Brake discs

Abstract

To easily position disc bodies and a wheel in fastening the pair of disc bodies to the wheel.SOLUTION: A brake disc includes a pair of disc bodies holding a wheel of a railway vehicle and provided with a penetrated wall having a through hole on a contact surface for braking rotation of the wheel by contact with a brake pad. The pair of disc bodies can be fastened in a manner of holding the wheel by a fastening member including a bolt and a nut. The penetrated wall disposed on one of the pair of disc bodies is partially provided with a restriction wall for restricting rotation of the nut caused by rotation of the bolt in fastening the pair of disc bodies to the wheel.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a brake disc. [Background technology]

[0002] A ventilated brake disc having a pair of disc bodies spaced apart from each other is known as a brake disc for a disc brake device. A ventilated brake disc having heat dissipation pins is disclosed in, for example, International Publication No. 2016 / 058792. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2016 / 058792 Summary of the Invention [Problem to be solved by the invention]

[0004] When fastening a pair of disk bodies to a wheel, it is required to make it easier to align the disk bodies with the wheel.

[0005] The present invention has been made in consideration of the above circumstances, and has an object to provide a brake disc that allows easy alignment of the disc body with the wheel. [Means for solving the problem]

[0006] The brake disc according to the invention comprises: a pair of disk bodies that sandwich the wheels of a railway vehicle and have through walls that form through holes in contact surfaces that come into contact with brake pads to brake the rotation of the wheels; The pair of disk bodies can be fastened to sandwich the wheel by fastening members including bolts and nuts, The through wall provided on one of the pair of disk bodies has a restricting wall provided in part thereof for restricting the rotation of the nut that accompanies the rotation of the bolt when the pair of disk bodies is fastened to the wheel.

[0007] In the brake disc according to the invention, The through wall in which the restriction wall is provided forms a first through hole, The through wall provided on the other of the pair of disk bodies, which does not have the regulating wall, may have a bolt accommodating wall in part for rotatably accommodating the head of the bolt, thereby forming a second through hole.

[0008] In the brake disc according to the invention, The nut has a polygonal prism shape, The restriction wall may be in surface contact with at least one of the side surfaces of the nut having a polygonal column shape.

[0009] In the brake disc according to the invention, The through wall further includes a shank accommodating wall that accommodates a shank of the bolt, The regulating wall forms a nut accommodating wall that accommodates the nut so as to be in surface contact with a side surface of the nut, and the nut accommodating wall and the shaft portion accommodating wall are formed continuously so that the nut accommodating wall is located on the contact surface side, The hole diameter of the first through hole on the contact surface may be smaller than the hole diameter of the first through hole at a portion where the nut accommodating wall is formed.

[0010] In the brake disc according to the invention, The restriction wall may be provided in the first through hole at a position farther from the contact surface than a maximum wear amount, which is a maximum amount that each of the pair of disk bodies can wear down.

[0011] In the brake disc according to the invention, The first through hole and the second through hole may have different shapes when viewed in a direction of a rotation axis of the wheel.

[0012] In the brake disc according to the invention, a plurality of the first through holes and a plurality of the second through holes are formed in one of the pair of disk bodies, The other of the pair of disks may have a plurality of the first through holes and a plurality of the second through holes formed therein.

[0013] In the brake disc according to the invention, the number of the first through holes formed in one of the pair of disk bodies is equal to the number of the first through holes formed in the other of the pair of disk bodies, The number of the second through holes formed in one of the pair of disk bodies may be the same as the number of the second through holes formed in the other of the pair of disk bodies.

[0014] In the brake disc according to the invention, an arrangement of the first through holes formed in one of the pair of disk bodies in the disk body is the same as an arrangement of the first through holes formed in the other of the pair of disk bodies in the disk body; The arrangement of the second through holes formed in one of the pair of disk bodies may be identical to the arrangement of the second through holes formed in the other of the pair of disk bodies.

[0015] In the brake disc according to the invention, the first through hole and the second through hole are provided in one of the pair of disk bodies in a rotationally symmetric arrangement as viewed from a rotation axis direction of the wheel, The other of the pair of disk bodies may be provided with the first through hole and the second through hole in a rotationally symmetric arrangement when viewed from the direction of the rotation axis of the wheel.

[0016] In the brake disc according to the invention, the through holes are arranged on one of the pair of disk bodies at equal intervals on a circumference centered on a rotation axis of the wheel, and the first through holes and the second through holes are arranged alternately; The through holes may be arranged on the other of the pair of disk bodies at equal intervals on a circumference centered on the rotation axis of the wheel, with the first through holes and the second through holes arranged alternately.

[0017] In the brake disc according to the invention, one of the pair of disk bodies is formed with only the first through holes as the through holes, The other of the pair of disks may have only the second through holes formed as the through holes. Effect of the Invention

[0018] According to the present invention, when fastening a pair of disk bodies to a wheel, it is possible to easily align the disk bodies with the wheel. [Brief description of the drawings]

[0019] [Figure 1] 1 is a front view showing a brake disc in a state where a pair of disc bodies are fastened to a wheel in the embodiment; [Diagram 2] FIG. 2 is a perspective view showing a state in which a part of the brake disc shown in FIG. 1 is cut away. [Diagram 3] FIG. 2 is a perspective view showing a first disk body in the embodiment. [Figure 4] 2 is an enlarged cross-sectional view showing a part of the cross section of the pair of disk bodies and the wheel taken along line CC in FIG. 1. [Diagram 5] 2 is an enlarged front view of the nut and its periphery in FIG. 1. [Figure 6] FIG. 2 is an enlarged front view of the periphery of the head of the bolt in FIG. [Figure 7]4 is a diagram showing the arrangement of first through holes and second through holes in a pair of disk bodies. FIG. [Figure 8] FIG. 2 is a perspective view showing a first disk body in the embodiment. [Figure 9] 4 is an enlarged view of a positioning portion according to the embodiment; FIG. [Figure 10] FIG. 2 is a perspective view showing a wheel in the embodiment. [Figure 11] 4 is an enlarged view of a positioned portion in the embodiment; FIG. [Figure 12] 4 is a diagram showing the arrangement of a positioned portion of a wheel and a wheel through hole in the embodiment; FIG. [Figure 13] 11A to 11C are diagrams showing how a pair of disk bodies are fastened to a wheel in the present embodiment. [Figure 14] 11A to 11C are diagrams showing how a pair of disk bodies are fastened to a wheel in the present embodiment. [Figure 15] 11 is a cross-sectional view showing a first through hole in Modification 1. FIG. [Figure 16] 13 is a cross-sectional view showing a first through hole in Modification 2. FIG. [Figure 17] 13 is a cross-sectional view showing a positioning portion and a positioned portion in Modification 3. FIG. [Figure 18] 13 is a cross-sectional view showing a positioning portion and a positioned portion in Modification 4. FIG. [Figure 19] 13 is a diagram showing the positional relationship between a positioning portion and a through hole in Modification 5. FIG. [Figure 20] 13 is a diagram showing an arrangement of first through holes and second through holes in Modification 6. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] An embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a front view showing a brake disc 1 in a state where a pair of disc bodies 10 are fastened to a wheel 20, as viewed from a rotation axis direction d2 described later. In the example shown in Fig. 1, a wheel 100 with a brake disc is formed, which includes the wheel 20 and the pair of disc bodies 10, by fastening the pair of disc bodies 10 to the wheel 20. Fig. 2 is a perspective view showing a part of the brake disc 1 cut out in a sector shape by cutting the brake disc 1 in Fig. 1 at the positions of the dashed line marked with the symbol A and the dashed line marked with the symbol B.

[0021] In order to clarify the directional relationship between the drawings, the rotational direction d1, the rotational axis direction d2, and the radial direction d3 of the wheel 20 are indicated by arrows in some drawings as directions common to the drawings. Also, in the drawings showing the brake disc 1 and the components constituting the wheel 100 with a brake disc, the directions are shown in a state in which the wheel 100 with a brake disc is formed, that is, in a state in which the pair of disc bodies 10 are fastened to the wheel 20.

[0022] The brake disc 1 according to this embodiment includes a pair of disc bodies 10. In the example shown in Fig. 1 and Fig. 2, the pair of disc bodies 10 sandwich the wheel 20. The pair of disc bodies 10 can be fastened to sandwich the wheel 20 by fastening members 30, which will be described later. The pair of disc bodies 10 are fastened to each other with the wheel 20 sandwiched therebetween, and are thereby also fastened to the wheel 20. In the example shown in Fig. 1 and Fig. 2, the pair of disc bodies 10 are fastened to sandwich the wheel 20 by fastening members 30.

[0023] When the pair of disk bodies 10 are fastened to the wheel 20, the wheel 20 and the brake disk 1 rotate in a rotation direction d1 around a rotation axis A1, which is represented by a dot in Fig. 1 and by a dashed line in Fig. 2. The direction in which the rotation axis A1 extends is also referred to as a rotation axis direction d2.

[0024] 1 and 2, the fastening member 30 includes a bolt 31 that fastens the pair of disk bodies 10 together so as to sandwich the wheel 20. In particular, the fastening member 30 includes a bolt 31 having a head 31a and a shaft portion 31b extending from the head 31a, and a nut 32 that engages with the shaft portion 31b of the bolt 31. The pair of disk bodies 10 can be fastened together by the bolt 31 and the nut 32 that is screwed onto the shaft portion 31b of the bolt 31.

[0025] Further, the wheel 20 and the pair of disk bodies 10 are provided with bolt through holes 40 penetrating the wheel 20 and the pair of disk bodies 10. The bolt 31 is passed through the bolt through hole 40, whereby the pair of disk bodies 10 are fastened to each other with the wheel 20 in between. In particular, the pair of disk bodies 10 can be fastened to each other by passing the bolt 31 through the bolt through hole 40 and then engaging the nut 32 with the shaft portion 31b. In the example shown in Figs. 1 and 2, the bolt through hole 40 extends in the rotation axis direction d2.

