JP2017065591A - Railway vehicle underframe structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suitable railway vehicle underframe structure capable of securing sufficient strength even when large stress is generated on a cap beam.SOLUTION: This railway vehicle underframe structure is provided with: an underframe; a cap beam; and a middle beam joined to the rough center of the cap beam in a vehicle width direction. A screw seat is provided to the cap beam, and engaged with a bolt for fixing a center pin to the cap beam. The cap beam has: a pair of hollow members spaced from each other in a vehicle longitudinal direction, the internal spaces thereof extending in a vehicle width direction; and a connection member that connects the pair of hollow members to each other. Each of the hollow members has: a top plate part; a bottom plate part; an inner vertical plate part connecting the ends of the top plate part and the bottom plate part to each other; an outer vertical plate part connecting the other ends of the top plate part and the bottom plate part to each other; and an intermediate vertical plate part disposed between the inner vertical plate part and the outer vertical plate part so as to connect the top plate part and the bottom plate part to each other. The screw seat is provided in, among the internal spaces, a space defined by the top plate part, the bottom plate part, the inner vertical plate part, and the intermediate vertical plate part.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a frame structure for a railway vehicle.

  In a frame of a vehicle body in a railway vehicle, a center pin connected to the carriage is bolted to the lower surface of the pillow beam. The traction force or braking force of the carriage (hereinafter also simply referred to as “traction force”) is transmitted from the carriage to the vehicle body via the center pin. Here, the pillow beam may be configured by a plurality of hollow extruded shapes extending in the vehicle width direction and a connecting plate that connects the plurality of hollow extruded shapes in the vehicle longitudinal direction (for example, Patent Document 1). reference).

Japanese Patent No. 5710376

  However, the cross section of the hollow extruded profile of Patent Document 1 is substantially rectangular, and as the load due to the traction force of the carriage acting on the pillow beam increases, the hollow extruded profile tends to deform into a substantially parallelogram. Therefore, it is necessary to suppress the deformation of the hollow extruded shape member and ensure the strength of the pillow beam. Further, since the intermediate beam extending in the longitudinal direction of the vehicle is joined to the pillow beam at the center in the vehicle width direction, when a large stress is generated in the pillow beam due to the load, the pillow beam is joined to the pillow beam. It is also necessary to ensure the strength of the joint with the intermediate beam.

  Accordingly, an object of the present invention is to provide a suitable railcar frame structure that ensures a sufficient strength even when a large stress occurs in the pillow beam.

  A vehicle body of a railway vehicle according to one aspect of the present invention includes a frame having a pillow beam extending in a vehicle width direction, and a middle beam that is joined to a substantially center of the pillow beam in the vehicle width direction and extends in a vehicle longitudinal direction, A screw seat that is provided on the pillow beam and is screwed to a bolt that fixes a center pin to the pillow beam. The pillow beam is arranged at intervals in the longitudinal direction of the vehicle, and the inner space of the pillow beam is a vehicle. A pair of hollow members extending in the width direction; and a connecting member for connecting the pair of hollow members to each other, each of the pair of hollow members being spaced apart from the upper plate portion and the upper plate portion A lower plate portion, an inner vertical plate portion that connects one end portions of the upper plate portion and the lower plate portion, and an outer vertical plate portion that connects the other end portions of the upper plate portion and the lower plate portion, An intermediate vertical plate that is disposed between the inner vertical plate portion and the outer vertical plate portion and connects the upper plate portion and the lower plate portion to each other. If has the screw seat, said of the internal space is provided in a space defined between the upper plate and the lower plate portion and the inner vertical plate portion and the intermediate vertical plate portion.

  According to the above configuration, since the hollow member of the pillow beam has the intermediate vertical plate portion that connects the upper plate portion and the lower plate portion between the inner vertical plate portion and the outer vertical plate portion, the traction force It is possible to suppress the hollow member from being deformed into a substantially parallelogram shape when a load in the longitudinal direction of the vehicle is applied, and to secure the strength of the pillow beam. A space in which a screw seat that is screwed to a bolt that fixes the center pin to the pillow beam is partitioned by an upper plate portion, a lower plate portion, an inner vertical plate portion, and an intermediate vertical plate portion in the internal space of the hollow member. Therefore, even when a heavy load is applied to the pillow beam via the center pin and a large stress is generated in the intermediate vertical plate during sudden acceleration / deceleration, The stress can be prevented from directly reaching the joint portion of the pillow beam that is joined to the center of the vehicle in the vehicle width direction, and fatigue of the joint portion of the pillow beam and the middle beam can be suppressed. Therefore, in the undercarriage structure of a railway vehicle, sufficient strength can be ensured even when a large stress occurs in the pillow beam.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where big stress generate | occur | produces in a pillow beam, the suitable frame structure of a rail vehicle by which sufficient intensity | strength is ensured can be provided.

