JP2014104860A - Structure for mounting truck cargo bed - Google Patents

Abstract

PROBLEM TO BE SOLVED: To strike a balance between the improvement of cargo bed durability for extending the durability life of a cargo bed and the securement of the cargo bed connection stability for suppressing the deflection of the cargo bed.SOLUTION: A semi-trailer truck cargo bed mounting structure A is provided for mounting a cargo bed 2 on an upper surface of a pair of chassis frames 1 disposed while being extended in the vehicle fore-and-aft direction of a truck. The structure includes a cargo bed elastic support structure A1 and a displacement control connecting structure A2. The cargo bed elastic support structure A1 is set between the cargo bed 2 and the chassis frame 1, and elastically supports the cargo bed 2 to the chassis frame 1. The displacement control connection structure A2 is set in parallel with the cargo bed elastic support structure A1. The cargo bed 2 is connected with the chassis frame 1 to each other, while controlling relative displacement except the vertical direction of the vehicle by allowing the relative displacement of the vehicle in the vertical direction among the relative displacement caused by the elastic support between the cargo bed 2 and the chassis frame 1.

Description

  The present invention relates to a truck bed mounting structure in which a truck bed is mounted on the upper surfaces of a pair of chassis frames that extend in the vehicle longitudinal direction of the truck.

  Conventionally, as a truck bed mounting structure, in the truck bed consisting of flooring, horizontal joists and vertical joists, the vertical joists and chassis frame are fixed by a fastening structure having a mounting bolt, a connecting tool and a fastening tool. Is known (see, for example, Patent Document 1). Similarly, it is known that a horizontal joist, a vertical joist, and a chassis frame are fastened and fixed by bolts and nuts via a single bracket (for example, see Patent Document 2). Further, as a truck bed mounting structure, a structure in which an elastic member is interposed in a connecting structure from a horizontal joist to a chassis frame via a body side mounting bracket and a frame side mounting bracket is known (for example, a patent) Reference 3).

JP 2007-320421 A JP 2009-107403 A JP 2005-271731 A

  However, the truck bed structure of Patent Documents 1 and 2 has a rigid support / connection structure in which a cargo bed having horizontal joists and vertical joists and a chassis frame are fastened together. For this reason, although the platform connection stability is ensured so that the lateral swing of the platform relative to the chassis frame is reliably suppressed, there is no input damping function applied to the platform, and an excessive input exceeding the strength limit of the platform is added. There was a problem that the loading platform was deformed or damaged.

  On the other hand, the truck bed structure of Patent Document 3 has an elastic support / connection structure in which an elastic member is interposed in series with two brackets for the horizontal joists and chassis frame of the bed. Therefore, if a large-capacity elastic member is interposed so as to enhance the damping function, the swinging of the loading platform with respect to the chassis frame increases, and the loading platform connection stability cannot be ensured. As a result, a small-capacity elastic member that inevitably secures the carrier connection stability is interposed in the connecting portion, and even if it is possible to prevent bracket cracking due to vibration input in the elastic deformation region, the elastic deformation is limited. There is a problem that it does not have a damping function for an excessive input exceeding that and does not extend the durable life of the loading platform.

  The present invention has been made paying attention to the above-mentioned problem, and is a truck capable of achieving both improvement of the loading platform durability that extends the durability life of the loading platform and securing of the loading platform connection stability that suppresses the swinging of the loading platform. An object of the present invention is to provide a load carrier structure.

In order to achieve the above-described object, the present invention provides a truck bed support structure in which a truck bed is mounted on the upper surface of a pair of chassis frames that extend in the vehicle longitudinal direction of the truck. And a regulation connecting structure.
The loading platform elastic support structure is set between the loading platform and the chassis frame, and elastically supports the loading platform with respect to the chassis frame.
The displacement regulation connecting structure is set in parallel with the cargo bed elastic support structure, and allows relative displacement in the vehicle vertical direction among the relative displacements generated by the elastic support of the cargo bed and the chassis frame, while other than the vehicle vertical direction. The cargo bed and the chassis frame are connected to each other while restricting relative displacement.

