JP2019199111A - undercover - Google Patents

Abstract

To provide an undercover which is reduced in weigh.SOLUTION: An undercover 10 installed on a railway truck and made of hollow resin plates is composed of plural split plates 11, 12 arranged in parallel. Two of the plural split plates 11, 12 have same shapes and same scales and are arranged in point symmetry around a center point of the truck in the state that the undercover is installed on the truck.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a railroad undercover. Specifically, the present invention relates to an undercover that is attached to a bogie of a railway vehicle.

  The railcar bogie supports the vehicle body via an air spring on the bogie frame, and transmits the propulsive force due to the rotation of the wheels and the braking force during braking to the vehicle body, thereby causing the vehicle to travel stably along the rail. be able to. Various devices such as a brake device, a main motor, a gear device, a yaw damper, and a wheel shaft are attached to the bogie frame of such a bogie, and the lower portion thereof has an uneven shape due to the various devices attached. Therefore, in the lower part of the carriage, the air flow is disturbed when the vehicle travels, and eddy currents are likely to occur, causing noise inside and outside the vehicle. Further, when the vehicle travels, the ballast spread under the rail may be wound up, causing damage to the surfaces of various devices under the carriage. Patent Document 1 describes that an under cover is attached to cover and smooth the lower part of the carriage in order to suppress such noise and to suppress damage due to ballast.

JP-A-7-125635

  The under cover described in Patent Document 1 is formed of a steel plate so as to have sufficient strength for suppressing damage caused by the rolled up ballast. However, since the railway vehicle itself is large, the under cover attached to the lower part of the carriage must be enlarged. Therefore, the metal under cover has a problem that its overall weight increases.

  The present invention has been made to solve such a conventional problem, and an object thereof is to provide a lighter under cover.

In order to solve the above-described problems, the under cover of the present invention is made of a resin-made hollow plate material attached to a railway carriage, and is configured by arranging a plurality of divided plate materials in parallel.
According to said structure, since an undercover consists of resin-made hollow plate materials, it is lightweight compared with a metal thing. Further, since the under cover is divided into a plurality of divided plate materials, the size of one divided plate material can be reduced and the weight can be reduced.

  In the above invention, two of the plurality of divided plate members have the same shape and the same size, and are arranged in point symmetry with respect to the center point of the carriage when attached to the carriage. It is preferable.

  In the above invention, each of the divided plate members is divided into a first divided plate member and a second divided plate member that are at least one of different shapes and different sizes, and each of the first divided plate members is formed at a central point of the carriage. It is preferable that the second divided plate members are arranged point-symmetrically with respect to the center point of the carriage.

  In the above invention, in the state of being attached to the carriage, a part of the front end part protrudes forward, a part of the rear end part protrudes rearward, and the whole of the front end part and the rear end part It is preferable that all are curved upward.

  According to the present invention, a lighter undercover can be obtained.

(A) is a model top view of a trolley | bogie, (b) is a model side view of a trolley | bogie. (A) is a model top view of the trolley | bogie which shows the state in which the under cover of this embodiment was attached, (b) is a model side view of the trolley | bogie which shows the state in which the under cover of this embodiment was attached. The figure explaining an undercover. The perspective view of the 1st division board material which constitutes an undercover. The perspective view of the 2nd division board material which constitutes an undercover. The figure which combined the 1st division board material and the 2nd division board material. (A) is a perspective view of a core layer, (b) is a cross-sectional view taken along line α-α in (a), and (c) is a cross-sectional view taken along line β-β in (a). (A) is a perspective view of the sheet material which comprises a core layer, (b) is a perspective view which shows the state in the middle of folding of the same sheet material, (c) is a perspective view which shows the state which folded the same sheet material. The perspective view of a fastening member. Sectional drawing of the state to which the fastening member was attached. The figure explaining the supporting member of a fastening member. The figure explaining the method of attaching a fastening member to an under cover. The figure explaining the method of attaching an undercover to a trolley | bogie. (A) is a perspective view of the example of a change of a fastening member, (b) is sectional drawing of the state in which the example of a change of a fastening member was attached. The figure explaining the support member of the example of a change of a fastening member. The figure explaining the example of a change of an undercover. The figure explaining the example of a change of the method of attaching an undercover to a trolley | bogie.

The under cover of this embodiment consists of a hollow plate material made of thermoplastic resin, and is attached to the lower part of the bogie of the railway vehicle.
As shown in FIGS. 1 (a) and 1 (b), the bogie has a brake frame 2, a main motor 3, a gear device 4, a yaw damper 5, an air spring 7 and the like attached to the bogie frame 1, and the air spring 7 The upper vehicle body T is supported via A wheel shaft 8 is attached to the front and rear of the bogie frame 1. As shown in FIG. 1A, a pair of yaw damper 5, air spring 7 and the like are provided in the width direction. In contrast, the brake device 2, the main motor 3, the gear device 4 and the like are provided in pairs in the front-rear direction, and these various devices 2, 3, 4, 6 are pointed with respect to the center point M of the carriage. They are arranged symmetrically.

  As shown in FIGS. 2A and 2B, the under cover 10 of this embodiment is attached to the lower side of the carriage frame 1 by a number of fastening members 50 described later. FIG. 2A is a diagram of the cart as viewed from above, and the under cover 10 attached to the bottom of the cart is indicated by a two-dot chain line.

  As shown in FIGS. 2A and 3, the under cover 10 has a shape in which a part of a substantially square shape in plan view protrudes, and covers a wide range below the carriage frame 1. In the under cover 10, a part of the substantially quadrangular shape in plan view is located in point symmetry with respect to the center point N of the under cover 10, and as a result, the under cover 10 is located with respect to its center point N. The shape is point-symmetric. The under cover 10 of the present embodiment is attached to the carriage frame 1 with its own center point N coincident with the center point M of the carriage. In this state, the under cover 10 lowers the main motor 3 and the like downward. The brake device 2, the gear device 4, the yaw damper 5, a part of the air spring 7, the wheel shaft 8 and the like are exposed downward.

  As shown in FIG. 3, the under cover 10 of the present embodiment is divided into four plate members, two first divided plate members 11 having the same shape and the same size, and two pieces having the same shape and the same size. The second divided plate member 12 is used. The first divided plate member 11 is formed in a substantially L shape when viewed from the front, and is disposed at a point-symmetrical position with respect to the center point N of the undercover 10. The second divided plate member 12 is formed in a rectangular shape when viewed from the front, and is disposed at a point-symmetrical position with respect to the center point N of the undercover 10. The first divided plate material 11 is arranged in the front-rear direction of the vehicle body T with the under cover 10 attached to the carriage frame 1, and the second divided plate material 12 is arranged in the width direction of the vehicle body T. A number of attachment holes 10 a for attaching the fastening members 50 are formed in the undercover 10.

  Next, the structure of the undercover 10 will be described. First, the first divided plate material 11 will be described. As shown in FIG. 3, the two first divided plate members 11 are arranged in the front-rear direction of the vehicle body T when attached to the carriage frame 1. Since the two first divided plate members 11 have the same shape and the same size and are arranged point-symmetrically in the front-rear direction, here, the first divided plate arranged on the front side of the carriage frame 1 The plate material 11 will be described. Moreover, the front and rear of the divided plate members 11 and 12 referred to below correspond to the front and rear of the vehicle body T when the divided plate members 11 and 12 are attached to the carriage frame 1. The left and right of the divided plate members 11 and 12 correspond to the left and right when facing the front.

