Brake assembly with active piston retraction

Abstract

Brake assembly (10), comprising: a brake piston (200) configured to be movable for a brake application or solution, wherein the brake piston (200) has an inner wall forming a piston cavity (210); a linearly movable structure (300) arranged within the piston cavity (210) of the brake piston (200), wherein the linearly movable structure (300) is configured to be linearly movable within the piston cavity (210) in response to a rotation of a rotatable structure (400) which is operationally coupled to the linearly movable structure (300); and a magnet (500) attached to the linearly movable structure (300) and arranged between the brake piston (200) and the linearly movable structure (300), such that the brake piston (200) is movable towards the linearly movable structure (300) in response to a linear movement of the linearly movable structure (300) by a magnetic field generated by the magnet (500), wherein the brake piston (200) has magnetically attractive material which is designed to attract the magnet (500) so that an attractive magnetic force is generated between the brake piston (200) and the magnet (500) attached to the linearly movable structure (300), wherein the magnet (500) is arranged in an inner groove (510) formed on an inner circumferential surface at an end section of the linearly movable structure (300).

Description

STATE OF THE ART

[0001] Various embodiments of the present disclosure generally relate to brake assemblies for a vehicle and in particular to a brake assembly with an improved structure for retracting a brake piston during a release process of an electric parking brake.

[0002] In general, a brake assembly can comprise a service brake assembly and a parking brake assembly. The service brake assembly may include a rotor, a caliper, and brake shoes on opposite sides of the rotor. The caliper is slidably supported on pins attached to a mounting bracket, which is mounted to a non-rotating component of the vehicle. It contains one or more piston bores, each housing a piston that moves along a piston axis when the brake is applied and released. The brake shoes are connected to one or more hydraulically or pneumatically actuated pistons for movement between a non-braking position and a braking position, in which the brake shoes are brought into frictional engagement with the opposing braking surfaces of the rotor.For example, if an operating process of the vehicle depresses a brake pedal, the brake fluid can move the piston into contact with a brake pad and then move one brake pad into contact with one side of the rotor, while another, opposing brake pad is moved into contact with an opposite side of the rotor.

[0003] When a vehicle is stopped or parked, the parking brake assembly can be used to prevent the vehicle from moving. The parking brake assembly can be a standalone unit or it can utilize one or more components of the service brake assembly. This means the parking brake assembly can use the piston and brake pads of the service brake assembly to generate brake actuation. For example, the parking brake assembly can move the piston, which brings the brake pads into contact with the rotor to generate and maintain brake actuation by applying a clamping force to the rotor.

[0004] From JP S58 - 128 542 A, a mechanism for a floating caliper disc brake and a method for manufacturing and assembling the same are known, wherein two magnets are arranged on the side of a holder and on the side of a hollow piston such that they have the same polarity to each other and repel each other.

[0005] A disc brake for a motor vehicle is known from DE 10 2010 033 255 A1. The disc brake comprises a housing, a brake disc rotatable relative to the housing, at least one friction lining, and at least one actuating device. The actuating device is designed to effect a relative movement between the brake disc and the friction lining so that the friction lining can be brought into contact with the brake disc. The actuating device has at least one actuating piston that is hydraulically guided and displaceable within the housing. The actuating piston is displaceable within the housing hydraulically and via a mechanical actuator.It is provided that the actuating piston is coupled to the mechanical actuator via an elastically deformable drive arrangement, whereby the drive arrangement provides a return movement according to its elastic deformation as a result of a relative displacement between the actuating piston and the actuator.

[0006] KR 10 2015 0 069 695 A describes a brake caliper brake that improves the return force of a piston when releasing the brakes of a vehicle. The brake caliper brake comprises a carrier in which a pair of pad plates are installed, which slide back and forth; a brake caliper housing that is slidably mounted on the carrier and has a cylinder in which the piston is installed.

[0007] US Patent 5,046,404 A discloses a magnetic disc brake retractor with a magnet mounted in the housing of a hydraulic disc brake and adjustable in its position relative to a brake piston. The brake housing is made of a non-ferrous material to prevent interference with the magnetic field. The magnet is used to exert a force on the piston, retracting it when the brake pedal is released. The position of the magnet within the brake housing chamber is adjustable to vary the strength of the magnetic field acting on the piston and to mechanically limit the piston's retraction.

[0008] Furthermore, a hydraulically actuated brake system with a master brake cylinder is known from DE 10 2008 037 720 A1, the at least one working chamber of which is connected via at least one hydraulic line to at least one wheel brake or parking brake of the vehicle, wherein an actuator adjusts at least one brake pad of a wheel brake to achieve a ventilation clearance.

[0009] With these and other general considerations in mind, the following embodiments have been described. Although relatively specific problems have been discussed, it is also understood that the embodiments should not be limited to solving the problems specified in the prior art. SUMMARY

[0010] The features and advantages of the present disclosure will be more easily understood and apparent from the following detailed description, which should be read in conjunction with the accompanying drawings, and from the claims appended at the end of the detailed description.

[0011] According to various embodiments of the present disclosure, a brake assembly may comprise: a brake piston configured to be movable for a braking application or solution, wherein the brake piston has an inner wall forming a piston cavity; a linearly movable structure arranged within the piston cavity of the brake piston, wherein the linearly movable structure is configured to be movable linearly within the piston cavity in response to a rotation of a rotatable structure operably coupled to the linearly movable structure; and a magnet arranged between the brake piston and the linearly movable structure such that the brake piston is movable towards the linearly movable structure in response to a linear movement of the linearly movable structure by a magnetic field generated by the magnet.

[0012] In some exemplary embodiments of the present disclosure, the magnet can be attached to the linearly movable structure, and the brake piston can have magnetically attractive material that can be attracted by the magnet, so that a magnetic attraction force can be generated between the brake piston and the magnet attached to the linearly movable structure.

[0013] In certain exemplary embodiments of the present disclosure, the magnet can be arranged in an inner groove formed on an inner circumferential surface at an end section of the linearly movable structure. A space can be provided between the magnet attached to the linearly movable structure and the rotatable structure that is operationally coupled to the linearly movable structure. The magnet can project outwards from the inner groove of the linearly movable structure towards the inner wall of the brake piston. The inner wall of the brake piston can have a groove into which the magnet attached to the linearly movable structure can be inserted when one or both of the linearly movable structure and the brake piston approach each other.A gap may exist between an outer circumferential surface of the magnet attached to the linearly moving structure and an inner circumferential surface of the groove in the brake piston into which the magnet can be inserted. The diameter of a groove in the inner wall of the brake piston into which the magnet can be inserted may be larger than the diameter of the magnet located in an inner groove formed on an inner circumferential surface of the linearly moving structure.

[0014] In some exemplary embodiments of the present disclosure, the magnet can be arranged in an outer groove formed on an outer circumferential surface at an end section of the linearly movable structure. The inner wall of the brake piston can have a groove into which the magnet can be inserted when one or both of the linearly movable structure and the brake piston approach each other. The magnet attached to the linearly movable structure can be configured to attract the brake piston, which has the magnetically attractive material.

[0015] In certain exemplary embodiments of the present disclosure, the magnet can be attached to the inner wall of the brake piston, and the linearly movable structure can comprise magnetically attractive material that can be attracted by the magnet, so that a magnetic attraction can be generated between the linearly movable structure and the magnet attached to the brake piston. The inner wall of the brake piston can have a groove in which the magnet is mounted.

