JP2010014190A - Floating brake disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floating brake disk, manufacturable without increasing manufacturing cost, and capable of improving extraction strength in a connecting pin while preventing damage of an anticorrosion coating film. <P>SOLUTION: This floating brake disk has a plate annular braking disk 10 forming a plurality of braking side connecting recessed parts 15 in an inner peripheral part, a hub disk 20 forming a hub side connecting recessed part 25 opposed to the braking side connecting recessed parts 15 in an outer peripheral part and fitted to the inside of the braking disk 10, and the connecting pin 32 installed in a connecting hole 31 formed by butting both connecting recessed parts 15 and 25, and has a cylindrical caulking part 43A capable of forming a collar part for connecting both disks 10 and 20 by caulking to at least one end part, that is, the caulking part 43A forming a chamfering surface 45A on a tip outer peripheral surface and constituting an inner peripheral surface in the same diameter over the total length, as the connecting pin 32, and uses an object of forming an anticorrosion processing layer on a surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a floating brake disc that can be suitably used for a brake disc of a disc brake device of a motorcycle.

  Generally, as a brake disc of a motorcycle disc brake device, an annular braking disc to which a brake pad is pressed, a hub disc mounted inside the braking disc, and a plurality of connecting means for connecting both discs in a floating state A so-called floating brake disc has been widely put into practical use in which a gap between both discs is utilized to prevent the brake disc from being deformed as a whole due to heat generated during brake operation.

  As the connecting means, a plurality of braking side connecting recesses are formed on the inner peripheral portion of the brake disk, a hub side connecting recess facing the braking side connecting recess is formed on the outer peripheral portion of the hub disk, and the both connecting recesses are combined. The connecting pin is mounted in the formed connecting hole, and a disc spring and a washer are externally fitted to the connecting pin, and the both ends of the connecting pin are crimped to connect both disks in a floating state. The thing is widely employ | adopted (for example, refer patent document 1).

  As described in Patent Document 1, the connecting pin includes a substantially cylindrical body portion that is mounted in the connection hole without any gap, and a first flange having a diameter larger than that of the connection hole formed at one end of the body portion. And a step portion formed at a boundary portion between the body portion and the caulking portion, and a disc spring and a washer on the body portion. In this state, the body part is attached to the connection hole, and in this state, the caulking part is caulked to form the second collar part, and the disc spring and the washer are fixed to both disks together with the connection pin by the second collar part. In this case, a configuration in which both disks are connected in a floating state is employed.

  By the way, when the caulking portion of the connecting pin is caulked, the caulking roller is inserted into the caulking portion and the caulking portion is gradually expanded in diameter while rotating the caulking roller. There has been a problem that the corrosion-resistant coating formed on the surface of the connecting pin is damaged when the caulking roller is pressed.

  In order to prevent such damage of the corrosion-resistant coating, a connection pin is also proposed in which a chamfered portion having at least a part of a convex arc shape is provided on the peripheral surface of the end portion of the center hole of the connection pin ( For example, see Patent Document 2.) In addition, it is not intended to prevent damage to the corrosion-resistant coating, but a chamfered surface is formed on the outer peripheral surface of the caulking portion of the connecting pin, and the inner diameter of the center hole is set to the same diameter over the entire length. Pins have also been proposed (see, for example, Patent Document 3).

6-76727 JP 2001-187910 A 6-69463

  By the way, when the chamfered portion is formed on the peripheral surface of the end portion of the center hole of the connecting pin as described in Patent Document 2, it is possible to prevent the corrosion-resistant coating from being damaged by caulking, but the enlarged diameter portion formed by caulking. There is a problem that a gap is formed between the washer and the enlarged diameter portion engages with the washer only at the base to prevent the connecting pin from being pulled out, so that the pull-out strength of the connecting pin cannot be secured sufficiently. .

  An object of the present invention is to provide a floating brake disc that can be manufactured without increasing the manufacturing cost and that can improve the pull-out strength of a connecting pin while preventing damage to a corrosion-resistant coating.

