Disc brake

Abstract

The present disclosure relates to a disc brake, the disc brake comprising a brake disc, a brake caliper, and an elastic return device. The brake caliper has a caliper body and a brake pad assembly accommodated in the caliper body. The elastic return device is arranged across the brake disc, and, when the braking action of the disc brake is stopped, the elastic return device applies an elastic action to the brake pad assembly so as to bias the brake pad assembly away from the brake disc. The brake caliper has an elongated shaft mounted at the radial outer side portion of the caliper body, the elongated shaft extending substantially in the axial direction and being arranged on the outer side of the brake pad assembly in the radial direction. The elastic return device comprises a mounting portion and a biasing action portion connected to the mounting portion, wherein the mounting portion is detachably connected to the elongated shaft, and the biasing action portion is configured to abut against the brake pad assembly, so as to apply elastic biasing forces to the brake pad assembly at least in the axial direction and the radial direction.

Description

disc brakes

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to Chinese patent application number 2023117097304, filed with the Chinese Patent Office on December 13, 2023, and entitled “Disc Brake,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to a disc brake, and more particularly to a disc brake including an elastic return device for applying elastic action to a friction pad assembly to bias the friction pad assembly away from a brake disc when the braking action of the disc brake ceases. Background Art

[0004] This section provides background information related to the present disclosure but does not necessarily constitute prior art.

[0005] During vehicle braking, the braking force is typically provided by friction between the friction material of the friction pad assembly and the brake disc. Some related art disc brakes are equipped with a return spring. After the brake pedal is released, the return spring biases the friction pad assembly of the brake caliper back to its initial position. In other words, the return spring biases the two opposing friction pad assemblies away from each other after braking, ensuring that the friction material separates from the brake disc after each braking action.

[0006] In some related technical solutions, the return spring occupies a relatively large installation space. For example, a brake caliper includes a central bridge portion, to which at least a portion of the return spring is fixedly connected. The central bridge portion is configured to span the brake disc and friction pad assembly. The central bridge portion is integrally formed with the caliper body in a non-detachable manner. For example, the central bridge portion may be integrally formed with the caliper body through a casting process. This makes the brake caliper difficult to disassemble and assemble, hindering the rapid disassembly and replacement of the friction pad assembly within the caliper body.

[0007] Therefore, there is an urgent need for an elastic return device that is more compact in structure and convenient to install, and a disc brake including the elastic return device. Summary of the Invention

[0008] This section provides a general summary of the disclosure, and is not a comprehensive disclosure of its full scope or all of its features.

[0009] In view of the problems existing in the above conventional technology, there is a need to improve the relevant disc brake to overcome or alleviate all or at least part of the above technical problems.

[0010] In some exemplary embodiments of the present disclosure, a disc brake is provided, comprising a brake disc, a brake caliper, and an elastic return device. The brake disc is configured to rotate about a rotational axis, and the brake disc defines an axial direction parallel to the rotational axis, a radial direction perpendicular to the rotational axis, and a tangential direction perpendicular to both the axial and radial directions. The brake caliper comprises a caliper body and a friction pad assembly housed in the caliper body. The elastic return device is arranged to straddle the brake disc, and when the braking action of the disc brake ceases, the elastic return device applies an elastic force to the friction pad assembly to bias the friction pad assembly away from the brake disc.

[0011] The brake caliper may have an elongated shaft mounted at the radially outer portion of the caliper body, the elongated shaft extending substantially in the axial direction and being arranged radially on the outer side of the friction pad assembly, the elastic return device may include a mounting portion and a biasing portion connected to the mounting portion, the mounting portion being detachably connected to the elongated shaft, the biasing portion may be configured to abut the friction pad assembly to apply an elastic biasing force to the friction pad assembly at least in the axial and radial directions.

[0012] According to the elastic return device provided by the present disclosure, the mounting portion of the elastic return device is detachably connected to the corresponding elongated shaft. Compared with the technical solution in the related art in which the elastic return device is mounted on a central bridge-shaped portion on the caliper body, the present disclosure can mount the elastic return device on a mounting shaft (e.g., a pin) on the caliper body in a relatively simple and compact manner, thereby achieving a firm and durable connection between the elastic return device and the caliper body. In addition, since there is no need to provide a central bridge-shaped portion on the caliper body, the number of parts of the brake caliper is reduced, the complexity of the brake caliper body is reduced, and the manufacturing process is simplified. In addition, since the manufacturing material is reduced, the manufacturing cost is reduced, and the brake caliper body is made lighter. When replacing a worn friction pad assembly in the brake caliper of the present disclosure, the friction pad assembly can be quickly disassembled and replaced by disassembling the mounting shaft straddling the friction pad assembly, thereby improving the efficiency of the replacement operation.

[0013] In some exemplary embodiments of the present disclosure, the elongated shaft may include a first elongated shaft and a second elongated shaft, and the first elongated shaft and the second elongated shaft may be arranged parallel to each other and spaced apart from each other in a circumferential direction of the caliper body. The mounting portion of the elastic return device may include a first mounting arm portion connected to the first elongated shaft, a second mounting arm portion connected to the second elongated shaft, and a first central portion located between the first mounting arm portion and the second mounting arm portion.

[0014] In some exemplary embodiments of the present disclosure, a friction pad assembly may include a first friction pad assembly and a second friction pad assembly, the first friction pad assembly having a first support plate and a first friction material member mounted on the first support plate, and the second friction pad assembly having a second support plate and a second friction material member mounted on the second support plate. The first friction pad assembly and the second friction pad assembly may be arranged axially opposite to each other, and a biasing portion of the elastic return device may include a first biasing arm configured to abut the first support plate, a second biasing arm configured to abut the second support plate, and a second central portion located between the first biasing arm and the second biasing arm. The first central portion of the mounting portion is connected to the second central portion of the biasing portion.

[0015] The elastic return device provided by the present disclosure comprises two mounting arms and two biasing arms, formed in a generally cross shape. The two mounting arms are used to simply and compactly secure the elastic return device to an elongated shaft mounted on a caliper body. The two biasing arms are arranged on opposite sides of a second central portion of the biasing portion, and are capable of applying a resilient force to the friction pad assembly in a relatively stable manner, biasing the friction pad assembly to move away from the brake disc.

[0016] In some exemplary embodiments of the present disclosure, an opening is formed on a radially outer portion of the caliper body, exposing at least a portion of the first and second friction pad assemblies. The caliper body may be provided with first and second mounting holes for receiving the first elongated shaft, and third and fourth mounting holes for receiving the second elongated shaft. The first and second mounting holes are axially aligned and disposed on opposite sides of the opening in the caliper body.

[0017] In some exemplary embodiments of the present disclosure, the third mounting hole and the fourth mounting hole can be aligned in the axial direction, and the third mounting hole is spaced apart from the first mounting hole in the circumferential direction of the caliper body, and the fourth mounting hole is spaced apart from the second mounting hole in the circumferential direction of the caliper body, and the third mounting hole and the fourth mounting hole can be respectively arranged on opposite sides of the opening of the caliper body in the axial direction.

[0018] In some exemplary embodiments of the present disclosure, the opening of the caliper body may be formed to include a first elongated side portion and a second elongated side portion that are axially opposed to each other, the first mounting hole and the third mounting hole may be disposed adjacent to the first elongated side portion, and the second mounting hole and the fourth mounting hole may be disposed adjacent to the second elongated side portion. Each of the first and second elongated shafts may include a first end portion and a second end portion that are opposite to each other, the first end portion being formed as a tapered tip, an annular recess being disposed near the second end portion, and a resilient connector being mounted in the annular recess.

[0019] In some exemplary embodiments of the present disclosure, the first mounting hole is fixedly connected to the elastic connecting member mounted on the first elongated shaft in an interference fit manner, and the first end portion of the first elongated shaft is inserted through the second mounting hole, and the third mounting hole is fixedly connected to the elastic connecting member mounted on the second elongated shaft in an interference fit manner, and the first end portion of the second elongated shaft is inserted through the fourth mounting hole.