It is a top view of the frame structure of the rail vehicle which concerns on 1st Embodiment. It is the II-II sectional view taken on the line of FIG. It is drawing explaining the manufacture procedure of the hollow member shown in FIG. It is the IV-IV sectional view taken on the line of FIG. It is a figure equivalent to FIG. 2 of the frame structure of the rail vehicle which concerns on 2nd Embodiment. It is a figure equivalent to FIG. 2 of the frame structure of the rail vehicle which concerns on 3rd Embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or corresponding element through all the figures, and the detailed description which overlaps is abbreviate | omitted.

(First embodiment)
FIG. 1 is a plan view of the frame structure 10 of the railcar 1 according to the first embodiment. As shown in FIG. 1, the frame structure 10 provided on the vehicle body 2 includes a frame 5. The underframe 5 includes a pair of side beams 11, end beams 12, pillow beams 13, and a pair of middle beams 14 and 15. The beams 11 to 15 constituting the underframe 5 are all made of an aluminum alloy, and a high-strength aluminum alloy having a particularly high tensile strength is used as the material, but the material is not limited to this. Moreover, the vehicle body 2 of this embodiment is a vehicle body of a locomotive for pulling a connected passenger car or the like as an example, and the power unit thereof is a motor or an engine. The power unit mounted on the vehicle body 2 is not particularly limited.

  The pair of side beams 11 each extend in the vehicle longitudinal direction. The end beams 12 extend in the vehicle width direction and connect one end portions of the pair of side beams 11 in the vehicle longitudinal direction. The pillow beam 13 extends in the vehicle width direction inward of the longitudinal direction of the vehicle from the end beam 12. The pillow beam 13 is provided with a screw seat 6 to which a bolt 7 for fixing a center pin 4 (see FIG. 2) connected to the carriage 3 is screwed. The screw seat 6 is fastened to the pillow beam 13 of the underframe 5 with fastening members (for example, screws) described later, whereby the underframe structure 10 (hereinafter referred to as the underframe structure 10) of the railway vehicle 1 is configured. The

  The pair of middle beams 14 and 15 respectively connect the end beam 12 and the pillow beam 13 in the vehicle longitudinal direction. Here, the vehicle longitudinal direction other end portions 14b and 15b of the middle beams 14 and 15 are joined to the approximate center of the pillow beam 13 in the vehicle width direction by welding. A reinforcing plate 16 is fixed to the side surfaces of the other ends 14b, 15b in the vehicle longitudinal direction of the intermediate beams 14, 15 and the end surface of the pillow beam 13 on one side in the vehicle longitudinal direction. The attachment strength between 14, 15 and the pillow beam 13 is improved.

  2 is a cross-sectional view taken along line II-II in FIG. As shown in FIG. 2, the pillow beam 13 includes a pair of hollow members 21 and 22, an upper connecting member 23, and a lower connecting member 24. The hollow members 21 and 22 extend in the vehicle width direction with an interval in the vehicle longitudinal direction. The upper ends of the hollow members 21 and 22 are connected to each other via an upper connecting member 23, and the lower ends of the hollow members 21 and 22 are connected to each other via a lower connecting member 24. Both the upper connecting member 23 and the lower connecting member 24 are plate members having the same dimensions in the vehicle width direction as the hollow members 21 and 22. In addition, since a pair of hollow members 21 and 22 are mutually symmetrical shapes on the basis of the axial center J of the center pin 4, the shape of the hollow member 21 is demonstrated below.

  In the present embodiment, the hollow member 21 includes a first member 31 and a second member 32 joined to the first member 31 by welding. Each of the first member 31 and the second member 32 is an extruded shape formed by extruding an aluminum alloy. Here, when the first member 31 and the second member 32 are formed by extrusion molding, the extrusion direction is the vehicle width direction. And the internal space S1, S2 penetrated in the vehicle width direction is formed in the hollow member 21 which consists of the 1st member 31 and the 2nd member 32 which were formed by extrusion molding in this way. That is, the direction in which the internal spaces S1, S2 extend is the same vehicle width direction as the extrusion direction.

  The hollow member 21 including the first member 31 and the second member 32 includes an upper plate portion 21a, a lower plate portion 21b, an inner vertical plate portion 21c, an outer vertical plate portion 21d, and an intermediate vertical plate portion 21e. Have. Here, the first member 31 of the present embodiment includes a first upper plate portion 31a, a first lower plate portion 31b, an inner vertical plate portion 21c, and an intermediate vertical plate portion 21e, thereby having a substantially quadrangular cross section. have. The first member 31 has an internal space S1 defined by a first upper plate portion 31a, a first lower plate portion 31b, an inner vertical plate portion 21c, and an intermediate vertical plate portion 21e. On the other hand, the second member 32 includes a second upper plate portion 32a, a second lower plate portion 32b, and an outer vertical plate portion 21d, thereby having a substantially horseshoe shape in cross section.

  A screw seat 6 is provided in the internal space S1 of the first member 31. Specifically, by inserting a plurality of fastening members (for example, screws) into a screw insertion hole 6a (see FIG. 1) formed in the screw seat 6 from below, the screw seat 6 has a first lower plate portion 31b. Is positioned. Hereinafter, the internal space S1 formed in the first member 31 is referred to as a first space. The screw seat 6 is a steel member and has a substantially rectangular parallelepiped shape that is long in the vehicle width direction. Further, the bolt 7 that fixes the center pin 4 is inserted into the bolt insertion hole 6 b formed in the screw seat 6 from below the pillow beam 13, so that the screw seat 6 is screwed into the bolt 7.

