Vehicle and vehicle manufacturing method

Abstract

To provide a vehicle that facilitates work for adjusting a position of an upper plate with respect to a tank, and a vehicle manufacturing method.SOLUTION: An equipment chamber 100 comprises: a lower plate 110 which has a floor part 111 forming a floor, and side wall parts 112 arranged at both sides in a vehicle width direction of the floor part 111 to form a portion of a side wall; and an upper plate 120 which has a ceiling wall part 121 forming a ceiling wall and side wall parts 122 arranged at both sides in the vehicle width direction of the ceiling wall part 121 to form a position of the side wall. Since inside surfaces in the vehicle width direction of the side wall parts 122 are overlappingly welded to outside surfaces in the vehicle width direction of the side wall parts 112, a position (a height position and an inclination angle) of the upper plate 120 can be easily adjusted, by adjusting a margin of the overlapping. This facilitates work for adjusting the position of the upper plate 120 with respect to a tank 12.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a vehicle and a method for manufacturing a vehicle, and more particularly to a vehicle and a method for manufacturing a vehicle that facilitates the work of adjusting the position of an upper plate relative to a tank. [Background technology]

[0002] A tank truck equipped with an equipment room behind the tank is known (Patent Document 1). The equipment room is formed in a box shape with a floor, left and right side walls, a rear wall, and a ceiling wall that curves along the tank, and inside it are stored valves, instruments, piping, etc. for supplying and discharging cargo such as liquefied natural gas.

[0003] Here, the equipment room was equipped with a lower plate that formed the floor side and an upper plate that formed the side walls, rear wall, and ceiling wall side, and was structured so that the lower end of the upper plate was butted against the upper end of the part that stood upright from the edge of the lower plate (hereinafter referred to as the "upper end of the lower plate") and joined. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2015-030301 A (for example, paragraphs 0018, 0024, Figure 1, etc.) Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the structure in which the upper end of the lower plate and the lower end of the upper plate are butted together, as in the conventional technology described above, there was a problem in that it was time-consuming to adjust the position of the upper plate relative to the tank.

[0006] That is, if the height of the equipment room becomes larger than the diameter of the tank when the upper end of the lower plate and the lower end of the upper plate are butted together, it will be necessary to grind down the upper end of the lower plate (or the lower end of the upper plate) and adjust the position of the upper plate (height position, inclination angle). Conversely, if the height of the equipment room becomes smaller than the diameter of the tank when the upper end of the lower plate and the lower end of the upper plate are butted together, it will be necessary to insert a separate member between the upper end of the lower plate and the lower end of the upper plate and raise the height of the upper plate.

[0007] The present invention has been made to solve the above-mentioned problems, and aims to provide a vehicle and a method for manufacturing the vehicle that makes it easier to adjust the position of the upper plate relative to the tank. [Means for solving the problem]

[0008] In order to achieve this object, the vehicle of the present invention comprises a frame, a tank mounted on the frame, and an equipment room arranged on the rear side of the tank, the equipment room comprising a lower plate and an upper plate, the lower plate comprising a floor portion forming the floor, and lower plate side wall portions arranged on both sides of the floor in the vehicle width direction and forming part of the side walls, the upper plate comprising a ceiling wall portion forming a ceiling wall that curves along the tank, and upper plate side wall portions arranged on both sides of the ceiling wall in the vehicle width direction and forming part of the side walls, the inner or outer surface of the upper plate side wall portions in the vehicle width direction being overlapped and joined to the outer or inner surface of the lower plate side wall portions in the vehicle width direction.

[0009] The method for manufacturing a vehicle of the present invention is a method for manufacturing a vehicle comprising a frame, a tank mounted on the frame, and an equipment room arranged on the vehicle rear side of the tank, wherein the equipment room comprises a floor portion forming the floor, a lower plate having lower plate side wall portions arranged on both sides of the floor portion in the vehicle width direction and forming part of the side walls, a ceiling wall portion forming a ceiling wall that curves along the tank, and an upper plate having upper plate side wall portions arranged on both sides of the ceiling wall portion in the vehicle width direction and forming part of the side walls, and comprises a first step of mounting the tank on the frame, a second step of joining the floor portion of the lower plate to the frame on the vehicle rear side of the tank mounted in the first step, and a third step of overlapping and joining the vehicle width direction inner side or outer side of the upper plate side wall portion of the upper plate to the vehicle width direction outer side or inner side of the lower plate side wall portion of the lower plate, whose floor portion was joined to the frame in the second step. [Effects of the Invention]

