Railway vehicle

Abstract

To provide a railway vehicle capable of securing a large space on the floor surface of a loading platform.SOLUTION: The railway vehicle includes a loading platform, a plurality of wheels disposed below the loading platform, a load receiving platform lifting device attached to the loading platform, and a hydraulic drive source that operates the load receiving platform lifting device. The load receiving platform lifting device includes a lifting mechanism fixed to the loading platform, a load receiving platform that is raised and lowered between the floor surface of the loading platform and the ground by the lifting mechanism, and a hydraulic actuator connected to the lifting mechanism to raise and lower the load receiving platform. The hydraulic drive source includes a hydraulic pump that supplies hydraulic oil to the hydraulic actuator. The hydraulic pump is disposed below the floor plate of the loading platform and in a position that vertically overlaps the floor plate.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a railway vehicle. [Background technology]

[0002] Patent Document 1 describes a railway vehicle equipped with a wheelchair access device on the side of the vehicle, which includes a loading section that moves up and down between the floor of the vehicle and the ground.

[0003] In this access device, the lifting mechanism (first arm and second arm) is electrically operated to raise and lower the loading unit connected to the lifting mechanism. The lifting mechanism is operated by electrically controlling a hydraulic actuator. However, Patent Document 1 does not disclose a hydraulic drive source for driving the hydraulic actuator, and depending on where the hydraulic drive source is located, the space available on the floor may be limited. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Registered Utility Model No. 3216922 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the problem is to provide a railway vehicle that can secure a large space on the floor surface of the loading platform. [Means for solving the problem]

[0006] A railway vehicle according to the present invention comprises a loading platform, a plurality of wheels arranged under the loading platform, a loading platform lifting device attached to the loading platform, and a hydraulic drive source that operates the loading platform lifting device; The loading platform lifting device includes a lifting mechanism fixed to the loading platform, a loading platform that is raised and lowered between the floor of the loading platform and the ground by the lifting mechanism, and a hydraulic actuator that is connected to the lifting mechanism and raises and lowers the loading platform, the hydraulic drive source includes a hydraulic pump that supplies hydraulic oil to the hydraulic actuator; The hydraulic pump is disposed below the floor plate of the loading platform and at a position overlapping the floor plate in the vertical direction. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a left side view of a railway vehicle according to an embodiment; [Figure 2] FIG. 1 is a rear view of a railway vehicle according to the embodiment; [Figure 3] FIG. 1 is a plan view of a railway vehicle according to the embodiment; [Figure 4] Perspective view of the loading platform lifting device [Figure 5] Cross-sectional view of the lifting mechanism of the loading platform lifting device [Figure 6] Cross-sectional side view of the loading platform lifting device [Figure 7] Cross section of the rear of the loading platform [Figure 8] Cross-sectional view showing the structure of the loading platform lifting device attached to the loading platform [Figure 9] An exploded view illustrating the structure of the loading platform lifting device mounted on the loading platform. [Figure 10] Left side view of the loading platform before installing the loading platform lifting device [Figure 11] Plan view of the loading platform before the loading platform lifting device is installed [Figure 12] Left side view of the loading platform after the loading platform lifting device is installed [Figure 13] Electrical and hydraulic circuit for loading platform lifting device [Figure 14] 10 is a side view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 15] FIG. 10 is a front view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 16] 10 is a side view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 17] FIG. 10 is a front view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 18] 10 is a side view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 19] FIG. 10 is a front view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 20] 10 is a side view of a loading platform lifting device for a railway vehicle according to another embodiment; [Figure 21] 10 is a side view of a loading platform lifting device for a railway vehicle according to another embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0008] In each drawing, the dimensions of the components may be enlarged or reduced relative to the actual dimensions, for example, to facilitate understanding, and the dimensional ratios between the drawings may not be consistent. Note that in each drawing, for example, to facilitate understanding, some of the components may be omitted.

[0009] Terms including ordinal numbers such as "first" and "second" are used to describe various components, but these terms are used only to distinguish one component from another, and the components are not particularly limited by these terms. The number of components including ordinal numbers is not particularly limited, and may be, for example, one. Furthermore, the ordinal numbers used in the following specification and drawings may differ from the ordinal numbers described in the claims.

[0010] In the following description, the first direction (first lateral direction) D1 is also referred to as the front-to-back direction D1, and the direction of the arrow in the drawings is the forward direction, and the direction opposite to the arrow in the drawings is the backward direction. The second direction (second lateral direction) D2 is also referred to as the left-to-right direction D2, and the direction of the arrow in the drawings is the leftward direction, and the direction opposite to the arrow in the drawings is the rightward direction. The third direction D3 is also referred to as the up-down direction D3, and the direction of the arrow in the third direction D3 in each drawing is the upward direction, and the direction opposite to the arrow in each drawing is the downward direction.

[0011] An embodiment of a railway vehicle will be described below with reference to Figures 1 to 13. Note that the following embodiment is provided as an example to aid in understanding the configuration of the railway vehicle, and is not intended to limit the configuration of the railway vehicle.

[0012] [Railway vehicles] As shown in Fig. 1, the railway vehicle 1 may include a loading platform 2, a bogie 3 fixed below the loading platform 2, and a loading platform lifting device 4 attached to the loading platform 2. The railway vehicle 1 is not particularly limited, but may be a freight car on which cargo is carried, as in this embodiment. The railway vehicle 1 does not include a power source for running, and is a towed vehicle that is towed by a locomotive or the like, for example.

[0013] 2, the loading platform 2 may include an underframe 20 and a floor panel 21 fixed onto the underframe 20. The loading platform 2 may also include a front panel 22 erected at the front end of the underframe 20, a rear panel 23 erected at the rear end of the underframe 20, and side panels 24 erected at both left and right ends of the underframe 20. In this embodiment, the loading platform 2 is open at the top, but is not limited to this configuration and may, for example, be box-shaped with a ceiling and a closed top.

[0014] The underframe 20 may include a plurality of front and rear beams 25 extending in the front-rear direction D1 and a plurality of left and right beams 26 extending in the left and right direction D2. The plurality of front and rear beams 25 is not particularly limited, but may include six front and rear beams 25a to 25f.

[0015] The floor panel 21 has, for example, a floor surface 21a on which luggage is loaded. As a result, the space above the floor surface 21a becomes a luggage loading space. The floor panel 21 of this embodiment is smaller than the underframe 20 in a plan view (as viewed in the up-down direction D3). That is, the front end of the floor panel 21 is located rearward of the front end of the underframe 20 (the front end of the foremost left and right beams 26), the rear end of the floor panel 21 is located forward of the rear end of the underframe 20 (the rear end of the rearmost left and right beams 26), the left end of the floor panel 21 is located to the right of the left end of the underframe 20 (the left end of the leftmost front and rear beam 25a), and the right end of the floor panel 21 is located leftward of the right end of the underframe 20 (the right end of the rightmost front and rear beam 25f).

