Disc brake caliper

Abstract

A caliper (1) for a disc brake (2) includes a caliper body (3) adapted to be integrally connected to a short axle of a vehicle. The caliper (1) includes a first pad (5) and a second pad (6) disposed opposite to it, the first and second pads being connected to the caliper body (3). The first pad (5) and the second pad (6) are spaced apart from each other and define a disc space to accommodate a brake disc (4). The caliper (1) includes an electric motor (8) and a transmission system (9), wherein the transmission system (9) is configured to transmit mechanical power generated by the electric motor (8) to the first pad (5) and the second pad (6). The transmission system (9) includes a first actuation device (10) and a second actuation device (11), wherein the first actuation device (10) is positioned at the first pad (5) and configured to drive the first pad (5) to translate toward the disk space, wherein the second actuation device (11) is positioned at the second pad (6) and configured to drive the second pad (6) to translate toward the disk space, wherein the transmission system (9) includes a differential gear device (7) configured to achieve coupling and decoupling between the translation of the first pad (5) toward the disk space and the translation of the second pad (6) toward the disk space.

Description

Technical Field

[0001] This invention relates to a disc brake caliper, particularly a disc brake caliper for brake-by-wire (“BBW”) type braking systems of vehicles with two or more wheels. Background Technology

[0002] In a BBW braking system, the force and displacement applied by the driver to the brake pedal or brake lever are decoupled from the braking force subsequently applied by the calipers to the vehicle wheels.

[0003] In the BBW braking system, the force and displacement applied by the driver to the brake pedal or brake lever are converted into electrical signals, which are processed by the control unit to control the actuation of the brake system calipers.

[0004] The inventors know of a BBW-type braking system that includes a disc brake equipped with a floating caliper.

[0005] The use of floating calipers cannot guarantee high braking performance, especially in the field of sports, that is, under harsh conditions such as track use.

[0006] Therefore, in the field of sports braking, a braking system with fixed calipers is preferred. However, incorporating fixed calipers into a BBW-type braking system involves several key issues and technical complexities.

[0007] One of the key issues associated with integrating a fixed caliper into a BBW-type braking system is achieving the movement of pistons positioned on the inside and outside of the caliper to ensure the required clamping force while simultaneously achieving a high degree of compactness in the braking system.

[0008] In addition, there is a need for a disc brake caliper of the BBW type braking system, which can also perform parking brake operation. Summary of the Invention

[0009] The object of the present invention is to provide a disc brake caliper and a BBW-type braking system equipped with such a caliper, so as to eliminate at least some of the disadvantages of the prior art.

[0010] A particular objective of the present invention is to provide a disc brake caliper and a BBW-type braking system equipped with such a caliper, wherein the disc brake caliper and the BBW-type braking system enable the movement of pistons positioned on the inner and outer sides of the caliper to ensure the required clamping force while simultaneously achieving a high degree of compactness in the braking system.

[0011] Another particular object of the present invention is to provide a disc brake caliper and a BBW-type braking system equipped with such a caliper, which can also perform parking braking.

[0012] These and other objectives are achieved by the disc brake caliper as described in the independent claims and the BBW type braking system equipped with such caliper.

[0013] The dependent claims relate to preferred and advantageous embodiments of the invention. Attached Figure Description

[0014] To better understand the present invention and recognize its advantages, some non-limiting exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which: - Figure 1 This is a front perspective view of a disc brake according to an embodiment of the present invention, the disc brake including a caliper; - Figure 2 yes Figure 1 The rear-view perspective view of the disc brake shown; - Figure 3 Is included Figure 1 The rear perspective view of a component in the caliper shown includes a drivetrain associated with the brake pad. - Figure 4 yes Figure 3 A front-view perspective view of the components shown; - Figure 5 yes Figure 3 A side view of the components shown; - Figure 6 yes Figure 3 A top view of the components shown; - Figure 7 yes Figure 3 Rear perspective view of the drivetrain of the caliper assembly shown; - Figure 8 yes Figure 7 A front perspective view of the transmission system shown; - Figure 9 yes Figure 7 Side view of the transmission system shown; - Figure 10 yes Figure 7 The bottom view of the transmission system shown; - Figure 11 yes Figure 7 A front perspective view of the components of the transmission system shown in the figure; - Figure 12 yes Figure 11 Rear perspective view of the component shown; - Figure 13 yes Figure 11 Another perspective view of the components shown, in a partially disassembled configuration; - Figure 14 yes Figure 13 Rear perspective view of the component shown; - Figure 15 yes Figure 7 An axial cross-sectional view of the component shown; - Figure 16 yes Figure 7 A perspective view of other components of the transmission system shown; - Figure 17 yes Figure 16 The axial cross-sectional view of the component shown. Detailed Implementation

[0015] Calipers, particularly fixed calipers for brake-by-wire (“BBW”) type braking systems, are generally indicated by reference numeral 1. Caliper 1 is adapted to be integrated into a disc brake 2 having two or more wheels.

[0016] The caliper 1 includes a caliper body 3, which is adapted to be integrally connected to the short shaft of the vehicle.

[0017] The caliper 1 includes a first pad 5 and a second pad 6 disposed opposite to it, the first pad 5 and the second pad 6 being connected to the caliper body 3.

[0018] The first pad 5 and the second pad 6 are spaced apart from each other and define the space for the brake disc 4.

[0019] The caliper 1 includes an electric motor 8 and a transmission system 9 disposed opposite to it.

[0020] The transmission system 9 is configured to transmit the mechanical power generated by the electric motor 8 to the first pad 5 and the second pad 6.

[0021] Therefore, pads 5 and 6 can move toward and away from brake disc 4.

[0022] The transmission system 9 includes a first actuation device 10.

[0023] The first actuator 10 is disposed at the first pad 5. The first actuator 10 is configured to actuate the first pad 5 to translate into the disk space.

[0024] In addition, the transmission system 9 includes a second actuation device 11.

[0025] The second actuation device 11 is disposed at the second pad 6. The second actuation device 11 is configured to actuate the second pad 6 to translate into the disk space.

[0026] According to one aspect of the invention, the transmission system 9 includes a differential gear device 7.

[0027] The differential gear device 7 is configured to achieve coupling and decoupling between the translation of the first pad 5 toward the disk space and the translation of the second pad 6 toward the disk space.

[0028] "Differential" means that the gear mechanism 7 is configured to introduce a difference or decouple between the movement of the first pad toward the disk space and the movement of the second pad toward the disk space.

