JP6449404B1 - Elastic body bush with pin, railcar bogie, and elastic assembly part - Google Patents

Abstract

An object of the present invention is to provide an elastic bush with a pin, a railcar bogie, and an elastic assembly part, which are excellent in vibration-proof performance and durability of an elastic body, and can easily exchange the elastic body. First and second elastic assemblies 6A and 6B are formed by vulcanizing and bonding first and second elastic bodies to first and second inner cylinder members and first and second outer cylinder members. The first and second elastic assembly parts 6A so that the tapered ring portions 612A and 612B of the first and second inner cylindrical members 61A and 61B are brought into contact with the first and second tapered portions 512A and 512B of the core shaft 5, respectively. , 6B are mounted on the mandrel 5 and accommodated in the annular case 7 so that the first and second elastic bodies are pre-compressed so as not to come off the mandrel 5. [Selection] Figure 4

Description

  The present invention relates to an elastic bush with a pin that connects a first member and a second member that constitute a railway vehicle, a railway vehicle carriage, and an elastic assembly part.

  Railcars vibrate in all directions, up and down, left and right, and front and rear, when traveling. For example, an axle box support device, a vehicle body support device, and the like of a railway vehicle include portions that are connected via pins so that members can move with each other. An elastic body bush is attached to the pin, and vibrations and impacts acting on the pin are absorbed by the elastic body bush. The elastic bush is replaced periodically (for example, every 8 to 12 years) in order to maintain a vibration isolating function that absorbs vibration and shock. When the elastic bushing is vulcanized and bonded to the outer peripheral surface of the pin, it takes time to peel the elastic bushing from the pin, so the elastic bushing and the pin have been exchanged together. However, when the pin has a complicated three-dimensional shape, the manufacturing cost of the pin is high, and the maintenance cost cannot be suppressed by replacing the elastic bush together with the pin.

  Therefore, Patent Document 1 discloses an elastic bush with a pin that holds and holds a rubber buffer ring between the pin and the annular case. The pin includes shaft portions at both axial ends, and a flange is provided at the axial center. Both sides of the flange continue to the shaft portion through a tapered portion whose diameter decreases in the end direction. The rubber shock-absorbing ring is fitted to the taper portion, and is covered with a pair of annular cases from both ends of the pin in the axial direction. Each annular case has a cylindrical shape in which one opening is closed, and a hole through which the shaft portion of the pin is inserted is formed on the closed surface. The pair of annular cases are inserted into the hole portion through the shaft portion of the pin and covered with the rubber shock-absorbing ring, and are pre-compressed between the taper portion by fitting with each other. In the elastic bush with pins, the rubber cushioning ring is fully compressed in the radial direction and the axial direction by pressing the annular case into the fitting hole.

Japanese Patent Laid-Open No. 10-138921

  However, since the elastic bush with a pin described in Patent Document 1 does not attach the rubber buffer ring to the pin and the annular case, the rubber buffer ring is formed from the gap between the shaft portion of the pin and the inner wall of the hole of the annular case. Sometimes jumped out thinly. If the hole of the annular case is made small in order to prevent this jumping out, the pin twisting displacement cannot be generated, and it becomes difficult to absorb the vibration and impact generated in the railway vehicle. In addition, since the rubber shock-absorbing ring is unstable with respect to the pin, the restoring force against the pin twist may be reduced, or the ring-shaped case may be rubbed and damaged.

  The present invention has been made to solve the above-described problems, and has an elastic body bush with a pin that is excellent in vibration-proof performance and durability of an elastic body, and that allows easy replacement of the elastic body, a bogie for railway vehicles, and an elastic body. The object is to provide assembly parts.

One embodiment of the present invention has the following configuration.
(1) In an elastic bush with a pin for connecting a first member and a second member constituting a railway vehicle, a pin and a first attached to an outer peripheral surface of the pin so as to be detachable along an axial direction of the pin An elastic assembly part and a second elastic assembly part, and the first elastic assembly part and the second elastic assembly part are accommodated, and the first elastic assembly part and the second elastic assembly part are arranged on an axis of the pin. An annular member that generates an attracting load that draws along the direction, the pin includes a pin main body portion that is disposed in an attachment hole provided in the first member, and an axial direction of the pin Projecting on both sides of the pin body, the first body has a first end and a second end that are smaller in diameter than the pin body, and the pin body is first from the center of the pin. First diameter change to reduce the diameter toward the end And a second diameter changing portion that decreases in diameter from the center side of the pin toward the second end portion, and the first elastic assembly part has the same shape as the outer peripheral surface of the first diameter changing portion A first inner cylinder member molded into a ring, an elastic member formed into an annular shape, an inner circumferential surface vulcanized and bonded to an outer circumferential surface of the first inner cylinder member, and the first A first outer cylindrical member bonded to the outer peripheral surface of one elastic body by vulcanization, and the second elastic assembly part is formed in the same shape as the outer peripheral surface of the second diameter changing portion. A cylindrical member and an elastic member formed into an annular shape, and an inner peripheral surface is vulcanized and bonded to an outer peripheral surface of the second inner cylindrical member, and an outer peripheral surface of the second elastic body A second outer cylindrical member bonded by vulcanization, and mounting the first elastic assembly part and the second elastic assembly part on the pin. In state, and while the state accommodated in the annular member, Ru said the first outer tubular member second outer tubular member is pre-compressed the first elastic body and the second elastic member are drawn, In a state in which the first elastic assembly part and the second elastic assembly part are not accommodated in the annular member, the first elastic assembly part and the second elastic assembly part are arranged along the axial direction of the pin with the pin body portion. It can be moved in the opposite direction and separated from the pin .

