JP6670093B2 - Railcar bogie - Google Patents

Description

  The present invention relates to a bogie for a railway vehicle provided with a third rail type current collector.

  There are a plurality of methods for a railway vehicle to collect power from ground facilities. In the third rail system, a third rail (power supply rail) is laid in parallel with a pair of traveling rails, and a current collector is attached to a supporting device connected to a pair of axle boxes separated in the vehicle longitudinal direction of the bogie. . Then, current collection is performed by the current collection shoes of the current collection device provided on the cart contacting and sliding on the third rail (see Patent Document 1).

US Publication No. 2015/0090553

  The support device is provided with a cylindrical elastic bush so as to allow a relative displacement of the pair of axle boxes, and the current collector is such that the current collector shoes cantileverly project outward in the vehicle width direction. Attached to the support device. Therefore, the current collecting device can be dynamically rotated and displaced so that the current collecting shoe swings up and down due to vibrations or the like during traveling of the vehicle. In particular, when a large vibration is generated in the bogie such as when the vehicle passes a branch point of the traveling rail, the current collector may be significantly displaced and exceed the vehicle limit.

  To prevent the current collector from exceeding the vehicle limit even when a large vibration occurs, it is conceivable to increase the rigidity of the elastic bush. For example, if the elastic bush is arranged so that the axis is oriented in the vehicle width direction, and flanges are provided at both ends in the axial direction of the elastic bush, the direction in which the outer cylinder is inclined with respect to the inner cylinder when viewed from the vehicle longitudinal direction. And / or the rigidity of the elastic bush when displacing in the vehicle width direction is increased. However, since the flanges are added to both ends of the elastic bush in the axial direction, the elastic bush becomes longer in the vehicle width direction, and when the vehicle limit is severe, the current collector exceeds the vehicle limit.

  Therefore, an object of the present invention is to improve the rigidity of the elastic bush, make the elastic bush compact in the vehicle width direction, and prevent the current collector of the third rail system from exceeding the vehicle limit.

  A bogie for a railway vehicle according to one aspect of the present invention includes a pair of axle boxes separated in the vehicle longitudinal direction that respectively house bearings that support a pair of axles, a support device connected to the pair of axle boxes, A third rail type current collector attached to a support device, wherein the support device has at least one elastic bush whose axis is directed in the vehicle width direction, and the elastic bush has an inner cylinder and An outer cylinder, an elastic body interposed between the inner cylinder and the outer cylinder, a concave portion which is annular and radially inwardly depressed on the outer peripheral surface of the inner cylinder around the axis. Is formed on the inner peripheral surface of the outer cylinder, a convex portion that is annular and protrudes radially inward around the axis is formed, and the convex portion fits into the concave portion via the elastic body, and The concave portion and the convex portion are formed in an arc shape when viewed from a direction perpendicular to the axis.

  According to the above configuration, in the elastic bush whose axis is oriented in the vehicle width direction, the concave portion is formed on the outer peripheral surface of the inner cylinder and the convex portion is formed on the inner peripheral surface of the outer cylinder, and the concave portion and the convex portion are aligned with the axis. When the outer cylinder is displaced in the direction inclined with respect to the inner cylinder and / or displaced in the vehicle width direction when viewed from the vehicle longitudinal direction, the convex portion is formed. Is received by many areas of the recess. Therefore, the rigidity of the elastic bush at the time of the displacement is improved, and it is possible to prevent the current collector of the third rail system from exceeding the vehicle limit when the bogie vibrates. Further, since the concave portion and the convex portion are formed in an arc shape when viewed from a direction perpendicular to the axis, when the outer cylinder is displaced in a direction inclined with respect to the inner cylinder when viewed from the vehicle longitudinal direction and / or in a vehicle width direction. The elastic bush can be made compact in the vehicle width direction by shortening the concave portion and the convex portion in the axial direction while increasing the area for receiving the load from the convex portion when the concave portion is displaced. Therefore, even when the vehicle limit is severe, the current collector can be prevented from exceeding the vehicle limit.

  ADVANTAGE OF THE INVENTION According to this invention, the rigidity of an elastic bush can be improved and an elastic bush can be made compact in the vehicle width direction, and it can prevent that the current collector of the 3rd rail system exceeds the vehicle limit.

