JP2009250330A - Brake disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brake disk which can sufficiently relax thermal stress associated with thermal expansion deformation of a braking part. <P>SOLUTION: The brake disk 100 is provided with a mounting part 10 and the braking part 20. The mounting part 10 is used for mounting the brake disk 100 on a wheel, and the braking part 20 is positioned on the outer periphery of the mounting part 10. A brake pad 40 is brought into slide contact with the braking part 20 which has at least one arch combination body 60. The arch combination body 60 is constituted by an outer arch part 22 and an inner arch part 26. The bulky shaped outer arch part 22 is projected to the outside of the braking part 20 in the radial direction (R), and the bulky shaped inner arch part 26 positioned inside the outer arch part 22 is projected to the inside of the braking part 20 in the radial direction (R). A through-hole 28 which penetrates both sides of the braking part 20 is formed in the area surrounded by the outer arch part 22 and the inner arch part 26. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brake disk, and more particularly to a brake disk for a saddle-ride type vehicle.

In motorcycles, brake disks are widely used as vehicle control devices. In this brake disk device, a brake disk is mounted on a wheel hub of a front wheel or a rear wheel of a vehicle, a caliper with a built-in brake pad is provided on the body frame side of the outer periphery of the brake disk, and the brake pad is braked by a hydraulic piston. The rotation is braked by the friction between the two sides.
In this type of brake disk device, there has been known one in which a cleaning mechanism is provided on the braking surface of the brake disk, and the friction surface of the brake pad is automatically cleaned by the cleaning mechanism when the brake disk is operated.
For example, Patent Literature 1 discloses an outer cleaning groove that opens a radially outer end and cleans a radially outer region of a friction surface on a braking surface of a brake disk on which a friction surface of a brake pad rubs, and a radius. There is disclosed a brake disk having an inner cleaning groove for closing a radially outer end and cleaning a radially inner region of a friction surface. According to this configuration, the cleaning area for the brake pad friction surface can be satisfactorily cleaned by sharing the cleaning area for the friction surface of the brake pad between the outer cleaning groove and the inner cleaning groove.
JP 2001-182664 A

However, the brake disc disclosed in Patent Document 1 does not take into account the temperature increase of the brake disc due to frictional heat during friction of the brake pads. For this reason, when the brake disk thermally expands due to frictional heat, thermal deformation such as warping of the brake disk may occur. In particular, the brake disk disclosed in Patent Document 1 is provided with a cleaning groove having a large opening on the braking surface of the brake disk. Therefore, it is difficult to maintain the rigidity of the brake disk, and the possibility of causing the above-described thermal deformation becomes higher.
The present invention has been made in view of such a point, and a main object thereof is to provide a brake disk that can sufficiently relieve thermal stress accompanying thermal expansion deformation of the brake disk.

  A brake disc provided by the present invention includes an attachment portion for attachment to a wheel, and a braking portion that is located on the outer periphery of the attachment portion and that is brought into sliding contact with a brake pad. The braking part has at least one arch combination. The arch combination includes an outer arch portion projecting radially outward of the braking portion, and an arch shape positioned inward of the outer arch portion and projecting radially inward of the braking portion. It is comprised from the inward arch part which exhibits. And the through-hole which penetrates the front and back of the said braking part is formed in the area | region enclosed by the said outer arch part and the said inner arch part.

  According to the brake disc provided by the present invention, when the brake portion of the brake disc thermally expands due to frictional heat generated when the brake pad is rubbed, the outer arch portion and the inner arch portion projecting in the radial direction of the brake portion. Are elastically deformed (for example, the bow-shaped warpage of each arch portion is greatly bent), and thereby the thermal stress due to the thermal expansion of the brake disk can be relieved. Thereby, thermal expansion of the brake disc in the circumferential direction can be allowed, and deformation (for example, vibration, warpage, etc.) of the brake disc in the thickness direction due to thermal expansion can be suppressed. In addition, the through-hole formed by the outer arch portion and the inner arch portion can be used as a cleaning hole for the brake pad. That is, the brake pad wear powder and earth and sand adhering to the brake pad can be scraped off by the through hole penetrating the front and back of the braking portion.

  Embodiments according to the present invention will be described below with reference to the drawings. In the following drawings, members / parts having the same action are described with the same reference numerals. In addition, this invention is not limited to the following embodiment.

