seat

Abstract

A mounting bracket (10) includes a lower plate (11), an upper plate (12) and a vertical plate (13), a first rib (14), and a second rib (15). The lower plate (11) includes a first end portion, a second end portion (112), and a first side portion (113) and a second side portion (114). The upper plate (12) includes one end portion corresponding to the first end portion, and an opposite end portion (122) corresponding to the second end portion (112). The one end portion is connected to the lower plate (11). The opposite end portion (122) is separated from the lower plate (11). The vertical plate (13) is arranged to divide a space (S) formed between the lower plate (11) and the upper plate (12) into a first space (S1) on the first side portion (113) side and a second space (S2) on the second side portion (114) side. The first rib (14) protrudes from the vertical plate (13) to the first space (S1). The second rib (15) protrudes from the vertical plate (13) to the second space (S2).

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a mounting bracket that is joined to a cross beam of a truck of a railway vehicle, and that is for attaching a functional component.BACKGROUND ART

[0002] A railway vehicle includes a truck that runs on rails, and a vehicle body supported on the truck. The truck includes a truck frame as a skeleton. The truck frame is constituted by a pair of left and right side beams, and a cross beam. The truck includes functional components, such as a brake caliper, a motor, and a gear mechanism, in order to realize the functions of the truck. The functional components are attached to the mounting bracket joined to the cross beam by welding.

[0003] Referring to FIG. 1 and FIG. 2, the structure of a conventional mounting bracket will be described. FIG. 1 is a perspective view of a conventional mounting bracket 90. FIG. 2 is a front view of the conventional mounting bracket 90. FIG. 2 illustrates a situation at the time when mounting bracket 90 is seen from the cross beam side to which the mounting bracket 90 is to be joined. The conventional mounting bracket 90 is constituted by combining and welding a plurality of plate member.

[0004] Specifically, the mounting bracket 90 includes a lower plate member 91 having a flat shape, an upper plate member 92 corresponding to the lower plate member 91, two accessory plate members 93 and 93, and two vertical plate members 94 and 94. The lower plate member 91 is provided with a plurality of bolt holes 91a for fastening functional components with bolts. One end portion of the upper plate member 92 is joined to one end portion of the lower plate member 91 by welding. The opposing end portion of the upper plate member 92 is separated from the lower plate member 91. A space is formed between the lower plate member 91 and the upper plate member 92.

[0005] The two accessory plate members 93 and 93 are stacked on an upper surface of the upper plate member 92 with a space between them. Each of the accessory plate members 93 and 93 is joined to the upper plate member 92 by welding. For example, a tread cleaning device for removing debris adhering to wheels of a railway vehicle is attached to the accessory plate members 93 and 93. The two vertical plate members 94 and 94 are arranged to face each other in the space between the lower plate member 91 and the upper plate member 92. Each of the vertical plate members 94 and 94 is joined to the lower plate member 91 and the upper plate member 92 by welding.

[0006] As a technique related to a mounting bracket for attaching functional components, for example, Patent Literature 1 is known. Patent Literature 1 discloses a truck frame to which the mounting bracket and an upper plate portion of a cross beam are joined by butt welding. In the truck frame of Patent Literature 1, a notch hole is formed in the upper plate portion of the cross beam, and the mounting bracket is inserted in this notch hole so that the mounting bracket is joined to the upper plate portion.CITATION LISTPATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent No. 5772761SUMMARY OF INVENTIONTECHNICAL PROBLEM

[0008] As described above, the conventional mounting bracket 90 illustrated in FIG. 1 and FIG. 2 is constituted by joining a total of six plate members, i.e., the lower plate member 91, the upper plate member 92, the two accessory plate members 93 and 93, and the two vertical plate members 94 and 94, to each other by welding. Here, in order to join the plate members of the mounting bracket 90, it is necessary to perform welding in a very narrow range. In this case, in order to ensure the quality of a welded portion and to increase the reliability of the mounting bracket, an operator with advanced skills is required. However, it is becoming difficult to secure operators with advanced skills. Therefore, it is required to increase the reliability of a mounting bracket without depending on the skills of operators.