As described above, in the platform elastic support structure, the platform is elastically supported with respect to the chassis frame, and in the displacement restricting connection structure, the relative displacement in the vehicle vertical direction out of the relative displacement caused by the elastic support of the platform and chassis frame is Permissible.
Therefore, an excessive input attenuation function that attenuates an excessive input applied to the loading platform due to the dropping of the load, etc. will be demonstrated, and the deformation and damage of the loading platform due to the excessive input will be prevented, and the loading platform durability will be improved to extend the service life of the loading platform. Is achieved.
As described above, in the displacement regulation connecting structure, the cargo bed and the chassis frame are coupled to each other while regulating the relative displacement other than the vehicle vertical direction among the relative displacements generated by the elastic support of the cargo bed and the chassis frame.
Therefore, the function of restraining the platform sway with respect to the chassis frame when driving on rough roads or turning, etc., will be demonstrated. The loading platform connecting stability is secured.
In this way, the displacement regulation connecting structure arranged in parallel with the platform elastic support structure is configured to adjust the excessive input damping function and the platform swing restraint function, thereby improving the platform durability and extending the platform life. It is possible to achieve both the securement of the platform connection stability that suppresses the shake.

It is the side view (a) and top view (b) which show the trailer of the semi-trailer truck to which the loading platform mounting structure of Example 1 was applied. It is the side view (a) and bottom view (b) which show the loading platform of the trailer to which the loading platform mounting structure of Example 1 was applied. It is a longitudinal cross-sectional view which shows the loading platform structure of the trailer provided with the loading platform mounting structure of Example 1. FIG. It is the B section expanded sectional view of Drawing 3 showing details of a loading platform mounting structure of Example 1. It is a C direction arrow directional view of FIG. 4 which shows the detail of the loading platform mounting structure of Example 1. FIG. FIG. 6 is an explanatory diagram of a loading platform input damping action showing a comparison between loading platform input characteristics in Comparative Example 1 and loading platform input characteristics in Example 1 when a load is dropped on a loading platform of a semi-trailer truck. FIG. 6 is an explanatory diagram of a platform swing suppression action showing a platform behavior during traveling in a loaded state on the semi-trailer truck according to the first embodiment.

  Hereinafter, the best mode for realizing the truck bed structure of the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
The structure of the loading platform mounting structure A of the semi-trailer truck (an example of the truck) in the first embodiment will be described by dividing it into [loading platform configuration] and [detailed configuration of the loading platform mounting structure].

[Loading platform configuration]
FIG. 1 shows a trailer of a semi-trailer truck to which the loading platform mounting structure A of the first embodiment is applied. FIG. 2 shows a trailer bed. FIG. 3 shows the loading platform configuration of the trailer. Hereinafter, based on FIGS. 1-3, a loading platform structure is demonstrated.

  The semi-trailer truck to which the loading platform mounting structure A of the first embodiment is applied is based on the assumption that both a tractor (towing vehicle) (not shown) and a trailer T (towed vehicle) shown in FIG. 1 are connected. Therefore, when connecting, the connecting portion of the tractor becomes the front wheel of the trailer T.

  As shown in FIG. 1, the trailer T includes a chassis frame 1, a loading platform 2, a rear wheel 3, a rear bumper 4, a tractor connecting pin 5, and a loading platform mounting structure A.

  A pair of the chassis frames 1 are arranged to extend in the vehicle front-rear direction of the trailer T, and a loading platform 2 having a long box shape with an open upper portion is mounted on the upper surface thereof.

  The loading platform 2 is composed of a high-tensile steel plate, and as shown in FIG. 2, left and right side plates 21, 22, a front plate 23, a rear plate 24, and an upper end frame 25 that surrounds these upper ends in a square shape. The bottom plate 26 and a corner frame 27 provided to cover the four corners. That is, as shown in FIG. 2 (a), a plurality of vertical stays are provided between the corner frames 27 in order to reinforce the left and right side plates 21, 22, and the bottom plate as shown in FIG. 2 (b). In order to reinforce 26, the vertical joists and the horizontal joists provided in the form of a cross-beam are omitted from the entire bottom plate 26.