  When the first and second elastic assembly parts mounted on the pin are accommodated in the annular member, the first and second elastic assembly parts are applied with an attracting load. In the first and second elastic assembly members, the first and second outer cylinder members are pulled toward each other in a state where the first and second inner cylinder members are pressed against the first and second diameter changing portions. The elastic body is pre-compressed. In the first and second elastic cylinder members, the repulsive force of the first and second elastic bodies is formed at the contact portion between the first and second inner cylinder members and the first and second diameter changing portions, and the axis of the mandrel. Acting on the pin and cannot be removed from the pin. Therefore, the elastic body bush with the pin can be integrally assembled to the pin without vulcanizing and bonding the first and second elastic bodies to the pin. Also, the first and second elastic assemblies are easily separated from the pins when the annular member is removed and the attractive load is released. Therefore, the first and second elastic bodies can be attached to and detached from the pins without taking the trouble of peeling off the adhesion with the pins. Since the first and second elastic bodies are respectively disposed between the first and second inner cylinder members and the first and second outer cylinder members, the deformation in the axial direction is not limited. Therefore, the first and second elastic bodies can be elastically deformed according to the torsional displacement and the twisting displacement of the pin, and exert a spring force. The first and second elastic bodies are vulcanized and bonded to the first and second inner cylinder members and the first and second outer cylinder members, respectively. It is excellent in durability because it is not rubbed and damaged.

(2) In the elastic body bush with a pin according to (1), it is preferable to have an intermediate member arranged between the first elastic body and the second elastic body. According to this, for example, even when a railway vehicle applies a brake, the intermediate member abuts against the annular member, thereby suppressing excessive deformation of the first and second elastic bodies. Therefore, the elastic bush with a pin improves the durability of the first elastic body and the second elastic body.

(3) In the elastic bush with a pin according to (1) or (2), the first inner cylindrical member that is detachably provided on the pin and is attached to the outer peripheral surface of the first diameter changing portion is dropped. A first drop-off prevention member that prevents the second inner cylinder member that is attached to the outer peripheral surface of the second diameter change portion and that is detachably attached to the pin; It is preferable to have. According to this, the first and second elastic assembly parts are prevented from falling off the pin by maintaining the state in which the first and second inner cylindrical members are in close contact with the first and second diameter changing portions of the pin. More reliably prevented.

(4) In the elastic body bush with a pin according to any one of (1) to (3), the first inner cylindrical member is displaced in a rotation direction about an axis with respect to the pin. A first inner rotation prevention mechanism for preventing, a second inner rotation prevention mechanism for preventing the second inner cylindrical member from being displaced in a rotation direction about an axis with respect to the pin, and the first outer cylindrical member; A first outer rotation prevention mechanism for preventing displacement of the annular member in a rotational direction centered on the axis; and a second outer cylinder member in the rotational direction centered on the axis of the annular member. It is preferable to have a second outer rotation prevention mechanism that prevents displacement. According to this, since the first and second inner cylindrical members are displaced integrally with the pin, and the first and second outer cylindrical members are displaced integrally with the annular member, the first and second elastic bodies are, for example, The spring force can be exerted according to the pin twisting or torsional displacement.

(5) In the elastic bush with a pin according to any one of (1) to (4), the annular member includes a sliding contact portion that is in sliding contact with the first and second outer cylindrical members, and the first A first pressurizing unit that pressurizes the outer cylindrical member toward the second elastic assembly component side, a first pressurizing unit that applies a pressurizing force to the first pressurizing unit, and the second outer cylindrical member that includes the first pressurizing unit. It is preferable to include a second pressurizing unit that pressurizes the elastic assembly part and a second pressurizing unit that applies a pressurizing force to the second pressurizing unit. According to this, the first and second outer cylinder members are inserted into the sliding contact portion, and the first and second pressurizing portions are simply pressurized by the first and second pressure applying portions, so that the first and second Since an attracting load can be applied to the elastic assembly part, the assembly workability is good and it contributes to the detachment and exchangeability of the elastic assembly part.

(6) In the elastic body bush with a pin according to any one of (1) to (4), the first and second elastic assembly parts mounted on the pin are press-fitted into the annular member. Is preferred. According to this, since the first and second elastic assembly parts can be accommodated in the annular member without using the bolt, it is possible to save the trouble of checking the tightening condition of the bolt.

(7) In the elastic bush with a pin according to any one of (1) to (6), it is preferable that the annular member is provided integrally with the first member. According to this, an annular member can be omitted and cost can be reduced.

(8) The bogie for a railway vehicle according to the present invention is characterized in that the elastic bush with a pin described in any one of (1) to (7) is used. According to this, since the durability of the first and second elastic bodies is excellent, the elastic bush with pins can absorb the vibrations and impacts generated in the railway vehicle carriage while maintaining the initial spring characteristics. .

(9) A pin main body portion in which a pin used for the elastic bush with a pin for connecting the first member and the second member constituting the railway vehicle is disposed in an attachment hole formed in the first member; An end portion that is smaller in diameter than the pin body portion and is fixed to the second member; and a diameter changing portion that decreases in diameter from the pin body portion toward the end portion, and is attached to the pin. An inner cylindrical member formed in the same shape as the outer peripheral surface of the diameter changing portion and an elastic member, and the inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner cylindrical member. An elastic body, and an outer cylinder member that is vulcanized and bonded to the outer peripheral surface of the elastic body, and that projects from the inner cylinder member toward the small diameter side of the inner cylinder member, the pin When the outer cylindrical member is accommodated in the annular member while being attached to Displaced in the larger diameter side of the inner tubular member while the elastic member is pre-compressed, the if not accommodated in the annular member, are moved in the opposite direction to the pin body portion along the axial direction of the pin The pin can be separated from the pin .

  When the elastic assembly part having the above configuration is accommodated in the annular member, the elastic assembly part is attached to the pin so as not to come off from the pin, and absorbs vibration and impact of the railway vehicle. When the elastic body is replaced in order to maintain a vibration-proof function that absorbs vibration and shock of the railway vehicle, the elastic body is extracted together with the pin from the annular member. In this case, since the pre-compression of the elastic body is released, the elastic assembly part is easily separated from the pin. Therefore, according to the elastic assembly part having the above-described configuration, it is possible to improve the anti-vibration function of the railway vehicle and the durability of the elastic body, and to easily replace the elastic body.

  Therefore, according to the present invention, it is possible to provide an elastic bush with a pin, a railcar bogie, and an elastic assembly component that are excellent in vibration-proof performance and durability of an elastic body and that can be easily replaced.