[0009] An objective of the present disclosure is to provide a reliable mounting bracket.SOLUTION TO PROBLEM

[0010] A mounting bracket according to the present disclosure is a mounting bracket to which a functional component is to be attached. The mounting bracket is joined to a cross beam of a truck of a railway vehicle. The mounting bracket includes a lower plate, an upper plate, a vertical plate, a first rib, and a second rib. The lower plate has a flat shape. The lower plate includes a first end portion, a second end portion, and a first side portion and a second side portion. The second end portion is separated from the first end portion, and is joinable to the cross beam. The first side portion and the second side portion are connected to the first end portion and the second end portion, respectively. The upper plate includes one end portion that corresponds to the first end portion, and an opposite end portion that corresponds to the second end portion and that is joinable to the cross beam. The one end portion is connected to the lower plate. The opposite end portion is separated from the lower plate. The vertical plate is connected to the lower plate and the upper plate. The vertical plate is arranged to divide a space formed between the lower plate and the upper plate into a first space on the first side portion side and a second space on the second side portion side. The first rib protrudes from the vertical plate to the first space. The second rib protrudes from the vertical plate to the second space.ADVANTAGEOUS EFFECTS OF INVENTION

[0011] With the mounting bracket according to the present disclosure, the reliability can be increased.BRIEF DESCRIPTION OF DRAWINGS

[0012] [FIG. 1] FIG. 1 is a perspective view of the conventional mounting bracket. [FIG. 2] FIG. 2 is a front view of a conventional mounting bracket. [FIG. 3] FIG. 3 is a perspective view of a mounting bracket according to the first embodiment. [FIG. 4] FIG. 4 is a top view of the mounting bracket according to the first embodiment. [FIG. 5] FIG. 5 is a side view of the mounting bracket according to the first embodiment. [FIG. 6] FIG. 6 is a front view of the mounting bracket according to the first embodiment. [FIG. 7] FIG. 7 is a perspective view of a mounting bracket according to a second embodiment. [FIG. 8] FIG. 8 is a top view of the mounting bracket according to the second embodiment. [FIG. 9] FIG. 9 is a side view of a mounting bracket according to a third embodiment. [FIG. 10] FIG. 10 is a side view of a mounting bracket according to a modification of the first and second embodiments. [FIG. 11] FIG. 11 is a side view of a mounting bracket according to a modification of the third embodiment. DESCRIPTION OF EMBODIMENTS

[0013] A mounting bracket according to an embodiment is a mounting bracket to which a functional component is to be attached. The mounting bracket is joined to a cross beam of a truck of a railway vehicle. The mounting bracket includes a lower plate, an upper plate, a vertical plate, a first rib, and a second rib. The lower plate has a flat shape. The lower plate includes a first end portion, a second end portion, and a first side portion and a second side portion. The second end portion is separated from the first end portion, and can be joined to the cross beam. The first side portion and the second side portion are connected to the first end portion and the second end portion, respectively. The upper plate includes one end portion that corresponds to the first end portion, and the opposite end portion that corresponds to the second end portion and that is joinable to the cross beam. The one end portion is connected to the lower plate. The opposite end portion is separated from the lower plate. The vertical plate is connected to the lower plate and the upper plate. The vertical plate is arranged to divide a space formed between the lower plate and the upper plate into a first space on the first side portion side and a second space on the second side portion side. The first rib protrudes from the vertical plate to the first space. The second rib protrudes from the vertical plate to the second space (a first configuration).

[0014] In the mounting bracket of the first configuration, the space formed between the lower plate and the upper plate is divided into the first space and the second space by the vertical plate. Furthermore, the first rib and the second rib protrude from the vertical plate to the corresponding first space and second space, respectively. In this case, the mounting bracket has an I-shaped cross-sectional shape with the lower plate, the upper plate, and the vertical plate connected to the lower plate and the upper plate. In addition, on the basis of the vertical plate, the lower plate protrudes to the first space side and the second space side, the upper plate also protrudes to the first space side and the second space side, and furthermore, the first rib and the second rib protrude to the corresponding first space and second space, respectively. Therefore, the mounting bracket can be integrally shaped by using a pair of dies. In short, the mounting bracket can be integrally shaped by forging. The mounting bracket can also be integrally shaped by casting. Accordingly, the mounting bracket of the first configuration does not need to be produced by welding each plate member, and thus is more reliable compared with conventional mounting brackets. Moreover, the mounting bracket of the first configuration has an I-shaped cross-sectional shape, and the rigidity is increased by reinforcement by the first rib and the second rib that protrude from the vertical plate. Accordingly, the mounting bracket of the first configuration can ensure the rigidity equivalent to that of a conventional mounting bracket that includes two vertical plates.

[0015] In the mounting bracket of the first configuration, each of the first rib and the second rib may be connected to the lower plate and the upper plate (a second configuration).

[0016] In the mounting bracket of the first configuration, at least one of the first rib and the second rib may not be connected to one or both of the lower plate and the upper plate (a third configuration).

[0017] In the mounting bracket of any one of the first to third configurations, the lower plate may be provided with a bolt hole for fastening the functional component with a bolt. In this case, when the length from an end on the second end portion side of the lower plate to a center position of the bolt hole is L, a lower end portion of each of the first rib and the second rib is preferably located within the range of 1 / 5×L or more to 1 / 2×L or less from the end on the second end portion side of the lower plate (a fourth configuration).