  The upper plate portion 21 a is configured by welding the first upper plate portion 31 a of the first member 31 and the second upper plate portion 32 a of the second member 32. The lower plate portion 21b that is spaced downward from the upper plate portion 21a is configured by welding the first lower plate portion 31b of the first member 31 and the second lower plate portion 32b of the second member 32. The An insertion hole 31ba into which the bolt 7 is inserted is formed in the first lower plate portion 31b.

  The inner vertical plate portion 21c connects one end portions of the first upper plate portion 31a and the first lower plate portion 31b to each other. Specifically, the end portion on the upper connecting member 23 side of the first upper plate portion 31a. And the end on the lower connecting member 24 side of the first lower plate portion 31b are connected to each other. Further, the outer vertical plate portion 21d connects the other ends of the first upper plate portion 31a and the first lower plate portion 31b to each other. Specifically, the first member 31 of the second upper plate portion 32a is connected. And the end of the second lower plate portion 32b opposite to the first member 31 are connected to each other. The intermediate vertical plate portion 21e is disposed between the inner vertical plate portion 21c and the outer vertical plate portion 21d in the longitudinal direction of the vehicle, and connects the first upper plate portion 31a and the first lower plate portion 31b to each other. .

  In the hollow member 21, a joint portion W <b> 1 between the first member 31 and the second member 32 is disposed on the outer vertical plate portion 21 d side with respect to the intermediate vertical plate portion 21 e. Specifically, the first member 31 and the second member 32 are joined at a position between the intermediate vertical plate portion 21e and the outer vertical plate portion 21d. When the second member 32 is thus welded to the first member 31, the hollow member 21 includes a second upper plate portion 32a, a second lower plate portion 32b, an outer vertical plate portion 21d, and an intermediate vertical plate portion 21e. An internal space S2 partitioned by is formed. Hereinafter, the internal space S2 formed by the intermediate vertical plate portion 21e of the first member 31 and the second member 32 is referred to as a second space.

  In addition, the other end portion 14b in the vehicle longitudinal direction of the intermediate beam 14 is joined to the hollow member 21 by welding. The intermediate beam 14 connects the upper wall portion 14c, the lower wall portion 14d spaced downward from the upper wall portion 14c, and the vehicle width direction end portion of the upper wall portion 14c and the vehicle width direction end portion of the lower wall portion 14d. And one vertical wall portion 14e. A space defined by the upper wall portion 14c, the lower wall portion 14d, and the vertical wall portion 14e is opened outward in the vehicle width direction.

  Here, an inclined surface that is inclined with respect to a horizontal plane is formed on the end surface of the vehicle longitudinal direction other end portion 14b of the intermediate beam 14, and the inclined surface of the vehicle longitudinal direction other end portion 14b is connected to the outer vertical plate portion 21d. It forms a groove and is welded. That is, the joint portion W2 between the intermediate beam 14 and the pillow beam 13 is provided at a position that is separated outward in the vehicle longitudinal direction from the intermediate vertical plate portion 21e. The intermediate beam 15 is welded to the outer vertical plate portion 21d of the hollow member 21 so as to be symmetric with respect to the intermediate beam 14 and the reinforcing plate 16.

  FIG. 3 is a drawing for explaining the manufacturing procedure of the hollow member 21 shown in FIG. FIG. 3A is a front view of the members 31 and 32 before the first member 31 and the second member 32 are welded. FIG. 3B is a front view of the hollow member 21 immediately after the first member 31 and the second member 32 are welded. FIG. 3C is a front view of the hollow member 21 cut after the first member 31 and the second member 32 are welded.

  As shown in FIG. 3A, in the first member 31, the first upper plate portion 31a has a first protruding portion 31c that protrudes upward from a portion of the upper surface away from both ends in the vehicle longitudinal direction. doing. The end surface R10 on the second member 32 side of both end surfaces in the vehicle longitudinal direction of the first projecting portion 31c is an inclined surface that is inclined in a direction away from the second member 32 with respect to the vertical surface with the lower end as a base point. In the first upper plate portion 31a, the plate thickness dimension of the portion until the first protruding portion 31c protrudes from the edge on the second member 32 side is the plate thickness size of the portion where the first protruding portion 31c is provided. Smaller than. That is, in the first upper plate portion 31a, the upper portion is cut out so as to be thin in the vicinity of the end surface R11 facing the second upper plate portion 32a. In the present embodiment, the upper portion of the first upper plate portion 31a is notched so as to be thin even in the vicinity of the end surface R12 facing the upper connecting member 23.