[0010] According to the vehicle of claim 1, the equipment compartment includes a lower plate and an upper plate, the lower plate includes a floor portion forming the floor and lower plate sidewall portions disposed on both sides of the floor portion in the vehicle width direction and forming part of the side walls, the upper plate includes a ceiling wall portion forming the ceiling wall and upper plate sidewall portions disposed on both sides of the ceiling wall portion in the vehicle width direction and forming part of the side walls, and the inner or outer surface of the upper plate sidewall portions in the vehicle width direction is overlapped and joined to the outer or inner surface of the lower plate sidewall portions in the vehicle width direction, so that the position (height position, tilt angle) of the upper plate can be easily adjusted by adjusting the overlap without performing work to cut members or work to insert a separate member. As a result, the work to adjust the position of the upper plate relative to the tank can be easily performed.

[0011] According to the vehicle described in claim 2, in addition to the effects achieved by the vehicle described in claim 1, the area where the inner or outer surface of the upper plate side wall portion in the vehicle width direction and the outer or inner surface of the lower plate side wall portion in the vehicle width direction overlap is located below the center of the side wall of the equipment room in the vertical direction of the vehicle, thereby preventing welding work from becoming dangerous work at a height.

[0012] According to the vehicle described in claim 3, in addition to the effects achieved by the vehicle described in claim 1 or 2, the inner surface of the upper plate side wall portion in the vehicle width direction is overlapped and joined to the outer surface of the lower plate side wall portion in the vehicle width direction, and the upper end of the lower plate side wall portion and the inner surface of the upper plate side wall portion in the vehicle width direction are joined by continuous welding, thereby preventing water such as rainwater from entering the interior of the equipment room.

[0013] According to the vehicle of claim 4, in addition to the effects of the vehicle of any one of claims 1 to 3, the frame extends rearward of the vehicle beyond the tank, and the lower plate is mounted on the frame, so that the overlap of the upper plate with respect to the lower plate can be adjusted while the position of the lower plate with respect to the tank is specified. As a result, the task of adjusting the position of the upper plate with respect to the tank can be easily performed.

[0014] According to the vehicle manufacturing method described in claim 5, there are provided a first step of mounting the tank on the frame, a second step of joining the floor portion of the lower plate to the frame at the vehicle rear side of the tank mounted in the first step, and a third step of overlapping and joining the vehicle width direction inner or outer surface of the vehicle width direction of the upper plate side wall portion of the upper plate to the vehicle width direction outer or inner surface of the lower plate side wall portion of the lower plate whose floor portion has been joined to the frame in the second step, thereby facilitating the work of adjusting the position of the upper plate relative to the tank.

[0015] That is, unlike when the lower end of the upper plate (upper plate side wall portion) and the upper end of the lower plate (lower plate side wall portion) are butted together to join, there is no need to perform work such as cutting a component or using a separate component, so the position of the upper plate relative to the tank (height position, inclination angle) can be easily adjusted. In particular, in the third step, the overlap of the upper plate relative to the lower plate can be adjusted while the position of the lower plate relative to the tank is determined in the second step. Therefore, the position of the upper plate relative to the tank (height position, inclination angle) can be easily adjusted compared to, for example, assembling the equipment room (after joining the lower plate and the upper plate) and then disposing the equipment room on the vehicle rear side of the tank. As a result, the work of adjusting the position of the upper plate relative to the tank can be easily performed. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a side view of a tank truck according to a first embodiment of the present invention. [Figure 2] FIG. [Figure 3] 1(a) is a rear perspective view of the upper plate, and FIG. 1(b) is a front perspective view of the upper plate. [Figure 4] 4(a) is a partially enlarged side view of the tank truck, and FIG. 4(b) is a partially enlarged cross-sectional view of the equipment room taken along line IVb-IVb in FIG. 4(a). [Figure 5] 10(a) and 10(b) are enlarged rear perspective views of a part of the equipment compartment. DETAILED DESCRIPTION OF THE INVENTION

[0017] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. First, the overall configuration of a tank truck 10 will be described with reference to Fig. 1. Fig. 1 is a side view of a tank truck 10 in a first embodiment of the present invention. Note that arrows U and D, arrows L and R, and arrows F and B in Fig. 1 indicate the vehicle up-down direction, vehicle width direction (left-right direction), and vehicle front-rear direction of the tank truck 10, respectively. The same applies to Fig. 2 and subsequent Figs.

