JP6275971B2 - Elastic bush for railway vehicles - Google Patents

Description

  The present invention relates to an elastic bush for a railway vehicle suitable for an axial beam device of a railway carriage. More specifically, the present invention relates to a central axis having an axis that intersects the traveling direction of the vehicle and a radially outer side of the central axis. The present invention relates to an elastic bush for a railway vehicle having an outer member provided and an elastic member interposed between a central axis and the outer member.

  For example, the shaft beam device has a substantially cylindrical shape made of a central axis perpendicular to the vehicle traveling direction in a cylindrical housing portion provided at one end of the shaft beam, and rubber or the like disposed and fixed on the outer periphery of the central axis. An elastic bush for a railway vehicle comprising an elastic body and an outer cylinder as an outer member fixed so as to cover the outer peripheral surface of the substantially cylindrical elastic body is fitted and fixed, and the center of the elastic bush for the railway vehicle The shaft is non-rotatably fixed to the bogie frame.

Due to the above-described structure, the elastic action of the substantially cylindrical elastic body of the elastic bush for railway vehicles absorbs vibrations and shocks at the connecting part between the shaft beam and the carriage frame while allowing rotational movement about the central axis of the shaft beam. The anti-vibration function can be demonstrated. As such a technique, for example, those disclosed in Patent Document 1 and Patent Document 2 are known.
In the thing of patent document 1, as FIG. 6 shows, the inner cylinder (not shown) externally fitted to the torsion bar (8) and the outer cylinder (noted) attached to the side beam (2). None) and a ring-shaped elastic layer (rubber bush: 9) interposed between the inner and outer cylinders constitute an elastic bush.

Since various forces such as centrifugal force or rolling due to vehicle acceleration / deceleration and curved traveling are applied to the elastic bush for railway vehicles, a large load is applied in both the axial direction and the radial direction. A design that assumes this is required.
As an example, in the case of an elastic bush for a railway vehicle that focuses on the action of a large load during deceleration by braking, in order to obtain good durability while receiving the large load, Pre-compression means may be employed in which the cylindrical elastic body is equipped in a state compressed in the radial direction in advance.

  That is, when the pre-compression means described in Patent Document 2 is adopted, the radial thickness of the substantially cylindrical elastic body (10) is set to a somewhat large value, and the half base case (4B) is secured by fastening the bolt (9). ) And the half-cut end case (4A), it is possible to assemble the substantially cylindrical elastic body (10) in a compressed state.

JP-A-6-247300 JP 2000-225940 A

When a railway vehicle elastic bush is used in the above-mentioned axial beam device, the ratio between the axial rigidity (or spring constant) and the radial rigidity (or spring constant) of the central axis, that is, the rigidity ratio is Depending on the type and specifications of the railway vehicle, a low rigidity ratio (high rigidity in the axial direction) of about 2 times (about 1 to 3 times) may be required.
The elastic bush having a simple cylindrical elastic layer shown in Patent Document 1 cannot increase the rigidity in the axial direction (the rigidity in the left-right direction with respect to the vehicle traveling direction) because of its structure. The stiffness ratio is in the range of 20 times.

On the other hand, an elastic bushing having a structure shown in Patent Document 2, that is, an elastic bushing that has a rubber layer that goes around to the left and right and that can be pre-compressed in the radial direction, has a rigidity ratio somewhat higher than that of Patent Document 1. There are benefits that can be improved. However, it has not been possible to achieve a rigidity ratio as low as twice.
For this reason, in the conventional elastic bush, it is often difficult to set the required low rigidity ratio to be sufficiently satisfactory, such as a slight shortage in the rigidity in the axial direction. As described above, in order to realize the elastic bush for railway vehicles having the low rigidity ratio characteristics described above, there is still room for improvement.

  The object of the present invention is to further reduce the rigidity ratio required by enabling further setting of the rigidity ratio, which is the ratio of the rigidity in the axial direction and the rigidity in the radial direction of the central axis. The present invention is to provide an improved elastic bush for a railway vehicle so that it can be adapted to the above.

