JP5869294B2 - Shaft box support device - Google Patents

Description

  The present invention relates to an axle box support device for a railcar bogie.

  2. Description of the Related Art Conventionally, there is an axial beam type axle box support device as one of the axle box support devices provided on the bogie of the railway vehicle. For example, the axle box support device described in Patent Document 1 includes an axle box body that supports an axle of a railway vehicle, an axle spring that is disposed on the axle box body and elastically supports the carriage frame, and the axle box body to the carriage. And a support arm extending along the side beam of the frame.

Japanese Patent Laid-Open No. 1-160777

  By the way, in a railway vehicle, current is taken from a pantograph, and the current flows through a rail as a return current from a wheel via a grounding device after passing through a device such as a main motor. The current may become a stray current that flows in an unintended route due to a change in the state of the ground or the railway vehicle. When the stray current flows through the bearing, the bearing may be damaged by electric corrosion, resulting in a failure in running the railway vehicle. Therefore, in the axle box support device, it is desirable to insulate the stray current from flowing into the bearing.

  Therefore, as a configuration for preventing current from flowing through the bearing, there is a configuration in which an insulating plate is interposed between the shaft spring seat (upper) arranged on the upper portion of the shaft spring and the shaft spring. In this way, electrical insulation is achieved so that no current flows through the device below the shaft spring. However, this insulating plate may be damaged by a compressive force or an impact caused by a load, and there is a possibility that reliability of insulation is lowered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a shaft box support device capable of realizing an insulating structure that can ensure durability while ensuring electrical insulation.

  In order to solve the above-described problem, a axle box support device according to the present invention is an axle box support device provided on a carriage of a railway vehicle, and an axle box body that supports an axle of the railway vehicle, A pair of shaft springs that are arranged side by side with the axle between the carriage frame and elastically support the carriage frame, and the axle box body is provided with an anti-vibration rubber and an axle spring seat that supports the axle spring. A shaft spring support portion that supports the shaft spring, the shaft spring seat has a protruding portion that protrudes downward, and the shaft spring support portion has an insertion hole through which the protruding portion of the shaft spring seat is inserted; An insulating member that slidably contacts the outer surface of the protruding portion and insulates the shaft spring seat and the shaft spring support portion is disposed on the inner surface of the insertion hole.

  In this shaft box support device, the protruding portion of the shaft spring seat that is in surface contact with the insulating member slides in the vertical direction with respect to the insulating member due to the bending of the anti-vibration rubber due to the load of the shaft spring. Therefore, the insulating member does not directly receive the compressive force due to the load load of the shaft spring. Thus, since an excessive load is not applied to the insulating member, the insulating member can be prevented from being damaged. In addition, the anti-vibration rubber and the insulating member can ensure electrical insulation between the shaft spring seat and the shaft spring seat support, that is, the carriage frame and the shaft box body. Therefore, it is possible to realize an insulating structure that can ensure durability while ensuring electrical insulation.

  It is preferable that the protruding portion is inserted through the insertion hole so that the lower end portion thereof is always positioned below the lower end portion of the insulating member. As a result, the entire surface of the insulating member is always in surface contact with the outer surface of the protruding portion even when there is vertical displacement due to a load. Therefore, since the inner surface of the insulating member does not come into contact with anything other than the outer surface of the protruding portion, that is, the lower end portion (tip portion) of the protruding portion does not come into contact with the inner surface of the insulating member, it is possible to prevent the insulating member from being unevenly worn. Therefore, the durability of the insulating member can be further improved.

  The insulating member is preferably disposed over a part or the entire inner surface of the insertion hole. Thereby, electrical insulation can be ensured more reliably.

  An axle box support device according to the present invention is an axle box support device provided on a carriage of a railway vehicle, and an axle box body that supports an axle of the railway vehicle, and a vibration isolating rubber and an axle spring seat on the axle box body. A shaft spring that elastically supports the carriage frame, and a support arm that extends from the axle box body along the side beam of the carriage frame, and the axle box body protrudes upward. The shaft spring seat has an insertion hole through which the protruding portion of the shaft box body is inserted, and the outer surface of the protruding portion slidably contacts the inner surface of the insertion hole, and the shaft spring seat and the shaft An insulating member for insulating the box is provided.