[0026] The pair of disk bodies 10 will be described. In this embodiment, the pair of disk bodies 10 have the same shape. Hereinafter, the disk body 10 shown at the front side in FIG. 2 of the pair of disk bodies 10 will be referred to as the first disk body 11. The disk body 10 shown at the rear side in FIG. 2 of the pair of disk bodies 10 will be referred to as the second disk body 12. FIG. 3 is a perspective view showing the first disk body 11 as viewed from the contact surface 10b side, which will be described later. Note that FIG. 3 shows a portion of the first disk body 11 that corresponds to the portion shown in FIG. 2.

[0027] Each of the pair of disk bodies 10 has a substantially disk-like shape with a hole formed in the center. Each of the pair of disk bodies 10 has, as a main surface, an inner surface 10a located on the wheel 20 side when fastened to the wheel 20, and a contact surface 10b located on the opposite side to the inner surface 10a. The contact surface 10b contacts a brake pad (not shown) to brake the rotation of the wheel 20. For example, the pair of brake pads are controlled by a brake caliper (not shown) so as to move toward and away from the respective contact surfaces 10b of the pair of disk bodies 10. In this case, one of the pair of brake pads controlled by the brake caliper contacts the contact surface 10b of one of the pair of disk bodies 10, and the other of the pair of brake pads contacts the contact surface 10b of the other of the pair of disk bodies 10. As a result, the pair of brake pads apply a braking force due to frictional force to the pair of disk bodies 10. The rotation of the wheel 20 is braked by transmitting the braking force from the pair of disk bodies 10 to the wheel 20.

[0028] Each of the contact surfaces 10b of the pair of disk bodies 10 is provided with a through-wall 41 that forms a through-hole 42. As shown in FIG. 3, each of the contact surfaces 10b is provided with a plurality of through-walls 41 that form the through-hole 42. As shown in FIG. 2, in a state in which the pair of disk bodies 10 is fastened to the wheel 20, a plurality of through-holes 42 formed in one of the pair of disk bodies 10 (for example, the first disk body 11) and a plurality of through-holes 42 formed in the other of the pair of disk bodies 10 (for example, the second disk body 12) overlap in the rotation axis direction d2. In addition, the through-holes 42 formed in the pair of disk bodies 10 also overlap in the rotation axis direction d2 with a wheel through-hole 45, which will be described later, formed in the wheel 20. Then, the bolt through-hole 40 is formed by the through-hole 42 of one of the pair of disk bodies 10, the wheel through-hole 45 of the wheel 20, and the through-hole 42 of the other of the pair of disk bodies 10 overlapping in the rotation axis direction d2.

[0029] Of the through holes 42 of the pair of disk bodies 10 that overlap in the rotation axis direction d2 to form the bolt through hole 40, the through hole 42 on the side where the nut 32 is disposed when the pair of disk bodies 10 are fastened using the bolt 31 and the nut 32 is referred to as a first through hole 43. Also, the through hole 42 on the side where the head 31a of the bolt 31 is disposed is referred to as a second through hole 44.

[0030] FIG. 4 is a cross-sectional view showing an enlarged part of the cross section of the pair of disk bodies 10 and the wheel 20 along the line CC in FIG. 1. In FIG. 4, the fastening member 30 disposed inside the bolt through hole 40 is shown not in cross section but in plan view perpendicular to the cross section. As shown in FIG. 4, each of the through walls 41 has a shaft portion housing wall 411 that houses the shaft portion 31b of the bolt 31. The through wall 41 that is located on the side where the nut 32 is disposed and forms the first through hole 43 has the shaft portion housing wall 411 and a first expanded diameter wall 431. The hole diameter w1 of the first through hole 43 in the portion where the first expanded diameter wall 431 is formed is larger than the hole diameter w2 of the first through hole 43 in the portion where the shaft portion housing wall 411 is formed. A part of the first expanded diameter wall 431 forms a restricting wall 432 described later. As shown in FIG. 4, the restricting wall 432 also functions as a nut accommodating wall 433 that accommodates the nut 32 when the pair of disk bodies 10 are fastened to the wheel 20. The restricting wall 432 (nut accommodating wall 433) restricts the rotation of the nut 32 arranged between the restricting wall 432 (nut accommodating wall 433). In the example shown in FIG. 4, the first through hole 43 accommodates a part of the shaft portion 31b of the bolt 31 between the shaft portion accommodating walls 411, and accommodates the nut 32 between the restricting wall 432 (nut accommodating wall 433). The restricting wall 432 (nut accommodating wall 433) and the shaft portion accommodating wall 411 that form the first through hole 43 are formed continuously so that the restricting wall 432 (nut accommodating wall 433) is located closer to the contact surface 10b of the disk body 10 where the first through hole 43 is formed than the shaft portion accommodating wall 411. Note that in a hole such as the through hole 42, the hole diameter means the width of the hole in a vertical direction perpendicular to the direction in which the hole extends. If the width of the hole in the perpendicular direction is not constant, the hole diameter means the smallest width of the hole in the perpendicular direction.

[0031] The second through hole 44 has a shaft portion housing wall 411 and a second expanded diameter wall 441. The hole diameter w3 of the second through hole 44 at the portion where the second expanded diameter wall 441 is formed is larger than the hole diameter w4 of the second through hole 44 at the portion where the shaft portion housing wall 411 is formed. A part of the second expanded diameter wall 441 forms a bolt housing wall 442 described later. In the example shown in FIG. 4, the second through hole 44 houses a part of the shaft portion 31b of the bolt 31 between the shaft portion housing walls 411 and houses the head portion 31a of the bolt 31 between the bolt housing walls 442. The bolt housing wall 442 and the shaft portion housing wall 411 forming the second through hole 44 are formed continuously so that the bolt housing wall 442 is located closer to the contact surface 10b of the disk body 10 where the second through hole 44 is formed than the shaft portion housing wall 411.

[0032] The restricting wall 432 will be described. The through wall 41 provided on one of the pair of disk bodies 10 is provided with a restricting wall 432 for restricting the rotation of the nut 32. The restricting wall 432 restricts the rotation of the nut 32 accompanying the rotation of the bolt 31 when the pair of disk bodies 10 are fastened to the wheel 20. When the pair of disk bodies 10 are fastened to the wheel 20, the bolt 31 is rotated around an axis A2 that passes through the center of the shaft portion 31b and extends in the direction in which the shaft portion 31b extends. The restricting wall 432 restricts the rotation of the nut 32 so that the nut 32 does not rotate with the rotation of the bolt 31 around the axis A2. The shaft portion 31b of the bolt 31 extends parallel to the rotation axis direction d2. In the example shown in FIG. 4, the bolt through holes 40 each include a first through hole 43 formed in one of the pair of disk bodies 10 and a second through hole 44 formed in the other of the pair of disk bodies 10. In addition, in the through-wall 41 that defines the first through-hole 43, a restriction wall 432 is provided in a part of the first enlarged diameter wall 431.

[0033] An example of a mode in which the restricting wall 432 restricts the rotation of the nut 32 will be described. In the brake disc 1 of this embodiment, when the pair of disc bodies 10 are fastened to the wheel 20, the following operations are performed. First, the nut 32 is placed between the restricting walls 432 of the first through hole 43 of the bolt through hole 40. Next, the shaft portion 31b of the bolt 31 is inserted from the second through hole 44, and the bolt 31 is rotated relative to the nut 32. Through the above operations, the nut 32 engages with the shaft portion 31b, and the pair of disc bodies 10 are fastened to the wheel 20.

[0034] Here, as an example, the nut 32 has a polygonal prism shape. Fig. 5 is an enlarged front view of the nut 32 and its periphery in the front view of Fig. 1. In the example shown in Fig. 5, the nut 32 has a polygonal prism shape, particularly a hexagonal prism shape, provided with a hole 32a that meshes with the shaft portion 31b of the bolt 31.

[0035] In the present embodiment, the restricting wall 432 of the first through hole 43 is provided so as to come into surface contact with at least one of the side surfaces 32b of the polygonal columnar nut 32. The surface contact of the nut 32 with the restricting wall 432 at the side surface 32b prevents the nut 32 from rotating in conjunction with the rotation of the bolt 31 when the bolt 31 is rotated relative to the nut 32 to engage the nut 32 with the shaft portion 31b.

[0036] In this way, the restricting wall 432 can prevent the nut 32 from rotating in association with the rotation of the bolt 31. In particular, when the restricting wall 432 is in surface contact with at least one of the side surfaces 32b of the polygonal column-shaped nut 32, the nut 32 can be effectively prevented from rotating. In the example shown in Fig. 5, the hexagonal column-shaped nut 32 is in surface contact with the restricting wall 432 on both side surfaces 32b.

[0037] 5, the minimum width w15 of the first through hole 43 at the portion where the restricting wall 432 is provided in the extending direction of the shaft portion 31b of the bolt 31 is smaller than the maximum width w16 of the nut 32 in the extending direction of the shaft portion 31b of the bolt 31. This also restricts the rotation of the nut 32.

[0038] Moreover, the restricting wall 432 (nut accommodating wall 433) is provided at a position in the first through hole 43 farther from the contact surface 10b than the maximum wear amount, which is the maximum amount that each of the pair of disk bodies 10 can wear. Here, the maximum wear amount refers to the thickness of the disk body 10 in the rotation axis direction d2 that can be worn by the contact surface 10b contacting the brake pad. In other words, the distance w5 between the restricting wall 432 (nut accommodating wall 433), which is a portion that accommodates the nut 32 when the pair of disk bodies 10 are fastened to the wheel 20, and the contact surface 10b of the disk body 10 in which the first through hole 43 is formed, is greater than the maximum wear amount (see FIG. 4). This makes it possible to prevent the nut 32 from coming into contact with the brake pad even when the disk body 10 is worn to the maximum wear amount.

