Brake Disc and Method for Manufacturing the Same

Abstract

To provide a brake disc capable of improving heat radiation effect more and a method of manufacturing the same.SOLUTION: There is provided a brake disc 1 that is fitted to an axle of a vehicle and has its brake pad 5 pressed to brake the vehicle, wherein a plurality of dewatering holes 3a penetrating from one surface Sa to the other surface Sb are formed in a predetermined region extending in a circumferential direction, and a dewatering hole 3a has an opening 3aa formed in the one surface Sa and an opening 3ab formed in the other surface Sb while offsetting at least in a radial direction H of the disc.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a brake disk attached to an axle of a vehicle and a method for manufacturing the same, which brakes the vehicle by pressing brake pads.

Background Art

[0002] As a brake device disposed in a vehicle such as a passenger car or a motorcycle and capable of braking the vehicle, a disk brake device including a brake disk and brake pads has become widespread. Such a disk brake device is configured to obtain a braking force by attaching a brake disk to a wheel of a vehicle so as to be rotatable integrally therewith and pressing a brake pad against the brake disk.

[0003] Such a brake disk has drain holes penetrating the disk at a plurality of locations in the pressing area of the brake pad, as disclosed in, for example, Patent Document 1. Such drain holes are formed by a punching device such as punching, and are considered to be able to improve heat dissipation due to an increase in surface area and reduce the weight of the brake disk.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, although the conventional brake disk can improve the heat dissipation effect by means of drain holes, in recent times, a further heat dissipation effect has been demanded, and the applicant of the present application has conducted intensive studies on the form of the drain holes. In addition, such heat dissipation measures by drain holes are not limited to the floating type brake disk in which the bracket portion and the disk portion are separately configured, and are similarly required in a so-called solid type brake disk in which the portion attached to the vehicle axle and the portion pressed by the brake pad are integrated.

[0006] The present invention has been made in view of such circumstances, and an object thereof is to provide a brake disk and a method for manufacturing the same that can further improve the heat dissipation effect.

Means for Solving the Problems

[0007] The invention according to claim 1 is a brake disk attached to a vehicle axle and pressed by a brake pad to brake the vehicle, wherein a plurality of drain holes penetrating from one surface to the other surface are formed in a predetermined region extending in the circumferential direction, and the drain holes are positioned such that the openings formed on one surface and the openings formed on the other surface are offset at least in the radial direction of the disk. 、The center line connecting the center position of the opening on one surface and the center position of the opening on the other surface extends in a direction intersecting the rotation axis of the disk It is characterized by this.

[0009] Claim 2 The invention described in 1 In the brake disk described in claim

[0011] Claim 3 The invention described in claim 1 or Claim 2 In the brake disk described in

[0012] Claim 4 The invention described in the claim is a method for manufacturing a brake disc that is attached to an axle of a vehicle and brakes the vehicle by pressing a brake pad. The method includes placing a blank material on a die while inclining the blank material at a predetermined angle, and lowering a punch vertically with respect to the blank material to perform through-hole machining, or placing the blank material on the die in a horizontal state while lowering the punch with respect to the blank material while inclining the punch at a predetermined angle to perform through-hole machining, thereby forming drain holes that penetrate the disc at a plurality of locations in the pressing region of the brake pad. The drain holes have openings formed on one surface and openings formed on the other surface that are offset at least in the radial direction of the disc and is set such that the center line connecting the center position of the opening on one surface and the center position of the opening on the other surface extends in a direction intersecting the rotation axis of the disk characterized in that.

[0013] Claim 5 The invention described in the claim is the invention described in claim 4 In the method for manufacturing a brake disc described in the claim, the mounting surface or the punch of the die is inclined at a predetermined angle, which is characterized.

Effect of the Invention

[0014] According to the invention of claim 1, a plurality of drain holes penetrating from one surface to the other surface are formed in a predetermined region extending in the circumferential direction, and the drain holes have openings formed on one surface and openings formed on the other surface that are offset at least in the radial direction of the disc 、The center line connecting the center position of the opening on one surface and the center position of the opening on the other surface extends in a direction intersecting the rotation axis of the disk so that the heat dissipation effect can be further improved.

[0015] Claim of 2 According to the invention, the drain holes 、rotation are formed to be inclined at an angle of 10 to 30° with respect to the axis of rotation, so that the heat dissipation effect can be further improved.

[0017] Claim 3According to the invention, it is configured to have a bracket portion attached to the axle of the vehicle, a disk portion against which the brake pad is pressed, and a connecting means for connecting the bracket portion and the disk portion so as to be relatively movable. Since the drain hole is formed in the disk portion, the heat dissipation effect of the floating type brake disk in which the bracket portion and the disk portion are separately configured can be improved.

