BRAKING SYSTEM FOR MUSCLE-POWERED VEHICLE

Abstract

A brake system comprises a brake caliper and a disc brake rotor. The brake caliper includes a caliper body, a first brake pad, and a first piston. The brake caliper body includes a first piston chamber and a slot. The disc brake rotor is rotatable relative to the brake caliper about an axis of rotation. The disc brake rotor is configured to be at least partially positioned within the slot. The disc brake rotor includes a friction section that is in contact with the first brake pad to receive a braking force from the first brake pad. The slot has a slot width defined in an axial direction along the axis of rotation. The friction section has a rotor width defined in the axial direction. A first ratio between the slot width and the rotor width is less than 1.8.

Description

BACKGROUND TECHNICAL AREA

[0001] The present invention relates to a braking system for a muscle-powered vehicle. BACKGROUND INFORMATION

[0002] A muscle-powered vehicle includes a braking system. The braking system includes a brake caliper and a brake rotor. The brake caliper includes a caliper link, a piston, and a brake pad. The caliper link includes a slot in which the brake rotor is at least partially provided. In the event that the brake pad is worn, it can enter a space defined between the brake rotor and an inner surface of the slot. This allows the brake pad to be replaced with a new one at an earlier time. One objective of the present disclosure is to improve the durability of the system. SUMMARY

[0003] According to a first aspect of the present invention, a braking system of a human-powered vehicle comprises a brake caliper and a disc brake rotor. The brake caliper includes a caliper body, a first brake pad, and a first piston. The caliper body includes a first piston chamber and a slot. The brake pad is movable relative to the caliper body. The first piston is movably provided within the first piston chamber. The disc brake rotor is rotatable relative to the brake caliper about an axis of rotation. The disc brake rotor is configured to be at least partially positioned within the slot. The disc brake rotor includes a friction section that is in contact with the first brake pad to absorb or receive a braking force from the first brake pad. The slot has a width defined in an axial direction along the axis of rotation.The friction section has a rotor width defined in the axial direction. A first ratio between the slot width and the rotor width is less than 1.8.

[0004] With the braking system as described in the first aspect, the first ratio reduces the slot width relative to the rotor width. This ratio ensures that, in a situation where at least one of the disc brake rotor and the first brake pad is worn, the first brake pad is less likely to enter the space provided between the disc brake rotor and an inner surface of the slot. Consequently, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0005] According to a second aspect of the present invention, the braking system is arranged according to the first aspect such that the first ratio is greater than or equal to 1.

[0006] The braking system, as described in the second aspect, can improve the durability of the braking system by reducing or preventing contact between the disc brake rotor and the inner surface of the slot.

[0007] According to a third aspect of the present invention, the braking system is arranged according to the first or second aspect so that the difference between the slot width and the rotor width is less than 1.5 mm.

[0008] The braking system, based on the third aspect, reliably prevents the first brake pad from entering the space provided between the disc brake rotor and the inner surface of the slot, due to the difference between the slot width and the rotor width, in the event that at least one of the disc brake rotor and the first brake pad is worn. Accordingly, it is possible to reliably increase the initial thickness of the first brake pad, thereby reliably improving the system's durability.

[0009] According to a fourth aspect of the present invention, the braking system is arranged according to the third aspect so that the difference is greater than 1 mm.

[0010] The braking system, as described in the fourth aspect, can improve the durability of the braking system while reducing or preventing contact between the disc brake rotor and the inner surface of the slot.

[0011] According to a fifth aspect of the present invention, the braking system is arranged according to the third or fourth aspect such that a second ratio of the difference to the slot width is less than 0.4.

[0012] The braking system, based on the fifth aspect, reliably prevents the first brake pad from entering the space provided between the disc brake rotor and the inner surface of the slot in a case where at least one of the disc brake rotor and the first brake pad is worn. Accordingly, it is possible to reliably increase the initial thickness of the first brake pad, thereby reliably improving the system's durability.

[0013] According to a sixth aspect of the present invention, the braking system is arranged according to the fifth aspect so that the second ratio is greater than 0.3.

[0014] With the braking system according to the sixth aspect, it is possible to improve the durability of the braking system while simultaneously reducing or preventing contact between the disc brake rotor and the inner surface of the slot.

[0015] According to a seventh aspect of the present invention, the braking system is arranged according to one of the third to sixth aspects such that a third ratio of the difference to the rotor width is less than 0.8.

[0016] The braking system, based on the seventh aspect, reliably prevents the first brake pad from entering the space provided between the disc brake rotor and the inner surface of the slot in a case where at least one of the disc brake rotor and the first brake pad is worn. Accordingly, it is possible to reliably increase the initial thickness of the first brake pad, thereby reliably improving the system's durability.

[0017] According to an eighth aspect of the present invention, the braking system is arranged according to the seventh aspect such that the third ratio is greater than 0.4.

[0018] The braking system, according to the eighth aspect, can improve the durability of the braking system while reducing or preventing contact between the disc brake rotor and the inner surface of the slot.

[0019] According to a ninth aspect of the present invention, the brake system is configured according to one of the first through eighth aspects such that the brake caliper body includes a second piston chamber. The brake caliper includes a second brake pad and a second piston. The second brake pad is movable relative to the brake caliper body. The second piston is movably provided within the second piston chamber. The friction section is in contact with the second brake pad in order to receive the braking force from the second brake pad.

[0020] With the system according to the ninth aspect, it is possible to apply a braking force to the disc brake rotor using the first brake pad, the second brake pad, the first piston, and the second piston.

[0021] According to a tenth aspect of the present invention, the braking system is configured according to one of the first to ninth aspects such that the friction section includes a first friction surface and a second friction surface provided on the rear side of the first friction surface in the axial direction. The rotor width is defined between the first friction surface and the second friction surface in the axial direction.

[0022] The braking system described in the tenth aspect can clarify the definition of the rotor width.

[0023] According to an eleventh aspect of the present invention, the braking system is configured according to one of the first to tenth aspects such that the slot includes a first slot and a second slot spaced apart from the first slot. The first slot has a first slot width defined in the axial direction. A fourth ratio of the first slot width to the rotor width is less than 1.8.

