JP2022128966A - Tank lorry - Google Patents

Abstract

To provide a tank lorry which can inhibit fatigue of a storage box.SOLUTION: A tank lorry 10 includes: a pair of left and right side members 11, 12 extending in a fore and aft direction of a vehicle; a cross member 13 connecting the pair of side members 11, 12; a rear bumper 20 which spans a space between rear ends of the pair of side members 11, 12; a tank 14 mounted on the side members 11, 12 at a position spaced apart from the rear bumper 20 in a forward direction; and a storage box 16 disposed in a portion located rearward of the tank 14 and surrounded by the pair of side members 11, 12, the cross member 13, and the rear bumper 20. The storage box 16 is supported in a cantilever manner by one of the side members 11, 12, the cross member 13, and the rear bumper 20, and thus fatigue of the storage box 16 can be inhibited.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a tank truck capable of suppressing fatigue of a containment box.

A storage box for storing various tools, tire chains, jacks, etc. is arranged in the tank truck behind the tank and in front of the rear bumper that spans the rear ends of the pair of left and right side members. There is In the tank truck disclosed in Patent Document 1, a storage box is laid over a pair of left and right side members.

Japanese Utility Model Laid-Open No. 63-105544

However, in the technique disclosed in Patent Document 1, when the side member bends or the angle between the side member and the rear bumper changes, the storage box is easily deformed and stored. There is a problem that fatigue easily occurs in the box.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tank truck capable of suppressing fatigue of a storage box.

In order to achieve this object, the tank truck of the present invention comprises a pair of left and right side members extending in the longitudinal direction of the vehicle, a cross member connecting the pair of side members, and a rear end of the pair of side members. A rear bumper, a tank mounted on the side members at a position spaced forward from the rear bumper, and a portion behind the tank and surrounded by the pair of side members, the cross member, and the rear bumper. and a storage box which is supported by one member of the side member, the cross member and the rear bumper in a cantilever manner.

According to the tank truck of claim 1, the storage box is cantilever supported by one of the side member, the cross member and the rear bumper. Therefore, even if the side member bends or the angle between the side member and the rear bumper changes, the cantilever-supported storage box is less likely to deform. As a result, fatigue of the containment box can be suppressed.

According to the tank truck of claim 2, the side member, the cross member or the rear bumper (member 1) for cantilevering the storage box has a pair of flanges extending from the upper and lower ends of the web toward the inside of the vehicle. It is provided with a pair of upper and lower attachment portions each having a body portion formed in a U-shaped cross section, a facing surface portion facing the web, and a fixing surface portion attached to the flange. The storage box is supported via a supporting portion that spans the opposing surface portions of the pair of upper and lower mounting portions. As a result, the supporting portion, the opposing surface portions of the pair of upper and lower mounting portions, and the main body portion form a portion having a substantially rectangular cross section. Furthermore, the use of the pair of upper and lower mounting portions is more advantageous than the case where a single member having a substantially U-shaped cross section is joined to the main body to form a portion having a substantially rectangular cross section instead of the pair of upper and lower mounting portions. Manufacturing errors of members can be easily absorbed.

According to the tank truck of claim 3, the first portion of the reinforcing portion is a plate-like portion that overlaps the opposing surface portion and connects the pair of upper and lower mounting portions. As a result, the first portion of the reinforcing portion, the pair of upper and lower mounting portions, and the body portion form a portion having a substantially rectangular cross section, thereby improving the rigidity. Further, the reinforcing portion has a plate-shaped second portion extending vertically from the first portion. Since the second portion functions as a reinforcing rib for the first portion, the rigidity of the substantially rectangular cross-sectional portion formed by the first portion, the mounting portion, and the main body portion is further improved. As a result, in addition to the effects of claim 2, the durability of the first member can be further improved.

According to the tank truck of claim 4, the second portion is joined to the member to which one of the side member, the cross member and the rear bumper is connected. Thereby, in addition to the effect of claim 3, the connecting portion of two members out of the side member, cross member, or rear bumper can be reinforced by the reinforcing portion.

It is a rear perspective view showing the rear portion of the tank truck in one embodiment. Fig. 2 is a front perspective view showing the rear portion of the tank truck with the tank and storage box removed; FIG. 2 is a partial cross-sectional view of the tank truck taken along line III-III of FIG. 1; 4 is a partial cross-sectional view of the tank truck taken along line IV-IV of FIG. 3; FIG.