[0018] In the mounting bracket of any one of the first to fourth configurations, a through-hole is preferably formed in the vertical plate (a fifth configuration).

[0019] The through-hole is formed in the vertical plate of the mounting bracket of the fifth configuration. Accordingly, since the volume of the vertical plate can be reduced compared to a case where a through-hole does not exist, the weight of the mounting bracket can be reduced.

[0020] In the mounting bracket of any one of the first to fifth configurations, at least one of the first side portion and the second side portion of the lower plate may include a curved portion. The curved portion has a shape that is recessed inward of the lower plate (a sixth configuration).

[0021] In the mounting bracket of the sixth configuration, at least one of the first side portion and the second side portion of the lower plate includes a curved portion having a shape that is recessed inward of the lower plate. Accordingly, compared with a case where the first side portion and the second side portion of the lower plate are linear, that is, a case where curved portions are not included, the volume of the lower plate is decreased, and reduction of the weight of the mounting bracket can be achieved.

[0022] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each figure, the same or corresponding configurations are denoted by the same numerals, and the same description will not be repeated.[First Embodiment][Mounting bracket]

[0023] Referring to FIG. 3 to FIG. 6, the configuration of a mounting bracket 10 according to the present embodiment will be described. FIG. 3 is a perspective view of the mounting bracket 10 according to the present embodiment. As illustrated in FIG. 3, the mounting bracket 10 is joined to a cross beam 80 of a truck of a railway vehicle. Only a part of the cross beam 80 is schematically illustrated in FIG. 3. The mounting bracket 10 is a mounting bracket to which a functional component is to be attached. In an example of the present embodiment, the functional component to be attached to the mounting bracket 10 is a brake caliper. However, the functional component is not limited to this, and may be a motor, a gear mechanism, or the like.

[0024] Usually, a truck of a railway vehicle includes a truck frame constituted by a pair of side beams on the left and right (illustration is omitted), and the cross beam 80 that connects the pair of side beams. The side beams extend in a front-rear direction (moving direction) of the railway vehicle, and the cross beam 80 extends in a left-right direction (width direction). The mounting bracket 10 is joined to the cross beam 80 so as to protrude toward the front or the rear of the cross beam 80. Although not particularly limited, the joining method of the mounting bracket 10 and the cross beam 80 is, for example, welding. In the example of the present embodiment, the mounting bracket 10 is joined to the cross beam 80 by welding. Therefore, welded portions W are formed between the mounting bracket 10 and the cross beam 80.

[0025] Hereinafter, a specific configuration of the mounting bracket 10 according to the present embodiment will be described. Hereinafter, the front-rear direction, the left-right direction, and an up-down direction of the railway vehicle in a case where the mounting bracket 10 is joined to the cross beam 80 may be used for description of the mounting bracket 10.

[0026] FIG. 4 is a top view of the mounting bracket 10 according to the present embodiment. FIG. 5 is a side view of the mounting bracket 10 according to the present embodiment. FIG. 6 is a front view of the mounting bracket 10 according to the present embodiment. FIG. 6 illustrates a situation at the time when the mounting bracket 10 is seen from the rear (the cross beam 80 side). Referring to FIG. 4 to FIG. 6, the mounting bracket 10 includes a lower plate 11, an upper plate 12, a vertical plate 13, a first rib 14, and a second rib 15. The mounting bracket 10 is integrally shaped. That is, the lower plate 11, the upper plate 12, the vertical plate 13, the first rib 14, and the second rib 15 are continuous with a uniform material.

[0027] The lower plate 11 has a flat shape. The thickness direction of the lower plate 11 corresponds the up-down direction. In the example of the present embodiment, the lower plate 11 has a substantially rectangular shape. The lower plate 11 includes a first end portion 111, a second end portion 112, a first side portion 113, and a second side portion 114. The first end portion 111 and the second end portion 112 are separated in the front-rear direction. In the example of the present embodiment, the first end portion 111 is arranged substantially parallel to the second end portion 112. The first end portion 111 and the second end portion 112 extend in the left-right direction. The first end portion 111 and the second end portion 112 may be linear, or may be curved. The second end portion 112 can be joined to the cross beam 80 (FIG. 3).

[0028] The first side portion 113 and the second side portion 114 are connected to the first end portion 111 and the second end portion 112, respectively. The first side portion 113 and the second side portion 114 are separated in the left-right direction. In the example of the present embodiment, the first side portion 113 is arranged substantially parallel to the second side portion 114. The first side portion 113 and the second side portion 114 extend in the front-rear direction. The first side portion 113 and the second side portion 114 may be linear, or may include a curved portion.