[0018] The tank truck 10 is a vehicle for transporting cargo such as liquid or gas (in this embodiment, liquefied natural gas), and is configured with a cylindrical tank 12 in which the cargo is loaded, a body 14 on which the tank 12 is mounted, a pair of subframes 16 interposed between the tank 12 and the body 14, an equipment room 100 arranged on the rear side of the vehicle (the side in the direction of arrow B in Figure 1) of the tank 12, and a pressurized evaporator 20 arranged on the lower side of the vehicle (the side in the direction of arrow D in Figure 1) of the tank 12 and the equipment room 100.

[0019] The vehicle body 14 includes a cab 14a serving as a driver's compartment, a pair of chassis frames 14b forming the skeleton of the vehicle body 14, a front traveling device having front wheels 14c and supporting the cab 14a relative to the ground, and a rear traveling device having rear wheels 14d and supporting the rear side of the vehicle (the side in the direction of arrow B in Figure 1) of the vehicle body 14 relative to the ground.

[0020] The pair of chassis frames 14b are beam-like members extending in the vehicle longitudinal direction (arrows F and B in FIG. 1) at a predetermined interval in the vehicle width direction (arrows L and R in FIG. 1), and a plurality of connecting members are connected between the opposing members to form a ladder shape in a plan view. The tank 12 is mounted on the pair of chassis frames 14b via a pair of sub-frames 16.

[0021] The subframe 16 is a beam-shaped member extending in the front-rear direction of the vehicle.

[0022] By supporting the tank 12 on a pair of subframes 16, the tank 12 can be disposed in an inclined position between the opposing subframes 16. In this case, cargo gathers on the inclined side, so the amount of cargo remaining in the tank can be reduced by unloading the cargo from the lower side of the inclination. The tank 12 is inclined downward toward the rear of the vehicle (the direction of arrow B in FIG. 1) (in this embodiment, the inclination angle of the tank 12 with respect to the chassis frame 14b is approximately 1 degree).

[0023] The equipment room 100 is a box-shaped area that stores multiple pipes, valves, etc. As will be described later, the equipment room 100 includes a lower plate 110 (see FIG. 2) and an upper plate 120 (see FIG. 3), which are joined together (see FIG. 4) to form a box-like shape with an internal storage space. An openable door (not shown) is provided on the rear wall of the equipment room 100 (the wall on the direction of arrow B), and opening the door allows the valves, etc., inside the equipment room 100 to be operated.

[0024] Next, the configuration of the equipment chamber 100 will be described with reference to Figures 2 and 3. Figure 2 is a rear perspective view of the lower plate 110.

[0025] 2, the chassis frame 14b extends rearward of the vehicle (in the direction of arrow B) beyond the tank 12, and an equipment room frame 18 is interposed between the extended portion of the chassis frame 14b and the lower plate 110. That is, the equipment room 100 is mounted on the chassis frame 14b via the equipment room frame 18 (see FIG. 4).

[0026] The equipment room frame 18 is formed in a lattice shape in a plan view from a pair of beam-like members (vertical beams 18a) extending in the fore-and-aft direction of the vehicle (direction of arrows F and B) and a plurality of beam-like members (horizontal beams 18b) (three in this embodiment) extending in the width direction of the vehicle (direction of arrows L and R). The upper sides of the vertical beams 18a and horizontal beams 18b are welded to the lower plate 110, and the lower side of the vertical beam 18a is fixed to the chassis frame 14b with bolts.

[0027] The lower plate 110 comprises a floor portion 111 that forms the floor of the equipment room 100, a pair of side wall portions 112 erected on both sides of the floor portion 111 in the vehicle width direction (the side in the direction of arrow L and the side in the direction of arrow R), and a rear wall portion 113 erected on the rear side of the floor portion 111 in the vehicle rear (the side in the direction of arrow B), and is formed by bending a stainless steel (SUS304 in this embodiment) plate.

[0028] The side wall 112 is a portion that forms part of the side wall of the equipment room 100, is bent toward the top of the vehicle (in the direction of arrow U), and has a dimension H1 as its erection dimension from the top surface of the floor 111. The rear wall 113 is a portion that forms part of the rear wall of the equipment room 100, is bent toward the bottom of the vehicle (in the direction of arrow D), and has a dimension H2 as its erection dimension from the top surface of the floor 111.