  In this shaft box support device, the shaft spring seat that is in surface contact with the insulating member slides in the vertical direction with respect to the insulating member provided at the protruding portion by the deflection of the vibration-proof rubber due to the load of the shaft spring. Therefore, the insulating member does not directly receive the compressive force due to the load load of the shaft spring. Thus, since an excessive load is not applied to the insulating member, the insulating member can be prevented from being damaged. In addition, the anti-vibration rubber and the insulating member can ensure electrical insulation between the shaft spring seat and the shaft box body, that is, the bogie frame and the shaft box body. Therefore, it is possible to realize an insulating structure that can ensure durability while ensuring electrical insulation.

  It is preferable that the protruding portion is inserted through the insertion hole so that the lower end portion of the insulating member is always positioned above the lower end portion of the shaft spring seat. As a result, the entire surface of the insulating member is always in surface contact with the inner surface of the insertion hole even if there is vertical displacement due to load. Therefore, since the outer surface of the insulating member does not come into contact with anything other than the inner surface of the protruding portion, that is, the lower end portion of the shaft spring seat and the outer surface of the insulating member do not come into contact, it is possible to prevent the insulating member from being worn away. Therefore, the durability of the insulating member can be further improved.

  The insulating member is preferably disposed over a part or the entire outer surface of the protruding portion. Thereby, electrical insulation can be ensured more reliably.

  ADVANTAGE OF THE INVENTION According to this invention, the insulation structure which can ensure durability can be implement | achieved, ensuring electrical insulation.

It is the figure which looked at the axle box support device concerning a 1st embodiment from the side of a rail car. It is the figure which looked at the axle box support apparatus shown in FIG. 1 from the top. It is the III-III sectional view taken on the line in FIG. It is the figure which looked at the axle box support apparatus which concerns on 2nd Embodiment from the side surface of the rail vehicle. It is the figure which looked at the axle box support apparatus shown in FIG. 4 from the top.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant description will be omitted.

[First Embodiment]
FIG. 1 is a view of the axle box support device according to the first embodiment as viewed from the side of the railway vehicle. FIG. 2 is a top view of the axle box support device shown in FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  As shown in FIG. 1, the axle box support device 1 is a parallel spring type axle box support device provided on a carriage 2 of a railway vehicle, and includes an axle box body 3 that supports an axle 4 of the railway vehicle, and an axle 4. And a pair of shaft springs 5 arranged side by side. In FIG. 1, only one of the axle box support devices 1 provided on the front and rear or on the left and right of the carriage is shown, but the other not shown has the same configuration. FIG. 1 shows a state when the vehicle is empty.

  The axle box 3 has a bearing portion 6 in which a bearing (not shown) that rotatably supports the axle 4 is disposed. The axle box 3 is connected to the side beam 10 a of the carriage frame 10. In addition, seats (shaft spring support portions) 12 that support the pair of shaft springs 5 are provided at the lower portion of the shaft box 3 so as to project on both sides in the front-rear direction of the railway vehicle with the axle 4 (bearing portion 6) interposed therebetween. Yes. The seat 12 includes a first projecting portion 12 a that supports one of the shaft springs 5 and a second projecting portion 12 b that supports the other of the shaft springs 5.

  Each of the pair of shaft springs 5 includes a coil spring 14. One coil spring 14 is disposed closer to the distal end side of the side beam 10 a than the axle box 3. The coil spring 14 is disposed between the first projecting portion 12a and the side beam 10a via shaft spring seats 18a and 18b and an anti-vibration rubber 20 having electrical insulation. More specifically, the coil spring 14 is disposed between the shaft spring seat (upper) 18a and the shaft spring seat (lower) 18b. Between the shaft spring seat (lower) 18b and the first overhanging portion 12a, the above-described anti-vibration rubber 20 and one or more adjustment plates 22 are interposed. The coil spring 14 elastically supports the carriage frame 10 mainly in the vertical direction with respect to the axle box 3.

  The other coil spring 14 is disposed closer to the proximal end side of the side beam 10 a than the axle box 3. The coil spring 14 is disposed between the second projecting portion 12b and the side beam 10a via a shaft spring seat (upper) 18a, a shaft spring seat (lower) 18b, and an anti-vibration rubber 20 having electrical insulation. Has been.

  Then, the insulation structure in the axle box support apparatus 1 is demonstrated. As shown in FIG. 3, the shaft spring seat (lower) 18 b has a convex shape, abuts against the coil spring 14, and extends outwardly from the spring receiving portion 24 a having a circular outer shape. And a projecting portion 24b having a cylindrical shape.