[0016] The magnet may have a bore through which the rotatable structure can pass. Alternatively, the magnet may have a concave surface configured to receive an end section of the rotatable structure and / or the linearly moving structure.

[0017] According to various embodiments of the present disclosure, a brake assembly may comprise: a brake piston configured to be movable for a braking application or solution, wherein the brake piston has an inner wall forming a piston cavity;and a linearly movable structure arranged within the piston cavity of the brake piston, wherein the linearly movable structure is configured to be movable linearly within the piston cavity in response to a rotation of a rotatable structure operably coupled to the linearly movable structure, wherein the linearly movable structure is magnetized and the brake piston has magnetically attractive material which is attracted by a magnetic field generated by the magnetized linearly movable structure, such that the brake piston is movable in response to a linear movement of the linearly movable structure by the magnetic field generated by the magnetized linearly movable structure.

[0018] According to some embodiments of the present disclosure, a brake assembly may comprise: a brake piston configured to be movable for a braking application or solution, wherein the brake piston has an inner wall forming a piston cavity;and a linearly movable structure arranged within the piston cavity of the brake piston, wherein the linearly movable structure is configured to be movable linearly within the piston cavity in response to a rotation of a rotatable structure which is operatively coupled to the linearly movable structure, wherein the brake piston is magnetized and the linearly movable structure comprises magnetically attractive material which is attracted by a magnetic field which is generated by the magnetized brake piston, such that the magnetized brake piston is movable in response to a linear movement of the linearly movable structure by a magnetic attraction force which is generated between the magnetized brake piston and the linearly movable structure which comprises the magnetically attractive material.

[0019] This summary is intended to present, in a simplified form, a selection of concepts that are described in detail below. This summary is not intended to identify key features or essential characteristics of the claimed subject matter, nor is it intended to limit the scope of the claimed subject matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various embodiments according to the present disclosure are described with reference to the drawings; they show: Fig. 1 a cross-sectional view of a brake assembly according to a first exemplary embodiment of the present disclosure; Fig. 2A a cross-sectional view of a brake assembly along cross-section AA of Fig. 1 according to the first exemplary embodiment of the present disclosure; Fig. 2B an enlarged view of a rectangular section B, which is in Fig. 2A is shown, according to the first exemplary embodiment of the present disclosure; Fig. 3A a cross-sectional view of a brake assembly in a solved condition according to the first exemplary embodiment of the present disclosure; Fig. 3B an enlarged view of a rectangular section C, which is in Fig. 3A is shown, according to the first exemplary embodiment of the present disclosure; Fig. 4A a cross-sectional view of a brake assembly in an engaged condition according to the first exemplary embodiment of the present disclosure; . Fig. 4B an enlarged view of a rectangular section D, which is in Fig. 4A is shown, according to the first exemplary embodiment of the present disclosure; Fig. 5 an expanded view of a brake assembly according to the first exemplary embodiment of the present disclosure; Fig. 6 a cross-sectional view of a brake assembly according to a second exemplary embodiment of the present disclosure; Fig. 7A a cross-sectional view of a brake assembly along cross-section EE of Fig. 6 according to the second exemplary embodiment of the present disclosure; Fig. 7B an enlarged view of a rectangular section F, which is in Fig. 7A is shown, according to the second exemplary embodiment of the present disclosure; Fig. 8A a cross-sectional view of a brake assembly in a solved condition according to the second exemplary embodiment of the present disclosure; Fig. 8B an enlarged view of a rectangular section G, which is in Fig. 8A is shown, according to the second exemplary embodiment of the present disclosure; Fig. 9A a cross-sectional view of a brake assembly in an engaged condition according to the second exemplary embodiment of the present disclosure; Fig. 9B an enlarged view of a rectangular section H, which is in Fig. 9A is shown, according to the second exemplary embodiment of the present disclosure; Fig. 10 an expanded view of a brake assembly according to the second exemplary embodiment of the present disclosure; Fig. 11 a cross-sectional view of a brake assembly according to a third exemplary embodiment of the present disclosure; Fig. 12A a cross-sectional view of a brake assembly along cross-section II of Fig. 11 according to the third exemplary embodiment of the present disclosure; Fig. 12B an enlarged view of a square section J, which is in Fig. 12A is shown, according to the third exemplary embodiment of the present disclosure; Fig. 13A a cross-sectional view of a brake assembly in a solved condition according to the third exemplary embodiment of the present disclosure; Fig. 13B an enlarged view of a rectangular section K, which is in Fig. 13A is shown, according to the third exemplary embodiment of the present disclosure; Fig. 14A a cross-sectional view of a brake assembly in an engaged condition according to the third exemplary embodiment of the present disclosure; Fig. 14B an enlarged view of a rectangular section L, which is in Fig. 14A is shown, according to the third exemplary embodiment of the present disclosure; Fig. 15 an expanded view of a brake assembly according to the third exemplary embodiment of the present disclosure; Fig. 16 a cross-sectional view of a brake assembly according to a fourth exemplary embodiment of the present disclosure; Fig. 17A a cross-sectional view of a brake assembly along cross-section MM of Fig. 17A according to the fourth exemplary embodiment of the present disclosure; Fig. 17B an enlarged view of a rectangular section N, which is in Fig. 17A is shown, according to the fourth exemplary embodiment of the present disclosure; Fig. 18A a cross-sectional view of a brake assembly in a solved condition according to the fourth exemplary embodiment of the present disclosure; Fig. 18B an enlarged view of a square section O, which is in Fig. 18A is shown, according to the fourth exemplary embodiment of the present disclosure; Fig. 19A a cross-sectional view of a brake assembly in an engaged condition according to the fourth exemplary embodiment of the present disclosure; Fig. 19B an enlarged view of a rectangular section P, which is in Fig. 19A is shown, according to the fourth exemplary embodiment of the present disclosure; Fig. 20 an expanded view of a brake assembly according to the fourth exemplary embodiment of the present disclosure; Fig. 21 a cross-sectional view of a brake assembly according to a fifth exemplary embodiment of the present disclosure; Fig. 22A a cross-sectional view of a brake assembly along cross-section QQ of Fig. 21 according to the fifth exemplary embodiment of the present disclosure; Fig. 22B an enlarged view of a rectangular section R, which is in Fig. 22A is shown, according to the fifth exemplary embodiment of the present disclosure; Fig. 23A a cross-sectional view of a brake assembly in a solved condition according to the fifth exemplary embodiment of the present disclosure; Fig. 23B an enlarged view of a rectangular section S, which is in Fig. 23A is shown, according to the fifth exemplary embodiment of the present disclosure; Fig. 24A a cross-sectional view of a brake assembly in an engaged condition according to the fifth exemplary embodiment of the present disclosure; Fig. 24B an enlarged view of a square section T, which is in Fig. 24A is shown, according to the fifth exemplary embodiment of the present disclosure; Fig. 25 an expanded view of a brake assembly according to the fifth exemplary embodiment of the present disclosure; Fig. 26 a cross-sectional view of a brake assembly according to a sixth exemplary embodiment of the present disclosure; Fig. 27A a cross-sectional view of a brake assembly along cross-section UU of Fig. 26 according to the sixth exemplary embodiment of the present disclosure; Fig. 27B an enlarged view of a square section V, which is in Fig. 27A is shown, according to the sixth exemplary embodiment of the present disclosure; Fig. 28A a cross-sectional view of a brake assembly in a solved condition according to the sixth exemplary embodiment of the present disclosure; Fig. 28B an enlarged view of a square section W, which is in Fig. 28A is shown, according to the sixth exemplary embodiment of the present disclosure; Fig. 29A a cross-sectional view of a brake assembly in an engaged condition according to the sixth exemplary embodiment of the present disclosure; Fig. 29B an enlarged view of a rectangular section X, which is in Fig. 29A is shown, according to the sixth exemplary embodiment of the present disclosure; Fig. 30 an expanded view of a brake assembly according to the sixth exemplary embodiment of the present disclosure; Fig. 31 a cross-sectional view of a brake assembly according to a seventh exemplary embodiment of the present disclosure; Fig. 32A a cross-sectional view of a brake assembly along cross-section YY of Fig. 31 according to the seventh exemplary embodiment of the present disclosure; Fig. 32B an enlarged view of a square section Z, which is in Fig. 32A is shown, according to the seventh exemplary embodiment of the present disclosure; Fig. 33A a cross-sectional view of a brake assembly in a solved condition according to the seventh exemplary embodiment of the present disclosure; Fig. 33B an enlarged view of a rectangular section AA, which is in Fig. 33A is shown, according to the seventh exemplary embodiment of the present disclosure: Fig. 34A a cross-sectional view of a brake assembly in an engaged condition according to the seventh exemplary embodiment of the present disclosure; Fig. 34B an enlarged view of a rectangular section BB, which is in Fig. 34A is shown, according to the seventh exemplary embodiment of the present disclosure; Fig. 35 an expanded view of a brake assembly according to the seventh exemplary embodiment of the present disclosure; Fig. 36 a cross-sectional view of a brake assembly according to an eighth exemplary embodiment of the present disclosure; Fig. 37A a cross-sectional view of a brake assembly along cross-section CC-CC of Fig. 36 according to the eighth exemplary embodiment of the present disclosure; Fig. 37B an enlarged view of a rectangular section DD, which is in Fig. 37A is shown, according to the eighth exemplary embodiment of the present disclosure; Fig. 38A a cross-sectional view of a brake assembly in a solved condition according to the eighth exemplary embodiment of the present disclosure; Fig. 38B an enlarged view of a rectangular section EE, which is in Fig. 38A is shown, according to the eighth exemplary embodiment of the present disclosure; Fig. 39A a cross-sectional view of a brake assembly in an engaged condition according to the eighth exemplary embodiment of the present disclosure; Fig. 39B an enlarged view of a rectangular section FF, which is in Fig. 39A is shown, according to the eighth exemplary embodiment of the present disclosure; Fig. 40 an expanded view of a brake assembly according to the eighth exemplary embodiment of the present disclosure;

