Ventilated brake disc and method for manufacturing ventilated brake disc

Abstract

To provide a ventilated brake disk and a manufacturing method of the ventilated brake disk capable of reducing manufacturing cost by dispensing with a heating process for joining a disk and a support part of a body.SOLUTION: The disc brake comprises two discs 1, 2 opposed to each other, a central 3a part mountable on a vehicular axle, and a plurality of radially extending parts radially extending from the central 3a part. And a main body 3 having a support portion side 3b that supports the two disks 1 and 2 while separating the two disks 1 and 2 from each other by a predetermined distance, wherein a plurality of hole portions H1 to H3 formed in one of the disks 1 and 2 and the support portion side 3b of the main body 3, and a plurality of convex portions T1 and T2 formed in the other of the disks 1 and 2 and the support portion side 3b of the main body 3 are provided, and the disks 1 and 2 and the support portion 3b are formed by caulking and joining the convex portions H1 and inserted into the hole portions to. H3 T1 T2.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a ventilated brake disc having two discs supported at a predetermined distance from each other, and a method for manufacturing the same. [Background technology]

[0002] An example of a braking means provided on vehicles such as passenger cars and motorcycles is a ventilated brake disc configured by interposing multiple fins (supporting portions) radially between two opposing discs, as disclosed in Patent Document 1. The ventilated brake disc is attached to the vehicle so that it can rotate integrally with the wheels, and braking force is obtained by pressing brake pads against the disc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-164828 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when manufacturing the above-described ventilated brake discs, it was necessary to interpose copper foil or the like between each of the two discs and the supporting portion, and then to braze the discs and the supporting portion by heating them in a vacuum furnace. This required a relatively expensive vacuum furnace, and a cooling time in addition to the heating time, which lengthened the lead time and increased the manufacturing cost.

[0005] The present invention has been made in view of the above circumstances, and aims to provide a ventilated brake disc and a method for manufacturing a ventilated brake disc, which can reduce manufacturing costs by eliminating the need for a heating process for joining the disc and the support part of the main body. [Means for solving the problem]

[0006] The invention described in claim 1 is a ventilated brake disc comprising two discs facing each other, a central portion that can be attached to a vehicle axle, and a main body having a plurality of support portions extending radially from the central portion and supporting the two discs while keeping them spaced apart by a predetermined distance, wherein the brake disc has a plurality of holes formed in one of the discs and the support portions of the main body, and a plurality of protrusions formed in the other of the discs and the support portions of the main body, and the discs and the support portions are joined by crimping the protrusions inserted into the holes.

[0007] The invention of claim 2 is characterized in that, in the ventilated brake disc of claim 1, the hole portion is a through-hole with a tapered inner surface, the diameter of the second opening on the opposite side is larger than the diameter of the first opening on the insertion side of the convex portion, and the tip of the convex portion inserted from the first opening is plastically deformed in the radial direction and crimped.

[0008] The invention of claim 3 is characterized in that the hole is formed in the disk, and the protrusion is formed in the support portion of the main body.

[0009] The invention described in claim 4 is characterized in that, in the ventilated brake disc described in claim 3, the convex portions are formed in multiple radial directions on the support portion, and are formed to protrude alternately on the front and back surfaces of the support portion along the radial direction.

[0010] The invention of claim 5 is characterized in that, in the ventilated brake disc of claim 1, the hole portion is formed in the support portion of the main body, and the protrusion portion is formed in the disc.

[0011] The invention described in claim 6 is characterized in that, in the ventilated brake disc described in claim 5, the convex portions are formed in multiple radial directions on the disc and are alternately fitted into the support portion from the front and back surfaces across the radial direction.

[0012] The invention described in claim 7 is a method for manufacturing a ventilated brake disc comprising two discs facing each other, a central portion that can be attached to an axle of a vehicle, and a main body having a plurality of support portions that extend radially from the central portion and support the two discs while maintaining a predetermined distance apart, characterized by comprising an insertion step of inserting a plurality of protrusions formed on one of the discs and the support portion of the main body into a plurality of hole portions formed on the other of the discs and the support portion of the main body, and a crimping step of crimping and joining the discs and the support portions by applying pressure to and deforming the protrusions inserted into the hole portions in the insertion step.