[0020] According to an exemplary embodiment of the present disclosure, the elongated shaft may be securely mounted on the caliper body by interference fitting an elastic connector provided at one end portion of each elongated shaft with a corresponding mounting hole.

[0021] In some exemplary embodiments of the present disclosure, the first elongated shaft may include a first intermediate connecting portion located between the first end portion and the second end portion, and the first intermediate connecting portion may be configured to connect to the first mounting arm portion of the elastic return device.

[0022] A first recessed portion is provided at a radially outer portion of the first support plate of the first friction pad assembly, and a second recessed portion is provided at a radially outer portion of the second support plate of the second friction pad assembly. The first mounting hole, the first recessed portion, the second recessed portion, and the second mounting hole are arranged in a row in the axial direction, and the first elongated shaft is arranged to extend through the first recessed portion, the second recessed portion, and the second mounting hole.

[0023] In some exemplary embodiments of the present disclosure, the diameter of the first intermediate connecting portion may be set to be smaller than the diameter of the portion of the first elongated shaft passing through the first notch portion and smaller than the diameter of the portion of the first elongated shaft passing through the second notch portion.

[0024] In some exemplary embodiments of the present disclosure, the second elongated shaft may include a second intermediate connecting portion located between the first end portion and the second end portion thereof, the second intermediate connecting portion being configured to connect to the second mounting arm portion of the elastic return device.

[0025] A third recessed portion may be provided at a radially outer portion of the first support plate of the first friction pad assembly, and a fourth recessed portion may be provided at a radially outer portion of the second support plate of the second friction pad assembly, the third mounting hole, the third recessed portion, the fourth recessed portion and the fourth mounting hole are arranged in a row in the axial direction, and the second elongated shaft is arranged to extend through the third recessed portion, the fourth recessed portion and the fourth mounting hole.

[0026] In some exemplary embodiments of the present disclosure, the diameter of the second intermediate connecting portion may be set to be smaller than the diameter of the portion of the second elongated shaft passing through the third notch portion and smaller than the diameter of the portion of the second elongated shaft passing through the fourth notch portion.

[0027] In some exemplary embodiments of the present disclosure, the first mounting arm portion of the mounting portion may be provided with a first winding portion fixedly connected to the first intermediate connecting portion of the first elongated shaft, and the first winding portion may be wound around at least a portion of the first intermediate connecting portion and conform to at least a portion of the outer circumferential surface of the first intermediate connecting portion; or

[0028] The first mounting arm portion of the mounting portion may be provided with a first clip portion fixedly connected to the first intermediate connecting portion of the first elongated shaft, and the first clip portion may include: a first protrusion extending toward the first central portion of the mounting portion; a first clip band portion connected to the first protrusion and angled relative to the first protrusion; and a concave accommodating portion connected to the first clip band portion, the first intermediate connecting portion of the first elongated shaft may be at least partially received in a space defined by the first concave accommodating portion, the first clip band portion and the first protrusion, and the first protrusion and the first mounting arm portion are formed as an integral piece.

[0029] In some exemplary embodiments of the present disclosure, the second mounting arm portion of the mounting portion may be provided with a second winding portion fixedly connected to the second intermediate connecting portion of the second elongated shaft, and the second winding portion is wound around at least a portion of the second intermediate connecting portion and is in contact with at least a portion of the outer circumferential surface of the second intermediate connecting portion.

[0030] In some other exemplary embodiments of the present disclosure, the second mounting arm portion of the mounting portion may be provided with a second clip portion fixedly connected to the second intermediate connecting portion of the second elongated shaft, and the second clip portion may include a second protrusion extending toward the first central portion of the mounting portion; a second clip band portion connected to the second protrusion and angled relative to the second protrusion; and a second concave accommodating portion connected to the second clip band portion, the second intermediate connecting portion of the second elongated shaft is at least partially received in the space defined by the second concave accommodating portion, the second clip band portion and the second protrusion, and the second protrusion and the second mounting arm portion are formed as an integral piece.

[0031] In some exemplary embodiments of the present disclosure, the second elongated axis can be arranged to be mirrored with the first elongated axis with respect to the first plane of symmetry, the first mounting hole can be arranged to be mirrored with the third mounting hole with respect to the first plane of symmetry, and the second mounting hole can be arranged to be mirrored with the fourth mounting hole with respect to the first plane of symmetry, and the first plane of symmetry is defined as passing through the axial center axis of the elastic return device and being perpendicular to the tangential center axis of the elastic return device.

[0032] By arranging the two elongated shafts and four mounting holes of the present invention into a substantially symmetrical configuration about the first symmetry plane, better structural stability is provided, and batch production of various components is facilitated, thereby facilitating manufacturing and having good cost-effectiveness.

[0033] In some exemplary embodiments of the present disclosure, each of the first mounting arm portion and the second mounting arm portion can be formed to have a corrugated shape in a cross-section perpendicular to the axial direction, and can have a plurality of strip portions, and two adjacent strip portions among the plurality of strip portions are formed to have a U-shape or a V-shape in a cross-section perpendicular to the axial direction.

[0034] In some exemplary embodiments of the present disclosure, the multiple band portions of each of the first mounting arm portion and the second mounting arm portion may include: a first band portion, a second band portion, a third band portion and a snap-on band portion, the first band portion extends from a first central portion of the mounting portion in a direction toward the radial inside, a first rounded corner portion is provided between the first band portion and the second band portion, a second rounded corner portion is provided between the second band portion and the third band portion, a first concave accommodating portion is provided between the third band portion and the snap-on band portion, the first rounded corner portion and the first concave accommodating portion are formed as a trough portion of a corresponding one of the first mounting arm portion and the second mounting arm portion in a cross-section perpendicular to the axial direction, the second rounded corner portion is formed as a peak portion of a corresponding one of the first mounting arm portion and the second mounting arm portion in a cross-section perpendicular to the axial direction, and the first concave accommodating portion is at least partially in contact with a corresponding one of the first elongated axis and the second elongated axis.

[0035] In some exemplary embodiments of the present disclosure, the first mounting arm portion may be arranged to be mirrored with the second mounting arm portion about a first symmetry plane defined as passing through the axial center axis of the elastic return device and perpendicular to the tangential center axis of the elastic return device.

[0036] In some exemplary embodiments of the present disclosure, the first support plate may include a first edge portion, which is arranged at a central portion of the radially outer portion of the first support plate in the circumferential direction of the caliper body, and the first biasing arm portion of the elastic return device may be configured to abut against the first edge portion to exert an elastic action on the first edge portion, thereby biasing the first support plate and the first friction material member away from the brake disc in the axial direction.

[0037] The second support plate may include a second edge portion, which may be arranged at a central portion of the radially outer portion of the second support plate in the circumferential direction of the caliper body, and the second biasing arm portion of the elastic return device may be configured to abut against the second edge portion to exert an elastic action on the second edge portion, thereby biasing the second support plate and the second friction material member away from the brake disc in the axial direction.

[0038] In some exemplary embodiments of the present disclosure, each of the first bias arm and the second bias arm of the elastic return device can be formed into a band shape, and each of the first bias arm and the second bias arm can include: a first arc portion, a band extension portion, a second arc portion and a bias inclined portion, the first arc portion is connected to the second central portion and extends from the second central portion in a direction toward the radial inside, the band extension portion is connected to the first arc portion and extends in a plane substantially perpendicular to the axial direction, the bias inclined portion is at an angle relative to the band extension portion in a cross section passing through the center point of the elastic return device and perpendicular to the tangential center axis of the elastic return device, and the second arc portion is arranged between the band extension portion and the bias inclined portion and connects the band extension portion with the bias inclined portion.