[0016] The front plate 22 is disposed on the frontmost left and right beams 26. The rear plate 23 is disposed on the rearmost left and right beams 26. The front plate 22 and the rear plate 23 are plate members that can be inserted and removed in the up-down direction D3. The front plate 22 and the rear plate 23 may be gate doors that are connected to the underframe 20 so as to be rotatable about an axis in the left-right direction D2.

[0017] The side plates 24 are disposed on the leftmost and rightmost front and rear beams 25a, 25f. The side plates 24 are plate members that can be inserted and removed in the up-down direction D3. The side plates 24 may be gate doors that are connected to the underframe 20 so as to be rotatable about an axis in the front-to-rear direction D1. A plurality of side plates 24 are provided in the front-to-rear direction D1.

[0018] The bed 2 may include side pillar members 24a that are erected on the underframe 20 and support both end edges of the side plates 24. The side pillar members 24a extend in the vertical direction D3. The side pillar members 24a have grooves that extend in the vertical direction D3. The side pillar members 24a may be configured to be detachable from the underframe 20.

[0019] 1, the side plates 24 have approximately the same height as the side post members 24a. The side plates 24 are removable and insertable in the vertical direction D3 along the grooves of the side post members 24a. The front plate 22 and the rear plate 23 are also removable and insertable in the vertical direction D3 along the grooves of the side post members 24a.

[0020] The bed 2 also includes couplers 2a for coupling to a locomotive or another railway vehicle 1. The couplers 2a are provided at the front and rear ends of the underframe 20. The bed 2 may also include steps 2b at the front and rear ends of the underframe 20.

[0021] The railway vehicle 1 may include a pair of bogies 3, 3 at the front and rear. The bogie 3 includes a pair of left and right wheels 31a, 31b that run on the rails R, an axle 32 that connects the wheels 31a, 31b, and suspension devices 33a, 33b that support the axle 32. The bogie 3 may also include a shock absorber provided between the bogie 3 and the platform 2, and a brake device for stopping the wheels 31a, 31b.

[0022] As shown in FIG. 2, the wheel 31a is disposed between the front and rear beams 25b and 25c, and the wheel 31b is disposed between the front and rear beams 25d and 25e.

[0023] The axle 32 extends in the left-right direction D2 to connect the wheels 31a and 31b, with both left and right ends of the axle 32 protruding outward from the wheels 31a and 31b, respectively.

[0024] The suspensions 33a and 33b rotatably support the left and right ends of the axle 32. The axle 32 can rotate freely relative to the suspensions 33a and 33b. In other words, the wheels 31a and 31b are non-drive wheels. As shown in FIG. 2, the suspension 33a is fixed to the front and rear beams 25b, and the suspension 33b is fixed to the front and rear beams 25e.

[0025] The railway vehicle 1 may be provided with platform lifting devices 4, 4 attached to both side edges of the platform 2 in the left-right direction D2. The platform lifting device 4 is attached to the side edges of the platform 2. Specifically, the platform lifting device 4 is attached between side plates 24 arranged at intervals in the front-rear direction D1, more specifically, between side pillar members 24a arranged at intervals in the front-rear direction D1. The platform lifting device 4 is attached to approximately the center of the platform 2 in the front-rear direction D1. The platform lifting device 4 is used, for example, when loading and unloading luggage from the side of the platform 2 onto the floor surface 21a of the platform 2.

[0026] [Load receiving platform lifting device] The loading platform lifting device 4 may, for example, as in this embodiment, be equipped with a vertical lifting mechanism 5, a loading platform 6 that is raised and lowered by the lifting mechanism 5, and a drive device 7 connected to the lifting mechanism 5 and that raises and lowers the loading platform 6.

[0027] The lifting mechanism 5 may, for example, as in this embodiment, include a pair of cylindrical outer columns 51, 51 extending in the vertical direction D3, cylindrical inner columns 52, 52 extending in the vertical direction D3, inserted into the outer columns 51 and moving in the vertical direction D3 relative to the outer columns 51, and a cylindrical cross member 53 extending in the first horizontal direction D1 and connecting the pair of outer columns 51, 51.

[0028] The outer column 51 is fixed to the outer periphery of the side edge of the underframe 20. The outer column 51 is formed of a hollow rectangular cylinder, with a top plate 51a fixed to the open upper end thereof, and an intermediate plate 51b (see FIG. 6) is provided vertically and integrally in the center of the outer column 51. An outer slit 51c is opened in the rear wall of the outer column 51 to guide a slider 54, which will be described later, in the vertical movement. A pair of guide rollers 51d are rotatably supported at the lower end of the outer column 51 to guide the vertical movement of the inner column 52, and further, a stopper 51e, against which the lower end of the inner column 52 abuts, is fixed to the lower end of the outer column 51. A first retainer (not shown) with which the upper end of the inner column 52 engages is provided at the lower end of the outer column 51.

[0029] The inner column 52 is inserted into the outer column 51. The inner column 52 is configured as a hollow rectangular cylinder, and an inner slit 52a is opened in the rear wall so as to coincide with the outer slit 51c of the outer column 51. As shown in FIG. 6, a pair of guide rollers 52c are rotatably supported via brackets 52b at the upper end of the inner column 52, and these guide rollers 52c roll on the inner surface of the rear wall of the outer column 51 to guide the rising and falling of the inner column 52 when the inner column 52 is raised and lowered.

[0030] As shown in FIG. 6, an elastic stopper 52e is provided at the lower end of the inner column 52 via a bracket 52d, and this elastic stopper 52e abuts against a stopper 51e at the lower end of the outer column 51 to regulate the uppermost position of the inner column 52. A first retainer (not shown) is provided at the upper end of the inner column 52, and this retainer engages with the first retainer of the outer column 51 to restrict the lowest position of the inner column 52. This lowest position is a position where the upper end of the inner column 52 remains slightly inserted into the lower end of the outer column 51.

[0031] The cross member 53 is fixed to the middle portion of the pair of outer columns 51 in the up-down direction D3 so that its upper surface extends in the first lateral direction D1 at approximately the same height as the floor surface 21a of the cargo bed 2. The cross member 53 is made up of a hollow rectangular cylinder, and is configured by integrally fixing a cover main body 53b to the opening surface of a cross member main body 53a having a U-shaped cross section with a plurality of bolts or the like (not shown).

[0032] The lifting mechanism 5 may be equipped with a slider 54 that moves in the vertical direction D3 relative to the outer column 51 and the inner column 52, for example, as in this embodiment. The slider 54 is arranged across the inside and outside of the outer column 51 and the inner column 52 by being inserted through the outer slit 51c and the inner slit 52a. As a result, the slider 54 is guided by the outer slit 51c and the inner slit 52a and can move in the vertical direction D3 relative to the outer column 51 and the inner column 52. At this time, the slider 54 moves in the vertical direction D3 relative to the inner column 52, the slider 54 and the inner column 52 move in the vertical direction D3 together with the outer column 51, or the slider 54 moves in the vertical direction D3 relative to the inner column 52 and the outer column 51.