[0029] The end of the side wall 112 on the front side of the vehicle (the side in the direction of arrow F) is located further forward of the end of the tank 12 on the rear side of the vehicle (the side in the direction of arrow B), and the end of the side wall 112 on the rear side of the vehicle is substantially aligned with the end of the floor 111 on the rear side of the vehicle. A gap of dimension L1 is formed in the vehicle width direction between the end of the rear wall 113 in the vehicle width direction (the direction of arrows L and R) and the outer surface of the side wall 112 (the surface on the outside in the vehicle width direction).

[0030] In this way, by forming a gap of dimension L1 between the side wall portion 112 and the rear wall portion 113, the bending jig can be brought into contact with the end of the bending portion of the side wall portion 112 or the rear wall portion 113 relative to the floor portion 111, and overlapping of the bending portions can be prevented. This makes it easier to perform the bending work of the lower plate 110, improves the dimensional accuracy of the lower plate 110, and makes it easier to join the lower plate 110 to the upper plate 120 by welding.

[0031] Fig. 3(a) is a rear perspective view of the upper plate 120, and Fig. 3(b) is a front perspective view of the upper plate 120. In Fig. 3(b), the front plate 130 is schematically illustrated using a two-dot chain line.

[0032] As shown in Figure 3, the upper plate 120 includes a ceiling wall portion 121 that forms the ceiling wall of the equipment room 100, a pair of side wall portions 122 arranged on both sides of the ceiling wall portion 121 in the vehicle width direction (the side in the direction of arrow L and the side in the direction of arrow R), and a rear wall portion 123 arranged on the rear side of the vehicle (the side in the direction of arrow B) of the ceiling wall portion 121 and the side wall portion 122, and is formed by bending and welding a plate made of general structural rolled steel (SS400 in this embodiment).

[0033] In this embodiment, the side wall portion 122 and the rear wall portion 123 are formed as an integrated member by bending a plate, and the integrated member (side wall portion 122 and rear wall portion 123) is joined to the ceiling wall portion 121 by welding.

[0034] The ceiling wall 121 is curved in an arc shape to fit the outer shape of the tank 12. The side wall 122 and the rear wall 123 are formed flat, and respectively form part of the side wall and part of the rear wall of the equipment room 100. The above-mentioned door (not shown) is disposed in an opening portion of the rear wall 123 so as to be able to open and close.

[0035] The dimension of the side wall portions 122 in the vehicle longitudinal direction (directions of arrows F and B) is set to be approximately the same as the dimension of the side wall portions 112 (see FIG. 2) in the vehicle longitudinal direction. In addition, the distance between the inner surfaces of the pair of side wall portions 122 in the vehicle width direction (directions of arrows L and R) is set to be approximately the same as the distance between the outer surfaces of the pair of side wall portions 112 (see FIG. 2) in the vehicle width direction.

[0036] The rear wall 123 has a protruding region 123a that protrudes downward (in the direction of arrow D) from the lower edge of the side wall 122. The protruding dimension of the protruding region 123a in the vehicle vertical direction (in the directions of arrows U and D) is dimension H3, which is larger than dimension H2 (see FIG. 2) of the rear wall 113 (H2 <H3)。

[0037] A gap of dimension L2 in the vehicle width direction is formed between the outer end of the protruding region 123a in the vehicle width direction (directions of arrows L and R) and the inner surface in the vehicle width direction of the side wall portion 122. Note that dimension L2 of the protruding region 123a is approximately the same as dimension L1 (see FIG. 2) of the rear wall portion 113 (L2≈L1).

[0038] In this way, by forming a gap of dimension L2 between the side wall portion 122 and the protruding region 123a, the influence of the protruding region 123a on the deformability of the end portion (the end portion on the protruding region 123a side) of the bent portion between the side wall portion 122 and the rear wall portion 123 can be suppressed, thereby improving dimensional accuracy.

[0039] Furthermore, due to the distance of the above dimension L2, when joining the upper plate 120 to the lower plate 110, it is not necessary to abut the inner surface of the upper plate 120 (rear wall portion 123 or protruding area 123a) against the end face C (see Figure 5(a)) of the bent portion of the lower plate 110 (side wall portion 112 relative to floor portion 111), making it easier to join the two.

