Disc brake

Abstract

The present application relates to a disc brake comprising a brake disc, a brake caliper having a caliper body and a friction pad assembly housed in the caliper body, and a resilient return device arranged to straddle the brake disc, and an elastic return device that exerts an elastic effect on the friction pad assembly to bias the friction pad assembly away from the brake disc when the braking effect of the disc brake is stopped, the brake caliper having an elongated shaft mounted at a radially outer side of the caliper body, the elongated shaft extends substantially along the axial direction and is arranged outside the friction pad assembly in the radial direction, the elastic return device comprises a mounting part and a bias acting part connected with the mounting part, the mounting part is detachably connected with the elongated shaft, and the bias acting part is configured to abut against the friction pad assembly; an elastic biasing force is applied to the friction pad assembly at least in an axial direction and a radial direction.

Description

Technical Field

[0001] The present application relates to a disc brake, and more particularly to a disc brake including an elastic return device which is particularly used to apply an elastic action to a friction lining assembly to bias the friction lining assembly away from a brake disc when the braking action of the disc brake stops. Background Art

[0002] This section provides background information related to the present application, but this information does not necessarily constitute prior art.

[0003] During vehicle braking, the braking force is usually provided by the friction between the friction material of the friction lining assembly and the brake disc. In some disc brakes of related technologies, a return spring is provided. After the brake pedal is released, the friction lining assembly of the brake caliper returns to the initial position due to the biasing action of the return spring. In other words, the return spring biases two opposite friction lining assemblies away from each other after braking ends to ensure that the friction material separates from the brake disc after each braking action is released.

[0004] In some related technical solutions, the return spring occupies a large installation space. For example, the caliper body of the brake caliper includes a central bridge portion, at least a part of the return spring is fixedly connected to the central bridge portion, the central bridge portion is arranged to straddle the brake disc and the friction lining assembly, and the central bridge portion is integrally formed with the caliper body in a non-detachable manner. For example, the central bridge portion is integrally formed on the caliper body through a casting process, and it is difficult to disassemble and assemble the brake caliper, thus making it inconvenient to quickly disassemble, assemble and replace the friction lining assembly located in the caliper body.

[0005] Therefore, there is an urgent need for an elastic return device that is more compact in structure and convenient for installation, as well as a disc brake including such an elastic return device. Summary of the Invention

[0006] This section provides a general overview of the present application, rather than a full disclosure of the entire scope or all features of the present application.

[0007] In view of the problems existing in the above conventional technologies, there is a need to improve the related disc brakes to overcome or alleviate all or at least part of the above technical problems.

[0008] In some exemplary embodiments of the present application, the present application provides a disc brake, which includes a brake disc, a brake caliper, and an elastic return device. The brake disc is configured to rotate about a rotation axis, and the brake disc defines an axial direction parallel to the rotation axis, a radial direction perpendicular to the rotation axis, and a tangential direction perpendicular to both the axial direction and the radial direction. The brake caliper has a caliper body and a friction pad assembly received in the caliper body. The elastic return device is arranged to straddle the brake disc, and the elastic return device applies an elastic action to the friction pad assembly when the braking action of the disc brake stops, so as to bias the friction pad assembly away from the brake disc.

[0009] The brake caliper may have an elongated shaft mounted at a radially outer portion of the caliper body. The elongated shaft extends substantially along the axial direction and is arranged outside the friction pad assembly in the radial direction. The elastic return device may include a mounting portion and a biasing portion connected to the mounting portion. The mounting portion is detachably connected to the elongated shaft, and the biasing portion may be 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 and the radial direction.

[0010] According to the elastic return device provided by the present application, the mounting portion of the elastic return device is detachably connected to the corresponding elongated shaft. Compared with the prior art solution of mounting the elastic return device on the central bridge portion of the caliper body, the present application can mount the elastic return device on the mounting shaft (such as a pin shaft) of the caliper body in a relatively simple and compact manner, thereby realizing 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 portion on the caliper body, the number of components of the brake caliper is reduced, the complexity of the caliper body of the brake caliper is reduced, and thus the manufacturing process is simplified. Further, since the manufacturing materials are reduced, the manufacturing cost is reduced, and the caliper body of the brake caliper is made lighter. When replacing the worn friction pad assembly in the brake caliper of the present application, by disassembling the mounting shaft straddling the friction pad assembly, the friction pad assembly can be quickly disassembled and replaced, improving the replacement operation efficiency.

[0011] In some exemplary embodiments of the present application, the elongated shaft may include a first elongated shaft and a second elongated shaft. The first elongated shaft and the second elongated shaft may be arranged parallel to each other and spaced apart from each other in the 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.

[0012] In some exemplary embodiments of the present application, the friction pad assembly may include a first friction pad assembly and a second friction pad assembly. The first friction pad assembly has a first support plate and a first friction material member mounted on the first support plate. The second friction pad assembly has 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 to face each other in the axial direction. The biasing portion of the elastic return device may include a first biasing arm portion configured to abut against the first support plate, a second biasing arm portion configured to abut against the second support plate, and a second central portion located between the first biasing arm portion and the second biasing arm portion. The first central portion of the mounting portion is connected to the second central portion of the biasing portion.

[0013] According to the elastic return device provided by the present application, the elastic return device having two mounting arm portions and two biasing arm portions is formed in a substantially cross shape. The two mounting arm portions are used to simply and compactly fix the elastic return device to the long shaft mounted on the caliper body. The two biasing arm portions are arranged on opposite sides of the second central portion of the biasing portion, and can apply an elastic force to the friction pad assembly in a relatively stable manner to bias the friction pad assembly to move away from the brake disc.

[0014] In some exemplary embodiments of the present application, the caliper body is formed with an opening in the radially outer portion, so that at least a part of the first friction pad assembly and the second friction pad assembly is exposed. The caliper body may be provided with a first mounting hole and a second mounting hole for receiving a first long shaft, and a third mounting hole and a fourth mounting hole for receiving a second long shaft. The first mounting hole and the second mounting hole are aligned in the axial direction and are respectively arranged on opposite sides of the opening of the caliper body in the axial direction.

