Temporary bogie for railway vehicles

Abstract

To provide a temporary truck for a railway vehicle which can increase a lift-up amount and has low total height when it is lowered.SOLUTION: In a temporary truck 100 for a railway vehicle provided with a lifting device used in an inspection and repair factory for performing inspection and repair to be able to lift and lower a vehicle body 10, the lifting device extends a shaft in multiple stages to lift up the vehicle body 10 because it is a hydraulic cylinder 120 of a telescopic structure and a stroke of the hydraulic cylinder 120 is longer than the total length of the hydraulic cylinder 120 itself, and can move the vehicle body 10 with low center of gravity in moving the vehicle body with the shaft contracted.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a temporary bogie for a railway vehicle that transports the railway vehicle within an inspection and repair shop, and more specifically to a technique for lowering the overall height of the temporary bogie. [Background technology]

[0002] When inspecting and maintaining railcars at the inspection and repair factory, the bogie is removed from the car body and placed on a temporary bogie, which is then inspected and maintained. Two temporary bogies are used for this purpose, one at the front and one at the back of each car body. The car body can be loaded onto the temporary bogie and run on rails laid in the factory. In addition, the height of the railcar can be changed by installing a lifting device, so that underfloor equipment installed on the bottom of the car body can be removed and installed while the car body is lifted up. Such technologies have been proposed in various forms in the past.

[0003] Patent Document 1 discloses a technology related to a temporary bogie for railway vehicles. It shows a configuration in which hydraulic circuits are connected independently to each hydraulic cylinder linked to a carbody support platform that holds the body of the railway vehicle, and each hydraulic circuit is independently operated to adjust the hydraulic pressure supplied to and discharged from each hydraulic cylinder, enabling the body of the railway vehicle to be raised and lowered in a parallel state while synchronizing the expansion and contraction of each hydraulic cylinder.

[0004] Patent Document 2 discloses a technology related to a temporary bogie for transporting car bodies. A lifting support platform that supports the car body with four cylinders arranged in an eight-shape is attached to a running underframe, a guide pillar with a square cross section is provided in the center of the underside of this lifting support platform, and a guide receiver into which this guide pillar is inserted and slides, and a hydraulic supply device that supplies oil to the cylinder are attached to the bogie. To transport the bogie, a self-propelled temporary bogie with a driving device attached to the underframe to give it a running function and an accompanying temporary bogie without a running function are used. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 10-119773 [Patent Document 2] Japanese Patent Application Publication No. 5-131901 Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is a tendency for transformers and compressors to be installed in the space under the floor of the car body to become large and heavy, and piping and wiring are also becoming more complicated, so there are cases where it is desired to increase the amount of lifting up of the car body. When using the technologies described in Patent Documents 1 and 2, if one tries to increase the amount of lifting up of the car body, the overall length of the cylinder used for lifting up becomes longer, so it is necessary to increase the overall height of the temporary bogie.

[0007] If the overall height of the temporary trolley becomes high when the base provided at the upper end of the cylinder, which is the temporary trolley's lifting device, is at the lowered end, it becomes difficult to load the car body onto the temporary trolley, and the overall center of gravity becomes higher when the car body is transported, increasing the risk of it tipping over, which is undesirable.

[0008] SUMMARY OF THE PRESENT INVETION The present invention has an object to solve such problems and to provide a temporary bogie for railway cars which can increase the amount of lift-up and has a low overall height when lowered. [Means for solving the problem]

[0009] In order to achieve the above object, a temporary bogie for a railway vehicle according to one aspect of the present invention has the following features.

[0010] (1) A temporary bogie for a railway vehicle in which the car body can be raised and lowered using a lifting device provided on a base, The lifting device is a single-acting hydraulic cylinder having a telescopic structure with a multi-stage rod; It is characterized by:

[0011] According to the aspect described in (1) above, the stroke of the single-acting hydraulic cylinder can be made longer than the overall length, so the overall height and center of gravity of the temporary bogie for railway vehicles can be lowered when it is lowered, and it becomes possible to reduce the risk of the temporary bogie tipping over when the car body is placed on it. Although double-acting hydraulic cylinders are often used for temporary bogies because their structure can be simplified, the hydraulic cylinder structure of the present invention is a single-acting type, so that the center of gravity is closer to the cap side of the hydraulic cylinder, and a telescopic structure is adopted, achieving both a long stroke and a low floor for the temporary bogie when it is lowered.

[0012] (2) In the temporary bogie for a railway vehicle according to (1), The single-acting hydraulic cylinder includes a first cylinder at one end of the width direction of the base and a second cylinder at the other end, the first cylinder being held by a rod side end of each cylinder portion; is preferred.

[0013] According to the aspect described in (2) above, the single-acting hydraulic cylinder is disposed on the outer side in the width direction of the temporary carriage, which has the effect of improving maintainability. When performing maintenance on the hydraulic cylinder, the work can be performed by accessing it from the side of the temporary carriage. In addition, since the structure supports the rod side of the hydraulic cylinder, i.e., the side where the rod protrudes, it is easy to access the hydraulic oil supply port provided on the cap side, which also contributes to improving maintainability.