  As shown in FIG. 3, the left and right side plates 21 and 22 of the loading platform 2 are inclined plate portions 21a and 22a inclined outward from the inner surface of the upper end frame 25 toward the outer surface, and the inclined plate portions 21a and 22a. Flat plate portions 21b and 22b extending vertically downward from the bent lower end, and curved plate portions 21c and 22c formed at portions where the flat plate portions 21b and 22b and the bottom plate 26 by the flat plate intersect, are configured. .

  As shown in FIG. 3, the truck bed structure A includes a bed elastic support structure A <b> 1 and a displacement regulation connection structure A <b> 2. The carrier elastic support structure A1 is set between the carrier 2 and the chassis frame 1 and elastically supports the carrier 2 with respect to the chassis frame 1. The displacement restricting connection structure A2 is set in parallel with the load carrier elastic support structure A1, and allows the relative displacement in the vehicle vertical direction among the relative displacements caused by the elastic support of the load carrier 2 and the chassis frame 1, while other than the vehicle vertical direction. The loading platform 2 and the chassis frame 1 are connected to each other while restricting the relative displacement of the two. The chassis frame 1 is elastically supported with respect to the rear wheel 3 by a suspension (not shown).

[Detailed structure of loading platform structure]
4 and 5 show details of the loading platform mounting structure of the first embodiment. Hereinafter, based on FIG.4 and FIG.5, the detailed structure (a bed elastic support structure A1 and a displacement control connection structure A2) of the bed mounting structure A is demonstrated.

As shown in FIGS. 4 and 5, the cargo bed elastic support structure A <b> 1 is configured by interposing a rubber elastic body 6 between opposed surfaces of the bottom plate 26 of the cargo bed 2 and the chassis frame 1. More specifically, on the upper surface of the pair of chassis frames 1, the width equal to the frame upper surface width, the length equivalent to the length of the cargo bed 2 in the vehicle front-rear direction, and the weight increase exceeding the empty load amount of the cargo bed 2 A belt-like rubber elastic body 6 having a thickness with an elastic deformation margin (for example, an initial thickness of about 25 mm under no load) is fixed.
The rubber elastic body 6 may be fixed by fixing the belt-like rubber elastic body 6 having a length equivalent to the length of the loading platform 2. Further, the belt-like rubber elastic body 6 divided into the set lengths may be fixed within the length range of the loading platform 2. Furthermore, the belt-like rubber elastic bodies 6 divided into the set lengths may be fixed to the length range of the loading platform 2 through a space in the vehicle longitudinal direction.

  As shown in FIGS. 4 and 5, in the displacement restricting connection structure A2, when the gap dimension between the loading platform 2 and the chassis frame 1 due to the empty deformation of the rubber elastic body 6 is set as the reference interval ts, the reference interval ts is enlarged. The load-side bracket 7 and the frame-side bracket 8 are fastened with bolts 9 and lock nuts 10 so as to allow relative displacement in the direction in which the reference interval ts is reduced while restricting the relative displacement in the direction.

  As shown in FIG. 2, a plurality of pairs (for example, 26 in 13 pairs) of the loading platform side bracket 7 are fixed to the bottom plate 26 of the loading platform 2 by welding. As shown in FIGS. 4 and 5, the loading platform side bracket 7 is formed by integrally welding a loading platform side vertical plate 7 c to two triangular reinforcing plates 7 a and 7 b made of high-tensile steel plates. Further, a bolt long hole 7d having a longitudinal length for restricting / allowing relative displacement in the vehicle vertical direction and a fastening work notch 7e for securing a fastening workability for inserting the bolt 9 are provided on the loading platform side vertical plate 7c. Are provided.