[0040] The front plate 130 is a member that forms the front wall of the equipment room 100, and as will be described later, after the upper plate 120 is joined to the lower plate 110 by welding, the front plate 130 is joined to the outer surface of the tank 12, the inner surface of the side wall portion 122, and the upper surface of the floor portion 111 (see FIG. 2) by welding. The front plate 130 is formed from a plate made of general structural rolled steel (SS400 in this embodiment).

[0041] Next, a manufacturing method of the tank truck 10 will be described with reference to Figures 4 and 5. Figure 4(a) is a partially enlarged side view of the tank truck 10, and Figure 4(b) is a partially enlarged cross-sectional view of the equipment compartment 100 taken along line IVb-IVb in Figure 4(a). Figures 5(a) and 5(b) are partially enlarged rear perspective views of the equipment compartment 100, with Figure 5(a) showing the state before joining and Figure 5(b) showing the state after joining.

[0042] The manufacturing of the tank truck 10 involves mounting the tank 12 on the chassis frame 14b via a subframe 16 (first step), and then mounting the lower plate 110 on the chassis frame 14b on which the tank 12 is mounted via an equipment room frame 18 (second step, see Figure 2).

[0043] In the second step, after joining the equipment room frame 18 to the chassis frame 14b, the lower plate 110 (floor portion 111) may be joined to the equipment room frame 18, or after joining the lower plate 110 (floor portion 111) to the equipment room frame 18, the equipment room frame 18 may be joined to the chassis frame 14b.

[0044] As shown in Figures 4 and 5, after the lower plate 110 is mounted on the chassis frame 14b via the equipment room frame 18 in the second step, the vehicle width direction outer surfaces (left side surfaces in Figure 4(b)) of the pair of side wall portions 112 of the lower plate 110 are overlapped with the vehicle width direction inner surfaces (right side surfaces in Figure 4(b)) of the pair of side wall portions 122 of the upper plate 120, and the two are joined by welding (third step).

[0045] Here, in the third step, it is necessary to adjust the position (height position) of the upper plate 120 relative to the tank 12, and if the tank 12 is tilted, it is also necessary to adjust the tilt angle of the upper plate 120.

[0046] In the conventional manufacturing method in which the lower end (end face on the lower side of the vehicle) of the side wall portion 122 of the upper plate 120 is butted against the upper end (end face on the upper side of the vehicle) of the side wall portion 112 of the lower plate 110 and the two are joined by welding, in order to adjust the position (height position, inclination angle) of the upper plate 120 relative to the tank 12, it is necessary to cut down the butted portion (the upper end of the side wall portion 112 or the lower end of the side wall portion 122) or to insert a separate member in the butted portion, which is time-consuming.

[0047] In contrast, according to the above manufacturing method (third step), by changing the overlap of the upper plate 120 (side wall portion 122) with respect to the lower plate 110 (side wall portion 112), the upper plate 120 can be moved in the directions of arrows U and D or rotated around the arrows L and R. This makes it possible to easily adjust the position (height position, inclination angle) of the upper plate 120 with respect to the tank 12.

[0048] In particular, in the third step, the overlap of the upper plate 120 with respect to the lower plate 110 can be adjusted with the position of the lower plate 110 with respect to the tank 12 defined in the second step. Therefore, for example, the position (height position, inclination angle) of the upper plate 120 with respect to the tank 12 can be easily adjusted compared to when the equipment room 100 is assembled (after the lower plate 110 and the upper plate 120 are joined) and then the equipment room 100 is disposed on the vehicle rear side of the tank 12 (because the outer shapes of the tank 12 and the equipment room 100 are each fixed, it is difficult to absorb their manufacturing tolerances).

[0049] In this embodiment, the vehicle width direction outer surfaces (left side surfaces in Figure 4(b)) of the pair of side wall portions 112 of the lower plate 110 are overlapped and welded to the vehicle width direction inner surfaces (right side surfaces in Figure 4(b)) of the pair of side wall portions 122 of the upper plate 120, thereby preventing water such as rainwater flowing down the outer surfaces of the side wall portions 122 from entering the interior of the equipment room 100.

[0050] In the third step, the welding between the side wall portion 112 of the lower plate 110 and the side wall portion 122 of the upper plate 120 is performed by intermittent welding (in this embodiment, the welding length is approximately 30 mm and the pitch is approximately 100 mm) at the welding portion A1 between the lower end (lower end face in Figure 4(b)) of the side wall portion 122 of the upper plate 120 and the outer surface of the side wall portion 112 of the lower plate 110 in the vehicle width direction (left surface in Figure 4(b)), and by continuous welding at the welding portion A2 between the upper end (upper end face in Figure 4(b)) of the side wall portion 112 of the lower plate 110 and the inner surface of the side wall portion 122 of the upper plate 120 in the vehicle width direction (right surface in Figure 4(b)).