[0013] The invention of claim 8 is characterized in that, in the method for manufacturing a ventilated brake disc of claim 7, the hole portion is a through-hole having a tapered inner peripheral surface, and a second opening on the opposite side is formed with a larger diameter than a first opening on the insertion side of the convex portion, and the crimping step crimps the convex portion inserted from the first opening by inserting a crimping tool through the second opening and applying pressure to the tip of the convex portion to plastically deform it in the radial direction.

[0014] The invention of claim 9 is characterized in that, in the manufacturing method of a ventilated brake disc of claim 7, the hole portion is formed in the disc and the protrusion portion is formed in the support portion of the main body.

[0015] The invention of claim 10 is characterized in that, in the manufacturing method of a ventilated brake disc of claim 9, the convex portions are formed in multiple radial directions on the support portion, and are formed to protrude alternately on the front and back surfaces of the support portion along the radial direction.

[0016] The invention of claim 11 is characterized in that, in the manufacturing method of a ventilated brake disc of claim 7, the hole portion is formed in the support portion of the main body, and the protrusion portion is formed in the disc.

[0017] The invention of claim 12 is characterized in that, in the manufacturing method of a ventilated brake disc of claim 11, the convex portions are formed in multiple radial directions on the disc and are alternately fitted into the support portion from the front and back surfaces across the radial direction. [Effects of the Invention]

[0018] According to the inventions of claims 1 and 7, the disc and the support part are integrated by crimping the convex part inserted into the hole part, thereby eliminating the need for a heating process to join the disc and the support part of the main body, thereby reducing manufacturing costs.

[0019] According to the inventions of claims 2 and 8, the hole portion has a tapered inner surface as a through hole, and the second opening on the opposite side has a larger diameter than the first opening on the insertion side of the convex portion, and the tip of the convex portion inserted through the first opening is plastically deformed in the radial direction to be crimped and joined, thereby enabling good and reliable crimping joining using a crimping tool.

[0020] According to the inventions of claims 3 and 9, the hole portion is formed in the disc and the convex portion is formed in the support portion of the main body, so that the convex portion of the support portion can be crimped and joined to the hole portion of the disc, thereby ensuring a secure joining of the disc and the support portion.

[0021] According to the inventions of claims 4 and 10, the protrusions are formed in multiple radial directions on the support portion, and are formed to protrude alternately on the front and back surfaces of the support portion in the radial direction, thereby improving the radial bonding force between the disc and the support portion and reliably maintaining the bond between the disc and the main body.

[0022] According to the inventions of claims 5 and 11, the hole portion is formed in the support portion of the main body, and the convex portion is formed in the disc, so that the convex portion of the disc can be crimped and joined to the hole portion of the support portion, thereby ensuring a secure joining of the disc and the support portion.