It is a top view of the axle box support apparatus provided in the trolley truck according to the embodiment of the present invention. It is a front view of the axle box support apparatus shown in FIG. It is a side view of the bush concerning the embodiment of the present invention. It is AA sectional drawing of the bush shown in FIG. It is BB sectional drawing of the bush shown in FIG. It is a disassembled perspective view of the bush shown in FIG. It is a longitudinal cross-sectional view of a 1st elastic assembly component. It is a figure which shows the state after the pre-compression of a bush. It is a graph which shows the result of the experiment which verifies the stopper function of an intermediate member. It is sectional drawing which shows the modification of an elastic body bush with a pin.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of an elastic body bush with a pin, a railway vehicle carriage, and an elastic assembly part according to the present invention will be described with reference to the drawings.

<Schematic configuration of railcar bogie>
The railcar bogie is constituted by a bogie frame in which left and right side beams along the rail direction are connected by a cross beam (not shown) along the sleeper direction, and a wheel shaft is arranged in front and behind. The wheel shaft is supported by a bearing provided in the shaft box. An elastically supported axle box support device is configured between the axle box and the carriage frame.

  FIG. 1 is a top view of an axle box support device 2 provided in a railway vehicle carriage 1 according to an embodiment of the present invention. FIG. 2 is a front view of the axle box support device 2 shown in FIG. The axle box support device 2 includes an axle box 10, a link 20 that couples and fixes the axle box 10 to the carriage frame 12, and an axle spring that is provided between the axle box 10 and the carriage frame 12 and supports the carriage frame 12. 14.

  As shown in FIGS. 1 and 2, the link 20 is bifurcated on the axle box side, and rubber bushes 4A, 4B, and 4C with pins (hereinafter also referred to as bushes 4A, 4B, and 4C) at the respective end portions. ) Is provided. The bushes 4A, 4B, and 4C are an example of an elastic bush with a pin.

  As shown in FIG. 2, the bushes 4 </ b> A, 4 </ b> B, 4 </ b> C are arranged with respect to the mounting holes 23 a, 23 b, 23 c formed in the end portions 20 a, 20 b, 20 c of the link 20. The bushes 4A and 4B are fixed to the axle box 10 by mounting bolts 22a and 22b, and the bush 4C is fixed to the carriage frame 12 by attachment bolts 22c, whereby the axle box 10 and the carriage frame 12 are moved in the front-rear direction. Are connected via a link 20. In this configuration, the link 20 is an example of a first member that constitutes a railway vehicle, and the axle box 10 and the carriage frame 12 are an example of a second member that constitutes a railway vehicle.

  The shaft spring 14 is disposed between a spring seat 30 disposed on the shaft box 10 and a spring receiver 34 attached to a spring cap 32 formed at the tip of the side beam of the carriage frame 12. In addition to absorbing the vertical movement of the vehicle 10 and adjusting the load balance of the vehicle body, the horizontal movement of the axle box 10 relative to the carriage frame 12 is also absorbed.

  In such a shaft box support device 2, the load in the vertical direction (vertical direction) is supported by the shaft spring 14 and the bushes 4 </ b> A and 4 </ b> B of the link 20 that are arranged offset in the vertical direction. The load in the left-right direction (vehicle width direction) is supported by the horizontal rigidity component of the shaft spring 14 and the bushes 4A, 4B of the link 20 arranged offset in the left-right direction. The load in the front-rear direction (vehicle traveling direction) is supported by the bushes 4A, 4B, 4C of the link 20. In other words, the loads in the vertical direction, the vehicle width direction, and the traveling direction of the vehicle act on the bushes 4A, 4B, and 4C in combination while the railcar is running, and forces in the torsional direction and the twisting direction act.

<Bush configuration>
Next, the configuration of the bushes 4A, 4B, 4C will be described. Since the bushes 4A, 4B, and 4C have the same configuration, the bush 4 will be described below. FIG. 3 is a side view of the bush 4 according to the embodiment of the present invention. 4 is a cross-sectional view of the bush 4 shown in FIG. FIG. 5 is a BB sectional view of the bush 4 shown in FIG. FIG. 6 is an exploded perspective view of the bush 4 shown in FIG. FIG. 7 is a cross-sectional view of the first elastic assembly component 6A. FIG. 8 is a view for explaining pre-compression of the bush 4.

  As shown in FIGS. 4, 5, and 6, the bush 4 includes a mandrel 5, a first elastic assembly component 6 </ b> A, a second elastic assembly component 6 </ b> B, and an annular case 7. The mandrel 5 is an example of a pin, and the annular case 7 is an example of an annular member.

  As shown in FIG. 6, the mandrel 5 is a bar whose outer peripheral surface has a three-dimensional shape. The mandrel 5 is formed by forging or the like in order to increase rigidity against bending, twisting, tension, compression, and the like. The mandrel 5 is shaped symmetrically with respect to the center in the axial direction so that the load is distributed in a balanced manner over the entire mandrel.

  As shown in FIGS. 4 and 5, the mandrel 5 is provided with a main body 51 at the center in the axial direction, and the first end 52 </ b> A and the second end 52 </ b> B are opposite to each other across the main body 51. It protrudes along the axial direction of the shaft 5. The main body 51 is an example of a pin main body. The main body 51 is provided with a larger diameter than the first and second end portions 52A and 52B, and increases the rigidity of the mandrel 5. The bush 4 is attached, for example, through the through holes 53A and 53B formed in the first and second ends 52A and 52B in a state where the main body 51 is disposed in the attachment hole 23a (see FIG. 2) of the link 20. The link 20 and the axle box 10 are coupled by fastening the bolt 22a (see FIG. 2) to the axle box 10 (see FIG. 2). The bush 4 couples the link 20 and the carriage frame 12 in the same manner.

  The main body 51 includes a first tapered portion 512A having a diameter that decreases from the axial center side of the core shaft 5 toward the first end 52A side, and a second end portion 52B side from the axial center side of the core shaft 5 A second taper portion 512B that decreases in diameter toward the top is provided. The first tapered portion 512A is an example of a first diameter changing portion, and the second tapered portion 512B is an example of a second diameter changing portion. That is, the main shaft 51 is smoothly connected to the first end portion 52A via the first taper portion 512A and the second end portion 52B via the second taper portion 512B. This prevents stress from concentrating on the changing part. The taper angles of the first taper portion 512A and the second taper portion 512B are the same, and the compatibility of the elastic assembly parts mounted on the first and second taper portions 512A and 512B is ensured.