  A brake disc according to Embodiment 1 of the present invention will be described with reference to FIG. Fig.1 (a) is a front view which shows typically the structure of the brake disc 100 of this embodiment.

  As shown in FIG. 1A, the brake disc 100 includes an attachment portion 10 for attachment to a wheel (not shown) and a braking portion 20 with which the brake pad 40 is slidably contacted. The attachment portion 10 corresponds to a fixing portion for attaching the brake disc 100 to the wheel. In this embodiment, four mounting portions 10 are provided on the inner peripheral side of the brake disc 100 and are arranged so as to be even on the same circle. Each attachment portion 10 has an attachment hole 12 formed therein. For example, a pin or the like may be used as long as it is not limited to the attachment hole 12 and can be attached to the wheel.

  A brake portion 20 is formed on the outer periphery of the attachment portion 10. The braking unit 20 is a predetermined area of the brake disc 100 that generates a frictional force when the brake pad 40 comes into sliding contact. In the illustrated example, the brake part 20 includes a portion included in the sliding contact area with the brake pad 40 and the sliding contact. It is comprised from the part which remove | deviates from the area | region outward, and the part which remove | deviates inward from this sliding contact area | region. In this embodiment, the braking portion 20 is provided on the outer peripheral side of the brake disc 100 and is formed in an annular shape surrounding the outside of each mounting portion 10. Moreover, the braking part 20 and the attachment part 10 are integrally formed by pressing a SUS material.

  The braking unit 20 has at least one arch combination 60. The arch combination 60 is positioned inward of the outer arch portion 22, which has an arcuate shape protruding outward in the radial direction (R) of the braking portion 20, and in the radial direction (R of the braking portion 20. And an inner arch portion 26 having an arcuate shape projecting inwardly. In this embodiment, the outer arch portion 22 and the inner arch portion 26 are connected to each other by an arch connecting portion 21 that constitutes a part of the braking portion 20.

  A through hole 28 is formed in a region surrounded by the outer arch portion 22 and the inner arch portion 26. The through hole 28 penetrates the front and back of the braking portion 20, and in this embodiment, has a long hole shape extending in the circumferential direction of the braking portion 20. In this embodiment, a plurality of arch combinations 60 are arranged in the circumferential direction of the braking unit 20 (eight in the figure). The plurality of arch combinations 60 are connected to each other via the arch coupling portions 21.

As shown in FIG. 1B, the inner surface of the outer arch portion 22 is offset to the outer peripheral side by a predetermined amount D1 (for example, 6 mm) from the center reference line C1 connecting the arch connecting portions 21. When the brake part 20 is thermally expanded in the circumferential direction when the brake disk is operated, the bow part warps in a direction 92 in which the bow warpage increases (that is, D1 further increases).
On the other hand, the inner surface of the inner arch portion 26 is offset to the inner peripheral side by a predetermined amount D2 (for example, 8 mm) from the center reference line C1 connecting the arch connecting portions 21. When the brake part is thermally expanded in the circumferential direction when the brake disk is operated, it is bent in the direction 94 in which the bow warpage increases (that is, D2 further increases).
Further, in this embodiment, the outer arch portion 22 is composed of a portion included in the sliding contact area with the brake pad 40 and a portion coming outward from the sliding contact region, while the inner arch portion 26 is The portion includes a portion included in the sliding contact area with the brake pad 40 and a portion that is inwardly removed from the sliding contact region.

  Further, the operation of the brake disc 100 will be described in detail with reference to FIG. FIG. 1B is an enlarged view of a main part schematically showing deformation of the brake disc 100 during braking. When the brake pad 40 is brought into sliding contact with the braking unit 20 while the brake disc 100 is rotating, a braking force is applied to the braking unit 20 by a frictional force generated during that time. This braking force can brake the rotation of a wheel (not shown) via the brake disc 100.