[0024] With the braking system according to the eleventh aspect, the fourth ratio reduces the slot width relative to the rotor width. This reduces the likelihood of the first brake pad entering the space provided between the disc brake rotor and the inner surface of the slot, should at least one of the disc brake rotor and the first brake pad be worn. Consequently, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0025] According to a twelfth aspect of the present invention, the braking system according to the eleventh aspect is configured such that the second slot has a second slot width defined in the axial direction. A fifth ratio of the second slot width to the rotor width is less than 1.8.

[0026] With the braking system based on the twelfth aspect, the fifth ratio reduces the slot width relative to the rotor width. This reduces the likelihood of the first brake pad entering the space between the disc brake rotor and the inner surface of the slot, should at least one of the disc brake rotor and the first brake pad be worn. Consequently, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0027] According to a thirteenth aspect of the present invention, the braking system is arranged according to the eleventh or twelfth aspect such that the first slot is provided on an upstream or upstream side of the second slot in a drive direction of rotation in which the disc brake rotor rotates about the axis of rotation while the muscle-powered vehicle moves forward.

[0028] With the braking system according to the thirteenth aspect, the first slot can reduce or prevent contact between the disc brake rotor and an upstream section of the brake caliper body.

[0029] According to a fourteenth aspect of the present invention, the braking system is configured according to one of the first to thirteenth aspects such that the first brake pad is axially movable relative to the brake caliper body. The first brake pad is positioned outside the slot.

[0030] With the braking system based on the fourteenth aspect, the arrangement of the first brake pad and the slot reliably prevents the first brake pad from entering the space provided between the disc brake rotor and the inner surface of the slot in the event that at least one of the disc brake rotor and the first brake pad is worn. Accordingly, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0031] According to a fifteenth aspect of the present invention, the braking system is configured according to one of the first to fourteenth aspects such that the first brake pad has a first initial pad thickness defined in the axial direction. A sixth ratio of the slot width to the sum of the rotor width and the first initial pad thickness is less than 0.57.

[0032] With the braking system according to the fifteenth aspect, the sixth ratio reduces the slot width relative to the rotor width. This reduces the likelihood of the first brake pad entering the space provided between the disc brake rotor and the inner surface of the slot, should at least one of the disc brake rotor and the first brake pad be worn. Consequently, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0033] According to a sixteenth aspect of the present invention, the braking system is arranged according to the fifteenth aspect such that the sixth ratio is greater than or equal to 0.3.

[0034] With the braking system according to the sixteenth aspect, it is possible to improve the durability of the braking system while reducing or preventing contact between the disc brake rotor and the inner surface of the slot.

[0035] According to a seventeenth aspect of the present invention, the braking system is arranged according to the fifteenth or sixteenth aspect such that the slot width is smaller than the initial lining thickness.

[0036] With the brake system based on the seventeenth aspect, the slot width reduces the likelihood of the first brake pad entering the space provided between the disc brake rotor and the inner surface of the slot in a case where at least one of the disc brake rotor and the first brake pad is worn. Consequently, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0037] According to an eighteenth aspect of the present invention, the braking system is arranged according to one of the fifteenth to seventeenth aspects such that a seventh ratio of a difference between the slot width and the rotor width to the first initial lining thickness is less than 0.4.

[0038] With the braking system based on the eighteenth aspect, the seventh ratio reduces the slot width relative to the rotor width. This reduces the likelihood of the first brake pad entering the space provided between the disc brake rotor and the inner surface of the slot, should at least one of the disc brake rotor and the first brake pad be worn. Consequently, it is possible to increase the initial thickness of the first brake pad, thereby improving the system's durability.

[0039] According to a nineteenth aspect of the present invention, the braking system is arranged according to the eighteenth aspect such that the seventh ratio is greater than 0.2.

[0040] With the braking system according to the nineteenth aspect, it is possible to improve the durability of the braking system while reducing or preventing contact between the disc brake rotor and the inner surface of the slot.

[0041] According to a twentieth aspect of the present invention, the brake system is configured according to one of the first through nineteenth aspects such that the brake caliper body includes a recess connected to the slot. The first brake pad is at least partially provided in the recess. The recess has a defined width in the axial direction. The slot width is smaller than the recess width.

[0042] With the braking system according to the twentieth aspect, the recess can provide a space in which the first brake pad is at least partially provided.

[0043] According to a twenty-first aspect of the present invention, the braking system is configured according to one of the first to twenty aspects such that the friction section exhibits a wear tolerance. An eighth ratio of the wear tolerance to the slot width is greater than 0.1.

[0044] With the braking system based on the twenty-first aspect, the eighth ratio increases the wear tolerance of the friction section. This can improve the system's durability.

[0045] According to a twenty-second aspect of the present invention, the braking system is configured according to one of the first through twenty-first aspects such that the friction section exhibits a wear tolerance. A ninth ratio of the wear tolerance to the rotor width is greater than 0.23.

[0046] With the braking system based on the twenty-second aspect, the ninth ratio increases the wear tolerance of the friction section. This can improve the system's durability. DESCRIPTION OF THE DRAWINGS

[0047] A more complete understanding of the invention and its many associated advantages is easily achieved by referring to the following detailed description in conjunction with the accompanying drawings. Fig. Figure 1 is a side view of a muscle-powered vehicle incorporating a disc brake caliper in accordance with one embodiment. Fig. 2 is a side view of the Fig. 1. Disc brake caliper shown. Fig. Figure 3 is a cross-sectional view of the disc brake caliper, shown along line III-III of Fig. 2. Fig. Figure 4 is a cross-sectional view of the disc brake caliper, shown along line IV-IV of Fig. 2. Fig. Figure 5 is a cross-sectional view of the disc brake caliper, shown along line VV. Fig. 4. Fig. Figure 6 is a perspective cross-sectional view of the disc brake caliper, shown along line VI-VI of Fig. 4. Fig. Figure 7 is a cross-sectional view of the disc brake caliper, shown along line VII-VII of Fig. 2. Fig. Figure 8 is a cross-sectional view of the disc brake caliper, shown along line VIII-VIII of Fig. 3. Fig. Figure 9 is a cross-sectional view of the disc brake caliper, shown along line IX-IX of Fig. 2. Fig. Figure 10 is a cross-sectional view of the disc brake caliper, shown along line XX of Fig. 2. Fig. Figure 11 is a cross-sectional view of a disc brake caliper in accordance with a comparative example in a case where a brake pad is worn. Fig. Figure 12 is a cross-sectional view of the disc brake caliper, shown along line XII-XII of Fig. 2 in a case where a brake pad is worn out. DETAILED DESCRIPTION

[0048] The invention will now be described with reference to the attached drawings, wherein identical reference numerals in the different drawings denote corresponding or identical elements.