  The present inventor manufactured and tested various types of connection pins with respect to the shape of the connection pins so that the corrosion-resistant coating is not damaged when the connection portions of the connection pins are caulked, and the pull-out strength can be sufficiently secured. As a result, a test result has been obtained that a chamfered surface is formed on the outer peripheral surface of the front end of the caulking portion, and an inner peripheral surface of the caulking portion has the same diameter over the entire length, and the present invention has been completed. It was.

  The floating brake disc according to the present invention includes a flat plate-shaped brake disc having a plurality of braking side connection recesses formed on an inner periphery thereof, and a hub side connection recess facing the brake side connection recesses formed on the outer periphery. A hub disk fitted inside the brake disk and a connection pin assembled in a connection hole formed by abutting the two connection recesses, and for connecting the two disks by caulking at least at one end as the connection pin A cylindrical caulking portion capable of forming a flange portion, having a chamfered surface formed on the outer peripheral surface of the tip, an inner peripheral surface having the same diameter over the entire length, and a corrosion-resistant layer on the surface. What is formed is used.

  In this brake disk, a connecting pin is loaded into a connecting hole formed by combining a braking disk and a hub disk, and a connecting pin is fitted with a washer or a disc spring, or the end of the connecting pin is left as it is. The caulking portion formed in the portion is caulked, and both disks are connected in a floating state by the connecting pin. In this connection pin, a chamfered surface is formed on the outer peripheral surface of the front end of the caulking portion, and the inner peripheral surface of the caulking portion is configured to have the same diameter over the entire length. The damage of the corrosion-resistant layer when the caulking portion is caulked is prevented. In addition, the collar part that is formed by caulking the caulking part can be caulked so as to be in surface contact with the washer and both disks without any substantial gap, and the contact area between the washer or both disks and the collar part of the connecting pin is set large. Thus, the pull-out strength of the connecting pin can be improved.

  Here, a tapered surface, an annular curved surface having a convex arc cross section, or an annular curved surface having a concave arc cross section can be formed as the chamfered surface. By forming such a chamfered surface, it is possible to prevent the corrosion-resistant layer from being damaged when the caulking portion is caulked.

  As the connection pin, a cylindrical body portion that is mounted in the connection hole with almost no gap, a first flange portion that is larger in diameter than the body portion formed at one end portion of the body portion, and the other end portion of the body portion It is possible to use a connecting pin that has the caulking portion provided continuously and can form a second flange portion larger in diameter than the body portion by caulking the caulking portion. Caulking portions can be formed at both ends of the connection pin, but if the first flange portion is formed in advance on the connection pin, the molding accuracy of the first flange portion can be improved.

  In a preferred embodiment, the connecting pin is made of an aluminum alloy. Aluminum alloys are preferred because they are lighter than iron-based metals such as stainless steel, are excellent in workability, and are easily caulked.

  The caulking portion of the connecting pin can be caulked by pressing to form a collar portion. In this case, the work time for caulking can be shortened compared with the case of caulking with a roller, and more than one connecting pin can be caulked simultaneously. It can be improved. Further, it is preferable because damage to the corrosion-resistant treatment layer can be prevented as compared with the case of using a roller.

  It is also a preferred embodiment to interpose an elastic member between the flange of the connecting pin and the disk. With this configuration, both disks can be floating supported by the elastic member so that both disks are arranged in the same plane.

  According to the floating brake disc of the present invention, a chamfered surface is formed on the outer peripheral surface of the caulking portion, and the inner peripheral surface of the caulking portion is configured to have the same diameter over the entire length, when the caulking portion is caulked. It is possible to effectively prevent the corrosion resistant treatment layer from being damaged. For this reason, damage to the corrosion-resistant layer can be prevented without increasing the manufacturing cost of the connecting pin. In addition, since the caulked portion can be caulked until the caulked portion after the caulking comes into surface contact with the washer and both disks, the pulling strength of the connecting pin can be improved.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, a floating brake disk 1 is a brake disk for a motorcycle, and is a flat plate-shaped brake disk 10 and a hub fitted inside with a predetermined gap inside the brake disk 10. A disk 20 and a plurality of connecting means 30 for connecting the brake disk 10 and the hub disk 20 in a floating state are provided.