[0039] In addition, when the pair of disk bodies 10 are fastened to the wheel 20, the distance w6 between the contact surface 10b of the disk body 10 in which the first through hole 43 is formed and the shaft portion 31b of the bolt 31 is greater than the maximum amount of wear (see Figure 4).

[0040] To explain an example of the definition of the maximum wear amount, consider a case where the disk body 10 is composed of a laminate having a first layer forming the contact surface 10b and a second layer overlapping the first layer from the side opposite to the side forming the contact surface 10b. The first layer is a layer that is allowed to wear due to use of the brake disk 1. The second layer is a layer that is not allowed to wear due to use of the brake disk 1. In this case, the maximum wear amount can be defined as the thickness of the first layer in the rotation axis direction d2.

[0041] The maximum amount of wear can also be defined as the distance between contact surface 10b and the position closest to wheel 20 to which the surface of the brake pad in contact with contact surface 10b can move due to the design of the brake caliper equipped with that brake pad.

[0042] In the example shown in FIG. 5, the regulating wall 432 has an outline consisting of a pair of straight line portions 432a parallel to each other and a pair of curved line portions 432b connecting the pair of straight line portions 432a when viewed from the rotation axis direction d2. The pair of curved line portions 432b are each a curved line having an approximately arc shape. The regulating wall 432 having such a shape can be easily formed on the disk body 10, for example, by the following method. First, a hole having a hole diameter corresponding to the hole diameter of the portion of the first through hole 43 where the shaft portion housing wall 411 is formed is formed on the disk body 10. Next, an end mill is brought into contact with the contact surface 10b of the disk body 10 to form the first expanded diameter wall 431 including the regulating wall 432. At this time, the regulating wall 432 having an outline consisting of a pair of straight line portions 432a and a pair of curved line portions 432b when viewed from the rotation axis direction d2 can be formed by only bringing an end mill into contact with the contact surface 10b of the disk body 10 and moving it in one direction.

[0043] The bolt accommodating wall 442 will be described. In this embodiment, a restricting wall 432 is provided in a part of the through wall 41 provided in one of the pair of disk bodies 10. A bolt accommodating wall 442 that rotatably accommodates the head 31a of the bolt 31 is provided in a part of the through wall 41 provided in the other of the pair of disk bodies 10 and not provided with the restricting wall 432. The through wall 41 provided with the bolt accommodating wall 442 forms a second through hole 44. In the example shown in FIG. 4, the bolt through holes 40 each include a first through hole 43 formed in one of the pair of disk bodies 10 and a second through hole 44 formed in the other of the pair of disk bodies 10. The bolt accommodating wall 442 is provided in a part of the second enlarged diameter wall 441 of the through wall 41 that forms the second through hole 44. This makes it possible to rotate the bolt 31 relative to the nut 32 so that the nut meshes with the shaft portion 31b, while allowing the head 31a of the bolt 31 to be accommodated between the bolt accommodating walls 442.

[0044] FIG. 6 is a front view showing an enlarged view of the head 31a of the bolt 31 in the front view of FIG. 1. In the example shown in FIG. 6, the hole diameter w7 of the portion of the second through hole 44 where the bolt housing wall 442 is formed is equal to or larger than the dimension w8 of the head 31a in the direction perpendicular to the direction in which the bolt 31 extends. This allows the bolt 31 to rotate relative to the nut 32 even when the head 31a is housed between the bolt housing walls 442. In the example shown in FIG. 6, the head 31a has a circular outline when viewed from the rotation axis direction d2. The portion of the second through hole 44 where the bolt housing wall 442 is formed is a round hole. The hole diameter w7 of the portion of the second through hole 44 where the bolt housing wall 442 is formed is equal to or larger than the diameter w8 of the head 31a.

[0045] In addition, when the pair of disk bodies 10 are fastened to the wheel 20, the distance w9 between the contact surface 10b of the disk body 10 in which the second through hole 44 is formed and the head 31a of the bolt 31 is greater than the maximum amount of wear (see Figure 4).

[0046] As shown in FIG. 5 and FIG. 6, the shape of the first through hole 43 and the shape of the second through hole 44 are different when viewed from the rotation axis direction d2 of the wheel 20. As an example, the shape of the first expanded diameter wall 431 and the shape of the second expanded diameter wall 441 are different, so that the shape of the first through hole 43 and the shape of the second through hole 44 are different when viewed from the rotation axis direction d2 of the wheel 20. In this embodiment, as described above, the restricting wall 432 of the first expanded diameter wall 431 has a contour consisting of a pair of straight parts 432a and a pair of curved parts 432b when viewed from the rotation axis direction d2. In addition, the bolt accommodating wall 442 of the second expanded diameter wall 441 has a circular contour when viewed from the rotation axis direction d2. This allows the first through hole 43 and the second through hole 44 to be distinguished when viewed from the rotation axis direction d2 of the wheel 20. This prevents the worker from confusing the first through hole 43 for accommodating the nut 32 with the second through hole 44 for inserting the bolt 31 when fastening the pair of disk bodies 10 to the wheel 20, which will be described later. In particular, when there is a preferred arrangement of the nuts 32 and the bolts 31 from the standpoint of the weight of the wheel 100 with brake disks and the balance of the fastening force, as will be described later, it is possible to prevent the nuts 32 and the bolts 31 from being arranged in an unpreferred arrangement due to worker error.

[0047] The arrangement of the first through holes 43 and the second through holes 44 in the pair of disk bodies 10 will be described. Fig. 7 is a diagram showing the arrangement of the first through holes 43 and the second through holes 44 in the pair of disk bodies 10. Fig. 7 shows the pair of disk bodies 10 as viewed from the contact surface 10b side. In Fig. 7, for the convenience of illustrating and facilitating understanding of the arrangement of the first through holes 43 and the second through holes 44, the shapes of the first through holes 43, the second through holes 44 and the pair of disk bodies 10 are illustrated more simply than in Fig. 3 and the like.

[0048] As shown in Fig. 7, one of the pair of disc bodies 10 (for example, the first disc body 11) has a plurality of first through holes 43 and a plurality of second through holes 44. The other of the pair of disc bodies (for example, the second disc body 12) also has a plurality of first through holes 43 and a plurality of second through holes 44. As a result, when fastening the pair of disc bodies 10 to the wheel 20, both a portion where the bolt 31 is inserted from the first disc body 11 side and fastened, and a portion where the bolt 31 is inserted from the second disc body 12 side and fastened are formed. As a result, the balance of fastening forces can be made more even in the wheel with brake disc 100 formed by fastening.

[0049] As shown in FIG. 7, the number of the first through holes 43 formed in one of the pair of disk bodies 10 (for example, the first disk body 11) is the same as the number of the first through holes 43 formed in the other of the pair of disk bodies 10 (for example, the second disk body 12). As shown in FIG. 7, the number of the second through holes 44 formed in one of the pair of disk bodies 10 (for example, the first disk body 11) is the same as the number of the second through holes 44 formed in the other of the pair of disk bodies 10 (for example, the second disk body 12). This provides the following effects. In the wheel 100 with a brake disk, the number of nuts 32 accommodated in one and the other of the pair of disk bodies 10 can be made the same. Also, the number of heads 31a of the bolts 31 accommodated in one and the other of the pair of disk bodies 10 can be made the same. Therefore, the weight of the wheel 100 with a brake disk can be made equal between the side where one of the pair of disk bodies 10 is located and the side where the other of the pair of disk bodies 10 is located. In particular, even if the weight of the nut 32 received in the first through hole 43 and the head 31a of the bolt 31 received in the second through hole 44 are different, the weight of the wheel 100 with a brake disc can be made uniform. This makes it possible to prevent the rotation axis A1 from wobbling due to uneven weight when the wheel 100 with a brake disc rotates.

[0050] In this embodiment, the first disk body 11 and the second disk body 12 each have six first through holes 43 and six second through holes 44. Therefore, the first disk body 11 and the second disk body 12 each have twelve through holes 42.

[0051] As shown in FIG. 7, the arrangement of the first through holes 43 formed in one of the pair of disk bodies 10 (for example, the first disk body 11) in the disk body 10 is the same as the arrangement of the first through holes 43 formed in the other of the pair of disk bodies 10 (for example, the second disk body 12) in the disk body 10. The arrangement of the second through holes 44 formed in one of the pair of disk bodies 10 (for example, the first disk body 11) in the disk body 10 is the same as the arrangement of the second through holes 44 formed in the other of the pair of disk bodies 10 (for example, the second disk body 12). In this embodiment, the arrangement of the first through holes 43 in the first disk body 11 is the same as the arrangement of the first through holes 43 in the second disk body 12. The arrangement of the second through holes 44 in the first disk body 11 is the same as the arrangement of the second through holes 44 in the second disk body 12.

[0052] In this embodiment, the number and arrangement of the first through holes 43 and the number and arrangement of the second through holes 44 are the same in one and the other of the pair of disc bodies 10. As a result, the one and the other of the pair of disc bodies 10 have the same shape. Since the one and the other of the pair of disc bodies 10 have the same shape, it is not necessary to separately produce the one and the other of the pair of disc bodies 10. This improves the productivity of the brake disc 1. In addition, there is no risk that an operator will confuse one and the other of the pair of disc bodies 10 when fastening the pair of disc bodies 10 to the wheel 20, as will be described later.

[0053] In order to fasten the pair of disk bodies 10 to the wheel 20, it is necessary to form the bolt through hole 40 by overlapping the first through hole 43 formed in one of the pair of disk bodies 10 and the second through hole 44 formed in the other in the rotation axis direction d2. In order to enable the formation of the bolt through hole 40 while using the pair of disk bodies 10, the disk body 10 to be used only needs to satisfy the following conditions. First, consider a virtual disk body in which the second through hole 44 is formed at the position where the first through hole 43 is formed in the disk body 10 to be used and the first through hole 43 is formed at the position where the second through hole 44 is formed. If it is possible to arrange the disk body 10 to be used and the virtual disk body in plane symmetry with their inner surfaces facing each other, it is possible to form the bolt through hole 40 while making the shape of one of the pair of disk bodies 10 the same as that of the other.