[0033] Vertical guide rollers 54a are rotatably supported on the upper and lower parts of the slider 54, and these vertical guide rollers 54a roll on the inner surface of the inner column 52 when the slider 54 moves up and down relative to the inner column 52. A stopper rubber 54b is provided at the upper end of the slider 54, and this stopper rubber 54b engages with a base plate 52f fixed to the upper part of the inner column 52 to regulate the elevated position of the slider 54. A second retainer (not shown) is provided on the slider 54, and this second retainer engages with a second retainer (not shown) provided at the lower part of the inner column 52 to regulate the lowered position of the slider 54. When the slider 54 is in the lowered position, a part of the slider 54 remains inserted in the lower part of the inner column 52. A stay 54e fixed to the lower end of the slider 54 is fitted with a stopper bolt 54f that can be adjusted in vertical position to engage with the base end of the receiving platform 6 and lock it in the receiving position.

[0034] The lifting mechanism 5 may be provided with a safety bar 55 that is supported on the lower rear surface of the cross member 53 and extends along the cross member 53. Operation of this safety bar 55 allows the operation of the loading platform lifting device 4 to be stopped in an emergency.

[0035] The receiving platform 6 is fixed to the slider 54. As a result, as shown in Figures 4 and 6, the receiving platform 6 can move in the vertical direction D3 between a lower end position (shown by a solid line) and an upper end position (shown by a two-dot chain line). As a result, the receiving platform 6 can move up and down between the floor surface 21a and the ground.

[0036] The receiving platform 6 is rotatably connected to the slider 54. Specifically, the receiving platform 6 is pivotally supported by a pin 54d relative to a bracket 54c provided at the lower end of the slider 54 so as to be rotatable between a receiving position in a substantially horizontal direction as shown in FIG. 6 and an upright position in a substantially vertical direction as shown in FIG. 6.

[0037] In the upright position, the loading platform 6 is folded along the pair of outer columns 51. As a result, when not in use, the loading platform 6 is positioned in the upright position between the side pillar members 24a arranged at intervals in the front-rear direction D1, and may also serve as a door for the loading platform 2.

[0038] A lashing device 61 is provided between the side surface of the receiving platform 6 and the pair of outer columns 51, for securing the receiving platform 6 that has been rotated to the upright position. The lashing device 61 may include a lock handle 61a that is rotatably provided on each side surface of the receiving platform 6 and slidably in the first lateral direction D1, and a hook 61b that is fixed to the side surface of the pair of outer columns 51 and that is detachably engaged with the lock handle 61a. When the receiving platform 6 is folded to the upright position, the lock handle 61a engages with the hook 61b, thereby securing the receiving platform 6 in the upright position. This allows the receiving platform lifting device 4 to hold the receiving platform 6 in the upright position.

[0039] The driving device 7 includes a hydraulic cylinder 71, a wire interlocking mechanism 72, and a power unit 73 (see FIG. 1) that drives the hydraulic cylinder 71 to extend and retract.

[0040] The hydraulic cylinder 71 is disposed within the cross member 53 along the longitudinal direction (first lateral direction D1) of the cross member 53, and the base end of the cylinder barrel 71a is fixed to a rib plate 71b welded to the inside of one end of the cross member 53. This rib plate 71b extends in the vertical direction D3 from the center of one end of the cross member 53 in the second lateral direction D2, and its upper and lower edges are welded to the upper and lower inner surfaces of the cross member 53.

[0041] The load receiving platform 6 is interlocked with a hydraulic cylinder 71 via a wire interlocking mechanism 72 that is provided across the pair of outer columns 51 and the cross member 53, and its elevation is controlled by the extension and contraction of the hydraulic cylinder 71. Top fixed sheaves 720a, 720b for guiding left-system wires 725 and right-system wires 726, which will be described later, are rotatably supported at the upper end of the outer column 51, and movable sheaves 721a, 721b are rotatably attached to the cross member 53 via brackets 724 in parallel and movable in the first lateral direction D1. In addition, side fixed sheaves 722a to 722c are rotatably attached to both ends of the cross member 53.

[0042] The detailed configuration of the wire interlocking mechanism 72 will be described below.

[0043] As shown in Figure 5, the tip of the cylinder rod 71c of the hydraulic cylinder 71 extends halfway into the cross member 53, and a first movable sheave 721a and a second movable sheave 721b, which are movable in the first lateral direction D1, are rotatably attached to the tip via a bracket 724 in parallel in the second lateral direction D2, and the bracket 724 is slidably supported on a guide rail 723 fixed along the longitudinal direction within the cross member 53.

[0044] A pair of first and second side fixed sheaves 722a and 722b are rotatably attached to the left end of the cross member 53 shown in FIG. 5 in parallel in the second lateral direction D2, and a third side fixed sheave 722c is rotatably attached to the right end of the cross member 53 shown in FIG. 5. Furthermore, a first top fixed sheave 720a and a second top fixed sheave 720b are rotatably attached to the upper parts of the left and right outer columns 51, 51, respectively. A left system wire 725 and a right system wire 726 are connected to the hydraulic cylinder 71. That is, one end of the left system wire 725 is fastened to an end 725a in the middle of the cross member 53 and extends along the cross member 53, and is wound around the first movable sheave 721a, the first side fixed sheave 722a, and the first top fixed sheave 720a in that order, and the other end is fastened to the left slider 54. Similarly, one end of the right system wire 726 is attached to the end 726a of the middle part of the cross member 53 and extends along the cross member 53, and is wound sequentially around the second movable sheave 721b, the second side fixed sheave 722b, the third side fixed sheave 722c and the second top fixed sheave 720b, and the other end is attached to the right slider 54.

[0045] Therefore, when the hydraulic cylinder 71 is extended or retracted, the pair of left and right sliders 54 are raised and lowered in unison via the two wire systems 725, 726, and the load receiving platform 6 connected thereto can be raised and lowered.

[0046] 2, the power unit 73 may be disposed below the floor plate 21 of the cargo bed 2 and at a position overlapping the floor plate 21 in the up-down direction D3. This prevents the power unit 73 from protruding from the front, rear, left, or right of the cargo bed 2, and is less likely to get in the way during work or travel.

[0047] As shown in Fig. 2, the power unit 73 may be disposed so as not to overlap with the wheels 31a, 31b in the front-to-rear direction D1. Alternatively, the power unit 73 may be disposed between the wheels 31a and 31b. Alternatively, the power unit 73 may be disposed between the frontmost wheels 31a, 31b and the rearmost wheels 31a, 31b, as shown in Fig. 1. This prevents the power unit 73 from getting in the way, particularly when driving.

[0048] 7, the power unit 73 is supported by a bracket 731 fixed to the underframe 20. More specifically, the bracket 731 is fixed to the front and rear beams 25c, 25d on the center side in the left-right direction D2. The bracket 731 is disposed closer to the center in the left-right direction D2 than the wheels 31a, 31b.

