engine for a large vehicle. while combining Namihaba side floor for car, it joins the main members extending on both sides of the center floor on the lower surface of the side floor back-and-forth direction, a front portion of the center floor air-conditioning unit so as to form a low floor Insutoru A cab floor structure characterized in that a sloping shape descending to the front is formed at a front portion of a low floor surface so as to allow attachment and detachment to and from a ment panel . 2. The cab floor structure according to claim 1, wherein the main member includes a groove-shaped base formed integrally by press working . The cab floor structure according to claim 2 , wherein the main member includes a bead extending in a groove width direction on a bottom surface of a portion where the base having the groove-shaped cross section is bent rearward.

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