[0021] Reference numerals and symbols in the various figures generally refer to corresponding parts, unless otherwise indicated. The figures were drawn to clearly illustrate the relevant aspects of the embodiments and are not necessarily drawn to scale. DETAILED DESCRIPTION OF EXECUTION FORMS

[0022] The following detailed description refers to the accompanying drawings, which form part of the present disclosure and illustrate specific embodiments in which the invention can be carried out. These embodiments are described in sufficient detail to enable a person skilled in the art to put the invention into practice. It is understood that other embodiments may be used and that structural, logical, and electrical modifications may be made without altering the scope and essence of the invention. The following detailed description is therefore not to be understood in a limiting sense, and the scope of the invention is defined only by the accompanying claims and their equivalents. Identical reference numerals in the figures refer to identical components, which should be apparent from the context of use.

[0023] With reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5. A brake assembly 10 can comprise a brake caliper 110. The brake caliper 110 can be freely movably mounted by means of a brake carrier. A brake pad assembly 120 is provided in the brake caliper 110 and comprises a brake pad 121 and a brake pad carrier 122. The brake caliper 110 can have a bridge with fingers, and the fingers of the brake caliper 110 can be in contact with the brake pad carrier 122. The brake pad 121 is arranged in a release position with a small air gap on one side of a brake rotor 125, such as a brake disc, so that no significant residual drag torque occurs. The brake pad carrier 122 is arranged between the brake pad 121 and a brake piston 200, wherein the brake pad 121 and the brake pad carrier 122 move together, and the movement of the brake pad carrier 122 causes the brake pad 121 to move in relation to the brake rotor 125.When a vehicle is in motion, the brake rotor 125 can rotate with a wheel around an axle of the vehicle. The brake caliper 110 can be connected to any non-rotating or non-moving part of a vehicle.

[0024] The brake piston 200 is movably mounted in a brake caliper cavity or bore 115, which is defined in the brake caliper 110. The brake caliper bore 115 can support the brake piston 200 within it. The brake piston 200 can be moved in a braking application direction, which can be used to move the brake pad 121 towards the brake rotor 125 to generate the clamping force. The brake piston 200 can be moved in a braking release direction, which can be used to allow the brake pad 121 to move away from the brake rotor 125 to release the clamping force.

[0025] A linearly movable structure 300 can be accommodated in the piston cavity 210 formed by the inner wall of the brake piston 200. The linearly movable structure 300 can be configured to move linearly within the piston cavity 210 formed by the inner wall of the brake piston 200. For example, the linearly movable structure 300 can be operationally coupled to a rotatable structure 400, and the linearly movable structure 300 is linearly movable in response to the rotation of the rotatable structure 400. The linearly movable structure 300 and the rotatable structure 400 can be configured to convert a power output from an actuator assembly 800 into a linear or axial force to move the brake piston 200 along an axis of the brake caliper cavity 115. The actuator assembly 800 can, for example,comprise one or more motors and one or more gears and / or belts to increase the torque output of the motor.

[0026] In an exemplary embodiment of the present disclosure, the linearly movable structure 300 may comprise a spindle nut 305, and the rotatable structure 400 may comprise a spindle 405. The linearly movable structure 300 and the rotatable structure 400 may be operatively coupled by a threaded section, a ball screw, a roller screw, a ball ramp, or any coupling structure or mechanism capable of converting the rotational motion into linear motion.

[0027] Actuating the actuator assembly 800 causes the spindle 405 to rotate, and the rotation of the spindle 405 then causes the spindle nut 305 to move linearly. The motor of the actuator assembly 800 can be directly coupled to one end of the spindle 405. Alternatively, the motor of the actuator assembly 800 can be indirectly and operationally coupled to the spindle 405 via one or more torque transmission mechanisms, such as gears, pulleys, and belts.

[0028] The spindle nut 305 can move axially either towards or away from the brake rotor 125. The direction in which the spindle nut 305 moves depends on the direction of rotation of the spindle 405. During a parking brake application, the spindle 405 rotates in an application direction, causing the spindle nut 305 to move towards the brake rotor 125. During a parking brake release, the spindle 405 rotates in the opposite release direction, causing the spindle nut 305 to move away from the brake rotor 125.

[0029] The spindle nut 305 has a head section 310, which has a conical shape and can be brought into contact with a complementary conical inner surface 205 of the brake piston 200. In a loosened position, there is a gap between the head section 310 of the spindle nut 305 and the conical inner surface 205 of the brake piston 200. The spindle nut 305 further comprises a body section 320, which extends from the head section 310 of the spindle nut 305. The outer diameter of the head section 310 of the spindle nut 305 can be larger than the outer diameter of the body section 320 of the spindle nut 305.