[0023] According to the inventions of claims 6 and 12, multiple convex portions are formed radially on the disk and are alternately inserted from the front and back surfaces of the support portion along the radial direction, thereby improving the radial joining force between the disk and the support portion and reliably maintaining the joining between the disk and the main body. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a perspective view showing a ventilated brake disc according to a first embodiment of the present invention; [Figure 2] Three-view drawing showing the same ventilated brake disc [Figure 3] Cross section of line III-III in Figure 2 [Figure 4] FIG. 2 is an exploded perspective view showing the ventilated brake disc. [Figure 5] FIG. 2 is an exploded perspective view showing the ventilated brake disc. [Figure 6] FIG. 2 is a perspective view showing the main body of the ventilated brake disc. [Figure 7] FIG. 1 is a cross-sectional view showing the overall state of the ventilated brake disc after the insertion process (before the crimping process) in the manufacturing method thereof. [Figure 8] FIG. 10 is a cross-sectional view showing the state of the protrusions and holes before the insertion step in the manufacturing method of the ventilated brake disc. [Figure 9] FIG. 1 is a cross-sectional view showing the state of the protrusions and holes after the insertion step (before the crimping step) in the manufacturing method of the ventilated brake disc. [Figure 10] FIG. 10 is a cross-sectional view showing the state of the protrusions and holes after the crimping step in the manufacturing method of the ventilated brake disc. [Figure 11]3A and 3B are three-view diagrams showing a ventilated brake disc according to a second embodiment of the present invention; [Figure 12] Cross section of line XII-XII in Figure 11 [Figure 13] FIG. 2 is an exploded perspective view showing the ventilated brake disc. [Figure 14] FIG. 2 is an exploded perspective view showing the ventilated brake disc. [Figure 15] FIG. 2 is a perspective view showing the disc of the ventilated brake disc. [Figure 16] FIG. 1 is a cross-sectional view showing the overall state of the ventilated brake disc after the insertion process (before the crimping process) in the manufacturing method thereof. [Figure 17] FIG. 10 is a cross-sectional view showing the state of the protrusions and holes before the insertion step in the manufacturing method of the ventilated brake disc. [Figure 18] FIG. 1 is a cross-sectional view showing the state of the protrusions and holes after the insertion step (before the crimping step) in the manufacturing method of the ventilated brake disc. [Figure 19] FIG. 10 is a cross-sectional view showing the state of the protrusions and holes after the crimping step in the manufacturing method of the ventilated brake disc. [Figure 20] A table showing the materials and dimensions of the test specimens used in the ventilated brake disc experiment. [Figure 21] Graph showing a comparison of peel strength, which is the experimental result of the same ventilated brake disc [Figure 22] Graph showing the comparison of tensile loads as experimental results for the same ventilated brake disc [Figure 23] Graph showing a comparison of compressive loads as experimental results for the same ventilated brake disc DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. The ventilated brake disc according to the first embodiment has a main body attached to the axle of a vehicle such as an automobile or motorcycle so that it can rotate integrally with the axle, and brake pads are pressed against the discs to generate braking force for the vehicle. As shown in Figures 1 to 3, the main body 3 is made of an annular member with an opening in the center, and is equipped with two discs (a first disc 1 and a second disc 2) facing each other, a central portion 3a that can be attached to the axle of the vehicle, and multiple support portions 3b that extend radially from the central portion 3a and support the two discs 1 and 2 while keeping them a predetermined distance apart.

[0026] As shown in Figures 4 and 5, the first disc 1 and the second disc 2 are made of annular metal members each having an opening 1a, 2a in the center, and as shown in Figures 1 to 3, each of the two discs (first disc 1 and second disc 2) is supported by being crimped to a support portion 3b. When the ventilated brake disc is attached to the axle of the vehicle, the first disc 1 and second disc 2 are disposed in close proximity to brake pads (not shown), and when the driver applies the brakes, the brake pads press against the first disc 1 and second disc 2, generating braking force.

[0027] 1 to 6, the main body 3 is made of a metal member in which a central portion 3a and support portions 3b are integrally formed, and is configured such that a plurality of support portions 3b are formed to protrude at equal intervals around the circumferential direction of the central portion 3a, which is attached to the axle of a vehicle. The central portion 3a according to this embodiment is made of a cylindrical portion and has a central hole 3aa that opens wide in the center, and a plurality of mounting holes 3ab formed on the outer periphery of the central hole 3aa, through which bolts (not shown) attached to the axle can be inserted.

[0028] The support portions 3b are provided in a plurality of radially extending configurations from the central portion 3a, and support two disks (first disk 1 and second disk 2) while keeping them spaced apart by a predetermined distance, and are each formed of a rectangular portion integrally extending from the periphery of the central portion 3a, as shown in Figures 4 to 6. In addition, the support portion 3b according to this embodiment has the first disk 1 crimped to one surface and the second disk 2 crimped to the other surface.

[0029] After the ventilated brake disc is attached to the vehicle axle by inserting bolts through the mounting holes 3ab, when the vehicle travels and the wheels rotate, air flows from the inside to the outside between the circumferentially adjacent support portions 3b, and the support portions 3b function as fins to provide a cooling effect for the first disc 1 and the second disc 2. In this way, air flows between the two discs (first disc 1 and second disc 2) while the vehicle is traveling, thereby maintaining braking performance.

