JPH1095370A - Reinforcing structure of deck for small-sized truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve durability and reliability of a desk against torsion. SOLUTION: A plurality of sill cross members 14, having a pair of flanges 14a in an upper end, both wall parts 14b continued to the flange and a bottom part 14c connecting a lower end of both the wall parts, are arranged in an advance direction with a space apart in a floor panel lower surface of a deck of a small-sized truck, a pair of the flanges 14a are spot welded to a floor panel. Of a pair of the flanges 14a in the sill cross member 14 arranged in the floor panel, one flange is separated without being spot welded to the floor panel in a member intermediate part. Both side parts of the sill cross member 14 are in an inverse hat-shaped section, in both the side parts, a pair of the flanges 14a of the sill cross member 14 are spot welded to a lower surface of the floor panel, in an intermediate part of the sill cross member 14, of a pair of the flanges 14a, only the other flange is spot welded to the lower surface of the floor panel, one flange is preferably separated apart from the floor panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small truck deck reinforcing structure in which a sill cross member is spot-welded to the lower surface of a floor panel constituting a small truck deck at intervals in the traveling direction of the truck.

[0002]

2. Description of the Related Art A small truck is provided with a deck behind a cab, and can carry a load by loading a load on the deck. When traveling with the luggage loaded on the deck, since the vertical load due to the luggage and the torsional load due to the traveling of the truck are applied to the deck, the lower surface of the floor panel constituting the conventional deck is provided on the lower surface of the conventional deck so as to sufficiently withstand this load. A plurality of sill cross members are spot-welded at intervals in the traveling direction of the track. The sill cross member is generally formed in an inverted hat shape in cross section having a pair of flanges at the upper end and having two walls following the flange and a bottom connecting the lower ends of the two walls. The small truck deck is reinforced by spot welding to the lower surface of the floor panel. On the other hand, spot welding is a type of resistance welding, in which a pair of flanges and a floor panel are pressurized by opposing electrodes and are joined by utilizing resistance heat generated by short-time application of a large current. It has good productivity, easy control of welding parameters, and features suitable for automation.

[0003]

However, the reinforcing structure of the deck using the sill cross member formed in an inverted hat shape in cross section shows excellent fatigue strength against bending load represented by vertical load, but is not suitable for torsional load. On the other hand, the fatigue strength may not be sufficient. That is, in the sill cross member formed in an inverted hat shape in cross section, since a pair of flanges are connected by both walls and the bottom, the amount and direction of deformation of each flange caused by torsion are different, and Stress may not be applied uniformly to multiple spot welds on each flange. This phenomenon is particularly remarkable in the middle portion of the deck where the cargo is loaded, and the durability of the spot welded portion in the middle portion of the deck to torsion may be reduced. As described above, when stress due to torsion is concentrated only at a specific spot welding location, the spot welding location where the stress is concentrated may be damaged, and when a part of the plurality of spot welding locations is damaged, The stress is sequentially concentrated on other spot welded portions, and as a result, the fatigue strength of the spot welded portions is reduced, and the sill cross member is peeled off from the floor panel or the sill cross member itself is deformed. It may be deformed or damaged.

[0004] To solve this problem, it is conceivable to increase the thickness of the floor panel to increase the number of spot welding spots, or to change the joining by spot welding to another joining method such as a bolt. However, these methods have problems that the weight of the product increases and the unit price of the product increases with the increase in the number of manufacturing steps. SUMMARY OF THE INVENTION It is an object of the present invention to provide a small truck deck reinforcing structure capable of improving the durability and reliability of the deck against torsion caused by running of the small truck.