  The first overhanging portion 12a is provided with an insertion hole 26 at a position corresponding to the protruding portion 24b of the shaft spring seat (lower) 18b. The insertion hole 26 has a substantially circular cross section, and the protruding portion 24b of the shaft spring seat (lower) 18b is inserted therethrough. The insertion hole 26 includes a first inner peripheral surface (inner surface) 26a and a second inner peripheral surface 26b having a smaller diameter than the first inner peripheral surface 26a. The diameters of the first and second inner peripheral surfaces 26a and 26b are formed larger than the diameter of the protruding portion 24b, whereby the protruding portion 24b is provided so as to be movable in the vertical direction in the insertion hole 26. .

  A bush (insulating member) 30 is disposed between the first inner peripheral surface 26a of the insertion hole 26 and the outer peripheral surface 24bA of the protruding portion 24b of the shaft spring seat (lower) 18b. The bush 30 is made of an insulating material such as polyurethane, and has a cylindrical shape. The outer peripheral surface 30 a of the bush 30 is disposed along the first inner peripheral surface 26 a of the insertion hole 26. The inner diameter of the bush 30 is substantially the same as or slightly larger than the diameter of the protruding portion 24b. That is, the protrusion 24 b of the shaft spring seat (lower) 18 b is inserted through the bush 30. The bush 30 is placed on a step portion 26c provided between the first inner peripheral surface 26a and the second inner peripheral surface 26b in the insertion hole 26, and is sandwiched between the step portion 26c and the adjustment plate 22. It is fixed.

  The inner peripheral surface 30b of the bush 30 is in surface contact with the outer peripheral surface (outer surface) 24bA of the protrusion 24b of the shaft spring seat (lower) 18b. However, this surface contact is not a complete contact with the surface because they are in a clearance fit relationship, but is a pseudo surface contact state. The protruding portion 24 b is inserted through the insertion hole 26 so that the lower end portion thereof is always positioned below the lower end portion of the bush 30. That is, the vertical movement range (sliding range) of the protrusion 24b is within a range in which the outer peripheral surface 24bA of the protrusion 24b is always in surface contact with the inner peripheral surface 30b of the bush 30 even if there is vertical displacement due to a load load. Is set. Therefore, the lower end portion of the protruding portion 24 b does not contact the inner peripheral surface 30 b of the bush 30.

  With such a configuration, in the axle box support device 1, the first overhanging portion 12 a and the axle spring seat (lower) 18 b are insulated by the anti-vibration rubber 20 and the bush 30. Therefore, the current is insulated by the vibration isolating rubber 20 and the bush 30. Therefore, in the axle box support device 1, current is prevented from flowing through the bearing portion 6.

  As described above, in the present embodiment, the protrusion 24b of the shaft spring seat (lower) 18b that makes pseudo surface contact with the bush 30 that is an insulating member is anti-vibrated due to the load of the shaft spring 5 with respect to the bush 30. The rubber 20 slides up and down due to the bending of the rubber 20. Therefore, the bush 30 does not directly receive the compressive force due to the load load of the coil spring 14. Thus, since an excessive load is not applied to the bush 30, breakage of the bush 30 can be suppressed. In addition, the insulating rubber 20 and the bush 30 can ensure electrical insulation between the carriage frame 10 and the axle box 3. Therefore, since the current is insulated by the vibration isolating rubber 20 and the bush 30, the current is prevented from flowing to the bearing portion 6. As described above, in this embodiment, it is possible to realize an insulating structure that can ensure durability while ensuring electrical insulation.

  Further, the lower end portion of the protruding portion 24 b does not contact the inner peripheral surface 30 b of the bush 30. Therefore, since uneven wear of the inner peripheral surface 30b of the bush 30 is suppressed, breakage of the bush 30 can be further suppressed. As a result, maintenance can be improved.

  Further, since an insulating plate that is thin and easily damaged is not used as in the prior art, it is not necessary to perform an operation carefully so that the insulating plate is not broken when the axle box support device 1 is assembled. Therefore, by using the bush 30, the assembly workability of the axle box support device 1 can be improved. Furthermore, since the bush 30 has durability, the axle box support device 1 can reduce the replacement cost of the insulating member and is excellent in maintainability.

[Second Embodiment]
Next, the second embodiment will be described. FIG. 4 is a view of the axle box support device according to the second embodiment as viewed from the side of the railway vehicle. FIG. 5 is a top view of the axle box support device shown in FIG.

