JP5094680B2 - Truck bed structure - Google Patents

Description

  The present invention relates to a truck bed structure.

  A structure is known in which a lower part of a cargo bed is fixed to a vehicle body frame via a vertical joist extending in the front-rear direction of the vehicle and a horizontal joist extending in the vehicle width direction.

  The body frame includes a pair of left and right side frames extending in the front-rear direction. A spacer (packing material) extending in the front-rear direction is placed on the upper surface of each side frame, and a pair of left and right vertical joists are placed on the upper surface of the spacer and connected to the side frame via a joining plate. Fixed. The horizontal joists cross the left and right vertical joists and are fixed to the upper surface of the vertical joists, and the floor board of the loading platform is placed and fixed on the horizontal joists.

Japanese Utility Model Publication No. 7-33778 JP 2006-123771 A

  In the conventional structure described above, since the spacer is interposed between the side frame and the vertical joist, the cost increases due to the increase in the number of parts and the structure becomes complicated. Here, such an inconvenience can be avoided by omitting the spacer, placing the vertical joist on the upper surface of the side frame, and bringing them into surface contact. However, if the rivet head protrudes from the center of the side frame in the vehicle width direction, the bottom of the vertical joist cannot be brought into surface contact with the upper surface of the side frame, and the vertical joist is stable on the side frame. Can not be placed in the state. That is, the vertical joists cannot be fixed to the side frames simply by omitting the spacers.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a truck bed bottom structure capable of simplifying the structure and reducing the cost.

In order to achieve the above object, the present invention provides a truck for mounting and fixing a pair of left and right subframes extending in the front-rear direction on the upper surfaces of a pair of side frames extending in the front-rear direction in the left-right direction in the vehicle width direction. The sub-frame has a loading platform lower structure, and the sub-frame includes a side plate erected along the vertical direction, a lower plate extending inward in the vehicle width direction from the lower end of the side plate, and an upper plate extending inward in the vehicle width direction from the upper end of the side plate. It has a substantially U-shaped cross section. The width of the lower plate, which is the distance in the vehicle width direction from the outer surface of the side plate to the tip of the lower plate, is set shorter than the width of the upper plate, which is the distance in the vehicle width direction from the outer surface of the side plate to the tip of the upper plate. Yes. The width of the lower plate of the subframe is a length that does not interfere with the rivets protruding from the upper surface of the side frame, and is a length that can effectively and sufficiently transmit the load acting on the upper plate of the subframe to the side frame. Thus, it is set in the range of 25% or more and 60% or less of the width along the vehicle width direction of the upper surface of the side frame on which the lower plate is placed.

  In the above configuration, since the width of the lower plate of the subframe is set in the range of 25% to 60% of the width of the upper surface of the side frame, the load acting on the subframe from the loading platform is effectively and sufficiently increased. Can be transmitted to the frame.

  Since the width of the lower plate of the subframe is set shorter than the width of the upper surface of the side frame, the weight of the entire subframe can be reduced, which contributes to cost reduction.

  Since the subframe is placed on the upper surface of the side frame without interposing another member such as a spacer, the structure can be simplified, which contributes to cost reduction.

Even when a rivet protrudes from the upper surface of the side frame, the subframe can be placed and fixed on the upper surface of the side frame without interposing another member such as a spacer.

  According to the present invention, the structure can be simplified and the cost can be reduced.

  A truck bed lower structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the entire structure of the lower part of the loading platform of the present embodiment, FIG. 2 is a sectional view of the main part of FIG. 1, and FIG. 3 shows a distribution state of loads acting on the upper surface of the side frame from the bottom plate It is a figure, (a) shows the relationship between the distance from a web surface, and a load, (b) has shown the model shape of simulation. In the figure, the arrow FR indicates the front of the vehicle, the arrow IN indicates the inner side in the vehicle width direction, and the arrow UP indicates the upper side.