  The main body 51 is provided with a large-diameter portion 511 in a columnar shape between the first tapered portion 512A and the second tapered portion 512B. The main body 51 is provided with a first small-diameter portion 513A on the opposite side of the large-diameter portion 511 across the first tapered portion 512A. The first small diameter portion 513A is formed in a columnar shape having a smaller diameter than the large diameter portion 511 and larger than the first end portion 52A. Further, the main body 51 is provided with a second small diameter portion 513B on the opposite side of the large diameter portion 511 with the second taper portion 512B interposed therebetween. The second small diameter portion 513B is formed in a columnar shape having a smaller diameter than the large diameter portion 511 and larger than the second end portion 52B. That is, the main body 51 is provided with the large-diameter portion 511 and the first and second small-diameter portions 513A and 513B so that the first and second elastic assembly parts 6A and 6B can be guided along the axial direction.

  The first elastic assembly component 6A has an integrated sandwich structure in which the first cylindrical rubber 62A is disposed between the first inner cylindrical member 61A and the first outer cylindrical member 63A. The first cylindrical rubber 62A is an example of a first elastic body. The second elastic assembly component 6B has an integrated sandwich structure in which the second cylindrical rubber 62B is disposed between the second inner cylindrical member 61B and the second outer cylindrical member 63B. The second cylindrical rubber 62B is an example of a second elastic body. As shown in FIG. 7, the first and second elastic assembly parts 6A and 6B are detachably provided on the mandrel 5 when not accommodated in the annular case 7, and as shown in FIG. 7, the first and second cylindrical rubbers 62 </ b> A and 62 </ b> B are pre-compressed so as not to come off the core shaft 5. Since the first and second elastic assembly parts 6A and 6B have the same configuration, the configuration of the first elastic assembly part 6A will be described below, and the description of the configuration of the second elastic assembly part 6B will be omitted. .

  As shown in FIG. 7, in the first elastic assembly component 6A, the first inner cylindrical member 61A and the first outer cylindrical member 63A have a cylindrical shape with different diameters. The first inner cylinder member 61A and the first outer cylinder member 63A are made of metal in order to increase rigidity against a radial load. The first cylindrical rubber 62A is an elastic body obtained by molding rubber into a cylindrical shape, and has a uniform radial thickness. The first cylindrical rubber 62A has an inner peripheral surface that is vulcanized and bonded to the outer peripheral surface of the first inner cylindrical member 61A, and an outer peripheral surface that is vulcanized and bonded to the inner peripheral surface of the first outer cylindrical member 63A. Therefore, the first outer cylindrical member 63A can move relative to the first inner cylindrical member 61A along the axial direction.

  61 A of 1st inner side cylinder members are shape | molded by press molding in the same shape as the external shape of the main-body part 51 provided in the mandrel 5. The first inner cylindrical member 61A includes a tapered ring portion 612A that changes the diameter in the axial direction corresponding to the first tapered portion 512A. That is, the tapered ring portion 612A is provided so as to be in surface contact with the first tapered portion 512A.

  In the first inner cylindrical member 61A, a large-diameter ring portion 611A extends from an opening end portion on the large-diameter side of the tapered ring portion 612A. The large-diameter ring portion 611 </ b> A has a cylindrical shape that can be fitted to the large-diameter portion 511 of the mandrel 5. The first inner cylindrical member 61A has a small-diameter ring portion 613A extending from the opening end portion on the small-diameter side of the tapered ring portion 612A. The small-diameter ring portion 613A has a cylindrical shape that can be fitted to the first small-diameter portion 513A of the mandrel 5. Therefore, in the first inner cylindrical member 61A, when the tapered ring part 612A is brought into contact with the first tapered part 512A, the large diameter ring part 611A is supported by the large diameter part 511, and the small diameter ring part 613A is the first. Since it is supported by the small diameter portion 513A, it is attached to the mandrel 5 so as not to rattle in the radial direction.

  On the other hand, the first outer cylindrical member 63A is formed in a cylindrical shape having a diameter larger than that of the first inner cylindrical member 61A, and is disposed outside the first inner cylindrical member 61A with a predetermined interval. The inner peripheral surface of the first outer cylindrical member 63A is formed in a shape corresponding to the first inner cylindrical member 61A. The inner peripheral surface of the first outer cylindrical member 63A is provided with a tapered surface 632A that is inclined corresponding to the tapered ring portion 612A. The inner peripheral surface of the first outer cylindrical member 63A is formed with a large-diameter inner peripheral portion 631A in a cylindrical shape on the large-diameter side of the tapered surface 632A. Further, the inner peripheral surface of the first outer cylindrical member 63A is formed with a small-diameter inner peripheral portion 633A on the small-diameter side of the tapered surface 632A. The first outer cylindrical member 63A is coupled to the first inner cylindrical member 61A through the first cylindrical rubber 62A so that the tapered surface 632A faces the tapered ring portion 612A.

  As shown in FIG. 7, the first cylindrical rubber 62A is vulcanized and molded in a shape that follows the tapered ring portion 612A of the first inner cylindrical member 61A and the tapered surface 632A of the first outer cylindrical member 63A. The first cylindrical rubber 62A is vulcanized and bonded to the first inner cylindrical member 61A and the first outer cylindrical member 63A at the same time. The first cylindrical rubber 62A may be formed at a timing different from molding and bonding, for example, vulcanized and bonded to the first inner cylinder member 61A and the first outer cylinder member 63A after molding.

  The outer peripheral surface 634A of the first outer cylindrical member 63A is configured by a cylindrical surface that can be slidably contacted with the case main body 71 (see FIGS. 4 and 5) of the annular case 7. The outer peripheral surface 634A of the first outer cylindrical member 63A is cut out at the end located on the small diameter inner peripheral portion 633A side (small diameter side of the first inner cylindrical member 61A) to form a pressing surface 635A.