[0014] (3) In the temporary bogie for a railway vehicle according to (1) or (2), The guide mechanism provided on the base is a guide rod having a telescopic structure, being disposed inside the single-acting hydraulic cylinder; is preferred.

[0015] According to the aspect described in (3) above, the guide mechanism employs a telescopic structure similar to the single-acting hydraulic cylinder, so that it is possible to accommodate cases where the lift-up amount of the temporary carriage is increased. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a schematic side view of the temporary carriage in the present embodiment. [Diagram 2] FIG. 2 is a schematic front view of the temporary carriage according to the present embodiment. [Diagram 3] FIG. 2 is a perspective view of a temporary carriage according to the present embodiment. [Figure 4] FIG. 2 is a schematic diagram of the vehicle body in the embodiment, in which the vehicle body is lifted up by a temporary bogie. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] First, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a schematic side view of a temporary bogie 100 in this embodiment. Fig. 2 shows a schematic front view of the temporary bogie 100. Fig. 3 shows a perspective view of the temporary bogie 100. The temporary bogie 100, which is used to move a railroad car body 10 within a factory, is made up of a lower base 110 equipped with wheels 160 and an upper support 130 that supports the car body 10.

[0018] The lower base 110 is provided with a single-acting hydraulic cylinder 120 that employs a telescopic structure as a lifting device and has the function of raising and lowering the upper support 130. The hydraulic cylinder 120 is set so that the upper support 130 can be lifted up by 600 mm in three stages in this embodiment by extending a multi-stage rod 125 (see FIG. 4), but the stroke of the hydraulic cylinder 120 can be further extended as necessary.

[0019] The lower base 110 is equipped with guide shafts 140 (first guide shaft 140a and second guide shaft 140b), and employs a telescopic structure similar to the hydraulic cylinder 120. The lower base 110 is configured by combining horizontal beams 111 and vertical beams 112 made of square steel pipes in a crisscross pattern. The horizontal beams 111 are arranged perpendicular to the rails 20 laid on the floor surface of the factory, and the vertical beams 112 are arranged parallel to the rails 20. Crosspieces 113 are placed between the vertical beams 112 on the underside and welded.

[0020] The lower base 110 is provided with four wheels 160, allowing it to run on rails 20 laid on the floor of the factory. The wheels 160 are disposed inside the vertical beams 112 and held by bearings (not shown). The wheels 160 are driven by a drive motor (not shown).

[0021] As shown in FIG. 2, the hydraulic cylinders 120 and the guide shafts 140 are arranged on each side of the lower base 110, specifically, the hydraulic cylinders 120 (first cylinder 120a and second cylinder 120b) are arranged on the outside (outside in the vehicle width direction) and the guide shaft 140 is arranged between them.

[0022] The first cylinder 120a is disposed at one end of the cross beam 111, and the second cylinder 120b is disposed at the other end of the cross beam 111 so as to be farthest from each other. The cross beam 111 is set to a width equal to that of the car body 10 to be lifted up, and the hydraulic cylinder 120 is positioned so as to be disposed immediately below the side structure.

[0023] The hydraulic cylinder 120 is a single-acting hydraulically driven cylinder employing a telescopic structure, with a multi-stage rod that extends and retracts by hydraulic pressure. The hydraulic cylinder 120 is attached such that the rod side end of the cylinder part of the hydraulic cylinder 120 is held by the lower base 110. More specifically, it is rotatably held by a bracket 114 that is placed across the cross beam 111. Since one hydraulic cylinder 120 is held by two brackets 114, a total of four brackets 114 are fixed to the temporary carriage 100.

[0024] The upper support 130 moves up and down by the extension and contraction of the hydraulic cylinder 120, and this movement is guided by a guide shaft 140 attached to a lower base 140. The guide shaft 140 also has a telescopic structure to match the stroke of the hydraulic cylinder 120. The hydraulic cylinder 120 is operated by hydraulic pressure sent by a connected hydraulic control device 115. The first cylinder 120a and the second cylinder 120b are controlled to keep the top surface of the upper support 130 horizontal.

[0025] The upper support 130 is elongated in the rail width direction as shown in Fig. 2, and has bolster members 135 disposed on both upper sides thereof, which come into contact with and support the lower part of the car body 10. Meanwhile, a hydraulic cylinder 120 and a guide shaft 140 are fixed to the lower surface of the upper support 130. Note that the figure shows a configuration in which the height can be changed by using multiple bolster members 135 (two in this embodiment). This does not prevent these from being made into an integrated member.

[0026] The hydraulic control device 115 that controls the hydraulic cylinder 120 is fixed to the crosspiece 113 of the lower base 110. The hydraulic control device 115 is connected to a control panel 116 provided on the side of the provisional carriage 100. For the sake of explanation, the hydraulic control device 115 is omitted in FIG. 3. Hydraulic control is performed by operating the control panel 116. Although not shown, operation may be performed using a remote control device such as a teaching pendant. In addition, when cooperative control with the paired provisional carriage 100 is performed, a separate communication cable may be connected.