[0039] In some exemplary embodiments of the present disclosure, a first orifice may be provided at the second arcuate portion of each of the first bias arm portion and the second bias arm portion, the first orifice may include a first radially inner edge portion and a second radially outer edge portion opposite to each other, the first radially inner edge portion being arranged adjacent to the biasing inclined portion, each of the first bias arm portion and the second bias arm portion including a first overhang extending from the second radially outer edge portion of the first orifice in a manner parallel to the band-shaped extension portion, the first overhang being configured to limit the radially inward movement of each of the first bias arm portion and the second bias arm portion.

[0040] In some exemplary embodiments of the present disclosure, each of the first edge portion of the first support plate and the second edge portion of the second support plate may be formed to have an arc shape in a cross section perpendicular to the axial direction.

[0041] In some exemplary embodiments of the present disclosure, the biased inclined portion may be configured to abut against an edge portion of a corresponding one of the first support plate and the second support plate in a point-contact manner.

[0042] In some exemplary embodiments of the present disclosure, a second orifice is provided at a portion of the band-shaped extension of each of the first biasing arm portion and the second biasing arm portion connected to the second arc-shaped portion, the second orifice may include a third radially inner edge portion and a fourth radially outer edge portion opposite to each other, the third radially inner edge portion is arranged to be adjacent to the biasing inclined portion, each of the first biasing arm portion and the second biasing arm portion includes a second overhang portion protruding from the third radially inner edge portion of the second orifice in a manner parallel to the biasing inclined portion, and the second overhang portion may be configured to limit the radial inward movement of each of the first biasing arm portion and the second biasing arm portion.

[0043] In some exemplary embodiments of the present disclosure, the second biasing arm portion can be arranged to be a mirror image of the first biasing arm portion about a second symmetry plane, and the second symmetry plane can be defined as passing through the tangential center axis of the elastic return device and perpendicular to the axial center axis of the elastic return device.

[0044] In some exemplary embodiments of the present disclosure, the first central portion of the mounting portion and the second central portion of the biasing portion are connected by a rivet. The rivet allows for a quick, secure connection between the mounting portion and the biasing portion of the elastic return device, ensuring a reliable connection between the mounting portion and the biasing portion, and improving the elastic return device's vibration and impact resistance.

[0045] The above features and advantages and other features and advantages of the present disclosure will become more apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In all the drawings, the same or corresponding technical features or components will be represented by the same or corresponding reference numerals. In the drawings, the sizes and relative positions of the components are not necessarily drawn to scale. In the drawings:

[0047] FIG. 1 is a schematic perspective view of a disc brake according to an exemplary embodiment of the present disclosure.

[0048] FIG. 2 is a schematic exploded perspective view of a brake caliper of a disc brake according to an exemplary embodiment of the present disclosure.

[0049] 3 is a schematic perspective view of a disc brake according to an exemplary embodiment of the present disclosure, wherein the first elongated shaft, the second elongated shaft, and the elastic return device are removed.

[0050] FIG. 4 is a schematic top view of the disc brake shown in FIG. 3 according to the exemplary embodiment of the present disclosure.

[0051] 5 is a schematic perspective view of a first elongated shaft and a second elongated shaft of a disc brake according to an exemplary embodiment of the present disclosure.

[0052] 6 is a schematic perspective view of a first elongated shaft, a second elongated shaft, and a friction pad assembly of a disc brake according to an exemplary embodiment of the present disclosure.

[0053] 7 is a schematic perspective view of a first elongated shaft, a second elongated shaft, a friction pad assembly, and an elastic return device of a disc brake according to another exemplary embodiment of the present disclosure.

[0054] FIG. 8 is a top view of an elastic return device according to an exemplary embodiment of the present disclosure.

[0055] 9 is a schematic perspective view of a first elongated shaft, a second elongated shaft, and a mounting portion of an elastic return device of a disc brake according to an exemplary embodiment of the present disclosure.

[0056] FIG10 is a schematic diagram of the first elongated shaft, the second elongated shaft, and the mounting portion of the elastic return device of the disc brake shown in FIG9 , viewed along the axial direction.

[0057] FIG. 11 is a schematic perspective view of a portion of a biasing portion of an elastic return device of a disc brake according to an exemplary embodiment of the present disclosure.

[0058] FIG. 12 is a schematic perspective view of an elastic return device of a disc brake according to another exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0059] The present disclosure will be described in detail below with reference to the accompanying drawings with the aid of exemplary embodiments. It should be noted that the exemplary embodiments of the present disclosure are intended to enable a person of ordinary skill in the art to easily implement the present disclosure, and the various embodiments of the present disclosure can be implemented in many different forms and should not be construed as being limited to the embodiments set forth in the present disclosure. Accordingly, the following detailed description of the present disclosure is merely for illustrative purposes and is by no means a limitation of the present disclosure. In addition, the same figure numbers are used in the various drawings to represent the same components. In addition, the terms "first", "second", etc. are only for ease of description and are not to be understood as indicating or implying relative importance or relative order.

[0060] It should also be noted that, for the sake of clarity, not all features of the actual specific implementation are described and shown in the specification and drawings. Moreover, in order to avoid unnecessary details obscuring the technical solutions focused on by the present disclosure, only the device structures closely related to the technical solutions of the present disclosure are described and shown in the drawings and the specification, while other details that are not closely related to the technical content of the present disclosure and are known to those skilled in the art are omitted.

[0061] Next, an exemplary embodiment of a disc brake according to the present disclosure will be described in detail with reference to the accompanying drawings. The disc brake 1 may include a brake disc 10 (refer to FIG4 ), a brake caliper 20 and an elastic return device 200. The brake disc 10 may be mounted on the wheel hub and rotate together with the wheel. As shown in FIG1 to FIG4 , the wheel and the brake disc 10 are configured together to rotate about a rotation axis XX. The brake disc 10 may be defined by an axial direction AA parallel to the rotation axis XX, a radial direction RR perpendicular to the rotation axis XX, and a tangential direction BB perpendicular to both the axial direction AA and the radial direction RR. For clarity and conciseness of the description, the rotation axis XX, the axial direction AA, the radial direction RR, the tangential direction BB and the circumferential direction CC are marked in the figures. The circumferential direction CC generally refers to the circumferential direction of the caliper body of the brake caliper.

[0062] It should be understood that the terms "axial", "radial", "inner", "outer", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0063] In some exemplary embodiments of the present disclosure, as shown in Figures 1 to 4, the brake caliper 20 may have a caliper body 201 and a friction pad assembly accommodated in the caliper body 201, the elastic return device 200 may be arranged to straddle the brake disc 10, and the elastic return device 200 applies an elastic action to the friction pad assembly to bias the friction pad assembly away from the brake disc 10 when the braking action of the disc brake 1 stops.

[0064] The brake caliper 20 may have an elongated shaft mounted at the radially outer portion of the caliper body 201, the elongated shaft extending substantially along the axial direction AA and being arranged on the outer side of the friction pad assembly in the radial direction RR, the elastic return device 200 may include a mounting portion 22 and a biasing portion 24 connected to the mounting portion 22, the mounting portion 22 being detachably connected to the elongated shaft, the biasing portion 24 being configured to abut the friction pad assembly to apply an elastic biasing force to the friction pad assembly at least in the axial direction AA and the radial direction RR.

[0065] According to the elastic return device disclosed herein, the mounting portion of the elastic return device is detachably connected to the corresponding elongated shaft. Compared to related art solutions that mount the elastic return device (also known as a return spring) on ​​a central bridge portion of the caliper body, the present invention allows for a relatively simple and compact mounting of the elastic return device on a mounting shaft (e.g., a pin) located on the caliper body, thereby achieving a secure and durable connection between the elastic return device and the caliper body. Furthermore, since the central bridge portion is not required on the caliper body, the number of components in the brake caliper is reduced, reducing the complexity of the brake caliper body and simplifying the manufacturing process. Furthermore, since the manufacturing material of the caliper body is reduced, manufacturing costs are reduced and the caliper body is made lighter. In particular, when replacing a worn friction pad assembly in the brake caliper disclosed herein, the friction pad assembly can be quickly removed and replaced by removing the mounting shaft that straddles the friction pad assembly, thereby improving the efficiency of the replacement operation.