  The brake disk 10 is formed by press-molding a flat metal plate made of stainless steel or carbon steel having excellent wear resistance, and then heat-treats an annular sliding portion 11 to which a brake pad (not shown) is slidably contacted. It has been produced. A plurality of small holes 12 are formed in the sliding portion 11 in order to improve heat dissipation performance and reduce weight. As the small holes 12, it is possible to form long and narrow slit-shaped holes other than the round holes as shown in FIGS. 1 and 2, and the shape, number and arrangement of the small holes 12 are the design characteristics of the brake disk 1. Or it can set suitably in consideration of the heat dissipation in sliding part 11. A plurality of concave portions 13 and 14 are formed at regular intervals in the circumferential direction on the outer peripheral portion and the inner peripheral portion of the brake disc 10, and the heat dissipation of the brake disc 1 is enhanced and the weight reduction is promoted. It is configured to express novelty. The number and shape of the recesses 13 and 14 can be arbitrarily set. However, the present invention can be similarly applied to a brake disc in which at least one of the recesses 13 and 14 is omitted. As the dimensions of the brake disk 10, for example, those set to an outer diameter of 300 mm and a thickness of 6 mm can be adopted.

  The hub disk 20 is made of a light metal material such as an aluminum alloy in order to reduce the weight, for example. An attachment hole 21 through which the end of the wheel hub is inserted is formed at the center of the hub disk 20, and a plurality of bolt insertion holes 22 for attachment to the wheel hub are formed so as to surround the attachment hole 21. . A plurality of reduction holes 23 are formed at regular intervals in the circumferential direction in the middle of the hub disk 20 in the radial direction.

  In the brake disk 1 shown in FIGS. 1 to 3, the brake disk 10 and the hub disk 20 are arranged in the same plane. However, the brake disk 10 and the hub disk 20 are connected to the brake disk 1 according to the configuration on the vehicle body side. It is also possible to arrange them in parallel planes that are spaced apart in the thickness direction (axial direction). The present invention is characterized by the configuration of the connecting means 30, and the configuration of the brake disk 10 and the hub disk 20 can be appropriately selected from existing structures.

  The connecting means 30 is provided between the brake disk 10 and the hub disk 20 at regular intervals in the circumferential direction. In FIG. 1, the brake disk 10 and the hub disk 20 are connected in a floating state by eight connecting means 30, but it is also possible to connect both the disks 10, 20 in a floating state by a number of connecting means 30 other than eight. It is.

  The connecting means 30 will be described. As shown in FIGS. 1 to 3, a semicircular braking side connecting recess 15 is formed in the inner peripheral portion of the braking disk 10 at the position where the connecting means 30 is disposed, and the hub disk 20. A semicircular hub-side connecting recess 25 is formed on the outer peripheral portion of the outer peripheral portion so as to face the braking-side connecting recess 15. As a result, a substantially circular connecting hole 31 is formed. A connection pin 32 is mounted in the connection hole 31, and relative rotation and relative movement in the axial direction of both the disks 10 and 20 are restricted by the connection pin 32. A disc spring (which corresponds to an elastic member) 33 and a washer 34 for receiving the disc spring 33 are attached to the connecting pin 32 so that the discs 10 and 20 are positioned in the same plane. 20 is connected in a floating state via a connecting pin 32, a disc spring 33 and a washer 34.

  As shown in FIG. 3, the connecting pin 32 is formed of a hollow member made of a light metal material such as a cylindrical aluminum alloy or magnesium alloy having a center hole 40, and is fitted in the connecting hole 31 so as to be fitted in substantially without any gap. Formed in the cylindrical body portion 41, the first flange 42 for retaining the larger diameter than the connecting hole 31 formed in one end portion of the body portion 41, and the other end portion of the body portion 41. A second collar 43 for retaining the diameter larger than that of the coupling hole 31, which is formed by caulking the caulking section 43 </ b> A of the coupling pin 32 </ b> A illustrated in FIGS. 4A, 6, and 7. Part 43.

  The connection pin 32A shown in FIG. 4A is a part before the second flange part 43 of the connection pin 32 is formed by caulking, and the upper end part of the body part 41 is made to correspond to the second flange part 43. A cylindrical caulking portion 43A is continuously provided. The connecting pin 32A is subjected to anodizing, plating, or the like, and a corrosion-resistant layer (not shown) such as an aluminum oxide film or chrome plating is formed on the surface of the connecting pin 32A.