[0015] In some exemplary embodiments of the present application, the third mounting hole and the fourth mounting hole may be aligned in the axial direction, and the third mounting hole is spaced from the first mounting hole in the circumferential direction of the caliper body, and the fourth mounting hole is spaced from the second mounting hole in the circumferential direction of the caliper body. The third mounting hole and the fourth mounting hole may be respectively arranged on opposite sides of the opening of the caliper body in the axial direction.

[0016] In some exemplary embodiments of the present application, the opening of the caliper body may be formed to include a first long side portion and a second long side portion facing each other in the axial direction. The first mounting hole and the third mounting hole may be arranged adjacent to the first long side portion, and the second mounting hole and the fourth mounting hole are arranged adjacent to the second long side portion. Each of the first long shaft and the second long shaft may include a first end portion and a second end portion opposite to each other. The first end portion is formed as a tapered tip portion, and an annular recess is provided near the second end portion, and an elastic connecting member is mounted in the annular recess.

[0017] In some exemplary embodiments of the present application, the first mounting hole is fixedly connected to the elastic connecting member mounted on the first long shaft in an interference fit manner, and the first end portion of the first long 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 long shaft in an interference fit manner, and the first end portion of the second long shaft is inserted through the fourth mounting hole.

[0018] According to the exemplary embodiments of the present application, by making the elastic connecting members provided at one end portion of each long shaft in interference fit with the corresponding mounting holes, the long shafts can be firmly mounted on the caliper body.

[0019] In some exemplary embodiments of the present application, the first long 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 arranged to be connected to the first mounting arm portion of the elastic return device.

[0020] A first notch portion is provided at the radially outer portion of the first support plate of the first friction pad assembly, a second notch portion is provided at the radially outer portion of the second support plate of the second friction pad assembly, the first mounting hole, the first notch portion, the second notch portion and the second mounting hole are arranged in a row in the axial direction, and the first long shaft is arranged to extend through the first notch portion, the second notch portion and the second mounting hole.

[0021] In some exemplary embodiments of the present application, the diameter of the first intermediate connecting portion may be set to be smaller than the diameter of the portion of the first long shaft passing through the first notch portion, and smaller than the diameter of the portion of the first long shaft passing through the second notch portion.

[0022] In some exemplary embodiments of the present application, the second long shaft may include a second intermediate connecting portion located between its first end portion and the second end portion, and the second intermediate connecting portion is arranged to be connected to the second mounting arm portion of the elastic return device.

[0023] A third notch portion may be provided at the radially outer portion of the first support plate of the first friction pad assembly, a fourth notch portion may be provided at the radially outer portion of the second support plate of the second friction pad assembly, the third mounting hole, the third notch portion, the fourth notch portion and the fourth mounting hole are arranged in a row in the axial direction, and the second long shaft is arranged to extend through the third notch portion, the fourth notch portion and the fourth mounting hole.

[0024] In some exemplary embodiments of the present application, the diameter of the second intermediate connecting portion may be set to be smaller than the diameter of the portion of the second long shaft passing through the third notch portion, and smaller than the diameter of the portion of the second long shaft passing through the fourth notch portion.

[0025] In some exemplary embodiments of the present application, 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. The first winding portion may wind around at least a part of the first intermediate connecting portion and fit with at least a part of the outer circumferential surface of the first intermediate connecting portion; or

[0026] The first mounting arm portion of the mounting portion may be provided with a first clamping portion fixedly connected to the first intermediate connecting portion of the first elongated shaft. The first clamping portion may include: a first tab extending towards the first central portion of the mounting portion; a first clamping strip portion connected to the first tab and angled relative to the first tab; and a concave accommodating portion connected to the first clamping strip portion. The first intermediate connecting portion of the first elongated shaft may be at least partially received in the space defined by the first concave accommodating portion, the first clamping strip portion and the first tab. The first tab and the first mounting arm portion are formed as an integral piece.

[0027] In some exemplary embodiments of the present application, 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. The second winding portion winds around at least a part of the second intermediate connecting portion and fits with at least a part of the outer circumferential surface of the second intermediate connecting portion.

[0028] In some other exemplary embodiments of the present application, the second mounting arm portion of the mounting portion may be provided with a second clamping portion fixedly connected to the second intermediate connecting portion of the second elongated shaft. The second clamping portion may include a second tab extending towards the first central portion of the mounting portion; a second clamping strip portion connected to the second tab and angled relative to the second tab; and a second concave accommodating portion connected to the second clamping strip 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 clamping strip portion and the second tab. The second tab and the second mounting arm portion are formed as an integral piece.

[0029] In some exemplary embodiments of the present application, the second elongated shaft may be arranged to be a mirror image of the first elongated shaft with respect to a first symmetry plane. The first mounting hole is arranged to be a mirror image of the third mounting hole with respect to the first symmetry plane. The second mounting hole is arranged to be a mirror image of the fourth mounting hole with respect to the first symmetry plane. The first symmetry plane is defined as passing through the axial central axis of the elastic return device and perpendicular to the tangential central axis of the elastic return device.

[0030] By arranging the two elongated shafts and four mounting holes of the present application into a substantially symmetric configuration with respect to the first symmetry plane, better structural stability is provided, and it is also convenient for mass production of each component, thus being easy to manufacture and having good cost-effectiveness.

[0031] In some exemplary embodiments of the present application, each of the first mounting arm portion and the second mounting arm portion may be formed in a corrugated shape in a cross-section perpendicular to the axial direction, and may have a plurality of strip portions, and two adjacent strip portions among the plurality of strip portions are formed in a U-shaped or V-shaped shape in a cross-section perpendicular to the axial direction.

[0032] In some exemplary embodiments of the present application, the plurality of strip portions of each of the first mounting arm portion and the second mounting arm portion may include: a first strip portion, a second strip portion, a third strip portion, and a clamping strip portion. The first strip portion extends from the first central portion of the mounting portion along a direction toward the radially inner side. A first rounded portion is provided between the first strip portion and the second strip portion. A second rounded portion is provided between the second strip portion and the third strip portion. A concave accommodating portion is provided between the third strip portion and the clamping strip portion. The first rounded portion and the concave accommodating portion are formed as the trough portions of the 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 portion is formed as the peak portion of the corresponding one of the first mounting arm portion and the second mounting arm portion in a cross-section perpendicular to the axial direction. The concave accommodating portion is at least partially in contact with the corresponding one of the first elongated shaft and the second elongated shaft.

