Abstract: The invention relates to a disc brake, comprising a brake carrier, a brake caliper, brake shoes, and an actuating piston. The brake carrier has at least one mounting point for mounting on a vehicle. The actuating piston is displaceably accommodated on the brake caliper and is actuatable for carrying out a service brake function of the disc brake. At least one further actuating piston is provided, which in the direction of its longitudinal axis is displaceably accommodated on the brake caliper. For carrying out the service brake function, the at least two actuating pistons are actuatable, and for carrying out a parking brake function, one of the actuating pistons is actuatable. The invention further relates to a disc brake system and a parking brake system.

Abstract: A highly reliable vehicle brake system including an electric brake is provided. A vehicle brake system (1) includes electric brakes (16a to 16d) provided with motors (80 to 85), drivers (60 to 65) that drive the motors (80 to 85), and a control device that controls the drivers (60 to 65). The electric brake (16a) includes two motors (80 and 81), and the control device includes separate drivers (60 and 61) respectively corresponding to the two motors (80 and 81). The control device includes a first master controller (30) and a first sub-controller (40). The first master controller (30) controls the driver (61) corresponding to the motor (81), and the first sub-controller (40) controls the driver (60) corresponding to the motor 80.

Abstract: A electromechanical actuator package for actuating a brake assembly may comprise: a motor comprising a motor rotor shaft on which a drive pulley is formed; a multi-stage belt drive mechanism connecting the motor rotor shaft to an actuator output via a plurality of drive belts, the actuator output associated with the brake assembly; a circuit board; and a housing enclosing the motor, the multi-stage belt drive mechanism and the circuit board, wherein the circuit board is positioned between one end of the motor rotor shaft and an inner surface of the housing. The electromechanical actuator package may improve mechanical efficiency as well as reduce the packaging size and mass. Further, the electromechanical actuator package may reduce operational noise.

Abstract: A brake caliper, including a caliper body including a base bearing a piston with a cylindrical external face and a movement conversion mechanism for moving this piston translationally in a main direction, this base including a cylindrical internal face in which the piston slides. The caliper includes three steel rollers interposed between the internal face of the base and the external face of the piston while being oriented along the main axis and distributed about this axis. Each roller is housed in a groove formed at the internal face of the base parallel to the main axis while being open radially towards the main axis, each cylinder extending out of this groove towards the main axis.

Abstract: An electronic parking brake is disclosed. The electronic parking brake includes a spindle unit, a power transmission unit, a first brake unit, and a second brake unit. The spindle presses or releases a piston of a caliper device moving forward or backward toward a wheel disc, toward or from the disc. The power transmission unit transmits received power to the spindle unit. The first brake unit includes a first motor connected to the power transmission so as to generate power needed to brake wheels of a vehicle. The second brake unit includes a second motor connected to the power transmission unit so as to generate power needed to brake the wheels of the vehicle. The second brake unit and the first brake unit are operated independently from each other.

Abstract: An electric parking brake for an automotive vehicle comprises a brake caliper having first and second bores. A first piston is mounted in the first bore and a second piston is mounted in the second bore. A first actuator supports the first piston and a second actuator supports the second piston. The first and second actuators are controlled individually.

Abstract: An assembly that includes a parking brake system including two or more spindle/nut devices. The two or more spindle/nut devices include a high efficiency device and a low efficiency device. The high efficiency device is in communication with a first end of a brake pad, and the low efficiency device in communication with a second end of the brake pad. The high efficiency device moves the first end of the brake pad against a braking surface, and the low efficiency device moves the second end of the brake pad against the braking surface. After one or both of the ends of the brake pad are moved against the braking surface and a clamping force is created, the low efficiency device locks and prevents movement of the high efficiency device so that the clamping force is maintained.

Abstract: An assembly includes a brake system comprising, a parking brake assembly including a first drive shaft and a second drive shaft. The assembly also includes two or more opposing brake pads, and a rotor extending between the two or more opposing brake pads. During use, the first drive shaft is moved so that a first portion of the brake pad is moved relative to the rotor, The second drive shaft is moved so that a second portion of the brake pad is moved relative to the rotor. One of the first portion of the brake pad or the second portion of the brake pad is moved relative to the rotor before the other of the first portion of the brake pad or the second portion of the brake pad is moved relative to the rotor.