[0066] In some exemplary embodiments, the elastic return device can be made of a metal elastic element. The metal elastic element can be formed from a thin plate, a strip, a metal wire, etc. The elastic return device made of a metal elastic element can have good strength and toughness, can withstand large tensile or compressive loads, and has a long service life and stable performance. In addition, the metal elastic element has good elasticity, can deform under the action of an external force, and return to its original shape when the external force disappears. The friction pad assembly is elastically preloaded by the elastic return device 200 so that the friction pad assembly is spaced apart from the brake disc 10 when the disc brake is deactivated, thereby effectively preventing unwanted friction between the friction pad assembly and the brake disc 10 when the brake is deactivated, thereby reducing or eliminating the residual braking torque (residual torque) caused by unwanted contact between the friction pad assembly and the brake disc, thereby reducing the vehicle's fuel consumption and / or power consumption.

[0067] In some exemplary embodiments, as shown in Figures 1 and 2, the elongated shaft may include a first elongated shaft 101 and a second elongated shaft 103, which are arranged parallel to each other and spaced apart from each other in the circumferential direction CC of the caliper body 201. The mounting portion 22 of the elastic return device 200 may include a first mounting arm portion 221 connected to the first elongated shaft 101, a second mounting arm portion 223 connected to the second elongated shaft 103, and a first central portion 222 located between the first mounting arm portion 221 and the second mounting arm portion 223.

[0068] In some exemplary embodiments, as shown in FIG2 , the friction pad assembly may include a first friction pad assembly and a second friction pad assembly. The first friction pad assembly includes a first support plate 31 and a first friction material member 32 mounted on the first support plate 31. The second friction pad assembly includes a second support plate 33 and a second friction material member 34 mounted on the second support plate. The first and second friction pad assemblies are arranged opposite each other in the axial direction AA. The biasing portion 24 of the elastic return device 200 may include a first biasing arm 241 configured to abut against the first support plate 31, a second biasing arm 243 configured to abut against the second support plate 33, and a second central portion 242 located between the first and second biasing arms. The first central portion 222 of the mounting portion 22 is connected to the second central portion 242 of the biasing portion 24.

[0069] According to the elastic return device provided by the present disclosure, the elastic return device having two mounting arms and two biasing arms is formed in a roughly cross shape, and the two biasing arms are arranged on opposite sides of the second central portion 242 of the biasing action portion 24, so as to apply an elastic force to the friction pad assembly in a relatively stable manner to reliably bias the friction pad assembly to move away from the brake disc.

[0070] In some exemplary embodiments, as shown in Figures 2 to 4 , the caliper body 201 has an opening 206 formed on the radially outer portion 215, exposing at least a portion of the first and second friction pad assemblies. The caliper body 201 may be provided with a first mounting hole 230 and a second mounting hole 231 for receiving the first elongated shaft 101, as well as a third mounting hole 232 and a fourth mounting hole 233 for receiving the second elongated shaft 103. As shown in Figure 3 , the first mounting hole 230 and the second mounting hole 231 are aligned in the axial direction AA and are respectively arranged on opposite sides of the opening 206 of the caliper body 201 in the axial direction. The third mounting hole 232 and the fourth mounting hole 233 are aligned in the axial direction AA, and the third mounting hole 232 is spaced apart from the first mounting hole 230 in the circumferential direction CC of the caliper body 201, and the fourth mounting hole 233 is spaced apart from the second mounting hole 231 in the circumferential direction CC of the caliper body 201, and the third mounting hole 232 and the fourth mounting hole 233 are respectively arranged on opposite sides of the opening 206 of the caliper body in the axial direction.

[0071] In some exemplary embodiments, as shown in Figures 2 and 3, the opening 206 of the caliper body 201 can be formed to include a first elongated side portion 261 and a second elongated side portion 262 that are opposite each other in the axial direction AA. The first mounting hole 230 and the third mounting hole 232 are disposed adjacent to the first elongated side portion 261, and the second mounting hole 231 and the fourth mounting hole 233 are disposed adjacent to the second elongated side portion 262. As shown in Figure 5, each of the first elongated shaft 101 and the second elongated shaft 103 includes a first end 113 and a second end 115 that are opposite each other. The first end 113 is formed as a tapered tip. An annular recess can be disposed near the second end 115, and an elastic connector 116 is mounted in the annular recess. In some examples, the elastic connector can be formed as an elastic sleeve. Optionally, the elastic sleeve can be made of materials such as polyurethane, butyl rubber, neoprene, or silicone rubber.

[0072] In some exemplary embodiments, first mounting hole 230 is fixedly connected to elastic connector 116 mounted on first elongated shaft 101 by an interference fit, and first end 113 of first elongated shaft 101 is inserted through second mounting hole 231. Third mounting hole 232 can be fixedly connected to elastic connector mounted on second elongated shaft 103 by an interference fit, and the first end of second elongated shaft 103 is inserted through fourth mounting hole 233.

[0073] As shown in FIG. 5 to FIG. 9 , the first elongated shaft 101 may include a first intermediate connecting portion 114 located between the first end portion 113 and the second end portion 115 . The first intermediate connecting portion 114 may be configured to connect to the first mounting arm portion 221 of the elastic return device.

[0074] A first notch 310 is provided on the radially outer side of the first support plate 31 of the first friction pad assembly, and a second notch 311 is provided on the radially outer side of the second support plate 33 of the second friction pad assembly. The first mounting hole 230, the first notch 310, the second notch 311, and the second mounting hole 231 are arranged in a row in the axial direction AA, and the first elongated shaft 101 is arranged to extend through the first notch 310, the second notch 311, and the second mounting hole 231.

[0075] The diameter of the first intermediate connecting portion 114 may be set to be smaller than the diameter of the portion of the first elongated shaft 101 passing through the first notch portion 310 , and smaller than the diameter of the portion of the first elongated shaft 101 passing through the second notch portion 311 .

[0076] The second elongated shaft 103 may include a second intermediate connection portion 118 between the first end portion 113 and the second end portion 115 thereof, the second intermediate connection portion 118 being configured to connect to the second mounting arm portion 223 of the elastic return device.

[0077] As shown in FIG3 , a third notch 314 may be provided on the radially outer side of the first support plate 31 of the first friction pad assembly, and a fourth notch 316 may be provided on the radially outer side of the second support plate 33 of the second friction pad assembly. The third mounting hole 232, the third notch 314, the fourth notch 316, and the fourth mounting hole 233 are arranged in a row in the axial direction AA, and the second elongated shaft 103 is arranged to extend through the third notch 314, the fourth notch 316, and the fourth mounting hole 233.

[0078] The diameter of the second intermediate connecting portion 118 may be set to be smaller than the diameter of the portion of the second elongated shaft 103 passing through the third notch portion 314 and smaller than the diameter of the portion of the second elongated shaft 103 passing through the fourth notch portion 316 .

[0079] In some examples, the axial length of the first intermediate connection portion 114 may be set to be the same as the axial dimension of the first mounting arm portion 221 . The axial length of the second intermediate connection portion 118 may be set to be the same as the axial dimension of the second mounting arm portion 223 .

[0080] Optionally, the length of each of the first elongated axis 101 and the second elongated axis 103 can be set in the range between 90 mm and 120 mm, and the spacing between the first elongated axis 101 and the second elongated axis 103 in the circumferential direction can be set in the range between 60 mm and 120 mm.

[0081] In some examples, the first elongated shaft and the second elongated shaft can be configured to be the same or different. It should be understood that the size and arrangement of the first elongated shaft 101 and the second elongated shaft 103 are not limited to the above exemplary description, but can be set according to the configuration of the elastic return device and specific installation requirements.