  The frame side bracket 8 is welded and fixed at a position corresponding to the loading platform side bracket 7 of the chassis frame 1 made of I-shaped steel. As shown in FIG. 4, the frame side bracket 8 is made of a U-shaped high-tensile steel plate having a welded vertical plate portion 8a, a welded horizontal plate portion 8b, and a frame side vertical plate portion 8c. The frame-side vertical plate portion 8c is provided with a circular bolt hole 8d through which the bolt 9 is inserted.

  The bolt 9 is inserted with a washer 11 through the bolt hole 8d and the bolt long hole 7d. The lock nut 10 has a function of preventing loosening against vibration input in a screwed state, and is attached with a washer 12 to be screwed and fastened to the end of the bolt 9 from the outside. When the lock nut 10 is fastened, a contact surface pressure that restricts the relative displacement of the brackets 7 and 8 other than the vertical direction by surface contact while allowing the relative displacement of the brackets 7 and 8 in the vertical direction is allowed. Properly manage the nut tightening torque to maintain.

Next, the operation will be described.
The operation in the platform mounting structure A of the semi-trailer truck according to the first embodiment is divided into [an operation for improving the platform durability], [an operation for ensuring the stability of the platform connection], and [an operation for reducing the platform weight and increasing the load capacity]. I will explain.

[Improvement of loading platform durability]
In the case of trucks that frequently load and unload cargo, it is necessary to extend the life of the cargo bed as much as possible because the trailer including the cargo bed and the entire truck must be replaced and replaced if the cargo bed reaches the end of its life due to deformation or damage. It is. Hereinafter, the effect of improving the platform durability reflecting this will be described.

  Comparative Example 1 is a rigid support / connecting structure in which the loading platform and chassis frame are fastened or welded together. In the case of this comparative example 1, although the loading platform connection stability is ensured so that the lateral shaking of the loading platform with respect to the chassis frame is reliably suppressed, there is no function of attenuating the input applied to the loading platform. For this reason, for example, when a heavy load is dropped on the loading platform, the characteristics of the impact force received by the loading platform show the broken line characteristics of FIG. 6, the peak value of the impact force exceeds the strength limit of the loading platform, and the loading platform is permanently deformed. Or damage.

On the other hand, in Example 1, the platform 2 is elastically supported by the chassis frame 1 in the platform elastic support structure A1. In addition, the displacement restricting connection structure A2 employs a configuration that allows relative displacement in the vehicle vertical direction among the relative displacements caused by the elastic support of the loading platform 2 and the chassis frame 1.
For example, when a heavy load is dropped on the loading platform 2, the impact force is received by the deformation of the rubber elastic body 6, and the characteristics of the impact force received by the loading platform 2 are as shown by the solid line characteristics in FIG. The peak value is suppressed below the intensity limit. That is, an excessive input attenuation function that suppresses the peak value of the impact force received by the loading platform 2 is exhibited.
Therefore, when a heavy load is dropped onto the loading platform 2, deformation or damage of the loading platform 2 due to excessive input is prevented, loading platform durability is improved, and the life of the loading platform 2 is extended.

Further, in the first embodiment, the rubber elastic body 6 is fixed to a surface of the upper surface of the pair of chassis frames 1 and 1 facing the bottom plate 26 of the loading platform 2. The rubber elastic body 6 has a width equivalent to the width of the upper surface of the frame, a length equivalent to the length of the loading platform 2 in the vehicle front-rear direction, and a thickness with an elastic deformation margin for an increase in weight exceeding the empty load of the loading platform 2. And the structure which makes it a belt-like body with was adopted.
As described above, the rubber elastic body 6 having a high displacement absorption capacity ensures an elastic deformation following the relative displacement regardless of the magnitude of the relative displacement and the direction of the force. For example, even when an excessive impact input is applied stepwise from the outside to the loading platform 2 during the loading / unloading operation, the impact input is attenuated by the elastic deformation of the rubber elastic body 6. Further, even if there is a vibration input whose relative displacement direction fluctuates from the tire during traveling, this vibration input is attenuated by the elastic deformation of the rubber elastic body 6.
Therefore, during the input operation to the loading platform 2, the loading platform 2 is elastically supported while maintaining the damping function regardless of the input size and the input mode, and the improvement of the loading platform durability is ensured.