  As shown in FIG. 4, the first divided plate member 11 arranged on the front side of the carriage frame 1 includes a first portion 13 having a rectangular shape in front view, and a second portion 14 having a rectangular shape in front view smaller than the first portion. As a whole, it is formed in a substantially L shape in front view. While the rear end edge of the first divided plate member 11 is linear, the front end edge of the first portion 13 projects forward at the front end portion, and the front end edge of the second portion 14 is located behind the front end edge of the first portion 13. doing.

  The first divided plate material 11 is formed by press-molding a hollow plate material, and has a honeycomb structure in which a plurality of hexagonal columnar cells opened in the plate thickness direction are arranged in parallel. At all the edges 11a of the first divided plate material 11, the hollow plate material is compressed, and the honeycomb structure inside the hollow plate material is not exposed to the outside. Therefore, it becomes difficult for air to enter the hollow plate member during vehicle travel, and the increase in air resistance can be suppressed. In addition, noise during vehicle travel can be suppressed.

  The front end portion of the first portion 13 of the first divided plate member 11 is formed with a curved inclined surface 13a that gradually inclines upward as it goes forward, and the front end portion of the second portion 14 as it goes forward. A curved inclined surface 14a that is gradually inclined upward is formed. The shapes of the inclined surfaces 13 a and 14 a are designed so that the space between the lower end of various devices covered by the under cover 10 from below and the under cover 10 is as small as possible. By making the inclined surfaces 13a and 14a have such shapes, it is possible to reduce the air resistance with respect to the first divided plate member 11 when the vehicle travels, and to suppress noise. Moreover, the attachment state of the 1st division | segmentation board | plate material 11 at the time of vehicle travel can be stabilized.

  A side wall 13b is formed at the front portion of the right edge of the first portion 13. The side wall 13 b is erected in a substantially vertical state from the right edge of the first portion 13. The rear edge 13c (11a) of the side wall 13b has a curved shape that gradually inclines downward toward the rear.

  A side wall 13d is formed at the front portion of the left edge of the first portion 13. The side wall 13d is erected in a substantially vertical state from the left edge of the first portion 13. The rear end edge of the side wall 13d has a curved shape that gradually inclines downward toward the rear, and the side wall 13d is smoothly connected to the inclined surface 14a of the second portion 14 at the rear end edge.

  The flat portion 13e located rearward from the inclined surface 13a of the first portion 13 and the flat portion 14b located rearward from the inclined surface 14a of the second portion 14 are horizontal when the first divided plate member 11 is attached to the carriage frame 1. Is a smooth surface. A large number of attachment holes 10a for attaching a fastening member 50 described later are provided in the plane portions 13e and 14b. FIG. 4 shows a state in which the fastening member 50 is attached to one of the attachment holes 10a. A concave portion 10b that is recessed downward from the upper surface of the flat surface portions 13e and 14b is formed on the upper surface of the flat surface portions 13e and 14b outside the peripheral edge of the mounting hole 10a. On the lower surface of the portions 13e and 14b, a concave portion 10c that is recessed upward from the lower surface of the flat portions 13e and 14b is formed. In FIG. 4, only the recess 10b on the upper surface is shown, and the recess 10c on the lower surface is shown in FIG. As shown in FIG. 4, the honeycomb structure inside the hollow plate member is exposed to the outside on the inner peripheral surface of the mounting hole 10a. However, the honeycomb structure is exposed to the outside by thermally melting the inner peripheral surface. It is good also as a state which is not exposed.

  Next, the second divided plate material 12 will be described. As shown in FIG. 3, the two second divided plate members 12 are arranged in the left-right direction of the vehicle body T when attached to the carriage frame 1. The two second divided plate members 12 have the same shape and the same size. The second divided plate member 12 disposed on the right side of the carriage frame 1 will be described here because it is disposed point-symmetrically in the left-right direction.

  The second divided plate material 12 is formed by press-molding a hollow plate material, and has a honeycomb structure in which a plurality of hexagonal columnar cells opened in the plate thickness direction are arranged in parallel. At all the edges 12a of the second divided plate material 12, the hollow plate material is compressed, and the honeycomb structure inside the hollow plate material is not exposed to the outside. Therefore, an increase in air resistance during vehicle travel is suppressed, and noise during vehicle travel is suppressed.

  As shown in FIG. 5, the second divided plate member 12 disposed on the right side of the carriage frame 1 is formed in a rectangular shape in front view. The front edge and the rear edge of the second divided plate member 12 are linear. The front end portion of the second divided plate 12 is formed with a curved inclined surface 12b that gradually inclines upward as it goes forward, and the rear end portion has a curved shape that gradually inclines upward as it goes backward. An inclined surface 12c is formed. The shapes of the inclined surfaces 12b and 12c are designed so that the space between the lower end of various devices covered by the under cover 10 from below and the under cover 10 is as small as possible. By forming the inclined surfaces 12b and 12c in such a shape, it is possible to reduce the air resistance against the second divided plate member 12 when the vehicle travels and to suppress noise, and the mounting state of the second divided plate member 12 when the vehicle travels Can be stabilized.

  A side wall 12 d is formed on the right edge of the second divided plate member 12. The side wall 12d is erected in a substantially vertical state from the right edge of the second divided plate member 12. A side wall 12e is formed at the rear portion of the left edge of the second divided plate member 12. The side wall 12 e is erected in a substantially vertical state from the left edge of the second divided plate member 12. The front edge 12f (12a) of the side wall 12e has a curved shape that gradually inclines downward as it goes forward.

  Between the inclined surface 12b and the inclined surface 12c of the 2nd division board material 12, the plane part 12g as a smooth surface which becomes horizontal when the 2nd division board material 12 is attached to the bogie frame 1 is formed. A large number of attachment holes 10a for attaching fastening members 50 described later are provided in the flat surface portion 12g. A concave portion 10b that is recessed downward from the upper surface of the flat surface portion 12g is formed on the upper surface of the flat surface portion 12g outside the peripheral edge of the mounting hole 10a. A recess 10c (shown in FIG. 12) that is recessed upward from the lower surface of the planar portion 12g is formed. Although the honeycomb structure inside the hollow plate material is exposed to the outside on the inner peripheral surface of the mounting hole 10a, the honeycomb structure may not be exposed to the outside by thermally melting the end face.