[0051] This allows continuous welding to be applied to welding portion A2 where welding is easy (welding can be performed from the floor 111 of the lower plate 110 in a downward position by an operator, making it easy to operate the welding rod), and intermittent welding to welding portion A1 where welding is difficult (welding must be performed from the ground in an upward position by an operator, making it difficult to operate the welding rod).As a result, the ease of welding can be improved while ensuring the strength of the joint between the lower plate 110 (side wall portion 112) and the upper plate 120 (side wall portion 122).

[0052] In this embodiment, the dimension H1 (see FIG. 2) of the side wall 112 of the lower plate 110 is set to 90 mm. The dimension H1 of the side wall 112 is preferably set to a dimension (e.g., approximately 370 mm or less) smaller than approximately half the vehicle vertical dimension (direction of arrows U and D) of the side wall of the equipment room 100 (the dimension from the upper surface of the floor 111 to the boundary between the ceiling wall 121 and the side wall 122). This is because it is possible to reduce the amount of stainless steel member (lower plate 110) used, reduce material costs, and ensure the ease of welding at the welded portion A2. Furthermore, in a relatively large vehicle in which the vehicle vertical dimension of the side wall of the equipment room 100 exceeds, for example, 2 m, the welding position is prevented from becoming too high, thereby preventing the welding work from becoming dangerous work at a height.

[0053] As described above, the rear wall portions 113, 123 of the lower plate 110 and the upper plate 120 are spaced apart by the dimensions L1, L2 (see FIGS. 2 and 3(b)). Therefore, as shown in FIG. 5, it is not necessary to abut the inner surface of the upper plate 120 (rear wall portion 123 or protruding region 123a) against the end face C of the bent portion of the lower plate 110 (side wall portion 112 relative to floor portion 111), which makes it easier to join the two.

[0054] On the other hand, since an opening is formed in the rear wall portion 123 due to the dimension L2, in this embodiment, a cover plate 140 is welded to the inner surfaces of the lower plate 110 and the upper plate 120 to close the opening. The cover plate 140 is formed by bending a plate that is rectangular in front view, with one outer surface facing the inner surface of the side wall portion 112 of the lower plate 110 and the other outer surface facing the inner surfaces of the rear wall portion 123 and the protruding region 123a of the upper plate 120. The cover plate 140 is formed from a plate made of general structural rolled steel (SS400 in this embodiment).

[0055] In the third step, the lower plate 110 and the upper plate 120 are joined together, and the tank 12 is joined to the ceiling wall portion 121 of the upper plate 120. After these are joined together, the front plate 130 is joined to the tank 12, the lower plate 110, and the upper plate 120.

[0056] The present invention has been described above based on an embodiment, but the present invention is not limited to the above embodiment, and it can be easily inferred that various improvements and modifications are possible within the scope of the present invention.

[0057] The numerical values ​​given in the above embodiment are merely examples, and other numerical values ​​can of course be adopted. For example, the number of cross beams 18b may be two or less, or may be three or more. In addition, the welding conditions for intermittent welding (welding length, pitch) can be set arbitrarily depending on the plate thickness, etc.

[0058] In the above embodiment, the vehicle width direction inner side surfaces of the pair of side wall portions 122 are overlapped with the vehicle width direction outer side surfaces of the pair of side wall portions 112, but the following arrangement may also be used.

[0059] For example, the vehicle width direction outer side surfaces of the pair of side wall portions 122 may be overlapped with the vehicle width direction inner side surfaces of the pair of side wall portions 112. Alternatively, on one vehicle width direction side (e.g., the side in the direction of arrow L), the vehicle width direction inner side surfaces of the side wall portions 122 may be overlapped with the vehicle width direction outer side surfaces of the side wall portions 112, and on the other vehicle width direction side (e.g., the side in the direction of arrow R), the vehicle width direction outer side surfaces of the side wall portions 122 may be overlapped with the vehicle width direction inner side surfaces of the side wall portions 112. Even with these arrangements, as in the above embodiment, the position (height position, inclination angle) of the upper plate 120 relative to the tank 12 can be easily adjusted by adjusting the overlap of the upper plate 120 relative to the lower plate 110. Note that when the vehicle width direction outer side surfaces of the side wall portions 122 are overlapped with the vehicle width direction inner side surfaces of the side wall portions 112, the welding position is also performed along the overlap portion.