  Further, in the second member 32, the second upper plate portion 32a protrudes upward from the portion of the upper surface away from the end portion on the first member 31 side, approximately equal to the protruding amount of the first protruding portion 31c. It has the 2nd protrusion part 32c to do. The end surface R20 on the first member 31 side of the second projecting portion 32c is an inclined surface that is inclined in a direction away from the first member 31 with respect to the vertical surface with the lower end as a base point. And in the 2nd upper board part 32a, the board thickness dimension of the part until the 2nd protrusion part 32c protrudes from the edge by the side of the 1st member 31 is the board thickness dimension of the part in which the 2nd protrusion part 32c was provided. Smaller than. That is, in the second upper plate portion 32a, the upper portion is cut out so as to be thin in the vicinity of the end surface R21 facing the first upper plate portion 31a.

  Here, when the first member 31 and the second member 32 are formed by extrusion molding so that a material (in this example, an aluminum alloy) has a desired cross-sectional shape, of the plate portions constituting the members 31 and 32 If the plate thickness dimensions of the opposing plate portions are different, the flow rate of the molten metal flowing in the mold during molding will vary. As a result, twisting occurs when the material is extruded, and the molding accuracy decreases. Therefore, in the first member 31, the first upper plate portion 31a and the first lower plate portion 31b in the portion where the first protrusion 31c is provided have the same plate thickness dimension t1, and the inner vertical plate portion 21c and the intermediate vertical plate portion 21c. The thickness of the plate portion 21e is equal to t2. 3A and 3B, in the first member 31, the plate thickness dimension of the first upper plate portion 31a and the first lower plate portion 31b in the portion where the first protruding portion 31c is provided. t1 is substantially the same, and the plate thickness dimension t2 of the inner vertical plate portion 21c and the intermediate vertical plate portion 21e facing each other in the longitudinal direction of the vehicle is substantially the same. Further, in the second member 32, the plate thickness dimension t3 of the second upper plate portion 32a and the second lower plate portion 32b of the portion where the second protrusion 32c is provided is substantially the same. In the present embodiment, the plate thickness dimension t3 of the second member 32 is equal to the plate thickness dimension t1 of the first member 31.

  Further, the end surfaces R11 and R21 of the first upper plate portion 31a and the second upper plate portion 32a facing each other are inclined with respect to the vertical plane. The end surface R11 of the first upper plate portion 31a and the end surface R21 of the second upper plate portion 32a are openings that form a V-shaped groove when the first upper plate portion 31a and the second upper plate portion 32a are welded. It will be the front. The end surfaces R13 and R22 of the first lower plate portion 31b and the second lower plate portion 32b facing each other are also inclined with respect to the vertical plane. The end surface R13 of the first lower plate portion 31b and the end surface R22 of the second lower plate portion 32b are openings that form a V-shaped groove when the first lower plate portion 31b and the second lower plate portion 32b are welded. It will be the front.

  Further, the end surface R12 of the first upper plate portion 31a and the end surface R14 of the first lower plate portion 31b are also inclined with respect to the vertical plane, and are V-shaped when the first member 31 and the connecting members 23, 24 are welded. It becomes a groove surface constituting a groove of a shape. The second member 32 includes an extended portion 32d extending from the end on the first member 31 side toward the first member 31 on the lower surface of the second upper plate portion 32a, and an upper surface of the second lower plate portion 32b. Of these, an extending portion 32 e extending from the end on the first member 31 side toward the first member 31 is provided.

  As shown in FIG. 3B, the end of the first member 31 on the second member 32 side abuts on the upper surface of the extending portion 32d, and the first lower plate portion 31b on the second member 32 side. When the edge part of this contact | abuts the lower surface of the extension part 32e, the V-shaped groove | channel extended in a vehicle width direction is comprised by the above-mentioned groove surface. Here, as described above, in the vicinity of the groove surfaces (end surfaces) R11 and R21 of the first upper plate portion 31a and the second upper plate portion 32a, the upper portions are cut out so as to be thin. In other words, a step portion is formed between the V-shaped groove and the upper surfaces of the protruding portions 31c and 32c.

  When the operator welds the first upper plate portion 31a and the second upper plate portion 32a, the groove surface is formed by the step portion formed between the groove and the upper surfaces of the projecting portions 31c and 32c as described above. Welding can be performed using the upper corner of R11 and R21 as a mark, and the amount of weld bead required for welding the first member 31 and the second member 32 can be recognized. Therefore, the upper surface of the joint portion W1 between the first upper plate portion 31a and the second upper plate portion 32a is lower than the upper surfaces of the first protruding portion 31c and the second protruding portion 32c.

  As shown in FIG.3 (c), after welding the 1st member 31 and the 2nd member 32, the 1st protrusion part 31c and the 2nd protrusion part 32c are cut by cutting. When the first protrusion 31c and the second protrusion 32c are cut, the thickness t11 of the first upper plate 31a is finally smaller than the thickness t1 of the first lower plate 31b, and the second upper The plate thickness dimension t21 of the plate portion 32a is also smaller than the plate thickness dimension t3 of the second lower plate portion 32b. That is, in the hollow member 21 of the present embodiment, the plate thickness dimension of the upper plate portion 21a is smaller than the plate thickness dimension of the lower plate portion 21b. The first protrusion 31c and the second protrusion 32c may remain without being cut.