[0027] The temporary bogie 100 for railway cars of this embodiment has the above-mentioned configuration, and therefore provides the following actions and effects.

[0028] First, it is possible to provide a temporary bogie 100 with a large lift-up amount and a low overall height h. This is because the temporary bogie 100 for a railway vehicle that is equipped with a lifting device and can raise and lower the car body 10 is characterized in that the lifting device is a telescopic hydraulic cylinder 120 having a multi-stage rod 125.

[0029] 4 is a schematic diagram showing the state in which the car body 10 is lifted up by the temporary bogie 100 in a solid line and the state during transportation in a two-dot chain line. When the car body 10 is transported by the temporary bogie 100, the hydraulic cylinder 120 is at the lowered end, and after moving to a predetermined location, the temporary bogie 100 is stopped and the car body 10 is lifted up by the hydraulic cylinder 120. By employing a telescopic structure for the hydraulic cylinder 120 and the guide shaft 140, it is possible to lengthen the stroke of the hydraulic cylinder 120, and as a result, it is possible to increase the amount of lifting up of the car body 10 while keeping the overall height h of the temporary bogie 100 low.

[0030] When maintaining the underside of the car body 10, a sufficient stroke ST is required to ensure sufficient underfloor working space. On the other hand, when moving the car body 10 on the temporary bogie 100, it is desirable that the overall height h of the temporary bogie 100 is as low as possible. This is because, as described in the problem, it is desirable to reduce the risk of the car body 10 tipping over during transportation. It is desirable to be able to transport the car body 10 with a low center of gravity, and for this purpose, it is necessary to shorten the overall length of the hydraulic cylinder 120 when contracted as much as possible. By employing a telescopic structure for the hydraulic cylinder 120, the shaft can be extended in multiple stages, which ultimately makes it possible to lower the overall height h of the car body 10.

[0031] In addition, the hydraulic cylinder 120 is suspended from a bracket 114 that is hung from a cross beam 111 of the lower base 110, which allows the overall length of the hydraulic cylinder 120 to be increased. In addition, the use of a single-acting type hydraulic cylinder 120 instead of a double-acting type also contributes to lowering the overall height h of the temporary cart 100.

[0032] Furthermore, the use of a single-acting hydraulic cylinder 120 also contributes to lowering the center of gravity of the temporary cart 100. This is because there is no need to provide a supply port for supplying hydraulic pressure to the rod side of the hydraulic cylinder 120 where the rod protrudes, and the supply port is provided on the cap side on the opposite side, resulting in the center of gravity of the hydraulic cylinder 120 moving to the lower side of the temporary cart 100. In this way, the overall height h of the temporary cart 100 is lowered and the center of gravity is lowered, making it possible to reduce the risk of the cart 10 tipping over when transporting the cart 10. A lower center of gravity is also advantageous when lifting up the cart 10.

[0033] Furthermore, by disposing the hydraulic cylinder 120 at the end of the cross beam 111, the maintainability of the temporary carriage 100 is improved. Since the hydraulic cylinder 120, which is a hydraulic device, requires more frequent maintenance than the guide shaft 140, disposing the hydraulic cylinder 120 on the outside of the guide shaft 140 makes it easier to access, and therefore the maintainability can be improved.

[0034] Although the temporary bogie 100 for a railway vehicle according to the present invention has been described above, the present invention is not limited thereto, and various modifications are possible within the scope of the present invention. For example, the number of stages of the telescopic hydraulic cylinder 120 and the guide shaft 140 may be increased. In addition, although the hydraulic control device 115 is provided on the lower base 110, when large-diameter wheels 160 are used, the hydraulic control device 115 may be attached to the underside of the lower base 110. [Explanation of symbols]

[0035] 10. Body 100 Temporary dolly 110 Lower Base 120 Hydraulic Cylinder 125 Rod 130 Upper Support 140 Guide shaft

Claims

1. A temporary bogie for a railway vehicle in which a car body can be raised and lowered using a lifting device provided on a base, The base is A longitudinal beam arranged parallel to the rail; The rails and the cross beams arranged perpendicular to each other are configured in a lattice shape, The lifting device is a single-acting hydraulic cylinder having a telescopic structure with a multi-stage rod; The single-acting hydraulic cylinder is A first cylinder is provided at one end of the cross beam in the width direction, which is located on the outer side of the vertical beam, and a second cylinder is provided at the other end. The rod end of each cylinder portion is held in place. A temporary bogie for railway vehicles, characterized by:

2. The temporary bogie for a railway vehicle according to claim 1, The cross beam is set to a width equal to that of the vehicle body, the single-acting hydraulic cylinder is disposed immediately below and adjacent to a side structure of the car body; A temporary bogie for railway vehicles, characterized by:

3. The temporary bogie for a railway vehicle according to claim 1 or 2, The guide mechanism provided on the base is a guide rod having a telescopic structure and is disposed on the inner side of the cross beam of the single-acting hydraulic cylinder in the width direction. A temporary bogie for railway vehicles, characterized by:

Images