Carrying device

Abstract

To provide a carrying device that carries a wheel shaft and a heavy load including the wheel shaft.SOLUTION: A carrying device 1 that carries a wheel shaft 2 or a heavy load including the wheel shaft 2 along a rail includes: a support part 3 that supports an axle 21 of the wheel shaft 2; and a running main body 4 that includes a wheel 40 which moves the support part 3. The support part 3 includes a bearing mechanism 30 that rotatably supports the axle 21, and receives a part of the weight of the wheel shaft 2.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a transport device for transporting wheelsets (not limited to individual wheelsets but including assembled bogies) and heavy objects including wheelsets (hereinafter referred to as wheelsets, etc.). [Background technology]

[0002] Railway vehicles have wheelsets that support the car body via bearings. In the inspection and repair of railway vehicles, it is necessary to transport the wheelsets, etc., separated from the car body, to a repair site, etc., but it is not easy to transport the wheelsets, which are heavy objects weighing 1 to 2 tons (individual weight). In particular, when transporting the wheelsets, etc. manually, the physical burden on the worker is large and there is a risk of hands and feet being pinched or caught. Therefore, a transport device is known that reduces the physical burden on the worker and efficiently transports the wheelsets to another location (for example, see Patent Document 1).

[0003] The transport device described in Patent Document 1 has a moving device arranged at a position facing the end of the ground rail through which the wheel set is brought in or out, and a transport cart that travels in a direction perpendicular to the ground rail to transport the wheel set. The moving device has a fork portion that holds the wheel set, a forward / backward sliding mechanism that slides the fork portion back and forth, and a lifting mechanism that raises and lowers the fork portion, and lifts the wheel set and transfers it to the transport cart. The transport cart then transports the wheel set to a location separate from the ground rail.

[0004] Furthermore, Patent Document 2 describes a transport device capable of transporting large objects. The transport device described in Patent Document 2 includes a single axle, a bell crank, and a platform for placing the object. The platform is attached to the tip of the bell crank so that it can pitch and yaw, allowing the object to be transported to any desired location. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-58222 A [Patent Document 2] JP 2019-196054 A Summary of the Invention [Problem to be solved by the invention]

[0006] The transport device described in Patent Document 1 was large and expensive because it consisted of a moving device that lifts the axles and a transport cart that transports the axles in a direction perpendicular to the ground rail on which the axles are placed. In particular, when transporting the axles, the transport cart must run parallel to the axial direction of the axles, and it could not be used when there was not enough space around the ground rail. In addition, the operation was complicated and it was not possible to transport efficiently.

[0007] The conveying device described in Patent Document 2 uses the principle of leverage to lift the object to be transported, making it difficult to manually lift axles weighing 1 to 2 tons. Therefore, it is impossible to lift and transport axles using this conveying device, and an overhead crane or the like must be used to transport the axles, leading to an increase in the amount of work and transport time.

[0008] Therefore, there is a demand for a small, lightweight transport device that is simple to operate and capable of transporting wheel sets efficiently. [Means for solving the problem]

[0009] The characteristic configuration of the conveying device of the present invention is that it is a conveying device that transports a wheel set or a heavy object including the wheel set along a rail, and is equipped with a support part that supports the axle of the wheel set, and a running body having wheels that move the support part, and the support part has a bearing mechanism that rotatably supports the axle and receives part of the load of the wheel set.

[0010] The support part of the conveying device in this configuration has a bearing mechanism that rotatably supports the axle of the wheel axle, and receives part of the load of the wheel axle. Therefore, when power is applied to the conveying device, the power is transmitted to the axle via the bearing mechanism, and the axle rotates in the same direction as the rotation direction of the wheels of the traveling body, so the wheel axle moves along the direction of movement of the conveying device. In this way, since it is a simple configuration in which part of the load of the wheel axle is supported and the wheel axle is rotated by applying power to the conveying device to convey it, the operation is not complicated. In addition, compared to the case where the wheel axle is lifted and conveyed, the conveying device in this configuration receives part of the load of the wheel axle, so the load applied to the support part and the traveling body can be significantly reduced, and the conveying device can be made smaller and lighter. This makes it easier to handle the conveying device, and the wheel axle can be conveyed using the conveying device even if there is not enough space around the wheel axle. Therefore, the physical burden on the worker can be reduced, and the worker does not need to get closer than necessary to the wheel axle, so it is possible to prevent hands and feet from getting caught in the wheels. In addition, the conveying work can be performed with less manpower, so the efficiency of the conveying work can be improved.