[0029] The lower plate 11 includes an upper surface 11a and a bottom surface 11b. The bottom surface 11b is substantially parallel to the upper surface 11a. The upper plate 12 is connected to the upper surface 11a. A functional component is attached to the bottom surface 11b. The lower plate 11 is provided with at least one bolt hole for fastening the functional component with a bolt. The lower plate 11 may be provided with a plurality of bolt holes 11c, 11d, 11e, and 11f. In the example of the present embodiment, two bolt holes 11c and 11d are provided along the first side portion 113 at an interval in the front-rear direction, and furthermore, two bolt holes 11e and 11f are provided along the second side portion 114 at an interval in the front-rear direction. In the front-rear direction, the position of the bolt hole 11c may substantially coincide with the position of the bolt hole 11e. In addition, in the front-rear direction, the position of the bolt hole 11d may substantially coincide with the position of the bolt hole 11f.

[0030] The upper plate 12 is a portion corresponding to the lower plate 11. The upper plate 12 includes one end portion (hereinafter also referred to as "the upper first end portion") 121 corresponding to the first end portion 111, and the opposite end portion (hereinafter also referred to as "the upper second end portion") 122 corresponding to the second end portion 112. The upper second end portion 122 can be joined to the cross beam 80 (FIG. 3). The upper first end portion 121 is connected to the upper surface 11a of the lower plate 11. Specifically, the upper first end portion 121 is connected to the first end portion 111 side of the lower plate 11. The position at which the upper first end portion 121 is connected to the lower plate 11 is not particularly limited as long as it is a position closer to the first end portion 111 than the second end portion 112 of the upper surface 11a of the lower plate 11. The upper second end portion 122 is separated from the lower plate 11. The upper second end portion 122 is located substantially above the second end portion 112 of the lower plate 11. With the configurations of the lower plate 11 and the upper plate 12 as described above, a space S is formed between the lower plate 11 and the upper plate 12. In other words, the space S is the space sandwiched by the lower plate 11 and the upper plate 12.

[0031] In the example of the present embodiment, the upper plate 12 includes an inclined portion 12a that is inclined with respect to the lower plate 11, and a flat portion 12b that is substantially parallel to the lower plate 11. The inclined portion 12a includes the upper first end portion 121, and the flat portion 12b includes the upper second end portion 122. For example, a tread cleaning device for removing debris adhering to wheels of the railway vehicle may be attached to an upper surface of the inclined portion 12a. However, the upper plate 12 may be constituted only by the inclined portion 12a. In other words, the upper plate 12 does not have to include the flat portion 12b.

[0032] In side view of the mounting bracket 10, the angle θ formed by the inclined portion 12a and the lower plate 11 is, for example, 20 degrees or more and 45 degrees or less. However, in side view of the mounting bracket 10, the angle of the inclined portion 12a with respect to the lower plate 11 may be partially changed.

[0033] The vertical plate 13 is connected to the lower plate 11 and the upper plate 12. In the front-rear direction, the vertical plate 13 and the lower plate 11 may be connected to an end on the second end portion 112 side of the upper surface 11a of the lower plate 11 (refer to FIG. 5). The vertical plate 13 stands substantially perpendicularly to both the lower plate 11 and the upper plate 12. The thickness direction of the vertical plate 13 corresponds to the left-right direction.

[0034] The vertical plate 13 is arranged to divide the space S formed between the lower plate 11 and the upper plate 12 into a first space S1 on the first side portion 113 side and a second space S2 on the second side portion 114 side. In this case, the mounting bracket 10 has an I-shaped cross-sectional shape with the lower plate 11, the upper plate 12, and the vertical plate 13 (refer to FIG. 6). In the example of the present embodiment, the vertical plate 13 extends along the front-rear direction from a connecting portion between the lower plate 11 and the upper plate 12 toward the second end portion 112 and the upper second end portion 122 (refer to FIG. 5).

[0035] The vertical plate 13 includes a rear end portion 131 that is joinable to the cross beam 80. The rear end portion 131 has a curved shape corresponding to the cross beam in side view of the mounting bracket 10 (refer to FIG. 5).

[0036] The first rib 14 and the second rib 15 are arranged at both sides of the vertical plate 13 in the left-right direction, respectively. In the example of the present embodiment, each of the first rib 14 and the second rib 15 is connected to the lower plate 11 and the upper plate 12. The first rib 14 protrude from the vertical plate 13 to the first space S1 on the first side portion 113 side. The second rib 15 protrude from the vertical plate 13 to the second space S2 on the second side portion 114 side. Each of the first rib 14 and the second rib 15 stands substantially perpendicularly to the vertical plate 13.

[0037] The positions of the first rib 14 and the second rib 15 are not particularly limited in the front-rear direction. For example, the center positions of the thicknesses of lower end portions 14a and 15a of the first rib 14 and the second rib 15 may substantially coincide with the center positions of the bolt holes 11d and 11f that are provided at the rearmost among the plurality of bolt holes 11c, 11d, 11e, and 11f.