[0029] Advantageously, the caliper 1 constructed in this way allows the two pads 5, 6 to be moved against the brake disc 4 via the transmission system 9.

[0030] Another advantage is that the differential gear device 7 provided in the transmission system 9 allows for the coupling and decoupling of the movement of the opposing pads 5 and 6 along the direction of the brake disc 4. Specifically, the coupling of the translational movement of the opposing pads 5 and 6 is particularly advantageous when the pads 5 and 6 are brought closer to the brake disc, because the transmission system 9 allows for the translational actuation of the two pads 5 and 6. When the first pad 5 abuts against the brake disc 4 and the braking force actuated on the brake disc 4 is increased, the caliper body 3 subsequently undergoes elastic deformation, which tends to cause the opposing outer pad 5 to deviate from the brake disc 4. This deviation is advantageously compensated by decoupling the opposing pads 5 and 6 by means of the differential gear device 7, which allows the second pad 6 to be further translated toward the brake disc 4, thereby compensating for the deviation caused by the elastic deformation of the caliper body 3, but the first pad 5 remains abutting against the brake disc 4 and therefore cannot be translated.

[0031] Therefore, the differential gear device 7 allows the two pads to translate together during coupling, or allows the translational movement of one pad to be reduced relative to the oppositely positioned pads during decoupling, and in particular allows such reduction that one of the two pads is prevented from translating in the direction of the brake disc 4, while the oppositely positioned pads are able to translate in the direction of the brake disc 4.

[0032] Therefore, the caliper 1 constructed in this way allows for high clamping force to cause the caliper body 3 to elastically deform, thus making it suitable for sports applications.

[0033] According to the embodiment, the differential gear device 7 is a planetary gear device. "Planetary gear device" means a gear device that includes multiple gears, wherein the shafts of one or more gears are movable.

[0034] First actuator 10 According to an embodiment, the first actuation device 10 includes a first pushing member 12.

[0035] The first pushing member 12 extends along the corresponding first thrust axis 13. Furthermore, the first pushing member 12 is positioned facing the first pad 5 and disposed opposite to the disk space.

[0036] By actuating the first actuation device 10, the first pushing member 12 can be actuated to translate along the first thrust axis 13 to abut against the first pad 5.

[0037] According to one embodiment, the actuating device 10 includes a first nut body 16. The first nut body 16 is coaxial with the first thrust axis 13.

[0038] The first actuator 10 is configured such that rotation of the first nut body 16 about the first thrust axis 13 corresponds to translation of the first push member 12 along the first thrust axis 13.

[0039] According to one embodiment, the first nut body 16 has an internal nut thread 17. The first nut thread 17 extends coaxially with the first thrust axis 13 and faces the first thrust axis 13.

[0040] According to the embodiment, the first pushing member 12 has an external lead screw thread portion 18. The external lead screw thread portion 18 engages with the internal nut thread portion 17 of the first nut body 16.

[0041] According to one embodiment, the external screw thread portion 18 directly engages with the internal nut thread portion 17. According to an alternative embodiment, the first push member 12 and the first nut body 16 form a recirculating ball screw. According to another embodiment, recirculating balls are positioned between the external screw thread portion 18 and the internal nut thread portion 17.

[0042] Therefore, the rotation of the first nut body 16 about the first thrust axis 13 corresponds to the translation of the first push member 12 along the first thrust axis 13.

[0043] According to an embodiment, the first pushing member 12 includes a threaded shaft 45, which is connected to the thrust wall 46.

[0044] The threaded shaft 45 has an external lead screw thread 18. The threaded shaft 45 is inserted into the first nut body 16. Specifically, the threaded shaft 45 extends along the first thrust axis 13 and engages with the internal nut thread 17 of the first nut body 16. Rotation of the first nut body 16 about the first thrust axis 13 corresponds to translation of the threaded shaft 45 along the first thrust axis 13.

[0045] The thrust wall 46 is fixed to one end of the threaded shaft 45 facing the first pad 5.

[0046] The thrust wall 46 is configured to abut against the first pad 5 and generate braking force on the brake disc 4.

[0047] According to the embodiment, the thrust wall 46 is substantially circular in shape and is coaxial with the first thrust axis 13.

[0048] The thrust wall 46 defines a thrust surface 44 facing the first pad 5. According to an embodiment, the thrust surface 44 is at least partially knurled.

[0049] Advantageously, the knurled thrust surface 44 ensures that the first thrust member 12 does not rotate about the first thrust axis 13, but translates along the first thrust axis 13.

[0050] Second actuation device 11 According to an embodiment, the second actuation device 11 includes a second pushing member 14.

[0051] The second pushing member 14 extends along the corresponding second thrust axis 15. Furthermore, the second pushing member 14 is positioned facing the second pad 6 and disposed opposite to the disk space.

[0052] By actuating the second actuation device 11, the second pushing member 14 can be actuated to translate along the second thrust axis 15 to abut against the second pad 6.

[0053] According to one embodiment, the second actuation device 11 includes a second nut body 19. The nut body 19 is positioned coaxially with the second thrust axis 15.

[0054] The second actuation device 11 is configured such that rotation of the second nut body 19 about the second thrust axis 15 corresponds to translation of the second push member 14 along the second thrust axis 15.

[0055] According to the embodiment, the second nut body 19 has an inner nut thread portion 17. The inner nut thread portion 17 extends coaxially with the second thrust axis 15 and faces the second thrust axis 15.

[0056] According to the embodiment, the second pushing member 14 has an external lead screw thread portion 18. The external lead screw thread portion 18 engages with the internal nut thread portion 17 of the second nut body 19.

[0057] According to one embodiment, the external screw thread portion 18 directly engages with the internal nut thread portion 17. According to an alternative embodiment, the second push member 14 and the second nut body 19 form a recirculating ball screw. According to another embodiment, recirculating balls are positioned between the external screw thread portion 18 and the internal nut thread portion 17.

[0058] Therefore, the rotation of the second nut body 19 about the second thrust axis 15 corresponds to the translation of the second push member 14 along the second thrust axis 15.

[0059] According to an embodiment, the second pushing member 14 includes a threaded shaft 45, which is connected to the thrust wall 46.