[0049] An upper portion of the bracket 731 is fixed to the center of the front and rear beams 25c, 25d in the left-right direction D2. The bracket 731 is also fixed so as to cover the openings of the front and rear beams 25c, 25d. The bracket 731 may be a plate member with a J-shaped cross section that extends downward from the front and rear beams 25c, 25d and then curves toward the center in the left-right direction D2. This makes the power unit 73 less likely to break down because both side portions and a lower portion are covered and protected by the bracket 731.

[0050] The bed 2 may also include a reinforcing plate 732 welded across the upper and lower flanges of the front and rear beams 25c, 25d. The bed 2 may also include a reinforcing rib 733 welded to the back surface of the bracket 731 and the lower surfaces of the lower flanges of the front and rear beams 25c, 25d.

[0051] [Installation structure of the loading platform lifting device on the loading platform] Next, the mounting structure of the loading platform lifting / lowering device 4 to the loading platform 2 will be described in detail.

[0052] The loading platform lifting / lowering device 4 is fixed to the side edge of the loading platform 2. More specifically, the outer column 51 of the loading platform lifting / lowering device 4 is fixed to the side edge of the underframe 20 of the loading platform 2.

[0053] As described above, the underframe 20 includes the front and rear beams 25a, 25f that support from below the left and right side edges of the floor panel 21. The front and rear beams 25a, 25f are formed, for example, from C-shaped steel, and have a C-shaped cross section that opens to the outside of the loading platform 2.

[0054] The loading platform 2 may include a mounting plate 27 that covers the openings in the front and rear beams 25a, 25f. The outer column 51 and cross member 53 of the loading platform lifting device 4 are welded to the outer surface of the mounting plate 27. The mounting plate 27 may include a reinforcing plate 27a and a mounting plate 27b. The mounting plate 27 may also include a reinforcing rib 27c.

[0055] The reinforcing plate 27a is welded to straddle the upper and lower flanges of the front and rear beams 25a, 25f, thereby reinforcing the front and rear beams 25a, 25f, and allowing the loading platform lifting device 4 to be firmly fixed to the loading platform 2.

[0056] The mounting plate 27b is welded to the outer surface of the reinforcing plate 27a and to the lower flange portion. The outer columns 51 (inside left and right corners of the loading platform 2) and cross members 53 (inside lower corners of the loading platform 2) of the loading platform lifting device 4 are welded to the outer surface of the mounting plate 27b. As shown in FIG. 12, the mounting plate 27b is wider than the fixed struts 29 described below. The upper end of the mounting plate 27b is located lower than the upper end of the reinforcing plate 27a. In addition, the lower end of the mounting plate 27b is located lower than the lower end of the reinforcing plate 27a, and the mounting plate 27b protrudes downward below the front and rear beams 25a, 25f (particularly the lower surfaces of the lower flange portions). This increases the number of welds and the length of the welds between the mounting plate 27b and the outer column 51, thereby preventing the outer column 51 from tipping over.

[0057] The reinforcing rib 27c is welded to the rear surface of the mounting plate 27b (the inner surface of the loading platform 2) and the lower surfaces of the lower flanges of the front and rear beams 25a and 25f. The reinforcing rib 27c is, for example, a triangular plate-like member.

[0058] The loading platform 2 may also be provided with a set plate 28 that is placed in the gap between the floor surface 21a and the upper surface of the cross member 53 of the loading platform lifting / lowering device 4. The set plate 28 is a plate member that is long in the first horizontal direction D1, and the length of the set plate 28 in the first horizontal direction D1 is the same as or greater than the width of the loading platform lifting / lowering device 4 in the first horizontal direction D1, specifically, the distance between the outer ends of the pair of outer columns 51 in the first horizontal direction D1, as shown in FIG.

[0059] As described above, the floor panel 21 of this embodiment is smaller than the underframe 20 in a plan view (viewed in the up-down direction D3), and the set plate 28 fills the gap between the upper surfaces of the front and rear beams 25a, 25f and the floor surface 21a. That is, the set plate 28 has a plate main body 28a that is approximately the same thickness as the floor panel 21.

[0060] The set plate 28 may have a substantially L-shaped cross section and may include an extension 28b extending downward from the plate main body 28a. The outer surface of the extension 28b is disposed so as to be substantially flush with the outer surface of the mounting plate 27b.

[0061] The set plate 28 is welded to the floor panel 21 and the front and rear beams 25a, 25f. Both ends of the set plate 28 in the first horizontal direction D1 are welded to the reinforcing plate 27a and the mounting plate 27b, respectively. The outer column 51 (the inner surface of the loading platform 2) and the cross member 53 (the upper corner on the inner side of the loading platform 2) of the loading platform lifting device 4 are welded to the outer surface of the set plate 28.

[0062] The bed 2 may also include fixed pillars 29 erected on the side edges of the underframe 20. The fixed pillars 29 may be erected on the set plate 28. The fixed pillars 29 are disposed adjacent to the side pillar members 24a. The outer surfaces of the fixed pillars 29 are disposed so as to be substantially flush with the outer surfaces of the mounting plates 27b.

[0063] The fixed column 29 is formed of a hollow rectangular cylinder. The cross section of the fixed column 29 may be a rectangle that is elongated in the second horizontal direction D2, as shown in Fig. 11. This reduces deflection of the fixed column 29 in the second horizontal direction D2.

[0064] The fixed pillars 29 may be welded to the set plate 28 and the floor plate 21. The outer columns 51 (the outermost corners on the inside of the loading platform 2 and the inner surface of the loading platform 2) of the loading platform lifting device 4 are fixed to the outer surfaces of the fixed pillars 29 by welding or the like. The fixed pillars 29 have approximately the same height as the side plates 24. This increases the number of welding points between the fixed pillars 29 and the outer columns 51, thereby preventing the outer columns 51 from tipping over.

[0065] [Electro-hydraulic circuit for loading platform lifting device] As shown in FIG. 13, the electric hydraulic circuit 8 of the loading platform lifting device 4 includes a hydraulic cylinder 71, a power unit 73 that drives and controls the hydraulic cylinder 71, and an electric circuit 81 that supplies electricity to the power unit 73.

[0066] The power unit 73 includes an electric motor 73a, a hydraulic pump 73b, an oil tank 73c, and a valve block 73d.

[0067] The valve block 73d integrally includes a solenoid valve 73e, a flow control valve 73f, a relief valve 73g, a check valve 73h, and the like.

[0068] The electric motor 73a is connected to a hydraulic pump 73b. The discharge side of the hydraulic pump 73b is connected to the hydraulic cylinder 71 via a main oil passage 82, and the suction side of the hydraulic pump 73b is connected to an oil tank 73c via an oil strainer. The oil tank 73c accumulates hydraulic oil. As a result, the hydraulic pump 73b is driven by the electric motor 73a and sucks hydraulic oil from the oil tank 73c and supplies it to the hydraulic cylinder 71. The upstream side of the main oil passage 82 from a check valve 73h is connected to the oil tank 73c via a relief valve 73g, and the downstream side of the main oil passage 82 from the check valve 73h is connected to the oil tank 73c via a solenoid valve 73e and a flow control valve 73f.