  As shown in FIG. 6, the under cover 10 has a first divided plate member 11 positioned in the front direction when the under cover 10 is attached to the carriage frame 1, with the inclined surface 13 a directed forward, and positioned in the rear direction. The plate material 11 is disposed in a state where the inclined surface 13a is directed rearward. The right second divided plate member 12 is disposed with the inclined surface 12b facing forward, and the left second divided plate member 12 is disposed with the inclined surface 12b facing rearward. At this time, the rear edge 13c (11a) of the side wall 13b of the front first divided plate member 11 is arranged along the side edge 12a of the inclined surface 12b of the right second divided plate member 12, There is almost no gap between the edge 13c and the side edge 12a. The left side edge 11a of the second portion 14 of the front first divided plate member 11 is arranged along the rear edge 12f (12a) of the side wall 12e of the left second divided plate member 12. Thus, almost no gap is formed between the end edge 11a and the end edge 12f. This relationship is the same between the rear first divided plate member 11 and the left and right second divided plate members 12. Further, there are almost no gaps between the edge 11a of the first divided plate material 11 adjacent in the front-rear direction and between the edge 11a of the first divided plate material 11 adjacent in the left-right direction and the edge 12a of the second divided plate material 12. Not formed. Therefore, when the under cover 10 is attached to the carriage frame 1, the gaps between the divided plate members 11, 12 are hardly formed, so that the air resistance is increased and the divided plate members 11, 12 are It is possible to suppress fluttering and the generation of noise accompanying these.

Next, the structure of the hollow plate material constituting the under cover 10 of the present embodiment will be described.
As shown in FIG. 7A, the hollow plate material of the present embodiment is formed by joining laminate sheets 30 and 40 to the upper and lower surfaces of the core layer 20 in which a plurality of cells S are arranged in parallel by heat welding. Yes. As shown in FIGS. 7B and 7C, the core layer 20 is a sheet material made of polyamide resin and is formed by folding a single sheet material formed into a predetermined shape. The core layer 20 includes an upper wall 21, a lower wall 22, and an intermediate wall 23 that is erected between the upper wall 21 and the lower wall 22 and has hexagonal columnar cylindrical portions arranged side by side. In addition, the upper wall 21, the lower wall 22, and the intermediate wall 23 define hexagonal columnar cells S in the core layer 20.

  As shown in FIGS. 7B and 7C, the cells S partitioned in the core layer 20 include first and second cells S1 and S2 having different configurations. As shown in FIG. 7B, the upper end of the first cell S1 is closed by the upper wall 21 of the two-layer structure, and the lower end is closed by the lower wall 22 of the single-layer structure. The layers of the upper wall 21 of this two-layer structure are joined together. On the other hand, as shown in FIG. 7C, the upper end of the second cell S2 is closed by the upper wall 21 of the single layer structure, and the lower end thereof is closed by the lower wall 22 of the two layer structure. The layers of the lower wall 22 of this two-layer structure are joined together. Further, as shown in FIGS. 7B and 7C, the space between the adjacent first cells S <b> 1 and the space between the adjacent second cells S <b> 2 are each partitioned by an intermediate wall 23 having a two-layer structure. Yes.

  As shown to Fig.7 (a), 1st cell S1 and 2nd cell S2 are arrange | positioned so that 1st cell S1 or 2nd cell S2 may adjoin, and may form a row | line | column in X direction. In the Y direction orthogonal to the X direction, the columns of the first cells S1 and the columns of the second cells S2 are alternately arranged adjacent to each other. And by these 1st cell S1 and 2nd cell S2, the core layer 20 has comprised the honeycomb structure. A hollow plate material is formed by bonding the laminate sheet 30 and the laminate sheet 40 to the upper and lower surfaces of the core layer 20 formed in this way by thermal welding.

  As shown in FIGS. 7B and 7C, the upper surface of the hollow plate material is composed of the upper wall 21 of the core layer 20 and the laminate sheet 30, and the lower surface of the hollow plate material is the lower wall 22 of the core layer. And a laminate sheet 40.

  As shown in FIG. 7B, the laminate sheet 30 on the upper surface is composed of a polyamide resin skin layer 30a disposed on the outer surface side (upper side in FIG. 7B) and an adhesive bonded to the skin layer 30a. The skin layer 30a is joined to the core layer 20 through the adhesive layer 30b. That is, the adhesive layer 30b is interposed between the core layer 20 and the skin layer 30a in the hollow plate material.

  As shown in FIG. 7 (b), the lower surface laminate sheet 40, like the upper surface laminate sheet 30, has a polyamide resin skin layer 40a disposed on the outer surface side (lower side in FIG. 7 (b)). The adhesive layer 40b is bonded to the skin layer 40a, and the skin layer 40a is bonded to the core layer 20 through the adhesive layer 40b. That is, the adhesive layer 40b is interposed between the core layer 20 and the skin layer 40a in the hollow plate material. The skin layer 40a and the adhesive layer 40b in the laminate sheet 40 are formed to have the same thickness as the skin layer 30a and the adhesive layer 30b in the laminate sheet 30, respectively. Note that, by bonding the laminate sheet 30 and the laminate sheet 40 of the same material and the same thickness to the upper surface and the lower surface of the core layer 20 respectively, warpage or the like is unlikely to occur as a hollow plate material.

Next, a mode in which one sheet material 100 is folded to form the core layer 20 will be described.
As shown in FIG. 8A, the sheet material 100 is formed by molding a single polycarbonate sheet into a predetermined shape. In the sheet material 100, the planar areas 110 and the bulging areas 120 having a band shape are alternately arranged in the width direction (X direction). In the bulging region 120, a first bulging portion 121 having a cross-section downward groove shape composed of an upper surface and a pair of side surfaces is formed over the entire extending direction (Y direction) of the bulging region 120. The angle formed between the upper surface and the side surface of the first bulge portion 121 is preferably 90 degrees. As a result, the cross-sectional shape of the first bulge portion 121 is a downward U-shape. Further, the width of the first bulging portion 121 (the length of the upper surface in the short direction) is equal to the width of the planar region 110, and the bulging height of the first bulging portion 121 (the length of the side surface in the short direction). ) Is set to be twice as long.

  As shown in FIG. 8A, in the bulging region 120, a plurality of second bulging portions 122 having a trapezoidal shape obtained by bisecting a regular hexagon with the longest diagonal line are formed in the bulging region 120. It is formed so as to be orthogonal to the protruding portion 121. The bulge height of the second bulge portion 122 is set to be equal to the bulge height of the first bulge portion 121. Further, the interval between the adjacent second bulging portions 122 is equal to the width of the upper surface of the second bulging portion 122. The first bulging portion 121 and the second bulging portion 122 are formed by partially bulging the sheet upward using the plasticity of the sheet. The sheet material 100 can be formed from a single sheet by a known forming method such as a vacuum forming method or a compression forming method.

As shown in FIGS. 8A and 8B, the core layer 20 is formed by folding the sheet material 100 configured as described above along the boundary lines P and Q. Specifically, the sheet material 100 is valley-folded at the boundary line P between the flat region 110 and the bulging region 120 and is folded at the boundary line Q between the upper surface and the side surface of the first bulging portion 121. To compress in the X direction. Then, as shown in FIGS. 8B and 8C, the upper surface and the side surface of the first bulge portion 121 are folded and the end surface of the second bulge portion 122 and the planar region 110 are folded, so that One prismatic partition 130 extending in the Y direction is formed for one bulging region 120. The plate-like core layer 20 is formed by continuously forming such partition bodies 130 in the X direction.

  At this time, the upper wall 21 of the core layer 20 is formed by the upper surface and the side surface of the first bulge portion 121, and the lower wall 22 of the core layer 20 is formed by the end surface of the second bulge portion 122 and the planar region 110. It is formed. In addition, as shown in FIG.8 (c), the upper surface and the side surface of the 1st bulging part 121 in the upper wall 21 fold, and the part of the 2nd bulging part 122 in the lower wall 22 forms the two-layer structure. The portions where the end surface and the planar region 110 are folded to form a two-layer structure are overlapped portions 131, respectively.