  A step portion 44 is formed in the middle of the length direction of the body portion 41 of the connecting pin 32 </ b> A, and the body portion 41 above the step portion 44 is configured to have a smaller diameter than the body portion 41 below the step portion 44. The outer diameter of the caulking portion 43 </ b> A is configured to be the same as that of the body portion 41 above the stepped portion 44. However, the stepped portion 44 can be formed at any position as long as the deformation due to caulking does not adversely affect the portion of the body portion 41 that fits in the connecting hole 31 without any gap. A stepped portion 44 can also be formed at the boundary between the caulking portion 43A and the body portion 41. Further, as described above, it is preferable to provide the stepped portion 44 and configure the caulking portion 43A to have a smaller diameter than the body portion 41 because the caulking operation of the caulking portion 43A is facilitated. That is, it is also possible to employ a connecting pin in which the outer diameter of the caulking portion is the same as that of the body portion.

  The diameter of the inner peripheral surface of the caulking portion 43A and the body portion 41 of the connecting pin 32A is configured to be the same throughout the entire length, and the conical chamfer that is reduced in diameter toward the distal end side on the outer peripheral surface of the caulking portion 43A. A surface 45A is formed, and the outer peripheral portion of the tip of the connecting pin 32 is thinned by forming a chamfered surface 45A. Then, the diameter of the inner peripheral surface of the caulking portion 43A is configured to have the same diameter over the entire length as described above, and the caulking portion 43A is caulked by forming the chamfered surface 45A on the outer peripheral portion of the distal end of the connecting pin 32, so that the second flange When forming the part 43, it is comprised so that the corrosion-resistant process layer of the connection pin 32A may not be damaged. Further, the end face on the washer 34 side of the second flange portion 43 formed by caulking is formed in a wide annular surface 47 disposed in a plane perpendicular to the axial center of the connecting pin 32, and the annular surface 47 causes The contact area between the two collar portions 43 and the washer 34 is set large, and the pull-out strength of the connecting pin 32 is increased.

  In addition, as an example of another connecting pin in which the configuration of the chamfered surface 45A is partially changed, the inclination angles of the chamfered surfaces 45B and 45C are as shown in FIG. 4B and FIG. 4C as the connecting pins 32B and 32C. What changed (theta) can be employ | adopted. When the inclination angle θ is less than 20 °, the pulling strength is reduced due to the thin plate shape, and when it exceeds 45 °, the extraction strength is reduced due to the leading edge (tapered) shape. It is preferable to set to 20 ° to 45 °. Further, as shown in FIGS. 4A and 4B, an annular end face 46 orthogonal to the center line of the connecting pins 32A and 32B can be formed, or like the connecting pin 32C shown in FIG. 4C. The chamfered surface 45C can also be formed sharply. Further, instead of the conical chamfered surfaces 45A to 45C, a convex shape protruding outward in the radial direction of the connecting pins 32D and 32E, like the connecting pins 32D and 32E shown in FIGS. Concave arc sections projecting inward in the radial direction of the connecting pins 32F and 32G, such as chamfered surfaces 45D and 45E made of an annular curved surface having an arc section, and connecting pins 32F and 32G shown in FIGS. It is also possible to form chamfered surfaces 45F and 45G made of an annular curved surface. The radius R1 of the circular arcs of the chamfered surfaces 45D and 45E shown in FIGS. 5 (a) and 5 (b) can be arbitrarily set. However, if the radius is less than 5 mm, the tip has a tapered shape and the pull-out strength decreases. And since it may generate | occur | produce in a pin when it exceeds 20 mm, it is preferable to set radius R1 to 5 mm-20 mm. Further, the radius R2 of the arcs of the chamfered surfaces 45F and 45G shown in FIGS. 5C and 5D can be arbitrarily set. However, if the radius is less than 5 mm, there is a possibility that the pin may be damaged. If it exceeds 20 mm, it will be a tapered shape (tapered) and the pullout strength will decrease, so the radius R2 is preferably set to 5 mm to 20 mm. Further, it is also preferable to form rounds at the upper end and lower end of the chamfered surfaces 45A to 45G to round the corners in order to prevent the corrosion-resistant treatment layer from being damaged.