[0030] The spindle nut 305 can engage the spindle 405 via threads. For example, an outer surface of the spindle 405 can have a threaded section, and an inner surface of the spindle nut 305 can have a threaded section configured to engage the threaded section of the spindle 405 via threads. Alternatively, the spindle nut 305 and the spindle 405 can be coupled to each other via a ball screw or nut, a roller screw, a ball ramp, or any rotary / linear mechanism configured to convert rotary motion into linear motion.

[0031] The rotation of the spindle 405 causes the spindle nut 305 to move linearly. The rotation of the spindle nut 305 about an axis of the spindle 405 or about the spindle itself is restricted or prevented. As in Fig. As shown in Figure 1, the spindle nut 305 is wedged into the piston cavity 210 of the brake piston 200 to prevent the spindle nut 305 from rotating around the spindle 405 or the spindle axis.

[0032] When service braking is performed, the brake assembly 10 is hydraulically actuated. For example, the brake assembly 10 can be hydraulically actuated by a driver via a brake pedal or by a driver assistance system. When the brake assembly 10 is hydraulically actuated, hydraulic fluid in the piston cavity 210 is pressurized, causing the brake piston 200 to move towards the brake rotor 125 and the brake pad 121 to be pressed against the brake rotor 125 by means of the brake caliper 110. The spindle nut 300, however, remains unactuated and therefore stays in an initial axial position. During service braking, the fluid can be pressurized, which can be used to exert a fluid pressure force or a contact force on the brake piston 200. The fluid pressure force or the contact force can move the brake piston 200 in the application direction towards the brake pad 121.The pressurized fluid pressure or contact force exerted on the brake piston 200 in turn exerts a force on the brake pad carrier 122.

[0033] The operation of the parking brake of brake assembly 10 is now described. It is understood that these operating procedures or process steps can be carried out in virtually any order, and that one or more of the procedures or steps described herein can be changed, combined, omitted, or repeated.

[0034] To activate the parking brake, a signal can be transmitted from an electronic control unit (ECU) or a control unit to the actuator assembly 800 to apply the parking brake. In response to the signal from the ECU, the actuator assembly 800 applies a torque to the spindle 405 in the braking application direction, so that the torque provided by the actuator assembly 800 can cause the spindle 405 to rotate in the application direction, and then the rotation of the spindle 405 can cause the spindle nut 305 to be advanced or moved linearly in one direction of the brake rotor 125, and then cause the head section 310 of the spindle nut 300 to contact and support the inner wall of the brake piston 200 (e.g. the conical inner surface 205) until the clearance between the brake pad 121 and the brake rotor 125 is eliminated.The continued rotation of the spindle 405 and thus the linear movement of the spindle nut 305 to move the brake piston 200 and the brake pad 121 against the brake rotor 125 generates the clamping force necessary to prevent movement of the vehicle.

[0035] Finally, a leading or front end of the spindle nut 305 can contact an inner end wall of the piston cavity 210. Once contact is established between the leading or front end of the spindle nut 305 and the inner end wall of the piston cavity 210, continued rotation of the spindle 405 in the application direction, and thus continued linear movement of the spindle nut 305 in the application direction, causes the brake piston 200 to be pushed or moved toward the brake pad 121 in the application direction. Continued movement of the brake piston in the application direction ultimately causes the brake piston 200 to move or press the brake pad 121 against the brake rotor 125 to generate friction or a clamping force.

[0036] As a result, the position of the brake piston 200 in a parking brake state is fixed by the support of the spindle nut 305. Once the brake piston 200 is supported by the spindle nut 305, the hydraulic pressure in the piston cavity 210 can be released. The parking brake state is maintained by the spindle nut 300 due to the self-locking mechanism between the spindle nut 300 and the spindle 400. The brake pad 121, which presses against the brake rotor 125, is supported by the spindle nut 300.

[0037] To release the parking brake, the ECU or controller can send a parking brake release signal to the actuator assembly 800. In response to the parking brake release signal, the actuator assembly 800 applies a rotational force to the spindle 405 in a reverse direction, or brake release direction, opposite to the direction in which the spindle rotates when rotated in the application direction. This causes the spindle 405 to rotate in the opposite direction, or brake release direction, and then the spindle nut 305 to move axially in the brake release direction, or a direction away from the brake rotor 125. The linear movement of the spindle nut 305 in the brake release direction allows the brake piston 200 to relax freely and move away from the brake pad 121, thus allowing the brake pad 121 to move away from the brake rotor 125 and release the clamping force.

[0038] When the parking brake is released, pressurized hydraulic fluid is introduced into the brake cavity 210. As a result, the brake piston 200 is moved slightly towards the brake rotor 125, thus relieving the axial load on the spindle nut 305. By controlling the actuator assembly 800, the spindle nut 305 can be retracted in one direction away from the brake rotor 125 to its initial position.

[0039] The rotation of the spindle 405 in the loosening direction causes the spindle nut 305 to move linearly or axially in the loosening direction or away from the inner end wall 205 of the brake piston 200. The brake piston 200 can then move back into the brake caliper cavity 115 out of contact with the brake carrier 122, thus allowing the brake pad 121 to move out of contact with the brake rotor 125 to release the clamping force.

[0040] A magnet 500 can be positioned between the brake piston 200 and the linearly movable structure 300 (e.g., the spindle nut 305) to retract the brake piston 200 in the brake release direction during the brake release process. The magnet 500 can pull the brake piston 200 into the brake release position. The magnet 500 can be configured to generate a magnetic field such that the brake piston 200 can be moved towards the linearly movable structure 300 (e.g., the spindle nut 305) by the magnetic field generated by the magnet 500. The magnetic field strength generated by the magnet 500 can be sufficiently high to move the brake piston 200. The magnet 500 can provide sufficient attraction to move the brake piston 200 when the magnet 500 and the brake piston 200 are brought sufficiently close to each other. Accordingly, if the linearly movable structure is 300 (e.g.When the spindle nut 305 moves in the brake release direction, the magnet 500, which is arranged between the brake piston 200 and the linearly movable structure 300 (e.g., the spindle nut 305), moves the brake piston 200 towards the linearly movable structure 300 (e.g., the spindle nut 305), thereby retracting the brake piston 200 in the brake release direction. The magnet 500 can be used to actively retract the brake piston 200 if the linearly movable structure 300 (e.g., the spindle nut 305) moves in the brake release direction during the brake release process.

[0041] The magnet 500 may contain one or more magnetic metal elements (e.g., iron, cobalt, nickel, etc.), composite magnets (e.g., ceramic or ferrite magnets, Alnico magnets, Ticonal magnets, injection-molded magnets, flexible magnets), rare-earth magnets (e.g., samarium-cobalt magnets, neodymium-iron-boron magnets, etc.), neodymium magnets, sets of any of these magnets, or any material or composition that generates a magnetic field. The magnet may preferably be a permanent magnet or the like. Alternatively, the magnet 500 may also be an electromagnet. Furthermore, the magnet 500 may be replaced by a magnetized material, such as, among others, an iron-containing material, including iron, cobalt, nickel, steel, rare-earth metals or their alloys, or the like.