[0060] The threaded shaft 45 has an external lead screw thread 18. The threaded shaft 45 is inserted into the second nut body 19. Specifically, the threaded shaft 45 extends along the second thrust axis 15 and engages with the internal nut thread 17 of the second nut body 19. Rotation of the second nut body 19 about the second thrust axis 15 corresponds to translation of the threaded shaft 45 along the second thrust axis 15.

[0061] The thrust wall 46 is fixed to one end of the threaded shaft 45 facing the second pad 6.

[0062] The thrust wall 46 is configured to abut against the outer pad 5 and generate braking force on the brake disc 4.

[0063] According to the embodiment, the thrust wall 46 is substantially circular in shape and is coaxial with the second thrust axis 15.

[0064] The thrust wall 46 defines a thrust surface 44 facing the second pad 6. According to an embodiment, the thrust surface 44 is at least partially knurled.

[0065] Advantageously, the knurled thrust surface 44 ensures that the second thrust member 14 does not rotate about the second thrust axis 15, but translates along the second thrust axis 15.

[0066] Differential gear device 7 According to one embodiment, the differential gear device 7 includes a translation gear 20. The translation gear 20 is positioned such that it is coaxial with and rotatable about the first thrust axis 13.

[0067] The differential gear device 7 is configured such that the rotation of the translation gear 20 about the first thrust axis 13 corresponds to the translation of the first push member 12 along the thrust axis 13.

[0068] The differential gear assembly 7 also includes a transmission gear 21. The transmission gear 21 is positioned such that it is coaxial with and rotatable about the first thrust axis 13. Specifically, the transmission gear 21 is positioned coaxially with the transmission gear 20. Preferably, the transmission gear 21 is positioned to fit onto the first nut body 16.

[0069] The differential gear device 7 is configured such that the rotation of the transmission gear 21 about the first thrust axis 13 corresponds to the translation of the second push member 14 along the second thrust axis 15.

[0070] According to an embodiment, the differential gear device 7 includes at least one planetary gear 22.

[0071] At least one planetary gear 22 meshes with a translational gear 20 and a transmission gear 21.

[0072] At least one planetary gear 22 is configured to receive mechanical power from an electric motor 8 via a transmission system 9 and transmit the mechanical power to a translational gear 20 and a transmission gear 21.

[0073] Advantageously, the transmission system 9 constructed in this way allows mechanical power to be transmitted to the first pad 5 and the second pad 6. Furthermore, the differential gear device 7 allows for coupling and decoupling between the actuating members 12 and 14, which allows the second actuating member 14 to be translated to rest against the second pad 6, even when the first actuating member 12 is in a non-translatable manner against the first pad 5.

[0074] According to the embodiment, the translation gear 20 is formed from the first nut body 16.

[0075] Advantageously, this configuration allows the differential gear assembly 7 to be combined with the first actuation device 10, since the translational gear 20 is integrally formed with the first nut body 16.

[0076] According to one embodiment, the first nut body 16 includes a lateral translation tooth 23. The lateral translation tooth 23 extends coaxially with the first thrust axis 13. Furthermore, the lateral translation tooth 23 faces the transmission gear 21.

[0077] The lateral translation teeth 23 of the first nut body 16 mesh with at least one planetary gear 22.

[0078] According to one embodiment, the transmission gear 21 includes a corresponding side transmission tooth 24. The side transmission tooth 24 extends coaxially with the first thrust axis 13. Furthermore, the side transmission tooth 24 faces the side translation tooth 23.

[0079] The side transmission teeth 24 of the transmission gear 21 mesh with at least one planetary gear 22.

[0080] Therefore, the lateral translation tooth 23 and the lateral transmission tooth 24 directly mesh with at least one planetary gear 22, and the lateral translation tooth 23 and the lateral transmission tooth 24 indirectly mesh with each other.

[0081] At least one planetary gear 22 includes an external tooth portion 25. The external tooth portion 25 directly meshes with a side translation tooth portion 23 and a side drive tooth portion 24.

[0082] The external tooth 25 extends in a manner coaxial with and rotatable about the planetary gear rotation axis 26. The external tooth 25 is integral with the planetary gear 22 and is radially aligned with the first thrust axis 13.

[0083] Therefore, at least one planetary gear 22 with such meshing and configuration can rotate about the planetary gear rotation axis 26 of the at least one planetary gear 22, which is radial to the first thrust axis 13, and at least one planetary gear 22 with such meshing and configuration can also rotate about the first thrust axis 13.

[0084] According to an embodiment, at least one planetary gear 22 includes a planetary gear shaft 27.

[0085] The planetary shaft 27 is fixed to the external gear 25. The planetary shaft 27 extends along the planetary rotation axis 26 in a direction opposite to the first thrust axis 13.

[0086] According to an embodiment, the differential gear device 7 includes at least one planetary gear carrier body 28.

[0087] The planetary gear carrier body 28 is connected to at least one planetary gear 22 so as to receive mechanical power from the electric motor 8 and transmit the mechanical power to at least one planetary gear 22.

[0088] Therefore, the planetary gear carrier body 28 drives at least one planetary gear 22 to rotate about the first thrust axis 13.

[0089] According to the embodiment, the planetary gear carrier body 28 is positioned such that it is coaxial with the first thrust axis 13 and rotates about the first thrust axis 13.

[0090] According to one embodiment, the planetary gear carrier body 28 is formed with at least one through hole 32 for rotatably accommodating a corresponding planet shaft 27 of at least one planetary gear 22. The at least one through hole 32 extends along the planetary gear rotation axis 26.

[0091] Advantageously, by means of at least one through hole 32, the planetary carrier body 28 is able to carry at least one planetary gear 22 to rotate about a first thrust axis 13, while allowing the planetary gear 22 to rotate about the planetary rotation axis 26.

[0092] According to an embodiment, the differential gear device 7 includes a plurality of planetary gears 22.

[0093] According to the embodiment, the differential gear device 7 includes two planetary gears 22, which are arranged at equal angular distances from each other about the first thrust axis 13, i.e., at a corresponding angular distance of 180°.

[0094] According to another embodiment, the differential gear device 7 includes three planetary gears 22, which are arranged at equal angular intervals around the first thrust axis 13, i.e., at corresponding angular distances of 120°.

[0095] According to another embodiment, the differential gear device 7 includes four planetary gears 22, which are arranged equidistantly from each other at an angle about the first thrust axis 13, i.e., at a corresponding angular distance of 90°.

[0096] Therefore, the planetary gear carrier body 28 is defined with a plurality of through holes 32, which are at least equal to the number of planetary gears 22 connected to the planetary gear carrier body 28.