[0018] Claim 4 According to the invention, while placing the blank material on the die while inclining it at a predetermined angle, the punch is lowered in the vertical direction with respect to the blank material for through-hole machining, or the blank material is placed on the die in a horizontal state While placing it, by lowering the punch with respect to the blank material while inclining it at a predetermined angle for through-hole machining, drain holes penetrating the disk are formed at a plurality of locations in the pressing region of the brake pad, and the drain holes are formed at positions where the opening formed on one surface and the opening formed on the other surface are offset at least in the radial direction of the disk and is set such that the center line connecting the center position of the opening on one surface and the center position of the opening on the other surface extends in a direction intersecting the rotation axis of the disk Therefore, a brake disk with improved heat dissipation effect can be easily manufactured.

[0019] Claim 5 According to the invention, since the mounting surface of the die or punch is inclined at a predetermined angle, a brake disk with improved heat dissipation effect can be easily and surely manufactured.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Embodiments for Carrying Out the Invention

[0021] Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The brake disc according to the present embodiment is attached to a wheel of a vehicle such as a motorcycle and is rotatable integrally with the wheel, and is composed of a member for obtaining braking force by pressing a brake pad. As shown in FIGS. 1 and 2, it is configured to have a bracket portion 2, a disc portion 3, and a connecting means 4.

[0022] The bracket portion 2 is obtained by pressing a metal plate material made of, for example, an aluminum alloy or the like, and a plurality of mounting holes 2a are formed at predetermined positions thereof. These mounting holes 2a are for inserting fastening means such as bolts to fix the brake disc 1 to a wheel (not shown) of a vehicle such as a motorcycle. Further, the disc portion 3 is connected to the outer peripheral edge portion of the bracket portion 2 by a connecting means 4 (floating pin), and constitutes a brake disc 1 having a disc shape as a whole.

[0023] The disk portion 3 is obtained, for example, by press-working a metal plate material such as stainless steel into a substantially annular shape, and a plurality of drain holes 3a are formed at a plurality of locations in a predetermined region (the pressing region of the brake pad 5) extending in the circumferential direction. These drain holes 3a are through holes penetrating from one surface Sa to the other surface Sb of the disk portion 3, and are formed by a hole-making process such as punching, etc., and are supposed to be able to improve heat dissipation due to an increase in surface area, reduce the weight of the brake disk 1, etc.

[0024] Such a disk portion 3 rotates about the rotation axis X of the disk as the vehicle travels, and the brake pads 5 (see FIGS. 2 and 8) are pressed against one surface Sa and the other surface Sb thereof so as to be brakeable. Note that it is preferable that one surface Sa and the other surface Sb of the disk portion 3 are subjected to a surface treatment for improving wear resistance, such as high-frequency quenching.

[0025] The brake pad 5 applied to the present embodiment is made of a predetermined friction material, and as shown in FIG. 8, is formed on a pair of pistons 7 held by the caliper 6 respectively. When the driver operates an operating means such as a brake lever, the brake fluid flows through the flow path b to displace the piston 7, and the brake pad 5 is pressed against and slid on one surface Sa and the other surface Sb of the disk portion 3 that rotates with the wheels, thereby obtaining a braking force.

[0026] In the present embodiment, an opposed piston type having a pair of pistons 7 is applied, but other types (for example, a type in which the piston is disposed only on one side of one surface Sa and the other surface Sb of the brake disk 1, and the caliper 6 itself is displaced to the opposite side by the reaction force of the force pressing the brake pad 5, and the brake pad 5 on the side without the piston 7 is pressed against the brake disk 1, etc.) may be applied.

[0027] Here, as shown in FIGS. 3 and 4, the drain hole 3a according to the present embodiment is such that the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are at least offset (displaced) in the radial direction H of the disk. That is, the drain hole 3a is formed to be inclined by a predetermined angle toward the rotation axis X, and the opening 3aa and the opening 3ab are in an offset state.

[0028] In particular, for the drain hole 3a according to the present embodiment, the center line C connecting the center position of the opening 3aa on one surface Sa and the center position of the opening 3ab on the other surface Sb extends in a direction intersecting the rotation axis X of the disk. That is, for the drain hole 3a according to the present embodiment, the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset only in the radial direction H of the disk and are not offset in the circumferential direction Y of the disk (the inclination angle β in the circumferential direction Y = 0).

[0029] Further, the drain hole 3a according to the present embodiment is formed such that the center line C is inclined at an angle α of 10 to 30° with respect to the rotation axis X. In this way, the drain hole 3a has its central axis C inclined only by the angle α in the radial direction H, and by setting the inclination angle α to 10 to 30°, as shown in FIG. 9, the disk temperature can be reduced, and the heat dissipation effect is higher than that of the prior art.