It is a side view of the bogie for railway vehicles which concerns on embodiment. FIG. 2 is a partially sectional front view of the bogie support device shown in FIG. 1 and its vicinity when viewed from the vehicle longitudinal direction. It is the top view which looked at the support apparatus of the trolley | bogie shown in FIG. 1, and its vicinity from the upper direction. It is sectional drawing which looked at the stopper of the bogie shown in FIG. 1, and its vicinity from the vehicle longitudinal direction. It is sectional drawing of the main elastic bush shown in FIG. FIG. 6 is a diagram illustrating the operation of the main elastic bush shown in FIG. 5.

  Hereinafter, embodiments will be described with reference to the drawings. In the following description, the direction in which the railway vehicle travels and the direction in which the vehicle body extends is defined as the vehicle longitudinal direction, and the lateral direction perpendicular to the vehicle longitudinal direction is defined as the vehicle width direction. The longitudinal direction of the vehicle is also referred to as the front-rear direction, and the vehicle width direction is also referred to as the left-right direction.

  As shown in FIG. 1, the bogie 2 of the railway vehicle 1 of the present embodiment is a steering bogie. The carriage 2 supports the vehicle body 3 from below. The carriage 2 includes a bolster 5 extending in the vehicle width direction for supporting the vehicle body 3 via the air spring 4. The bolster 5 is connected to a bracket 3 a of the vehicle body 3 by a bolster anchor 6. The bolster 5 is connected to the bogie frame 7 via a turning guide mechanism (for example, a center pin and a center plate) arranged at the center of the bogie. That is, the bogie frame 7 supports the bolster 5 from below so as to be rotatable with respect to the bolster 5 in the yawing direction.

  The bogie frame 7 has a cross beam 7 a extending in the vehicle width direction below the bolster 5. A pair of axles 8 (see FIG. 2) extending along the vehicle width direction are arranged on both sides of the cross beam 7a in the vehicle longitudinal direction. Wheels 9 are provided on both sides of the axle 8 in the vehicle width direction. At both ends of the axle 8 in the vehicle width direction, bearings 10 (see FIG. 2) that rotatably support the axle 8 outside the wheels 9 in the vehicle width direction are provided. The bearing 10 on one side in the vehicle longitudinal direction is accommodated in an axle box 11, and the bearing 10 on the other side in the vehicle longitudinal direction is accommodated in an axle box 12.

  Ends of the cross beams 7a in the vehicle width direction are connected to the axle boxes 11, 12 by connecting mechanisms 13, 14, respectively. The coupling mechanisms 13 and 14 include axial beams 15 and 16 extending from the axial boxes 11 and 12 in the vehicle longitudinal direction toward the cross beam 7a. That is, the carriage 2 is a so-called beam-type carriage. The bogie frame 7 further includes a pair of receiving seats 17 and 18 (see FIG. 4) projecting from the cross beams 7a toward the shaft beams 15 and 16 and spaced from each other in the vehicle width direction. Is elastically coupled to receiving seats 17 and 18 via rubber bushes (not shown).

  A leaf spring 20 extending in the vehicle longitudinal direction is bridged between the pair of axle boxes 11 and 12 separated in the vehicle longitudinal direction. The longitudinal center portion 20a of the leaf spring 20 supports the end of the cross beam 7a in the vehicle width direction from below, and the longitudinal one end 20b of the leaf spring 20 is supported by the axle box 11, and the longitudinal direction of the leaf spring 20 The other end 20c in the direction is supported by the axle box 12. That is, the leaf spring 20 has both the function of the primary suspension and the function of the conventional side beam.

  A pressing member 21 having a downwardly projecting arc-shaped lower surface is provided at a lower portion of an end portion of the cross beam 7a in the vehicle width direction, and the pressing member 21 is placed on the central portion 20a of the leaf spring 20 from above and can be separated therefrom. Contact. That is, in a state where the leaf spring 20 is not fixed to the pressing member 21 in the vertical direction, the pressing member 21 freely contacts the upper surface of the leaf spring 20 by the downward load due to the gravity from the cross beam 7a and presses from above. Support members 22 and 23 are attached to the upper ends of the axle boxes 11 and 12, and the ends 20 b and 20 c of the leaf spring 20 are supported by the axle boxes 11 and 12 from below via the support members 22 and 23. You. The upper surfaces of the support members 22 and 23 are inclined toward the center in the vehicle longitudinal direction. The ends 20b and 20c of the leaf spring 20 are also mounted on the support members 22 and 23 from above without being fixed to the support members 22 and 23 in the vertical direction.