  As shown in FIGS. 3 to 5, the case body 71 of the annular case 7 has a cylindrical shape. The case main body 71 has a first ring plate 72 </ b> A fixed to one end surface by a plurality of bolts 73, and a second ring plate 72 </ b> B fixed to the other end surface by a plurality of bolts 73. As shown in FIGS. 4 and 5, the first and second ring plates 72A and 72B have inner diameters smaller than the inner peripheral surface of the case body 71, and the first and second elastic assembly parts 6A and 6B have first and second inner surfaces. It is made to contact | abut to the press surfaces 635A and 635B provided in 2nd outer side cylinder member 63A, 63B. That is, the annular case 7 is provided so as to generate an attractive load that draws the first and second elastic assemblies 6A and 6B attached to the mandrel 5. Therefore, the first and second elastic assembly parts 6A and 6B can be fitted into the annular case 7 with a gap, and the assembly workability can be improved. Moreover, it can also contribute to the detachability and exchangeability of the elastic assembly part. In this embodiment, the case main body 71 is an example of a sliding contact portion, the first and second ring plates 72A and 72B are examples of first and second pressurizing portions, and the bolt 73 is the first and second pressing portions. This is an example of the two pressure application unit.

  As shown in FIG. 3, the first elastic assembly component 6 </ b> A includes a plurality of case sides provided on the first ring plate 72 </ b> A of the annular case 7, on a plurality of outer recesses 636 </ b> A formed on the first outer cylindrical member 63 </ b> A. By engaging the protrusion 74 </ b> A, rotation with respect to the annular case 7 about the axis is limited. As shown in FIG. 6, the first elastic assembly component 6 </ b> A includes a plurality of inner ridges 614 </ b> A provided on the large-diameter end of the first inner cylinder member 61 </ b> A. By engaging with the shaft-side recess 515 </ b> A, rotation about the axial direction with respect to the core shaft 5 is restricted. Similarly, the second elastic assembly part 6 </ b> B is also restricted from rotating about the axis with respect to the mandrel 5 and the annular case 7. In the present embodiment, the inner ridge 614A and the shaft-side recess 515A are examples of the first inner rotation prevention mechanism, and the inner protrusion 614B and the shaft-side recess 515B are examples of the second inner rotation prevention mechanism. . Further, the outer recess 636A and the case side protrusion 74A are examples of a first outer rotation prevention mechanism, and the outer recess 636B and the case side protrusion 74B are an example of a second outer rotation prevention mechanism.

  Further, as shown in FIG. 6, in the bush 4, the main body 51 of the mandrel 5 is formed with a convex portion 514 along the center of the outer peripheral surface of the large diameter portion 511, and the stopper ring 8 is attached to the convex portion 514. . The stopper ring 8 is an example of an intermediate member. The convex portion 514 has the same axial width as the axial length of the stopper ring 8, and serves as a mark for the mounting position of the stopper ring 8.

  As shown in FIGS. 4 and 5, the stopper ring 8 is disposed between the first elastic assembly part 6A and the second elastic assembly part 6B and protrudes between the first cylindrical rubber 62A and the second cylindrical rubber 62B. Thus, the height in the radial direction is set. That is, the stopper ring 8 suppresses excessive deformation of the first and second cylindrical rubbers 62A and 62B. The stopper ring 8 includes a metal ring member 81 and a rubber buffer member 82. The buffer member 82 is provided on a surface excluding at least the inner peripheral surface of the ring member 81, and prevents damage to the first and second cylindrical rubbers 62A and 62B.

  The bush 4 has C-rings 9A and 9B attached to the outer peripheral surfaces of the first and second small diameter portions 513A and 513B of the mandrel 5 to prevent the first and second elastic assembly parts 6A and 6B from coming off. ing. That is, the first and second elastic assembly parts 6A and 6B are restricted from moving in the axial direction by the convex portion 514 of the mandrel 5, the first and second tapered portions 512A and 512B, and the C rings 9A and 9B. The C ring 9A is an example of a first dropout prevention member, and the C ring 9B is an example of a second dropout prevention member.

<Bush assembly procedure>
The assembly procedure of the bush 4 of this embodiment will be described with reference to FIG. The stopper ring 8 is attached to the convex portion 514 of the mandrel 5. When the second elastic assembly part 6B is inserted into one end opening of the case main body 71 and the second ring plate 72B is fixed to the case main body 71 with the bolt 73, the other end opening of the case main body 71 is connected to the core shaft 5 from the other end opening side. The second end 52B is inserted into the second elastic assembly part 6B, and the second elastic assembly part 6B is attached to the mandrel 5. Then, the first end 52 </ b> A of the mandrel 5 is inserted into the first elastic assembly part 6 </ b> A, and the first elastic assembly part 6 </ b> A is attached to the mandrel 5.

  At this time, since the first and second inner cylindrical members 61A and 61B are formed by press molding in the same shape as the outer peripheral surface of the main body 51 of the mandrel 5, the first and second elastic assembly parts 6A and 6B are It can be easily attached to the mandrel 5. That is, in the first and second elastic assembly parts 6A and 6B, the large-diameter ring portions 611A and 611B and the small-diameter ring portions 613A and 613B are replaced with the large-diameter portion 511 of the core shaft 5 and the first and second small-diameter portions 513A and 513B. While being guided, the tapered ring portions 612A and 612B can be brought into surface contact with the first and second tapered portions 512A and 512B of the mandrel 5, respectively.

  Then, the first ring plate 72A is fixed to the case body 71 with bolts 73, and the C rings 9A and 9B are attached to the mandrel 5. Here, as shown in FIG. 8, when the first and second elastic assemblies 6A and 6B fix the first ring plate 72A to the case body 71, the pressing surfaces 635A and 635B are the first and second rings. It is pressed in the direction approaching by the plates 72A and 72B, and attracting loads F11 and F21 are applied. In the first and second elastic assembly parts 6A and 6B, the first and second inner cylindrical members 61A and 61B contact the tapered ring portions 612A and 612B with the first and second tapered portions 512A and 512B of the core shaft 5, respectively. In addition, since the large-diameter side end is brought into contact with the convex portion 514 of the mandrel 5 and locked, it cannot move in the acting direction of the attracting loads F11 and F21. On the other hand, the first and second outer cylinder members 63A and 63B can move relative to the first and second inner cylinder members 61A and 61B via the first and second cylinder rubbers 62A and 62B. . Therefore, in the first and second elastic assembly parts 6A and 6B, the first and second outer cylinder members 63A and 63B move along the acting direction of the attracting loads F11 and F21. At this time, the first and second cylindrical rubbers 62A and 62B are compressed in accordance with the movement of the first and second outer cylindrical members 63A and 63B.