  As shown in FIG. 8C, the hexagonal columnar region formed by folding the second bulging portion 122 is the second cell S2, and is partitioned between a pair of adjacent partitions 130. The hexagonal columnar region is the first cell S1. In the present embodiment, the upper surface and the side surface of the second bulging portion 122 constitute the side wall of the second cell S2, and between the side surface of the second bulging portion 122 and the second bulging portion 122 in the bulging region 120. The planar portion located constitutes the side wall of the first cell S1. And the contact part of the upper surfaces of the 2nd bulging part 122 and the contact part of the said plane parts in the bulging area | region 120 become the intermediate wall 23 which makes | forms a two-layer structure. Further, the upper end of the first cell S1 is closed by the pair of overlapping portions 131, and the lower end of the second cell S2 is closed by the pair of overlapping portions 131. In carrying out such a folding process, it is preferable to keep the sheet material 100 in a softened state by heat treatment.

  Next, the laminate sheet 30 and the laminate sheet 40 are bonded to the upper surface and the lower surface of the core layer 20 folded and formed as described above, respectively, by thermal welding. The laminate sheets 30 and 40 are bonded by thermally melting the adhesive layers 30b and 40b at a temperature higher than the temperature of the resin constituting the adhesive layers 30b and 40b. Thus, a hollow plate material is obtained in which the laminate sheets 30 and 40 are bonded to the upper and lower surfaces of the core layer 20 in which the plurality of cells S are arranged in parallel by heat welding.

Next, the fastening member 50 for attaching the under cover 10 to the carriage frame 1 will be described.
As shown in FIGS. 9, 10, and 12, the fastening member 50 includes metal support members 51 and 52, damping rubbers 53 and 54, and a metal tube 55. The support members 51 and 52 include a first support member 51 that supports the under cover 10 from the upper surface side, and a second support member 52 that supports the under cover 10 from the lower surface side. The damping rubbers 53 and 54 are configured by a first damping rubber 53 attached to the first support member 51 and a second damping rubber 54 attached to the second support member 52. The metal cylinder 55 is disposed inside the first damping rubber 53 and the second damping rubber 54. The first support member 51 is integrated with the first damping rubber 53 and the metal cylinder 55 by insert molding. Further, the second support member 52 is integrated with the second damping rubber 54 by insert molding.

  As shown in FIGS. 10 and 11, the first support member 51 is bent at a substantially right angle from the substantially cylindrical first tube portion 51a having a slightly larger diameter as it goes downward and from the lower end edge of the first tube portion 51a. , An annular first flange 51b extending outward, and an annular first lid 51c that is bent at a substantially right angle from the upper end edge of the first tube 51a and extends inward. The first flange 51b and the first lid 51c extend so as to be parallel to the upper and lower surfaces of the under cover 10 when the fastening member 50 is attached to the under cover 10. A first holding hole 51d in which the upper first damping rubber 53 is provided is formed in the central portion of the first lid portion 51c. A convex portion 51e extending along the circumferential direction is formed on the inner peripheral surface of the first tube portion 51a.

  As shown in FIGS. 10 and 11, the second support member 52 is inserted into the first tube portion 51 a and has a substantially cylindrical second tube portion 52 a having a slightly larger diameter as it goes downward, and the second tube. An annular second collar portion 52b that is bent at a substantially right angle from the lower end edge of the portion 52a and extends outward, and an annular second lid portion that is bent at a substantially right angle from the upper end edge of the second cylindrical portion 52a and extends inward. 52c. The second flange portion 52b and the second lid portion 52c extend so as to be parallel to the upper and lower surfaces of the under cover 10 when the fastening member 50 is attached to the under cover 10. A second holding hole 52d to which the lower second damping rubber 54 is attached is formed in the central portion of the second lid portion 52c. A concave portion 52e extending along the circumferential direction is formed on the outer peripheral surface of the second cylindrical portion 52a.

  As shown in FIGS. 10 and 11, the outer diameter of the second tube portion 52 a of the second support member 52 is equal to the outer diameter of the first tube portion 51 a by the thickness of the first tube portion 51 a of the first support member 51. It has a smaller diameter. Therefore, the second cylinder part 52a can be inserted into the first cylinder part 51a, and the outer peripheral surface of the second cylinder part 52a is the inner periphery of the first cylinder part 51a while being inserted into the first cylinder part 51a. It is in contact with the surface.

  Moreover, the 2nd cylinder part 52a is formed higher than the 1st cylinder part 51a. Specifically, when the second cylindrical portion 52a is inserted into the first cylindrical portion 51a and the upper surface of the second lid portion 52c contacts the lower surface of the first lid portion 51c, the upper surface of the first flange portion 51b. The height of the second cylindrical portion 52a is set so that a predetermined length H is formed between the second flange portion 52b and the lower surface of the second flange portion 52b. This length H is the same as the thickness of the under cover 10.

  As shown in FIG. 10, the convex part 51e formed in the internal peripheral surface of the 1st cylinder part 51a has the 2nd cylinder part 52a inserted in the 1st cylinder part 51a, and the upper surface of the 2nd cover part 52c is It is formed at a position corresponding to the concave portion 52e formed on the outer peripheral surface of the second cylindrical portion 52a in a state in contact with the lower surface of the first lid portion 51c.

  As shown in FIG.10 and FIG.11, the outer diameter of the 1st collar part 51b and the outer diameter of the 2nd collar part 52b are made the same. And the outer diameter of the 1st collar part 51b and the 2nd collar part 52b is made the same with the outer diameter of the recessed part 10b formed in the upper surface of the undercover 10, and the recessed part 10c formed in the lower surface.

  As shown in FIG. 12, the first damping rubber 53 has a substantially cylindrical shape, and includes an upper support portion 53a attached to the first lid portion 51c of the first support member 51, and a lower portion from the upper support portion 53a. And an inner support part 53b that is held in the first holding hole 51d of the first lid part 51c. An insertion hole 53 e into which the metal tube 55 is inserted is formed at the center of the first support member 51. The upper outer peripheral surface of the inner support portion 53b is formed with an inclined surface 53c that is inclined inward as it goes downward, and a lower cylindrical portion 53d that is provided continuously from the inclined surface 53c at the lower portion of the inner support portion 53b. Is formed.

  A cylindrical metal cylinder 55 is fitted in the center of the first damping rubber 53. The upper end surface of the metal tube 55 is substantially flush with the upper end surface of the upper support portion 53 a of the first damping rubber 53, and the lower end portion of the metal tube 55 is the inner support portion 53 b of the first damping rubber 53. Is substantially flush with the lower end surface of the lower cylindrical portion 53d. Further, the inner diameter of the metal cylinder 55 is slightly larger than the outer diameter of the connecting rod 61 attached to the carriage frame 1.

  As shown in FIG. 12, the second damping rubber 54 has a substantially cylindrical shape and is attached to the lower portion of the second lid portion 52 c of the second support member 52. On the upper inner peripheral surface of the second damping rubber 54, an inclined surface 54b that is inclined inward as it goes downward is formed. An insertion hole 54 a having an inner diameter slightly larger than the outer diameter of the lower end portion of the inner support portion 53 b in the first damping rubber 53 is formed at the center of the second damping rubber 54.

