JP2023022552A - Railway vehicle cap beam structure and railway vehicle - Google Patents

Abstract

To provide a railway vehicle cap beam structure which extends a light weightiness and a high rigidity, while contributing to improvement of a vehicle body assembly and securing a prescribed space between the cap beam and an underframe, and to provide a railway vehicle with the cap beam structure.SOLUTION: A cap beam structure of a cap beam installed on an underframe constituting a floor of a railway vehicle body structure is formed by bonding plural shaped materials of multilayer structures whose extrusion direction is a width direction of the body structure. The plural shaped materials include a first shaped material which has an upper projecting part to project upward and has a region lacking a part of the upper projecting part layer in a central part in a width direction of the body structure and include a second shaped material which has not the upper projecting part and comprise a fastening component installed on the shaped material of the second shaped material of the cap beam at both end parts in the width direction of the body structure and couple the cap beam on the side beam via the fastening face of the fastening component.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a railway vehicle bolster structure and a railway vehicle, and more particularly to a railway vehicle bolster structure and a railway vehicle having an underframe structure.

In general, a vehicle structure (hereinafter referred to as the structure) includes an underframe forming a floor surface, side structures arranged at both ends in the width direction of the underframe, and ends arranged at both ends in the longitudinal direction of the underframe. It is a hexahedral structure composed of a structure, a side structure, and a roof structure arranged above the end structure.

The underframe includes side beams provided along the longitudinal direction at both ends in the width direction of the underframe, end beams connecting the both ends in the longitudinal direction of the side beams, and a predetermined distance from the ends in the longitudinal direction of the structure. and center beams arranged along the longitudinal direction of the structure for connecting the end beams and the bolsters to the structure.

A center pin provided along the vertical direction of the structure on the lower surface of the bolster is connected to the bogie frame that constitutes the bogie. During acceleration and deceleration of the vehicle, a load in the longitudinal direction of the vehicle is transmitted from the bogie to the bolster via the center pin.

On the other hand, from the viewpoint of improving the assemblability of railway vehicles, it is required to facilitate the installation of wiring and ducts installed under the floor. In order to facilitate the installation, it is effective to provide a certain space between the underframe and the bolster in a state where the bolster is attached to the bogie, and assemble it to the structure. As a bogie structure having such a bolster mounted, Patent Documents 1 and 2 propose a carriage provided with bolsters that are bolted only to the side beams.

EP-A-2500231 EP-A-2540592

In the underframe structure of a railway vehicle, in the case of a structure in which the bolster is connected only to the side beam, the bolster undergoes torsional deformation due to the moment load transmitted from the bogie to the bolster via the center pin. In addition, bending deformation occurs in the bolster due to the vertical load transmitted from the bogie through the air spring due to the vertical vibration during running.

In the bogie structures provided with the bolsters described in Patent Documents 1 and 2, the bolster structures are composed of ribs and face plates with uniform cross sections along the width direction of the vehicle structure. With this configuration, the weight of the bolster is likely to increase, and the size of the space between the bolster and the underframe may be restricted. In addition, the cost is high because the structure is composed of dedicated ribs and a face plate.

In view of the above problems, the present invention provides a bolster structure for a railway vehicle that is lightweight and highly rigid while ensuring a predetermined space between the bolster and the underframe, and contributes to improving the assemblability of the vehicle body, and such a bolster. An object of the present invention is to provide a railway vehicle with a beam structure.

In order to achieve the above object, one of the representative railway vehicle bolster structures of the present invention is a bolster structure of a bolster provided in an underframe constituting a floor of a railway vehicle body structure, wherein the bolster The beam is formed by joining a plurality of multi-layered structural members whose extrusion direction is the width direction of the structure. and a second shape member having no upper protrusion portion, and a second shape member having no upper protrusion portion at both ends in the width direction of the structure. A fastening member is provided on the second shape member of the bolster, and the bolster is fastened to the side beam via a fastening surface of the fastening member.

INDUSTRIAL APPLICABILITY According to the present invention, in a railway vehicle bolster structure and a railway vehicle, a bolster structure that is lightweight and highly rigid while ensuring a predetermined space between a bolster and an underframe while contributing to an improvement in assemblability of a vehicle body. can do.
Problems, configurations, and effects other than those described above will be clarified by the following embodiments.