[0011] A further characteristic feature of the present invention is that the traveling body has a lifting mechanism that lifts and lowers the support part relative to the axle.

[0012] When transporting the axle, the support part is inserted under the axle, and then the lifting mechanism is used to raise the support part until part of the load of the axle is placed on the support part, thereby supporting the axle. When the transport of the axle is completed, the lifting mechanism is used to lower the support part, and the transport device is removed from the axle. This makes it possible to reduce the vertical dimensions of the running part and support part when the support part is not raised (when the support part is at the lowest position), lowering the center of gravity of the transport device and stabilizing travelling performance. Also, it becomes possible to insert the support part under the axle, even if the wheel diameter of the axle is small and the distance between the axle and the ground is short.

[0013] A further characteristic configuration according to the present invention is that the bearing mechanism includes a pair of rotating rollers that are provided symmetrically about the axle when viewed in the axial direction of the axle.

[0014] If the bearing mechanism is a pair of rotating rollers that are symmetrically disposed about the axle when viewed in the axial direction of the axle, it is possible to support and rotate the axle along the tangent of the rotating rollers regardless of the axle diameter, which allows a single conveying device to convey multiple types of axles with different axle diameters.

[0015] A further characteristic feature of the present invention is that the support portion has a rotation mechanism capable of rotating the wheel set relative to the running body.

[0016] By having a rotation mechanism that allows the support part to rotate with respect to the traveling body, even if the traveling direction of the traveling body and the traveling direction of the wheel set are misaligned, the wheel set can be steered and straight-line stability can be improved. In other words, the wheel set can be transported smoothly without competing with the conveying device by utilizing the inertial force of the wheel set. With this configuration, when inserting the support part under the axle, it is not necessary to strictly align the traveling direction of the traveling body and the traveling direction of the wheel set, so the operation is not complicated.

[0017] A further characteristic feature of the present invention is that the running body has a drive mechanism that imparts a driving force to assist running.

[0018] By having a driving mechanism that applies a driving force to assist the running of the running body, it is possible to reduce the force that needs to be applied to the running body to rotate the wheelsets. This makes it possible for even people with weak strength (elderly people, women, etc.) to transport the wheelsets by themselves. In addition, by increasing the driving force, it becomes possible to transport heavy objects that include multiple wheelsets or assembled dollies, etc.

[0019] A further characteristic feature of the present invention is that the running body has auxiliary wheels for preventing the running body from coming off the track.

[0020] If there are steps or clearances on the road along which the conveying device travels, the wheels of the traveling body may stumble over the steps, making smooth transportation impossible. Therefore, if the traveling body has auxiliary wheels, the auxiliary wheels will support the traveling body even if the wheels of the traveling body stumble over the steps, making it possible to transport the wheel set smoothly. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a plan view of the transport device according to the first embodiment. [Diagram 2] FIG. 2 is a side view of the transport device according to the first embodiment. [Diagram 3] FIG. 2 is a rear view of the transport device according to the first embodiment. [Figure 4] FIG. 2 is a side view of the transport device according to the first embodiment. [Diagram 5] FIG. 11 is a side view of a transport device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of a conveying device according to the present invention will be described with reference to the drawings. In this embodiment, a conveying device for conveying axles will be described as an example of a conveying device. However, the present invention is not limited to the following embodiment, and various modifications are possible without departing from the spirit of the present invention.

[0023] [First embodiment] A conveying device 1 for conveying a wheel set 2 according to the first embodiment will be described with reference to Figs. 1 to 4. Fig. 1 is a plan view of the conveying device 1, Fig. 2 is a side view of the conveying device 1, and Fig. 3 is a rear view of the conveying device 1. Fig. 4 is a side view of the conveying device 1 when the wheel set 2 is supported. The conveying device 1 includes a support part 3 for supporting the wheel set 2 and a running body 4. The wheel set 2 moves along a rail R laid on the ground by operating the conveying device 1. The rail R is a track rail for carrying the wheel set 2 in and out. Hereinafter, the traveling direction of the wheel set 2 is referred to as the X direction, the direction perpendicular to the X direction in a plan view as the Y direction, and the height direction as the Z direction. The wheel set 2 is composed of the bogie of the railway vehicle itself, or only the axle 21 and wheels 20, 20 included in the bogie.