  A disc spring 33 and a washer 34 are mounted on the body 41 between the first flange 42 and the two discs 10 and 20 so as to fit externally, and the discs 10 and 20 are arranged in the same plane by the disc spring 33. Is being energized. However, at least the washer 34 of the washer 34 and the disc spring 33 can be omitted. Further, as the connecting pin 32, a cross-sectional shape of the body portion 41 having a rectangular shape such as an ellipse, a square, or a rectangle can be adopted. In this case, the shape of the connection hole 31 is also adapted to the body portion 41. It will form in the shape to do.

  As shown in FIG. 3, the disc spring 33 is formed of a gentle conical disk-shaped member, and in a state where the disc spring 33 is assembled between the first flange portion 42 and both the disks 10 and 20, The distance H between the disks 10 and 20 and the third flange 43 is set to be slightly shorter than the height of the disc spring 33 in the natural state so that the disc spring 33 is somewhat compressed. However, a wave spring or the like can be employed instead of the disc spring 33.

  The caulking process of the caulking portion 43A can be performed by a press device or a rotary caulking device using a roll, but caulking by the press device causes damage to the corrosion-resistant layer of the connecting pin 32. It is preferable in preventing.

  As shown in FIGS. 6 and 7, the press device includes a punch 50 and a die 51. The punch 50 is inserted into the center hole 40 of the connecting pin 32A and pushes the tip end portion of the caulking portion 43A outward. A first frustum-shaped first molding surface 50a and a second molding surface 50b that guides the distal end portion of the push-clamped caulking portion 43A to the radially outward side of the connecting pin 32 are provided. It is possible to adopt a configuration in which a housing portion 51a capable of housing the portion 42 is provided, and the second collar portion 43 can be press-molded by caulking the caulking portion 43A with the punch 50 in a state where the washer 34 is pressed by the pressing sleeve 52. .

  Further, as shown in FIG. 8, a rotary caulking device using a roll includes a support head 55 supported so as to be rotatable about an axis P1, and a shaft of the support head 55 at an eccentric position of the support head 55. A roll 56 that is rotatable about an axis P2 that is inclined with respect to the center P1 and a mounting table 57 having a recess 57a for mounting the connecting pin 32 are provided. Then, a frustoconical molding surface 56a is formed which is inserted into the center hole 40 of the connecting pin 32A and pushes the tip of the caulking portion 43A outward, rotates the support head 55 around the axis P1, and rotates the roll 56. While rotating around the axis P2, the forming surface 56a of the roll 56 is brought into pressure contact with the inner peripheral surface of the tip of the caulking portion 43A, and the caulking portion 43A is caulked to form the second flange 43. It can be adopted things.

An example of an assembly method of the floating brake disc 1 will be briefly described with reference to the drawings.
First, as shown in FIG. 7, the first brim portion 42 is mounted on each of the eight accommodating portions 51 a formed on the die 51 of the press device, and the eight connecting pins 32 </ b> A are set on the die 51.

  Next, as shown in FIG. 7, the eight brake-side connecting recesses 15 of the brake disk 10 face the eight connection pins 32A, respectively, and the brake disk 10 is set on the upper surface of the die 51 from above and the hub disk. 20 hub side connecting recesses 25 of 20 are respectively faced by eight connecting pins 32A, and the hub disk 20 is set on the upper surface of the die 51 from above.

  Next, as shown in FIG. 7, the disc spring 33 and the washer 34 are attached to the lower half of the caulking portion 43A of the connecting pin 32A in an outer fitting shape, and as shown in FIG. The caulking portion 43A is caulked by 50a and 50b to form the second flange portion 43, and the discs 10 and 20 are connected in a floating state by the connecting pin 32, the disc spring 33 and the washer 34.

  In this connecting means 30, since the connecting pin 32 is formed by forming a chamfered surface 45A on the outer peripheral portion of the tip end of the caulking portion 43A and forming the inner peripheral surface of the caulking portion 43A with the same diameter over the entire length thereof. When the second flange portion 43 is formed by caulking the portion 43A, the problem that the corrosion-resistant coating layer is damaged can be prevented. Further, a flat annular surface 47 is formed on the washer 34 side of the second flange part 43, and the contact area between the second flange part 43 and the washer 34 is widened, so that the pulling strength of the connecting pin 32 can be improved.