FIG. 1 is a side view of a railway vehicle according to Embodiment 1 of the present invention. FIG. 2 is a bottom perspective view of the vehicle structure of Example 1 of the present invention. FIG. 3 is a perspective view showing the appearance of the top side of the bolster of Example 1 of the present invention. FIG. 4 is a perspective view showing the appearance of the underside of the bolster of Example 1 of the present invention. FIG. 5 is a cut-away enlarged perspective view showing the joining of the bolster profiles of Example 1 of the present invention. FIG. 6 is a diagram showing a cross section along line AA of FIG. FIG. 7 is a perspective view of a shape member before processing used in the bolster of Example 1 of the present invention. FIG. 8 is a cross-sectional view cut along a plane perpendicular to the longitudinal direction of an unprocessed shaped member used for the bolster of Example 1 of the present invention. FIG. 9 is a diagram for explaining the connection state of the shape members used in the bolster of Example 1 of the present invention. FIG. 10 is a view showing the connection state of the shape members used in the bolster of Example 1 of the present invention, including the fastening member and the anti-slip member. FIG. 11 is a perspective view showing a state before each shape member of the body bolster of Example 1 of the present invention is joined. FIG. 12 is a cut enlarged perspective view showing the configuration of the bolster of Example 2 of the present invention. FIG. 13 is a cross-sectional view cut along a plane perpendicular to the longitudinal direction of the shape before processing used in the bolster of Example 3 of the present invention.

A mode for carrying out the present invention will be described.

A mode for carrying out the present invention will be described with reference to FIGS. 1 to 13. FIG. First, each direction in each figure is defined. The traveling direction or longitudinal direction (front-rear direction) of the railway vehicle provided with the body structure 1 is the X direction, the width direction (horizontal direction) of the railway vehicle provided with the body structure 1 is the Y direction, and the height direction (vertical direction) of the railway vehicle provided with the body structure 1 ) is the Z direction. Hereinafter, these directions may be simply referred to as the X direction, the Y direction, and the Z direction.

<Example 1>
FIG. 1 is a side view of a railway vehicle according to Embodiment 1 of the present invention. FIG. 2 is a bottom side perspective view of the vehicle structure of Embodiment 1 of the present invention.

A railway vehicle 100 includes a body structure 1 and a bogie 2 that supports the body structure 1 below the body structure 1 .

The structure 1 includes an underframe 10 forming a floor surface, side structures 30 arranged at both ends in the width direction of the underframe 10, end structures 40 arranged at both ends in the longitudinal direction of the underframe, and side structures. It is a hexahedral structure composed of 30 and a roof structure 50 arranged above the end structure 40 .

The underframe 10 includes a floor structure 5 , side beams 11 , end beams 12 and bolsters 13 . The floor structure 5 forms the floor surface of the railway vehicle 100 . The side beams 11 are provided along the longitudinal direction (X direction) at both ends of the underframe 10 in the width direction (Y direction). The end beams 12 connect both ends of the side beams 11 in the longitudinal direction (X direction). The bolster 13 is provided along the width direction (Y direction) of the underframe 10 at a predetermined distance from the end of the body structure 1 in the longitudinal direction (X direction).

The carriage 2 is provided on the lower side of the bolster 13, and is provided so as to be capable of turning with respect to the underframe 10 around a center pin 14 along the Z direction in the horizontal plane. The bogie 2 includes a bogie frame 3 and wheels 6 fixed to both ends of an axle rotatably held on the bogie frame 3 . The truck 2 supports an underframe 10 via air springs 4 provided on both sides in the Y direction near the center in the X direction.

A center pin 14 provided along the vertical direction of the structure 1 on the lower surface of the bolster 13 is connected to the bogie frame 3 . During acceleration and deceleration of the vehicle, a load in the longitudinal direction of the vehicle is transmitted from the bogie 2 to the bolster 13 via the center pin 14 .