[0042] The magnet 500 can be positioned at a location for magnetic interaction with the brake piston 200 or the linearly movable structure 300 (e.g., the spindle nut 305) if the magnet 500 and the brake piston 200 (or the linearly movable structure 300 (e.g., the spindle nut 305)) are in relatively close proximity to each other. The magnet 500 can be attached to different positions of the linearly movable structure 300 (e.g., the spindle nut 305) and / or the brake piston 200. For example, as in the first exemplary embodiment, the magnet 500 can be positioned at the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 is shown, and in the second exemplary embodiment, which is shown in the Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 is shown, in a fixed relationship to the linearly movable structure 300 (e.g. the spindle nut 305), for example by attaching the magnet 500 (e.g. the magnet 500-1 of Fig. 1 to 5 or 500-2 of Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10) at a suitable location on a wall or on another structure of or within the linearly movable structure 300 (e.g., the spindle nut 305). Alternatively, as in the third exemplary embodiment, the Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. As shown in Figure 15, the magnet 500 is arranged in a fixed relationship to the brake piston 200, for example by attaching the magnet 500 (e.g., the magnet 500-3 of Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. 15) at a suitable location on a wall or on another structure of the brake piston 200 or in the brake piston 200. Furthermore, in another exemplary embodiment, the magnet 500 can be attached both to the brake piston 200 and to the linearly movable structure 300 to increase the strength of an attractive force that moves the brake piston 200. FIRST EXAMPLE FORM (FIG. 1 TO 5)

[0043] With reference to the Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. In the first exemplary embodiment, the magnet 500-1 can be attached to the linearly movable structure 300 (e.g., the spindle nut 305) so that the magnet 500-1 can move together with the linearly movable structure 300 (e.g., the spindle nut 305), while the brake piston 200 can have magnetically attractive material that can be attracted by the magnet 500-1. Accordingly, the magnetic attraction between the magnet 500-1 attached to the linearly movable structure 300 and the brake piston 200 with the magnetically attractive material can be generated when the magnet 500-1 and the brake piston 200 are in relative proximity to each other, and therefore the magnet 500-1 attached to the linearly movable structure 300 can attract or pull the brake piston 200 with the magnetically attractive material. The magnetically attractive material of the brake piston 200 can, for example, be used for…The brake piston 200 may contain one or more components of a ferromagnetic material, a paramagnetic material, or a magnetized material. The ferromagnetic material may contain iron, nickel, and cobalt, and their alloys. For example, the brake piston 200 is made of steel (e.g., low-carbon steel). However, the brake piston 200 may comprise or be made of any material that can be magnetically attracted to the magnet 500-1. Furthermore, the brake piston 200 may contain an additional magnet for magnetic interaction with the magnet 500-1.

[0044] In the first exemplary embodiment, the magnet 500-1 can be arranged in an inner groove 510 formed on an inner circumferential surface of the linearly movable structure 300 (e.g., the spindle nut 305). The inner groove 510 is formed, for example, on the head section 310 of the spindle nut 305, or, for example, but not exclusively, on an end section of the spindle nut 305 facing the inner end surface 205 of the brake piston 200. The magnet 500-1 can be pressed into the inner groove 510 of the spindle nut 305. Alternatively, the magnet 500-1 can be attached to the inner groove 510 of the spindle nut 305 using an adhesive, screws, rivets, or other fastening mechanisms.

[0045] The magnet 500-1 can be configured in a hollow cylindrical shape, a ring shape, or a disc shape. The outer or inner circumferential surface of the magnet 500-1 can have at least one circular, square (e.g., square sections, rotary sections, tabular sections, or square rings), or polygonal cross-section, or a combination thereof. However, the magnet 500-1 can have any shape that can fit into the inner groove 510 of the linearly movable structure 300 (e.g., the spindle nut 305), for example, a nut shape. The magnet 500-1 can have a bore 511 in its center, allowing the spindle 405 to be guided through the bore 511 of the magnet 500-1. The free space between the inner surface 501 of the bore 511 of the magnet 500-1 and the outer circumferential surface of the spindle nut 305 is designed such that the magnet 500-1 and the spindle nut 305 cannot come into contact with each other.

[0046] A groove 230, corresponding to the magnet 500-1, which is attached to the inner circumferential surface of the spindle nut 305, can be formed on the inner end wall 205 of the brake piston 200. The magnet 500-1, which is attached to the linearly movable structure 300 (e.g., the spindle nut 305), can be inserted into the groove 230 of the brake piston 200 when the linearly movable structure 300 (e.g., the spindle nut 305) and the brake piston 200 approach each other. A gap or clearance can be present between the outer surface 502 of the magnet 500-1 and an inner circumferential surface 231 of the groove 230 of the brake piston 200.For example, the diameter of the groove 230 in the inner wall 210 of the brake piston 200 is larger than the diameter of the magnet 500-1, which is arranged in the inner groove 510 formed on an inner circumferential surface of the linearly movable structure 300. This allows the magnet 500-1, attached to the linearly movable structure 300, to be inserted into the groove 230 of the brake piston 200 when one of the brake piston 200 and the linearly movable structure 300 approaches the other. The magnet 500-1 can project outwards from the inner groove 510 of the linearly movable structure 300 towards the inner wall 205 of the brake piston 200. An end face 503 of the magnet 500-1 can touch part of the groove 230 of the brake piston 200 when the head section 310 of the spindle nut 305 engages with the inner end face 205 of the brake piston 200.Alternatively, the magnet 500-1 may also fail to touch the brake piston 200 if the head section 310 of the spindle nut 305 engages with the inner surface 205 of the brake piston 200 in order to reduce the noise caused by the contact between the magnet 500-1 and the brake piston 200.

[0047] During operation, when the parking brake is in the brake application position, the brake piston 200 is pressed by the linearly movable structure 300 (e.g., the spindle nut 305) and is in direct or indirect contact with the brake pad assembly 120 to maintain the clamping force of the brake pad assembly 120 against the brake rotor 125. However, when the parking brake release process is initiated, the spindle nut 305 is retracted away from the brake rotor 125 in response to the rotation of the spindle 405 in a brake release direction. This linear movement of the spindle nut 305 in the brake release direction can then cause the inner surface 205 of the brake piston 200 to disengage from the head section 310 of the spindle nut 305, as shown in Fig. 3A and Fig. 3B shown. Then, the brake piston 200 with the magnetically attractive material is drawn towards the linearly movable structure 300 (for example, the spindle nut 305) by the magnetic attraction force generated between the brake piston 200 and the magnet 500-1, which is attached to the linearly movable structure 300, so that the retraction of the brake piston 200 can cause the inner surface 205 of the brake piston 200 to engage with the magnet 500-1 and / or the head section 310 of the spindle nut 305, as shown in Fig. 4A and Fig. As shown in Figure 4B, the brake piston 200 can be retracted together with the linearly movable structure 300 (e.g., the spindle nut 305). Accordingly, after the brake is released, the brake piston 200 is pushed back and retracted by the magnetic attraction generated between the brake piston 200 with the magnetically attractive material and the magnet 500-1 attached to the linearly movable structure 300. Therefore, the magnet 500-1 advantageously assists in retracting the brake piston 200 with the magnetically attractive material, in order to pull the brake piston 200 into a pre-application position and to maintain a constant and repeatable air gap between the brake piston 200 and the brake rotor 125. The magnet 500-1 attached to the linearly movable structure 300 can actively retract the brake piston 200 with the magnetically attractive material when the spindle nut 305 moves in the brake release direction.Brake drag, which is caused by contact forces between the brake pad assembly 120 and the brake rotor 125 due to an insufficient retraction distance of the brake piston 200 during the brake release process, can be prevented, and therefore the retraction of the brake piston is improved. FORM OF EXECUTION NOT PART OF THE INVENTION (FIG. 6 TO 10)

[0048] In the first exemplary embodiment of Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. In the second exemplary embodiment described above, magnet 500-1 is arranged on the inner circumferential surface of the linearly movable structure 300 (e.g., the spindle nut 305). However, a magnet 500-2 can be arranged as in the second exemplary embodiment of Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 shown, on an outer circumferential surface of the linearly movable structure 300 (e.g. the spindle nut 305) instead of the inner circumferential surface of the linearly movable structure 300.