[0069] The electric circuit 81 includes a battery 81a, a main switch 81b, a control switch 81c, and a contactor 81d.

[0070] 1 and 2, the battery 81a may be disposed at the front end of the cargo bed 2. The battery 81a may be disposed, for example, on the step 2b. Wiring connected to the battery 81a extends rearward, for example, along the front and rear beams 25, and is connected to the contactor 81d.

[0071] The main switch 81b and the control switch 81c may be disposed on the upper side surface of the outer column 51. The control switch 81c includes an up switch and a down switch. The contactor 81d has the function of electrically connecting and disconnecting the electric motor 73a and the battery 81a.

[0072] The electrohydraulic circuit 8 may also include a bypass oil passage 83 and a hand pump 84 provided in the bypass oil passage 83.

[0073] The bypass oil passage 83 is connected to the oil tank 73c and the hydraulic cylinder 71. Specifically, one end of the bypass oil passage 83 is connected to, for example, a drain provided at the bottom of the oil tank 73c, and the other end of the bypass oil passage 83 is connected to the main oil passage 82 (downstream of the check valve 73h).

[0074] Hand pump 84 is disposed in parallel with hydraulic pump 73b. The suction side of hand pump 84 is connected to the drain of oil tank 73c, and the discharge side of hand pump 84 is connected to main oil passage 82. This allows hydraulic cylinder 71 to be manually extended by hand pump 84 instead of hydraulic pump 73b, even in an emergency such as when power unit 73 breaks down or when electricity is not supplied to power unit 73 from battery 81a.

[0075] The hand pump 84 is fixed, for example, to the side surface of the outer column 51 (see FIG. 4). The hand pump 84 may be provided with a detachable handle 84a. The hand pump 84 and the handle 84a are positioned outside the loading platform 6 relative to the path traced by the side edge of the loading platform 6 as it rises and falls.

[0076] The electro-hydraulic circuit 8 may include a stop valve 85. The stop valve 85 is arranged in parallel with the hand pump 84. The stop valve 85 is, for example, a manually operated needle valve, and in an emergency, the hydraulic cylinder 71 can be contracted by opening the stop valve 85 to return the hydraulic oil to the oil tank 73c.

[0077] [Means of Notification] The railway vehicle 1 may be equipped with a detection means 91 that detects whether the loading platform 6 is in the storage position, and an alarm means 92 that notifies the user that the loading platform 6 is not in the storage position when the detection means 91 detects that the loading platform 6 is not in the storage position. In this embodiment, the loading platform 6 being in the storage position means that the loading platform 6 is located at the upper end position and in an upright position.

[0078] The detection means 91 is not particularly limited, but may be a proximity sensor that detects whether the loading platform 6 is in the stored position. For example, as shown in FIG. 4, the proximity sensor is provided on the upper part of the outer column 51, and can detect the loading platform 6 in the stored position. The detection result of the detection means 91 is sent to a control device (not shown).

[0079] When the control device determines that the loading platform 6 is not in the stored position based on the detection result sent from the detection means 91, it sends a command to the notification means 92 to notify that the loading platform 6 is not in the stored position. Upon receiving the command from the control device, the notification means 92 notifies that the loading platform 6 is not in the stored position. This makes it possible to prevent the railway vehicle 1 from running when the loading platform 6 is not in the stored position, thereby enabling safe running.

[0080] The notification means 92 is not particularly limited, but may be a rotating light. The notification means 92 may be disposed at the upper end of the outer column 51, for example, as shown in Fig. 4. This makes it easier to see the notification means 92 because there are no obstacles around it, thereby increasing safety.

[0081] [1] From the above, it is preferable that the railway vehicle 1, as in this embodiment, comprises a loading platform 2, a plurality of wheels 31a, 31b arranged under the loading platform 2, a loading platform lifting device 4 attached to the loading platform, and a hydraulic drive source (in this embodiment, a power unit) 73 that operates the loading platform lifting device 4, and the loading platform lifting device 4 comprises a lifting mechanism 5 fixed to the loading platform 2, a loading platform 6 that is raised and lowered between the floor surface 21a of the loading platform 2 and the ground by the lifting mechanism 5, and a hydraulic actuator (in this embodiment, a hydraulic cylinder) 71 connected to the lifting mechanism 5 and raises and lowers the loading platform 6, and the hydraulic drive source (in this embodiment, a power unit) 73 comprises a hydraulic pump 73b that supplies hydraulic oil to the hydraulic actuator (in this embodiment, a hydraulic cylinder) 71, and the hydraulic pump 73b is arranged below the floor plate 21 of the loading platform 2 and in a position that overlaps with the floor plate 21 in the vertical direction D3.

[0082] According to this configuration, the hydraulic pump 73b is disposed below the floor plate 21 of the loading platform 2, so that a large space can be secured above the floor surface 21a of the loading platform 2.

[0083] [2] Furthermore, in the railway vehicle 1 of [1] above, it is preferable that the hydraulic pump 73b does not overlap the wheels 31a, 31b in the front-rear direction D1, as in this embodiment.

[0084] With this configuration, the hydraulic pump 73b does not get in the way, particularly when traveling.

[0085] [3] Furthermore, in the railway vehicle 1 of [1] or [2] above, it is preferable that the hydraulic pump 73b is arranged between the frontmost wheels 31a, 31b and the rearmost wheels 31a, 31b, as in this embodiment.

[0086] With this configuration, the hydraulic pump 73b does not get in the way, particularly when traveling.

[0087] [4] Furthermore, in any one of the railway vehicles 1 [1] to [3] above, as in this embodiment, it is preferable that the loading platform 2 comprises an underframe 20 that supports the floor plate 21 from below and a bracket 731 fixed to the underframe 20, and the hydraulic pump 73b is supported by the bracket 731.

[0088] According to this configuration, the bracket 731 is fixed to the underframe 20, which is a strength member, and therefore can appropriately support the hydraulic pump 73b, which is a heavy object.

[0089] [5] Furthermore, in the railway vehicle 1 of [4] above, as in this embodiment, it is preferable that the bracket 731 is a plate member with a J-shaped cross section that extends downward from the frame 20 closer to the center in the left-right direction D2 than the wheels 31a, 31b, and then curves toward the center.

[0090] According to this configuration, the hydraulic pump 73b is protected by having both sides and a lower portion covered by the bracket 731, making it less likely to break down.

[0091] The railway vehicle 1 is not limited to the configuration of the above-described embodiment, nor is it limited to the above-described effects. Furthermore, it goes without saying that various modifications can be made to the railway vehicle 1 without departing from the spirit of the present invention. For example, it goes without saying that one or more of the configurations, methods, etc. according to the various modified examples described below may be arbitrarily selected and adopted in the configurations, methods, etc. according to the above-described embodiment.