[0097] According to an embodiment, the planetary gear carrier body 28 includes an outer gear ring 29.

[0098] The outer annular nut 29 is adapted to receive mechanical power from the electric motor 8 and transmit the mechanical power to the at least one planetary gear 22.

[0099] According to the embodiment, the outer gear ring 29 extends coaxially with the first thrust axis 13. Specifically, the outer gear ring 29 faces a direction opposite to and radial to the first thrust axis 13.

[0100] According to the embodiment, the first nut body 16 has a sliding surface 30. The sliding surface 30 extends coaxially with the first thrust axis 13.

[0101] The sliding surface 30 faces a direction opposite to the first thrust axis 13. Furthermore, the sliding surface 30 is positioned opposite to the internal nut thread portion 17.

[0102] According to the embodiment, the lateral translation tooth 23 extends protrudingly from the sliding surface 30.

[0103] According to the embodiment, the transmission gear 21 is mounted on the sliding surface 30. Therefore, the side transmission tooth 24 is rotatably mounted on the sliding surface 30, thereby facing the side translation tooth 23.

[0104] According to one embodiment, at least one planetary gear 22 is positioned to face the sliding surface 30. According to one embodiment, the outer teeth 25 of at least one planetary gear 22 are configured to contact the sliding surface 30.

[0105] Advantageously, this configuration reduces the radial dimensions of the differential gear assembly 7 and the first actuation device 10.

[0106] According to the embodiment, the planetary gear carrier body 28 is at least partially fitted onto the side drive gear 24 and the side translation gear 23.

[0107] Advantageously, this configuration reduces the overall radial dimensions of the differential gear unit 7, the first actuation device 10, and the transmission system 9.

[0108] According to one embodiment, the planetary gear carrier body 28 is positioned such that the outer gear ring 29 is at least partially fitted onto the side drive gear portion 24. Preferably, the outer gear ring 29 is fully fitted onto the side drive gear portion 24.

[0109] Advantageously, this configuration reduces the axial dimensions of the differential gear assembly 7, the first actuation device 10, and the transmission system 9 because the axial dimension of the outer gear ring 29 is at least partially embedded within the axial dimension occupied by the drive-side teeth 24, and preferably, the axial dimension of the outer gear ring 29 is completely embedded within the axial dimension occupied by the drive-side teeth 24.

[0110] According to the embodiment, the differential gear device 7 is configured such that, with reference to the first thrust axis 13, the axial dimension occupied by the planetary gear carrier body 28 is completely embedded within the axial dimension occupied by the translation gear 20 and the transmission gear 21.

[0111] According to the embodiment, the differential gear device 7 is configured such that, with reference to the first thrust axis 13, the axial dimension occupied by the transmission gear 21 is completely embedded within the axial dimension occupied by the translation gear 20.

[0112] According to a preferred embodiment, the differential gear device 7 is configured such that, with reference to the first thrust axis 13, the axial dimension occupied by both the planetary gear carrier body 28 and the transmission gear 21 is completely embedded within the axial dimension occupied by the translation gear 20.

[0113] According to an embodiment, the transmission gear 21 includes a transmission gear ring 33.

[0114] The external drive gear ring 33 is adapted to transmit mechanical power to at least one second push member 14 via the transmission system 9.

[0115] Specifically, the external drive gear ring 33 is configured to transmit mechanical power received from the electric motor 8, for example, via at least one planetary gear 22 or via the planetary gear carrier body 28, to the at least one second push member 14.

[0116] The external drive gear ring 33 extends coaxially with the first thrust axis 13. Specifically, the external drive gear ring 33 faces a radial direction opposite to the first thrust axis 13.

[0117] Advantageously, both the external drive gear ring 33 and the side drive wall 24 are integrated into the drive gear 21, thereby reducing the size of the differential gear assembly 7.

[0118] According to the embodiment, the external transmission gear ring 33 faces the external gear ring 29 of the planetary gear carrier body 28 along an axial direction parallel to the first thrust axis 13.

[0119] According to the embodiment, with reference to the first thrust axis 13, the outer transmission gear ring 33 has a radial dimension that is substantially equal to the radial dimension of the outer gear ring 29.

[0120] Advantageously, this configuration reduces the radial dimensions of the differential gear assembly 7 and the first actuation device 10.

[0121] According to an embodiment, the transmission system 9 includes a mechanical retainer 31, which is configured to prevent axial movement of the transmission gear 21, i.e., movement in a direction parallel to the first thrust axis 13.

[0122] According to one embodiment, the mechanical retainer 31 is a locking ring. The locking ring is interference-fitted onto the translational gear 30 at the transmission gear 21. According to one embodiment, the locking ring is positioned facing the external transmission gear ring 33 and is disposed opposite to the external gear ring 29 of the planetary gear carrier body 28.

[0123] According to the embodiment, the locking ring is housed in a circumferential seat formed in the translation gear 20, which is located at one end of the sliding surface 30 facing the first pad 5.

[0124] According to one embodiment, the first actuation device 10 includes an axial thrust bearing 34. The axial thrust bearing 34 is positioned to abut against the translation gear 20 at one end opposite to the first pad 5.

[0125] Advantageously, the axial thrust bearing 34 allows the absorption of axial loads generated during the actuation of the first actuation device 10, i.e., loads pointing in a direction parallel to the first thrust axis 13.

[0126] According to an embodiment, the second actuation device 11 includes an axial thrust bearing 34, which is positioned against the second nut body 19 and is disposed opposite to the second push member 14.

[0127] Transmission system 9 The electric motor 8 includes a drive shaft 35.

[0128] According to the embodiment, the drive shaft 35 extends along an axis parallel to the first thrust axis 13.

[0129] According to one embodiment, the drive shaft 35 includes a drive wheel 36. Preferably, the drive wheel 36 is an outer wheel. The drive wheel 36 is rotatably connected to the drive shaft 35, or the drive wheel 36 is integrally formed with the drive shaft 36.

[0130] The drive wheel 36 meshes with the differential gear device 7 at least indirectly.

[0131] According to the embodiment, the drive wheel 36 is formed at one end of the drive shaft 35 facing the disk space.

[0132] According to the embodiment, the drive wheel 36 meshes indirectly or directly with the outer gear ring 29 of the planetary gear carrier body 28.

[0133] According to an embodiment, the transmission system 9 includes a first idler wheel 37.