[0033] In some exemplary embodiments of the present application, the first mounting arm portion may be arranged to be mirror-symmetrical with the second mounting arm portion with respect to a first symmetry plane, and the first symmetry plane is defined as passing through the axial central axis of the elastic return device and perpendicular to the tangential central axis of the elastic return device.

[0034] In some exemplary embodiments of the present application, the first support plate may include a first edge portion, and the first edge portion is provided at the central portion in the circumferential direction of the radially outer portion of the first support plate. 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, so as to bias the first support plate and the first friction material member away from the brake disc in the axial direction.

[0035] The second support plate may include a second edge portion, and the second edge portion may be provided at the central portion in the circumferential direction of the radially outer portion of the second support plate. 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, so as to bias the second support plate and the second friction material member away from the brake disc in the axial direction.

[0036] In some exemplary embodiments of the present application, each of the first biasing arm portion and the second biasing arm portion of the elastic return device may be formed in a strip shape. Each of the first biasing arm portion and the second biasing arm portion may include: a first arc portion, a strip extension portion, a second arc portion, and a biasing inclined portion. The first arc portion is connected to the second central portion and extends from the second central portion along a direction towards the radially inner side. The strip extension portion is connected to the first arc portion and extends in a plane substantially perpendicular to the axial direction. The biasing inclined portions are angled with respect to the strip extension portion in a cross-section passing through the center point of the elastic return device and perpendicular to the tangential central axis of the elastic return device. The second arc portion is disposed between the strip extension portion and the biasing inclined portion and connects the strip extension portion and the biasing inclined portion.

[0037] In some exemplary embodiments of the present application, a first orifice may be provided at the second arc portion of each of the first biasing arm portion and the second biasing 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 is arranged adjacent to the biasing inclined portion. Each of the first biasing arm portion and the second biasing arm portion includes a first overhanging portion extending from the second radially outer edge portion of the first orifice in a manner parallel to the strip extension portion. The first overhanging portion is configured to limit the radially inward movement of each of the first biasing arm portion and the second biasing arm portion.

[0038] In some exemplary embodiments of the present application, 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.

[0039] In some exemplary embodiments of the present application, the biasing inclined portion may be configured to abut against the edge portion of a corresponding one of the first support plate and the second support plate in a point contact manner.

[0040] In some exemplary embodiments of the present application, a second orifice is provided at a portion of the strip extension portion of each of the first biasing arm portion and the second biasing arm portion that is connected to the second arc 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 adjacent to the biasing inclined portion. Each of the first biasing arm portion and the second biasing arm portion includes a second overhanging portion protruding from the third radially inner edge portion of the second orifice in a manner parallel to the biasing inclined portion. The second overhanging portion may be configured to limit the radially inward movement of each of the first biasing arm portion and the second biasing arm portion.

[0041] In some exemplary embodiments of the present application, the second biasing arm portion can be arranged to be a mirror image of the first biasing arm portion with respect to a second symmetry plane, and the second symmetry plane can be defined as passing through the tangential central axis of the elastic return device and being perpendicular to the axial central axis of the elastic return device.

[0042] In some exemplary embodiments of the present application, the first central portion of the mounting portion and the second central portion of the biasing portion are connected by a riveting member. By means of the riveting member, rapid and fixed connection of the mounting portion of the elastic return device and the biasing portion can be achieved, and reliable connection between the mounting portion and the biasing portion is allowed, such that the elastic return device has good anti-vibration and anti-impact performance.

[0043] Through the following detailed description of the exemplary embodiments of the present application in conjunction with the drawings, the above-mentioned features and advantages of the present application as well as other features and advantages will become more obvious. Description of the Drawings

[0044] In all the drawings, the same or corresponding technical features or components will be denoted by the same or corresponding reference numerals. In the drawings, the dimensions and relative positions of the various components are not necessarily drawn to scale. In the drawings:

[0045] Figure 1 is a schematic perspective view of a disc brake according to an exemplary embodiment of the present application.

[0046] Figure 2 is a schematic exploded perspective view of a brake caliper of a disc brake according to an exemplary embodiment of the present application.

[0047] Figure 3 is a schematic perspective view of a disc brake according to an exemplary embodiment of the present application, wherein the first elongated shaft, the second elongated shaft, and the elastic return device are removed.

[0048] Figure 4 is Figure 3 the schematic top view of the disc brake shown according to an exemplary embodiment of the present application.

[0049] Figure 5 is a schematic perspective view of the first elongated shaft and the second elongated shaft of a disc brake according to an exemplary embodiment of the present application.

[0050] Figure 6 is a schematic perspective view of the first elongated shaft, the second elongated shaft, and a friction lining assembly of a disc brake according to an exemplary embodiment of the present application.

[0051] Figure 7Schematic perspective view of the first elongated shaft, second elongated shaft, friction lining assembly, and elastic return device of a disc brake according to another exemplary embodiment of the present application.

[0052] Figure 8 Top view of the elastic return device according to an exemplary embodiment of the present application.

[0053] Figure 9 Schematic perspective view of the mounting portions of the first elongated shaft, second elongated shaft, and elastic return device of a disc brake according to an exemplary embodiment of the present application.

[0054] Figure 10 Is Figure 9 Schematic view of the mounting portions of the first elongated shaft, second elongated shaft, and elastic return device of the disc brake shown, viewed along the axial direction.

[0055] Figure 11 Schematic perspective view of a part of the biasing portion of the elastic return device of a disc brake according to an exemplary embodiment of the present application.