  The fastening member 50 of the present embodiment is in a state of being attached to the under cover 10 in advance, and the under cover 10 to which the fastening member 50 is attached is integrally attached to and removed from the bogie frame 1 of the under cover 10. Is.

  First, a method for attaching the fastening member 50 to the under cover 10 will be described. Here, for convenience, a member in which the first support member 51 on the upper surface side, the first damping rubber 53 and the metal cylinder 55 are integrated is referred to as a first fastening member 50a, and the second support member 52 and the second support member on the lower surface side. A member in which the damping rubber 54 is integrated is referred to as a second fastening member 50b. Further, the fastening member 50 is attached to all the mounting holes 10a formed in each first divided plate member 11 and each second divided plate member 12 constituting the under cover 10 by the same method, but here, the first divided plate member 11 The case where it attaches to one attachment hole 10a of the board | plate material 11 is demonstrated.

  As shown in FIG. 12, first, the second cylindrical portion 52a of the second support member 52 of the second fastening member 50b is inserted from below the attachment hole 10a formed in the first divided plate member 11. At this time, the outer diameter of the recess 10c formed outside the lower surface of the mounting hole 10a and the outer diameter of the second flange 52b of the second support member 52 are substantially the same. The lower cover 10b is accommodated in the recess 10c on the lower surface of the under cover 10, and the lower surface of the second flange 52b and the lower surface of the under cover 10 (first divided plate material 11) are flush with each other.

  Then, the 1st cylinder part 51a of the 1st support member 51 of the 1st fastening member 50a is externally fitted by the 2nd cylinder part 52a. At this time, the lower end portion of the lower cylinder portion 53 d in the inner support portion 53 b of the first damping rubber 53 of the first fastening member 50 a is inserted into the insertion hole 54 a formed in the second damping rubber 54 together with the lower end portion of the metal cylinder 55. The lower end surface of the lower cylinder portion 53 d and the lower end surface of the metal cylinder 55 in the inner support portion 53 b of the first damping rubber 53 are flush with the lower end surface of the second damping rubber 54.

  And as shown in FIG. 10, the upper surface of the 2nd cover part 52c contact | abuts to the lower surface of the 1st cover part 51c, and insertion in the 1st cylinder part 51a of the 2nd cylinder part 52a is controlled. In this state, the convex portion 51e formed on the inner peripheral surface of the first cylindrical portion 51a and the concave portion 52e formed on the outer peripheral surface of the second cylindrical portion 52a are engaged with each other, and the first support member 51 and the second support member are engaged. The member 52 is held in a retaining state. Further, the inclined surface 54 b of the second damping rubber 54 is pressed against the inclined surface 53 c of the first damping rubber 53. Thus, as shown in FIG. 10, the fastening member 50 in a state where the first fastening member 50 a and the second fastening member 50 b are joined is attached to the first divided plate member 11. At this time, the first flange 51b is accommodated in the recess 10b on the upper surface of the under cover 10, and the upper surface of the first flange 51b and the upper surface of the under cover 10 are flush with each other.

In this manner, the fastening members 50 are attached to all the attachment holes 10a formed in the two first divided plate members 11 and the two divided plate members 12.
Next, an attachment method for attaching the undercover 10 to the carriage frame 1 and a removal method for removing it from the carriage frame 1 will be described. In the present embodiment, the first divided plate member 11 and the second divided plate member 12 with the fastening member 50 attached are sequentially attached to cover the lower part of the carriage with the under cover 10, and the second member with the fastening member 50 attached thereto. The under cover 10 is removed from the lower part of the carriage by sequentially removing the first divided plate material 11 and the second divided plate material 12.

  As shown in FIG. 13, a plurality of rod-like connecting rods 61 are attached to the bogie frame 1 at the upper ends thereof so as to extend in the vertical direction. A thread (not shown) is threaded on the outer periphery of the lower portion of the connecting rod 61, and a nut 62 and an annular metal plate 63 are attached. The annular metal plate 63 has an outer diameter that is slightly larger than the outer diameter of the first damping rubber 53.

  Further, when the under cover 10 is attached to the carriage frame 1, an annular metal plate 64 and a nut 65 for attaching the fastening member 50 to the connecting rod 61 are provided in addition to the under cover 10 to which the fastening member 50 is attached. prepare. The annular metal plate 64 has an outer diameter slightly larger than the outer diameter of the second damping rubber 54, and a through hole 64 a having an inner diameter substantially the same as the outer diameter of the connecting rod 61 is formed at the center.

  First, the first divided plate member 11 is disposed below the bogie frame 1, the first divided plate member 11 is moved upward, and the connecting rod is inserted into the metal tube 55 of the fastening member 50 attached to the first divided plate member 11. The lower end of 61 is inserted. As a result, the connecting rod 61 has the first holding hole 51d of the first support member 51, the second holding hole 52d of the second support member 52, the insertion hole 53e of the first damping rubber 53, via the metal cylinder 55, It will be inserted into the insertion hole 54 a of the second damping rubber 54. When the connecting rod 61 is inserted into the metal cylinder 55 and the upper end surface of the first damping rubber 53 comes into contact with the metal plate 63 attached to the connecting rod 61, the lower end surface of the second damping rubber 54 is below. It will be in the state where the lower end part of connecting rod 61 projected.

  Subsequently, the through hole 64 a of the metal plate 64 is fitted on the lower end portion of the connecting rod 61 protruding from the lower end surface of the second damping rubber 54, and the lower end portion is tightened with the nut 65. The upper end surface of the first damping rubber 53 is substantially flush with the upper end surface of the metal tube 55, and the lower end surface of the inner support portion 53 b of the first damping rubber 53 is substantially the same as the lower end surface of the metal tube 55. Since they are flush with each other, it is difficult to form a gap between the upper and lower metal plates 63 and 64 and the first damping rubber 53 and the second damping rubber 54, and the under cover 10 is stabilized on the carriage frame 1. Fixed.

According to this embodiment, the following effects can be obtained.
(1) The under cover 10 of the present embodiment is made of a resin hollow plate material. Therefore, it is lighter than that made of metal. Moreover, the work burden at the time of attachment work of the undercover 10 and removal work is reduced.

  (2) The under cover 10 of this embodiment is divided into two first divided plate members 11 and two second divided plate members 12. Therefore, the size of one divided plate material 11 and 12 is reduced, and each divided plate material 11 and 12 can be reduced in weight.

  (3) The under cover 10 of the present embodiment is divided into a first divided plate material 11 and a second divided plate material 12 having different shapes and sizes. The first divided plate material 11 is composed of two pieces having the same shape and the same size, and the second divided plate material 12 is constituted of two pieces having the same shape and the same size. The two first divided plate members 11 are arranged point-symmetrically, and the two second divided plate members 12 are arranged point-symmetrically. Therefore, the under cover 10 divided into four can be constituted by two types of divided plate materials 11 and 12 having different shapes and different sizes. The types of the divided plate members 11 and 12 can be reduced while reducing the size of the divided plate members 11 and 12 constituting the under cover 10 and reducing the weight. Cost is advantageous.