[0092] (A) The railway vehicle 1 according to the above embodiment is configured as a freight car. However, the railway vehicle 1 is not limited to this configuration. For example, the railway vehicle 1 may be configured as a passenger car. Furthermore, the passenger car may be a non-powered vehicle that is pulled by a locomotive or the like via a coupler.

[0093] (B) In the railway vehicle 1 according to the above embodiment, the bracket 731 is configured as a plate member with a J-shaped cross section that extends downward from the underframe 20 closer to the center in the left-right direction D2 than the wheels 31a, 31b and then curves toward the center. However, the railway vehicle 1 is not limited to this configuration. For example, the bracket 731 may be disposed outward in the left-right direction D2 than the wheels 31a, 31b. Also, for example, the bracket 731 may be a plate member with a U-shaped cross section that is fixed to the underframe 20 at two locations.

[0094] (C) In the railway vehicle 1 according to the above embodiment, the loading platform 6 is configured to be raised and lowered by a hydraulic cylinder 71. However, the railway vehicle 1 is not limited to this configuration. For example, the loading platform 6 may be configured to be raised and lowered by a hydraulic motor.

[0095] (D) In ​​the railway vehicle 1 according to the above embodiment, the platform lifting device 4 is configured to include a bypass oil passage 83 having one end connected to the oil tank 73c and the other end connected to the main oil passage 82, and a hand pump 84 provided in the bypass oil passage 83. However, the railway vehicle 1 is not limited to this configuration. For example, the hand pump 84 may be omitted.

[0096] (E) In the railway vehicle 1 according to the above embodiment, the hand pump 84 is configured to be fixed to the side surface of the outer column 51. However, the railway vehicle 1 is not limited to this configuration. For example, the hand pump 84 may be configured to be fixed to another component of the platform lifting device 4, or may be configured to be fixed to the platform 2 (the underframe 20 or the floor panel 21).

[0097] (F) In the railway vehicle 1 according to the above embodiment, the lifting mechanism 5 of the loading platform lifting device 4 is configured to be of a vertical lifting type. However, the railway vehicle 1 is not limited to this configuration. For example, the lifting mechanism may be configured to be of an arm type.

[0098] As shown in FIGS. 14 and 15, the railcar 1 may include, for example, a loading platform 2 and a loading platform lifting device 104 attached to the loading platform 2.

[0099] As shown in Figure 14, the loading platform lifting device 104 may include a lifting mechanism 105 fixed to the side edge of the loading platform 2, a loading platform 106 that moves up and down between the floor surface 21a and the ground by the lifting mechanism 105, and a hydraulic cylinder 171 that raises and lowers the loading platform 106.

[0100] The lifting mechanism 105 is fixed to, for example, the underframe 20. The lifting mechanism 105 raises and lowers the receiving platform 106 between an upper end position (a position shown by a two-dot chain line at the top of FIG. 14) and a lower end position (a position shown by a two-dot chain line at the bottom of FIG. 14). The lifting mechanism 105 may include a cross member 153 extending in the first lateral direction D1, and first and second link units 151, 152 connected to the receiving platform 106 and the cross member 153. The lifting mechanism 105 may also include a rotation drive unit 174 that rotates the receiving platform 106 relative to the lifting mechanism 105. The receiving platform lifting device 104 may also include a power unit 173 stored in the cross member 153.

[0101] For example, the receiving platform 106 may be rotated between a receiving position (the position shown by the two-dot chain line in FIG. 14) and an upright position (the position shown by the solid line in FIG. 14) by the rotation drive unit 174. As a result, when not in use, the receiving platform 106 may be positioned in an upright position between the side plates 24 arranged at intervals in the front-rear direction D1, more specifically, between the side pillar members 24a arranged at intervals in the front-rear direction D1, as shown in FIG. 15, and may also serve as a door for the platform 2.

[0102] The first link portion 151 and the second link portion 152 constitute a parallel link mechanism. As a result, the first and second link portions 151, 152 rotate about the axis at their respective base ends (the cross member 153 side), so that the receiving surface of the receiving platform 106 is maintained in a horizontal position when the receiving platform 106 moves up and down. Note that when the receiving platform 106 is located at the upper end position, the height of the receiving surface of the receiving platform 106 may be adjusted to the height of the floor surface 21a, for example.

[0103] (G) As shown in FIGS. 16 and 17, the railcar 1 may include, for example, a loading platform 2 and a loading platform lifting device 204 attached to the loading platform 2.

[0104] As shown in Figures 16 and 17, the loading platform lifting device 204 may include a lifting mechanism 205 fixed to the side edge of the loading platform 2, a loading platform 206 that moves up and down between the floor surface 21a and the ground by the lifting mechanism 205, and a hydraulic cylinder 271 that raises and lowers the loading platform 206.

[0105] The lifting mechanism 205 is fixed to, for example, the underframe 20. The lifting mechanism 205 raises and lowers the receiving platform 206 between an upper end position (a position shown by a two-dot chain line at the top of FIG. 16) and a lower end position (a position shown by a two-dot chain line at the bottom of FIG. 16). The lifting mechanism 205 may include a pipe 253 extending in the first lateral direction D1, and first and second link units 251, 252 connected to the receiving platform 206 and the pipe 253. The receiving platform lifting device 204 may also include a power unit 273 disposed in front of the lifting mechanism 205.

[0106] For example, the receiving platform 206 may rotate between a receiving position (the position shown by the two-dot chain line in FIG. 16) and an upright position (the position shown by the solid line in FIG. 16). As a result, when not in use, the receiving platform 206 may be positioned in an upright position between the side plates 24 arranged at intervals in the front-rear direction D1, more specifically, between the side pillar members 24a arranged at intervals in the front-rear direction D1, as shown in FIG. 17, and may also serve as a door for the platform 2.

[0107] The first link portion 251 and the second link portion 252 constitute a parallel link mechanism. As a result, the first and second link portions 251, 252 rotate about the base end side (the pipe 253 side) as an axis, and the receiving surface of the receiving platform 206 is maintained in a horizontal position when the receiving platform 206 moves up and down. Note that when the receiving platform 206 is located at the upper end position, the height of the receiving surface of the receiving platform 206 may be adjusted to the height of the floor surface 21a, for example.

[0108] The loading platform 2 may include a fixed support 229 that is erected on the floor surface 21a. The fixed support 229 can lock the loading platform 206 in an upright position.

[0109] (H) As shown in FIGS. 18 to 20, a railcar 1 may include, for example, a loading platform 2 and a loading platform lifting device 304 attached to the loading platform 2.

[0110] As shown in Figures 18 and 19, the loading platform lifting device 304 may include a lifting mechanism 305 fixed to the side edge of the loading platform 2, a loading platform 306 that moves up and down between the floor surface 21a and the ground by the lifting mechanism 305, and a hydraulic cylinder 371 that raises and lowers the loading platform 306.