At that time, the frictional heat generated between the brake pad 40 and the braking unit 20 raises the temperature of the braking unit 20, and the brake disc 100 (braking unit 20) thermally expands in the circumferential direction. When the brake disk 100 is thermally expanded in this manner, the outer arch portion 22 and the inner arch portion 26 are each in a direction in which the bow-shaped (arch-shaped) warpage increases as shown by the phantom lines in FIG. Bends to relieve the thermal stress.
In this embodiment, the outer arch portion 22 and the inner arch portion 26 are bent in opposite directions. That is, the outward arch portion 22 is curved so as to protrude further outward in the radial direction (R) of the braking portion 20 and moves outward in the radial direction (R) of the braking portion 20 (arrow “92”). "reference). On the other hand, the inward arch portion 26 is curved so as to protrude further inward in the radial direction (R), and moves inward in the radial direction (R) (see arrow “94”).

  Thus, according to the brake disc 100 of the present embodiment, when the braking portion 20 of the brake disc 100 thermally expands due to frictional heat generated when the brake pad 40 is rubbed, the brake disc 100 protrudes in the radial direction (R) of the braking portion 20. The outer arch portion 22 and the inner arch portion 26 that have been deformed are elastically deformed (here, the bow-shaped warpage of each arch portion 22, 26 is greatly deflected), thereby relieving thermal stress due to thermal expansion of the brake disk 100. can do. Thereby, thermal expansion in the circumferential direction of the brake disc 100 can be allowed, and deformation (for example, vibration, warpage, etc.) in the thickness direction of the brake disc 100 due to thermal expansion can be suppressed.

  In this embodiment, as indicated by arrows “92” and “94” in FIG. 1B, the outer arch portion 22 and the inner arch portion 26 move (deform) in opposite directions. It is configured. In this way, the two arch portions 22 and 26 that move (deform) in opposite directions cooperate and deform, so that the thermal stress accompanying the thermal expansion change can be effectively relieved. In addition, in the structure in which the thermal stress is alleviated by only one of the outer arch portion 22 and the inner arch portion 26, it is difficult to maintain the strength of the brake disc. The strength of the brake disc can be sufficiently maintained by the cooperative operation of the inner arch portion 26 and the inner arch portion 26.

  Furthermore, in this embodiment, the braking part 20 and the attachment part 10 are integrally formed by pressing a SUS material. Thus, in the brake disc 100 (for example, a solid brake disc) in which the braking portion 20 and the mounting portion 10 are integrally formed, the brake disc (for example, a floating brake disc) in which the braking portion 20 and the mounting portion 10 are configured as separate members. There are few places which can move at the time of thermal expansion, and therefore, relaxation of thermal stress tends to be difficult. Therefore, in the brake disc 100 in which the braking portion 20 and the mounting portion 10 are integrally formed, the effect of adopting the configuration of the present embodiment in which the arch portions 22 and 26 having thermal deformation relaxation ability are formed in the braking portion 20. Can be particularly well demonstrated.

In addition, the curvature of each arch part 22,26, the length of each arch part 22,26, the shape of each arch part 22,26, etc. are the heat-deformability required for each arch part 22,26, and each arch part. It can be appropriately determined depending on a suitable balance in consideration of the strength required for 22 and 26.
The outer arch portion 22 and the inner arch portion 26 may be formed so as to draw an arc with a constant curvature, or may be formed so as to be curved while changing the curvature. In this embodiment, the outer arch portion 22 and the inner arch portion 26 are formed to be curved with different curvatures depending on the respective arch portions.
Further, in this embodiment, the outer arch portion 22 and the inner arch portion 26 have a linear shape in the rotational direction with respect to the radial axis (R) passing through the maximum diameter point of the outer arch portion 22. It is formed to be symmetric.

  Furthermore, another characteristic part of the brake disc 100 of the present embodiment will be described. In the configuration of the present embodiment, the through hole 28 formed by the outer arch portion 22 and the inner arch portion 26 can be used as a cleaning hole for the brake pad 40. That is, the brake pad wear powder and earth and sand adhering to the brake pad 40 can be scraped off by the through hole 28 penetrating the front and back of the braking portion 20. The through hole 28 surrounded by the two arch portions 22 and 26 has a larger opening area than a cleaning hole formed in a braking portion of a typical brake pad. Therefore, the inside of the through hole 28 is less likely to be clogged with earth and sand, and it is possible to reliably avoid wear of the brake pad 40 due to earth and sand clogging.