[0024] As shown in FIG. 1 and FIG. 2, the traveling body 4 has wheels 40, a lifting mechanism 41, a handle 42, and a plate portion 43 to which the support portion 3 is fixed. The traveling body 4 can be a ready-made dolly, for example, a hand pallet truck (BM08M-1F, Sugiyasu Co., Ltd.). The dimension (width) of the plate portion 43 in the Y direction is shorter than the distance between the wheels 20, 20 of the axle 2, and is preferably 250 to 500 mm. If the width of the plate portion 43 is shorter than the distance between the wheels 20, 20, the conveying device 1 can be inserted below the axle 21 of the axle 2 along the traveling direction of the axle 2, so that even if there is no large space around the axle 2, the axle 2 can be conveyed using the conveying device 1. In addition, the conveying device 1 can be made smaller. The plate portion 43 of the traveling body 4 is rectangular in plan view, and the dimension in the X direction is longer than the dimension in the Y direction. The lifting mechanism 41 and the handle 42 are connected to one end of the plate portion 43 in the X direction via a standing portion 44 .

[0025] The movement of the conveying device 1 is performed by transmitting power to the wheels 40. In this embodiment, the operator grasps the handle 42 and pushes or pulls the conveying device 1, so that power is applied to the wheels 40, and the conveying device 1 moves forward or backward along the X direction. The wheels 40 have wheels 40a connected to the lifting mechanism 41 via a connecting member 49, and wheels 40b provided on the other end side of the plate part 43 opposite to the end where the standing part 44 is provided. Two wheels 40a are arranged symmetrically with respect to the central axis C1 in the X direction of the plate part 43, and two wheels 40b are arranged on the other end side of the plate part 43, two on either side of the central axis C1, for a total of four wheels symmetrically with respect to the central axis C1. In this embodiment, the separation distance between the wheels 40a, 40a is longer than the separation distance between the wheels 40b, 40b, but may be the same. The wheel diameters of the wheels 40a and 40b may be different or the same, and may be set to a wheel diameter required according to the unevenness of the traveling surface. The plate portion 43 overlapping with the wheels 40b in a plan view is provided with an opening 48 that accommodates a part of the wheels 40b when the plate portion 43 is located at the lowest position by operation of the lifting mechanism 41, which will be described later. That is, when the plate portion 43 is located at the lowest position, a part of the wheels 40b is accommodated in the opening 48.

[0026] The support part 3 that supports the wheel set 2 is disposed on the upper surface of the plate part 43, and the support part 3 is fixed to the upper surface of the plate part 43 by a bolt 51. The support part 3 has a bearing mechanism 30, a rotation mechanism 31, a support member 32, and a plate part 33. The plate part 33 is a substantially square flat plate with four corners cut out. The dimension of the plate part 33 in the Y direction is slightly longer than the dimension of the plate part 43 in the Y direction, so that the plate part 33 protrudes from the plate part 43 in the Y direction. The plate part 33 is fixed to the plate part 43 by passing the bolts 51 through bolt holes opened in the four corners. The plate part 33 can be formed using a steel material or the like.

[0027] The support member 32 is disposed on the upper surface of the plate member 33. The support member 32 is, for example, an H-shaped steel connected in parallel in the Y direction, and its upper and lower surfaces are flat plates in a rectangular parallelepiped shape. The dimensions of the support member 32 in the X and Y directions are shorter than the dimensions of the plate portion 43 in the X and Y directions. The dimension of the support member 32 in the Z direction is preferably 100 to 200 mm. The support member 32 may be a box-shaped structure having a rectangular parallelepiped or cubic shape, and may have any structure as long as it can bear the load of the wheel set 2, but from the viewpoint of reducing the weight of the conveyor device 1, it is preferable that the support member 32 has a hollow structure. In addition, the plate member 33 and the support member 32 may be integrally configured. The support member 32 is disposed on the upper surface of the plate member 33 so that the center of the plate member 33 and the center of the support member 32 overlap, and is fixed to the plate member 33 by the bolt 52. That is, a bolt hole for passing the bolt 52 is provided on the lower surface of the support member 32 that contacts the plate member 33.