  The support members 22 and 23 include base members 24 and 25 (for example, vibration-proof rubber) installed on the axle boxes 11 and 12, spacers 26 and 27 installed on the base members 24 and 25, and spacers. And receiving members 28 and 29 installed on 26 and 27. The spacers 26 and 27 have a wedge shape in a side view, and have upper surfaces inclined downward toward the center of the bogie. Therefore, the upper surfaces of the receiving members 28 and 29 and the ends 20b and 20c of the leaf spring 20 placed on the upper surfaces incline downward toward the center of the bogie. The leaf spring 20 passes through a space between the pair of receiving seats 17 and 18 at a portion between the central portion 20a and the end portions 20b and 20c. The center portion 20a of the leaf spring 20 is disposed lower than the end portions 20b and 20c, and the leaf spring 20 has a downwardly convex bow shape in a side view.

  The bogie 2 has a steering link mechanism 30 for tilting the pair of axles 8 in the yawing direction with respect to the bogie frame 7 for steering. The steering link mechanism 30 includes a steering lever 31 disposed outside the bogie frame 7 in the vehicle width direction. The steering lever 31 has a fulcrum 32, a power point 33, a first point of action 34, and a second point of action 35. The first operation point 34 is arranged on one side of the fulcrum 32, and the second operation point 35 is arranged on the other side of the fulcrum 32. The steering lever 31 is supported by the bogie frame 7 at a fulcrum 32 so as to be rotatable around an axis extending in the vehicle width direction. The steering lever 31 is connected to the bolster 5 via a connection link 36 at a power point 33. The steering lever 31 is connected to the axle box 11 on one side in the vehicle longitudinal direction via the first steering link 37 and the shaft beam 15 at a first operation point 34. The steering lever 31 is connected to the axle box 12 on the other side in the vehicle longitudinal direction at the second operation point 35 via the second steering link 38 and the shaft beam 16.

  When the bogie 2 passes through the curve, the steering link mechanism 30 operates in conjunction with the relative rotation of the bogie frame 7 about the vertical axis with respect to the bolster 5. That is, when the steering lever 31 rotates about a fulcrum 32 in a vertical plane, the first steering link 37 and the second steering link 38 move the axle box 11 and the axle box 12 toward or away from each other. The relative displacement in the longitudinal direction causes the pair of axles 8 to be steered.

  A support device 40 that supports a third rail type current collector 39 is connected to the axle boxes 11 and 12. The support device 40 is connected to the first bracket mechanism 41 attached to the axle box 11, the second bracket mechanism 42 attached to the axle box 12, the first bracket mechanism 41 and the second bracket mechanism 42, and extends in the vehicle longitudinal direction. And a collector beam 43 extending in the direction. The current collecting device 39 is attached to the longitudinal center of the current collecting beam 43. The current collecting beam 43 is made of an insulating fiber-reinforced resin (for example, GFRP) containing a non-conductive fiber (for example, glass fiber). Therefore, the current collecting beam 43 can be made lightweight and high-strength, and the current collecting beam 43 can be provided with electrical insulation, and the current collecting beam 43 can be prevented from burning in a fire or the like. As will be described later, stoppers 70 and 71 for controlling the displacement of the current collecting beam 43 are connected to the receiving seats 17 and 18 of the bogie frame 7.

  As shown in FIGS. 2 and 3, the first bracket mechanism 41 includes a box-side bracket 45, an intermediate bracket 46, a beam-side bracket 47, a main elastic bush 48, and a sub-elastic bush 49. The box side bracket 45 is fixed to the shaft box 11. The beam side bracket 47 is fixed to the current collecting beam 43. The main elastic bush 48 is interposed between the box side bracket 45 and the intermediate bracket 46. The sub elastic bush 49 is interposed between the intermediate bracket 46 and the beam side bracket 47.

  The second bracket mechanism 42 includes a box-side bracket 51, a beam-side bracket 52, and a main elastic bush 53. The box side bracket 51 is fixed to the shaft box 12. The beam side bracket 52 is fixed to the current collecting beam 43. The main elastic bush 53 is provided between the box side bracket 51 and the beam side bracket 52. Even if the pair of axle boxes 11, 12 is relatively displaced in the longitudinal direction of the vehicle by the steering link mechanism 30, the main elastic bushes 48, 53 and the auxiliary elastic bush 49 follow the relative displacement of the pair of axle boxes 11, 12. Thus, smooth steering can be realized without overloading the current collecting beam 43.