[Ensuring stability of loading platform connection]
During traveling, if the loading platform swings with respect to the chassis frame, the traveling behavior becomes unstable. In other words, in order to avoid unstable running behavior, it is necessary to suppress the lateral swing of the loading platform with respect to the chassis frame. Hereinafter, the securing operation of the platform connection stability reflecting this will be described.

  Comparative Example 2 is one in which the loading platform and the chassis frame are elastically supported / connected through rubber elastic bodies or the like. In the case of this comparative example 2, although the load carrier durability is ensured by the damping function of the rubber elastic body or the like, the lateral swing of the load carrier becomes large with respect to the chassis frame, and the load carrier connection stability cannot be ensured. For example, when turning in a loaded state, as shown by the arrow R in FIG. 7, the lateral movement of the load is added to the roll behavior due to the displacement of the suspension with the lateral movement of the loading platform with respect to the chassis frame (arrow G in FIG. 7). Becomes larger and unstable turning.

On the other hand, in the first embodiment, in the displacement restricting connection structure A2, among the relative displacements caused by the elastic support of the loading platform 2 and the chassis frame 1, the loading platform 2 and the chassis frame 1 are connected while regulating the relative displacement other than the vehicle vertical direction. The structure which mutually connects is adopted.
Due to this configuration, as shown by an arrow H in FIG. 7, during the turning operation, the platform sway suppressing function that suppresses the lateral sway of the platform 2 with respect to the chassis frame 1 by the surface contact of both brackets 7, 8 is exhibited. It is possible to prevent the loading platform 2 from swinging in the roll direction with respect to the frame 1 (arrow G in FIG. 7).
Therefore, when the vehicle is turning, the loading platform connection stability is secured such that the loading platform 2 is coupled to the chassis frame 1 in a stable posture while suppressing lateral swing in the roll direction.

Further, in the first embodiment, when the gap dimension between the loading platform 2 and the chassis frame 1 due to the unload deformation of the rubber elastic body 6 is set as the reference interval ts, the relative displacement in the direction in which the reference interval ts is reduced by the bolt long hole 7d. A configuration was adopted that allowed relative displacement in the direction in which the reference interval ts is increased while allowing.
For example, when the rear wheel 3 rides on a road surface projection when traveling on a rough road, the loading platform 2 is pushed up by the input from the rear wheel 3, and the gap between the loading platform 2 and the chassis frame 1 tries to be larger than the reference interval ts. To do. However, the relative displacement in the direction in which the reference interval ts expands (= bound direction) is restricted by the bolt long hole 7d, so that the loading platform 2 is held at a position that maintains the reference interval ts. Further, by controlling the displacement regulating connection structure A2 on the front side of the vehicle, the displacement regulating connection structure A2 on the rear side of the vehicle, and the relative displacement in the bound direction, the swing of the platform 2 in the pitch direction is also suppressed. Will be.
Therefore, when traveling on a rough road or the like, the loading platform connection stability is secured such that the loading platform 2 is coupled to the chassis frame 1 in a stable posture in which the shaking in the bound direction and the shaking in the pitch direction are suppressed.

[Reduction in weight of loading platform and expansion of cargo capacity]
For truck beds, there is a request to reduce the weight of the load carrier in order to improve fuel consumption, and there is also a request to increase the load capacity in order to improve workability for loading and unloading cargo. Hereinafter, the effect of reducing the weight of the loading platform and expanding the cargo capacity will be described.