  The through hole 28 may have any shape as long as it can exhibit a cleaning action, but preferably has a long hole shape extending in the circumferential direction of the braking portion 20 as shown in FIG. Thus, by making the through hole 28 into a long hole shape extending in the circumferential direction, when the outer arch portion 22 and the inner arch portion 26 are elastically deformed, the brake pad 40 is placed in the opening of the through hole 28. It is possible to avoid the problem of fitting and to operate the brake pad 40 and the brake disc 100 stably. In this embodiment, the opening edge portion (the inner surface of the outer arch portion 22 and the inner surface of the inner arch portion 26) that defines the through hole 28 is the outer surface 23 of the outer arch portion 22 and the inner arch portion 26. A similar shape is formed with respect to the outer surface 27.

  In addition to the through hole 28, the outer surface 23 of the outer arch portion 22 and the outer surface 27 of the inner arch portion 27 may be used as a cleaning scraper for the brake pad 40. That is, the outer sand 23 on the outer peripheral side of the brake pad 40 can be scraped off by the outer surface 23 of the outer arch portion 22 curved so as to protrude further outward than the other portions of the braking portion 20. Moreover, the outer sand 27 on the inner peripheral side of the brake pad 40 can be scraped off by the outer surface 27 of the inner arch portion 26 curved so as to protrude further inward than the other portions of the braking portion 20. According to such a configuration, cleaning of the sliding contact surface of the brake pad 40 can be shared by the through hole 28, the outer surface 23 of the outer arch portion 22, and the outer surface 27 of the inner arch portion 26. Cleaning can be performed efficiently and effectively.

  Further, only one arch combination 60 may be formed in the braking portion 20, or a plurality of arch combination bodies 60 may be formed in the circumferential direction of the braking portion 20. In this embodiment, the plurality of arch combinations 60 are arranged so as to be point-symmetric with each other with respect to the central axis (C) of the brake disc 100 (at equal intervals on the same circle). Thus, the cleaning effect of the brake pad 40 can be further improved by making the number of the arch combination bodies 60 plural. In addition, since the plurality of arch combinations 60 arranged symmetrically in a point-symmetric manner are deformed in cooperation, the thermal stress accompanying the thermal expansion change can be alleviated evenly, and the deformation of the brake disk can be further effectively suppressed. can do.

At least one of the plurality of arch combination bodies 60 (here, the arch combination body 60a) may be connected to the mounting portion 10 via the arm 50 extending in the radial direction (R) of the braking portion 20. Good. In the illustrated example, the inner arch portion 26 a of the four arch combination bodies 60 a is connected to the mounting portion 10 via the arm 50 extending in the radial direction (R) of the braking portion 20.
In this case, when the braking portion 20 is thermally expanded, as shown by the phantom line in FIG. 1B, the inner arch portion 26a on the connected side bends in a direction in which the bow-shaped (arch-shaped) warpage increases. It moves outward in the radial direction (R) (see arrow “96”). This is because the mounting portion 10 is bolted to the wheel, so that the inward movement of the inner arch portion 26a connected to the mounting portion 10 in the radial direction (R) is restricted. Thus, even when the outer arch portion 22a and the inner arch portion 26a move (deform) in the same direction, the pair of arch portions 22a, 26a cooperate to elastically deform (bow-shaped warpage). Can be sufficiently relieved of thermal stress accompanying thermal expansion change.

  Next, the configuration of this embodiment will be further described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A is a perspective view of a front wheel portion of a vehicle (motorcycle) to which the brake disk 100 of the present embodiment is applied, and FIG. 2B shows a brake system provided on the front wheel. FIG.

  A brake disc 100 shown in FIG. 1 (a) is a brake disc applied to a motorcycle and has a thin-walled circular disk structure. The brake disc 100 can be applied to other vehicles as well as motorcycles. For example, in addition to motorcycles, so-called straddle-type vehicles (snowmobiles, four-wheel buggies (ATV: All Terrain Vehicles) )) Etc.). The motorcycle in the present embodiment means a motorcycle and includes a motorbike and a scooter, and specifically refers to a vehicle that can turn by tilting the vehicle body. Therefore, even if at least one of the front wheels and the rear wheels is two or more and the number of tires is counted as a tricycle / four-wheel vehicle (or more), it can be included in the “motorcycle”.