[0082] In some exemplary embodiments, as shown in Figure 7, the first mounting arm 221 of the mounting portion 22 can be provided with a first winding portion 60 fixedly connected to the first intermediate connecting portion 114 of the first elongated shaft 101, and the first winding portion 60 is wound around at least a portion of the first intermediate connecting portion 114 and is in contact with at least a portion of the outer circumferential surface of the first intermediate connecting portion 114.

[0083] The second mounting arm portion 223 of the mounting portion 22 may be provided with a second winding portion 62 fixedly connected to the second intermediate connection portion 118 of the second elongated shaft 103, and the second winding portion 62 is wound around at least a portion of the second intermediate connection portion 118 and is in contact with at least a portion of the outer circumferential surface of the second intermediate connection portion 118.

[0084] In some other exemplary embodiments, as shown in Figures 8 to 10, the first mounting arm 221 of the mounting portion 22 can be provided with a first clamping portion fixedly connected to the first intermediate connecting portion 114 of the first elongated shaft 101, and the first clamping portion includes: a first protrusion 251 extending toward the first central portion 222 of the mounting portion 22; a first clamping strip portion 277 connected to the first protrusion 251 and angled relative to the first protrusion; and a first concave accommodating portion 276 connected to the first clamping strip portion 277, the first intermediate connecting portion 114 of the first elongated shaft 101 is at least partially received in the space defined by the first concave accommodating portion 276, the first clamping strip portion 277 and the first protrusion 251, and the first protrusion 251 and the first mounting arm 221 are formed as an integral piece.

[0085] The second mounting arm 223 of the mounting portion 22 can be provided with a second snap-fit ​​portion fixedly connected to the second intermediate connection portion 118 of the second elongated shaft 103. The second snap-fit ​​portion can include a second tab extending toward the first central portion 222 of the mounting portion 22; a second snap-fit ​​strip connected to and angled relative to the second tab; and a second concave receiving portion connected to the second snap-fit ​​strip. The second intermediate connection portion 118 of the second elongated shaft 103 is at least partially received in the space defined by the second concave receiving portion, the second snap-fit ​​strip, and the second tab. The second tab and the second mounting arm 223 are formed as a single piece.

[0086] In some exemplary embodiments, the second elongated axis 103 can be arranged to be mirrored with the first elongated axis 101 with respect to the first plane of symmetry, the first mounting hole 230 is arranged to be mirrored with the third mounting hole 232 with respect to the first plane of symmetry, and the second mounting hole 231 is arranged to be mirrored with the fourth mounting hole 233 with respect to the first plane of symmetry, wherein the first plane of symmetry is defined as an axial center axis EE (see Figure 8) passing through the elastic return device 200 and being perpendicular to the tangential center axis FF of the elastic return device.

[0087] In some exemplary embodiments, as shown in Figure 10, each of the first mounting arm portion 221 and the second mounting arm portion 223 can be formed to have a corrugated shape in a cross-section perpendicular to the axial direction AA, and can have a plurality of strip portions, and adjacent two of the plurality of strip portions are formed to have a U-shape or a V-shape in a cross-section perpendicular to the axial direction.

[0088] 10 , the first mounting arm 221 may be arranged to be mirrored with the second mounting arm 223 about a first symmetry plane defined as passing through the axial center axis EE of the elastic return device 200 and perpendicular to the tangential center axis FF of the elastic return device.

[0089] The plurality of strip portions of each of the first mounting arm portion 221 and the second mounting arm portion 223 may include (eg, sequentially include): a first strip portion 271 , a second strip portion 273 , a third strip portion 275 and a snap-on strip portion 277 . The first band portion 271 extends from the first central portion 222 of the mounting portion 22 in a radially inward direction, a first rounded portion 272 is provided between the first band portion 271 and the second band portion 273, a second rounded portion 274 is provided between the second band portion 273 and the third band portion 275, a first concave accommodating portion 276 is provided between the third band portion 275 and the snap-on band portion 277, the first rounded portion 272 and the first concave accommodating portion 276 being formed as a trough portion of a corresponding one of the first mounting arm portion 221 and the second mounting arm portion 223 in a cross section perpendicular to the axial direction, the second rounded portion 274 being formed as a peak portion of a corresponding one of the first mounting arm portion 221 and the second mounting arm portion 223 in a cross section perpendicular to the axial direction, the first concave accommodating portion 276 being at least partially in contact with a corresponding one of the first elongated axis 101 and the second elongated axis 103.

[0090] It should be understood that the shapes, sizes and arrangements of the first mounting arm 221 and the second mounting arm 223 and the corresponding strip portions are not limited to the above exemplary descriptions, but may be configured according to specific requirements of the elastic return device.

[0091] In some exemplary embodiments, the first support plate 31 may include a first edge portion (not shown) disposed at a central portion of a radially outer portion of the first support plate in the circumferential direction CC of the caliper body 201. The first biasing arm 241 of the elastic return device 200 is configured to abut against the first edge portion to exert an elastic force on the first edge portion, thereby biasing the first support plate 31 and the first friction material 32 away from the brake disc 10 in the axial direction AA. In some examples, the first biasing arm 241 of the elastic return device 200 may be configured to abut against the first edge portion of the first friction pad assembly to exert an elastic biasing force on the first edge portion in at least the axial direction AA and the radial direction RR, thereby biasing the first friction pad assembly away from the brake disc 10 in the axial direction AA and reducing vibration of the first friction pad assembly (the first support plate 31 and the first friction material 32) in the radial direction RR.

[0092] As shown in Figures 2, 6, and 7, the second support plate 33 may include a second edge portion 321, which is provided at a central portion of a radially outer portion of the second support plate 33 in the circumferential direction of the caliper body. The second biasing arm 243 of the elastic return device 200 is configured to abut against the second edge portion 321 to exert an elastic force on the second edge portion, thereby biasing the second support plate 33 and the second friction material member 34 in the axial direction AA away from the brake disc 10. In some examples, the second biasing arm 243 of the elastic return device 200 may be configured to exert an elastic biasing force on the second edge portion in at least the axial direction AA and the radial direction RR, thereby biasing the second friction pad assembly away from the brake disc 10 in the axial direction AA and reducing vibration of the second friction pad assembly (the second support plate 33 and the second friction material member 34) in the radial direction RR.

[0093] In some exemplary embodiments, each of the first edge portion (not shown) of the first support plate 31 and the second edge portion 321 of the second support plate 33 may be formed to have an arc shape in a cross section perpendicular to the axial direction AA.

[0094] In some exemplary embodiments, each of the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 can be formed into a band shape, and each of the first biasing arm portion 241 and the second biasing arm portion 243 (as shown in FIG. 11 ) can include: a first arc portion 24A, a band-shaped extension portion 24B, a second arc portion 24C, and a biasing inclined portion 24D, wherein the first arc portion 24A is connected to the second central portion 242 and extends from the second central portion 242 toward the radial inner side. direction, the strip-shaped extension portion 24B is connected to the first arc-shaped portion 24A and extends in a plane substantially perpendicular to the axial direction AA, the offset inclined portion 24D is at an angle relative to the strip-shaped extension portion 24B in a cross section passing through the center point O of the elastic return device 200 and perpendicular to the tangential center axis FF (refer to FIG8 ) of the elastic return device 200, and the second arc-shaped portion 24C is arranged between the strip-shaped extension portion 24B and the offset inclined portion 24D and connects the strip-shaped extension 24B to the offset inclined portion 24D.

[0095] It should be understood that, as shown in FIG8 , the tangential center axis FF of the elastic return device 200 is the center axis that bisects the elastic return device 200 along the tangential direction BB in a top view of the elastic return device 200. The axial center axis EE of the elastic return device 200 is the center axis that bisects the elastic return device 200 along the axial direction AA in a top view of the elastic return device 200.