  Each of the main elastic bush 48 and the sub elastic bush 49 includes an inner cylinder 61, 64, an outer cylinder 62, 65, and an elastic body 63 interposed between the inner cylinder 61, 64 and the outer cylinder 62, 65. 66 (for example, rubber). Each of the main elastic bush 48 and the sub elastic bush 49 is arranged with its axis directed in the vehicle width direction. The box side bracket 45 is fixed to the inner cylinder 61 of the main elastic bush 48. The upper part of the intermediate bracket 46 is fixed to the outer cylinder 62 of the main elastic bush 48. The lower part of the intermediate bracket 46 is fixed to the inner cylinder 64 of the sub elastic bush 49. The beam side bracket 47 is fixed to the outer cylinder 65 of the sub elastic bush 49.

  The main elastic bush 48 is disposed outside the axle box 11 in the vehicle width direction so as to overlap the axle box 11 when viewed from the vehicle width direction. The sub elastic bush 49 and the current collecting beam 43 are disposed below the axle box 11 and inside the main elastic bush 48 in the vehicle width direction. The intermediate bracket 46 has a shape inclined downward and inward in the vehicle width direction. Specifically, the auxiliary elastic bush 49 is disposed directly below the axle box 11, and the position of the current collecting beam 43 in the vehicle width direction overlaps with the position of the axle boxes 11 and 12 in the vehicle width direction. As described above, the auxiliary elastic bush 49 is offset from the main elastic bush 48 in the vehicle width direction, so that the support device 40 can be easily arranged so as not to exceed the vehicle limit X. However, the center of gravity G of the entire support device 40 and the current collector 39 is located outside the center of the current collector beam 43 in the vehicle width direction. The vertical dimension of the sub elastic bush 49 is smaller than the vertical dimension of the main elastic bush 48. The dimension of the auxiliary elastic bush 49 in the vehicle width direction is smaller than the dimension of the auxiliary elastic bush 49 in the vehicle width direction. Note that the configuration of the main elastic bush 53 is the same as the configuration of the main elastic bush 48, and a detailed description thereof will be omitted.

  The current collecting device 39 includes a mounting base 39b fixed to the outer side surface of the current collecting beam 43 in the vehicle width direction, and a current collecting shoe 39a protruding from the mounting portion base 39b outward in the vehicle width direction in a cantilever manner. Have. An electric cable (not shown) connected to a vehicle-mounted component (for example, a switch) mounted on the vehicle body 3 is electrically connected to the current collecting shoe 39a. The current collecting shoe 39a extends to the outside in the vehicle width direction from the main elastic bush 48 and is slidably in contact with the upper surface of the third rail 80.

  As shown in FIGS. 1, 3, and 4, a pair of stoppers 70, 71 are fixed to the receiving seats 17, 18 of the bogie frame 7 with bolts B. The stoppers 70 and 71 face the current collecting beam 43 from both sides in the vehicle width direction with a gap. The size of the gap in the vehicle width direction is smaller than the size of the current collecting beam 43 in the vehicle width direction. The stoppers 70, 71 are made of a metal stopper plate 72, 73 fixed to the receiving seat 17, and a plate-shaped elastic member 74 fixed to the side surface of the stopper plate 72, 73 facing the current collecting beam 43 by bonding or the like. , 75 (for example, a rubber plate).

  When the current collector beam 43 to which the current collector 39 is attached is pivotally displaced to a predetermined angle around the longitudinal direction of the vehicle or when the current collector beam 43 is displaced in the vehicle width direction during the vibration of the bogie 2, The contact with the elastic members 74 and 75 interferes with the stoppers 70 and 71. As described above, since the stoppers 70 and 71 regulate the rotational displacement of the current collector beam 43, the rigidity of the support device 40 is not excessively increased, and the current collector 39 does not exceed the vehicle limit X when the bogie 2 vibrates. Can be prevented. In addition, since the stoppers 70 and 71 are arranged to face the current collecting beam 43 closer to the current collecting device 39 than the first bracket mechanism 41, the stopper 70 and 71 allow the supporting device 40 to be displaced and Can be reliably restricted. In addition, since the stoppers 70 and 71 are provided with the elastic members 74 and 75, the impact when the stoppers 70 and 71 come into contact with the current collector beams 43 is reduced, and the fluttering of the current collector 39 can be suppressed.