[0049] As in Fig. As shown in Figure 1, a braking system BS of a human-powered vehicle 2 is configured to be connected to an actuating device 4 via a hydraulic hose 5. The braking system BS of the human-powered vehicle 2 comprises a brake caliper 10 and a disc brake rotor 11. The actuating device 4 is configured to supply or provide hydraulic pressure to the brake caliper 10. The brake caliper 10 is configured to exert a braking force on the disc brake rotor 11 in response to the hydraulic pressure supplied by the actuating device 4. The disc brake rotor 11 is rotatably coupled to a vehicle body 2A about an axis of rotation RA. The disc brake rotor 11 is rotatable relative to the brake caliper 10 about the axis of rotation RA.

[0050] The disc brake rotor 11 rotates relative to the vehicle body 2A in a drive direction D11 while the human-powered vehicle 2 moves forward. The disc brake rotor 11 rotates relative to the vehicle body 2A in an opposite direction D12 while the human-powered vehicle 2 moves backward. The opposite direction of rotation D12 is the opposite of the drive direction D11.

[0051] In the present application, the term "muscle-powered vehicle" includes a vehicle that travels using a propulsion force that includes at least the muscle power of a user operating the vehicle. The muscle-powered vehicle includes various types of bicycles, such as a mountain bike, a racing bike, a city bike, a cargo bike, a handcycle, and a recumbent bike. Furthermore, the muscle-powered vehicle includes an electric bicycle, also known as an e-bike. An e-bike is an electrically assisted bicycle designed to assist the propulsion of a vehicle with an electric motor. However, the total number of wheels of the muscle-powered vehicle is not limited to two. For example, the muscle-powered vehicle includes a vehicle with one wheel or three or more wheels.Specifically, a muscle-powered vehicle does not include a vehicle that uses only one power source. Examples of power sources include an internal combustion engine and an electric motor. Generally, a light road vehicle, including any vehicle that does not require a driver's license to operate on a public road, is considered a muscle-powered vehicle.

[0052] As in Fig. As shown in Figure 1, the brake caliper 10 includes a brake caliper body 12. The brake caliper body 12 is designed to be mounted on the vehicle body 2A of the human-powered vehicle 2. The brake caliper body 12 is designed to be coupled to the vehicle body 2A by means of fasteners 8A and 8B, such as screws. The brake caliper body 12 is designed to be detachably and reattached to the vehicle body 2A by means of fasteners 8A and 8B. For example, the brake caliper body 12 is designed to be mounted on a front fork 2F of the vehicle body 2A. However, the brake caliper 10 can be mounted on other parts (e.g., a chainstay or a seat stay) of the vehicle body 2A if required or desired.

[0053] In the present application, the following directional terms “front”, “back”, “forward”, “backward”, “left”, “right”, “across”, “upwards”, and “downwards”, as well as any other similar directional terms, refer to those directions determined based on the user being in the user’s standard position in the human-powered vehicle 2, facing a handlebar or steering mechanism. Examples of the user’s standard position include a saddle and a seat. Accordingly, these terms, as used to describe the brake caliper 10 or other components, should be interpreted relative to the human-powered vehicle 2 equipped with the brake caliper 10 or other components when used in an upright riding position on a horizontal surface.

[0054] The term “removable and reattachable”, as used here, encompasses a configuration in which one element can be repeatedly removed from and attached to another element without significant damage.

[0055] As in Fig. As can be seen in Figure 2, the brake caliper 10 of the muscle-powered vehicle 2 includes a coupling section 13. The coupling section 13 is designed to couple the brake caliper body 12 and the vehicle body 2A of the muscle-powered vehicle 2.

[0056] The coupling section 13 comprises a first coupling section 13A and a second coupling section 13B. The second coupling section 13B is spaced apart from the first coupling section 13A. The first coupling section 13A projects away from the brake caliper body 12 and outwards from the second coupling section 13B. The second coupling section 13B projects away from the brake caliper body 12 and outwards from the first coupling section 13A.

[0057] The first coupling section 13A includes a first coupling hole 13C. The second coupling section 13B includes a second coupling hole 13D. In a coupled state where the brake caliper body 12 is mounted on the vehicle body 2A, the fastening element 8A extends through the first coupling hole 13C. In the coupled state, the fastening element 8B extends through the second coupling hole 13D. However, the structure of the coupling section 13 is not limited to the embodiment shown.

[0058] As in Fig. As shown in Figure 3, the brake caliper body 12 contains a first piston chamber 16. The brake caliper 10 contains a first piston 20. The brake caliper body 12 contains a second piston chamber 18. The first piston 20 is movably provided in the first piston chamber 16. The brake caliper 10 contains a second piston 22. The second piston 22 is movably provided in the second piston chamber 18.

[0059] The first piston 20 has a first central axis A1 and is movable relative to the brake caliper body 12 along the first central axis A1. The second piston 22 has a second central axis A2 and is movable relative to the brake caliper body 12 along the second central axis A2.

[0060] In the present embodiment, the brake caliper body 12 comprises a main body 12A, a cap 23A, a sealing element 23B, and a hole 23C. The cap 23A is coupled to the main body 12A to close the hole 23C. The cap 23A engages threadedly with the hole 23C. The main body 12A and the cap 23A define the first piston chamber 16. The sealing element 23B is positioned between the main body 12A and the cap 23A.

[0061] The brake caliper body 12 and the first piston 20 define a first hydraulic chamber 24 in the first piston chamber 16. The brake caliper body 12 and the second piston 22 define a second hydraulic chamber 26 in the second piston chamber 18.

[0062] The first central axis A1 extends through the second piston chamber 18. The second central axis A2 extends through the first piston chamber 16. In the present embodiment, the first central axis A1 coincides with the second central axis A2. However, the first central axis A1 can be offset from the second central axis A2 if required or desired.

[0063] As in Fig. As shown in Figure 3, the brake caliper body 12 includes a third piston chamber 36 and a fourth piston chamber 38. The brake caliper 10 further comprises a third piston 40 and a fourth piston 42. The third piston 40 is movably provided in the third piston chamber 36. The fourth piston 42 is movably provided in the fourth piston chamber 38.