[0054] As shown in FIG. 7, the first through hole 43 and the second through hole 44 are provided in one of the pair of disk bodies 10 (for example, the first disk body 11) in a rotationally symmetric arrangement as viewed from the rotation axis direction d2 of the wheel 20. The first through hole 43 and the second through hole 44 are also provided in the other of the pair of disk bodies (for example, the second disk body 12) in a rotationally symmetric arrangement as viewed from the rotation axis direction d2 of the wheel 20. This provides the following effects. It is considered that the weights of the nut 32 and the head 31a of the bolt 31 are different. In this case, in the wheel 100 with brake disks, the nut 32 and the head 31a of the bolt 31 arranged on one side of the pair of disk bodies 10 can be arranged in a rotationally symmetric arrangement as viewed from the rotation axis direction d2. The nut 32 and the head 31a of the bolt 31 arranged on the other side of the pair of disk bodies 10 can be arranged in a rotationally symmetric arrangement as viewed from the rotation axis direction d2. This makes it possible to suppress wobbling of the rotation axis A1 due to uneven distribution of the nuts 32 and the heads 31a of the bolts 31 in the rotation direction d1 when the wheel 100 with brake discs rotates.

[0055] In this embodiment, a first through hole 43 and a second through hole 44 are provided in each of the pair of disk bodies 10 in a rotationally symmetric arrangement with respect to the rotation axis A1 of the wheel 20 as the center.

[0056] 7, in one of the pair of disk bodies 10 (for example, the first disk body 11), the through holes 42 are arranged at equal intervals on a circumference C1 centered on the rotation axis A1 of the wheel 20. In addition, in the other of the pair of disk bodies 10 (for example, the second disk body 12), the through holes 42 are arranged at equal intervals on a circumference C2 centered on the rotation axis A1 of the wheel 20.

[0057] As shown in FIG. 7, in each of the pair of disk bodies 10, the first through holes 43 and the second through holes 44 are alternately formed on a circumference centered on the rotation axis A1 of the wheel 20. In the example shown in FIG. 7, in one of the pair of disk bodies 10 (for example, the first disk body 11), the through holes 42 are arranged such that the first through holes 43 and the second through holes 44 are alternately arranged on the circumference of a circle C1. In addition, in the other of the pair of disk bodies 10 (for example, the second disk body 12), the through holes 42 are arranged such that the first through holes 43 and the second through holes 44 are alternately arranged on the circumference of a circle C2. This provides the following effects. It is considered that the weights of the nut 32 and the head 31a of the bolt 31 are different. In this case, in the wheel 100 with brake disks, the nut 32 and the head 31a of the bolt 31 can be alternately arranged on the circumference of the circle C1 on one side of the pair of disk bodies 10. Furthermore, the nuts 32 and the heads 31a of the bolts 31 can be arranged alternately on the circumference of the circle C2 on the other side of the pair of disk bodies 10. This makes it possible to more effectively prevent the rotation axis A1 from wobbling due to uneven distribution of the nuts 32 and the heads 31a of the bolts 31 in the rotation direction d1 when the wheel 100 with brake disks rotates.

[0058] In the example shown in FIG. 7, the circles C1 and C2 pass through the midpoints between the outer edge 10c and the inner edge 10d of the pair of disk bodies 10 in the radial direction d3 perpendicular to the rotation axis direction d2. The first through hole 43 and the second through hole 44 are formed on the circumference of the circle C1 and C2 passing through the midpoint. This provides the following effects. There is a concern that the disk body 10 may be warped due to heat. In this case, if the disk body 10 is fastened at a position biased toward the outer edge 10c in the radial direction d3, a large warp may occur on the inner edge 10d side, which is far from the fastening position. Similarly, if the disk body 10 is fastened at a position biased toward the inner edge 10d in the radial direction d3, a large warp may occur on the outer edge 10c side. By forming the first through hole 43 and the second through hole 44 on the circumference of the circle C1 and C2 passing through the midpoint, the disk body 10 is fastened to the wheel 20 on the circumference of the circle C1 and C2 passing through the midpoint. Therefore, the warp of the disk body 10 can be dispersed to the outer edge 10c side and the inner edge 10d side, thereby reducing the effect of the warp.

[0059] In addition, the through holes 42 being "arranged circumferentially" and the through holes 42 being "formed circumferentially" mean that a part of the through holes 42 is located on the circumference.

[0060] Next, the configuration of the inner surface 10a side of the disk body 10 will be described. Fig. 8 is a perspective view showing the first disk body 11 as viewed from the inner surface 10a side. Fig. 8 shows a portion of the first disk body 11 that corresponds to the portion shown in Fig. 2. As shown in Fig. 8, the brake disk 1 includes a plurality of heat dissipation members 13 provided so as to protrude from the main surfaces of each of the pair of disk bodies 10, and positioning portions 14 formed on each of the pair of disk bodies 10.

[0061] The heat dissipation members 13 are provided on the inner surfaces 10a of the pair of disk bodies 10 and protrude from the inner surfaces 10a. When the pair of disk bodies 10 are fastened to each other with the wheel 20 sandwiched therebetween, the multiple heat dissipation members 13 sandwich the wheel 20.

[0062] The provision of multiple heat dissipation members 13 increases the contact area between the brake disc 1 and the atmosphere. Frictional heat generated by friction when the brake pads come into contact with the contact surfaces 10b of the pair of disc bodies 10 is released to the atmosphere not only from the inner surfaces 10a and contact surfaces 10b of the pair of disc bodies 10 but also from the surfaces of the heat dissipation members 13. This allows the pair of disc bodies 10 to be efficiently cooled.

[0063] In the example shown in FIG. 8, the heat dissipation member 13 has a pin-like shape. Each of the pin-like heat dissipation members 13 extends along the rotation axis direction d2. In the example shown in FIG. 8, the heat dissipation member 13 is configured so that a cross section cut along a plane perpendicular to the rotation axis direction d2 has a substantially circular shape. The cross section of the pin-like heat dissipation member 13 cut along a plane perpendicular to the rotation axis direction d2 is not limited to a circle, and may be, for example, an ellipse, a polygon, or other shapes. Although not shown, the shape of the heat dissipation member 13 is not limited to a pin shape. The heat dissipation member 13 may have, for example, a fin shape, in other words, a substantially plate-like shape perpendicular to the inner surface 10a.

[0064] The positioning portion 14 will be described. The positioning portion 14 is a component that guides the pair of disk bodies 10 to contact the wheel 20 in an appropriate positional relationship when the pair of disk bodies 10 are brought into contact with the wheel 20 in order to fasten the pair of disk bodies 10 to the wheel 20. The positioning portion 14 is formed on each of the pair of disk bodies 10. When the pair of disk bodies 10 are fastened to the wheel 20, the positioning portion 14 engages with a positioned portion 21 of the wheel 20 described later. The positioning portion 14 engages with the positioned portion 21 to position each of the pair of disk bodies 10 with respect to the wheel 20. In the example shown in FIG. 8, the positioning portion 14 has a protruding shape protruding from the inner surface 10a. The positioning portion 14 protrudes in the height direction of the heat dissipation member 13 more than the plurality of heat dissipation members 13. In the example shown in FIG. 8, the height direction of the heat dissipation member 13 coincides with the rotation axis direction d2. The positioning portion 14 protrudes from the inner surface 10a more than the heat dissipation member 13 along the rotation axis direction d2.

[0065] In the example shown in FIG. 8, the positioning portion 14 has a base 15 having the same height as the heat dissipation members 13 in the height direction of the heat dissipation members 13, and a positioning protrusion 16 formed on a tip surface 15a of the base 15. The positioning protrusion 16 is a protrusion that protrudes from the tip surface 15a of the base 15 in the height direction of the heat dissipation members 13. The positioning protrusion 16 engages with a positioned portion 21, which will be described later. The positioning protrusion 16 is provided on a part of the tip surface 15a of the base 15, and is therefore thinner than the base 15. By having the base 15, the positioning portion 14 can ensure the strength of the positioning portion 14 while making the shape and dimensions of the portion that engages with the positioned portion 21 suitable for engagement. This makes it possible to make the positioning portion 14 less likely to break.

[0066] 8, the base portion 15 of the positioning portion 14 has a thickness greater than that of the pin-shaped heat dissipation member 13. The positioning protrusions 16 of the positioning portion 14 also have a thickness greater than that of the pin-shaped heat dissipation member 13. The positioning portions 14 are formed to be arranged at equal intervals on a circumference centered on the rotation axis A1 of the wheel 20. In this embodiment, each of the pair of disk bodies 10 has three positioning portions 14.

[0067] 9 is a diagram showing a state in which the positioning portion 14 having the positioning protrusion 16 is viewed from the rotation axis direction d2. The positioning protrusion 16 has side surfaces consisting of a pair of flat surfaces 16a facing each other and a pair of curved surfaces 16b connecting the pair of flat surfaces 16a. The pair of curved surfaces 16b each have a substantially arc-shaped outline when viewed from the rotation axis direction d2 as shown in FIG.

[0068] Next, the wheel 20 will be described. FIG. 10 is a perspective view showing the wheel 20 in this embodiment. Note that FIG. 10 shows a portion of the wheel 20 that corresponds to the portion shown in FIG. 2. The wheel 20 has a substantially disk-like shape with a hole formed in the center. As shown in FIG. 10, the wheel 20 has a first surface 20a and a second surface 20b. When fastening a pair of disk bodies 10 to the wheel 20, as shown in FIG. 2, the first surface 20a of the wheel 20 faces the inner surface 10a of the first disk body 11, and the second surface 20b of the wheel 20 faces the inner surface 10a of the second disk body 12. The wheel 20 is a wheel for a railway vehicle. In the example shown in FIG. 2, the first surface 20a is a surface that is located on the outer side of the railway vehicle when the wheel 20 is attached to the railway vehicle. Also, the second surface 20b is a surface that is located on the center side of the railway vehicle when the wheel 20 is attached to the railway vehicle.