FIG. 3 is a perspective view showing the appearance of the top side of the bolster of Example 1 of the present invention. The bolster 13 has a structure formed by arranging and joining four shape members 15A, 15B, 15C, and 15D in the X direction. These profiles are extruded profiles and have a hollow inside. The extrusion direction is the Y direction. Furthermore, the bolster 13 has a fastening member 22 and an anti-slip member 23 .

The shape members 15B and 15C in the center in the X direction form an upper protruding portion 25 along the Y direction that protrudes above the upper surfaces of the shape members 15A and 15D at both ends. The cross-sectional shape of the upper projecting portion 25 on the cross-sectional plane on the XZ plane is a trapezoidal shape with a short side on the upper side. A central notch portion 26 is formed by notching a part of the upper protruding portion 25 downward in the central portion of the upper protruding portion 25 in the Y direction. The top surface of the notched portion is formed lower than the top surface of the upper protruding portion 25 via the step 21, and has a height equal to or close to the top surfaces of the shape members 15A and 15D at both ends. The shape members 15A and 15D at both ends are not provided with protrusions such as the upper protrusion 25. As shown in FIG. Both ends of the shape members 15A and 15D in the X direction have side cutouts 27 formed by cutting out portions other than both ends in the Y direction of the entire side surface, particularly the central portion in the Y direction.

The fastening members 22 are arranged at both ends of the bolster 13 in the Y direction and fixed by joining or the like. Specifically, in each of the shape member 15A and the shape member 15D, it is arranged on the upper surface of each of the Y-direction end portions of the shape member 15A and the shape member 15D. The cross-sectional shape of the fastening member 22 on the XZ plane is an upside-down trapezoidal shape, with the longer side positioned on the upper side. Therefore, the fastening member 22 is arranged in a nested cross-sectional shape with respect to the cross-sectional shape on the XZ plane of the upper protrusions 25 of the shape members 15A and 15D. The position of the upper surface of the fastening member 22 in the Z direction is substantially the same as the position of the upper surface of the upper projecting portion 25 of the shape member 15B and the shape member 15C. Further, thin plate portions 22a are provided at both ends of the upper surface of the fastening member 22 in the X direction. The X-direction end of the thin plate portion 22a is connected to the X-direction outer end of the upper surface of the upper projecting portion 25 of the shape member 15A and the shape member 15D by joining or the like. As a result, the side surface of the fastening member 22 in the X direction is fixed to the upper projecting portion 25 via the thin plate portion 22a on the upper surface. Here, a member capable of being elastically deformed to some extent can be applied to the thin plate portion 22a.

By providing the fastening member 22, a fastening surface with the bolster 13 is configured on the upper surface side. The bolster 13 is fixed to the side sill 11 by bolts or the like via this fastening surface. Further, by providing the thin plate portion 22a at the end portion of the fastening member 22, it is possible to reduce stress concentration occurring in the side beam 11 in the vicinity of the end portion of the fastening member 22. FIG.

The anti-slip members 23 are arranged in the center of the X direction on both ends of the bolster 13 in the Y direction and fixed by joining or the like. Specifically, it is provided so as to connect the upper surfaces of the upper projections 25 of the shape member 15B and the shape member 15C at the upper surface positions in the Z direction. This makes it possible to increase the number of fastening surfaces. The upper surface of the anti-slip member 23 is preferably made of a material having a higher coefficient of friction than other portions (for example, the upper surface of the upper projecting portion 25 and the fastening surface of the fastening member 22). The width of the anti-slip member 23 in the Y direction is provided by a predetermined width suitable for anti-slip from the Y-direction end portions of the shape member 15B and the shape member 15C. For example, the fastening member 22 may have substantially the same width in the Y direction. When the bolster 13 is fixed to the side sill 11, the anti-slip member 23 increases the friction of the fastening surface. can be reduced.

FIG. 4 is a perspective view showing the appearance of the underside of the bolster of Example 1 of the present invention. FIG. 4 is a diagram of a state in which the top and bottom of FIG. 3 are turned upside down.

The shape members 15B and 15C at the center in the X direction have receiving portions 28 on both sides in the Y direction on the lower surface side. The receiving portion 28 is formed by notching upward in a predetermined range from both ends in the Y direction. In the Y direction, the notch of the receiving portion 28 does not overlap with the central notch portion 26 to maintain strength. The receiving portion 28 can receive the air spring 4, and the thickness in the Z direction can be reduced by the amount of the notch.