  As shown in FIGS. 1 and 2, the body frame of the truck includes a pair of left and right side frames 1 extending in the front-rear direction. Each side frame 1 includes a side wall 2 erected along the vertical direction, a lower wall 3 extending inward in the vehicle width direction from a lower end of the side wall 2, and an upper wall 4 extending outward in the vehicle width direction from the upper end of the side wall 2. Having a substantially U-shaped cross section. The side frame 1 may have a rectangular cylindrical shape.

  On the upper surface of the upper wall 4 of each side frame 1, vertical joists (subframes) 5 extending in the front-rear direction are respectively placed. Each of the vertical joists 5 includes a side plate 6 erected along the vertical direction, a lower plate 7 extending inward in the vehicle width direction from the lower end of the side plate 6, and a lower plate 7 facing the lower plate 7 from the upper end of the side plate 6. It has a substantially U-shaped cross section with an upper plate 8 extending inward.

  A rivet (rivet head) 15 for fixing a reinforcing member or the like to the side frame 1 protrudes from a central portion in the vehicle width direction on the upper surface of the upper wall 4 of the side frame 1. The rivets 15 are respectively arranged at a plurality of predetermined positions in the front-rear direction of the side frame 5.

  The outer surface of the side plate 6 of the vertical joist 5 and the outer surface of the side wall 2 of the side frame 1 are arranged in the same plane so that the positions in the vehicle width direction substantially coincide with each other, and are flat plate-like fastening plates straddling on both outer surfaces 9 is arranged. The upper part of the fastening plate 9 is fastened and fixed to the side plate 6 of the vertical joist 5 by bolts 10 and nuts 11, and the lower part of the fastening plate 9 is fastened and fixed to the side walls 2 of the side frames 1 by bolts 12 and nuts 13. Thereby, the side plate 6 of the vertical joist 5 and the side wall 2 of the side frame 1 are coupled via the fastening plate 9.

  A plurality of horizontal joists 14 crossing the vertical joists 5 are placed on the upper surface of the upper plate 8 of the left and right vertical joists 5, and the vertical joists 5 and the horizontal joists 14 are fastened through angle clips 16. Fixed. On the side joists 14, a floor plate (not shown) of the loading platform is placed and fixed.

The width along the vehicle width direction of the lower plate 7 of the vertical joists 5 (the distance in the vehicle width direction from the outer surface of the side plate 6 to the tip of the lower plate 7) W2 is the width along the vehicle width direction of the upper surface of the side frame 1. (Distance in the vehicle width direction from the outer surface of the side wall 2 to the tip of the upper wall 4) The length is in a range of 25% to 60% of W1 and does not interfere with the rivet 15. In this embodiment, the width of the upper plate 8 of the vertical joists 5 (the distance in the vehicle width direction from the outer surface of the side plate 6 to the tip of the upper plate 8) W3 is longer than the width W2 of the lower plate 7 and lower. It is set to be equal to or less than the maximum length of the width W2 of the plate 7 (60% of the width W1 of the upper surface of the side frame 1).

  Next, the reason why the width W2 of the lower plate 7 of the vertical joists 5 is set in the above range with respect to the width W1 of the upper surface of the side frame 1 will be described.

  As shown in FIG. 3B, the vertical joists 20 having the widths of the lower plate 21 and the upper plate 22 approximately equal to the width W1 of the upper surface of the side frame 1 are placed on the upper surface of the side frame 1 (the upper surface of the upper wall 4). When a load is applied from the upper plate 22 of the vertical joist 20 (load assuming the total weight of the loading platform weight and the product load), the lower plate 21 of the vertical joist 20 is applied to the upper wall 4 of the side frame 1. As shown in FIG. 3A, a load proportional to the inverse of the cube of the distance in the vehicle width direction (distance from the web surface) from the outer surface of the vertical plate 6 (the outer surface of the vertical wall 2) acts. It can be seen that most of the load is applied in the range close to the web surface. Specifically, the rate of increase of the load ratio with respect to the increase in the distance from the web surface increases rapidly to a range of 25% of the width W1 of the upper surface of the side frame 1, and the distance from the web surface is 25%. In the range of (0.25 × W1), the load of 93% or more of the total load is borne, and in the range of 60% (0.6 × W1), the load of 99.5% or more of the total load is borne. I know that. Therefore, by setting the distance from the web surface of the lower plate 21 to 25% (0.25 × W1) or more and 60% (0.6 × W1) or less, the load acting on the vertical joist 20 is effectively and sufficiently obtained. Can be transmitted to the side frame 1, and the loading platform can be reliably supported by the side frame 1.