[0064] The third piston 40 has a third central axis A3 and is movable relative to the brake caliper body 12 along the third central axis A3. The fourth piston 42 has a fourth central axis A4 and is movable relative to the brake caliper body 12 along the fourth central axis A4.

[0065] In the present embodiment, the brake caliper body 12 includes a cap 43A, a sealing element 43B, and a hole 43C. The cap 43A is coupled to the main body 12A to close the hole 43C. The cap 43A engages threadedly with the hole 43C. The main body 12A and the cap 43A define the third piston chamber 36. The sealing element 43B is positioned between the main body 12A and the cap 43A.

[0066] The brake caliper body 12 and the third piston 40 define a third hydraulic chamber 44 in the third piston chamber 36. The brake caliper body 12 and the fourth piston 42 define a fourth hydraulic chamber 46 in the fourth piston chamber 38.

[0067] The third central axis A3 extends through the fourth piston chamber 38. The fourth central axis A4 extends through the third piston chamber 36. In the present embodiment, the third central axis A3 coincides with the fourth central axis A4. However, the third central axis A3 can be offset from the fourth central axis A4 if required or desired.

[0068] As in Fig. As shown in Figure 3, the first piston 20 has a first outer diameter DM1. The second piston 22 has a second outer diameter DM2. The third piston 40 has a third outer diameter DM3. The fourth piston 42 has a fourth outer diameter DM4. In the present embodiment, the second outer diameter DM2 is equal to the first outer diameter DM1. The fourth outer diameter DM4 is equal to the third outer diameter DM3. The first outer diameter DM1 is larger than both the third outer diameter DM3 and the fourth outer diameter DM4. The second outer diameter DM2 is larger than both the third outer diameter DM3 and the fourth outer diameter DM4. However, the second outer diameter DM2 can differ from the first outer diameter DM1 if required or desired. The fourth outer diameter DM4 can differ from the third outer diameter DM3 if required or desired.The first outer diameter, DM1, can be smaller than or equal to the third outer diameter, DM3, and / or the fourth outer diameter, DM4, if required or desired. The second outer diameter, DM2, can be smaller than or equal to the third outer diameter, DM3, and / or the fourth outer diameter, DM4, if required or desired.

[0069] As in Fig. As shown in Figure 3, the brake caliper 10 includes a first brake pad 55. The first brake pad 55 is movable relative to the brake caliper body 12. The first brake pad 55 is movable relative to the brake caliper body 12 in an axial direction D2. The axial direction D2 is defined along the axis of rotation RA.

[0070] The first brake pad 55 comprises a pad 55A, a backplate 55B, and a baseplate 55C. The baseplate 55C is at least partially positioned between the pad 55A and the backplate 55B. The pad 55A is in contact with the disc brake rotor 11. The backplate 55B is in contact with the first piston 20 and the third piston 40. The pad 55A is attached to the baseplate 55C. The backplate 55B is attached to the baseplate 55C. However, the structure of the first brake pad 55 is not limited to the embodiment shown.

[0071] The brake caliper 10 includes a second brake pad 56. The second brake pad 56 is movable relative to the brake caliper body 12. The second brake pad 56 is movable relative to the brake caliper body 12 in the axial direction D2.

[0072] The second brake pad 56 comprises a pad 56A, a backplate 56B, and a baseplate 56C. The baseplate 56C is at least partially positioned between the pad 56A and the backplate 56B. The pad 56A is in contact with the disc brake rotor 11. The backplate 56B is in contact with the second piston 22 and the fourth piston 42. The pad 56A is attached to the baseplate 56C. The backplate 56B is attached to the baseplate 56C. However, the structure of the second brake pad 56 is not limited to the embodiment shown.

[0073] As in Fig. As shown in Figure 4, the brake caliper 10 includes a preload element 58. The preload element 58 is designed to preload the first brake pad 55 away from the second brake pad 56. The preload element 58 is positioned between the first brake pad 55 and the second brake pad 56.

[0074] The brake caliper 10 includes a pad shaft 60. The pad shaft 60 is coupled to the brake caliper body 12 to movably mount or support the first brake pad 55 and the second brake pad 56. The pad shaft 60 is also coupled to the brake caliper body 12 to movably mount or support the preload element 58.

[0075] In the present embodiment, the brake caliper body 12 is integrally provided as a single, one-piece component. However, the brake caliper body 12 can, if required or desired, consist of at least two separate components.

[0076] As in Fig. As shown in Figure 4, the brake caliper body 12 includes a first inner wall 61 and a second inner wall 62. The second inner wall 62 is spaced from the first inner wall 61 in an arrangement direction D4. The brake caliper body 12 includes a recess 63. The first brake pad 55 is at least partially provided in the recess 63. The second brake pad 56 is at least partially provided in the recess 63. The recess 63 is provided between the first inner wall 61 and the second inner wall 62 in the arrangement direction D4. The recess 63 can also be referred to as a pad space 63.

[0077] The first interior wall 61 includes a first wall surface 61A. The first wall surface 61A faces the second interior wall 62 in the arrangement direction D4. The second interior wall 62 includes a second wall surface 62A. The second wall surface 62A faces the first interior wall 61 in the arrangement direction D4. The recess 63 is provided between the first wall surface 61A and the second wall surface 62A in the arrangement direction D4.

[0078] The brake caliper body 12 comprises a first inner surface 64 and a second inner surface 66. The second inner surface 66 is spaced from the first inner surface 64 in an additional arrangement direction D5. The additional arrangement direction D5 is perpendicular to the arrangement direction D4. The first inner surface 64 extends between the first wall surface 61A and the second wall surface 62A in the arrangement direction D4. The second inner surface 66 extends between the first wall surface 61A and the second wall surface 62A in the arrangement direction D4. The recess 63 is provided between the first inner surface 64 and the second inner surface 66 in the additional arrangement direction D5.

[0079] As in Fig. As shown in Figure 5, the recess 63 includes a first end opening 68 and a second end opening 70 and extends between the first end opening 68 and the second end opening 70 in a direction D6. The direction D6 is perpendicular to the arrangement direction D4. The additional arrangement direction D5 is perpendicular to both the arrangement direction D4 and the direction D6. The first wall surface 61A extends in the direction D6. The second wall surface 62A extends in the direction D6.