FIG. 5 is a cut-away enlarged perspective view showing the joining of the bolster profiles of Example 1 of the present invention. FIG. 5 shows a view cut along the XZ plane at the central portion in the longitudinal direction (Y direction) of the bolster 13 for explanation.

The shape member 15A and the shape member 15B, the shape member 15B and the shape member 15C, and the shape member 15C and the shape member 15D are joined at the welded portion 16, respectively. These joints are welded along the Y direction by butting the face plates of the respective shapes against each other.

FIG. 6 is a diagram showing a cross section along line AA of FIG. As shown in FIG. 6 , the bolster 13 is installed between the truck 2 and the underframe 10 .

A space 24 is a space provided between the floor structure 5 and the bolster 13 . By forming the above-described central notch 26 in the bolster 13, the space 24 can be widened. This space 24 can be utilized as a space for arranging various members and parts such as pipes, ducts, sensors, and anti-vibration materials. Further, by adjusting the size of the step 21 while considering the balance with the strength, it is possible to make the space 24 of various sizes.

The fastening member 22 of the bolster 13 is a portion for fixing the side beam 11 to the bolster 13 with a bolt or the like. The fastening members 22 are positioned near both ends of the structure 1 in the Y direction, and are fixed to the side beams 11 on both ends in the Y direction. The receiving portion 28 of the bolster 13 receives the upper side of the air spring 4 of the bogie 2 .

Here, a vertical load is transmitted from the truck 2 to the bolster 13 via the air spring 4 . At this time, bending stress is applied to the bolster 13 between the side beam 11 and the air spring 4, causing bending deformation, but the bending rigidity of the shape members 15A to 15D can reduce this. Furthermore, a moment load is transmitted from the bogie 2 to the bolster 13 via the center pin 14, causing torsional deformation.

FIG. 7 is a perspective view of a shape member before processing used in the bolster of Example 1 of the present invention. FIG. 8 is a cross-sectional view cut along a plane perpendicular to the longitudinal direction of an unprocessed shaped member used for the bolster of Example 1 of the present invention.

The shape members 15A, 15B, 15C, and 15D described above can use the shape member 15 having the same cross-sectional shape before processing such as machining. The shape member 15 is formed while maintaining the cross-sectional shape shown in FIG. 8 with the Y direction as the longitudinal direction. For the shape member 15, a multi-layered aluminum shape member extruded along the width direction (Y direction) of the structure 1 is applied.

As shown in FIG. 8, the shaped member 15 has a three-layer structure in which three face plates, a first face plate 15a, a second face plate 15b, and a third face plate 15c, are arranged in parallel in the Z direction from the top. The second face plate 15b and the third face plate 15c have the same length in the X direction, and the first face plate 15a has a shorter length in the X direction than the second face plate 15b and the third face plate 15c. Also, the distance in the Z direction between the first face plate 15a and the second face plate 15b is larger than the distance between the second face plate 15b and the third face plate 15c.

The first face plate 15a and the second face plate 15b are connected by outer ribs 15d on both sides in the X direction and two inner ribs 15e on the inner side in the X direction. The outer ribs 15d and the inner ribs 15e are inclined in a direction in which the X-direction outer side narrows from the second face plate 15b to the first face plate 15a. As a result, the section between the first face plate 15a and the second face plate 15b has a trapezoidal shape as a whole. If the cross section is trapezoidal, it can be easily processed by machining or the like.

The second face plate 15b and the third face plate 15c are connected by an outer rib 15f on both sides in the X direction and two inner ribs 15g on the inner side in the X direction. The outer rib 15f and the inner rib 15g are formed perpendicular to the second face plate 15b and the third face plate 15c. As a result, the section between the second face plate 15b and the third face plate 15c has a rectangular shape as a whole.

FIG. 9 is a diagram for explaining the connection state of the shape members used in the bolster of Example 1 of the present invention.