Preferred embodiments will now be described with reference to the accompanying drawings. First, an outline of a tank truck 10 in one embodiment will be described with reference to FIG. FIG. 1 is a rear perspective view showing the rear portion of the tank truck.

As shown in FIG. 1, the tank truck 10 includes a pair of left and right side members 11 and 12 extending in the longitudinal direction of the vehicle, and a cross member 13 connecting the pair of side members 11 and 12 at a plurality of locations in the longitudinal direction of the vehicle. , a rear bumper 20 bridged over the rear ends of the pair of side members 11, 12; a tank 14 loaded on the side members 11, 12; and a storage box 16.

The side members 11 and 12 are metal members having a substantially U-shaped cross section that open toward each other (inwardly in the left-right direction of the vehicle). A side member 11 is on the left side of the vehicle, and a side member 12 is on the right side.

The cross member 13 is a metal member whose both ends are welded to the side members 11 and 12 and extends in the lateral direction of the vehicle. The cross member 13 in this embodiment is provided with a plurality of lightening holes and is lightened to the limit where the rigidity of the vehicle body can be maintained.

The tank 14 is a container for storing liquid, powder, gas, etc., and is formed by closing both ends of a cylindrical portion with dome-shaped lids. A pair of left and right sub-frames 15 attached to the lower portion of the tank 14 are fixed onto the side members 11 and 12, respectively.

The rear bumper 20 is a metal member that spans the side members 11 and 12 and extends from the side members 11 and 12 to both sides in the left-right direction of the vehicle, and forms the vehicle rear end of the tank truck 10 . The rear end of the tank 14 is separated forward from the rear bumper 20 so that the tank 14 is not deformed when another vehicle collides with the rear bumper 20 which is the rear end of the vehicle.

The storage box 16 is a box-shaped container that can store various tools, tire chains, jacks, and the like, and the stored items are taken in and out by opening and closing the lid on the upper surface. Storage box 16 is arranged in a portion surrounded by a pair of side members 11 and 12 , rearmost cross member 13 and rear bumper 20 . Since the storage box 16 is positioned behind the tank 14, the storage box 16 can be accessed from above without interfering with the tank 14, even in a portion surrounded by the side members 11, 12 and the like. That is, the contents can be taken in and out by opening and closing the lid on the upper surface of the storage box 16 without interfering with the tank 14.例文帳に追加It should be noted that the position of the storage box 16 behind the tank 14 means that it is at least behind the rear end of the cylindrical portion of the tank 14 .

Next, with reference to FIGS. 2 to 4, the detailed configuration of the rear bumper 20, the support portion 40 for supporting the storage box 16, and the like will be described. FIG. 2 is a front perspective view of the rear portion of the tank truck 10 with the tank 14 and storage box 16 (see FIG. 1) removed. FIG. 3 is a partial cross-sectional view of the tank truck 10 taken along line III-III of FIG. FIG. 4 is a partial cross-sectional view of the tank truck 10 taken along line IV-IV of FIG.

As shown in FIGS. 2 and 3, the rear bumper 20 includes a bumper main body (main body portion) 21 having a substantially U-shaped cross section with the opening side facing forward, and a pair of left and right welded parts projecting forward from the bumper main body 21. It has surface portions 25 and 26 and L-shaped mounting portions 28 and 29 fixed to the bumper main body 21 between the pair of welding surface portions 25 and 26 .

The bumper body 21 includes a plate-shaped web 22 extending in the lateral direction of the vehicle with the longitudinal direction of the vehicle as the plate thickness direction, and a pair of upper and lower flanges 23 and 24 extending from the upper and lower ends of the web 22 toward the front of the vehicle. , is equipped with A flange 23 is provided on the upper side of web 22 and a flange 24 is provided on the lower side of web 22 . The web 22 and the flanges 23, 24 are integrally formed to be connected substantially perpendicularly.

The welded surface portions 25 and 26 are plate-like portions projecting from the web 22 to the front of the flange 23, and overlapped with the outer surfaces of the pair of side members 11 and 12 (outer surfaces in the left-right direction of the vehicle). Welding surface portions 25 and 26 are welded to web 22 and flange 23 substantially perpendicularly. The welded portions 27 between the welded surfaces 25 and 26 and the web 22 and the flanges 23 are schematically shown in FIGS. 2 to 4, but the position and shape of the welded portions 27 are not limited to those shown in FIGS. .