  Then, the repulsive force F12 of the first cylindrical rubber 62A acts radially inward on the contact portion between the tapered ring portion 612A of the first inner cylindrical member 61A and the first tapered portion 512A of the mandrel 5. As a result, the first elastic assembly part 6 </ b> A is pressed against the core shaft 5 and cannot be removed from the shaft 5. Further, the repulsive force F22 of the second cylindrical rubber 62B acts radially inward on a contact portion between the tapered ring portion 612B of the second inner cylindrical member 61B and the second tapered portion 512B of the mandrel 5. As a result, the second elastic assembly part 6 </ b> B is pressed against the mandrel 5 and cannot be removed from the mandrel 5. That is, the first and second cylindrical rubbers 62 </ b> A and 62 </ b> B can be integrally assembled to the core shaft 5 even if they are not vulcanized and bonded to the core shaft 5.

<Bushing disassembly procedure>
When disassembling the bush 4 and replacing the first and second cylindrical rubbers 62A and 62B, the bolt 73 is loosened and the first and second ring plates 72A and 72B are separated from the case body 71. Then, the first and second elastic assembly parts 6A and 6B are released from the attracting loads F11 and F21. Thereby, the repulsive forces F12 and F22 of the first and second cylindrical rubbers 62A and 62B disappear. Therefore, the C-rings 9A and 9B are removed from the mandrel 5 and the first and second elastic assembly parts 6A and 6B are separated from the main body 51 of the mandrel 5. Then, a new elastic assembly part is attached to the mandrel 5 in the same manner as the above assembly procedure. Therefore, the bush 4 can easily replace the first and second cylindrical rubbers 62A and 62B without taking the trouble of peeling the first and second cylindrical rubbers 62A and 62B from the core shaft 5. Further, since no adhesive or the like remains on the mandrel 5 when the first and second cylindrical rubbers 62A and 62B are replaced, the mandrel 5 can be reused. The mandrel 5 has a complicated three-dimensional shape and is expensive to manufacture. Therefore, being able to reuse the mandrel 5 is beneficial, for example, reducing maintenance costs.

<Bush functions>
The bush 4 assembled as described above is inserted into, for example, the attachment hole 23a (see FIG. 2) of the link 20, and the first and second end portions 52A and 52B of the mandrel 5 are attached to the attachment bolt 22a (FIG. 2). To the axle box 10 (see FIG. 2). At this time, the first and second cylindrical rubbers 62A and 62B are fully compressed. When the railway vehicle travels, vibrations in the vertical direction, the sleeper direction (left-right direction), and the traveling direction of the railway vehicle are generated in the railway vehicle carriage 1, and these act on the bush 4 in a composite manner. That is, the mandrel 5 is torsionally displaced or twisted.

  In the bush 4, the first cylindrical rubber 62 </ b> A is disposed between the cylindrical first inner cylindrical member 61 </ b> A and the cylindrical second outer cylindrical member 63 </ b> B. The same applies to the second cylindrical rubber 62B. Therefore, the mandrel 5 can be displaced while elastically deforming the first and second cylindrical rubbers 62A and 62B, and can easily absorb vibrations and shocks generated in the railway vehicle.

  In addition to this, as shown in FIGS. 4 and 5, the first cylindrical rubber 62A has a shape in which both end surfaces 621A and 622A in the axial direction are concavely curved, and the rubber volume of the first cylindrical rubber 62A is elastically deformed. It is difficult to protrude outside the bush 4. Since the first cylindrical rubber 62A is vulcanized and bonded to the first inner cylindrical member 61A and the first outer cylindrical member 63A, the first cylindrical rubber 62A is not rubbed and damaged by other members during deformation. The same applies to the second cylindrical rubber 62B. Therefore, the bush 4 is excellent in durability of the first and second cylindrical rubbers 62A and 62B. As a result, the spring characteristics of the first and second cylindrical rubbers 62A and 62B can be maintained, and the vibration-proof function for absorbing the vibration and impact of the railway vehicle can be maintained.

  However, as shown in FIG. 8, the first and second elastic assembly parts 6A and 6B are only pressed against the core shaft 5 by the repulsive forces F12 and F22 of the first and second cylindrical rubbers 62A and 62B. When the mandrel 5 is torsionally deformed or torsionally deformed, the first and second inner cylinder members 61A and 61B may slide with respect to the mandrel 5.

  However, the bush 4 is prevented from rotating with respect to the mandrel 5 by the first and second elastic assembly parts 6A and 6B engaging the inner ridges 614A and 614B with the shaft side recesses 515A and 515B. ing. Further, the first and second elastic assembly parts 6A and 6B are prevented from rotating with respect to the annular case 7 by engaging the case-side protrusions 74A and 74B with the outer recesses 636A and 636B. As a result, the bush 4 has the first and second elastic assembly parts 6 </ b> A and 6 </ b> B integrated with the mandrel 5 and the annular case 7, and the first and second elastic assembly parts and the annular case 7 are the same as the mandrel 5. Make a move. Therefore, in the bush 4, a moment acts on the first and second cylindrical rubbers 62 </ b> A and 62 </ b> B according to the angle of twisting displacement and torsional displacement of the mandrel 5. Therefore, the first and second cylindrical rubbers 62A and 62B exhibit spring characteristics according to the displacement of the mandrel 5, and can efficiently absorb vibrations and shocks of the railway vehicle.

  By the way, the railway vehicle has a large mass, and a load acting in the traveling direction of the railway vehicle becomes large during braking. In this case, in the bush 4, the first and second cylindrical rubbers 62A and 62B are strongly compressed between the first and second inner cylindrical members 61A and 61B and the first and second outer cylindrical members 63A and 63B, respectively. If the compression force becomes excessive, the first and second cylindrical rubbers 62A and 62B may not be restored to their original shapes.