  (4) Since the under cover 10 is made of resin, even if the rolled-up ballast hits the surface, the ballast is suppressed from bouncing back on the surface of the under cover 10. In the case of the resin undercover 10, the ballast bites into the resin, and the influence of the bounced ballast on the vehicle wiring, the track peripheral wall, and the like is suppressed as compared with the metal undercover.

  (5) The railway vehicle needs to be regularly inspected for safe driving, and at the time of inspection, an operation of removing and attaching the undercover 10 attached to the carriage frame 1 is necessary. The under cover 10 according to the present embodiment can reduce the size of one of the divided plate members 11 and 12, and thus has excellent workability when the under cover 10 is attached to or removed from the carriage frame 1. .

  (6) When the under cover 10 is attached to the carriage, a part of the front end portion protrudes forward, a part of the rear end portion protrudes rearward, and the entire front end portion and the rear end All of the parts are curved upward. Therefore, it is possible to suppress an increase in air resistance during vehicle travel. Generation of noise can be suppressed, and flapping of the undercover 10 can be suppressed.

  (7) The first divided plate member 11 has inclined surfaces 13a and 14a that are curved upward at one end, and the two first divided plate members 11 are arranged in the front-rear direction of the carriage. Further, the second divided plate material 12 is formed with inclined surfaces 12b and 12c that are curved upward at both ends, and the two second divided plate materials 12 are arranged in the left-right direction of the carriage. Therefore, inclined surfaces 12b, 12c, 13a, and 14a are formed in any of the front and rear directions of the undercover. Even when the vehicle traveling direction is reversed in the front-rear direction, an increase in air resistance with respect to the undercover 10 can be suppressed.

  (8) At all end edges 11a of the first divided plate member 11 and all end edges 12a of the second divided plate member 12, the honeycomb structure inside the hollow plate member is not exposed to the outside. Therefore, it becomes difficult for air to enter the hollow plate member during vehicle travel, and the increase in air resistance can be suppressed. In addition, noise during vehicle travel can be suppressed.

  (9) The hollow plate material constituting the under cover 10 is configured such that the polyamide resin skin layers 30 a and 40 a are bonded to the polyamide resin core layer 20. Since it is made of a polyamide resin, the undercover 10 having excellent impact resistance, heat resistance, and cold resistance can be obtained.

  (10) The fastening member 50 of the present embodiment includes support members 51 and 52 that support the upper and lower surfaces of the undercover, and vibration damping rubbers 53 and 54 provided in the support member. Therefore, by selecting an appropriate spring constant for the damping rubbers 53 and 54, the undercover 10 can be stably fixed while performing vibration isolation between the carriage frame 1 and the undercover 10.

(11) In the fastening member 50 of the present embodiment, the first support member 51 has a first holding hole 51 d and the second support member 52 has a second holding hole 52 d. In addition, an insertion hole 53 e is formed in the first damping rubber 53, and an insertion hole 54 a is formed in the second damping rubber 54. And
When the connecting rod 61 attached to the carriage frame 1 is inserted into the first holding hole 51d, the second holding hole 52d, the insertion hole 53e, and the insertion hole 54a through the metal cylinder 55, the fastening member 50 is inserted. Can be attached to the connecting rod 61 as a unit. The fastening member 50 can be easily attached and detached.

  (12) When the fastening member 50 of the present embodiment is attached to the under cover 10, the upper surface of the first flange 51 b of the first support member 51 and the upper surface of the under cover 10 are flush with each other, and the second support member 52. The lower surface of the second flange 52b and the lower surface of the under cover 10 are flush with each other. Therefore, air resistance during vehicle travel can be reduced, and noise can be suppressed.

  (13) In the fastening member 50 of the present embodiment, the first support member 51 and the second support member 52 are joined by the engagement of the convex portion 51e and the concave portion 52e. With a simple configuration, the first support member 51 and the second support member 52 can be engaged, and the fastening state of the fastening member 50 can be stabilized.

  (14) In the fastening member 50 of the present embodiment, the inclined surface 53 c is formed on the outer periphery of the lower cylindrical portion 53 d of the inner support portion 53 b of the first damping rubber 53, and the inclined surface 54 b is formed on the upper outer periphery of the second damping rubber 54. When the first fastening member 50a and the second fastening member 50b are fastened, the inclined surface 53c is pressed against the inclined surface 54b. Therefore, the first damping rubber 53 and the second damping rubber 54 can be firmly tightened.

  (15) The under cover 10 is attached to the bogie frame 1 and detached from the bogie frame 1 with the fastening member 50 attached. The fastening member 50 is attached by fastening the metal plate 64 and the nut 65 to the connecting rod 61 attached to the carriage frame 1, and the fastening member 50 is removed by attaching the metal plate 64 and the nut 65 from the connecting rod 61. It is done by removing. Since the under cover 10 can be detached and attached in an integrated state with the fastening member 50, the workability is improved and the complexity of component management is eliminated.

The above embodiment may be modified as follows, and these modified examples may be applied in appropriate combination.
In the present embodiment, the under cover 10 is divided into two types of divided plate materials, that is, two point-symmetric two first divided plate materials 11 and two point-symmetric two second divided plate materials 12, but the present invention is not limited to this. The under cover 10 may have only one type of point-symmetric divided plate material, or may have three or more types of point-symmetric pair of divided plate materials.

  In the present embodiment, both the two first divided plate members 11 and the two second divided plate members 12 are attached to the carriage frame 1 so as to be point-symmetric, but the present invention is not limited to this. It may be attached at a line-symmetrical position or may be attached at a non-symmetrical position.

  The under cover 10 of the present embodiment covers the main motor 3 and the like attached to the carriage frame 1 from below, while the brake device 2, the gear device 4, the yaw damper 5, a part of the air spring 7, the wheel shaft 8 and the like However, the present invention is not limited to this. The range covered with the under cover 10 can be selected as appropriate.

  -In this embodiment, although the case where the under cover 10 was attached with respect to the trolley | bogie with which various apparatuses were arrange | positioned by point symmetry was demonstrated, the trolley | bogie used as attachment object is not limited to this. Various devices do not necessarily have to be point-symmetric. In this case, the under cover 10 may be divided into a plurality of divided plate materials, and the shape and size thereof are not particularly limited. Each divided member may have a different shape and size.

  -Although the inclined surfaces 13a and 14a of the 1st division | segmentation board | plate material 11 and the inclination surface 12b of the 2nd division | segmentation board | plate material 12 were made into curved shape, the inclined surfaces 13a, 14a, and 12b do not need to be curved shape. It may be a flat inclined surface. Moreover, some of the inclined surfaces 13a, 14a, and 12b may be curved inclined surfaces, and some may be planar inclined surfaces.

  The hollow plate material is compressed at the edge 11a of the first divided plate material 11 and the edge 12a of the second divided plate material 12, and the honeycomb structure inside the hollow plate material is not exposed to the outside, but is not compressed. May be. For example, the outermost peripheral edges of the divided plate members 11 and 12 may be closed with a caulking material or the like. In addition, the hollow plate material may be exposed at the edge arranged in the left-right direction of the carriage frame 1.