[0134] The first idler gear 37 is positioned between the drive wheel 36 and the outer gear ring 29. Specifically, the first idler gear 37 meshes with both the drive wheel 36 and the outer gear ring 29.

[0135] According to this embodiment, the first idler wheel 37 extends coaxially with the axis parallel to the first thrust axis 13.

[0136] According to an embodiment, the transmission system 9 includes a driven shaft 38.

[0137] Driven shaft 38 is configured to receive mechanical power from differential gear device 7 and transmit the mechanical power to second actuation device 11.

[0138] According to the implementation method, the driven shaft 38 and the drive shaft 35 are positioned coaxially.

[0139] According to the embodiment, the driven shaft 38 extends through the disc space, and in particular, the driven shaft 38 extends through the disc space above the brake disc 4.

[0140] According to an embodiment, the driven shaft 38 includes a first driven wheel 39 and a second driven wheel 40 disposed opposite to it. Preferably, the first driven wheel 39 and the second driven wheel 40 are outer wheels. The first driven wheel 39 and / or the second driven wheel 40 are rotatably connected to the driven shaft 38, or the first driven wheel 39 and / or the second driven wheel 40 are integrally formed with the driven shaft 38.

[0141] According to the embodiment, the first driven wheel 39 and the second driven wheel 40 are formed at opposite ends of the driven shaft 38.

[0142] According to the embodiment, the first driven wheel 39 faces the drive wheel 36 of the drive shaft 35. The second driven wheel 40 is arranged opposite to the drive wheel 36.

[0143] According to the implementation method, the first driven wheel 39 is at least indirectly engaged with the transmission gear 21.

[0144] According to the implementation method, the first driven wheel 39 is at least indirectly engaged with the external transmission gear ring 33.

[0145] According to an embodiment, the transmission system 9 includes a second idler wheel 41.

[0146] The second idler gear 41 is positioned between the first driven gear 39 and the external transmission gear ring 33. Specifically, the second idler gear 41 meshes with both the first driven gear 39 and the external transmission gear ring 33.

[0147] According to this embodiment, the second idler wheel 41 extends coaxially with the axis parallel to the first thrust axis 13.

[0148] According to the embodiment, the second idler wheel 41 is positioned to face the first idler wheel 37 and is coaxial with the first idler wheel 37.

[0149] According to an embodiment, the second nut body 19 includes an outer nut ring wheel 42.

[0150] The outer nut ring wheel 42 is adapted to receive mechanical power from the differential gear device 7 and transmit the mechanical power to the second push member 14.

[0151] According to the embodiment, the outer nut ring wheel 42 extends coaxially with the second thrust axis 15. Specifically, the outer nut ring wheel 42 faces a radial direction opposite to the second thrust axis 15. Therefore, the outer nut ring wheel 42 is formed opposite to the inner nut thread portion 17.

[0152] According to the implementation method, the second driven wheel 40 is indirectly or directly engaged with the outer nut ring wheel 42.

[0153] According to an embodiment, the transmission device 9 includes a third idler wheel 43.

[0154] The third idler wheel 43 is positioned between the second driven wheel 40 and the outer nut ring wheel 42. Specifically, the third idler wheel 43 meshes with both the second driven wheel 40 and the outer nut ring wheel 42.

[0155] According to this embodiment, the third idler wheel 43 is coaxial with an axis parallel to the second thrust axis 15.

[0156] According to the implementation method, the third idler wheel 43 is positioned coaxially with the first idler wheel 37 and the second idler wheel 41.

[0157] According to an embodiment, the caliper 1 includes a plurality of first actuation devices 10 as described above and a plurality of second actuation devices 11 as described above.

[0158] According to an embodiment, the caliper 1 includes two first actuation devices 10 and two second actuation devices 11.

[0159] According to the embodiment, the two first actuation devices 10 are engaged with a single first idler wheel 37 and a single second idler wheel 41, and the first idler wheel 37 and the second idler wheel 41 are engaged with the drive shaft 35 and the driven shaft 38, respectively.

[0160] According to one embodiment, the axis around which the drive shaft 35, driven shaft 38, first idler wheel 37, and second idler wheel 41 are coaxially positioned lies in a plane that separates the two first actuation devices 10. This plane is transverse to the brake disc 4.

[0161] According to the embodiment, the two first actuation devices 10 are symmetrically positioned about the following plane: the axis around which the first idler wheel 37 and the second idler wheel 41 are coaxially positioned, the drive shaft 35, and the driven shaft 38 extend in the plane.

[0162] According to the embodiment, the two second actuation devices 11 engage with a single third idler wheel 43, which in turn engages with the driven shaft 38.

[0163] According to the embodiment, the axis around which the drive shaft 35, driven shaft 38, and first idler wheel 37, second idler wheel 41, and third idler wheel 43 are coaxially positioned lies in the plane separating the two second actuation devices 11. This plane is transverse to the brake disc 4.

[0164] According to the embodiment, the two second actuation devices 11 are positioned in a plane symmetrically such that the axis around which the third idler wheel 43 is coaxially positioned, the drive shaft 35, and the driven shaft 38 extend in the plane, or the axis around which the first idler wheel 37, the second idler wheel 41, and the third idler wheel 43 are coaxially positioned extends in the plane.

[0165] Disc brake 2 According to another aspect of the invention, the disc brake 2, particularly the BBW type disc brake 2, includes the caliper 1 as described above.

[0166] Furthermore, the disc brake 2 includes a brake disc 4. The brake disc 4 is housed in a disc space defined between a first pad 5 and a second pad 6 of the caliper 1.

[0167] According to the embodiment, the first pad 5 is the inner pad of the disc brake 2, and the second pad 6 is the outer pad of the disc brake 2. "Inner" means that the pad faces the inner surface of the brake disc 4, that is, the surface of the brake disc 4 facing the vehicle wheel hub, while "outer" means that the pad is arranged in the opposite direction and faces the outer surface of the brake disc 4, that is, the surface of the brake disc 4 facing away from the vehicle wheel hub.

[0168] According to the embodiment, at least one first actuation device 10, at least one first push member 12 and at least one first nut body 16 are positioned on the inner side of the brake disc 4, while at least one second actuation device 11, at least one second push member 14 and at least one second nut body 19 are positioned on the outer side of the brake disc 4.

[0169] Obviously, those skilled in the art will be able to make changes or adjustments to the present invention without departing from the scope of the appended claims.