Abstract: According to an example, a disk brake is disclosed in which a caliper is supported by a mounting bracket via a slide pin, the mounting bracket being attached to a non-rotational portion of a vehicle, the disk brake comprising an electromagnet provided in connection with the slide pin, the electromagnet attracting the slide pin in an axial direction of the slide pin such that brake pads move away from a disk rotor. According to another example, a disk brake in which a caliper is supported by a mounting bracket via a slide pin, the mounting bracket being attached to a non-rotational portion of a vehicle, the disk brake comprising a magnetic material body of a backing plate of a brake pad and an electromagnet provided in a location where the electromagnet is opposed to the magnetic material body in a lateral direction of the vehicle.

Abstract: A brake system is disclosed, which comprises a parking brake system and an inboard brake pad. The parking brake system includes a first actuator assembly, a second actuator assembly, a motor, and a clutch. The clutch selectively communicates power from the motor to the first actuator assembly so that a first end of the inboard brake pad is moved relative to a brake rotor. The clutch selectively communicates the power from the motor to the second actuator assembly so that a second end of the inboard brake pad is moved relative to the brake rotor. The clutch selectively communicates the power from the motor to both the first actuator assembly and the second actuator assembly so that both the first and the second ends of the inboard brake pad are moved relative to the brake rotor.

Abstract: An assembly includes a brake system comprising a parking brake assembly including a first drive shaft and a second drive shaft. The assembly also includes two or more opposing brake pads, and a rotor extending between the two or more opposing brake pads. During use, the first drive shaft is moved so that a first portion of the brake pad is moved relative to the rotor, The second this shaft is moved so that a second portion of the brake pad is moved relative to the rotor. One of the first portion of the brake pad or the second portion of the brake pad is moved relative to the rotor before the other of the first portion of the brake pad or the second portion of the brake pad is moved relative to the rotor.

Abstract: A motor for actuating brake members of an electric parking (EPB) system, includes a stator and a rotor rotatably mounted to the stator. The rotor has a shaft, a commutator, a rotor core fixed to the shaft, and rotor windings wound about teeth of the rotor core and electrically connected to segments of the commutator. The rotor windings have a plurality of winding units and each of the winding units have at least two coils. The coils of each winding unit are wound about the same teeth and are connected to a same pair of segments.

Abstract: The invention relates to a hydraulic brake system comprising a master brake cylinder the at least one working chamber of which is connected to the wheel brakes of the vehicle via at least one hydraulic line, the brake piston of at least one wheel brake being adjustable by a negative pressure in the hydraulic lines to produce a brake clearance.

Abstract: The present invention relates to a self-amplifying electromechanical partial lining disc brake, having a ramp mechanism as a self-amplification device. According to the invention, a rack for driving a friction brake pad is situated between roller elements of the ramp mechanism, particularly at a geometrical centroid of an imaginary surface defined by the roller elements. As a result a load is distributed to the roller elements in a more uniform fashion and the pressing force of the friction brake pad against a brake disc when the partial lining disc brake is actuated is distributed more uniformly and counteracts irregular pad wear.

Abstract: In a method for controlling an electronic parking brake system and an electronic parking brake system, a travel-optimized method is used to achieve the released state of the parking brake system. When the parking brake is applied, travel-force values are detected and a plausibility check is run, the values being used to arrive at a first optimized position when the brake is released. If the residual force applied to the brake exceeds a threshold value, the parking brake is released even more until the value remains just under the threshold value or until a maximum defined release travel is achieved.

Abstract: Cut-in-cut-out valves for hydraulic circuits. The hydraulic circuits include a hydraulic pump outputting a variable pressure controlled by a slaving line, an accumulation circuit, a return line to the reservoir, a cut in-cut-out valve. The hydraulic circuits also include a cut-in-cut-out valve having four orifices, a first orifice connected to the supply line, a second orifice connected to the slaving line, a third orifice connected to the return line leading to the reservoir, and a fourth orifice connected to the accumulation circuit. The cut-in-cut-out valve alternates between two positions as a function of the pressure in the accumulation circuit, a cut-in position in which the first, second and fourth orifices are connected to each other, and a cut-out position in which the first and fourth orifices are closed.

Abstract: The invention relates to a brake device for braking a moving brake body (2) by means of pressing a brake element (3, 4) onto the brake body (2), wherein a conversion device (7) is provided for converting a rotational movement of a brake drive shaft (9) into a translational movement of the brake element (4) in the direction of the brake body (2), wherein a rotary percussion mechanism (8) is connected between the brake drive shaft (9) and the conversion device (7).