[0080] As in Fig. As can be seen in Figure 1, the disc brake rotor 11 includes a friction section 71. The friction section 71 extends circumferentially around the axis of rotation RA. The friction section 71 has a ring shape.

[0081] As in Fig. As can be seen in Figure 3, the friction section 71 is in contact with the first brake pad 55 in order to absorb a braking force from the first brake pad 55. The friction section 71 is in contact with the second brake pad 56 in order to absorb the braking force from the second brake pad 56.

[0082] The friction section 71 comprises a first friction surface 71A and a second friction surface 71B. The second friction surface 71B is located on the rear side of the first friction surface 71A in the axial direction D2. The first friction surface 71A is in contact with the first brake pad 55 to absorb the braking force from the first brake pad 55. The second friction surface 71B is in contact with the second brake pad 56 to absorb the braking force from the second brake pad 56.

[0083] As in Fig. As shown in Figure 6, the brake caliper body 12 includes a slot 72. The slot 72 includes a first slot 72A and a second slot 72B. The second slot 72B is spaced apart from the first slot 72A. However, one of the first slot 72A and the second slot 72B can be omitted from the slot 72 if required or desired.

[0084] As in Fig. As can be seen in Figure 3, the first slot 72A is provided on an upstream side of the second slot 72B in the drive direction of rotation D11, in which the disc brake rotor 11 rotates about the axis of rotation RA while the muscle-powered vehicle 2 moves forward. The disc brake rotor 11 is configured to be at least partially provided in slot 72. The disc brake rotor 11 is configured to be at least partially provided in the first slot 72A. The disc brake rotor 11 is configured to be at least partially provided in the second slot 72B.

[0085] The friction section 71 is configured to be at least partially positioned in slot 72. The friction section 71 is configured to be at least partially positioned in the first slot 72A. The friction section 71 is configured to be at least partially positioned in the second slot 72B.

[0086] The recess 63 is connected to the slot 72. The recess 63 is connected to the first slot 72A and the second slot 72B. The first brake pad 55 is at least partially provided in the recess 63. The second brake pad 56 is at least partially provided in the recess 63.

[0087] The first brake pad 55 is positioned outside slot 72. The second brake pad 56 is positioned outside slot 72. The first brake pad 55 is positioned outside the first slot 72A and the second slot 72B. The second brake pad 56 is positioned outside the first slot 72A and the second slot 72B.

[0088] As in Fig. As shown in Figure 3, slot 72 has a slot width W1, defined in the axial direction D2. The friction section 71 has a rotor width W2, also defined in the axial direction D2. The rotor width W2 is defined between the first friction surface 71A and the second friction surface 71B in the axial direction D2. For example, the rotor width W2 is the initial rotor width of a new disc brake rotor.

[0089] A first ratio of slot width W1 to rotor width W2 is less than 1.8. The first ratio is greater than or equal to 1. The first ratio ranges from 1.2 to 1.7. In the present embodiment, the first ratio is 1.57. However, the first ratio is not limited to the above ranges and values.

[0090] A difference between the slot width W1 and the rotor width W2 is less than 1.5 mm. A difference greater than 1 mm is defined as a difference ranging from 1.2 mm to 1.4 mm. In the present embodiment, the difference is 1.25 mm. However, the difference is not limited to the above ranges and values.

[0091] A second ratio of the difference to the slot width W1 is less than 0.4. The second ratio is greater than 0.3. A third ratio of the difference to the rotor width W2 is less than 0.8. The third ratio is greater than 0.4. In the present embodiment, the second ratio is 0.36. The third ratio is 0.57. However, the second ratio is not limited to the above ranges and values. The third ratio is not limited to the above ranges and values.

[0092] The first slot 72A has a first slot width W11, which is defined in the axial direction D2. A fourth ratio of the first slot width W11 to the rotor width W2 is less than 1.8. The fourth ratio is greater than or equal to 1. The fourth ratio ranges from 1.2 to 1.7. In the present embodiment, the fourth ratio is 1.57. However, the fourth ratio is not limited to the above ranges and values.

[0093] The second slot 72B has a second slot width W12, which is defined in the axial direction D2. A fifth ratio of the second slot width W12 to the rotor width W2 is less than 1.8. The fifth ratio is greater than or equal to 1. The fifth ratio ranges from 1.2 to 1.7. In the present embodiment, the fifth ratio is 1.57. However, the fifth ratio is not limited to the above ranges and values.

[0094] As in Fig. As can be seen in Figure 3, the first brake pad 55 has a first initial pad thickness T1, which is defined in the axial direction D2. A sixth ratio of the slot width W1 to the sum of the rotor width W2 and the first initial pad thickness T1 is less than 0.57. The sixth ratio is greater than or equal to 0.3. In the present embodiment, the sixth ratio is 0.56. However, the sixth ratio is not limited to the above ranges and values.

[0095] The slot width W1 is smaller than the initial coating thickness T1. That is, the initial coating thickness T1 is larger than the slot width W1. A seventh ratio of the difference between the slot width W1 and the rotor width W2 to the initial coating thickness T1 is less than 0.4. The seventh ratio is greater than 0.2. In the present embodiment, the seventh ratio is 0.31. However, the seventh ratio is not limited to the above ranges and values.

[0096] The recess 63 has a recess width W3, which is defined in the axial direction D2. The slot width W1 is smaller than the recess width W3. However, the slot width W1 can be greater than or equal to the recess width W3 if required or desired.

[0097] The friction section 71 has a wear tolerance. An eighth ratio of the wear tolerance to the slot width W1 is greater than 0.1. The eighth ratio is preferably greater than 0.15. The eighth ratio is less than 0.3. In the present embodiment, the eighth ratio is not limited to the above ranges and values.

[0098] A ninth ratio of the wear tolerance to the rotor width W2 is greater than 0.23. The ninth ratio is less than 0.4. In the present embodiment, the ninth ratio is 0.32. However, the ninth ratio is not limited to the above ranges and values.

[0099] The second brake pad 56 has a second initial pad thickness T2, which is defined in the axial direction D2. A tenth ratio of the slot width W1 to the sum of the rotor width W2 and the second initial pad thickness T2 is less than 0.57. The tenth ratio is greater than or equal to 0.3. In the present embodiment, the tenth ratio is 0.56. However, the tenth ratio is not limited to the above ranges and values.