As shown in FIG. 9, the bolster 13 can be formed by processing and joining the shape members 15 having the same cross-sectional shape. The shape members 15A and 15D are connected to the shape members 15B and 15C by turning the shape member 15 upside down. The shapes 15B and 15C are made to protrude above the connection range P, and the shapes 15A and 15D that protrude below the connection range P are removed. That is, it is formed by notching the first face plate 15a, the outer rib 15d, and the inner rib 15e of the shape member 15 corresponding to the shape members 15A and 15D.

The upper protruding portions 25 of the shape members 15B and 15C described with reference to FIG. On the other hand, the central cutout portion 26 is formed by cutting out the first face plate 15a, the outer rib 15d, and the inner rib 15e of the shape member 15 corresponding to the shape members 15B and 15C.

The receiving portion 28 described in FIG. 4 is formed by notching the third face plate 15c, the outer rib 15f, and the inner rib 15g of the shape member 15 corresponding to the shape members 15B and 15C. The outer ribs 15f of the shape members 15B and 15C located on the side of the shape members 15A and 15D may be left without notching to increase the strength.

The side notch portion 27 described in FIG. 3 is formed by cutting out the shape member 15 corresponding to the shape members 15A and 15D. In the central portion in the Y direction, portions other than the outer rib 15f on the connection side with the shape members 15B and 15C and the portions of the second face plate 15b and the third face plate 15c close thereto are cut out.

The third face plate 15c and the second face plate 15b of the shape member 15A are joined to the second face plate 15b and the third face plate 15c of the shape member 15B, respectively. The second face plate 15b and the third face plate 15c of the shape member 15B are joined to the second face plate 15b and the third face plate 15c of the shape member 15C, respectively. The second face plate 15b and the third face plate 15c of the shape member 15C are joined to the third face plate 15c and the second face plate 15b of the shape member 15D, respectively.

FIG. 10 is a view showing the connection state of the shape members used in the bolster of Example 1 of the present invention, including the fastening member and the anti-slip member.

The fastening member 22 is arranged and fixed on the third face plate 15c, which is the upper surface, of the shape member 15A and the shape member 15D. At this time, the upper surface of the fastening member 22 is approximately the same height as the first face plate 15a, which is the upper surface of the shape member 15B and the shape member 15C. The thin plate portions 22a extending from the upper surface of the fastening member 22 to both ends in the X direction are connected to the ends (on the side of the shape 15A and the shape 15D) of the first face plates 15a of the shape members 15B and 15C.

The anti-slip member 23 is provided so as to connect the upper surfaces of the shape member 15B and the shape member 15C. The anti-slip member 23 is connected to the ends (on the side of the shape 15C and on the side of the shape 15B) of the first face plates 15a of the shape 15B and the shape 15C, respectively.

FIG. 11 is a perspective view showing a state before each shape member is connected in the body bolster of Example 1 of the present invention. The profiles 15A, 15B, 15C and 15D are machined from the profile 15 shown in FIGS. The longitudinal directions of the shape members 15A, 15B, 15C, and 15D are all the same Y direction.

The shape member 15B and the shape member 15C can be processed into the same shape as the first shape member. A cutting process or the like is performed so as to form the central cutout portion 26 and the receiving portion 28 described above. The shape member 15A and the shape member 15D, which are processed into the same shape as the second shape member, can be used by symmetrically arranging them.

Then, the shape members 15A, 15B, 15C, and 15D after processing are arranged in the X direction with the Y direction aligned at the same position and joined. Further, the fastening member 22 and the anti-slip member 23 described above can also be joined at the same time as or after joining the shape members 15A, 15B, 15C, and 15D.

(effect)
As described above, the bolster 13 can be a lightweight and rigid bolster 13 by using the extruded shape member 15 . In particular, as an aluminum shape, it is possible to reduce weight and secure rigidity. Further, since the shape member 15 is a multi-layered shape member 15, the rigidity can be improved. By processing the shape member 15, a space 24 can be secured between the floor structure 5 and the bolster 13, and various members and parts such as pipes, ducts, sensors, and anti-vibration materials can be arranged. It becomes possible. At this time, the size of the space 24 can be adjusted by adjusting the size of the step 21 .