  As shown in FIGS. 4 and 5, the axle box support device 40 is an axle beam type axle box support device provided on a carriage 41 of a railway vehicle, and an axle box body 42 that supports an axle (not shown) of the railway vehicle. And a shaft spring 46 disposed on the shaft box body 42 and a support arm 48 extending from the shaft box body 42 along the side beam 10a of the carriage frame 10. In FIG. 4, only one of the axle box support devices 40 provided on the front and rear or on the left and right of the carriage is shown, but the other not shown has the same configuration. FIG. 4 shows a state when the vehicle is empty.

  The axle box body 42 has a bearing portion 50 that rotatably supports the axle 4. The shaft spring 46 is a coil spring, and includes an inner spring 46a and an outer spring 46b disposed outside the inner spring 46a. The inner spring 46a and the outer spring 46b are disposed in a spring cap 52 provided at the tip of the side beam 10a in the carriage frame 10, and elastically support the carriage frame 10 mainly in the vertical direction with respect to the axle box body 42.

  Specifically, the inner spring 46 a and the outer spring 46 b are disposed between the shaft spring seat (upper) 54 and the shaft spring seat (lower) 55 in the spring cap 52. The shaft spring seat (lower) 55 is supported by the shaft box body 42 with an anti-vibration rubber 56 and an adjustment plate 58 interposed therebetween. The shaft spring seat (lower) 55 has a convex shape upward, abuts against the inner spring 46a and the outer spring 46b, and extends outwardly from the spring receiving portion 55a having a circular outer shape, and the spring receiving portion 55a. It is comprised from the convex part 55b which exhibits a tapered cylindrical shape.

  Next, an insulating structure in the axle box support device 40 will be described. An insertion hole 60 is provided in the shaft spring seat (lower) 55. The insertion hole 60 is formed through the central portion of the shaft spring seat (lower) 55, and has a first inner peripheral surface (inner surface) 60a and a second inner periphery having a smaller diameter than the first inner peripheral surface 60a. It is comprised from the surface 60b and the 3rd internal peripheral surface 60c whose diameter is smaller than the 2nd internal peripheral surface 60b.

  The shaft box body 42 is provided with a substantially cylindrical projecting portion 62 projecting upward at a portion corresponding to the insertion hole 60 of the shaft spring seat (lower) 55. The protrusion 62 is inserted into the insertion hole 60 of the shaft spring seat (lower) 55 via the vibration isolating rubber 56 and the adjustment plate 58. The protrusion 62 has a first outer peripheral surface (outer surface) 62a on the distal end side and a second outer peripheral surface 62b having a diameter larger than that of the first outer peripheral surface 62a on the base end side. The diameter of the second outer peripheral surface 62 b is smaller than the diameter of the first inner peripheral surface 60 a of the insertion hole 60 of the shaft spring seat (lower) 55.

  A bush (insulating member) 64 is provided on the first outer peripheral surface 62 a of the protruding portion 62. The bush 64 is made of an insulating material such as polyurethane and has a cylindrical shape. The bush 64 is disposed along the first outer peripheral surface 62a and is placed on a stepped portion 62c provided between the first outer peripheral surface 62a and the second outer peripheral surface 62b.

  A bushing metal 66 is provided on the upper end side of the bushing 64 (the upper end surface of the protruding portion 62). The bushing metal 66 has a substantially annular shape, is in contact with the upper end surface of the bushing 64, and is fixed to the protruding portion 62 with a bolt B. Thus, the bush 64 is fixed between the stepped portion 62c and the bushing metal 66. The diameter of the bushing metal 66 is smaller than the diameter of the first inner peripheral surface 60 a of the insertion hole 60 of the shaft spring seat (lower) 55. Therefore, the bushing metal 66 does not come into contact with the shaft spring seat (lower) 55.

  The outer diameter of the bush 64 is formed to be substantially the same as or slightly smaller than the diameter of the first inner peripheral surface 60 a of the insertion hole 60 of the shaft spring seat (lower) 55. Thereby, the outer peripheral surface 64 a of the bush 64 is in surface contact with the first inner peripheral surface 60 a of the insertion hole 60 of the shaft spring seat (lower) 55. However, this surface contact is not a complete contact with the surface because they are in a clearance fit relationship, but is a pseudo surface contact state.