The invention according to claim 1 includes a central shaft 7 having an axis P in a direction intersecting the vehicle traveling direction, an outer member 11 provided around the outer diameter of the central shaft 7, and the central shaft 7. In an elastic bush for a railway vehicle having an elastic member 10 interposed between the outer member 11 and the outer member 11,
The portion of the outer member 11 that fits on the elastic member 10 has a constant angle with respect to the axis P so that the diameter decreases toward the end of the outer member 11 in the width direction along the axis P. The portion of the central shaft 7 fitted into the elastic member 10 is inclined at a constant angle in the same direction as the inclined inner peripheral surface 12 with respect to the axis P. While having an inclined outer peripheral surface 13 that is inclined,
The elastic member 10 includes an inclined inner peripheral surface 12 and an inclined outer peripheral surface 13 formed by a diameter reducing process in which the inner diameter of the end portion 11t of the outer member 11 decreases toward the end in the axis P direction. A compressed portion 14 compressed in between,
The compressed portion 14 is compressed in both the direction of the axis P and the direction of diameter reduction with respect to the axis P by the diameter reducing process in a state where the elastic member 10 is fitted in the outer member 11 made of metal. It is equipped with a state of being,
The end portion 11t is formed in an inclined cylindrical portion 11B having a diameter that decreases toward the end in the axis P direction, and the elastic member 10 is fitted in the inclined inner peripheral surface 12 of the inclined cylindrical portion 11B. It has a taper outer peripheral surface 17b and a hook-shaped peripheral portion 17c that receives the end portion of the inclined cylindrical portion 11B .

The invention according to claim 2 is the elastic bush for a railway vehicle according to claim 1,
The inclined inner peripheral surface 12 is formed on each of both end portions of the outer member 11 in the axis P direction, and the elastic member 10 having the compressed portion 14 and the inclined outer peripheral surface 13 are each It is provided for each inclined inner peripheral surface 12.

The invention according to claim 3 is the elastic bush for a railway vehicle according to claim 2,
The outer member 11 has the inclined inner peripheral surface 12 and has inclined cylindrical portions 11B formed at both ends in the axis P direction, and an inner peripheral surface 11a parallel to the axis P. It is comprised by the cylindrical body provided with 11 A of straight cylinder parts formed between the inclination cylinder parts 11B .

The invention according to claim 4 is the elastic bush for a railway vehicle according to claim 3 ,
The elastic member 10 has a shape in which a portion located inside the diameter of the straight barrel portion 11A is lacked in a circumferential groove shape with respect to the axis P.

According to the first aspect of the present invention, since the compressed portion of the elastic material is compressed (precompressed) between the inclined inner peripheral surface and the inclined outer peripheral surface, the inclined inner peripheral surface and the inclined outer peripheral surface are inclined. Conditions such as the angle and the amount of compression can be set as appropriate. Thereby, the rigidity ratio of the radial rigidity (or spring constant) to the axial rigidity (or spring constant) of the central axis of the compressed portion can be set lower than in the past.
Further, by pre-compressing the elastic material, it is possible to reduce the strain in a state where the elastic material is deformed by an external input.
As a result, the rigidity ratio, which is the ratio of the rigidity of the central axis in the axial direction to the rigidity in the radial direction, is further reduced by adopting a structure in which the elastic material is pre-compressed between the tapered surfaces of the central axis and the outer member. It is possible to provide an improved elastic bush for a railway vehicle so that it can be set and can cope with a required low rigidity ratio.

If the configuration is such that the compressed parts are compressed not only in the direction of reducing the diameter of each compressed part but also in the direction approaching each other, the reaction force in the axial direction of each of the pair of compressed parts is obtained. It is possible to provide an elastic bush for a railway vehicle having a rational and balanced structure without having to separately provide a structure for receiving a load in the axial direction.

Since the left and right inclined cylindrical portions are formed by reducing the diameters of both end portions of the outer member in a state where the elastic material is fitted in the metal outer member, the inclined cylindrical portions are formed. By simply performing the process of manufacturing, there is no need for any other special processing or structure, and the desired shape can be formed. Therefore, there is an advantage that the productivity is excellent.

  According to the second aspect of the present invention, since the compressed parts to be compressed by the inclined inner peripheral surface and the inclined outer peripheral surface are provided as a pair at both end portions in the axial direction, the radial compression is performed. In addition to the compression in the axial direction, there is an advantage that the strength can be easily balanced and the performance can be stably exhibited.

According to the invention of claim 3 , since the outer member is a cylindrical body having a non-uniform diameter by providing inclined cylindrical portions at both ends thereof, when the inner member is fitted to a fitting object such as a housing. By making the inner peripheral surface a hole or a hole having a non-uniform diameter in the same manner as the outer member, the inner peripheral surface can be fitted and mounted while being prevented from coming off in the axial direction. This is clearly advantageous in that it can be prevented from shifting in the axial direction as compared with a case where a simple cylindrical shape is fitted and mounted on a simple cylindrical inner peripheral surface.
Therefore, it is possible to provide an elastic bush for a railway vehicle that can be equipped with a fitting object provided with a function of preventing the shaft from coming off.