  4 is a cross-sectional view taken along line IV-IV shown in FIG. As shown in FIG. 4, air spring intake seats 19 to which air springs (not shown) are connected are provided at both ends of the pillow beam 13 in the vehicle width direction. The air spring intake seat 19 is a substantially conical member and has a function of supplying compressed air from an air tank provided in the vehicle body 2 to the air spring.

  The pillow beam 13 is provided with a plurality of reinforcing members 25 that connect the upper connecting member 23 and the lower connecting member 24 in the vertical direction. The reinforcing member 25 has an inverted L-shaped cross-sectional shape when viewed from the longitudinal direction of the vehicle, and has a function of reinforcing the strength of the pillow beam 13. In the present embodiment, the reinforcing member 25 is provided on the inner side in the vehicle width direction with respect to the plurality of first reinforcing members 25a and 25b provided on both sides in the vehicle width direction of the air spring intake seat 19 and the first reinforcing member 25a. A plurality of second reinforcing members 25c. Here, the second reinforcing member 25c is provided at a position shifted outward in the vehicle width direction from the screw seat 6 when viewed from the longitudinal direction of the vehicle. That is, all of the reinforcing members 25a to 25c are provided at positions that do not overlap with the screw seat 6 provided in the first space S1 when viewed from the vehicle longitudinal direction.

  The underframe structure 10 of the railway vehicle 1 configured as described above has the following effects.

  Since the hollow member 21 of the pillow beam 13 has an intermediate vertical plate portion 21e that connects the upper plate portion 21a and the lower plate portion 21b between the inner vertical plate portion 21c and the outer vertical plate portion 21d, When a load in the longitudinal direction of the vehicle such as a traction force or a braking force (hereinafter referred to as a traction force) of the carriage 3 is applied, the cross-sectional shape of the hollow member 21 is prevented from being deformed into a substantially parallelogram, The strength of 13 can be ensured. In addition, the screw seat 6 that is screwed into the bolt 7 that fixes the center pin 4 includes the upper plate portion 21a, the lower plate portion 21b, the inner vertical plate portion 21c, and the intermediate vertical plate portion in the spaces S1 and S2 of the hollow member 21. Since it is provided in the first space S1 partitioned by 21e, a load in the longitudinal direction of the vehicle from the carriage acts on the pillow beam during sudden acceleration / deceleration, and a large stress is generated in the intermediate vertical plate portion 21e. Even in this case, the stress is prevented from directly reaching the joint W2 between the pillow beam 13 and the middle beam 14 joined to the center of the pillow beam 13 in the vehicle width direction. Fatigue of the joint portion W2 can be suppressed. Therefore, in the underframe structure 10, sufficient strength can be ensured even when a large stress is generated in the pillow beam 13.

  In particular, the vehicle body 2 having the underframe structure 10 is a body of a locomotive in which a power unit is mounted, and since its mass increases, the traction force acting on the vehicle body 2 via the center pin 4 increases, A large inertial force also acts on the vehicle body 2. As a result, the vehicle longitudinal load acting on the pillow beam 13 increases, and the stress applied to the joint W2 between the pillow beam 13 and the intermediate beam 14 joined to the pillow beam 13 also increases. In such a vehicle body 2, the hollow member 21 of the pillow beam 13 has the intermediate vertical plate portion 21e, so that the strength of the pillow beam 13 is secured and the screw seat 6 is not the second space S2 but the first space S1. By connecting the intermediate beam 14 via the second member 32 to the intermediate vertical plate portion 21e where a large stress is generated, the stress reaches the joint W2 between the pillow beam 13 and the intermediate beam 14 directly. It is prevented.

  Specifically, the other end portion 14 b in the longitudinal direction of the middle beam 14 is joined to the outer vertical plate portion 21 d of the hollow member 21, so that it occurs in the pillow beam 13 with respect to the joined portion W <b> 2 and further to the middle beam 14. The applied stress is prevented from being directly applied, and fatigue of the joint W2 and the intermediate beam 14 can be suppressed. Therefore, in the underframe structure 10, the strength requirement of the middle beam 14 can be relaxed while ensuring the strength of the pillow beam 13.

  Further, since the joint portion W1 formed by welding the first member 31 and the second member 32 is disposed on the outer vertical plate portion 21d side with respect to the intermediate vertical plate portion 21e, a load in the longitudinal direction of the vehicle acts on the pillow beam 13. The first member 31 and the second member 32 can be joined at a position separated from the intermediate vertical plate portion 21e where a large stress is generated in some cases, and the stress generated in the joint portion W1 between the first member 31 and the second member 32 Can be reduced.