[0069] 4, when the pair of disk bodies 10 are fastened to the wheel 20, the tip 13a of the heat dissipation member 13 of the second disk body 12 and the tip surface 15a of the base 15 are in contact with the second surface 20b. Also, the tip 13a of the heat dissipation member 13 of the first disk body 11 and the tip surface 15a of the base 15 are in contact with the first surface 20a.

[0070] The wheel 20 is formed with a wheel through hole 45 penetrating from the first surface 20a to the second surface 20b. When the pair of disk bodies 10 is fastened to the wheel 20, the wheel through hole 45 overlaps with a first through hole 43 formed in one of the pair of disk bodies 10 and a second through hole 44 formed in the other of the pair of disk bodies 10 in the rotation axis direction d2. As a result, the wheel through hole 45, the first through hole 43, and the second through hole 44 form a bolt through hole 40. As shown in FIG. 4, when the pair of disk bodies 10 is fastened to the wheel 20, the wheel through hole 45 accommodates a part of the shaft portion 31b of the bolt 31.

[0071] The wheel 20 is provided with a positioned portion 21 that engages with the positioning portion 14. The positioned portion 21 engages with the positioning portion 14 to position each of the pair of disk bodies 10 relative to the wheel 20. In this embodiment, the first surface 20a of the wheel 20 is provided with a positioned portion 21 that engages with the positioning portion 14 formed on the first disk body 11. The second surface 20b of the wheel 20 is provided with a positioned portion 21 that engages with the positioning portion 14 formed on the second disk body 12. On each of the first surface 20a and the second surface 20b of the wheel 20, the positioned portions 21 are provided so as to be arranged at equal intervals on a circumference centered on the rotation axis A1 of the wheel 20. The wheel 20 has three positioned portions 21 provided on the first surface 20a and three positioned portions 21 provided on the second surface 20b.

[0072] In this embodiment, as shown in Fig. 10, the positioned portion 21 has a positioned recess 22 that meshes with the positioning protrusion 16. In the example shown in Fig. 10, the positioned portion 21 has a positioned recess 22 that meshes with the positioning portion 14 protruding from one surface of the disk body 10. In the example shown in Fig. 10, the positioned portion 21 has a positioned recess 22 that is recessed in the rotation axis direction d2.

[0073] Fig. 11 is a diagram showing a state in which a positioned portion 21 having a positioned recess 22 is viewed from a rotation axis direction d2. The positioned recess 22 has side surfaces consisting of a pair of parallel flat surfaces 22a and a pair of curved surfaces 22b connecting the pair of flat surfaces 22a. The pair of curved surfaces 22b each have a substantially arc-shaped outline when viewed from the rotation axis direction d2 as shown in Fig. 11.

[0074] When the wheel 20 rotates a certain amount relative to the disk body 10 in the rotation direction d1 in a state where the positioning portion 14 is engaged with the positioned portion 21, the positioning portion 14 comes into contact with the positioned portion 21. This prevents the wheel 20 from rotating relative to the disk body 10 by more than a certain amount. Here, the positioning portion 14 and the positioned portion 21 may come into surface contact when the wheel 20 rotates relative to the disk body 10. As an example, the positioning portion 14 shown in Fig. 9 and the positioned portion 21 shown in Fig. 11 come into surface contact at the plane 16a and the plane 22a when the wheel 20 rotates relative to the disk body 10.

[0075] When the positioning portion 14 and the positioned portion 21 are in surface contact with each other, the contact surface between the positioning portion 14 and the positioned portion 21 has a plane that forms an angle of 75 degrees or more and 105 degrees or less with respect to the rotation direction d1 of the wheel 20.

[0076] The angle that the contact surface forms with respect to the rotation direction d1 is determined as follows. It is assumed that the positioned portion 21 shown in Fig. 11 forms a contact surface with the positioning portion 14 in the region 21a when the wheel 20 rotates relative to the disk body 10. In this case, first, an arbitrary circle C3 is drawn with the rotation axis A1 of the wheel 20 as its center. Next, a tangent line L1 to the circle C3 is drawn at the intersection P1 between the circle C3 and the contact surface. The angle θ1 between this tangent line L1 and the contact surface is determined as the angle that the contact surface forms with respect to the rotation direction d1.

[0077] The effect of the contact surface between the positioning portion 14 and the positioned portion 21 having a plane that forms an angle of 75 degrees or more and 105 degrees or less with respect to the rotation direction d1 of the wheel 20 will be described. When the brake pad applies a braking force to the disk body 10, the braking force is transmitted from the disk body 10 to the wheel 20 by the contact between the positioning portion 14 and the positioned portion 21. Here, by the contact surface satisfying the above condition, the braking force acting in the direction opposite to the rotation direction d1 of the wheel 20 can be received by the contact surface that forms an angle close to perpendicular to the direction of the braking force (an angle of 75 degrees or more and 105 degrees or less). As a result, the braking force applied to the disk body 10 can be efficiently transmitted to the wheel 20 via the contact surface between the positioning portion 14 and the positioned portion 21.

[0078] The positional relationship between the positioning portion 14 and the positioned portion 21 and the bolt through hole 40 will be described. As shown in Fig. 4, the positioning portion 14 and the positioned portion 21 are provided with the bolt through hole 40. The positioning portion 14 has a through hole 42 of the bolt through hole 40 formed therein, and the positioned portion 21 has a wheel through hole 45 formed therein. In the example shown in Fig. 4, the bolt through hole 40 passes through the tip surface 16c of the positioning protrusion 16.

[0079] Fig. 12 is a diagram showing the arrangement of the positioned portion 21 and the wheel through hole 45 when the first surface 20a side of the wheel 20 is viewed from the rotation axis direction d2. In Fig. 12, the position of the positioned portion 21 provided on the first surface 20a of the wheel 20 is indicated by a solid line, and the position of the positioned portion 21 provided on the second surface 20b of the wheel 20 is indicated by a dashed line. In a state in which the pair of disk bodies 10 are fastened to the wheel 20, the positioned portion 21 provided on the first surface 20a of the wheel 20 meshes with the positioning portion 14 formed on the first disk body 11, and the positioned portion 21 provided on the second surface 20b of the wheel 20 meshes with the positioning portion 14 formed on the second disk body 12.

[0080] 12 shows by dashed lines the positions where the first through hole 43 and the second through hole 44 of the first disk body 11 overlap with the wheel 20 when the pair of disk bodies 10 are fastened to the wheel 20. Although not shown, the position where the first through hole 43 of the first disk body 11 of the wheel 20 overlaps with the second through hole 44 of the second disk body 12. Also, the position where the second through hole 44 of the first disk body 11 of the wheel 20 overlaps with the first through hole 43 of the second disk body 12.

[0081] In Figure 12, for the convenience of illustrating and making easier to understand the arrangement of the positioned portion 21, the wheel through hole 45, the first through hole 43, and the second through hole 44, the shapes of the positioned portion 21, the wheel through hole 45, the first through hole 43, the second through hole 44, and the wheel 20 are illustrated in a simplified manner compared to Figures 3, 10, etc.

[0082] In this embodiment, as shown in FIG. 12, the positioned portion 21 provided on the first surface 20a of the wheel 20 and the positioned portion 21 provided on the second surface 20b of the wheel 20 do not overlap in the rotation axis direction d2. Therefore, in a state where the pair of disc bodies 10 are fastened to the wheel 20 to form the wheel 100 with a brake disc, the positioning portion 14 provided on one of the pair of disc bodies 10 and the positioning portion 14 provided on the other are different in the rotation axis direction d2 of the wheel 20. In other words, in the wheel 100 with a brake disc, the positioning portion 14 provided on one of the pair of disc bodies 10 and the positioning portion 14 provided on the other do not overlap in the rotation axis direction d2. In the wheel 100 with a brake disc, the position where the positioning portion 14 provided on one of the pair of disc bodies 10 meshes with the positioned portion 21 and the position where the positioning portion 14 provided on the other of the pair of disc bodies 10 meshes with the positioned portion 21 do not overlap in the rotation axis direction d2.

[0083] The effect of the positioning part 14 provided on one of the pair of disc bodies 10 and the positioning part 14 provided on the other in the wheel 100 with brake discs being different in position will be described. When the brake pad applies a braking force to the disc body 10, the braking force is transmitted from the disc body 10 to the wheel 20 through the part where the positioning part 14 meshes with the positioned part 21. Here, by the positioning part 14 provided on one of the pair of disc bodies 10 being different in position from the positioning part 14 provided on the other, the position where the braking force is transmitted from one of the pair of disc bodies 10 to the wheel 20 and the position where the braking force is transmitted from the other of the pair of disc bodies 10 to the wheel 20 can be shifted in the rotation direction d1 of the wheel 20. Therefore, the load on the wheel 20 caused by the braking force can be distributed in the rotation direction d1 of the wheel 20.

[0084] Some of the bolt through holes 40 are first bolt through holes 40a that penetrate a portion where one of the pair of disk bodies 10 has a positioning portion 14 formed therein and a portion where the other of the pair of disk bodies 10 has no positioning portion 14 formed therein. Other of the bolt through holes 40 are second bolt through holes 40b that penetrate a portion where none of the pair of disk bodies 10 has a positioning portion 14 formed therein. In FIG. 12, the position where the first bolt through hole 40a is formed when the pair of disk bodies 10 are fastened to the wheel 20 to form the wheel 100 with brake disks is denoted by the reference symbol 40a for convenience. The position where the second bolt through hole 40b is formed is denoted by the reference symbol 40b for convenience.