[0038] In another viewpoint, when the length from the end on the second end portion 112 side of the lower plate 11 to the center position of the bolt holes 11c and 11e is L, each of the lower end portions 14a and 15a of the first rib 14 and the second rib 15 is preferably located within the range of 1 / 5×L or more to 1 / 2×L or less from the end on the second end portion 112 side of the lower plate 11. That is, the center positions of the thicknesses of the lower end portions 14a and 15a are located within the range of 1 / 5×L or more to 1 / 2×L or less from the end on the second end portion 112 side of the lower plate 11. Here, the length L means the dimension in the front-rear direction from the end on the second end portion 112 side of the upper surface 11a of the lower plate 11 to the center position of the bolt holes 11c and 11e (refer to FIG. 4). As in the present embodiment, when the plurality of bolt holes 11c and 11d are provided in an area on the first rib 14 side of the lower plate 11, the length L is the length from the end on the second end portion 112 side of the upper surface 11a of the lower plate 11 to the center position of the (front) bolt hole 11c closest to the first end portion 111. Similarly, when the plurality of bolt holes 11e and 11f are provided in an area on the second rib 15 side of the lower plate 11, the length L is the length from the end on the second end portion 112 side of the upper surface 11a of the lower plate 11 to the center position of the (front) bolt hole 11e closest to the first end portion 111. In the front-rear direction, the lower end portion 14a of the first rib 14 and the lower end portion 15a of the second rib 15 may be entirely included within the range of 1 / 5×L or more to 1 / 2×L or less from the end on the second end portion 112 side of the lower plate 11.

[0039] In the example of the present embodiment, the first rib 14 and the second rib 15 have symmetrical shapes in the left-right direction. It can be said that in top view of the mounting bracket 10, the first rib 14 and the second rib 15 have line-symmetrical shapes centered on the vertical plate 13. Hereinafter, although the configuration of the first rib 14 will be described in detail, the second rib 15 also has the same configuration.

[0040] Referring to FIG. 5, in the example of the present embodiment, the angle φ formed by the first rib 14 and the lower plate 11 in side view of the mounting bracket 10 is 90 degrees. That is, the first rib 14 is perpendicular to the lower plate 11. However, the first rib 14 may be inclined with respect to the lower plate 11. The first rib 14 may be inclined toward the first end portion 111 of the lower plate 11, or may be inclined toward the second end portion 112. In side view of the mounting bracket 10, the angle φ formed by the first rib 14 and the lower plate 11 is, for example, 50 degrees or more and 130 degrees or less.

[0041] The mounting bracket 10 according to the present embodiment is produced by integral molding. That is, each portion (the lower plate 11, the upper plate 12, the vertical plate 13, the first rib 14, and the second rib 15) of the mounting bracket 10 is not joined by welding. The method of producing the mounting bracket 10 is not particularly limited, but is, for example, forging. As described above, the mounting bracket 10 has the I-shaped cross-sectional shape with the lower plate 11, the upper plate 12, and the vertical plate 13. In addition, on the basis of the vertical plate 13, the lower plate 11 protrudes toward the first space S1 and toward the second space S2, the upper plate 12 also protrudes toward the first space S1 and toward the second space S2, and furthermore, the first rib 14 and the second rib 15 protrude to the corresponding first space S1 and second space S2, respectively. Therefore, the mounting bracket 10 can be integrally shaped by using a pair of dies by forging. It is because when the vertical plate 13 is positioned on a mold parting surface of the dies, the shaped mounting bracket 10 can be removed in a stamping direction. The mounting bracket 10 produced by forging may have a shape with a draft angle. In this case, the bottom surface 11b of the lower plate 11 to which a functional component is to be fixed may be processed to be flat by machining or the like. In addition, the mounting bracket 10 can also be produced by casting as well as by forging.

[0042] It should be noted that the bolt holes 11c, 11d, 11e, and 11f provided in the lower plate 11 are formed by drilling. When a tread cleaning device is attached to the inclined portion 12a of the upper plate 12, the upper surface of the inclined portion 12a may be processed to be flat by machining or the like.[Effects]

[0043] In the mounting bracket 10 according to the present embodiment, the space S formed between the lower plate 11 and the upper plate 12 is divided into the first space S1 and the second space S2 by the vertical plate 13. Furthermore, the first rib 14 and the second rib 15 protrude from the vertical plate 13 to the corresponding first space S1 and second space S2, respectively. In this case, as described above, the mounting bracket 10 can be integrally shaped by forging or casting. Accordingly, the mounting bracket 10 according to the present embodiment does not need to be produced by welding each plate member, and thus is more reliable compared with conventional mounting brackets. Moreover, the mounting bracket 10 according to the present embodiment has the I-shaped cross-sectional shape, and the rigidity is increased by reinforcement by the first rib 14 and the second rib 15 that protrude from the vertical plate 13. Accordingly, the mounting bracket 10 can ensure the rigidity equivalent to that of a conventional mounting bracket that includes the two vertical plates.[Second Embodiment]