[0056] Figure 12 Schematic perspective view of the elastic return device of a disc brake according to another exemplary embodiment of the present application. Detailed Description of the Embodiment

[0057] The present application will be described in detail below with reference to the accompanying drawings by means of exemplary embodiments. It should be noted that the exemplary embodiments of the present application are intended to enable those of ordinary skill in the art to easily implement the present application. The various embodiments of the present application can be implemented in many different forms and should not be construed as limited to the embodiments set forth in the present application. Accordingly, the following detailed description of the present application is for illustrative purposes only and is in no way a limitation of the present application. In addition, the same reference numerals are used in the respective drawings to denote the same components. Additionally, the terms "first", "second", etc. are for descriptive convenience only and are not to be construed as indicating or implying relative importance or relative order.

[0058] It should also be noted that, for clarity, not all features of the actual specific embodiments are described and shown in the specification and drawings, and, to avoid unnecessary details obscuring the technical solutions of interest in the present application, only the device structures closely related to the technical solutions of the present application are described and shown in the drawings and specification, while other details that are not closely related to the technical content of the present application and are known to those skilled in the art are omitted.

[0059] Next, an exemplary embodiment of a disc brake according to the present application will be described in detail with reference to the accompanying drawings. The disc brake 1 may include a brake disc 10 (refer to Figure 4) A brake caliper 20 and a resilient return device 200. The brake disc 10 can be mounted on the wheel hub and rotate with the wheel. As Figures 1 to 4 shown, the wheel and the brake disc 10 are configured to rotate about a rotation axis X-X. The brake disc 10 can define an axial direction A-A parallel to the rotation axis X-X, a radial direction R-R perpendicular to the rotation axis X-X, and a tangential direction B-B perpendicular to both the axial direction A-A and the radial direction R-R. For clarity and simplicity of description, the rotation axis X-X, the axial direction A-A, the radial direction R-R, the tangential direction B-B, and the circumferential direction C-C are labeled in the figure. The circumferential direction C-C generally refers to the circumferential direction of the caliper body of the brake caliper.

[0060] It should be understood that the orientation or positional relationship indicated by terms such as "axial", "radial", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying 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 construed as a limitation of the present application.

[0061] In some exemplary embodiments of the present application, as Figures 1 to 4 shown, the brake caliper 20 can have a caliper body 201 and a friction pad assembly accommodated in the caliper body 201. The resilient return device 200 can be arranged to straddle the brake disc 10, and the resilient return device 200 exerts an elastic action on 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.

[0062] The brake caliper 20 can have an elongated shaft mounted at a radially outer portion of the caliper body 201. The elongated shaft extends substantially along the axial direction A-A and is arranged outside the friction pad assembly in the radial direction R-R. The resilient return device 200 can include a mounting portion 22 and a biasing portion 24 connected to the mounting portion 22. The mounting portion 22 is detachably connected to the elongated shaft, and the biasing portion 24 is configured to abut against the friction pad assembly to exert an elastic biasing force on the friction pad assembly at least in the axial direction A-A and the radial direction R-R.

[0063] According to the elastic return device of the present application, the mounting portion of the elastic return device is detachably connected to the corresponding long shaft. Compared with the prior art solution of mounting the elastic return device (also known as the return spring) on the central bridge portion of the caliper body, the present application can mount the elastic return device on the mounting shaft (such as a pin shaft) located 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 portion on the caliper body, the number of components of the brake caliper is reduced, the complexity of the brake caliper body is reduced, and thus the manufacturing process is simplified. Additionally, since the manufacturing material of the caliper body is reduced, the manufacturing cost is further reduced, and the caliper body is made lighter. In particular, when replacing the worn friction pad assembly in the brake caliper of the present application, by disassembling the mounting shaft straddling the friction pad assembly, the friction pad assembly can be quickly disassembled and replaced, thereby improving the replacement operation efficiency.

[0064] In some exemplary embodiments, the elastic return device may be made of a metal elastic element. The metal elastic element may be formed by a thin plate, a strip, a metal wire member, etc. The elastic return device made of a metal elastic element may have good strength and toughness, be able to withstand large tensile or compressive loads, have 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 state 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 the undesired friction between the friction pad assembly and the brake disc 10 when the brake is deactivated, and further reducing or eliminating the residual braking torque (residual torque) caused by the undesired contact between the friction pad assembly and the brake disc, so as to reduce the fuel consumption and / or power consumption of the vehicle.

[0065] In some exemplary embodiments, as Figure 1 and Figure 2 shown, the long shaft may include a first long shaft 101 and a second long shaft 103, and the first long shaft 101 and the second long shaft 103 are arranged parallel to each other and spaced apart from each other in the circumferential direction C-C 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 long shaft 101, a second mounting arm portion 223 connected to the second long shaft 103, and a first central portion 222 located between the first mounting arm portion 221 and the second mounting arm portion 223.

[0066] In some exemplary embodiments, as Figure 2As shown, the friction pad assembly may include a first friction pad assembly and a second friction pad assembly. The first friction pad assembly has a first support plate 31 and a first friction material member 32 mounted on the first support plate 31. The second friction pad assembly has 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 face each other in the axial direction A-A. The biasing portion 24 of the elastic return device 200 may include 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.

[0067] According to the elastic return device provided by the present application, the elastic return device having two mounting arm portions and two biasing arm portions is formed in a substantially cross shape. The two biasing arm portions are arranged on opposite sides of the second central portion 242 of the biasing portion 24, and can 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.

[0068] In some exemplary embodiments, as Figures 2 to 4 shown, the caliper body 201 forms an opening 206 on the radially outer portion 215, such that at least a part of the first friction pad assembly and the second friction pad assembly is exposed. 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, and a third mounting hole 232 and a fourth mounting hole 233 for receiving the second elongated shaft 103. As Figure 3 shown, the first mounting hole 230 and the second mounting hole 231 are aligned in the axial direction A-A, 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 A-A, and the third mounting hole 232 is spaced apart from the first mounting hole 230 in the circumferential direction C-C of the caliper body 201, and the fourth mounting hole 233 is spaced apart from the second mounting hole 231 in the circumferential direction C-C of the caliper body 201. 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.