  Further, a stepped portion 44 is formed between the caulking portion 43A and the body portion 41, and the caulking portion 43A is configured to be thinner than the body portion 41, so that the caulking load is prevented from acting on the body portion 41 side. Thus, deformation of the body portion 41 due to the caulking load can be prevented.

Next, an evaluation test of the connecting pin 32 will be described.
As Examples 1 and 2, the connecting pin 32J of Example 1 having a dimension as shown in FIG. 9A and having a chamfered surface 45J having a radius of 10 mm as a chamfered surface on the outer peripheral portion of the caulking portion 43A; As shown in (b), the connecting pin 32K of Example 2 configured in the same manner as the connecting pin 32J of Example 1 was manufactured except that a chamfered surface 45K having a radius of 15 mm was formed as a chamfered surface. As Comparative Example 1, as shown in FIG. 10A, a connecting pin 32L configured similarly to the connecting pin 32J of Example 1 was manufactured except that the chamfered surface was omitted. As Comparative Example 2, a connecting pin 32M having a dimension as shown in FIG. 10B and having a tapered chamfered surface 45M on the inner peripheral surface of the tip was manufactured. And the alumite process was given to the manufactured connecting pins 32J-32M as a corrosion-resistant coating layer.

  The connecting pins 32J to 32M manufactured in this way are assembled together with a disc spring 33 and a washer 34 to a pair of jigs 60 having a C-shaped cross section of a tensile tester, as shown in FIG. A pulling strength of ˜32M was measured. Specifically, in a state where a pair of jigs 60 having a C-shaped cross section are combined back to back, the connection pins are inserted into the connection holes 61 formed in both jigs 60 in the same manner as when the connection pins 32A are assembled to the brake disc. After loading, with the disc spring 33 and the washer 34 fitted on the connecting pin, two types of test devices 62 are connected: the caulking portion of the connecting pin is caulked by a press and the caulking portion is caulked by a roll. Each of the pins 32J to 32M was manufactured. Then, the anodized layer of the connecting pin 32 of the manufactured test tool 62 is visually inspected for damage such as peeling or cracking by caulking, and then the test tool 62 is pulled out to a pair of test machines. The pair of jigs 60 of the test device 62 were separated from each other and the connecting pin was subjected to a tensile test, and the maximum tensile load was measured as the maximum drawing load. The results are shown in Table 1. For the test device 62 assembled with the connecting pins 32J, 32K, and 32M, after the connecting pins 32J, 32K, and 32M are caulked, the connecting pin connecting pins are cut vertically by a processing machine such as a wire saw. The cross-sectional shape of was taken. FIG. 12 is a drawing showing the appearance of the photographed cross-sectional shape. FIG. 12 (a) is a cross-sectional view of the connecting pin 32Ja of Example 1 caulked with a roller, and FIG. 12 (b) is a press. FIG. 12C is a longitudinal sectional view of the connecting pin 32K of the second embodiment caulked with a roller, and FIG. It is the longitudinal cross-sectional view of the connection pin 32M of the comparative example 2 caulked with the roller.

  From Table 1, as in the case of the connecting pin 32L of Comparative Example 1, if the chamfered surface is not formed on the tip outer peripheral portion of the caulking portion 43A, the pulling strength is reduced as compared with Examples 1 and 2, and the alumite is damaged. It can be seen that there is a problem that the corrosion resistance is lowered. Further, even when a chamfered surface is formed as in the connecting pin 32M of Comparative Example 2, if the chamfered surface is formed on the inner peripheral surface of the tip, the alumite is not damaged, but the pullout strength is remarkably reduced. You can see that As the cause, the cross-sectional shape after caulking of the connecting pin 32M of Comparative Example 2 is as shown in FIG. 12D, and the second flange 43M bulging outward is formed at the tip of the connecting pin 32M. Although formed, the second flange 43 that protrudes greatly outward is not formed as seen in the connecting pins 32J and 32K of the first and second embodiments shown in FIGS. 12 (a) to 12 (c). In addition, unlike the connecting pins 32J and 32K of the first and second embodiments, the annular surface 47 in the direction perpendicular to the axis is not formed on the side of the washer 34 of the second flange portion 43M, and the hook with the washer 34 is sufficient. Therefore, it can be estimated that the pull-out strength is reduced.