Abstract: The invention relates to an electric parking brake, comprising a motor-gearing unit (2) with a drive output shaft (3), wherein the motor-gearing unit (2) generates a rotation of the drive output shaft (3), and comprising a spindle device (4) having a spindle (5) and a nut (6), wherein the spindle device (4) converts the rotation of the drive output shaft (3) into an axial movement of the nut (6) in the axial direction (X-X), wherein the spindle (5) is connected in a positively locking manner to the drive output shaft (3), the spindle (5) is centered on the drive output shaft (3), and the spindle is mounted in a brake caliper (7).

Abstract: Provided is an electric brake capable of accurately estimating the brake pad temperature and securing a sufficient braking force and response. An electric brake has a disc rotor rotating with a wheel, an actuator for rectilinearly actuating a piston in the axial direction of the disc rotor by using an electric motor, a drive controller for controlling the drive of the actuator, a brake pad pressed by the piston to give a frictional resistance to the disc rotor in the direction of rotation, and a braking start position detector for detecting a braking start position of the piston where the disc rotor is brought into contact with the brake pad. The drive controller stores the braking start position detected by the braking start position detector as the maximum braking start position. When the braking start position shifts in the pressing force-increasing direction, the drive controller updates the value stored as the maximum braking-start position.

Abstract: An electric brake device comprises a caliper holding braking members and having an electric motor attached thereto, a reduction mechanism for transmitting an input rotation of one input element thereof from the electric motor to two output elements thereof at reduced speeds, a rotation-linear motion converting mechanism for converting the rotation of one of the output elements into a linear motion of one of the braking members, and a thrust force support member connected to the other output element and screw-engaged with the caliper, wherein the rotation-linear motion converting mechanism is supported by the thrust force support member to be movable together in a thrust direction and is provided with rotation limiting portions for limiting the rotation in a reverse direction of the one output element to a predetermined range, and wherein the thrust force support member is set to be greater in resistance to operation than the rotation-linear motion converting mechanism.

Abstract: An electric brake has a master cylinder (12) including pistons (22, 24) for rear and front brake circuits and an electric motor (50) for actuating the rear brake piston (22). A feedback circuit provides a signal indicative of the fluid pressure supplied to the rear brake circuit and is operable in response to driver commanded braking force (48) to supply fluid pressure to the rear wheel brake circuit. A mechanical coupling (44, 46) between the second piston and a brake pedal is responsive to driver applied brake pedal force to supply fluid pressure to the front wheel brake circuit. A fluid circuit (30, 82) utilizes the fluid pressure supplied to the rear wheel brake circuit to augment driver applied brake pedal force thereby supplying power boosted fluid pressure to the front wheel brake circuit.

Abstract: The invention relates to an electromechanical disk brake which has a switchable freewheel in order to be configured as a parking brake. The switchable freewheel includes a clamping roller freewheel having rollers for locking a motor shaft of an electric motor of the brake. A locating bearing of the motor shaft of an electric motor, and the freewheel are accommodated on a cover of a housing of the electric motor, and all the electric connections of the disc brake are routed via the cover. The number of components used can be reduced considerably by the integrated design. Moreover, the positional tolerances of the freewheel in relation to the motor shaft can be reduced with the aid of the invention.

Abstract: The invention provides a brake apparatus in which a vibration resistance and a heat resistance are improved, in a control apparatus of an integrally structured brake in which an electric circuit portion is attached to a brake force generating portion of the brake apparatus. In the control apparatus of the integrally structured brake in which the electric circuit portion is attached to the brake force generating portion of the brake apparatus, the structure is made such that an opening is provided in a circuit side case and a connected portion is arranged in a space within the opening, in order to secure an assured electric connection after attaching the circuit portion. A connecting work can be executed from the opening portion, a vibration resistance can be improved, and a heat resistance can be improved.

Abstract: In a vehicle disk brake, a motor housing houses in a housing recess a case into which an end of an output shaft liquid-tightly protrudes, and is mounted to a caliper body. A reduction mechanism having an output rotating member is sealed in the case while part of the output rotating member fluid-tightly protrudes from the case so as to be coaxially and operatively connected to a rear portion of the screw shaft. Grease is charged into the case. Thus, the case for housing the reduction mechanism is simply configured while preventing leakage of the grease charged into the case, and mounting of the case to the caliper body is facilitated.