[0096] In some examples, the radius of curvature of the first curved portion 24A during braking is set in a range of 9 mm to 11 mm, and the radius of curvature of the second curved portion 24C can be set in a range of 1 mm to 3 mm. Alternatively, the radius of curvature of the second curved portion 24C can be set to 2 mm, and the radius of curvature of the second curved portion 24C during braking can always be 2 mm.

[0097] In some examples, each of the first biasing arm 241 and the second biasing arm 243 of the elastic return device 200 can be designed so that a first angle formed by the band-like extension 24B and the second central portion 242 in a cross section passing through the center point O of the elastic return device 200 and perpendicular to the tangential central axis FF of the elastic return device 200 is 104 degrees or 106 degrees. Alternatively, during braking, the first biasing arm 241 and the second biasing arm 243 of the elastic return device 200 undergo elastic deformation, and the first angle formed by the band-like extension 24B and the second central portion 242 in a cross section passing through the center point O of the elastic return device 200 and perpendicular to the tangential central axis FF of the elastic return device 200 can vary within a range between 83 degrees and 106 degrees.

[0098] In some examples, each of the first biasing arm 241 and the second biasing arm 243 of the elastic return device 200 can be designed such that a second angle formed by the biasing inclined portion 24D and the band-shaped extension portion 24B in a cross section passing through the center point O of the elastic return device 200 and perpendicular to the tangential central axis FF of the elastic return device 200 can be 109 degrees or 118 degrees. Alternatively, during braking, the first biasing arm 241 and the second biasing arm 243 of the elastic return device 200 undergo elastic deformation, and the second angle formed by the biasing inclined portion 24D and the band-shaped extension portion 24B in a cross section passing through the center point O of the elastic return device 200 and perpendicular to the tangential central axis FF of the elastic return device 200 can vary within a range between 112 degrees and 118 degrees.

[0099] It should be understood that the size and arrangement of the first biasing arm 241 and the second biasing arm 243 are not limited to the exemplary embodiment described herein, but may be adjusted according to actual conditions.

[0100] In some exemplary embodiments, a first aperture 28 may be provided at the second arcuate portion 24C of each of the first biasing arm 241 and the second biasing arm 243. The first aperture 28 includes a first radially inner edge portion 281 and a second radially outer edge portion 283 opposing each other. The first radially inner edge portion 281 is disposed adjacent to the biasing inclined portion 24D. Each of the first biasing arm 241 and the second biasing arm 243 includes a first overhang portion 290 extending from the second radially outer edge portion 283 of the first aperture in a manner parallel to the band-shaped extension portion 24B. The first overhang portion 290 is configured to limit the radially inward movement of each of the first biasing arm 241 and the second biasing arm 243. The first overhang portion 290 may be formed as an anti-fall-off structure. Specifically, when the elastic return device 200 is manually installed between the opposing first and second friction pad assemblies, each of the first biasing arm 241 and the second biasing arm 243 of the elastic return device 200 is pressed by the installer and moves generally radially inward. The provision of the first overhanging portion 290 limits the radially inward movement of the first and second biasing arms 241, 243, thereby effectively preventing the biasing inclined portions 24D of the biasing arms from disengaging from the support plates of the corresponding friction pad assemblies.

[0101] In some exemplary embodiments, the biasing inclined portion 24D is configured to abut the corresponding edge portion of the corresponding support plate in a point-contact manner. For example, when the second support plate 33 is configured to have an arcuate second edge portion 321, the biasing inclined portion 24D of the second biasing arm 243 abuts the second edge portion 321 in a point-contact manner. Alternatively, during the braking and release of the disc brake, the biasing inclined portion 24D of the second biasing arm 243 abuts the second edge portion 321 of the second support plate 33 in a point-contact manner, and accordingly, the biasing inclined portion 24D of the first biasing arm 241 abuts the first edge portion of the first support plate 31 in a point-contact manner.

[0102] In some other exemplary embodiments, a second aperture 40 is provided at a portion of the band-shaped extension 24B of each of the first biasing arm 241 and the second biasing arm 243 connected to the second arcuate portion 24C. The second aperture 40 includes a third radially inner edge portion 401 and a fourth radially outer edge portion 403 opposing each other. The third radially inner edge portion 401 is arranged adjacent to the biasing inclined portion 24D. Each of the first biasing arm 241 and the second biasing arm 243 includes a second overhang 292 protruding from the third radially inner edge portion 401 of the second aperture 40 in a manner parallel to the biasing inclined portion 24D. The second overhang 292 is configured to limit the radially inward movement of each of the first biasing arm 241 and the second biasing arm 243. The second overhang 292 may be formed as a fall-off prevention structure. Specifically, when the elastic return device 200 is manually installed between the opposing first and second friction pad assemblies, each of the first biasing arm 241 and the second biasing arm 243 of the elastic return device 200 is pressed by the installer and moves generally radially inward. The provision of the second overhanging portion 292 limits the radially inward movement of the first and second biasing arms 241, 243, thereby effectively preventing the biasing inclined portions 24D of the biasing arms from disengaging from the support plates of the corresponding friction pad assemblies.

[0103] In some exemplary embodiments, the second biasing arm 243 can be configured to be a mirror image of the first biasing arm 241 about a second symmetry plane, and the second symmetry plane is defined as passing through the tangential center axis FF of the elastic return device 200 and perpendicular to the axial center axis EE of the elastic return device 200.

[0104] In some exemplary embodiments, the first central portion 222 of the mounting portion 22 is connected to the second central portion 242 of the biasing portion 24 by a rivet 400 (as shown in FIG12 ). The first central portion 222 and the second central portion 242 may be provided with rivet holes, which may be formed to have the following shapes: circular, plum blossom-shaped, or square with rounded corners. The rivet 400 is connected to the rivet holes provided in the first central portion 222 and the second central portion 242 in an interference fit manner, thereby improving the structural stability of the elastic return device. In addition, the cost of the riveted connection is low, and the connection between the mounting portion 22 and the biasing portion 24 of the elastic return device 200 can be completed more quickly and efficiently, and the elastic return device 200 has good anti-seismic and anti-impact performance.

[0105] Although the present disclosure has been described with reference to exemplary embodiments, it should be understood that the present disclosure is not limited to the specific embodiments described and shown in detail herein. Those skilled in the art may make various changes to the exemplary embodiments without departing from the scope defined by the claims of the present disclosure.

[0106] The features mentioned and / or illustrated in the above description of the exemplary embodiments of the present disclosure may be incorporated into one or more other embodiments in the same or similar manner, for example, by combining with or replacing the features of other embodiments. The technical solutions obtained by such combination or replacement shall also be deemed to be included within the scope of protection of the present disclosure. Industrial Applicability

[0107] urging the brake caliper to move the brake disc in a direction of rotation relative to the caliper body.

[0108] The present invention enables the elastic return device to be mounted on a mounting shaft (e.g., a pin) on the caliper body in a relatively simple and compact manner, thereby achieving a secure and durable connection between the elastic return device and the caliper body. In addition, since a central bridge portion is not required on the caliper body, the number of components of the brake caliper is reduced, and the complexity of the brake caliper body is reduced, thereby simplifying the manufacturing process, reducing manufacturing costs, and making the brake caliper body lighter. When replacing a worn friction pad assembly in the brake caliper of the present invention, the friction pad assembly can be quickly removed and replaced by removing the mounting shaft that straddles the friction pad assembly, thereby improving the efficiency of the replacement operation.

[0109] Furthermore, the disc brake provided by the present disclosure is reproducible and can be manufactured or used industrially and can be used in a variety of industrial applications. For example, the disc brake provided by the present disclosure can be used in a variety of vehicle braking applications.