[0111] The lifting mechanism 305 raises and lowers the receiving platform 306 between an upper end position (the position shown by the two-dot chain line in FIG. 18) and a lower end position (the position shown in FIG. 20). The lifting mechanism 305 may include a base 353 erected on the platform 2, and first and second link portions 351, 352 connected to the receiving platform 306 and the base 353. The receiving platform lifting device 304 may also include a power unit 373 arranged in front of the lifting mechanism 305.

[0112] For example, the receiving platform 306 may rotate between a receiving position (the position shown by the two-dot chain line in FIG. 18) and an upright position (the position shown by the solid line in FIG. 18). As a result, when not in use, the receiving platform 306 may be positioned in an upright position between the side plates 24 arranged at intervals in the front-rear direction D1, more specifically, between the side pillar members 24a arranged at intervals in the front-rear direction D1, as shown in FIG. 19, and may also serve as a door for the platform 2.

[0113] The first link portion 351 and the second link portion 352 constitute a parallel link mechanism. As a result, the first and second link portions 351, 352 rotate about the axis at their respective base ends (the base 353 side), so that the receiving surface is maintained in a horizontal position when the receiving platform 306 moves up and down. Note that when the receiving platform 306 is located at the upper end position, the height of the receiving surface of the receiving platform 306 may be adjusted to the height of the floor surface 21a, for example.

[0114] (I) As shown in FIG. 21, a railcar 1 may include, for example, a loading platform 2 and a loading platform lifting device 404 attached to the loading platform 2.

[0115] 21, the receiving platform lifting device 404 may include a lifting mechanism 405 fixed to the side edge of the platform 2, a receiving platform 406 that is raised and lowered between the floor surface 21a and the ground by the lifting mechanism 405, and a hydraulic cylinder 471 that raises and lowers the receiving platform 406. The receiving platform lifting device 404 may also include a base portion 453 attached to the platform 2, and a moving mechanism 407 that moves the receiving platform 406 and the base portion 453 in the second lateral direction D2.

[0116] The receiving platform 406 may include, for example, a first receiving portion 406a and a second receiving portion 406b disposed behind the first receiving portion 406a and having a front end portion (base end portion) rotatably connected to a rear end portion (tip end portion) of the first receiving portion 406a, as in the present embodiment. As a result, when the receiving platform 406 is not in use, the second receiving portion 406b is folded so as to overlap the first receiving portion 406a, as shown in FIG.

[0117] On the other hand, when the receiving platform 406 is used, the second receiving section 406b is deployed so that the receiving surface of the first receiving section 406a and the receiving surface of the second receiving section 406b are flush with each other. The number of receiving sections 406a, 406b is not particularly limited, and may be, for example, two as in this embodiment, or may be, for example, three or more, or may be, for example, only one.

[0118] The movement mechanism 407 may include, for example, a guide unit 407a that guides the base unit 453 in the second lateral direction D2, and a lateral drive unit (not shown) that moves the base unit 453 in the second lateral direction D2, as in this embodiment. The guide unit 407a is mounted on the underframe 20 by, for example, a plurality of mounting brackets 407b. The lateral drive unit is not particularly limited, and may be, for example, a cylinder that can extend and retract in the second lateral direction D2 or a motor. This causes the base unit 453 to move in the second lateral direction D2.

[0119] Therefore, when the receiving platform 406 is not in use, the receiving platform 406, the base 453, and the lifting mechanism 405 are positioned in the storage position, which is the front end position, as shown in Fig. 21. In this way, the receiving platform 406 is made compact and stored under the underframe 20. On the other hand, when the receiving platform 406 is in use, the receiving platform 406, the base 453, and the lifting mechanism 405 are positioned in the receiving position, which is the rear end position.

[0120] The lifting mechanism 405 raises and lowers the receiving platform 406 between an upper end position (a position shown by a two-dot chain line at the top of FIG. 21) and a lower end position (a position shown by a two-dot chain line at the bottom of FIG. 21). The lifting mechanism 405 may include a base portion 453, and first and second link portions 451, 452 connected to the receiving platform 406 and the base portion 453. The receiving platform lifting / lowering device 404 may also include a power unit (not shown) disposed at one end of the base portion 453 in the first horizontal direction D1.

[0121] The first link portion 451 and the second link portion 452 constitute a parallel link mechanism. As a result, the first and second link portions 451, 452 rotate about the axis at their respective base ends (the base portion 453 side), so that the receiving surface of the receiving platform 406 is maintained in a horizontal position when the receiving platform 406 moves up and down. Note that when the receiving platform 406 is located at the upper end position, the height of the receiving surface of the receiving platform 406 may be adjusted to the height of the floor surface 21a, for example.

[0122] (J) The horizontal receiving position may be a position in which the floor surface 21a of the loading platform 2 and the loading surface of the loading platform 6 are approximately flush with each other. The upright position in the vertical direction does not have to be vertical, and may be a position slightly inclined from the vertical. Compared to the area occupied by the loading platform 6 in the loading position in a plan view, the area occupied by the loading platform 6 in the upright position is smaller, allowing for more space to be secured for the loading platform 2.

[0123] (K) The inner column 52 may be omitted, and the slider 54 may be inserted directly into the outer column 51. At this time, the stopper rubber 54b abuts against the upper part of the outer column 51, and the second retainer of the slider 54 engages with the first retainer of the outer column 51.

[0124] (L) The mounting plate 27 may have substantially the same length as the opening of the front and rear beams 25. For example, the platform lifting device 4 may be fixed to the outer surface of the reinforcing plate 27a. The mounting plate 27 may also be rod-shaped, and may be fixed to both the upper flange portion and the lower flange portion of the front and rear beams 25 .

[0125] (M) The fixed support 29 may be fixed only to the floor board 21.

[0126] (N) The components of the power unit 73 are not limited to those in the above-described embodiment. The oil tank 73c may be disposed separately from the bracket 731, or may be omitted. In addition, the contactor 81 d and the battery 81 a may be fixed to the bracket 731 together.

[0127] (O) In the railway vehicle 1 according to the above embodiment, the battery 81a is configured to be placed on the step 2b at the front end of the cargo bed 2. However, the railway vehicle 1 is not limited to this configuration. For example, the battery 81a may be configured to be placed on the step 2b at the rear end of the cargo bed 2. The battery 81a may also be configured to be placed under the floor of the cargo bed 2. The power unit 73 and the battery 81 a may be provided on the floor surface 21 a of the loading platform 2 .

[0128] (P) Bracket 731 may have an L-shaped cross section or may be a simple plate extending in the vertical direction D3. Power unit 73 may be fixed to the inner side surface of bracket 731 on the loading platform 2 so as to protrude inward. The bracket 731 may also be provided with plates covering the front and rear openings. In addition, the bracket 731 may be fixed to the rear surface of the left and right beams 26 or the floor board 21. Furthermore, the orientation of bracket 731 may be rotated by 90 degrees in a plan view. In this case, bracket 731 can protect power unit 73 from foreign objects flying towards it from the front or rear while railcar 1 is traveling.