[0005]

The invention according to claim 1 is
As shown in FIGS. 1 and 10, a pair of flanges 14a,
A plurality of inverted cross hat-shaped sill cross members 14 having an upper end 14a and having two walls 14b, 14b following the flanges 14a, 14a and a bottom 14c connecting the lower ends of the two walls 14b, 14b are small in size. The truck 1 is provided on the lower surface of the floor panel 12a constituting the deck 12 of the truck 10.
This is an improvement of the reinforcing structure of the small truck deck, which is disposed at intervals in the traveling direction of 0 and the pair of flanges 14a, 14a of the sill cross member 14 are spot-welded to the floor panel 12a. The characteristic configuration is that one of the pair of flanges 14a, 14a of the sill cross member 14 disposed on the floor panel 12a is separated from the floor panel 12a at the middle portion of the member without spot welding to the floor panel 12a. . In the reinforcing structure of the small truck deck configured as described above, the stress applied to the sill cross member 14 disposed on the floor panel 12a due to the torsion of the deck 12 is not applied to one flange 14a and the other flange 14a is applied. To prevent the stresses of different deformation directions and deformation amounts generated in the pair of flanges 14a, 14a from concentrating on a specific spot welding location.

The invention according to claim 2 is the invention according to claim 1, wherein both sides 14d, 14d of the sill cross member 14 provided on the floor panel 12a have an inverted hat shape in cross section. The pair of flanges 14a, 14a of the sill cross member 14 are spot-welded to the lower surface of the floor panel 12a at both side portions 14d, 14d, and only the other flange 14a of the pair of flanges 14a, 14a at the middle portion of the sill cross member 14 is provided. The lower surface of the floor panel 12a is spot-welded, and one flange 14a is separated from the floor panel 12a. The release of one of the flanges 14a from the floor panel 12a can be performed by not spot-welding the one of the flanges 14a to the floor panel 12a. However, the shape of the intermediate portion of the sill cross member 14 is changed with respect to the side portions 14d, 14d. By deforming and separating one flange 14a from the floor panel 12a and releasing it, the strength of the sill cross member 14 itself is ensured by applying an external force applied to the sill cross member 14 only to the other flange 14a. , One flange 14a is the floor panel 1
The generation of squeak noise caused by contact with 2a is prevented. In addition, the sill cross member 14 has a constant development shape, and one flange 14a is attached to the floor panel 12.
The wall 14b on the side of the other flange 14a to be welded to the floor panel 12a can be enlarged by a distance corresponding to the distance a. As a result, by forming the cross-sectional shape into a Z-shaped cross-section, the cross-sectional rigidity of the sill cross member 14 with respect to the vertical load can be increased.

According to a third aspect of the present invention, as shown in FIG. 6, a pair of flanges 14a, 14a are provided at the upper end, and both walls 14b, 14b following the flanges 14a, 14a and the two walls 14b, 14b. Sill cross members 14 having an inverted hat shape in cross section having a bottom portion 14c connecting the lower ends of
Are arranged on the lower surface of the floor panel 12a constituting the deck 12 of the small truck 10 at intervals in the traveling direction of the truck 10, and a pair of flanges 1 of the sill cross member 14 are provided.
Reference numerals 4a and 14a show improvements in the reinforcing structure of the small truck deck spot-welded to the floor panel 12a. The characteristic configuration is that the sill cross member 1 is provided at the bottom of the middle of the sill cross member 14 disposed on the floor panel 12a.
The long hole 14 e for stress absorption is formed along the longitudinal direction of No. 4. The elongated hole 14e for absorbing external force absorbs or reduces deformation or stress caused by torsion applied to the sill cross member 14, and the pair of flanges 14a,
The stress concentration is prevented from occurring at the spot welding portion provided at 14a.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. As shown in FIG. 10, the small truck 10 includes a cab 11 and a rear deck 12 formed separately from the cab 11 and provided behind the cab 11. The lower surface of the lower panel 11a of the cab 11 is supported by a pair of side members 13 (only one side is shown in the figure) provided to extend in the traveling direction of the vehicle at an interval on the left and right. The lower surface of the floor panel 12a is similarly supported. As shown in FIG. 9, a rear deck 12 includes a front panel 12b, a rear panel 12c, and a pair of side panels 1 forming both sides.
A frame is formed by 2d (only one is shown in the figure), and the frame is assembled by attaching a floor panel 12a that forms a floor. A plurality of sill cross members 14 are arranged on the lower surface of the floor panel 12a at intervals in the traveling direction of the truck 10.