[0030] More specifically, in the case of a brake disk having a drain hole 3a in which the central axis C extends perpendicular (i.e., not inclined) to the surface (one surface Sa or the other surface Sb) as in the prior art, when measuring the temperature of the brake disk 1 having a drain hole 3a in which the center line C is inclined at an angle α of 10 to 30° with respect to the rotation axis X in a usage environment where the temperature is about 253°C, the result is as shown in FIG. 9.

[0031] Therefore, according to FIG. 9, the brake disk 1 having the drain hole 3a with the center line C inclined at an angle α of 10 to 30° with respect to the rotation axis X has a lower disk temperature and a higher heat dissipation effect compared to the conventional brake disk. In particular, when the inclination angle α is 20°, it can be seen that the disk temperature is the lowest and the heat dissipation effect is the highest.

[0032] Next, another embodiment according to the present invention will be described. The brake disk according to the present embodiment is attached to a wheel of a vehicle such as a motorcycle and is rotatable integrally with the wheel, and is composed of a member for obtaining a braking force by pressing a brake pad. As shown in FIG. 5, it is configured to include a bracket portion 2, a disk portion 3, and a connecting means 4. Note that detailed descriptions of the same components as those in the previous embodiment will be omitted.

[0033] As shown in FIGS. 6 and 7, the drain hole 3a according to the present embodiment is in a position where the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset at least in both the radial direction H and the circumferential direction Y of the disk (displaced positions). That is, the drain hole 3a is formed by being inclined by a predetermined angle in a direction in which its central axis C does not intersect the rotation axis X, and the opening 3aa and the opening 3ab are in an offset state.

[0034] Specifically, the drain hole 3a according to the present embodiment is formed by being inclined by an angle β in the circumferential direction Y (strictly speaking, the tangential direction of the opening 3aa or the opening 3ab) while being inclined by an angle α in a state where the center line C connecting the center position of the opening 3aa formed on one surface Sa and the center position of the opening 3ab formed on the other surface Sb does not intersect the rotation axis X (twisted positional relationship).

[0035] In addition, the drain hole 3a according to the present embodiment is formed such that its central axis C is inclined by 30° (α = 30) with respect to the rotation axis X and by an angle β with respect to the circumferential direction Y. In this way, the drain hole 3a is formed such that its central axis C is inclined by 30° (angle α) in the radial direction H and by an angle β in the circumferential direction Y, so that as shown in FIG. 10, the disk temperature can be reduced and the heat dissipation effect is higher than that of the prior art.

[0036] More specifically, in the case of a brake disk having a drain hole 3a in which the central axis C extends perpendicular to the surface (one surface Sa or the other surface Sb) as in the prior art (i.e., not inclined), when measuring the temperature of the brake disk 1 having a drain hole 3a in which the central axis C is inclined by 30° (angle α) in the radial direction H and by an angle β in the circumferential direction Y in a use environment where the temperature is about 253°C, the result as shown in FIG. 10 was obtained.

[0037] Therefore, according to FIG. 10, the brake disk 1 having a drain hole 3a in which the central axis C is inclined by 30° (angle α) in the radial direction H and by an angle β in the circumferential direction Y has a lower disk temperature and a higher heat dissipation effect than the conventional brake disk. In particular, when the inclination angle β is 0° (i.e., the inclination angle β with respect to the circumferential direction Y is 0°), it can be seen that the disk temperature is the lowest and the heat dissipation effect is the highest.

[0038] Next, a method for manufacturing the brake disk 1 according to the present embodiment will be described. As shown in FIG. 11, the brake disk 1 according to the present embodiment is placed on the die D while inclining the blank material B by a predetermined angle γ, and the punch P is lowered in the vertical direction with respect to the blank material B to perform through-hole machining, thereby forming drain holes 3a that penetrate the disk at a plurality of locations in the pressing region of the brake pad 5.

[0039] Here, in the present embodiment, the mounting surface Da of the die D is inclined at a predetermined angle γ. As a result, a drain hole 3a can be formed in which the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset at least in the radial direction H of the disk. Note that by arbitrarily changing the position of the punch P with respect to the blank material B, a drain hole 3a with an arbitrary inclination angle can be obtained.

[0040] Also, as shown in FIG. 12, while placing the blank material B horizontally on the die D, the punch P is lowered while being inclined at a predetermined angle γ with respect to the blank material B to perform through-hole machining, so that drain holes 3a penetrating the disk are formed at a plurality of locations in the pressing region of the brake pad 5. Even in this case, a drain hole 3a can be formed in which the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset at least in the radial direction H of the disk.

[0041] According to the above embodiment, a plurality of drain holes 3a penetrating from one surface Sa to the other surface Sb are formed in a predetermined region extending in the circumferential direction, and the drain holes 3a are positioned such that the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset at least in the radial direction H of the disk, so that the heat dissipation effect can be further improved.