[0170] List of reference numerals 1 caliper 2 disc brakes 3 caliper body 4 brake discs 5 First pad 6 Second pad 7 Differential Gear Unit 8 electric motors 9. Transmission System 10 First Actuation Device 11 Second Actuation Device 12 First Propulsion Component 13 First Thrust Axis 14 Second Propulsion Component 15 Second Thrust Axis 16 First Nut Body 17 Internal nut threaded section 18 External Lead Screw Thread Section 19 Second Nut Body 20 translational gears 21 Transmission Gears 22 planetary gears 23 Side translation teeth 24-side drive gear 25 planetary gear external teeth 26 planetary gear rotation axis 27 Planetary Gear Shaft 28 Planetary Gear Bearing Body 29 External gear ring 30 sliding surface 31 Mechanical retainer 32 through holes 33 External transmission gear ring 34 Axial Thrust Bearing 35 drive shafts 36 drive wheels 37 First idler wheel 38 driven shafts 39 First driven wheel 40 Second idler wheel 41 Second driven wheel 42 External Nut Ring Wheel 43 Third idler wheel 44 thrust surface 45 threaded shaft 46 Thrust wall.

Claims

1. A caliper (1) for a disc brake (2), said caliper (1) comprising a caliper body (3) adapted to be integrally connected to a stub axle of a vehicle, said caliper (1) comprising a first pad (5) and an oppositely disposed second pad (6) connected to said caliper body (3), wherein, The first pad (5) and the second pad (6) are spaced apart from each other and define a disc space to accommodate the brake disc (4). The caliper (1) includes an electric motor (8) and a transmission system (9), wherein the transmission system (9) is configured to transmit the mechanical power generated by the electric motor (8) to the first pad (5) and the second pad (6). The transmission system (9) includes a first actuation device (10) and a second actuation device (11). The first actuation device (10) is positioned at the first pad (5), and the first actuation device (10) is configured to drive the first pad (5) to translate toward the disk space. The second actuation device (11) is positioned at the second pad (6), and the second actuation device (11) is configured to drive the second pad (6) to translate toward the disk space. The transmission system (9) is characterized in that it includes a differential gear device (7) configured to achieve coupling and decoupling between the translation of the first pad (5) toward the disk space and the translation of the second pad (6) toward the disk space.

2. The caliper (1) according to claim 1, wherein, The differential gear device (7) is a planetary gear device.

3. The caliper (1) according to claim 1 or 2, wherein, The first actuation device (10) includes a first push member (12) extending along a corresponding first thrust axis (13), wherein the first push member (12) is positioned facing the first pad (5) and disposed opposite to the disk space, wherein by actuating the first actuation device (10), the first push member (12) can be actuated to translate along the first thrust axis (13) to abut against the first pad (5). The first actuation device (10) includes a first nut body (16), which is coaxially positioned with respect to the first thrust axis (13). The first actuating device (10) is configured such that rotation of the first nut body (16) about the first thrust axis (13) corresponds to translation of the first pushing member (12) along the first thrust axis (13). And among them, The second actuation device (11) includes a second push member (14) extending along a corresponding second thrust axis (15), wherein the second push member (14) is positioned facing the second pad (6) and disposed opposite to the disk space, wherein by actuating the second actuation device (11), the second push member (14) can be actuated to translate along the second thrust axis (15) to abut against the second pad (6). The second actuation device (11) includes a second nut body (19), which is coaxially positioned with respect to the second thrust axis (15). The second actuation device (11) is configured such that the rotation of the second nut body (19) about the second thrust axis (15) corresponds to the translation of the second push member (14) along the second thrust axis (15).

4. The caliper (1) according to any one of the preceding claims, wherein, The first actuation device (10) includes a first push member (12) extending along a corresponding first thrust axis (13), wherein the first push member (12) is positioned facing the first pad (5) and disposed opposite to the disk space, wherein by actuating the first actuation device (10), the first push member (12) can be actuated to translate along the first thrust axis (13) to abut against the first pad (5). The first actuation device (10) includes a first nut body (16), which is coaxially positioned with respect to the first thrust axis (13). The first actuating device (10) is configured such that rotation of the first nut body (16) about the first thrust axis (13) corresponds to translation of the first pushing member (12) along the first thrust axis (13). The first nut body (16) has an inner nut thread (17), which extends coaxially with the first thrust axis (13) and faces the first thrust axis (13). The first pushing member (12) has an external screw thread (18), which engages with the internal nut thread (17) of the first nut body (16), such that the rotation of the first nut body (16) about the first thrust axis (13) corresponds to the translation of the first pushing member (12) along the first thrust axis (13). And optionally, The second actuation device (11) includes a second pushing member (14) extending along a corresponding second thrust axis (15). The second pushing member (14) is positioned facing the second pad (6) and disposed opposite to the disk space. By actuating the second actuation device (11), the second pushing member (14) can be actuated to translate along the second thrust axis (15) to abut against the second pad (6). The second actuation device (11) includes a second nut body (19), which is coaxially positioned with respect to the second thrust axis (15). The second actuating device (11) is configured such that rotation of the second nut body (19) about the second thrust axis (15) corresponds to translation of the second pushing member (14) along the second thrust axis (15). The second nut body (19) has an inner nut thread (17), which extends coaxially with the second thrust axis (15) and faces the second thrust axis (15). The second push member (14) has an external screw thread (18), which engages with the internal nut thread (17) of the second nut body (19) so that the rotation of the second nut body (19) about the second thrust axis (15) corresponds to the translation of the second push member (14) along the second thrust axis (15).