[0085] 2, 3 and 12, in this embodiment, the positioning portion 14 of each of the pair of disk bodies 10 is formed with a second through hole 44. That is, each of the first bolt through holes 40a includes a second through hole 44 formed in a portion of one of the pair of disk bodies 10 where the positioning portion 14 is formed, and a first through hole 43 formed in a portion of the other of the pair of disk bodies 10 where the positioning portion 14 is not formed. Each of the first through holes 43 is formed in a portion of the disk body 10 where the positioning portion 14 is not formed.

[0086] The effect of forming the second through hole 44 in the positioning portion 14 in each of the pair of disk bodies 10 will be described. In this embodiment, one and the other of the pair of disk bodies 10 have the same shape from the viewpoint of improving the productivity of the brake disk 1. On the other hand, as described above, the first through hole 43 in which the nut 32 is accommodated and the second through hole 44 in which the head 31a of the bolt 31 is accommodated are different in shape. Therefore, when fastening the pair of disk bodies 10 to the wheel 20, the first through hole 43 formed in one of the pair of disk bodies 10 and the second through hole 44 formed in the other of the pair of disk bodies 10 are overlapped, and then fastening is performed using the bolt 31 and the nut 32. If the second through holes 44 formed in one and the other of the pair of disk bodies 10 overlap each other, fastening cannot be performed using the second through hole 44. Therefore, the pair of disk bodies 10 and the wheel 20 are designed so that the second through holes 44 do not overlap each other when fastening.

[0087] Here, when the second through hole 44 is formed in the positioning portion 14 in both of the pair of disk bodies 10, the positioned portion 21 of the wheel 20 also needs to be arranged so that the second through holes 44 formed in the positioning portion 14 do not overlap. Specifically, as described above, the positioned portion 21 provided on the first surface 20a of the wheel 20 and the positioned portion 21 provided on the second surface 20b of the wheel 20 need to be arranged so that they do not overlap in the rotation axis direction d2. This makes it possible to make the positions of the positioning portion 14 provided on one of the pair of disk bodies 10 and the other of the pair of disk bodies 10 different in the wheel 100 with a brake disk formed by meshing the positioning portion 14 of the pair of disk bodies 10 with the positioned portion 21 of the wheel 20. In this way, the positions of the positioning portion 14 provided on one of the pair of disk bodies 10 and the other of the pair of disk bodies 10 in the wheel 100 with a brake disk can be made different while the shapes of one of the pair of disk bodies 10 and the other of the pair of disk bodies 10 are the same.

[0088] Furthermore, the second through holes 44 are formed in the positioning portions 14 of both of the pair of disk bodies 10, and the positioned portions 21 provided on the first surface 20a of the wheel 20 and the positioned portions 21 provided on the second surface 20b of the wheel 20 are arranged so as not to overlap in the rotation axis direction d2, thereby obtaining the following effect: When fastening the pair of disk bodies 10 to the wheel 20, fastening the positioning portions 14 of the pair of disk bodies 10 to the positioned portions 21 of the wheel 20 can prevent the second through holes 44 formed in the positioning portions 14 from overlapping each other.

[0089] 4 and 12, some of the first bolt through holes 40a include a second through hole 44 formed in a portion of the first disk body 11 where the positioning portion 14 is formed, a wheel through hole 45 formed in a portion of the wheel 20 where the positioned portion 21 is provided on the first surface 20a and the positioned portion 21 is not provided on the second surface 20b, and a first through hole 43 formed in a portion of the second disk body 12 where the positioning portion 14 is not formed. Another part of the first bolt through holes 40a includes a first through hole 43 formed in a portion of the first disk body 11 where the positioning portion 14 is not formed, a wheel through hole 45 formed in a portion of the wheel 20 where the positioned portion 21 is not provided on the first surface 20a and the positioned portion 21 is provided on the second surface 20b, and a second through hole 44 formed in a portion of the second disk body 12 where the positioning portion 14 is formed. The multiple second bolt through holes 40b consist of a first through hole 43 formed in a portion of the first disk body 11 where the positioning portion 14 is not formed, a wheel through hole 45 formed in a portion of the wheel 20 where the positioned portion 21 is not provided on either the first surface 20a or the second surface 20b, and a second through hole 44 formed in a portion of the second disk body 12 where the positioning portion 14 is not formed.

[0090] In this embodiment, as can be seen from Figure 12, the bolt through holes 40 are formed as follows: three first bolt through holes 40a including second through holes 44 formed in the portion of the first disk body 11 where the positioning portion 14 is formed, three first bolt through holes 40a including second through holes 44 formed in the portion of the second disk body 12 where the positioning portion 14 is formed, and six second bolt through holes 40b.

[0091] Here, the dashed line shown in Fig. 7 indicates the position of the positioning portion 14 provided on the inner surface 10a of the disk body 10. In the example shown in Fig. 7, the second through holes 44 formed in the portion of the disk body 10 where the positioning portion 14 is formed and the second through holes 44 formed in the portion of the disk body 10 where the positioning portion 14 is not formed are alternately formed on the circumferences C1 and C2. When the pair of disk bodies 10 are fastened to the wheel 20, as shown in Fig. 12, the first bolt through holes 40a and the second bolt through holes 40b are alternately arranged on the circumference centered on the rotation axis A1 of the wheel 20 as the bolt through holes 40.

[0092] In the example shown in FIG. 8, a through hole support portion 17 is formed on the inner surface 10a of each of the pair of disk bodies 10. The second through hole 44 and the first through hole 43, which are formed in the portion of the disk body 10 where the positioning portion 14 is formed, are each formed in the through hole support portion 17. The through hole support portion 17 has a protruding shape protruding from the inner surface. The through hole support portion 17 has the same height as the heat dissipation members 13 in the height direction of the heat dissipation members 13. When the pair of disk bodies 10 are fastened to the wheel 20, the tip surface 17a of the through hole support portion 17 contacts the wheel 20. The through hole support portion 17 has a thickness larger than that of the pin-shaped heat dissipation members 13.

[0093] The first through hole 43 and the second through hole 44 are provided in a portion of the disk body 10 where the positioning portion 14 or the through hole support portion 17 is formed, thereby making it possible to protect the shaft portion 31b of the bolt 31 passed through the bolt through hole 40. Note that the invention according to this embodiment can also be regarded as a simplification of the structure of the brake disc 1 while providing the positioning portion 14, by utilizing the base portion 15, which protects the shaft portion 31b of the bolt 31 like the through hole support portion 17, as the positioning portion 14.

[0094] A method for manufacturing a wheel 100 with a disc brake by fastening a pair of disc bodies 10 in this embodiment to the wheel 20 will be described. Fig. 13 is a diagram showing the process of fastening a pair of disc bodies 10 to the wheel 20. Fig. 13 shows the process of fastening a portion of the wheel 100 with a disc brake, which portion corresponds to the portion shown in Fig. 2.

[0095] In the fastening operation, first, as shown in FIG. 13, the pair of disk bodies 10 are overlapped on the wheel 20. At this time, the first disk body 11 is overlapped on the wheel 20 so that the positioning portion 14 formed on the first disk body 11 and the positioned portion 21 provided on the first surface 20a of the wheel 20 overlap in the rotation axis direction d2. Also, the second disk body 12 is overlapped on the wheel 20 so that the positioning portion 14 formed on the second disk body 12 and the positioned portion 21 on the second surface 20b of the wheel 20 overlap in the rotation axis direction d2. At this time, since the through hole 42 is formed in the positioning portion 14, the worker can overlap the pair of disk bodies 10 on the wheel 20 while visually checking the positioned portion 21 of the wheel 20 through the through hole 42.

[0096] Next, as shown in FIG. 14, the pair of disk bodies 10 are brought close to the wheel 20, respectively, and the positioning portion 14 is engaged with the positioned portion 21. This aligns the pair of disk bodies 10 and the wheel 20. In the aligned state, the pair of disk bodies 10 and the wheel 20 come into contact with each other in a positional relationship appropriate for fastening the pair of disk bodies 10 to the wheel 20. In the appropriate positional relationship, the first through hole 43 formed in the first disk body 11, the wheel through hole 45 formed in the wheel 20, and the second through hole 44 formed in the second disk body 12 overlap in the rotation axis direction d2 so that the bolt 31 can pass through. In addition, the second through hole 44 formed in the first disk body 11, the wheel through hole 45 formed in the wheel 20, and the first through hole 43 formed in the second disk body 12 overlap in the rotation axis direction d2 so that the bolt 31 can pass through.

[0097] Here, in this embodiment, the pair of disk bodies 10 and the wheel 20 can be aligned using the positioning portions 14 formed on the pair of disk bodies 10 and the positioned portions 21 provided on the wheel. For this reason, alignment can be performed more easily than when, for example, an alignment pin separate from the disk body 10 and the wheel 20 that meshes with the disk body 10 and the wheel 20 is prepared and alignment is performed using the alignment pin. In particular, since it is expected that the wheels 20 of the railway vehicle and the disk body 10 fastened to the wheels 20 of the railway vehicle will be large, alignment between such a large disk body 10 and a large wheel 20 can also be easily performed.

[0098] Next, the nut 32 is placed between the restricting walls 432 of the first through hole 43. Then, the bolt 31 is inserted into the bolt through hole 40 from the side where the second through hole 44 is formed. When the tip of the shaft portion 31b of the bolt 31 comes into contact with the nut 32, the bolt 31 is rotated relative to the nut 32. By the above operation, the nut 32 meshes with the shaft portion 31b of the bolt 31. As a result, as shown in Figures 1 and 2, the pair of disc bodies 10 are fastened to the wheel 20, and a wheel with brake discs 100 is manufactured.