[0049] With reference to Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 In the second exemplary embodiment, the magnet 500-2 can be attached to the linearly movable structure 300 (e.g., the spindle nut 305), while the brake piston 200 can have a magnetically attractive material that can be attracted by the magnet 500-2. Accordingly, the magnetic attraction between the magnet 500-2 attached to the linearly movable structure 300 and the brake piston 200 with the magnetically attractive material can be generated when the magnet 500-2 and the brake piston 200 are in relative proximity to each other, and therefore the magnet 500-2 attached to the linearly movable structure 300 can attract or pull the brake piston 200 with the magnetically attractive material. The magnetically attractive material of the brake piston 200 can, for example, include one or more ferromagnetic materials, paramagnetic materials, or magnetized materials.The ferromagnetic material can contain iron, nickel, and cobalt, and their alloys. For example, brake piston 200 is made of steel (e.g., low-carbon steel). However, brake piston 200 can comprise or be made of any material that can be magnetically attracted to magnet 500-2. Furthermore, brake piston 200 can contain an additional magnet for magnetic interaction with magnet 500-1.

[0050] The magnet 500-2 can be arranged in an outer groove 520 formed on the outer circumferential surface of the linearly movable structure 300 (e.g., the spindle nut 305). The outer groove 520 is formed, for example, on an outer surface of the head section 310 of the spindle nut 305, or, for example, but not exclusively, on an end section of the spindle nut 305 facing the inner end surface 205 of the brake piston 200. The magnet 500-2 can be pressed into the outer groove 520 of the spindle nut 305. Alternatively, the magnet 500-2 can be attached to the outer groove 520 of the spindle nut 305 using an adhesive, screws, rivets, or other fastening mechanisms.

[0051] The magnet 500-2 can be configured in a ring shape, a hollow cylindrical shape, or a disc shape. The outer or inner circumferential surface of the magnet 500-2 can have at least one circular, square (e.g., square sections, rotary sections, tabular sections, or square rings), or polygonal cross-section, or a combination thereof. However, the magnet 500-2 can have any shape that can fit into the outer groove 520 of the linearly movable structure 300 (e.g., the spindle nut 305), for example, a nut shape (e.g., a magnet 500-2 that is inserted into a nut). Fig. 30 is shown).

[0052] A groove 230, corresponding to the magnet 500-2 attached to the outer surface of the spindle nut 305, can be formed on the inner end wall 205 of the brake piston 200. The shape of the groove 230 of the brake piston 200 can be essentially a mirror image of a portion of the magnet 500-2 that can be inserted into the groove 230. The magnet 500-2, which is attached to the linearly movable structure 300 (e.g., the spindle nut 305), can be inserted into the groove 230-2 of the brake piston 200 when the linearly movable structure 300 (e.g., the spindle nut 305) and the brake piston 200 approach each other. A gap or space may exist between the outer surface 502 of the magnet 500-2 and an inner circumferential surface 231 of the groove 230 of the brake piston 200. An end face 503 of the magnet 500-2 may contact part of the groove 230 of the brake piston 200 when the head section 310 of the spindle nut 305 engages with the inner surface 205 of the brake piston 200.Alternatively, the magnet 500-2 may also not touch the brake piston 200 if the head section 310 of the spindle nut 305 engages with the inner surface 205 of the brake piston 200 in order to reduce the noise caused by the contact between the magnet 500-2 and the brake piston 200.

[0053] The operating processes of the second exemplary embodiment of Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 are essentially the same as or similar to those of the first exemplary embodiment of Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5, which is described above, and are therefore not described in detail here. It is understood that processes, functions, structures, and features not related to this second exemplary embodiment, which is described in Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 is shown, are described in the descriptions of the first exemplary embodiment, which is in Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 is shown, can be found. FORM OF EXECUTION NOT PART OF THE INVENTION (FIG. 11 TO 15)

[0054] As described in detail above, both the magnet 500-1 of the first exemplary embodiment of Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 as well as the magnet 500-2 of the second exemplary embodiment of Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 is attached to the linearly movable structure 300 (e.g., the spindle nut 305). In a third exemplary embodiment, however, a magnet 500-3 is attached to the brake piston 200 instead of the linearly movable structure 300.

[0055] With reference to Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. 15 In the third exemplary embodiment, the magnet 500-3 can be attached to the brake piston 200, while the linearly movable structure 300 (e.g., the spindle nut 305) can comprise magnetically attractive material that can be attracted by the magnet 500-3. Accordingly, the magnetic attraction between the magnet 500-3 attached to the brake piston 200 and the linearly movable structure 300 with the magnetically attractive material can be generated when the magnet 500-3 and the linearly movable structure 300 are in relative proximity to each other, and therefore the magnet 500-3 attached to the brake piston 200 can attract the linearly movable structure 300 with the magnetically attractive material. The magnetically attractive material of the linearly movable structure 300 can, for example, include one or more ferromagnetic materials, paramagnetic materials, or magnetized materials.The ferromagnetic material can contain iron, nickel, and cobalt, and their alloys. For example, the linearly movable structure 300 is made of steel (e.g., low-carbon steel). However, the linearly movable structure 300 can comprise or be made of any material that can be magnetically attracted to the magnet 500-3. Furthermore, the linearly movable structure 300 can include an additional magnet for magnetic interaction with the magnet 500-3.

[0056] The magnet 500-3 can be arranged in a groove 240 formed on the inner end wall 205 of the brake piston 200. For example, the groove 240 of the brake piston 200 in which the magnet 500-3 is arranged is formed in the center of the inner end wall 205 of the brake piston 200, facing the head section 310 of the spindle nut 305. The magnet 500-3 can be pressed into the groove 240 of the brake piston 200. Alternatively, the magnet 500-3 can be attached to the groove 240 of the brake piston 200 using an adhesive, screws, rivets, or other fastening mechanisms. The shape of the groove 240 of the brake piston 200 can be essentially a mirror image of a portion of the magnet 500-3 inserted in the groove 240.

[0057] The magnet 500-3 can be in a disc shape, a cylindrical shape, or a ring shape. The outer or inner circumferential surface of the magnet 500-3 can have at least one circular, square (such as square sections, rotary sections, tabular sections, or square rings), or polygonal cross-section, or a combination thereof. However, the magnet 500-3 can have any shape that can be fitted into the groove 240 of the brake piston 200, such as a nut shape. As shown in Fig. 12, Fig. 13, Fig. 14 to Fig. As shown in Figure 15, the magnet 500-3 can have a bore 511 in its center, allowing the spindle 405 to pass through the bore 511 of the magnet 500-3. Alternatively, the magnet 500-3 can be, as shown in Fig. 32, Fig. 33, Fig. 34 to Fig. Figure 35 shows that instead of the bore 511, the surface or groove 512 has a concave surface or groove which can accommodate an end section of the rotatable structure 400 (e.g., the spindle 405), but does not touch the rotatable structure 400.