  The protrusion 62 provided with the bush 64 is always positioned above the lower end of the bush 64 even when there is vertical displacement due to a load load, compared to the lower end (bottom surface) of the spring receiving portion 55a of the shaft spring seat 55. It is inserted through the insertion hole 60. In other words, the vertical movement range (sliding range) of the shaft spring seat (lower) 55 is such that the outer peripheral surface 64a of the bushing 64 and the first inner peripheral surface 60a of the insertion hole 60 of the shaft spring seat (lower) 55 are loaded. Even if there is a displacement, the surface contact range is set. Therefore, the outer peripheral surface 64 a of the bush 64 does not contact the opening of the insertion hole 60. Further, the shaft box body 42 and the shaft spring seat (lower) 55 are not in contact with each other except the bush 64.

  With such a configuration, in the axle box support device 40, the axle box body 42 and the axle spring seat (lower) 55 are insulated by the vibration isolating rubber 56 and the bush 64. Therefore, the current is insulated by the vibration proof rubber 56 and the bush 64. Therefore, in the axle box support device 40, current is prevented from flowing through the bearing portion 50.

  As described above, in the present embodiment, the load of the shaft spring 46 is applied to the bush 64 in which the shaft spring seat (lower) 55 that makes pseudo surface contact with the bush 64 is disposed on the outer peripheral surface 62a of the protrusion 62. It slides up and down due to the bending of the anti-vibration rubber 20 due to the load. Therefore, the bush 64 does not directly receive the compressive force due to the load load of the coil spring 46. In this way, since an excessive load is not applied to the bushing 64, the bushing 64 can be prevented from being damaged. Moreover, the electric insulation between the bogie frame 10 and the axle box body 42 can be secured by the anti-vibration rubber 56 and the bushing 64.

  Further, the outer peripheral surface 64 a of the bush 64 is always in surface contact with the first inner peripheral surface 60 a of the insertion hole 60 of the shaft spring seat (lower) 55 even if there is a displacement due to a load. Therefore, uneven wear of the outer peripheral surface 64a of the bushing 64 is suppressed, so that the breakage of the bushing 64 can be further suppressed. As a result, maintenance can be improved.

  In addition, since an insulating plate that is thin and easily damaged is not used as in the prior art, it is not necessary to carefully perform an operation so that the insulating plate is not broken when the axle box support device 40 is assembled. Therefore, by using the bush 64, the assembly workability of the axle box support device 40 can be improved. Furthermore, since the bush 64 has durability, the axle box support device 40 can reduce the replacement cost of the insulating material and is excellent in maintainability.

  The present invention is not limited to the above embodiment. For example, in the said embodiment, although the bush which is an insulating member has illustrated the structure integrally formed in the cylindrical shape, the bush may be divided | segmented and comprised.

  In the first embodiment, the mode in which the shaft spring 5 is composed of a pair of coil springs 14 is exemplified. However, the shaft spring 5 is composed of various springs such as a coil spring and a rubber spring, and combinations thereof. It may be.

  DESCRIPTION OF SYMBOLS 1,40 ... Shaft box support apparatus, 2,41 ... Cart, 3,42 ... Shaft box body, 4 ... Axle, 5,46 ... Shaft spring, 12 ... Seat, 12a, 12b ... 1st and 2nd overhang | projection part , 18a ... Shaft spring seat (upper), 18b ... Shaft spring seat (lower), 24b ... Projection, 24bA ... Outer peripheral surface, 26 ... Insertion hole, 26a ... First inner peripheral surface, 30, 64 ... Bush (insulating member) , 48... Support arm, 54... Shaft spring seat (upper), 55... Shaft spring seat (lower), 60... Insertion hole, 60 a. .

Claims (3)

An axle box support device provided on a carriage of a railway vehicle,
An axle box that supports the axle of the railway vehicle;
A pair of shaft springs arranged side by side with the axle between the axle box and the carriage frame and elastically supporting the carriage frame;
The shaft box body has a shaft spring support portion that supports the shaft spring via a vibration-proof rubber and a shaft spring seat that supports the shaft spring.
The shaft spring seat has a protruding portion protruding downward,
The shaft spring support portion has an insertion hole through which the protruding portion of the shaft spring seat is inserted,
The shaft is characterized in that an inner surface of the insertion hole is provided with an insulating member slidably in surface contact with the outer surface of the protruding portion and insulating the shaft spring seat and the shaft spring support portion. Box support device.   The axle box support device according to claim 1, wherein the protruding portion is inserted into the insertion hole so that a lower end portion thereof is always positioned below a lower end portion of the insulating member.   The axle box support device according to claim 1, wherein the insulating member is disposed over a part or the entire inner surface of the insertion hole.

Images