[0044] FIG. 7 is a perspective view of a mounting bracket 10A according to a second embodiment. FIG. 8 is a top view of the mounting bracket 10A according to the second embodiment. Referring to FIG. 7 and FIG. 8, the mounting bracket 10A of the present embodiment is different from the mounting bracket 10 (FIG. 3 to FIG. 6) in the first embodiment in the shapes of the lower plate 11 and the upper plate 12.

[0045] At least one of the first side portion 113 and the second side portion 114 of the lower plate 11 may include curved portions 113a and 114a. In an example of the present embodiment, the first side portion 113 of the lower plate 11 includes the curved portions 113a and straight portions 113b. Similarly, the second side portion 114 includes the curved portions 114a and straight portions 114b. The curved portions 113a and the curved portions 114a have shapes that are recessed inward of the lower plate 11. Specifically, each of the curved portions 113a and the curved portions 114a has an arc shape that is recessed inward in the left-right direction. Each of the straight portions 113b and the straight portions 114b is linear and is substantially parallel to the front-rear direction.

[0046] In the example of the present embodiment, the first side portion 113 includes the two curved portions 113a and the two straight portions 113b. The curved portions 113a and the straight portions 113b are connected alternately. The curved portions 113a are provided rearward of the rear bolt hole 11d of the two bolt holes 11c and 11d on the first side portion 113 side, and between the two bolt holes 11c and 11d, respectively. The straight portions 113b are provided at the positions corresponding to the two bolt holes 11c and 11d on the first side portion 113 side, respectively.

[0047] The curved portion 113a between the bolt holes 11c and 11d may be recessed inward in the left-right direction of the center position of the two bolt holes 11c and 11d on the first side portion 113 side. In that case, a dimension X1 in the left-right direction from the innermost portion of the curved portion 113a to the center position of the bolt hole 11c may be 3.25h or less, when the thickness of the lower plate 11 is h. Here, the thickness h means the thickness in the first end portion 111 of the lower plates 11. As in the present embodiment, when the plurality of bolt holes 11c and 11d are provided in the area on the first rib 14 side (the first side portion 113 side) of the lower plate 11, the dimension X1 is the dimension in the left-right direction from the innermost portion of the curved portion 113a to the center position of the (front) bolt hole 11c closest to the first end portion 111.

[0048] Similarly, the second side portion 114 includes the two curved portions 114a and the two straight portions 114b. The curved portions 114a and the straight portions 114b are connected alternately. The curved portions 114a are provided rearward of the rear bolt hole 11f of the two bolt holes 11e and 11f on the second side portion 114 side, and between the two bolt holes 11e and 11f, respectively. The straight portions 114b are provided at the positions corresponding to the two bolt holes 11e and 11f on the second side portion 114 side, respectively.

[0049] The curved portion 114a between the bolt holes 11e and 11f may be recessed inward in the left-right direction of the center position of the two bolt holes 11e and 11f on the second side portion 114 side. In that case, a dimension X2 in the left-right direction from the innermost portion of the curved portion 114a to the center position of the bolt hole 11e may be 1.25h or less. As in the present embodiment, when the plurality of bolt holes 11e and 11f are provided in the area on the second rib 15 side (the second side portion 114 side) of the lower plates 11, the dimension X2 is the dimension in the left-right direction from the innermost portion of the curved portion 114a to the center position of the (front) bolt hole 11e closest to the first end portion 111.

[0050] The upper plate 12 includes an upper first side portion 123 and an upper second side portion 124. Each of the upper first side portion 123 and the upper second side portion 124 is connected to the upper first end portion 121 and the upper second end portion 122. The upper first side portion 123 and the upper second side portion 124 are separated in the left-right direction. In the example of the present embodiment, the upper first side portion 123 includes a curved portion 123a and straight portions 123b. Similarly, the upper second side portion 124 includes a curved portion 124a and straight portions 124b. Each of the curved portion 123a and the curved portion 124a has an arc shape that is recessed inward in the left-right direction. Each of the straight portions 123b and the straight portions 124b is linear and is substantially parallel to the front-rear direction.

[0051] In the example of the present embodiment, the upper first side portion 123 includes one curved portion 123a and two straight portions 123b. The curved portion 123a is provided between the two straight portions 123b. Similarly, the upper second side portion 124 includes one curved portion 124a and two straight portions 124b. The curved portion 124a is provided between the two straight portions 124b. Although not particularly limited, each of the curved portion 123a and the curved portion 124a is provided at a position closer to the upper second end portion 122 than the upper first end portion 121 in the front-rear direction.