The bolster 13 can be formed by processing the shape members 15 having the same cross-sectional shape, and combining and joining them to reduce the cost and make the bolster 13 lightweight and rigid. At that time, by devising how to combine the shape members 15, it becomes possible to maintain high functions of the bolster 13, such as securing rigidity and securing space. By sharing the shape member 15 with the shape member used in other parts of the structure 1 of the railroad vehicle 100, the number of parts can be reduced and the cost of the vehicle can be reduced.

By using the fastening member 22, the bolster 13 can be fixed to the side beam 11 reliably by aligning the height of the fixing surface. At this time, by providing the thin plate portion 22a in the fastening member 22, stress concentration can be reduced and the reliability of the fastening portion can be improved. Furthermore, by arranging the anti-slip member 23 at the height of the fixed surface, it is possible to prevent the occurrence of slippage on the bolt fastening surface between the bolster 13 and the side beam 11 .

In addition, the shape members 15 of the body bolster 13 secure a predetermined connection range P (FIG. 10) and are joined with a plurality of face plates, thereby enabling reliable joining of the shape members 15 to each other. It is possible to increase the strength of In addition, by providing the receiving portion 28, the vertical height of the air spring 4 can be ensured without increasing the position of the underframe 10. As shown in FIG.

<Example 2>
FIG. 12 is a cut enlarged perspective view showing the configuration of the bolster of Example 2 of the present invention. FIG. 12 shows a view cut along the XZ plane at the central portion in the longitudinal direction (Y direction) of the bolster 13' for explanation. In the second embodiment, points different from the first embodiment will be mainly described, and the same reference numerals will be given to the same portions, and the same descriptions will be omitted for portions that have no particular description.

The bolster 13' of the second embodiment has a configuration in which a reinforcement 17 is added to the bolster 13 of the first embodiment. The reinforcement 17 is a plate-shaped member that is reinforced by joining to the upper surface of the shaped member 15 . For example, it is provided along the Y direction between the ribs 18 (remaining portions after cutting the outer ribs 15d and the inner ribs 15e) on the upper surfaces of the central cutouts 26 of the shape members 15B and 15C. At this time, the reinforcement 17 is reinforced by the length of the center notch 26 in the Y direction or longer.

In addition to the effect of the first embodiment, the second embodiment can increase the bending rigidity of the bolster 13' by using the reinforcement 17 and reduce the bending deformation of the bolster 13' when receiving a bending moment. It becomes possible. In particular, by reinforcing the vicinity of the central cutout portion 26 where the thickness is thin, the bending rigidity can be effectively increased.

<Example 3>
FIG. 13 is a cross-sectional view cut along a plane perpendicular to the longitudinal direction of the shape before processing used in the bolster of Example 3 of the present invention. In the third embodiment, points different from the first embodiment will be mainly described, and the same reference numerals will be given to the same portions, and the same descriptions will be omitted for portions that have no particular description.

In Example 3, the shape member 15 ′ has a five-layer structure in which two face plates (two layers) are added to the lower side of the shape member 15 of Example 1. Specifically, below the third face plate 15c, a fourth face plate 15h and a fifth face plate 15i that are parallel to and of the same size as the third face plate 15c are added. An outer rib 15j and an inner rib 15k are connected between the third face plate 15c and the fourth face plate 15h. An outer rib 15m and an inner rib 15n are connected between the fourth face plate 15h and the fifth face plate 15i. These ribs have the same shape as the outer rib 15f and the inner rib 15g. The second face plate 15b, the third face plate 15c, the fourth face plate 15h, and the fifth face plate 15i have the same spacing in the z direction.

When connecting the shape member 15' shown in FIG. 13 according to the first embodiment shown in FIGS. can be used to form bolsters. That is, the shape members 15A, 15B, 15C, and 15D are respectively connected by four face plates. In this case, the shape members 15A and 15D can be applied with their vertical directions reversed. Therefore, the length of the connection range P in the Z direction can be increased.

In the third embodiment, in addition to the effects of the first embodiment, the length of the connection range P in the Z direction can be made longer than the first embodiment, and the number of faceplates to be connected can be increased. This increases the flexural rigidity and torsional rigidity of the shape member 15', making it possible to reduce the flexural deformation and torsional deformation of the bolster when subjected to a bending moment and a torsional moment.