Claims

1. A disc brake, the disc brake (1) comprising a brake disc (10), a brake caliper (20) and an elastic return device (200), the brake disc (10) being configured to rotate about a rotation axis (XX), the brake disc (10) defining an axial direction (AA) parallel to the rotation axis (XX), a radial direction (RR) perpendicular to the rotation axis (XX), and a tangential direction (BB) perpendicular to both the axial direction (AA) and the radial direction (RR), The brake caliper (20) comprises a caliper body (201) and a friction pad assembly accommodated in the caliper body (201); the elastic return device (200) is arranged to straddle the brake disc (10); and when the braking action of the disc brake (1) stops, the elastic return device (200) applies an elastic action to the friction pad assembly so as to bias the friction pad assembly away from the brake disc (10); It is characterized in that The brake caliper (20) has an elongated shaft mounted at the radial outer side (215) of the caliper body (201), the elongated shaft extending substantially along the axial direction (AA) and arranged on the outer side of the friction pad assembly in the radial direction (RR), the elastic return device (200) comprising a mounting portion (22) and a biasing action portion (24) connected to the mounting portion, the mounting portion (22) being detachably connected to the elongated shaft, the biasing action portion (24) being configured to abut against the friction pad assembly to apply an elastic biasing force to the friction pad assembly at least in the axial direction (AA) and the radial direction (RR).

2. The disc brake according to claim 1, characterized in that The elongated shaft comprises a first elongated shaft (101) and a second elongated shaft (103), the first elongated shaft (101) and the second elongated shaft (103) being arranged parallel to each other and spaced apart from each other in a circumferential direction (CC) of the caliper body (201), The mounting portion (22) of the elastic return device (200) comprises a first mounting arm portion (221) connected to the first elongated shaft (101), a second mounting arm portion (223) connected to the second elongated shaft (103), and a first central portion (222) located between the first mounting arm portion (221) and the second mounting arm portion (223); The friction pad assembly comprises a first friction pad assembly and a second friction pad assembly, the first friction pad assembly comprises a first support plate (31) and a first friction material member (32) mounted on the first support plate (31), the second friction pad assembly comprises a second support plate (33) and a second friction material member (34) mounted on the second support plate, the first friction pad assembly and the second friction pad assembly are arranged to be opposite to each other in the axial direction (AA), the biasing action portion (24) of the elastic return device (200) comprises a first biasing arm portion (241) configured to abut against the first support plate (31), a second biasing arm portion (243) configured to abut against the second support plate (33), and a second central portion (242) located between the first biasing arm portion and the second biasing arm portion, The first central portion (222) of the mounting portion (22) is connected to the second central portion (242) of the biasing portion (24).

3. The disc brake according to claim 2, characterized in that The caliper body (201) is formed with an opening (206) on the radially outer portion (215), so that at least a portion of the first friction pad assembly and the second friction pad assembly are exposed. The caliper body (201) is provided with a first mounting hole (230) and a second mounting hole (231) for receiving the first elongated shaft (101), and a third mounting hole (232) and a fourth mounting hole (233) for receiving the second elongated shaft (103). The first mounting hole (230) and the second mounting hole (231) are aligned in the axial direction (AA) and are respectively arranged on opposite sides of the opening (206) of the caliper body (201) in the axial direction. The third mounting hole (232) and the fourth mounting hole (233) are aligned in the axial direction (AA), and the third mounting hole (232) is spaced apart from the first mounting hole (230) in the circumferential direction (CC) of the caliper body (201), and the fourth mounting hole (233) is spaced apart from the second mounting hole (231) in the circumferential direction (CC) of the caliper body (201), and the third mounting hole (232) and the fourth mounting hole (233) are respectively arranged on opposite sides of the opening of the caliper body in the axial direction.

4. The disc brake according to claim 3, characterized in that The opening (206) is formed to include a first elongated side portion (261) and a second elongated side portion (262) opposite to each other in the axial direction (AA), the first mounting hole (230) and the third mounting hole (232) are arranged adjacent to the first elongated side portion (261), the second mounting hole (231) and the fourth mounting hole (233) are arranged adjacent to the second elongated side portion (262), and Each of the first elongated shaft (101) and the second elongated shaft (103) includes a first end (113) and a second end (115) opposite to each other, the first end (113) being formed as a tapered tip, an annular recess being provided near the second end (115), and an elastic connector (116) being installed in the annular recess.

5. The disc brake according to claim 4, characterized in that The first mounting hole (230) is fixedly connected to an elastic connecting member (116) mounted on the first elongated shaft (101) in an interference fit manner, and the first end portion (113) of the first elongated shaft (101) is inserted through the second mounting hole (231), and The third mounting hole (232) is fixedly connected to an elastic connecting piece mounted on the second elongated shaft (103) in an interference fit manner, and the first end of the second elongated shaft (103) is inserted through the fourth mounting hole (233).

6. The disc brake according to claim 5, characterized in that The first elongated shaft (101) comprises a first intermediate connecting portion (114) located between the first end portion (113) and the second end portion (115), wherein the first intermediate connecting portion (114) is configured to be connected to the first mounting arm portion (221) of the elastic return device. A first notch portion (310) is provided at a radially outer portion of the first support plate (31) of the first friction pad assembly, and a second notch portion (311) is provided at a radially outer portion of the second support plate (33) of the second friction pad assembly, the first mounting hole (230), the first notch portion (310), the second notch portion (311) and the second mounting hole (231) are arranged in a row in the axial direction (AA), and the first elongated shaft (101) is arranged to extend through the first notch portion (310), the second notch portion (311) and the second mounting hole (231), The diameter of the first intermediate connecting portion (114) is set to be smaller than the diameter of the portion of the first elongated shaft (101) passing through the first notch portion (310), and smaller than the diameter of the portion of the first elongated shaft (101) passing through the second notch portion (311).

7. The disc brake according to claim 6, characterized in that The second elongated shaft (103) comprises a second intermediate connecting portion (118) located between the first end portion (113) and the second end portion (115) thereof, wherein the second intermediate connecting portion is configured to be connected to the second mounting arm portion (223) of the elastic return device. A third notch portion (314) is provided at a radially outer portion of the first support plate (31) of the first friction pad assembly, a fourth notch portion (316) is provided at a radially outer portion of the second support plate (33) of the second friction pad assembly, the third mounting hole (232), the third notch portion (314), the fourth notch portion (316) and the fourth mounting hole (233) are arranged in a row in the axial direction (AA), and the second elongated shaft (103) is arranged to extend through the third notch portion (314), the fourth notch portion (316) and the fourth mounting hole (233), The diameter of the second intermediate connecting portion (118) is set to be smaller than the diameter of the portion of the second elongated shaft (103) passing through the third notch portion (314), and smaller than the diameter of the portion of the second elongated shaft (103) passing through the fourth notch portion (316).

8. The disc brake according to claim 7, characterized in that The first mounting arm portion (221) of the mounting portion (22) is provided with a first winding portion (60) fixedly connected to the first intermediate connecting portion (114) of the first elongated shaft (101), the first winding portion (60) being wound around at least a portion of the first intermediate connecting portion (114) and being in contact with at least a portion of the outer circumferential surface of the first intermediate connecting portion (114); or The first mounting arm portion (221) of the mounting portion (22) is provided with a first clamping portion fixedly connected to the first intermediate connecting portion (114) of the first elongated axis (101), the first clamping portion comprising: a first protrusion (251) extending toward the first central portion (222) of the mounting portion (22); a first clamping strip portion (277) connected to the first protrusion and angled relative to the first protrusion; and a first concave accommodating portion (276) connected to the first clamping strip portion (277), the first intermediate connecting portion (114) of the first elongated axis (101) being at least partially received in a space defined by the first concave accommodating portion, the first clamping strip portion (277) and the first protrusion (251), the first protrusion (251) and the first mounting arm portion (221) being formed as an integral piece.