  As shown in FIG. 2A, the brake disc 100 is attached coaxially with the axle of the wheel 70 (see FIG. 2A) and rotates together with the wheel 70. The brake disc 100 is attached to one side or both sides of the wheel 70 depending on the vehicle type. Specifically, on the wheel 70 side, four female screw portions are equally provided in advance on the same circle, and each of the female screw portions and the mounting hole 12 (circular hole in the figure) of the mounting portion 10 are coaxially overlapped. In the state, both are fastened with bolts (not shown). As a result, the brake disc 100 is fixed to the wheel 70.

  As shown in FIG. 2B, the caliper 72 is disposed so as to sandwich the outer peripheral edge of the brake disc 100 (the braking portion 20 in FIG. 1). The caliper 72 includes a pair of brake pads 40 in the caliper body 74, and the brake pads 40 face both surfaces of the brake disc 100. The brake pads 40 are attached to the tips of caliper pistons 78 supported by the caliper bodies 74, respectively.

  The caliper piston 78 is supplied with oil of a predetermined pressure from the brake hose 80, and when the pressure increases, the caliper piston 78 is pressed in a direction approaching each other. As a result, the pair of brake pads 40 are configured to sandwich the brake disc 100 by hydraulic pressure. This clamping state is a state where a brake is applied, and a braking force is applied to the brake disc 100 rotating at high speed together with the wheels.

  Taking the front wheel brake of a motorcycle as an example, the brake operation will be described as follows. That is, as shown in FIG. 2B, when the brake lever 82 is rotated in the direction of arrow F by gripping force (holding the brake lever 82), the piston 84A of the master cylinder 84 is pressed in the direction of arrow A. At this time, the force (pressure) that pushes the piston 84A is increased by a lever ratio (L1 / L2 shown in FIG. 2B) times the grip force F of the brake lever.

  This lever ratio is determined by the distance (L2) between the offset amount (L1) between the rotating shaft 82A of the brake lever 82 and the axis of the master cylinder 84 and the force point to which the gripping force F is applied from the rotating shaft 82A of the brake lever 82. It is a so-called lever ratio. The hydraulic pressure generated by pressing the piston 84 </ b> A of the master cylinder 84 becomes a force for pressing the caliper piston 78 through the brake hose 80.

  In the brake system configured as described above, when the driver grips the brake lever 82 in order to apply braking while the wheel 70 is rotating at high speed, the brake pad 40 holds the brake disc 100, and the rotational speed of the wheel 70 is reduced by sliding friction. Is done. In the process, the brake disc 100 generates heat due to friction. The brake disk 100 is thermally expanded and deformed by this heat.

  At that time, the outer arch portion 22 and the inner arch portion 26 of the braking portion 20 are configured to bend in the direction in which the bow-shaped warpage increases, so that the outer arch portion 22 and the inner arch portion 26 try to be deformed as the braking portion 20 is thermally expanded. To do. Therefore, when the brake portion of the brake disk generates heat due to braking and undergoes thermal expansion deformation extending in the circumferential direction, distortion does not accumulate in the brake disk, so that plastic deformation of the brake disk can be prevented.

  Below, the modification in this Embodiment is shown. As described above, the same components as those of the above-described embodiment are denoted by the same reference numerals, and description of the configuration is omitted.

(Modification 1)
As shown in FIG. 3, in the brake disc 100 </ b> A of the first modification, the attachment portion 10 </ b> A is directly connected to the inner arch portion 26 </ b> Aa of the braking portion 20 </ b> A without the arm 50. According to such a configuration, the mounting portion 10A is disposed closer to (for example, adjacent to) the braking portion 20A than when the arm is interposed between the braking portion and the mounting portion (for example, the embodiment of FIG. 1). be able to.

  If the braking force from the brake pad applied to the braking portion 20A during the braking operation is the same, the magnitude of the load applied to the mounting portion 10A is the distance between the mounting portion and the braking portion in the radial direction (R) of the brake disc. It is decided by what. Therefore, like the brake disk of the first modification, by arranging the mounting portion 10A near (for example, adjacent to) the braking portion 20A, the load applied to the mounting portion 10A during the braking operation can be reduced. The rigidity of the mounting portion 10A, and hence the brake disc 100A, can be ensured.