[0028] The rotation mechanism 31 is composed of a rotation table 31a and a rotation shaft 31b. The rotation table 31a is disposed so as to face the upper surface of the support member 32 while being suspended a certain height above the upper surface of the support member 32. The rotation shaft 31b is inserted through the center of the support member 32 and the rotation table 31a, and the rotation table 31a is configured to be rotatable around the rotation shaft 31b. The rotation shaft 31b stands upright in a direction almost vertical to the support member 32. Therefore, the rotation table 31a rotates in a plane parallel to the plate portion 43.

[0029] A bearing mechanism 30 that rotatably supports the wheels 20 of the wheel set 2 is disposed on the upper surface of the rotating table 31a. The bearing mechanism 30 may be integral with the rotating mechanism 31, or may have a bearing portion 30a connected to the rotating table 31a via a bolt or the like. A plurality of rotating rollers 30b are rotatably installed on the bearing portion 30a. That is, the bearing mechanism 30 in this embodiment is a rolling bearing having rotating rollers 30b. In this embodiment, a total of eight rotating rollers 30b are provided, and as shown in FIG. 3, two rotating rollers 30b connected in parallel in the Y direction form one set. As shown in FIG. 1, the rotating rollers 30b are disposed symmetrically in two sets across the central axis C1 and two sets across the central axis C2 in the Y direction. In addition, the rotating shaft 31b in the rotating mechanism 31 is also inserted through the center of the bearing portion 30a.

[0030] The central axis C3 of the bearing mechanism 30 in the Z direction coincides with the axial direction of the rotating shaft 31b. When the support unit 3 supports the wheel axle 2, as shown in FIG. 4, a pair of rotating rollers 30b are arranged symmetrically with respect to the wheel axle 21 when viewed in the Y direction (when viewed in the axial direction of the wheel axle 21). That is, when the support unit 3 supports the wheel axle 2, the central axis of the wheel axle 21 exists on the central axis C3 of the bearing mechanism 30. The separation distance between the rotating rollers 30b, 30b in the X direction can be appropriately determined according to the diameter of the wheel axle 21, and is preferably 100 mm to 200 mm. The separation distance between the rotating rollers 30b, 30b facing each other across the central axis C1 in the Y direction can also be appropriately determined, but the greater the separation distance, the more stable the wheel axle 21 can be supported.

[0031] The lifting mechanism 41 raises or lowers the plate portion 43 in the Z direction. As the plate portion 43 rises, the support portion 3 arranged on the upper surface of the plate portion 43 comes into contact with the axle 21 of the wheel set 2, and becomes able to bear part of the load of the wheel set 2. FIG. 2 shows a case where the plate portion 43 is at the lowest position, and FIG. 4 shows a case where the support portion 3 bears part of the load of the wheel set 2. When the plate portion 43 is at the lowest position, there is a certain distance between the rotating roller 30b and the axle 21 of the wheel set 2. In other words, the height of the support portion 3 in the Z direction is lower than the height of the axle 21 in the Z direction.

[0032] The power of the lifting mechanism 41 can be selected from mechanical, hydraulic, and air-operated types. In this embodiment, the power of the lifting mechanism 41 is hydraulic, and by tilting the handle 42 in the Y direction, the lifting mechanism 41 extends the shaft portion 41a upward in the Z direction, and the plate portion 43 rises. The wheels 40b provided on the plate portion 43 descend below the plate portion 43 as the plate portion 43 rises, so that the plate portion 43 rises while remaining horizontal to the ground. The configuration of the lifting mechanism for the wheels 40b is publicly known, so a detailed description will be omitted. When the plate portion 43 is to be lowered, the plate portion 43 can be lowered by operating the operating lever 42a provided on the handle 42 to release the pressure. The lifting mechanism 41 may be designed to raise only the support portion 3 instead of the plate portion 43.

[0033] Next, a method for transporting the wheel set 2 using the transport device 1 will be described. First, with the plate portion 43 in the lowest position (pressure applied to the lifting mechanism 41 is released), the operator inserts the transport device 1 between the wheels 20, 20 of the wheel set 2 and below the axle 21. At this time, since the plate portion 43 is in the lowest position, the support portion 3 and the axle 21 of the wheel set 2 do not come into contact. The operator inserts the transport device 1 to a position where the central axis of the axle 21 and the central axis C2 of the bearing mechanism 30 overlap.