[0100] The slot width W1 is smaller than the second initial coating thickness T2. Specifically, the second initial coating thickness T2 is larger than the slot width W1. An eleventh ratio of the difference between the slot width W1 and the rotor width W2 to the second initial coating thickness T2 is less than 0.4. The eleventh ratio is greater than 0.2. In the present embodiment, the eleventh ratio is 0.31. However, the eleventh ratio is not limited to the above range and value.

[0101] As in Fig. As can be seen in Figure 7, the brake caliper body 12 includes a connection port 74. The connection port 74 is designed to be connected to the hydraulic hose 5. The connection port 74 is connected to the first hydraulic chamber 24 and the second hydraulic chamber 26. The hydraulic hose 5 is connected to the connection port 74 by a hose connector 5A. The connection port 74 includes a connection hole 74A. The connection hole 74A includes a threaded hole 74B. The hose connector 5A engages the threaded hole 74B of the connection port 74.

[0102] The brake caliper body 12 includes a first passage 76. The first passage 76 is designed to connect the first hydraulic chamber 24 and the second hydraulic chamber 26. The first passage 76 includes a first through-hole 76A and a second through-hole 76B. That is, the brake caliper body 12 includes the first through-hole 76A. The brake caliper body 12 includes the second through-hole 76B.

[0103] The first through-hole 76A is connected to the first hydraulic chamber 24. The first through-hole 76A extends from the first hydraulic chamber 24. The first through-hole 76A extends from the first hydraulic chamber 24 to the connecting hole 74A. The first through-hole 76A connects the first hydraulic chamber 24 and the connecting hole 74A.

[0104] The second through-hole 76B is connected to the second hydraulic chamber 26. The second through-hole 76B extends from the second hydraulic chamber 26. The second through-hole 76B extends from the second hydraulic chamber 26 to the connecting hole 74A. The second through-hole 76B connects the second hydraulic chamber 26 and the connecting hole 74A. The second through-hole 76B is connected to the first through-hole 76A. The second through-hole 76B is connected to the first through-hole 76A via the connecting hole 74A.

[0105] As in Fig. As shown in Figure 8, the brake caliper body 12 includes a bleed port 78. The brake caliper 10 includes a bleed plug 80 and a bleed cap 81. The bleed plug 80 is movably connected to the brake caliper body 12 to open or close the bleed port 78. The bleed cap 81 is removable and attached to the brake caliper body 12 to cover one end opening of the bleed port 78.

[0106] The vent port 78 includes a first vent hole 78A. The first vent hole 78A is connected to the fourth hydraulic chamber 46. The vent plug 80 is designed to be at least partially positioned within the first vent hole 78A. The first vent hole 78A includes a threaded hole 78B. The vent plug 80 is designed to engage the threads of the threaded hole 78B. The vent plug 80 is designed to open or close the first vent hole 78A.

[0107] The vent port 78 includes a second vent hole 78C. The second vent hole 78C is connected to the first vent hole 78A. The second vent hole 78C is configured to communicate with the first vent hole 78A. The vent plug 80 is configured to open or close the second vent hole 78C. The vent cap 81 is removable and attached to the brake caliper body 12 to cover one end opening of the second vent hole 78C.

[0108] As in Fig. As can be seen in Figure 9, the brake caliper body 12 includes a second passage 86. The second passage 86 is designed to connect the third hydraulic chamber 44 and the fourth hydraulic chamber 46. The second passage 86 includes a third through-hole 86A and a fourth through-hole 86B. That is to say, the brake caliper body 12 includes the third through-hole 86A and the fourth through-hole 86B.

[0109] The third through-hole 86A is connected to the third hydraulic chamber 44. The third through-hole 86A extends from the third hydraulic chamber 44. The third through-hole 86A extends from the third hydraulic chamber 44 to the fourth through-hole 86B. The third through-hole 86A connects the third hydraulic chamber 44 and the fourth through-hole 86B.

[0110] The fourth through-hole 86B is connected to the fourth hydraulic chamber 46. The fourth through-hole 86B extends from the vent port 78. The fourth through-hole 86B extends from the vent port 78 to the third through-hole 86A. The fourth through-hole 86B is connected to the third through-hole 86A. The fourth through-hole 86B is connected to the fourth hydraulic chamber 46 via the vent port 78. Thus, the fourth through-hole 86B extends from the fourth hydraulic chamber 46.

[0111] As in Fig. As can be seen in Figure 10, the brake caliper body 12 includes a fifth through-hole 88. The fifth through-hole 88 connects the first hydraulic chamber 24 and the third hydraulic chamber 44. The first hydraulic chamber 24 is connected to the third hydraulic chamber 44 via the fifth through-hole 88.

[0112] As in Fig. As can be seen in Figure 8, the brake caliper body 12 includes a sixth through-hole 90. The sixth through-hole 90 connects the second hydraulic chamber 26 and the fourth hydraulic chamber 46. The second hydraulic chamber 26 is connected to the fourth hydraulic chamber 46 via the sixth through-hole 90.

[0113] As in Fig. As can be seen in Figure 10, the first hydraulic chamber 24 is connected to the second hydraulic chamber 26 via the first through-hole 76. The first hydraulic chamber 24 is connected to the second hydraulic chamber 26 via the first through-hole 76A and the second through-hole 76B. The first hydraulic chamber 24 and the second hydraulic chamber 26 are connected to the connecting port 74 via the first through-hole 76. The first hydraulic chamber 24 and the second hydraulic chamber 26 are connected to the connecting port 74 via the first through-hole 76A and the second through-hole 76B. The first hydraulic chamber 24 is connected to the third hydraulic chamber 44 via the fifth through-hole 88. The second hydraulic chamber 26 is connected to the fourth hydraulic chamber 46 via the sixth through-hole 90. The third hydraulic chamber 44 is connected to the fourth hydraulic chamber 46 via the second passage 86 and the vent connection 78.The third hydraulic chamber 44 is connected to the fourth hydraulic chamber 46 via the third through-hole 86A, the fourth through-hole 86B and the vent connection 78.

[0114] The third through-hole 86A is connected to the first hydraulic chamber 24 via the third hydraulic chamber 44 and the fifth through-hole 88. Thus, the third through-hole 86A is connected to the first hydraulic chamber 24.