Abstract: During the standstill state maintenance control executed by an electric parking brake system, the moving force-based target tension Frefb is determined based on the inclination angle of a vehicle and the shift position each time the predetermined program is executed, and the tentative target tension Fref(n) in the current routine is set to a smaller value from among the moving force-based target tension Frefb and the maximum value Fmax. The control target tension Fref(n)* is set to a larger value from among the control target tension (the final target tension) Fref(n?1)* in the immediately preceding routine and the tentative target value Fref(n). Even if the tentative target tension Fref(n) is smaller than the control target tension Fref(n?1)*, the control target value Fref(n)* is not set to a value smaller than the control target tension Fref(n?1)*.

Abstract: Pistons 3 and 7 are pressed to a friction member 11 at two points that are positioned at a rotating-in side and a rotating-out side in a rotating direction of a brake rotor 10. An axial force control is performed for the piston 3 on the rotating-out side, and a position control based on the position of the piston 3 on the rotating-out side is performed for the piston 7 on the rotating-in side.

Abstract: An active break release device externally attached to a door controller. The door controller includes a housing for receiving a first motor which rotates a rotary shaft to reel the door; a braking device installed around the periphery of the rotary shaft. The active break release device comprises: at least a brake releasing rod, one end of which is to activate the braking device while the other end of which extends to the outside of the door controller; at least a second motor, for moving the other end of the brake releasing rod; a circuit having a backup power source used to temperately supply electricity to the second motor if electricity fails, so that the one end releases the braking.

Abstract: A motor and brake assembly having a disengaging mechanism for use with RV's are disclosed. The assembly includes a motor and a disengaging mechanism that is mounted thereon. The disengaging mechanism includes a motor mount comprised of a cylindrical piece with a plurality of holes disposed on the periphery of an outer flange of the cylindrical piece. The cylindrical piece extends over the barrel of the motor and is secured to the barrel with a plurality of screws. Through manipulation of the cylindrical piece, the user can selectively engage or disengage the brake from the motor.

Abstract: An electric brake actuator for the brake system of an aircraft is presented. A brake actuator includes a piston driven by a cylindrical nut and screw arrangement, driven by an appropriate motor of the actuator. Application of brake force results in a reactionary force that deflects the top cover of the actuator. The axial component of this deflection correlates directly with the brake force applied. A beam is interposed between this cover and a top cap, such that deflection of the beam correlates to applied brake face. Piezo-resistive devices are connected to the beam and, through a whetstone bridge, provide an electrical output signal correlating to applied brake force.

Abstract: The invention relates to an electromechanical disk brake which has a switchable freewheel in order to be configured as a parking brake. The switchable freewheel includes a clamping roller freewheel having rollers for locking a motor shaft of an electric motor of the brake. A locating bearing of the motor shaft of an electric motor, and the freewheel are accommodated on a cover of a housing of the electric motor, and all the electric connections of the disc brake are routed via the cover. The number of components used can be reduced considerably by the integrated design. Moreover, the positional tolerances of the freewheel in relation to the motor shaft can be reduced with the aid of the invention.

Abstract: The present invention concerns a brake system creating redundancy in electromechanical brakes. At least two drive units are provided at each single brake for activation of the brake. The at least two units may be controlled and/or energized separately. To safeguard the function the control and/or energy source systems are formed in two nets. The at least two units of each brake are connected to separate nets. The at least two units may be separate electrical motors.

Abstract: A brake assembly including a brake pad; a selectively movable rotor, a backing plate which is coupled to the brake pad, at least a first roller which is coupled to the backing plate, a caliper, at least a second roller which is coupled to the caliper, a wedge member which is positioned between and which engages the at least first and the at least second roller, and a motor which is coupled to the wedge member and which selectively moves the wedge member, effective to brake a selectively movable assembly.

Abstract: The present invention relates to a method for establishing the relationship between actuator position and actuator clamping force as well as a control system for applying defined actuator clamping forces to a brake operated electrically using an actuator. The method according to the present invention makes it possible to determine the initially unknown relationship between actuator position and actuator clamping force in real time without using any force sensor at all.

Abstract: An electric brake actuator (14), including a rotatable member (21) and electric drive means (34) for driving the rotatable member (21) to rotate. The rotatable member (21) is arranged for engagement with a continuous cable (18) that in use extends between and in connection with a pair of brake assemblies (12) that are operable when actuated to apply a braking load to brake a wheel associated with each respective brake assembly. The rotatable member (21) is arranged such that it is operable to pull the cable (18) on each side of the rotatable member (21) upon rotation of the rotatable member (21) in a first direction, for actuation of the brake assemblies (12), and to extend the cable (18) on each side of the rotatable member (21) upon rotation of the rotatable member (21) in a second and reverse direction.