  However, in the bush 4, the stopper ring 8 mounted on the mandrel 5 is disposed between the first cylindrical rubber 62A and the second cylindrical rubber 62B. Therefore, at the time of braking, the stopper ring 8 abuts against the case main body 71 of the annular case 7 to suppress excessive deformation of the first and second cylindrical rubbers 62A and 62B. Therefore, the first and second cylindrical rubbers 62A and 62B are less likely to suffer from a problem that they are excessively compressed and lose their restoring force, and the durability is improved.

  The bush 4 is locked to the C-rings 9A and 9B attached to the core shaft 5 by the first and second inner cylindrical members 61A and 61B of the first and second elastic assembly parts 6A and 6B. When the shaft 5 is displaced, the tapered ring portions 612A, 612B of the first and second inner cylindrical members 61A, 61B can be maintained in close contact with the first and second tapered portions 512A, 512B of the core shaft 5. Therefore, the bush 4 can more reliably prevent the first and second elastic assembly parts 6A and 6B from falling off the core shaft 5.

<Functional analysis of stopper ring>
The inventors analyzed the spring characteristics of the cylindrical rubber with respect to the same bush as in this embodiment. For the analysis, an FEM analysis system was used. In the analysis, a load in the front-rear direction (direction orthogonal to the axis) and a load in the left-right direction (axis direction) were applied to the bush, and the deflection of the cylindrical rubber was analyzed. The result is shown in FIG.

  As shown in FIG. 9, with respect to the load in the front-rear direction, the deflection of the cylindrical rubber showed a characteristic close to linear up to about 19.6 kN. However, at higher loads, the increase in deflection was suppressed. That is, at a load of 19.6 kN or more, the cylindrical rubber hits the stopper ring and the deformation was suppressed. Therefore, the bush of this embodiment can suppress that cylindrical rubber deform | transforms excessively and can improve durability of cylindrical rubber.

  In addition, this invention is not limited to the said embodiment, Various application is possible.

  For example, the shape of the pin main body may be spherical. That is, the first and second taper portions 512A and 512B may be hemispherical. In this case, the first and second inner cylindrical members 61A and 61B are preferably formed by forming the tapered ring portions 612A and 612B into a hemispherical shape by press molding.

  For example, the large diameter portion 511 and the first and second small diameter portions 513A and 513B of the mandrel 5 may be omitted. In this case, the first and second inner cylindrical members 61A and 61B may not have the large-diameter ring portions 611A and 611B and the small-diameter ring portions 613A and 613B.

  For example, the first and second elastic assembly parts 6A and 6B may be press-fitted into the cylindrical annular member 7x as in the elastic bush 4x with a pin shown in FIG. In this case, the first and second outer cylindrical members 63A and 63B may not include the pressing surfaces 635A and 635B. However, in this case as well, it is desirable that the annular member 7x is provided with case-side convex strips 74A and 74B that fit into the outer concave strips 636A and 636B of the first and second outer cylindrical members 63A and 63B to prevent rotation. Further, the mandrel 5 may be press-fitted into the stopper ring 8x. Such an elastic body bush 4x with a pin is assembled as follows. First, the stopper ring 8 x is press-fitted into the mandrel 5, and the stopper ring 8 x is fixed to the mandrel 5. Then, the first and second elastic assembly parts 6A and 6B are press-fitted into the annular member 7x, and the first and second elastic assembly parts 6A and 6B are drawn. In the first and second elastic assembly parts 6A and 6B, the first and second cylindrical rubbers 62A and 62B are pre-compressed and cannot be removed from the mandrel 5. Then, the C rings 9 </ b> A and 9 </ b> B are attached to the mandrel 5. In this structure, since the elastic bush 4x with the pin can be accommodated in the annular member 7x without using a bolt, it is possible to save the trouble of checking the tightening condition of the bolt.

  For example, as shown in FIG. 10, in the annular member 7x, a second ring member 90 having a smaller diameter than the first ring member 71x may be disposed inside the first ring member 71x. According to this, the operator pushes the first elastic assembly part 6A toward the second elastic assembly part 6B, for example, thereby pressing the first and second elastic assembly parts 6A and 6B together with the core shaft 5 into the annular member. Can be removed from 7x. Therefore, the elastic bush 4x with the pin can easily disassemble the first and second elastic assembly parts 6A and 6B, the core shaft 5, and the first and second ring members 71x and 90.

  For example, the bush 4 may be disposed in a member connecting portion such as a monolink or a connecting device included in a bogie of a railway vehicle.

  For example, the annular cases 7 may be integrally provided in the attachment holes 23a, 23b, and 23c of the link 20, respectively. That is, the case main body 71 of the annular case 7 is constituted by the inner peripheral surfaces of the mounting holes 23a, 23b, 23c, and the first and second ring plates 72A, 72B are fixed to the link 20 with the bolts 73. good. If the first and second elastic assembly parts 6A, 6B are press-fitted into the mounting holes 23a, 23b, 23c, the first and second ring plates 72A, 72B and the bolts 73 may be omitted. Although it is possible to omit the C-rings 9A and 9B, it is desirable to attach the C-rings 9A and 9B to the mandrel 5 in order to prevent the first and second elastic assemblies 6A and 6B from coming off more reliably.

  For example, the radial height of the convex portion 514 may be increased to the first and second cylindrical rubbers 62A and 62B to function as the stopper ring 8.

  For example, a shaft-side ridge is provided on the mandrel, an inner groove is provided on the inner cylinder member, and they are engaged to prevent the inner cylinder member from rotating relative to the mandrel. . Also, for example, the outer cylindrical member may be provided with outer ridges, the annular case may be provided with case-side ridges, and these may be coupled to prevent the outer cylindrical member from rotating relative to the annular case. . Further, for example, the rotation stopper pin may pass through the annular case, the elastic assembly part, and the mandrel to stop the rotation.

  The first and second inner cylinder members 61A and 61B may be molded by a method other than press molding.