[0060] In the above embodiment, the vertical beams 18a of the equipment room frame 18 are constructed from a separate member from the subframe 16, but the subframe 16 may be extended rearward from the tank 12, and multiple horizontal beams 18b may be joined to the extended portion of the subframe 16 to form the equipment room frame 18.

[0061] In the above embodiment, the rear wall portion 113 of the lower plate 110 is bent downward (in the direction of arrow D) of the vehicle, but the rear wall portion 113 of the lower plate 110 may be bent upward (in the direction of arrow U) of the vehicle. Even in this case, as in the above embodiment, by changing the overlap of the upper plate 120 (side wall portion 122) with respect to the lower plate 110 (side wall portion 112) and rotating the upper plate 120 around the arrows L and R, the bending angle of the rear wall portion 113 with respect to the floor portion 111 can be adjusted to bring the rear wall portion 123 into contact with the rear wall portion 113.

[0062] In the above embodiment, the tank 12 is tilted downward toward the rear of the vehicle, but the tank 12 may also be tilted downward toward the front of the vehicle, or the tank 12 may not be tilted and may be parallel to the chassis frame 14b.

[0063] In the above embodiment, a tank truck is exemplified as an application target (vehicle) of the present invention, but the present invention may be applied to other vehicles, such as a tank trailer or a tank semi-trailer. [Explanation of symbols]

[0064] 10 Tanker truck (vehicle) 12 Tank 14b Chassis frame (frame) 16 Subframe (frame) 18 Equipment room frame (frame) 100 Equipment room 110 Lower plate 111 Floor 112 Side wall (lower plate side wall) 120 Upper Plate 121 Ceiling wall section 122 Side wall (upper plate side wall) Arrows L and R: Vehicle width direction Arrows U and D indicate the vehicle's up and down direction. Arrows F and B: Front and rear of the vehicle

Claims

1. A vehicle having a frame, a tank mounted on the frame, and an equipment room disposed on the rear side of the tank, The equipment compartment includes a lower plate and an upper plate, the lower plate includes a floor portion that forms a floor, and lower plate side wall portions that are disposed on both sides of the floor portion in the vehicle width direction and form part of the side walls, the upper plate includes a ceiling wall portion that forms a ceiling wall that curves along the tank, and upper plate side wall portions that are disposed on both sides of the ceiling wall portion in the vehicle width direction and form part of side walls, A vehicle characterized in that the vehicle width direction inner surface or outer surface of the upper plate side wall portion is overlapped and joined to the vehicle width direction outer surface or inner surface of the lower plate side wall portion.

2. 2. The vehicle according to claim 1, wherein the area where the vehicle width direction inner or outer surface of the upper plate side wall portion and the vehicle width direction outer or inner surface of the lower plate side wall portion overlap is located below the vehicle vertical center of the side wall of the equipment compartment.

3. an inner surface of the upper plate side wall portion in the vehicle width direction overlapping and joined to an outer surface of the lower plate side wall portion in the vehicle width direction; 3. The vehicle according to claim 1, wherein an upper end of the lower plate side wall portion and an inner surface of the upper plate side wall portion in the vehicle width direction are joined by continuous welding.

4. The frame extends rearward of the vehicle relative to the tank, 4. The vehicle according to claim 1, wherein the lower plate is mounted on the frame.

5. The vehicle comprises a frame, a tank mounted on the frame, and an equipment room disposed on the rear side of the tank, a vehicle manufacturing method for manufacturing a vehicle in which the equipment compartment includes a floor portion forming a floor, a lower plate having lower plate side wall portions disposed on both sides of the floor portion in the vehicle width direction and forming part of the side walls, a ceiling wall portion forming a ceiling wall curved along the tank, and an upper plate having upper plate side wall portions disposed on both sides of the ceiling wall portion in the vehicle width direction and forming part of the side walls, a first step of mounting the tank on the frame; a second step of joining the floor portion of the lower plate to the frame at the vehicle rear side of the tank mounted in the first step; and a third step of overlapping and joining the vehicle width direction inner or outer surface of the upper plate side wall portion of the upper plate to the vehicle width direction outer or inner surface of the lower plate side wall portion of the lower plate, whose floor portion has been joined to the frame in the second step.

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