[0030] As shown in Figures 3 to 6, the ventilated brake disc according to this embodiment has a plurality of holes H1, H2 formed in the first disc 1 and the second disc 2, and a plurality of protrusions T1, T2 formed in the support portion 3b of the main body 3, and the first disc 1, the second disc 2 and the support portion 3b are integrated at a crimped joint K obtained by crimping the protrusions T1, T2 inserted into the holes H1, H2.

[0031] Specifically, hole H1 is formed over substantially the entire area of ​​first disk 1, and as shown in Fig. 8, the inner peripheral surface is a tapered through-hole, and the diameter of the second opening A2 on the opposite side is larger than the first opening A1 on the insertion side of protrusions T1 and T2. Similarly, hole H2 is formed over substantially the entire area of ​​second disk 2, and as shown in Fig. 8, the inner peripheral surface is a tapered through-hole, and the diameter of the second opening A2 on the opposite side is larger than the first opening A1 on the insertion side of protrusions T1 and T2.

[0032] 6, the protrusions T1 and T2 according to this embodiment are formed on the support portion 3b of the main body 3, with the protrusion T1 protruding from one surface of the support portion 3b (the surface to which the first disc 1 is joined) and the protrusion T2 protruding from the other surface (the surface to which the second disc 2 is joined). Furthermore, a plurality of the protrusions T1 and T2 according to this embodiment are formed in the radial direction (the extension direction of the support portion 3b) of the support portion 3b, and are protruding alternately from the front surface (the surface to which the first disc 1 is joined) and the back surface (the surface to which the second disc 2 is joined) of the support portion 3b across the radial direction.

[0033] 7, 9, and 10, in the ventilated brake disc according to this embodiment, the protruding ends of the protrusions T1 and T2 that fit through the first opening A1 are plastically deformed in the radial direction to form crimped joints K. As shown in Fig. 7, these crimped joints K are alternately formed on the front and back surfaces in the radial direction of the support portion 3b, and as shown in Fig. 10, they are plastically deformed toward the tapered shapes of the holes H1 and H2, thereby enabling strong prevention of dislodgment.

[0034] Next, a method for manufacturing the ventilated brake disc according to the first embodiment will be described. By fitting the first disk 1 to the front side of the support portion 3b of the main body 3 and fitting the second disk 2 to the back side, the multiple protrusions T1, T2 formed on the support portion 3b of the main body 3 are inserted into the multiple holes H1, H2 formed in the first disk 1 and the second disk 2, as shown in Figures 7 and 9 (insertion process).The diameter dimension t of the protrusions T1, T2 is slightly smaller than the dimension of the first openings A1 of the holes H1, H2, and the protrusion dimension h of the protrusions T1, T2 is a dimension that does not reach the second openings A2 of the holes H1, H2.

[0035] Thereafter, the protrusions T1 and T2 inserted into the holes H1 and H2 in the insertion step are pressurized and deformed to crimp and join the first disk 1 and the second disk 2 to the support portion 3b (crimping and joining step). In this crimping and joining step, as shown in Figures 9 and 10, a crimping tool L is inserted through the second opening A2 into the protrusions T1 and T2 inserted through the first opening A1, and pressure is applied to the tips of the protrusions T1 and T2 to plastically deform them in the radial direction, thereby forming a crimped joint K. In the insertion step and the crimping and joining step, the support portion 3b is positioned and fixed by the lower mold D, as shown in Figures 9 and 10.

[0036] According to this embodiment, the disks (first disk 1 and second disk 2) and the support portion 3b are integrated by crimping the protrusions T1 and T2 inserted into the holes H1 and H2, thereby eliminating the need for a heating process to join the disks (first disk 1 and second disk 2) and the support portion 3b of the main body 3, thereby reducing manufacturing costs.

[0037] In addition, the hole portions H1 and H2 in this embodiment have a tapered inner surface as a through hole, and the second opening A2 on the opposite side has a larger diameter than the first opening A1 on the insertion side of the convex portions T1 and T2.The tips of the convex portions T1 and T2 inserted through the first opening A1 are plastically deformed in the radial direction to be crimped and joined, so that crimping joining using the crimping tool L can be performed well and reliably.