[0052] In the mounting bracket 10A according to the present embodiment, the first side portion 113 and the second side portion 114 of the lower plate 11 include the curved portions 113a and 114a having arc shapes that are recessed inward in the left-right direction, respectively. Furthermore, the upper first side portion 123 and the upper second side portion 124 of the upper plate 12 include the curved portions 123a and 124a having arc shapes that are recessed inward in the left-right direction, respectively. Accordingly, the volume becomes smaller compared to a case where each side portion of the lower plate 11 and the upper plate 12 is linear, that is, a case where curved portions are not included. Accordingly, with the mounting bracket 10A according to the present embodiment, reduction of the weight can be achieved.

[0053] In the example of FIG. 7 and FIG. 8, the two curved portions 113a are provided in the first side portion 113 of the lower plate 11, and the two curved portions 114a are provided in the second side portion 114. However, the number of the curved portions 113a in the first side portion 113 and the number of the curved portions 114a in the second side portion 114 are not limited to this, and may be one, or may be three or more. In addition, the number of the curved portions 123a in the upper first side portion 123 of the upper plate 12 and the number of the curved portions 124a in the upper second side portion 124 are also not limited to the above-described example. The upper first side portion 123 may include a plurality of curved portions 123a, and the upper second side portion 124 may include a plurality of curved portions 124a.[Third Embodiment]

[0054] FIG. 9 is a side view of a mounting bracket 10B according to the third embodiment. Referring to FIG. 9, the mounting bracket 10B of the present embodiment is different from the mounting bracket 10 (FIG. 3 to FIG. 6) in the first embodiment in the shape of the vertical plate 13.

[0055] In an example of the present embodiment, through-holes 13a and 13b are formed in the vertical plate 13. Each of the through-holes 13a and 13b penetrates the vertical plate 13 in a plate thickness direction. The shapes of the through-holes 13a and 13b are not particularly limited. In side view of the mounting bracket 10B, the through-holes 13a and 13b are, for example, circular, elliptical, rectangular, or the like. The through-holes 13a and 13b may have the same shape, or may have different shapes. The sizes of the through-holes 13a and 13b may also be the same, or may be different.

[0056] It is preferable that the through-holes 13a and 13b are formed at positions of the vertical plate 13 at which the stress that occurs when a functional component is attached to the mounting bracket 10B and the functional component is operated is relatively small. The through-holes 13a and 13b are formed at, for example, positions that are different from the first rib 14 and the second rib 15 (FIG. 6) in the front-rear direction. In the example of FIG. 9, the through-hole 13a is located closer to the first end portion 111 than (forward of) the first rib 14. The through-hole 13b is located closer to the second end portion 112 than (rearward of) the first rib 14.

[0057] In the mounting bracket 10B according to the present embodiment, the through-holes 13a and 13b are formed in the vertical plate 13. Accordingly, since the volume of the vertical plate 13 can be reduced compared with a case where the through-holes 13a and 13b do not exist, the weight of the mounting bracket 10B can be reduced.

[0058] In the example of FIG. 9, the two through-holes 13a and 13b are formed in the vertical plate 13. However, the number of through-holes formed in the vertical plate 13 is not limited to this. A single through-hole may be formed in the vertical plate 13, or three or more through-holes may be formed in the vertical plate 13.

[0059] The embodiments of the present disclosure have been described heretofore. However, the above-described embodiments are merely examples for implementing the present disclosure. Accordingly, the present disclosure is not limited to the above-described embodiments, and the above-described embodiments may be suitably modified and implemented within a scope that does not depart from the gist of the present disclosure.

[0060] In the first and second embodiments, the first rib 14 and the second rib 15 are connected to the lower plate 11 and the upper plate 12. That is, the first rib 14 and the second rib 15 extend in the up-down direction from the upper surface 11a of the lower plate 11 to a bottom surface of the upper plate 12. However, at least one of the first rib 14 and the second rib 15 may not be connected to one or both of the lower plate 11 and the upper plate 12. That is, in side view of the mounting bracket 10, at least one of the first rib 14 and the second rib 15 may be separated in the up-down direction from one or both of the lower plate 11 and the upper plate 12. For example, as illustrated in FIG. 10, the first rib 14 may be connected to the upper plate 12, and may not be connected to the lower plate 11. In addition, although illustration is omitted, the first rib 14 may be connected to the lower plate 11, and may not be connected to the upper plate 12. Furthermore, the first rib 14 may not be connected to any of the lower plate 11 and the upper plate 12. Similar to the first rib 14, the second rib 15 may be connected to one of the lower plate 11 and the upper plate 12 and may not be connected to the other, or may not be connected to both of the lower plate 11 and the upper plate 12. In a case where the first rib 14 and the second rib 15 are not connected to one or both of the lower plate 11 and the upper plate 12, when the length from an upper end to a lower end at the center position of the thickness of the first rib 14 and the second rib 15 in side view of the mounting bracket 10 is R, it is preferable that R ≥ 0.1H is satisfied. Here, H is the distance in the up-down direction between the lower plate 11 and the upper plate 12 at the position of the first rib 14 and the second rib 15. When the length R satisfies R ≥ 0.1H, the mounting bracket 10 can easily ensure the rigidity equivalent to that of the conventional mounting bracket 90 (FIG. 1) including the two vertical plates.