And since the elastic material is the shape which lacked the right-and-left center part in the shape of a circumferential groove like Claim 4 , in the state where input was added from the outside at the time of actual use etc., each of the right and left compressed parts Can be displaced with little or no interference with each other, and an elastic bush for a railway vehicle that can stably exhibit functions such as a suspension function and a vibration isolation function can be provided.

Front view of a partially cutout showing an elastic bush for a railway vehicle (Embodiment 1) The main points of how to make the elastic bush are shown, (a) is an action diagram for laterally sliding the outer member and fitted to the elastic material, (b) is an action diagram for reducing the diameter of both ends of the outer member and caulking. Partially cutaway side view showing the railcar shaft beam device Fig. 3 is an enlarged vertical side view of the elastic bush portion. Fig. 3 is an enlarged cross-sectional plan view of the elastic bush portion. Side view of main part showing another example of use of elastic bush (another embodiment)

  Hereinafter, an embodiment of an elastic bush for a railway vehicle (hereinafter abbreviated as “elastic bush”) according to the present invention will be described with reference to the drawings as applied to an axial beam device of a railway vehicle.

Embodiment 1
FIG. 3 shows an outline of a shaft beam device of a railway vehicle. 1 is an axle, 2 is a shaft box part, 3 is a shaft beam, 4 is a housing part, 5 is a wheel attached to the axle 1, and 6 is an elastic bush. (Anti-vibration bush), 8 is a bogie frame.
The shaft beam 3 extends from the axle box portion 2 supporting the axle 1 in the vehicle traveling direction (arrow Y direction), and is provided with an elastic bush on a cylindrical housing portion 4 formed at one end of the shaft beam 3. 6 is fitted. A bifurcated support bracket 8 </ b> A that supports the central shaft 7 of the elastic bush 6 is formed to protrude downward from the carriage frame 8.

As shown in FIGS. 3 to 5, the outer member 11 of the elastic bush 6 is fitted and fixed in the fitting hole 4 </ b> H of the housing portion 4. The support bracket 8A is non-rotatably supported by a bolting means or the like.
With such a structure, the shaft beam 3 can swing and move around the axis P of the central shaft 7 and can absorb vibrations and shocks at the connecting portion between the shaft beam 3 and the carriage frame 8. ing.

  As shown in FIG. 4, the housing part 4 is a halved structure that is divided into two in the front-rear direction in the vehicle traveling direction Y. The front end side half body 4 </ b> A on the front side in the traveling direction is attached to the base end side half body 4 </ b> B integrally formed with the shaft beam 3 using bolts 9. As described above, when the housing portion 4 has a halved structure using the bolt 9, the outer member 11 is not only a cylindrical one but also has a constant outer diameter such as one having a spherical outer peripheral surface. It is possible to insert and fix the outer member having a non-circular shape into the housing 4 without difficulty.

As shown in FIGS. 1, 2, 3, and 4, the elastic bush 6 includes a central shaft 7 having an axis P in a direction intersecting the vehicle traveling direction Y, and a radially outer side of the central shaft 7. A substantially cylindrical outer member 11 provided and an elastic member 10 interposed between the central shaft 7 and the outer member 11 are provided.
The central shaft 7 has mounting holes 7h for passing bolts and the like, and has mounting sections 7B and 7B at the left and right ends each having a cross-sectional shape, a small diameter surface 15 at the left and right, a large diameter surface 16 at the center, It has an inclined outer peripheral surface 13 between the small-diameter surface and the large-diameter surface, and is configured as a bilaterally symmetric shaft having a central portion 7A whose diameter increases toward the left and right central portions.

The outer member 11 is made of a metal plate such as a steel pipe for machine structure and has a shape that should be referred to as a left and right constricted cylindrical shape with both left and right ends constricted. 11A and a cylindrical body having a tapered cylindrical portion 11B that is tapered on both the left and right sides in a state where the diameter becomes smaller as the distance from the straight barrel portion 11A in the direction of the axis P increases.
As shown in FIG. 1, the width of the outer member 11 is set to be approximately equal to the total width of the central large-diameter surface 16 and the left and right inclined outer peripheral surfaces 13 and 13.