[0038] Furthermore, the holes H1 and H2 in this embodiment are formed in the first disk 1 and the second disk 2, and the protrusions T1 and T2 are formed in the support portion 3b of the main body 3, so that the protrusions T1 and T2 of the support portion 3b can be crimped and joined to the holes H1 and H2 of the disks (first disk 1 and second disk 2), thereby ensuring a secure joining between the disks (first disk 1 and second disk 2) and the support portion 3b.

[0039] Furthermore, the protrusions T1 and T2 in this embodiment are formed in multiple radial directions on the support portion 3b, and are alternately protruded on the front surface (the joining surface of the first disk 1) and the back surface (the joining surface of the second disk 2) of the support portion 3b in the radial direction, thereby improving the radial joining force between the disks (first disk 1 and second disk 2) and the support portion 3b, and reliably maintaining the joining between the disks (first disk 1 and second disk 2) and the main body 3.

[0040] Next, a ventilated brake disc according to a second embodiment of the present invention will be described. The ventilated brake disc according to this embodiment, like the first embodiment, has a main body attached to the axle of a vehicle such as an automobile or motorcycle so as to be rotatable integrally with the axle, and brake pads are pressed against the discs to generate braking force for the vehicle. As shown in Figures 11 to 15, the main body 3 is made of an annular member with an opening in the center, and includes two discs (first disc 1 and second disc 2) facing each other, a central portion 3a that can be attached to the axle of the vehicle, and a plurality of support portions 3b extending radially from the central portion 3a and supporting the two discs 1 and 2 while keeping them spaced apart by a predetermined distance. Note that the same reference numerals are used to designate the same parts as those in the first embodiment, and detailed descriptions thereof will be omitted.

[0041] As shown in Figures 13 and 14, the first disk 1 and the second disk 2 are made of annular metal members each having an opening 1a, 2a in the center, and as shown in Figures 11 and 12, each of the two disks (first disk 1 and second disk 2) is supported by being crimped to a support portion 3b. As shown in Figures 11 and 12, the main body 3 is made of a metal member in which the central portion 3a and the support portions 3b are integrally formed, and is configured such that a plurality of support portions 3b protrude and are formed at equal intervals around the circumferential direction of the central portion 3a which is attached to the axle of the vehicle.

[0042] The support portions 3b are provided in a plurality of radially extending configurations from the central portion 3a, and support two disks (first disk 1 and second disk 2) while keeping them spaced a predetermined distance apart, and are each formed of a rectangular portion integrally extending from the periphery of the central portion 3a, as shown in Figures 13 and 14. In addition, the support portion 3b according to this embodiment has the first disk 1 crimped to one surface and the second disk 2 crimped to the other surface.

[0043] Here, as shown in Figures 12 to 15, the ventilated brake disc of this embodiment has a plurality of holes H3 formed in the support portion 3b of the main body 3 and a plurality of protrusions T1, T2 formed on the first disc 1 and the second disc 2, and the first disc 1, the second disc 2 and the support portion 3b are integrated at a crimp joint K obtained by crimping the protrusions T1, T2 inserted into the hole H3.

[0044] Specifically, a plurality of holes H3 are formed in the support portion 3b, and as shown in Fig. 17, the inner peripheral surface is a tapered through hole, and the diameter of the second opening A2 on the opposite side is larger than the first opening A1 on the insertion side of the protrusions T1 and T2. Furthermore, the protrusions T1 and T2 according to this embodiment are formed on the first disk 1 and the second disk 2, respectively, and as shown in Fig. 15, the protrusion T1 is formed on the surface of the first disk 1 (the surface to which the support portion 3b is joined) and the protrusion T2 is formed on the surface of the second disk 2 (the surface to which the support portion 3b is joined).

[0045] Furthermore, the protrusions T1, T2 according to this embodiment are formed in multiple radial directions (extension directions of the support portion 3b) on the first disk 1 and the second disk 2, and are alternately fitted into the support portion 3b from the front surface (the joining surface with the first disk 1) and the back surface (the joining surface with the second disk 2) along the radial direction. Note that the first disk 1 and the second disk 2 according to this embodiment have multiple holes H1, H2 formed therein that are not involved in the crimping joint with the protrusions T1, T2.