[0042] In particular, if the drain hole 3a is formed such that the center line C connecting the center position of the opening 3aa on one surface Sa and the center position of the opening 3ab on the other surface Sb extends in a direction intersecting the rotation axis X of the disk and the center line C is inclined at an angle of 10 to 30° with respect to the direction orthogonal to the disk surface, the heat dissipation effect can be further improved. Also, if the drain hole 3a is positioned such that the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset in the radial direction H and the circumferential direction Y of the disk, a brake disk 1 having an arbitrary heat dissipation effect can be easily obtained.

[0043] Furthermore, the brake disk to be applied includes a bracket portion 2 attached to the vehicle axle, a disk portion 3 against which a brake pad 5 is pressed, and a connecting means 4 that connects the bracket portion 2 and the disk portion 3 so as to be relatively movable. Since the drain hole 3a is formed in the disk portion 3, the heat dissipation effect of the floating type brake disk 1 in which the bracket portion 2 and the disk portion 3 are separately configured can be improved.

[0044] Furthermore, while placing the blank material B on the die D while tilting it at a predetermined angle γ, the punch P is lowered in the vertical direction with respect to the blank material B for through-hole machining, or the blank material B is placed on the die D, and the punch P is lowered while tilting it at a predetermined angle γ with respect to the blank material B for through-hole machining. By doing so, drain holes 3a that penetrate the disk are formed at a plurality of locations in the pressing region of the brake pad 5, and the drain holes 3a are positioned such that the opening 3aa formed on one surface Sa and the opening 3ab formed on the other surface Sb are offset at least in the radial direction H of the disk. Therefore, the brake disk 1 with improved heat dissipation effect can be easily manufactured. In particular, if the mounting surface Da of the die D is inclined at a predetermined angle, the brake disk 1 with improved heat dissipation effect can be easily and surely manufactured.

[0045] As described above, the present embodiment has been described, but the present invention is not limited thereto. For example, instead of the floating type brake disk 1 in which the bracket portion 2 and the disk portion 3 are separately configured, it may be applied to an integral type brake disk (so-called solid type). Also, the drain hole 3a may be formed by another processing device such as a laser processing machine instead of the through-hole processing device having the punch P.

Industrial Applicability

[0046] A plurality of drain holes penetrating from one surface to the other surface are formed in a predetermined region extending in the circumferential direction, and the drain holes are formed in a brake disk in which the opening formed on one surface and the opening formed on the other surface are offset at least in the radial direction of the disk. It may be of other shapes or have other functions, etc.

Explanation of symbols

[0047] 1 Brake disk 2 Bracket part 2a Mounting hole 3 Disk part 3a Drain hole 3aa Opening on one surface 3ab Opening on the other surface 4 Connecting means 5 Brake pad 6 Caliper 7 Piston Sa One surface Sb The other surface X Rotation axis Y Circumferential direction H Radial direction C Center line B Blank material D Die Da Placing surface P Punch

Claims

1. A brake disk attached to an axle of a vehicle and configured to brake the vehicle by pressing brake pads, wherein a plurality of drain holes penetrating from one surface to the other surface are formed in a predetermined region extending in the circumferential direction, and the drain holes are positioned such that openings formed in one surface and openings formed in the other surface are offset at least in the radial direction of the disk, and a center line connecting the center position of the opening in one surface and the center position of the opening in the other surface extends in a direction intersecting the rotation axis of the disk.

2. The brake disk according to claim 1, wherein the drain holes are formed such that the center line is inclined at an angle of 10 to 30° with respect to the rotation axis.

3. A brake disk comprising a bracket portion attached to an axle of a vehicle, a disk portion against which the brake pads are pressed, and connecting means for connecting the bracket portion and the disk portion so as to be relatively movable, wherein the drain holes are formed in the disk portion.

4. A method for manufacturing a brake disk attached to an axle of a vehicle and configured to brake the vehicle by pressing brake pads, wherein a blank material is placed on a die while being inclined at a predetermined angle, and a punch is lowered vertically with respect to the blank material to perform through-hole machining, or the blank material is placed horizontally on the die and the punch is lowered while being inclined at a predetermined angle with respect to the blank material to perform through-hole machining, thereby forming a plurality of drain holes penetrating the disk at a plurality of locations in the pressing region of the brake pads, and the drain holes are positioned such that openings formed in one surface and openings formed in the other surface are offset at least in the radial direction of the disk, and a center line connecting the center position of the opening in one surface and the center position of the opening in the other surface extends in a direction intersecting the rotation axis of the disk.

5. The manufacturing method of the brake disc according to claim 4, characterized in that the mounting surface of the die or the punch is inclined at a predetermined angle.

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