[0058] A surface 504 of the magnet 500-3, which touches the head section 310 of the spindle nut 305, may be angled or chamfered depending on a curvature of the head section 310 of the spindle nut 305, although this is not required.

[0059] During operation, when the parking brake is in the brake application position, the brake piston 200 is pressed by the linearly movable structure 300 (e.g., the spindle nut 305) and is in direct or indirect contact with the brake pad assembly 120 to maintain the clamping force of the brake pad assembly 120 against the brake rotor 125. However, when the parking brake is released, the spindle nut 305 is retracted away from the brake rotor 125 in response to the rotation of the spindle 405 in a brake release direction, and this linear movement of the spindle nut 305 in the brake release direction can then cause the inner surface 205 of the brake piston 200 to disengage from the head section 310 of the spindle nut 305, as shown in Fig. 13A and Fig. shown in Figure 13B. The brake piston 200 with the magnet 500-3 is then drawn towards the linearly movable structure 300 (e.g., the spindle nut 305) containing the magnetically attractive material by the magnetic attraction generated between the linearly movable structure 300 and the magnet 500-3 attached to the brake piston 200, so that the retraction of the brake piston 200 can cause the inner surface 205 of the brake piston 200 to engage with the magnet 500-3 and / or the head section 310 of the spindle nut 305, as shown in Figure 13B. Fig. 14A and Fig. As shown in Figure 14B, the brake piston 200 can be retracted together with the linearly movable structure 300 (e.g., the spindle nut 305). Accordingly, after the brake is released, the brake piston 200 is pushed back and retracted by the magnetic attraction generated between the magnet 500-3 attached to the brake piston 200 and the linearly movable structure 300 with its magnetically attractive material. Therefore, the magnet 500-3 advantageously assists in retracting the brake piston 200 to pull it into a pre-application position and maintain a constant and repeatable air gap between the brake piston 200 and the brake pad assembly 120. The magnet 500-3 can actively retract the brake piston 200 when the spindle nut 305 is retracted.Brake drag, which is caused by contact forces between the brake pad assembly 120 and the brake rotor 125 due to an insufficient retraction distance of the brake piston 200 during the brake release process, can be prevented, and therefore the brake piston retraction is improved. FORM OF EXECUTION NOT PART OF THE INVENTION (FIG. 16 TO 20)

[0060] In the first to third exemplary embodiments of Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. In the fourth exemplary embodiment of Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. However, 20 is magnetized to one of the brake piston 200 and the linearly movable structure 300, instead of attaching the magnet 500 to one of the brake piston 200 and the linearly movable structure 300 (e.g. the spindle nut 305).

[0061] With reference to Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. In the fourth exemplary embodiment, the linearly movable structure 300 is magnetized, and the brake piston 200 comprises a magnetically attractive material. Therefore, a magnetic attraction between the magnetized linearly movable structure 300 and the brake piston 200 with the magnetically attractive material can be generated when the magnetized linearly movable structure 300 and the brake piston 200 are in relative proximity to each other, and thus the magnetized linearly movable structure 300 can attract or pull the brake piston 200 with the magnetically attractive material. The linearly movable structure 300 can contain or be made of a material that is magnetized and capable of generating its own sustained magnetic field, such as ferromagnetic material.The ferromagnetic material may, for example, contain one or more of iron, cobalt, nickel, and most of their alloys, as well as some rare-earth metal compounds. The processes, functions, structures, and features of the fourth exemplary embodiment are the same or substantially similar to those of the first and second exemplary embodiments described above. Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. Figure 10 shows, except that the magnet 500-1 or 500-2 is omitted by having the magnetized linearly movable structure 300 (e.g. the magnetized spindle nut 305).

[0062] Alternatively, the brake piston 200 is magnetized, and the linearly movable structure 300 comprises a magnetically attractive material. The processes, functions, structures, and features of the alternative exemplary embodiment are the same as, or substantially similar to, the third exemplary embodiment described above. Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. Figure 15 shows, except that the magnet 500-3 is omitted by showing the magnetized brake piston 200.

[0063] Any elements, processes, functions, structures and features not related to the fourth embodiment, which is in Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. The embodiments shown in Figure 20 are described in the descriptions of those embodiments described above, which are found in Figure 20. Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig.5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. 15 are shown. FIFTH TO EIGHTH EXAMPLE OF EXECUTION (FIG. 21 TO 40)

[0064] The first to fourth exemplary embodiments of Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. 20, which is a metal piston brake assembly, can be implemented as a phenol piston brake assembly (e.g., as a phenol MoC (Motor on Caliper) brake assembly). Some exemplary embodiments applied to a phenol piston brake assembly are described in Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40 is shown. For example, the first exemplary embodiment of Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. 5 of the metal piston brake assembly to a fifth exemplary embodiment of Fig. 21, Fig. 22, Fig. 23, Fig. 24 to Fig. 25 of the phenolic piston brake assembly are modified, the second exemplary embodiment of Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. 10 of the metal piston brake assembly to a sixth exemplary embodiment of Fig. 26, Fig. 27, Fig. 28, Fig. 29 to Fig. 30 of the phenolic piston brake assembly are modified, the third exemplary embodiment of Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. 15 of the metal piston brake assembly to a seventh exemplary embodiment of Fig. 31, Fig. 32, Fig. 33, Fig. 34 to Fig. 35 of the phenolic piston brake assembly are modified, and the fourth exemplary embodiment of Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. 20 of the metal piston brake assembly to an eighth exemplary embodiment of Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40 of the phenolic piston brake assembly will be modified. The phenolic piston brake assembly can offer advantages such as relatively low specific weights and relatively low thermal conductivities.

[0065] In the embodiment of the phenolic flask type of Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40. A phenolic outer layer 900 can be applied to the brake piston 200 (e.g., a steel core). The phenolic outer layer 900 can be positioned between the brake piston 200 (e.g., a steel core) and the brake caliper 110. The phenolic outer layer 900 can be applied to the brake piston 200 in a process known as overmolding, although this is not required. The brake piston 200 (i.e., a core) can be made essentially of metal, and the outer layer 900 applied to the brake piston 200 can be made essentially of phenolic material. The phenolic outer layer 900, together with the brake piston 200, can be slidably movable relative to the brake caliper 110.

[0066] The outer layer 900 can be made of a polymer material, such as a thermoset or thermoplastic polymer. Preferred polymer materials may include polymers made from phenolic resins or other suitable polymers with appropriate strength, stiffness, chemical resistance, low compressibility, and temperature resistance for use in the vicinity of a disc brake piston. For example, a polymer with temperature stability up to approximately 150°C, 200°C, 250°C, 300°C, 350°C, or higher may be advantageously incorporated into the design. Suitable polymer materials may be filled, such as with glass fibers, minerals, metal, and / or other materials suitable for the strength, temperature, and durability requirements, or they may be unfilled. Polymer materials may be laminated and / or reinforced as desired.Suitable polymer materials may include those made from phenolic resins, such as novolacs and resoles, and contain cross-linked forms of phenolic resins.