  In the present embodiment, in the state where the end edge 11a of the first divided plate member 11 and the end edge 12a of the second divided plate member 12 are abutted with each other, no gap is generated between them. Not. For example, as shown in FIG. 16, the edge 11a, 12a of the 1st division board material 11 and the 2nd division board material 12 which were arranged in parallel by the left-right direction may be made into the state which overlaps with an up-down direction. In this case, the edge 11a of the first divided plate member 11 is formed with a portion having a predetermined width in the front-rear direction and a thickness compressed about half downward, and the edge 12a of the second divided plate member 12 is A portion having a predetermined width in the direction and a thickness compressed about half upward is formed. By overlapping the respective compressed portions, it is possible to prevent a gap from being generated between the first divided plate material 11 and the second divided plate material 12.

  The side wall 13b of the first portion 13 of the first divided plate member 11 of the present embodiment is erected in a substantially vertical state from the right edge of the first portion 13, and the side wall 13d of the first portion 13 is the first portion 13 is erected in a substantially vertical state from the left edge of 13. Further, the side wall 12 d of the second divided plate material 12 is erected in a substantially vertical state from the right edge of the second divided plate material 12, and the side wall 12 e of the second divided plate material 12 is extended from the left edge of the second divided plate material 12. It is erected almost vertically. However, the side walls 13b, 13d, 12d, and 12e may be erected in an inclined state that inclines outward as it goes upward. Moreover, you may stand in the inclination state which inclines slightly inward, so that it goes upwards.

  -When the under cover 10 of this embodiment is attached to the bogie frame 1, the edges 11a of the adjacent first divided plate members 11 are abutted, and the edges 12a of the adjacent second divided plate materials 12 are abutted. The edge 11a of the adjacent 1st division board material 11 and the edge 12a of the 2nd division board material 12 are faced | matched, and it is trying not to form a clearance gap between each. It is not limited to such a structure, For example, you may integrate between the edge 11a, 12a with the welding material etc. which fuse | melted resin. Moreover, you may form a hinge structure between the adjacent edges 11a and 12a.

  The hollow plate material constituting the under cover 10 of the present embodiment is configured such that the polyamide resin skin layers 30a and 40a are bonded to the polyamide resin core layer 20, but the resin constituting the under cover 10 Is not limited to this. Conventionally known thermoplastic resins such as polypropylene resin, polyethylene resin, and polycarbonate resin can be appropriately used. Moreover, what mix | blended various elastomer components with the thermoplastic resin can also be used. By mix | blending an elastomer component, the damage of the undercover 10 by the ballast wound up can be suppressed, and the rebound of the ballast which contacted the undercover 10 can be suppressed.

A hole for draining rainwater or the like may be formed in the undercover 10.
The core layer 20 is not limited to being configured by folding and forming one first sheet material 100. For example, a plurality of belt-like sheets are bent and arranged at predetermined intervals to constitute cell side walls, and sheet layers are arranged on both upper and lower sides of the belt-like sheets to constitute cell upper and lower walls. It may be.

  In the present embodiment, the hexagonal columnar cells S are defined in the core layer 20, but the shape of the cells S is not particularly limited. For example, it may be a polygonal shape such as a quadrangular prism shape or an octagonal prism shape, or a cylindrical shape. Further, the shape of the cell S may be a frustoconical shape. At that time, cells having different shapes may be mixed. Further, the cells do not have to be adjacent to each other, and a gap (space) may exist between the cells.

  The core layer 20 is not limited to the one in which the columnar cells S are partitioned. For example, a sheet layer may be bonded to both upper and lower surfaces of a core layer having a predetermined uneven shape. Examples of the core layer having such a configuration include those described in JP-A-2014-205341. Further, a plastic cardboard or the like having a harmonica cross section may be used.

  In the present embodiment, the first sheet material 100 is folded and formed to form the core layer 20 as a honeycomb structure in which the hexagonal cells S are defined in the core layer 20. The method is not limited to this. For example, as described in Japanese Patent No. 4368399, the core layer 20 as a honeycomb structure may be formed by sequentially folding a three-dimensional structure having a plurality of rows of trapezoidal cross-sectional protrusions. Good.

Although the laminate sheets 30 and 40 have a single layer structure, they may have a multilayer structure.
-As a thermoplastic resin which comprises the core layer 20 and the laminate sheets 30 and 40, you may use what added various functional resin. For example, it is possible to increase flame retardancy by adding a flame retardant resin to a thermoplastic resin. It is also possible to use what added various functional resins to all of the core layer 20 and the laminate sheets 30 and 40, and also use it for at least one of the core layer 20 and the laminate sheets 30 and 40. It is also possible to do.

  -Laminate sheets 30 and 40 themselves may be composed of fiber layers, or fiber layers may be further provided on the surfaces of the laminate sheets 30 and 40. For example, when the rolled up ballast hits the surface of the under cover 10, the resin layer is provided, so that the resin constituting the under cover 10 can be prevented from scattering.

  The laminate sheets 30 and 40 themselves may be constituted by a shock-absorbing soft sheet, or a shock-absorbing soft sheet may be further provided on the surface of the laminate sheets 30 and 40. When the rolled-up ballast hits the surface of the undercover 10, the impact can be absorbed more effectively.

The laminate sheets 30 and 40 themselves may be made of a thin metal plate such as aluminum.
-The shape of the fastening member 50 is not limited to the shape of this embodiment. The fastening member 70 may have a shape as shown in FIG. Here, the points different from the fastening member 50 of the present embodiment will be mainly described.

  The fastening member 70 shown in FIGS. 14A and 14B includes support members 71 and 72 and vibration damping rubbers 73 and 74, and the metal cylinder 55 is not provided. As shown in FIG. 15, the first cylindrical portion 71a of the first support member 71 that supports the upper surface of the undercover 10 has a cylindrical shape whose outer diameter does not change in the vertical direction except for the portion where the convex portion 71e is formed. The second cylindrical portion 72a of the second support member 72 that supports the lower surface of the undercover 10 is also formed in a cylindrical shape whose outer diameter does not change in the vertical direction except for the recess 72e and a step 72f that will be described later. ing. The inner diameter of the first holding hole 71d formed in the first lid portion 71c and the inner diameter of the second holding hole 72d formed in the second lid portion 72c are the same.

  As shown in FIG. 15, a step 72f extending in parallel with the second flange 72b is formed on the outer peripheral surface of the second cylindrical portion 72a. The step 72f is formed to be larger in diameter than the inner diameter of the first tube portion 71a, and the first tube portion 71a of the second tube portion 72a is brought into contact with the lower end of the inner peripheral surface of the first tube portion 71a. Insertion into is restricted. The formation position of the step 72f is such that when the lower end of the inner peripheral surface of the first tube portion 71a contacts the step 72f, the distance between the upper surface of the first flange portion 71b and the lower surface of the second flange portion 72b is The position is the same as the thickness. And in the state which the inner peripheral surface lower end of the 1st cylinder part 71a contact | abutted to the level | step difference 72f, the upper surface of the 2nd cover part 72c is contact | abutting to the lower surface of the 1st cover part 71c.