Moreover, as a typical measure against thermal deformation of a brake disc, a thermal deformation relaxation mechanism having thermal deformation relaxation capability is often provided between the mounting portion and the braking portion. When 10A approaches (for example, adjacent to) the braking portion 20A, it is difficult to design a thermal deformation relaxation mechanism between the mounting portion 10A and the braking portion 20A. Therefore, in the brake disc 100A in which the mounting portion 10A is disposed in the vicinity of the braking portion 20A, the braking portion 20A itself has an arch combination 60A (outer arch portion 22A and inner arch portion 26A) having thermal deformation mitigation ability. The effect of adopting the configuration of the present embodiment to form can be exhibited particularly well.
The means for disposing the mounting portion 10A in the vicinity of the braking portion 20A is not limited to directly connecting the braking portion 20A and the mounting portion 10A described above without using an arm, for example, shortening the length of the arm. Or by tilting the arm with respect to the radial direction (ie, extending the arm from the mounting portion in a direction different from the radial direction to reach the braking portion), the formation position of the mounting portion 10A is brought closer to the braking portion 20A. May be.

(Modification 2)
A plurality of small holes may be formed in the brake disc. As shown in FIG. 4, the brake disk 100B according to the second modification includes a plurality of small holes 90 in the braking portion 20B. The small holes 90 may improve the heat dissipation of the brake disc. The small hole 90 is not limited to a circular shape, and may have another shape. In the brake disk 100B of the second modification, the two arch combination bodies 60B are formed so as to be point-symmetric with each other.

(Modification 3)
Furthermore, from the viewpoint of increasing the strength of the brake disc, the number of arms (reinforcing arms) that connect the attachment portion and the braking portion may be increased. For example, as shown in FIG. 5, the brake disc 100C according to the third modification is characterized in that all the arch combinations 60Ca are connected to any one of the attachment portions 10C via the reinforcing arm 50C. . It is sufficient that the reinforcing arm 50C has a minimum width and shape sufficient to connect the mounting portion 10C and the arch combination 60Ca, and the shape and width of the reinforcing arm 50C is a deformation of the arch combination 60Ca. It is set to an appropriate value for substantially maintaining the performance. By providing a large number of reinforcing arms 50C in this way, the rigidity of the braking portion 20C can be increased.

  Further, the brake disk 100C according to the modified example 3 includes an annular hub 52C that connects the attachment portion 10C and the attachment portion 10C adjacent thereto. With this annular hub 52C, a certain attachment portion 10C and another attachment portion 10C adjacent thereto are connected to improve the rigidity of the attachment portion 10C. The presence of the reinforcing arm 50C and the annular hub 52C can improve the strength against the eccentricity and distortion of the brake disk 100C when an external impact (for example, overturning) is applied to the brake disk 100C. .

(Modification 4)
In the above-described embodiment, a plurality of arch combinations 60 (two points (FIG. 4), eight points (FIGS. 1 and 3), and twelve points (FIG. 5)) are used, but the number is not limited to this number. Absent. For example, depending on the configuration of the brake disk, the arch combination 60 may be singular. The modification 4 is shown in FIG. In the brake disk 100D according to the fourth modification, only one arch combination 60D including a combination of the outer arch portion 22D and the inner arch portion 26D is formed in the braking portion 20D.

(Modification 5)
Moreover, in the modification 5 of FIG. 7, all the arch combination bodies 60E have shown the example which became independent from the attaching part 10E. In this example, there is no reinforcing arm that directly connects the arch combination 60E and the mounting portion 10E. That is, all the arch combination bodies 60E are arch portions independent of the attachment portion 10E.

(Modification 6)
Further, FIG. 8 shows a brake disc 100F according to Modification 6. In this example, the through hole 28F surrounded by the outer arch portion 22F and the inner arch portion 26F has a circular hole shape, that is, an opening edge portion that defines the through hole 28F (the inner surface of the outer arch portion 22F and the inner surface). The inner surface of the inner arch portion 26F has non-similar shapes with respect to the outer surface 23F of the outer arch portion 22F and the outer surface 27F of the inner arch portion 26F.