  First, when the design strength of the loading platform is determined in consideration of the durability of the loading platform, the vertical stay, vertical joists, horizontal joists, etc. are used for the plate frame structure that is the basic shape of the loading platform so as to achieve the determined design strength. The cargo bed structure with the reinforcing parts is decided automatically. That is, when the design strength of the loading platform is high, there is a limit due to the addition of the weight of the reinforcing component even if the weight of the loading platform is reduced, and there is a limitation due to the space occupation by the reinforcing component even if the load capacity is increased.

  On the other hand, in the case of the first embodiment, even if the strength limit indicated by the solid line in FIG. 6, which is conventionally set as the design strength, is reduced as indicated by the one-dot chain line, the deformation of the loading platform 2 can be suppressed. In other words, the design strength of the loading platform can be reduced even when loading platform durability is taken into consideration, and as a result, vertical stays, vertical joists, horizontal joists, etc. that have been conventionally used as reinforcing parts are minimized. Will be able to.

Accordingly, as shown in FIG. 2, the loading platform 2 of the first embodiment omits a plurality of vertical stays provided to reinforce the left and right side plates 21, 22, and is provided in a cross-beam shape to reinforce the bottom plate 26. The configuration that omits the vertical and horizontal joists is adopted.
By omitting the reinforcing parts (vertical stays, vertical joists, horizontal joists), the weight increase due to the reinforcing parts is reduced, and the weight of the loading platform is significantly reduced.

  In addition, by omitting the reinforcing parts (vertical stays, vertical joists, horizontal joists), the restriction of the load capacity by these reinforcing parts is released, and the load capacity can be greatly increased. In particular, in the case of Example 1, the outer peripheral plate surfaces of the flat plate portions 21b and 22b are made to coincide with the outer peripheral frame surface of the upper end frame 25 as shown by the outer line OL parallel to the center line CL in FIG. As a result, the cargo capacity has been increased by about 10% compared to the conventional loading platform (dashed line in Fig. 3) with vertical stays and joists.

Next, the effect will be described.
In the platform mounting structure A of the semi-trailer truck according to the first embodiment, the effects listed below can be obtained.

(1) In the loading platform mounting structure A of a truck (semi-trailer truck) that mounts a loading platform 2 on the upper surface of a pair of chassis frames 1 that extend in the vehicle longitudinal direction of the truck,
A carrier elastic support structure A1 which is set between the carrier 2 and the chassis frame 1 and elastically supports the carrier 2 with respect to the chassis frame 1;
A relative displacement that is set in parallel with the support elastic structure A1 and that is caused by the elastic support of the load carrier 2 and the chassis frame 1 is restricted while permitting a relative displacement in the vehicle vertical direction and other than the vehicle vertical direction. A displacement restricting connection structure A2 for connecting the carrier 2 and the chassis frame 1 to each other;
Is provided.
In this way, the displacement regulation connecting structure A2 arranged in parallel with the platform elastic support structure A1 is configured to adjust the excessive input damping function and the platform swing restraint function, so that the platform platform durability can be improved and the platform life span can be extended. It is possible to achieve both the securement of the loading platform connection stability that suppresses the swinging of the loading platform.

(2) The cargo bed elastic support structure A1 is configured by fixing a rubber elastic body 6 to a surface of the upper surface of the pair of chassis frames 1 and 1 facing the bottom plate 26 of the cargo bed 2,
The rubber elastic body 6 has an elastic deformation margin with respect to an increase in weight exceeding the width of the upper surface of the frame, a length equivalent to the length of the cargo bed 2 in the longitudinal direction of the vehicle, and an excess load of the cargo bed 2. A belt-like body having a thickness was obtained.
As described above, since the rubber elastic body 6 elastically deforms following the magnitude and direction of the relative displacement force is elastically supported, in addition to the effect (1), the magnitude of the input during the input operation to the loading platform 2 Regardless of the input mode, the loading platform 2 is elastically supported while maintaining the damping function, and it is possible to ensure improved loading platform durability.