[0069] In some exemplary embodiments, as Figure 2 and Figure 3As shown, the opening 206 of the caliper body 201 may be formed to include a first elongated side portion 261 and a second elongated side portion 262 that are opposite to each other in the axial direction A-A. 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 Figure 5 As shown, each of the first elongated shaft 101 and the second elongated shaft 103 includes a first end portion 113 and a second end portion 115 that are opposite to each other. The first end portion 113 is formed as a tapered tip portion, and an annular recess may be provided near the second end portion 115, and an elastic connecting member 116 is mounted in the annular recess. In some examples, the elastic connecting member may be formed as an elastic bushing. Optionally, the elastic bushing may be made of materials such as polyurethane, butyl rubber, neoprene, silicone rubber, etc.

[0070] In some exemplary embodiments, the first mounting hole 230 is fixedly connected to the 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. The third mounting hole 232 may be fixedly connected to the elastic connecting member mounted on the second elongated shaft 103 in an interference fit manner, and the first end portion of the second elongated shaft 103 is inserted through the fourth mounting hole 233.

[0071] As Figures 5 to 9 As shown, 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, and the first intermediate connecting portion 114 may be arranged to be connected to the first mounting arm portion 221 of the elastic return device.

[0072] A first notch portion 310 is provided at the radially outer portion of the first support plate 31 of the first friction pad assembly, and a second notch portion 311 is provided at the 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 A-A, 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.

[0073] 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.

[0074] The second elongated shaft 103 may include a second intermediate connection portion 118 located between its first end portion 113 and second end portion 115, and the second intermediate connection portion 118 is arranged to be connected to the second mounting arm portion 223 of the elastic return device.

[0075] As Figure 3 shown, a third notch portion 314 may be provided at a radially outer portion of the first support plate 31 of the first friction pad assembly, and 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 A-A, 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.

[0076] The diameter of the second intermediate connection 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.

[0077] 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 is set to be the same as the axial dimension of the second mounting arm portion 223.

[0078] Optionally, the length of each of the first elongated shaft 101 and the second elongated shaft 103 may be set within a range between 90 mm and 120 mm, and the circumferential spacing between the first elongated shaft 101 and the second elongated shaft 103 may be set within a range between 60 mm and 120 mm.

[0079] In some examples, the first elongated shaft and the second elongated shaft may be set to be the same or different. It should be understood that the dimensions and arrangements of the first elongated shaft 101 and the second elongated shaft 103 are not limited to the above exemplary descriptions, but may be set according to the configuration of the elastic return device and specific installation requirements.

[0080] In some exemplary embodiments, as Figure 7 shown, the first mounting arm portion 221 of the mounting portion 22 may be provided with a first winding portion 60 fixedly connected to the first intermediate connection portion 114 of the first elongated shaft 101, and the first winding portion 60 winds around at least a part of the first intermediate connection portion 114 and fits with at least a part of the outer circumferential surface of the first intermediate connection portion 114.

[0081] 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 connecting portion 118 of the second elongated shaft 103. The second winding portion 62 winds around at least a part of the second intermediate connecting portion 118 and fits against at least a part of the outer circumferential surface of the second intermediate connecting portion 118.

[0082] In some other exemplary embodiments, as Figures 8 to 10 shown, the first mounting arm portion 221 of the mounting portion 22 may be provided with a first clamping portion fixedly connected to the first intermediate connecting portion 114 of the first elongated shaft 101. The first clamping portion includes: a first tab 251 extending toward the first central portion 222 of the mounting portion 22; a first clamping strip portion 277 connected to the first tab 251 and angled relative to the first tab; and a first concave receiving portion 276 connected to the first clamping strip portion 277. At least a part of the first intermediate connecting portion 114 of the first elongated shaft 101 is received in the space defined by the first concave receiving portion 276, the first clamping strip portion 277, and the first tab 251. The first tab 251 and the first mounting arm portion 221 are formed as an integral piece.

[0083] The second mounting arm portion 223 of the mounting portion 22 may be provided with a second clamping portion fixedly connected to the second intermediate connecting portion 118 of the second elongated shaft 103. The second clamping portion may include a second tab extending toward the first central portion 222 of the mounting portion 22; a second clamping strip portion connected to the second tab and angled relative to the second tab; and a second concave receiving portion connected to the second clamping strip portion. At least a part of the second intermediate connecting portion 118 of the second elongated shaft 103 is received in the space defined by the second concave receiving portion, the second clamping strip portion, and the second tab. The second tab and the second mounting arm portion 223 are formed as an integral piece.

[0084] In some exemplary embodiments, the second elongated shaft 103 may be arranged to be a mirror image of the first elongated shaft 101 about a first symmetry plane. The first mounting hole 230 is arranged to be a mirror image of the third mounting hole 232 about the first symmetry plane. The second mounting hole 231 is arranged to be a mirror image of the fourth mounting hole 234 about the first symmetry plane. Wherein, the first symmetry plane is defined as passing through the axial central axis E-E of the elastic return device 200 (see Figure 8 ) and perpendicular to the tangential central axis F-F of the elastic return device.

[0085] In some exemplary embodiments, as Figure 10As shown, 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 A-A, 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-shaped or V-shaped shape in a cross-section perpendicular to the axial direction.

[0086] In Figure 10 In the illustrated embodiment, the first mounting arm portion 221 can be arranged to be a mirror image of the second mounting arm portion 223 with respect to the first symmetry plane. The first symmetry plane is defined as passing through the axial center axis E-E of the elastic return device 200 and perpendicular to the tangential center axis F-F of the elastic return device.

[0087] The plurality of strip portions of each of the first mounting arm portion 221 and the second mounting arm portion 223 can include (for example, sequentially include): a first strip portion 271, a second strip portion 273, a third strip portion 275, and a clamping strip portion 277. The first strip portion 271 extends from the first central portion 222 of the mounting portion 22 in a direction toward the radially inner side. A first rounded corner portion 272 is provided between the first strip portion 271 and the second strip portion 273. A second rounded corner portion 274 is provided between the second strip portion 273 and the third strip portion 275. A concave accommodating portion 276 is provided between the third strip portion 275 and the clamping strip portion 277. The first rounded corner portion 272 and the first concave accommodating portion 276 are formed as the trough portions of the 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 corner portion 274 is formed as the peak portion of the 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 is at least partially in contact with the corresponding one of the first elongated shaft 101 and the second elongated shaft 103.