The elastic member 10 has a width substantially equal to the width dimension of the outer member 11 and has a pair of left and right inclined outer fitting portions 10A and 10A and a left and right central gap portion 10B, and each of the inclined outer fitting portions 10A. It is a composite structure having a shape (like a pulley or a yo-yo) having a substantially H-shaped cross section with a metal intermediate ring 17 integrally formed on the outer peripheral side. Each intermediate ring 17 and the elastic member 10 are often integrated by baking or vulcanization adhesion.
A thin rubber-like annular film portion 10b that covers the central portion 7A and connects the pair of inclined outer fitting portions 10A and 10A is formed in the gap portion 10B from the viewpoint of mold forming convenience and rust prevention of the central shaft 7. However, the annular film portion 10b may be omitted.
That is, as the elastic material 10, the intermediate ring 17 made of a hard material that receives the corresponding portion 11t to be diameter-reduced is provided on the outer peripheral side of the inclined outer fitting portion 10A, and on the inner diameter side of the straight barrel portion 11A. What is made into the shape lacked in the circumferential groove shape regarding the axial center P is used for the location.

  The intermediate wheel 17 includes a large outer peripheral surface 17a having a constant diameter that is fitted into the straight inner peripheral surface 11a of the straight barrel portion 11A, a tapered outer peripheral surface 17b that is fitted into the inclined inner peripheral surface 12 of the inclined cylindrical portion 11B, and an inclined cylinder. A flange-like peripheral portion 17c that receives the end portion of the portion 11B, a tapered inner peripheral surface 17d that is externally fitted to the inclined outer fitting portion 10A with an inclination angle equivalent to that of the tapered outer peripheral surface 17b, and a tapered inner peripheral surface 17d It has a small inner peripheral surface 17e that is fitted on the inclined outer fitting portion 10A with a constant diameter following the small-diameter side end, and is configured to exhibit a cross-sectional shape that is inclined with respect to the axis P as a whole.

In addition, in the state as the elastic bush 6 shown in FIG. 1, each inclined outer fitting portion 10 </ b> A located between the tapered inner peripheral surface 17 d and the inclined outer peripheral surface 13 is in the axial direction P and the radial direction with respect to the axial center P. The compressed part 14 is configured to be compressed in both directions, that is, to be pre-compressed.
As will be described in detail later, this pre-compression is performed in a process of forming the inclined cylindrical portion 11B on the intermediate wheel 17 during assembly (assembly) as the elastic bushing 6, and each inclined outer fitting portion 10A. Is compressed between the inclined inner peripheral surface 12 and the inclined outer peripheral surface 13 to form the compressed portion 14.
The inclined inner peripheral surface 12, the inclined outer peripheral surface 13, and the tapered outer peripheral surface 17b are configured to be the same in the axis P direction and inclined at a uniform angle.

Next, a manufacturing method (how to make) the elastic bush 6 will be described. The elastic bush 6 according to the first embodiment has a center line C and has a bilaterally symmetric shape, and has a clear feature in assembling the outer member 11.
That is, an external fitting process in which the elastic member 10 and the outer member 11 are relatively moved in the axial direction and the outer member 11 is externally fitted to the elastic member 10 that is externally mounted on the central shaft 7 [FIG. After the reference, the corresponding portion 11t of the outer member 11 that is externally mounted on the inclined outer fitting portion 10A is reduced in diameter so that the inclined outer fitting portion 10A is compressed between the corresponding portion 11t and the inclined outer peripheral surface 13. The elastic bushing 6 is produced by performing the compression step [see FIG. 2 (b)].
In order to facilitate the outer fitting process smoothly, the diameter of the outer member 11 is slightly increased, and the outer member 11 is closely fitted to the large outer peripheral surface 17a after the outer fitting process. You may make it perform the whole diameter reduction process of reducing the diameter of the whole 11 before a compression process.

Specifically, first, as shown in FIG. 2A, each inclined outer fitting portion 10A is fitted to each inclined outer peripheral surface 13 and the annular film portion 10b is fitted to the large-diameter surface 16, and each inclined outer fitting portion is fitted. A member in which the intermediate wheel 17, the elastic material 10, and the central shaft 7 are integrated in advance is prepared by means such as baking or vulcanization adhesion in a state where the intermediate wheel 17 is externally fitted to the part 10 </ b> A.
The outer diameter of the elastic material 10 that has not been pre-compressed yet, that is, the diameter of the large outer peripheral surface 17a of the intermediate ring 17 and the inner diameter of the outer member 11 are good in terms of smoothing the outer fitting process. Not necessarily.
In this case, since the left and right inclined outer fitting portions 10A are not compressed yet, the full width D as the elastic material 10 is a portion of the left and right intermediate wheels 17, and the full width D of the intermediate wheels 17 and 17 is the diaphragm. It is clearly longer than the full width d of the outer member 11 in a constant diameter state before processing (D> d).