[0099] Here, in this embodiment, a restricting wall 432 is provided in a part of the through wall 41 forming the through hole 42 (first through hole 43) to restrict the rotation of the nut 32 accompanying the rotation of the bolt 31 when fastening the pair of disk bodies 10 to the wheel 20. Therefore, by inserting the bolt 31 into the bolt through hole 40 after accommodating the nut 32 between the restricting walls 432, the fastening work can be performed without the need for an operator to fix the nut 32 by holding it by hand. In particular, since it is assumed that the wheel 20 of the railway vehicle and the disk body 10 fastened to the wheel 20 of the railway vehicle are large, the fastening work between such a large disk body 10 and the large wheel 20 can also be facilitated. For example, even in the fastening work between the large disk body 10 and the large wheel 20, when one operator inserts and rotates the bolt 31, it is not necessary for another operator to hold the nut 32. For this reason, the efficiency of the fastening work can be improved.

[0100] In this embodiment, the positioning portion 14 and the positioned portion 21 are provided with bolt through holes 40. Therefore, by fastening the pair of disk bodies 10 to the wheel 20 using the bolts 31 passed through the bolt through holes 40, the positioning portion 14 firmly meshes with the positioned portion 21. Therefore, braking force can be efficiently transmitted from the disk body 10 to the wheel 20 via the portion where the positioning portion 14 meshes with the positioned portion 21.

[0101] As described above, one embodiment has been described with reference to specific examples, but the above-mentioned specific examples are not intended to limit the embodiment. The above-mentioned embodiment can be implemented with various other specific examples, and various omissions, substitutions, and modifications can be made without departing from the spirit of the embodiment.

[0102] An example of the modification will be described below with reference to the drawings. In the following description and the drawings used in the following description, parts that can be configured similarly to the above-mentioned specific example will be designated by the same reference numerals as those used for the corresponding parts in the above-mentioned specific example, and duplicated descriptions will be omitted.

[0103] (Variation 1) In the above-mentioned embodiment, the form of the first through hole 43 has been described with reference to the forms shown in Figs. 4 and 5. However, the form of the first through hole 43 is not limited thereto. Fig. 15 is a cross-sectional view showing an enlarged view of the periphery of the first through hole 43 in a cross section of the disk body 10 in which the first through hole 43 having the nut accommodating wall 433 of the first modification example is formed, cut along a plane parallel to the extension direction of the first through hole 43. In Fig. 15, the fastening member 30 disposed inside the first through hole 43 is shown as viewed in a plan view from a direction perpendicular to the cross section.

[0104] 15, the hole diameter w10 of the first through hole 43 on the contact surface 10b of the disk body 10 is smaller than the hole diameter w11 of the first through hole 43 at a portion where the nut accommodating wall 433 is formed. Here, the portion where the nut accommodating wall 433 is formed is a portion of the through wall 41 with which the nut 32 contacts when the pair of disk bodies 10 are fastened to the wheel 20.

[0105] By applying force to the nut 32 to push it into the first through hole 43, the nut 32 can be accommodated between the nut accommodating walls 433 of the first through hole 43 shown in Fig. 15. In the example shown in Fig. 15, the hole diameter w10 at the opening of the first through hole 43 on the contact surface 10b side is smaller than the hole diameter w11 at the portion of the first through hole 43 where the nut accommodating wall 433 that contacts the nut 32 is formed. Therefore, when the shaft portion 31b of the bolt 31 is engaged with the nut 32 accommodated between the nut accommodating walls 433, the nut 32 can be prevented from being pushed by the bolt 31 and falling off the first through hole 43.

[0106] (Variation 2) In the above-mentioned embodiment and modified example, the form of the first through hole 43 has been described with reference to the forms shown in FIG. 4, FIG. 5, and FIG. 15. However, the form of the first through hole 43 is not limited to this. The form of the first through hole 43 is not limited to the illustrated example, and a form having a restricting wall 432 capable of restricting the rotation of the nut 32 can be widely adopted. FIG. 16 is a cross-sectional view showing an enlarged view of the periphery of the first through hole 43 in a cross section of the disk body 10 in which the first through hole 43 of modified example 2 is formed, cut along a plane parallel to the extension direction of the first through hole 43. FIG. 16 also shows a plan view of the nut 32 arranged inside the first through hole 43, viewed from a direction perpendicular to the cross section.

[0107] 16, the hole diameter w12 of the first through hole 43 at the portion where the restricting wall 432 is formed is smaller than the dimension w13 of the nut 32 in the direction perpendicular to the extension direction of the bolt 31 with which the nut 32 engages. In this case, the nut 32 can be accommodated between the restricting walls 432 by applying force to the nut 32 to push it between the restricting walls 432. Then, because the nut 32 is sandwiched between the restricting walls 432, the rotation of the nut 32 is restricted.

[0108] As an example, the nut 32 has a cylindrical shape with a hole that meshes with the shaft portion 31b of the bolt 31. The portion of the first through hole 43 where the restricting wall 432 is formed is a circular hole. The portion of the first through hole 43 where the restricting wall 432 is formed is formed so that its hole diameter w12 is smaller than the diameter w13 of the cylindrical nut 32.

[0109] (Variation 3) In the above-described embodiment and each modified example, an example has been shown in which the positioning portion 14 protrudes in the height direction of the heat dissipation member 13 beyond the multiple heat dissipation members 13, and the positioned portion 21 has a positioned recess 22 that meshes with the protruding positioning portion 14. However, the form of the positioning portion 14 and the positioned portion 21 is not limited to this. The shape of the positioning portion 14 and the positioned portion 21 is not particularly limited as long as, for example, one of the positioning portion 14 and the positioned portion 21 has a convex shape and the other has a concave shape, and the one having the convex shape and the other having the concave shape can mesh with each other.

[0110] Figure 17 is a cross-sectional view showing an enlarged view of the area around the positioning portion 14 and the positioned portion 21 in a cross section of a disk body 10 in which a positioning portion 14 is formed and a wheel 20 in which a positioned portion 21 is provided, cut in a plane parallel to the extension direction of the bolt through hole 40 in variant example 3.

[0111] In the example shown in FIG. 17, the positioning portion 14 is located closer to the root portion 13b of the heat dissipating member 13 than the tip 13a of the heat dissipating member 13 in the height direction of the heat dissipating member 13. In the example shown in FIG. 17, the positioning portion 14 has a positioning surface 14c. The positioning surface 14c is located closer to the root portion 13b of the heat dissipating member 13 than the tip 13a of the heat dissipating member 13 in the height direction of the heat dissipating member 13, and faces the wheel 20. In particular, the positioning portion 14 has a base 15 having the same height as the heat dissipating member 13 in the height direction of the heat dissipating member 13, and a positioning recess 18 formed on the tip surface 15a of the base 15. In this case, the bottom surface of the positioning recess 18 is the positioning surface 14c. In the example shown in FIG. 17, the bolt through hole 40 passes through the positioning surface 14c. Also, in the example shown in FIG. 17, the positioned portion 21 has a positioned protrusion 23 that engages with the positioning portion 14 having the positioning surface 14c. 17, the positioning portion 14 has a concave shape at the positioning recess 18. Moreover, the positioned portion 21 has a convex shape at the positioned protrusion 23. In the example shown in FIG. 17, the positioned protrusion 23 meshes with the positioning recess 18.

[0112] In addition, from the viewpoint of preventing the positioned portion 21 having a convex shape from accidentally meshing between the plurality of heat dissipation members 13 when aligning the pair of disk bodies 10 and the wheels 20, it is preferable that the positioned portion 21 has a concave shape rather than a convex shape. From the above viewpoint, it is preferable that the positioning portion 14 protrudes further than the plurality of heat dissipation members 13 in the height direction of the heat dissipation members 13, and that the positioned portion 21 has a positioned recess 22.

[0113] (Variation 4) In the above-mentioned embodiment and each modified example, the forms of the positioning portion 14 and the positioned portion 21 have been described with reference to the forms shown in Fig. 4, Fig. 9, Fig. 10, and Fig. 17. However, the forms of the positioning portion 14 and the positioned portion 21 are not limited to these. Fig. 18 is a cross-sectional view showing an enlarged view of the periphery of the positioning portion 14 and the positioned portion 21 in a cross section of the disk body 10 on which the positioning portion 14 is formed and the wheel 20 on which the positioned portion 21 is provided in modified example 4, taken along a plane parallel to the extending direction of the bolt through hole 40.

[0114] In the fourth modification, at least one of the positioning portion 14 and the positioned portion 21 has an inclined surface 14b, 21b inclined along the insertion direction of the bolt 31. In the example shown in Fig. 18, the insertion direction of the bolt 31 is the same as the extension direction of the bolt through hole 40, and therefore the same as the rotational axis direction d2. The positioning portion 14 has an inclined surface 14b inclined with respect to the rotational axis direction d2. The positioned portion 21 has an inclined surface 21b inclined with respect to the rotational axis direction d2.

[0115] Here, one of the positioning part 14 and the positioned part 21, which has a convex shape, has an inclined surface that is inclined so that the convex shape becomes narrower toward the tip end side of the convex shape. Also, the other of the positioning part 14 and the positioned part 21, which has a concave shape, has an inclined surface that is inclined so that the concave shape becomes narrower toward the bottom side of the concave shape. In the example shown in FIG. 18, the positioning part 14 has a base part 15 and a positioning protrusion 16, and the positioning protrusion 16 has a convex shape. The side surface of the positioning protrusion 16 is an inclined surface 14b that is inclined so that the positioning protrusion 16 becomes narrower toward the tip surface 16c side. Also, in the example shown in FIG. 18, the positioned part 21 has a positioned recess 22, and the positioned recess 22 has a concave shape. The side surface of the positioned recess 22 is an inclined surface 21b that is inclined so that the positioned recess 22 becomes narrower toward the bottom side.