Abstract: A compact drive unit for actuating parking brakes is provided. The drive unit has a reduction gear that is formed by a two-stage belt drive, in combination with a drive motor that is made up of a brushless direct current motor. The two-stage belt drive preferably consists of two toothed belt drives functionally arranged in series; the direct current motor preferably has an external rotor with a rare-earth magnetic ring.

Abstract: A braking system for electric vehicles that gives a driver the feel of a conventional hydraulic braking system while maximizing the recuperation of electrical power is described herein. A single brake pedal is used to control both electric and hydraulic braking assemblies. A feedback force generator is provided to give the driver the impression that a completely hydraulic braking system is used. Therefore, the driver is not inclined to further depress the pedal, thereby preventing the premature activation of the hydraulic braking system.

Abstract: An electrical vehicle parking brake device capable of reducing the size towards a cable shaft and improving the degree of freedom of mounting in a vehicle is provided for the electrical vehicle parking brake device of controlling the braking force to a wheel due to the driving power of a motor which is transmitted by way of a cable at the time of parking the vehicle.

Abstract: An actuator comprises a housing, a motor (5), an actuating member (11, 12) and a screw mechanism (2) providing a linear movement of the actuating member (11, 12) with respect to the housing in response to a rotational movement of the motor (5), which screw mechanism (2) comprises a screw (17, 47) and a nut (13, 46) one of which is rotatably supported with respect to the housing by means of an angular contact bearing, and a reduction gear means (4). The actuating member (11, 12) and the reduction gear means (4) are situated at opposite ends of the screw mechanism (2).

Abstract: An electric mechanical brake assembly includes a brake caliper housing, a ballscrew subassembly at least partially located within the housing, first and second electric motors, and at least three gears. A linearly-movable member of the ballscrew subassembly is attachable to a brake pad and is driven by a rotatable actuation shaft of the ballscrew subassembly. The gears operatively connect the drive shafts of the electric motors to the actuation shaft of the ballscrew subassembly. An electric-mechanical-brake motor subassembly includes first and second electric motors, a motor plate, and at least three gears. The electric motors are attached to the motor plate, and the motor plate is attachable to a brake caliper housing. The gears are operatively connectable to the motor drive shafts and to a rotatable actuation shaft, of a ballscrew subassembly at least partially located within the housing, for the drive shafts to rotate the actuation shaft.

Abstract: A brake caliper comprises a motor having a shaft, at least one first planetary gear, and at least one second planetary gear. The at least one first planetary gear is rotatably engaged with the shaft and with a piston, and is operatively engaged with a first carrier. The at least one second planetary gear is operatively engaged with the first stage carrier and with a second carrier. A ball screw is engaged with the second stage carrier for rotation therewith, and a ball screw nut is operatively engaged with the ball screw. A parking brake for the caliper is also provided.

Abstract: An anti-skid control system for an automotive vehicle includes a hydraulic modulator having electromagnetic solenoid valves for regulating a wheel-brake cylinder pressure at each of road wheels. A skid control unit prevents a wheel lock-up condition by controlling the wheel-brake cylinder pressure via on/off reaction of the solenoid valves in response to a pulse signal based on a wheel speed detected by a wheel speed sensor. The skid control unit has a data processing section that generates a desired wheel speed based on the wheel speed, calculates a desired brake-fluid pressure based on an integrated value of a wheel-speed deviation between the desired wheel speed and the wheel speed, sets a controlled ON pulse width based on the desired brake-fluid pressure, and outputting the pulse signal having the controlled pulse width to the solenoid valves after a lapse of a preset pulse width from a previous pulse signal output.

Abstract: While a regulation gear is positioned in a disengaged position where the regulation gear is disengaged from a pinion of a driving motor during running of a vehicle, a controller continuously applies a small holding voltage to a switching motor that drives the regulation gear to prevent engagement of the regulation gear with the pinion. The holding voltage is chosen to be relatively small, but enough to prevent engagement of the regulation gear with the pinion upon application of vibrations or shocks encountered during running of the vehicle.