As shown in FIG. 2, the sill cross member 14
Is formed by bending a steel plate by sheet metal processing,
A pair of flanges 14a, 14a are provided at the upper end, and both wall portions 14b, 14b following the pair of flanges 14a, 14a.
And a bottom portion 14 connecting the lower ends of the two wall portions 14b, 14b.
c is formed in an inverted hat shape. The sill cross member 14 includes a pair of flanges 14a, 14a formed on the upper end thereof, and a pair of rear deck floor panels 12a.
The deck 12 is reinforced by spot welding to the lower surface of the deck 12.

As shown in FIGS. 1 to 3, one of the pair of flanges 14a of the sill cross member 14 disposed on the floor panel 12a is one of the flanges 14a. Floor panel 12
a is not spot-welded but is released. This release is performed by not spot welding one flange 14a to the floor panel 12a. The sill cross member 14 of the floor panel 12a is
The shapes of d and 14d are reverse hat-shaped in cross section, and one flange 14a at an intermediate portion of the sill cross member 14 is separated and separated from the floor panel 12a. As shown in FIG. 2, both side portions 14d, 1 of the sill cross member 14 are provided.
4d, the pair of flanges 14a, 14a are spot-welded to the lower surface of the floor panel 12a, and as shown in FIG. 3, the shape of the middle portion of the sill cross member 14 is such that one wall portion 14b is lower than the other wall portion 14b. Then, one flange 14a following the one wall portion 14b is formed in a concave shape. In this intermediate portion, only the other flange 14a of the pair of flanges 14a, 14a is spot-welded to the lower surface of the floor panel 12a, and the one flange 14a continuous with one wall portion 14b is separated from the floor panel 12a and separated. .

In the reinforcing structure for a small truck deck configured as described above, the sill cross member 1 disposed at the center of the floor panel 12a due to the twist of the deck 12 is provided.
By applying an external force applied to the flange 4 only to the other flange 14a, it is possible to prevent the occurrence of stress concentrated in a specific spot welded portion having a different deformation direction and deformation amount when the pair of flanges 14a, 14a are spot-welded, respectively. To prevent spot welding from being damaged.

In the above-described embodiment, the shape of the middle portion of the sill cross member 14 provided on the floor panel 12a is made lower by making one wall portion 14b lower than the other wall portion 14b. 4 and 5, the height of the other wall portion 14b at the intermediate portion of the sill cross member 14 is increased so that the developed shape of the sill cross member 14 becomes constant, as shown in FIGS. Even if it is made larger and the height of one wall portion 14b is made smaller, the other wall portion 14b and the other flange 14a and the bottom portion 14c continuous with the wall portion 14b form a Z-shaped cross section. Good. In this case, a flange 14a and a bottom portion 14c that are continuous with one wall portion are formed to be curved at an intermediate portion of the sill cross member 14. In the intermediate portion formed in the Z-shaped cross section, the other flange 14 formed continuously with the other wall portion 14b of the pair of flanges 14a, 14a.
a is spot-welded to the lower surface of the floor panel 12a, and the external force applied to the sill cross member 14 is applied only to the other flange 14a.
The bending strength can be enhanced by its own vertical cross-sectional rigidity.

FIGS. 6 to 8 show another embodiment of the present invention. The same reference numerals as those described above denote the same parts, and a description thereof will not be repeated. A characteristic configuration of the present embodiment is that a stress absorbing slot 14 e is formed along the longitudinal direction of the sill cross member 14 at the central bottom 14 c of the four sill cross members 14 disposed on the floor panel 12 a. It is where it was formed. The sill cross member 14 is formed in the same cross section with a reverse hat shape by bending a steel sheet by sheet metal processing, and the stress absorbing long holes 14e are simultaneously formed in the bottom portion 14c by sheet metal processing when bending the steel sheet.
In this sill cross member 14, a pair of flanges 14a,
14a is spot welded to the lower surface of the floor panel 12a. In the reinforcing structure of the small truck deck configured as described above, the floor panel 1 caused by the torsion of the deck 12 is used.
The elongated holes 14e absorb the difference in the deformation amount and the deformation direction of the flanges 14a, 14a due to the torsion applied to the sill cross member 14 disposed at the center of 2a, and the specific shape of the flanges 14a, 14a is determined. Prevents stress from concentrating on spot welds.