As described above, according to the brake disc of the present invention, when the braking portion of the brake disc is thermally expanded due to frictional heat generated when the brake pad is rubbed, the outer arch portion protruding in the radial direction of the braking portion and the inner The thermal stress caused by the thermal expansion of the brake disk can be reduced by elastically deforming the arch portion (for example, the bow-shaped warpage of each arch portion is greatly bent). Thereby, thermal expansion of the brake disc in the circumferential direction can be allowed, and deformation (for example, vibration, warpage, etc.) of the brake disc in the thickness direction due to thermal expansion can be suppressed.
In addition, the through-hole formed by the outer arch portion and the inner arch portion can be used as a cleaning hole for the brake pad. That is, the earth and sand adhering to a brake pad can be scraped off by the through-hole which penetrates the front and back of a braking part. The through-hole surrounded by the two arch portions has a larger opening area than a cleaning hole formed in a braking portion of a typical brake pad. Therefore, it becomes difficult to clog the earth and sand inside the through hole, and it is possible to reliably avoid wear of the brake pad due to the clogging of earth and sand.

  As mentioned above, although this invention has been demonstrated by suitable embodiment and the modifications 1-5, such description is not a limitation matter and of course various modifications are possible.

  ADVANTAGE OF THE INVENTION According to this invention, the brake disk which can fully relieve | moderate the thermal stress accompanying the thermal expansion deformation of a brake part, and a vehicle provided with the brake disk can be provided.

(A) is a front view which shows typically the structure of the brake disc of this embodiment. (B) is a principal part enlarged view which shows typically a deformation | transformation of the brake disc at the time of braking. (A) is a perspective view of a front wheel portion of a vehicle (motorcycle) to which the brake disk of the present embodiment is applied. (B) is the schematic which shows the brake system provided in the front wheel. It is a front view of a brake disc concerning modification 1 of an embodiment of the present invention. It is a front view of a brake disc concerning modification 2 of an embodiment of the present invention. It is a front view of a brake disc concerning modification 3 of an embodiment of the present invention. It is a front view of a brake disc concerning modification 4 of an embodiment of the present invention. It is a front view of a brake disc concerning modification 5 of an embodiment of the present invention. It is a front view of a brake disc concerning modification 6 of an embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Attachment part 12 Attachment hole 20 Braking part 21 Arch connection part 22, 22a Outer arch part 23 Outer arch part outer surface 26, 26a Inner arch part 27 Inner arch part outer surface 28 Through hole 40 Brake pad 50 Arm 50C Reinforcing arm 52 Annular hub 60, 60a Arch assembly 70 Wheel 72 Caliper 74 Caliper body 78 Caliper piston 80 Brake hose 82 Brake lever 82A Rotating shaft 84A Piston 84 Master cylinder 90 Small hole 100 Brake disc

Claims (11)

An attachment for attaching to the wheel;
A brake portion that is located on the outer periphery of the mounting portion and is in sliding contact with the brake pad;
The braking part has at least one arch combination,
The arch combination is
An outer arch portion having a bow shape projecting radially outward of the braking portion;
The inner arch portion is located inward of the outer arch portion, and has an arcuate inner arch portion protruding radially inward of the braking portion, and surrounded by the outer arch portion and the inner arch portion. The brake disc is formed with a through-hole penetrating the front and back of the braking portion in the region.   At least one of the outer arch portion and the inner arch portion is formed such that the front and rear shapes in the rotational direction are axisymmetric with respect to the radial axis passing through the maximum diameter point of the outer arch portion. The brake disc according to claim 1, wherein   2. The brake disk according to claim 1, wherein the outer arch portion and the inner arch portion are configured to bend in a direction in which the bow warpage is increased by thermal expansion during braking of the braking portion.   The brake disk according to claim 1, wherein a through hole formed by the outer arch portion and the inner arch portion has a long hole shape extending in a circumferential direction of the braking portion.   2. The brake disk according to claim 1, wherein an opening edge portion that defines the through hole has a similar shape to at least one of an outer surface of the outer arch portion and an outer surface of the inner arch portion. A plurality of the arch combinations are arranged in the circumferential direction of the braking portion,
The brake disc according to claim 1, wherein the plurality of arch combinations are arranged so as to be point-symmetric with respect to a central axis of the brake disc.   The brake disk according to claim 6, wherein at least one of the plurality of arch combinations is connected to the attachment portion via an arm extending in a radial direction of the braking portion.   The brake disc according to claim 1, wherein the attachment portion and the braking portion are integrally formed.   The brake disk according to claim 1, wherein the attachment portion is disposed so as to be close to the braking portion.   The brake disk according to any one of claims 1 to 9, wherein the brake disk is a brake disk for a straddle-type vehicle.   A vehicle comprising the brake disc according to any one of claims 1 to 9.

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