[0088] It should be understood that the shapes, sizes, and arrangement manners of the first mounting arm portion 221, the second mounting arm portion 223, and the corresponding strip portions are not limited to the above exemplary description, but can be set according to the specific needs of the elastic return device.

[0089] In some exemplary embodiments, the first support plate 31 may include a first edge portion (not shown) disposed at a central portion in the circumferential direction C-C of the caliper body 201 on the radially outer portion of the first support plate. The first biasing arm portion 241 of the elastic return device 200 is configured to abut against the first edge portion to apply an elastic action on the first edge portion, thereby biasing the first support plate 31 and the first friction material member 32 away from the brake disc 10 in the axial direction A-A. In some examples, the first biasing arm portion 241 of the elastic return device 200 may be configured to abut against the first edge portion of the first friction pad assembly to apply an elastic biasing force on the first edge portion at least in the axial direction A-A and the radial direction R-R, so as to bias the first friction pad assembly away from the brake disc 10 in the axial direction A-A and reduce the vibration of the first friction pad assembly (the first support plate 31 and the first friction material member 32) in the radial direction R-R.

[0090] As Figure 2 , Figure 6 and Figure 7 shown, the second support plate 33 may include a second edge portion 321 disposed at a central portion in the circumferential direction of the caliper body on the radially outer portion of the second support plate. The second biasing arm portion 243 of the elastic return device 200 is configured to abut against the second edge portion 321 to apply an elastic action 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 A-A. In some examples, the second biasing arm portion 243 of the elastic return device 200 may be configured to apply an elastic biasing force on the second edge portion at least in the axial direction A-A and the radial direction R-R, so as to bias the second friction pad assembly away from the brake disc 10 in the axial direction A-A and reduce the vibration of the second friction pad assembly (the second support plate 33 and the second friction material member 34) in the radial direction R-R.

[0091] 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 A-A.

[0092] 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 may be formed to be in a strip shape. The first biasing arm portion 241 and the second biasing arm portion 243 (as Figure 11Each of those shown in the figure may include: a first arcuate portion 24A, a strip-shaped extension portion 24B, a second arcuate portion 24C, and an offset inclined portion 24D. The first arcuate portion 24A is connected to the second central portion 242 and extends from the second central portion 242 in a direction toward the radially inner side. The strip-shaped extension portion 24B is connected to the first arcuate portion 24A and extends in a plane substantially perpendicular to the axial direction A-A. The offset inclined portion 24D forms an angle with 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 central axis F-F of the elastic return device 200 (refer to Figure 8 ). The second arcuate portion 24C is disposed between the strip-shaped extension portion 24B and the offset inclined portion 24D and connects the strip-shaped extension portion 24B and the offset inclined portion 24D.

[0093] It should be understood that, as Figure 8 shown, the tangential central axis F-F of the elastic return device 200 is the central axis that bisects the elastic return device 200 into two halves along the tangential direction B-B in the top view of the elastic return device 200. The axis central axis E-E of the elastic return device 200 is the central axis that bisects the elastic return device 200 into two halves along the axial direction A-A in the top view of the elastic return device 200.

[0094] In some examples, the radius of curvature of the first arcuate portion 24A during braking is set in the range between 9 mm and 11 mm, and the radius of curvature of the second arcuate portion 24C can be set in the range between 1 mm and 3 mm. Optionally, the radius of curvature of the second arcuate portion 24C can be set to 2 mm, and the radius of curvature of the second arcuate portion 24C during braking can always be 2 mm.

[0095] In some examples, each of the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 can be designed such that: the first angle formed by the strip-shaped extension portion 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 F-F of the elastic return device 200 is 104 degrees or 106 degrees. Optionally, during braking, the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 undergo elastic deformation, and the first angle formed by the strip-shaped extension portion 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 F-F of the elastic return device 200 can vary in the range between 83 degrees and 106 degrees.

[0096] In some examples, each of the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 can be designed such that: the second angle formed by the biasing inclined portion 24D and 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 central axis F-F of the elastic return device 200 can be 109 degrees or 118 degrees. Optionally, during the braking process, the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 undergo elastic deformation, and the second angle formed by the biasing inclined portion 24D and 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 central axis F-F of the elastic return device 200 can vary within a range between 112 degrees and 118 degrees.

[0097] It should be understood that the dimensions and arrangements of the first biasing arm portion 241 and the second biasing arm portion 243 are not limited to the exemplary embodiments described herein, but can be adjusted according to actual situations.

[0098] In some exemplary embodiments, a first orifice 28 may be provided at the second arcuate portion 24C of each of the first biasing arm portion 241 and the second biasing arm portion 243. The first orifice 28 includes a first radially inner edge portion 281 and a second radially outer edge portion 283 that are opposite to each other. The first radially inner edge portion 281 is arranged adjacent to the biasing inclined portion 24D. Each of the first biasing arm portion 241 and the second biasing arm portion 243 includes a first overhanging portion 290 that extends from the second radially outer edge portion 283 of the first orifice in a manner parallel to the strip-shaped extension portion 24B. The first overhanging portion 290 is configured to limit the radially inward movement of each of the first biasing arm portion 241 and the second biasing arm portion 243. The first overhanging portion 290 can be formed as an anti-detachment structure. Specifically, when the elastic return device 200 is manually installed between the first friction pad assembly and the second friction pad assembly that are opposite to each other, each of the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 is subjected to a pressing force from the installer and moves substantially radially inward. Due to the provision of the first overhanging portion 290, the radially inward movement of the first biasing arm portion 241 and the second biasing arm portion 243 can be limited, thereby effectively preventing the biasing inclined portion 24D of the biasing arm portion from disengaging from the support plate of the corresponding friction pad assembly.