[0115] The fourth through-hole 86B is connected to the second hydraulic chamber 26 via the vent port 78, the fourth hydraulic chamber 46, and the sixth through-hole 90. Thus, the fourth through-hole 86B is connected to the second hydraulic chamber 26. The second through-hole 86 is designed to connect the first hydraulic chamber 24 and the second hydraulic chamber 26.

[0116] As in Fig. As can be seen in Figure 8, the vent port 78 is connected to the third hydraulic chamber 44. As shown in the Fig. 8 and Fig. As can be seen in Figure 10, the vent port 78 is connected to the first hydraulic chamber 24 via the third hydraulic chamber 44 and the fifth through-hole 88. The vent port 78 is connected to the second hydraulic chamber 26 via the third hydraulic chamber 44, the second through-hole 86, the fourth hydraulic chamber 46, and the sixth through-hole 90. Thus, the vent port 78 is connected to both the first hydraulic chamber 24 and the second hydraulic chamber 26.

[0117] As in Fig. As can be seen in Figure 10, the second pass 86 differs from the first pass 76. The second pass 86 is provided separately from the first pass 76. The third pass 86A is provided separately from the first pass 76A and the second pass 76B. The fourth pass 86B is provided separately from the first pass 76A and the second pass 76B.

[0118] The first passage 76 is at least partially located on a downstream side of the second passage 86 in the drive direction D11 of the disc brake rotor 11. In the present embodiment, the first passage 76 is entirely located on the downstream side of the second passage 86 in the drive direction D11. However, the first passage 76 can be partially located on the downstream side of the second passage 86 in the drive direction D11 if required or desired.

[0119] At least one of the first through-hole 76A and the second through-hole 76B is at least partially provided on a downstream side of at least one of the third through-hole 86A and the fourth through-hole 86B in the drive direction D11 of the disc brake rotor 11. In the present embodiment, the first through-hole 76A is fully provided on the downstream side of each of the third through-hole 86A and the fourth through-hole 86B in the drive direction D11. The second through-hole 76B is fully provided on the downstream side of each of the third through-hole 86A and the fourth through-hole 86B in the drive direction D11.However, the first through-hole 76A can be partially located on the downstream side of at least one of the third through-hole 86A and the fourth through-hole 86B in the drive direction of rotation D11, if required or desired. The second through-hole 76B can also be partially located on the downstream side of at least one of the third through-hole 86A and the fourth through-hole 86B in the drive direction of rotation D11, if required or desired.

[0120] As in Fig. As shown in Figure 7, the brake caliper 10 includes a plug structure 92. The second through-hole 76B includes an end hole 76C. The plug structure 92 is provided in the end hole 76C to close the end hole 76C. The plug structure 92 includes an inner member 92A and an outer member 92B. The outer member 92B includes an inner chamber 92C. The inner member 92A is provided in the inner chamber 92C. The inner member 92A is pressed into the inner chamber 92C. The inner member 92A has an outer diameter that is larger than the inner diameter of the inner chamber 92C. The inner member 92A presses the outer member 92B against an inner surface of the end hole 76C by being pressed into the inner chamber 92C. For example, the outer member 92B includes at least one protruding section with an annular shape. The at least one projecting section of the outer member 92B is pressed against the inner surface of the end hole 76C by the inner member 92A.Thus, the plug structure 92 seals the end hole 76C of the second through hole 76B. The plug structure 92 can have a different structure than the illustrated embodiment if required or desired.

[0121] The brake caliper 10 includes a plug cover 92S. The plug cover 92S is at least partially provided in the 76C to cover the plug structure 92. The plug cover 92S is made of a resin material. Examples of the resin material include an ultraviolet curing material that hardens in response to ultraviolet light. The plug cover 92S can be omitted from the brake caliper 10 if required or desired.

[0122] As in Fig. As can be seen in Figure 9, the brake caliper 10 includes a plug structure 94. The fourth through-hole 86B includes an end hole 86C. The plug structure 94 is provided in the end hole 86C to close the end hole 86C. The plug structure 94 includes an inner member 94A and an outer member 94B. The outer member 94B includes an inner chamber 94C. The inner member 94A is provided in the inner chamber 94C. The inner member 94A is pressed into the inner chamber 94C. The inner member 94A has an outer diameter that is larger than the inner diameter of the inner chamber 94C. The inner member 94A presses the outer member 94B against an inner surface of the end hole 86C by being pressed into the inner chamber 94C. For example, the outer member 94B includes at least one protruding section with an annular shape. The at least one projecting section of the outer member 94B is pressed against the inner surface of the end hole 86C by the inner member 94A.Thus, the plug structure 94 seals the end hole 86C of the fourth through hole 86B. The plug structure 94 can, if required or desired, have a different structure than the illustrated embodiment.

[0123] The brake caliper 10 includes a plug cover 94S. The plug cover 94S is at least partially provided in the 86C to cover the plug structure 94. The plug cover 94S is made of a resin material. Examples of the resin material include an ultraviolet curing material that hardens in response to ultraviolet light. The plug cover 94S can be omitted from the brake caliper 10 if required or desired.

[0124] As in Fig. As can be seen in Figure 11, for example, in a case where the slot width W1X of slot 72X is larger than the slot width W1 of slot 72, which is shown in Fig. As shown in Figure 3, it is likely that the first brake pad 55 enters a space SP provided between the disc brake rotor 11 and an inner surface of the slot 72X in a case where the first brake pad 55 is worn.

[0125] As in Fig. As can be seen in 12, it is less likely that the first brake pad 55 will enter the space SP provided between the disc brake rotor 11 and the inner surface of the slot 72X in a case where the first brake pad 55 is worn, since the slot width W1 is smaller than the slot width W1X shown in Fig. This is shown in Figure 11. It is therefore possible to increase the initial pad thickness T1 of the first brake pad 55, which improves the durability of the brake system 10. The same can apply to the second brake pad 56.

[0126] In the embodiment described above, the brake caliper 10 comprises the first piston 20, the second piston 22, the third piston 40, and the fourth piston 42. However, the total number of pistons is not limited to four. For example, at least one of the second piston 22, the third piston 40, and the fourth piston 42 can be omitted from the brake caliper 10 if necessary or desired. The brake caliper 10 can also include at least one additional piston besides the first piston 20, the second piston 22, the third piston 40, and the fourth piston 42.