5. The caliper (1) according to any one of the preceding claims, wherein, The first actuation device (10) includes a first push member (12) extending along a corresponding first thrust axis (13), wherein the first push member (12) is positioned facing the first pad (5) and disposed opposite to the disk space, wherein by actuating the first actuation device (10), the first push member (12) can be actuated to translate along the first thrust axis (13) to abut against the first pad (5). The first actuation device (10) includes a first nut body (16), which is coaxially positioned with respect to the first thrust axis (13). The first actuating device (10) is configured such that rotation of the first nut body (16) about the first thrust axis (13) corresponds to translation of the first pushing member (12) along the first thrust axis (13). The first pushing member (12) includes a threaded shaft (45) connected to a thrust wall (46), wherein the thrust wall (46) is fixed to one end of the threaded shaft (45) of the first pushing member (12) facing the first pad (5), wherein the thrust wall (46) defines a thrust surface (44) facing the first pad (5), and wherein the thrust surface (44) is at least partially knurled. And optionally, The second actuation device (11) includes a second pushing member (14) extending along a corresponding second thrust axis (15). The second pushing member (14) is positioned facing the second pad (6) and disposed opposite to the disk space. By actuating the second actuation device (11), the second pushing member (14) can be actuated to translate along the second thrust axis (15) to abut against the second pad (6). The second actuation device (11) includes a second nut body (19), which is coaxially positioned with respect to the second thrust axis (15). The second actuating device (11) is configured such that rotation of the second nut body (19) about the second thrust axis (15) corresponds to translation of the second pushing member (14) along the second thrust axis (15). The second push member (14) includes a threaded shaft (45) which is connected to a thrust wall (46), wherein the thrust wall (46) is fixed to one end of the threaded shaft (45) of the second push member (14) facing the second pad (6), wherein the thrust wall (46) defines a thrust surface (44) facing the second pad (6), and wherein the thrust surface (44) is at least partially knurled.

6. The caliper (1) according to any one of the preceding claims, wherein, The first actuation device (10) includes a first push member (12) extending along a corresponding first thrust axis (13), wherein the first push member (12) is positioned facing the first pad (5) and disposed opposite to the disk space, wherein by actuating the first actuation device (10), the first push member (12) can be actuated to translate along the first thrust axis (13) to abut against the first pad (5). The first actuation device (10) includes a first nut body (16), which is coaxially positioned with respect to the first thrust axis (13). The first actuating device (10) is configured such that rotation of the first nut body (16) about the first thrust axis (13) corresponds to translation of the first pushing member (12) along the first thrust axis (13). The differential gear device (7) includes a translation gear (20) positioned coaxial with and rotating about the first thrust axis (13). The differential gear device (7) is configured such that rotation of the translation gear (20) about the first thrust axis (13) corresponds to translation of the first push member (12) along the thrust axis (13). The differential gear device (7) includes a transmission gear (21) positioned coaxial with and rotating about the first thrust axis (13). The differential gear device (7) is configured such that rotation of the transmission gear (21) about the second thrust axis (13) corresponds to translation of the second push member (14) along the thrust axis (15). Preferably, the transmission gear (21) is positioned to be fitted onto the first nut body (16).

7. The caliper (1) according to claim 6, wherein, The differential gear device (7) includes at least one planetary gear (22) that meshes with the translation gear (20) and the transmission gear (21), wherein the at least one planetary gear (22) is configured to receive mechanical power from the electric motor (8) via the transmission system (9) and transmit the mechanical power to the translation gear (20) and the transmission gear (21).

8. The caliper (1) according to claim 6 or 7, wherein, The translation gear (20) is formed from the first nut body (16).

9. The caliper (1) according to claim 7, wherein, The first nut body (16) includes a lateral translation tooth (23), wherein the lateral translation tooth (23) extends coaxially with the first thrust axis (13) and faces the transmission gear (21), wherein the lateral translation tooth (23) meshes with the at least one planetary gear (22). The transmission gear (21) includes a side transmission tooth (24), wherein the side transmission tooth (24) extends coaxially with the first thrust axis (13) and faces the side translation tooth (23), wherein the side transmission tooth (24) meshes with the at least one planetary gear (22).

10. The caliper (1) according to claim 9, wherein, The at least one planetary gear (22) includes an external tooth portion (25), which directly meshes with the side translation tooth portion (23) and the side transmission tooth portion (24). The external tooth portion (25) extends coaxially with and rotates about the planetary gear rotation axis (26). The external tooth portion (25) is integral with the planetary gear (22) and is radially relative to the first thrust axis (13). Optionally, the at least one planetary gear (22) includes a planetary gear shaft (27) which is fixed to the external gear portion (25) and extends along the planetary gear rotation axis (26) in a direction opposite to the first thrust axis (13).

11. The caliper (1) according to claim 7, wherein, The differential gear device (7) includes a planetary gear carrier body (28), wherein the planetary gear carrier body (28) is connected to the at least one planetary gear (22) to receive mechanical power from the electric motor (8) and transmit the mechanical power to the at least one planetary gear (22). The planetary gear carrier body (28) drives at least one planetary gear (22) to rotate around the first thrust axis (13). And therein, the planetary gear carrier body (28) is positioned in a manner that is coaxial with the first thrust axis (13) and rotates about the first thrust axis (13).

12. The caliper (1) according to claim 11, wherein, The at least one planetary gear (22) includes an external tooth portion (25) that directly meshes with the side translation tooth portion (23) and the side drive tooth portion (24), wherein the external tooth portion (25) extends coaxially with and rotatably about the planetary gear rotation axis (26), the external tooth portion (25) is integral with the planetary gear (22) and is radially relative to the first thrust axis (13), and wherein the at least one planetary gear (22) includes a planetary gear shaft (27) fixed to the external tooth portion (25) and extending along the planetary gear rotation axis (26) in a direction opposite to the first thrust axis (13). The planetary gear carrier body (28) is formed with at least one through hole (32) for rotatably accommodating the corresponding planetary gear shaft (27) of the at least one planetary gear (22), and wherein the at least one through hole (32) extends along the rotation axis (26) of the planetary gear.

13. The caliper (1) according to claim 7, wherein, The differential gear device (7) includes multiple planetary gears (22). Alternatively, the differential gear device (7) may include two planetary gears (22) arranged at a corresponding angular distance of 180°. Alternatively, the differential gear device (7) may include three planetary gears (22) arranged at corresponding angular distances of 120°. Alternatively, the differential gear device (7) may include four planetary gears (22) arranged at corresponding angular distances of 90°.

14. The caliper (1) according to claim 11, wherein, The planetary gear carrier body (28) includes an outer gear ring (29) adapted to receive mechanical power from the electric motor (8) and transmit the mechanical power to the at least one planetary gear (22), wherein the outer gear ring (29) extends coaxially with the first thrust axis (13).

15. The caliper (1) according to claim 9, wherein, The first nut body (16) defines a sliding surface (30) that extends coaxially with the first thrust axis (13), wherein the sliding surface (30) faces a direction opposite to the first thrust axis (13). The lateral translation tooth (23) extends protruding from the sliding surface (30). The transmission gear (21) is mounted on the sliding surface (30) such that the side transmission tooth (24) is rotatably mounted on the sliding surface (30) and faces the side translation tooth (23). The at least one planetary gear (22) is positioned to face the sliding surface (30). Optionally, the outer teeth (25) of the at least one planetary gear (22) are configured to contact the sliding surface (30).