Now, after the external fitting process is completed, the compression process shown in FIG. In this compression step, the left and right ends of the outer member 11 are reduced in diameter (caulking) by a processing means such as a rotary press so that the diameter decreases toward the end in the direction of the axis P. In the process of forming the inclined outer fitting portion 10A on the left and right by this diameter reduction processing, the corresponding portion 11t that is the end portion of the outer member 11 is forcedly fitted to the taper outer peripheral surface 17b by the diameter reduction processing. The inclined outer fitting portions 10 </ b> A are forcibly moved in the direction of the axis P toward each other via the ring 17.
At that time, the inclined outer fitting portion 10A sandwiched between the inclined inner peripheral surface 12 and the inclined outer peripheral surface 13 has a direction toward the left and right center as the elastic member 10 and the axial center P direction, that is, each outer fitting portion 10A, 10A is compressed in both the direction of approaching each other and the direction of diameter reduction with respect to the axis P, so that the precompressed portion 14 is formed. As a result, the elastic member 10 and the inclined outer peripheral surface 13 having the compressed part 14 are provided for each of the left and right inclined inner peripheral surfaces 12.

In other words, in the compression step, the diameter of the corresponding portion 11t is reduced so that the inclined inner peripheral surface 12 is formed so that the inner diameter of the corresponding portion 11t decreases toward the end in the direction of the axis P. The compression is performed in both the direction of reducing the diameter with respect to P and the direction of the axis P.
In the present embodiment, the elastic member 10 is provided with a metal intermediate ring 17 for receiving a strong compressive force accompanying the diameter reduction processing of the corresponding portion 11t. In the case of receiving a processing stress only in the direction, the elastic material 10 made of only rubber can be used. Further, the elastic member 10 may have a smaller left-right width of the gap portion 10B, may have a smaller amount of dent in the radial direction, or may have no gap portion 10B.

  As shown in FIG. 5, the fitting hole 4 </ b> H of the housing part 4 has an inclined inner peripheral surface 18 whose diameter gradually decreases toward the both ends with the inner diameter of the central portion of the width in the left-right direction (axial center P direction) being increased. It is good also as a cross-sectional concave shape formed and matched with the shape of the outer side member 11. Such a shape is preferable in that the left and right oblique inner circumferential surfaces 18 function as retaining walls in the direction of the axis P of the elastic bushing 6 when assembled with the bolts 9.

[Another Example]
As another example of use of the elastic bush 6, it may be provided at the end of the traction link 20 as shown in FIG. 6.
The traction link 20 is a single torque that is erected over a traction frame 22 supported by a body frame 21 that is a railway vehicle and one of a pair of main support frames 24, 24 of the carriage frame 23. It is comprised as a receiving member.

  The traction frame 22 is formed as a metal member having bifurcated lower end portions 22 a and 22 a straddling the traction link 20 in a state where the traction frame 22 has a flange 22 </ b> A bolted to the vehicle body frame 21. One of the central shafts 7 and 7 of the traction link 20 is bolted to the bifurcated lower end 22a, and the other is bolted to a bifurcated stay 24a protruding from the main support frame 24.

  The traction link 20 includes a traction member 20A formed of a steel pipe material, and metal cylindrical bosses 20B and 20B that are welded and integrated to both ends of the traction member 20A. The elastic bush 6 is equipped with the outer member 11 being fitted inside each. In this case, each cylindrical boss 20B may adopt a half-bolt bolting structure like the housing part 4 shown in FIG. 4, or a structure having a constant-diameter inner peripheral surface in which only the straight barrel part 11A is press-fitted. However, detailed illustrations are omitted for simplicity. Moreover, you may apply this diameter constant inner peripheral surface to the housing part 4 which fits the elastic bush 6 (refer FIG. 5 etc.) of Embodiment 1 internally.