  The stoppers 70 and 71 are not disposed on the second bracket mechanism 42 side of the current collector 39 but are disposed on the first bracket mechanism 41 side. That is, in a configuration in which the first bracket mechanism 41 has two elastic bushes 48 and 49 and the second bracket mechanism 42 has one elastic bush 53, the stoppers 70 and 71 have two elastic bushes 48 and 49. It is arranged on the first bracket mechanism 41 side. Therefore, the stoppers 70 and 71 are arranged corresponding to portions of the current collecting beam 43 where the displacement is likely to be large, and the compact stoppers 70 and 71 effectively reduce the rotational displacement of the current collecting beam 43. Can be regulated.

  The main elastic bush 48 and the main elastic bush 53 have the same structure and the same size as each other, and the main elastic bushes 48 and 53 and the auxiliary elastic bush 49 have the same structure, although they are similar and different in size. Therefore, the structure of the main elastic bush 48 will be described below as a representative.

  As shown in FIG. 5, the main elastic bush 48 includes an inner cylinder 61, an outer cylinder 62, and an elastic body 63 provided between the inner cylinder 61 and the outer cylinder 62. A shaft portion of the box-side bracket 45 extending in the vehicle width direction is press-fitted into the inner cylinder 61 (see FIG. 2). On the outer peripheral surface of the inner cylinder 61, a concave portion 61a that is annular around the axis line AL and that is depressed inward in the radial direction is formed. The dimension L2 of the outer cylinder 62 in the direction of the axis AL is smaller than the dimension L1 of the inner cylinder 61 in the direction of the axis AL. On the inner peripheral surface of the outer cylinder 62, a convex portion 62a that is annular around the axis AL and protrudes radially inward is formed. In the present embodiment, the entire outer peripheral surface of the outer cylinder 62 is the projection 62a. The convex portion 62a is fitted into the concave portion 61a via the elastic body 63, and the concave portion 61a and the convex portion 62a are formed in an arc shape when viewed from a direction orthogonal to the axis AL. In the present embodiment, the arc shape of the concave portion 61a and the convex portion 62a is a shape composed of a part of a perfect circle, but may be a shape composed of a part of an ellipse.

  The elastic body 63 has a cylindrical shape, and covers the outer peripheral surface of the inner cylinder 61 so as to cover the recess 61 a of the inner cylinder 61. The elastic body 63 is made of self-lubricating rubber. Specifically, the elastic body 63 includes a concave portion 63a that is in close contact with the concave portion 61a of the inner cylinder 61, and an elastic body 63 that protrudes outward from both ends of the concave portion 63a in the axial line AL direction in the axial line AL direction on the outer peripheral surface of the inner cylinder 61. And a flange portion 63b that is in close contact with the end of the flange 63b. The thickness T of the concave portion 63a of the elastic body 63 is thin, and the rigidity of the main elastic bush 48 is relatively high. In the present embodiment, the thickness T of the portion of the elastic body 63 sandwiched between the inner cylinder 61 and the outer cylinder 62, that is, the concave portion 63a is 2 mm or more and 5 mm or less. The thickness T of the concave portion 63a of the elastic body 63 is 15% or more and 35% or less of the depth D of the concave portion 61a of the inner cylinder 61. The thickness of the flange 63b is smaller than the thickness T of the recess 63a.

  As shown in FIG. 6, in the configuration in which the axis AL of the main elastic bush 48 coincides with the vehicle width direction, when the bogie 2 vibrates, the direction in which the outer cylinder 62 is inclined with respect to the inner cylinder 61 when viewed from the vehicle longitudinal direction. Or in the vehicle width direction. In the main elastic bush 48, a concave portion 61a is formed on the outer peripheral surface of the inner cylinder 61 and a convex portion 62a is formed on the inner peripheral surface of the outer cylinder 62, and the concave portion 61a and the convex portion 62a are arranged in a direction perpendicular to the axis AL. Since it is formed in an arc shape when viewed, the load from the convex portion 62a is received by many regions of the concave portion 61a at the time of the above displacement. Therefore, the rigidity of the main elastic bush 48 at the time of the displacement is improved, and it is possible to prevent the current collecting device 39 of the third rail system from exceeding the vehicle limit X when the bogie 2 vibrates. Further, since the concave portion 61a and the convex portion 62a are formed in an arc shape when viewed from a direction orthogonal to the axis AL, the concave portion 61a has a large area for receiving the load from the convex portion 62a at the time of the above displacement. In addition, the main elastic bush 48 can be made compact in the vehicle width direction by shortening the protrusion 62a in the direction of the axis AL. Therefore, even when the vehicle limit is severe, the current collector 39 can be prevented from exceeding the vehicle limit X.