16. The caliper (1) according to claims 9 and 11, wherein, The planetary gear carrier body (28) is at least partially fitted onto the side drive gear (24) and the side translation gear (23). Alternatively, the planetary gear carrier body (28) may include an outer gear ring (29) adapted to receive mechanical power from the electric motor (8) and transmit the mechanical power to the at least one planetary gear (22), wherein the outer gear ring (29) extends coaxially with the first thrust axis (13), and wherein the planetary gear carrier body (28) is positioned such that the outer gear ring (29) is at least partially fitted onto the side drive gear (24), preferably, the outer gear ring (29) is fully fitted onto the side drive gear (24).

17. The caliper (1) according to claim 11, wherein, The differential reduction gear device (7) is configured such that: - The axial volume occupied by the planetary gear carrier body (28) is entirely within the axial volume occupied by the translation gear (20) and the transmission gear (21), or - The axial volume occupied by the transmission gear (21) is entirely within the axial volume occupied by the translation gear (20), or - The axial volume occupied by both the planetary gear carrier body (28) and the transmission gear (21) is completely located within the axial volume occupied by the translation gear (20).

18. The caliper (1) according to claim 6, wherein, The transmission gear (21) includes an external transmission gear ring (33) adapted to transmit mechanical power to at least one second push member (14) via the transmission system (9), wherein the external transmission gear ring (33) extends coaxially with the first thrust axis (13).

19. The caliper (1) according to claims 14 and 18, wherein, The external transmission gear ring (33) faces the external gear ring (29) of the planetary gear carrier body (28) along an axial direction parallel to the first thrust axis (13). Optionally, with reference to the first thrust axis (13), the radial volume occupied by the external transmission gear ring (33) is substantially equal to the radial volume occupied by the external gear ring (29).

20. The caliper (1) according to claim 6, wherein, The transmission system (9) includes a mechanical retainer (31) configured to prevent axial movement of the transmission gear (21), wherein the mechanical retainer (31) is a locking ring that is interference-fitted to the translation gear (30) at the transmission gear (21). Optionally, the locking ring is positioned facing the external transmission gear ring (33) and disposed opposite to the external gear ring (29) of the planetary gear carrier body (28), and the locking ring is housed in a circumferential seat formed in the translation gear (20), the circumferential seat being located at one end of the sliding surface (30) of the translation gear (20) facing the first pad (5).

21. The caliper (1) according to any one of the preceding claims, wherein, The electric motor (8) includes a drive shaft (35) extending along an axis parallel to the first thrust axis (13), wherein the drive shaft (35) includes a drive wheel (36) that meshes at least indirectly with the differential gear assembly (7), and wherein the drive wheel (36) is formed at one end of the drive shaft (35) facing the disk space. Optionally, the drive wheel (36) meshes indirectly or directly with the outer gear ring (29) of the planetary gear carrier body (28). Optionally, the transmission system (9) includes a first idler wheel (37) that meshes with both the drive wheel (36) and the external gear ring (29), and wherein the first idler wheel (37) extends coaxially with an axis parallel to the first thrust axis (13).

22. The caliper (1) according to claim 21, wherein, The transmission system (9) includes a driven shaft (38) configured to receive mechanical power from the differential gear assembly (7) and transmit the mechanical power to the second actuation device (11), wherein the driven shaft (38) is coaxially positioned with the drive shaft (35), and wherein the driven shaft (38) extends through the disk space.

23. The caliper (1) according to claims 6 and 22, wherein, The driven shaft (38) includes a first driven wheel (39) and a second driven wheel (40) disposed opposite to each other, wherein the first driven wheel (39) and the second driven wheel (40) are formed at two opposite ends of the driven shaft (38). The first driven wheel (39) faces the drive wheel (36) of the drive shaft (35), and the second driven wheel (40) is arranged opposite to the drive wheel (36). The first driven wheel (39) meshes with the transmission gear (21) at least indirectly. Optionally, the first driven wheel (39) meshes with the external transmission gear ring (33) at least indirectly. Optionally, the transmission system (9) includes a second idler wheel (41) that meshes with both the first driven wheel (39) and the external transmission gear ring (33), wherein the second idler wheel (41) extends coaxially with an axis parallel to the first thrust axis (13) and the second idler wheel (41) is coaxial with the first idler wheel (37).

24. The caliper (1) according to claim 23, wherein, The second nut body (19) includes an outer nut ring wheel (42) adapted to receive mechanical power from the differential gear device (7) and transmit the mechanical power to the second push member (14), wherein the outer nut ring wheel (42) extends coaxially with the second thrust axis (15). The second driven wheel (40) of the driven shaft (38) meshes indirectly or directly with the outer nut ring wheel (42). Optionally, the transmission system (9) includes a third idler wheel (43) that meshes with both the second driven wheel (40) and the outer nut ring wheel (42), wherein the third idler wheel (43) extends coaxially with an axis parallel to the second thrust axis (15), and wherein the third idler wheel (43) is coaxially positioned with the first idler wheel (37) and the second idler wheel (41).

25. The caliper (1) according to any one of the preceding claims, the caliper (1) comprising a plurality of first actuation devices (10) and a plurality of second actuation devices (11), preferably, the caliper (1) comprising two first actuation devices (10) and two second actuation devices (11).

26. The caliper (1) according to claims 22 and 25, wherein, The two first actuation devices (10) are symmetrically positioned about the following plane: the first idler wheel (37) and the second idler wheel (41) are coaxially positioned around the axis around which the drive shaft (35) and the driven shaft (38) extend.

27. The caliper (1) according to claims 22 and 25, wherein, Two second actuating devices (11) engage with a single third idler wheel (43), which engages with the driven shaft (38), and wherein the two second actuating devices (11) are symmetrically positioned about a plane around which the third idler wheel (43) is coaxially positioned, the drive shaft (35), and the driven shaft (38) extend in the plane.

28. A disc brake (2), said disc brake (2) comprising a brake disc (4) and a caliper (1) according to any one of the preceding claims, wherein, The brake disc (4) is housed in the disc space defined between the first pad (5) and the second pad (6) of the caliper (1). Preferably, the first pad (5) is the inner pad of the disc brake (2), and the second pad (6) is the outer pad of the disc brake (2).

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