(3) The displacement restricting connection structure A2 includes a loading platform side bracket 7 fixed to the bottom plate 26 of the loading platform 2 and a frame side fixed to the position of the chassis frame 1 corresponding to the fixed position of the loading platform side bracket 7. Bracket 8, bolt long hole 7d provided in at least one of loading platform side bracket 7 and frame side bracket 8 and having a longitudinal length allowing relative displacement in the vehicle vertical direction, loading platform side bracket 7 and The frame side bracket 8 includes a bolt 9 and a lock nut 10 that are fastened while allowing relative displacement in the vehicle vertical direction.
In this way, since the displacement restricting connection structure A2 is constituted by the two brackets 7 and 8 and the bolts and nuts 9 and 10, in addition to the effect of (1) or (2), while having a simple structure with a small number of parts, It is possible to secure the platform connection stability of suppressing the swing of the platform 2 while allowing the relative displacement in the vehicle vertical direction.

(4) When the bolt long hole 7d is defined as a reference interval ts that is a gap dimension between the loading platform 2 and the chassis frame 1 due to deformation of the rubber elastic body 6 in an unloaded state, a relative displacement in a direction in which the reference interval ts is reduced. While being allowed, the holes were set to restrict relative displacement in the direction in which the reference interval ts was increased.
As described above, since the relative displacement in the bounce direction in which the reference interval ts increases among the relative displacements in the vehicle vertical direction is restricted, in addition to the effect of (3), the chassis frame 1 can be used when traveling on a rough road. On the other hand, it is possible to ensure the loading platform connection stability in which the loading platform 2 is coupled in a stable posture in which the deflection in the bound direction and the deflection in the pitch direction are suppressed.

(5) The loading platform 2 is made of a high-tensile steel plate, the left and right side plates 21 and 22, the front plate 23, the rear plate 24, the upper end frame 25 surrounding these upper ends in a square shape, and the bottom plate 26 And the vertical stays that reinforce the left and right side plates 21 and 22 are omitted, and the vertical joists and horizontal joists that reinforce the bottom plate 26 are omitted, so that the upper portion is open.
In this way, the vertical stays, vertical joists and horizontal joists are omitted, and the number of reinforcing parts is minimized.In addition to the effects (1) to (4), the weight increase due to the reinforcing parts is reduced, and the weight of the loading platform is reduced. Can be significantly reduced in weight.

(6) The left and right side plates 21 and 22 of the cargo bed 2 are inclined from the inclined plate portions 21a and 22a inclined outward from the inner surface of the upper end frame 25 toward the outer surface, and the bent lower ends of the inclined plate portions 21a and 22a. The flat plate portions 21b and 22b extending vertically downward, and the curved plate portions 21c and 22c formed at the portion where the flat plate portions 21b and 22b and the bottom plate 26 by the flat plate cross each other, are used.
In this way, because the plate frame of the loading platform 2 is expanded outward to the setting position of the reinforcing parts, in addition to the effect of (5), the restriction of the loading capacity by the reinforcing parts is released, and the loading capacity is greatly expanded. Can be planned.

  The truck bed mounting structure of the truck according to the present invention has been described based on the first embodiment. However, the specific configuration is not limited to the first embodiment, and the claims relate to each claim. Design changes and additions are allowed without departing from the scope of the invention.

  In Example 1, the example which uses the rubber elastic body 6 as the carrier elastic support structure A1 was shown. However, as the platform elastic support structure A1, in addition to the rubber elastic body, an example of a composite elastic body in which a spring is incorporated in the rubber elastic body, an example of using a rubber elastic body and a spring together, or the like may be used.

  In the first embodiment, an example in which the displacement regulation connecting structure A2 is configured by the loading platform side bracket 7, the frame side bracket 8, the bolt 9, and the lock nut 10 is shown. However, the displacement regulation connecting structure A2 may be an example in which the loading platform side bracket and the frame side bracket are connected by a connecting member other than the bolt and nut. In short, among the relative displacements caused by the elastic support between the cargo bed and the chassis frame 1, the structure allows the cargo bed and the chassis frame to be connected to each other while allowing the relative displacement in the vehicle vertical direction and restricting the relative displacement other than in the vehicle vertical direction. It ’s fine.