  As shown in FIG. 14 (b), the first damping rubber 73 has a substantially truncated cone shape in which the outer periphery of the lower end is cut out, and the lower end is the first holding hole of the first lid 71c. 71d. An insertion hole 73e having a diameter slightly larger than the outer diameter of the connecting rod 61 attached to the carriage frame 1 is formed at the center of the first damping rubber 73. The second damping rubber 74 has a substantially inverted truncated cone shape in which the outer periphery of the upper end portion is cut out, and the upper end portion is held in the second holding hole 72d of the second lid portion 72c. . An insertion hole 74 a having a diameter slightly larger than the outer diameter of the connecting rod 61 is formed at the center of the second damping rubber 74.

  Even if it is the fastening member 70 of such a shape, the undercover 10 can be attached stably. In addition, the first support member 71 and the second support member 72 can be easily positioned by forming the step 72f.

  In the fastening member 50 of the present embodiment, the outer diameter of the second cylindrical portion 52a of the second support member 52 is smaller than the outer diameter of the first cylindrical portion 51a, and is inserted into the first cylindrical portion 51a. In this state, the outer peripheral surface of the second cylindrical portion 52a is in contact with the inner peripheral surface of the first cylindrical portion 51a. The outer diameter of the second cylinder part 52a is not limited to this, and the outer diameter of the first cylinder part 51a is such that the outer peripheral surface of the second cylinder part 52a does not contact the inner peripheral surface of the first cylinder part 51a. It may be formed in a small diameter.

  -The fastening member 50 of this embodiment was made to engage the convex part 51e formed in the internal peripheral surface of the 1st cylinder part 51a, and the recessed part 52e formed in the outer peripheral surface of the 2nd cylinder part 52a. However, it is not limited to this. A concave portion may be formed on the inner peripheral surface of the first cylindrical portion 51a, and a convex portion may be formed on the outer peripheral surface of the second cylindrical portion 52a. Moreover, these convex part and recessed part may not be formed over the perimeter of the 1st cylinder part 51a and the 2nd cylinder part 52a, and may be formed in a part of inner peripheral surface. The shape does not have to be a convex shape or a concave shape extending in the horizontal direction, and may be an uneven shape having a circular arc shape, a polygonal shape, or an indefinite shape in plan view.

-The 1st cylinder part 51a and the 2nd cylinder part 52a are good also as a structure which engages with the engaging member as a different member from the 1st cylinder part 51a and the 2nd cylinder part 52a.
In the fastening member 50 of the present embodiment, the first support member 51 is formed with the annular first flange 51b, and the second support member 52 is formed with the annular second flange 52b. The shapes of the first flange 51b and the second flange 52b are not limited to this. It may be a polygonal shape or an indefinite shape. Moreover, the 1st collar part 51b and the 2nd collar part 52b may not be the same magnitude | size and shape. In this case, it is preferable that the recesses 10b and 10c formed in the under cover 10 have a shape that can accommodate the first flange 51b and the second flange 52b.

  A protrusion may be provided on the lower surface of the first flange 51b, or a protrusion may be provided on the upper surface of the second flange 52b. By providing the protrusion, the fastening member 50 is prevented from idling when fastened to the under cover 10.

  In the fastening member 50 of the present embodiment, the metal tube 55 is configured to be fitted in the center portion of the first damping rubber 53 attached to the first support member 51. However, the metal tube 55 has the second support. You may comprise so that it may fit in the 2nd damping rubber 54 attached to the member 52. FIG. Further, the metal cylinder 55 can be omitted.

  In the fastening member 50 of the present embodiment, the upper end surface of the metal tube 55 is substantially flush with the upper end surface of the first damping rubber 53, and the lower end surface of the metal tube 55 is the first damping rubber 53. However, the present invention is not limited to this. For example, the upper end surface of the metal tube 55 is positioned slightly below the upper end surface of the first vibration damping rubber 53, and the lower end surface of the metal tube 55 is the lower end surface of the inner support portion 53 b of the first vibration damping rubber 53. It may be located slightly lower. According to this configuration, by tightening the nut 65 to the connecting rod 61, the first damping rubber 53 and the second damping rubber 54 are crushed by elastic deformation, and the first damping rubber 53 and the second damping rubber are thus obtained. 54 is pressed against the upper and lower metal plates 63 and 64. The fastening member 50 is firmly fixed to the connecting rod 61, and the under cover 10 is stably fixed to the carriage frame 1.

  -Although the metal plates 63 and 64 were arrange | positioned up and down and the fastening member 50 of this embodiment was fastened with the nut 65, at least any one metal plate 63 and 64 can be abbreviate | omitted.

  A nut 62 and an annular metal plate 63 are attached to the lower outer periphery of the connecting rod 61 attached to the carriage frame 1, and are tightened to the lower end portion of the connecting rod 61 with an annular metal plate 64 and a nut 65. The nut 62 and the metal plate 63, or the metal plate 64 and the nut 65 may be integrally formed, or may be configured as separate bodies.

  In the present embodiment, when the fastening member 50 is attached to the under cover 10, the upper surface of the first flange portion 51 b of the first support member 51 is flush with the upper surface of the under cover 10, and the second support member 52 has the second surface. Although the lower surface of the flange portion 52b is configured to be flush with the lower surface of the under cover 10, it is not limited to this. At least one of the upper surface of the first flange part 51b and the lower surface of the second flange part 52b may be in a state of protruding from the upper and lower surfaces of the under cover 10, or may be in a recessed state.

  In the present embodiment, a plurality of rod-like connecting rods 61 are attached to the bogie frame 1 and the fastening member 50 is attached to the connecting rod 61. However, what is attached to the bogie frame 1 is the connecting rod. It may not be only 61. For example, as shown in FIG. 17, an upward U-shaped connecting member 66 may be attached to the carriage frame 1, and a connecting rod 67 may be attached to the connecting member 66.

  DESCRIPTION OF SYMBOLS 1 ... Bogie frame, 10 ... Under cover, 11 ... 1st division board material, 12 ... 2nd division board material, 20 ... Core layer, 30, 40 ... Laminate sheet, 50 ... Fastening member, 51 ... 1st support member, 51a ... 1st cylinder part, 51b ... 1st collar part, 51d ... 1st holding hole, 52 ... 2nd support member, 52a ... 2nd cylinder part, 52b ... 2nd collar part, 52d ... 2nd holding hole, 52f ... level | step difference 53 ... 1st damping rubber, 53e ... Insertion hole, 54 ... 2nd damping rubber, 54a ... Insertion hole, 61 ... Connecting rod, M ... Center point of carriage.

Claims (4)

An undercover made of a resin hollow plate attached to a railway carriage,
An undercover made up of a plurality of divided plate materials.   The two of the plurality of divided plate members have the same shape and the same size, and are arranged point-symmetrically with respect to the center point of the cart when attached to the cart. Under cover as described in. Each of the divided plate materials is divided into a first divided plate material and a second divided plate material that are at least one of different shapes and different sizes,
The first divided plate members are arranged point-symmetrically with respect to the center point of the carriage, and the second divided plate members are arranged point-symmetrically with respect to the center point of the carriage. Under cover as described in. In the state attached to the carriage, a part of the front end part protrudes forward, and a part of the rear end part protrudes rearward,
The under cover according to claim 1, wherein all of the front end portion and all of the rear end portion are curved upward.