[0014]

As described above, according to the present invention, one of the pair of flanges of the sill cross member disposed on the floor panel is separated from the floor panel at the intermediate portion of the member, so that the deck can be mounted. Stress applied to the sill cross member due to torsion can be applied only to the other flange, so that stresses of different deformation directions and deformation amounts generated in the pair of flanges can be prevented from concentrating on a specific spot welding location. . As a result, it is possible to improve the durability and reliability of the deck against torsion caused by running of the small truck.

The sill cross member disposed at the center of the floor panel has an inverted hat-shaped cross section on both sides, and a pair of flanges of the sill cross member are spot welded to the lower surface of the floor panel on both sides. The shape of the middle portion of the sill cross member disposed on the floor panel is Z-shaped in cross section, and only the other flange of the pair of flanges is spot-welded to the lower surface of the floor panel at the middle portion. The strength due to the cross-sectional rigidity of the member itself is improved, and generation of squeak noise caused by one of the flanges abutting on the floor panel can be prevented. Further, if a long hole for stress absorption is formed along the longitudinal direction of the sill cross member at the center of the bottom of the sill cross member provided at the center of the floor panel, the torsion applied to the sill cross member by the long hole for stress absorption can be obtained. Is absorbed or reduced, and stress concentration is prevented from occurring at spot welding portions provided on the pair of flanges. As a result, it is possible to improve the fatigue strength of the spot-welded portions, and to improve the durability and reliability of the deck.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sill cross member of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a view corresponding to FIG. 1 showing another sill cross member of the present invention.

FIG. 5 is a sectional view taken along line CC of FIG. 4;

FIG. 6 shows yet another sill cross member of the present invention.
FIG.

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is a sectional view taken along line EE of FIG. 6;

FIG. 9 is an exploded perspective view showing the structure of the deck.

FIG. 10 is a side sectional view of a vehicle provided with the deck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Small truck 12 Deck 12a Floor panel 14 Sill cross member 14a Flange 14b Wall 14c Bottom 14d Side 14e Long hole for stress absorption

Claims (3)

[Claims] An upper end having a pair of flanges (14a, 14a) and connecting the lower ends of both walls (14b, 14b) following the flanges (14a, 14a) and the lower ends of the both walls (14b, 14b). A plurality of sill cross members (14) having a cross section inverted hat shape having a bottom portion (14c) are provided on a lower surface of a floor panel (12a) constituting a deck (12) of a small truck (10) in a traveling direction of the truck (10). And a pair of flanges (14) of the sill cross member (14).
a, 14a) is spot-welded to the floor panel (12a) in a reinforcing structure for a small truck deck, wherein a sill cross member disposed on the floor panel (12a) is provided.
One of the flanges (14a, 14a) of (14)
(a) is separated from the floor panel (12a) at the intermediate portion of the member without spot welding, and is separated from the floor panel (12a). 2. The shape of both sides (14d, 14d) of a sill cross member (14) disposed on a floor panel (12a) is an inverted hat-shaped cross section, and A pair of flanges (14a, 14a) of the sill cross member (14) are spot-welded to the lower surface of the floor panel (12a), and a pair of flanges (14a, 14a) are provided at an intermediate portion of the sill cross member (14). The light truck deck according to claim 1, wherein only the other flange (14a) is spot-welded to the lower surface of the floor panel (12a), and one flange (14a) is separated from the floor panel (12a). Reinforcement structure. 3. A pair of flanges (14a, 14a) having an upper end and connecting both walls (14b, 14b) following the flanges (14a, 14a) and lower ends of the both walls (14b, 14b). A plurality of sill cross members (14) having a cross section inverted hat shape having a bottom portion (14c) are provided on a lower surface of a floor panel (12a) constituting a deck (12) of a small truck (10) in a traveling direction of the truck (10). And a pair of flanges (14) of the sill cross member (14).
a, 14a) is spot-welded to the floor panel (12a) in a reinforcing structure for a small truck deck, wherein a sill cross member disposed on the floor panel (12a) is provided.
A reinforcing structure for a small truck deck, characterized in that a stress absorbing slot (14e) is formed along the longitudinal direction of the sill cross member (14) at the bottom of the intermediate portion of (14).