As shown in FIGS. 2 to 4, the mounting portion 28 includes a plate-shaped fixing surface portion 28a that is fixed to the lower surface of the flange 23, and a front end of the fixing surface portion 28a that protrudes substantially vertically downward to face the web 22. and a plate-shaped facing surface portion 28b which is formed in an L shape when viewed from the left-right direction of the vehicle. The mounting portion 29 includes a plate-like fixing surface portion 29a that is fixed on the upper surface of the flange 24, and a plate-like facing surface portion 29b that extends substantially vertically upward from the front end of the fixing surface portion 29a and faces the web 22. It is formed in an L shape when viewed from the lateral direction of the vehicle.

A pair of upper and lower mounting portions 28 and 29 are arranged in the vicinity of the welding surface portion 25 and in the vicinity of the welding surface portion 26, respectively. The fixing surface portions 28a and 29a are mechanically joined to the flanges 23 and 24 at a plurality of locations (two locations in this embodiment) separated in the lateral direction of the vehicle by bolts and nuts. The front surfaces of the opposing surface portions 28b and 29b are located forward of the front ends of the flanges 23 and 24. As shown in FIG.

The facing surface portions 28 b and 29 b of the pair of upper and lower mounting portions 28 and 29 separated from each other are connected by a reinforcing portion 30 . The reinforcing portions 30 are metal members for reinforcing joints between the rear bumper 20 and the side members 11 and 12, and are arranged on both sides in the left-right direction of the vehicle. When the rear bumper 20 is swung in the left-right direction of the vehicle, the angle between the rear bumper 20 and the side members 11 and 12 tends to change, and a load is applied to joints between the two.

The reinforcing portion 30 includes a plate-like first portion 31 that overlaps the opposing surface portions 28b and 29b and connects the pair of upper and lower mounting portions 28 and 29, and a plate-like portion that extends vertically from the first portion 31 and extends in the vertical direction. and a plurality of ribs 33 rising substantially vertically from the second portion 32 and the first portion 31 . The first portion 31 protrudes from the rear end of the second portion 32 inward in the left-right direction of the vehicle substantially vertically. The second portion 32 overlaps the inner surfaces of the side members 11 and 12 (inside surfaces in the left-right direction of the vehicle) so as to sandwich the side members 11 and 12 between the second portions 32 and the weld surface portions 25 and 26 .

The second portion 32 of the reinforcing portion 30 is mechanically joined to the side members 11 and 12 by bolts and nuts passing through overlapping portions of the second portion 32, the side members 11 and 12, and the welded surface portions 25 and 26. . The first portion 31 is laid over the front surfaces of the opposing surface portions 28b and 29b. The first portion 31 of the reinforcing portion 30 is mechanically joined to the mounting portions 28 and 29 of the rear bumper 20 by bolts and nuts passing through the overlapping portions of the first portion 31 and the opposing surface portions 28b and 29b. .

The reinforcing portion 30 mechanically joined to the welded surface portions 25 and 26 of the rear bumper 20 and the rear bumper 20 in this way prevents stress concentration from occurring at the welded portion 27 between the welded surface portions 25 and 26 and the web 22 and the flange 23. It is possible to suppress the deformation, and to reinforce the connecting portion between the bumper main body 21 and the side members 11 and 12 via the welded surface portions 25 and 26 . Furthermore, since the side members 11, 12 and the welded surfaces 25, 26 are also mechanically bonded at the same time as the welded surfaces 25, 26 and the reinforcing portion 30 are mechanically bonded, stress concentration occurs at the welded portion 27. can be suppressed.

In addition, since the rib 33 makes it difficult to change the angle between the second portion 32 and the first portion 31, it is possible to make it difficult to change the angle between the side members 11, 12 to which they are fixed and the rear bumper 20. Therefore, stress concentration in the welded portion 27 due to the ribs 33 can be further suppressed.

Since the first portion 31 of the reinforcing portion 30, the mounting portions 28 and 29, and the bumper main body 21 are joined together so as to have a substantially rectangular cross section (square tubular shape), rigidity is improved. Furthermore, since the second portion 32 and the ribs 33 of the reinforcing portion 30 rise vertically from the first portion 31 and function as reinforcing ribs, the first portion 31, the mounting portions 28 and 29, and the bumper main body 21 form a substantially rectangular cross-section. The rigidity of the part is further improved. As a result, the durability of the rear bumper 20 that supports the storage box 16 can be improved, and stress concentration at the welded portion 27 can be further suppressed.