[0046] 16, 18, and 19, in the ventilated brake disc according to this embodiment, the protruding ends of the protrusions T1 and T2 that fit through the first opening A1 are plastically deformed in the radial direction to form crimped joints K. As shown in Fig. 16, these crimped joints K are alternately fitted from the front and back surfaces in the radial direction of the support portion 3b, and as shown in Fig. 19, they are plastically deformed toward the tapered shapes of the holes H1 and H2, thereby enabling them to be firmly prevented from coming out.

[0047] Next, a method for manufacturing a ventilated brake disc according to a second embodiment will be described. By matching the first disk 1 to the front side and the second disk 2 to the back side of the support portion 3b of the main body 3, as shown in Figures 16 and 18, multiple protrusions T1 and T2 formed on the first disk 1 and the second disk 2, respectively, are inserted into multiple hole portions H3 formed in the support portion 3b of the main body 3 (insertion process).

[0048] Thereafter, the protrusions T1 and T2 inserted into the holes H1 and H2 in the insertion step are pressurized and deformed to crimp and join the first disk 1 and the second disk 2 to the support portion 3b (crimping and joining step). In this crimping and joining step, as shown in Figures 18 and 19, a crimping tool L is inserted through the second opening A2 into the protrusions T1 and T2 inserted through the first opening A1, and pressure is applied to the tips of the protrusions T1 and T2 to plastically deform them in the radial direction, thereby forming a crimped joint K. In the insertion step and the crimping and joining step, the support portion 3b is positioned and fixed by the lower mold D, as shown in Figures 18 and 19.

[0049] According to this embodiment, the disks (first disk 1 and second disk 2) and the support portion 3b are integrated by crimping the protrusions T1 and T2 inserted into the holes H1 and H2, thereby eliminating the need for a heating process to join the disks (first disk 1 and second disk 2) and the support portion 3b of the main body 3, thereby reducing manufacturing costs.

[0050] Furthermore, the hole portion H3 in this embodiment has a tapered inner surface as a through hole, and the second opening A2 on the opposite side has a larger diameter than the first opening A1 on the insertion side of the convex portions T1 and T2. The tips of the convex portions T1 and T2 inserted through the first opening A1 are plastically deformed in the radial direction to be crimped and joined, so that crimping joining using the crimping tool L can be performed well and reliably.

[0051] Furthermore, the hole H3 in this embodiment is formed in the support portion 3b of the main body 3, and the protrusions T1 and T2 are formed in the first disk 1 and the second disk 2, respectively, so that the protrusions T1 and T2 of the disks (first disk 1 and second disk 2) can be crimped and joined to the hole H3 of the support portion 3b, thereby ensuring a secure joining of the disks (first disk 1 and second disk 2) and the support portion 3b.

[0052] Furthermore, the protrusions T1 and T2 in this embodiment are formed in multiple radial directions on the disks (first disk 1 and second disk 2) and are alternately inserted from the front and back surfaces of the support portion 3b along the radial direction, thereby improving the radial joining force between the disks (first disk 1 and second disk 2) and the support portion 3b and reliably maintaining the joining between the disks (first disk 1 and second disk 2) and the main body 3.

[0053] Next, experimental results of the ventilated brake disc according to this embodiment will be described. Two test pieces were prepared, each having a disk with a convex portion and a hole formed therein, similar to those in the first embodiment, and a support portion, with the convex portion inserted into the hole being crimped. As shown in Fig. 20, these test pieces are one with a tapered hole (taper angle 20°) formed therein (referred to as test piece 1), and the other with a tapered hole (taper angle 30°) formed therein (referred to as test piece 2).

[0054] A peel test was then conducted, and the maximum point test force required until the disc and the support part peeled off was 4110 (N) for test piece 1 and 7550 (N) for test piece 2, as shown in Fig. 21. A tensile load test was also conducted, and the maximum test force required until the crimped joint broke or the hole deformed was 18230 (N) for test piece 1 and 18270 (N) for test piece 2, as shown in Fig. 22. A compressive load test was also conducted, and the maximum test force required until the crimped joint broke or the hole deformed was 44800 (N) for test piece 1 and 43500 (N) for test piece 2, as shown in Fig. 23.