4, 4A, 4B, 4C Rubber bush with pins (an example of an elastic bush with pins)
5 Mandrel (an example of a pin)
6A, 6B First and second elastic assembly parts 7 Annular case (an example of an annular member)
8 Stopper ring (an example of an intermediate member)
9A, 9B C-ring (an example of first and second drop-off prevention members)
51 Pin body portions 52A, 52B First and second end portions 61A, 61B First and second inner cylindrical members 62A, 62B First and second cylindrical rubbers (an example of first and second elastic bodies)
63A, 63B first and second outer cylindrical members 71 annular case (an example of a sliding contact portion)
72A, 72B first and second ring plates (an example of first and second pressure units)
73 bolts (an example of first and second pressure applying portions)
512A, 512B First and second tapered portions (an example of first and second diameter changing portions)
515A, 515B Shaft side recess (an example of first and second inner rotation prevention mechanisms)
614A, 614B Inner ridge (an example of first and second inner rotation prevention mechanisms)
636A, 636B outer recess (an example of first and second outer rotation prevention mechanism)
74A, 74B Case side protrusion (an example of first and second outer rotation prevention mechanism)

Claims (9)

In the elastic bush with a pin for connecting the first member and the second member constituting the railway vehicle,
idea,
A first elastic assembly component and a second elastic assembly component that are detachably mounted on the outer peripheral surface of the pin along the axial direction of the pin ;
The first elastic assembly part and the second elastic assembly part are accommodated, and an attraction load is generated to draw the first elastic assembly part and the second elastic assembly part along the axial direction of the pin. An annular member;
Having
The pin is
A pin main body disposed in a mounting hole provided in the first member;
Projecting on both sides of the pin main body along the axial direction of the pin, and having a first end and a second end provided with a smaller diameter than the pin main body;
The pin main body portion has a first diameter changing portion that decreases in diameter from the center side of the pin toward the first end portion, and a first diameter changing portion that decreases in diameter from the center side of the pin toward the second end portion. Including a two-diameter changing portion,
The first elastic assembly part is:
A first inner cylindrical member molded in the same shape as the outer peripheral surface of the first diameter changing portion;
A first elastic body in which an elastic member is formed in an annular shape, and an inner peripheral surface is vulcanized and bonded to an outer peripheral surface of the first inner cylindrical member;
A first outer cylindrical member vulcanized and bonded to the outer peripheral surface of the first elastic body;
Having
The second elastic assembly part is:
A second inner cylindrical member formed in the same shape as the outer peripheral surface of the second diameter changing portion;
An elastic member formed into an annular shape, and an inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the second inner cylindrical member; and
A second outer cylindrical member vulcanized and bonded to the outer peripheral surface of the second elastic body;
Having
In a state where the first elastic assembly part and the second elastic assembly part are mounted on the pin and accommodated in the annular member, the first outer cylindrical member and the second outer cylindrical member are drawn together. while the first elastic member and the second elastic member Ru is pre-compressed, in a state where no housing the second resilient assembly and the first elastic assembly to said annular member, the said first elastic assembly first 2. An elastic bush with a pin , wherein two elastic assembly parts can be separated from the pin by moving in the direction opposite to the pin main body along the axial direction of the pin. In the elastic body bush with a pin according to claim 1,
An elastic bush with a pin, comprising an intermediate member disposed between the first elastic body and the second elastic body. In the elastic body bush with a pin according to claim 1 or claim 2,
A first drop-off preventing member that is detachably provided on the pin and prevents the first inner cylindrical member from being dropped on the outer peripheral surface of the first diameter changing portion;
A second drop-off preventing member that is detachably provided on the pin and that prevents the second inner cylindrical member from being dropped on the outer peripheral surface of the second diameter changing portion. Body bush. In the elastic body bush with a pin according to any one of claims 1 to 3,
A first inner rotation prevention mechanism for preventing the first inner cylindrical member from being displaced in a rotation direction around an axis with respect to the pin;
A second inner rotation prevention mechanism for preventing the second inner cylindrical member from being displaced in a rotation direction centered on an axis with respect to the pin;
A first outer rotation prevention mechanism for preventing the first outer cylindrical member from being displaced in a rotational direction around an axis with respect to the annular member;
An elastic bush with a pin, comprising: a second outer rotation prevention mechanism that prevents the second outer cylindrical member from being displaced in a rotational direction about an axis with respect to the annular member. In the elastic body bush with a pin given in any 1 paragraph of Claims 1 thru / or 4,
The annular member is
A sliding contact portion in sliding contact with the first and second outer cylindrical members;
A first pressure member that pressurizes the first outer cylindrical member toward the second elastic assembly part;
A first pressure applying unit that applies pressure to the first pressurizing unit;
A second pressure member that pressurizes the second outer cylindrical member toward the first elastic assembly part;
An elastic bush with a pin, comprising: a second pressure applying unit that applies pressure to the second pressurizing unit. In the elastic body bush with a pin given in any 1 paragraph of Claims 1 thru / or 4,
An annular member is an elastic bush with a pin, into which the first and second elastic assemblies mounted on the pin are press-fitted. In the elastic body bush with a pin according to any one of claims 1 to 6,
The elastic bush with a pin, wherein the annular member is provided integrally with the first member.   A bogie for a railway vehicle, wherein the elastic bush with a pin according to any one of claims 1 to 7 is used. A pin main body portion in which a pin used in an elastic bush with a pin for connecting a first member and a second member constituting a railway vehicle is disposed in an attachment hole formed in the first member; and the pin main body An end portion that is smaller in diameter than the portion and fixed to the second member, and a diameter changing portion that decreases in diameter from the pin main body portion toward the end portion, and is attached to the pin.
An inner cylindrical member formed in the same shape as the outer peripheral surface of the diameter changing portion;
An elastic member formed into an annular shape, and an elastic body whose inner peripheral surface is vulcanized and bonded to the outer peripheral surface of the inner cylindrical member;
An outer cylinder member that is vulcanized and bonded to the outer peripheral surface of the elastic body, and is arranged so as to protrude toward the small diameter side of the inner cylinder member with respect to the inner cylinder member;
Having
When the outer cylindrical member is accommodated in the annular member in a state of being attached to the pin, the outer cylindrical member is displaced to the large diameter side of the inner cylindrical member, and the elastic body is precompressed, but is not accommodated in the annular member. In this case, the elastic assembly part can be separated from the pin by moving in the direction opposite to the pin main body along the axial direction of the pin .

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