  Further, since the thickness T of the elastic body 63 is small and the concave portion 61a can easily receive the load from the convex portion 62a, the rigidity of the main elastic bush 48 at the time of the above displacement is improved, and the current collector 39 is mounted on the vehicle when the bogie 2 vibrates. Exceeding the limit X can be suitably prevented. Further, since the elastic body 63 of the main elastic bush 48 is made of self-lubricating rubber, the displacement tolerance of the main elastic bush 48 at the time of steering is increased and the life of the main elastic bush 48 is increased as compared with the case where normal rubber is used. Can be long.

  The effect of the main elastic bush 48 described above is the same for the main elastic bush 53 and the sub elastic bush 49. The main elastic bushes 48 and 53 and the auxiliary elastic bush 49 have their axes AL directed in the vehicle width direction. The cylinder 61 and the outer cylinder 62 can relatively rotate around the axis AL. Therefore, even if the thickness of the elastic body 63 is thin, the steering can be smoothly performed by the relative rotation.

REFERENCE SIGNS LIST 1 railway vehicle 2 bogie 3 body 5 bolster 7 bogie frame 8 axle 10 bearing 11, 12 axle box 30 steering link mechanism 39 current collector 40 support device 41 first bracket mechanism 42 second bracket mechanism 43 current collector beam 45, 51 box Side bracket 46 Intermediate bracket 47, 52 Beam side bracket 48, 53 Main elastic bush 49 Secondary elastic bush 61 Inner cylinder 61a Recess 62 Outer cylinder 62a Convex 63 Elastic body 70, 71 Stopper 72, 73 Stopper plate 74, 75 Elastic member 80 Third rail X Vehicle limit

Claims (7)

A pair of axle boxes spaced apart in the vehicle longitudinal direction that respectively house bearings that support a pair of axles,
A support device connected to the pair of axle boxes,
And a third rail type current collector attached to the support device,
The support device has at least one elastic bush whose axis is directed in the vehicle width direction,
The elastic bush includes an inner cylinder, an outer cylinder, and an elastic body interposed between the inner cylinder and the outer cylinder,
On the outer peripheral surface of the inner cylinder, a concave portion that is annular around the axis and concave inward in the radial direction is formed,
On the inner peripheral surface of the outer cylinder, a convex portion that is annular around the axis and protrudes radially inward is formed,
The bogie for a railway vehicle, wherein the convex portion fits into the concave portion via the elastic body, and the concave portion and the convex portion are formed in an arc shape when viewed from a direction orthogonal to the axis. The support device includes a first bracket mechanism attached to one of the pair of axle boxes, a second bracket mechanism attached to the other of the pair of axle boxes, the first bracket mechanism, and the second A current collecting beam connected to the bracket mechanism and extending in the vehicle longitudinal direction,
The current collector is attached to the current collector beam,
Each of the first bracket mechanism and the second bracket mechanism has a plurality of brackets,
The bogie for a railway vehicle according to claim 1, wherein the at least one elastic bush is interposed between the plurality of brackets. In conjunction with the vertical axis of relative rotation of that base vehicle frame against the vehicle body or bolster further comprising a steering link mechanism for steering the axle,
The plurality of brackets of the first bracket mechanism includes a box-side bracket attached to the axle box, an intermediate bracket, and a beam-side bracket attached to the current collecting beam,
The at least one elastic bush of the first bracket mechanism is interposed between the main elastic bush interposed between the box side bracket and the intermediate bracket, and interposed between the intermediate bracket and the beam side bracket. The bogie for a railway vehicle according to claim 2, further comprising a sub elastic bush.   The bogie for a railway vehicle according to claim 3, wherein the auxiliary elastic bush is disposed below the axle box and inside the main elastic bush in the vehicle width direction.   The bogie for a railway vehicle according to any one of claims 1 to 4, wherein the elastic body is made of self-lubricating rubber.   The bogie for a railway vehicle according to any one of claims 1 to 5, wherein a thickness of a portion of the elastic body sandwiched between the inner cylinder and the outer cylinder is 5 mm or less.   The railcar according to any one of claims 1 to 6, wherein a thickness of a portion of the elastic body sandwiched between the inner cylinder and the outer cylinder is 35% or less of a depth of the concave portion. Trolley.

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