  The hollow member 21 has a cross-sectional shape having an upper plate portion 21a, a lower plate portion 21b, an inner vertical plate portion 21c, an outer vertical plate portion 21d, and an intermediate vertical plate portion 21e. When the hollow member 21 having such a cross-sectional shape is integrally formed by extrusion molding of a high-strength aluminum alloy, the aluminum alloy has low fluidity, and therefore a location where the molten metal does not sufficiently spread in the mold (for example, The part which shape | molds the intermediate | middle vertical board part 21e) will arise. As a result, the extrudability during molding deteriorates, the hollow member cannot be molded into a desired cross-sectional shape, and the strength of the hollow member after molding may not be ensured. In this embodiment, since the hollow member 21 is comprised by joining the 1st member 31 and the 2nd member 32 which were each extrusion-molded separately, the hollow member 21 is shape | molded in desired cross-sectional shape. In addition, the strength of the hollow member 21 can be ensured.

  Moreover, when processing the 1st member 31 and the 2nd member 32 by extrusion-molding an aluminum alloy so that it may become a desired cross-sectional shape, respectively, the board part which opposes among the board parts which comprise the said member 31 and 32 concerned By making the plate thickness uniform, it is possible to prevent twisting from occurring when extruding the aluminum alloy in the extrusion molding, thereby reducing the molding accuracy of the first member 31 and the second member 32.

  Here, since the center pin 4 is fixed to the lower plate portion 21b of the hollow member 21, the load acting on the lower plate portion 21b is large, and the plate thickness is preferably as large as possible in terms of strength. On the other hand, the load acting on the upper plate portion 21a is smaller than that on the lower plate portion 21b. In consideration of molding accuracy, when the plate thickness dimensions of the first upper plate portion 31a and the first lower plate portion 31b and the plate thickness sizes of the second upper plate portion 32a and the second lower plate portion 32b are equal, The plate thickness dimensions of the first upper plate portion 31a and the second upper plate portion 32a may be larger than necessary in terms of strength. Therefore, after welding the 1st member 31 and the 2nd member 32, the hollow member 21 is ensured, ensuring the intensity | strength of the lower board part 21b by cutting the 1st protrusion part 31c and the 2nd protrusion part 32c by cutting. Can be reduced in weight.

  Moreover, when each plate | board thickness dimension of the 1st upper board part 31a and the 2nd upper board part 32a is large, when welding the 1st member 31 and the 2nd member 32, an operator is the 1st protrusion part 31c and the 2nd protrusion. The welding is performed up to the upper surface of the portion 32c, so that the welding time becomes excessive and the amount of weld beads increases. As the amount of weld bead increases, thermal distortion may occur at the welded location, so it is desirable to limit the amount of weld bead to the minimum amount necessary.

  In the present embodiment, in the vicinity of the groove surfaces R11 and R21 of the first upper plate portion 31a and the second upper plate portion 32a, the upper portions are cut out so as to be thin, so the first member 31 and the first When the two members 32 are welded, a stepped portion is formed between the V-shaped groove and the upper surfaces of the projecting portions 31c and 32c in the vertical direction. Therefore, the operator performs welding by using the upper corner portion of the groove surfaces R11 and R21 as a mark, and uses the step portion formed in the vicinity of the groove as described above as a reference. It is possible to recognize the amount of weld bead necessary for welding between the first member 32 and the second member 32. Therefore, the welding time can be reduced and the weld bead amount can be limited as compared with the configuration in which the step portion is not formed in the vicinity of the groove.

  Further, when the pillow beam 13 is viewed from the longitudinal direction of the vehicle, the inverted L-shaped reinforcing member 25 that connects the connecting members 23 and 24 in the vertical direction is located outside the screw seat 6 (the bolt insertion hole 6b) in the vehicle width direction. It is arranged at a position shifted toward the direction. That is, the reinforcing member 25 is provided at a position that does not overlap the screw seat 6 when the pillow beam 13 is viewed from the vehicle longitudinal direction. When the reinforcement member is provided at a position overlapping the screw seat when the pillow beam to which the center pin is fixed is viewed from the longitudinal direction of the vehicle, the load acting on the pillow beam via the center pin is concentrated on the reinforcement member. And it turned out that big stress has generate | occur | produced in the periphery (especially connection part of a reinforcement member and a lower side connection member) of a reinforcement member among pillow beams.

  Therefore, by providing the reinforcing member 25 at a position that does not overlap the screw seat 6, the reinforcing member is provided at a position that overlaps with the screw seat even if a load in the vehicle longitudinal direction acts on the pillow beam 13 via the center pin 4. Compared to the configuration, the load can be dispersed and the stress generated in the pillow beam 13 can be reduced.

(Second Embodiment)
The railcar frame structure 210 according to the second embodiment is obtained by partially deforming the shapes of the first member 31 and the second member 32 constituting the hollow member 21 of the pillow beam 13 according to the first embodiment. . Below, the difference from 1st Embodiment is demonstrated about the 1st member 231 and the 2nd member 232 which comprise the hollow members 221 and 222 which concern on 2nd Embodiment.

  FIG. 5 is a view corresponding to FIG. 2 of the railcar frame structure 210 according to the second embodiment. In FIG. 5, the center pin 4 and the bolt 7 are not shown. As shown in FIG. 5, the first member 231 has a cross-sectional shape having an upper plate portion 221a, a lower plate portion 221b, an inner vertical plate portion 221c, and an intermediate vertical plate portion 221e. The second member 232 has a cross-sectional shape having only the outer vertical plate portion 221d.