Abstract: An electrical feedback fashion brake arrester is provided with a motor movement automatic detecting and differentiating device that is mounted in the control loop of the electrical feedback fashion brake arrester. The motor movement automatic detecting and differentiating device receives the existing stroke position feedback signal, determines whether the brake members are in locking configuration, and determines whether the duty cycle and the current of the driving motor should be limited. Hence, the current that is output when the motor is at rest does not exceed that of the maximum sustainable torque force so that the electrical arrester is prevented from being damaged.

Abstract: The invention relates to a disc brake to be opened by torque, the disc brake being arranged between a drive shaft (3) and a driven shaft (11) and comprising a brake wheel (12) arranged on the driven shaft (3) non-rotatably in the peripheral direction; a friction surface (15) arranged to cooperate with the brake wheel (12); a spring device (14) arranged to press the brake wheel (12) axially against the friction surface (15) and means (19 to 21) causing, by the action of the torque and torsion of the drive shaft (3) and a possible counter-torque of the driven shaft (11), the brake wheel (12) and the friction surface (15) to drift axially apart and, accordingly, the braking coupling between them to loosen against the spring force of the spring device (14), whereby the drive shaft (3) and the driven shaft (11) are interconnected in such a way that they may turn a restricted rotational angle with respect to each other and that means for causing said axial displacement and for loosening the braking coupling compris

Abstract: The inventive bearing arrangement for a device for activating a vehicle brake has a central threaded spindle (2) which is secured against torsion in a fixed housing (1) and which is arranged in such a way that it can be displaced up to a brake disk (3) of the vehicle and from thereon axially. The inventive arrangement is also provided with an inner ring (5) which concentrically surrounds the threaded spindle (2) together with roll bodies. Said inner ring (5) is coupled with a rotating rotor of an electromotor (7) at the front and is supported with the same in the housing (1) by an axial roller bearing and a radial roller bearing so that it can rotate. According to the invention, the axial roller bearing of the inner ring (5) is made up of a planetary gear with several roll bodies serving as planets. Said roll bodies are situated between the inner ring (5) and a bore wall (8) of the housing (1) which is axial to the inner ring (5). This reduces the friction losses of the axial roller bearing.

Abstract: A motor-driven brake apparatus has a motor and a ball screw that converts rotational motion of the motor into rectilinear motion of a screw member. A position detector detects a stroke position of the screw member. A controller controls the motor on the basis of the result of detection by the position detector. The controller controls the motor so as to change the clearance between an inner pad (outer pad) and a disk according to vehicle running conditions.

Abstract: The present invention discloses an electromechanically operable disc brake for automotive vehicles which comprises a floating caliper as well as an actuating unit arranged on the caliper. The actuating unit includes an electric motor which, by the intermediary of a reduction gear, readjusts an actuating element which is used to move one of two friction linings that are slidable in the brake caliper into engagement with a brake disc. To permit an individual adjustment of the desired brake force, especially for use of the disc brake in an automotive vehicle, according to the present invention, a force-measuring device (23) is interposed in the flux of force between the caliper (1) and the actuating unit (2), and the output signals of device (23) are adapted to be sent to a control circuit (26) that influences the current supplied to the electric motor (6), and/or the voltage.

Abstract: The invention concerns an electromechanical brake, in particular a disc brake (10), comprising a brake pad (14) which can be urged against a brake disc (16) by means of an electromotive actuating arrangement (18). According to the invention, in order to be able to release the brake (10) in the event of an electronic component failing, for example, a releasable support device (42) supports the actuating arrangement (18) on a brake calliper (12) when the brake pad (14) is urged against the brake disc (16). In order to release the support device (42), its distance from the brake disc (16) is increased such that the actuating arrangement (18) and together therewith the brake pad (14) are released from the brake disc (16).

Abstract: An electrically operated brake for braking a moving body, including two electric motors and a planetary gear device having a sun gear, at least one planetary gear and a ring gear, wherein the two electric motors are connected to two members of the planetary gear device and the third member of the planetary gear device rotates an output shaft which operates a friction member driving device to move a friction member for braking the moving body.

Abstract: A power-assisted hand brake for motor vehicles, which can be operated in an automatic and power-assisted mode with the aid of an electric motor. If the power assisted brake fails, a conventional parking brake is operated mechanically to apply emergency brakes. The handbrake includes a rotatable spindle with a threaded nut thereon which operates the brake by use of the motor. A carrier plate and pivot plates function to disconnect the nut so that a hand-operated lever can be used to manually operate the brake.