[0129] (Q) In the railway vehicle 1 according to the above embodiment, the storage position of the receiving platform 6 is an upright position along the vertical direction D3. However, the railway vehicle 1 is not limited to this configuration. For example, the receiving platform 6 may be configured by combining multiple receiving sections, and the storage position may be a position in which the multiple receiving sections are folded or contracted.

[0130] (R) In the railway vehicle 1 according to the above embodiment, the storage position of the loading platform 6 is a position in which it is located at the upper end position. However, the railway vehicle 1 is not limited to this configuration. The storage position of the loading platform 6 may be a position in which it is located between the lower end position and the upper end position, as long as it does not interfere with the running of the railway vehicle 1.

[0131] (S) In the railway vehicle 1 according to the above embodiment, the detection means 91 is configured as a proximity sensor that detects the loading platform 6 in the stowed position. However, the railway vehicle 1 is not limited to this configuration. The detection means 91 may also be a sensor that detects the state in which the lock handle 61a is engaged with the hook 61b. In other words, the detection means 91 may indirectly detect the stowed position of the loading platform 6 rather than directly.

[0132] (T) In the railway vehicle 1 according to the above embodiment, the notification means 92 is configured as a rotating light. However, the railway vehicle 1 is not limited to this configuration. For example, the notification means 92 may notify by sound or text. Furthermore, the notification means 92 may notify an information terminal (smartphone, etc.) of a worker or an information terminal (PC, smartphone, etc.) of an operations manager.

[0133] (U) In the railway vehicle 1 according to the above embodiment, the notification means 92 is configured to be disposed at the upper end of the outer column 51. However, the railway vehicle 1 is not limited to this configuration. For example, the notification means 92 may be configured to be disposed at the upper end of the fixed support pillar 29 or the side pillar member 24a of the loading platform 2. [Explanation of symbols]

[0134] 1...railroad vehicle, 2...loading platform, 2a...coupler, 2b...step, 3...bogie, 4...loading platform lifting device, 5...lifting mechanism, 6...loading platform, 7...drive unit, 8...electrical hydraulic circuit, 20...underframe, 21...floor panel, 21a...loading platform floor surface, 22...front panel, 23...rear panel, 24...side panel, 24a...side pillar member, 25...front and rear beams, 25a...front and rear beams, 25b...front and rear beams, 25c...front and rear beams, 25d...front and rear beams, 25e...front and rear beams, 25f...front and rear beams, 26...left and right beams, 27...mounting plate, 27a...reinforcing plate, 27b...mounting plate, 27c...reinforcing rib, 28...set plate, 28a...plate main body, 28 b...extension, 29...fixed support, 31a...wheel, 31b...wheel, 32...axle, 33a...suspension device, 33b...suspension device, 51...outer column, 51a...top plate, 51b...intermediate plate, 51c...outer slit, 51d...guide roller, 51e...stopper, 52...inner column, 52a...inner slit, 52b...bracket, 52c...guide roller, 52d...bracket, 52e...elastic stopper, 52f...base plate, 53...cross member, 53a...cross member main body, 53b...cover main body, 54...slider, 54a...upper and lower guide roller, 54b...stopper rubber, 54c ...Bracket, 54d...Pin, 54e...Stay, 54f...Stopper bolt, 55...Safety bar, 61...Securing device, 61a...Lock handle, 61b...Hook, 71...Hydraulic cylinder, 71a...Cylinder barrel, 71b...Rib plate, 71c...Cylinder rod, 72...Wire linkage mechanism, 73...Power unit, 73a...Electric motor, 73b...Hydraulic pump, 73c...Oil tank, 73d...Valve block, 73e...Solenoid valve, 73f...Flow control valve, 73g...Relief valve, 73h...Check valve, 81...Electrical circuit, 81a...Bar battery, 81b...main switch, 81c...control switch, 81d...contactor, 82...main oil passage, 83...bypass oil passage, 84...hand pump, 84a...handle, 85...stop valve, 91...detection means, 92...alarm means, 104...load receiving platform lifting device, 105...lifting mechanism, 106...load receiving platform, 151...first link portion, 152...second link portion, 153...cross member, 171...hydraulic cylinder, 173...power unit, 174...rotation drive portion, 204...load receiving platform lifting device, 205...lifting mechanism, 206...load receiving platform, 229...fixed support, 251...first link portion,252...second link portion, 253...pipe, 271...hydraulic cylinder, 273...power unit, 304...load receiving platform lifting device, 305...lifting mechanism, 306...load receiving platform, 351...first link portion, 352...second link portion, 353...base, 371...hydraulic cylinder, 373...power unit, 404...load receiving platform lifting device, 405...lifting mechanism, 406...load receiving platform, 406a...first receiving portion, 406b...second receiving portion, 407...moving mechanism, 407a...guide portion, 407b...mounting bracket, 451...first link portion, 452...second link portion, 453...base portion , 471...hydraulic cylinder, 720a...first top fixed sheave, 720b...second top fixed sheave, 721a...first movable sheave, 721b...second movable sheave, 722a...first side fixed sheave, 722b...second side fixed sheave, 722c...third side fixed sheave, 723...guide rail, 724...bracket, 725...left system wire, 725a...end, 726...right system wire, 726a...end, 731...bracket, 732...reinforcing plate, 733...reinforcing rib, D1...first horizontal direction, D2...second horizontal direction, D3...vertical direction, R...rail,

Claims

1. a loading platform; a plurality of wheels disposed under the loading platform; a loading platform lifting / lowering device attached to the loading platform; and a hydraulic drive source that operates the loading platform lifting / lowering device; The loading platform lifting device includes a lifting mechanism fixed to the loading platform, a loading platform that is raised and lowered between the floor of the loading platform and the ground by the lifting mechanism, and a hydraulic actuator that is connected to the lifting mechanism and raises and lowers the loading platform, the hydraulic drive source includes a hydraulic pump that supplies hydraulic oil to the hydraulic actuator; The hydraulic pump is disposed below the floor plate of the loading platform and overlaps with the floor plate in the vertical direction.

2. The railway vehicle according to claim 1 , wherein the hydraulic pump does not overlap the wheel in the longitudinal direction.

3. The railway vehicle according to claim 1 or 2, wherein the hydraulic pump is disposed between the frontmost wheel and the rearmost wheel.

4. The loading platform includes an underframe that supports the floor panel from below, and a bracket fixed to the underframe, The railway vehicle according to claim 1 or 2, wherein the hydraulic pump is supported by the bracket.

5. 5. The railway vehicle according to claim 4, wherein the bracket is a plate member having a J-shaped cross section that extends downward from the underframe on a side closer to the center in the left-right direction than the wheels and then curves toward the center.

Images