[0067] The magnets 500 (e.g., magnets 500-1 to 500-3), the brake caliper 110, the brake piston 200, the linearly movable structure 300, the rotatable structure 400, the actuator assembly 800 and their parts, components and elements of the fifth to eighth exemplary embodiment of Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40 can be identical or similar to those of the first to fourth exemplary embodiments of Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. 20, which are described above, are constructed. It is understood that structures, features, materials, processes, and functions not specifically related to the fifth to eighth exemplary embodiments of Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40 were discussed, identical or similar to the first to fourth exemplary embodiments of Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. 20 can be. Any elements relating to the fifth to eighth exemplary embodiment of Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40 are not described, but are described in the descriptions of the first to fourth exemplary embodiments of Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. 20, which are described above, can be found. For example, the descriptions for the fifth exemplary embodiment of Fig. 21, Fig. 22, Fig. 23, Fig. 24 to Fig. 25 in descriptions of the first exemplary embodiment of Fig. 1, Fig. 2, Fig. 3, Fig. 4 to Fig. The descriptions for the sixth exemplary embodiment of can be found in section 5. Fig. 26, Fig. 27, Fig. 28, Fig. 29 to Fig. 30 in descriptions of the second exemplary embodiment of Fig. 6, Fig. 7, Fig. 8, Fig. 9 to Fig. The descriptions for the seventh exemplary embodiment of can be found in section 10. Fig. 31, Fig. 32, Fig. 33, Fig. 34 to Fig. 35 in descriptions of the third exemplary embodiment of Fig. 11, Fig. 12, Fig. 13, Fig. 14 to Fig. 15 can be found and are the descriptions for the eighth exemplary embodiment of Fig. 36, Fig. 37, Fig. 38, Fig. 39 to Fig. 40 in descriptions of the fourth exemplary embodiment of Fig. 16, Fig. 17, Fig. 18, Fig. 19 to Fig. 20 to find.

[0068] Although the embodiments have been described in detail, it is understood that various changes, substitutions and modifications may be made without deviating from the scope and nature of the present disclosure as defined by the accompanying claims.

[0069] Furthermore, the scope of the present application is not to be limited to the specific embodiments of the process, machine, manufacture, composition, means, methods, and steps described in the specification. As the person skilled in the art can readily see from the disclosure, processes, machines, manufactures, compositions, means, methods, or steps that currently exist or are subsequently developed and that perform essentially the same function or achieve essentially the same result as the corresponding embodiments described herein may be used in accordance with the embodiments and alternative embodiments. Accordingly, the accompanying claims are intended to include such processes, machines, manufactures, compositions, means, methods, or steps within their scope.

[0070] The explanations and illustrations presented here are intended to familiarize the person skilled in the art with the invention, its principles, and its practical application. The above description is intended to be illustrative and not limiting. The person skilled in the art can adapt and apply the invention in its numerous embodiments in such a way as may be best suited to the requirements of a particular use.

[0071] Accordingly, the specific embodiments of the present invention set forth herein are not intended to be exhaustive or limiting of the teachings. The scope of the teachings should therefore not be determined by reference to this description, but instead by reference to the accompanying claims, together with the full scope of equivalents to which those claims are entitled. The omission of any aspect of subject matter disclosed herein in the following claims shall neither be a waiver of such subject matter, nor should it be construed as an indication that the inventors did not consider such subject matter to be part of the disclosed inventive subject matter.

[0072] Multiple elements or steps can be represented by a single integrated element or step. Alternatively, a single element or step can be divided into multiple separate elements or steps.

[0073] The use of “eine / r / s” or “ein / e” to describe an element or step should not exclude additional elements or steps.

[0074] While the terms first, second, third, etc., can be used here to describe different elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be restricted by these terms. These terms can be used to distinguish one element, component, region, layer, or section from another. Terms such as "first," "second," and other numerical terms, when used here, do not imply any sequence or order unless clearly indicated by the context.Therefore, a first element, a first component, a first region, a first layer or a first section referred to below could be called a second element, a second component, a second region, a second layer or a second section without deviating from the doctrines.

[0075] Spatially relative terms such as "inside," "outside," "under," "below," "below," "above," "above," and the like may be used here to simplify the description and to describe the relationship of one element or feature to another element or elements, or to another feature or features, as illustrated in the figures. Spatially relative terms may be intended to encompass various orientations of the device in use or operation in addition to the orientation shown in the figures. For example, if the device in the figures is upside down, elements described as "under" or "below" other elements or features would then be oriented "above" the other elements or features. Therefore, the exemplary term "below" can encompass both an orientation above and below.The device may be oriented differently (rotated by 90 degrees or in other orientations), and the spatially relative descriptors used here may be interpreted accordingly.

Claims

[1] Brake assembly (10), comprising: a brake piston (200) configured to be movable for a brake application or solution, wherein the brake piston (200) has an inner wall forming a piston cavity (210); a linearly movable structure (300) arranged within the piston cavity (210) of the brake piston (200), wherein the linearly movable structure (300) is configured to be linearly movable within the piston cavity (210) in response to a rotation of a rotatable structure (400) which is operationally coupled to the linearly movable structure (300); and a magnet (500) attached to the linearly movable structure (300) and arranged between the brake piston (200) and the linearly movable structure (300), such that the brake piston (200) is movable towards the linearly movable structure (300) in response to a linear movement of the linearly movable structure (300) by a magnetic field generated by the magnet (500), wherein the brake piston (200) has magnetically attractive material which is designed to attract the magnet (500) so that an attractive magnetic force is generated between the brake piston (200) and the magnet (500) attached to the linearly movable structure (300), wherein the magnet (500) is arranged in an inner groove (510) formed on an inner circumferential surface at an end section of the linearly movable structure (300). [2] Brake assembly (10) according to claim 1, wherein a free space is provided between the magnet (500) attached to the linearly movable structure (300) and the rotatable structure (400) which is operatively coupled to the linearly movable structure (300). [3] Brake assembly (10) according to claim 1, wherein the magnet (500) projects outwards from the inner groove (510) of the linearly movable structure towards the inner wall of the brake piston (200). [4] Brake assembly (10) according to claim 1, wherein the inner wall of the brake piston (200) has a groove (230) into which the magnet (500) attached to the linearly movable structure (300) can be inserted when one or both of the linearly movable structure (300) and the brake piston (200) approach each other. [5] Brake assembly (10) according to claim 4, wherein a free space is provided between an outer circumferential surface of the magnet (500) attached to the linearly movable structure (300) and an inner circumferential surface of the groove (230) of the brake piston (200) into which the magnet (500) attached to the linearly movable structure (300) can be inserted. [6] Brake assembly (10) according to claim 4, wherein a diameter of a groove (230) of the inner wall of the brake piston (200), into which the magnet (500) can be inserted, is larger than the diameter of the magnet (500) which is arranged in an inner groove (510) which is formed on an inner circumferential surface of the linearly movable structure (300). [7] Brake assembly (10) according to claim 1, wherein the magnet (500) has a bore (511) through which the rotatable structure (400) can be passed. [8] Brake assembly (10) according to claim 1 or 2, wherein the magnet (500) attached to the linearly movable structure (300) is configured to attract the brake piston (200) with the magnetically attractive material. [9] Brake assembly (10) according to claim 1 or 2, wherein the magnet (500) has a concave surface configured to receive an end section of the linearly movable structure (300).

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