[0055] Although the present embodiment has been described above, the present invention is not limited to this, and for example, the hole portions H1 to H3 may have an opening shape other than a round hole (for example, an elliptical opening or a rectangular opening), in which case they may be crimped to form a convex portion that matches the opening shape. Furthermore, the support portion 3b is not limited to a rectangular portion as in the above embodiment, and may have another shape. [Industrial Applicability]

[0056] Other forms of ventilated brake discs and manufacturing methods thereof may be used as long as they are of the same spirit as the present invention. [Explanation of symbols]

[0057] 1 Disc 1 1a aperture 2. Disc 2 2a aperture 3 Main unit 3a central part 3aa central hole 3ab mounting hole 3b Support part H1, H2, H3 holes T1, T2 convex parts K crimped joint L Crimping Tool D Lower mold A1 First opening A2 Second opening

Claims

1. Two discs facing each other, a main body having a central portion that can be attached to an axle of a vehicle, and a plurality of support portions that extend radially from the central portion in a radial direction and support the two disks while separating them by a predetermined distance; A ventilated brake disc comprising: a plurality of holes formed in one of the disk and the support portion of the body; a plurality of protrusions formed on the other of the disk and the support portion of the main body; wherein the disc and the support portion are joined by caulking the protrusion inserted into the hole.

2. 2. The ventilated brake disc according to claim 1, wherein the hole portion is a through hole having a tapered inner peripheral surface, a second opening on the opposite side having a larger diameter than a first opening on the insertion side of the convex portion, and the protruding end of the convex portion fitted through the first opening is plastically deformed in the radial direction and crimped.

3. 2. The ventilated brake disc according to claim 1, wherein the hole is formed in the disc, and the protrusion is formed in the support portion of the main body.

4. 4. The ventilated brake disc according to claim 3, wherein the protrusions are formed in a plurality in the radial direction of the support portion, and are alternately formed to protrude from the front and back surfaces of the support portion in the radial direction.

5. 2. The ventilated brake disc according to claim 1, wherein the hole is formed in the support portion of the main body, and the protrusion is formed on the disc.

6. 6. The ventilated brake disc according to claim 5, wherein the protrusions are formed in a plurality in the radial direction of the disc and are alternately fitted into the support portion from the front and rear surfaces along the radial direction.

7. Two discs facing each other, a main body having a central portion that can be attached to an axle of a vehicle, and a plurality of support portions that extend radially from the central portion in a radial direction and support the two disks while separating them by a predetermined distance; A method for manufacturing a ventilated brake disc comprising: an insertion step of inserting a plurality of protrusions formed on one of the disc and the support portion of the main body into a plurality of holes formed on the other of the disc and the support portion of the main body; a crimping step of crimping and joining the disk and the support part by applying pressure to and deforming the protrusion inserted into the hole in the insertion step; A method for manufacturing a ventilated brake disc, comprising the steps of:

8. 8. A method for manufacturing a ventilated brake disc according to claim 7, wherein the hole portion is a through hole having a tapered inner peripheral surface, and a second opening on the opposite side is formed with a larger diameter than a first opening on the insertion side of the convex portion, and the crimping step crimps the convex portion inserted from the first opening by inserting a crimping tool through the second opening and applying pressure to the tip of the convex portion to plastically deform it in the radial direction.

9. 8. The method for manufacturing a ventilated brake disc according to claim 7, wherein the hole is formed in the disc, and the protrusion is formed in the support portion of the main body.

10. 10. The method for manufacturing a ventilated brake disc according to claim 9, wherein the protrusions are formed in a plurality in the radial direction of the support portion, and are alternately formed to protrude from the front and back surfaces of the support portion in the radial direction.

11. 8. The method for manufacturing a ventilated brake disc according to claim 7, wherein the hole is formed in the support portion of the main body, and the protrusion is formed on the disc.

12. The manufacturing method of a ventilated brake disc according to claim 11, characterized in that a plurality of the protrusions are formed in the radial direction of the disc, and are fitted alternately from the front and back surfaces of the support part in the radial direction.

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