[0034] After that, the operator extends the shaft portion 41a upward in the Z direction by the lifting mechanism 41 to lift the plate portion 43 upward in the Z direction, and brings the rotating roller 30b into contact with the axle 21. The lifting mechanism 41 lifts the plate portion 43 until a load is applied to the support portion 3. The operation of lifting the plate portion 43 may be stopped when the stress applied to the handle 42 becomes large or when the load applied to the support portion 3 exceeds a certain value. Therefore, the conveying device 1 may be equipped with a measuring device for measuring the load applied to the support portion 3. In addition, since the rotating roller 30b is provided symmetrically with respect to the central axis of the axle 21 in the axial view of the axle 21, even if the central axis C2 of the support portion 3 and the central axis of the axle 21 do not overlap in a plan view, when a part of the rotating roller 30b comes into contact with the axle 21, the traveling body 4 moves so that the central axis C2 of the support portion 3 and the central axis of the axle 21 overlap in a plan view. Therefore, when the conveying device 1 is installed below the wheel set 2, it is not necessary to precisely align the central axis C2 of the support part 3 with the central axis of the axle 21. Furthermore, even if the diameter of the axle 21 of the wheel set 2 is greater than the separation distance between the rotating rollers 30b, 30b in the X direction, the bearing mechanism 30 can support the axle 21, so the conveying device 1 can convey multiple types of wheel sets 2.

[0035] Here, the wheels 20, 20 of the axle 2 are on the rail R. In this case, when the operator applies power to the conveying device 1 in the X direction via the handle 42, a frictional force acts between the axle 21 and the rotating roller 30b. When this frictional force becomes greater than the maximum static frictional force acting between the axle 21 and the rotating roller 30b, the rotating roller 30b, which receives the frictional force from the axle 21, rotates in the reverse direction with respect to the traveling direction of the conveying device 1. Conversely, the axle 21 rotates in the forward direction with respect to the traveling direction of the conveying device 1 due to the frictional force, so the wheels 20, 20 rotate due to the rotation of the axle 21. Then, due to the friction acting between the wheel 20 and the rail R, the axle 2 obtains a propulsive force and moves on the rail R along the X direction. Therefore, since the axle 2 can be moved by applying a power greater than the maximum static frictional force acting between the axle 21 and the rotating roller 30b, it is not necessary to apply the power required for lifting and transporting the axle 21. Furthermore, since the wheel set 2 moves in the X direction due to inertia once the wheels 20 start to rotate, the operator does not need to continue to apply the power initially applied to the conveyance device 1 to move the conveyance device 1 and the wheel set 2. After the wheels 20 of the wheel set 2 start to rotate, the operator only needs to apply power to the conveyance device 1 as appropriate to adjust the rotation speed of the wheels 20, making it possible to reduce the labor required to convey the wheel set 2. Also, since the support part 3 bears part of the load of the wheel set 2, even if the conveyance device 1 is lightweight, the power applied to the conveyance device 1 is not transmitted to the wheel set 2, preventing the wheels 40 from spinning freely, and making it possible to make the conveyance device 1 smaller in size.

[0036] Even when the axle 2 is moved in the opposite direction to the X direction, the axle 2 can be transported in the same manner as the above-mentioned mechanism by pulling the transport device 1. That is, when the operator applies power to the handle 42, frictional force is generated between the axle 21 and the rotating roller 30b, causing the axle 21 and the rotating roller 30b to rotate, and the axle 21 moves along the traveling direction.

[0037] In addition, since the support part 3 has a rotation mechanism 31, even if the traveling direction of the running body 4 inserted under the axle 2 is not parallel to the traveling direction of the axle 2, the plate part 43 rotates relative to the axle 2, so that the axle 2 and the conveying device 1 can smoothly transport the axle 2 without competing with each other. Therefore, when inserting the plate part 43 under the axle 21, it is not necessary to strictly match the traveling direction of the running body 4 and the traveling direction of the axle 2, so that the operation is not complicated. Furthermore, when moving the axle 2 from the rail R to another rail, it is also possible to rotate the axle 2 around the wheel 40a by placing the axle 2 on a turntable provided between the rail R and the other rail and placing the wheel 40a outside the turntable. As a result, the turntable can be rotated by the power given to the wheel 40a, so that a power mechanism for the turntable is not required.