9. The disc brake according to claim 8, characterized in that The second mounting arm portion (223) of the mounting portion (22) is provided with a second winding portion (62) fixedly connected to the second intermediate connecting portion (118) of the second elongated shaft (103), the second winding portion being wound around at least a portion of the second intermediate connecting portion and being in contact with at least a portion of the outer circumferential surface of the second intermediate connecting portion (118); or The second mounting arm portion (223) of the mounting portion (22) is provided with a second clip portion fixedly connected to the second intermediate connecting portion (118) of the second elongated axis (103), the second clip portion comprising a second protrusion extending toward the first central portion (222) of the mounting portion (22); a second clipping band portion connected to the second protrusion and angled relative to the second protrusion; and a second concave accommodating portion connected to the second clipping band portion, the second intermediate connecting portion (118) of the second elongated axis (103) being at least partially received in a space defined by the second concave accommodating portion, the second clipping band portion and the second protrusion, the second protrusion and the second mounting arm portion (223) being formed as an integral piece.

10. The disc brake according to any one of claims 3 to 9, characterized in that The second elongated axis (103) is arranged to be a mirror image of the first elongated axis (101) with respect to a first symmetry plane, the first mounting hole (230) is arranged to be a mirror image of the third mounting hole (232) with respect to the first symmetry plane, the second mounting hole (231) is arranged to be a mirror image of the fourth mounting hole (233) with respect to the first symmetry plane, and the first symmetry plane is defined as passing through the axial center axis (EE) of the elastic return device (200) and being perpendicular to the tangential center axis (FF) of the elastic return device.

11. The disc brake according to any one of claims 2 to 9, characterized in that Each of the first mounting arm portion (221) and the second mounting arm portion (223) is formed to have a corrugated shape in a cross section perpendicular to the axial direction, and has a plurality of strip-shaped portions, and two adjacent strip-shaped portions among the plurality of strip-shaped portions are formed to have a U-shape or a V-shape in a cross section perpendicular to the axial direction.

12. The disc brake according to claim 11, characterized in that The plurality of strip-shaped portions of each of the first mounting arm portion (221) and the second mounting arm portion (223) include: a first strip-shaped portion (271), a second strip-shaped portion (273), a third strip-shaped portion (275) and a snap-on strip-shaped portion (277), wherein the first strip-shaped portion (271) extends from the first central portion (222) of the mounting portion (22) in a radially inward direction, a first rounded corner portion (272) is provided between the first strip-shaped portion (271) and the second strip-shaped portion (273), a second rounded corner portion (274) is provided between the second strip-shaped portion (273) and the third strip-shaped portion (275), and a second rounded corner portion (275) is provided between the third strip-shaped portion (275) and the third strip-shaped portion (277). A first concave accommodating portion (276) is arranged between the snap-fitting band portion (277), the first rounded portion (272) and the first concave accommodating portion (276) are formed as a trough portion of a corresponding one of the first mounting arm portion (221) and the second mounting arm portion (223) in a cross section perpendicular to the axial direction, the second rounded portion (274) is formed as a peak portion of a corresponding one of the first mounting arm portion (221) and the second mounting arm portion (223) in a cross section perpendicular to the axial direction, and the first concave accommodating portion (276) is at least partially in contact with a corresponding one of the first elongated axis (101) and the second elongated axis (103).

13. The disc brake according to claim 12, characterized in that The first mounting arm portion (221) is arranged to be mirrored with the second mounting arm portion (223) about a first symmetry plane, wherein the first symmetry plane is defined as passing through the axial center axis (EE) of the elastic return device (200) and being perpendicular to the tangential center axis (FF) of the elastic return device.

14. The disc brake according to any one of claims 2 to 9, characterized in that The first support plate (31) includes a first edge portion, the first edge portion is arranged at a central portion of a radially outer portion of the first support plate in the circumferential direction (CC) of the caliper body (201), and the first biasing arm portion (241) of the elastic return device (200) is configured to abut against the first edge portion to exert an elastic effect on the first edge portion, thereby biasing the first support plate (31) and the first friction material member (32) to be away from the brake disc (10) in the axial direction (AA); and The second support plate (33) includes a second edge portion (321), and the second edge portion (321) is arranged at the central portion of the radial outer portion of the second support plate (33) in the circumferential direction of the caliper body. The second biasing arm portion (243) of the elastic return device (200) is configured to abut against the second edge portion (321) to exert an elastic effect on the second edge portion, thereby biasing the second support plate (33) and the second friction material member (34) away from the brake disc (10) in the axial direction (AA).

15. The disc brake according to claim 14, characterized in that Each of the first biasing arm portion (241) and the second biasing arm portion (243) of the elastic return device (200) is formed in a band shape, and each of the first biasing arm portion (241) and the second biasing arm portion (243) includes: a first arc portion (24A), a band-shaped extension portion (24B), a second arc portion (24C) and a biasing inclined portion (24D), the first arc portion (24A) is connected to the second central portion (242) and extends from the second central portion (242) in a direction toward the radial inside, and the band-shaped extension portion (24C) is connected to the second central portion (242). B) is connected to the first arc portion (24A) and extends in a plane substantially perpendicular to the axial direction (AA), the offset inclined portion (24D) is at an angle relative to the strip-shaped extension portion (24B) in a cross section passing through the center point (O) of the elastic return device (200) and perpendicular to the tangential center axis (FF) of the elastic return device (200), and the second arc portion (24C) is arranged between the strip-shaped extension portion (24B) and the offset inclined portion (24D) and connects the strip-shaped extension portion (24B) with the offset inclined portion (24D).

16. The disc brake according to claim 15, characterized in that A first orifice (28) is provided at the second arc portion (24C) of each of the first biasing arm portion (241) and the second biasing arm portion (243), the first orifice comprising a first radially inner edge portion (281) and a second radially outer edge portion (283) opposite to each other, the first radially inner edge portion being arranged to be adjacent to the biasing inclined portion (24D), and each of the first biasing arm portion (241) and the second biasing arm portion (243) comprising a first cantilever portion (290) extending from the second radially outer edge portion (283) of the first orifice in a manner parallel to the band-shaped extension portion (24B), the first cantilever portion (290) being configured to limit the radially inward movement of each of the first biasing arm portion (241) and the second biasing arm portion (243).

17. The disc brake according to claim 15, characterized in that Each of the first edge portion of the first support plate (31) and the second edge portion (321) of the second support plate (33) is formed to have an arc shape in a cross section perpendicular to the axial direction (AA).

18. The disc brake according to claim 17, characterized in that The offset inclined portion (24D) is configured to abut against an edge portion of a corresponding one of the first support plate (31) and the second support plate (33) in a point contact manner.

19. The disc brake according to claim 15, characterized in that A second orifice (40) is provided at a portion of the strip-shaped extension portion (24B) of each of the first biasing arm portion (241) and the second biasing arm portion (243) connected to the second arc-shaped portion (24C), the second orifice (40) comprising a third radially inner edge portion (401) and a fourth radially outer edge portion (403) opposite to each other, the third radially inner edge portion (401) being arranged to be adjacent to the biasing inclined portion (24D), each of the first biasing arm portion (241) and the second biasing arm portion (243) comprising a second overhang portion (292) protruding from the third radially inner edge portion (401) of the second orifice (40) in a manner parallel to the biasing inclined portion (24D), the second overhang portion (292) being configured to limit the radial inward movement of each of the first biasing arm portion (241) and the second biasing arm portion (243).

20. The disc brake according to claim 14, characterized in that The second biasing arm portion (243) is arranged to be a mirror image of the first biasing arm portion (241) with respect to a second symmetry plane, and the second symmetry plane is defined as passing through the tangential center axis (FF) of the elastic return device (200) and being perpendicular to the axial center axis (EE) of the elastic return device (200).

21. The disc brake according to any one of claims 2 to 9, characterized in that The first central portion (222) of the mounting portion (22) and the second central portion (242) of the biasing portion (24) are connected via a rivet (400).

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