  The upper plate portion 221a has a groove surface that forms a V-shaped groove at the end on the second member 232 side of the lower surface thereof when welding with the outer vertical plate portion 221d. The lower plate portion 21b also has a groove surface that forms a V-shaped groove at the end of the upper surface on the second member 232 side when welding with the outer vertical plate portion 221d. Further, groove surfaces that form a V-shaped groove when welded to the first member 231 are formed on both end surfaces in the vertical direction of the outer vertical plate portion 221d. The hollow member 221 is configured by welding the upper plate portion 221a of the first member 231 and the outer vertical plate portion 221d of the second member 232.

  Further, the other end portion 14b of the middle beam 14 in the vehicle longitudinal direction is joined to the upper plate portion 221a and the lower plate portion 221b of the first member 231. Specifically, the upper surface of the other end portion 14b in the vehicle longitudinal direction of the intermediate beam 14 and the upper surface of the upper plate portion 221a are welded, and the lower surface of the other end portion 14b and the lower surface of the lower plate portion 221b are welded. Yes. Other configurations are the same as those in the first embodiment.

  In the second embodiment, the same effect as that of the first embodiment can be obtained. Specifically, the hollow member 221 of the pillow beam 213 has an intermediate vertical plate portion 221e that connects the upper plate portion 221a and the lower plate portion 221b between the inner vertical plate portion 221c and the outer vertical plate portion 221d. Therefore, when a load in the vehicle longitudinal direction such as traction force is applied, the hollow member 221 can be prevented from being deformed into a substantially parallelogram shape, and the strength of the pillow beam 213 can be ensured. The screw seat 6 is a first space S1 defined by the upper plate portion 221a, the lower plate portion 221b, the inner vertical plate portion 221c, and the intermediate vertical plate portion 221e among the inner spaces S1 and S2 of the hollow member 221. Even if a large stress is generated in the intermediate vertical plate portion 221e due to the load in the longitudinal direction of the vehicle acting on the pillow beam 213, the pillow beam 213 and the pillow beam 213 are joined to approximately the center in the vehicle width direction. It is possible to prevent the stress from being directly applied to the joint portion W2 with the middle beam 14 and to suppress the fatigue of the joint portion W2 between the pillow beam 213 and the middle beam 14. Therefore, in the underframe structure 210, sufficient strength can be ensured even when a large stress is generated in the pillow beam 13.

(Third embodiment)
A railcar frame structure 310 according to the third embodiment is obtained by partially deforming the shape of the pillow beam 13 according to the first embodiment. Below, the different point from 1st Embodiment is demonstrated about the pillow beam 313 which concerns on 3rd Embodiment.

  FIG. 6 is a view corresponding to FIG. 2 of the railcar frame structure 310 according to the third embodiment. In FIG. 6, the center pin 4 and the bolt 7 are not shown. As shown in FIG. 6, the hollow member 321 is extruded so as to have a cross-sectional shape having an upper plate portion 321a, a lower plate portion 321b, an inner vertical plate portion 321c, an outer vertical plate portion 321d, and an intermediate vertical plate portion 321e. It is integrally formed by molding. Thus, the hollow member 321 according to the third embodiment is not a high-strength aluminum alloy with low fluidity but a shape formed by extrusion using another material with high fluidity. Other configurations are the same as those in the first embodiment.

  In the third embodiment, the same effect as that of the first embodiment can be obtained. Specifically, the hollow member 321 of the pillow beam 313 has an intermediate vertical plate portion 321e that connects the upper plate portion 321a and the lower plate portion 321b between the inner vertical plate portion 321c and the outer vertical plate portion 321d. Therefore, it is possible to prevent the hollow member 321 from being deformed into a substantially parallelogram shape when a load in the vehicle longitudinal direction such as traction force is applied, and to secure the strength of the pillow beam 313. In addition, the screw seat 6 that is screwed into the bolt 7 that fixes the center pin 4 includes the upper plate portion 321a, the lower plate portion 321b, the inner vertical plate portion 321c, and the intermediate vertical plate in the internal spaces S1 and S2 of the hollow member 321. Since it is provided in the first space S1 partitioned by the portion 321e, even when a large stress is generated in the intermediate vertical plate portion 321e due to a load in the vehicle longitudinal direction acting on the pillow beam 313, the pillow beam 313 and the pillow The stress is prevented from being directly applied to the joint W2 between the beam 313 and the middle beam 14 joined to the center in the vehicle width direction, and fatigue of the joint W2 between the pillow beam 313 and the middle beam 14 is also suppressed. be able to. Therefore, in the underframe structure 310, sufficient strength can be ensured even when a large stress is generated in the pillow beam 13.

  Further, in the third embodiment, the hollow member 321 is integrally formed by extrusion, so that the first member and the second member are compared with the configuration in which the hollow member is composed of the first member and the second member. Therefore, the number of work steps can be reduced.