[0099] In some exemplary embodiments, the biasing inclined portion 24D is configured to abut against a corresponding edge portion of a corresponding support plate in a point contact manner. For example, in the case where the second support plate 33 is provided with a second edge portion 321 having an arc shape, the biasing inclined portion 24D of the second biasing arm portion 243 abuts against the second edge portion 321 in a point contact manner. Optionally, during the braking process and the release of the braking action of the disc brake, the biasing inclined portion 24D of the second biasing arm portion 243 abuts against the second edge portion 321 of the second support plate 33 in a point contact manner, and correspondingly, the biasing inclined portion 24D of the first biasing arm portion 241 abuts against the first edge portion of the first support plate 31 in a point contact manner.

[0100] In some other exemplary embodiments, 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 that is connected to the second arc portion 24C. The second orifice 40 includes a third radially inner edge portion 401 and a fourth radially outer edge portion 403 that face each other. The third radially inner edge portion 401 is arranged adjacent to the biasing inclined portion 24D. Each of the first biasing arm portion 241 and the second biasing arm portion 243 includes a second overhanging portion 292 that protrudes from the third radially inner edge portion 401 of the second orifice 40 in a direction parallel to the biasing inclined portion 24D. The second overhanging portion 292 is configured to limit the radially inward movement of each of the first biasing arm portion 241 and the second biasing arm portion 243. The second overhanging portion 292 can be formed into an anti-detachment structure. Specifically, when the elastic return device 200 is manually installed between the first friction pad assembly and the second friction pad assembly that face each other, each of the first biasing arm portion 241 and the second biasing arm portion 243 of the elastic return device 200 is radially inwardly moved by the pressing force from the installer. Due to the provision of the second overhanging portion 292, the radially inward movement of the first biasing arm portion 241 and the second biasing arm portion 243 can be limited, thereby effectively avoiding the disengagement of the biasing inclined portion 24D of the biasing arm portion from the support plate of the corresponding friction pad assembly.

[0101] In some exemplary embodiments, the second biasing arm portion 243 can be provided to be mirror-symmetrical to the first biasing arm portion 241 with respect to a second symmetry plane, which is defined as passing through the tangential central axis F-F of the elastic return device 200 and perpendicular to the axial central axis E-E of the elastic return device 200.

[0102] In some exemplary embodiments, the first central portion 222 of the mounting portion 22 and the second central portion 242 of the biasing portion 24 are connected by a riveting member 400 (such as Figure 12... are connected as shown. Both the first central portion 222 and the second central portion 242 may be provided with riveting holes, which may be formed in the following shapes: circular, plum blossom-shaped, or square with rounded corners. By connecting the riveting member 400 with the riveting holes provided in the first central portion 222 and the second central portion 242 in an interference fit manner, the structural stability of the elastic return device is improved. In addition, the cost of riveting connection is relatively low, and the connection between the installation part 22 and the biasing part 24 of the elastic return device 200 can be completed more quickly and efficiently, and the elastic return device 200 has good earthquake and shock resistance performance.

[0103] Although the present application has been described with reference to exemplary embodiments, it should be understood that the present application is not limited to the specific embodiments described and illustrated in detail herein. Without departing from the scope defined by the claims of the present application, those skilled in the art can make various changes to the exemplary embodiments.

[0104] The features mentioned and / or illustrated in the above description of the exemplary embodiments of the present application may be combined in the same or similar manner into one or more other embodiments, for example, combined with the features in other embodiments or substituted for the corresponding features in other embodiments. The technical solutions obtained by such combination or substitution should also be regarded as being included within the protection scope of the present application.

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 (X-X), the brake disc (10) defining an axial direction (A-A) parallel to the rotation axis (X-X), a radial direction (R-R) perpendicular to the rotation axis (X-X), and a tangential direction (B-B) perpendicular to both the axial direction (A-A) and the radial direction (R-R). The brake caliper (20) has a caliper body (201) and a friction pad assembly received in the caliper body (201), the elastic return device (200) being arranged to straddle the brake disc (10), and the elastic return device (200) applying 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. Characterized in that the brake caliper (20) has an elongated shaft mounted at a radially outer portion (215) of the caliper body (201), the elongated shaft extending substantially along the axial direction (A-A) and being arranged outside the friction pad assembly in the radial direction (R-R), the elastic return device (200) comprising a mounting portion (22) and a biasing portion (24) connected to the mounting portion, the mounting portion (22) being detachably connected to the elongated shaft, and the biasing 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 (A-A) and the radial direction (R-R).

2. The disc brake according to claim 1,[ Characterized in that the elongated shaft includes 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 the circumferential direction (C-C) of the caliper body (201). The mounting portion (22) of the elastic return device (200) includes 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 includes a first friction pad assembly and a second friction pad assembly. The first friction pad assembly has a first support plate (31) and a first friction material member (32) mounted on the first support plate (31). The second friction pad assembly has 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 face each other in the axial direction (A-A). The biasing portion (24) of the elastic return device (200) includes 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, wherein, the caliper body (201) forms an opening (206) on the radially outer portion (215) such that at least a part of the first friction pad assembly and the second friction pad assembly is 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 (A-A) 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 (A-A), and the third mounting hole (232) is spaced apart from the first mounting hole (230) in the circumferential direction (C-C) of the caliper body (201), the fourth mounting hole (233) is spaced apart from the second mounting hole (231) in the circumferential direction (C-C) 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, wherein, the opening (206) is formed to include a first elongated side portion (261) and a second elongated side portion (262) facing each other in the axial direction (A-A). 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 portion (113) and a second end portion (115) opposite to each other. The first end portion (113) is formed as a tapered tip portion. An annular recess is provided near the second end portion (115), and an elastic connecting member (116) is installed in the annular recess.