Instead of the mounting portions 28 and 29 and the first portion 31, a single member having a substantially U-shaped cross section may be joined to the bumper main body 21 to form a portion having a substantially rectangular cross section. In this case, there is an advantage that the mounting work can be simplified. On the other hand, joining the mounting portions 28 and 29 and the first portion 31 has the advantage of easily absorbing manufacturing errors of the rear bumper 20 .

In addition to the reinforcing portion 30 , metal support portions 40 are attached to the opposing surface portions 28 b and 29 b of the mounting portions 28 and 29 of the rear bumper 20 so as to vertically connect the mounting portions 28 and 29 . By connecting the connecting portion 41 of the support portion 40 (to be described later) to the mounting portions 28 and 29 and joining them together, the connecting portion 41, the mounting portions 28 and 29, and the bumper main body 21 form a substantially rectangular cross-section in the same manner as the first portion 31. can form part of Thereby, the rigidity in the vicinity of the reinforcing portion 30 can be further improved. As a result, the durability of the rear bumper 20 that supports the storage box 16 can be improved, and stress concentration at the welded portion 27 can be further suppressed.

The support portion 40 is a member for cantilevering the storage box 16 on the rear bumper 20 . The support portion 40 includes a connecting portion 41 that vertically connects the opposing surface portions 28b and 29b of the mounting portions 28 and 29, a rectangular frame portion 42 that continues to the lower end of the connecting portion 41 and supports the lower surface of the storage box 16, and a rectangular frame. A reinforcing rod 43 for connecting the front end of the portion 42 and the upper end of the connecting portion 41 to ensure the rigidity of the support portion 40 is provided. The square frame portion 42 is formed by framing an angle steel into a substantially rectangular shape.

The connecting portion 41 is an L-shaped portion that extends vertically along the rear corner of the storage box 16, and is mechanically connected to the opposing surface portions 28b and 29b provided near the side members 11 and 12 by bolts and nuts. are joined together. The storage box 16 is fastened and fixed to the square frame portion 42 using screw holes formed in the square frame portion 42 .

According to the tank truck 10 described above, the storage box 16 arranged in the portion surrounded by the pair of side members 11 and 12, the cross member 13, and the rear bumper 20 is cantilever-supported by the rear bumper 20 via the support portion 40. there is As a result, even if the side members 11 and 12 are bent or the angle between the side members 11 and 12 and the rear bumper 20 is changed, the storage box 16 is kept between the side members 11 and 12. The cantilevered storage box 16 can be made less deformable than when it is bridged. As a result, fatigue of the storage box 16 can be suppressed.

Furthermore, since the storage box 16 is cantilevered by the rear bumper 20, compared to the case where the storage box 16 is cantilevered by either the left or right side members 11, 12, the inertial force of the storage box 16, etc., affects each part. It is possible to reduce the left-right difference in load. In addition, in the tank truck 10, equipment other than the storage box 16 may be attached to the outside of the pair of side members 11 and 12, and it is easier to attach the storage box 16 to the rear bumper 20 so that the storage box 16 cantilevered. It is easy to secure the mounting position of the box 16. - 特許庁

Since the storage box 16 positioned behind the tank 14 is supported by the rear bumper 20 positioned behind the tank 14, compared to the case where the storage box 16 is supported by the cross member 13 which is not necessarily positioned behind the tank 14, The distance from the part to be supported to the storage box 16 can be surely shortened. As a result, the moment applied to the cantilevered storage box 16 can be easily reduced, and the required strength of the support portion 40 supporting the storage box 16 can be reduced.

Further, the cross member 13 in this embodiment is lightened to the limit where the rigidity of the vehicle body can be maintained. It is necessary to replace the cross member 13 with a high-strength cross member 13 . On the other hand, the rear bumper 20, which functions as a shock absorber at the time of collision and a protection device for the vehicle body, is designed with sufficient strength, so that the rear bumper 20 need not be reinforced or replaced with a high-strength product.