[0038] Second Embodiment Next, a conveying device 1 for conveying a wheel set 2 according to a second embodiment will be described with reference to Fig. 5. The conveying device 1 has a drive mechanism 45 that applies a driving force to assist traveling, and auxiliary wheels 47 that prevent the wheels 40 from coming off. The drive mechanism 45 is, for example, an assist unit (PAU-02D, Yamaichi Seiko Co., Ltd.) including an electric motor, and can be detachably attached to the traveling body 4 by a connecting member 46. In this embodiment, the connecting member 46 is attached so as to cover the lifting mechanism 41.

[0039] Auxiliary wheels 47 are disposed on the plate portion 43 on the outer side in the X direction than the wheels 40b. The diameter of the auxiliary wheels 47 may be the same as or larger than the wheels 40a and 40b. The auxiliary wheels 47 may be attached to the plate portion 43 via a mounting plate 47a, or may be provided integrally with the plate portion 43. The auxiliary wheels 47 are provided at positions symmetrical with respect to the central axis C1 of the plate portion 43, and the distance between the auxiliary wheels 47, 47 in the Y direction is shorter than the distance between the wheels 20, 20 of the wheel set 2. The other configurations are the same as those of the first embodiment, and therefore description thereof will be omitted.

[0040] The drive mechanism 45 may be capable of towing a heavy load of, for example, 1 ton. This makes it possible to use the conveying device 1 to convey the axles 2 even in cases where a larger power is required than when conveying the axles 2 alone, such as when conveying multiple axles 2 connected together or when conveying axles 2 loaded on a dolly. In addition, since even a person with weak strength (elderly people, women, etc.) can convey the axles 2 alone, any operator of the conveying device 1 is possible. When using the conveying device 1, the operator operates the handle portion provided on the drive mechanism 45 instead of the handle 42.

[0041] In addition, by having the auxiliary wheels 47, even if there are steps or clearances on the road on which the conveying device 1 runs, the auxiliary wheels 47 support the running body 4, so that the wheels 40 do not stumble over the steps and the wheel set 2 can be transported smoothly.

[0042] Other embodiments (1) In the above embodiment, the distance between the rotating rollers 30b, 30b when viewed in the axial direction of the axle 2 may be adjustable. This allows the axle 21 to be supported at an appropriate position regardless of whether the diameter of the axle 21 is small or large, so that the axle 2 can be transported stably.

[0043] (2) In the above embodiment, the traveling body 4 may have a self-propelled drive mechanism. This eliminates the need for the operator of the transport device 1 to apply power to the transport device 1, making it possible to further reduce the labor required to transport the axle 2. In addition, by making the height of the transport device 1 equal to or lower than the height of the axle 21, the transport device 1 can be inserted under the axle 21 even when a dolly is placed on the axle 2, making it possible to transport the axle 2 by the transport device 1 even when there is not enough space around the axle 2.

[0044] (3) In the above embodiment, the number of rotating rollers 30b may be more than eight or less than eight. In addition, the bearing mechanism 30 may be a sliding bearing.

[0045] (4) In the above embodiment, an example has been shown in which the wheel set 2 is transported. However, the wheel set 2 may carry a heavy object such as an undercarriage device other than a bogie. [Industrial Applicability]

[0046] The present invention can be used in a conveying device for conveying wheelsets or heavy objects including wheelsets. [Explanation of symbols]

[0047] 1: Transport device 2: Wheel axle 3: Support part 4: Running body 21: Axle 30: Bearing mechanism 30b: Rotating roller 31: Rotation mechanism 40 :Wheel 40a: Wheels 40b :Wheel 45: Drive mechanism 47: Training wheels R: Rail

Claims

1. A conveying device that conveys a wheel set or a heavy object including the wheel set along a rail, A support part for supporting the axle of the wheel set and a running body having wheels for moving the support part, The support portion has a bearing mechanism that rotatably supports the axle and bears a portion of the load of the wheel set.

2. The conveying device according to claim 1 , wherein the traveling body has a lifting mechanism for lifting the support part relative to the axle.

3. 3. The conveying device according to claim 2, wherein the bearing mechanism includes a pair of rotating rollers that are provided symmetrically about the axle when viewed in the axial direction of the axle.

4. The transport device according to any one of claims 1 to 3, wherein the support portion has a rotation mechanism that is rotatable relative to the traveling body.

5. The transport device according to claim 4 , wherein the traveling body has a drive mechanism that applies a driving force to assist the traveling.

6. The conveying device according to claim 5 , wherein the traveling body has auxiliary wheels for preventing the traveling body from coming off the tracks.

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