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

6. The disc brake according to claim 5, wherein, the first elongated shaft (101) includes 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) is arranged 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 (A-A). 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, wherein, the second elongated shaft (103) includes a second intermediate connecting portion (118) located between its first end portion (113) and the second end portion (115). The second intermediate connecting portion is arranged 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, and 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 (A-A). 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 a first winding portion (60) fixedly connected to the first intermediate connecting portion (114) of the first elongated shaft (101) is provided on the first mounting arm portion (221) of the mounting portion (22). The first winding portion (60) winds around at least a part of the first intermediate connecting portion (114) and fits with at least a part of the circumferential surface of the first intermediate connecting portion (114); or a first clamping portion fixedly connected to the first intermediate connecting portion (114) of the first elongated shaft (101) is provided on the first mounting arm portion (221) of the mounting portion (22). The first clamping portion includes: a first tab (251) extending toward the first central portion (222) of the mounting portion (22); a first clamping belt portion (277) connected to the first tab and angled with respect to the first tab; and a first concave accommodating portion (276) connected to the first clamping belt portion (277). At least a part of the first intermediate connecting portion (114) of the first elongated shaft (101) is received in the space defined by the first concave accommodating portion, the first clamping belt portion (277), and the first tab (251). The first tab (251) and the first mounting arm portion (221) are formed as an integral part.

9. The disc brake according to claim 8 characterized in that a second winding portion (62) fixedly connected to the second intermediate connecting portion (118) of the second elongated shaft (103) is provided on the second mounting arm portion (223) of the mounting portion (22). The second winding portion winds around at least a part of the second intermediate connecting portion and fits with at least a part of the 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 engaging portion fixedly connected to the second intermediate connecting portion (118) of the second elongated shaft (103). The second engaging portion includes a second tab extending toward the first central portion (222) of the mounting portion (22); a second engaging belt portion connected to the second tab and angled relative to the second tab; and a second concave receiving portion connected to the second engaging belt portion. The second intermediate connecting portion (118) of the second elongated shaft (103) is at least partially received in a space defined by the second concave receiving portion, the second engaging belt portion, and the second tab. The second tab and the second mounting arm portion (223) are formed as an integral piece.

10. The disc brake according to any one of claims 3 to 9, characterized in that the second elongated shaft (103) is arranged to be a mirror image of the first elongated shaft (101) about a first plane of symmetry, the first mounting hole (230) is arranged to be a mirror image of the third mounting hole (232) about the first plane of symmetry, the second mounting hole (231) is arranged to be a mirror image of the fourth mounting hole (234) about the first plane of symmetry, and the first plane of symmetry is defined as passing through the axial central axis (E-E) of the elastic return device (200) and perpendicular to the tangential central axis (F-F) 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 belt portions, and two adjacent ones of the plurality of belt portions are formed to have a U-shaped or V-shaped shape in a cross-section perpendicular to the axial direction.

12. The disc brake according to claim 11, characterized in that Each of the plurality of strip portions of the first mounting arm portion (221) and the second mounting arm portion (223) includes: a first strip portion (271), a second strip portion (273), a third strip portion (275), and a clamping strip portion (277). The first strip portion (271) extends from the first central portion (222) of the mounting portion (22) in a direction toward the radially inner side. A first rounded corner portion (272) is provided between the first strip portion (271) and the second strip portion (273). A second rounded corner portion (274) is provided between the second strip portion (273) and the third strip portion (275). A first concave accommodating portion (276) is provided between the third strip portion (275) and the clamping strip portion (277). The first rounded corner portion (272) and the concave accommodating portion (276) are formed as the trough portions of the 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 corner portion (274) is formed as the crest portion of the 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) is at least partially in contact with the corresponding one of the first elongated shaft (101) and the second elongated shaft (103).

13. The disc brake according to claim 12, wherein, the first mounting arm portion (221) is arranged to be mirror - imaged with respect to a first symmetry plane with the second mounting arm portion (223). The first symmetry plane is defined as passing through the axial central axis (E - E) of the elastic return device (200) and perpendicular to the tangential central axis (F - F) of the elastic return device.

14. The disc brake according to any one of claims 2 to 9, wherein, the first support plate (31) includes a first edge portion. The first edge portion is provided at the central portion of the radially outer portion of the first support plate in the circumferential direction (C - C) of the caliper body (201). The first biasing arm portion (241) of the elastic return device (200) is configured to abut against the first edge portion to apply an elastic action on the first edge portion, so as to bias the first support plate (31) and the first friction material member (32) away from the brake disc (10) in the axial direction (A - A); and The second support plate (33) includes a second edge portion (321) which is provided at a central portion in the circumferential direction of the radially outer portion of the second support plate (33). The second biasing arm portion (243) of the elastic return device (200) is configured to abut against the second edge portion (321) to apply an elastic action 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 (A-A).

15. The disc brake according to claim 14, wherein, 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 strip shape. Each of the first biasing arm portion (241) and the second biasing arm portion (243) includes: a first arc portion (24A), a strip-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 radially inner side. The strip-shaped extension portion (24B) is connected to the first arc portion (24A) and extends in a plane substantially perpendicular to the axial direction (A-A). The biasing inclined portion (24D) forms an angle with respect 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 central axis (F-F) of the elastic return device (200). The second arc portion (24C) is provided between the strip-shaped extension portion (24B) and the biasing inclined portion (24D) and connects the strip-shaped extension portion (24B) and the biasing inclined portion (24D).

16. The disc brake according to claim 15, wherein, 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 includes a first radially inner edge portion (281) and a second radially outer edge portion (283) which are opposite to each other. The first radially inner edge portion is arranged adjacent to the biasing inclined portion (24D). Each of the first biasing arm portion (241) and the second biasing arm portion (243) includes a first overhanging portion (290) extending from the second radially outer edge portion (283) of the first orifice in a manner parallel to the strip-shaped extension portion (24B). The first overhanging portion (290) is 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, wherein, 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 arcuate shape in a cross-section perpendicular to the axial direction (A-A).

18. The disc brake according to claim 17, wherein, the biasing 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, wherein, 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 arcuate portion (24C), a second orifice (40) is provided, the second orifice (40) includes 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) is arranged adjacent to the biasing inclined portion (24D), and each of the first biasing arm portion (241) and the second biasing arm portion (243) includes a second overhanging 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), and the second overhanging portion (292) is configured to limit the radially 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, wherein, the second biasing arm portion (243) is arranged to be mirror-symmetrical with the first biasing arm portion (241) about a second symmetry plane, the second symmetry plane is defined as passing through the tangential central axis (F-F) of the elastic return device (200) and perpendicular to the axial central axis (E-E) of the elastic return device (200).

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

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