[0127] Furthermore, the first piston 20 and the second piston 22 can be provided on the same side with respect to the recess 63 in the arrangement direction D4, if required or desired. The third piston 40 and the fourth piston 42 can also be provided on the same side with respect to the recess 63 in the arrangement direction D4, if required or desired.

[0128] In the present application, the term "comprehensive" and its derivatives, as used herein, are intended to be open terms that specify the presence of the indicated features, elements, components, groups, numbers, and / or steps, but do not exclude the presence of other unspecified features, elements, components, groups, numbers, and / or steps. This concept also applies to words with similar meanings, for example, the terms "have," "include," and their derivatives.

[0129] The terms “member”, “area”, “section”, “part”, “element”, “body” and “structure”, when used in the singular, can have the dual meaning of a single part or a plurality of parts.

[0130] The ordinal numbers such as "first" and "second" used in this application are merely identifiers and have no other meaning, such as indicating a specific order or the like. Furthermore, the term "first element," for example, does not imply the existence of a "second element," and vice versa.

[0131] The term “pair of”, as used here, can include the configuration in which the pair of elements has different shapes or structures from each other, in addition to the configuration in which the pair of elements has the same shapes or structures.

[0132] The terms “a”, “one or more” and “at least one” can be used interchangeably here.

[0133] The phrase “at least one of,” as used in this revelation, means “one or more” of a desired choice. For example, the phrase “at least one of,” as used in this revelation, means “only a single choice” or “both of two choices” when the number of choices is two. For another example, the phrase “at least one of,” as used in this revelation, means “only a single choice” or “any combination of two or more choices” when the number of choices is three or more. For example, the phrase “at least one of A and B” includes (1) A alone, (2) B alone, and (3) both A and B. The phrase “at least one of A, B, and C” includes (1) A alone, (2) B alone, (3) C alone, (4) both A and B, (5) both B and C, (6) both A and C, and (7) all A, B, and C.In other words, the expression “at least one of A and B” in this revelation does not mean “at least one of A and at least one of B”.

[0134] Finally, terms such as "essentially", "about", and "approximately", as used here, signify a reasonable deviation from the modified term, such that the final result is not significantly altered. All numerical values ​​described in the present application can be interpreted as including terms such as "essentially", "about", and "approximately".

[0135] Obviously, numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore understood that the invention can be implemented differently than specifically described here, within the scope of the appended claims.

Claims

[1] Braking system for a human-powered vehicle, comprising: a brake caliper, where the brake caliper includes: a brake caliper body including a first piston chamber and a slot; a first brake pad movable relative to the brake caliper body, and a first piston movably provided in the first piston chamber; a disc brake rotor rotatable relative to the brake caliper about a rotation axis, the disc brake rotor being configured to be at least partially provided in the slot, the disc brake rotor including a friction portion contactable with the first brake pad to receive a braking force from the first brake pad; wherein the slot has a slot width defined in an axial direction defined along the axis of rotation; wherein the friction section has a rotor width defined in the axial direction; and a first ratio between the slot width and the rotor width is less than 1.

8. [2] A braking system according to claim 1, wherein the first ratio is greater than or equal to 1. [3] A braking system according to claim 1 or 2, wherein a difference between the slot width and the rotor width is less than 1.5 mm. [4] A braking system according to claim 3, wherein the difference is longer than 1 mm. [5] A braking system according to claim 3 or 4, wherein a second ratio of the difference to the slot width is less than 0.

4. [6] A braking system according to claim 5, wherein the second ratio is greater than 0.

3. [7] Braking system according to one of claims 3 to 6, wherein a third ratio of the difference to the rotor width is less than 0.

8. [8] A braking system according to claim 7, wherein the third ratio is greater than 0.

4. [9] Braking system according to one of claims 1 to 8, in which the brake caliper body contains a second piston chamber, and the brake caliper includes: a second brake pad movable relative to the brake caliper body, and a second piston movably provided in the second piston chamber, wherein the friction portion is contactable with the second brake pad to receive the braking force from the second brake pad. [10] Braking system according to one of claims 1 to 9, in which the friction portion includes a first friction surface and a second friction surface provided on a back side of the first friction surface in the axial direction, and the rotor width is defined between the first friction surface and the second friction surface in the axial direction. [11] A braking system according to any one of claims 1 to 10, wherein the slot includes a first slot and a second slot spaced from the first slot, the first slot has a first slot width defined in the axial direction, and a fourth ratio of the first slot width to the rotor width is less than 1.

8. [12] Braking system according to claim 11, wherein the second slot has a second slot width defined in the axial direction, and a fifth ratio of the second slot width to the rotor width is less than 1.

8. [13] A braking system according to claim 11 or 12, wherein the first slot is provided on an upstream side of the second slot in a drive rotational direction in which the disc brake rotor rotates about the rotational axis while the human-powered vehicle moves forward. [14] Braking system according to one of claims 1 to 13, in which the first brake pad is movable relative to the brake caliper body in the axial direction, and the first brake pad is provided outside the slot. [15] Braking system according to one of claims 1 to 14, in which the first brake pad has a first initial pad thickness defined in the axial direction and a sixth ratio of the slot width to a sum of the rotor width and the first initial lining thickness is less than 0.

57. [16] A braking system according to claim 15, wherein the sixth ratio is greater than or equal to 0.

3. [17] A braking system according to claim 15 or 16, wherein the slot width is smaller than the first initial lining thickness. [18] A braking system according to any one of claims 15 to 17, wherein a seventh ratio of a difference between the slot width and the rotor width to the first initial lining thickness is less than 0.

4. [19] A braking system according to claim 18, wherein the seventh ratio is greater than 0.

2. [20] Braking system according to one of claims 1 to 19, in which the brake caliper body includes a recess connected to the slot, the first brake pad is at least partially provided in the recess, the recess has a recess width defined in the axial direction, and the slot width is smaller than the recess width. [21] Braking system according to one of claims 1 to 20, in which the friction section has a wear tolerance, and an eighth ratio of the wear tolerance to the slot width is greater than 0.

1. [22] Braking system according to one of claims 1 to 21, in which the friction section has a wear tolerance, and a ninth ratio of the wear tolerance to the rotor width is greater than 0.23.

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