  Further, as in the first embodiment, even when the connecting pin 32J having the chamfered surface 45J formed on the outer periphery of the caulking portion 43A is used, the caulking by the roller is compared with the caulking by the press. Thus, although the pull-out strength is somewhat increased, it can be seen that it is preferable to caulk with a press because alumite is damaged and corrosion resistance is lowered.

Brake disc perspective view Front view of brake disc III-III sectional view of FIG. (A) is a longitudinal cross-sectional view of a connection pin, (b) (c) is a longitudinal cross-sectional view of the connection pin of another structure. (A)-(d) is a longitudinal cross-sectional view of the connection pin of another structure Illustration of press caulking device Longitudinal sectional view of the connecting means just before caulking the connecting pin Illustration of caulking device with roll (A) The longitudinal cross-sectional view of the connection pin of Example 1 (b) is the longitudinal cross-sectional view of the connection pin of Example 2. (A) The longitudinal cross-sectional view of the connection pin of the comparative example 1 (b) is the longitudinal cross-sectional view of the connection pin of the comparative example 2. Explanatory drawing of tensile testing machine It is drawing which copied the cross-sectional shape of an actual connection pin, (a) is sectional drawing of the connection pin of Example 1 crimped with the roller, (b) is the connection of Example 1 crimped with the press. It is sectional drawing of a pin, (c) is a longitudinal cross-sectional view of the connection pin of Example 2 crimped with the roller, (d) is a longitudinal cross-sectional view of the connection pin of Comparative Example 2 crimped with the roller It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Brake disc 10 Brake disc 11 Sliding part 12 Small hole 13 Recess 14 Recess 15 Braking side connection recessed part 20 Hub disk 21 Mounting hole 22 Bolt insertion hole 23 Mitigation hole 25 Hub side connection recessed part 30 Connection means 31 Connection hole 32 Connection pin 33 Belleville spring 34 Washer 40 Center hole 41 Body portion 42 First flange portion 43 Second flange portion 43A Caulking portion 44 Stepped portion 46 End surface 47 Annular surface 32A to 32G Connecting pin 45A to 45G Chamfered surface 50 Punch 50a First molding surface 50b First 2 Forming surface 51 Die 51a Housing part 52 Pressing sleeve 55 Support head 56 Roll 56a Forming surface 60 Jig 61 Connecting hole 62 Test tool 63 Shaft member

Claims (6)

A flat plate-shaped braking disk having a plurality of braking-side coupling recesses formed on the inner periphery;
A hub side coupling recess facing the braking side coupling recess is formed on the outer periphery, and a hub disk fitted inside the braking disk;
A connecting pin assembled in a connecting hole formed by abutting both the connecting recesses;
With
The connecting pin is a cylindrical caulking portion capable of forming a flange for caulking both discs at least at one end portion, and a chamfered surface is formed on the outer peripheral surface of the tip, and the inner peripheral surface is the same over the entire length. It has a caulking part configured in diameter, and used a corrosion-resistant layer formed on the surface,
This is a floating brake disc.   The floating brake disc according to claim 1, wherein a tapered surface, an annular curved surface having a convex arc cross section or an annular curved surface having a concave arc cross section is formed as the chamfered surface.   As the connection pin, a cylindrical body portion that is mounted in the connection hole with almost no gap, a first flange portion that is larger in diameter than the body portion formed at one end portion of the body portion, and the other end portion of the body portion The floating brake disc according to claim 1 or 2, wherein the connecting pin has a caulking portion provided continuously, and a connecting pin capable of forming a second flange portion larger in diameter than the body portion by caulking the caulking portion. .   The floating brake disc according to any one of claims 1 to 3, wherein the connecting pin is made of an aluminum alloy.   The floating brake disk according to any one of claims 1 to 4, wherein a caulking portion is formed by caulking the caulking portion of the connecting pin by pressing. The floating brake disk according to any one of claims 1 to 5, wherein an elastic member is interposed between the flange of the connecting pin and the disk.

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