  For this reason, the width W2 of the lower plate 7 of the vertical joist 5 is a range in which the load acting on the vertical joist 5 can be effectively and sufficiently transmitted to the side frame 1 (on the upper surface of the side frame 1). The width W1 is in the range of 25% to 60%) and is set to a length that does not interfere with the rivet 15.

  As described above, according to the present embodiment, the width W2 of the lower plate 7 of the vertical joists 5 is set in the range of 25% to 60% of the width W1 of the upper surface of the side frame 1, so Therefore, the load acting on the subframe 1 can be effectively and sufficiently transmitted to the side frame 1.

  Since the width W2 of the lower plate 7 of the vertical joist 5 is set shorter than the width W1 of the upper surface of the side frame 1, the entire vertical joist 5 can be reduced in weight, which contributes to cost reduction.

  Since the vertical joists 5 are placed on the upper surface of the side frame 1 without interposing another member such as a spacer, the structure can be simplified, which contributes to cost reduction.

  Further, since the width W2 of the lower plate 7 of the vertical joist 5 is set to a length that does not interfere with the rivets 15 protruding from the upper surface of the side frame 1, the vertical joist 5 can be used without interposing another member such as a spacer. Can be placed and fixed on the upper surface of the side frame 1.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

It is a perspective view showing the whole loading platform lower part structure of one embodiment of the present invention. It is principal part sectional drawing of FIG. It is a figure which shows the distribution state of the load which acts on the upper surface of a side frame from the bottom plate of a vertical joist, (a) shows the relationship between the distance from a web surface, and a load, (b) shows the model shape of simulation. .

Explanation of symbols

1 Side frame 4 Upper wall 5 Vertical joist (subframe)
6 Side plate 7 Lower plate 8 Upper plate 15 Rivet W1 Width of upper surface of side frame W2 Width of bottom plate of vertical joist w3 Width of upper plate of vertical joist

Claims (2)

A truck bed bottom structure for mounting and fixing a pair of left and right subframes extending in the front-rear direction on the upper surfaces of a pair of side frames extending in the front-rear direction on the left and right in the vehicle width direction,
The sub-frame has a substantially U shape including a side plate erected along the vertical direction, a lower plate extending inward in the vehicle width direction from the lower end of the side plate, and an upper plate extending inward in the vehicle width direction from the upper end of the side plate. The width of the lower plate, which has a cross section and is the distance in the vehicle width direction from the outer surface of the side plate to the tip of the lower plate, is the distance in the vehicle width direction from the outer surface of the side plate to the tip of the upper plate. Set shorter than the width of the upper plate,
Width of the lower plate of the subframe, a length that does not interfere with the rivet projecting from the upper surface of the side frame, to effectively and sufficiently the side frame load acting on the upper plate of the subframe The truck is set in a range of 25% or more and 60% or less of the width along the vehicle width direction of the upper surface of the side frame on which the lower plate is placed so that the length can be transmitted. The bottom structure of the cargo bed. The truck bed structure according to claim 1,
The side frame includes a side wall erected along the vertical direction, and an upper wall on which the sub frame is placed extending from the upper end of the side plate inward in the vehicle width direction,
A truck loading platform lower structure , wherein a side plate of the subframe and a side wall of the side frame are coupled to each other through a connecting frame .

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