[0116] At least one of the positioning portion 14 and the positioned portion 21 has the inclined surfaces 14b, 21b, so that the positioning portion 14 can be engaged with the positioned portion 21 along the inclined surfaces 14b, 21b. This makes it easy to engage the positioning portion 14 with the positioned portion 21. In particular, it makes it easy to insert the tip of one of the positioning portion 14 and the positioned portion 21 that has a convex shape into the other that has a concave shape.

[0117] (Variation 5) In the above-mentioned embodiment and each modification, the positioning portion 14 of the pair of disk bodies 10 has the second through hole 44 formed as the through hole 42. However, the positional relationship between the positioning portion 14 and the through hole 42 is not limited to this. FIG. 19 is a diagram showing the positional relationship between the positioning portion 14 and the through hole 42 in the pair of disk bodies 10 of modification 5. Note that FIG. 19 shows the pair of disk bodies 10 as viewed from the contact surface 10b side. Also, in FIG. 19, for the convenience of illustrating and understanding the arrangement of the first through hole 43 and the second through hole 44, the shapes of the first through hole 43, the second through hole 44, and the pair of disk bodies 10 are illustrated in a simplified manner similar to FIG. 7. Also, the dashed line shown in FIG. 19 indicates the position of the positioning portion 14 provided on the inner surface 10a of the disk body 10.

[0118] 19, a first through hole 43 is formed in the positioning portion 14 in both of the pair of disk bodies 10. In this case, too, it is possible to obtain the same effect as that obtained in the case where the second through hole 44 is formed in the positioning portion 14 in both of the pair of disk bodies 10, as described in the above embodiment. Note that, the description of the arrangement of the second through hole 44 in the case where the second through hole 44 is formed in the positioning portion 14 described in the above embodiment also applies, unless there is a contradiction, to the description of the arrangement of the first through hole 43 in the case where the first through hole 43 is formed in the positioning portion 14. Furthermore, the description of the arrangement of the first through hole 43 in the case where the second through hole 44 is formed in the positioning portion 14 described in the above embodiment also applies, unless there is a contradiction, to the description of the arrangement of the second through hole 44 in the case where the first through hole 43 is formed in the positioning portion 14.

[0119] (Variation 6) In the above-described embodiment and each modified example, a description has been given of an example in which a plurality of first through holes 43 and a plurality of second through holes 44 are formed in one of a pair of disk bodies 10, and a plurality of first through holes 43 and a plurality of second through holes 44 are also formed in the other of the pair of disk bodies 10. However, the arrangement of the first through holes 43 and the second through holes 44 is not limited to this. Fig. 20 is a diagram showing the arrangement of the first through holes and the second through holes in the pair of disk bodies 10 of the sixth modified example. Fig. 20 shows the pair of disk bodies 10 as viewed from the contact surface 10b side. In Fig. 20, for the convenience of illustrating and facilitating understanding of the arrangement of the first through holes 43 and the second through holes 44, the shapes of the first through holes 43, the second through holes 44 and the pair of disk bodies 10 are shown in a simplified manner similar to Figs. 7 and 19. The dashed line shown in Fig. 20 indicates the position of the positioning portion 14 provided on the inner surface 10a of the disk body 10.

[0120] In the example shown in Fig. 20, one of the pair of disk bodies 10 has only a plurality of first through holes 43 formed as the through holes 42. The other of the pair of disk bodies 10 has only a plurality of second through holes 44 formed as the through holes 42. That is, the one of the pair of disk bodies 10 does not have the second through hole 44 formed therein, and the other of the pair of disk bodies 10 does not have the first through hole 43 formed therein. Even in this case, the first through hole 43 formed in one of the pair of disk bodies 10 and the second through hole 44 formed in the other of the pair of disk bodies 10 can be overlapped in the rotation axis direction d2 to form the bolt through hole 40.

[0121] When the pair of disk bodies 10 shown in FIG. 20 is fastened to the wheel 20, the fastening work can be performed in the following procedure. First, nuts 32 are placed in all the through holes 42 (first through holes 43) of one of the pair of disk bodies 10. Next, bolts 31 are inserted from all the through holes 42 (second through holes 44) of the other of the pair of disk bodies 10, and the nuts 32 are engaged with the shaft portions 31b of the bolts 31. In this way, the pair of disk bodies 10 shown in FIG. 20 has a simpler and easier to understand fastening work procedure than, for example, the pair of disk bodies 10 shown in FIG. 7.

[0122] Among the embodiments disclosed in this specification, those that are composed of multiple objects may be integrated, and conversely, those that are composed of one object may be divided into multiple objects. Regardless of whether they are integrated or not, it is sufficient that they are configured to achieve the object of the invention.

[0123] The aspects of the present invention are not limited to the above-mentioned individual embodiments, but include various modifications that may be conceived by a person skilled in the art, and the effects of the present invention are not limited to the above-mentioned contents. In other words, various additions, modifications, and partial deletions are possible within the scope of the conceptual idea and intent of the present invention derived from the contents defined in the claims and their equivalents. [Explanation of symbols]

[0124] 1 Brake disc 10 Disc body 10a Inner surface 10b Contact surface 13 Heat dissipation materials 14 Positioning part 14b Slope 14c Positioning surface 15 base 16 Positioning protrusion 17 Through-hole support part 18 Positioning recess 20 wheels 21 Positioned part 21b Slope 22 Positioned recess 23 Positioned protrusion 30 Fastening members 31 Volts 31a head 31b Shaft 32 Nut 40 Bolt Through Holes 41 Through Wall 411 Shaft housing wall 42 Through hole 43 First Through Hole 432 Regulatory Wall 433 Nut Receiving Wall 44 Second Through Hole 442 Bolt Storage Wall 45 Wheel through hole 100 Wheels with brake discs

Claims

1. a pair of disk bodies that sandwich a wheel of a railway vehicle and have through walls that form through holes in contact surfaces that come into contact with brake pads to brake the rotation of the wheel; The pair of disk bodies can be fastened to sandwich the wheel by fastening members including bolts and nuts, the through-wall provided on one of the pair of disk bodies has a restricting wall provided in a part thereof for restricting rotation of the nut accompanying rotation of the bolt when the pair of disk bodies is fastened to the wheel, thereby forming a first through-hole; The through-wall provided on the other of the pair of disk bodies forms a second through-hole, When viewed from a direction of a rotation axis of the wheel, a shape of the first through hole and a shape of the second through hole are different from each other. Brake disc.

2. a pair of disk bodies that sandwich a wheel of a railway vehicle and have through walls that form through holes in contact surfaces that come into contact with brake pads to brake the rotation of the wheel; The pair of disk bodies can be fastened to sandwich the wheel by fastening members including bolts and nuts, the through-wall provided on one of the pair of disk bodies has a restricting wall provided in a part thereof for restricting rotation of the nut accompanying rotation of the bolt when the pair of disk bodies is fastened to the wheel, thereby forming a first through-hole; The restriction wall forms a nut accommodating wall that accommodates the nut so as to be in surface contact with a side surface of the nut, A hole diameter of the first through hole on the contact surface is smaller than a hole diameter of the first through hole at a portion where the nut accommodating wall is formed. Brake disc.

3. The through wall provided on the other of the pair of disk bodies, in which the regulating wall is not provided, is provided in a portion thereof with a bolt accommodating wall for rotatably accommodating the head of the bolt, thereby forming a second through hole. A brake disc according to claim 2.

4. The nut has a polygonal prism shape, The restriction wall is in surface contact with at least one of the side surfaces of the polygonal prism-shaped nut. A brake disc according to claim 3.

5. The through wall further includes a shank accommodating wall that accommodates a shank of the bolt, The nut accommodating wall and the shaft portion accommodating wall are formed continuously so that the nut accommodating wall is located on the contact surface side. A brake disc according to claim 3 or 4.

6. the restriction wall is provided in the first through hole at a position farther from the contact surface than a maximum wear amount, which is a maximum amount that each of the pair of disk bodies can wear down. A brake disc according to any one of claims 1, 3, 4 and 5.

7. When viewed from a direction of a rotation axis of the wheel, a shape of the first through hole and a shape of the second through hole are different from each other. A brake disc according to any one of claims 1, 3, 4, 5 and 6.

8. a plurality of the first through holes and a plurality of the second through holes are formed in one of the pair of disk bodies, A plurality of the first through holes and a plurality of the second through holes are formed in the other of the pair of disk bodies. A brake disc according to any one of claims 1, 3, 4, 5, 6 and 7.

9. the number of the first through holes formed in one of the pair of disk bodies is equal to the number of the first through holes formed in the other of the pair of disk bodies, The number of the second through holes formed in one of the pair of disk bodies is equal to the number of the second through holes formed in the other of the pair of disk bodies. A brake disc according to claim 8.

10. an arrangement of the first through holes formed in one of the pair of disk bodies in the disk body is the same as an arrangement of the first through holes formed in the other of the pair of disk bodies in the disk body; an arrangement of the second through holes formed in one of the pair of disk bodies in the disk body is the same as an arrangement of the second through holes formed in the other of the pair of disk bodies in the disk body; A brake disc according to claim 9.

11. the first through hole and the second through hole are provided in one of the pair of disk bodies in a rotationally symmetric arrangement as viewed from a rotation axis direction of the wheel, 11. The brake disc according to claim 8, wherein the first through hole and the second through hole are provided in the other of the pair of disc bodies in a rotationally symmetric arrangement as viewed from the rotation axis direction of the wheel.

12. the through holes are arranged on one of the pair of disk bodies at equal intervals on a circumference centered on a rotation axis of the wheel, and the first through holes and the second through holes are arranged alternately; the through holes are arranged on the other of the pair of disk bodies at equal intervals on a circumference centered on the rotation axis of the wheel, and the first through holes and the second through holes are arranged alternately. A brake disc according to claim 11.

13. one of the pair of disk bodies is formed with only the first through holes as the through holes, In the other of the pair of disk bodies, only the second through holes are formed as the through holes. A brake disc according to any one of claims 1, 3, 4, 5, 6 and 7.

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