[0061] In addition, also in the third embodiment, the first rib 14 and / or the second rib 15 may not be connected to one or both of the lower plate 11 and the upper plate 12. For example, as illustrated in FIG. 11, in the mounting bracket 10B in which the through-holes 13a and 13b are formed in the vertical plate 13, the first rib 14 may be connected to the upper plate 12, and may not be connected to the lower plate 11.EXAMPLE

[0062] In the present example, the rigidity of the mounting bracket 10 according to the first embodiment was compared with the rigidity of the conventional mounting bracket 90 by FEM analysis. In the analysis, a load was applied downward in the up-down direction or to the right in the left-right direction to each of the mounting brackets 10 and 90, and the displacement of each of the mounting brackets 10 and 90 at the position where the load was applied was investigated. The results of the present example are shown in Table 1.[Table 1]

[0063] TABLE 1Load directionDisplacement [mm]Front-rear directionUp-down directionLeft-right directionComparative exampleUp-down direction-0.40-0.950.00Left-right direction0.000.000.20Inventive exampleUp-down direction-0.38-0.890.00Left-right direction0.000.000.22

[0064] Table 1 shows the displacement (mm) in the front-rear direction, the up-down direction, and the left-right direction in each of the mounting brackets 10 and 90. In Table 1, the analysis results of the mounting bracket 10 according to the first embodiment are shown as the inventive example, and the analysis results of the conventional mounting bracket 90 are shown as the comparative example. In Table 1, for convenience, the positive direction was defined as each of forward in the front-rear direction, upward in the up-down direction, and right in the left-right direction. Referring to Table 1, the displacement in the inventive example is comparable to the displacement in the comparative example in all the directions. From this, it can be seen that the mounting bracket 10 according to the first embodiment only includes one vertical plate 13, but has the rigidity equivalent to that of the conventional mounting bracket 90 including the two vertical plates.REFERENCE SIGNS LIST

[0065] 10, 10A, 10B: mounting bracket 11: lower plate 111: first end portion 112: second end portion 113: first side portion 113a: curved portion 114: second side portion 114a: curved portion 12: upper plate 121: one end portion (upper first end portion) 122: opposite end portion (upper second end portion) 13: vertical plate 13a, 13b: through-hole 14: first rib 14a: lower end portion 15: second rib 15a: lower end portion 80: cross beam S: space S1: first space S2: second space

Claims

1. A mounting bracket that is to be joined to a cross beam of a truck of a railway vehicle, and to which a functional component is to be attached, the mounting bracket comprising: a lower plate having a flat shape, the lower plate including a first end portion, a second end portion that is separated from the first end portion and that is joinable to the cross beam, and a first side portion and a second side portion that are connected to the first end portion and the second end portion, respectively; an upper plate including one end portion that corresponds to the first end portion, and an opposite end portion that corresponds to the second end portion and that is joinable to the cross beam, the one end portion being connected to the lower plate, the opposite end portion being separated from the lower plate; a vertical plate connected to the lower plate and the upper plate, the vertical plate being arranged to divide a space formed between the lower plate and the upper plate into a first space on the first side portion side and a second space on the second side portion side; a first rib protruding from the vertical plate to the first space; and a second rib protruding from the vertical plate to the second space.

2. The mounting bracket according to claim 1, wherein each of the first rib and the second rib is connected to the lower plate and the upper plate.

3. The mounting bracket according to claim 1, wherein at least one of the first rib and the second rib is not connected to one or both of the lower plate and the upper plate.

4. The mounting bracket according to claim 1, wherein the lower plate is provided with a bolt hole for fastening the functional component with a bolt, and when a length from an end on the second end portion side of the lower plate to a center position of the bolt hole is L, a lower end portion of each of the first rib and the second rib is located within a range of 1 / 5×L or more to 1 / 2×L or less from the end on the second end portion side of the lower plate.

5. The mounting bracket according to claim 1, wherein a through-hole is formed in the vertical plate.

6. The mounting bracket according to claim 1, wherein at least one of the first side portion and the second side portion includes a curved portion having a shape that is recessed inward of the lower plate.

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