  As described above, according to the elastic bushing 6 of the present invention, the portion of the outer member 11 that is externally fitted to the elastic member 10 has a diameter toward the end in the width direction along the axis P of the outer member 11. The portion of the central shaft 7 that is fitted into the elastic member 10 is inclined with the inclined inner peripheral surface 12 with respect to the axial center P. The elastic member 10 has a compressed portion 14 that is compressed between the inclined inner peripheral surface 12 and the inclined outer peripheral surface 13 while having the inclined outer peripheral surface 13 inclined in the same direction.

  Therefore, conditions such as the inclination angle of the inclined inner peripheral surface 12 and the inclined outer peripheral surface 13 and the amount of compression thereof can be set as appropriate, whereby the rigidity of the compressed portion 14 in the direction of the axis P of the central shaft 7 is increased. It becomes possible to arbitrarily adjust and set the rigidity ratio between (or spring constant) and radial rigidity (or spring constant). Therefore, it is possible for a railway vehicle to be provided with a required rigidity ratio by arbitrarily or arbitrarily setting a rigidity ratio that is a ratio between the rigidity in the direction of the axis P of the central shaft 7 and the rigidity in the radial direction. An elastic bushing 6 can be provided.

Since the intermediate wheel 17 and the inclined outer peripheral surface 13 that sandwich the compressed part 14 have the same inclination angle (taper angle) with respect to the respective axis P, uniform pre-compression is applied to each inclined outer fitting part 10A. It is possible to give Further, since the pre-compression is performed only by the movement of the intermediate ring 17 in the axial center P direction due to the diameter reduction of the corresponding portion (end portion) 11t, the compression stress of the compressed portion 14 is made uniform in this respect as well. There also exists an advantage which can contribute to the performance stabilization as the elastic bush 6. FIG.
Since the inclined cylindrical portion 11B of the outer member (outer ring) 11 and the intermediate ring 17 are fitted with each other in a tapered shape, the outer member 11 and the elastic member 10 do not shift in the axis P direction. Further, the outer member 11 and the fitting hole 4H are also fitted with each other in a tapered shape, so that the elastic bush 6 can be stably supported by the housing part 4 without being displaced.

7 Central axis 10 Elastic material 11 Outer member 11A Straight body cylinder part 11B Inclined cylinder part 11a Inner peripheral surface 11t End part 12 Inclined inner peripheral surface 13 Inclined outer peripheral surface 14 Compressed part
17b Tapered outer peripheral surface
17c bowl-shaped peripheral part P axis

Claims (4)

A central axis having an axis that intersects the vehicle traveling direction, an outer member that is provided on the outer side of the diameter of the central axis, and an elastic member that is interposed between the central axis and the outer member An elastic bush for a railway vehicle comprising:
A portion of the outer member that is externally fitted to the elastic member is an inclined inner circumference that is inclined at a constant angle with respect to the axis so that the diameter decreases toward the end of the outer member in the width direction along the axis. And the portion of the central axis that fits in the elastic material has an inclined outer peripheral surface inclined at a constant angle in the same direction as the inclined inner peripheral surface with respect to the axis,
The elastic member is compressed between the inclined inner peripheral surface and the inclined outer peripheral surface formed by a diameter reducing process in which the inner diameter of the end portion of the outer member becomes smaller toward the end in the axial direction. Having a compressed part,
The compressed portion is equipped in a state where the elastic member is compressed in both the axial direction and the direction of reducing the diameter with respect to the axial center by the diameter reducing process in a state where the elastic material is fitted in the metal outer member. It is,
The end portion is formed in an inclined cylindrical portion having a smaller diameter as it goes to the end in the axial direction, and the elastic material is a tapered outer peripheral surface fitted into the inclined inner peripheral surface of the inclined cylindrical portion; An elastic bush for a railway vehicle having a bowl-shaped peripheral portion that receives a distal end portion of the inclined cylindrical portion .   The inclined inner peripheral surface is formed on each of both end portions in the axial direction of the outer member, and the elastic material having the compressed portion and the inclined outer peripheral surface are provided for each of the inclined inner peripheral surfaces. The elastic bush for rail vehicles according to claim 1 provided.   The outer member has an inclined cylindrical portion formed at both ends in the axial direction with the inclined inner peripheral surface, and an inner peripheral surface parallel to the axial center between the inclined cylindrical portions. The elastic bush for a railway vehicle according to claim 2, wherein the elastic bush is formed of a cylindrical body including   The elastic bush for a railway vehicle according to claim 3, wherein the elastic material has a shape in which a portion located inside the diameter of the straight barrel portion is lacked in a circumferential groove shape with respect to the shaft center.

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