Even if it is possible to eliminate the need to reinforce the rear bumper 20 itself which supports the storage box 16 in a cantilever manner, it is preferable to reinforce the joints between the rear bumper 20 and the side members 11 and 12 with the reinforcing portion 30 as described above. This is because when the storage box 16 is swung in the left-right direction of the vehicle, the weight of the storage box 16 itself and the weight of its contents increase the inertial force acting on the rear bumper 20 that supports the storage box 16 in a cantilever manner. This is because stress concentration is likely to occur at the welded portion 27 between the surface portions 25 and 26 and the web 22 or the flange 23 . Even when the storage box 16 is cantilevered on the rear bumper 20 , the reinforcing portion 30 can suppress stress concentration on the welded portion 27 .

Although the present invention has been described above based on the above embodiments, the present invention is by no means limited to the above embodiments, and it is easily conjectured that various modifications and improvements are possible without departing from the scope of the present invention. It is possible. For example, the shape and dimensions of each part of the tank truck 10 may be changed as appropriate.

In the above embodiment, the case where bolts and nuts are used to mechanically join the respective parts has been described, but the present invention is not necessarily limited to this. Each part may be mechanically joined by screw joining, riveting, crimping, or shrink fitting.

In the above embodiment, the storage box 16 is cantilever-supported by the rear bumper 20 via the support portion 40, but the configuration is not necessarily limited to this. The storage box 16 may be directly supported by the rear bumper 20 by omitting the support portion 40 . Alternatively, the storage box 16 may be cantilevered by either the left or right side members 11 , 12 or the cross member 13 either directly or via the support portion 40 . Also in this case, compared with the case where the storage box 16 is bridged between the side members 11 and 12, the cantilevered storage box 16 can be hardly deformed, and the fatigue of the storage box 16 can be suppressed.

The side members 11 and 12 and the cross member 13 on which the storage box 16 is cantilevered are provided with a body portion having a substantially U-shaped cross section similar to the bumper body 21, and a pair of upper and lower body portions attached to the flanges 24 of the body portion. Mounting portions 28 and 29 may be provided. The mounting portions 28 and 29 provided on the side members 11 and 12 and the cross member 13 may be connected by the reinforcing portion 30 . Moreover, the side members 11 and 12 and the cross member 13 may be connected by the reinforcing portion 30 .

In the above embodiment, the bumper main body 21 having a substantially U-shaped cross section in which the web 22 and the flanges 23 and 24 are integrally formed has been described, but the bumper body 21 is not necessarily limited to this. The web 22 and the flanges 23 and 24 may be formed from separate steel plates and welded together to form the bumper body 21 having a substantially U-shaped cross section. Similarly, the mounting portions 28 and 29, the reinforcing portion 30, the connecting portion 41, and the like are not limited to being formed by bending steel plates, and these members may be formed by welding a plurality of steel plates.

REFERENCE SIGNS LIST 10 tank truck 11, 12 side member 13 cross member 14 tank 16 storage box 20 rear bumper 21 bumper main body (main body portion)
22 Web 23, 24 Flange 28, 29 Mounting portion 28a, 29a Fixing surface portion 28b, 29b Opposing surface portion 30 Reinforcing portion 31 First portion 32 Second portion 40 Supporting portion

Claims (4)

a pair of left and right side members extending in the longitudinal direction of the vehicle;
a cross member that connects the pair of side members;
a rear bumper spanning the rear ends of the pair of side members;
a tank mounted on the side member at a position spaced forward from the rear bumper;
a storage box arranged behind the tank and surrounded by the pair of side members, the cross member, and the rear bumper;
A tank truck, wherein the storage box is cantilever supported by one of the side member, the cross member and the rear bumper. The member of the above 1 is
a main body having a U-shaped cross section in which a pair of flanges extends from the upper and lower ends of the web toward the inside of the vehicle;
A pair of upper and lower mounting portions having a facing surface portion facing the web and a fixing surface portion attached to the flange,
2. The tank lorry according to claim 1, wherein said storage box is supported via a supporting portion that spans said opposing surface portions of said pair of upper and lower mounting portions. a reinforcing portion having a plate-like first portion that overlaps the facing surface portion and connects the pair of upper and lower mounting portions, and a plate-like second portion that extends vertically from the first portion and extends in the vertical direction; 3. A tank truck according to claim 2, comprising: 4. A tank truck according to claim 3, wherein said second portion is joined to one of said side member, said cross member and said rear bumper to which said one member is connected.

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