  In each of the above embodiments, a locomotive equipped with a structure made of an aluminum alloy, in particular, has a greater force acting between the vehicle body and the carriage because the traction force, the braking force, and the like are larger than those of a power distribution type vehicle. In addition, the locomotive has a large vehicle weight and, as a result, a large load generated on the pillow beam. According to the configuration of each of the above embodiments, the strength of the pillow beam 13, 213, 313 is ensured. Since the strength requirement of the intermediate beam 14 can be relaxed, the effect when applied to a frame structure provided in the vehicle body of the locomotive (particularly, a locomotive including an aluminum alloy structure) is great.

  The railway vehicle 1 in the configuration of each embodiment is not limited to a locomotive, and may be applied to other vehicles that need to ensure the strength of pillow beams.

  In addition, this invention is not limited to each embodiment mentioned above, The structure can be changed, added, or deleted in the range which does not deviate from the meaning of this invention. The above embodiments may be arbitrarily combined with each other. For example, some configurations or methods in one embodiment may be applied to other embodiments. In addition, a part of the configuration in the embodiment can be arbitrarily extracted separately from the other configurations in the embodiment. In the above-described embodiment, only the middle beam 14 on the vehicle end side is joined to the pillow beams 13, 213, 313. However, the present invention is not limited to this configuration, and the hollow members 22, 222 of the pillow beams 13, 213, 313 are used. , 322 may be further joined with a center beam extending in the vehicle width direction on the vehicle body center side.

3 Cart 4 Center pin 5 Base frame 6 Bolt 7 Screw seat 10, 210, 310 Base frame structure 13, 213, 313 Pillow beam 14 Middle beam 14b Vehicle longitudinal direction other end (vehicle longitudinal direction end)
21, 22, 221, 222, 321 Hollow member 21a, 221a, 321a Upper plate portion 21b, 221b, 321b Lower plate portion 21c, 221c, 321c Inner vertical plate portion 21d, 221d, 321d Outer vertical plate portion 21e, 221e, 321e Intermediate vertical plate portion 23, 24 Connecting member 31, 231 First member 32, 232 Second member R11, R21 End face (groove surface)
S1 1st space (internal space)
W1 joint

Claims (6)

A frame having a pillow beam extending in the vehicle width direction, and a middle beam that is joined to a substantially center of the pillow beam in the vehicle width direction and extends in the vehicle longitudinal direction,
A screw seat provided on the pillow beam and screwed to a bolt for fixing a center pin to the pillow beam; and
The pillow beam has a pair of hollow members that are arranged at intervals in the vehicle longitudinal direction and whose internal space extends in the vehicle width direction, and a connecting member that connects the pair of hollow members to each other,
Each of the pair of hollow members is
An upper plate,
A lower plate portion spaced downward from the upper plate portion;
An inner vertical plate portion that connects one end portions of the upper plate portion and the lower plate portion, and
An outer longitudinal plate portion connecting the other end portions of the upper plate portion and the lower plate portion to each other;
An intermediate vertical plate portion disposed between the inner vertical plate portion and the outer vertical plate portion and connecting the upper plate portion and the lower plate portion to each other;
The screw seat is a railcar frame structure provided in a space defined by the upper plate portion, the lower plate portion, the inner vertical plate portion, and the intermediate vertical plate portion in the internal space.   The railcar frame structure according to claim 1, wherein an end portion of the hollow beam in the vehicle longitudinal direction is joined to an end portion of the hollow member on the outer vertical plate portion side of the pair of hollow members. The hollow member includes a first member and a second member joined to the first member,
3. The railcar frame structure according to claim 1, wherein a joint between the first member and the second member is disposed closer to the outer vertical plate than the intermediate vertical plate. The first member is
A first upper plate portion constituting a part of the upper plate portion, a first lower plate portion constituting a part of the lower plate portion, and one end portions of the first upper plate portion and the first lower plate portion. Including an inner vertical plate portion that connects the other ends of the first upper plate portion and the first lower plate portion to each other, and has a substantially quadrangular cross section. And
The second member is
A second upper plate part constituting another part of the upper plate part, a second lower plate part constituting another part of the lower plate part, the second upper plate part and the second lower plate The cross section has a substantially horseshoe shape by including the outer vertical plate portion connecting the end portions on the opposite side of the first member among the portions,
The railcar frame according to claim 3, wherein the first member and the second member are joined at a position between the intermediate vertical plate portion and the outer vertical plate portion in the longitudinal direction of the vehicle. Construction.   In the first member, the plate thickness dimensions of the first upper plate portion and the first lower plate portion are substantially the same, or the plate thickness sizes of the inner vertical plate portion and the intermediate vertical plate portion are substantially the same. The railcar frame structure according to claim 4. The mutually opposing end surfaces of the first upper plate portion and the second upper plate portion are groove surfaces inclined with respect to a vertical plane,
The railcar frame structure according to claim 4 or 5, wherein an upper portion is cut out in the vicinity of each end face of the first upper plate portion and the second upper plate portion so as to be thin.

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