In addition, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, the above-described embodiments have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. In addition, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. Moreover, it is possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.

For example, it is possible to attach a member that receives a load from a yaw damper attached to the bogie 2 to the bolster 13, 13'.

Moreover, the shape members 15A and 15D of the first embodiment do not use the same shape members as the shape members 15C and 15D, but originally use a double-structured shape member having the second face plate 15b and the third face plate 15c. good too. In this profile, the first face plate 15a, the outer ribs 15d and the inner ribs 15e are absent. Similarly in the third embodiment, the sections 15A and 15D may be quadruple-structure sections originally having the second face plate 15b, the third face plate 15c, the fourth face plate 15h, and the fifth face plate 15i.

In addition, four examples were shown for the number of shape members used for the bolster. The number of profile members can be changed, for example, to two or more, three or more, or four or more in consideration of the shape of the profile members or the bolsters.

In addition, the number of face plates to which each shaped member is joined is two in the first embodiment and four in the third embodiment. However, the number of face plates to be joined is not limited to this, and the rigidity can be increased by increasing the number, for example, two or more, three or more, or four or more.

DESCRIPTION OF SYMBOLS 1... Structure, 2... Bogie, 3... Bogie frame, 4... Air spring, 5... Floor structure, 6... Wheel, 10... Underframe, 11... Side beam, 12... End beam, 13, 13'... Body bolster, 14... Center pin, 15, 15', 15A, 15B, 15C, 15D... Shape member 15a... First face plate 15b... Second face plate 15c... Third face plate 15d... Outer rib 15e... Inner rib 15f Outer rib 15g Inner rib 15h Fourth face plate 15i Fifth face plate 15j Outer rib 15k Inner rib 15m Outer rib 15n Inner rib 16 Welded portion 17 Reinforcement 18... Rib 21... Step 22... Fastening member 22a... Thin plate part 23... Anti-slip member 24... Space 25... Upper projecting part 26... Central notch part 27... Side notch part 28... Receiving part, 30... Side structure, 40... End structure, 50... Roof structure, 100... Railway vehicle, P... Connection range

Claims (9)

A bolster structure of a bolster provided in an underframe constituting a floor of a railroad car body,
The body bolster is formed by joining a plurality of multi-layered structural members whose extrusion direction is the width direction of the structure,
The plurality of shape members include a first shape member having an upper protruding portion that protrudes upward and having a region obtained by cutting out a part of the layer of the upper protruding portion at the center in the width direction of the structure; a second profile having no portion;
a fastening member disposed on the second shape member of the bolster at both ends in the width direction of the structure;
A bolster structure for a railway vehicle, wherein the bolster is fastened to a side beam via a fastening surface of the fastening member. In the bolster structure according to claim 1,
A bolster structure for a railway vehicle, wherein the upper surface of the upper projecting portion and the upper surface of the fastening member are positioned substantially at the same height direction. In the bolster structure according to claim 1 or claim 2,
A head beam structure for a railway vehicle, wherein the second shape member is arranged on both side surfaces in the front-rear direction, and cuts out a part of the side surface in the center of the body structure in the width direction. In the bolster structure according to any one of claims 1 to 3,
A bolster structure for a railway vehicle, wherein a thin plate portion is provided at an end portion of the fastening member. In the bolster structure according to any one of claims 1 to 4,
A bolster for a railway vehicle, wherein the bolster is provided with a plate-shaped member at both ends in the width direction of the body structure and at the center in the front-rear direction for preventing or reducing the occurrence of slippage when the bolster is fastened. structure. In the bolster structure according to any one of claims 1 to 5,
A bolster structure for a railway vehicle, wherein a reinforcement is provided on the upper surface of the shaped member. In the bolster structure according to any one of claims 1 to 6,
A bolster structure for a railway vehicle, wherein the upper projecting portion has a substantially trapezoidal cross section. In the bolster structure according to any one of claims 1 to 7,
A bolster structure for a railroad vehicle, wherein the shape member is formed by machining a shape member having the same cross-sectional shape as a shape member forming the structure of the railroad vehicle. A railway vehicle having an underframe structure comprising the bolster structure according to any one of claims 1 to 8, wherein the underframe structure constitutes a floor.

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