  In the first embodiment, an example in which the loading platform mounting structure of the present invention is applied to the loading platform of a trailer of a semi-trailer truck is shown. However, the loading platform mounting structure of the present invention can be applied to various types such as general cargo trucks and full trailer trucks as long as the loading platform is mounted on the upper surface of a pair of chassis frames that extend in the longitudinal direction of the vehicle. It can be applied to various types and types of tracks.

DESCRIPTION OF SYMBOLS 1 Chassis frame 2 Cargo bed 21 Left side board 21a Inclined board part 21b Plane board part 21c Curved board part 22 Right side board 22a Inclined board part 22b Plane board part 22c Curved plate part 23 Front board 24 Rear panel 25 Upper board 26 Bottom board A Cargo body mounting Construction
A1 Elastic support structure for loading platform
A2 Displacement restricting connection structure 6 Rubber elastic body 7 Carrier side bracket 7d Bolt long hole 8 Frame side bracket 8d Bolt hole 9 Bolt 10 Lock nut
ts reference interval

Claims (6)

In the truck bed mounting structure in which the truck bed is mounted on the upper surface of the chassis frame that extends in the vehicle longitudinal direction of the truck and is arranged in a pair,
A load carrier elastic support structure which is set between the load carrier and the chassis frame and elastically supports the load carrier with respect to the chassis frame;
Among the relative displacements that are set in parallel with the platform elastic support structure and are caused by the elastic support of the platform and the chassis frame, while allowing relative displacement in the vehicle vertical direction, while restricting relative displacement other than in the vehicle vertical direction, A displacement regulation connecting structure for connecting the loading platform and the chassis frame to each other;
A truck bed mounting structure characterized by comprising: In the truck bed structure according to claim 1,
The cargo bed elastic support structure is configured by fixing a rubber elastic body to a surface of the upper surface of the pair of chassis frames that faces the bottom surface of the cargo bed,
The rubber elastic body has a width equivalent to the frame upper surface width, a length equivalent to the length of the cargo bed in the vehicle front-rear direction, and a thickness with an elastic deformation margin with respect to a weight increase exceeding the empty load amount of the cargo bed, A truck bed structure that is characterized by a belt-like body. In the truck bed mounting structure according to claim 1 or 2,
The displacement regulation connecting structure includes: a loading platform side bracket fixed to a bottom surface of the loading platform; a frame side bracket fixed to a position of the chassis frame corresponding to a fixed position of the loading platform side bracket; the loading platform side bracket; A bolt slot provided in at least one of the frame side brackets and having a longitudinal length allowing relative displacement in the vehicle vertical direction, and allowing the load platform side bracket and the frame side bracket to be relatively displaced in the vehicle vertical direction. A truck bed mounting structure comprising a bolt and a lock nut to be fastened. In the truck bed structure according to claim 3,
When the bolt long hole is defined as a gap between the cargo bed and the chassis frame due to the deformation of the rubber elastic body, the reference gap increases while allowing relative displacement in the direction in which the reference gap decreases. A truck bed structure that is set in a hole that regulates the relative displacement in the direction. In the truck bed mounting structure according to any one of claims 1 to 4,
The loading platform is made of a high-tensile steel plate, has left and right side plates, a front plate, a rear plate, an upper end frame that surrounds these upper ends in a square shape, and a bottom plate, and reinforces the left and right side plates. A truck bed mounting structure characterized by having a box shape with an open top by omitting vertical stays and horizontal joists that reinforce the bottom plate. In the truck bed structure according to claim 5,
Inclined plate portions that incline outwardly from the inner surface of the upper end frame toward the outer surface, the flat plate portions that extend vertically downward from the bent lower end of the inclined plate portion, and the flat plate portions. And a curved plate portion formed at a portion where the flat plate intersects with the bottom plate.